AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/07/09 06:57	flow	patch-triage	8m Args: null Results: { "EnableConfigs": [ "IP_VS", "IP_VS_PROTO_TCP", "IP_VS_PROTO_UDP", "IP_VS_PROTO_SCTP", "NF_FLOW_TABLE", "BRIDGE_NF_EBTABLES", "IP_SET", "IP_SET_HASH_IP", "NETFILTER_NETLINK_LOG", "NETFILTER_NETLINK_QUEUE", "NF_TABLES", "NETFILTER_XT_MATCH_U32", "NF_DEFRAG_IPV6" ], "FocusSymbols": [ "ip_vs_in_icmp", "sctp_state_transition", "tcp_state_transition", "udp_state_transition", "flow_offload_route_init", "nf_flow_offload_ip_hook", "nf_flow_offload_ipv6_hook", "nf_flow_offload_add", "nf_flow_offload_refresh", "ebt_check_entry", "do_ebt_set_ctl", "compat_do_replace", "nf_ct_frag6_gather", "hash_ip4_gc", "hash_ip4_resize", "hash_ip4_add", "hash_ip4_del", "hash_ip6_gc", "hash_ip6_resize", "hash_ip6_add", "hash_ip6_del", "nfulnl_log_packet", "nfqnl_build_packet_message", "nft_lookup_eval", "u32_mt" ], "Reasoning": "The patch contains functional changes to various netfilter and ipvs components, fixing potential out-of-bounds reads, incorrect header length calculations, and synchronization issues. It modifies reachable core kernel logic and should be fuzzed.", "WorthFuzzing": true }
1/1	2026/07/09 06:57	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit d172f8e019d60662a8e73adbe4a86161cec84419\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Thu Jul 9 06:57:34 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/include/net/ip_vs.h b/include/net/ip_vs.h\nindex 49297fec448a82..417ff51f62fc8e 100644\n--- a/include/net/ip_vs.h\n+++ b/include/net/ip_vs.h\n@@ -752,7 +752,8 @@ struct ip_vs_protocol {\n \n \tvoid (state_transition)(struct ip_vs_conn cp, int direction,\n \t\t\t\t const struct sk_buff skb,\n-\t\t\t\t struct ip_vs_proto_data pd);\n+\t\t\t\t struct ip_vs_proto_data pd,\n+\t\t\t\t unsigned int iph_len);\n \n \tint (register_app)(struct netns_ipvs ipvs, struct ip_vs_app inc);\n \ndiff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h\nindex 7b23b245a5a86a..ce414118962f54 100644\n--- a/include/net/netfilter/nf_flow_table.h\n+++ b/include/net/netfilter/nf_flow_table.h\n@@ -155,11 +155,12 @@ struct flow_offload_tuple {\n \t\t\t\t\ttun_num:2,\n \t\t\t\t\tin_vlan_ingress:2;\n \tu16\t\t\t\tmtu;\n+\tu32\t\t\t\tdst_cookie;\n+\tstruct dst_entry\t\tdst_cache;\n+\n \tunion {\n \t\tstruct {\n-\t\t\tstruct dst_entry dst_cache;\n \t\t\tu32\t\tifidx;\n-\t\t\tu32\t\tdst_cookie;\n \t\t};\n \t\tstruct {\n \t\t\tu32\t\tifidx;\n@@ -357,6 +358,8 @@ static inline int nf_flow_register_bpf(void)\n \n void nf_flow_offload_add(struct nf_flowtable flowtable,\n \t\t\t struct flow_offload flow);\n+void nf_flow_offload_refresh(struct nf_flowtable flowtable,\n+\t\t\t struct flow_offload flow);\n void nf_flow_offload_del(struct nf_flowtable flowtable,\n \t\t\t struct flow_offload flow);\n void nf_flow_offload_stats(struct nf_flowtable flowtable,\ndiff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c\nindex f20c039e44c8d7..96c9a8f57c8702 100644\n--- a/net/bridge/netfilter/ebtables.c\n+++ b/net/bridge/netfilter/ebtables.c\n@@ -403,6 +403,9 @@ ebt_check_match(struct ebt_entry_match m, struct xt_mtchk_param par,\n \t left - sizeof(struct ebt_entry_match) \u003c m-\u003ematch_size)\n \t\treturn -EINVAL;\n \n+\tif (strnlen(m-\u003eu.name, XT_EXTENSION_MAXNAMELEN) == XT_EXTENSION_MAXNAMELEN)\n+\t\treturn -EINVAL;\n+\n \tmatch = xt_find_match(NFPROTO_BRIDGE, m-\u003eu.name, m-\u003eu.revision);\n \tif (IS_ERR(match) \|\| match-\u003efamily != NFPROTO_BRIDGE) {\n \t\tif (!IS_ERR(match))\n@@ -921,8 +924,7 @@ static int translate_table(struct net net, const char name,\n \t\t if an error occurs\n \t\t /\n \t\tnewinfo-\u003echainstack =\n-\t\t\tvmalloc_array(nr_cpu_ids,\n-\t\t\t\t sizeof((newinfo-\u003echainstack)));\n+\t\t\tvcalloc(nr_cpu_ids, sizeof((newinfo-\u003echainstack)));\n \t\tif (!newinfo-\u003echainstack)\n \t\t\treturn -ENOMEM;\n \t\tfor_each_possible_cpu(i) {\n@@ -1434,6 +1436,8 @@ static int update_counters(struct net net, sockptr_t arg, unsigned int len)\n \tif (copy_from_sockptr(\u0026hlp, arg, sizeof(hlp)))\n \t\treturn -EFAULT;\n \n+\thlp.name[sizeof(hlp.name) - 1] = '\\0';\n+\n \tif (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))\n \t\treturn -EINVAL;\n \n@@ -2273,6 +2277,8 @@ static int compat_copy_ebt_replace_from_user(struct ebt_replace repl,\n \n \tmemcpy(repl, \u0026tmp, offsetof(struct ebt_replace, hook_entry));\n \n+\trepl-\u003ename[sizeof(repl-\u003ename) - 1] = '\\0';\n+\n \t/ starting with hook_entry, 32 vs. 64 bit structures are different /\n \tfor (i = 0; i \u003c NF_BR_NUMHOOKS; i++)\n \t\trepl-\u003ehook_entry[i] = compat_ptr(tmp.hook_entry[i]);\n@@ -2395,6 +2401,8 @@ static int compat_update_counters(struct net net, sockptr_t arg,\n \tif (copy_from_sockptr(\u0026hlp, arg, sizeof(hlp)))\n \t\treturn -EFAULT;\n \n+\thlp.name[sizeof(hlp.name) - 1] = '\\0';\n+\n \t/* try real handler in case userland supplied needed padding /\n \tif (len != sizeof(hlp) + hlp.num_counters sizeof(struct ebt_counter))\n \t\treturn update_counters(net, arg, len);\ndiff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c\nindex 64ab23ff559bb9..599c49bf0a0afd 100644\n--- a/net/ipv6/netfilter/nf_conntrack_reasm.c\n+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c\n@@ -348,7 +348,8 @@ static int nf_ct_frag6_reasm(struct frag_queue fq, struct sk_buff skb,\n \tskb_network_header(skb)[fq-\u003enhoffset] = skb_transport_header(skb)[0];\n \tmemmove(skb-\u003ehead + sizeof(struct frag_hdr), skb-\u003ehead,\n \t\t(skb-\u003edata - skb-\u003ehead) - sizeof(struct frag_hdr));\n-\tskb-\u003emac_header += sizeof(struct frag_hdr);\n+\tif (skb_mac_header_was_set(skb))\n+\t\tskb-\u003emac_header += sizeof(struct frag_hdr);\n \tskb-\u003enetwork_header += sizeof(struct frag_hdr);\n \n \tskb_reset_transport_header(skb);\n@@ -418,7 +419,7 @@ find_prev_fhdr(struct sk_buff skb, u8 prevhdrp, int prevhoff, int fhoff)\n \t\t\treturn -1;\n \t\t}\n \t\tif (skb_copy_bits(skb, start, \u0026hdr, sizeof(hdr)))\n-\t\t\tBUG();\n+\t\t\treturn -1;\n \t\tif (nexthdr == NEXTHDR_AUTH)\n \t\t\thdrlen = ipv6_authlen(\u0026hdr);\n \t\telse\ndiff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h\nindex dedf59b661ddf3..8231317b0f1f4b 100644\n--- a/net/netfilter/ipset/ip_set_hash_gen.h\n+++ b/net/netfilter/ipset/ip_set_hash_gen.h\n@@ -75,15 +75,17 @@ struct hbucket {\n struct htable_gc {\n \tstruct delayed_work dwork;\n \tstruct ip_set set;\t/ Set the gc belongs to /\n+\tspinlock_t lock;\t/ Lock to exclude gc and resize /\n \tu32 region;\t\t/ Last gc run position /\n };\n \n / The hash table: the table size stored here in order to make resizing easy /\n struct htable {\n-\tatomic_t ref;\t\t/ References for resizing /\n+\tbool resizing;\t\t/ Mark ongoing resize /\n \tatomic_t uref;\t\t/ References for dumping and gc /\n \tu8 htable_bits;\t\t/ size of hash table == 2^htable_bits /\n \tu32 maxelem;\t\t/ Maxelem per region /\n+\tstruct list_head ad;\t/ Resize add\|del backlist /\n \tstruct ip_set_region hregion;\t/* Region locks and ext sizes /\n \tstruct hbucket __rcu bucket[]; /* hashtable buckets /\n };\n@@ -301,11 +303,13 @@ struct htype {\n \tu8 netmask;\t\t/ netmask value for subnets to store /\n \tunion nf_inet_addr bitmask;\t/ stores bitmask /\n #endif\n-\tstruct list_head ad;\t/ Resize add\|del backlist /\n-\tstruct mtype_elem next; / temporary storage for uadd /\n #ifdef IP_SET_HASH_WITH_NETS\n \tstruct net_prefixes nets[NLEN]; / book-keeping of prefixes /\n #endif\n+\t/ Because 'next' is IPv4/IPv6 dependent, no elements of this\n+\t * structure and referred in create() may come after 'next'.\n+\t /\n+\tstruct mtype_elem next; / temporary storage for uadd /\n };\n \n / ADD\|DEL entries saved during resize /\n@@ -451,13 +455,14 @@ static void\n mtype_destroy(struct ip_set set)\n {\n \tstruct htype h = set-\u003edata;\n+\tstruct htable t = (__force struct htable )h-\u003etable;\n \tstruct list_head l, lt;\n \n-\tmtype_ahash_destroy(set, (__force struct htable )h-\u003etable, true);\n-\tlist_for_each_safe(l, lt, \u0026h-\u003ead) {\n+\tlist_for_each_safe(l, lt, \u0026t-\u003ead) {\n \t\tlist_del(l);\n \t\tkfree(l);\n \t}\n+\tmtype_ahash_destroy(set, t, true);\n \tkfree(h);\n \n \tset-\u003edata = NULL;\n@@ -569,9 +574,10 @@ mtype_gc(struct work_struct work)\n \tset = gc-\u003eset;\n \th = set-\u003edata;\n \n-\tspin_lock_bh(\u0026set-\u003elock);\n-\tt = ipset_dereference_set(h-\u003etable, set);\n+\trcu_read_lock_bh();\n+\tt = rcu_dereference_bh(h-\u003etable);\n \tatomic_inc(\u0026t-\u003euref);\n+\trcu_read_unlock_bh();\n \tnumof_locks = ahash_numof_locks(t-\u003ehtable_bits);\n \tr = gc-\u003eregion++;\n \tif (r \u003e= numof_locks) {\n@@ -580,11 +586,13 @@ mtype_gc(struct work_struct work)\n \tnext_run = (IPSET_GC_PERIOD(set-\u003etimeout) * HZ) / numof_locks;\n \tif (next_run \u003c HZ/10)\n \t\tnext_run = HZ/10;\n-\tspin_unlock_bh(\u0026set-\u003elock);\n \n-\tmtype_gc_do(set, h, t, r);\n+\tspin_lock_bh(\u0026gc-\u003elock);\n+\tif (!t-\u003eresizing)\n+\t\tmtype_gc_do(set, h, t, r);\n+\tspin_unlock_bh(\u0026gc-\u003elock);\n \n-\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 atomic_read(\u0026t-\u003eref)) {\n+\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 t-\u003eresizing) {\n \t\tpr_debug(\"Table destroy after resize by expire: %p\\n\", t);\n \t\tmtype_ahash_destroy(set, t, false);\n \t}\n@@ -668,15 +676,18 @@ mtype_resize(struct ip_set set, bool retried)\n \t}\n \tt-\u003ehtable_bits = htable_bits;\n \tt-\u003emaxelem = h-\u003emaxelem / ahash_numof_locks(htable_bits);\n+\tINIT_LIST_HEAD(\u0026t-\u003ead);\n \tfor (i = 0; i \u003c ahash_numof_locks(htable_bits); i++)\n \t\tspin_lock_init(\u0026t-\u003ehregion[i].lock);\n \n \t/ There can't be another parallel resizing,\n-\t * but dumping, gc, kernel side add/del are possible\n+\t * but dumping and kernel side add/del are possible\n \t /\n \torig = ipset_dereference_bh_nfnl(h-\u003etable);\n-\tatomic_set(\u0026orig-\u003eref, 1);\n \tatomic_inc(\u0026orig-\u003euref);\n+\tspin_lock_bh(\u0026h-\u003egc.lock);\n+\torig-\u003eresizing = true;\n+\tspin_unlock_bh(\u0026h-\u003egc.lock);\n \tpr_debug(\"attempt to resize set %s from %u to %u, t %p\\n\",\n \t\t set-\u003ename, orig-\u003ehtable_bits, htable_bits, orig);\n \tfor (r = 0; r \u003c ahash_numof_locks(orig-\u003ehtable_bits); r++) {\n@@ -768,7 +779,7 @@ mtype_resize(struct ip_set set, bool retried)\n \t * Kernel-side add cannot trigger a resize and userspace actions\n \t * are serialized by the mutex.\n \t /\n-\tlist_for_each_safe(l, lt, \u0026h-\u003ead) {\n+\tlist_for_each_safe(l, lt, \u0026orig-\u003ead) {\n \t\tx = list_entry(l, struct mtype_resize_ad, list);\n \t\tif (x-\u003ead == IPSET_ADD) {\n \t\t\tmtype_add(set, \u0026x-\u003ed, \u0026x-\u003eext, \u0026x-\u003emext, x-\u003eflags);\n@@ -792,11 +803,24 @@ mtype_resize(struct ip_set set, bool retried)\n \n cleanup:\n \trcu_read_unlock_bh();\n-\tatomic_set(\u0026orig-\u003eref, 0);\n+\tspin_lock_bh(\u0026h-\u003egc.lock);\n+\torig-\u003eresizing = false;\n+\tspin_unlock_bh(\u0026h-\u003egc.lock);\n+\t/* Make sure parallel readers see that orig-\u003eresizing is false\n+\t * before we decrement uref /\n+\tsynchronize_rcu();\n \tatomic_dec(\u0026orig-\u003euref);\n \tmtype_ahash_destroy(set, t, false);\n \tif (ret == -EAGAIN)\n \t\tgoto retry;\n+\n+\t/ Cleanup the backlog of ADD/DEL elements /\n+\tspin_lock_bh(\u0026set-\u003elock);\n+\tlist_for_each_safe(l, lt, \u0026orig-\u003ead) {\n+\t\tlist_del(l);\n+\t\tkfree(l);\n+\t}\n+\tspin_unlock_bh(\u0026set-\u003elock);\n \tgoto out;\n \n hbwarn:\n@@ -860,15 +884,13 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext,\n \tkey = HKEY(value, h-\u003einitval, t-\u003ehtable_bits);\n \tr = ahash_region(key);\n \tatomic_inc(\u0026t-\u003euref);\n+\trcu_read_unlock_bh();\n \telements = t-\u003ehregion[r].elements;\n \tmaxelem = t-\u003emaxelem;\n \tif (elements \u003e= maxelem) {\n \t\tu32 e;\n-\t\tif (SET_WITH_TIMEOUT(set)) {\n-\t\t\trcu_read_unlock_bh();\n+\t\tif (SET_WITH_TIMEOUT(set))\n \t\t\tmtype_gc_do(set, h, t, r);\n-\t\t\trcu_read_lock_bh();\n-\t\t}\n \t\tmaxelem = h-\u003emaxelem;\n \t\telements = 0;\n \t\tfor (e = 0; e \u003c ahash_numof_locks(t-\u003ehtable_bits); e++)\n@@ -876,7 +898,6 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext,\n \t\tif (elements \u003e= maxelem \u0026\u0026 SET_WITH_FORCEADD(set))\n \t\t\tforceadd = true;\n \t}\n-\trcu_read_unlock_bh();\n \n \tspin_lock_bh(\u0026t-\u003ehregion[r].lock);\n \tn = rcu_dereference_bh(hbucket(t, key));\n@@ -1003,7 +1024,7 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext,\n \tret = 0;\n resize:\n \tspin_unlock_bh(\u0026t-\u003ehregion[r].lock);\n-\tif (atomic_read(\u0026t-\u003eref) \u0026\u0026 ext-\u003etarget) {\n+\tif (t-\u003eresizing \u0026\u0026 ext \u0026\u0026 ext-\u003etarget) {\n \t\t/* Resize is in process and kernel side add, save values /\n \t\tstruct mtype_resize_ad x;\n \n@@ -1017,7 +1038,7 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext,\n \t\tmemcpy(\u0026x-\u003emext, mext, sizeof(struct ip_set_ext));\n \t\tx-\u003eflags = flags;\n \t\tspin_lock_bh(\u0026set-\u003elock);\n-\t\tlist_add_tail(\u0026x-\u003elist, \u0026h-\u003ead);\n+\t\tlist_add_tail(\u0026x-\u003elist, \u0026t-\u003ead);\n \t\tspin_unlock_bh(\u0026set-\u003elock);\n \t}\n \tgoto out;\n@@ -1030,7 +1051,7 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext,\n unlock:\n \tspin_unlock_bh(\u0026t-\u003ehregion[r].lock);\n out:\n-\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 atomic_read(\u0026t-\u003eref)) {\n+\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 t-\u003eresizing) {\n \t\tpr_debug(\"Table destroy after resize by add: %p\\n\", t);\n \t\tmtype_ahash_destroy(set, t, false);\n \t}\n@@ -1093,7 +1114,7 @@ mtype_del(struct ip_set set, void value, const struct ip_set_ext ext,\n #endif\n \t\tip_set_ext_destroy(set, data);\n \n-\t\tif (atomic_read(\u0026t-\u003eref) \u0026\u0026 ext-\u003etarget) {\n+\t\tif (t-\u003eresizing \u0026\u0026 ext \u0026\u0026 ext-\u003etarget) {\n \t\t\t/ Resize is in process and kernel side del,\n \t\t\t * save values\n \t\t\t /\n@@ -1141,10 +1162,10 @@ mtype_del(struct ip_set set, void value, const struct ip_set_ext ext,\n \tspin_unlock_bh(\u0026t-\u003ehregion[r].lock);\n \tif (x) {\n \t\tspin_lock_bh(\u0026set-\u003elock);\n-\t\tlist_add(\u0026x-\u003elist, \u0026h-\u003ead);\n+\t\tlist_add(\u0026x-\u003elist, \u0026t-\u003ead);\n \t\tspin_unlock_bh(\u0026set-\u003elock);\n \t}\n-\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 atomic_read(\u0026t-\u003eref)) {\n+\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 t-\u003eresizing) {\n \t\tpr_debug(\"Table destroy after resize by del: %p\\n\", t);\n \t\tmtype_ahash_destroy(set, t, false);\n \t}\n@@ -1353,7 +1374,7 @@ mtype_uref(struct ip_set set, struct netlink_callback cb, bool start)\n \t\trcu_read_unlock_bh();\n \t} else if (cb-\u003eargs[IPSET_CB_PRIVATE]) {\n \t\tt = (struct htable )cb-\u003eargs[IPSET_CB_PRIVATE];\n-\t\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 atomic_read(\u0026t-\u003eref)) {\n+\t\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 t-\u003eresizing) {\n \t\t\tpr_debug(\"Table destroy after resize \"\n \t\t\t\t \" by dump: %p\\n\", t);\n \t\t\tmtype_ahash_destroy(set, t, false);\n@@ -1566,7 +1587,13 @@ IPSET_TOKEN(HTYPE, _create)(struct net net, struct ip_set set,\n \tif (tb[IPSET_ATTR_MAXELEM])\n \t\tmaxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);\n \n-\thsize = sizeof(h);\n+#ifdef IP_SET_PROTO_UNDEF\n+\thsize = sizeof(struct htype);\n+#else\n+\thsize = set-\u003efamily == NFPROTO_IPV6 ?\n+\t\tsizeof(struct IPSET_TOKEN(HTYPE, 6)) :\n+\t\tsizeof(struct IPSET_TOKEN(HTYPE, 4));\n+#endif\n \th = kzalloc(hsize, GFP_KERNEL);\n \tif (!h)\n \t\treturn -ENOMEM;\n@@ -1593,6 +1620,7 @@ IPSET_TOKEN(HTYPE, _create)(struct net net, struct ip_set set,\n \t\treturn -ENOMEM;\n \t}\n \th-\u003egc.set = set;\n+\tspin_lock_init(\u0026h-\u003egc.lock);\n \tfor (i = 0; i \u003c ahash_numof_locks(hbits); i++)\n \t\tspin_lock_init(\u0026t-\u003ehregion[i].lock);\n \th-\u003emaxelem = maxelem;\n@@ -1619,9 +1647,8 @@ IPSET_TOKEN(HTYPE, _create)(struct net net, struct ip_set set,\n \t}\n \tt-\u003ehtable_bits = hbits;\n \tt-\u003emaxelem = h-\u003emaxelem / ahash_numof_locks(hbits);\n+\tINIT_LIST_HEAD(\u0026t-\u003ead);\n \tRCU_INIT_POINTER(h-\u003etable, t);\n-\n-\tINIT_LIST_HEAD(\u0026h-\u003ead);\n \tset-\u003edata = h;\n #ifndef IP_SET_PROTO_UNDEF\n \tif (set-\u003efamily == NFPROTO_IPV4) {\ndiff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c\nindex 906f2c36167638..35cbe821c25967 100644\n--- a/net/netfilter/ipvs/ip_vs_core.c\n+++ b/net/netfilter/ipvs/ip_vs_core.c\n@@ -398,10 +398,10 @@ ip_vs_conn_stats(struct ip_vs_conn cp, struct ip_vs_service svc)\n static inline void\n ip_vs_set_state(struct ip_vs_conn cp, int direction,\n \t\tconst struct sk_buff skb,\n-\t\tstruct ip_vs_proto_data pd)\n+\t\tstruct ip_vs_proto_data pd, unsigned int iph_len)\n {\n \tif (likely(pd-\u003epp-\u003estate_transition))\n-\t\tpd-\u003epp-\u003estate_transition(cp, direction, skb, pd);\n+\t\tpd-\u003epp-\u003estate_transition(cp, direction, skb, pd, iph_len);\n }\n \n static inline int\n@@ -803,7 +803,7 @@ int ip_vs_leave(struct ip_vs_service svc, struct sk_buff skb,\n \t\tip_vs_in_stats(cp, skb);\n \n \t\t/* set state /\n-\t\tip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);\n+\t\tip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd, iph-\u003elen);\n \n \t\t/ transmit the first SYN packet /\n \t\tret = cp-\u003epacket_xmit(skb, cp, pd-\u003epp, iph);\n@@ -1484,7 +1484,7 @@ handle_response(int af, struct sk_buff skb, struct ip_vs_proto_data pd,\n \n after_nat:\n \tip_vs_out_stats(cp, skb);\n-\tip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd);\n+\tip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd, iph-\u003elen);\n \tskb-\u003eipvs_property = 1;\n \tif (!(cp-\u003eflags \u0026 IP_VS_CONN_F_NFCT))\n \t\tip_vs_notrack(skb);\n@@ -1767,6 +1767,7 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related,\n \tbool tunnel, new_cp = false;\n \tunion nf_inet_addr raddr;\n \tchar outer_proto = \"IPIP\";\n+\tunsigned int hlen_ipip;\n \tint ulen = 0;\n \n \trelated = 1;\n@@ -1804,9 +1805,10 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related,\n \t/* Now find the contained IP header /\n \toffset += sizeof(_icmph);\n \tcih = skb_header_pointer(skb, offset, sizeof(_ciph), \u0026_ciph);\n-\tif (cih == NULL)\n+\tif (!(cih \u0026\u0026 cih-\u003eversion == 4 \u0026\u0026 cih-\u003eihl \u003e= 5))\n \t\treturn NF_ACCEPT; / The packet looks wrong, ignore /\n \traddr = (union nf_inet_addr )\u0026cih-\u003edaddr;\n+\thlen_ipip = cih-\u003eihl * 4;\n \n \t/* Special case for errors for IPIP/UDP/GRE tunnel packets /\n \ttunnel = false;\n@@ -1822,9 +1824,9 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related,\n \t\t/* Only for known tunnel /\n \t\tif (!dest \|\| dest-\u003etun_type != IP_VS_CONN_F_TUNNEL_TYPE_IPIP)\n \t\t\treturn NF_ACCEPT;\n-\t\toffset += cih-\u003eihl 4;\n+\t\toffset += hlen_ipip;\n \t\tcih = skb_header_pointer(skb, offset, sizeof(_ciph), \u0026_ciph);\n-\t\tif (cih == NULL)\n+\t\tif (!(cih \u0026\u0026 cih-\u003eversion == 4 \u0026\u0026 cih-\u003eihl \u003e= 5))\n \t\t\treturn NF_ACCEPT; /* The packet looks wrong, ignore /\n \t\ttunnel = true;\n \t} else if ((cih-\u003eprotocol == IPPROTO_UDP \|\|\t/ Can be UDP encap /\n@@ -1836,7 +1838,7 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related,\n \t\t/* Non-first fragment has no UDP/GRE header /\n \t\tif (unlikely(cih-\u003efrag_off \u0026 htons(IP_OFFSET)))\n \t\t\treturn NF_ACCEPT;\n-\t\toffset2 = offset + cih-\u003eihl 4;\n+\t\toffset2 = offset + hlen_ipip;\n \t\tif (cih-\u003eprotocol == IPPROTO_UDP) {\n \t\t\tulen = ipvs_udp_decap(ipvs, skb, offset2, AF_INET,\n \t\t\t\t\t raddr, \u0026iproto);\n@@ -1905,6 +1907,7 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related,\n \t}\n \n \tif (tunnel) {\n+\t\tunsigned int hlen_orig = cih-\u003eihl 4;\n \t\t__be32 info = ic-\u003eun.gateway;\n \t\t__u8 type = ic-\u003etype;\n \t\t__u8 code = ic-\u003ecode;\n@@ -1921,6 +1924,9 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related,\n \t\t\t\tgoto ignore_tunnel;\n \t\t\toffset2 -= ihl + sizeof(_icmph);\n \t\t\tskb_reset_network_header(skb);\n+\t\t\t/ Ensure the IP header is present in headroom /\n+\t\t\tif (!pskb_may_pull(skb, hlen_ipip))\n+\t\t\t\tgoto ignore_tunnel;\n \t\t\tIP_VS_DBG(12, \"ICMP for %s %pI4-\u003e%pI4: mtu=%u\\n\",\n \t\t\t\t outer_proto, \u0026ip_hdr(skb)-\u003esaddr,\n \t\t\t\t \u0026ip_hdr(skb)-\u003edaddr, mtu);\n@@ -1936,8 +1942,8 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related,\n \t\t\t\tif (dest_dst)\n \t\t\t\t\tmtu = dst_mtu(dest_dst-\u003edst_cache);\n \t\t\t}\n-\t\t\tif (mtu \u003e 68 + sizeof(struct iphdr) + ulen)\n-\t\t\t\tmtu -= sizeof(struct iphdr) + ulen;\n+\t\t\tif (mtu \u003e 68 + hlen_ipip + ulen)\n+\t\t\t\tmtu -= hlen_ipip + ulen;\n \t\t\tinfo = htonl(mtu);\n \t\t}\n \t\t/* Strip outer IP, ICMP and IPIP/UDP/GRE, go to IP header of\n@@ -1946,6 +1952,9 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related,\n \t\tif (pskb_pull(skb, offset2) == NULL)\n \t\t\tgoto ignore_tunnel;\n \t\tskb_reset_network_header(skb);\n+\t\t/ Ensure the IP header is present in headroom /\n+\t\tif (!pskb_may_pull(skb, hlen_orig))\n+\t\t\tgoto ignore_tunnel;\n \t\tIP_VS_DBG(12, \"Sending ICMP for %pI4-\u003e%pI4: t=%u, c=%u, i=%u\\n\",\n \t\t\t\u0026ip_hdr(skb)-\u003esaddr, \u0026ip_hdr(skb)-\u003edaddr,\n \t\t\ttype, code, ntohl(info));\n@@ -2233,7 +2242,7 @@ ip_vs_in_hook(void priv, struct sk_buff skb, const struct nf_hook_state state\n \tIP_VS_DBG_PKT(11, af, pp, skb, iph.off, \"Incoming packet\");\n \n \tip_vs_in_stats(cp, skb);\n-\tip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);\n+\tip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd, iph.len);\n \tif (cp-\u003epacket_xmit)\n \t\tret = cp-\u003epacket_xmit(skb, cp, pp, \u0026iph);\n \t\t/* do not touch skb anymore /\ndiff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c\nindex 63c78a1f3918a7..c67317be17dfaf 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_sctp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c\n@@ -372,20 +372,15 @@ static const char sctp_state_name(int state)\n \n static inline void\n set_sctp_state(struct ip_vs_proto_data pd, struct ip_vs_conn cp,\n-\t\tint direction, const struct sk_buff skb)\n+\t\tint direction, const struct sk_buff skb,\n+\t\tunsigned int iph_len)\n {\n \tstruct sctp_chunkhdr _sctpch, sch;\n \tunsigned char chunk_type;\n \tint event, next_state;\n-\tint ihl, cofs;\n+\tint cofs;\n \n-#ifdef CONFIG_IP_VS_IPV6\n-\tihl = cp-\u003eaf == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);\n-#else\n-\tihl = ip_hdrlen(skb);\n-#endif\n-\n-\tcofs = ihl + sizeof(struct sctphdr);\n+\tcofs = iph_len + sizeof(struct sctphdr);\n \tsch = skb_header_pointer(skb, cofs, sizeof(_sctpch), \u0026_sctpch);\n \tif (sch == NULL)\n \t\treturn;\n@@ -468,10 +463,11 @@ set_sctp_state(struct ip_vs_proto_data pd, struct ip_vs_conn cp,\n \n static void\n sctp_state_transition(struct ip_vs_conn cp, int direction,\n-\t\tconst struct sk_buff skb, struct ip_vs_proto_data pd)\n+\t\tconst struct sk_buff skb, struct ip_vs_proto_data pd,\n+\t\tunsigned int iph_len)\n {\n \tspin_lock_bh(\u0026cp-\u003elock);\n-\tset_sctp_state(pd, cp, direction, skb);\n+\tset_sctp_state(pd, cp, direction, skb, iph_len);\n \tspin_unlock_bh(\u0026cp-\u003elock);\n }\n \ndiff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c\nindex 8cc0a8ce624112..f86b763efcc4dc 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_tcp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c\n@@ -579,17 +579,12 @@ set_tcp_state(struct ip_vs_proto_data pd, struct ip_vs_conn cp,\n static void\n tcp_state_transition(struct ip_vs_conn cp, int direction,\n \t\t const struct sk_buff skb,\n-\t\t struct ip_vs_proto_data pd)\n+\t\t struct ip_vs_proto_data pd,\n+\t\t unsigned int iph_len)\n {\n \tstruct tcphdr _tcph, th;\n \n-#ifdef CONFIG_IP_VS_IPV6\n-\tint ihl = cp-\u003eaf == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);\n-#else\n-\tint ihl = ip_hdrlen(skb);\n-#endif\n-\n-\tth = skb_header_pointer(skb, ihl, sizeof(_tcph), \u0026_tcph);\n+\tth = skb_header_pointer(skb, iph_len, sizeof(_tcph), \u0026_tcph);\n \tif (th == NULL)\n \t\treturn;\n \ndiff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c\nindex f9de632e38cdd6..58f9e255927e2e 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_udp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c\n@@ -444,7 +444,8 @@ static const char udp_state_name(int state)\n static void\n udp_state_transition(struct ip_vs_conn cp, int direction,\n \t\t const struct sk_buff skb,\n-\t\t struct ip_vs_proto_data pd)\n+\t\t struct ip_vs_proto_data pd,\n+\t\t unsigned int iph_len)\n {\n \tif (unlikely(!pd)) {\n \t\tpr_err(\"UDP no ns data\\n\");\ndiff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c\nindex 99c5b9d671a0ca..2a829b5e8240a7 100644\n--- a/net/netfilter/nf_flow_table_core.c\n+++ b/net/netfilter/nf_flow_table_core.c\n@@ -127,12 +127,18 @@ static int flow_offload_fill_route(struct flow_offload flow,\n \n \tswitch (route-\u003etuple[dir].xmit_type) {\n \tcase FLOW_OFFLOAD_XMIT_DIRECT:\n+\t\tif (flow_tuple-\u003etun_num) {\n+\t\t\tflow_tuple-\u003edst_cache = dst;\n+\t\t\tflow_tuple-\u003edst_cookie =\n+\t\t\t\tflow_offload_dst_cookie(flow_tuple);\n+\t\t}\n \t\tmemcpy(flow_tuple-\u003eout.h_dest, route-\u003etuple[dir].out.h_dest,\n \t\t ETH_ALEN);\n \t\tmemcpy(flow_tuple-\u003eout.h_source, route-\u003etuple[dir].out.h_source,\n \t\t ETH_ALEN);\n \t\tflow_tuple-\u003eout.ifidx = route-\u003etuple[dir].out.ifindex;\n-\t\tdst_release(dst);\n+\t\tif (!flow_tuple-\u003etun_num)\n+\t\t\tdst_release(dst);\n \t\tbreak;\n \tcase FLOW_OFFLOAD_XMIT_XFRM:\n \tcase FLOW_OFFLOAD_XMIT_NEIGH:\n@@ -152,9 +158,7 @@ static int flow_offload_fill_route(struct flow_offload flow,\n static void nft_flow_dst_release(struct flow_offload flow,\n \t\t\t\t enum flow_offload_tuple_dir dir)\n {\n-\tif (flow-\u003etuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH \|\|\n-\t flow-\u003etuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM)\n-\t\tdst_release(flow-\u003etuplehash[dir].tuple.dst_cache);\n+\tdst_release(flow-\u003etuplehash[dir].tuple.dst_cache);\n }\n \n void flow_offload_route_init(struct flow_offload flow,\n@@ -345,10 +349,8 @@ int flow_offload_add(struct nf_flowtable flow_table, struct flow_offload flow)\n \n \tnf_ct_refresh(flow-\u003ect, NF_CT_DAY);\n \n-\tif (nf_flowtable_hw_offload(flow_table)) {\n-\t\t__set_bit(NF_FLOW_HW, \u0026flow-\u003eflags);\n+\tif (nf_flowtable_hw_offload(flow_table))\n \t\tnf_flow_offload_add(flow_table, flow);\n-\t}\n \n \treturn 0;\n }\n@@ -369,7 +371,8 @@ void flow_offload_refresh(struct nf_flowtable flow_table,\n \t test_bit(NF_FLOW_CLOSING, \u0026flow-\u003eflags))\n \t\treturn;\n \n-\tnf_flow_offload_add(flow_table, flow);\n+\tif (test_bit(NF_FLOW_HW, \u0026flow-\u003eflags))\n+\t\tnf_flow_offload_refresh(flow_table, flow);\n }\n EXPORT_SYMBOL_GPL(flow_offload_refresh);\n \ndiff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c\nindex 29e93ac1e2e400..0b78decce8a9bd 100644\n--- a/net/netfilter/nf_flow_table_ip.c\n+++ b/net/netfilter/nf_flow_table_ip.c\n@@ -299,8 +299,7 @@ static bool nf_flow_exceeds_mtu(const struct sk_buff skb, unsigned int mtu)\n \n static inline bool nf_flow_dst_check(struct flow_offload_tuple tuple)\n {\n-\tif (tuple-\u003exmit_type != FLOW_OFFLOAD_XMIT_NEIGH \u0026\u0026\n-\t tuple-\u003exmit_type != FLOW_OFFLOAD_XMIT_XFRM)\n+\tif (!tuple-\u003edst_cache)\n \t\treturn true;\n \n \treturn dst_check(tuple-\u003edst_cache, tuple-\u003edst_cookie);\n@@ -590,10 +589,10 @@ static int nf_flow_pppoe_push(struct sk_buff skb, u16 id,\n \n static int nf_flow_tunnel_ipip_push(struct net net, struct sk_buff skb,\n \t\t\t\t struct flow_offload_tuple tuple,\n-\t\t\t\t __be32 ip_daddr)\n+\t\t\t\t struct dst_entry dst, __be32 ip_daddr)\n {\n \tstruct iphdr iph = (struct iphdr )skb_network_header(skb);\n-\tstruct rtable rt = dst_rtable(tuple-\u003edst_cache);\n+\tstruct rtable rt = dst_rtable(dst);\n \tu8 tos = iph-\u003etos, ttl = iph-\u003ettl;\n \t__be16 frag_off = iph-\u003efrag_off;\n \tu32 headroom = sizeof(iph);\n@@ -636,21 +635,22 @@ static int nf_flow_tunnel_ipip_push(struct net net, struct sk_buff skb,\n \n static int nf_flow_tunnel_v4_push(struct net net, struct sk_buff skb,\n \t\t\t\t struct flow_offload_tuple tuple,\n-\t\t\t\t __be32 ip_daddr)\n+\t\t\t\t struct dst_entry dst, __be32 ip_daddr)\n {\n \tif (tuple-\u003etun_num)\n-\t\treturn nf_flow_tunnel_ipip_push(net, skb, tuple, ip_daddr);\n+\t\treturn nf_flow_tunnel_ipip_push(net, skb, tuple, dst, ip_daddr);\n \n \treturn 0;\n }\n \n static int nf_flow_tunnel_ip6ip6_push(struct net net, struct sk_buff skb,\n \t\t\t\t struct flow_offload_tuple tuple,\n+\t\t\t\t struct dst_entry dst,\n \t\t\t\t struct in6_addr ip6_daddr)\n {\n \tstruct ipv6hdr ip6h = (struct ipv6hdr )skb_network_header(skb);\n-\tstruct rtable rt = dst_rtable(tuple-\u003edst_cache);\n \t__u8 dsfield = ipv6_get_dsfield(ip6h);\n+\tstruct rtable rt = dst_rtable(dst);\n \tstruct flowi6 fl6 = {\n \t\t.daddr = tuple-\u003etun.src_v6,\n \t\t.saddr = tuple-\u003etun.dst_v6,\n@@ -696,10 +696,11 @@ static int nf_flow_tunnel_ip6ip6_push(struct net net, struct sk_buff skb,\n \n static int nf_flow_tunnel_v6_push(struct net net, struct sk_buff skb,\n \t\t\t\t struct flow_offload_tuple tuple,\n+\t\t\t\t struct dst_entry dst,\n \t\t\t\t struct in6_addr ip6_daddr)\n {\n \tif (tuple-\u003etun_num)\n-\t\treturn nf_flow_tunnel_ip6ip6_push(net, skb, tuple, ip6_daddr);\n+\t\treturn nf_flow_tunnel_ip6ip6_push(net, skb, tuple, dst, ip6_daddr);\n \n \treturn 0;\n }\n@@ -842,7 +843,8 @@ nf_flow_offload_ip_hook(void priv, struct sk_buff skb,\n \tother_tuple = \u0026flow-\u003etuplehash[!dir].tuple;\n \tip_daddr = other_tuple-\u003esrc_v4.s_addr;\n \n-\tif (nf_flow_tunnel_v4_push(state-\u003enet, skb, other_tuple, \u0026ip_daddr) \u003c 0)\n+\tif (nf_flow_tunnel_v4_push(state-\u003enet, skb, other_tuple,\n+\t\t\t\t tuplehash-\u003etuple.dst_cache, \u0026ip_daddr) \u003c 0)\n \t\treturn NF_DROP;\n \n \tswitch (tuplehash-\u003etuple.xmit_type) {\n@@ -1158,6 +1160,7 @@ nf_flow_offload_ipv6_hook(void priv, struct sk_buff skb,\n \tip6_daddr = \u0026other_tuple-\u003esrc_v6;\n \n \tif (nf_flow_tunnel_v6_push(state-\u003enet, skb, other_tuple,\n+\t\t\t\t tuplehash-\u003etuple.dst_cache,\n \t\t\t\t \u0026ip6_daddr) \u003c 0)\n \t\treturn NF_DROP;\n \ndiff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c\nindex 002ec15d988bdb..801a3dd9ceea3d 100644\n--- a/net/netfilter/nf_flow_table_offload.c\n+++ b/net/netfilter/nf_flow_table_offload.c\n@@ -1101,9 +1101,17 @@ nf_flow_offload_work_alloc(struct nf_flowtable flowtable,\n \treturn offload;\n }\n \n+static bool nf_flow_offload_unsupported(struct flow_offload flow)\n+{\n+\tif (flow-\u003etuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.tun_num \|\|\n+\t flow-\u003etuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.tun_num)\n+\t\treturn true;\n \n-void nf_flow_offload_add(struct nf_flowtable flowtable,\n-\t\t\t struct flow_offload flow)\n+\treturn false;\n+}\n+\n+void nf_flow_offload_refresh(struct nf_flowtable flowtable,\n+\t\t\t struct flow_offload flow)\n {\n \tstruct flow_offload_work offload;\n \n@@ -1114,6 +1122,16 @@ void nf_flow_offload_add(struct nf_flowtable flowtable,\n \tflow_offload_queue_work(offload);\n }\n \n+void nf_flow_offload_add(struct nf_flowtable flowtable,\n+\t\t\t struct flow_offload flow)\n+{\n+\tif (nf_flow_offload_unsupported(flow))\n+\t\treturn;\n+\n+\tset_bit(NF_FLOW_HW, \u0026flow-\u003eflags);\n+\tnf_flow_offload_refresh(flowtable, flow);\n+}\n+\n void nf_flow_offload_del(struct nf_flowtable flowtable,\n \t\t\t struct flow_offload flow)\n {\ndiff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c\nindex fa36575998616f..5fee61b3813cbc 100644\n--- a/net/netfilter/nfnetlink_log.c\n+++ b/net/netfilter/nfnetlink_log.c\n@@ -676,7 +676,7 @@ __build_packet_message(struct nfnl_log_net log,\n \t\t\tgoto nla_put_failure;\n \n \t\tif (skb_copy_bits(skb, 0, nla_data(nla), data_len))\n-\t\t\tBUG();\n+\t\t\tgoto nla_put_failure;\n \t}\n \n \tnlh-\u003enlmsg_len = inst-\u003eskb-\u003etail - old_tail;\n@@ -698,6 +698,21 @@ static const struct nf_loginfo default_loginfo = {\n \t},\n };\n \n+static unsigned int nfulnl_get_copy_len(const struct nf_loginfo li,\n+\t\t\t\t\tconst struct sk_buff skb,\n+\t\t\t\t\tunsigned int copy_len)\n+{\n+\tunsigned int len = skb-\u003elen;\n+\n+\tif ((li-\u003eu.ulog.flags \u0026 NF_LOG_F_COPY_LEN) \u0026\u0026\n+\t li-\u003eu.ulog.copy_len \u003c copy_len)\n+\t\tcopy_len = li-\u003eu.ulog.copy_len;\n+\tif (!skb_frags_readable(skb))\n+\t\tlen = skb_headlen(skb);\n+\n+\treturn min(len, copy_len);\n+}\n+\n /* log handler for internal netfilter logging api /\n static void\n nfulnl_log_packet(struct net net,\n@@ -790,14 +805,7 @@ nfulnl_log_packet(struct net net,\n \t\tbreak;\n \n \tcase NFULNL_COPY_PACKET:\n-\t\tdata_len = inst-\u003ecopy_range;\n-\t\tif ((li-\u003eu.ulog.flags \u0026 NF_LOG_F_COPY_LEN) \u0026\u0026\n-\t\t (li-\u003eu.ulog.copy_len \u003c data_len))\n-\t\t\tdata_len = li-\u003eu.ulog.copy_len;\n-\n-\t\tif (data_len \u003e skb-\u003elen)\n-\t\t\tdata_len = skb-\u003elen;\n-\n+\t\tdata_len = nfulnl_get_copy_len(li, skb, inst-\u003ecopy_range);\n \t\tsize += nla_total_size(data_len);\n \t\tbreak;\n \ndiff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c\nindex 35d4c6c628ffc1..b8aaf39cb4d8ea 100644\n--- a/net/netfilter/nfnetlink_queue.c\n+++ b/net/netfilter/nfnetlink_queue.c\n@@ -690,6 +690,17 @@ static int nfqnl_put_master_ifindex(struct sk_buff nlskb, int attr,\n }\n #endif\n \n+static unsigned int nfqnl_get_data_len(const struct sk_buff entskb,\n+\t\t\t\t unsigned int copy_range)\n+{\n+\tunsigned int data_len = entskb-\u003elen;\n+\n+\tif (!skb_frags_readable(entskb))\n+\t\tdata_len = skb_headlen(entskb);\n+\n+\treturn min(data_len, copy_range);\n+}\n+\n static struct sk_buff \n nfqnl_build_packet_message(struct net net, struct nfqnl_instance queue,\n \t\t\t struct nf_queue_entry entry,\n@@ -755,10 +766,7 @@ nfqnl_build_packet_message(struct net net, struct nfqnl_instance queue,\n \t\t nf_queue_checksum_help(entskb))\n \t\t\treturn NULL;\n \n-\t\tdata_len = READ_ONCE(queue-\u003ecopy_range);\n-\t\tif (data_len \u003e entskb-\u003elen)\n-\t\t\tdata_len = entskb-\u003elen;\n-\n+\t\tdata_len = nfqnl_get_data_len(entskb, READ_ONCE(queue-\u003ecopy_range));\n \t\thlen = skb_zerocopy_headlen(entskb);\n \t\thlen = min_t(unsigned int, hlen, data_len);\n \t\tsize += sizeof(struct nlattr) + hlen;\ndiff --git a/net/netfilter/nft_lookup.c b/net/netfilter/nft_lookup.c\nindex ba512e94b4023f..19887439847d11 100644\n--- a/net/netfilter/nft_lookup.c\n+++ b/net/netfilter/nft_lookup.c\n@@ -103,13 +103,13 @@ void nft_lookup_eval(const struct nft_expr expr,\n \tbool found;\n \n \text = nft_set_do_lookup(net, set, \u0026regs-\u003edata[priv-\u003esreg]);\n+\tif (!ext)\n+\t\text = nft_set_catchall_lookup(net, set);\n+\n \tfound = !!ext ^ priv-\u003einvert;\n \tif (!found) {\n-\t\text = nft_set_catchall_lookup(net, set);\n-\t\tif (!ext) {\n-\t\t\tregs-\u003everdict.code = NFT_BREAK;\n-\t\t\treturn;\n-\t\t}\n+\t\tregs-\u003everdict.code = NFT_BREAK;\n+\t\treturn;\n \t}\n \n \tif (ext) {\ndiff --git a/net/netfilter/xt_u32.c b/net/netfilter/xt_u32.c\nindex ec1a21e3b6e2c3..dabbaa742874cb 100644\n--- a/net/netfilter/xt_u32.c\n+++ b/net/netfilter/xt_u32.c\n@@ -14,8 +14,8 @@\n #include \u003clinux/netfilter/x_tables.h\u003e\n #include \u003clinux/netfilter/xt_u32.h\u003e\n \n-static bool u32_match_it(const struct xt_u32 data,\n-\t\t\t const struct sk_buff skb)\n+static int u32_match_it(const struct xt_u32 data,\n+\t\t\tconst struct sk_buff skb)\n {\n \tconst struct xt_u32_test ct;\n \tunsigned int testind;\n@@ -40,7 +40,8 @@ static bool u32_match_it(const struct xt_u32 data,\n \t\t\treturn false;\n \n \t\tif (skb_copy_bits(skb, pos, \u0026n, sizeof(n)) \u003c 0)\n-\t\t\tBUG();\n+\t\t\treturn -1;\n+\n \t\tval = ntohl(n);\n \t\tnnums = ct-\u003ennums;\n \n@@ -68,7 +69,7 @@ static bool u32_match_it(const struct xt_u32 data,\n \n \t\t\t\tif (skb_copy_bits(skb, at + pos, \u0026n,\n \t\t\t\t\t\t sizeof(n)) \u003c 0)\n-\t\t\t\t\tBUG();\n+\t\t\t\t\treturn -1;\n \t\t\t\tval = ntohl(n);\n \t\t\t\tbreak;\n \t\t\t}\n@@ -90,9 +91,14 @@ static bool u32_match_it(const struct xt_u32 data,\n static bool u32_mt(const struct sk_buff skb, struct xt_action_param par)\n {\n \tconst struct xt_u32 *data = par-\u003ematchinfo;\n-\tbool ret;\n+\tint ret;\n \n \tret = u32_match_it(data, skb);\n+\tif (ret \u003c 0) {\n+\t\tpar-\u003ehotdrop = true;\n+\t\treturn false;\n+\t}\n+\n \treturn ret ^ data-\u003einvert;\n }\n \n" }
2/1	2026/07/09 06:57	agent	patch-evaluator	8m Model: gemini-3.1-pro-preview Args: null Results: { "EnableConfigs": [ "IP_VS", "IP_VS_PROTO_TCP", "IP_VS_PROTO_UDP", "IP_VS_PROTO_SCTP", "NF_FLOW_TABLE", "BRIDGE_NF_EBTABLES", "IP_SET", "IP_SET_HASH_IP", "NETFILTER_NETLINK_LOG", "NETFILTER_NETLINK_QUEUE", "NF_TABLES", "NETFILTER_XT_MATCH_U32", "NF_DEFRAG_IPV6" ], "FocusSymbols": [ "ip_vs_in_icmp", "sctp_state_transition", "tcp_state_transition", "udp_state_transition", "flow_offload_route_init", "nf_flow_offload_ip_hook", "nf_flow_offload_ipv6_hook", "nf_flow_offload_add", "nf_flow_offload_refresh", "ebt_check_entry", "do_ebt_set_ctl", "compat_do_replace", "nf_ct_frag6_gather", "hash_ip4_gc", "hash_ip4_resize", "hash_ip4_add", "hash_ip4_del", "hash_ip6_gc", "hash_ip6_resize", "hash_ip6_add", "hash_ip6_del", "nfulnl_log_packet", "nfqnl_build_packet_message", "nft_lookup_eval", "u32_mt" ], "Reasoning": "The patch contains functional changes to various netfilter and ipvs components, fixing potential out-of-bounds reads, incorrect header length calculations, and synchronization issues. It modifies reachable core kernel logic and should be fuzzed.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Do not list too generic configs (we already have them enabled). Only list those that specifically cover the modified code. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes: commit d172f8e019d60662a8e73adbe4a86161cec84419 Author: syz-cluster <triage@syzkaller.com> Date: Thu Jul 9 06:57:34 2026 +0000 syz-cluster: applied patch under review diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h index 49297fec448a82..417ff51f62fc8e 100644 --- a/include/net/ip_vs.h +++ b/include/net/ip_vs.h @@ -752,7 +752,8 @@ struct ip_vs_protocol { void (state_transition)(struct ip_vs_conn cp, int direction, const struct sk_buff skb, - struct ip_vs_proto_data pd); + struct ip_vs_proto_data pd, + unsigned int iph_len); int (register_app)(struct netns_ipvs ipvs, struct ip_vs_app inc); diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h index 7b23b245a5a86a..ce414118962f54 100644 --- a/include/net/netfilter/nf_flow_table.h +++ b/include/net/netfilter/nf_flow_table.h @@ -155,11 +155,12 @@ struct flow_offload_tuple { tun_num:2, in_vlan_ingress:2; u16 mtu; + u32 dst_cookie; + struct dst_entry dst_cache; + union { struct { - struct dst_entry dst_cache; u32 ifidx; - u32 dst_cookie; }; struct { u32 ifidx; @@ -357,6 +358,8 @@ static inline int nf_flow_register_bpf(void) void nf_flow_offload_add(struct nf_flowtable flowtable, struct flow_offload flow); +void nf_flow_offload_refresh(struct nf_flowtable flowtable, + struct flow_offload flow); void nf_flow_offload_del(struct nf_flowtable flowtable, struct flow_offload flow); void nf_flow_offload_stats(struct nf_flowtable flowtable, diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index f20c039e44c8d7..96c9a8f57c8702 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -403,6 +403,9 @@ ebt_check_match(struct ebt_entry_match m, struct xt_mtchk_param par, left - sizeof(struct ebt_entry_match) < m->match_size) return -EINVAL; + if (strnlen(m->u.name, XT_EXTENSION_MAXNAMELEN) == XT_EXTENSION_MAXNAMELEN) + return -EINVAL; + match = xt_find_match(NFPROTO_BRIDGE, m->u.name, m->u.revision); if (IS_ERR(match) \|\| match->family != NFPROTO_BRIDGE) { if (!IS_ERR(match)) @@ -921,8 +924,7 @@ static int translate_table(struct net net, const char name, if an error occurs / newinfo->chainstack = - vmalloc_array(nr_cpu_ids, - sizeof((newinfo->chainstack))); + vcalloc(nr_cpu_ids, sizeof((newinfo->chainstack))); if (!newinfo->chainstack) return -ENOMEM; for_each_possible_cpu(i) { @@ -1434,6 +1436,8 @@ static int update_counters(struct net net, sockptr_t arg, unsigned int len) if (copy_from_sockptr(&hlp, arg, sizeof(hlp))) return -EFAULT; + hlp.name[sizeof(hlp.name) - 1] = '\0'; + if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter)) return -EINVAL; @@ -2273,6 +2277,8 @@ static int compat_copy_ebt_replace_from_user(struct ebt_replace repl, memcpy(repl, &tmp, offsetof(struct ebt_replace, hook_entry)); + repl->name[sizeof(repl->name) - 1] = '\0'; + / starting with hook_entry, 32 vs. 64 bit structures are different / for (i = 0; i < NF_BR_NUMHOOKS; i++) repl->hook_entry[i] = compat_ptr(tmp.hook_entry[i]); @@ -2395,6 +2401,8 @@ static int compat_update_counters(struct net net, sockptr_t arg, if (copy_from_sockptr(&hlp, arg, sizeof(hlp))) return -EFAULT; + hlp.name[sizeof(hlp.name) - 1] = '\0'; + /* try real handler in case userland supplied needed padding / if (len != sizeof(hlp) + hlp.num_counters sizeof(struct ebt_counter)) return update_counters(net, arg, len); diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c index 64ab23ff559bb9..599c49bf0a0afd 100644 --- a/net/ipv6/netfilter/nf_conntrack_reasm.c +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c @@ -348,7 +348,8 @@ static int nf_ct_frag6_reasm(struct frag_queue fq, struct sk_buff skb, skb_network_header(skb)[fq->nhoffset] = skb_transport_header(skb)[0]; memmove(skb->head + sizeof(struct frag_hdr), skb->head, (skb->data - skb->head) - sizeof(struct frag_hdr)); - skb->mac_header += sizeof(struct frag_hdr); + if (skb_mac_header_was_set(skb)) + skb->mac_header += sizeof(struct frag_hdr); skb->network_header += sizeof(struct frag_hdr); skb_reset_transport_header(skb); @@ -418,7 +419,7 @@ find_prev_fhdr(struct sk_buff skb, u8 prevhdrp, int prevhoff, int fhoff) return -1; } if (skb_copy_bits(skb, start, &hdr, sizeof(hdr))) - BUG(); + return -1; if (nexthdr == NEXTHDR_AUTH) hdrlen = ipv6_authlen(&hdr); else diff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h index dedf59b661ddf3..8231317b0f1f4b 100644 --- a/net/netfilter/ipset/ip_set_hash_gen.h +++ b/net/netfilter/ipset/ip_set_hash_gen.h @@ -75,15 +75,17 @@ struct hbucket { struct htable_gc { struct delayed_work dwork; struct ip_set set; / Set the gc belongs to / + spinlock_t lock; / Lock to exclude gc and resize / u32 region; / Last gc run position / }; / The hash table: the table size stored here in order to make resizing easy / struct htable { - atomic_t ref; / References for resizing / + bool resizing; / Mark ongoing resize / atomic_t uref; / References for dumping and gc / u8 htable_bits; / size of hash table == 2^htable_bits / u32 maxelem; / Maxelem per region / + struct list_head ad; / Resize add\|del backlist / struct ip_set_region hregion; /* Region locks and ext sizes / struct hbucket __rcu bucket[]; /* hashtable buckets / }; @@ -301,11 +303,13 @@ struct htype { u8 netmask; / netmask value for subnets to store / union nf_inet_addr bitmask; / stores bitmask / #endif - struct list_head ad; / Resize add\|del backlist / - struct mtype_elem next; / temporary storage for uadd / #ifdef IP_SET_HASH_WITH_NETS struct net_prefixes nets[NLEN]; / book-keeping of prefixes / #endif + / Because 'next' is IPv4/IPv6 dependent, no elements of this + * structure and referred in create() may come after 'next'. + / + struct mtype_elem next; / temporary storage for uadd / }; / ADD\|DEL entries saved during resize / @@ -451,13 +455,14 @@ static void mtype_destroy(struct ip_set set) { struct htype h = set->data; + struct htable t = (__force struct htable )h->table; struct list_head l, lt; - mtype_ahash_destroy(set, (__force struct htable )h->table, true); - list_for_each_safe(l, lt, &h->ad) { + list_for_each_safe(l, lt, &t->ad) { list_del(l); kfree(l); } + mtype_ahash_destroy(set, t, true); kfree(h); set->data = NULL; @@ -569,9 +574,10 @@ mtype_gc(struct work_struct work) set = gc->set; h = set->data; - spin_lock_bh(&set->lock); - t = ipset_dereference_set(h->table, set); + rcu_read_lock_bh(); + t = rcu_dereference_bh(h->table); atomic_inc(&t->uref); + rcu_read_unlock_bh(); numof_locks = ahash_numof_locks(t->htable_bits); r = gc->region++; if (r >= numof_locks) { @@ -580,11 +586,13 @@ mtype_gc(struct work_struct work) next_run = (IPSET_GC_PERIOD(set->timeout) * HZ) / numof_locks; if (next_run < HZ/10) next_run = HZ/10; - spin_unlock_bh(&set->lock); - mtype_gc_do(set, h, t, r); + spin_lock_bh(&gc->lock); + if (!t->resizing) + mtype_gc_do(set, h, t, r); + spin_unlock_bh(&gc->lock); - if (atomic_dec_and_test(&t->uref) && atomic_read(&t->ref)) { + if (atomic_dec_and_test(&t->uref) && t->resizing) { pr_debug("Table destroy after resize by expire: %p\n", t); mtype_ahash_destroy(set, t, false); } @@ -668,15 +676,18 @@ mtype_resize(struct ip_set set, bool retried) } t->htable_bits = htable_bits; t->maxelem = h->maxelem / ahash_numof_locks(htable_bits); + INIT_LIST_HEAD(&t->ad); for (i = 0; i < ahash_numof_locks(htable_bits); i++) spin_lock_init(&t->hregion[i].lock); / There can't be another parallel resizing, - * but dumping, gc, kernel side add/del are possible + * but dumping and kernel side add/del are possible / orig = ipset_dereference_bh_nfnl(h->table); - atomic_set(&orig->ref, 1); atomic_inc(&orig->uref); + spin_lock_bh(&h->gc.lock); + orig->resizing = true; + spin_unlock_bh(&h->gc.lock); pr_debug("attempt to resize set %s from %u to %u, t %p\n", set->name, orig->htable_bits, htable_bits, orig); for (r = 0; r < ahash_numof_locks(orig->htable_bits); r++) { @@ -768,7 +779,7 @@ mtype_resize(struct ip_set set, bool retried) * Kernel-side add cannot trigger a resize and userspace actions * are serialized by the mutex. / - list_for_each_safe(l, lt, &h->ad) { + list_for_each_safe(l, lt, &orig->ad) { x = list_entry(l, struct mtype_resize_ad, list); if (x->ad == IPSET_ADD) { mtype_add(set, &x->d, &x->ext, &x->mext, x->flags); @@ -792,11 +803,24 @@ mtype_resize(struct ip_set set, bool retried) cleanup: rcu_read_unlock_bh(); - atomic_set(&orig->ref, 0); + spin_lock_bh(&h->gc.lock); + orig->resizing = false; + spin_unlock_bh(&h->gc.lock); + /* Make sure parallel readers see that orig->resizing is false + * before we decrement uref / + synchronize_rcu(); atomic_dec(&orig->uref); mtype_ahash_destroy(set, t, false); if (ret == -EAGAIN) goto retry; + + / Cleanup the backlog of ADD/DEL elements / + spin_lock_bh(&set->lock); + list_for_each_safe(l, lt, &orig->ad) { + list_del(l); + kfree(l); + } + spin_unlock_bh(&set->lock); goto out; hbwarn: @@ -860,15 +884,13 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext, key = HKEY(value, h->initval, t->htable_bits); r = ahash_region(key); atomic_inc(&t->uref); + rcu_read_unlock_bh(); elements = t->hregion[r].elements; maxelem = t->maxelem; if (elements >= maxelem) { u32 e; - if (SET_WITH_TIMEOUT(set)) { - rcu_read_unlock_bh(); + if (SET_WITH_TIMEOUT(set)) mtype_gc_do(set, h, t, r); - rcu_read_lock_bh(); - } maxelem = h->maxelem; elements = 0; for (e = 0; e < ahash_numof_locks(t->htable_bits); e++) @@ -876,7 +898,6 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext, if (elements >= maxelem && SET_WITH_FORCEADD(set)) forceadd = true; } - rcu_read_unlock_bh(); spin_lock_bh(&t->hregion[r].lock); n = rcu_dereference_bh(hbucket(t, key)); @@ -1003,7 +1024,7 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext, ret = 0; resize: spin_unlock_bh(&t->hregion[r].lock); - if (atomic_read(&t->ref) && ext->target) { + if (t->resizing && ext && ext->target) { /* Resize is in process and kernel side add, save values / struct mtype_resize_ad x; @@ -1017,7 +1038,7 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext, memcpy(&x->mext, mext, sizeof(struct ip_set_ext)); x->flags = flags; spin_lock_bh(&set->lock); - list_add_tail(&x->list, &h->ad); + list_add_tail(&x->list, &t->ad); spin_unlock_bh(&set->lock); } goto out; @@ -1030,7 +1051,7 @@ mtype_add(struct ip_set set, void value, const struct ip_set_ext ext, unlock: spin_unlock_bh(&t->hregion[r].lock); out: - if (atomic_dec_and_test(&t->uref) && atomic_read(&t->ref)) { + if (atomic_dec_and_test(&t->uref) && t->resizing) { pr_debug("Table destroy after resize by add: %p\n", t); mtype_ahash_destroy(set, t, false); } @@ -1093,7 +1114,7 @@ mtype_del(struct ip_set set, void value, const struct ip_set_ext ext, #endif ip_set_ext_destroy(set, data); - if (atomic_read(&t->ref) && ext->target) { + if (t->resizing && ext && ext->target) { / Resize is in process and kernel side del, * save values / @@ -1141,10 +1162,10 @@ mtype_del(struct ip_set set, void value, const struct ip_set_ext ext, spin_unlock_bh(&t->hregion[r].lock); if (x) { spin_lock_bh(&set->lock); - list_add(&x->list, &h->ad); + list_add(&x->list, &t->ad); spin_unlock_bh(&set->lock); } - if (atomic_dec_and_test(&t->uref) && atomic_read(&t->ref)) { + if (atomic_dec_and_test(&t->uref) && t->resizing) { pr_debug("Table destroy after resize by del: %p\n", t); mtype_ahash_destroy(set, t, false); } @@ -1353,7 +1374,7 @@ mtype_uref(struct ip_set set, struct netlink_callback cb, bool start) rcu_read_unlock_bh(); } else if (cb->args[IPSET_CB_PRIVATE]) { t = (struct htable )cb->args[IPSET_CB_PRIVATE]; - if (atomic_dec_and_test(&t->uref) && atomic_read(&t->ref)) { + if (atomic_dec_and_test(&t->uref) && t->resizing) { pr_debug("Table destroy after resize " " by dump: %p\n", t); mtype_ahash_destroy(set, t, false); @@ -1566,7 +1587,13 @@ IPSET_TOKEN(HTYPE, _create)(struct net net, struct ip_set set, if (tb[IPSET_ATTR_MAXELEM]) maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]); - hsize = sizeof(h); +#ifdef IP_SET_PROTO_UNDEF + hsize = sizeof(struct htype); +#else + hsize = set->family == NFPROTO_IPV6 ? + sizeof(struct IPSET_TOKEN(HTYPE, 6)) : + sizeof(struct IPSET_TOKEN(HTYPE, 4)); +#endif h = kzalloc(hsize, GFP_KERNEL); if (!h) return -ENOMEM; @@ -1593,6 +1620,7 @@ IPSET_TOKEN(HTYPE, _create)(struct net net, struct ip_set set, return -ENOMEM; } h->gc.set = set; + spin_lock_init(&h->gc.lock); for (i = 0; i < ahash_numof_locks(hbits); i++) spin_lock_init(&t->hregion[i].lock); h->maxelem = maxelem; @@ -1619,9 +1647,8 @@ IPSET_TOKEN(HTYPE, _create)(struct net net, struct ip_set set, } t->htable_bits = hbits; t->maxelem = h->maxelem / ahash_numof_locks(hbits); + INIT_LIST_HEAD(&t->ad); RCU_INIT_POINTER(h->table, t); - - INIT_LIST_HEAD(&h->ad); set->data = h; #ifndef IP_SET_PROTO_UNDEF if (set->family == NFPROTO_IPV4) { diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c index 906f2c36167638..35cbe821c25967 100644 --- a/net/netfilter/ipvs/ip_vs_core.c +++ b/net/netfilter/ipvs/ip_vs_core.c @@ -398,10 +398,10 @@ ip_vs_conn_stats(struct ip_vs_conn cp, struct ip_vs_service svc) static inline void ip_vs_set_state(struct ip_vs_conn cp, int direction, const struct sk_buff skb, - struct ip_vs_proto_data pd) + struct ip_vs_proto_data pd, unsigned int iph_len) { if (likely(pd->pp->state_transition)) - pd->pp->state_transition(cp, direction, skb, pd); + pd->pp->state_transition(cp, direction, skb, pd, iph_len); } static inline int @@ -803,7 +803,7 @@ int ip_vs_leave(struct ip_vs_service svc, struct sk_buff skb, ip_vs_in_stats(cp, skb); /* set state / - ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); + ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd, iph->len); / transmit the first SYN packet / ret = cp->packet_xmit(skb, cp, pd->pp, iph); @@ -1484,7 +1484,7 @@ handle_response(int af, struct sk_buff skb, struct ip_vs_proto_data pd, after_nat: ip_vs_out_stats(cp, skb); - ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd); + ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd, iph->len); skb->ipvs_property = 1; if (!(cp->flags & IP_VS_CONN_F_NFCT)) ip_vs_notrack(skb); @@ -1767,6 +1767,7 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related, bool tunnel, new_cp = false; union nf_inet_addr raddr; char outer_proto = "IPIP"; + unsigned int hlen_ipip; int ulen = 0; related = 1; @@ -1804,9 +1805,10 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related, /* Now find the contained IP header / offset += sizeof(_icmph); cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); - if (cih == NULL) + if (!(cih && cih->version == 4 && cih->ihl >= 5)) return NF_ACCEPT; / The packet looks wrong, ignore / raddr = (union nf_inet_addr )&cih->daddr; + hlen_ipip = cih->ihl * 4; /* Special case for errors for IPIP/UDP/GRE tunnel packets / tunnel = false; @@ -1822,9 +1824,9 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related, /* Only for known tunnel / if (!dest \|\| dest->tun_type != IP_VS_CONN_F_TUNNEL_TYPE_IPIP) return NF_ACCEPT; - offset += cih->ihl 4; + offset += hlen_ipip; cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); - if (cih == NULL) + if (!(cih && cih->version == 4 && cih->ihl >= 5)) return NF_ACCEPT; /* The packet looks wrong, ignore / tunnel = true; } else if ((cih->protocol == IPPROTO_UDP \|\| / Can be UDP encap / @@ -1836,7 +1838,7 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related, /* Non-first fragment has no UDP/GRE header / if (unlikely(cih->frag_off & htons(IP_OFFSET))) return NF_ACCEPT; - offset2 = offset + cih->ihl 4; + offset2 = offset + hlen_ipip; if (cih->protocol == IPPROTO_UDP) { ulen = ipvs_udp_decap(ipvs, skb, offset2, AF_INET, raddr, &iproto); @@ -1905,6 +1907,7 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related, } if (tunnel) { + unsigned int hlen_orig = cih->ihl 4; __be32 info = ic->un.gateway; __u8 type = ic->type; __u8 code = ic->code; @@ -1921,6 +1924,9 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related, goto ignore_tunnel; offset2 -= ihl + sizeof(_icmph); skb_reset_network_header(skb); + / Ensure the IP header is present in headroom / + if (!pskb_may_pull(skb, hlen_ipip)) + goto ignore_tunnel; IP_VS_DBG(12, "ICMP for %s %pI4->%pI4: mtu=%u\n", outer_proto, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu); @@ -1936,8 +1942,8 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related, if (dest_dst) mtu = dst_mtu(dest_dst->dst_cache); } - if (mtu > 68 + sizeof(struct iphdr) + ulen) - mtu -= sizeof(struct iphdr) + ulen; + if (mtu > 68 + hlen_ipip + ulen) + mtu -= hlen_ipip + ulen; info = htonl(mtu); } /* Strip outer IP, ICMP and IPIP/UDP/GRE, go to IP header of @@ -1946,6 +1952,9 @@ ip_vs_in_icmp(struct netns_ipvs ipvs, struct sk_buff skb, int related, if (pskb_pull(skb, offset2) == NULL) goto ignore_tunnel; skb_reset_network_header(skb); + / Ensure the IP header is present in headroom / + if (!pskb_may_pull(skb, hlen_orig)) + goto ignore_tunnel; IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n", &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, type, code, ntohl(info)); @@ -2233,7 +2242,7 @@ ip_vs_in_hook(void priv, struct sk_buff skb, const struct nf_hook_state state IP_VS_DBG_PKT(11, af, pp, skb, iph.off, "Incoming packet"); ip_vs_in_stats(cp, skb); - ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); + ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd, iph.len); if (cp->packet_xmit) ret = cp->packet_xmit(skb, cp, pp, &iph); /* do not touch skb anymore / diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c index 63c78a1f3918a7..c67317be17dfaf 100644 --- a/net/netfilter/ipvs/ip_vs_proto_sctp.c +++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c @@ -372,20 +372,15 @@ static const char sctp_state_name(int state) static inline void set_sctp_state(struct ip_vs_proto_data pd, struct ip_vs_conn cp, - int direction, const struct sk_buff skb) + int direction, const struct sk_buff skb, + unsigned int iph_len) { struct sctp_chunkhdr _sctpch, sch; unsigned char chunk_type; int event, next_state; - int ihl, cofs; + int cofs; -#ifdef CONFIG_IP_VS_IPV6 - ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr); -#else - ihl = ip_hdrlen(skb); -#endif - - cofs = ihl + sizeof(struct sctphdr); + cofs = iph_len + sizeof(struct sctphdr); sch = skb_header_pointer(skb, cofs, sizeof(_sctpch), &_sctpch); if (sch == NULL) return; @@ -468,10 +463,11 @@ set_sctp_state(struct ip_vs_proto_data pd, struct ip_vs_conn cp, static void sctp_state_transition(struct ip_vs_conn cp, int direction, - const struct sk_buff skb, struct ip_vs_proto_data pd) + const struct sk_buff skb, struct ip_vs_proto_data pd, + unsigned int iph_len) { spin_lock_bh(&cp->lock); - set_sctp_state(pd, cp, direction, skb); + set_sctp_state(pd, cp, direction, skb, iph_len); spin_unlock_bh(&cp->lock); } diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c index 8cc0a8ce624112..f86b763efcc4dc 100644 --- a/net/netfilter/ipvs/ip_vs_proto_tcp.c +++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c @@ -579,17 +579,12 @@ set_tcp_state(struct ip_vs_proto_data pd, struct ip_vs_conn cp, static void tcp_state_transition(struct ip_vs_conn cp, int direction, const struct sk_buff skb, - struct ip_vs_proto_data pd) + struct ip_vs_proto_data pd, + unsigned int iph_len) { struct tcphdr _tcph, th; -#ifdef CONFIG_IP_VS_IPV6 - int ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr); -#else - int ihl = ip_hdrlen(skb); -#endif - - th = skb_header_pointer(skb, ihl, sizeof(_tcph), &_tcph); + th = skb_header_pointer(skb, iph_len, sizeof(_tcph), &_tcph); if (th == NULL) return; diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c index f9de632e38cdd6..58f9e255927e2e 100644 --- a/net/netfilter/ipvs/ip_vs_proto_udp.c +++ b/net/netfilter/ipvs/ip_vs_proto_udp.c @@ -444,7 +444,8 @@ static const char udp_state_name(int state) static void udp_state_transition(struct ip_vs_conn cp, int direction, const struct sk_buff skb, - struct ip_vs_proto_data pd) + struct ip_vs_proto_data pd, + unsigned int iph_len) { if (unlikely(!pd)) { pr_err("UDP no ns data\n"); diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c index 99c5b9d671a0ca..2a829b5e8240a7 100644 --- a/net/netfilter/nf_flow_table_core.c +++ b/net/netfilter/nf_flow_table_core.c @@ -127,12 +127,18 @@ static int flow_offload_fill_route(struct flow_offload flow, switch (route->tuple[dir].xmit_type) { case FLOW_OFFLOAD_XMIT_DIRECT: + if (flow_tuple->tun_num) { + flow_tuple->dst_cache = dst; + flow_tuple->dst_cookie = + flow_offload_dst_cookie(flow_tuple); + } memcpy(flow_tuple->out.h_dest, route->tuple[dir].out.h_dest, ETH_ALEN); memcpy(flow_tuple->out.h_source, route->tuple[dir].out.h_source, ETH_ALEN); flow_tuple->out.ifidx = route->tuple[dir].out.ifindex; - dst_release(dst); + if (!flow_tuple->tun_num) + dst_release(dst); break; case FLOW_OFFLOAD_XMIT_XFRM: case FLOW_OFFLOAD_XMIT_NEIGH: @@ -152,9 +158,7 @@ static int flow_offload_fill_route(struct flow_offload flow, static void nft_flow_dst_release(struct flow_offload flow, enum flow_offload_tuple_dir dir) { - if (flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH \|\| - flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM) - dst_release(flow->tuplehash[dir].tuple.dst_cache); + dst_release(flow->tuplehash[dir].tuple.dst_cache); } void flow_offload_route_init(struct flow_offload flow, @@ -345,10 +349,8 @@ int flow_offload_add(struct nf_flowtable flow_table, struct flow_offload flow) nf_ct_refresh(flow->ct, NF_CT_DAY); - if (nf_flowtable_hw_offload(flow_table)) { - __set_bit(NF_FLOW_HW, &flow->flags); + if (nf_flowtable_hw_offload(flow_table)) nf_flow_offload_add(flow_table, flow); - } return 0; } @@ -369,7 +371,8 @@ void flow_offload_refresh(struct nf_flowtable flow_table, test_bit(NF_FLOW_CLOSING, &flow->flags)) return; - nf_flow_offload_add(flow_table, flow); + if (test_bit(NF_FLOW_HW, &flow->flags)) + nf_flow_offload_refresh(flow_table, flow); } EXPORT_SYMBOL_GPL(flow_offload_refresh); diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c index 29e93ac1e2e400..0b78decce8a9bd 100644 --- a/net/netfilter/nf_flow_table_ip.c +++ b/net/netfilter/nf_flow_table_ip.c @@ -299,8 +299,7 @@ static bool nf_flow_exceeds_mtu(const struct sk_buff skb, unsigned int mtu) static inline bool nf_flow_dst_check(struct flow_offload_tuple tuple) { - if (tuple->xmit_type != FLOW_OFFLOAD_XMIT_NEIGH && - tuple->xmit_type != FLOW_OFFLOAD_XMIT_XFRM) + if (!tuple->dst_cache) return true; return dst_check(tuple->dst_cache, tuple->dst_cookie); @@ -590,10 +589,10 @@ static int nf_flow_pppoe_push(struct sk_buff skb, u16 id, static int nf_flow_tunnel_ipip_push(struct net net, struct sk_buff skb, struct flow_offload_tuple tuple, - __be32 ip_daddr) + struct dst_entry dst, __be32 ip_daddr) { struct iphdr iph = (struct iphdr )skb_network_header(skb); - struct rtable rt = dst_rtable(tuple->dst_cache); + struct rtable rt = dst_rtable(dst); u8 tos = iph->tos, ttl = iph->ttl; __be16 frag_off = iph->frag_off; u32 headroom = sizeof(iph); @@ -636,21 +635,22 @@ static int nf_flow_tunnel_ipip_push(struct net net, struct sk_buff skb, static int nf_flow_tunnel_v4_push(struct net net, struct sk_buff skb, struct flow_offload_tuple tuple, - __be32 ip_daddr) + struct dst_entry dst, __be32 ip_daddr) { if (tuple->tun_num) - return nf_flow_tunnel_ipip_push(net, skb, tuple, ip_daddr); + return nf_flow_tunnel_ipip_push(net, skb, tuple, dst, ip_daddr); return 0; } static int nf_flow_tunnel_ip6ip6_push(struct net net, struct sk_buff skb, struct flow_offload_tuple tuple, + struct dst_entry dst, struct in6_addr ip6_daddr) { struct ipv6hdr ip6h = (struct ipv6hdr )skb_network_header(skb); - struct rtable rt = dst_rtable(tuple->dst_cache); __u8 dsfield = ipv6_get_dsfield(ip6h); + struct rtable rt = dst_rtable(dst); struct flowi6 fl6 = { .daddr = tuple->tun.src_v6, .saddr = tuple->tun.dst_v6, @@ -696,10 +696,11 @@ static int nf_flow_tunnel_ip6ip6_push(struct net net, struct sk_buff skb, static int nf_flow_tunnel_v6_push(struct net net, struct sk_buff skb, struct flow_offload_tuple tuple, + struct dst_entry dst, struct in6_addr ip6_daddr) { if (tuple->tun_num) - return nf_flow_tunnel_ip6ip6_push(net, skb, tuple, ip6_daddr); + return nf_flow_tunnel_ip6ip6_push(net, skb, tuple, dst, ip6_daddr); return 0; } @@ -842,7 +843,8 @@ nf_flow_offload_ip_hook(void priv, struct sk_buff skb, other_tuple = &flow->tuplehash[!dir].tuple; ip_daddr = other_tuple->src_v4.s_addr; - if (nf_flow_tunnel_v4_push(state->net, skb, other_tuple, &ip_daddr) < 0) + if (nf_flow_tunnel_v4_push(state->net, skb, other_tuple, + tuplehash->tuple.dst_cache, &ip_daddr) < 0) return NF_DROP; switch (tuplehash->tuple.xmit_type) { @@ -1158,6 +1160,7 @@ nf_flow_offload_ipv6_hook(void priv, struct sk_buff skb, ip6_daddr = &other_tuple->src_v6; if (nf_flow_tunnel_v6_push(state->net, skb, other_tuple, + tuplehash->tuple.dst_cache, &ip6_daddr) < 0) return NF_DROP; diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c index 002ec15d988bdb..801a3dd9ceea3d 100644 --- a/net/netfilter/nf_flow_table_offload.c +++ b/net/netfilter/nf_flow_table_offload.c @@ -1101,9 +1101,17 @@ nf_flow_offload_work_alloc(struct nf_flowtable flowtable, return offload; } +static bool nf_flow_offload_unsupported(struct flow_offload flow) +{ + if (flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.tun_num \|\| + flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.tun_num) + return true; -void nf_flow_offload_add(struct nf_flowtable flowtable, - struct flow_offload flow) + return false; +} + +void nf_flow_offload_refresh(struct nf_flowtable flowtable, + struct flow_offload flow) { struct flow_offload_work offload; @@ -1114,6 +1122,16 @@ void nf_flow_offload_add(struct nf_flowtable flowtable, flow_offload_queue_work(offload); } +void nf_flow_offload_add(struct nf_flowtable flowtable, + struct flow_offload flow) +{ + if (nf_flow_offload_unsupported(flow)) + return; + + set_bit(NF_FLOW_HW, &flow->flags); + nf_flow_offload_refresh(flowtable, flow); +} + void nf_flow_offload_del(struct nf_flowtable flowtable, struct flow_offload flow) { diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index fa36575998616f..5fee61b3813cbc 100644 --- a/net/netfilter/nfnetlink_log.c +++ b/net/netfilter/nfnetlink_log.c @@ -676,7 +676,7 @@ __build_packet_message(struct nfnl_log_net log, goto nla_put_failure; if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) - BUG(); + goto nla_put_failure; } nlh->nlmsg_len = inst->skb->tail - old_tail; @@ -698,6 +698,21 @@ static const struct nf_loginfo default_loginfo = { }, }; +static unsigned int nfulnl_get_copy_len(const struct nf_loginfo li, + const struct sk_buff skb, + unsigned int copy_len) +{ + unsigned int len = skb->len; + + if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) && + li->u.ulog.copy_len < copy_len) + copy_len = li->u.ulog.copy_len; + if (!skb_frags_readable(skb)) + len = skb_headlen(skb); + + return min(len, copy_len); +} + /* log handler for internal netfilter logging api / static void nfulnl_log_packet(struct net net, @@ -790,14 +805,7 @@ nfulnl_log_packet(struct net net, break; case NFULNL_COPY_PACKET: - data_len = inst->copy_range; - if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) && - (li->u.ulog.copy_len < data_len)) - data_len = li->u.ulog.copy_len; - - if (data_len > skb->len) - data_len = skb->len; - + data_len = nfulnl_get_copy_len(li, skb, inst->copy_range); size += nla_total_size(data_len); break; diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index 35d4c6c628ffc1..b8aaf39cb4d8ea 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -690,6 +690,17 @@ static int nfqnl_put_master_ifindex(struct sk_buff nlskb, int attr, } #endif +static unsigned int nfqnl_get_data_len(const struct sk_buff entskb, + unsigned int copy_range) +{ + unsigned int data_len = entskb->len; + + if (!skb_frags_readable(entskb)) + data_len = skb_headlen(entskb); + + return min(data_len, copy_range); +} + static struct sk_buff nfqnl_build_packet_message(struct net net, struct nfqnl_instance queue, struct nf_queue_entry entry, @@ -755,10 +766,7 @@ nfqnl_build_packet_message(struct net net, struct nfqnl_instance queue, nf_queue_checksum_help(entskb)) return NULL; - data_len = READ_ONCE(queue->copy_range); - if (data_len > entskb->len) - data_len = entskb->len; - + data_len = nfqnl_get_data_len(entskb, READ_ONCE(queue->copy_range)); hlen = skb_zerocopy_headlen(entskb); hlen = min_t(unsigned int, hlen, data_len); size += sizeof(struct nlattr) + hlen; diff --git a/net/netfilter/nft_lookup.c b/net/netfilter/nft_lookup.c index ba512e94b4023f..19887439847d11 100644 --- a/net/netfilter/nft_lookup.c +++ b/net/netfilter/nft_lookup.c @@ -103,13 +103,13 @@ void nft_lookup_eval(const struct nft_expr expr, bool found; ext = nft_set_do_lookup(net, set, &regs->data[priv->sreg]); + if (!ext) + ext = nft_set_catchall_lookup(net, set); + found = !!ext ^ priv->invert; if (!found) { - ext = nft_set_catchall_lookup(net, set); - if (!ext) { - regs->verdict.code = NFT_BREAK; - return; - } + regs->verdict.code = NFT_BREAK; + return; } if (ext) { diff --git a/net/netfilter/xt_u32.c b/net/netfilter/xt_u32.c index ec1a21e3b6e2c3..dabbaa742874cb 100644 --- a/net/netfilter/xt_u32.c +++ b/net/netfilter/xt_u32.c @@ -14,8 +14,8 @@ #include <linux/netfilter/x_tables.h> #include <linux/netfilter/xt_u32.h> -static bool u32_match_it(const struct xt_u32 data, - const struct sk_buff skb) +static int u32_match_it(const struct xt_u32 data, + const struct sk_buff skb) { const struct xt_u32_test ct; unsigned int testind; @@ -40,7 +40,8 @@ static bool u32_match_it(const struct xt_u32 data, return false; if (skb_copy_bits(skb, pos, &n, sizeof(n)) < 0) - BUG(); + return -1; + val = ntohl(n); nnums = ct->nnums; @@ -68,7 +69,7 @@ static bool u32_match_it(const struct xt_u32 data, if (skb_copy_bits(skb, at + pos, &n, sizeof(n)) < 0) - BUG(); + return -1; val = ntohl(n); break; } @@ -90,9 +91,14 @@ static bool u32_match_it(const struct xt_u32 data, static bool u32_mt(const struct sk_buff skb, struct xt_action_param par) { const struct xt_u32 *data = par->matchinfo; - bool ret; + int ret; ret = u32_match_it(data, skb); + if (ret < 0) { + par->hotdrop = true; + return false; + } + return ret ^ data->invert; }
3/2	2026/07/09 06:57	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15817 output: 34 thoughts: 1776 Thoughts: Patch Series Analysis for Netfilter/IPVS Components Alright, let's dive into this patch series. My initial assessment is that we've got a collection of changes spanning several netfilter and IPVS components. My immediate goal is to understand the functional impact and identify areas that might be interesting for fuzzing. 1. IPVS Enhancements: I see that we've got changes to `ip_vs.h` and the protocol-specific files. The key modification is the addition of the `iph_len` argument to the `state_transition` function pointer within the `ip_vs_protocol` struct. This is a solid move, providing the IP header length directly. This propagates through `ip_vs_set_state` and allows the protocol-specific functions to use this value. I notice this is also in `ip_vs_in_icmp`, and the various state transition functions. It appears this fixes potential out-of-bounds reads or length miscalculations by calculating the header length from the skb. The focus for fuzzing will be on `ip_vs_in_icmp`, and the state transition functions, which are the heart of connection tracking and handling. We need to be especially mindful of the tunnel handling. Configs? `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, and `IP_VS_PROTO_SCTP` are all relevant. 2. Flow Table Offload Refinement: Next, the flow table offload changes are substantial. The `flow_offload_tuple` struct is modified with fields moved out of a union, and a new `nf_flow_offload_refresh` function appears. The `dst_cookie` and `dst_cache` usage is now more explicit. The key seems to be in the tunnel handling functions like `nf_flow_tunnel_v4_push` and `nf_flow_tunnel_v6_push` - those are good candidates to examine. The logic in `nf_flow_offload_add` regarding `nf_flow_offload_unsupported` and tunnel configurations also warrants close inspection. The `dst_entry dst` parameter passed to several of the tunnel functions is interesting. The relevant config is `NF_FLOW_TABLE`. 3. EBtables String Handling Improvement:* Moving on to `ebtables.c`, the changes related to string handling seem aimed at preventing out-of-bounds reads. The addition of checks like `strnlen` in `ebt_check_match` and null-termination in several functions like `update_counters` and `compat_copy_ebt_replace_from_user` are very important, in my opinion, in protecting against potential vulnerabilities. I'll need to pay attention to `ebt_check_match` and those string-handling functions. The relevant config is `BRIDGE_NF_EBTABLES`. 4. IPv6 Fragmentation Robustness: `nf_conntrack_reasm.c` gets some attention. Checking `skb_mac_header_was_set(skb)` before incrementing `skb->mac_header` in `nf_ct_frag6_reasm` and handling `skb_copy_bits` failure in `find_prev_fhdr` (returning `-1` instead of `BUG()`) is a good defensive practice. It is likely these changes will allow for less frequent or no panics. The focus will be `nf_ct_frag6_reasm` and `find_prev_fhdr`. The relevant config is `NF_DEFRAG_IPV6`. 5. IP Set Resizing and Garbage Collection: The IP set changes seem focused on the internals, adding a spinlock, a resizing flag, and a list head to `htable`. Several functions, including `mtype_gc`, `mtype_resize`, `mtype_add`, and `mtype_del`, are modified. This is about making GC and resizing thread-safe. Those are good targets to scrutinize, especially for potential race conditions or memory leaks. `IP_SET` is the config we're looking at here. 6. Netlink Logging Reliability: In `nfnetlink_log.c`, the changes relating to `__build_packet_message` returning an error instead of `BUG()` and the addition of `nfulnl_get_copy_len` for handling `skb_frags_readable` are welcome. They make the code more resilient. Focus is `__build_packet_message` and `nfulnl_log_packet`. Config is `NETFILTER_NETLINK_LOG`. 7. Netlink Queue Robustness: `nfnetlink_queue.c` has
4/2	2026/07/09 06:57	tool	grepper	0m Args: { "Expression": "config IP_VS", "PathPrefix": "net/netfilter/ipvs/Kconfig" } Results: { "Output": "net/netfilter/ipvs/Kconfig-4-#\nnet/netfilter/ipvs/Kconfig:5:menuconfig IP_VS\nnet/netfilter/ipvs/Kconfig-6-\ttristate \"IP virtual server support\"\n--\nnet/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n" }
5/2	2026/07/09 06:57	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 18922 output: 103 thoughts: 19 Thoughts: Here's my thought process, summarized as if I were considering these configurations: Checking Network Security Configurations Okay, time to get this network security audit rolling. First things first, I need to make sure everything's set up the way I expect it to be. Let's start with a deep dive into the `ebtables` configuration. I want to understand how the Ethernet bridge filtering is implemented, looking for any potential vulnerabilities or unexpected behavior there. Then, I'll move on to `ipset`. I'm particularly interested in how they're being utilized for things like blacklisting, whitelisting, or rate-limiting. Are they being used effectively, or could they be optimized? Finally, I need to understand what's happening with `nf_flow_table`. How is the flow offload implemented? Are there any potential issues with that? Are there any limitations on the flow table's size or behavior that I need to be aware of? I'll be looking for configuration details, and checking the performance impacts. I need to be sure everything is working as intended, and that I understand what is going on with all of these tools.
6/2	2026/07/09 06:58	tool	grepper	0m Args: { "Expression": "config BRIDGE_NF_EBTABLES", "PathPrefix": "net/bridge/netfilter/Kconfig" } Results: { "Output": "net/bridge/netfilter/Kconfig=28=config NF_CONNTRACK_BRIDGE\n--\nnet/bridge/netfilter/Kconfig-42-# old sockopt interface and eval loop\nnet/bridge/netfilter/Kconfig:43:config BRIDGE_NF_EBTABLES_LEGACY\nnet/bridge/netfilter/Kconfig-44-\ttristate \"Legacy EBTABLES support\"\n--\nnet/bridge/netfilter/Kconfig-52-\nnet/bridge/netfilter/Kconfig:53:menuconfig BRIDGE_NF_EBTABLES\nnet/bridge/netfilter/Kconfig-54-\ttristate \"Ethernet Bridge tables (ebtables) support\"\n" }
7/2	2026/07/09 06:58	tool	grepper	0m Args: { "Expression": "config IP_SET", "PathPrefix": "net/netfilter/ipset/Kconfig" } Results: { "Output": "net/netfilter/ipset/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nnet/netfilter/ipset/Kconfig:2:menuconfig IP_SET\nnet/netfilter/ipset/Kconfig-3-\ttristate \"IP set support\"\n--\nnet/netfilter/ipset/Kconfig=14=if IP_SET\nnet/netfilter/ipset/Kconfig-15-\nnet/netfilter/ipset/Kconfig:16:config IP_SET_MAX\nnet/netfilter/ipset/Kconfig-17-\tint \"Maximum number of IP sets\"\n--\nnet/netfilter/ipset/Kconfig-27-\nnet/netfilter/ipset/Kconfig:28:config IP_SET_BITMAP_IP\nnet/netfilter/ipset/Kconfig-29-\ttristate \"bitmap:ip set support\"\n--\nnet/netfilter/ipset/Kconfig-36-\nnet/netfilter/ipset/Kconfig:37:config IP_SET_BITMAP_IPMAC\nnet/netfilter/ipset/Kconfig-38-\ttristate \"bitmap:ip,mac set support\"\n--\nnet/netfilter/ipset/Kconfig-45-\nnet/netfilter/ipset/Kconfig:46:config IP_SET_BITMAP_PORT\nnet/netfilter/ipset/Kconfig-47-\ttristate \"bitmap:port set support\"\n--\nnet/netfilter/ipset/Kconfig-54-\nnet/netfilter/ipset/Kconfig:55:config IP_SET_HASH_IP\nnet/netfilter/ipset/Kconfig-56-\ttristate \"hash:ip set support\"\n--\nnet/netfilter/ipset/Kconfig-64-\nnet/netfilter/ipset/Kconfig:65:config IP_SET_HASH_IPMARK\nnet/netfilter/ipset/Kconfig-66-\ttristate \"hash:ip,mark set support\"\n--\nnet/netfilter/ipset/Kconfig-73-\nnet/netfilter/ipset/Kconfig:74:config IP_SET_HASH_IPPORT\nnet/netfilter/ipset/Kconfig-75-\ttristate \"hash:ip,port set support\"\n--\nnet/netfilter/ipset/Kconfig-82-\nnet/netfilter/ipset/Kconfig:83:config IP_SET_HASH_IPPORTIP\nnet/netfilter/ipset/Kconfig-84-\ttristate \"hash:ip,port,ip set support\"\n--\nnet/netfilter/ipset/Kconfig-92-\nnet/netfilter/ipset/Kconfig:93:config IP_SET_HASH_IPPORTNET\nnet/netfilter/ipset/Kconfig-94-\ttristate \"hash:ip,port,net set support\"\n--\nnet/netfilter/ipset/Kconfig-102-\nnet/netfilter/ipset/Kconfig:103:config IP_SET_HASH_IPMAC\nnet/netfilter/ipset/Kconfig-104-\ttristate \"hash:ip,mac set support\"\n--\nnet/netfilter/ipset/Kconfig-111-\nnet/netfilter/ipset/Kconfig:112:config IP_SET_HASH_MAC\nnet/netfilter/ipset/Kconfig-113-\ttristate \"hash:mac set support\"\n--\nnet/netfilter/ipset/Kconfig-120-\nnet/netfilter/ipset/Kconfig:121:config IP_SET_HASH_NETPORTNET\nnet/netfilter/ipset/Kconfig-122-\ttristate \"hash:net,port,net set support\"\n--\nnet/netfilter/ipset/Kconfig-129-\nnet/netfilter/ipset/Kconfig:130:config IP_SET_HASH_NET\nnet/netfilter/ipset/Kconfig-131-\ttristate \"hash:net set support\"\n--\nnet/netfilter/ipset/Kconfig-138-\nnet/netfilter/ipset/Kconfig:139:config IP_SET_HASH_NETNET\nnet/netfilter/ipset/Kconfig-140-\ttristate \"hash:net,net set support\"\n--\nnet/netfilter/ipset/Kconfig-147-\nnet/netfilter/ipset/Kconfig:148:config IP_SET_HASH_NETPORT\nnet/netfilter/ipset/Kconfig-149-\ttristate \"hash:net,port set support\"\n--\nnet/netfilter/ipset/Kconfig-157-\nnet/netfilter/ipset/Kconfig:158:config IP_SET_HASH_NETIFACE\nnet/netfilter/ipset/Kconfig-159-\ttristate \"hash:net,iface set support\"\n--\nnet/netfilter/ipset/Kconfig-167-\nnet/netfilter/ipset/Kconfig:168:config IP_SET_LIST_SET\nnet/netfilter/ipset/Kconfig-169-\ttristate \"list:set set support\"\n" }
8/2	2026/07/09 06:58	tool	grepper	0m Args: { "Expression": "config NF_FLOW_TABLE", "PathPrefix": "net/netfilter/Kconfig" } Results: { "Output": "net/netfilter/Kconfig=701=endif # NF_TABLES\nnet/netfilter/Kconfig-702-\nnet/netfilter/Kconfig:703:config NF_FLOW_TABLE_INET\nnet/netfilter/Kconfig-704-\ttristate \"Netfilter flow table mixed IPv4/IPv6 module\"\n--\nnet/netfilter/Kconfig-710-\nnet/netfilter/Kconfig:711:config NF_FLOW_TABLE\nnet/netfilter/Kconfig-712-\ttristate \"Netfilter flow table module\"\n--\nnet/netfilter/Kconfig-720-\nnet/netfilter/Kconfig:721:config NF_FLOW_TABLE_PROCFS\nnet/netfilter/Kconfig-722-\tbool \"Supply flow table statistics in procfs\"\n" }
9/2	2026/07/09 06:58	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 20898 output: 147 thoughts: 32 Thoughts: Here's my take on those configurations: Checking Key Netfilter Configurations Alright, let's dive into this. I need to make sure these crucial Netfilter components are set up correctly. First, `nfnetlink_log`. That one's fundamental – it controls the logging of packets that match Netfilter rules. Gotta ensure it's loaded and configured appropriately to actually give me useful information about what's going on within my network traffic. Next, `nfnetlink_queue`. This is even more critical; it allows for user-space queuing, and that's essential for any advanced packet processing, IDS/IPS, or custom filtering logic I might have running. I need to verify its configuration is as expected. Then there's `xt_u32`. This is the user-space extension for the U32 match. I need this to work since I use it extensively. Its reliability is key. Finally, let's not forget `nf_defrag_ipv6`. IPv6 fragmentation is always a concern. I need to confirm the IPv6 defragmentation module is loaded and functioning to deal with potential fragmentation attacks or just to maintain good network performance. It’s all about maintaining a strong and secure network perimeter!
10/2	2026/07/09 06:58	tool	grepper	0m Args: { "Expression": "config NETFILTER_NETLINK_LOG", "PathPrefix": "net/netfilter/Kconfig" } Results: { "Output": "net/netfilter/Kconfig=54=config NETFILTER_NETLINK_QUEUE\n--\nnet/netfilter/Kconfig-61-\nnet/netfilter/Kconfig:62:config NETFILTER_NETLINK_LOG\nnet/netfilter/Kconfig-63-\ttristate \"Netfilter LOG over NFNETLINK interface\"\n" }
11/2	2026/07/09 06:58	tool	grepper	0m Args: { "Expression": "config NETFILTER_NETLINK_QUEUE", "PathPrefix": "net/netfilter/Kconfig" } Results: { "Output": "net/netfilter/Kconfig=46=config NETFILTER_NETLINK_ACCT\n--\nnet/netfilter/Kconfig-53-\nnet/netfilter/Kconfig:54:config NETFILTER_NETLINK_QUEUE\nnet/netfilter/Kconfig-55-\ttristate \"Netfilter NFQUEUE over NFNETLINK interface\"\n" }
12/2	2026/07/09 06:58	tool	grepper	0m Args: { "Expression": "config NETFILTER_XT_MATCH_U32", "PathPrefix": "net/netfilter/Kconfig" } Results: { "Output": "net/netfilter/Kconfig=1623=config NETFILTER_XT_MATCH_TIME\n--\nnet/netfilter/Kconfig-1636-\nnet/netfilter/Kconfig:1637:config NETFILTER_XT_MATCH_U32\nnet/netfilter/Kconfig-1638-\ttristate '\"u32\" match support'\n" }
13/2	2026/07/09 06:58	tool	grepper	0m Args: { "Expression": "config NF_DEFRAG_IPV6", "PathPrefix": "net/ipv6/netfilter/Kconfig" } Results: { "Output": "net/ipv6/netfilter/Kconfig=300=endmenu\nnet/ipv6/netfilter/Kconfig-301-\nnet/ipv6/netfilter/Kconfig:302:config NF_DEFRAG_IPV6\nnet/ipv6/netfilter/Kconfig-303-\ttristate\n" }
14/2	2026/07/09 06:58	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 21710 output: 40 thoughts: 643 Thoughts: Analyzing Netfilter/IPVS Component Changes Okay, so I'm looking at these changes, and immediately, I see they're hitting a bunch of core netfilter and ipvs components. It's a functional shift, impacting quite a few areas. I need to make sure I understand the full implications. First, I see the configurations that are being affected: `IP_VS`, its TCP, UDP and SCTP protocol support, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, the netlink logging and queueing options and then `NF_TABLES` and the u32 match support. Defragmentation for IPv6 is also in play. Pretty standard suspects for this sort of work. Next, I'm noting the symbols these changes are probably focusing on. I see symbols from IPVS, state transition routines for TCP, UDP and SCTP; flow offload functions, some ebtables symbols, counter updates, fragmentation reassembly, and then, a collection of macros related to message type operations like garbage collection, resize, add and delete. I recognize the commonality with netlink and nftables operations. Right, time to drill down. Let's refine the list. I'm going to drop the counter update symbol and focus on the rest. Hold on... I'm a bit hung up on those message type macros: `mtype_gc`, `mtype_resize`, `mtype_add`, `mtype_del`. Those aren't typical. Are these macros, or perhaps static functions defined in a header? This seems like a detail I need to fully grasp. I'll need to check the ipset headers. Let's look at `net/netfilter/ipset/ip_set_hash_gen.h` to confirm. Aha! Yes, they are indeed static functions defined in a header, expanded via macros. That clarifies things. I now know the nature of their implementation in the source. I'll now do a quick search in the header file.
15/2	2026/07/09 06:59	tool	grepper	0m Args: { "Expression": "mtype_add", "PathPrefix": "net/netfilter/ipset/ip_set_hash_gen.h" } Results: { "Output": "net/netfilter/ipset/ip_set_hash_gen.h=173=static const union nf_inet_addr zeromask = {};\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-204-#undef mtype_ext_cleanup\nnet/netfilter/ipset/ip_set_hash_gen.h:205:#undef mtype_add_cidr\nnet/netfilter/ipset/ip_set_hash_gen.h-206-#undef mtype_del_cidr\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-213-\nnet/netfilter/ipset/ip_set_hash_gen.h:214:#undef mtype_add\nnet/netfilter/ipset/ip_set_hash_gen.h-215-#undef mtype_del\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-249-#define mtype_ext_cleanup\tIPSET_TOKEN(MTYPE, _ext_cleanup)\nnet/netfilter/ipset/ip_set_hash_gen.h:250:#define mtype_add_cidr\t\tIPSET_TOKEN(MTYPE, _add_cidr)\nnet/netfilter/ipset/ip_set_hash_gen.h-251-#define mtype_del_cidr\t\tIPSET_TOKEN(MTYPE, _del_cidr)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-258-\nnet/netfilter/ipset/ip_set_hash_gen.h:259:#define mtype_add\t\tIPSET_TOKEN(MTYPE, _add)\nnet/netfilter/ipset/ip_set_hash_gen.h-260-#define mtype_del\t\tIPSET_TOKEN(MTYPE, _del)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=329=static void\nnet/netfilter/ipset/ip_set_hash_gen.h:330:mtype_add_cidr(struct ip_set set, struct htype h, u8 cidr, u8 n)\nnet/netfilter/ipset/ip_set_hash_gen.h-331-{\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=620=static int\nnet/netfilter/ipset/ip_set_hash_gen.h:621:mtype_add(struct ip_set set, void value, const struct ip_set_ext ext,\nnet/netfilter/ipset/ip_set_hash_gen.h-622-\t struct ip_set_ext mext, u32 flags);\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=632=mtype_resize(struct ip_set set, bool retried)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-784-\t\tif (x-\u003ead == IPSET_ADD) {\nnet/netfilter/ipset/ip_set_hash_gen.h:785:\t\t\tmtype_add(set, \u0026x-\u003ed, \u0026x-\u003eext, \u0026x-\u003emext, x-\u003eflags);\nnet/netfilter/ipset/ip_set_hash_gen.h-786-\t\t} else {\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=867=static int\nnet/netfilter/ipset/ip_set_hash_gen.h:868:mtype_add(struct ip_set set, void value, const struct ip_set_ext ext,\nnet/netfilter/ipset/ip_set_hash_gen.h-869-\t struct ip_set_ext *mext, u32 flags)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-998-\tfor (i = 0; i \u003c IPSET_NET_COUNT; i++)\nnet/netfilter/ipset/ip_set_hash_gen.h:999:\t\tmtype_add_cidr(set, h, NCIDR_PUT(DCIDR_GET(d-\u003ecidr, i)), i);\nnet/netfilter/ipset/ip_set_hash_gen.h-1000-#endif\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=1474=static const struct ip_set_type_variant mtype_variant = {\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-1477-\t.adt\t= {\nnet/netfilter/ipset/ip_set_hash_gen.h:1478:\t\t[IPSET_ADD] = mtype_add,\nnet/netfilter/ipset/ip_set_hash_gen.h-1479-\t\t[IPSET_DEL] = mtype_del,\n" }
16/2	2026/07/09 06:59	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24010 output: 38 thoughts: 148 Thoughts: Analyzing the IPset Code Okay, so I'm looking at this macro and it expands to `IPSET_TOKEN(MTYPE, _add)`. That means the resulting function names are going to be defined by the `MTYPE` variable, appended with `_add`. I can assume that there will be analogous functions named based on different operations as well. So, for the IP hash module, I'll be working with functions like `hash_ip4_add`, `hash_ip6_add`, `hash_net4_add`, `hash_net6_add`, the resizing functions, and garbage collection as well, so `hash_ip4_resize`, `hash_ip6_resize`, `hash_ip4_gc`, and `hash_ip6_gc`, which gives me a good idea of the relevant functions I'll need to focus on. To get a handle on how this actually gets implemented, I should probably take a look at `net/netfilter/ipset/ip_set_hash_ip.c` to see how it's actually instantiated.
17/2	2026/07/09 06:59	tool	grepper	0m Args: { "Expression": "MTYPE", "PathPrefix": "net/netfilter/ipset/ip_set_hash_ip.c" } Results: { "Output": "net/netfilter/ipset/ip_set_hash_ip.c=70=hash_ip4_data_next(struct hash_ip4_elem next, const struct hash_ip4_elem e)\n--\nnet/netfilter/ipset/ip_set_hash_ip.c-74-\nnet/netfilter/ipset/ip_set_hash_ip.c:75:#define MTYPE\t\thash_ip4\nnet/netfilter/ipset/ip_set_hash_ip.c-76-#define HOST_MASK\t32\n--\nnet/netfilter/ipset/ip_set_hash_ip.c=202=hash_ip6_data_next(struct hash_ip6_elem next, const struct hash_ip6_elem e)\n--\nnet/netfilter/ipset/ip_set_hash_ip.c-205-\nnet/netfilter/ipset/ip_set_hash_ip.c:206:#undef MTYPE\nnet/netfilter/ipset/ip_set_hash_ip.c-207-#undef HOST_MASK\nnet/netfilter/ipset/ip_set_hash_ip.c-208-\nnet/netfilter/ipset/ip_set_hash_ip.c:209:#define MTYPE\t\thash_ip6\nnet/netfilter/ipset/ip_set_hash_ip.c-210-#define HOST_MASK\t128\n" }
18/2	2026/07/09 06:59	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24782 output: 37 thoughts: 434 Thoughts: My Analysis of Relevant Symbols and Configurations Okay, let's break this down systematically. I've identified several key symbols that warrant further investigation based on this preliminary pass. Specifically, I'm thinking that `hash_ip4_add`, `hash_ip6_add`, `hash_ip4_resize`, `hash_ip6_resize`, `hash_ip4_gc`, and `hash_ip6_gc` look like prime candidates to delve into, given the context. For `ebtables`, I'll be focusing on `ebt_check_match`, `update_counters`, and `compat_copy_ebt_replace_from_user` as areas that require close scrutiny. With regard to `ipvs`, my attention will be on `ip_vs_in_icmp`, `sctp_state_transition`, `tcp_state_transition`, and `udp_state_transition`. For `nf_flow_table`, I will review `flow_offload_fill_route`, `nf_flow_tunnel_v4_push`, `nf_flow_tunnel_v6_push`, and `nf_flow_offload_add`. I'll be investigating `nf_conntrack_reasm`, `nf_ct_frag6_reasm`, and `find_prev_fhdr`. For `nfnetlink_log`, the functions to look at are `__build_packet_message` and `nfulnl_log_packet`. For `nfnetlink_queue`, the function I will be investigating is `nfqnl_build_packet_message`. And for `nft_lookup`, my focus will be on `nft_lookup_eval`. Lastly, I will need to understand the behavior of the `xt_u32` module, with particular attention to the behavior of `u32_match_it` and `u32_mt`. Now, time to revisit the configurations. I see a familiar set of options: `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32`, and `NF_DEFRAG_IPV6`. Nothing too surprising there. However, I need to confirm whether `IP_SET_HASH_IP` is essential for enabling the hash types. Yes, it looks like `IP_SET_HASH_IP` would be quite relevant.
19/2	2026/07/09 06:59	tool	grepper	0m Args: { "Expression": "config IP_SET_HASH_IP", "PathPrefix": "net/netfilter/ipset/Kconfig" } Results: { "Output": "net/netfilter/ipset/Kconfig=46=config IP_SET_BITMAP_PORT\n--\nnet/netfilter/ipset/Kconfig-54-\nnet/netfilter/ipset/Kconfig:55:config IP_SET_HASH_IP\nnet/netfilter/ipset/Kconfig-56-\ttristate \"hash:ip set support\"\n--\nnet/netfilter/ipset/Kconfig-64-\nnet/netfilter/ipset/Kconfig:65:config IP_SET_HASH_IPMARK\nnet/netfilter/ipset/Kconfig-66-\ttristate \"hash:ip,mark set support\"\n--\nnet/netfilter/ipset/Kconfig-73-\nnet/netfilter/ipset/Kconfig:74:config IP_SET_HASH_IPPORT\nnet/netfilter/ipset/Kconfig-75-\ttristate \"hash:ip,port set support\"\n--\nnet/netfilter/ipset/Kconfig-82-\nnet/netfilter/ipset/Kconfig:83:config IP_SET_HASH_IPPORTIP\nnet/netfilter/ipset/Kconfig-84-\ttristate \"hash:ip,port,ip set support\"\n--\nnet/netfilter/ipset/Kconfig-92-\nnet/netfilter/ipset/Kconfig:93:config IP_SET_HASH_IPPORTNET\nnet/netfilter/ipset/Kconfig-94-\ttristate \"hash:ip,port,net set support\"\n--\nnet/netfilter/ipset/Kconfig-102-\nnet/netfilter/ipset/Kconfig:103:config IP_SET_HASH_IPMAC\nnet/netfilter/ipset/Kconfig-104-\ttristate \"hash:ip,mac set support\"\n" }
20/2	2026/07/09 06:59	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 26274 output: 38 thoughts: 345 Thoughts: My Immediate Task: Implementing IP_SET_HASH_IP Okay, time to get to it. My initial thought is to integrate `IP_SET_HASH_IP`. Given the configuration parameters I'm working with – `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, and, importantly, `IP_SET_HASH_IP` itself, along with the netfilter and bridge utilities, I need to ensure this is seamlessly integrated. We also have `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32`, and `NF_DEFRAG_IPV6` in the mix, so let's keep those in mind. Now, my focus needs to be on these specific symbols: `ip_vs_in_icmp`, `sctp_state_transition`, `tcp_state_transition`, `udp_state_transition`, `flow_offload_fill_route`, `nf_flow_tunnel_v4_push`, `nf_flow_tunnel_v6_push`, `nf_flow_offload_add`, `ebt_check_match`, `update_counters`, `compat_copy_ebt_replace_from_user`, `nf_ct_frag6_reasm`, `find_prev_fhdr`, `hash_ip4_gc`, `hash_ip4_resize`, `hash_ip4_add`, `hash_ip4_del`, `__build_packet_message`, `nfulnl_log_packet`, `nfqnl_build_packet_message`, `nft_lookup_eval`, `u32_match_it`, and `u32_mt`. These represent key functions related to connection tracking, flow offload, and table management within the broader netfilter framework, that will influence the behaviour of this new feature. Hold on a second... `__build_packet_message` is defined as static in `nfnetlink_log.c`. This is something I'll need to double check. That's unusual, and something to be considered as a potential point for interaction or side effects. I'll need to go to `nfnetlink_log.c` and make sure my implementation is compatible. I need to be careful with that.
21/2	2026/07/09 06:59	tool	grepper	0m Args: { "Expression": "__build_packet_message", "PathPrefix": "net/netfilter/nfnetlink_log.c" } Results: { "Output": "net/netfilter/nfnetlink_log.c=473=static inline int\nnet/netfilter/nfnetlink_log.c:474:__build_packet_message(struct nfnl_log_net log,\nnet/netfilter/nfnetlink_log.c-475-\t\t\tstruct nfulnl_instance inst,\n--\nnet/netfilter/nfnetlink_log.c=718=nfulnl_log_packet(struct net *net,\n--\nnet/netfilter/nfnetlink_log.c-831-\nnet/netfilter/nfnetlink_log.c:832:\t__build_packet_message(log, inst, skb, data_len, pf,\nnet/netfilter/nfnetlink_log.c-833-\t\t\t\thooknum, in, out, prefix, plen,\n" }
22/2	2026/07/09 06:59	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 27419 output: 41 thoughts: 63 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience: Analyzing the Netfilter Logging Function Call Right, so we're dealing with `static inline` here. That strongly suggests the function, whatever it is, might be directly inlined into `nfulnl_log_packet`. Therefore, I'm going to focus my analysis on `nfulnl_log_packet` itself. No need to chase the potential inlined code if I can reason about the wrapper. Next, I need to understand how the netlink message is built. I'll need to dig into `nfqnl_build_packet_message` now. I'll take a look at `nfnetlink_queue.c` to understand that piece of code. I think I'll be able to quickly gain an understanding of that function, seeing as I know where to find the source.
23/2	2026/07/09 07:00	tool	grepper	0m Args: { "Expression": "nfqnl_build_packet_message", "PathPrefix": "net/netfilter/nfnetlink_queue.c" } Results: { "Output": "net/netfilter/nfnetlink_queue.c=704=static struct sk_buff \nnet/netfilter/nfnetlink_queue.c:705:nfqnl_build_packet_message(struct net net, struct nfqnl_instance queue,\nnet/netfilter/nfnetlink_queue.c-706-\t\t\t struct nf_queue_entry entry,\n--\nnet/netfilter/nfnetlink_queue.c=974=__nfqnl_enqueue_packet(struct net net, struct nfqnl_instance queue,\n--\nnet/netfilter/nfnetlink_queue.c-981-\nnet/netfilter/nfnetlink_queue.c:982:\tnskb = nfqnl_build_packet_message(net, queue, entry, \u0026packet_id_ptr);\nnet/netfilter/nfnetlink_queue.c-983-\tif (nskb == NULL) {\n" }
24/2	2026/07/09 07:00	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 27956 output: 42 thoughts: 29 Thoughts: Okay, here's my interpretation of those thoughts, presented as a first-person expert summary: Analyzing a Potential Symbolic Representation Right, so this seems like a solid candidate for a good symbolic representation, because it's static and not something that's embedded within a larger context. That's a key distinction; static symbols tend to offer a more stable and reliable foundation for formal reasoning. Inline data, on the other hand, can be more subject to change and interpretation, making it less ideal for, say, formal proofs or model-checking. I'm focusing on "good symbol" specifically in the context of formal methods; there are certainly other definitions out there. Now, let's take a look at the `hash_ip4_gc` function or data structure. This is a very likely place to start, given the context. Knowing the precise nature of the symbol in question is key to validating the conclusion that it is a good symbol.
25/2	2026/07/09 07:00	tool	grepper	0m Error: no matches Args: { "Expression": "hash_ip4_gc", "PathPrefix": "net/netfilter/ipset/ip_set_hash_ip.c" } Results: { "error": "no matches" }
26/2	2026/07/09 07:00	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 28243 output: 40 thoughts: 49 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience: Investigating a Potential Hash Table Implementation Right, so `mtype_gc`... that seems to expand to `hash_ip4_gc`. I need to confirm this assumption quickly. Let me go straight to the source. Specifically, I should check the include file `net/netfilter/ipset/ip_set_hash_gen.h`. That's where the definition for `mtype_gc` should reside if my initial guess is correct. I’m thinking there might be something interesting to review in that header.
27/2	2026/07/09 07:00	tool	grepper	0m Args: { "Expression": "mtype_gc", "PathPrefix": "net/netfilter/ipset/ip_set_hash_gen.h" } Results: { "Output": "net/netfilter/ipset/ip_set_hash_gen.h=173=static const union nf_inet_addr zeromask = {};\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-223-#undef mtype_list\nnet/netfilter/ipset/ip_set_hash_gen.h:224:#undef mtype_gc_do\nnet/netfilter/ipset/ip_set_hash_gen.h:225:#undef mtype_gc\nnet/netfilter/ipset/ip_set_hash_gen.h:226:#undef mtype_gc_init\nnet/netfilter/ipset/ip_set_hash_gen.h-227-#undef mtype_cancel_gc\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-268-#define mtype_list\t\tIPSET_TOKEN(MTYPE, _list)\nnet/netfilter/ipset/ip_set_hash_gen.h:269:#define mtype_gc_do\t\tIPSET_TOKEN(MTYPE, _gc_do)\nnet/netfilter/ipset/ip_set_hash_gen.h:270:#define mtype_gc\t\tIPSET_TOKEN(MTYPE, _gc)\nnet/netfilter/ipset/ip_set_hash_gen.h:271:#define mtype_gc_init\t\tIPSET_TOKEN(MTYPE, _gc_init)\nnet/netfilter/ipset/ip_set_hash_gen.h-272-#define mtype_cancel_gc\t\tIPSET_TOKEN(MTYPE, _cancel_gc)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=489=static void\nnet/netfilter/ipset/ip_set_hash_gen.h:490:mtype_gc_do(struct ip_set set, struct htype h, struct htable t, u32 r)\nnet/netfilter/ipset/ip_set_hash_gen.h-491-{\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=563=static void\nnet/netfilter/ipset/ip_set_hash_gen.h:564:mtype_gc(struct work_struct work)\nnet/netfilter/ipset/ip_set_hash_gen.h-565-{\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-591-\tif (!t-\u003eresizing)\nnet/netfilter/ipset/ip_set_hash_gen.h:592:\t\tmtype_gc_do(set, h, t, r);\nnet/netfilter/ipset/ip_set_hash_gen.h-593-\tspin_unlock_bh(\u0026gc-\u003elock);\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=604=static void\nnet/netfilter/ipset/ip_set_hash_gen.h:605:mtype_gc_init(struct htable_gc gc)\nnet/netfilter/ipset/ip_set_hash_gen.h-606-{\nnet/netfilter/ipset/ip_set_hash_gen.h:607:\tINIT_DEFERRABLE_WORK(\u0026gc-\u003edwork, mtype_gc);\nnet/netfilter/ipset/ip_set_hash_gen.h-608-\tqueue_delayed_work(system_power_efficient_wq, \u0026gc-\u003edwork, HZ);\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=868=mtype_add(struct ip_set set, void value, const struct ip_set_ext ext,\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-892-\t\tif (SET_WITH_TIMEOUT(set))\nnet/netfilter/ipset/ip_set_hash_gen.h:893:\t\t\tmtype_gc_do(set, h, t, r);\nnet/netfilter/ipset/ip_set_hash_gen.h-894-\t\tmaxelem = h-\u003emaxelem;\n" }
28/2	2026/07/09 07:00	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 29470 output: 33 thoughts: 446 Thoughts: Reviewing Kernel Module Dependencies Okay, so I'm looking at `mtype_gc`, which I recall expands to things like `hash_ip4_gc` and `hash_ip6_gc`. Just to be sure, I need to double-check `net/netfilter/ipset/ip_set_hash_ip.c` again. My initial thought is that the functions may not be directly exported, but perhaps they're instantiated. The quickest way to confirm this is to either check the `nm` output, or just focus on those macro names. Alright, `hash_ip4_gc`, `hash_ip4_resize`, `hash_ip4_add`, and `hash_ip4_del` all look promising. I'll need to remember to include their IPv6 counterparts too: `hash_ip6_gc`, `hash_ip6_resize`, `hash_ip6_add`, and `hash_ip6_del`. Now, let's circle back to the configuration options to make sure all dependencies are covered. I need to make sure I consider: `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, `IP_SET_HASH_IP`, `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32`, and `NF_DEFRAG_IPV6`. Right, let's verify that `IP_SET_HASH_IP` is sufficient for testing changes related to `ip_set_hash_gen.h`. Yes, since `ip_set_hash_ip.c` includes `ip_set_hash_gen.h`, that confirms it. Next, I need to confirm that `BRIDGE_NF_EBTABLES` is enough for testing `ebtables.c`. Yep, it looks like it is. Finally, I need to make sure `NF_FLOW_TABLE` is sufficient to test `nf_flow_table_core.c`, `nf_flow_table_ip.c`, and `nf_flow_table_offload.c`. Yes, it should be, that makes sense. Just one final question. I should check if `NF_FLOW_TABLE_INET` is actually needed here. It looks like `nf_flow_table_ip.c` should be compiled when `NF_FLOW_TABLE_INET` is enabled, so I think I'm good.
29/2	2026/07/09 07:01	tool	grepper	0m Args: { "Expression": "nf_flow_table_ip", "PathPrefix": "net/netfilter/Makefile" } Results: { "Output": "net/netfilter/Makefile=142=obj-$(CONFIG_NF_FLOW_TABLE)\t+= nf_flow_table.o\nnet/netfilter/Makefile:143:nf_flow_table-objs\t\t:= nf_flow_table_core.o nf_flow_table_ip.o \\\nnet/netfilter/Makefile-144-\t\t\t\t nf_flow_table_path.o \\\n" }
30/2	2026/07/09 07:01	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 30630 output: 34 thoughts: 51 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: NF_FLOW_TABLE Deduction and Code Dive Right, so I'm dealing with `nf_flow_table_ip.o` and my immediate thought is that this clearly falls under the umbrella of `nf_flow_table`. The relationship is apparent, which means just referencing `NF_FLOW_TABLE` in the current context should cover what I need. No need for anything more granular at this point. Now, let's drill down and see how this all connects. The next logical step is to dive into the `nf_flow_table_offload.c` source. I want to see how the offloading mechanisms are implemented in detail, to assess how all the components interact. This code is the key to understanding the interplay between the IP-specific and more general flow table functionality.
31/2	2026/07/09 07:01	tool	grepper	0m Args: { "Expression": "nf_flow_table_offload", "PathPrefix": "net/netfilter/Makefile" } Results: { "Output": "net/netfilter/Makefile=143=nf_flow_table-objs\t\t:= nf_flow_table_core.o nf_flow_table_ip.o \\\nnet/netfilter/Makefile-144-\t\t\t\t nf_flow_table_path.o \\\nnet/netfilter/Makefile:145:\t\t\t\t nf_flow_table_offload.o nf_flow_table_xdp.o\nnet/netfilter/Makefile-146-nf_flow_table-$(CONFIG_NF_FLOW_TABLE_PROCFS) += nf_flow_table_procfs.o\n" }
32/2	2026/07/09 07:01	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31054 output: 31 thoughts: 28 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: Diving into the Flow Table Right, so we're dealing with something related to the `nf_flow_table`, specifically within the Netfilter framework. The context screams that, so let's start there. My gut says this has some interplay with the logging capabilities. That means the next logical point of investigation is `nfnetlink_log.c`. That file is the most likely candidate. Let's see what's what.
33/2	2026/07/09 07:01	tool	grepper	0m Args: { "Expression": "nfnetlink_log", "PathPrefix": "net/netfilter/Makefile" } Results: { "Output": "net/netfilter/Makefile=28=obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o\nnet/netfilter/Makefile:29:obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o\nnet/netfilter/Makefile-30-obj-$(CONFIG_NETFILTER_NETLINK_OSF) += nfnetlink_osf.o\n" }
34/2	2026/07/09 07:01	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31339 output: 31 thoughts: 28 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Kernel-Level Logging with nfnetlink_queue Alright, yep, `NETFILTER_NETLINK_LOG` should absolutely be sufficient for the task at hand. No need to overcomplicate things; this seems like the direct route. Now, let's just make sure, let's double-check the implementation details and refresh my memory on the interactions. I'll need to dive into `nfnetlink_queue.c` to confirm my understanding of the internals.
35/2	2026/07/09 07:02	tool	grepper	0m Args: { "Expression": "nfnetlink_queue", "PathPrefix": "net/netfilter/Makefile" } Results: { "Output": "net/netfilter/Makefile=27=obj-$(CONFIG_NETFILTER_NETLINK_ACCT) += nfnetlink_acct.o\nnet/netfilter/Makefile:28:obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o\nnet/netfilter/Makefile-29-obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o\n" }
36/2	2026/07/09 07:02	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31627 output: 29 thoughts: 26 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: Confirmation and Initial Approach Alright, yep, confirming that `NETFILTER_NETLINK_QUEUE` is the right avenue here. We're looking at the core of the problem, and this appears to be the appropriate netlink queue. Good, good. Now, let's dive into the guts of this implementation. Where's the heart of the matter? Time to crack open `nft_lookup.c` and see how it all hangs together. This is where the magic (or the problems) likely resides. Let's see how they're handling the interaction with the queue and the specific lookup process.
37/2	2026/07/09 07:02	tool	grepper	0m Args: { "Expression": "nft_lookup", "PathPrefix": "net/netfilter/Makefile" } Results: { "Output": "net/netfilter/Makefile=87=nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \\\nnet/netfilter/Makefile-88-\t\t nf_tables_trace.o nft_immediate.o nft_cmp.o nft_range.o \\\nnet/netfilter/Makefile:89:\t\t nft_bitwise.o nft_byteorder.o nft_payload.o nft_lookup.o \\\nnet/netfilter/Makefile-90-\t\t nft_dynset.o nft_meta.o nft_rt.o nft_exthdr.o nft_last.o \\\n" }
38/2	2026/07/09 07:02	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31996 output: 31 thoughts: 25 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: Quick NF_TABLES Assessment Right, `NF_TABLES`. That's the key. Yes, based on the context, I think it's sufficient for what we need to accomplish. No need to go deeper into other kernel subsystems for this particular problem. Now, let's take a quick look at `xt_u32.c`. I need to refresh my memory on the specifics of that module and how it interacts with the rest of the Netfilter framework to confirm my understanding and make sure there are no obvious gotchas I'm missing. Time to dive into the code...
39/2	2026/07/09 07:02	tool	grepper	0m Args: { "Expression": "xt_u32", "PathPrefix": "net/netfilter/Makefile" } Results: { "Output": "net/netfilter/Makefile=232=obj-$(CONFIG_NETFILTER_XT_MATCH_TIME) += xt_time.o\nnet/netfilter/Makefile:233:obj-$(CONFIG_NETFILTER_XT_MATCH_U32) += xt_u32.o\nnet/netfilter/Makefile-234-\n" }
40/2	2026/07/09 07:02	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32292 output: 37 thoughts: 34 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Kernel Module Design Validation Alright, so the initial thought was pretty clear: confirming that `NETFILTER_XT_MATCH_U32` offers sufficient capability for the current module's needs. We're satisfied with that piece, which makes sense. Now, the next logical step, and what I'm already mentally reaching for, is to immediately dive into `nf_conntrack_reasm.c`. My concern, as always when working with connection tracking, is potential interactions and side effects. I want to thoroughly examine that module for any existing reassembly logic and, specifically, how it handles fragmented packets. We need to be absolutely sure our implementation plays nicely with the existing connection tracking infrastructure, and doesn't introduce any unforeseen issues or conflicts with the reassembly process. Gotta make sure we're not stepping on any toes there. This is a critical point for ensuring the stability and performance of the module.
41/2	2026/07/09 07:02	tool	grepper	0m Args: { "Expression": "nf_conntrack_reasm", "PathPrefix": "net/ipv6/netfilter/Makefile" } Results: { "Output": "net/ipv6/netfilter/Makefile=12=obj-$(CONFIG_IP6_NF_NAT) += ip6table_nat.o\n--\nnet/ipv6/netfilter/Makefile-14-# defrag\nnet/ipv6/netfilter/Makefile:15:nf_defrag_ipv6-y := nf_defrag_ipv6_hooks.o nf_conntrack_reasm.o\nnet/ipv6/netfilter/Makefile-16-obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o\n" }
42/2	2026/07/09 07:02	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32721 output: 34 thoughts: 32 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: IPv6 Fragmentation Consideration Alright, based on what I've been mulling over, it's pretty clear that `NF_DEFRAG_IPV6` is, in fact, the appropriate Netfilter hook for what I'm dealing with. That's a solid starting point. Now, to be absolutely certain and ensure I haven't missed any edge cases or implications, I need to dig into the relevant kernel code. Specifically, I'll start with `ip_vs_core.c` and any other modules or files that handle IPv6 and connection tracking. I need to understand how the fragmentation process interacts with those components. My goal is to confirm how the hook is being utilized and if any other related logic needs to be accounted for.
43/2	2026/07/09 07:02	tool	grepper	0m Args: { "Expression": "ip_vs_core", "PathPrefix": "net/netfilter/ipvs/Makefile" } Results: { "Output": "net/netfilter/ipvs/Makefile=14=ip_vs-extra_objs-$(CONFIG_IP_VS_NFCT) += ip_vs_nfct.o\nnet/netfilter/ipvs/Makefile-15-\nnet/netfilter/ipvs/Makefile:16:ip_vs-objs :=\tip_vs_conn.o ip_vs_core.o ip_vs_ctl.o ip_vs_sched.o\t \\\nnet/netfilter/ipvs/Makefile-17-\t\tip_vs_xmit.o ip_vs_app.o ip_vs_sync.o\t \t\t \\\n" }
44/2	2026/07/09 07:02	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 33127 output: 38 thoughts: 31 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Examining the IPVS Landscape Right, `IP_VS` will do the trick. That’s the initial assessment, and it feels right given the context. Now, to be absolutely certain and to solidify the architecture, I'll need to dig into the implementation details. Let's start with a focused look at `ip_vs_proto_sctp.c` – that's the crucial SCTP protocol support file – and then broaden the inspection to any other relevant modules. Gotta verify that we have complete coverage and understand any potential nuances. I want to ensure this implementation adheres to performance expectations, and that no edge cases will rear their heads.
45/2	2026/07/09 07:02	tool	grepper	0m Args: { "Expression": "ip_vs_proto_sctp", "PathPrefix": "net/netfilter/ipvs/Makefile" } Results: { "Output": "net/netfilter/ipvs/Makefile=10=ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_AH_ESP) += ip_vs_proto_ah_esp.o\nnet/netfilter/ipvs/Makefile:11:ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_SCTP) += ip_vs_proto_sctp.o\nnet/netfilter/ipvs/Makefile-12-\n" }
46/2	2026/07/09 07:02	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 33473 output: 34 thoughts: 389 Thoughts: My Analysis of Kernel Configuration and Focus Symbols Okay, I've got this. Looks like `IP_VS_PROTO_SCTP`, `IP_VS_PROTO_TCP`, and `IP_VS_PROTO_UDP` are sufficient for the core protocol handling. This confirms my initial assessment. So the relevant configuration options are: * IP_VS * IP_VS_PROTO_TCP * IP_VS_PROTO_UDP * IP_VS_PROTO_SCTP * NF_FLOW_TABLE * BRIDGE_NF_EBTABLES * IP_SET * IP_SET_HASH_IP * NETFILTER_NETLINK_LOG * NETFILTER_NETLINK_QUEUE * NF_TABLES * NETFILTER_XT_MATCH_U32 * NF_DEFRAG_IPV6 My focus now shifts to the functions themselves. The list of symbols I'm keying on include the following: * `ip_vs_in_icmp` * `sctp_state_transition` * `tcp_state_transition` * `udp_state_transition` * `flow_offload_fill_route` * `nf_flow_tunnel_v4_push` * `nf_flow_tunnel_v6_push` * `nf_flow_offload_add` * `ebt_check_match` * `update_counters` * `compat_copy_ebt_replace_from_user` * `nf_ct_frag6_reasm` * `find_prev_fhdr` * `hash_ip4_gc` * `hash_ip4_resize` * `hash_ip4_add` * `hash_ip4_del` * `hash_ip6_gc` * `hash_ip6_resize` * `hash_ip6_add` * `hash_ip6_del` * `nfulnl_log_packet` * `nfqnl_build_packet_message` * `nft_lookup_eval` * `u32_match_it` * `u32_mt` Wait a minute, I should double-check that `update_counters` and `compat_copy_ebt_replace_from_user` are static in `ebtables.c`. I don't want to make any assumptions there, and it's always good practice to verify these things.
47/2	2026/07/09 07:03	tool	grepper	0m Args: { "Expression": "update_counters", "PathPrefix": "net/bridge/netfilter/ebtables.c" } Results: { "Output": "net/bridge/netfilter/ebtables.c=1362=void ebt_unregister_table(struct net net, const char name)\n--\nnet/bridge/netfilter/ebtables.c-1383-/* userspace just supplied us with counters /\nnet/bridge/netfilter/ebtables.c:1384:static int do_update_counters(struct net net, const char name,\nnet/bridge/netfilter/ebtables.c-1385-\t\t\t struct ebt_counter __user counters,\n--\nnet/bridge/netfilter/ebtables.c-1429-\nnet/bridge/netfilter/ebtables.c:1430:static int update_counters(struct net net, sockptr_t arg, unsigned int len)\nnet/bridge/netfilter/ebtables.c-1431-{\n--\nnet/bridge/netfilter/ebtables.c-1443-\nnet/bridge/netfilter/ebtables.c:1444:\treturn do_update_counters(net, hlp.name, hlp.counters,\nnet/bridge/netfilter/ebtables.c-1445-\t\t\t\t hlp.num_counters, len);\n--\nnet/bridge/netfilter/ebtables.c=2292=static int compat_do_replace(struct net net, sockptr_t arg, unsigned int len)\n--\nnet/bridge/netfilter/ebtables.c-2393-\nnet/bridge/netfilter/ebtables.c:2394:static int compat_update_counters(struct net net, sockptr_t arg,\nnet/bridge/netfilter/ebtables.c-2395-\t\t\t\t unsigned int len)\n--\nnet/bridge/netfilter/ebtables.c-2407-\tif (len != sizeof(hlp) + hlp.num_counters sizeof(struct ebt_counter))\nnet/bridge/netfilter/ebtables.c:2408:\t\treturn update_counters(net, arg, len);\nnet/bridge/netfilter/ebtables.c-2409-\nnet/bridge/netfilter/ebtables.c:2410:\treturn do_update_counters(net, hlp.name, compat_ptr(hlp.counters),\nnet/bridge/netfilter/ebtables.c-2411-\t\t\t\t hlp.num_counters, len);\n--\nnet/bridge/netfilter/ebtables.c=2555=static int do_ebt_set_ctl(struct sock *sk, int cmd, sockptr_t arg,\n--\nnet/bridge/netfilter/ebtables.c-2577-\t\tif (in_compat_syscall())\nnet/bridge/netfilter/ebtables.c:2578:\t\t\tret = compat_update_counters(net, arg, len);\nnet/bridge/netfilter/ebtables.c-2579-\t\telse\nnet/bridge/netfilter/ebtables.c-2580-#endif\nnet/bridge/netfilter/ebtables.c:2581:\t\t\tret = update_counters(net, arg, len);\nnet/bridge/netfilter/ebtables.c-2582-\t\tbreak;\n" }
48/2	2026/07/09 07:03	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 35281 output: 43 thoughts: 26 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Static Function Verification Okay, so the initial assessment is correct; those are indeed static functions. The next step is to drill down into the specifics. I need to verify the `compat_copy_ebt_replace_from_user` function. That's where the critical functionality lies, and I need to understand its behavior thoroughly before proceeding. We can't afford any assumptions here. The potential for vulnerabilities in user-space copy functions necessitates meticulous examination, particularly when dealing with the ebtables context. Time to pull up the code and get to it.
49/2	2026/07/09 07:03	tool	grepper	0m Args: { "Expression": "compat_copy_ebt_replace_from_user", "PathPrefix": "net/bridge/netfilter/ebtables.c" } Results: { "Output": "net/bridge/netfilter/ebtables.c=2236=static int compat_copy_entries(unsigned char data, unsigned int size_user,\n--\nnet/bridge/netfilter/ebtables.c-2253-\nnet/bridge/netfilter/ebtables.c:2254:static int compat_copy_ebt_replace_from_user(struct ebt_replace repl,\nnet/bridge/netfilter/ebtables.c-2255-\t\t\t\t\t sockptr_t arg, unsigned int len)\n--\nnet/bridge/netfilter/ebtables.c=2292=static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)\n--\nnet/bridge/netfilter/ebtables.c-2299-\nnet/bridge/netfilter/ebtables.c:2300:\tret = compat_copy_ebt_replace_from_user(\u0026tmp, arg, len);\nnet/bridge/netfilter/ebtables.c-2301-\tif (ret) {\n" }
50/2	2026/07/09 07:03	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 35753 output: 44 thoughts: 19 Thoughts: Okay, here's my summarized thought process, presented as if I were having these thoughts: Analyzing the Situation Alright, the core concept here appears to be static. Yes, that's what I'm concluding. Now, let's confirm the behavior of this crucial `find_prev_fhdr` function. Its behavior needs to be correct, and that needs to be the next step.
51/2	2026/07/09 07:03	tool	grepper	0m Args: { "Expression": "find_prev_fhdr", "PathPrefix": "net/ipv6/netfilter/nf_conntrack_reasm.c" } Results: { "Output": "net/ipv6/netfilter/nf_conntrack_reasm.c=396=static int\nnet/ipv6/netfilter/nf_conntrack_reasm.c:397:find_prev_fhdr(struct sk_buff skb, u8 prevhdrp, int prevhoff, int fhoff)\nnet/ipv6/netfilter/nf_conntrack_reasm.c-398-{\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c=446=int nf_ct_frag6_gather(struct net net, struct sk_buff skb, u32 user)\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-462-\nnet/ipv6/netfilter/nf_conntrack_reasm.c:463:\tif (find_prev_fhdr(skb, \u0026prevhdr, \u0026nhoff, \u0026fhoff) \u003c 0)\nnet/ipv6/netfilter/nf_conntrack_reasm.c-464-\t\treturn 0;\n" }
52/2	2026/07/09 07:03	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 36183 output: 44 thoughts: 36 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: Assessment of Tunnel Push Functions Right, the observation is that the state is static, which is the crux of the matter. My immediate instinct is to delve into the core of the packet-pushing mechanisms, specifically within the Netfilter framework. I need to understand why this static state is being observed. The two functions I'm focusing on, then, are `nf_flow_tunnel_v4_push` and `nf_flow_tunnel_v6_push`. These are the obvious entry points to investigate the data flow for IPv4 and IPv6 tunnels. My primary concern at this point revolves around how the tunnel encapsulation/decapsulation is managed in the context of Netfilter's flow tracking, and whether there are any potential locking or state management issues within those functions. The next logical step would be to trace the execution path from the point the packets hit these functions and see how the tunnel-specific data is processed, and whether anything sticks around that shouldn't.
53/2	2026/07/09 07:03	tool	grepper	0m Args: { "Expression": "nf_flow_tunnel_v4_push", "PathPrefix": "net/netfilter/nf_flow_table_ip.c" } Results: { "Output": "net/netfilter/nf_flow_table_ip.c=590=static int nf_flow_tunnel_ipip_push(struct net net, struct sk_buff skb,\n--\nnet/netfilter/nf_flow_table_ip.c-635-\nnet/netfilter/nf_flow_table_ip.c:636:static int nf_flow_tunnel_v4_push(struct net net, struct sk_buff skb,\nnet/netfilter/nf_flow_table_ip.c-637-\t\t\t\t struct flow_offload_tuple tuple,\n--\nnet/netfilter/nf_flow_table_ip.c=806=nf_flow_offload_ip_hook(void priv, struct sk_buff *skb,\n--\nnet/netfilter/nf_flow_table_ip.c-845-\nnet/netfilter/nf_flow_table_ip.c:846:\tif (nf_flow_tunnel_v4_push(state-\u003enet, skb, other_tuple,\nnet/netfilter/nf_flow_table_ip.c-847-\t\t\t\t tuplehash-\u003etuple.dst_cache, \u0026ip_daddr) \u003c 0)\n" }
54/2	2026/07/09 07:03	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 36804 output: 42 thoughts: 21 Thoughts: Here's my take on those thoughts, tailored for an expert audience: Examining Static Configurations and Flow Offload Route Filling Okay, so the initial assessment is that the configurations are, indeed, static. No surprises there. My primary concern at this point is verifying the correct population of the route table in relation to the flow offload mechanism. I need to make sure that the system is behaving as expected with regard to how routes are being filled, especially in the context of offloading. The next logical step is to dive into `flow_offload_fill_route` to confirm the route population strategy. I need to understand if the routes are being added with the proper attributes and next hops. Does it handle different offload scenarios, different types of routes (static vs. dynamic), and any potential corner cases efficiently? I'm hoping to quickly identify any potential gaps or inefficiencies in route propagation related to the flow offload functionality.
55/2	2026/07/09 07:03	tool	grepper	0m Args: { "Expression": "flow_offload_fill_route", "PathPrefix": "net/netfilter/nf_flow_table_core.c" } Results: { "Output": "net/netfilter/nf_flow_table_core.c=87=static struct dst_entry nft_route_dst_fetch(struct nf_flow_route route,\n--\nnet/netfilter/nf_flow_table_core.c-96-\nnet/netfilter/nf_flow_table_core.c:97:static int flow_offload_fill_route(struct flow_offload flow,\nnet/netfilter/nf_flow_table_core.c-98-\t\t\t\t struct nf_flow_route route,\n--\nnet/netfilter/nf_flow_table_core.c=164=void flow_offload_route_init(struct flow_offload *flow,\n--\nnet/netfilter/nf_flow_table_core.c-166-{\nnet/netfilter/nf_flow_table_core.c:167:\tflow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_ORIGINAL);\nnet/netfilter/nf_flow_table_core.c:168:\tflow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_REPLY);\nnet/netfilter/nf_flow_table_core.c-169-\tflow-\u003etype = NF_FLOW_OFFLOAD_ROUTE;\n" }
56/2	2026/07/09 07:03	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 37388 output: 37 thoughts: 19 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, and delivered as a first-person summary: Static Analysis Checkpoint Right, so I'm assessing this situation and the initial read indicates that the state is indeed static. No real surprises there, but that’s the starting point. My next move is to drill down and verify this assumption rigorously. I need to confirm this with hard data, so I'm immediately shifting focus to `ebt_check_match`. That’s where the meat of this analysis lies – that's the function I want to inspect to validate this "static" assessment. I need to see why we're seeing this, what the specific conditions are, and confirm that there's no dynamic state hidden beneath the surface. I need to ensure this isn't a false positive or an assumption that might be leading me down a wrong path. `ebt_check_match` is the key to either confirming or invalidating my initial impression of the system's state.
57/2	2026/07/09 07:03	tool	grepper	0m Args: { "Expression": "ebt_check_match", "PathPrefix": "net/bridge/netfilter/ebtables.c" } Results: { "Output": "net/bridge/netfilter/ebtables.c=393=static inline int\nnet/bridge/netfilter/ebtables.c:394:ebt_check_match(struct ebt_entry_match m, struct xt_mtchk_param par,\nnet/bridge/netfilter/ebtables.c-395-\t\tunsigned int cnt)\n--\nnet/bridge/netfilter/ebtables.c=685=ebt_check_entry(struct ebt_entry e, struct net *net,\n--\nnet/bridge/netfilter/ebtables.c-742-\tmtpar.family = tgpar.family = NFPROTO_BRIDGE;\nnet/bridge/netfilter/ebtables.c:743:\tret = EBT_MATCH_ITERATE(e, ebt_check_match, \u0026mtpar, \u0026i);\nnet/bridge/netfilter/ebtables.c-744-\tif (ret != 0)\n" }
58/2	2026/07/09 07:03	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 37907 output: 35 thoughts: 67 Thoughts: Analyzing the `ebt_check_entry` Function Okay, so the code utilizes `static inline`, which confirms my initial assessment. It looks like `ebt_check_entry` is called through `EBT_MATCH_ITERATE`. Given the potential complexities and dependencies, I'm going to lean towards using `ebt_check_entry` directly instead of `ebt_check_match` – better to be safe than sorry, and this approach feels more robust. Now, just to be thorough and to understand the broader implications, I need to check out what's happening within `nft_lookup_eval` as well. Let's see how that ties in.
59/2	2026/07/09 07:04	tool	grepper	0m Args: { "Expression": "nft_lookup_eval", "PathPrefix": "net/netfilter/nft_lookup.c" } Results: { "Output": "net/netfilter/nft_lookup.c=93=EXPORT_SYMBOL_GPL(nft_set_do_lookup);\nnet/netfilter/nft_lookup.c-94-\nnet/netfilter/nft_lookup.c:95:void nft_lookup_eval(const struct nft_expr expr,\nnet/netfilter/nft_lookup.c-96-\t\t struct nft_regs regs,\n--\nnet/netfilter/nft_lookup.c=269=static const struct nft_expr_ops nft_lookup_ops = {\n--\nnet/netfilter/nft_lookup.c-271-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_lookup)),\nnet/netfilter/nft_lookup.c:272:\t.eval\t\t= nft_lookup_eval,\nnet/netfilter/nft_lookup.c-273-\t.init\t\t= nft_lookup_init,\n" }
60/2	2026/07/09 07:04	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 38389 output: 39 thoughts: 34 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: Quick Scan: Export Status and Target Functions Right, so the first thing I'm gathering here is that we're dealing with something that's not statically defined within a module. The reference to "exported" or "non-static" strongly suggests that it is externally visible and likely intended for interaction with other modules or even outside the current compilation unit. Now, the natural next step is to nail down exactly what we are looking at. I need to understand its functionality and integration. I'm thinking, let's take a look at `u32_match_it` and `u32_mt`. Those two function names suggest something dealing with 32-bit unsigned integers, perhaps matching or manipulation respectively. Given the context, these seem to be the prime candidates to investigate further. I'll need to dig into their definitions to understand the full implications of the external scope implied earlier.
61/2	2026/07/09 07:04	tool	grepper	0m Args: { "Expression": "u32_match_it", "PathPrefix": "net/netfilter/xt_u32.c" } Results: { "Output": "net/netfilter/xt_u32.c-16-\nnet/netfilter/xt_u32.c:17:static int u32_match_it(const struct xt_u32 data,\nnet/netfilter/xt_u32.c-18-\t\t\tconst struct sk_buff skb)\n--\nnet/netfilter/xt_u32.c=91=static bool u32_mt(const struct sk_buff skb, struct xt_action_param par)\n--\nnet/netfilter/xt_u32.c-95-\nnet/netfilter/xt_u32.c:96:\tret = u32_match_it(data, skb);\nnet/netfilter/xt_u32.c-97-\tif (ret \u003c 0) {\n" }
62/2	2026/07/09 07:04	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 38897 output: 47 thoughts: 51 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: Reaching for the Right Tool for the Job Alright, so the code structure is pretty straightforward here. I've noted that `u32_match_it` is declared as static, as is `u32_mt`. No real surprises there. Given the context, I'm leaning toward employing `u32_mt`. It seems the more appropriate choice, given its static nature in this scenario. Now, let's pivot to examine `nf_ct_frag6_reasm`. I need to understand its relationship to these other components to ensure seamless integration and avoid any potential conflicts within this module. I'm thinking I need to understand how those interfaces interact. Time to dive into the details.
63/2	2026/07/09 07:04	tool	grepper	0m Args: { "Expression": "nf_ct_frag6_reasm", "PathPrefix": "net/ipv6/netfilter/nf_conntrack_reasm.c" } Results: { "Output": "net/ipv6/netfilter/nf_conntrack_reasm.c=120=static void __net_exit nf_ct_frags6_sysctl_unregister(struct net net)\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-124-\nnet/ipv6/netfilter/nf_conntrack_reasm.c:125:static int nf_ct_frag6_reasm(struct frag_queue fq, struct sk_buff skb,\nnet/ipv6/netfilter/nf_conntrack_reasm.c-126-\t\t\t struct sk_buff prev_tail, struct net_device dev,\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c=170=static int nf_ct_frag6_queue(struct frag_queue fq, struct sk_buff skb,\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-291-\t\tskb-\u003e_skb_refdst = 0UL;\nnet/ipv6/netfilter/nf_conntrack_reasm.c:292:\t\terr = nf_ct_frag6_reasm(fq, skb, prev, dev, refs);\nnet/ipv6/netfilter/nf_conntrack_reasm.c-293-\t\tskb-\u003e_skb_refdst = orefdst;\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-318- /\nnet/ipv6/netfilter/nf_conntrack_reasm.c:319:static int nf_ct_frag6_reasm(struct frag_queue fq, struct sk_buff skb,\nnet/ipv6/netfilter/nf_conntrack_reasm.c-320-\t\t\t struct sk_buff prev_tail, struct net_device dev,\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-340-\tif (payload_len \u003e IPV6_MAXPLEN) {\nnet/ipv6/netfilter/nf_conntrack_reasm.c:341:\t\tnet_dbg_ratelimited(\"nf_ct_frag6_reasm: payload len = %d\\n\",\nnet/ipv6/netfilter/nf_conntrack_reasm.c-342-\t\t\t\t payload_len);\n" }
64/2	2026/07/09 07:04	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 39771 output: 43 thoughts: 60 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, as if they were my own: Static Flow Table Considerations Right, it's clear the system is static. Given that constraint, I'm leaning toward either `nf_ct_frag6_queue` or `nf_ct_frag6_gather`. I think `nf_ct_frag6_gather` is the better choice for this particular scenario; it seems more efficient in the long run. Now, let me just quickly check the `nf_flow_offload_add` function to ensure that it's compatible with that approach. I need to make sure the flow offload addition logic will integrate seamlessly with the fragmentation handling I'm implementing. Gotta consider the bigger picture here.
65/2	2026/07/09 07:04	tool	grepper	0m Args: { "Expression": "nf_flow_offload_add", "PathPrefix": "net/netfilter/nf_flow_table_offload.c" } Results: { "Output": "net/netfilter/nf_flow_table_offload.c-19-\nnet/netfilter/nf_flow_table_offload.c:20:static struct workqueue_struct nf_flow_offload_add_wq;\nnet/netfilter/nf_flow_table_offload.c-21-static struct workqueue_struct nf_flow_offload_del_wq;\n--\nnet/netfilter/nf_flow_table_offload.c=1065=static void flow_offload_queue_work(struct flow_offload_work offload)\n--\nnet/netfilter/nf_flow_table_offload.c-1070-\t\tNF_FLOW_TABLE_STAT_INC_ATOMIC(net, count_wq_add);\nnet/netfilter/nf_flow_table_offload.c:1071:\t\tqueue_work(nf_flow_offload_add_wq, \u0026offload-\u003ework);\nnet/netfilter/nf_flow_table_offload.c-1072-\t} else if (offload-\u003ecmd == FLOW_CLS_DESTROY) {\n--\nnet/netfilter/nf_flow_table_offload.c=1113=void nf_flow_offload_refresh(struct nf_flowtable flowtable,\n--\nnet/netfilter/nf_flow_table_offload.c-1124-\nnet/netfilter/nf_flow_table_offload.c:1125:void nf_flow_offload_add(struct nf_flowtable flowtable,\nnet/netfilter/nf_flow_table_offload.c-1126-\t\t\t struct flow_offload flow)\n--\nnet/netfilter/nf_flow_table_offload.c=1173=void nf_flow_table_offload_flush(struct nf_flowtable *flowtable)\n--\nnet/netfilter/nf_flow_table_offload.c-1175-\tif (nf_flowtable_hw_offload(flowtable)) {\nnet/netfilter/nf_flow_table_offload.c:1176:\t\tflush_workqueue(nf_flow_offload_add_wq);\nnet/netfilter/nf_flow_table_offload.c-1177-\t\tflush_workqueue(nf_flow_offload_del_wq);\n--\nnet/netfilter/nf_flow_table_offload.c=1294=int nf_flow_table_offload_init(void)\nnet/netfilter/nf_flow_table_offload.c-1295-{\nnet/netfilter/nf_flow_table_offload.c:1296:\tnf_flow_offload_add_wq = alloc_workqueue(\"nf_ft_offload_add\",\nnet/netfilter/nf_flow_table_offload.c-1297-\t\t\t\t\t\t WQ_UNBOUND \| WQ_SYSFS, 0);\nnet/netfilter/nf_flow_table_offload.c:1298:\tif (!nf_flow_offload_add_wq)\nnet/netfilter/nf_flow_table_offload.c-1299-\t\treturn -ENOMEM;\n--\nnet/netfilter/nf_flow_table_offload.c-1315-err_del_wq:\nnet/netfilter/nf_flow_table_offload.c:1316:\tdestroy_workqueue(nf_flow_offload_add_wq);\nnet/netfilter/nf_flow_table_offload.c-1317-\treturn -ENOMEM;\n--\nnet/netfilter/nf_flow_table_offload.c=1320=void nf_flow_table_offload_exit(void)\nnet/netfilter/nf_flow_table_offload.c-1321-{\nnet/netfilter/nf_flow_table_offload.c:1322:\tdestroy_workqueue(nf_flow_offload_add_wq);\nnet/netfilter/nf_flow_table_offload.c-1323-\tdestroy_workqueue(nf_flow_offload_del_wq);\n" }
66/2	2026/07/09 07:04	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 41074 output: 46 thoughts: 566 Thoughts: My Refinement of the Symbol List Okay, let's refine this symbol list for our analysis. I've been carefully reviewing each function and its potential replacement, ensuring we maintain semantic equivalence. First, `nf_flow_offload_add` remains our target as it's non-static. Now, I'm confirming my earlier assumptions regarding static functions and their replacements. I'll use `nf_flow_offload_ip_hook` instead of the static `nf_flow_tunnel_v4_push`, and `nf_flow_offload_ipv6_hook` instead of `nf_flow_tunnel_v6_push`. For `flow_offload_fill_route`, I'll use `flow_offload_route_init`. Next, for `ebt_check_match`, I will use `ebt_check_entry`. For `update_counters`, I will use either `do_update_counters` or `do_ebt_set_ctl`, depending on the specific use case that I identify. For `compat_copy_ebt_replace_from_user`, I'm going with `compat_do_replace`. `hash_ip4_gc` is good as it is. I will be using `nfulnl_log_packet` as the replacement for `__build_packet_message`, after which I will consider replacing the static `nfqnl_build_packet_message`. We'll use `u32_mt` to replace `u32_match_it`, and `nf_ct_frag6_gather` for both `nf_ct_frag6_reasm` and `find_prev_fhdr`. So, here's my updated, final list of focus symbols: * `ip_vs_in_icmp` * `sctp_state_transition` * `tcp_state_transition` * `udp_state_transition` * `flow_offload_route_init` * `nf_flow_offload_ip_hook` * `nf_flow_offload_ipv6_hook` * `nf_flow_offload_add` * `ebt_check_entry` * `do_ebt_set_ctl` * `compat_do_replace` * `nf_ct_frag6_gather` * `hash_ip4_gc` * `hash_ip4_resize` * `hash_ip4_add` * `hash_ip4_del` * `hash_ip6_gc` * `hash_ip6_resize` * `hash_ip6_add` * `hash_ip6_del` * `nfulnl_log_packet` * `nfqnl_build_packet_message` * `nft_lookup_eval` * `u32_mt` Ah, hold on... `sctp_state_transition` is static! I'll quickly check the source file `ip_vs_proto_sctp.c` to see if there's a more appropriate non-static counterpart. Now I can move on with confidence and build my analysis.
67/2	2026/07/09 07:05	tool	grepper	0m Args: { "Expression": "sctp_state_transition", "PathPrefix": "net/netfilter/ipvs/ip_vs_proto_sctp.c" } Results: { "Output": "net/netfilter/ipvs/ip_vs_proto_sctp.c=464=static void\nnet/netfilter/ipvs/ip_vs_proto_sctp.c:465:sctp_state_transition(struct ip_vs_conn cp, int direction,\nnet/netfilter/ipvs/ip_vs_proto_sctp.c-466-\t\tconst struct sk_buff skb, struct ip_vs_proto_data *pd,\n--\nnet/netfilter/ipvs/ip_vs_proto_sctp.c=566=struct ip_vs_protocol ip_vs_protocol_sctp = {\n--\nnet/netfilter/ipvs/ip_vs_proto_sctp.c-582-\t.state_name\t= sctp_state_name,\nnet/netfilter/ipvs/ip_vs_proto_sctp.c:583:\t.state_transition = sctp_state_transition,\nnet/netfilter/ipvs/ip_vs_proto_sctp.c-584-\t.app_conn_bind\t= sctp_app_conn_bind,\n" }
68/2	2026/07/09 07:05	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 42715 output: 38 thoughts: 204 Thoughts: Analyzing Potential Fuzzing Targets Okay, so I'm looking at this static piece of code, but the key is that it's assigned to a function pointer. That's interesting, because even though it's technically static, if it's referenced through that pointer, and especially if it ends up in the symbol table, then syzkaller should still be able to fuzz it. So that makes it a possibility. The same line of reasoning goes for `tcp_state_transition` and `udp_state_transition`. They're worth a look, too. They probably are also assigned to a function pointer somewhere. Now, let's turn our attention to `hash_ip4_gc`. That's a static function generated by a macro, which makes things a bit more interesting to figure out if it is in the symbol table, too. That could be a juicy target, depending on what the macro does. Alright, time to go back and double-check the configuration options. Let's see... I've got `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, `IP_SET_HASH_IP`, `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32` and `NF_DEFRAG_IPV6`. I'm wondering though, is `IP_VS_PROTO_TCP` even a config? It's related to the other configs. I should really verify that.
69/2	2026/07/09 07:05	tool	grepper	0m Error: no matches Args: { "Expression": "config IP_VS_PROTO_TCP", "PathPrefix": "net/netfilter/ipvs/Kconfig" } Results: { "error": "no matches" }
70/2	2026/07/09 07:05	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 43339 output: 37 thoughts: 24 Thoughts: Okay, here's my interpretation of that thought process, assuming I'm deep in the weeds of IP Virtual Server (IPVS) configuration: Initial IPVS Configuration Inquiry Hmm, so `IP_VS_PROTO_TCP`... I need to clarify something quickly. Is that module, `IP_VS_PROTO_TCP`, automatically loaded and active as part of the core `IP_VS` module suite? Or is it something that needs to be explicitly enabled, a separate module that's often included but not guaranteed? I need to know this foundational aspect of its default behavior. Understanding this base level of interaction is important before I move forward.
71/2	2026/07/09 07:05	tool	grepper	0m Args: { "Expression": "IP_VS_PROTO_TCP", "PathPrefix": "net/netfilter/ipvs/Kconfig" } Results: { "Output": "net/netfilter/ipvs/Kconfig=77=comment \"IPVS transport protocol load balancing support\"\nnet/netfilter/ipvs/Kconfig-78-\nnet/netfilter/ipvs/Kconfig:79:config\tIP_VS_PROTO_TCP\nnet/netfilter/ipvs/Kconfig-80-\tbool \"TCP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig=321=config\tIP_VS_FTP\nnet/netfilter/ipvs/Kconfig-322-\ttristate \"FTP protocol helper\"\nnet/netfilter/ipvs/Kconfig:323:\tdepends on IP_VS_PROTO_TCP \u0026\u0026 NF_CONNTRACK \u0026\u0026 NF_NAT \u0026\u0026 \\\nnet/netfilter/ipvs/Kconfig-324-\t\tNF_CONNTRACK_FTP\n" }
72/2	2026/07/09 07:05	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 43747 output: 37 thoughts: 67 Thoughts: Debugging a Configuration Check Okay, here we go, looking at this configuration. Ah, yes, it's `config IP_VS_PROTO_TCP`. Wait a second… that grep failed, didn't it? Right, I bet I know what happened. There's probably a tab character in that line. Yup, here it is: `config\tIP_VS_PROTO_TCP`. Annoying, but easily spotted. So `IP_VS_PROTO_TCP` is definitely a valid configuration item. Now, let me see, what about `IP_VS_PROTO_UDP`? I need to check that one next.
73/2	2026/07/09 07:05	tool	grepper	0m Args: { "Expression": "IP_VS_PROTO_UDP", "PathPrefix": "net/netfilter/ipvs/Kconfig" } Results: { "Output": "net/netfilter/ipvs/Kconfig=79=config\tIP_VS_PROTO_TCP\n--\nnet/netfilter/ipvs/Kconfig-84-\nnet/netfilter/ipvs/Kconfig:85:config\tIP_VS_PROTO_UDP\nnet/netfilter/ipvs/Kconfig-86-\tbool \"UDP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig=345=config\tIP_VS_PE_SIP\nnet/netfilter/ipvs/Kconfig-346-\ttristate \"SIP persistence engine\"\nnet/netfilter/ipvs/Kconfig:347:\tdepends on IP_VS_PROTO_UDP\nnet/netfilter/ipvs/Kconfig-348-\tdepends on NF_CONNTRACK_SIP\n" }
74/2	2026/07/09 07:05	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 44191 output: 39 thoughts: 21 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: Validating Protocol Inclusion Alright, that initial assessment – yes, it's valid. We can move forward with that assumption. Now, I need to consider a specific point: what about the inclusion of the `IP_VS_PROTO_SCTP` flag? I need to quickly recall the implications of its usage, and its relationship to our overall system architecture. It's crucial we don't overlook its impact on traffic flows or potential interactions with other protocol handlers. Need to assess that quickly.
75/2	2026/07/09 07:05	tool	grepper	0m Args: { "Expression": "IP_VS_PROTO_SCTP", "PathPrefix": "net/netfilter/ipvs/Kconfig" } Results: { "Output": "net/netfilter/ipvs/Kconfig=100=config\tIP_VS_PROTO_AH\n--\nnet/netfilter/ipvs/Kconfig-105-\nnet/netfilter/ipvs/Kconfig:106:config IP_VS_PROTO_SCTP\nnet/netfilter/ipvs/Kconfig-107-\tbool \"SCTP load balancing support\"\n" }
76/2	2026/07/09 07:05	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 44489 output: 442 thoughts: 1570 Thoughts: Fuzzing Target Refinement Okay, so I've gone through this patch and confirmed its validity as a target for fuzzing. The configurations enabling the relevant features are `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, `IP_SET_HASH_IP`, `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32`, and `NF_DEFRAG_IPV6`. I've made a quick mental note of those. Now, I've got a list of symbols to focus the fuzzing efforts. It started with some known ones: `ip_vs_in_icmp`, `sctp_state_transition`, `tcp_state_transition`, `udp_state_transition`, `flow_offload_route_init`, `nf_flow_offload_ip_hook`, `nf_flow_offload_ipv6_hook`, `nf_flow_offload_add`, `ebt_check_entry`, `do_ebt_set_ctl`, `compat_do_replace`, `nf_ct_frag6_gather`, and `nft_lookup_eval`. I’ve double checked the ipset symbols like `hash_ip4_gc`, `hash_ip4_resize`, `hash_ip4_add`, `hash_ip4_del`, `hash_ip6_gc`, `hash_ip6_resize`, `hash_ip6_add`, and `hash_ip6_del`, all of which I confirmed are correctly generated. I dug a bit deeper. I needed to be sure about functions called by other functions, and since I need the entrypoint to the function, I checked to see what was most appropriate. After confirming `nf_flow_offload_add` sets `NF_FLOW_HW` and calls `nf_flow_offload_refresh` I added the refresh to the list. I decided to use `nf_flow_offload_ip_hook` instead of the static `nf_flow_tunnel_ipip_push`. I'll use `u32_mt` instead of the static `u32_match_it`, and `nfulnl_log_packet` instead of the static inline `__build_packet_message`, `nfqnl_build_packet_message` over its static alternative. The static function `nf_ct_frag6_reasm` is covered by `nf_ct_frag6_gather`, and the static function `find_prev_fhdr` also can be covered by it. Similarly, the static inline `ebt_check_match` has been replaced with `ebt_check_entry`, `update_counters` can be represented by `do_ebt_set_ctl`, and `compat_copy_ebt_replace_from_user` has `compat_do_replace`. So, the definitive list, after this thorough review, is the following: * `ip_vs_in_icmp` * `sctp_state_transition` * `tcp_state_transition` * `udp_state_transition` * `flow_offload_route_init` * `nf_flow_offload_ip_hook` * `nf_flow_offload_ipv6_hook` * `nf_flow_offload_add` * `nf_flow_offload_refresh` * `ebt_check_entry` * `do_ebt_set_ctl` * `compat_do_replace` * `nf_ct_frag6_gather` * `hash_ip4_gc` * `hash_ip4_resize` * `hash_ip4_add` * `hash_ip4_del` * `hash_ip6_gc` * `hash_ip6_resize` * `hash_ip6_add` * `hash_ip6_del` * `nfulnl_log_packet` * `nfqnl_build_packet_message` * `nft_lookup_eval` * `u32_mt` Given these symbols, and the identified configurations, this patch seems like a solid target for fuzzing. It's got netfilter and ipvs components, and those are definitely worth
77/2	2026/07/09 07:06	tool	set-results	0m Args: { "EnableConfigs": [ "IP_VS", "IP_VS_PROTO_TCP", "IP_VS_PROTO_UDP", "IP_VS_PROTO_SCTP", "NF_FLOW_TABLE", "BRIDGE_NF_EBTABLES", "IP_SET", "IP_SET_HASH_IP", "NETFILTER_NETLINK_LOG", "NETFILTER_NETLINK_QUEUE", "NF_TABLES", "NETFILTER_XT_MATCH_U32", "NF_DEFRAG_IPV6" ], "FocusSymbols": [ "ip_vs_in_icmp", "sctp_state_transition", "tcp_state_transition", "udp_state_transition", "flow_offload_route_init", "nf_flow_offload_ip_hook", "nf_flow_offload_ipv6_hook", "nf_flow_offload_add", "nf_flow_offload_refresh", "ebt_check_entry", "do_ebt_set_ctl", "compat_do_replace", "nf_ct_frag6_gather", "hash_ip4_gc", "hash_ip4_resize", "hash_ip4_add", "hash_ip4_del", "hash_ip6_gc", "hash_ip6_resize", "hash_ip6_add", "hash_ip6_del", "nfulnl_log_packet", "nfqnl_build_packet_message", "nft_lookup_eval", "u32_mt" ], "Reasoning": "The patch contains functional changes to various netfilter and ipvs components, fixing potential out-of-bounds reads, incorrect header length calculations, and synchronization issues. It modifies reachable core kernel logic and should be fuzzed.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "IP_VS", "IP_VS_PROTO_TCP", "IP_VS_PROTO_UDP", "IP_VS_PROTO_SCTP", "NF_FLOW_TABLE", "BRIDGE_NF_EBTABLES", "IP_SET", "IP_SET_HASH_IP", "NETFILTER_NETLINK_LOG", "NETFILTER_NETLINK_QUEUE", "NF_TABLES", "NETFILTER_XT_MATCH_U32", "NF_DEFRAG_IPV6" ], "FocusSymbols": [ "ip_vs_in_icmp", "sctp_state_transition", "tcp_state_transition", "udp_state_transition", "flow_offload_route_init", "nf_flow_offload_ip_hook", "nf_flow_offload_ipv6_hook", "nf_flow_offload_add", "nf_flow_offload_refresh", "ebt_check_entry", "do_ebt_set_ctl", "compat_do_replace", "nf_ct_frag6_gather", "hash_ip4_gc", "hash_ip4_resize", "hash_ip4_add", "hash_ip4_del", "hash_ip6_gc", "hash_ip6_resize", "hash_ip6_add", "hash_ip6_del", "nfulnl_log_packet", "nfqnl_build_packet_message", "nft_lookup_eval", "u32_mt" ], "Reasoning": "The patch contains functional changes to various netfilter and ipvs components, fixing potential out-of-bounds reads, incorrect header length calculations, and synchronization issues. It modifies reachable core kernel logic and should be fuzzed.", "WorthFuzzing": true }

{
  "EnableConfigs": [
    "IP_VS",
    "IP_VS_PROTO_TCP",
    "IP_VS_PROTO_UDP",
    "IP_VS_PROTO_SCTP",
    "NF_FLOW_TABLE",
    "BRIDGE_NF_EBTABLES",
    "IP_SET",
    "IP_SET_HASH_IP",
    "NETFILTER_NETLINK_LOG",
    "NETFILTER_NETLINK_QUEUE",
    "NF_TABLES",
    "NETFILTER_XT_MATCH_U32",
    "NF_DEFRAG_IPV6"
  ],
  "FocusSymbols": [
    "ip_vs_in_icmp",
    "sctp_state_transition",
    "tcp_state_transition",
    "udp_state_transition",
    "flow_offload_route_init",
    "nf_flow_offload_ip_hook",
    "nf_flow_offload_ipv6_hook",
    "nf_flow_offload_add",
    "nf_flow_offload_refresh",
    "ebt_check_entry",
    "do_ebt_set_ctl",
    "compat_do_replace",
    "nf_ct_frag6_gather",
    "hash_ip4_gc",
    "hash_ip4_resize",
    "hash_ip4_add",
    "hash_ip4_del",
    "hash_ip6_gc",
    "hash_ip6_resize",
    "hash_ip6_add",
    "hash_ip6_del",
    "nfulnl_log_packet",
    "nfqnl_build_packet_message",
    "nft_lookup_eval",
    "u32_mt"
  ],
  "Reasoning": "The patch contains functional changes to various netfilter and ipvs components, fixing potential out-of-bounds reads, incorrect header length calculations, and synchronization issues. It modifies reachable core kernel logic and should be fuzzed.",
  "WorthFuzzing": true
}

{
  "PatchDiff": "commit d172f8e019d60662a8e73adbe4a86161cec84419\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Jul 9 06:57:34 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/include/net/ip_vs.h b/include/net/ip_vs.h\nindex 49297fec448a82..417ff51f62fc8e 100644\n--- a/include/net/ip_vs.h\n+++ b/include/net/ip_vs.h\n@@ -752,7 +752,8 @@ struct ip_vs_protocol {\n \n \tvoid (*state_transition)(struct ip_vs_conn *cp, int direction,\n \t\t\t\t const struct sk_buff *skb,\n-\t\t\t\t struct ip_vs_proto_data *pd);\n+\t\t\t\t struct ip_vs_proto_data *pd,\n+\t\t\t\t unsigned int iph_len);\n \n \tint (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);\n \ndiff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h\nindex 7b23b245a5a86a..ce414118962f54 100644\n--- a/include/net/netfilter/nf_flow_table.h\n+++ b/include/net/netfilter/nf_flow_table.h\n@@ -155,11 +155,12 @@ struct flow_offload_tuple {\n \t\t\t\t\ttun_num:2,\n \t\t\t\t\tin_vlan_ingress:2;\n \tu16\t\t\t\tmtu;\n+\tu32\t\t\t\tdst_cookie;\n+\tstruct dst_entry\t\t*dst_cache;\n+\n \tunion {\n \t\tstruct {\n-\t\t\tstruct dst_entry *dst_cache;\n \t\t\tu32\t\tifidx;\n-\t\t\tu32\t\tdst_cookie;\n \t\t};\n \t\tstruct {\n \t\t\tu32\t\tifidx;\n@@ -357,6 +358,8 @@ static inline int nf_flow_register_bpf(void)\n \n void nf_flow_offload_add(struct nf_flowtable *flowtable,\n \t\t\t struct flow_offload *flow);\n+void nf_flow_offload_refresh(struct nf_flowtable *flowtable,\n+\t\t\t     struct flow_offload *flow);\n void nf_flow_offload_del(struct nf_flowtable *flowtable,\n \t\t\t struct flow_offload *flow);\n void nf_flow_offload_stats(struct nf_flowtable *flowtable,\ndiff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c\nindex f20c039e44c8d7..96c9a8f57c8702 100644\n--- a/net/bridge/netfilter/ebtables.c\n+++ b/net/bridge/netfilter/ebtables.c\n@@ -403,6 +403,9 @@ ebt_check_match(struct ebt_entry_match *m, struct xt_mtchk_param *par,\n \t    left - sizeof(struct ebt_entry_match) \u003c m-\u003ematch_size)\n \t\treturn -EINVAL;\n \n+\tif (strnlen(m-\u003eu.name, XT_EXTENSION_MAXNAMELEN) == XT_EXTENSION_MAXNAMELEN)\n+\t\treturn -EINVAL;\n+\n \tmatch = xt_find_match(NFPROTO_BRIDGE, m-\u003eu.name, m-\u003eu.revision);\n \tif (IS_ERR(match) || match-\u003efamily != NFPROTO_BRIDGE) {\n \t\tif (!IS_ERR(match))\n@@ -921,8 +924,7 @@ static int translate_table(struct net *net, const char *name,\n \t\t * if an error occurs\n \t\t */\n \t\tnewinfo-\u003echainstack =\n-\t\t\tvmalloc_array(nr_cpu_ids,\n-\t\t\t\t      sizeof(*(newinfo-\u003echainstack)));\n+\t\t\tvcalloc(nr_cpu_ids, sizeof(*(newinfo-\u003echainstack)));\n \t\tif (!newinfo-\u003echainstack)\n \t\t\treturn -ENOMEM;\n \t\tfor_each_possible_cpu(i) {\n@@ -1434,6 +1436,8 @@ static int update_counters(struct net *net, sockptr_t arg, unsigned int len)\n \tif (copy_from_sockptr(\u0026hlp, arg, sizeof(hlp)))\n \t\treturn -EFAULT;\n \n+\thlp.name[sizeof(hlp.name) - 1] = '\\0';\n+\n \tif (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))\n \t\treturn -EINVAL;\n \n@@ -2273,6 +2277,8 @@ static int compat_copy_ebt_replace_from_user(struct ebt_replace *repl,\n \n \tmemcpy(repl, \u0026tmp, offsetof(struct ebt_replace, hook_entry));\n \n+\trepl-\u003ename[sizeof(repl-\u003ename) - 1] = '\\0';\n+\n \t/* starting with hook_entry, 32 vs. 64 bit structures are different */\n \tfor (i = 0; i \u003c NF_BR_NUMHOOKS; i++)\n \t\trepl-\u003ehook_entry[i] = compat_ptr(tmp.hook_entry[i]);\n@@ -2395,6 +2401,8 @@ static int compat_update_counters(struct net *net, sockptr_t arg,\n \tif (copy_from_sockptr(\u0026hlp, arg, sizeof(hlp)))\n \t\treturn -EFAULT;\n \n+\thlp.name[sizeof(hlp.name) - 1] = '\\0';\n+\n \t/* try real handler in case userland supplied needed padding */\n \tif (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))\n \t\treturn update_counters(net, arg, len);\ndiff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c\nindex 64ab23ff559bb9..599c49bf0a0afd 100644\n--- a/net/ipv6/netfilter/nf_conntrack_reasm.c\n+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c\n@@ -348,7 +348,8 @@ static int nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *skb,\n \tskb_network_header(skb)[fq-\u003enhoffset] = skb_transport_header(skb)[0];\n \tmemmove(skb-\u003ehead + sizeof(struct frag_hdr), skb-\u003ehead,\n \t\t(skb-\u003edata - skb-\u003ehead) - sizeof(struct frag_hdr));\n-\tskb-\u003emac_header += sizeof(struct frag_hdr);\n+\tif (skb_mac_header_was_set(skb))\n+\t\tskb-\u003emac_header += sizeof(struct frag_hdr);\n \tskb-\u003enetwork_header += sizeof(struct frag_hdr);\n \n \tskb_reset_transport_header(skb);\n@@ -418,7 +419,7 @@ find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff)\n \t\t\treturn -1;\n \t\t}\n \t\tif (skb_copy_bits(skb, start, \u0026hdr, sizeof(hdr)))\n-\t\t\tBUG();\n+\t\t\treturn -1;\n \t\tif (nexthdr == NEXTHDR_AUTH)\n \t\t\thdrlen = ipv6_authlen(\u0026hdr);\n \t\telse\ndiff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h\nindex dedf59b661ddf3..8231317b0f1f4b 100644\n--- a/net/netfilter/ipset/ip_set_hash_gen.h\n+++ b/net/netfilter/ipset/ip_set_hash_gen.h\n@@ -75,15 +75,17 @@ struct hbucket {\n struct htable_gc {\n \tstruct delayed_work dwork;\n \tstruct ip_set *set;\t/* Set the gc belongs to */\n+\tspinlock_t lock;\t/* Lock to exclude gc and resize */\n \tu32 region;\t\t/* Last gc run position */\n };\n \n /* The hash table: the table size stored here in order to make resizing easy */\n struct htable {\n-\tatomic_t ref;\t\t/* References for resizing */\n+\tbool resizing;\t\t/* Mark ongoing resize */\n \tatomic_t uref;\t\t/* References for dumping and gc */\n \tu8 htable_bits;\t\t/* size of hash table == 2^htable_bits */\n \tu32 maxelem;\t\t/* Maxelem per region */\n+\tstruct list_head ad;\t/* Resize add|del backlist */\n \tstruct ip_set_region *hregion;\t/* Region locks and ext sizes */\n \tstruct hbucket __rcu *bucket[]; /* hashtable buckets */\n };\n@@ -301,11 +303,13 @@ struct htype {\n \tu8 netmask;\t\t/* netmask value for subnets to store */\n \tunion nf_inet_addr bitmask;\t/* stores bitmask */\n #endif\n-\tstruct list_head ad;\t/* Resize add|del backlist */\n-\tstruct mtype_elem next; /* temporary storage for uadd */\n #ifdef IP_SET_HASH_WITH_NETS\n \tstruct net_prefixes nets[NLEN]; /* book-keeping of prefixes */\n #endif\n+\t/* Because 'next' is IPv4/IPv6 dependent, no elements of this\n+\t * structure and referred in create() may come after 'next'.\n+\t */\n+\tstruct mtype_elem next; /* temporary storage for uadd */\n };\n \n /* ADD|DEL entries saved during resize */\n@@ -451,13 +455,14 @@ static void\n mtype_destroy(struct ip_set *set)\n {\n \tstruct htype *h = set-\u003edata;\n+\tstruct htable *t = (__force struct htable *)h-\u003etable;\n \tstruct list_head *l, *lt;\n \n-\tmtype_ahash_destroy(set, (__force struct htable *)h-\u003etable, true);\n-\tlist_for_each_safe(l, lt, \u0026h-\u003ead) {\n+\tlist_for_each_safe(l, lt, \u0026t-\u003ead) {\n \t\tlist_del(l);\n \t\tkfree(l);\n \t}\n+\tmtype_ahash_destroy(set, t, true);\n \tkfree(h);\n \n \tset-\u003edata = NULL;\n@@ -569,9 +574,10 @@ mtype_gc(struct work_struct *work)\n \tset = gc-\u003eset;\n \th = set-\u003edata;\n \n-\tspin_lock_bh(\u0026set-\u003elock);\n-\tt = ipset_dereference_set(h-\u003etable, set);\n+\trcu_read_lock_bh();\n+\tt = rcu_dereference_bh(h-\u003etable);\n \tatomic_inc(\u0026t-\u003euref);\n+\trcu_read_unlock_bh();\n \tnumof_locks = ahash_numof_locks(t-\u003ehtable_bits);\n \tr = gc-\u003eregion++;\n \tif (r \u003e= numof_locks) {\n@@ -580,11 +586,13 @@ mtype_gc(struct work_struct *work)\n \tnext_run = (IPSET_GC_PERIOD(set-\u003etimeout) * HZ) / numof_locks;\n \tif (next_run \u003c HZ/10)\n \t\tnext_run = HZ/10;\n-\tspin_unlock_bh(\u0026set-\u003elock);\n \n-\tmtype_gc_do(set, h, t, r);\n+\tspin_lock_bh(\u0026gc-\u003elock);\n+\tif (!t-\u003eresizing)\n+\t\tmtype_gc_do(set, h, t, r);\n+\tspin_unlock_bh(\u0026gc-\u003elock);\n \n-\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 atomic_read(\u0026t-\u003eref)) {\n+\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 t-\u003eresizing) {\n \t\tpr_debug(\"Table destroy after resize by expire: %p\\n\", t);\n \t\tmtype_ahash_destroy(set, t, false);\n \t}\n@@ -668,15 +676,18 @@ mtype_resize(struct ip_set *set, bool retried)\n \t}\n \tt-\u003ehtable_bits = htable_bits;\n \tt-\u003emaxelem = h-\u003emaxelem / ahash_numof_locks(htable_bits);\n+\tINIT_LIST_HEAD(\u0026t-\u003ead);\n \tfor (i = 0; i \u003c ahash_numof_locks(htable_bits); i++)\n \t\tspin_lock_init(\u0026t-\u003ehregion[i].lock);\n \n \t/* There can't be another parallel resizing,\n-\t * but dumping, gc, kernel side add/del are possible\n+\t * but dumping and kernel side add/del are possible\n \t */\n \torig = ipset_dereference_bh_nfnl(h-\u003etable);\n-\tatomic_set(\u0026orig-\u003eref, 1);\n \tatomic_inc(\u0026orig-\u003euref);\n+\tspin_lock_bh(\u0026h-\u003egc.lock);\n+\torig-\u003eresizing = true;\n+\tspin_unlock_bh(\u0026h-\u003egc.lock);\n \tpr_debug(\"attempt to resize set %s from %u to %u, t %p\\n\",\n \t\t set-\u003ename, orig-\u003ehtable_bits, htable_bits, orig);\n \tfor (r = 0; r \u003c ahash_numof_locks(orig-\u003ehtable_bits); r++) {\n@@ -768,7 +779,7 @@ mtype_resize(struct ip_set *set, bool retried)\n \t * Kernel-side add cannot trigger a resize and userspace actions\n \t * are serialized by the mutex.\n \t */\n-\tlist_for_each_safe(l, lt, \u0026h-\u003ead) {\n+\tlist_for_each_safe(l, lt, \u0026orig-\u003ead) {\n \t\tx = list_entry(l, struct mtype_resize_ad, list);\n \t\tif (x-\u003ead == IPSET_ADD) {\n \t\t\tmtype_add(set, \u0026x-\u003ed, \u0026x-\u003eext, \u0026x-\u003emext, x-\u003eflags);\n@@ -792,11 +803,24 @@ mtype_resize(struct ip_set *set, bool retried)\n \n cleanup:\n \trcu_read_unlock_bh();\n-\tatomic_set(\u0026orig-\u003eref, 0);\n+\tspin_lock_bh(\u0026h-\u003egc.lock);\n+\torig-\u003eresizing = false;\n+\tspin_unlock_bh(\u0026h-\u003egc.lock);\n+\t/* Make sure parallel readers see that orig-\u003eresizing is false\n+\t * before we decrement uref */\n+\tsynchronize_rcu();\n \tatomic_dec(\u0026orig-\u003euref);\n \tmtype_ahash_destroy(set, t, false);\n \tif (ret == -EAGAIN)\n \t\tgoto retry;\n+\n+\t/* Cleanup the backlog of ADD/DEL elements */\n+\tspin_lock_bh(\u0026set-\u003elock);\n+\tlist_for_each_safe(l, lt, \u0026orig-\u003ead) {\n+\t\tlist_del(l);\n+\t\tkfree(l);\n+\t}\n+\tspin_unlock_bh(\u0026set-\u003elock);\n \tgoto out;\n \n hbwarn:\n@@ -860,15 +884,13 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,\n \tkey = HKEY(value, h-\u003einitval, t-\u003ehtable_bits);\n \tr = ahash_region(key);\n \tatomic_inc(\u0026t-\u003euref);\n+\trcu_read_unlock_bh();\n \telements = t-\u003ehregion[r].elements;\n \tmaxelem = t-\u003emaxelem;\n \tif (elements \u003e= maxelem) {\n \t\tu32 e;\n-\t\tif (SET_WITH_TIMEOUT(set)) {\n-\t\t\trcu_read_unlock_bh();\n+\t\tif (SET_WITH_TIMEOUT(set))\n \t\t\tmtype_gc_do(set, h, t, r);\n-\t\t\trcu_read_lock_bh();\n-\t\t}\n \t\tmaxelem = h-\u003emaxelem;\n \t\telements = 0;\n \t\tfor (e = 0; e \u003c ahash_numof_locks(t-\u003ehtable_bits); e++)\n@@ -876,7 +898,6 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,\n \t\tif (elements \u003e= maxelem \u0026\u0026 SET_WITH_FORCEADD(set))\n \t\t\tforceadd = true;\n \t}\n-\trcu_read_unlock_bh();\n \n \tspin_lock_bh(\u0026t-\u003ehregion[r].lock);\n \tn = rcu_dereference_bh(hbucket(t, key));\n@@ -1003,7 +1024,7 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,\n \tret = 0;\n resize:\n \tspin_unlock_bh(\u0026t-\u003ehregion[r].lock);\n-\tif (atomic_read(\u0026t-\u003eref) \u0026\u0026 ext-\u003etarget) {\n+\tif (t-\u003eresizing \u0026\u0026 ext \u0026\u0026 ext-\u003etarget) {\n \t\t/* Resize is in process and kernel side add, save values */\n \t\tstruct mtype_resize_ad *x;\n \n@@ -1017,7 +1038,7 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,\n \t\tmemcpy(\u0026x-\u003emext, mext, sizeof(struct ip_set_ext));\n \t\tx-\u003eflags = flags;\n \t\tspin_lock_bh(\u0026set-\u003elock);\n-\t\tlist_add_tail(\u0026x-\u003elist, \u0026h-\u003ead);\n+\t\tlist_add_tail(\u0026x-\u003elist, \u0026t-\u003ead);\n \t\tspin_unlock_bh(\u0026set-\u003elock);\n \t}\n \tgoto out;\n@@ -1030,7 +1051,7 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,\n unlock:\n \tspin_unlock_bh(\u0026t-\u003ehregion[r].lock);\n out:\n-\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 atomic_read(\u0026t-\u003eref)) {\n+\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 t-\u003eresizing) {\n \t\tpr_debug(\"Table destroy after resize by add: %p\\n\", t);\n \t\tmtype_ahash_destroy(set, t, false);\n \t}\n@@ -1093,7 +1114,7 @@ mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext,\n #endif\n \t\tip_set_ext_destroy(set, data);\n \n-\t\tif (atomic_read(\u0026t-\u003eref) \u0026\u0026 ext-\u003etarget) {\n+\t\tif (t-\u003eresizing \u0026\u0026 ext \u0026\u0026 ext-\u003etarget) {\n \t\t\t/* Resize is in process and kernel side del,\n \t\t\t * save values\n \t\t\t */\n@@ -1141,10 +1162,10 @@ mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext,\n \tspin_unlock_bh(\u0026t-\u003ehregion[r].lock);\n \tif (x) {\n \t\tspin_lock_bh(\u0026set-\u003elock);\n-\t\tlist_add(\u0026x-\u003elist, \u0026h-\u003ead);\n+\t\tlist_add(\u0026x-\u003elist, \u0026t-\u003ead);\n \t\tspin_unlock_bh(\u0026set-\u003elock);\n \t}\n-\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 atomic_read(\u0026t-\u003eref)) {\n+\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 t-\u003eresizing) {\n \t\tpr_debug(\"Table destroy after resize by del: %p\\n\", t);\n \t\tmtype_ahash_destroy(set, t, false);\n \t}\n@@ -1353,7 +1374,7 @@ mtype_uref(struct ip_set *set, struct netlink_callback *cb, bool start)\n \t\trcu_read_unlock_bh();\n \t} else if (cb-\u003eargs[IPSET_CB_PRIVATE]) {\n \t\tt = (struct htable *)cb-\u003eargs[IPSET_CB_PRIVATE];\n-\t\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 atomic_read(\u0026t-\u003eref)) {\n+\t\tif (atomic_dec_and_test(\u0026t-\u003euref) \u0026\u0026 t-\u003eresizing) {\n \t\t\tpr_debug(\"Table destroy after resize \"\n \t\t\t\t \" by dump: %p\\n\", t);\n \t\t\tmtype_ahash_destroy(set, t, false);\n@@ -1566,7 +1587,13 @@ IPSET_TOKEN(HTYPE, _create)(struct net *net, struct ip_set *set,\n \tif (tb[IPSET_ATTR_MAXELEM])\n \t\tmaxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);\n \n-\thsize = sizeof(*h);\n+#ifdef IP_SET_PROTO_UNDEF\n+\thsize = sizeof(struct htype);\n+#else\n+\thsize = set-\u003efamily == NFPROTO_IPV6 ?\n+\t\tsizeof(struct IPSET_TOKEN(HTYPE, 6)) :\n+\t\tsizeof(struct IPSET_TOKEN(HTYPE, 4));\n+#endif\n \th = kzalloc(hsize, GFP_KERNEL);\n \tif (!h)\n \t\treturn -ENOMEM;\n@@ -1593,6 +1620,7 @@ IPSET_TOKEN(HTYPE, _create)(struct net *net, struct ip_set *set,\n \t\treturn -ENOMEM;\n \t}\n \th-\u003egc.set = set;\n+\tspin_lock_init(\u0026h-\u003egc.lock);\n \tfor (i = 0; i \u003c ahash_numof_locks(hbits); i++)\n \t\tspin_lock_init(\u0026t-\u003ehregion[i].lock);\n \th-\u003emaxelem = maxelem;\n@@ -1619,9 +1647,8 @@ IPSET_TOKEN(HTYPE, _create)(struct net *net, struct ip_set *set,\n \t}\n \tt-\u003ehtable_bits = hbits;\n \tt-\u003emaxelem = h-\u003emaxelem / ahash_numof_locks(hbits);\n+\tINIT_LIST_HEAD(\u0026t-\u003ead);\n \tRCU_INIT_POINTER(h-\u003etable, t);\n-\n-\tINIT_LIST_HEAD(\u0026h-\u003ead);\n \tset-\u003edata = h;\n #ifndef IP_SET_PROTO_UNDEF\n \tif (set-\u003efamily == NFPROTO_IPV4) {\ndiff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c\nindex 906f2c36167638..35cbe821c25967 100644\n--- a/net/netfilter/ipvs/ip_vs_core.c\n+++ b/net/netfilter/ipvs/ip_vs_core.c\n@@ -398,10 +398,10 @@ ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc)\n static inline void\n ip_vs_set_state(struct ip_vs_conn *cp, int direction,\n \t\tconst struct sk_buff *skb,\n-\t\tstruct ip_vs_proto_data *pd)\n+\t\tstruct ip_vs_proto_data *pd, unsigned int iph_len)\n {\n \tif (likely(pd-\u003epp-\u003estate_transition))\n-\t\tpd-\u003epp-\u003estate_transition(cp, direction, skb, pd);\n+\t\tpd-\u003epp-\u003estate_transition(cp, direction, skb, pd, iph_len);\n }\n \n static inline int\n@@ -803,7 +803,7 @@ int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,\n \t\tip_vs_in_stats(cp, skb);\n \n \t\t/* set state */\n-\t\tip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);\n+\t\tip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd, iph-\u003elen);\n \n \t\t/* transmit the first SYN packet */\n \t\tret = cp-\u003epacket_xmit(skb, cp, pd-\u003epp, iph);\n@@ -1484,7 +1484,7 @@ handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,\n \n after_nat:\n \tip_vs_out_stats(cp, skb);\n-\tip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd);\n+\tip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd, iph-\u003elen);\n \tskb-\u003eipvs_property = 1;\n \tif (!(cp-\u003eflags \u0026 IP_VS_CONN_F_NFCT))\n \t\tip_vs_notrack(skb);\n@@ -1767,6 +1767,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n \tbool tunnel, new_cp = false;\n \tunion nf_inet_addr *raddr;\n \tchar *outer_proto = \"IPIP\";\n+\tunsigned int hlen_ipip;\n \tint ulen = 0;\n \n \t*related = 1;\n@@ -1804,9 +1805,10 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n \t/* Now find the contained IP header */\n \toffset += sizeof(_icmph);\n \tcih = skb_header_pointer(skb, offset, sizeof(_ciph), \u0026_ciph);\n-\tif (cih == NULL)\n+\tif (!(cih \u0026\u0026 cih-\u003eversion == 4 \u0026\u0026 cih-\u003eihl \u003e= 5))\n \t\treturn NF_ACCEPT; /* The packet looks wrong, ignore */\n \traddr = (union nf_inet_addr *)\u0026cih-\u003edaddr;\n+\thlen_ipip = cih-\u003eihl * 4;\n \n \t/* Special case for errors for IPIP/UDP/GRE tunnel packets */\n \ttunnel = false;\n@@ -1822,9 +1824,9 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n \t\t/* Only for known tunnel */\n \t\tif (!dest || dest-\u003etun_type != IP_VS_CONN_F_TUNNEL_TYPE_IPIP)\n \t\t\treturn NF_ACCEPT;\n-\t\toffset += cih-\u003eihl * 4;\n+\t\toffset += hlen_ipip;\n \t\tcih = skb_header_pointer(skb, offset, sizeof(_ciph), \u0026_ciph);\n-\t\tif (cih == NULL)\n+\t\tif (!(cih \u0026\u0026 cih-\u003eversion == 4 \u0026\u0026 cih-\u003eihl \u003e= 5))\n \t\t\treturn NF_ACCEPT; /* The packet looks wrong, ignore */\n \t\ttunnel = true;\n \t} else if ((cih-\u003eprotocol == IPPROTO_UDP ||\t/* Can be UDP encap */\n@@ -1836,7 +1838,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n \t\t/* Non-first fragment has no UDP/GRE header */\n \t\tif (unlikely(cih-\u003efrag_off \u0026 htons(IP_OFFSET)))\n \t\t\treturn NF_ACCEPT;\n-\t\toffset2 = offset + cih-\u003eihl * 4;\n+\t\toffset2 = offset + hlen_ipip;\n \t\tif (cih-\u003eprotocol == IPPROTO_UDP) {\n \t\t\tulen = ipvs_udp_decap(ipvs, skb, offset2, AF_INET,\n \t\t\t\t\t      raddr, \u0026iproto);\n@@ -1905,6 +1907,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n \t}\n \n \tif (tunnel) {\n+\t\tunsigned int hlen_orig = cih-\u003eihl * 4;\n \t\t__be32 info = ic-\u003eun.gateway;\n \t\t__u8 type = ic-\u003etype;\n \t\t__u8 code = ic-\u003ecode;\n@@ -1921,6 +1924,9 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n \t\t\t\tgoto ignore_tunnel;\n \t\t\toffset2 -= ihl + sizeof(_icmph);\n \t\t\tskb_reset_network_header(skb);\n+\t\t\t/* Ensure the IP header is present in headroom */\n+\t\t\tif (!pskb_may_pull(skb, hlen_ipip))\n+\t\t\t\tgoto ignore_tunnel;\n \t\t\tIP_VS_DBG(12, \"ICMP for %s %pI4-\u003e%pI4: mtu=%u\\n\",\n \t\t\t\t  outer_proto, \u0026ip_hdr(skb)-\u003esaddr,\n \t\t\t\t  \u0026ip_hdr(skb)-\u003edaddr, mtu);\n@@ -1936,8 +1942,8 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n \t\t\t\tif (dest_dst)\n \t\t\t\t\tmtu = dst_mtu(dest_dst-\u003edst_cache);\n \t\t\t}\n-\t\t\tif (mtu \u003e 68 + sizeof(struct iphdr) + ulen)\n-\t\t\t\tmtu -= sizeof(struct iphdr) + ulen;\n+\t\t\tif (mtu \u003e 68 + hlen_ipip + ulen)\n+\t\t\t\tmtu -= hlen_ipip + ulen;\n \t\t\tinfo = htonl(mtu);\n \t\t}\n \t\t/* Strip outer IP, ICMP and IPIP/UDP/GRE, go to IP header of\n@@ -1946,6 +1952,9 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n \t\tif (pskb_pull(skb, offset2) == NULL)\n \t\t\tgoto ignore_tunnel;\n \t\tskb_reset_network_header(skb);\n+\t\t/* Ensure the IP header is present in headroom */\n+\t\tif (!pskb_may_pull(skb, hlen_orig))\n+\t\t\tgoto ignore_tunnel;\n \t\tIP_VS_DBG(12, \"Sending ICMP for %pI4-\u003e%pI4: t=%u, c=%u, i=%u\\n\",\n \t\t\t\u0026ip_hdr(skb)-\u003esaddr, \u0026ip_hdr(skb)-\u003edaddr,\n \t\t\ttype, code, ntohl(info));\n@@ -2233,7 +2242,7 @@ ip_vs_in_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state\n \tIP_VS_DBG_PKT(11, af, pp, skb, iph.off, \"Incoming packet\");\n \n \tip_vs_in_stats(cp, skb);\n-\tip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);\n+\tip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd, iph.len);\n \tif (cp-\u003epacket_xmit)\n \t\tret = cp-\u003epacket_xmit(skb, cp, pp, \u0026iph);\n \t\t/* do not touch skb anymore */\ndiff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c\nindex 63c78a1f3918a7..c67317be17dfaf 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_sctp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c\n@@ -372,20 +372,15 @@ static const char *sctp_state_name(int state)\n \n static inline void\n set_sctp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,\n-\t\tint direction, const struct sk_buff *skb)\n+\t\tint direction, const struct sk_buff *skb,\n+\t\tunsigned int iph_len)\n {\n \tstruct sctp_chunkhdr _sctpch, *sch;\n \tunsigned char chunk_type;\n \tint event, next_state;\n-\tint ihl, cofs;\n+\tint cofs;\n \n-#ifdef CONFIG_IP_VS_IPV6\n-\tihl = cp-\u003eaf == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);\n-#else\n-\tihl = ip_hdrlen(skb);\n-#endif\n-\n-\tcofs = ihl + sizeof(struct sctphdr);\n+\tcofs = iph_len + sizeof(struct sctphdr);\n \tsch = skb_header_pointer(skb, cofs, sizeof(_sctpch), \u0026_sctpch);\n \tif (sch == NULL)\n \t\treturn;\n@@ -468,10 +463,11 @@ set_sctp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,\n \n static void\n sctp_state_transition(struct ip_vs_conn *cp, int direction,\n-\t\tconst struct sk_buff *skb, struct ip_vs_proto_data *pd)\n+\t\tconst struct sk_buff *skb, struct ip_vs_proto_data *pd,\n+\t\tunsigned int iph_len)\n {\n \tspin_lock_bh(\u0026cp-\u003elock);\n-\tset_sctp_state(pd, cp, direction, skb);\n+\tset_sctp_state(pd, cp, direction, skb, iph_len);\n \tspin_unlock_bh(\u0026cp-\u003elock);\n }\n \ndiff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c\nindex 8cc0a8ce624112..f86b763efcc4dc 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_tcp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c\n@@ -579,17 +579,12 @@ set_tcp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,\n static void\n tcp_state_transition(struct ip_vs_conn *cp, int direction,\n \t\t     const struct sk_buff *skb,\n-\t\t     struct ip_vs_proto_data *pd)\n+\t\t     struct ip_vs_proto_data *pd,\n+\t\t     unsigned int iph_len)\n {\n \tstruct tcphdr _tcph, *th;\n \n-#ifdef CONFIG_IP_VS_IPV6\n-\tint ihl = cp-\u003eaf == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);\n-#else\n-\tint ihl = ip_hdrlen(skb);\n-#endif\n-\n-\tth = skb_header_pointer(skb, ihl, sizeof(_tcph), \u0026_tcph);\n+\tth = skb_header_pointer(skb, iph_len, sizeof(_tcph), \u0026_tcph);\n \tif (th == NULL)\n \t\treturn;\n \ndiff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c\nindex f9de632e38cdd6..58f9e255927e2e 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_udp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c\n@@ -444,7 +444,8 @@ static const char * udp_state_name(int state)\n static void\n udp_state_transition(struct ip_vs_conn *cp, int direction,\n \t\t     const struct sk_buff *skb,\n-\t\t     struct ip_vs_proto_data *pd)\n+\t\t     struct ip_vs_proto_data *pd,\n+\t\t     unsigned int iph_len)\n {\n \tif (unlikely(!pd)) {\n \t\tpr_err(\"UDP no ns data\\n\");\ndiff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c\nindex 99c5b9d671a0ca..2a829b5e8240a7 100644\n--- a/net/netfilter/nf_flow_table_core.c\n+++ b/net/netfilter/nf_flow_table_core.c\n@@ -127,12 +127,18 @@ static int flow_offload_fill_route(struct flow_offload *flow,\n \n \tswitch (route-\u003etuple[dir].xmit_type) {\n \tcase FLOW_OFFLOAD_XMIT_DIRECT:\n+\t\tif (flow_tuple-\u003etun_num) {\n+\t\t\tflow_tuple-\u003edst_cache = dst;\n+\t\t\tflow_tuple-\u003edst_cookie =\n+\t\t\t\tflow_offload_dst_cookie(flow_tuple);\n+\t\t}\n \t\tmemcpy(flow_tuple-\u003eout.h_dest, route-\u003etuple[dir].out.h_dest,\n \t\t       ETH_ALEN);\n \t\tmemcpy(flow_tuple-\u003eout.h_source, route-\u003etuple[dir].out.h_source,\n \t\t       ETH_ALEN);\n \t\tflow_tuple-\u003eout.ifidx = route-\u003etuple[dir].out.ifindex;\n-\t\tdst_release(dst);\n+\t\tif (!flow_tuple-\u003etun_num)\n+\t\t\tdst_release(dst);\n \t\tbreak;\n \tcase FLOW_OFFLOAD_XMIT_XFRM:\n \tcase FLOW_OFFLOAD_XMIT_NEIGH:\n@@ -152,9 +158,7 @@ static int flow_offload_fill_route(struct flow_offload *flow,\n static void nft_flow_dst_release(struct flow_offload *flow,\n \t\t\t\t enum flow_offload_tuple_dir dir)\n {\n-\tif (flow-\u003etuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH ||\n-\t    flow-\u003etuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM)\n-\t\tdst_release(flow-\u003etuplehash[dir].tuple.dst_cache);\n+\tdst_release(flow-\u003etuplehash[dir].tuple.dst_cache);\n }\n \n void flow_offload_route_init(struct flow_offload *flow,\n@@ -345,10 +349,8 @@ int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow)\n \n \tnf_ct_refresh(flow-\u003ect, NF_CT_DAY);\n \n-\tif (nf_flowtable_hw_offload(flow_table)) {\n-\t\t__set_bit(NF_FLOW_HW, \u0026flow-\u003eflags);\n+\tif (nf_flowtable_hw_offload(flow_table))\n \t\tnf_flow_offload_add(flow_table, flow);\n-\t}\n \n \treturn 0;\n }\n@@ -369,7 +371,8 @@ void flow_offload_refresh(struct nf_flowtable *flow_table,\n \t    test_bit(NF_FLOW_CLOSING, \u0026flow-\u003eflags))\n \t\treturn;\n \n-\tnf_flow_offload_add(flow_table, flow);\n+\tif (test_bit(NF_FLOW_HW, \u0026flow-\u003eflags))\n+\t\tnf_flow_offload_refresh(flow_table, flow);\n }\n EXPORT_SYMBOL_GPL(flow_offload_refresh);\n \ndiff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c\nindex 29e93ac1e2e400..0b78decce8a9bd 100644\n--- a/net/netfilter/nf_flow_table_ip.c\n+++ b/net/netfilter/nf_flow_table_ip.c\n@@ -299,8 +299,7 @@ static bool nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)\n \n static inline bool nf_flow_dst_check(struct flow_offload_tuple *tuple)\n {\n-\tif (tuple-\u003exmit_type != FLOW_OFFLOAD_XMIT_NEIGH \u0026\u0026\n-\t    tuple-\u003exmit_type != FLOW_OFFLOAD_XMIT_XFRM)\n+\tif (!tuple-\u003edst_cache)\n \t\treturn true;\n \n \treturn dst_check(tuple-\u003edst_cache, tuple-\u003edst_cookie);\n@@ -590,10 +589,10 @@ static int nf_flow_pppoe_push(struct sk_buff *skb, u16 id,\n \n static int nf_flow_tunnel_ipip_push(struct net *net, struct sk_buff *skb,\n \t\t\t\t    struct flow_offload_tuple *tuple,\n-\t\t\t\t    __be32 *ip_daddr)\n+\t\t\t\t    struct dst_entry *dst, __be32 *ip_daddr)\n {\n \tstruct iphdr *iph = (struct iphdr *)skb_network_header(skb);\n-\tstruct rtable *rt = dst_rtable(tuple-\u003edst_cache);\n+\tstruct rtable *rt = dst_rtable(dst);\n \tu8 tos = iph-\u003etos, ttl = iph-\u003ettl;\n \t__be16 frag_off = iph-\u003efrag_off;\n \tu32 headroom = sizeof(*iph);\n@@ -636,21 +635,22 @@ static int nf_flow_tunnel_ipip_push(struct net *net, struct sk_buff *skb,\n \n static int nf_flow_tunnel_v4_push(struct net *net, struct sk_buff *skb,\n \t\t\t\t  struct flow_offload_tuple *tuple,\n-\t\t\t\t  __be32 *ip_daddr)\n+\t\t\t\t  struct dst_entry *dst,  __be32 *ip_daddr)\n {\n \tif (tuple-\u003etun_num)\n-\t\treturn nf_flow_tunnel_ipip_push(net, skb, tuple, ip_daddr);\n+\t\treturn nf_flow_tunnel_ipip_push(net, skb, tuple, dst, ip_daddr);\n \n \treturn 0;\n }\n \n static int nf_flow_tunnel_ip6ip6_push(struct net *net, struct sk_buff *skb,\n \t\t\t\t      struct flow_offload_tuple *tuple,\n+\t\t\t\t      struct dst_entry *dst,\n \t\t\t\t      struct in6_addr **ip6_daddr)\n {\n \tstruct ipv6hdr *ip6h = (struct ipv6hdr *)skb_network_header(skb);\n-\tstruct rtable *rt = dst_rtable(tuple-\u003edst_cache);\n \t__u8 dsfield = ipv6_get_dsfield(ip6h);\n+\tstruct rtable *rt = dst_rtable(dst);\n \tstruct flowi6 fl6 = {\n \t\t.daddr = tuple-\u003etun.src_v6,\n \t\t.saddr = tuple-\u003etun.dst_v6,\n@@ -696,10 +696,11 @@ static int nf_flow_tunnel_ip6ip6_push(struct net *net, struct sk_buff *skb,\n \n static int nf_flow_tunnel_v6_push(struct net *net, struct sk_buff *skb,\n \t\t\t\t  struct flow_offload_tuple *tuple,\n+\t\t\t\t  struct dst_entry *dst,\n \t\t\t\t  struct in6_addr **ip6_daddr)\n {\n \tif (tuple-\u003etun_num)\n-\t\treturn nf_flow_tunnel_ip6ip6_push(net, skb, tuple, ip6_daddr);\n+\t\treturn nf_flow_tunnel_ip6ip6_push(net, skb, tuple, dst, ip6_daddr);\n \n \treturn 0;\n }\n@@ -842,7 +843,8 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,\n \tother_tuple = \u0026flow-\u003etuplehash[!dir].tuple;\n \tip_daddr = other_tuple-\u003esrc_v4.s_addr;\n \n-\tif (nf_flow_tunnel_v4_push(state-\u003enet, skb, other_tuple, \u0026ip_daddr) \u003c 0)\n+\tif (nf_flow_tunnel_v4_push(state-\u003enet, skb, other_tuple,\n+\t\t\t\t   tuplehash-\u003etuple.dst_cache, \u0026ip_daddr) \u003c 0)\n \t\treturn NF_DROP;\n \n \tswitch (tuplehash-\u003etuple.xmit_type) {\n@@ -1158,6 +1160,7 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,\n \tip6_daddr = \u0026other_tuple-\u003esrc_v6;\n \n \tif (nf_flow_tunnel_v6_push(state-\u003enet, skb, other_tuple,\n+\t\t\t\t   tuplehash-\u003etuple.dst_cache,\n \t\t\t\t   \u0026ip6_daddr) \u003c 0)\n \t\treturn NF_DROP;\n \ndiff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c\nindex 002ec15d988bdb..801a3dd9ceea3d 100644\n--- a/net/netfilter/nf_flow_table_offload.c\n+++ b/net/netfilter/nf_flow_table_offload.c\n@@ -1101,9 +1101,17 @@ nf_flow_offload_work_alloc(struct nf_flowtable *flowtable,\n \treturn offload;\n }\n \n+static bool nf_flow_offload_unsupported(struct flow_offload *flow)\n+{\n+\tif (flow-\u003etuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.tun_num ||\n+\t    flow-\u003etuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.tun_num)\n+\t\treturn true;\n \n-void nf_flow_offload_add(struct nf_flowtable *flowtable,\n-\t\t\t struct flow_offload *flow)\n+\treturn false;\n+}\n+\n+void nf_flow_offload_refresh(struct nf_flowtable *flowtable,\n+\t\t\t     struct flow_offload *flow)\n {\n \tstruct flow_offload_work *offload;\n \n@@ -1114,6 +1122,16 @@ void nf_flow_offload_add(struct nf_flowtable *flowtable,\n \tflow_offload_queue_work(offload);\n }\n \n+void nf_flow_offload_add(struct nf_flowtable *flowtable,\n+\t\t\t struct flow_offload *flow)\n+{\n+\tif (nf_flow_offload_unsupported(flow))\n+\t\treturn;\n+\n+\tset_bit(NF_FLOW_HW, \u0026flow-\u003eflags);\n+\tnf_flow_offload_refresh(flowtable, flow);\n+}\n+\n void nf_flow_offload_del(struct nf_flowtable *flowtable,\n \t\t\t struct flow_offload *flow)\n {\ndiff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c\nindex fa36575998616f..5fee61b3813cbc 100644\n--- a/net/netfilter/nfnetlink_log.c\n+++ b/net/netfilter/nfnetlink_log.c\n@@ -676,7 +676,7 @@ __build_packet_message(struct nfnl_log_net *log,\n \t\t\tgoto nla_put_failure;\n \n \t\tif (skb_copy_bits(skb, 0, nla_data(nla), data_len))\n-\t\t\tBUG();\n+\t\t\tgoto nla_put_failure;\n \t}\n \n \tnlh-\u003enlmsg_len = inst-\u003eskb-\u003etail - old_tail;\n@@ -698,6 +698,21 @@ static const struct nf_loginfo default_loginfo = {\n \t},\n };\n \n+static unsigned int nfulnl_get_copy_len(const struct nf_loginfo *li,\n+\t\t\t\t\tconst struct sk_buff *skb,\n+\t\t\t\t\tunsigned int copy_len)\n+{\n+\tunsigned int len = skb-\u003elen;\n+\n+\tif ((li-\u003eu.ulog.flags \u0026 NF_LOG_F_COPY_LEN) \u0026\u0026\n+\t    li-\u003eu.ulog.copy_len \u003c copy_len)\n+\t\tcopy_len = li-\u003eu.ulog.copy_len;\n+\tif (!skb_frags_readable(skb))\n+\t\tlen = skb_headlen(skb);\n+\n+\treturn min(len, copy_len);\n+}\n+\n /* log handler for internal netfilter logging api */\n static void\n nfulnl_log_packet(struct net *net,\n@@ -790,14 +805,7 @@ nfulnl_log_packet(struct net *net,\n \t\tbreak;\n \n \tcase NFULNL_COPY_PACKET:\n-\t\tdata_len = inst-\u003ecopy_range;\n-\t\tif ((li-\u003eu.ulog.flags \u0026 NF_LOG_F_COPY_LEN) \u0026\u0026\n-\t\t    (li-\u003eu.ulog.copy_len \u003c data_len))\n-\t\t\tdata_len = li-\u003eu.ulog.copy_len;\n-\n-\t\tif (data_len \u003e skb-\u003elen)\n-\t\t\tdata_len = skb-\u003elen;\n-\n+\t\tdata_len = nfulnl_get_copy_len(li, skb, inst-\u003ecopy_range);\n \t\tsize += nla_total_size(data_len);\n \t\tbreak;\n \ndiff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c\nindex 35d4c6c628ffc1..b8aaf39cb4d8ea 100644\n--- a/net/netfilter/nfnetlink_queue.c\n+++ b/net/netfilter/nfnetlink_queue.c\n@@ -690,6 +690,17 @@ static int nfqnl_put_master_ifindex(struct sk_buff *nlskb, int attr,\n }\n #endif\n \n+static unsigned int nfqnl_get_data_len(const struct sk_buff *entskb,\n+\t\t\t\t       unsigned int copy_range)\n+{\n+\tunsigned int data_len = entskb-\u003elen;\n+\n+\tif (!skb_frags_readable(entskb))\n+\t\tdata_len = skb_headlen(entskb);\n+\n+\treturn min(data_len, copy_range);\n+}\n+\n static struct sk_buff *\n nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,\n \t\t\t   struct nf_queue_entry *entry,\n@@ -755,10 +766,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,\n \t\t    nf_queue_checksum_help(entskb))\n \t\t\treturn NULL;\n \n-\t\tdata_len = READ_ONCE(queue-\u003ecopy_range);\n-\t\tif (data_len \u003e entskb-\u003elen)\n-\t\t\tdata_len = entskb-\u003elen;\n-\n+\t\tdata_len = nfqnl_get_data_len(entskb, READ_ONCE(queue-\u003ecopy_range));\n \t\thlen = skb_zerocopy_headlen(entskb);\n \t\thlen = min_t(unsigned int, hlen, data_len);\n \t\tsize += sizeof(struct nlattr) + hlen;\ndiff --git a/net/netfilter/nft_lookup.c b/net/netfilter/nft_lookup.c\nindex ba512e94b4023f..19887439847d11 100644\n--- a/net/netfilter/nft_lookup.c\n+++ b/net/netfilter/nft_lookup.c\n@@ -103,13 +103,13 @@ void nft_lookup_eval(const struct nft_expr *expr,\n \tbool found;\n \n \text = nft_set_do_lookup(net, set, \u0026regs-\u003edata[priv-\u003esreg]);\n+\tif (!ext)\n+\t\text = nft_set_catchall_lookup(net, set);\n+\n \tfound = !!ext ^ priv-\u003einvert;\n \tif (!found) {\n-\t\text = nft_set_catchall_lookup(net, set);\n-\t\tif (!ext) {\n-\t\t\tregs-\u003everdict.code = NFT_BREAK;\n-\t\t\treturn;\n-\t\t}\n+\t\tregs-\u003everdict.code = NFT_BREAK;\n+\t\treturn;\n \t}\n \n \tif (ext) {\ndiff --git a/net/netfilter/xt_u32.c b/net/netfilter/xt_u32.c\nindex ec1a21e3b6e2c3..dabbaa742874cb 100644\n--- a/net/netfilter/xt_u32.c\n+++ b/net/netfilter/xt_u32.c\n@@ -14,8 +14,8 @@\n #include \u003clinux/netfilter/x_tables.h\u003e\n #include \u003clinux/netfilter/xt_u32.h\u003e\n \n-static bool u32_match_it(const struct xt_u32 *data,\n-\t\t\t const struct sk_buff *skb)\n+static int u32_match_it(const struct xt_u32 *data,\n+\t\t\tconst struct sk_buff *skb)\n {\n \tconst struct xt_u32_test *ct;\n \tunsigned int testind;\n@@ -40,7 +40,8 @@ static bool u32_match_it(const struct xt_u32 *data,\n \t\t\treturn false;\n \n \t\tif (skb_copy_bits(skb, pos, \u0026n, sizeof(n)) \u003c 0)\n-\t\t\tBUG();\n+\t\t\treturn -1;\n+\n \t\tval   = ntohl(n);\n \t\tnnums = ct-\u003ennums;\n \n@@ -68,7 +69,7 @@ static bool u32_match_it(const struct xt_u32 *data,\n \n \t\t\t\tif (skb_copy_bits(skb, at + pos, \u0026n,\n \t\t\t\t\t\t    sizeof(n)) \u003c 0)\n-\t\t\t\t\tBUG();\n+\t\t\t\t\treturn -1;\n \t\t\t\tval = ntohl(n);\n \t\t\t\tbreak;\n \t\t\t}\n@@ -90,9 +91,14 @@ static bool u32_match_it(const struct xt_u32 *data,\n static bool u32_mt(const struct sk_buff *skb, struct xt_action_param *par)\n {\n \tconst struct xt_u32 *data = par-\u003ematchinfo;\n-\tbool ret;\n+\tint ret;\n \n \tret = u32_match_it(data, skb);\n+\tif (ret \u003c 0) {\n+\t\tpar-\u003ehotdrop = true;\n+\t\treturn false;\n+\t}\n+\n \treturn ret ^ data-\u003einvert;\n }\n \n"
}

gemini-3.1-pro-preview

{
  "EnableConfigs": [
    "IP_VS",
    "IP_VS_PROTO_TCP",
    "IP_VS_PROTO_UDP",
    "IP_VS_PROTO_SCTP",
    "NF_FLOW_TABLE",
    "BRIDGE_NF_EBTABLES",
    "IP_SET",
    "IP_SET_HASH_IP",
    "NETFILTER_NETLINK_LOG",
    "NETFILTER_NETLINK_QUEUE",
    "NF_TABLES",
    "NETFILTER_XT_MATCH_U32",
    "NF_DEFRAG_IPV6"
  ],
  "FocusSymbols": [
    "ip_vs_in_icmp",
    "sctp_state_transition",
    "tcp_state_transition",
    "udp_state_transition",
    "flow_offload_route_init",
    "nf_flow_offload_ip_hook",
    "nf_flow_offload_ipv6_hook",
    "nf_flow_offload_add",
    "nf_flow_offload_refresh",
    "ebt_check_entry",
    "do_ebt_set_ctl",
    "compat_do_replace",
    "nf_ct_frag6_gather",
    "hash_ip4_gc",
    "hash_ip4_resize",
    "hash_ip4_add",
    "hash_ip4_del",
    "hash_ip6_gc",
    "hash_ip6_resize",
    "hash_ip6_add",
    "hash_ip6_del",
    "nfulnl_log_packet",
    "nfqnl_build_packet_message",
    "nft_lookup_eval",
    "u32_mt"
  ],
  "Reasoning": "The patch contains functional changes to various netfilter and ipvs components, fixing potential out-of-bounds reads, incorrect header length calculations, and synchronization issues. It modifies reachable core kernel logic and should be fuzzed.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. List them in the EnableConfigs output array,
   and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

For your convenience, here is the diff of the changes:
commit d172f8e019d60662a8e73adbe4a86161cec84419
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Jul 9 06:57:34 2026 +0000

    syz-cluster: applied patch under review

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 49297fec448a82..417ff51f62fc8e 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -752,7 +752,8 @@ struct ip_vs_protocol {
 
 	void (*state_transition)(struct ip_vs_conn *cp, int direction,
 				 const struct sk_buff *skb,
-				 struct ip_vs_proto_data *pd);
+				 struct ip_vs_proto_data *pd,
+				 unsigned int iph_len);
 
 	int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
 
diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h
index 7b23b245a5a86a..ce414118962f54 100644
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -155,11 +155,12 @@ struct flow_offload_tuple {
 					tun_num:2,
 					in_vlan_ingress:2;
 	u16				mtu;
+	u32				dst_cookie;
+	struct dst_entry		*dst_cache;
+
 	union {
 		struct {
-			struct dst_entry *dst_cache;
 			u32		ifidx;
-			u32		dst_cookie;
 		};
 		struct {
 			u32		ifidx;
@@ -357,6 +358,8 @@ static inline int nf_flow_register_bpf(void)
 
 void nf_flow_offload_add(struct nf_flowtable *flowtable,
 			 struct flow_offload *flow);
+void nf_flow_offload_refresh(struct nf_flowtable *flowtable,
+			     struct flow_offload *flow);
 void nf_flow_offload_del(struct nf_flowtable *flowtable,
 			 struct flow_offload *flow);
 void nf_flow_offload_stats(struct nf_flowtable *flowtable,
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index f20c039e44c8d7..96c9a8f57c8702 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -403,6 +403,9 @@ ebt_check_match(struct ebt_entry_match *m, struct xt_mtchk_param *par,
 	    left - sizeof(struct ebt_entry_match) < m->match_size)
 		return -EINVAL;
 
+	if (strnlen(m->u.name, XT_EXTENSION_MAXNAMELEN) == XT_EXTENSION_MAXNAMELEN)
+		return -EINVAL;
+
 	match = xt_find_match(NFPROTO_BRIDGE, m->u.name, m->u.revision);
 	if (IS_ERR(match) || match->family != NFPROTO_BRIDGE) {
 		if (!IS_ERR(match))
@@ -921,8 +924,7 @@ static int translate_table(struct net *net, const char *name,
 		 * if an error occurs
 		 */
 		newinfo->chainstack =
-			vmalloc_array(nr_cpu_ids,
-				      sizeof(*(newinfo->chainstack)));
+			vcalloc(nr_cpu_ids, sizeof(*(newinfo->chainstack)));
 		if (!newinfo->chainstack)
 			return -ENOMEM;
 		for_each_possible_cpu(i) {
@@ -1434,6 +1436,8 @@ static int update_counters(struct net *net, sockptr_t arg, unsigned int len)
 	if (copy_from_sockptr(&hlp, arg, sizeof(hlp)))
 		return -EFAULT;
 
+	hlp.name[sizeof(hlp.name) - 1] = '\0';
+
 	if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))
 		return -EINVAL;
 
@@ -2273,6 +2277,8 @@ static int compat_copy_ebt_replace_from_user(struct ebt_replace *repl,
 
 	memcpy(repl, &tmp, offsetof(struct ebt_replace, hook_entry));
 
+	repl->name[sizeof(repl->name) - 1] = '\0';
+
 	/* starting with hook_entry, 32 vs. 64 bit structures are different */
 	for (i = 0; i < NF_BR_NUMHOOKS; i++)
 		repl->hook_entry[i] = compat_ptr(tmp.hook_entry[i]);
@@ -2395,6 +2401,8 @@ static int compat_update_counters(struct net *net, sockptr_t arg,
 	if (copy_from_sockptr(&hlp, arg, sizeof(hlp)))
 		return -EFAULT;
 
+	hlp.name[sizeof(hlp.name) - 1] = '\0';
+
 	/* try real handler in case userland supplied needed padding */
 	if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))
 		return update_counters(net, arg, len);
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 64ab23ff559bb9..599c49bf0a0afd 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -348,7 +348,8 @@ static int nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *skb,
 	skb_network_header(skb)[fq->nhoffset] = skb_transport_header(skb)[0];
 	memmove(skb->head + sizeof(struct frag_hdr), skb->head,
 		(skb->data - skb->head) - sizeof(struct frag_hdr));
-	skb->mac_header += sizeof(struct frag_hdr);
+	if (skb_mac_header_was_set(skb))
+		skb->mac_header += sizeof(struct frag_hdr);
 	skb->network_header += sizeof(struct frag_hdr);
 
 	skb_reset_transport_header(skb);
@@ -418,7 +419,7 @@ find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff)
 			return -1;
 		}
 		if (skb_copy_bits(skb, start, &hdr, sizeof(hdr)))
-			BUG();
+			return -1;
 		if (nexthdr == NEXTHDR_AUTH)
 			hdrlen = ipv6_authlen(&hdr);
 		else
diff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h
index dedf59b661ddf3..8231317b0f1f4b 100644
--- a/net/netfilter/ipset/ip_set_hash_gen.h
+++ b/net/netfilter/ipset/ip_set_hash_gen.h
@@ -75,15 +75,17 @@ struct hbucket {
 struct htable_gc {
 	struct delayed_work dwork;
 	struct ip_set *set;	/* Set the gc belongs to */
+	spinlock_t lock;	/* Lock to exclude gc and resize */
 	u32 region;		/* Last gc run position */
 };
 
 /* The hash table: the table size stored here in order to make resizing easy */
 struct htable {
-	atomic_t ref;		/* References for resizing */
+	bool resizing;		/* Mark ongoing resize */
 	atomic_t uref;		/* References for dumping and gc */
 	u8 htable_bits;		/* size of hash table == 2^htable_bits */
 	u32 maxelem;		/* Maxelem per region */
+	struct list_head ad;	/* Resize add|del backlist */
 	struct ip_set_region *hregion;	/* Region locks and ext sizes */
 	struct hbucket __rcu *bucket[]; /* hashtable buckets */
 };
@@ -301,11 +303,13 @@ struct htype {
 	u8 netmask;		/* netmask value for subnets to store */
 	union nf_inet_addr bitmask;	/* stores bitmask */
 #endif
-	struct list_head ad;	/* Resize add|del backlist */
-	struct mtype_elem next; /* temporary storage for uadd */
 #ifdef IP_SET_HASH_WITH_NETS
 	struct net_prefixes nets[NLEN]; /* book-keeping of prefixes */
 #endif
+	/* Because 'next' is IPv4/IPv6 dependent, no elements of this
+	 * structure and referred in create() may come after 'next'.
+	 */
+	struct mtype_elem next; /* temporary storage for uadd */
 };
 
 /* ADD|DEL entries saved during resize */
@@ -451,13 +455,14 @@ static void
 mtype_destroy(struct ip_set *set)
 {
 	struct htype *h = set->data;
+	struct htable *t = (__force struct htable *)h->table;
 	struct list_head *l, *lt;
 
-	mtype_ahash_destroy(set, (__force struct htable *)h->table, true);
-	list_for_each_safe(l, lt, &h->ad) {
+	list_for_each_safe(l, lt, &t->ad) {
 		list_del(l);
 		kfree(l);
 	}
+	mtype_ahash_destroy(set, t, true);
 	kfree(h);
 
 	set->data = NULL;
@@ -569,9 +574,10 @@ mtype_gc(struct work_struct *work)
 	set = gc->set;
 	h = set->data;
 
-	spin_lock_bh(&set->lock);
-	t = ipset_dereference_set(h->table, set);
+	rcu_read_lock_bh();
+	t = rcu_dereference_bh(h->table);
 	atomic_inc(&t->uref);
+	rcu_read_unlock_bh();
 	numof_locks = ahash_numof_locks(t->htable_bits);
 	r = gc->region++;
 	if (r >= numof_locks) {
@@ -580,11 +586,13 @@ mtype_gc(struct work_struct *work)
 	next_run = (IPSET_GC_PERIOD(set->timeout) * HZ) / numof_locks;
 	if (next_run < HZ/10)
 		next_run = HZ/10;
-	spin_unlock_bh(&set->lock);
 
-	mtype_gc_do(set, h, t, r);
+	spin_lock_bh(&gc->lock);
+	if (!t->resizing)
+		mtype_gc_do(set, h, t, r);
+	spin_unlock_bh(&gc->lock);
 
-	if (atomic_dec_and_test(&t->uref) && atomic_read(&t->ref)) {
+	if (atomic_dec_and_test(&t->uref) && t->resizing) {
 		pr_debug("Table destroy after resize by expire: %p\n", t);
 		mtype_ahash_destroy(set, t, false);
 	}
@@ -668,15 +676,18 @@ mtype_resize(struct ip_set *set, bool retried)
 	}
 	t->htable_bits = htable_bits;
 	t->maxelem = h->maxelem / ahash_numof_locks(htable_bits);
+	INIT_LIST_HEAD(&t->ad);
 	for (i = 0; i < ahash_numof_locks(htable_bits); i++)
 		spin_lock_init(&t->hregion[i].lock);
 
 	/* There can't be another parallel resizing,
-	 * but dumping, gc, kernel side add/del are possible
+	 * but dumping and kernel side add/del are possible
 	 */
 	orig = ipset_dereference_bh_nfnl(h->table);
-	atomic_set(&orig->ref, 1);
 	atomic_inc(&orig->uref);
+	spin_lock_bh(&h->gc.lock);
+	orig->resizing = true;
+	spin_unlock_bh(&h->gc.lock);
 	pr_debug("attempt to resize set %s from %u to %u, t %p\n",
 		 set->name, orig->htable_bits, htable_bits, orig);
 	for (r = 0; r < ahash_numof_locks(orig->htable_bits); r++) {
@@ -768,7 +779,7 @@ mtype_resize(struct ip_set *set, bool retried)
 	 * Kernel-side add cannot trigger a resize and userspace actions
 	 * are serialized by the mutex.
 	 */
-	list_for_each_safe(l, lt, &h->ad) {
+	list_for_each_safe(l, lt, &orig->ad) {
 		x = list_entry(l, struct mtype_resize_ad, list);
 		if (x->ad == IPSET_ADD) {
 			mtype_add(set, &x->d, &x->ext, &x->mext, x->flags);
@@ -792,11 +803,24 @@ mtype_resize(struct ip_set *set, bool retried)
 
 cleanup:
 	rcu_read_unlock_bh();
-	atomic_set(&orig->ref, 0);
+	spin_lock_bh(&h->gc.lock);
+	orig->resizing = false;
+	spin_unlock_bh(&h->gc.lock);
+	/* Make sure parallel readers see that orig->resizing is false
+	 * before we decrement uref */
+	synchronize_rcu();
 	atomic_dec(&orig->uref);
 	mtype_ahash_destroy(set, t, false);
 	if (ret == -EAGAIN)
 		goto retry;
+
+	/* Cleanup the backlog of ADD/DEL elements */
+	spin_lock_bh(&set->lock);
+	list_for_each_safe(l, lt, &orig->ad) {
+		list_del(l);
+		kfree(l);
+	}
+	spin_unlock_bh(&set->lock);
 	goto out;
 
 hbwarn:
@@ -860,15 +884,13 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 	key = HKEY(value, h->initval, t->htable_bits);
 	r = ahash_region(key);
 	atomic_inc(&t->uref);
+	rcu_read_unlock_bh();
 	elements = t->hregion[r].elements;
 	maxelem = t->maxelem;
 	if (elements >= maxelem) {
 		u32 e;
-		if (SET_WITH_TIMEOUT(set)) {
-			rcu_read_unlock_bh();
+		if (SET_WITH_TIMEOUT(set))
 			mtype_gc_do(set, h, t, r);
-			rcu_read_lock_bh();
-		}
 		maxelem = h->maxelem;
 		elements = 0;
 		for (e = 0; e < ahash_numof_locks(t->htable_bits); e++)
@@ -876,7 +898,6 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 		if (elements >= maxelem && SET_WITH_FORCEADD(set))
 			forceadd = true;
 	}
-	rcu_read_unlock_bh();
 
 	spin_lock_bh(&t->hregion[r].lock);
 	n = rcu_dereference_bh(hbucket(t, key));
@@ -1003,7 +1024,7 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 	ret = 0;
 resize:
 	spin_unlock_bh(&t->hregion[r].lock);
-	if (atomic_read(&t->ref) && ext->target) {
+	if (t->resizing && ext && ext->target) {
 		/* Resize is in process and kernel side add, save values */
 		struct mtype_resize_ad *x;
 
@@ -1017,7 +1038,7 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 		memcpy(&x->mext, mext, sizeof(struct ip_set_ext));
 		x->flags = flags;
 		spin_lock_bh(&set->lock);
-		list_add_tail(&x->list, &h->ad);
+		list_add_tail(&x->list, &t->ad);
 		spin_unlock_bh(&set->lock);
 	}
 	goto out;
@@ -1030,7 +1051,7 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 unlock:
 	spin_unlock_bh(&t->hregion[r].lock);
 out:
-	if (atomic_dec_and_test(&t->uref) && atomic_read(&t->ref)) {
+	if (atomic_dec_and_test(&t->uref) && t->resizing) {
 		pr_debug("Table destroy after resize by add: %p\n", t);
 		mtype_ahash_destroy(set, t, false);
 	}
@@ -1093,7 +1114,7 @@ mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 #endif
 		ip_set_ext_destroy(set, data);
 
-		if (atomic_read(&t->ref) && ext->target) {
+		if (t->resizing && ext && ext->target) {
 			/* Resize is in process and kernel side del,
 			 * save values
 			 */
@@ -1141,10 +1162,10 @@ mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext,
 	spin_unlock_bh(&t->hregion[r].lock);
 	if (x) {
 		spin_lock_bh(&set->lock);
-		list_add(&x->list, &h->ad);
+		list_add(&x->list, &t->ad);
 		spin_unlock_bh(&set->lock);
 	}
-	if (atomic_dec_and_test(&t->uref) && atomic_read(&t->ref)) {
+	if (atomic_dec_and_test(&t->uref) && t->resizing) {
 		pr_debug("Table destroy after resize by del: %p\n", t);
 		mtype_ahash_destroy(set, t, false);
 	}
@@ -1353,7 +1374,7 @@ mtype_uref(struct ip_set *set, struct netlink_callback *cb, bool start)
 		rcu_read_unlock_bh();
 	} else if (cb->args[IPSET_CB_PRIVATE]) {
 		t = (struct htable *)cb->args[IPSET_CB_PRIVATE];
-		if (atomic_dec_and_test(&t->uref) && atomic_read(&t->ref)) {
+		if (atomic_dec_and_test(&t->uref) && t->resizing) {
 			pr_debug("Table destroy after resize "
 				 " by dump: %p\n", t);
 			mtype_ahash_destroy(set, t, false);
@@ -1566,7 +1587,13 @@ IPSET_TOKEN(HTYPE, _create)(struct net *net, struct ip_set *set,
 	if (tb[IPSET_ATTR_MAXELEM])
 		maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
 
-	hsize = sizeof(*h);
+#ifdef IP_SET_PROTO_UNDEF
+	hsize = sizeof(struct htype);
+#else
+	hsize = set->family == NFPROTO_IPV6 ?
+		sizeof(struct IPSET_TOKEN(HTYPE, 6)) :
+		sizeof(struct IPSET_TOKEN(HTYPE, 4));
+#endif
 	h = kzalloc(hsize, GFP_KERNEL);
 	if (!h)
 		return -ENOMEM;
@@ -1593,6 +1620,7 @@ IPSET_TOKEN(HTYPE, _create)(struct net *net, struct ip_set *set,
 		return -ENOMEM;
 	}
 	h->gc.set = set;
+	spin_lock_init(&h->gc.lock);
 	for (i = 0; i < ahash_numof_locks(hbits); i++)
 		spin_lock_init(&t->hregion[i].lock);
 	h->maxelem = maxelem;
@@ -1619,9 +1647,8 @@ IPSET_TOKEN(HTYPE, _create)(struct net *net, struct ip_set *set,
 	}
 	t->htable_bits = hbits;
 	t->maxelem = h->maxelem / ahash_numof_locks(hbits);
+	INIT_LIST_HEAD(&t->ad);
 	RCU_INIT_POINTER(h->table, t);
-
-	INIT_LIST_HEAD(&h->ad);
 	set->data = h;
 #ifndef IP_SET_PROTO_UNDEF
 	if (set->family == NFPROTO_IPV4) {
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 906f2c36167638..35cbe821c25967 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -398,10 +398,10 @@ ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc)
 static inline void
 ip_vs_set_state(struct ip_vs_conn *cp, int direction,
 		const struct sk_buff *skb,
-		struct ip_vs_proto_data *pd)
+		struct ip_vs_proto_data *pd, unsigned int iph_len)
 {
 	if (likely(pd->pp->state_transition))
-		pd->pp->state_transition(cp, direction, skb, pd);
+		pd->pp->state_transition(cp, direction, skb, pd, iph_len);
 }
 
 static inline int
@@ -803,7 +803,7 @@ int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 		ip_vs_in_stats(cp, skb);
 
 		/* set state */
-		ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
+		ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd, iph->len);
 
 		/* transmit the first SYN packet */
 		ret = cp->packet_xmit(skb, cp, pd->pp, iph);
@@ -1484,7 +1484,7 @@ handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
 
 after_nat:
 	ip_vs_out_stats(cp, skb);
-	ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd);
+	ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd, iph->len);
 	skb->ipvs_property = 1;
 	if (!(cp->flags & IP_VS_CONN_F_NFCT))
 		ip_vs_notrack(skb);
@@ -1767,6 +1767,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 	bool tunnel, new_cp = false;
 	union nf_inet_addr *raddr;
 	char *outer_proto = "IPIP";
+	unsigned int hlen_ipip;
 	int ulen = 0;
 
 	*related = 1;
@@ -1804,9 +1805,10 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 	/* Now find the contained IP header */
 	offset += sizeof(_icmph);
 	cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
-	if (cih == NULL)
+	if (!(cih && cih->version == 4 && cih->ihl >= 5))
 		return NF_ACCEPT; /* The packet looks wrong, ignore */
 	raddr = (union nf_inet_addr *)&cih->daddr;
+	hlen_ipip = cih->ihl * 4;
 
 	/* Special case for errors for IPIP/UDP/GRE tunnel packets */
 	tunnel = false;
@@ -1822,9 +1824,9 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 		/* Only for known tunnel */
 		if (!dest || dest->tun_type != IP_VS_CONN_F_TUNNEL_TYPE_IPIP)
 			return NF_ACCEPT;
-		offset += cih->ihl * 4;
+		offset += hlen_ipip;
 		cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
-		if (cih == NULL)
+		if (!(cih && cih->version == 4 && cih->ihl >= 5))
 			return NF_ACCEPT; /* The packet looks wrong, ignore */
 		tunnel = true;
 	} else if ((cih->protocol == IPPROTO_UDP ||	/* Can be UDP encap */
@@ -1836,7 +1838,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 		/* Non-first fragment has no UDP/GRE header */
 		if (unlikely(cih->frag_off & htons(IP_OFFSET)))
 			return NF_ACCEPT;
-		offset2 = offset + cih->ihl * 4;
+		offset2 = offset + hlen_ipip;
 		if (cih->protocol == IPPROTO_UDP) {
 			ulen = ipvs_udp_decap(ipvs, skb, offset2, AF_INET,
 					      raddr, &iproto);
@@ -1905,6 +1907,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 	}
 
 	if (tunnel) {
+		unsigned int hlen_orig = cih->ihl * 4;
 		__be32 info = ic->un.gateway;
 		__u8 type = ic->type;
 		__u8 code = ic->code;
@@ -1921,6 +1924,9 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 				goto ignore_tunnel;
 			offset2 -= ihl + sizeof(_icmph);
 			skb_reset_network_header(skb);
+			/* Ensure the IP header is present in headroom */
+			if (!pskb_may_pull(skb, hlen_ipip))
+				goto ignore_tunnel;
 			IP_VS_DBG(12, "ICMP for %s %pI4->%pI4: mtu=%u\n",
 				  outer_proto, &ip_hdr(skb)->saddr,
 				  &ip_hdr(skb)->daddr, mtu);
@@ -1936,8 +1942,8 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 				if (dest_dst)
 					mtu = dst_mtu(dest_dst->dst_cache);
 			}
-			if (mtu > 68 + sizeof(struct iphdr) + ulen)
-				mtu -= sizeof(struct iphdr) + ulen;
+			if (mtu > 68 + hlen_ipip + ulen)
+				mtu -= hlen_ipip + ulen;
 			info = htonl(mtu);
 		}
 		/* Strip outer IP, ICMP and IPIP/UDP/GRE, go to IP header of
@@ -1946,6 +1952,9 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
 		if (pskb_pull(skb, offset2) == NULL)
 			goto ignore_tunnel;
 		skb_reset_network_header(skb);
+		/* Ensure the IP header is present in headroom */
+		if (!pskb_may_pull(skb, hlen_orig))
+			goto ignore_tunnel;
 		IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n",
 			&ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
 			type, code, ntohl(info));
@@ -2233,7 +2242,7 @@ ip_vs_in_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state
 	IP_VS_DBG_PKT(11, af, pp, skb, iph.off, "Incoming packet");
 
 	ip_vs_in_stats(cp, skb);
-	ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
+	ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd, iph.len);
 	if (cp->packet_xmit)
 		ret = cp->packet_xmit(skb, cp, pp, &iph);
 		/* do not touch skb anymore */
diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c
index 63c78a1f3918a7..c67317be17dfaf 100644
--- a/net/netfilter/ipvs/ip_vs_proto_sctp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c
@@ -372,20 +372,15 @@ static const char *sctp_state_name(int state)
 
 static inline void
 set_sctp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,
-		int direction, const struct sk_buff *skb)
+		int direction, const struct sk_buff *skb,
+		unsigned int iph_len)
 {
 	struct sctp_chunkhdr _sctpch, *sch;
 	unsigned char chunk_type;
 	int event, next_state;
-	int ihl, cofs;
+	int cofs;
 
-#ifdef CONFIG_IP_VS_IPV6
-	ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);
-#else
-	ihl = ip_hdrlen(skb);
-#endif
-
-	cofs = ihl + sizeof(struct sctphdr);
+	cofs = iph_len + sizeof(struct sctphdr);
 	sch = skb_header_pointer(skb, cofs, sizeof(_sctpch), &_sctpch);
 	if (sch == NULL)
 		return;
@@ -468,10 +463,11 @@ set_sctp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,
 
 static void
 sctp_state_transition(struct ip_vs_conn *cp, int direction,
-		const struct sk_buff *skb, struct ip_vs_proto_data *pd)
+		const struct sk_buff *skb, struct ip_vs_proto_data *pd,
+		unsigned int iph_len)
 {
 	spin_lock_bh(&cp->lock);
-	set_sctp_state(pd, cp, direction, skb);
+	set_sctp_state(pd, cp, direction, skb, iph_len);
 	spin_unlock_bh(&cp->lock);
 }
 
diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c
index 8cc0a8ce624112..f86b763efcc4dc 100644
--- a/net/netfilter/ipvs/ip_vs_proto_tcp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c
@@ -579,17 +579,12 @@ set_tcp_state(struct ip_vs_proto_data *pd, struct ip_vs_conn *cp,
 static void
 tcp_state_transition(struct ip_vs_conn *cp, int direction,
 		     const struct sk_buff *skb,
-		     struct ip_vs_proto_data *pd)
+		     struct ip_vs_proto_data *pd,
+		     unsigned int iph_len)
 {
 	struct tcphdr _tcph, *th;
 
-#ifdef CONFIG_IP_VS_IPV6
-	int ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr);
-#else
-	int ihl = ip_hdrlen(skb);
-#endif
-
-	th = skb_header_pointer(skb, ihl, sizeof(_tcph), &_tcph);
+	th = skb_header_pointer(skb, iph_len, sizeof(_tcph), &_tcph);
 	if (th == NULL)
 		return;
 
diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c
index f9de632e38cdd6..58f9e255927e2e 100644
--- a/net/netfilter/ipvs/ip_vs_proto_udp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c
@@ -444,7 +444,8 @@ static const char * udp_state_name(int state)
 static void
 udp_state_transition(struct ip_vs_conn *cp, int direction,
 		     const struct sk_buff *skb,
-		     struct ip_vs_proto_data *pd)
+		     struct ip_vs_proto_data *pd,
+		     unsigned int iph_len)
 {
 	if (unlikely(!pd)) {
 		pr_err("UDP no ns data\n");
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
index 99c5b9d671a0ca..2a829b5e8240a7 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -127,12 +127,18 @@ static int flow_offload_fill_route(struct flow_offload *flow,
 
 	switch (route->tuple[dir].xmit_type) {
 	case FLOW_OFFLOAD_XMIT_DIRECT:
+		if (flow_tuple->tun_num) {
+			flow_tuple->dst_cache = dst;
+			flow_tuple->dst_cookie =
+				flow_offload_dst_cookie(flow_tuple);
+		}
 		memcpy(flow_tuple->out.h_dest, route->tuple[dir].out.h_dest,
 		       ETH_ALEN);
 		memcpy(flow_tuple->out.h_source, route->tuple[dir].out.h_source,
 		       ETH_ALEN);
 		flow_tuple->out.ifidx = route->tuple[dir].out.ifindex;
-		dst_release(dst);
+		if (!flow_tuple->tun_num)
+			dst_release(dst);
 		break;
 	case FLOW_OFFLOAD_XMIT_XFRM:
 	case FLOW_OFFLOAD_XMIT_NEIGH:
@@ -152,9 +158,7 @@ static int flow_offload_fill_route(struct flow_offload *flow,
 static void nft_flow_dst_release(struct flow_offload *flow,
 				 enum flow_offload_tuple_dir dir)
 {
-	if (flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH ||
-	    flow->tuplehash[dir].tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM)
-		dst_release(flow->tuplehash[dir].tuple.dst_cache);
+	dst_release(flow->tuplehash[dir].tuple.dst_cache);
 }
 
 void flow_offload_route_init(struct flow_offload *flow,
@@ -345,10 +349,8 @@ int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow)
 
 	nf_ct_refresh(flow->ct, NF_CT_DAY);
 
-	if (nf_flowtable_hw_offload(flow_table)) {
-		__set_bit(NF_FLOW_HW, &flow->flags);
+	if (nf_flowtable_hw_offload(flow_table))
 		nf_flow_offload_add(flow_table, flow);
-	}
 
 	return 0;
 }
@@ -369,7 +371,8 @@ void flow_offload_refresh(struct nf_flowtable *flow_table,
 	    test_bit(NF_FLOW_CLOSING, &flow->flags))
 		return;
 
-	nf_flow_offload_add(flow_table, flow);
+	if (test_bit(NF_FLOW_HW, &flow->flags))
+		nf_flow_offload_refresh(flow_table, flow);
 }
 EXPORT_SYMBOL_GPL(flow_offload_refresh);
 
diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c
index 29e93ac1e2e400..0b78decce8a9bd 100644
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -299,8 +299,7 @@ static bool nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
 
 static inline bool nf_flow_dst_check(struct flow_offload_tuple *tuple)
 {
-	if (tuple->xmit_type != FLOW_OFFLOAD_XMIT_NEIGH &&
-	    tuple->xmit_type != FLOW_OFFLOAD_XMIT_XFRM)
+	if (!tuple->dst_cache)
 		return true;
 
 	return dst_check(tuple->dst_cache, tuple->dst_cookie);
@@ -590,10 +589,10 @@ static int nf_flow_pppoe_push(struct sk_buff *skb, u16 id,
 
 static int nf_flow_tunnel_ipip_push(struct net *net, struct sk_buff *skb,
 				    struct flow_offload_tuple *tuple,
-				    __be32 *ip_daddr)
+				    struct dst_entry *dst, __be32 *ip_daddr)
 {
 	struct iphdr *iph = (struct iphdr *)skb_network_header(skb);
-	struct rtable *rt = dst_rtable(tuple->dst_cache);
+	struct rtable *rt = dst_rtable(dst);
 	u8 tos = iph->tos, ttl = iph->ttl;
 	__be16 frag_off = iph->frag_off;
 	u32 headroom = sizeof(*iph);
@@ -636,21 +635,22 @@ static int nf_flow_tunnel_ipip_push(struct net *net, struct sk_buff *skb,
 
 static int nf_flow_tunnel_v4_push(struct net *net, struct sk_buff *skb,
 				  struct flow_offload_tuple *tuple,
-				  __be32 *ip_daddr)
+				  struct dst_entry *dst,  __be32 *ip_daddr)
 {
 	if (tuple->tun_num)
-		return nf_flow_tunnel_ipip_push(net, skb, tuple, ip_daddr);
+		return nf_flow_tunnel_ipip_push(net, skb, tuple, dst, ip_daddr);
 
 	return 0;
 }
 
 static int nf_flow_tunnel_ip6ip6_push(struct net *net, struct sk_buff *skb,
 				      struct flow_offload_tuple *tuple,
+				      struct dst_entry *dst,
 				      struct in6_addr **ip6_daddr)
 {
 	struct ipv6hdr *ip6h = (struct ipv6hdr *)skb_network_header(skb);
-	struct rtable *rt = dst_rtable(tuple->dst_cache);
 	__u8 dsfield = ipv6_get_dsfield(ip6h);
+	struct rtable *rt = dst_rtable(dst);
 	struct flowi6 fl6 = {
 		.daddr = tuple->tun.src_v6,
 		.saddr = tuple->tun.dst_v6,
@@ -696,10 +696,11 @@ static int nf_flow_tunnel_ip6ip6_push(struct net *net, struct sk_buff *skb,
 
 static int nf_flow_tunnel_v6_push(struct net *net, struct sk_buff *skb,
 				  struct flow_offload_tuple *tuple,
+				  struct dst_entry *dst,
 				  struct in6_addr **ip6_daddr)
 {
 	if (tuple->tun_num)
-		return nf_flow_tunnel_ip6ip6_push(net, skb, tuple, ip6_daddr);
+		return nf_flow_tunnel_ip6ip6_push(net, skb, tuple, dst, ip6_daddr);
 
 	return 0;
 }
@@ -842,7 +843,8 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
 	other_tuple = &flow->tuplehash[!dir].tuple;
 	ip_daddr = other_tuple->src_v4.s_addr;
 
-	if (nf_flow_tunnel_v4_push(state->net, skb, other_tuple, &ip_daddr) < 0)
+	if (nf_flow_tunnel_v4_push(state->net, skb, other_tuple,
+				   tuplehash->tuple.dst_cache, &ip_daddr) < 0)
 		return NF_DROP;
 
 	switch (tuplehash->tuple.xmit_type) {
@@ -1158,6 +1160,7 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
 	ip6_daddr = &other_tuple->src_v6;
 
 	if (nf_flow_tunnel_v6_push(state->net, skb, other_tuple,
+				   tuplehash->tuple.dst_cache,
 				   &ip6_daddr) < 0)
 		return NF_DROP;
 
diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c
index 002ec15d988bdb..801a3dd9ceea3d 100644
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -1101,9 +1101,17 @@ nf_flow_offload_work_alloc(struct nf_flowtable *flowtable,
 	return offload;
 }
 
+static bool nf_flow_offload_unsupported(struct flow_offload *flow)
+{
+	if (flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.tun_num ||
+	    flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.tun_num)
+		return true;
 
-void nf_flow_offload_add(struct nf_flowtable *flowtable,
-			 struct flow_offload *flow)
+	return false;
+}
+
+void nf_flow_offload_refresh(struct nf_flowtable *flowtable,
+			     struct flow_offload *flow)
 {
 	struct flow_offload_work *offload;
 
@@ -1114,6 +1122,16 @@ void nf_flow_offload_add(struct nf_flowtable *flowtable,
 	flow_offload_queue_work(offload);
 }
 
+void nf_flow_offload_add(struct nf_flowtable *flowtable,
+			 struct flow_offload *flow)
+{
+	if (nf_flow_offload_unsupported(flow))
+		return;
+
+	set_bit(NF_FLOW_HW, &flow->flags);
+	nf_flow_offload_refresh(flowtable, flow);
+}
+
 void nf_flow_offload_del(struct nf_flowtable *flowtable,
 			 struct flow_offload *flow)
 {
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index fa36575998616f..5fee61b3813cbc 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -676,7 +676,7 @@ __build_packet_message(struct nfnl_log_net *log,
 			goto nla_put_failure;
 
 		if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
-			BUG();
+			goto nla_put_failure;
 	}
 
 	nlh->nlmsg_len = inst->skb->tail - old_tail;
@@ -698,6 +698,21 @@ static const struct nf_loginfo default_loginfo = {
 	},
 };
 
+static unsigned int nfulnl_get_copy_len(const struct nf_loginfo *li,
+					const struct sk_buff *skb,
+					unsigned int copy_len)
+{
+	unsigned int len = skb->len;
+
+	if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) &&
+	    li->u.ulog.copy_len < copy_len)
+		copy_len = li->u.ulog.copy_len;
+	if (!skb_frags_readable(skb))
+		len = skb_headlen(skb);
+
+	return min(len, copy_len);
+}
+
 /* log handler for internal netfilter logging api */
 static void
 nfulnl_log_packet(struct net *net,
@@ -790,14 +805,7 @@ nfulnl_log_packet(struct net *net,
 		break;
 
 	case NFULNL_COPY_PACKET:
-		data_len = inst->copy_range;
-		if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) &&
-		    (li->u.ulog.copy_len < data_len))
-			data_len = li->u.ulog.copy_len;
-
-		if (data_len > skb->len)
-			data_len = skb->len;
-
+		data_len = nfulnl_get_copy_len(li, skb, inst->copy_range);
 		size += nla_total_size(data_len);
 		break;
 
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 35d4c6c628ffc1..b8aaf39cb4d8ea 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -690,6 +690,17 @@ static int nfqnl_put_master_ifindex(struct sk_buff *nlskb, int attr,
 }
 #endif
 
+static unsigned int nfqnl_get_data_len(const struct sk_buff *entskb,
+				       unsigned int copy_range)
+{
+	unsigned int data_len = entskb->len;
+
+	if (!skb_frags_readable(entskb))
+		data_len = skb_headlen(entskb);
+
+	return min(data_len, copy_range);
+}
+
 static struct sk_buff *
 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
 			   struct nf_queue_entry *entry,
@@ -755,10 +766,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
 		    nf_queue_checksum_help(entskb))
 			return NULL;
 
-		data_len = READ_ONCE(queue->copy_range);
-		if (data_len > entskb->len)
-			data_len = entskb->len;
-
+		data_len = nfqnl_get_data_len(entskb, READ_ONCE(queue->copy_range));
 		hlen = skb_zerocopy_headlen(entskb);
 		hlen = min_t(unsigned int, hlen, data_len);
 		size += sizeof(struct nlattr) + hlen;
diff --git a/net/netfilter/nft_lookup.c b/net/netfilter/nft_lookup.c
index ba512e94b4023f..19887439847d11 100644
--- a/net/netfilter/nft_lookup.c
+++ b/net/netfilter/nft_lookup.c
@@ -103,13 +103,13 @@ void nft_lookup_eval(const struct nft_expr *expr,
 	bool found;
 
 	ext = nft_set_do_lookup(net, set, &regs->data[priv->sreg]);
+	if (!ext)
+		ext = nft_set_catchall_lookup(net, set);
+
 	found = !!ext ^ priv->invert;
 	if (!found) {
-		ext = nft_set_catchall_lookup(net, set);
-		if (!ext) {
-			regs->verdict.code = NFT_BREAK;
-			return;
-		}
+		regs->verdict.code = NFT_BREAK;
+		return;
 	}
 
 	if (ext) {
diff --git a/net/netfilter/xt_u32.c b/net/netfilter/xt_u32.c
index ec1a21e3b6e2c3..dabbaa742874cb 100644
--- a/net/netfilter/xt_u32.c
+++ b/net/netfilter/xt_u32.c
@@ -14,8 +14,8 @@
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/xt_u32.h>
 
-static bool u32_match_it(const struct xt_u32 *data,
-			 const struct sk_buff *skb)
+static int u32_match_it(const struct xt_u32 *data,
+			const struct sk_buff *skb)
 {
 	const struct xt_u32_test *ct;
 	unsigned int testind;
@@ -40,7 +40,8 @@ static bool u32_match_it(const struct xt_u32 *data,
 			return false;
 
 		if (skb_copy_bits(skb, pos, &n, sizeof(n)) < 0)
-			BUG();
+			return -1;
+
 		val   = ntohl(n);
 		nnums = ct->nnums;
 
@@ -68,7 +69,7 @@ static bool u32_match_it(const struct xt_u32 *data,
 
 				if (skb_copy_bits(skb, at + pos, &n,
 						    sizeof(n)) < 0)
-					BUG();
+					return -1;
 				val = ntohl(n);
 				break;
 			}
@@ -90,9 +91,14 @@ static bool u32_match_it(const struct xt_u32 *data,
 static bool u32_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_u32 *data = par->matchinfo;
-	bool ret;
+	int ret;
 
 	ret = u32_match_it(data, skb);
+	if (ret < 0) {
+		par->hotdrop = true;
+		return false;
+	}
+
 	return ret ^ data->invert;
 }

gemini-3.1-pro-preview

							input: 15817
							output: 34
							thoughts: 1776

**Patch Series Analysis for Netfilter/IPVS Components**

Alright, let's dive into this patch series. My initial assessment is that we've got a collection of changes spanning several netfilter and IPVS components. My immediate goal is to understand the functional impact and identify areas that might be interesting for fuzzing.

1. **IPVS Enhancements:** I see that we've got changes to `ip_vs.h` and the protocol-specific files. The key modification is the addition of the `iph_len` argument to the `state_transition` function pointer within the `ip_vs_protocol` struct. This is a solid move, providing the IP header length directly. This propagates through `ip_vs_set_state` and allows the protocol-specific functions to use this value. I notice this is also in `ip_vs_in_icmp`, and the various state transition functions. It appears this fixes potential out-of-bounds reads or length miscalculations by calculating the header length from the skb. The focus for fuzzing will be on `ip_vs_in_icmp`, and the state transition functions, which are the heart of connection tracking and handling. We need to be especially mindful of the tunnel handling. Configs? `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, and `IP_VS_PROTO_SCTP` are all relevant.

2. **Flow Table Offload Refinement:** Next, the flow table offload changes are substantial. The `flow_offload_tuple` struct is modified with fields moved out of a union, and a new `nf_flow_offload_refresh` function appears. The `dst_cookie` and `dst_cache` usage is now more explicit. The key seems to be in the tunnel handling functions like `nf_flow_tunnel_v4_push` and `nf_flow_tunnel_v6_push` - those are good candidates to examine. The logic in `nf_flow_offload_add` regarding `nf_flow_offload_unsupported` and tunnel configurations also warrants close inspection. The `dst_entry *dst` parameter passed to several of the tunnel functions is interesting. The relevant config is `NF_FLOW_TABLE`.

3. **EBtables String Handling Improvement:** Moving on to `ebtables.c`, the changes related to string handling seem aimed at preventing out-of-bounds reads. The addition of checks like `strnlen` in `ebt_check_match` and null-termination in several functions like `update_counters` and `compat_copy_ebt_replace_from_user` are very important, in my opinion, in protecting against potential vulnerabilities. I'll need to pay attention to `ebt_check_match` and those string-handling functions. The relevant config is `BRIDGE_NF_EBTABLES`.

4. **IPv6 Fragmentation Robustness:** `nf_conntrack_reasm.c` gets some attention. Checking `skb_mac_header_was_set(skb)` before incrementing `skb->mac_header` in `nf_ct_frag6_reasm` and handling `skb_copy_bits` failure in `find_prev_fhdr` (returning `-1` instead of `BUG()`) is a good defensive practice. It is likely these changes will allow for less frequent or no panics. The focus will be `nf_ct_frag6_reasm` and `find_prev_fhdr`. The relevant config is `NF_DEFRAG_IPV6`.

5. **IP Set Resizing and Garbage Collection:** The IP set changes seem focused on the internals, adding a spinlock, a resizing flag, and a list head to `htable`. Several functions, including `mtype_gc`, `mtype_resize`, `mtype_add`, and `mtype_del`, are modified. This is about making GC and resizing thread-safe. Those are good targets to scrutinize, especially for potential race conditions or memory leaks. `IP_SET` is the config we're looking at here.

6. **Netlink Logging Reliability:** In `nfnetlink_log.c`, the changes relating to `__build_packet_message` returning an error instead of `BUG()` and the addition of `nfulnl_get_copy_len` for handling `skb_frags_readable` are welcome. They make the code more resilient. Focus is `__build_packet_message` and `nfulnl_log_packet`. Config is `NETFILTER_NETLINK_LOG`.

7. **Netlink Queue Robustness:** `nfnetlink_queue.c` has

{
  "Expression": "config IP_VS",
  "PathPrefix": "net/netfilter/ipvs/Kconfig"
}

{
  "Output": "net/netfilter/ipvs/Kconfig-4-#\nnet/netfilter/ipvs/Kconfig:5:menuconfig IP_VS\nnet/netfilter/ipvs/Kconfig-6-\ttristate \"IP virtual server support\"\n--\nnet/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n"
}

gemini-3.1-pro-preview

							input: 18922
							output: 103
							thoughts: 19

Here's my thought process, summarized as if I were considering these configurations:

**Checking Network Security Configurations**

Okay, time to get this network security audit rolling. First things first, I need to make sure everything's set up the way I expect it to be. Let's start with a deep dive into the `ebtables` configuration. I want to understand how the Ethernet bridge filtering is implemented, looking for any potential vulnerabilities or unexpected behavior there. Then, I'll move on to `ipset`. I'm particularly interested in how they're being utilized for things like blacklisting, whitelisting, or rate-limiting. Are they being used effectively, or could they be optimized? Finally, I need to understand what's happening with `nf_flow_table`. How is the flow offload implemented? Are there any potential issues with that? Are there any limitations on the flow table's size or behavior that I need to be aware of? I'll be looking for configuration details, and checking the performance impacts. I need to be sure everything is working as intended, and that I understand what is going on with all of these tools.

{
  "Expression": "config BRIDGE_NF_EBTABLES",
  "PathPrefix": "net/bridge/netfilter/Kconfig"
}

{
  "Output": "net/bridge/netfilter/Kconfig=28=config NF_CONNTRACK_BRIDGE\n--\nnet/bridge/netfilter/Kconfig-42-# old sockopt interface and eval loop\nnet/bridge/netfilter/Kconfig:43:config BRIDGE_NF_EBTABLES_LEGACY\nnet/bridge/netfilter/Kconfig-44-\ttristate \"Legacy EBTABLES support\"\n--\nnet/bridge/netfilter/Kconfig-52-\nnet/bridge/netfilter/Kconfig:53:menuconfig BRIDGE_NF_EBTABLES\nnet/bridge/netfilter/Kconfig-54-\ttristate \"Ethernet Bridge tables (ebtables) support\"\n"
}

{
  "Expression": "config IP_SET",
  "PathPrefix": "net/netfilter/ipset/Kconfig"
}

{
  "Output": "net/netfilter/ipset/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nnet/netfilter/ipset/Kconfig:2:menuconfig IP_SET\nnet/netfilter/ipset/Kconfig-3-\ttristate \"IP set support\"\n--\nnet/netfilter/ipset/Kconfig=14=if IP_SET\nnet/netfilter/ipset/Kconfig-15-\nnet/netfilter/ipset/Kconfig:16:config IP_SET_MAX\nnet/netfilter/ipset/Kconfig-17-\tint \"Maximum number of IP sets\"\n--\nnet/netfilter/ipset/Kconfig-27-\nnet/netfilter/ipset/Kconfig:28:config IP_SET_BITMAP_IP\nnet/netfilter/ipset/Kconfig-29-\ttristate \"bitmap:ip set support\"\n--\nnet/netfilter/ipset/Kconfig-36-\nnet/netfilter/ipset/Kconfig:37:config IP_SET_BITMAP_IPMAC\nnet/netfilter/ipset/Kconfig-38-\ttristate \"bitmap:ip,mac set support\"\n--\nnet/netfilter/ipset/Kconfig-45-\nnet/netfilter/ipset/Kconfig:46:config IP_SET_BITMAP_PORT\nnet/netfilter/ipset/Kconfig-47-\ttristate \"bitmap:port set support\"\n--\nnet/netfilter/ipset/Kconfig-54-\nnet/netfilter/ipset/Kconfig:55:config IP_SET_HASH_IP\nnet/netfilter/ipset/Kconfig-56-\ttristate \"hash:ip set support\"\n--\nnet/netfilter/ipset/Kconfig-64-\nnet/netfilter/ipset/Kconfig:65:config IP_SET_HASH_IPMARK\nnet/netfilter/ipset/Kconfig-66-\ttristate \"hash:ip,mark set support\"\n--\nnet/netfilter/ipset/Kconfig-73-\nnet/netfilter/ipset/Kconfig:74:config IP_SET_HASH_IPPORT\nnet/netfilter/ipset/Kconfig-75-\ttristate \"hash:ip,port set support\"\n--\nnet/netfilter/ipset/Kconfig-82-\nnet/netfilter/ipset/Kconfig:83:config IP_SET_HASH_IPPORTIP\nnet/netfilter/ipset/Kconfig-84-\ttristate \"hash:ip,port,ip set support\"\n--\nnet/netfilter/ipset/Kconfig-92-\nnet/netfilter/ipset/Kconfig:93:config IP_SET_HASH_IPPORTNET\nnet/netfilter/ipset/Kconfig-94-\ttristate \"hash:ip,port,net set support\"\n--\nnet/netfilter/ipset/Kconfig-102-\nnet/netfilter/ipset/Kconfig:103:config IP_SET_HASH_IPMAC\nnet/netfilter/ipset/Kconfig-104-\ttristate \"hash:ip,mac set support\"\n--\nnet/netfilter/ipset/Kconfig-111-\nnet/netfilter/ipset/Kconfig:112:config IP_SET_HASH_MAC\nnet/netfilter/ipset/Kconfig-113-\ttristate \"hash:mac set support\"\n--\nnet/netfilter/ipset/Kconfig-120-\nnet/netfilter/ipset/Kconfig:121:config IP_SET_HASH_NETPORTNET\nnet/netfilter/ipset/Kconfig-122-\ttristate \"hash:net,port,net set support\"\n--\nnet/netfilter/ipset/Kconfig-129-\nnet/netfilter/ipset/Kconfig:130:config IP_SET_HASH_NET\nnet/netfilter/ipset/Kconfig-131-\ttristate \"hash:net set support\"\n--\nnet/netfilter/ipset/Kconfig-138-\nnet/netfilter/ipset/Kconfig:139:config IP_SET_HASH_NETNET\nnet/netfilter/ipset/Kconfig-140-\ttristate \"hash:net,net set support\"\n--\nnet/netfilter/ipset/Kconfig-147-\nnet/netfilter/ipset/Kconfig:148:config IP_SET_HASH_NETPORT\nnet/netfilter/ipset/Kconfig-149-\ttristate \"hash:net,port set support\"\n--\nnet/netfilter/ipset/Kconfig-157-\nnet/netfilter/ipset/Kconfig:158:config IP_SET_HASH_NETIFACE\nnet/netfilter/ipset/Kconfig-159-\ttristate \"hash:net,iface set support\"\n--\nnet/netfilter/ipset/Kconfig-167-\nnet/netfilter/ipset/Kconfig:168:config IP_SET_LIST_SET\nnet/netfilter/ipset/Kconfig-169-\ttristate \"list:set set support\"\n"
}

{
  "Expression": "config NF_FLOW_TABLE",
  "PathPrefix": "net/netfilter/Kconfig"
}

{
  "Output": "net/netfilter/Kconfig=701=endif # NF_TABLES\nnet/netfilter/Kconfig-702-\nnet/netfilter/Kconfig:703:config NF_FLOW_TABLE_INET\nnet/netfilter/Kconfig-704-\ttristate \"Netfilter flow table mixed IPv4/IPv6 module\"\n--\nnet/netfilter/Kconfig-710-\nnet/netfilter/Kconfig:711:config NF_FLOW_TABLE\nnet/netfilter/Kconfig-712-\ttristate \"Netfilter flow table module\"\n--\nnet/netfilter/Kconfig-720-\nnet/netfilter/Kconfig:721:config NF_FLOW_TABLE_PROCFS\nnet/netfilter/Kconfig-722-\tbool \"Supply flow table statistics in procfs\"\n"
}

gemini-3.1-pro-preview

							input: 20898
							output: 147
							thoughts: 32

Here's my take on those configurations:

**Checking Key Netfilter Configurations**

Alright, let's dive into this. I need to make sure these crucial Netfilter components are set up correctly. First, `nfnetlink_log`. That one's fundamental – it controls the logging of packets that match Netfilter rules. Gotta ensure it's loaded and configured appropriately to actually give me useful information about what's going on within my network traffic. Next, `nfnetlink_queue`. This is even more critical; it allows for user-space queuing, and that's essential for any advanced packet processing, IDS/IPS, or custom filtering logic I might have running. I need to verify its configuration is as expected. Then there's `xt_u32`. This is the user-space extension for the U32 match. I need this to work since I use it extensively. Its reliability is key. Finally, let's not forget `nf_defrag_ipv6`. IPv6 fragmentation is always a concern. I need to confirm the IPv6 defragmentation module is loaded and functioning to deal with potential fragmentation attacks or just to maintain good network performance. It’s all about maintaining a strong and secure network perimeter!

{
  "Expression": "config NETFILTER_NETLINK_LOG",
  "PathPrefix": "net/netfilter/Kconfig"
}

{
  "Output": "net/netfilter/Kconfig=54=config NETFILTER_NETLINK_QUEUE\n--\nnet/netfilter/Kconfig-61-\nnet/netfilter/Kconfig:62:config NETFILTER_NETLINK_LOG\nnet/netfilter/Kconfig-63-\ttristate \"Netfilter LOG over NFNETLINK interface\"\n"
}

{
  "Expression": "config NETFILTER_NETLINK_QUEUE",
  "PathPrefix": "net/netfilter/Kconfig"
}

{
  "Output": "net/netfilter/Kconfig=46=config NETFILTER_NETLINK_ACCT\n--\nnet/netfilter/Kconfig-53-\nnet/netfilter/Kconfig:54:config NETFILTER_NETLINK_QUEUE\nnet/netfilter/Kconfig-55-\ttristate \"Netfilter NFQUEUE over NFNETLINK interface\"\n"
}

{
  "Expression": "config NETFILTER_XT_MATCH_U32",
  "PathPrefix": "net/netfilter/Kconfig"
}

{
  "Output": "net/netfilter/Kconfig=1623=config NETFILTER_XT_MATCH_TIME\n--\nnet/netfilter/Kconfig-1636-\nnet/netfilter/Kconfig:1637:config NETFILTER_XT_MATCH_U32\nnet/netfilter/Kconfig-1638-\ttristate '\"u32\" match support'\n"
}

{
  "Expression": "config NF_DEFRAG_IPV6",
  "PathPrefix": "net/ipv6/netfilter/Kconfig"
}

{
  "Output": "net/ipv6/netfilter/Kconfig=300=endmenu\nnet/ipv6/netfilter/Kconfig-301-\nnet/ipv6/netfilter/Kconfig:302:config NF_DEFRAG_IPV6\nnet/ipv6/netfilter/Kconfig-303-\ttristate\n"
}

gemini-3.1-pro-preview

							input: 21710
							output: 40
							thoughts: 643

**Analyzing Netfilter/IPVS Component Changes**

Okay, so I'm looking at these changes, and immediately, I see they're hitting a bunch of core netfilter and ipvs components. It's a functional shift, impacting quite a few areas. I need to make sure I understand the full implications.

First, I see the configurations that are being affected: `IP_VS`, its TCP, UDP and SCTP protocol support, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, the netlink logging and queueing options and then `NF_TABLES` and the u32 match support. Defragmentation for IPv6 is also in play. Pretty standard suspects for this sort of work.

Next, I'm noting the symbols these changes are probably focusing on. I see symbols from IPVS, state transition routines for TCP, UDP and SCTP; flow offload functions, some ebtables symbols, counter updates, fragmentation reassembly, and then, a collection of macros related to message type operations like garbage collection, resize, add and delete. I recognize the commonality with netlink and nftables operations.

Right, time to drill down. Let's refine the list. I'm going to drop the counter update symbol and focus on the rest.

Hold on... I'm a bit hung up on those message type macros: `mtype_gc`, `mtype_resize`, `mtype_add`, `mtype_del`. Those aren't typical. Are these macros, or perhaps static functions defined in a header? This seems like a detail I need to fully grasp. I'll need to check the ipset headers. Let's look at `net/netfilter/ipset/ip_set_hash_gen.h` to confirm.

Aha! Yes, they are indeed static functions defined in a header, expanded via macros. That clarifies things. I now know the nature of their implementation in the source. I'll now do a quick search in the header file.

{
  "Expression": "mtype_add",
  "PathPrefix": "net/netfilter/ipset/ip_set_hash_gen.h"
}

{
  "Output": "net/netfilter/ipset/ip_set_hash_gen.h=173=static const union nf_inet_addr zeromask = {};\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-204-#undef mtype_ext_cleanup\nnet/netfilter/ipset/ip_set_hash_gen.h:205:#undef mtype_add_cidr\nnet/netfilter/ipset/ip_set_hash_gen.h-206-#undef mtype_del_cidr\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-213-\nnet/netfilter/ipset/ip_set_hash_gen.h:214:#undef mtype_add\nnet/netfilter/ipset/ip_set_hash_gen.h-215-#undef mtype_del\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-249-#define mtype_ext_cleanup\tIPSET_TOKEN(MTYPE, _ext_cleanup)\nnet/netfilter/ipset/ip_set_hash_gen.h:250:#define mtype_add_cidr\t\tIPSET_TOKEN(MTYPE, _add_cidr)\nnet/netfilter/ipset/ip_set_hash_gen.h-251-#define mtype_del_cidr\t\tIPSET_TOKEN(MTYPE, _del_cidr)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-258-\nnet/netfilter/ipset/ip_set_hash_gen.h:259:#define mtype_add\t\tIPSET_TOKEN(MTYPE, _add)\nnet/netfilter/ipset/ip_set_hash_gen.h-260-#define mtype_del\t\tIPSET_TOKEN(MTYPE, _del)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=329=static void\nnet/netfilter/ipset/ip_set_hash_gen.h:330:mtype_add_cidr(struct ip_set *set, struct htype *h, u8 cidr, u8 n)\nnet/netfilter/ipset/ip_set_hash_gen.h-331-{\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=620=static int\nnet/netfilter/ipset/ip_set_hash_gen.h:621:mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,\nnet/netfilter/ipset/ip_set_hash_gen.h-622-\t  struct ip_set_ext *mext, u32 flags);\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=632=mtype_resize(struct ip_set *set, bool retried)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-784-\t\tif (x-\u003ead == IPSET_ADD) {\nnet/netfilter/ipset/ip_set_hash_gen.h:785:\t\t\tmtype_add(set, \u0026x-\u003ed, \u0026x-\u003eext, \u0026x-\u003emext, x-\u003eflags);\nnet/netfilter/ipset/ip_set_hash_gen.h-786-\t\t} else {\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=867=static int\nnet/netfilter/ipset/ip_set_hash_gen.h:868:mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,\nnet/netfilter/ipset/ip_set_hash_gen.h-869-\t  struct ip_set_ext *mext, u32 flags)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-998-\tfor (i = 0; i \u003c IPSET_NET_COUNT; i++)\nnet/netfilter/ipset/ip_set_hash_gen.h:999:\t\tmtype_add_cidr(set, h, NCIDR_PUT(DCIDR_GET(d-\u003ecidr, i)), i);\nnet/netfilter/ipset/ip_set_hash_gen.h-1000-#endif\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=1474=static const struct ip_set_type_variant mtype_variant = {\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-1477-\t.adt\t= {\nnet/netfilter/ipset/ip_set_hash_gen.h:1478:\t\t[IPSET_ADD] = mtype_add,\nnet/netfilter/ipset/ip_set_hash_gen.h-1479-\t\t[IPSET_DEL] = mtype_del,\n"
}

gemini-3.1-pro-preview

							input: 24010
							output: 38
							thoughts: 148

**Analyzing the IPset Code**

Okay, so I'm looking at this macro and it expands to `IPSET_TOKEN(MTYPE, _add)`. That means the resulting function names are going to be defined by the `MTYPE` variable, appended with `_add`. I can assume that there will be analogous functions named based on different operations as well. So, for the IP hash module, I'll be working with functions like `hash_ip4_add`, `hash_ip6_add`, `hash_net4_add`, `hash_net6_add`, the resizing functions, and garbage collection as well, so `hash_ip4_resize`, `hash_ip6_resize`, `hash_ip4_gc`, and `hash_ip6_gc`, which gives me a good idea of the relevant functions I'll need to focus on. To get a handle on how this actually gets implemented, I should probably take a look at `net/netfilter/ipset/ip_set_hash_ip.c` to see how it's actually instantiated.

{
  "Expression": "MTYPE",
  "PathPrefix": "net/netfilter/ipset/ip_set_hash_ip.c"
}

{
  "Output": "net/netfilter/ipset/ip_set_hash_ip.c=70=hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)\n--\nnet/netfilter/ipset/ip_set_hash_ip.c-74-\nnet/netfilter/ipset/ip_set_hash_ip.c:75:#define MTYPE\t\thash_ip4\nnet/netfilter/ipset/ip_set_hash_ip.c-76-#define HOST_MASK\t32\n--\nnet/netfilter/ipset/ip_set_hash_ip.c=202=hash_ip6_data_next(struct hash_ip6_elem *next, const struct hash_ip6_elem *e)\n--\nnet/netfilter/ipset/ip_set_hash_ip.c-205-\nnet/netfilter/ipset/ip_set_hash_ip.c:206:#undef MTYPE\nnet/netfilter/ipset/ip_set_hash_ip.c-207-#undef HOST_MASK\nnet/netfilter/ipset/ip_set_hash_ip.c-208-\nnet/netfilter/ipset/ip_set_hash_ip.c:209:#define MTYPE\t\thash_ip6\nnet/netfilter/ipset/ip_set_hash_ip.c-210-#define HOST_MASK\t128\n"
}

gemini-3.1-pro-preview

							input: 24782
							output: 37
							thoughts: 434

**My Analysis of Relevant Symbols and Configurations**

Okay, let's break this down systematically. I've identified several key symbols that warrant further investigation based on this preliminary pass. Specifically, I'm thinking that `hash_ip4_add`, `hash_ip6_add`, `hash_ip4_resize`, `hash_ip6_resize`, `hash_ip4_gc`, and `hash_ip6_gc` look like prime candidates to delve into, given the context.

For `ebtables`, I'll be focusing on `ebt_check_match`, `update_counters`, and `compat_copy_ebt_replace_from_user` as areas that require close scrutiny.

With regard to `ipvs`, my attention will be on `ip_vs_in_icmp`, `sctp_state_transition`, `tcp_state_transition`, and `udp_state_transition`.

For `nf_flow_table`, I will review `flow_offload_fill_route`, `nf_flow_tunnel_v4_push`, `nf_flow_tunnel_v6_push`, and `nf_flow_offload_add`.

I'll be investigating `nf_conntrack_reasm`, `nf_ct_frag6_reasm`, and `find_prev_fhdr`.

For `nfnetlink_log`, the functions to look at are `__build_packet_message` and `nfulnl_log_packet`.

For `nfnetlink_queue`, the function I will be investigating is `nfqnl_build_packet_message`.

And for `nft_lookup`, my focus will be on `nft_lookup_eval`.

Lastly, I will need to understand the behavior of the `xt_u32` module, with particular attention to the behavior of `u32_match_it` and `u32_mt`.

Now, time to revisit the configurations. I see a familiar set of options: `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32`, and `NF_DEFRAG_IPV6`. Nothing too surprising there.

However, I need to confirm whether `IP_SET_HASH_IP` is essential for enabling the hash types. Yes, it looks like `IP_SET_HASH_IP` would be quite relevant.

{
  "Expression": "config IP_SET_HASH_IP",
  "PathPrefix": "net/netfilter/ipset/Kconfig"
}

{
  "Output": "net/netfilter/ipset/Kconfig=46=config IP_SET_BITMAP_PORT\n--\nnet/netfilter/ipset/Kconfig-54-\nnet/netfilter/ipset/Kconfig:55:config IP_SET_HASH_IP\nnet/netfilter/ipset/Kconfig-56-\ttristate \"hash:ip set support\"\n--\nnet/netfilter/ipset/Kconfig-64-\nnet/netfilter/ipset/Kconfig:65:config IP_SET_HASH_IPMARK\nnet/netfilter/ipset/Kconfig-66-\ttristate \"hash:ip,mark set support\"\n--\nnet/netfilter/ipset/Kconfig-73-\nnet/netfilter/ipset/Kconfig:74:config IP_SET_HASH_IPPORT\nnet/netfilter/ipset/Kconfig-75-\ttristate \"hash:ip,port set support\"\n--\nnet/netfilter/ipset/Kconfig-82-\nnet/netfilter/ipset/Kconfig:83:config IP_SET_HASH_IPPORTIP\nnet/netfilter/ipset/Kconfig-84-\ttristate \"hash:ip,port,ip set support\"\n--\nnet/netfilter/ipset/Kconfig-92-\nnet/netfilter/ipset/Kconfig:93:config IP_SET_HASH_IPPORTNET\nnet/netfilter/ipset/Kconfig-94-\ttristate \"hash:ip,port,net set support\"\n--\nnet/netfilter/ipset/Kconfig-102-\nnet/netfilter/ipset/Kconfig:103:config IP_SET_HASH_IPMAC\nnet/netfilter/ipset/Kconfig-104-\ttristate \"hash:ip,mac set support\"\n"
}

gemini-3.1-pro-preview

							input: 26274
							output: 38
							thoughts: 345

**My Immediate Task: Implementing IP_SET_HASH_IP**

Okay, time to get to it. My initial thought is to integrate `IP_SET_HASH_IP`. Given the configuration parameters I'm working with – `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, and, importantly, `IP_SET_HASH_IP` itself, along with the netfilter and bridge utilities, I need to ensure this is seamlessly integrated. We also have `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32`, and `NF_DEFRAG_IPV6` in the mix, so let's keep those in mind.

Now, my focus needs to be on these specific symbols: `ip_vs_in_icmp`, `sctp_state_transition`, `tcp_state_transition`, `udp_state_transition`, `flow_offload_fill_route`, `nf_flow_tunnel_v4_push`, `nf_flow_tunnel_v6_push`, `nf_flow_offload_add`, `ebt_check_match`, `update_counters`, `compat_copy_ebt_replace_from_user`, `nf_ct_frag6_reasm`, `find_prev_fhdr`, `hash_ip4_gc`, `hash_ip4_resize`, `hash_ip4_add`, `hash_ip4_del`, `__build_packet_message`, `nfulnl_log_packet`, `nfqnl_build_packet_message`, `nft_lookup_eval`, `u32_match_it`, and `u32_mt`. These represent key functions related to connection tracking, flow offload, and table management within the broader netfilter framework, that will influence the behaviour of this new feature.

Hold on a second... `__build_packet_message` is defined as static in `nfnetlink_log.c`. This is something I'll need to double check. That's unusual, and something to be considered as a potential point for interaction or side effects. I'll need to go to `nfnetlink_log.c` and make sure my implementation is compatible. I need to be careful with that.

{
  "Expression": "__build_packet_message",
  "PathPrefix": "net/netfilter/nfnetlink_log.c"
}

{
  "Output": "net/netfilter/nfnetlink_log.c=473=static inline int\nnet/netfilter/nfnetlink_log.c:474:__build_packet_message(struct nfnl_log_net *log,\nnet/netfilter/nfnetlink_log.c-475-\t\t\tstruct nfulnl_instance *inst,\n--\nnet/netfilter/nfnetlink_log.c=718=nfulnl_log_packet(struct net *net,\n--\nnet/netfilter/nfnetlink_log.c-831-\nnet/netfilter/nfnetlink_log.c:832:\t__build_packet_message(log, inst, skb, data_len, pf,\nnet/netfilter/nfnetlink_log.c-833-\t\t\t\thooknum, in, out, prefix, plen,\n"
}

gemini-3.1-pro-preview

							input: 27419
							output: 41
							thoughts: 63

Okay, here's my interpretation of those thoughts, tailored for an expert audience:

**Analyzing the Netfilter Logging Function Call**

Right, so we're dealing with `static inline` here. That strongly suggests the function, whatever it is, might be directly inlined into `nfulnl_log_packet`. Therefore, I'm going to focus my analysis on `nfulnl_log_packet` itself. No need to chase the potential inlined code if I can reason about the wrapper.

Next, I need to understand how the netlink message is built. I'll need to dig into `nfqnl_build_packet_message` now. I'll take a look at `nfnetlink_queue.c` to understand that piece of code. I think I'll be able to quickly gain an understanding of that function, seeing as I know where to find the source.

{
  "Expression": "nfqnl_build_packet_message",
  "PathPrefix": "net/netfilter/nfnetlink_queue.c"
}

{
  "Output": "net/netfilter/nfnetlink_queue.c=704=static struct sk_buff *\nnet/netfilter/nfnetlink_queue.c:705:nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,\nnet/netfilter/nfnetlink_queue.c-706-\t\t\t   struct nf_queue_entry *entry,\n--\nnet/netfilter/nfnetlink_queue.c=974=__nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,\n--\nnet/netfilter/nfnetlink_queue.c-981-\nnet/netfilter/nfnetlink_queue.c:982:\tnskb = nfqnl_build_packet_message(net, queue, entry, \u0026packet_id_ptr);\nnet/netfilter/nfnetlink_queue.c-983-\tif (nskb == NULL) {\n"
}

gemini-3.1-pro-preview

							input: 27956
							output: 42
							thoughts: 29

Okay, here's my interpretation of those thoughts, presented as a first-person expert summary:

**Analyzing a Potential Symbolic Representation**

Right, so this seems like a solid candidate for a good symbolic representation, because it's *static* and not something that's embedded within a larger context. That's a key distinction; static symbols tend to offer a more stable and reliable foundation for formal reasoning. Inline data, on the other hand, can be more subject to change and interpretation, making it less ideal for, say, formal proofs or model-checking. I'm focusing on "good symbol" specifically in the context of formal methods; there are certainly other definitions out there.

Now, let's take a look at the `hash_ip4_gc` function or data structure. This is a very likely place to start, given the context. Knowing the precise nature of the symbol in question is key to validating the conclusion that it is a good symbol.

{
  "Expression": "hash_ip4_gc",
  "PathPrefix": "net/netfilter/ipset/ip_set_hash_ip.c"
}

{
  "error": "no matches"
}

gemini-3.1-pro-preview

							input: 28243
							output: 40
							thoughts: 49

Okay, here's my interpretation of those thoughts, tailored for an expert audience:

**Investigating a Potential Hash Table Implementation**

Right, so `mtype_gc`... that seems to expand to `hash_ip4_gc`. I need to confirm this assumption quickly. Let me go straight to the source. Specifically, I should check the include file `net/netfilter/ipset/ip_set_hash_gen.h`. That's where the definition for `mtype_gc` should reside if my initial guess is correct. I’m thinking there might be something interesting to review in that header.

{
  "Expression": "mtype_gc",
  "PathPrefix": "net/netfilter/ipset/ip_set_hash_gen.h"
}

{
  "Output": "net/netfilter/ipset/ip_set_hash_gen.h=173=static const union nf_inet_addr zeromask = {};\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-223-#undef mtype_list\nnet/netfilter/ipset/ip_set_hash_gen.h:224:#undef mtype_gc_do\nnet/netfilter/ipset/ip_set_hash_gen.h:225:#undef mtype_gc\nnet/netfilter/ipset/ip_set_hash_gen.h:226:#undef mtype_gc_init\nnet/netfilter/ipset/ip_set_hash_gen.h-227-#undef mtype_cancel_gc\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-268-#define mtype_list\t\tIPSET_TOKEN(MTYPE, _list)\nnet/netfilter/ipset/ip_set_hash_gen.h:269:#define mtype_gc_do\t\tIPSET_TOKEN(MTYPE, _gc_do)\nnet/netfilter/ipset/ip_set_hash_gen.h:270:#define mtype_gc\t\tIPSET_TOKEN(MTYPE, _gc)\nnet/netfilter/ipset/ip_set_hash_gen.h:271:#define mtype_gc_init\t\tIPSET_TOKEN(MTYPE, _gc_init)\nnet/netfilter/ipset/ip_set_hash_gen.h-272-#define mtype_cancel_gc\t\tIPSET_TOKEN(MTYPE, _cancel_gc)\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=489=static void\nnet/netfilter/ipset/ip_set_hash_gen.h:490:mtype_gc_do(struct ip_set *set, struct htype *h, struct htable *t, u32 r)\nnet/netfilter/ipset/ip_set_hash_gen.h-491-{\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=563=static void\nnet/netfilter/ipset/ip_set_hash_gen.h:564:mtype_gc(struct work_struct *work)\nnet/netfilter/ipset/ip_set_hash_gen.h-565-{\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-591-\tif (!t-\u003eresizing)\nnet/netfilter/ipset/ip_set_hash_gen.h:592:\t\tmtype_gc_do(set, h, t, r);\nnet/netfilter/ipset/ip_set_hash_gen.h-593-\tspin_unlock_bh(\u0026gc-\u003elock);\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=604=static void\nnet/netfilter/ipset/ip_set_hash_gen.h:605:mtype_gc_init(struct htable_gc *gc)\nnet/netfilter/ipset/ip_set_hash_gen.h-606-{\nnet/netfilter/ipset/ip_set_hash_gen.h:607:\tINIT_DEFERRABLE_WORK(\u0026gc-\u003edwork, mtype_gc);\nnet/netfilter/ipset/ip_set_hash_gen.h-608-\tqueue_delayed_work(system_power_efficient_wq, \u0026gc-\u003edwork, HZ);\n--\nnet/netfilter/ipset/ip_set_hash_gen.h=868=mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext,\n--\nnet/netfilter/ipset/ip_set_hash_gen.h-892-\t\tif (SET_WITH_TIMEOUT(set))\nnet/netfilter/ipset/ip_set_hash_gen.h:893:\t\t\tmtype_gc_do(set, h, t, r);\nnet/netfilter/ipset/ip_set_hash_gen.h-894-\t\tmaxelem = h-\u003emaxelem;\n"
}

gemini-3.1-pro-preview

							input: 29470
							output: 33
							thoughts: 446

**Reviewing Kernel Module Dependencies**

Okay, so I'm looking at `mtype_gc`, which I recall expands to things like `hash_ip4_gc` and `hash_ip6_gc`. Just to be sure, I need to double-check `net/netfilter/ipset/ip_set_hash_ip.c` again. My initial thought is that the functions may not be directly exported, but perhaps they're instantiated. The quickest way to confirm this is to either check the `nm` output, or just focus on those macro names. Alright, `hash_ip4_gc`, `hash_ip4_resize`, `hash_ip4_add`, and `hash_ip4_del` all look promising. I'll need to remember to include their IPv6 counterparts too: `hash_ip6_gc`, `hash_ip6_resize`, `hash_ip6_add`, and `hash_ip6_del`.

Now, let's circle back to the configuration options to make sure all dependencies are covered. I need to make sure I consider: `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, `IP_SET_HASH_IP`, `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32`, and `NF_DEFRAG_IPV6`.

Right, let's verify that `IP_SET_HASH_IP` is sufficient for testing changes related to `ip_set_hash_gen.h`. Yes, since `ip_set_hash_ip.c` includes `ip_set_hash_gen.h`, that confirms it.

Next, I need to confirm that `BRIDGE_NF_EBTABLES` is enough for testing `ebtables.c`. Yep, it looks like it is.

Finally, I need to make sure `NF_FLOW_TABLE` is sufficient to test `nf_flow_table_core.c`, `nf_flow_table_ip.c`, and `nf_flow_table_offload.c`. Yes, it should be, that makes sense.

Just one final question. I should check if `NF_FLOW_TABLE_INET` is actually needed here. It looks like `nf_flow_table_ip.c` should be compiled when `NF_FLOW_TABLE_INET` is enabled, so I think I'm good.

{
  "Expression": "nf_flow_table_ip",
  "PathPrefix": "net/netfilter/Makefile"
}

{
  "Output": "net/netfilter/Makefile=142=obj-$(CONFIG_NF_FLOW_TABLE)\t+= nf_flow_table.o\nnet/netfilter/Makefile:143:nf_flow_table-objs\t\t:= nf_flow_table_core.o nf_flow_table_ip.o \\\nnet/netfilter/Makefile-144-\t\t\t\t   nf_flow_table_path.o \\\n"
}

gemini-3.1-pro-preview

							input: 30630
							output: 34
							thoughts: 51

Okay, here's my take on those thoughts, tailored for an expert audience:

**NF_FLOW_TABLE Deduction and Code Dive**

Right, so I'm dealing with `nf_flow_table_ip.o` and my immediate thought is that this clearly falls under the umbrella of `nf_flow_table`. The relationship is apparent, which means just referencing `NF_FLOW_TABLE` in the current context should cover what I need. No need for anything more granular at this point.

Now, let's drill down and see how this all connects. The next logical step is to dive into the `nf_flow_table_offload.c` source. I want to see how the offloading mechanisms are implemented in detail, to assess how all the components interact. This code is the key to understanding the interplay between the IP-specific and more general flow table functionality.

{
  "Expression": "nf_flow_table_offload",
  "PathPrefix": "net/netfilter/Makefile"
}

{
  "Output": "net/netfilter/Makefile=143=nf_flow_table-objs\t\t:= nf_flow_table_core.o nf_flow_table_ip.o \\\nnet/netfilter/Makefile-144-\t\t\t\t   nf_flow_table_path.o \\\nnet/netfilter/Makefile:145:\t\t\t\t   nf_flow_table_offload.o nf_flow_table_xdp.o\nnet/netfilter/Makefile-146-nf_flow_table-$(CONFIG_NF_FLOW_TABLE_PROCFS) += nf_flow_table_procfs.o\n"
}

gemini-3.1-pro-preview

							input: 31054
							output: 31
							thoughts: 28

Okay, here's my take on those thoughts, framed as an expert's internal monologue:

**Diving into the Flow Table**

Right, so we're dealing with something related to the `nf_flow_table`, specifically within the Netfilter framework. The context screams that, so let's start there. My gut says this has some interplay with the logging capabilities. That means the next logical point of investigation is `nfnetlink_log.c`. That file is the most likely candidate. Let's see what's what.

{
  "Expression": "nfnetlink_log",
  "PathPrefix": "net/netfilter/Makefile"
}

{
  "Output": "net/netfilter/Makefile=28=obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o\nnet/netfilter/Makefile:29:obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o\nnet/netfilter/Makefile-30-obj-$(CONFIG_NETFILTER_NETLINK_OSF) += nfnetlink_osf.o\n"
}

gemini-3.1-pro-preview

							input: 31339
							output: 31
							thoughts: 28

Okay, here's my take on those thoughts, tailored for an expert audience:

**Kernel-Level Logging with nfnetlink_queue**

Alright, yep, `NETFILTER_NETLINK_LOG` should absolutely be sufficient for the task at hand. No need to overcomplicate things; this seems like the direct route. Now, let's just make sure, let's double-check the implementation details and refresh my memory on the interactions. I'll need to dive into `nfnetlink_queue.c` to confirm my understanding of the internals.

{
  "Expression": "nfnetlink_queue",
  "PathPrefix": "net/netfilter/Makefile"
}

{
  "Output": "net/netfilter/Makefile=27=obj-$(CONFIG_NETFILTER_NETLINK_ACCT) += nfnetlink_acct.o\nnet/netfilter/Makefile:28:obj-$(CONFIG_NETFILTER_NETLINK_QUEUE) += nfnetlink_queue.o\nnet/netfilter/Makefile-29-obj-$(CONFIG_NETFILTER_NETLINK_LOG) += nfnetlink_log.o\n"
}

gemini-3.1-pro-preview

							input: 31627
							output: 29
							thoughts: 26

Okay, here's my take on those thoughts, framed as an expert's internal monologue:

**Confirmation and Initial Approach**

Alright, yep, confirming that `NETFILTER_NETLINK_QUEUE` is the right avenue here. We're looking at the core of the problem, and this appears to be the appropriate netlink queue. Good, good. Now, let's dive into the guts of this implementation. Where's the heart of the matter? Time to crack open `nft_lookup.c` and see how it all hangs together. This is where the magic (or the problems) likely resides. Let's see how they're handling the interaction with the queue and the specific lookup process.

{
  "Expression": "nft_lookup",
  "PathPrefix": "net/netfilter/Makefile"
}

{
  "Output": "net/netfilter/Makefile=87=nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \\\nnet/netfilter/Makefile-88-\t\t  nf_tables_trace.o nft_immediate.o nft_cmp.o nft_range.o \\\nnet/netfilter/Makefile:89:\t\t  nft_bitwise.o nft_byteorder.o nft_payload.o nft_lookup.o \\\nnet/netfilter/Makefile-90-\t\t  nft_dynset.o nft_meta.o nft_rt.o nft_exthdr.o nft_last.o \\\n"
}

gemini-3.1-pro-preview

							input: 31996
							output: 31
							thoughts: 25

Okay, here's my take on those thoughts, framed as an expert's internal monologue:

**Quick NF_TABLES Assessment**

Right, `NF_TABLES`. That's the key. Yes, based on the context, I think it's sufficient for what we need to accomplish. No need to go deeper into other kernel subsystems for this particular problem.

Now, let's take a quick look at `xt_u32.c`. I need to refresh my memory on the specifics of that module and how it interacts with the rest of the Netfilter framework to confirm my understanding and make sure there are no obvious gotchas I'm missing. Time to dive into the code...

{
  "Expression": "xt_u32",
  "PathPrefix": "net/netfilter/Makefile"
}

{
  "Output": "net/netfilter/Makefile=232=obj-$(CONFIG_NETFILTER_XT_MATCH_TIME) += xt_time.o\nnet/netfilter/Makefile:233:obj-$(CONFIG_NETFILTER_XT_MATCH_U32) += xt_u32.o\nnet/netfilter/Makefile-234-\n"
}

gemini-3.1-pro-preview

							input: 32292
							output: 37
							thoughts: 34

Okay, here's my take on those thoughts, tailored for an expert audience:

**Kernel Module Design Validation**

Alright, so the initial thought was pretty clear: confirming that `NETFILTER_XT_MATCH_U32` offers sufficient capability for the current module's needs. We're satisfied with that piece, which makes sense. 

Now, the next logical step, and what I'm already mentally reaching for, is to immediately dive into `nf_conntrack_reasm.c`. My concern, as always when working with connection tracking, is potential interactions and side effects. I want to thoroughly examine that module for any existing reassembly logic and, specifically, how it handles fragmented packets. We need to be absolutely sure our implementation plays nicely with the existing connection tracking infrastructure, and doesn't introduce any unforeseen issues or conflicts with the reassembly process. Gotta make sure we're not stepping on any toes there. This is a critical point for ensuring the stability and performance of the module.

{
  "Expression": "nf_conntrack_reasm",
  "PathPrefix": "net/ipv6/netfilter/Makefile"
}

{
  "Output": "net/ipv6/netfilter/Makefile=12=obj-$(CONFIG_IP6_NF_NAT) += ip6table_nat.o\n--\nnet/ipv6/netfilter/Makefile-14-# defrag\nnet/ipv6/netfilter/Makefile:15:nf_defrag_ipv6-y := nf_defrag_ipv6_hooks.o nf_conntrack_reasm.o\nnet/ipv6/netfilter/Makefile-16-obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o\n"
}

gemini-3.1-pro-preview

							input: 32721
							output: 34
							thoughts: 32

Okay, here's my take on those thoughts, framed as an expert's internal monologue:

**IPv6 Fragmentation Consideration**

Alright, based on what I've been mulling over, it's pretty clear that `NF_DEFRAG_IPV6` is, in fact, the appropriate Netfilter hook for what I'm dealing with. That's a solid starting point. Now, to be absolutely certain and ensure I haven't missed any edge cases or implications, I need to dig into the relevant kernel code. Specifically, I'll start with `ip_vs_core.c` and any other modules or files that handle IPv6 and connection tracking. I need to understand how the fragmentation process interacts with those components. My goal is to confirm how the hook is being utilized and if any other related logic needs to be accounted for.

{
  "Expression": "ip_vs_core",
  "PathPrefix": "net/netfilter/ipvs/Makefile"
}

{
  "Output": "net/netfilter/ipvs/Makefile=14=ip_vs-extra_objs-$(CONFIG_IP_VS_NFCT) += ip_vs_nfct.o\nnet/netfilter/ipvs/Makefile-15-\nnet/netfilter/ipvs/Makefile:16:ip_vs-objs :=\tip_vs_conn.o ip_vs_core.o ip_vs_ctl.o ip_vs_sched.o\t   \\\nnet/netfilter/ipvs/Makefile-17-\t\tip_vs_xmit.o ip_vs_app.o ip_vs_sync.o\t   \t\t   \\\n"
}

gemini-3.1-pro-preview

							input: 33127
							output: 38
							thoughts: 31

Okay, here's my take on those thoughts, tailored for an expert audience:

**Examining the IPVS Landscape**

Right, `IP_VS` will do the trick. That’s the initial assessment, and it feels right given the context. Now, to be absolutely certain and to solidify the architecture, I'll need to dig into the implementation details. Let's start with a focused look at `ip_vs_proto_sctp.c` – that's the crucial SCTP protocol support file – and then broaden the inspection to any other relevant modules. Gotta verify that we have complete coverage and understand any potential nuances. I want to ensure this implementation adheres to performance expectations, and that no edge cases will rear their heads.

{
  "Expression": "ip_vs_proto_sctp",
  "PathPrefix": "net/netfilter/ipvs/Makefile"
}

{
  "Output": "net/netfilter/ipvs/Makefile=10=ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_AH_ESP) += ip_vs_proto_ah_esp.o\nnet/netfilter/ipvs/Makefile:11:ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_SCTP) += ip_vs_proto_sctp.o\nnet/netfilter/ipvs/Makefile-12-\n"
}

gemini-3.1-pro-preview

							input: 33473
							output: 34
							thoughts: 389

**My Analysis of Kernel Configuration and Focus Symbols**

Okay, I've got this. Looks like `IP_VS_PROTO_SCTP`, `IP_VS_PROTO_TCP`, and `IP_VS_PROTO_UDP` are sufficient for the core protocol handling. This confirms my initial assessment.

So the relevant configuration options are:

*   IP_VS
*   IP_VS_PROTO_TCP
*   IP_VS_PROTO_UDP
*   IP_VS_PROTO_SCTP
*   NF_FLOW_TABLE
*   BRIDGE_NF_EBTABLES
*   IP_SET
*   IP_SET_HASH_IP
*   NETFILTER_NETLINK_LOG
*   NETFILTER_NETLINK_QUEUE
*   NF_TABLES
*   NETFILTER_XT_MATCH_U32
*   NF_DEFRAG_IPV6

My focus now shifts to the functions themselves. The list of symbols I'm keying on include the following:

*   `ip_vs_in_icmp`
*   `sctp_state_transition`
*   `tcp_state_transition`
*   `udp_state_transition`
*   `flow_offload_fill_route`
*   `nf_flow_tunnel_v4_push`
*   `nf_flow_tunnel_v6_push`
*   `nf_flow_offload_add`
*   `ebt_check_match`
*   `update_counters`
*   `compat_copy_ebt_replace_from_user`
*   `nf_ct_frag6_reasm`
*   `find_prev_fhdr`
*   `hash_ip4_gc`
*   `hash_ip4_resize`
*   `hash_ip4_add`
*   `hash_ip4_del`
*   `hash_ip6_gc`
*   `hash_ip6_resize`
*   `hash_ip6_add`
*   `hash_ip6_del`
*   `nfulnl_log_packet`
*   `nfqnl_build_packet_message`
*   `nft_lookup_eval`
*   `u32_match_it`
*   `u32_mt`

Wait a minute, I should double-check that `update_counters` and `compat_copy_ebt_replace_from_user` are static in `ebtables.c`. I don't want to make any assumptions there, and it's always good practice to verify these things.

{
  "Expression": "update_counters",
  "PathPrefix": "net/bridge/netfilter/ebtables.c"
}

{
  "Output": "net/bridge/netfilter/ebtables.c=1362=void ebt_unregister_table(struct net *net, const char *name)\n--\nnet/bridge/netfilter/ebtables.c-1383-/* userspace just supplied us with counters */\nnet/bridge/netfilter/ebtables.c:1384:static int do_update_counters(struct net *net, const char *name,\nnet/bridge/netfilter/ebtables.c-1385-\t\t\t      struct ebt_counter __user *counters,\n--\nnet/bridge/netfilter/ebtables.c-1429-\nnet/bridge/netfilter/ebtables.c:1430:static int update_counters(struct net *net, sockptr_t arg, unsigned int len)\nnet/bridge/netfilter/ebtables.c-1431-{\n--\nnet/bridge/netfilter/ebtables.c-1443-\nnet/bridge/netfilter/ebtables.c:1444:\treturn do_update_counters(net, hlp.name, hlp.counters,\nnet/bridge/netfilter/ebtables.c-1445-\t\t\t\t  hlp.num_counters, len);\n--\nnet/bridge/netfilter/ebtables.c=2292=static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)\n--\nnet/bridge/netfilter/ebtables.c-2393-\nnet/bridge/netfilter/ebtables.c:2394:static int compat_update_counters(struct net *net, sockptr_t arg,\nnet/bridge/netfilter/ebtables.c-2395-\t\t\t\t  unsigned int len)\n--\nnet/bridge/netfilter/ebtables.c-2407-\tif (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))\nnet/bridge/netfilter/ebtables.c:2408:\t\treturn update_counters(net, arg, len);\nnet/bridge/netfilter/ebtables.c-2409-\nnet/bridge/netfilter/ebtables.c:2410:\treturn do_update_counters(net, hlp.name, compat_ptr(hlp.counters),\nnet/bridge/netfilter/ebtables.c-2411-\t\t\t\t  hlp.num_counters, len);\n--\nnet/bridge/netfilter/ebtables.c=2555=static int do_ebt_set_ctl(struct sock *sk, int cmd, sockptr_t arg,\n--\nnet/bridge/netfilter/ebtables.c-2577-\t\tif (in_compat_syscall())\nnet/bridge/netfilter/ebtables.c:2578:\t\t\tret = compat_update_counters(net, arg, len);\nnet/bridge/netfilter/ebtables.c-2579-\t\telse\nnet/bridge/netfilter/ebtables.c-2580-#endif\nnet/bridge/netfilter/ebtables.c:2581:\t\t\tret = update_counters(net, arg, len);\nnet/bridge/netfilter/ebtables.c-2582-\t\tbreak;\n"
}

gemini-3.1-pro-preview

							input: 35281
							output: 43
							thoughts: 26

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Static Function Verification**

Okay, so the initial assessment is correct; those are indeed static functions. The next step is to drill down into the specifics. I need to verify the `compat_copy_ebt_replace_from_user` function. That's where the critical functionality lies, and I need to understand its behavior thoroughly before proceeding. We can't afford any assumptions here. The potential for vulnerabilities in user-space copy functions necessitates meticulous examination, particularly when dealing with the ebtables context. Time to pull up the code and get to it.

{
  "Expression": "compat_copy_ebt_replace_from_user",
  "PathPrefix": "net/bridge/netfilter/ebtables.c"
}

{
  "Output": "net/bridge/netfilter/ebtables.c=2236=static int compat_copy_entries(unsigned char *data, unsigned int size_user,\n--\nnet/bridge/netfilter/ebtables.c-2253-\nnet/bridge/netfilter/ebtables.c:2254:static int compat_copy_ebt_replace_from_user(struct ebt_replace *repl,\nnet/bridge/netfilter/ebtables.c-2255-\t\t\t\t\t     sockptr_t arg, unsigned int len)\n--\nnet/bridge/netfilter/ebtables.c=2292=static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)\n--\nnet/bridge/netfilter/ebtables.c-2299-\nnet/bridge/netfilter/ebtables.c:2300:\tret = compat_copy_ebt_replace_from_user(\u0026tmp, arg, len);\nnet/bridge/netfilter/ebtables.c-2301-\tif (ret) {\n"
}

gemini-3.1-pro-preview

							input: 35753
							output: 44
							thoughts: 19

Okay, here's my summarized thought process, presented as if I were having these thoughts:

**Analyzing the Situation**

Alright, the core concept here appears to be static. Yes, that's what I'm concluding.

Now, let's confirm the behavior of this crucial `find_prev_fhdr` function. Its behavior needs to be correct, and that needs to be the next step.

{
  "Expression": "find_prev_fhdr",
  "PathPrefix": "net/ipv6/netfilter/nf_conntrack_reasm.c"
}

{
  "Output": "net/ipv6/netfilter/nf_conntrack_reasm.c=396=static int\nnet/ipv6/netfilter/nf_conntrack_reasm.c:397:find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff)\nnet/ipv6/netfilter/nf_conntrack_reasm.c-398-{\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c=446=int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user)\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-462-\nnet/ipv6/netfilter/nf_conntrack_reasm.c:463:\tif (find_prev_fhdr(skb, \u0026prevhdr, \u0026nhoff, \u0026fhoff) \u003c 0)\nnet/ipv6/netfilter/nf_conntrack_reasm.c-464-\t\treturn 0;\n"
}

gemini-3.1-pro-preview

							input: 36183
							output: 44
							thoughts: 36

Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person:

**Assessment of Tunnel Push Functions**

Right, the observation is that the state is static, which is the crux of the matter. My immediate instinct is to delve into the core of the packet-pushing mechanisms, specifically within the Netfilter framework. I need to understand *why* this static state is being observed. The two functions I'm focusing on, then, are `nf_flow_tunnel_v4_push` and `nf_flow_tunnel_v6_push`. These are the obvious entry points to investigate the data flow for IPv4 and IPv6 tunnels. My primary concern at this point revolves around how the tunnel encapsulation/decapsulation is managed in the context of Netfilter's flow tracking, and whether there are any potential locking or state management issues within those functions. The next logical step would be to trace the execution path from the point the packets hit these functions and see how the tunnel-specific data is processed, and whether anything sticks around that shouldn't.

{
  "Expression": "nf_flow_tunnel_v4_push",
  "PathPrefix": "net/netfilter/nf_flow_table_ip.c"
}

{
  "Output": "net/netfilter/nf_flow_table_ip.c=590=static int nf_flow_tunnel_ipip_push(struct net *net, struct sk_buff *skb,\n--\nnet/netfilter/nf_flow_table_ip.c-635-\nnet/netfilter/nf_flow_table_ip.c:636:static int nf_flow_tunnel_v4_push(struct net *net, struct sk_buff *skb,\nnet/netfilter/nf_flow_table_ip.c-637-\t\t\t\t  struct flow_offload_tuple *tuple,\n--\nnet/netfilter/nf_flow_table_ip.c=806=nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,\n--\nnet/netfilter/nf_flow_table_ip.c-845-\nnet/netfilter/nf_flow_table_ip.c:846:\tif (nf_flow_tunnel_v4_push(state-\u003enet, skb, other_tuple,\nnet/netfilter/nf_flow_table_ip.c-847-\t\t\t\t   tuplehash-\u003etuple.dst_cache, \u0026ip_daddr) \u003c 0)\n"
}

gemini-3.1-pro-preview

							input: 36804
							output: 42
							thoughts: 21

Here's my take on those thoughts, tailored for an expert audience:

**Examining Static Configurations and Flow Offload Route Filling**

Okay, so the initial assessment is that the configurations are, indeed, static. No surprises there. My primary concern at this point is verifying the correct population of the route table in relation to the flow offload mechanism. I need to make sure that the system is behaving as expected with regard to how routes are being filled, especially in the context of offloading. The next logical step is to dive into `flow_offload_fill_route` to confirm the route population strategy. I need to understand if the routes are being added with the proper attributes and next hops. Does it handle different offload scenarios, different types of routes (static vs. dynamic), and any potential corner cases efficiently? I'm hoping to quickly identify any potential gaps or inefficiencies in route propagation related to the flow offload functionality.

{
  "Expression": "flow_offload_fill_route",
  "PathPrefix": "net/netfilter/nf_flow_table_core.c"
}

{
  "Output": "net/netfilter/nf_flow_table_core.c=87=static struct dst_entry *nft_route_dst_fetch(struct nf_flow_route *route,\n--\nnet/netfilter/nf_flow_table_core.c-96-\nnet/netfilter/nf_flow_table_core.c:97:static int flow_offload_fill_route(struct flow_offload *flow,\nnet/netfilter/nf_flow_table_core.c-98-\t\t\t\t   struct nf_flow_route *route,\n--\nnet/netfilter/nf_flow_table_core.c=164=void flow_offload_route_init(struct flow_offload *flow,\n--\nnet/netfilter/nf_flow_table_core.c-166-{\nnet/netfilter/nf_flow_table_core.c:167:\tflow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_ORIGINAL);\nnet/netfilter/nf_flow_table_core.c:168:\tflow_offload_fill_route(flow, route, FLOW_OFFLOAD_DIR_REPLY);\nnet/netfilter/nf_flow_table_core.c-169-\tflow-\u003etype = NF_FLOW_OFFLOAD_ROUTE;\n"
}

gemini-3.1-pro-preview

							input: 37388
							output: 37
							thoughts: 19

Okay, here's my interpretation of those thoughts, tailored for an expert audience, and delivered as a first-person summary:

**Static Analysis Checkpoint**

Right, so I'm assessing this situation and the initial read indicates that the state is indeed static. No real surprises there, but that’s the starting point. My next move is to drill down and verify this assumption rigorously. I need to confirm this with hard data, so I'm immediately shifting focus to `ebt_check_match`. That’s where the meat of this analysis lies – that's the function I want to inspect to validate this "static" assessment. I need to see *why* we're seeing this, what the specific conditions are, and confirm that there's no dynamic state hidden beneath the surface. I need to ensure this isn't a false positive or an assumption that might be leading me down a wrong path. `ebt_check_match` is the key to either confirming or invalidating my initial impression of the system's state.

{
  "Expression": "ebt_check_match",
  "PathPrefix": "net/bridge/netfilter/ebtables.c"
}

{
  "Output": "net/bridge/netfilter/ebtables.c=393=static inline int\nnet/bridge/netfilter/ebtables.c:394:ebt_check_match(struct ebt_entry_match *m, struct xt_mtchk_param *par,\nnet/bridge/netfilter/ebtables.c-395-\t\tunsigned int *cnt)\n--\nnet/bridge/netfilter/ebtables.c=685=ebt_check_entry(struct ebt_entry *e, struct net *net,\n--\nnet/bridge/netfilter/ebtables.c-742-\tmtpar.family    = tgpar.family    = NFPROTO_BRIDGE;\nnet/bridge/netfilter/ebtables.c:743:\tret = EBT_MATCH_ITERATE(e, ebt_check_match, \u0026mtpar, \u0026i);\nnet/bridge/netfilter/ebtables.c-744-\tif (ret != 0)\n"
}

gemini-3.1-pro-preview

							input: 37907
							output: 35
							thoughts: 67

**Analyzing the `ebt_check_entry` Function**

Okay, so the code utilizes `static inline`, which confirms my initial assessment. It looks like `ebt_check_entry` is called through `EBT_MATCH_ITERATE`. Given the potential complexities and dependencies, I'm going to lean towards using `ebt_check_entry` directly instead of `ebt_check_match` – better to be safe than sorry, and this approach feels more robust. Now, just to be thorough and to understand the broader implications, I need to check out what's happening within `nft_lookup_eval` as well. Let's see how that ties in.

{
  "Expression": "nft_lookup_eval",
  "PathPrefix": "net/netfilter/nft_lookup.c"
}

{
  "Output": "net/netfilter/nft_lookup.c=93=EXPORT_SYMBOL_GPL(nft_set_do_lookup);\nnet/netfilter/nft_lookup.c-94-\nnet/netfilter/nft_lookup.c:95:void nft_lookup_eval(const struct nft_expr *expr,\nnet/netfilter/nft_lookup.c-96-\t\t     struct nft_regs *regs,\n--\nnet/netfilter/nft_lookup.c=269=static const struct nft_expr_ops nft_lookup_ops = {\n--\nnet/netfilter/nft_lookup.c-271-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_lookup)),\nnet/netfilter/nft_lookup.c:272:\t.eval\t\t= nft_lookup_eval,\nnet/netfilter/nft_lookup.c-273-\t.init\t\t= nft_lookup_init,\n"
}

gemini-3.1-pro-preview

							input: 38389
							output: 39
							thoughts: 34

Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person:

**Quick Scan: Export Status and Target Functions**

Right, so the first thing I'm gathering here is that we're dealing with something that's *not* statically defined within a module. The reference to "exported" or "non-static" strongly suggests that it is externally visible and likely intended for interaction with other modules or even outside the current compilation unit.

Now, the natural next step is to nail down exactly *what* we are looking at. I need to understand its functionality and integration.  I'm thinking, let's take a look at `u32_match_it` and `u32_mt`. Those two function names suggest something dealing with 32-bit unsigned integers, perhaps matching or manipulation respectively. Given the context, these seem to be the prime candidates to investigate further. I'll need to dig into their definitions to understand the full implications of the external scope implied earlier.

{
  "Expression": "u32_match_it",
  "PathPrefix": "net/netfilter/xt_u32.c"
}

{
  "Output": "net/netfilter/xt_u32.c-16-\nnet/netfilter/xt_u32.c:17:static int u32_match_it(const struct xt_u32 *data,\nnet/netfilter/xt_u32.c-18-\t\t\tconst struct sk_buff *skb)\n--\nnet/netfilter/xt_u32.c=91=static bool u32_mt(const struct sk_buff *skb, struct xt_action_param *par)\n--\nnet/netfilter/xt_u32.c-95-\nnet/netfilter/xt_u32.c:96:\tret = u32_match_it(data, skb);\nnet/netfilter/xt_u32.c-97-\tif (ret \u003c 0) {\n"
}

gemini-3.1-pro-preview

							input: 38897
							output: 47
							thoughts: 51

Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person:

**Reaching for the Right Tool for the Job**

Alright, so the code structure is pretty straightforward here. I've noted that `u32_match_it` is declared as static, as is `u32_mt`. No real surprises there. Given the context, I'm leaning toward employing `u32_mt`. It seems the more appropriate choice, given its static nature in this scenario.

Now, let's pivot to examine `nf_ct_frag6_reasm`. I need to understand its relationship to these other components to ensure seamless integration and avoid any potential conflicts within this module. I'm thinking I need to understand how those interfaces interact. Time to dive into the details.

{
  "Expression": "nf_ct_frag6_reasm",
  "PathPrefix": "net/ipv6/netfilter/nf_conntrack_reasm.c"
}

{
  "Output": "net/ipv6/netfilter/nf_conntrack_reasm.c=120=static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net)\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-124-\nnet/ipv6/netfilter/nf_conntrack_reasm.c:125:static int nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *skb,\nnet/ipv6/netfilter/nf_conntrack_reasm.c-126-\t\t\t     struct sk_buff *prev_tail, struct net_device *dev,\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c=170=static int nf_ct_frag6_queue(struct frag_queue *fq, struct sk_buff *skb,\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-291-\t\tskb-\u003e_skb_refdst = 0UL;\nnet/ipv6/netfilter/nf_conntrack_reasm.c:292:\t\terr = nf_ct_frag6_reasm(fq, skb, prev, dev, refs);\nnet/ipv6/netfilter/nf_conntrack_reasm.c-293-\t\tskb-\u003e_skb_refdst = orefdst;\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-318- */\nnet/ipv6/netfilter/nf_conntrack_reasm.c:319:static int nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *skb,\nnet/ipv6/netfilter/nf_conntrack_reasm.c-320-\t\t\t     struct sk_buff *prev_tail, struct net_device *dev,\n--\nnet/ipv6/netfilter/nf_conntrack_reasm.c-340-\tif (payload_len \u003e IPV6_MAXPLEN) {\nnet/ipv6/netfilter/nf_conntrack_reasm.c:341:\t\tnet_dbg_ratelimited(\"nf_ct_frag6_reasm: payload len = %d\\n\",\nnet/ipv6/netfilter/nf_conntrack_reasm.c-342-\t\t\t\t    payload_len);\n"
}

gemini-3.1-pro-preview

							input: 39771
							output: 43
							thoughts: 60

Okay, here's my interpretation of those thoughts, tailored for an expert audience, as if they were my own:

**Static Flow Table Considerations**

Right, it's clear the system is static. Given that constraint, I'm leaning toward either `nf_ct_frag6_queue` or `nf_ct_frag6_gather`. I think `nf_ct_frag6_gather` is the better choice for this particular scenario; it seems more efficient in the long run.

Now, let me just quickly check the `nf_flow_offload_add` function to ensure that it's compatible with that approach. I need to make sure the flow offload addition logic will integrate seamlessly with the fragmentation handling I'm implementing. Gotta consider the bigger picture here.

{
  "Expression": "nf_flow_offload_add",
  "PathPrefix": "net/netfilter/nf_flow_table_offload.c"
}

{
  "Output": "net/netfilter/nf_flow_table_offload.c-19-\nnet/netfilter/nf_flow_table_offload.c:20:static struct workqueue_struct *nf_flow_offload_add_wq;\nnet/netfilter/nf_flow_table_offload.c-21-static struct workqueue_struct *nf_flow_offload_del_wq;\n--\nnet/netfilter/nf_flow_table_offload.c=1065=static void flow_offload_queue_work(struct flow_offload_work *offload)\n--\nnet/netfilter/nf_flow_table_offload.c-1070-\t\tNF_FLOW_TABLE_STAT_INC_ATOMIC(net, count_wq_add);\nnet/netfilter/nf_flow_table_offload.c:1071:\t\tqueue_work(nf_flow_offload_add_wq, \u0026offload-\u003ework);\nnet/netfilter/nf_flow_table_offload.c-1072-\t} else if (offload-\u003ecmd == FLOW_CLS_DESTROY) {\n--\nnet/netfilter/nf_flow_table_offload.c=1113=void nf_flow_offload_refresh(struct nf_flowtable *flowtable,\n--\nnet/netfilter/nf_flow_table_offload.c-1124-\nnet/netfilter/nf_flow_table_offload.c:1125:void nf_flow_offload_add(struct nf_flowtable *flowtable,\nnet/netfilter/nf_flow_table_offload.c-1126-\t\t\t struct flow_offload *flow)\n--\nnet/netfilter/nf_flow_table_offload.c=1173=void nf_flow_table_offload_flush(struct nf_flowtable *flowtable)\n--\nnet/netfilter/nf_flow_table_offload.c-1175-\tif (nf_flowtable_hw_offload(flowtable)) {\nnet/netfilter/nf_flow_table_offload.c:1176:\t\tflush_workqueue(nf_flow_offload_add_wq);\nnet/netfilter/nf_flow_table_offload.c-1177-\t\tflush_workqueue(nf_flow_offload_del_wq);\n--\nnet/netfilter/nf_flow_table_offload.c=1294=int nf_flow_table_offload_init(void)\nnet/netfilter/nf_flow_table_offload.c-1295-{\nnet/netfilter/nf_flow_table_offload.c:1296:\tnf_flow_offload_add_wq  = alloc_workqueue(\"nf_ft_offload_add\",\nnet/netfilter/nf_flow_table_offload.c-1297-\t\t\t\t\t\t  WQ_UNBOUND | WQ_SYSFS, 0);\nnet/netfilter/nf_flow_table_offload.c:1298:\tif (!nf_flow_offload_add_wq)\nnet/netfilter/nf_flow_table_offload.c-1299-\t\treturn -ENOMEM;\n--\nnet/netfilter/nf_flow_table_offload.c-1315-err_del_wq:\nnet/netfilter/nf_flow_table_offload.c:1316:\tdestroy_workqueue(nf_flow_offload_add_wq);\nnet/netfilter/nf_flow_table_offload.c-1317-\treturn -ENOMEM;\n--\nnet/netfilter/nf_flow_table_offload.c=1320=void nf_flow_table_offload_exit(void)\nnet/netfilter/nf_flow_table_offload.c-1321-{\nnet/netfilter/nf_flow_table_offload.c:1322:\tdestroy_workqueue(nf_flow_offload_add_wq);\nnet/netfilter/nf_flow_table_offload.c-1323-\tdestroy_workqueue(nf_flow_offload_del_wq);\n"
}

gemini-3.1-pro-preview

							input: 41074
							output: 46
							thoughts: 566

**My Refinement of the Symbol List**

Okay, let's refine this symbol list for our analysis. I've been carefully reviewing each function and its potential replacement, ensuring we maintain semantic equivalence. First, `nf_flow_offload_add` remains our target as it's non-static. Now, I'm confirming my earlier assumptions regarding static functions and their replacements. I'll use `nf_flow_offload_ip_hook` instead of the static `nf_flow_tunnel_v4_push`, and `nf_flow_offload_ipv6_hook` instead of `nf_flow_tunnel_v6_push`. For `flow_offload_fill_route`, I'll use `flow_offload_route_init`.

Next, for `ebt_check_match`, I will use `ebt_check_entry`. For `update_counters`, I will use either `do_update_counters` or `do_ebt_set_ctl`, depending on the specific use case that I identify. For `compat_copy_ebt_replace_from_user`, I'm going with `compat_do_replace`. `hash_ip4_gc` is good as it is. I will be using `nfulnl_log_packet` as the replacement for `__build_packet_message`, after which I will consider replacing the static `nfqnl_build_packet_message`. We'll use `u32_mt` to replace `u32_match_it`, and `nf_ct_frag6_gather` for both `nf_ct_frag6_reasm` and `find_prev_fhdr`.

So, here's my updated, final list of focus symbols:

*   `ip_vs_in_icmp`
*   `sctp_state_transition`
*   `tcp_state_transition`
*   `udp_state_transition`
*   `flow_offload_route_init`
*   `nf_flow_offload_ip_hook`
*   `nf_flow_offload_ipv6_hook`
*   `nf_flow_offload_add`
*   `ebt_check_entry`
*   `do_ebt_set_ctl`
*   `compat_do_replace`
*   `nf_ct_frag6_gather`
*   `hash_ip4_gc`
*   `hash_ip4_resize`
*   `hash_ip4_add`
*   `hash_ip4_del`
*   `hash_ip6_gc`
*   `hash_ip6_resize`
*   `hash_ip6_add`
*   `hash_ip6_del`
*   `nfulnl_log_packet`
*   `nfqnl_build_packet_message`
*   `nft_lookup_eval`
*   `u32_mt`

Ah, hold on... `sctp_state_transition` is static! I'll quickly check the source file `ip_vs_proto_sctp.c` to see if there's a more appropriate non-static counterpart. Now I can move on with confidence and build my analysis.

{
  "Expression": "sctp_state_transition",
  "PathPrefix": "net/netfilter/ipvs/ip_vs_proto_sctp.c"
}

{
  "Output": "net/netfilter/ipvs/ip_vs_proto_sctp.c=464=static void\nnet/netfilter/ipvs/ip_vs_proto_sctp.c:465:sctp_state_transition(struct ip_vs_conn *cp, int direction,\nnet/netfilter/ipvs/ip_vs_proto_sctp.c-466-\t\tconst struct sk_buff *skb, struct ip_vs_proto_data *pd,\n--\nnet/netfilter/ipvs/ip_vs_proto_sctp.c=566=struct ip_vs_protocol ip_vs_protocol_sctp = {\n--\nnet/netfilter/ipvs/ip_vs_proto_sctp.c-582-\t.state_name\t= sctp_state_name,\nnet/netfilter/ipvs/ip_vs_proto_sctp.c:583:\t.state_transition = sctp_state_transition,\nnet/netfilter/ipvs/ip_vs_proto_sctp.c-584-\t.app_conn_bind\t= sctp_app_conn_bind,\n"
}

gemini-3.1-pro-preview

							input: 42715
							output: 38
							thoughts: 204

**Analyzing Potential Fuzzing Targets**

Okay, so I'm looking at this static piece of code, but the key is that it's assigned to a function pointer. That's interesting, because even though it's technically static, if it's referenced through that pointer, and especially if it ends up in the symbol table, then syzkaller should still be able to fuzz it. So that makes it a possibility.

The same line of reasoning goes for `tcp_state_transition` and `udp_state_transition`. They're worth a look, too. They probably are also assigned to a function pointer somewhere.

Now, let's turn our attention to `hash_ip4_gc`. That's a static function generated by a macro, which makes things a bit more interesting to figure out if it is in the symbol table, too. That could be a juicy target, depending on what the macro does.

Alright, time to go back and double-check the configuration options. Let's see... I've got `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, `IP_SET_HASH_IP`, `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32` and `NF_DEFRAG_IPV6`.

I'm wondering though, is `IP_VS_PROTO_TCP` even a config? It's related to the other configs. I should really verify that.

{
  "Expression": "config IP_VS_PROTO_TCP",
  "PathPrefix": "net/netfilter/ipvs/Kconfig"
}

{
  "error": "no matches"
}

gemini-3.1-pro-preview

							input: 43339
							output: 37
							thoughts: 24

Okay, here's my interpretation of that thought process, assuming I'm deep in the weeds of IP Virtual Server (IPVS) configuration:

**Initial IPVS Configuration Inquiry**

Hmm, so `IP_VS_PROTO_TCP`... I need to clarify something quickly. Is that module, `IP_VS_PROTO_TCP`, automatically loaded and active as part of the core `IP_VS` module suite? Or is it something that needs to be explicitly enabled, a separate module that's often included but not guaranteed? I need to know this foundational aspect of its default behavior. Understanding this base level of interaction is important before I move forward.

{
  "Expression": "IP_VS_PROTO_TCP",
  "PathPrefix": "net/netfilter/ipvs/Kconfig"
}

{
  "Output": "net/netfilter/ipvs/Kconfig=77=comment \"IPVS transport protocol load balancing support\"\nnet/netfilter/ipvs/Kconfig-78-\nnet/netfilter/ipvs/Kconfig:79:config\tIP_VS_PROTO_TCP\nnet/netfilter/ipvs/Kconfig-80-\tbool \"TCP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig=321=config\tIP_VS_FTP\nnet/netfilter/ipvs/Kconfig-322-\ttristate \"FTP protocol helper\"\nnet/netfilter/ipvs/Kconfig:323:\tdepends on IP_VS_PROTO_TCP \u0026\u0026 NF_CONNTRACK \u0026\u0026 NF_NAT \u0026\u0026 \\\nnet/netfilter/ipvs/Kconfig-324-\t\tNF_CONNTRACK_FTP\n"
}

gemini-3.1-pro-preview

							input: 43747
							output: 37
							thoughts: 67

**Debugging a Configuration Check**

Okay, here we go, looking at this configuration. Ah, yes, it's `config IP_VS_PROTO_TCP`. Wait a second… that grep failed, didn't it? Right, I bet I know what happened. There's probably a tab character in that line. Yup, here it is: `config\tIP_VS_PROTO_TCP`. Annoying, but easily spotted. So `IP_VS_PROTO_TCP` is definitely a valid configuration item. Now, let me see, what about `IP_VS_PROTO_UDP`? I need to check that one next.

{
  "Expression": "IP_VS_PROTO_UDP",
  "PathPrefix": "net/netfilter/ipvs/Kconfig"
}

{
  "Output": "net/netfilter/ipvs/Kconfig=79=config\tIP_VS_PROTO_TCP\n--\nnet/netfilter/ipvs/Kconfig-84-\nnet/netfilter/ipvs/Kconfig:85:config\tIP_VS_PROTO_UDP\nnet/netfilter/ipvs/Kconfig-86-\tbool \"UDP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig=345=config\tIP_VS_PE_SIP\nnet/netfilter/ipvs/Kconfig-346-\ttristate \"SIP persistence engine\"\nnet/netfilter/ipvs/Kconfig:347:\tdepends on IP_VS_PROTO_UDP\nnet/netfilter/ipvs/Kconfig-348-\tdepends on NF_CONNTRACK_SIP\n"
}

gemini-3.1-pro-preview

							input: 44191
							output: 39
							thoughts: 21

Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person:

**Validating Protocol Inclusion**

Alright, that initial assessment – yes, it's valid. We can move forward with that assumption. Now, I need to consider a specific point: what about the inclusion of the `IP_VS_PROTO_SCTP` flag? I need to quickly recall the implications of its usage, and its relationship to our overall system architecture. It's crucial we don't overlook its impact on traffic flows or potential interactions with other protocol handlers. Need to assess that quickly.

{
  "Expression": "IP_VS_PROTO_SCTP",
  "PathPrefix": "net/netfilter/ipvs/Kconfig"
}

{
  "Output": "net/netfilter/ipvs/Kconfig=100=config\tIP_VS_PROTO_AH\n--\nnet/netfilter/ipvs/Kconfig-105-\nnet/netfilter/ipvs/Kconfig:106:config  IP_VS_PROTO_SCTP\nnet/netfilter/ipvs/Kconfig-107-\tbool \"SCTP load balancing support\"\n"
}

gemini-3.1-pro-preview

							input: 44489
							output: 442
							thoughts: 1570

**Fuzzing Target Refinement**

Okay, so I've gone through this patch and confirmed its validity as a target for fuzzing. The configurations enabling the relevant features are `IP_VS`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, `IP_VS_PROTO_SCTP`, `NF_FLOW_TABLE`, `BRIDGE_NF_EBTABLES`, `IP_SET`, `IP_SET_HASH_IP`, `NETFILTER_NETLINK_LOG`, `NETFILTER_NETLINK_QUEUE`, `NF_TABLES`, `NETFILTER_XT_MATCH_U32`, and `NF_DEFRAG_IPV6`. I've made a quick mental note of those.

Now, I've got a list of symbols to focus the fuzzing efforts. It started with some known ones: `ip_vs_in_icmp`, `sctp_state_transition`, `tcp_state_transition`, `udp_state_transition`, `flow_offload_route_init`, `nf_flow_offload_ip_hook`, `nf_flow_offload_ipv6_hook`, `nf_flow_offload_add`, `ebt_check_entry`, `do_ebt_set_ctl`, `compat_do_replace`, `nf_ct_frag6_gather`, and `nft_lookup_eval`. I’ve double checked the ipset symbols like `hash_ip4_gc`, `hash_ip4_resize`, `hash_ip4_add`, `hash_ip4_del`, `hash_ip6_gc`, `hash_ip6_resize`, `hash_ip6_add`, and `hash_ip6_del`, all of which I confirmed are correctly generated.

I dug a bit deeper. I needed to be sure about functions called by other functions, and since I need the entrypoint to the function, I checked to see what was most appropriate. After confirming `nf_flow_offload_add` sets `NF_FLOW_HW` and calls `nf_flow_offload_refresh` I added the refresh to the list. I decided to use `nf_flow_offload_ip_hook` instead of the static `nf_flow_tunnel_ipip_push`. I'll use `u32_mt` instead of the static `u32_match_it`, and `nfulnl_log_packet` instead of the static inline `__build_packet_message`, `nfqnl_build_packet_message` over its static alternative. The static function `nf_ct_frag6_reasm` is covered by `nf_ct_frag6_gather`, and the static function `find_prev_fhdr` also can be covered by it. Similarly, the static inline `ebt_check_match` has been replaced with `ebt_check_entry`, `update_counters` can be represented by `do_ebt_set_ctl`, and  `compat_copy_ebt_replace_from_user` has `compat_do_replace`.

So, the definitive list, after this thorough review, is the following:

*   `ip_vs_in_icmp`
*   `sctp_state_transition`
*   `tcp_state_transition`
*   `udp_state_transition`
*   `flow_offload_route_init`
*   `nf_flow_offload_ip_hook`
*   `nf_flow_offload_ipv6_hook`
*   `nf_flow_offload_add`
*   `nf_flow_offload_refresh`
*   `ebt_check_entry`
*   `do_ebt_set_ctl`
*   `compat_do_replace`
*   `nf_ct_frag6_gather`
*   `hash_ip4_gc`
*   `hash_ip4_resize`
*   `hash_ip4_add`
*   `hash_ip4_del`
*   `hash_ip6_gc`
*   `hash_ip6_resize`
*   `hash_ip6_add`
*   `hash_ip6_del`
*   `nfulnl_log_packet`
*   `nfqnl_build_packet_message`
*   `nft_lookup_eval`
*   `u32_mt`

Given these symbols, and the identified configurations, this patch seems like a solid target for fuzzing. It's got netfilter and ipvs components, and those are definitely worth

{
  "EnableConfigs": [
    "IP_VS",
    "IP_VS_PROTO_TCP",
    "IP_VS_PROTO_UDP",
    "IP_VS_PROTO_SCTP",
    "NF_FLOW_TABLE",
    "BRIDGE_NF_EBTABLES",
    "IP_SET",
    "IP_SET_HASH_IP",
    "NETFILTER_NETLINK_LOG",
    "NETFILTER_NETLINK_QUEUE",
    "NF_TABLES",
    "NETFILTER_XT_MATCH_U32",
    "NF_DEFRAG_IPV6"
  ],
  "FocusSymbols": [
    "ip_vs_in_icmp",
    "sctp_state_transition",
    "tcp_state_transition",
    "udp_state_transition",
    "flow_offload_route_init",
    "nf_flow_offload_ip_hook",
    "nf_flow_offload_ipv6_hook",
    "nf_flow_offload_add",
    "nf_flow_offload_refresh",
    "ebt_check_entry",
    "do_ebt_set_ctl",
    "compat_do_replace",
    "nf_ct_frag6_gather",
    "hash_ip4_gc",
    "hash_ip4_resize",
    "hash_ip4_add",
    "hash_ip4_del",
    "hash_ip6_gc",
    "hash_ip6_resize",
    "hash_ip6_add",
    "hash_ip6_del",
    "nfulnl_log_packet",
    "nfqnl_build_packet_message",
    "nft_lookup_eval",
    "u32_mt"
  ],
  "Reasoning": "The patch contains functional changes to various netfilter and ipvs components, fixing potential out-of-bounds reads, incorrect header length calculations, and synchronization issues. It modifies reachable core kernel logic and should be fuzzed.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "IP_VS",
    "IP_VS_PROTO_TCP",
    "IP_VS_PROTO_UDP",
    "IP_VS_PROTO_SCTP",
    "NF_FLOW_TABLE",
    "BRIDGE_NF_EBTABLES",
    "IP_SET",
    "IP_SET_HASH_IP",
    "NETFILTER_NETLINK_LOG",
    "NETFILTER_NETLINK_QUEUE",
    "NF_TABLES",
    "NETFILTER_XT_MATCH_U32",
    "NF_DEFRAG_IPV6"
  ],
  "FocusSymbols": [
    "ip_vs_in_icmp",
    "sctp_state_transition",
    "tcp_state_transition",
    "udp_state_transition",
    "flow_offload_route_init",
    "nf_flow_offload_ip_hook",
    "nf_flow_offload_ipv6_hook",
    "nf_flow_offload_add",
    "nf_flow_offload_refresh",
    "ebt_check_entry",
    "do_ebt_set_ctl",
    "compat_do_replace",
    "nf_ct_frag6_gather",
    "hash_ip4_gc",
    "hash_ip4_resize",
    "hash_ip4_add",
    "hash_ip4_del",
    "hash_ip6_gc",
    "hash_ip6_resize",
    "hash_ip6_add",
    "hash_ip6_del",
    "nfulnl_log_packet",
    "nfqnl_build_packet_message",
    "nft_lookup_eval",
    "u32_mt"
  ],
  "Reasoning": "The patch contains functional changes to various netfilter and ipvs components, fixing potential out-of-bounds reads, incorrect header length calculations, and synchronization issues. It modifies reachable core kernel logic and should be fuzzed.",
  "WorthFuzzing": true
}

LLM Calls Summary:
Total Calls	Total Tokens	Avg Tokens	Total Duration (Seconds)	Avg Duration (Seconds)

Tool Calls Summary:
Total Calls	Total Duration (Seconds)	Avg Duration (Seconds)