| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/09/29 01:14 | flow | patch-triage |
2mArgs:null Results: {
"EnableConfigs": [
"NETFILTER_NETLINK_HOOK",
"NF_TABLES",
"NF_CT_NETLINK",
"NF_CONNTRACK",
"NF_FLOW_TABLE",
"NET_ACT_CT",
"NFT_SYNPROXY",
"NF_NAT"
],
"FocusSymbols": [
"nfnl_hook_dump",
"nfnl_hook_dump_nat",
"ctnetlink_alloc_filter",
"ctnetlink_filter_match_tuple",
"nf_ct_seqadj_reset",
"ipv4_synproxy_hook",
"ipv6_synproxy_hook",
"nf_flow_table_cleanup",
"tcf_ct_flow_table_get"
],
"KMSANReasoning": "The patch series touches several netfilter components:\n1. Adds `CTA_FILTER_ZONE` flag to conntrack netlink filtering (`net/netfilter/nf_conntrack_netlink.c`), where the filter structure is allocated with `kzalloc_obj` ensuring all fields are zero-initialized, and fixes IPv6 address comparison logic (`ipv6_addr_equal`).\n2. Introduces hook generation sequence counters (`hook_base_seq` and `nat_hook_base_seq`) to detect concurrent modifications during netlink dumps (`nfnetlink_hook.c`, `core.c`, `nf_nat_core.c`), both initialized to 1 in `netfilter_net_init`.\n3. Adds `nf_ct_seqadj_reset` to explicitly zero `offset_before` and `offset_after` under lock in `nf_conntrack_seqadj.c`.\n4. Fixes flowtable cleanup to filter by network namespace and moves `write_pnet(\u0026ct_ft-\u003enf_ft.net, net)` before `nf_flow_table_init` in `act_ct.c`, ensuring `flowtable-\u003enet` is initialized before being added to the global flowtables list.\n5. Minor conntrack statistics adjustments, dead code elimination, and comment/typo fixes.\n\nNone of the changes introduce uninitialized variables, expose struct padding or uninitialized buffers to user space, or alter buffer bounds in a way that allows reads of uninitialized memory. Standard KASAN, LOCKDEP, and syzkaller fuzzing are sufficient to detect memory corruption, race conditions, or lifetime issues. KMSAN is not required.",
"NeedsKMSAN": false,
"Reasoning": "The patch series touches reachable executable code in core networking and Netfilter subsystems:\n1. Concurrency handling in Netfilter base hook dumps over nfnetlink is refactored with base sequence tracking (net/netfilter/nfnetlink_hook.c, core.c, nf_nat_core.c).\n2. Conntrack netlink filtering gains support for CTA_FILTER_ZONE and fixes an IPv6 comparison bug in tuple matching (net/netfilter/nf_conntrack_netlink.c).\n3. Conntrack sequence adjustment adds nf_ct_seqadj_reset used by synproxy upon reopening connections (net/netfilter/nf_conntrack_seqadj.c, nf_synproxy_core.c).\n4. Flowtable netns cleanup and tc act_ct flowtable initialization ordering are corrected (net/netfilter/nf_flow_table_core.c, net/sched/act_ct.c).\nThese changes are reachable via Netlink sockets, network packet processing, and tc actions without requiring specialized hardware.",
"WorthFuzzing": true
} |
| 1/1 | 2026/09/29 01:14 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit babef3608013320491bdd26d91a3451f630c9b0b\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Tue Sep 29 01:14:29 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/Documentation/netlink/specs/conntrack.yaml b/Documentation/netlink/specs/conntrack.yaml\nindex 1d163130241a7..56c13705243b3 100644\n--- a/Documentation/netlink/specs/conntrack.yaml\n+++ b/Documentation/netlink/specs/conntrack.yaml\n@@ -393,6 +393,12 @@ attribute-sets:\n name: reply-flags\n type: u32\n doc: bitmask of tuple fields to filter on, reply direction\n+ -\n+ name: zone\n+ type: flag\n+ doc: \u003e-\n+ Filter on conntrack zone id; requires the top-level zone\n+ (``CTA_ZONE``) attribute.\n -\n name: conntrack-attrs\n attributes:\ndiff --git a/Documentation/networking/nf_conntrack-sysctl.rst b/Documentation/networking/nf_conntrack-sysctl.rst\nindex 35f889259fcdd..4426cce2a73f3 100644\n--- a/Documentation/networking/nf_conntrack-sysctl.rst\n+++ b/Documentation/networking/nf_conntrack-sysctl.rst\n@@ -44,7 +44,7 @@ nf_conntrack_events - BOOLEAN\n \n nf_conntrack_expect_max - INTEGER\n \tMaximum size of expectation table. Default value is\n-\tnf_conntrack_buckets / 256. Minimum is 1.\n+\tnf_conntrack_buckets / 64. Minimum is 1.\n \n nf_conntrack_frag6_high_thresh - INTEGER\n \tdefault 262144\ndiff --git a/include/net/netfilter/nf_conntrack_seqadj.h b/include/net/netfilter/nf_conntrack_seqadj.h\nindex 883c414b768ee..0f5bbb14a25aa 100644\n--- a/include/net/netfilter/nf_conntrack_seqadj.h\n+++ b/include/net/netfilter/nf_conntrack_seqadj.h\n@@ -33,6 +33,7 @@ static inline struct nf_conn_seqadj *nfct_seqadj_ext_add(struct nf_conn *ct)\n \n int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,\n \t\t s32 off);\n+void nf_ct_seqadj_reset(struct nf_conn *ct, enum ip_conntrack_info ctinfo);\n int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,\n \t\t __be32 seq, s32 off);\n void nf_ct_tcp_seqadj_set(struct sk_buff *skb, struct nf_conn *ct,\ndiff --git a/include/net/netns/netfilter.h b/include/net/netns/netfilter.h\nindex a6a0bf4a247e5..7fd78394d1e7b 100644\n--- a/include/net/netns/netfilter.h\n+++ b/include/net/netns/netfilter.h\n@@ -33,5 +33,7 @@ struct netns_nf {\n #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)\n \tunsigned int defrag_ipv6_users;\n #endif\n+\tunsigned int hook_base_seq;\n+\tunsigned int nat_hook_base_seq;\n };\n #endif\ndiff --git a/include/uapi/linux/netfilter/nfnetlink_conntrack.h b/include/uapi/linux/netfilter/nfnetlink_conntrack.h\nindex 43233af75b9d5..985f9c08d3e9b 100644\n--- a/include/uapi/linux/netfilter/nfnetlink_conntrack.h\n+++ b/include/uapi/linux/netfilter/nfnetlink_conntrack.h\n@@ -285,6 +285,7 @@ enum ctattr_filter {\n \tCTA_FILTER_UNSPEC,\n \tCTA_FILTER_ORIG_FLAGS,\n \tCTA_FILTER_REPLY_FLAGS,\n+\tCTA_FILTER_ZONE,\n \t__CTA_FILTER_MAX\n };\n #define CTA_FILTER_MAX (__CTA_FILTER_MAX - 1)\ndiff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c\nindex db307fa49f3f6..cf747e1e17a36 100644\n--- a/net/ipv4/netfilter/arp_tables.c\n+++ b/net/ipv4/netfilter/arp_tables.c\n@@ -58,7 +58,7 @@ static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,\n /*\n * Unfortunately, _b and _mask are not aligned to an int (or long int)\n * Some arches dont care, unrolling the loop is a win on them.\n- * For other arches, we only have a 16bit alignement.\n+ * For other arches, we only have a 16bit alignment.\n */\n static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)\n {\ndiff --git a/net/netfilter/core.c b/net/netfilter/core.c\nindex 675a1034b3400..940dea2663e95 100644\n--- a/net/netfilter/core.c\n+++ b/net/netfilter/core.c\n@@ -386,6 +386,15 @@ static void nf_static_key_dec(const struct nf_hook_ops *reg, int pf)\n #endif\n }\n \n+static void bump_hook_base_seq(struct net *net)\n+{\n+\tunsigned int base_seq = READ_ONCE(net-\u003enf.hook_base_seq);\n+\n+\twhile (++base_seq == 0)\n+\t\t;\n+\tsmp_store_release(\u0026net-\u003enf.hook_base_seq, base_seq);\n+}\n+\n static int __nf_register_net_hook(struct net *net, int pf,\n \t\t\t\t const struct nf_hook_ops *reg)\n {\n@@ -430,6 +439,7 @@ static int __nf_register_net_hook(struct net *net, int pf,\n \tif (!IS_ERR(new_hooks)) {\n \t\thooks_validate(new_hooks);\n \t\trcu_assign_pointer(*pp, new_hooks);\n+\t\tbump_hook_base_seq(net);\n \t}\n \n \tmutex_unlock(\u0026nf_hook_mutex);\n@@ -483,6 +493,7 @@ static void __nf_unregister_net_hook(struct net *net, int pf,\n {\n \tstruct nf_hook_entries __rcu **pp;\n \tstruct nf_hook_entries *p;\n+\tbool found;\n \n \tpp = nf_hook_entry_head(net, pf, reg-\u003ehooknum, reg-\u003edev);\n \tif (!pp)\n@@ -496,7 +507,8 @@ static void __nf_unregister_net_hook(struct net *net, int pf,\n \t\treturn;\n \t}\n \n-\tif (nf_remove_net_hook(p, reg)) {\n+\tfound = nf_remove_net_hook(p, reg);\n+\tif (found) {\n #ifdef CONFIG_NETFILTER_INGRESS\n \t\tif (nf_ingress_hook(reg, pf))\n \t\t\tnet_dec_ingress_queue();\n@@ -511,6 +523,8 @@ static void __nf_unregister_net_hook(struct net *net, int pf,\n \t}\n \n \tp = __nf_hook_entries_try_shrink(p, pp);\n+\tif (found)\n+\t\tbump_hook_base_seq(net);\n \tmutex_unlock(\u0026nf_hook_mutex);\n \tif (!p)\n \t\treturn;\n@@ -784,6 +798,8 @@ static int __net_init netfilter_net_init(struct net *net)\n \t\treturn -ENOMEM;\n \t}\n #endif\n+\tnet-\u003enf.hook_base_seq = 1;\n+\tnet-\u003enf.nat_hook_base_seq = 1;\n \n \treturn 0;\n }\ndiff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c\nindex 0a86a170ba906..4aeb767088cfa 100644\n--- a/net/netfilter/ipset/ip_set_core.c\n+++ b/net/netfilter/ipset/ip_set_core.c\n@@ -1426,7 +1426,7 @@ static int ip_set_swap(struct sk_buff *skb, const struct nfnl_info *info,\n \t\treturn -IPSET_ERR_EXIST_SETNAME2;\n \n \t/* Features must not change.\n-\t * Not an artifical restriction anymore, as we must prevent\n+\t * Not an artificial restriction anymore, as we must prevent\n \t * possible loops created by swapping in setlist type of sets.\n \t */\n \tif (!(from-\u003etype-\u003efeatures == to-\u003etype-\u003efeatures \u0026\u0026\ndiff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c\nindex 5383aeafb0aed..4dacd5af65db9 100644\n--- a/net/netfilter/ipvs/ip_vs_sync.c\n+++ b/net/netfilter/ipvs/ip_vs_sync.c\n@@ -1344,7 +1344,7 @@ static void set_mcast_pmtudisc(struct sock *sk, int val)\n }\n \n /*\n- * Specifiy default interface for outgoing multicasts\n+ * Specify default interface for outgoing multicasts\n */\n static int set_mcast_if(struct sock *sk, struct net_device *dev)\n {\ndiff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c\nindex d0d9e5ea84a09..f9b8927327ba9 100644\n--- a/net/netfilter/nf_conntrack_core.c\n+++ b/net/netfilter/nf_conntrack_core.c\n@@ -1169,7 +1169,6 @@ nf_ct_resolve_clash(struct sk_buff *skb, struct nf_conntrack_tuple_hash *h,\n \t\treturn ret;\n \n drop:\n-\tNF_CT_STAT_INC(net, drop);\n \tNF_CT_STAT_INC(net, insert_failed);\n \treturn NF_DROP;\n }\n@@ -1259,7 +1258,6 @@ __nf_conntrack_confirm(struct sk_buff *skb)\n \t\tif (chainlen++ \u003e max_chainlen) {\n chaintoolong:\n \t\t\tNF_CT_STAT_INC(net, chaintoolong);\n-\t\t\tNF_CT_STAT_INC(net, insert_failed);\n \t\t\tret = NF_DROP;\n \t\t\tgoto dying;\n \t\t}\n@@ -2067,9 +2065,10 @@ nf_conntrack_in(struct sk_buff *skb, const struct nf_hook_state *state)\n \t\tif (ret == -NF_REPEAT)\n \t\t\tgoto repeat;\n \n-\t\tNF_CT_STAT_INC_ATOMIC(state-\u003enet, invalid);\n \t\tif (ret == NF_DROP)\n \t\t\tNF_CT_STAT_INC_ATOMIC(state-\u003enet, drop);\n+\t\telse\n+\t\t\tNF_CT_STAT_INC_ATOMIC(state-\u003enet, invalid);\n \n \t\tret = -ret;\n \t\tgoto out;\ndiff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c\nindex 4e5d7c7014368..4b6abe36028e3 100644\n--- a/net/netfilter/nf_conntrack_netlink.c\n+++ b/net/netfilter/nf_conntrack_netlink.c\n@@ -911,6 +911,7 @@ struct ctnetlink_filter {\n static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {\n \t[CTA_FILTER_ORIG_FLAGS]\t\t= NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),\n \t[CTA_FILTER_REPLY_FLAGS]\t= NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),\n+\t[CTA_FILTER_ZONE]\t\t= { .type = NLA_FLAG },\n };\n \n static int ctnetlink_parse_filter(const struct nlattr *attr,\n@@ -930,6 +931,9 @@ static int ctnetlink_parse_filter(const struct nlattr *attr,\n \tif (tb[CTA_FILTER_REPLY_FLAGS])\n \t\tfilter-\u003ereply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);\n \n+\tif (tb[CTA_FILTER_ZONE])\n+\t\tfilter-\u003ezone_filter = true;\n+\n \treturn 0;\n }\n \n@@ -1006,6 +1010,7 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)\n \tif (err)\n \t\tgoto err_filter;\n \n+\t/* CTA_ZONE is allowed without CTA_FILTER_ZONE. */\n \tif (cda[CTA_ZONE]) {\n \t\terr = ctnetlink_parse_zone(cda[CTA_ZONE], \u0026filter-\u003ezone);\n \t\tif (err \u003c 0)\n@@ -1020,6 +1025,12 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)\n \tif (err \u003c 0)\n \t\tgoto err_filter;\n \n+\t/* CTA_FILTER_ZONE cannot be set without CTA_ZONE. */\n+\tif (filter-\u003ezone_filter \u0026\u0026 !cda[CTA_ZONE]) {\n+\t\terr = -EINVAL;\n+\t\tgoto err_filter;\n+\t}\n+\n \tif (filter-\u003eorig_flags) {\n \t\tif (!cda[CTA_TUPLE_ORIG]) {\n \t\t\terr = -EINVAL;\n@@ -1098,13 +1109,13 @@ static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,\n \t\tbreak;\n \tcase NFPROTO_IPV6:\n \t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_IP_SRC)) \u0026\u0026\n-\t\t !ipv6_addr_cmp(\u0026filter_tuple-\u003esrc.u3.in6,\n-\t\t\t\t \u0026ct_tuple-\u003esrc.u3.in6))\n+\t\t !ipv6_addr_equal(\u0026filter_tuple-\u003esrc.u3.in6,\n+\t\t\t\t \u0026ct_tuple-\u003esrc.u3.in6))\n \t\t\treturn 0;\n \n \t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_IP_DST)) \u0026\u0026\n-\t\t !ipv6_addr_cmp(\u0026filter_tuple-\u003edst.u3.in6,\n-\t\t\t\t \u0026ct_tuple-\u003edst.u3.in6))\n+\t\t !ipv6_addr_equal(\u0026filter_tuple-\u003edst.u3.in6,\n+\t\t\t\t \u0026ct_tuple-\u003edst.u3.in6))\n \t\t\treturn 0;\n \t\tbreak;\n \t}\ndiff --git a/net/netfilter/nf_conntrack_seqadj.c b/net/netfilter/nf_conntrack_seqadj.c\nindex d75e8dafb189e..b7b166a8ad58c 100644\n--- a/net/netfilter/nf_conntrack_seqadj.c\n+++ b/net/netfilter/nf_conntrack_seqadj.c\n@@ -31,6 +31,23 @@ int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,\n }\n EXPORT_SYMBOL_GPL(nf_ct_seqadj_init);\n \n+void nf_ct_seqadj_reset(struct nf_conn *ct, enum ip_conntrack_info ctinfo)\n+{\n+\tstruct nf_conn_seqadj *seqadj = nfct_seqadj(ct);\n+\tenum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);\n+\tstruct nf_ct_seqadj *this_way;\n+\n+\tif (unlikely(!seqadj))\n+\t\treturn;\n+\n+\tspin_lock_bh(\u0026ct-\u003elock);\n+\tthis_way = \u0026seqadj-\u003eseq[dir];\n+\tthis_way-\u003eoffset_before\t = 0;\n+\tthis_way-\u003eoffset_after\t = 0;\n+\tspin_unlock_bh(\u0026ct-\u003elock);\n+}\n+EXPORT_SYMBOL_GPL(nf_ct_seqadj_reset);\n+\n int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,\n \t\t __be32 seq, s32 off)\n {\ndiff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c\nindex 934c6151f558b..bd8f9cf394ff1 100644\n--- a/net/netfilter/nf_flow_table_core.c\n+++ b/net/netfilter/nf_flow_table_core.c\n@@ -737,14 +737,9 @@ static void nf_flow_table_do_cleanup(struct nf_flowtable *flow_table,\n {\n \tstruct net_device *dev = data;\n \n-\tif (!dev) {\n-\t\tflow_offload_teardown(flow);\n-\t\treturn;\n-\t}\n-\n-\tif (net_eq(nf_ct_net(flow-\u003ect), dev_net(dev)) \u0026\u0026\n-\t (flow-\u003etuplehash[0].tuple.iifidx == dev-\u003eifindex ||\n-\t flow-\u003etuplehash[1].tuple.iifidx == dev-\u003eifindex))\n+\tif (!dev ||\n+\t flow-\u003etuplehash[0].tuple.iifidx == dev-\u003eifindex ||\n+\t flow-\u003etuplehash[1].tuple.iifidx == dev-\u003eifindex)\n \t\tflow_offload_teardown(flow);\n }\n \n@@ -761,8 +756,10 @@ void nf_flow_table_cleanup(struct net_device *dev)\n \tstruct nf_flowtable *flowtable;\n \n \tmutex_lock(\u0026flowtable_lock);\n-\tlist_for_each_entry(flowtable, \u0026flowtables, list)\n-\t\tnf_flow_table_gc_cleanup(flowtable, dev);\n+\tlist_for_each_entry(flowtable, \u0026flowtables, list) {\n+\t\tif (net_eq(read_pnet(\u0026flowtable-\u003enet), dev_net(dev)))\n+\t\t\tnf_flow_table_gc_cleanup(flowtable, dev);\n+\t}\n \tmutex_unlock(\u0026flowtable_lock);\n }\n EXPORT_SYMBOL_GPL(nf_flow_table_cleanup);\ndiff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c\nindex 84f82957e66bd..5ddd5fc95b24a 100644\n--- a/net/netfilter/nf_nat_core.c\n+++ b/net/netfilter/nf_nat_core.c\n@@ -1160,6 +1160,15 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct,\n }\n #endif\n \n+static void bump_nat_hook_base_seq(struct net *net)\n+{\n+\tunsigned int base_seq = READ_ONCE(net-\u003enf.nat_hook_base_seq);\n+\n+\twhile (++base_seq == 0)\n+\t\t;\n+\tsmp_store_release(\u0026net-\u003enf.nat_hook_base_seq, base_seq);\n+}\n+\n static struct nf_ct_helper_expectfn follow_master_nat = {\n \t.name\t\t= \"nat-follow-master\",\n \t.expectfn\t= nf_nat_follow_master,\n@@ -1245,6 +1254,7 @@ int nf_nat_register_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,\n \t\tnat_proto_net-\u003enat_hook_ops = nat_ops;\n \n \tnat_proto_net-\u003eusers++;\n+\tbump_nat_hook_base_seq(net);\n \n \tmutex_unlock(\u0026nf_nat_proto_mutex);\n \n@@ -1299,6 +1309,7 @@ void nf_nat_unregister_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,\n \t\tgoto unlock;\n \tpriv = nat_ops[hooknum].priv;\n \tnf_hook_entries_delete_raw(\u0026priv-\u003eentries, ops);\n+\tbump_nat_hook_base_seq(net);\n \n \tif (nat_proto_net-\u003eusers == 0) {\n \t\tnf_unregister_net_hooks(net, nat_ops, ops_count);\ndiff --git a/net/netfilter/nf_synproxy_core.c b/net/netfilter/nf_synproxy_core.c\nindex 9fc959ba20300..401ce5a13f3f4 100644\n--- a/net/netfilter/nf_synproxy_core.c\n+++ b/net/netfilter/nf_synproxy_core.c\n@@ -686,7 +686,7 @@ ipv4_synproxy_hook(void *priv, struct sk_buff *skb,\n \t\t * adjustments, they will get initialized once the connection is\n \t\t * reestablished.\n \t\t */\n-\t\tnf_ct_seqadj_init(ct, ctinfo, 0);\n+\t\tnf_ct_seqadj_reset(ct, ctinfo);\n \t\tsynproxy-\u003etsoff = 0;\n \t\tthis_cpu_inc(snet-\u003estats-\u003econn_reopened);\n \t\tfallthrough;\n@@ -1116,7 +1116,7 @@ ipv6_synproxy_hook(void *priv, struct sk_buff *skb,\n \t\t * adjustments, they will get initialized once the connection is\n \t\t * reestablished.\n \t\t */\n-\t\tnf_ct_seqadj_init(ct, ctinfo, 0);\n+\t\tnf_ct_seqadj_reset(ct, ctinfo);\n \t\tsynproxy-\u003etsoff = 0;\n \t\tthis_cpu_inc(snet-\u003estats-\u003econn_reopened);\n \t\tfallthrough;\ndiff --git a/net/netfilter/nfnetlink_hook.c b/net/netfilter/nfnetlink_hook.c\nindex 95005e9a60668..b05fd79397c5b 100644\n--- a/net/netfilter/nfnetlink_hook.c\n+++ b/net/netfilter/nfnetlink_hook.c\n@@ -54,7 +54,6 @@ static int nf_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,\n \n struct nfnl_dump_hook_data {\n \tchar devname[IFNAMSIZ];\n-\tunsigned long headv;\n \tu8 hook;\n };\n \n@@ -338,27 +337,47 @@ nfnl_hook_entries_head(u8 pf, unsigned int hook, struct net *net, const char *de\n }\n \n static int nfnl_hook_dump_nat(struct sk_buff *nlskb,\n-\t\t\t const struct nfnl_dump_hook_data *ctx,\n-\t\t\t const struct nf_hook_ops *ops,\n-\t\t\t int family, unsigned int seq)\n+\t\t\t struct netlink_callback *cb,\n+\t\t\t const struct nf_hook_ops *ops, int family)\n {\n \tstruct nf_nat_lookup_hook_priv *priv = ops-\u003epriv;\n-\tstruct nf_hook_entries *e = rcu_dereference(priv-\u003eentries);\n+\tstruct nfnl_dump_hook_data *ctx = cb-\u003edata;\n+\tstruct net *net = sock_net(nlskb-\u003esk);\n \tstruct nf_hook_ops **nat_ops;\n-\tint i, err;\n+\tunsigned int i = cb-\u003eargs[1];\n+\tstruct nf_hook_entries *e;\n+\tunsigned int base_seq;\n+\tint err = 0;\n \n+\tbase_seq = smp_load_acquire(\u0026net-\u003enf.nat_hook_base_seq);\n+\n+\te = rcu_dereference(priv-\u003eentries);\n \tif (!e)\n-\t\treturn 0;\n+\t\tgoto out;\n \n \tnat_ops = nf_hook_entries_get_hook_ops(e);\n \n-\tfor (i = 0; i \u003c e-\u003enum_hook_entries; i++) {\n-\t\terr = nfnl_hook_dump_one(nlskb, ctx, nat_ops[i],\n-\t\t\t\t\t ops-\u003epriority, family, seq);\n+\tfor (; i \u003c e-\u003enum_hook_entries; i++) {\n+\t\terr = nfnl_hook_dump_one(nlskb, ctx,\n+\t\t\t\t\t READ_ONCE(nat_ops[i]),\n+\t\t\t\t\t ops-\u003epriority, family,\n+\t\t\t\t\t cb-\u003enlh-\u003enlmsg_seq);\n \t\tif (err)\n-\t\t\treturn err;\n+\t\t\tbreak;\n+\n \t}\n-\treturn 0;\n+out:\n+\tif (!err)\n+\t\ti = 0;\n+\tcb-\u003eargs[1] = i;\n+\n+\tif (cb-\u003eargs[2] \u0026\u0026 base_seq != cb-\u003eargs[2]) {\n+\t\tcb-\u003eseq++;\n+\t\terr = -EINTR;\n+\t}\n+\tcb-\u003eargs[2] = base_seq;\n+\n+\treturn err;\n }\n \n static int nfnl_hook_dump(struct sk_buff *nlskb,\n@@ -373,35 +392,31 @@ static int nfnl_hook_dump(struct sk_buff *nlskb,\n \tunsigned int i = cb-\u003eargs[0];\n \n \trcu_read_lock();\n+\tcb-\u003eseq = smp_load_acquire(\u0026net-\u003enf.hook_base_seq);\n \n \te = nfnl_hook_entries_head(family, ctx-\u003ehook, net, ctx-\u003edevname);\n-\tif (!e)\n+\tif (!e || IS_ERR(e))\n \t\tgoto done;\n \n-\tif (IS_ERR(e)) {\n-\t\tcb-\u003eseq++;\n-\t\tgoto done;\n-\t}\n-\n-\tif ((unsigned long)e != ctx-\u003eheadv || i \u003e= e-\u003enum_hook_entries)\n-\t\tcb-\u003eseq++;\n-\n \tops = nf_hook_entries_get_hook_ops(e);\n \n \tfor (; i \u003c e-\u003enum_hook_entries; i++) {\n-\t\tif (ops[i]-\u003ehook_ops_type == NF_HOOK_OP_NAT)\n-\t\t\terr = nfnl_hook_dump_nat(nlskb, ctx, ops[i], family,\n-\t\t\t\t\t\t cb-\u003enlh-\u003enlmsg_seq);\n-\t\telse\n-\t\t\terr = nfnl_hook_dump_one(nlskb, ctx, ops[i],\n-\t\t\t\t\t\t ops[i]-\u003epriority, family,\n+\t\tconst struct nf_hook_ops *cur = READ_ONCE(ops[i]);\n+\n+\t\tif (cur-\u003ehook_ops_type == NF_HOOK_OP_NAT) {\n+\t\t\terr = nfnl_hook_dump_nat(nlskb, cb, cur, family);\n+\t\t} else {\n+\t\t\terr = nfnl_hook_dump_one(nlskb, ctx, cur,\n+\t\t\t\t\t\t cur-\u003epriority, family,\n \t\t\t\t\t\t cb-\u003enlh-\u003enlmsg_seq);\n+\t\t}\n \t\tif (err)\n \t\t\tbreak;\n \t}\n \n done:\n-\tnl_dump_check_consistent(cb, nlmsg_hdr(nlskb));\n+\tif (nlskb-\u003elen \u003e 0)\n+\t\tnl_dump_check_consistent(cb, nlmsg_hdr(nlskb));\n \trcu_read_unlock();\n \tcb-\u003eargs[0] = i;\n \treturn nlskb-\u003elen;\n@@ -442,10 +457,7 @@ static int nfnl_hook_dump_start(struct netlink_callback *cb)\n \t\treturn -ENOMEM;\n \n \tstrscpy(ctx-\u003edevname, name, sizeof(ctx-\u003edevname));\n-\tctx-\u003eheadv = (unsigned long)head;\n \tctx-\u003ehook = hooknum;\n-\n-\tcb-\u003eseq = 1;\n \tcb-\u003edata = ctx;\n \n \treturn 0;\ndiff --git a/net/netfilter/nfnetlink_osf.c b/net/netfilter/nfnetlink_osf.c\nindex e4835b0f4bb1a..c8cd6af95db47 100644\n--- a/net/netfilter/nfnetlink_osf.c\n+++ b/net/netfilter/nfnetlink_osf.c\n@@ -36,7 +36,6 @@ static inline int nf_osf_ttl(const struct sk_buff *skb,\n \tswitch (ttl_check) {\n \tcase NF_OSF_TTL_TRUE:\n \t\treturn ip-\u003ettl == f_ttl;\n-\t\tbreak;\n \tcase NF_OSF_TTL_NOCHECK:\n \t\treturn 1;\n \tcase NF_OSF_TTL_LESS:\ndiff --git a/net/sched/act_ct.c b/net/sched/act_ct.c\nindex 411e3dd92d072..e26c0d5b2176b 100644\n--- a/net/sched/act_ct.c\n+++ b/net/sched/act_ct.c\n@@ -349,10 +349,10 @@ static int tcf_ct_flow_table_get(struct net *net, struct tcf_ct_params *params)\n \tct_ft-\u003enf_ft.type = \u0026flowtable_ct;\n \tct_ft-\u003enf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |\n \t\t\t NF_FLOWTABLE_COUNTER;\n+\twrite_pnet(\u0026ct_ft-\u003enf_ft.net, net);\n \terr = nf_flow_table_init(\u0026ct_ft-\u003enf_ft);\n \tif (err)\n \t\tgoto err_init;\n-\twrite_pnet(\u0026ct_ft-\u003enf_ft.net, net);\n \n \t__module_get(THIS_MODULE);\n out_unlock:\ndiff --git a/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c b/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c\nindex 31b8250ddc53d..0c777323f4ba7 100644\n--- a/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c\n+++ b/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c\n@@ -215,7 +215,22 @@ static int count_entries(const struct nlmsghdr *nlh, void *data)\n \treturn MNL_CB_OK;\n }\n \n-static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone)\n+static void put_zone_attr(struct nlmsghdr *nlh, uint16_t zone,\n+\t\t\t bool use_cta_filter)\n+{\n+\tstruct nlattr *nest;\n+\n+\tmnl_attr_put_u16(nlh, CTA_ZONE, htons(zone));\n+\n+\tif (use_cta_filter) {\n+\t\tnest = mnl_attr_nest_start(nlh, CTA_FILTER);\n+\t\tmnl_attr_put(nlh, CTA_FILTER_ZONE, 0, NULL);\n+\t\tmnl_attr_nest_end(nlh, nest);\n+\t}\n+}\n+\n+static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone,\n+\t\t\t\tbool use_cta_filter)\n {\n \tchar buf[MNL_SOCKET_BUFFER_SIZE];\n \tstruct nlmsghdr *nlh;\n@@ -235,7 +250,7 @@ static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone)\n \tnfh-\u003eversion = NFNETLINK_V0;\n \tnfh-\u003eres_id = 0;\n \n-\tmnl_attr_put_u16(nlh, CTA_ZONE, htons(zone));\n+\tput_zone_attr(nlh, zone, use_cta_filter);\n \n \tret = mnl_socket_sendto(sock, nlh, nlh-\u003enlmsg_len);\n \tif (ret \u003c 0) {\n@@ -261,7 +276,8 @@ static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone)\n \treturn reply_counter;\n }\n \n-static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone)\n+static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone,\n+\t\t\t\tbool use_cta_filter)\n {\n \tchar buf[MNL_SOCKET_BUFFER_SIZE];\n \tstruct nlmsghdr *nlh;\n@@ -281,7 +297,7 @@ static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone)\n \tnfh-\u003eversion = NFNETLINK_V0;\n \tnfh-\u003eres_id = 0;\n \n-\tmnl_attr_put_u16(nlh, CTA_ZONE, htons(zone));\n+\tput_zone_attr(nlh, zone, use_cta_filter);\n \n \tret = mnl_socket_sendto(sock, nlh, nlh-\u003enlmsg_len);\n \tif (ret \u003c 0) {\n@@ -304,43 +320,40 @@ static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone)\n \treturn 0;\n }\n \n-FIXTURE(conntrack_dump_flush)\n-{\n-\tstruct mnl_socket *sock;\n-};\n-\n-FIXTURE_SETUP(conntrack_dump_flush)\n+static int conntrack_zone_setup(struct __test_metadata *_metadata,\n+\t\t\t\tstruct mnl_socket **sock)\n {\n \tstruct in6_addr src, dst;\n \tint ret;\n \n-\tself-\u003esock = mnl_socket_open(NETLINK_NETFILTER);\n-\tif (!self-\u003esock) {\n+\t*sock = mnl_socket_open(NETLINK_NETFILTER);\n+\tif (!*sock) {\n \t\tperror(\"mnl_socket_open\");\n-\t\tSKIP(return, \"cannot open netlink_netfilter socket\");\n+\t\tSKIP(return -1, \"cannot open netlink_netfilter socket\");\n \t}\n \n-\tret = mnl_socket_bind(self-\u003esock, 0, MNL_SOCKET_AUTOPID);\n-\tEXPECT_EQ(ret, 0);\n+\tret = mnl_socket_bind(*sock, 0, MNL_SOCKET_AUTOPID);\n+\tASSERT_EQ(ret, 0);\n \n-\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID);\n+\tret = conntrack_count_zone(*sock, TEST_ZONE_ID, false);\n \tif (ret \u003c 0 \u0026\u0026 errno == EPERM)\n-\t\tSKIP(return, \"Needs to be run as root\");\n+\t\tSKIP(return -1, \"Needs to be run as root\");\n \telse if (ret \u003c 0 \u0026\u0026 errno == EOPNOTSUPP)\n-\t\tSKIP(return, \"Kernel does not seem to support conntrack zones\");\n+\t\tSKIP(return -1,\n+\t\t \"Kernel does not seem to support conntrack zones\");\n \n-\tret = conntrack_data_generate_v4(self-\u003esock, 0xf0f0f0f0, 0xf1f1f1f1,\n+\tret = conntrack_data_generate_v4(*sock, 0xf0f0f0f0, 0xf1f1f1f1,\n \t\t\t\t\t TEST_ZONE_ID);\n-\tEXPECT_EQ(ret, 0);\n-\tret = conntrack_data_generate_v4(self-\u003esock, 0xf2f2f2f2, 0xf3f3f3f3,\n+\tASSERT_EQ(ret, 0);\n+\tret = conntrack_data_generate_v4(*sock, 0xf2f2f2f2, 0xf3f3f3f3,\n \t\t\t\t\t TEST_ZONE_ID + 1);\n-\tEXPECT_EQ(ret, 0);\n-\tret = conntrack_data_generate_v4(self-\u003esock, 0xf4f4f4f4, 0xf5f5f5f5,\n+\tASSERT_EQ(ret, 0);\n+\tret = conntrack_data_generate_v4(*sock, 0xf4f4f4f4, 0xf5f5f5f5,\n \t\t\t\t\t TEST_ZONE_ID + 2);\n-\tEXPECT_EQ(ret, 0);\n-\tret = conntrack_data_generate_v4(self-\u003esock, 0xf6f6f6f6, 0xf7f7f7f7,\n+\tASSERT_EQ(ret, 0);\n+\tret = conntrack_data_generate_v4(*sock, 0xf6f6f6f6, 0xf7f7f7f7,\n \t\t\t\t\t NF_CT_DEFAULT_ZONE_ID);\n-\tEXPECT_EQ(ret, 0);\n+\tASSERT_EQ(ret, 0);\n \n \tsrc = (struct in6_addr) {{\n \t\t.__u6_addr32 = {\n@@ -358,9 +371,9 @@ FIXTURE_SETUP(conntrack_dump_flush)\n \t\t\t0x02000000\n \t\t}\n \t}};\n-\tret = conntrack_data_generate_v6(self-\u003esock, src, dst,\n+\tret = conntrack_data_generate_v6(*sock, src, dst,\n \t\t\t\t\t TEST_ZONE_ID);\n-\tEXPECT_EQ(ret, 0);\n+\tASSERT_EQ(ret, 0);\n \tsrc = (struct in6_addr) {{\n \t\t.__u6_addr32 = {\n \t\t\t0xb80d0120,\n@@ -377,9 +390,9 @@ FIXTURE_SETUP(conntrack_dump_flush)\n \t\t\t0x04000000\n \t\t}\n \t}};\n-\tret = conntrack_data_generate_v6(self-\u003esock, src, dst,\n+\tret = conntrack_data_generate_v6(*sock, src, dst,\n \t\t\t\t\t TEST_ZONE_ID + 1);\n-\tEXPECT_EQ(ret, 0);\n+\tASSERT_EQ(ret, 0);\n \tsrc = (struct in6_addr) {{\n \t\t.__u6_addr32 = {\n \t\t\t0xb80d0120,\n@@ -396,9 +409,9 @@ FIXTURE_SETUP(conntrack_dump_flush)\n \t\t\t0x06000000\n \t\t}\n \t}};\n-\tret = conntrack_data_generate_v6(self-\u003esock, src, dst,\n+\tret = conntrack_data_generate_v6(*sock, src, dst,\n \t\t\t\t\t TEST_ZONE_ID + 2);\n-\tEXPECT_EQ(ret, 0);\n+\tASSERT_EQ(ret, 0);\n \n \tsrc = (struct in6_addr) {{\n \t\t.__u6_addr32 = {\n@@ -416,14 +429,51 @@ FIXTURE_SETUP(conntrack_dump_flush)\n \t\t\t0x08000000\n \t\t}\n \t}};\n-\tret = conntrack_data_generate_v6(self-\u003esock, src, dst,\n+\tret = conntrack_data_generate_v6(*sock, src, dst,\n \t\t\t\t\t NF_CT_DEFAULT_ZONE_ID);\n-\tEXPECT_EQ(ret, 0);\n+\tASSERT_EQ(ret, 0);\n \n-\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID);\n+\treturn 0;\n+}\n+\n+FIXTURE(conntrack_dump_flush)\n+{\n+\tstruct mnl_socket *sock;\n+};\n+\n+FIXTURE_VARIANT(conntrack_dump_flush)\n+{\n+\tbool use_cta_filter;\n+};\n+\n+FIXTURE_VARIANT_ADD(conntrack_dump_flush, cta_zone)\n+{\n+\t.use_cta_filter = false,\n+};\n+\n+FIXTURE_VARIANT_ADD(conntrack_dump_flush, cta_filter)\n+{\n+\t.use_cta_filter = true,\n+};\n+\n+FIXTURE_SETUP(conntrack_dump_flush)\n+{\n+\tint ret;\n+\n+\tif (conntrack_zone_setup(_metadata, \u0026self-\u003esock))\n+\t\treturn;\n+\n+\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID, false);\n \tEXPECT_GE(ret, 2);\n \tif (ret \u003e 2)\n \t\tSKIP(return, \"kernel does not support filtering by zone\");\n+\n+\tif (variant-\u003euse_cta_filter) {\n+\t\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID, true);\n+\t\tif (ret \u003c 0 \u0026\u0026 errno == EINVAL)\n+\t\t\tSKIP(return, \"kernel does not support CTA_FILTER_ZONE\");\n+\t\tASSERT_GE(ret, 0);\n+\t}\n }\n \n FIXTURE_TEARDOWN(conntrack_dump_flush)\n@@ -434,39 +484,42 @@ TEST_F(conntrack_dump_flush, test_dump_by_zone)\n {\n \tint ret;\n \n-\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID);\n+\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID,\n+\t\t\t\t variant-\u003euse_cta_filter);\n \tEXPECT_EQ(ret, 2);\n }\n \n TEST_F(conntrack_dump_flush, test_flush_by_zone)\n {\n+\tbool filter = variant-\u003euse_cta_filter;\n \tint ret;\n \n-\tret = conntrack_flush_zone(self-\u003esock, TEST_ZONE_ID);\n+\tret = conntrack_flush_zone(self-\u003esock, TEST_ZONE_ID, filter);\n \tEXPECT_EQ(ret, 0);\n-\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID);\n+\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID, filter);\n \tEXPECT_EQ(ret, 0);\n-\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID + 1);\n+\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID + 1, filter);\n \tEXPECT_EQ(ret, 2);\n-\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID + 2);\n+\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID + 2, filter);\n \tEXPECT_EQ(ret, 2);\n-\tret = conntrack_count_zone(self-\u003esock, NF_CT_DEFAULT_ZONE_ID);\n+\tret = conntrack_count_zone(self-\u003esock, NF_CT_DEFAULT_ZONE_ID, filter);\n \tEXPECT_EQ(ret, 2);\n }\n \n TEST_F(conntrack_dump_flush, test_flush_by_zone_default)\n {\n+\tbool filter = variant-\u003euse_cta_filter;\n \tint ret;\n \n-\tret = conntrack_flush_zone(self-\u003esock, NF_CT_DEFAULT_ZONE_ID);\n+\tret = conntrack_flush_zone(self-\u003esock, NF_CT_DEFAULT_ZONE_ID, filter);\n \tEXPECT_EQ(ret, 0);\n-\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID);\n+\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID, filter);\n \tEXPECT_EQ(ret, 2);\n-\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID + 1);\n+\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID + 1, filter);\n \tEXPECT_EQ(ret, 2);\n-\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID + 2);\n+\tret = conntrack_count_zone(self-\u003esock, TEST_ZONE_ID + 2, filter);\n \tEXPECT_EQ(ret, 2);\n-\tret = conntrack_count_zone(self-\u003esock, NF_CT_DEFAULT_ZONE_ID);\n+\tret = conntrack_count_zone(self-\u003esock, NF_CT_DEFAULT_ZONE_ID, filter);\n \tEXPECT_EQ(ret, 0);\n }\n \ndiff --git a/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh b/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh\nindex c63d840ead61f..f63b7f12b36ab 100755\n--- a/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh\n+++ b/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh\n@@ -171,7 +171,7 @@ table inet filter {\n }\n EOF\n \n-# make sure NAT core rewrites adress of icmp error if nat is used according to\n+# make sure NAT core rewrites address of icmp error if nat is used according to\n # conntrack nat information (icmp error will be directed at nsrouter1 address,\n # but it needs to be routed to nsclient1 address).\n ip netns exec \"$nsrouter1\" nft -f - \u003c\u003cEOF\n"
} |
| 2/1 | 2026/09/29 01:14 | agent | patch-evaluator |
1mModel:core Args: null Results: {
"EnableConfigs": [
"NETFILTER_NETLINK_HOOK",
"NF_TABLES",
"NF_CT_NETLINK",
"NF_CONNTRACK",
"NF_FLOW_TABLE",
"NET_ACT_CT",
"NFT_SYNPROXY",
"NF_NAT"
],
"FocusSymbols": [
"nfnl_hook_dump",
"nfnl_hook_dump_nat",
"ctnetlink_alloc_filter",
"ctnetlink_filter_match_tuple",
"nf_ct_seqadj_reset",
"ipv4_synproxy_hook",
"ipv6_synproxy_hook",
"nf_flow_table_cleanup",
"tcf_ct_flow_table_get"
],
"Reasoning": "The patch series touches reachable executable code in core networking and Netfilter subsystems:\n1. Concurrency handling in Netfilter base hook dumps over nfnetlink is refactored with base sequence tracking (net/netfilter/nfnetlink_hook.c, core.c, nf_nat_core.c).\n2. Conntrack netlink filtering gains support for CTA_FILTER_ZONE and fixes an IPv6 comparison bug in tuple matching (net/netfilter/nf_conntrack_netlink.c).\n3. Conntrack sequence adjustment adds nf_ct_seqadj_reset used by synproxy upon reopening connections (net/netfilter/nf_conntrack_seqadj.c, nf_synproxy_core.c).\n4. Flowtable netns cleanup and tc act_ct flowtable initialization ordering are corrected (net/netfilter/nf_flow_table_core.c, net/sched/act_ct.c).\nThese changes are reachable via Netlink sockets, network packet processing, and tc actions without requiring specialized hardware.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.
IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.
================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.
- REACHABILITY IS THE PRIMARY GATE:
Fuzzing can only discover bugs in code that can actually execute in standard virtualized
environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
regardless of whether it adds assertions or complex logic.
- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
Patch authors routinely label changes as "cleanups", "refactorings", or state
"No functional change intended". Do NOT take these claims at face value.
Code refactorings that rearrange logic, introduce helper functions, or alter state management
in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
If reachable executable code is modified or refactored, it MUST be fuzzed.
- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
Even if the author believes the invariant always holds, fuzzing is essential to verify whether
an unusual sequence of operations can violate it.
================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:
- Non-kernel and non-executable changes:
* Modifications to Documentation/, comments, or spelling fixes.
* User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
that do not affect the compiled kernel image (vmlinux) or kernel modules.
* Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
that do not alter control flow or data structures.
* Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
* Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
* Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
physical PCI hot-unplug or manual sysfs driver unbinding.
* Code paths exclusive to architectures other than the target architecture.
================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
* Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
* Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
* Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
* Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).
================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:
- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
Do NOT list generic, ubiquitous functions called by almost every program in the corpus
(including, but not limited to: general memory allocators and deallocators, page fault
and trap handlers, or core synchronization primitives; this is not an exhaustive list).
Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
which severely dilutes fuzzing effort away from the actual changes.
- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
List functions that specifically implement the logic being added or altered, or direct API entrypoints
for the subsystem feature under review.
- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).
================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any '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: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit babef3608013320491bdd26d91a3451f630c9b0b
Author: syz-cluster <triage@syzkaller.com>
Date: Tue Sep 29 01:14:29 2026 +0000
syz-cluster: applied patch under review
diff --git a/Documentation/netlink/specs/conntrack.yaml b/Documentation/netlink/specs/conntrack.yaml
index 1d163130241a7..56c13705243b3 100644
--- a/Documentation/netlink/specs/conntrack.yaml
+++ b/Documentation/netlink/specs/conntrack.yaml
@@ -393,6 +393,12 @@ attribute-sets:
name: reply-flags
type: u32
doc: bitmask of tuple fields to filter on, reply direction
+ -
+ name: zone
+ type: flag
+ doc: >-
+ Filter on conntrack zone id; requires the top-level zone
+ (``CTA_ZONE``) attribute.
-
name: conntrack-attrs
attributes:
diff --git a/Documentation/networking/nf_conntrack-sysctl.rst b/Documentation/networking/nf_conntrack-sysctl.rst
index 35f889259fcdd..4426cce2a73f3 100644
--- a/Documentation/networking/nf_conntrack-sysctl.rst
+++ b/Documentation/networking/nf_conntrack-sysctl.rst
@@ -44,7 +44,7 @@ nf_conntrack_events - BOOLEAN
nf_conntrack_expect_max - INTEGER
Maximum size of expectation table. Default value is
- nf_conntrack_buckets / 256. Minimum is 1.
+ nf_conntrack_buckets / 64. Minimum is 1.
nf_conntrack_frag6_high_thresh - INTEGER
default 262144
diff --git a/include/net/netfilter/nf_conntrack_seqadj.h b/include/net/netfilter/nf_conntrack_seqadj.h
index 883c414b768ee..0f5bbb14a25aa 100644
--- a/include/net/netfilter/nf_conntrack_seqadj.h
+++ b/include/net/netfilter/nf_conntrack_seqadj.h
@@ -33,6 +33,7 @@ static inline struct nf_conn_seqadj *nfct_seqadj_ext_add(struct nf_conn *ct)
int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
s32 off);
+void nf_ct_seqadj_reset(struct nf_conn *ct, enum ip_conntrack_info ctinfo);
int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
__be32 seq, s32 off);
void nf_ct_tcp_seqadj_set(struct sk_buff *skb, struct nf_conn *ct,
diff --git a/include/net/netns/netfilter.h b/include/net/netns/netfilter.h
index a6a0bf4a247e5..7fd78394d1e7b 100644
--- a/include/net/netns/netfilter.h
+++ b/include/net/netns/netfilter.h
@@ -33,5 +33,7 @@ struct netns_nf {
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
unsigned int defrag_ipv6_users;
#endif
+ unsigned int hook_base_seq;
+ unsigned int nat_hook_base_seq;
};
#endif
diff --git a/include/uapi/linux/netfilter/nfnetlink_conntrack.h b/include/uapi/linux/netfilter/nfnetlink_conntrack.h
index 43233af75b9d5..985f9c08d3e9b 100644
--- a/include/uapi/linux/netfilter/nfnetlink_conntrack.h
+++ b/include/uapi/linux/netfilter/nfnetlink_conntrack.h
@@ -285,6 +285,7 @@ enum ctattr_filter {
CTA_FILTER_UNSPEC,
CTA_FILTER_ORIG_FLAGS,
CTA_FILTER_REPLY_FLAGS,
+ CTA_FILTER_ZONE,
__CTA_FILTER_MAX
};
#define CTA_FILTER_MAX (__CTA_FILTER_MAX - 1)
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index db307fa49f3f6..cf747e1e17a36 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -58,7 +58,7 @@ static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
/*
* Unfortunately, _b and _mask are not aligned to an int (or long int)
* Some arches dont care, unrolling the loop is a win on them.
- * For other arches, we only have a 16bit alignement.
+ * For other arches, we only have a 16bit alignment.
*/
static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
{
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 675a1034b3400..940dea2663e95 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -386,6 +386,15 @@ static void nf_static_key_dec(const struct nf_hook_ops *reg, int pf)
#endif
}
+static void bump_hook_base_seq(struct net *net)
+{
+ unsigned int base_seq = READ_ONCE(net->nf.hook_base_seq);
+
+ while (++base_seq == 0)
+ ;
+ smp_store_release(&net->nf.hook_base_seq, base_seq);
+}
+
static int __nf_register_net_hook(struct net *net, int pf,
const struct nf_hook_ops *reg)
{
@@ -430,6 +439,7 @@ static int __nf_register_net_hook(struct net *net, int pf,
if (!IS_ERR(new_hooks)) {
hooks_validate(new_hooks);
rcu_assign_pointer(*pp, new_hooks);
+ bump_hook_base_seq(net);
}
mutex_unlock(&nf_hook_mutex);
@@ -483,6 +493,7 @@ static void __nf_unregister_net_hook(struct net *net, int pf,
{
struct nf_hook_entries __rcu **pp;
struct nf_hook_entries *p;
+ bool found;
pp = nf_hook_entry_head(net, pf, reg->hooknum, reg->dev);
if (!pp)
@@ -496,7 +507,8 @@ static void __nf_unregister_net_hook(struct net *net, int pf,
return;
}
- if (nf_remove_net_hook(p, reg)) {
+ found = nf_remove_net_hook(p, reg);
+ if (found) {
#ifdef CONFIG_NETFILTER_INGRESS
if (nf_ingress_hook(reg, pf))
net_dec_ingress_queue();
@@ -511,6 +523,8 @@ static void __nf_unregister_net_hook(struct net *net, int pf,
}
p = __nf_hook_entries_try_shrink(p, pp);
+ if (found)
+ bump_hook_base_seq(net);
mutex_unlock(&nf_hook_mutex);
if (!p)
return;
@@ -784,6 +798,8 @@ static int __net_init netfilter_net_init(struct net *net)
return -ENOMEM;
}
#endif
+ net->nf.hook_base_seq = 1;
+ net->nf.nat_hook_base_seq = 1;
return 0;
}
diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index 0a86a170ba906..4aeb767088cfa 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -1426,7 +1426,7 @@ static int ip_set_swap(struct sk_buff *skb, const struct nfnl_info *info,
return -IPSET_ERR_EXIST_SETNAME2;
/* Features must not change.
- * Not an artifical restriction anymore, as we must prevent
+ * Not an artificial restriction anymore, as we must prevent
* possible loops created by swapping in setlist type of sets.
*/
if (!(from->type->features == to->type->features &&
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index 5383aeafb0aed..4dacd5af65db9 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -1344,7 +1344,7 @@ static void set_mcast_pmtudisc(struct sock *sk, int val)
}
/*
- * Specifiy default interface for outgoing multicasts
+ * Specify default interface for outgoing multicasts
*/
static int set_mcast_if(struct sock *sk, struct net_device *dev)
{
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index d0d9e5ea84a09..f9b8927327ba9 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1169,7 +1169,6 @@ nf_ct_resolve_clash(struct sk_buff *skb, struct nf_conntrack_tuple_hash *h,
return ret;
drop:
- NF_CT_STAT_INC(net, drop);
NF_CT_STAT_INC(net, insert_failed);
return NF_DROP;
}
@@ -1259,7 +1258,6 @@ __nf_conntrack_confirm(struct sk_buff *skb)
if (chainlen++ > max_chainlen) {
chaintoolong:
NF_CT_STAT_INC(net, chaintoolong);
- NF_CT_STAT_INC(net, insert_failed);
ret = NF_DROP;
goto dying;
}
@@ -2067,9 +2065,10 @@ nf_conntrack_in(struct sk_buff *skb, const struct nf_hook_state *state)
if (ret == -NF_REPEAT)
goto repeat;
- NF_CT_STAT_INC_ATOMIC(state->net, invalid);
if (ret == NF_DROP)
NF_CT_STAT_INC_ATOMIC(state->net, drop);
+ else
+ NF_CT_STAT_INC_ATOMIC(state->net, invalid);
ret = -ret;
goto out;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 4e5d7c7014368..4b6abe36028e3 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -911,6 +911,7 @@ struct ctnetlink_filter {
static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
[CTA_FILTER_ORIG_FLAGS] = NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),
[CTA_FILTER_REPLY_FLAGS] = NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),
+ [CTA_FILTER_ZONE] = { .type = NLA_FLAG },
};
static int ctnetlink_parse_filter(const struct nlattr *attr,
@@ -930,6 +931,9 @@ static int ctnetlink_parse_filter(const struct nlattr *attr,
if (tb[CTA_FILTER_REPLY_FLAGS])
filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
+ if (tb[CTA_FILTER_ZONE])
+ filter->zone_filter = true;
+
return 0;
}
@@ -1006,6 +1010,7 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
if (err)
goto err_filter;
+ /* CTA_ZONE is allowed without CTA_FILTER_ZONE. */
if (cda[CTA_ZONE]) {
err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
if (err < 0)
@@ -1020,6 +1025,12 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
if (err < 0)
goto err_filter;
+ /* CTA_FILTER_ZONE cannot be set without CTA_ZONE. */
+ if (filter->zone_filter && !cda[CTA_ZONE]) {
+ err = -EINVAL;
+ goto err_filter;
+ }
+
if (filter->orig_flags) {
if (!cda[CTA_TUPLE_ORIG]) {
err = -EINVAL;
@@ -1098,13 +1109,13 @@ static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
break;
case NFPROTO_IPV6:
if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
- !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
- &ct_tuple->src.u3.in6))
+ !ipv6_addr_equal(&filter_tuple->src.u3.in6,
+ &ct_tuple->src.u3.in6))
return 0;
if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
- !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
- &ct_tuple->dst.u3.in6))
+ !ipv6_addr_equal(&filter_tuple->dst.u3.in6,
+ &ct_tuple->dst.u3.in6))
return 0;
break;
}
diff --git a/net/netfilter/nf_conntrack_seqadj.c b/net/netfilter/nf_conntrack_seqadj.c
index d75e8dafb189e..b7b166a8ad58c 100644
--- a/net/netfilter/nf_conntrack_seqadj.c
+++ b/net/netfilter/nf_conntrack_seqadj.c
@@ -31,6 +31,23 @@ int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
}
EXPORT_SYMBOL_GPL(nf_ct_seqadj_init);
+void nf_ct_seqadj_reset(struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+{
+ struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+ struct nf_ct_seqadj *this_way;
+
+ if (unlikely(!seqadj))
+ return;
+
+ spin_lock_bh(&ct->lock);
+ this_way = &seqadj->seq[dir];
+ this_way->offset_before = 0;
+ this_way->offset_after = 0;
+ spin_unlock_bh(&ct->lock);
+}
+EXPORT_SYMBOL_GPL(nf_ct_seqadj_reset);
+
int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
__be32 seq, s32 off)
{
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
index 934c6151f558b..bd8f9cf394ff1 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -737,14 +737,9 @@ static void nf_flow_table_do_cleanup(struct nf_flowtable *flow_table,
{
struct net_device *dev = data;
- if (!dev) {
- flow_offload_teardown(flow);
- return;
- }
-
- if (net_eq(nf_ct_net(flow->ct), dev_net(dev)) &&
- (flow->tuplehash[0].tuple.iifidx == dev->ifindex ||
- flow->tuplehash[1].tuple.iifidx == dev->ifindex))
+ if (!dev ||
+ flow->tuplehash[0].tuple.iifidx == dev->ifindex ||
+ flow->tuplehash[1].tuple.iifidx == dev->ifindex)
flow_offload_teardown(flow);
}
@@ -761,8 +756,10 @@ void nf_flow_table_cleanup(struct net_device *dev)
struct nf_flowtable *flowtable;
mutex_lock(&flowtable_lock);
- list_for_each_entry(flowtable, &flowtables, list)
- nf_flow_table_gc_cleanup(flowtable, dev);
+ list_for_each_entry(flowtable, &flowtables, list) {
+ if (net_eq(read_pnet(&flowtable->net), dev_net(dev)))
+ nf_flow_table_gc_cleanup(flowtable, dev);
+ }
mutex_unlock(&flowtable_lock);
}
EXPORT_SYMBOL_GPL(nf_flow_table_cleanup);
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 84f82957e66bd..5ddd5fc95b24a 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -1160,6 +1160,15 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct,
}
#endif
+static void bump_nat_hook_base_seq(struct net *net)
+{
+ unsigned int base_seq = READ_ONCE(net->nf.nat_hook_base_seq);
+
+ while (++base_seq == 0)
+ ;
+ smp_store_release(&net->nf.nat_hook_base_seq, base_seq);
+}
+
static struct nf_ct_helper_expectfn follow_master_nat = {
.name = "nat-follow-master",
.expectfn = nf_nat_follow_master,
@@ -1245,6 +1254,7 @@ int nf_nat_register_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
nat_proto_net->nat_hook_ops = nat_ops;
nat_proto_net->users++;
+ bump_nat_hook_base_seq(net);
mutex_unlock(&nf_nat_proto_mutex);
@@ -1299,6 +1309,7 @@ void nf_nat_unregister_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
goto unlock;
priv = nat_ops[hooknum].priv;
nf_hook_entries_delete_raw(&priv->entries, ops);
+ bump_nat_hook_base_seq(net);
if (nat_proto_net->users == 0) {
nf_unregister_net_hooks(net, nat_ops, ops_count);
diff --git a/net/netfilter/nf_synproxy_core.c b/net/netfilter/nf_synproxy_core.c
index 9fc959ba20300..401ce5a13f3f4 100644
--- a/net/netfilter/nf_synproxy_core.c
+++ b/net/netfilter/nf_synproxy_core.c
@@ -686,7 +686,7 @@ ipv4_synproxy_hook(void *priv, struct sk_buff *skb,
* adjustments, they will get initialized once the connection is
* reestablished.
*/
- nf_ct_seqadj_init(ct, ctinfo, 0);
+ nf_ct_seqadj_reset(ct, ctinfo);
synproxy->tsoff = 0;
this_cpu_inc(snet->stats->conn_reopened);
fallthrough;
@@ -1116,7 +1116,7 @@ ipv6_synproxy_hook(void *priv, struct sk_buff *skb,
* adjustments, they will get initialized once the connection is
* reestablished.
*/
- nf_ct_seqadj_init(ct, ctinfo, 0);
+ nf_ct_seqadj_reset(ct, ctinfo);
synproxy->tsoff = 0;
this_cpu_inc(snet->stats->conn_reopened);
fallthrough;
diff --git a/net/netfilter/nfnetlink_hook.c b/net/netfilter/nfnetlink_hook.c
index 95005e9a60668..b05fd79397c5b 100644
--- a/net/netfilter/nfnetlink_hook.c
+++ b/net/netfilter/nfnetlink_hook.c
@@ -54,7 +54,6 @@ static int nf_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
struct nfnl_dump_hook_data {
char devname[IFNAMSIZ];
- unsigned long headv;
u8 hook;
};
@@ -338,27 +337,47 @@ nfnl_hook_entries_head(u8 pf, unsigned int hook, struct net *net, const char *de
}
static int nfnl_hook_dump_nat(struct sk_buff *nlskb,
- const struct nfnl_dump_hook_data *ctx,
- const struct nf_hook_ops *ops,
- int family, unsigned int seq)
+ struct netlink_callback *cb,
+ const struct nf_hook_ops *ops, int family)
{
struct nf_nat_lookup_hook_priv *priv = ops->priv;
- struct nf_hook_entries *e = rcu_dereference(priv->entries);
+ struct nfnl_dump_hook_data *ctx = cb->data;
+ struct net *net = sock_net(nlskb->sk);
struct nf_hook_ops **nat_ops;
- int i, err;
+ unsigned int i = cb->args[1];
+ struct nf_hook_entries *e;
+ unsigned int base_seq;
+ int err = 0;
+ base_seq = smp_load_acquire(&net->nf.nat_hook_base_seq);
+
+ e = rcu_dereference(priv->entries);
if (!e)
- return 0;
+ goto out;
nat_ops = nf_hook_entries_get_hook_ops(e);
- for (i = 0; i < e->num_hook_entries; i++) {
- err = nfnl_hook_dump_one(nlskb, ctx, nat_ops[i],
- ops->priority, family, seq);
+ for (; i < e->num_hook_entries; i++) {
+ err = nfnl_hook_dump_one(nlskb, ctx,
+ READ_ONCE(nat_ops[i]),
+ ops->priority, family,
+ cb->nlh->nlmsg_seq);
if (err)
- return err;
+ break;
+
}
- return 0;
+out:
+ if (!err)
+ i = 0;
+ cb->args[1] = i;
+
+ if (cb->args[2] && base_seq != cb->args[2]) {
+ cb->seq++;
+ err = -EINTR;
+ }
+ cb->args[2] = base_seq;
+
+ return err;
}
static int nfnl_hook_dump(struct sk_buff *nlskb,
@@ -373,35 +392,31 @@ static int nfnl_hook_dump(struct sk_buff *nlskb,
unsigned int i = cb->args[0];
rcu_read_lock();
+ cb->seq = smp_load_acquire(&net->nf.hook_base_seq);
e = nfnl_hook_entries_head(family, ctx->hook, net, ctx->devname);
- if (!e)
+ if (!e || IS_ERR(e))
goto done;
- if (IS_ERR(e)) {
- cb->seq++;
- goto done;
- }
-
- if ((unsigned long)e != ctx->headv || i >= e->num_hook_entries)
- cb->seq++;
-
ops = nf_hook_entries_get_hook_ops(e);
for (; i < e->num_hook_entries; i++) {
- if (ops[i]->hook_ops_type == NF_HOOK_OP_NAT)
- err = nfnl_hook_dump_nat(nlskb, ctx, ops[i], family,
- cb->nlh->nlmsg_seq);
- else
- err = nfnl_hook_dump_one(nlskb, ctx, ops[i],
- ops[i]->priority, family,
+ const struct nf_hook_ops *cur = READ_ONCE(ops[i]);
+
+ if (cur->hook_ops_type == NF_HOOK_OP_NAT) {
+ err = nfnl_hook_dump_nat(nlskb, cb, cur, family);
+ } else {
+ err = nfnl_hook_dump_one(nlskb, ctx, cur,
+ cur->priority, family,
cb->nlh->nlmsg_seq);
+ }
if (err)
break;
}
done:
- nl_dump_check_consistent(cb, nlmsg_hdr(nlskb));
+ if (nlskb->len > 0)
+ nl_dump_check_consistent(cb, nlmsg_hdr(nlskb));
rcu_read_unlock();
cb->args[0] = i;
return nlskb->len;
@@ -442,10 +457,7 @@ static int nfnl_hook_dump_start(struct netlink_callback *cb)
return -ENOMEM;
strscpy(ctx->devname, name, sizeof(ctx->devname));
- ctx->headv = (unsigned long)head;
ctx->hook = hooknum;
-
- cb->seq = 1;
cb->data = ctx;
return 0;
diff --git a/net/netfilter/nfnetlink_osf.c b/net/netfilter/nfnetlink_osf.c
index e4835b0f4bb1a..c8cd6af95db47 100644
--- a/net/netfilter/nfnetlink_osf.c
+++ b/net/netfilter/nfnetlink_osf.c
@@ -36,7 +36,6 @@ static inline int nf_osf_ttl(const struct sk_buff *skb,
switch (ttl_check) {
case NF_OSF_TTL_TRUE:
return ip->ttl == f_ttl;
- break;
case NF_OSF_TTL_NOCHECK:
return 1;
case NF_OSF_TTL_LESS:
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index 411e3dd92d072..e26c0d5b2176b 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -349,10 +349,10 @@ static int tcf_ct_flow_table_get(struct net *net, struct tcf_ct_params *params)
ct_ft->nf_ft.type = &flowtable_ct;
ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |
NF_FLOWTABLE_COUNTER;
+ write_pnet(&ct_ft->nf_ft.net, net);
err = nf_flow_table_init(&ct_ft->nf_ft);
if (err)
goto err_init;
- write_pnet(&ct_ft->nf_ft.net, net);
__module_get(THIS_MODULE);
out_unlock:
diff --git a/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c b/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c
index 31b8250ddc53d..0c777323f4ba7 100644
--- a/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c
+++ b/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c
@@ -215,7 +215,22 @@ static int count_entries(const struct nlmsghdr *nlh, void *data)
return MNL_CB_OK;
}
-static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone)
+static void put_zone_attr(struct nlmsghdr *nlh, uint16_t zone,
+ bool use_cta_filter)
+{
+ struct nlattr *nest;
+
+ mnl_attr_put_u16(nlh, CTA_ZONE, htons(zone));
+
+ if (use_cta_filter) {
+ nest = mnl_attr_nest_start(nlh, CTA_FILTER);
+ mnl_attr_put(nlh, CTA_FILTER_ZONE, 0, NULL);
+ mnl_attr_nest_end(nlh, nest);
+ }
+}
+
+static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone,
+ bool use_cta_filter)
{
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
@@ -235,7 +250,7 @@ static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone)
nfh->version = NFNETLINK_V0;
nfh->res_id = 0;
- mnl_attr_put_u16(nlh, CTA_ZONE, htons(zone));
+ put_zone_attr(nlh, zone, use_cta_filter);
ret = mnl_socket_sendto(sock, nlh, nlh->nlmsg_len);
if (ret < 0) {
@@ -261,7 +276,8 @@ static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone)
return reply_counter;
}
-static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone)
+static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone,
+ bool use_cta_filter)
{
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
@@ -281,7 +297,7 @@ static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone)
nfh->version = NFNETLINK_V0;
nfh->res_id = 0;
- mnl_attr_put_u16(nlh, CTA_ZONE, htons(zone));
+ put_zone_attr(nlh, zone, use_cta_filter);
ret = mnl_socket_sendto(sock, nlh, nlh->nlmsg_len);
if (ret < 0) {
@@ -304,43 +320,40 @@ static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone)
return 0;
}
-FIXTURE(conntrack_dump_flush)
-{
- struct mnl_socket *sock;
-};
-
-FIXTURE_SETUP(conntrack_dump_flush)
+static int conntrack_zone_setup(struct __test_metadata *_metadata,
+ struct mnl_socket **sock)
{
struct in6_addr src, dst;
int ret;
- self->sock = mnl_socket_open(NETLINK_NETFILTER);
- if (!self->sock) {
+ *sock = mnl_socket_open(NETLINK_NETFILTER);
+ if (!*sock) {
perror("mnl_socket_open");
- SKIP(return, "cannot open netlink_netfilter socket");
+ SKIP(return -1, "cannot open netlink_netfilter socket");
}
- ret = mnl_socket_bind(self->sock, 0, MNL_SOCKET_AUTOPID);
- EXPECT_EQ(ret, 0);
+ ret = mnl_socket_bind(*sock, 0, MNL_SOCKET_AUTOPID);
+ ASSERT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_count_zone(*sock, TEST_ZONE_ID, false);
if (ret < 0 && errno == EPERM)
- SKIP(return, "Needs to be run as root");
+ SKIP(return -1, "Needs to be run as root");
else if (ret < 0 && errno == EOPNOTSUPP)
- SKIP(return, "Kernel does not seem to support conntrack zones");
+ SKIP(return -1,
+ "Kernel does not seem to support conntrack zones");
- ret = conntrack_data_generate_v4(self->sock, 0xf0f0f0f0, 0xf1f1f1f1,
+ ret = conntrack_data_generate_v4(*sock, 0xf0f0f0f0, 0xf1f1f1f1,
TEST_ZONE_ID);
- EXPECT_EQ(ret, 0);
- ret = conntrack_data_generate_v4(self->sock, 0xf2f2f2f2, 0xf3f3f3f3,
+ ASSERT_EQ(ret, 0);
+ ret = conntrack_data_generate_v4(*sock, 0xf2f2f2f2, 0xf3f3f3f3,
TEST_ZONE_ID + 1);
- EXPECT_EQ(ret, 0);
- ret = conntrack_data_generate_v4(self->sock, 0xf4f4f4f4, 0xf5f5f5f5,
+ ASSERT_EQ(ret, 0);
+ ret = conntrack_data_generate_v4(*sock, 0xf4f4f4f4, 0xf5f5f5f5,
TEST_ZONE_ID + 2);
- EXPECT_EQ(ret, 0);
- ret = conntrack_data_generate_v4(self->sock, 0xf6f6f6f6, 0xf7f7f7f7,
+ ASSERT_EQ(ret, 0);
+ ret = conntrack_data_generate_v4(*sock, 0xf6f6f6f6, 0xf7f7f7f7,
NF_CT_DEFAULT_ZONE_ID);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
src = (struct in6_addr) {{
.__u6_addr32 = {
@@ -358,9 +371,9 @@ FIXTURE_SETUP(conntrack_dump_flush)
0x02000000
}
}};
- ret = conntrack_data_generate_v6(self->sock, src, dst,
+ ret = conntrack_data_generate_v6(*sock, src, dst,
TEST_ZONE_ID);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
src = (struct in6_addr) {{
.__u6_addr32 = {
0xb80d0120,
@@ -377,9 +390,9 @@ FIXTURE_SETUP(conntrack_dump_flush)
0x04000000
}
}};
- ret = conntrack_data_generate_v6(self->sock, src, dst,
+ ret = conntrack_data_generate_v6(*sock, src, dst,
TEST_ZONE_ID + 1);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
src = (struct in6_addr) {{
.__u6_addr32 = {
0xb80d0120,
@@ -396,9 +409,9 @@ FIXTURE_SETUP(conntrack_dump_flush)
0x06000000
}
}};
- ret = conntrack_data_generate_v6(self->sock, src, dst,
+ ret = conntrack_data_generate_v6(*sock, src, dst,
TEST_ZONE_ID + 2);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
src = (struct in6_addr) {{
.__u6_addr32 = {
@@ -416,14 +429,51 @@ FIXTURE_SETUP(conntrack_dump_flush)
0x08000000
}
}};
- ret = conntrack_data_generate_v6(self->sock, src, dst,
+ ret = conntrack_data_generate_v6(*sock, src, dst,
NF_CT_DEFAULT_ZONE_ID);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ return 0;
+}
+
+FIXTURE(conntrack_dump_flush)
+{
+ struct mnl_socket *sock;
+};
+
+FIXTURE_VARIANT(conntrack_dump_flush)
+{
+ bool use_cta_filter;
+};
+
+FIXTURE_VARIANT_ADD(conntrack_dump_flush, cta_zone)
+{
+ .use_cta_filter = false,
+};
+
+FIXTURE_VARIANT_ADD(conntrack_dump_flush, cta_filter)
+{
+ .use_cta_filter = true,
+};
+
+FIXTURE_SETUP(conntrack_dump_flush)
+{
+ int ret;
+
+ if (conntrack_zone_setup(_metadata, &self->sock))
+ return;
+
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID, false);
EXPECT_GE(ret, 2);
if (ret > 2)
SKIP(return, "kernel does not support filtering by zone");
+
+ if (variant->use_cta_filter) {
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID, true);
+ if (ret < 0 && errno == EINVAL)
+ SKIP(return, "kernel does not support CTA_FILTER_ZONE");
+ ASSERT_GE(ret, 0);
+ }
}
FIXTURE_TEARDOWN(conntrack_dump_flush)
@@ -434,39 +484,42 @@ TEST_F(conntrack_dump_flush, test_dump_by_zone)
{
int ret;
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID,
+ variant->use_cta_filter);
EXPECT_EQ(ret, 2);
}
TEST_F(conntrack_dump_flush, test_flush_by_zone)
{
+ bool filter = variant->use_cta_filter;
int ret;
- ret = conntrack_flush_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_flush_zone(self->sock, TEST_ZONE_ID, filter);
EXPECT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID, filter);
EXPECT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 1);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 1, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 2);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 2, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID, filter);
EXPECT_EQ(ret, 2);
}
TEST_F(conntrack_dump_flush, test_flush_by_zone_default)
{
+ bool filter = variant->use_cta_filter;
int ret;
- ret = conntrack_flush_zone(self->sock, NF_CT_DEFAULT_ZONE_ID);
+ ret = conntrack_flush_zone(self->sock, NF_CT_DEFAULT_ZONE_ID, filter);
EXPECT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 1);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 1, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 2);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 2, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID, filter);
EXPECT_EQ(ret, 0);
}
diff --git a/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh b/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh
index c63d840ead61f..f63b7f12b36ab 100755
--- a/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh
+++ b/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh
@@ -171,7 +171,7 @@ table inet filter {
}
EOF
-# make sure NAT core rewrites adress of icmp error if nat is used according to
+# make sure NAT core rewrites address of icmp error if nat is used according to
# conntrack nat information (icmp error will be directed at nsrouter1 address,
# but it needs to be routed to nsclient1 address).
ip netns exec "$nsrouter1" nft -f - <<EOF
|
| 3/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 14657 output: 32 thoughts: 1346 Thoughts: **Patch Series Analysis and Fuzzing Strategy** Okay, let's break down this patch series and determine the best fuzzing strategy. I've got a good grasp of the changes, but let's articulate my thoughts methodically. First, the patch series modifies several netfilter components. A doc update for the zone flag, nf_conntrack_expect_max default value, seqadj reset functions, hook base sequence updates, netlink filter changes (including a critical fix from `ipv6_addr_cmp` to `ipv6_addr_equal`), several typo fixes (always welcome), conntrack stats adjustments, flow table cleanup modifications, NAT hook sequence bumps, synproxy interactions with seqadj, refactored hook dump concurrency, a removed `break`, and a crucial re-ordering in `act_ct.c`. Additionally, selftests updates. The core areas touched are: netfilter hook dumping and sequence tracking (crucial for concurrency, with `hook_base_seq`, `nat_hook_base_seq`, and `READ_ONCE` used), conntrack netlink filtering, conntrack sequence adjustment, flow table cleanup, and the interaction between the flow table and the `act_ct` module. This is all deeply intertwined with core networking subsystems, specifically focusing on how netlink sockets (NETLINK_NETFILTER) and network packets are processed. Given these modifications, fuzzing seems highly warranted. These are core components: networking, netlink, netfilter, and hook registration, all intertwined with conntrack and `act_ct`. The changes are broad enough that a fuzzing campaign could uncover vulnerabilities. The netlink component is particularly interesting given its direct exposure. Now, I need to check the configurations required for building and the focus symbols. I will run a grepper or inspect the changed files to determine the functions that have been modified or exercise the logic that's been modified, for a more targeted fuzzing effort. |
| 4/2 | 2026/09/29 01:14 | tool | grepper |
0mError:no matches Args: {
"Expression": "config NF_CONNTRACK_NETLINK",
"PathPrefix": "net/netfilter"
}Results: {
"error": "no matches"
} |
| 5/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 16461 output: 29 thoughts: 11 Thoughts: Okay, here's my attempt at summarizing that thought process, tailored for an expert audience: **Kconfig Archaeology: Locating the Relevant Features** Alright, time to get digging. I need to figure out the specific Kconfig entries that control these features. No point in blindly poking around the kernel configuration – I need to be targeted. Let's see... what keywords are most relevant? I'll probably start with the most obvious and then work my way through more specific options if necessary. I'm thinking about the standard naming conventions, what the development community would likely use, and any obvious abstraction layers. Hopefully, I can pinpoint the relevant symbols quickly; otherwise, this could be a deep dive into the configuration system! My goal is to quickly pinpoint the appropriate Kconfig options to enable or disable the features. |
| 6/2 | 2026/09/29 01:14 | tool | grepper |
0mArgs:{
"Expression": "nfnetlink_hook",
"PathPrefix": "net/netfilter"
}Results: {
"Output": "net/netfilter/Makefile=30=obj-$(CONFIG_NETFILTER_NETLINK_OSF) += nfnetlink_osf.o\nnet/netfilter/Makefile:31:obj-$(CONFIG_NETFILTER_NETLINK_HOOK) += nfnetlink_hook.o\nnet/netfilter/Makefile-32-\n--\nnet/netfilter/nfnetlink_hook.c-20-#include \u003clinux/netfilter/nfnetlink.h\u003e\nnet/netfilter/nfnetlink_hook.c:21:#include \u003clinux/netfilter/nfnetlink_hook.h\u003e\nnet/netfilter/nfnetlink_hook.c-22-\n--\nnet/netfilter/nfnetlink_hook.c=510=MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_HOOK);\nnet/netfilter/nfnetlink_hook.c-511-\nnet/netfilter/nfnetlink_hook.c:512:static int __init nfnetlink_hook_init(void)\nnet/netfilter/nfnetlink_hook.c-513-{\n--\nnet/netfilter/nfnetlink_hook.c-516-\nnet/netfilter/nfnetlink_hook.c:517:static void __exit nfnetlink_hook_exit(void)\nnet/netfilter/nfnetlink_hook.c-518-{\n--\nnet/netfilter/nfnetlink_hook.c-521-\nnet/netfilter/nfnetlink_hook.c:522:module_init(nfnetlink_hook_init);\nnet/netfilter/nfnetlink_hook.c:523:module_exit(nfnetlink_hook_exit);\nnet/netfilter/nfnetlink_hook.c-524-\n--\nnet/netfilter/nfnetlink_hook.c=526=MODULE_AUTHOR(\"Florian Westphal \u003cfw@strlen.de\u003e\");\nnet/netfilter/nfnetlink_hook.c:527:MODULE_DESCRIPTION(\"nfnetlink_hook: list registered netfilter hooks\");\n"
} |
| 7/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 17184 output: 64 thoughts: 92 Thoughts: Okay, let's see what we have here. **Investigating Netfilter Configuration** Right, so I need to understand the configuration dependencies for these Netfilter modules. My initial thought is to examine the `Makefile` within the `net/netfilter` directory. That's the logical place to start – it should outline the relevant build configurations and dependencies for this set of modified files. Specifically, I'm interested in how these are built and linked together: * `nf_conntrack_netlink.o` * `nf_conntrack_seqadj.o` * `nf_synproxy_core.o` * `nf_flow_table_core.o` Plus, I need to check how the module `act_ct.o` in `net/sched` fits in to the picture. And I mustn't forget about how `core.c` in `net/netfilter` plays a part in all this. Hopefully, the `Makefile` will provide the necessary details on any shared objects, dependencies, and compilation flags I'll need to consider. |
| 8/2 | 2026/09/29 01:14 | tool | grepper |
0mArgs:{
"Expression": "nf_conntrack_netlink\\.o|nf_conntrack_seqadj\\.o|nf_synproxy_core\\.o|nf_flow_table\\.o",
"PathPrefix": "net/netfilter/Makefile"
}Results: {
"Output": "net/netfilter/Makefile=5=nf_conntrack-y\t:= nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_expect.o nf_conntrack_helper.o \\\n--\nnet/netfilter/Makefile-7-\t\t nf_conntrack_proto_icmp.o \\\nnet/netfilter/Makefile:8:\t\t nf_conntrack_extend.o nf_conntrack_acct.o nf_conntrack_seqadj.o\nnet/netfilter/Makefile-9-\n--\nnet/netfilter/Makefile=34=obj-$(CONFIG_NF_CONNTRACK) += nf_conntrack.o\n--\nnet/netfilter/Makefile-36-# netlink interface for nf_conntrack\nnet/netfilter/Makefile:37:obj-$(CONFIG_NF_CT_NETLINK) += nf_conntrack_netlink.o\nnet/netfilter/Makefile-38-obj-$(CONFIG_NF_CT_NETLINK_TIMEOUT) += nfnetlink_cttimeout.o\n--\nnet/netfilter/Makefile=76=obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o\n--\nnet/netfilter/Makefile-78-# SYNPROXY\nnet/netfilter/Makefile:79:obj-$(CONFIG_NETFILTER_SYNPROXY) += nf_synproxy_core.o\nnet/netfilter/Makefile-80-\n--\nnet/netfilter/Makefile=139=obj-$(CONFIG_NFT_FWD_NETDEV)\t+= nft_fwd_netdev.o\n--\nnet/netfilter/Makefile-141-# flow table infrastructure\nnet/netfilter/Makefile:142:obj-$(CONFIG_NF_FLOW_TABLE)\t+= nf_flow_table.o\nnet/netfilter/Makefile-143-nf_flow_table-objs\t\t:= nf_flow_table_core.o nf_flow_table_ip.o \\\n"
} |
| 9/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18062 output: 30 thoughts: 19 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Investigating the Act_CT Module** Alright, time to dive in. My initial thought process is straightforward: I need to quickly establish the build location for `act_ct.o`. Given that it's a traffic control (TC) action module, my first instinct, and the most logical place to start digging, is the `net/sched` directory. I'll need to confirm its presence and understand how it's integrated within the existing build system. So, I'm heading straight for the `Makefile` in that directory. Let's see what we can find. This should give me the base build instructions and likely, the dependencies. |
| 10/2 | 2026/09/29 01:14 | tool | grepper |
0mArgs:{
"Expression": "act_ct\\.o",
"PathPrefix": "net/sched/Makefile"
}Results: {
"Output": "net/sched/Makefile=31=obj-$(CONFIG_NET_ACT_TUNNEL_KEY)+= act_tunnel_key.o\nnet/sched/Makefile:32:obj-$(CONFIG_NET_ACT_CT)\t+= act_ct.o\nnet/sched/Makefile-33-obj-$(CONFIG_NET_ACT_GATE)\t+= act_gate.o\n"
} |
| 11/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18366 output: 29 thoughts: 18 Thoughts: Here's a summary of my thought process: **Diving into the Netfilter Makefile for Core Functionality** Okay, so I need to understand how this netfilter module is built. My first instinct is to look at the `Makefile` itself, specifically the one within the `net/netfilter` directory. That's usually where the build configuration lives. I'm focusing on the `core.c` file; that's probably where the main logic or initialization stuff is, and I want to see how that's handled. I'm expecting to find object file dependencies, include paths, maybe some compilation flags specific to this core module... essentially, the recipe for building `core.o`. Hopefully, this will give me some insight into how the entire netfilter system is linked and how `core.c` fits into the puzzle. Let's see what's in there. |
| 12/2 | 2026/09/29 01:14 | tool | grepper |
0mArgs:{
"Expression": "core\\.o",
"PathPrefix": "net/netfilter/Makefile"
}Results: {
"Output": "net/netfilter/Makefile-1-# SPDX-License-Identifier: GPL-2.0\nnet/netfilter/Makefile:2:netfilter-objs := core.o nf_log.o nf_queue.o nf_sockopt.o utils.o\nnet/netfilter/Makefile-3-netfilter-$(CONFIG_NETFILTER_NETLINK) += nfnetlink.o\nnet/netfilter/Makefile-4-\nnet/netfilter/Makefile:5:nf_conntrack-y\t:= nf_conntrack_core.o nf_conntrack_standalone.o nf_conntrack_expect.o nf_conntrack_helper.o \\\nnet/netfilter/Makefile-6-\t\t nf_conntrack_proto.o nf_conntrack_proto_generic.o nf_conntrack_proto_tcp.o nf_conntrack_proto_udp.o \\\n--\nnet/netfilter/Makefile=54=obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o\nnet/netfilter/Makefile-55-\nnet/netfilter/Makefile:56:nf_nat-y\t:= nf_nat_core.o nf_nat_proto.o nf_nat_helper.o\nnet/netfilter/Makefile-57-\n--\nnet/netfilter/Makefile=76=obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o\n--\nnet/netfilter/Makefile-78-# SYNPROXY\nnet/netfilter/Makefile:79:obj-$(CONFIG_NETFILTER_SYNPROXY) += nf_synproxy_core.o\nnet/netfilter/Makefile-80-\n--\nnet/netfilter/Makefile=84=obj-$(CONFIG_NF_DUP_NETDEV)\t+= nf_dup_netdev.o\n--\nnet/netfilter/Makefile-86-# nf_tables\nnet/netfilter/Makefile:87:nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \\\nnet/netfilter/Makefile-88-\t\t nf_tables_trace.o nft_immediate.o nft_cmp.o nft_range.o \\\n--\nnet/netfilter/Makefile=142=obj-$(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"
} |
| 13/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 19232 output: 50 thoughts: 70 Thoughts: Okay, here's my thought process as I'd approach this, considering I'm deep in the weeds with networking kernel configurations: **Deep Dive into Netfilter Configuration** Alright, time to get my hands dirty. I need to make sure I understand the current Netfilter configuration. My first step is to methodically examine the `Kconfig` files. I need to verify how these specific features are defined and enabled. I'm focusing on these crucial Netfilter components: `NETFILTER_NETLINK_HOOK`, `NF_CONNTRACK`, `NF_CT_NETLINK`, `NF_NAT`, `NETFILTER_SYNPROXY`, `NF_FLOW_TABLE`, and `NET_ACT_CT`. I'll be looking for their dependencies, default values, and any relevant relationships. My goal is to get a holistic picture of their status in the build. I'll need to know which are enabled, disabled, or built as modules. A quick search through the `Kconfig` files will give me this crucial baseline information. From there, I can begin to assess any potential conflicts or areas that require tuning for optimal performance, based on the specific use case I'm working with. |
| 14/2 | 2026/09/29 01:14 | tool | grepper |
0mArgs:{
"Expression": "config (NETFILTER_NETLINK_HOOK|NET_ACT_CT|NETFILTER_SYNPROXY|NF_FLOW_TABLE)\\b",
"PathPrefix": "net"
}Results: {
"Output": "net/netfilter/Kconfig=33=config NETFILTER_BPF_LINK\n--\nnet/netfilter/Kconfig-35-\nnet/netfilter/Kconfig:36:config NETFILTER_NETLINK_HOOK\nnet/netfilter/Kconfig-37-\ttristate \"Netfilter base hook dump support\"\n--\nnet/netfilter/Kconfig=447=config NF_NAT_OVS\n--\nnet/netfilter/Kconfig-449-\nnet/netfilter/Kconfig:450:config NETFILTER_SYNPROXY\nnet/netfilter/Kconfig-451-\ttristate\n--\nnet/netfilter/Kconfig=703=config NF_FLOW_TABLE_INET\n--\nnet/netfilter/Kconfig-710-\nnet/netfilter/Kconfig:711:config NF_FLOW_TABLE\nnet/netfilter/Kconfig-712-\ttristate \"Netfilter flow table module\"\n--\nnet/sched/Kconfig=906=config NET_ACT_TUNNEL_KEY\n--\nnet/sched/Kconfig-916-\nnet/sched/Kconfig:917:config NET_ACT_CT\nnet/sched/Kconfig-918-\ttristate \"connection tracking tc action\"\n"
} |
| 15/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 19922 output: 34 thoughts: 28 Thoughts: Here's a summary of my thought process: **Diving into the Kernel Configuration for Netfilter Netlink Hooks** Okay, so I need to understand the configuration dependencies for `NETFILTER_NETLINK_HOOK`. My first thought is to dive into the Kconfig file for the netfilter subsystem, specifically `net/netfilter/Kconfig`. This file usually holds the key to how various netfilter features are enabled and what they rely on. By reading the relevant section around `NETFILTER_NETLINK_HOOK`, I should be able to quickly determine any other kernel features or settings that need to be enabled before I can leverage this netlink hook functionality. This is the starting point for understanding how to properly configure this aspect of the system. I expect to find dependencies on other network or netfilter options, and understanding these dependencies is crucial before I can proceed. |
| 16/2 | 2026/09/29 01:14 | tool | read-file |
0mArgs:{
"File": "net/netfilter/Kconfig",
"FirstLine": 35,
"LineCount": 20
}Results: {
"Contents": " 35:\t\n 36:\tconfig NETFILTER_NETLINK_HOOK\n 37:\t\ttristate \"Netfilter base hook dump support\"\n 38:\t\tdepends on NETFILTER_ADVANCED\n 39:\t\tdepends on NF_TABLES\n 40:\t\tselect NETFILTER_NETLINK\n 41:\t\thelp\n 42:\t\t If this option is enabled, the kernel will include support\n 43:\t\t to list the base netfilter hooks via NFNETLINK.\n 44:\t\t This is helpful for debugging.\n 45:\t\n 46:\tconfig NETFILTER_NETLINK_ACCT\n 47:\t\ttristate \"Netfilter NFACCT over NFNETLINK interface\"\n 48:\t\tdepends on NETFILTER_ADVANCED\n 49:\t\tselect NETFILTER_NETLINK\n 50:\t\thelp\n 51:\t\t If this option is enabled, the kernel will include support\n 52:\t\t for extended accounting via NFNETLINK.\n 53:\t\n 54:\tconfig NETFILTER_NETLINK_QUEUE\n"
} |
| 17/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 20431 output: 35 thoughts: 21 Thoughts: Here's my thought process, as requested: **Checking `NETFILTER_SYNPROXY` Configuration** Okay, let's dive right in. My initial thought is to confirm the `NETFILTER_SYNPROXY` configuration. This is standard procedure for me, whenever dealing with SYN proxy or any related network security feature within the Linux kernel. I'll need to double-check this is enabled, and understand its implications within the context of the build. I'll start by navigating to the relevant `Kconfig` file, which I know resides within the `net/netfilter/` directory. That's the first step - making sure the feature itself is compiled in. From there, I'll need to understand how it interacts with the rest of the network stack. Specifically, I'll need to mentally trace the dependencies and potential conflicts, based on the kernel version and any custom modules or configurations involved. |
| 18/2 | 2026/09/29 01:14 | tool | read-file |
0mArgs:{
"File": "net/netfilter/Kconfig",
"FirstLine": 448,
"LineCount": 25
}Results: {
"Contents": " 448:\t\tbool\n 449:\t\n 450:\tconfig NETFILTER_SYNPROXY\n 451:\t\ttristate\n 452:\t\n 453:\tendif # NF_CONNTRACK\n 454:\t\n 455:\tconfig NF_TABLES\n 456:\t\tselect NETFILTER_NETLINK\n 457:\t\tselect NET_CRC32C\n 458:\t\ttristate \"Netfilter nf_tables support\"\n 459:\t\thelp\n 460:\t\t nftables is the new packet classification framework that intends to\n 461:\t\t replace the existing {ip,ip6,arp,eb}_tables infrastructure. It\n 462:\t\t provides a pseudo-state machine with an extensible instruction-set\n 463:\t\t (also known as expressions) that the userspace 'nft' utility\n 464:\t\t (https://www.netfilter.org/projects/nftables) uses to build the\n 465:\t\t rule-set. It also comes with the generic set infrastructure that\n 466:\t\t allows you to construct mappings between matchings and actions\n 467:\t\t for performance lookups.\n 468:\t\n 469:\t\t To compile it as a module, choose M here.\n 470:\t\n 471:\tif NF_TABLES\n 472:\tconfig NF_TABLES_INET\n"
} |
| 19/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 21043 output: 27 thoughts: 18 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Investigating the NETFILTER_SYNPROXY Dependency** Alright, NETFILTER_SYNPROXY is showing up as enabled. Now, I need to understand *why*. It's not something I typically configure directly, so something in the configuration is pulling it in. My immediate thought is, "who's the culprit?" I need to trace this back. Is it a core module, a specific network feature, or maybe even a misconfiguration somewhere? Time to dive into the Kconfig files and cross-reference dependencies. Let's see what's directly or indirectly selecting that option. I'll probably start with a `grep` and a bit of `defconfig` analysis to identify the most likely candidates. Then I'll dig a bit deeper if I need to. |
| 20/2 | 2026/09/29 01:14 | tool | grepper |
0mArgs:{
"Expression": "select NETFILTER_SYNPROXY",
"PathPrefix": "net"
}Results: {
"Output": "net/ipv4/netfilter/Kconfig=207=config IP_NF_TARGET_SYNPROXY\n--\nnet/ipv4/netfilter/Kconfig-209-\tdepends on NF_CONNTRACK \u0026\u0026 NETFILTER_ADVANCED\nnet/ipv4/netfilter/Kconfig:210:\tselect NETFILTER_SYNPROXY\nnet/ipv4/netfilter/Kconfig-211-\tselect SYN_COOKIES\n--\nnet/ipv6/netfilter/Kconfig=221=config IP6_NF_TARGET_SYNPROXY\n--\nnet/ipv6/netfilter/Kconfig-223-\tdepends on NF_CONNTRACK \u0026\u0026 NETFILTER_ADVANCED\nnet/ipv6/netfilter/Kconfig:224:\tselect NETFILTER_SYNPROXY\nnet/ipv6/netfilter/Kconfig-225-\tselect SYN_COOKIES\n--\nnet/netfilter/Kconfig=649=config NFT_SYNPROXY\n--\nnet/netfilter/Kconfig-651-\tdepends on NF_CONNTRACK \u0026\u0026 NETFILTER_ADVANCED\nnet/netfilter/Kconfig:652:\tselect NETFILTER_SYNPROXY\nnet/netfilter/Kconfig-653-\tselect SYN_COOKIES\n"
} |
| 21/2 | 2026/09/29 01:14 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 21570 output: 34 thoughts: 20 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Investigating Network Scheduler Configuration** Right, let's dive straight in. The core question seems to be around a network activity control option, so my first instinct is to zero in on `NET_ACT_CT`. That almost certainly suggests a configuration option within the Linux kernel's network scheduler framework. I need to understand its scope and implications. The logical place to start digging is the Kconfig file within the `net/sched/` directory. That's the go-to location for kernel configuration options related to networking schedulers. The `Kconfig` files are where these options are defined, along with their dependencies, descriptions, and defaults. That will give me the most fundamental information about `NET_ACT_CT`. From there, I can get a clearer understanding of what it is, when it should be enabled, and what dependencies it may have. |
| 22/2 | 2026/09/29 01:15 | tool | read-file |
0mArgs:{
"File": "net/sched/Kconfig",
"FirstLine": 915,
"LineCount": 20
}Results: {
"Contents": " 915:\t\t module will be called act_tunnel_key.\n 916:\t\n 917:\tconfig NET_ACT_CT\n 918:\t\ttristate \"connection tracking tc action\"\n 919:\t\tdepends on NET_CLS_ACT \u0026\u0026 NF_CONNTRACK \u0026\u0026 (!NF_NAT || NF_NAT) \u0026\u0026 NF_FLOW_TABLE\n 920:\t\tselect NF_CONNTRACK_OVS\n 921:\t\tselect NF_NAT_OVS if NF_NAT\n 922:\t\thelp\n 923:\t\t Say Y here to allow sending the packets to conntrack module.\n 924:\t\n 925:\t\t If unsure, say N.\n 926:\t\n 927:\t\t To compile this code as a module, choose M here: the\n 928:\t\t module will be called act_ct.\n 929:\t\n 930:\tconfig NET_ACT_GATE\n 931:\t\ttristate \"Frame gate entry list control tc action\"\n 932:\t\tdepends on NET_CLS_ACT\n 933:\t\thelp\n 934:\t\t Say Y here to allow to control the ingress flow to be passed at\n"
} |
| 23/2 | 2026/09/29 01:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22134 output: 30 thoughts: 22 Thoughts: Here's my thought process, as it went: **Examining Netfilter Configuration** Okay, I need to look into something related to netfilter, likely a configuration option. The text is pointing me directly to `NF_CT_NETLINK` within the `net/netfilter/Kconfig` file. Given my expertise, my initial thought is, "Right, this is a likely candidate for controlling a particular aspect of Netfilter's connection tracking functionality and its integration with netlink." I'll need to remember to check other potentially relevant `Kconfig` files, especially those related to connection tracking (`ct`) in the wider networking subsystem, but this is clearly the starting point. I understand this implies a compile-time configuration choice. This probably relates to whether a specific Netfilter module will support, or is built with, Netlink interface to userspace to allow it to communicate with the kernel to allow for configuration and control. My focus will be on understanding what features or modules this config option enables. I'll need to understand if the configuration option is a dependency on other features. Let's dig in and see what the file tells us. |
| 24/2 | 2026/09/29 01:15 | tool | grepper |
0mArgs:{
"Expression": "config NF_CT_NETLINK\\b",
"PathPrefix": "net"
}Results: {
"Output": "net/netfilter/Kconfig=355=config NF_CONNTRACK_TFTP\n--\nnet/netfilter/Kconfig-365-\nnet/netfilter/Kconfig:366:config NF_CT_NETLINK\nnet/netfilter/Kconfig-367-\ttristate 'Connection tracking netlink interface'\n"
} |
| 25/2 | 2026/09/29 01:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22517 output: 39 thoughts: 1678 Thoughts: **Analysis of Netfilter Patch for FocusSymbols** Okay, so I've got this patch in front of me, and my immediate focus is on identifying the *exact* changes and, more importantly, the functions that are either new, altered, or represent direct API entry points suitable for FocusSymbols. My goal here is to zero in on the relevant code for concentrated fuzzing. First, I've got a comprehensive list of files and affected functions. Looks like a good chunk of core Netfilter is touched: `net/netfilter/core.c`, `nf_conntrack_core.c`, `nf_conntrack_netlink.c`, `nf_conntrack_seqadj.c`, `nf_synproxy_core.c`, `nf_flow_table_core.c`, `nf_nat_core.c`, `nfnetlink_hook.c`, and `net/sched/act_ct.c`. I need to quickly understand the *reachability* of these functions. Looks like some are exposed via Netlink, which is ideal since userspace interaction is directly possible for fuzzing without special hardware. * `net/netfilter/core.c` has `bump_hook_base_seq`, `__nf_register_net_hook`, `__nf_unregister_net_hook`, `netfilter_net_init`. * `net/netfilter/nf_conntrack_core.c` has `nf_ct_resolve_clash`, `__nf_conntrack_confirm`, `nf_conntrack_in`. * `net/netfilter/nf_conntrack_netlink.c` has `cta_filter_nla_policy`, `ctnetlink_parse_filter`, `ctnetlink_alloc_filter`, `ctnetlink_filter_match_tuple`. * `net/netfilter/nf_conntrack_seqadj.c` has `nf_ct_seqadj_reset` (new!). * `net/netfilter/nf_synproxy_core.c` has `ipv4_synproxy_hook`, `ipv6_synproxy_hook`. * `net/netfilter/nf_flow_table_core.c` has `nf_flow_table_do_cleanup`, `nf_flow_table_cleanup`. * `net/netfilter/nf_nat_core.c` has `bump_nat_hook_base_seq`, `nf_nat_register_fn`, `nf_nat_unregister_fn`. * `net/netfilter/nfnetlink_hook.c` has `nfnl_hook_dump_nat`, `nfnl_hook_dump`, `nfnl_hook_dump_start`. * `net/sched/act_ct.c` has `tcf_ct_flow_table_get`. Now, let's connect the dots and explore reachability from userspace: * The Netlink hook dumping (`nfnl_hook_dump*`) is *key* here. It's explicitly designed to be accessed via netlink (`NFNL_MSG_HOOK_GET`). This is where the patch introduces concurrency handling with `hook_base_seq` and `nat_hook_base_seq`. I can target race conditions here! It looks like there is a new check for sequence numbers, `-EINTR` handling, and `cb->seq++`. This is prime territory. * Conntrack Netlink dumping/filtering (`ctnetlink_*`) is also directly fuzzable. The patch adds support for `CTA_FILTER_ZONE` and fixes an IPv6 address filtering issue. * `nf_ct_seqadj_reset` is interesting because it replaces `nf_ct_seqadj_init` during connection re-establishment in SYNPROXY. I should verify this function's scope of influence and relevance. * The Flowtable and `act_ct.c` changes look to be a race condition fix. I see net namespace checks added to prevent an uninitialized flowtable race, which also looks very interesting for concurrency. * `nf_conntrack_in`, `nf_ct_resolve_clash`, and `__nf_conntrack_confirm` are related to stats counters. I need to be sure they are relevant. So far, my hit list for interesting areas that can be fuzzed from user space directly includes netlink and concurrency: 1. `nfnetlink_hook.c` (hook dumping): Specifically, the changes around `hook_base_seq`, and `nat_hook_base_seq` and all the functions that use them. |
| 26/2 | 2026/09/29 01:15 | tool | grepper |
0mArgs:{
"Expression": "nfnl_hook_dump",
"PathPrefix": "net/netfilter/nfnetlink_hook.c"
}Results: {
"Output": "net/netfilter/nfnetlink_hook.c=158=static int nfnl_hook_put_nft_ft_info(struct sk_buff *nlskb,\n--\nnet/netfilter/nfnetlink_hook.c-189-\nnet/netfilter/nfnetlink_hook.c:190:static int nfnl_hook_dump_one(struct sk_buff *nlskb,\nnet/netfilter/nfnetlink_hook.c-191-\t\t\t const struct nfnl_dump_hook_data *ctx,\n--\nnet/netfilter/nfnetlink_hook.c=278=nfnl_hook_entries_head(u8 pf, unsigned int hook, struct net *net, const char *dev)\n--\nnet/netfilter/nfnetlink_hook.c-338-\nnet/netfilter/nfnetlink_hook.c:339:static int nfnl_hook_dump_nat(struct sk_buff *nlskb,\nnet/netfilter/nfnetlink_hook.c-340-\t\t\t struct netlink_callback *cb,\n--\nnet/netfilter/nfnetlink_hook.c-360-\tfor (; i \u003c e-\u003enum_hook_entries; i++) {\nnet/netfilter/nfnetlink_hook.c:361:\t\terr = nfnl_hook_dump_one(nlskb, ctx,\nnet/netfilter/nfnetlink_hook.c-362-\t\t\t\t\t READ_ONCE(nat_ops[i]),\n--\nnet/netfilter/nfnetlink_hook.c-382-\nnet/netfilter/nfnetlink_hook.c:383:static int nfnl_hook_dump(struct sk_buff *nlskb,\nnet/netfilter/nfnetlink_hook.c-384-\t\t\t struct netlink_callback *cb)\n--\nnet/netfilter/nfnetlink_hook.c-406-\t\tif (cur-\u003ehook_ops_type == NF_HOOK_OP_NAT) {\nnet/netfilter/nfnetlink_hook.c:407:\t\t\terr = nfnl_hook_dump_nat(nlskb, cb, cur, family);\nnet/netfilter/nfnetlink_hook.c-408-\t\t} else {\nnet/netfilter/nfnetlink_hook.c:409:\t\t\terr = nfnl_hook_dump_one(nlskb, ctx, cur,\nnet/netfilter/nfnetlink_hook.c-410-\t\t\t\t\t\t cur-\u003epriority, family,\n--\nnet/netfilter/nfnetlink_hook.c-424-\nnet/netfilter/nfnetlink_hook.c:425:static int nfnl_hook_dump_start(struct netlink_callback *cb)\nnet/netfilter/nfnetlink_hook.c-426-{\n--\nnet/netfilter/nfnetlink_hook.c-465-\nnet/netfilter/nfnetlink_hook.c:466:static int nfnl_hook_dump_stop(struct netlink_callback *cb)\nnet/netfilter/nfnetlink_hook.c-467-{\n--\nnet/netfilter/nfnetlink_hook.c=472=static int nfnl_hook_get(struct sk_buff *skb,\n--\nnet/netfilter/nfnetlink_hook.c-480-\t\tstruct netlink_dump_control c = {\nnet/netfilter/nfnetlink_hook.c:481:\t\t\t.start = nfnl_hook_dump_start,\nnet/netfilter/nfnetlink_hook.c:482:\t\t\t.done = nfnl_hook_dump_stop,\nnet/netfilter/nfnetlink_hook.c:483:\t\t\t.dump = nfnl_hook_dump,\nnet/netfilter/nfnetlink_hook.c-484-\t\t\t.module = THIS_MODULE,\n"
} |
| 27/2 | 2026/09/29 01:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 26238 output: 42 thoughts: 81 Thoughts: Okay, here's my interpretation of that quick mental scan, tailored for someone in the field: **Internal Netfilter Code Navigation** Right, so I'm mentally tracing through some Netfilter code. I've got my bearings – `nfnetlink_hook.c` holds the `nfnl_hook_get`, `nfnl_hook_dump`, `nfnl_hook_dump_nat`, and `nfnl_hook_dump_start` functions. Pretty standard hook management stuff there, likely responsible for registering and managing Netfilter hooks, and providing the mechanisms for dumping their state. Now, I'm shifting focus over to `nf_conntrack_netlink.c`. I need to figure out how a specific allocation function is used. So, I need to see what's actually *calling* `ctnetlink_alloc_filter`. Knowing how and where it’s called will provide useful context about how connection tracking filters are created and managed within the Netlink framework. Let’s see what the call sites reveal about the function’s purpose. |
| 28/2 | 2026/09/29 01:15 | tool | grepper |
0mArgs:{
"Expression": "ctnetlink_alloc_filter",
"PathPrefix": "net/netfilter/nf_conntrack_netlink.c"
}Results: {
"Output": "net/netfilter/nf_conntrack_netlink.c=988=static struct ctnetlink_filter *\nnet/netfilter/nf_conntrack_netlink.c:989:ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)\nnet/netfilter/nf_conntrack_netlink.c-990-{\n--\nnet/netfilter/nf_conntrack_netlink.c=1077=static int ctnetlink_start(struct netlink_callback *cb)\n--\nnet/netfilter/nf_conntrack_netlink.c-1084-\tif (ctnetlink_needs_filter(family, cda)) {\nnet/netfilter/nf_conntrack_netlink.c:1085:\t\tfilter = ctnetlink_alloc_filter(cda, family);\nnet/netfilter/nf_conntrack_netlink.c-1086-\t\tif (IS_ERR(filter))\n--\nnet/netfilter/nf_conntrack_netlink.c=1601=static int ctnetlink_flush_conntrack(struct net *net,\n--\nnet/netfilter/nf_conntrack_netlink.c-1612-\tif (ctnetlink_needs_filter(family, cda)) {\nnet/netfilter/nf_conntrack_netlink.c:1613:\t\tfilter = ctnetlink_alloc_filter(cda, family);\nnet/netfilter/nf_conntrack_netlink.c-1614-\t\tif (IS_ERR(filter))\n"
} |
| 29/2 | 2026/09/29 01:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 26997 output: 28 thoughts: 222 Thoughts: **Investigating Conntrack and Flow Table Interactions** Okay, so I'm looking into some kernel functions related to the connection tracking and flow table subsystems, specifically scattered across a few source files. I've got my bearings in `nf_conntrack_netlink.c`, noting the presence of `ctnetlink_alloc_filter`, `ctnetlink_filter_match_tuple`, and `ctnetlink_parse_filter`. But now, my attention is drawn to `nf_flow_table_cleanup` in `nf_flow_table_core.c`. Hmm, I see it's exported with `EXPORT_SYMBOL_GPL`, which is interesting. It indicates that it's designed to be used by other modules. I should also note that `nf_ct_seqadj_reset` in `nf_conntrack_seqadj.c` is also exported. And I'm seeing `ipv4_synproxy_hook` and `ipv6_synproxy_hook` from `nf_synproxy_core.c` and finally, `tcf_ct_flow_table_get` in `act_ct.c`. It feels like there's a connection here between these various functions. The fact that `nf_flow_table_cleanup` is exported specifically piqued my interest. My next step is clear. I need to trace the call graph to see precisely *who* is calling `nf_flow_table_cleanup`. Understanding the upstream users of this function will give me a better understanding of how the flow table interacts with other parts of the connection tracking infrastructure. |
| 30/2 | 2026/09/29 01:15 | tool | grepper |
0mArgs:{
"Expression": "nf_flow_table_cleanup",
"PathPrefix": "net"
}Results: {
"Output": "net/netfilter/nf_flow_table_core.c=746=void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable,\n--\nnet/netfilter/nf_flow_table_core.c-753-\nnet/netfilter/nf_flow_table_core.c:754:void nf_flow_table_cleanup(struct net_device *dev)\nnet/netfilter/nf_flow_table_core.c-755-{\n--\nnet/netfilter/nf_flow_table_core.c-764-}\nnet/netfilter/nf_flow_table_core.c:765:EXPORT_SYMBOL_GPL(nf_flow_table_cleanup);\nnet/netfilter/nf_flow_table_core.c-766-\n--\nnet/netfilter/nft_flow_offload.c=238=static int flow_offload_netdev_event(struct notifier_block *this,\n--\nnet/netfilter/nft_flow_offload.c-245-\nnet/netfilter/nft_flow_offload.c:246:\tnf_flow_table_cleanup(dev);\nnet/netfilter/nft_flow_offload.c-247-\n"
} |
| 31/2 | 2026/09/29 01:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 27907 output: 415 thoughts: 2177 Thoughts: **Analysis of Netfilter and Networking Patch for Fuzzing**
Alright, let's break this down. My goal here is to determine the optimal configuration and focus for fuzzing this netfilter and networking-related patch.
First, I need to evaluate if it's "WorthFuzzing". Based on the changes, it looks highly likely. The patch touches core areas, potentially including concurrency in dumping, updates to netlink filtering, conntrack, SYNPROXY hooks, and flowtable/tc interactions. These are all critical paths within the kernel's network stack and can be reached through standard interfaces, so: "WorthFuzzing: true."
Now, to target the fuzzing effectively, I need a good list of "FocusSymbols." I've identified these key functions based on the code modifications and entry points within the patch:
* `nfnl_hook_dump`
* `nfnl_hook_dump_nat`
* `ctnetlink_alloc_filter`
* `ctnetlink_filter_match_tuple`
* `nf_ct_seqadj_reset`
* `ipv4_synproxy_hook`
* `ipv6_synproxy_hook`
* `nf_flow_table_cleanup`
* `tcf_ct_flow_table_get`
I've made sure to eliminate functions that would likely be too ubiquitous to provide value (memory allocators, etc.). These functions seem to be directly related to the changes made and represent good starting points for fuzzing. Also added `ctnetlink_parse_filter` and `nfnl_hook_dump_start` to the list.
Next, I need to determine the necessary kernel configurations ("EnableConfigs"). The code depends on several netfilter modules and features. Based on my review, the following configurations are crucial:
* `NETFILTER_NETLINK_HOOK` - This is definitely needed for netlink hook dump functionality. And needs `NF_TABLES` and `NETFILTER_ADVANCED`
* `NF_TABLES` - base for `NETFILTER_NETLINK_HOOK` and needed by NFT
* `NF_CT_NETLINK` - This enables the connection tracking netlink interface. It also depends on `NF_CONNTRACK`.
* `NF_CONNTRACK` - Connection tracking core, seems a must.
* `NF_FLOW_TABLE` - Needed for flowtable related operations.
* `NET_ACT_CT` - Needed for tc `act_ct` action.
* `NFT_SYNPROXY` - Since the patch references SYNPROXY, this should be selected. Also `NF_CONNTRACK` and `NETFILTER_ADVANCED` are required. Alternatively, `IP_NF_TARGET_SYNPROXY` or `IP6_NF_TARGET_SYNPROXY`. Also `NF_TABLES`
* `NF_NAT` - For network address translation (NAT) functionality.
I've ensured to identify and include all dependencies. For `NETFILTER_SYNPROXY` specifically, I need to make sure either `NFT_SYNPROXY` or `IP_NF_TARGET_SYNPROXY` or `IP6_NF_TARGET_SYNPROXY` is selected since it has no prompt string of its own.
Now I can provide a comprehensive list to `set-results`:
* `WorthFuzzing`: true
* `FocusSymbols`:
* `nfnl_hook_dump`
* `nfnl_hook_dump_nat`
* `ctnetlink_alloc_filter`
* `ctnetlink_filter_match_tuple`
* `nf_ct_seqadj_reset`
* `ipv4_synproxy_hook`
* `ipv6_synproxy_hook`
* `nf_flow_table_cleanup`
* `tcf_ct_flow_table_get`
* `ctnetlink_parse_filter`
* `nfnl_hook_dump_start`
* `EnableConfigs`:
* `NETFILTER_NETLINK_HOOK`
* `NF_TABLES`
* `NF_CT_NETLINK`
* `NF_CONNTRACK`
* `NF_FLOW_TABLE`
* `NET_ACT_CT`
* `NFT_SYNPROXY`
* `NF_NAT`
Okay, now let's call `set-results` and proceed.
|
| 32/2 | 2026/09/29 01:15 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"NETFILTER_NETLINK_HOOK",
"NF_TABLES",
"NF_CT_NETLINK",
"NF_CONNTRACK",
"NF_FLOW_TABLE",
"NET_ACT_CT",
"NFT_SYNPROXY",
"NF_NAT"
],
"FocusSymbols": [
"nfnl_hook_dump",
"nfnl_hook_dump_nat",
"ctnetlink_alloc_filter",
"ctnetlink_filter_match_tuple",
"nf_ct_seqadj_reset",
"ipv4_synproxy_hook",
"ipv6_synproxy_hook",
"nf_flow_table_cleanup",
"tcf_ct_flow_table_get"
],
"Reasoning": "The patch series touches reachable executable code in core networking and Netfilter subsystems:\n1. Concurrency handling in Netfilter base hook dumps over nfnetlink is refactored with base sequence tracking (net/netfilter/nfnetlink_hook.c, core.c, nf_nat_core.c).\n2. Conntrack netlink filtering gains support for CTA_FILTER_ZONE and fixes an IPv6 comparison bug in tuple matching (net/netfilter/nf_conntrack_netlink.c).\n3. Conntrack sequence adjustment adds nf_ct_seqadj_reset used by synproxy upon reopening connections (net/netfilter/nf_conntrack_seqadj.c, nf_synproxy_core.c).\n4. Flowtable netns cleanup and tc act_ct flowtable initialization ordering are corrected (net/netfilter/nf_flow_table_core.c, net/sched/act_ct.c).\nThese changes are reachable via Netlink sockets, network packet processing, and tc actions without requiring specialized hardware.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"NETFILTER_NETLINK_HOOK",
"NF_TABLES",
"NF_CT_NETLINK",
"NF_CONNTRACK",
"NF_FLOW_TABLE",
"NET_ACT_CT",
"NFT_SYNPROXY",
"NF_NAT"
],
"FocusSymbols": [
"nfnl_hook_dump",
"nfnl_hook_dump_nat",
"ctnetlink_alloc_filter",
"ctnetlink_filter_match_tuple",
"nf_ct_seqadj_reset",
"ipv4_synproxy_hook",
"ipv6_synproxy_hook",
"nf_flow_table_cleanup",
"tcf_ct_flow_table_get"
],
"Reasoning": "The patch series touches reachable executable code in core networking and Netfilter subsystems:\n1. Concurrency handling in Netfilter base hook dumps over nfnetlink is refactored with base sequence tracking (net/netfilter/nfnetlink_hook.c, core.c, nf_nat_core.c).\n2. Conntrack netlink filtering gains support for CTA_FILTER_ZONE and fixes an IPv6 comparison bug in tuple matching (net/netfilter/nf_conntrack_netlink.c).\n3. Conntrack sequence adjustment adds nf_ct_seqadj_reset used by synproxy upon reopening connections (net/netfilter/nf_conntrack_seqadj.c, nf_synproxy_core.c).\n4. Flowtable netns cleanup and tc act_ct flowtable initialization ordering are corrected (net/netfilter/nf_flow_table_core.c, net/sched/act_ct.c).\nThese changes are reachable via Netlink sockets, network packet processing, and tc actions without requiring specialized hardware.",
"WorthFuzzing": true
} |
| 33/1 | 2026/09/29 01:15 | action | If |
1mArgs:{
"WorthFuzzing": true
}Results: null |
| 34/2 | 2026/09/29 01:15 | agent | kmsan-evaluator |
1mModel:core Args: null Results: {
"KMSANReasoning": "The patch series touches several netfilter components:\n1. Adds `CTA_FILTER_ZONE` flag to conntrack netlink filtering (`net/netfilter/nf_conntrack_netlink.c`), where the filter structure is allocated with `kzalloc_obj` ensuring all fields are zero-initialized, and fixes IPv6 address comparison logic (`ipv6_addr_equal`).\n2. Introduces hook generation sequence counters (`hook_base_seq` and `nat_hook_base_seq`) to detect concurrent modifications during netlink dumps (`nfnetlink_hook.c`, `core.c`, `nf_nat_core.c`), both initialized to 1 in `netfilter_net_init`.\n3. Adds `nf_ct_seqadj_reset` to explicitly zero `offset_before` and `offset_after` under lock in `nf_conntrack_seqadj.c`.\n4. Fixes flowtable cleanup to filter by network namespace and moves `write_pnet(\u0026ct_ft-\u003enf_ft.net, net)` before `nf_flow_table_init` in `act_ct.c`, ensuring `flowtable-\u003enet` is initialized before being added to the global flowtables list.\n5. Minor conntrack statistics adjustments, dead code elimination, and comment/typo fixes.\n\nNone of the changes introduce uninitialized variables, expose struct padding or uninitialized buffers to user space, or alter buffer bounds in a way that allows reads of uninitialized memory. Standard KASAN, LOCKDEP, and syzkaller fuzzing are sufficient to detect memory corruption, race conditions, or lifetime issues. KMSAN is not required.",
"NeedsKMSAN": false
}Instruction: You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.
CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
a comprehensive suite of debugging tools and sanitizers, including KASAN
(out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
(locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
or page allocations) and kernel-to-user memory info-leaks.
Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.
Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.
Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
attributes, ioctl output arguments, socket options, or BPF buffers) where fields
or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
uninitialized bytes of existing buffers.
Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
dereferences, locking deadlocks, or use-after-free bugs (these are already caught
by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.
Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
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: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit babef3608013320491bdd26d91a3451f630c9b0b
Author: syz-cluster <triage@syzkaller.com>
Date: Tue Sep 29 01:14:29 2026 +0000
syz-cluster: applied patch under review
diff --git a/Documentation/netlink/specs/conntrack.yaml b/Documentation/netlink/specs/conntrack.yaml
index 1d163130241a7..56c13705243b3 100644
--- a/Documentation/netlink/specs/conntrack.yaml
+++ b/Documentation/netlink/specs/conntrack.yaml
@@ -393,6 +393,12 @@ attribute-sets:
name: reply-flags
type: u32
doc: bitmask of tuple fields to filter on, reply direction
+ -
+ name: zone
+ type: flag
+ doc: >-
+ Filter on conntrack zone id; requires the top-level zone
+ (``CTA_ZONE``) attribute.
-
name: conntrack-attrs
attributes:
diff --git a/Documentation/networking/nf_conntrack-sysctl.rst b/Documentation/networking/nf_conntrack-sysctl.rst
index 35f889259fcdd..4426cce2a73f3 100644
--- a/Documentation/networking/nf_conntrack-sysctl.rst
+++ b/Documentation/networking/nf_conntrack-sysctl.rst
@@ -44,7 +44,7 @@ nf_conntrack_events - BOOLEAN
nf_conntrack_expect_max - INTEGER
Maximum size of expectation table. Default value is
- nf_conntrack_buckets / 256. Minimum is 1.
+ nf_conntrack_buckets / 64. Minimum is 1.
nf_conntrack_frag6_high_thresh - INTEGER
default 262144
diff --git a/include/net/netfilter/nf_conntrack_seqadj.h b/include/net/netfilter/nf_conntrack_seqadj.h
index 883c414b768ee..0f5bbb14a25aa 100644
--- a/include/net/netfilter/nf_conntrack_seqadj.h
+++ b/include/net/netfilter/nf_conntrack_seqadj.h
@@ -33,6 +33,7 @@ static inline struct nf_conn_seqadj *nfct_seqadj_ext_add(struct nf_conn *ct)
int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
s32 off);
+void nf_ct_seqadj_reset(struct nf_conn *ct, enum ip_conntrack_info ctinfo);
int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
__be32 seq, s32 off);
void nf_ct_tcp_seqadj_set(struct sk_buff *skb, struct nf_conn *ct,
diff --git a/include/net/netns/netfilter.h b/include/net/netns/netfilter.h
index a6a0bf4a247e5..7fd78394d1e7b 100644
--- a/include/net/netns/netfilter.h
+++ b/include/net/netns/netfilter.h
@@ -33,5 +33,7 @@ struct netns_nf {
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
unsigned int defrag_ipv6_users;
#endif
+ unsigned int hook_base_seq;
+ unsigned int nat_hook_base_seq;
};
#endif
diff --git a/include/uapi/linux/netfilter/nfnetlink_conntrack.h b/include/uapi/linux/netfilter/nfnetlink_conntrack.h
index 43233af75b9d5..985f9c08d3e9b 100644
--- a/include/uapi/linux/netfilter/nfnetlink_conntrack.h
+++ b/include/uapi/linux/netfilter/nfnetlink_conntrack.h
@@ -285,6 +285,7 @@ enum ctattr_filter {
CTA_FILTER_UNSPEC,
CTA_FILTER_ORIG_FLAGS,
CTA_FILTER_REPLY_FLAGS,
+ CTA_FILTER_ZONE,
__CTA_FILTER_MAX
};
#define CTA_FILTER_MAX (__CTA_FILTER_MAX - 1)
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index db307fa49f3f6..cf747e1e17a36 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -58,7 +58,7 @@ static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
/*
* Unfortunately, _b and _mask are not aligned to an int (or long int)
* Some arches dont care, unrolling the loop is a win on them.
- * For other arches, we only have a 16bit alignement.
+ * For other arches, we only have a 16bit alignment.
*/
static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
{
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 675a1034b3400..940dea2663e95 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -386,6 +386,15 @@ static void nf_static_key_dec(const struct nf_hook_ops *reg, int pf)
#endif
}
+static void bump_hook_base_seq(struct net *net)
+{
+ unsigned int base_seq = READ_ONCE(net->nf.hook_base_seq);
+
+ while (++base_seq == 0)
+ ;
+ smp_store_release(&net->nf.hook_base_seq, base_seq);
+}
+
static int __nf_register_net_hook(struct net *net, int pf,
const struct nf_hook_ops *reg)
{
@@ -430,6 +439,7 @@ static int __nf_register_net_hook(struct net *net, int pf,
if (!IS_ERR(new_hooks)) {
hooks_validate(new_hooks);
rcu_assign_pointer(*pp, new_hooks);
+ bump_hook_base_seq(net);
}
mutex_unlock(&nf_hook_mutex);
@@ -483,6 +493,7 @@ static void __nf_unregister_net_hook(struct net *net, int pf,
{
struct nf_hook_entries __rcu **pp;
struct nf_hook_entries *p;
+ bool found;
pp = nf_hook_entry_head(net, pf, reg->hooknum, reg->dev);
if (!pp)
@@ -496,7 +507,8 @@ static void __nf_unregister_net_hook(struct net *net, int pf,
return;
}
- if (nf_remove_net_hook(p, reg)) {
+ found = nf_remove_net_hook(p, reg);
+ if (found) {
#ifdef CONFIG_NETFILTER_INGRESS
if (nf_ingress_hook(reg, pf))
net_dec_ingress_queue();
@@ -511,6 +523,8 @@ static void __nf_unregister_net_hook(struct net *net, int pf,
}
p = __nf_hook_entries_try_shrink(p, pp);
+ if (found)
+ bump_hook_base_seq(net);
mutex_unlock(&nf_hook_mutex);
if (!p)
return;
@@ -784,6 +798,8 @@ static int __net_init netfilter_net_init(struct net *net)
return -ENOMEM;
}
#endif
+ net->nf.hook_base_seq = 1;
+ net->nf.nat_hook_base_seq = 1;
return 0;
}
diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index 0a86a170ba906..4aeb767088cfa 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -1426,7 +1426,7 @@ static int ip_set_swap(struct sk_buff *skb, const struct nfnl_info *info,
return -IPSET_ERR_EXIST_SETNAME2;
/* Features must not change.
- * Not an artifical restriction anymore, as we must prevent
+ * Not an artificial restriction anymore, as we must prevent
* possible loops created by swapping in setlist type of sets.
*/
if (!(from->type->features == to->type->features &&
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index 5383aeafb0aed..4dacd5af65db9 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -1344,7 +1344,7 @@ static void set_mcast_pmtudisc(struct sock *sk, int val)
}
/*
- * Specifiy default interface for outgoing multicasts
+ * Specify default interface for outgoing multicasts
*/
static int set_mcast_if(struct sock *sk, struct net_device *dev)
{
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index d0d9e5ea84a09..f9b8927327ba9 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1169,7 +1169,6 @@ nf_ct_resolve_clash(struct sk_buff *skb, struct nf_conntrack_tuple_hash *h,
return ret;
drop:
- NF_CT_STAT_INC(net, drop);
NF_CT_STAT_INC(net, insert_failed);
return NF_DROP;
}
@@ -1259,7 +1258,6 @@ __nf_conntrack_confirm(struct sk_buff *skb)
if (chainlen++ > max_chainlen) {
chaintoolong:
NF_CT_STAT_INC(net, chaintoolong);
- NF_CT_STAT_INC(net, insert_failed);
ret = NF_DROP;
goto dying;
}
@@ -2067,9 +2065,10 @@ nf_conntrack_in(struct sk_buff *skb, const struct nf_hook_state *state)
if (ret == -NF_REPEAT)
goto repeat;
- NF_CT_STAT_INC_ATOMIC(state->net, invalid);
if (ret == NF_DROP)
NF_CT_STAT_INC_ATOMIC(state->net, drop);
+ else
+ NF_CT_STAT_INC_ATOMIC(state->net, invalid);
ret = -ret;
goto out;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 4e5d7c7014368..4b6abe36028e3 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -911,6 +911,7 @@ struct ctnetlink_filter {
static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
[CTA_FILTER_ORIG_FLAGS] = NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),
[CTA_FILTER_REPLY_FLAGS] = NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),
+ [CTA_FILTER_ZONE] = { .type = NLA_FLAG },
};
static int ctnetlink_parse_filter(const struct nlattr *attr,
@@ -930,6 +931,9 @@ static int ctnetlink_parse_filter(const struct nlattr *attr,
if (tb[CTA_FILTER_REPLY_FLAGS])
filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
+ if (tb[CTA_FILTER_ZONE])
+ filter->zone_filter = true;
+
return 0;
}
@@ -1006,6 +1010,7 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
if (err)
goto err_filter;
+ /* CTA_ZONE is allowed without CTA_FILTER_ZONE. */
if (cda[CTA_ZONE]) {
err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
if (err < 0)
@@ -1020,6 +1025,12 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
if (err < 0)
goto err_filter;
+ /* CTA_FILTER_ZONE cannot be set without CTA_ZONE. */
+ if (filter->zone_filter && !cda[CTA_ZONE]) {
+ err = -EINVAL;
+ goto err_filter;
+ }
+
if (filter->orig_flags) {
if (!cda[CTA_TUPLE_ORIG]) {
err = -EINVAL;
@@ -1098,13 +1109,13 @@ static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
break;
case NFPROTO_IPV6:
if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
- !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
- &ct_tuple->src.u3.in6))
+ !ipv6_addr_equal(&filter_tuple->src.u3.in6,
+ &ct_tuple->src.u3.in6))
return 0;
if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
- !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
- &ct_tuple->dst.u3.in6))
+ !ipv6_addr_equal(&filter_tuple->dst.u3.in6,
+ &ct_tuple->dst.u3.in6))
return 0;
break;
}
diff --git a/net/netfilter/nf_conntrack_seqadj.c b/net/netfilter/nf_conntrack_seqadj.c
index d75e8dafb189e..b7b166a8ad58c 100644
--- a/net/netfilter/nf_conntrack_seqadj.c
+++ b/net/netfilter/nf_conntrack_seqadj.c
@@ -31,6 +31,23 @@ int nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
}
EXPORT_SYMBOL_GPL(nf_ct_seqadj_init);
+void nf_ct_seqadj_reset(struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+{
+ struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+ struct nf_ct_seqadj *this_way;
+
+ if (unlikely(!seqadj))
+ return;
+
+ spin_lock_bh(&ct->lock);
+ this_way = &seqadj->seq[dir];
+ this_way->offset_before = 0;
+ this_way->offset_after = 0;
+ spin_unlock_bh(&ct->lock);
+}
+EXPORT_SYMBOL_GPL(nf_ct_seqadj_reset);
+
int nf_ct_seqadj_set(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
__be32 seq, s32 off)
{
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
index 934c6151f558b..bd8f9cf394ff1 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -737,14 +737,9 @@ static void nf_flow_table_do_cleanup(struct nf_flowtable *flow_table,
{
struct net_device *dev = data;
- if (!dev) {
- flow_offload_teardown(flow);
- return;
- }
-
- if (net_eq(nf_ct_net(flow->ct), dev_net(dev)) &&
- (flow->tuplehash[0].tuple.iifidx == dev->ifindex ||
- flow->tuplehash[1].tuple.iifidx == dev->ifindex))
+ if (!dev ||
+ flow->tuplehash[0].tuple.iifidx == dev->ifindex ||
+ flow->tuplehash[1].tuple.iifidx == dev->ifindex)
flow_offload_teardown(flow);
}
@@ -761,8 +756,10 @@ void nf_flow_table_cleanup(struct net_device *dev)
struct nf_flowtable *flowtable;
mutex_lock(&flowtable_lock);
- list_for_each_entry(flowtable, &flowtables, list)
- nf_flow_table_gc_cleanup(flowtable, dev);
+ list_for_each_entry(flowtable, &flowtables, list) {
+ if (net_eq(read_pnet(&flowtable->net), dev_net(dev)))
+ nf_flow_table_gc_cleanup(flowtable, dev);
+ }
mutex_unlock(&flowtable_lock);
}
EXPORT_SYMBOL_GPL(nf_flow_table_cleanup);
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 84f82957e66bd..5ddd5fc95b24a 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -1160,6 +1160,15 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct,
}
#endif
+static void bump_nat_hook_base_seq(struct net *net)
+{
+ unsigned int base_seq = READ_ONCE(net->nf.nat_hook_base_seq);
+
+ while (++base_seq == 0)
+ ;
+ smp_store_release(&net->nf.nat_hook_base_seq, base_seq);
+}
+
static struct nf_ct_helper_expectfn follow_master_nat = {
.name = "nat-follow-master",
.expectfn = nf_nat_follow_master,
@@ -1245,6 +1254,7 @@ int nf_nat_register_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
nat_proto_net->nat_hook_ops = nat_ops;
nat_proto_net->users++;
+ bump_nat_hook_base_seq(net);
mutex_unlock(&nf_nat_proto_mutex);
@@ -1299,6 +1309,7 @@ void nf_nat_unregister_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops,
goto unlock;
priv = nat_ops[hooknum].priv;
nf_hook_entries_delete_raw(&priv->entries, ops);
+ bump_nat_hook_base_seq(net);
if (nat_proto_net->users == 0) {
nf_unregister_net_hooks(net, nat_ops, ops_count);
diff --git a/net/netfilter/nf_synproxy_core.c b/net/netfilter/nf_synproxy_core.c
index 9fc959ba20300..401ce5a13f3f4 100644
--- a/net/netfilter/nf_synproxy_core.c
+++ b/net/netfilter/nf_synproxy_core.c
@@ -686,7 +686,7 @@ ipv4_synproxy_hook(void *priv, struct sk_buff *skb,
* adjustments, they will get initialized once the connection is
* reestablished.
*/
- nf_ct_seqadj_init(ct, ctinfo, 0);
+ nf_ct_seqadj_reset(ct, ctinfo);
synproxy->tsoff = 0;
this_cpu_inc(snet->stats->conn_reopened);
fallthrough;
@@ -1116,7 +1116,7 @@ ipv6_synproxy_hook(void *priv, struct sk_buff *skb,
* adjustments, they will get initialized once the connection is
* reestablished.
*/
- nf_ct_seqadj_init(ct, ctinfo, 0);
+ nf_ct_seqadj_reset(ct, ctinfo);
synproxy->tsoff = 0;
this_cpu_inc(snet->stats->conn_reopened);
fallthrough;
diff --git a/net/netfilter/nfnetlink_hook.c b/net/netfilter/nfnetlink_hook.c
index 95005e9a60668..b05fd79397c5b 100644
--- a/net/netfilter/nfnetlink_hook.c
+++ b/net/netfilter/nfnetlink_hook.c
@@ -54,7 +54,6 @@ static int nf_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
struct nfnl_dump_hook_data {
char devname[IFNAMSIZ];
- unsigned long headv;
u8 hook;
};
@@ -338,27 +337,47 @@ nfnl_hook_entries_head(u8 pf, unsigned int hook, struct net *net, const char *de
}
static int nfnl_hook_dump_nat(struct sk_buff *nlskb,
- const struct nfnl_dump_hook_data *ctx,
- const struct nf_hook_ops *ops,
- int family, unsigned int seq)
+ struct netlink_callback *cb,
+ const struct nf_hook_ops *ops, int family)
{
struct nf_nat_lookup_hook_priv *priv = ops->priv;
- struct nf_hook_entries *e = rcu_dereference(priv->entries);
+ struct nfnl_dump_hook_data *ctx = cb->data;
+ struct net *net = sock_net(nlskb->sk);
struct nf_hook_ops **nat_ops;
- int i, err;
+ unsigned int i = cb->args[1];
+ struct nf_hook_entries *e;
+ unsigned int base_seq;
+ int err = 0;
+ base_seq = smp_load_acquire(&net->nf.nat_hook_base_seq);
+
+ e = rcu_dereference(priv->entries);
if (!e)
- return 0;
+ goto out;
nat_ops = nf_hook_entries_get_hook_ops(e);
- for (i = 0; i < e->num_hook_entries; i++) {
- err = nfnl_hook_dump_one(nlskb, ctx, nat_ops[i],
- ops->priority, family, seq);
+ for (; i < e->num_hook_entries; i++) {
+ err = nfnl_hook_dump_one(nlskb, ctx,
+ READ_ONCE(nat_ops[i]),
+ ops->priority, family,
+ cb->nlh->nlmsg_seq);
if (err)
- return err;
+ break;
+
}
- return 0;
+out:
+ if (!err)
+ i = 0;
+ cb->args[1] = i;
+
+ if (cb->args[2] && base_seq != cb->args[2]) {
+ cb->seq++;
+ err = -EINTR;
+ }
+ cb->args[2] = base_seq;
+
+ return err;
}
static int nfnl_hook_dump(struct sk_buff *nlskb,
@@ -373,35 +392,31 @@ static int nfnl_hook_dump(struct sk_buff *nlskb,
unsigned int i = cb->args[0];
rcu_read_lock();
+ cb->seq = smp_load_acquire(&net->nf.hook_base_seq);
e = nfnl_hook_entries_head(family, ctx->hook, net, ctx->devname);
- if (!e)
+ if (!e || IS_ERR(e))
goto done;
- if (IS_ERR(e)) {
- cb->seq++;
- goto done;
- }
-
- if ((unsigned long)e != ctx->headv || i >= e->num_hook_entries)
- cb->seq++;
-
ops = nf_hook_entries_get_hook_ops(e);
for (; i < e->num_hook_entries; i++) {
- if (ops[i]->hook_ops_type == NF_HOOK_OP_NAT)
- err = nfnl_hook_dump_nat(nlskb, ctx, ops[i], family,
- cb->nlh->nlmsg_seq);
- else
- err = nfnl_hook_dump_one(nlskb, ctx, ops[i],
- ops[i]->priority, family,
+ const struct nf_hook_ops *cur = READ_ONCE(ops[i]);
+
+ if (cur->hook_ops_type == NF_HOOK_OP_NAT) {
+ err = nfnl_hook_dump_nat(nlskb, cb, cur, family);
+ } else {
+ err = nfnl_hook_dump_one(nlskb, ctx, cur,
+ cur->priority, family,
cb->nlh->nlmsg_seq);
+ }
if (err)
break;
}
done:
- nl_dump_check_consistent(cb, nlmsg_hdr(nlskb));
+ if (nlskb->len > 0)
+ nl_dump_check_consistent(cb, nlmsg_hdr(nlskb));
rcu_read_unlock();
cb->args[0] = i;
return nlskb->len;
@@ -442,10 +457,7 @@ static int nfnl_hook_dump_start(struct netlink_callback *cb)
return -ENOMEM;
strscpy(ctx->devname, name, sizeof(ctx->devname));
- ctx->headv = (unsigned long)head;
ctx->hook = hooknum;
-
- cb->seq = 1;
cb->data = ctx;
return 0;
diff --git a/net/netfilter/nfnetlink_osf.c b/net/netfilter/nfnetlink_osf.c
index e4835b0f4bb1a..c8cd6af95db47 100644
--- a/net/netfilter/nfnetlink_osf.c
+++ b/net/netfilter/nfnetlink_osf.c
@@ -36,7 +36,6 @@ static inline int nf_osf_ttl(const struct sk_buff *skb,
switch (ttl_check) {
case NF_OSF_TTL_TRUE:
return ip->ttl == f_ttl;
- break;
case NF_OSF_TTL_NOCHECK:
return 1;
case NF_OSF_TTL_LESS:
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index 411e3dd92d072..e26c0d5b2176b 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -349,10 +349,10 @@ static int tcf_ct_flow_table_get(struct net *net, struct tcf_ct_params *params)
ct_ft->nf_ft.type = &flowtable_ct;
ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |
NF_FLOWTABLE_COUNTER;
+ write_pnet(&ct_ft->nf_ft.net, net);
err = nf_flow_table_init(&ct_ft->nf_ft);
if (err)
goto err_init;
- write_pnet(&ct_ft->nf_ft.net, net);
__module_get(THIS_MODULE);
out_unlock:
diff --git a/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c b/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c
index 31b8250ddc53d..0c777323f4ba7 100644
--- a/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c
+++ b/tools/testing/selftests/net/netfilter/conntrack_dump_flush.c
@@ -215,7 +215,22 @@ static int count_entries(const struct nlmsghdr *nlh, void *data)
return MNL_CB_OK;
}
-static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone)
+static void put_zone_attr(struct nlmsghdr *nlh, uint16_t zone,
+ bool use_cta_filter)
+{
+ struct nlattr *nest;
+
+ mnl_attr_put_u16(nlh, CTA_ZONE, htons(zone));
+
+ if (use_cta_filter) {
+ nest = mnl_attr_nest_start(nlh, CTA_FILTER);
+ mnl_attr_put(nlh, CTA_FILTER_ZONE, 0, NULL);
+ mnl_attr_nest_end(nlh, nest);
+ }
+}
+
+static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone,
+ bool use_cta_filter)
{
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
@@ -235,7 +250,7 @@ static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone)
nfh->version = NFNETLINK_V0;
nfh->res_id = 0;
- mnl_attr_put_u16(nlh, CTA_ZONE, htons(zone));
+ put_zone_attr(nlh, zone, use_cta_filter);
ret = mnl_socket_sendto(sock, nlh, nlh->nlmsg_len);
if (ret < 0) {
@@ -261,7 +276,8 @@ static int conntrack_count_zone(struct mnl_socket *sock, uint16_t zone)
return reply_counter;
}
-static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone)
+static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone,
+ bool use_cta_filter)
{
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
@@ -281,7 +297,7 @@ static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone)
nfh->version = NFNETLINK_V0;
nfh->res_id = 0;
- mnl_attr_put_u16(nlh, CTA_ZONE, htons(zone));
+ put_zone_attr(nlh, zone, use_cta_filter);
ret = mnl_socket_sendto(sock, nlh, nlh->nlmsg_len);
if (ret < 0) {
@@ -304,43 +320,40 @@ static int conntrack_flush_zone(struct mnl_socket *sock, uint16_t zone)
return 0;
}
-FIXTURE(conntrack_dump_flush)
-{
- struct mnl_socket *sock;
-};
-
-FIXTURE_SETUP(conntrack_dump_flush)
+static int conntrack_zone_setup(struct __test_metadata *_metadata,
+ struct mnl_socket **sock)
{
struct in6_addr src, dst;
int ret;
- self->sock = mnl_socket_open(NETLINK_NETFILTER);
- if (!self->sock) {
+ *sock = mnl_socket_open(NETLINK_NETFILTER);
+ if (!*sock) {
perror("mnl_socket_open");
- SKIP(return, "cannot open netlink_netfilter socket");
+ SKIP(return -1, "cannot open netlink_netfilter socket");
}
- ret = mnl_socket_bind(self->sock, 0, MNL_SOCKET_AUTOPID);
- EXPECT_EQ(ret, 0);
+ ret = mnl_socket_bind(*sock, 0, MNL_SOCKET_AUTOPID);
+ ASSERT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_count_zone(*sock, TEST_ZONE_ID, false);
if (ret < 0 && errno == EPERM)
- SKIP(return, "Needs to be run as root");
+ SKIP(return -1, "Needs to be run as root");
else if (ret < 0 && errno == EOPNOTSUPP)
- SKIP(return, "Kernel does not seem to support conntrack zones");
+ SKIP(return -1,
+ "Kernel does not seem to support conntrack zones");
- ret = conntrack_data_generate_v4(self->sock, 0xf0f0f0f0, 0xf1f1f1f1,
+ ret = conntrack_data_generate_v4(*sock, 0xf0f0f0f0, 0xf1f1f1f1,
TEST_ZONE_ID);
- EXPECT_EQ(ret, 0);
- ret = conntrack_data_generate_v4(self->sock, 0xf2f2f2f2, 0xf3f3f3f3,
+ ASSERT_EQ(ret, 0);
+ ret = conntrack_data_generate_v4(*sock, 0xf2f2f2f2, 0xf3f3f3f3,
TEST_ZONE_ID + 1);
- EXPECT_EQ(ret, 0);
- ret = conntrack_data_generate_v4(self->sock, 0xf4f4f4f4, 0xf5f5f5f5,
+ ASSERT_EQ(ret, 0);
+ ret = conntrack_data_generate_v4(*sock, 0xf4f4f4f4, 0xf5f5f5f5,
TEST_ZONE_ID + 2);
- EXPECT_EQ(ret, 0);
- ret = conntrack_data_generate_v4(self->sock, 0xf6f6f6f6, 0xf7f7f7f7,
+ ASSERT_EQ(ret, 0);
+ ret = conntrack_data_generate_v4(*sock, 0xf6f6f6f6, 0xf7f7f7f7,
NF_CT_DEFAULT_ZONE_ID);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
src = (struct in6_addr) {{
.__u6_addr32 = {
@@ -358,9 +371,9 @@ FIXTURE_SETUP(conntrack_dump_flush)
0x02000000
}
}};
- ret = conntrack_data_generate_v6(self->sock, src, dst,
+ ret = conntrack_data_generate_v6(*sock, src, dst,
TEST_ZONE_ID);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
src = (struct in6_addr) {{
.__u6_addr32 = {
0xb80d0120,
@@ -377,9 +390,9 @@ FIXTURE_SETUP(conntrack_dump_flush)
0x04000000
}
}};
- ret = conntrack_data_generate_v6(self->sock, src, dst,
+ ret = conntrack_data_generate_v6(*sock, src, dst,
TEST_ZONE_ID + 1);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
src = (struct in6_addr) {{
.__u6_addr32 = {
0xb80d0120,
@@ -396,9 +409,9 @@ FIXTURE_SETUP(conntrack_dump_flush)
0x06000000
}
}};
- ret = conntrack_data_generate_v6(self->sock, src, dst,
+ ret = conntrack_data_generate_v6(*sock, src, dst,
TEST_ZONE_ID + 2);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
src = (struct in6_addr) {{
.__u6_addr32 = {
@@ -416,14 +429,51 @@ FIXTURE_SETUP(conntrack_dump_flush)
0x08000000
}
}};
- ret = conntrack_data_generate_v6(self->sock, src, dst,
+ ret = conntrack_data_generate_v6(*sock, src, dst,
NF_CT_DEFAULT_ZONE_ID);
- EXPECT_EQ(ret, 0);
+ ASSERT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ return 0;
+}
+
+FIXTURE(conntrack_dump_flush)
+{
+ struct mnl_socket *sock;
+};
+
+FIXTURE_VARIANT(conntrack_dump_flush)
+{
+ bool use_cta_filter;
+};
+
+FIXTURE_VARIANT_ADD(conntrack_dump_flush, cta_zone)
+{
+ .use_cta_filter = false,
+};
+
+FIXTURE_VARIANT_ADD(conntrack_dump_flush, cta_filter)
+{
+ .use_cta_filter = true,
+};
+
+FIXTURE_SETUP(conntrack_dump_flush)
+{
+ int ret;
+
+ if (conntrack_zone_setup(_metadata, &self->sock))
+ return;
+
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID, false);
EXPECT_GE(ret, 2);
if (ret > 2)
SKIP(return, "kernel does not support filtering by zone");
+
+ if (variant->use_cta_filter) {
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID, true);
+ if (ret < 0 && errno == EINVAL)
+ SKIP(return, "kernel does not support CTA_FILTER_ZONE");
+ ASSERT_GE(ret, 0);
+ }
}
FIXTURE_TEARDOWN(conntrack_dump_flush)
@@ -434,39 +484,42 @@ TEST_F(conntrack_dump_flush, test_dump_by_zone)
{
int ret;
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID,
+ variant->use_cta_filter);
EXPECT_EQ(ret, 2);
}
TEST_F(conntrack_dump_flush, test_flush_by_zone)
{
+ bool filter = variant->use_cta_filter;
int ret;
- ret = conntrack_flush_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_flush_zone(self->sock, TEST_ZONE_ID, filter);
EXPECT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID, filter);
EXPECT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 1);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 1, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 2);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 2, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID, filter);
EXPECT_EQ(ret, 2);
}
TEST_F(conntrack_dump_flush, test_flush_by_zone_default)
{
+ bool filter = variant->use_cta_filter;
int ret;
- ret = conntrack_flush_zone(self->sock, NF_CT_DEFAULT_ZONE_ID);
+ ret = conntrack_flush_zone(self->sock, NF_CT_DEFAULT_ZONE_ID, filter);
EXPECT_EQ(ret, 0);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 1);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 1, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 2);
+ ret = conntrack_count_zone(self->sock, TEST_ZONE_ID + 2, filter);
EXPECT_EQ(ret, 2);
- ret = conntrack_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID);
+ ret = conntrack_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID, filter);
EXPECT_EQ(ret, 0);
}
diff --git a/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh b/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh
index c63d840ead61f..f63b7f12b36ab 100755
--- a/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh
+++ b/tools/testing/selftests/net/netfilter/conntrack_icmp_related.sh
@@ -171,7 +171,7 @@ table inet filter {
}
EOF
-# make sure NAT core rewrites adress of icmp error if nat is used according to
+# make sure NAT core rewrites address of icmp error if nat is used according to
# conntrack nat information (icmp error will be directed at nsrouter1 address,
# but it needs to be routed to nsclient1 address).
ip netns exec "$nsrouter1" nft -f - <<EOF
|
| 35/3 | 2026/09/29 01:15 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 13869 output: 43 thoughts: 1938 Thoughts: **Patch Series Analysis: Conntrack and Netfilter Improvements** Okay, here's what I'm seeing in this patch series. First, I need to understand the scope, so let's break it down file by file. This series seems to be a combination of documentation updates, bug fixes, and some new feature additions related to connection tracking (conntrack) and netfilter. * **Documentation**: Initial focus is on updating the documentation for the `zone` filter flag within `conntrack.yaml` spec and a default value update in `nf_conntrack-sysctl.rst`. I should make a note to check how the zone filtering is implemented, since that's new. * **Sequence Adjustment and Reset**: The series introduces `nf_ct_seqadj_reset`, which essentially zeroes out sequence adjustment offsets for a connection. This is a good thing; it seems like a cleanup or reset function for sequence adjustment data. I need to understand where this is being used and why they decided to call it a *reset*, specifically. I want to confirm that `nf_ct_seqadj_init` is properly replaced with `nf_ct_seqadj_reset` in `nf_synproxy_core.c` to maintain consistency. * **Hook Sequence Generation & Consistency**: The code introduces sequence counters for hook registration/unregistration. This seems designed to ensure consistency during hook dumps. `hook_base_seq` and `nat_hook_base_seq` are added with initialization in `netfilter_net_init` and their modification within `core.c` and `nf_nat_core.c`. This is essential to guarantee accurate and consistent information during hook dumps within `nfnl_hook_dump_nat` and `nfnl_hook_dump`. The important bit is to check for the proper use of atomic operations in the dump code to prevent race conditions. * **Zone Filter in Netlink**: The new `CTA_FILTER_ZONE` attribute for filtering in netlink is added. This requires scrutiny, especially the parsing and validation logic in `ctnetlink_alloc_filter`. The associated policy is added too. I immediately need to examine the check `if (filter->zone_filter && !cda[CTA_ZONE])` to ensure there's no way to trigger a crash or expose uninitialized memory. Also the fix to replace `ipv6_addr_cmp` with `ipv6_addr_equal` is a critical bug fix, that I need to confirm is accurate because I saw what looks like a potential double negative in the original comparison. * **Typo Fixes**: I'll give the typo fixes a quick glance. Nothing major, but it's good to keep the code clean. * **Statistics Cleanup**: Changes to statistics incrementing in `nf_conntrack_core.c` look reasonable, removing unnecessary increments. This reduces overhead, which is a good optimization. * **Flow Table Cleanup**: The change in `nf_flow_table_do_cleanup` seems to simplify the logic related to device checks during flow table cleanup. And the added logic to `nf_flow_table_cleanup` adds network namespace check too. I need to make sure that the original intention of cleanup is preserved. * **Unreachable Code Removal**: Removing the `break` statement in `nfnetlink_osf.c` after the `return` is a minor cleanup. * **Flow Table Initialization**: The change in `net/sched/act_ct.c` to move `write_pnet` *before* `nf_flow_table_init` seems important to ensure the network namespace is properly set for the flow table during initialization. This is a potential bug fix or optimization. I need to verify that `nf_flow_table_init` and any functions it calls actually need the network namespace, and if so, this fix is critical. * **Selftest Update**: Updating the selftest to test `CTA_FILTER_ZONE` is good. This is important to verify the new feature's correctness. Overall, it seems like a collection of bug fixes, some cleanup, and a new feature. I will check `ctnetlink_alloc_filter` in `net/netfilter/nf_conntrack_netlink.c` from lines 911-1040 for the potential uninitialized memory reads. I want to confirm each patch is logically sound and consistent and that no regressions are introduced. |
| 36/3 | 2026/09/29 01:15 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nf_conntrack_netlink.c",
"FirstLine": 905,
"LineCount": 80
}Results: {
"Contents": " 905:\t\tstruct nf_conntrack_zone zone;\n 906:\t\n 907:\t\tstruct ctnetlink_filter_u32 mark;\n 908:\t\tstruct ctnetlink_filter_u32 status;\n 909:\t};\n 910:\t\n 911:\tstatic const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {\n 912:\t\t[CTA_FILTER_ORIG_FLAGS]\t\t= NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),\n 913:\t\t[CTA_FILTER_REPLY_FLAGS]\t= NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),\n 914:\t\t[CTA_FILTER_ZONE]\t\t= { .type = NLA_FLAG },\n 915:\t};\n 916:\t\n 917:\tstatic int ctnetlink_parse_filter(const struct nlattr *attr,\n 918:\t\t\t\t\t struct ctnetlink_filter *filter)\n 919:\t{\n 920:\t\tstruct nlattr *tb[CTA_FILTER_MAX + 1];\n 921:\t\tint ret = 0;\n 922:\t\n 923:\t\tret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,\n 924:\t\t\t\t NULL);\n 925:\t\tif (ret)\n 926:\t\t\treturn ret;\n 927:\t\n 928:\t\tif (tb[CTA_FILTER_ORIG_FLAGS])\n 929:\t\t\tfilter-\u003eorig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);\n 930:\t\n 931:\t\tif (tb[CTA_FILTER_REPLY_FLAGS])\n 932:\t\t\tfilter-\u003ereply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);\n 933:\t\n 934:\t\tif (tb[CTA_FILTER_ZONE])\n 935:\t\t\tfilter-\u003ezone_filter = true;\n 936:\t\n 937:\t\treturn 0;\n 938:\t}\n 939:\t\n 940:\tstatic int ctnetlink_parse_zone(const struct nlattr *attr,\n 941:\t\t\t\t\tstruct nf_conntrack_zone *zone);\n 942:\tstatic int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],\n 943:\t\t\t\t\t\t struct nf_conntrack_tuple *tuple,\n 944:\t\t\t\t\t\t u32 type, u_int8_t l3num,\n 945:\t\t\t\t\t\t struct nf_conntrack_zone *zone,\n 946:\t\t\t\t\t\t u_int32_t flags);\n 947:\t\n 948:\tstatic int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark,\n 949:\t\t\t\t\t const struct nlattr * const cda[])\n 950:\t{\n 951:\t#ifdef CONFIG_NF_CONNTRACK_MARK\n 952:\t\tif (cda[CTA_MARK]) {\n 953:\t\t\tmark-\u003eval = ntohl(nla_get_be32(cda[CTA_MARK]));\n 954:\t\n 955:\t\t\tif (cda[CTA_MARK_MASK])\n 956:\t\t\t\tmark-\u003emask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));\n 957:\t\t\telse\n 958:\t\t\t\tmark-\u003emask = 0xffffffff;\n 959:\t\t} else if (cda[CTA_MARK_MASK]) {\n 960:\t\t\treturn -EINVAL;\n 961:\t\t}\n 962:\t#endif\n 963:\t\treturn 0;\n 964:\t}\n 965:\t\n 966:\tstatic int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status,\n 967:\t\t\t\t\t\t const struct nlattr * const cda[])\n 968:\t{\n 969:\t\tif (cda[CTA_STATUS]) {\n 970:\t\t\tstatus-\u003eval = ntohl(nla_get_be32(cda[CTA_STATUS]));\n 971:\t\t\tif (cda[CTA_STATUS_MASK])\n 972:\t\t\t\tstatus-\u003emask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK]));\n 973:\t\t\telse\n 974:\t\t\t\tstatus-\u003emask = status-\u003eval;\n 975:\t\n 976:\t\t\t/* status-\u003eval == 0? always true, else always false. */\n 977:\t\t\tif (status-\u003emask == 0)\n 978:\t\t\t\treturn -EINVAL;\n 979:\t\t} else if (cda[CTA_STATUS_MASK]) {\n 980:\t\t\treturn -EINVAL;\n 981:\t\t}\n 982:\t\n 983:\t\t/* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */\n 984:\t\tBUILD_BUG_ON(__IPS_MAX_BIT \u003e= 32);\n"
} |
| 37/3 | 2026/09/29 01:15 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18170 output: 43 thoughts: 33 Thoughts: Okay, here's my interpretation of what's going through my mind, an expert in the field, when considering that code snippet: **Diving into the Conntrack Netlink Code** Right, let's get down to brass tacks. I need a refresher on the Netlink interface for conntrack. Specifically, I'm thinking I should jump into `net/netfilter/nf_conntrack_netlink.c`, that's where the magic happens. I should focus on the section from line 985 to 1040. Why those lines? Likely because they deal with a critical function or feature related to how conntrack communicates and how the kernel handles netlink messages to update or query connection tracking entries. It could be parsing incoming attributes, handling specific Netlink messages, or updating the conntrack table somehow. I want to see precisely how this module receives and processes information and what data structures are being used in that process. I'm probably looking for how it handles errors, too, and what kind of validation it performs. In other words, I'm trying to determine the logic flow. Let's see what’s going on in that chunk of code. |
| 38/3 | 2026/09/29 01:15 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nf_conntrack_netlink.c",
"FirstLine": 985,
"LineCount": 60
}Results: {
"Contents": " 985:\t\treturn 0;\n 986:\t}\n 987:\t\n 988:\tstatic struct ctnetlink_filter *\n 989:\tctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)\n 990:\t{\n 991:\t\tstruct ctnetlink_filter *filter;\n 992:\t\tint err;\n 993:\t\n 994:\t#ifndef CONFIG_NF_CONNTRACK_MARK\n 995:\t\tif (cda[CTA_MARK] || cda[CTA_MARK_MASK])\n 996:\t\t\treturn ERR_PTR(-EOPNOTSUPP);\n 997:\t#endif\n 998:\t\n 999:\t\tfilter = kzalloc_obj(*filter);\n1000:\t\tif (filter == NULL)\n1001:\t\t\treturn ERR_PTR(-ENOMEM);\n1002:\t\n1003:\t\tfilter-\u003efamily = family;\n1004:\t\n1005:\t\terr = ctnetlink_filter_parse_mark(\u0026filter-\u003emark, cda);\n1006:\t\tif (err)\n1007:\t\t\tgoto err_filter;\n1008:\t\n1009:\t\terr = ctnetlink_filter_parse_status(\u0026filter-\u003estatus, cda);\n1010:\t\tif (err)\n1011:\t\t\tgoto err_filter;\n1012:\t\n1013:\t\t/* CTA_ZONE is allowed without CTA_FILTER_ZONE. */\n1014:\t\tif (cda[CTA_ZONE]) {\n1015:\t\t\terr = ctnetlink_parse_zone(cda[CTA_ZONE], \u0026filter-\u003ezone);\n1016:\t\t\tif (err \u003c 0)\n1017:\t\t\t\tgoto err_filter;\n1018:\t\t\tfilter-\u003ezone_filter = true;\n1019:\t\t}\n1020:\t\n1021:\t\tif (!cda[CTA_FILTER])\n1022:\t\t\treturn filter;\n1023:\t\n1024:\t\terr = ctnetlink_parse_filter(cda[CTA_FILTER], filter);\n1025:\t\tif (err \u003c 0)\n1026:\t\t\tgoto err_filter;\n1027:\t\n1028:\t\t/* CTA_FILTER_ZONE cannot be set without CTA_ZONE. */\n1029:\t\tif (filter-\u003ezone_filter \u0026\u0026 !cda[CTA_ZONE]) {\n1030:\t\t\terr = -EINVAL;\n1031:\t\t\tgoto err_filter;\n1032:\t\t}\n1033:\t\n1034:\t\tif (filter-\u003eorig_flags) {\n1035:\t\t\tif (!cda[CTA_TUPLE_ORIG]) {\n1036:\t\t\t\terr = -EINVAL;\n1037:\t\t\t\tgoto err_filter;\n1038:\t\t\t}\n1039:\t\n1040:\t\t\terr = ctnetlink_parse_tuple_filter(cda, \u0026filter-\u003eorig,\n1041:\t\t\t\t\t\t\t CTA_TUPLE_ORIG,\n1042:\t\t\t\t\t\t\t filter-\u003efamily,\n1043:\t\t\t\t\t\t\t \u0026filter-\u003ezone,\n1044:\t\t\t\t\t\t\t filter-\u003eorig_flags);\n"
} |
| 39/3 | 2026/09/29 01:15 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 19345 output: 43 thoughts: 81 Thoughts: Here's my take on the thought process, as if I were the one thinking it: **Deconstructing `ctnetlink_alloc_filter` - Initialization and Structure** Okay, let's dive into this `ctnetlink_alloc_filter` function. The first thing that jumps out is the memory allocation. We're using `kzalloc_obj` to allocate the `filter` pointer. Now, that's crucial – `kzalloc` is going to zero-initialize the entire `struct ctnetlink_filter`. This means all the fields are starting at 0, which is important for understanding subsequent code and potential initial states. Alright, let's zoom in on `filter->zone_filter`. It's a boolean variable within the `struct ctnetlink_filter`. To be absolutely clear on what's going on with this variable, I should probably double-check the definition of `struct ctnetlink_filter`. Let me scroll up and take a look around lines 890-910 to confirm its exact structure. Knowing the exact structure and order of the struct will make further analysis easier. |
| 40/3 | 2026/09/29 01:15 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nf_conntrack_netlink.c",
"FirstLine": 890,
"LineCount": 25
}Results: {
"Contents": " 890:\t\n 891:\tstruct ctnetlink_filter_u32 {\n 892:\t\tu32 val;\n 893:\t\tu32 mask;\n 894:\t};\n 895:\t\n 896:\tstruct ctnetlink_filter {\n 897:\t\tu8 family;\n 898:\t\tbool zone_filter;\n 899:\t\n 900:\t\tu_int32_t orig_flags;\n 901:\t\tu_int32_t reply_flags;\n 902:\t\n 903:\t\tstruct nf_conntrack_tuple orig;\n 904:\t\tstruct nf_conntrack_tuple reply;\n 905:\t\tstruct nf_conntrack_zone zone;\n 906:\t\n 907:\t\tstruct ctnetlink_filter_u32 mark;\n 908:\t\tstruct ctnetlink_filter_u32 status;\n 909:\t};\n 910:\t\n 911:\tstatic const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {\n 912:\t\t[CTA_FILTER_ORIG_FLAGS]\t\t= NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),\n 913:\t\t[CTA_FILTER_REPLY_FLAGS]\t= NLA_POLICY_MASK(NLA_U32, CTA_FILTER_F_ALL),\n 914:\t\t[CTA_FILTER_ZONE]\t\t= { .type = NLA_FLAG },\n"
} |
| 41/3 | 2026/09/29 01:15 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 20125 output: 44 thoughts: 344 Thoughts: **Analyzing the Zone Filter Logic** Okay, so I'm looking at this `ctnetlink_filter` struct and I'm reminded that it *already* had a `bool zone_filter` field. And, as I recall, `kzalloc_obj` initializes it to false. That's the baseline. Now I'm diving into the attribute parsing. Ah, there it is! The code snippet... first checks if `CTA_ZONE` is present. If it *is*, then `ctnetlink_parse_zone` is called and, importantly, `filter->zone_filter` is explicitly set to `true`. Good, standard behavior. Then, it checks for `CTA_FILTER`. If it exists, `ctnetlink_parse_filter` gets called. Now, here's the kicker: `ctnetlink_parse_filter` can *also* set `filter->zone_filter` to `true`, presumably based on the presence of a specific attribute within the `CTA_FILTER` data, like `CTA_FILTER_ZONE`. Okay, so that's two different ways `zone_filter` can be set to true. The critical bit is this final check. It states that if `filter->zone_filter` is already true (i.e. was set from either CTA_ZONE or CTA_FILTER) but `CTA_ZONE` itself *wasn't* provided, then it's an invalid configuration and returns `-EINVAL`. Aha! This suggests a constraint: setting a zone filter requires an explicitly provided zone, and is likely validated further in `ctnetlink_filter_match`. I need to review how that flag is used in `ctnetlink_filter_match`. |
| 42/3 | 2026/09/29 01:15 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nf_conntrack_netlink.c",
"FirstLine": 1120,
"LineCount": 40
}Results: {
"Contents": "1120:\t\t\tbreak;\n1121:\t\t}\n1122:\t\n1123:\t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_PROTO_NUM)) \u0026\u0026\n1124:\t\t filter_tuple-\u003edst.protonum != ct_tuple-\u003edst.protonum)\n1125:\t\t\treturn 0;\n1126:\t\n1127:\t\tswitch (ct_tuple-\u003edst.protonum) {\n1128:\t\tcase IPPROTO_TCP:\n1129:\t\tcase IPPROTO_UDP:\n1130:\t\t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) \u0026\u0026\n1131:\t\t\t filter_tuple-\u003esrc.u.tcp.port != ct_tuple-\u003esrc.u.tcp.port)\n1132:\t\t\t\treturn 0;\n1133:\t\n1134:\t\t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) \u0026\u0026\n1135:\t\t\t filter_tuple-\u003edst.u.tcp.port != ct_tuple-\u003edst.u.tcp.port)\n1136:\t\t\t\treturn 0;\n1137:\t\t\tbreak;\n1138:\t\tcase IPPROTO_ICMP:\n1139:\t\t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) \u0026\u0026\n1140:\t\t\t filter_tuple-\u003edst.u.icmp.type != ct_tuple-\u003edst.u.icmp.type)\n1141:\t\t\t\treturn 0;\n1142:\t\t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) \u0026\u0026\n1143:\t\t\t filter_tuple-\u003edst.u.icmp.code != ct_tuple-\u003edst.u.icmp.code)\n1144:\t\t\t\treturn 0;\n1145:\t\t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) \u0026\u0026\n1146:\t\t\t filter_tuple-\u003esrc.u.icmp.id != ct_tuple-\u003esrc.u.icmp.id)\n1147:\t\t\t\treturn 0;\n1148:\t\t\tbreak;\n1149:\t\tcase IPPROTO_ICMPV6:\n1150:\t\t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) \u0026\u0026\n1151:\t\t\t filter_tuple-\u003edst.u.icmp.type != ct_tuple-\u003edst.u.icmp.type)\n1152:\t\t\t\treturn 0;\n1153:\t\t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) \u0026\u0026\n1154:\t\t\t filter_tuple-\u003edst.u.icmp.code != ct_tuple-\u003edst.u.icmp.code)\n1155:\t\t\t\treturn 0;\n1156:\t\t\tif ((flags \u0026 CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) \u0026\u0026\n1157:\t\t\t filter_tuple-\u003esrc.u.icmp.id != ct_tuple-\u003esrc.u.icmp.id)\n1158:\t\t\t\treturn 0;\n1159:\t\t\tbreak;\n"
} |
| 43/3 | 2026/09/29 01:15 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 21657 output: 38 thoughts: 27 Thoughts: Here's my take on those thoughts, tailored for an expert audience: **Diving into `nf_conntrack_netlink.c`** Alright, so I need to understand where the `filter->zone_filter` field is being evaluated within `nf_conntrack_netlink.c`. I'm going to start by grepping the code for that specific variable name. This should give me a good overview of how it's used – whether it's for policy enforcement, filtering, logging, or something else entirely. I'll need to pay close attention to the context of each usage; what functions are calling it, what data structures are involved, and what the overall goal of the code segment is. Knowing the call stack will be key to understanding the intended logic. I'm anticipating that this will likely be related to zone-based filtering, perhaps for managing conntrack entries based on their associated network zone. This is a common pattern, and I'm keen to see the specific implementation details, especially how it interacts with the netlink interface. I'm expecting some conditional checks, maybe some bitwise operations, and likely some interaction with the conntrack table itself. Let's see what the code actually reveals! |
| 44/3 | 2026/09/29 01:15 | tool | grepper |
0mArgs:{
"Expression": "zone_filter",
"PathPrefix": "net/netfilter/nf_conntrack_netlink.c"
}Results: {
"Output": "net/netfilter/nf_conntrack_netlink.c=896=struct ctnetlink_filter {\nnet/netfilter/nf_conntrack_netlink.c-897-\tu8 family;\nnet/netfilter/nf_conntrack_netlink.c:898:\tbool zone_filter;\nnet/netfilter/nf_conntrack_netlink.c-899-\n--\nnet/netfilter/nf_conntrack_netlink.c=917=static int ctnetlink_parse_filter(const struct nlattr *attr,\n--\nnet/netfilter/nf_conntrack_netlink.c-934-\tif (tb[CTA_FILTER_ZONE])\nnet/netfilter/nf_conntrack_netlink.c:935:\t\tfilter-\u003ezone_filter = true;\nnet/netfilter/nf_conntrack_netlink.c-936-\n--\nnet/netfilter/nf_conntrack_netlink.c=989=ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)\n--\nnet/netfilter/nf_conntrack_netlink.c-1017-\t\t\tgoto err_filter;\nnet/netfilter/nf_conntrack_netlink.c:1018:\t\tfilter-\u003ezone_filter = true;\nnet/netfilter/nf_conntrack_netlink.c-1019-\t}\n--\nnet/netfilter/nf_conntrack_netlink.c-1028-\t/* CTA_FILTER_ZONE cannot be set without CTA_ZONE. */\nnet/netfilter/nf_conntrack_netlink.c:1029:\tif (filter-\u003ezone_filter \u0026\u0026 !cda[CTA_ZONE]) {\nnet/netfilter/nf_conntrack_netlink.c-1030-\t\terr = -EINVAL;\n--\nnet/netfilter/nf_conntrack_netlink.c=1165=static int ctnetlink_filter_match(struct nf_conn *ct, void *data)\n--\nnet/netfilter/nf_conntrack_netlink.c-1180-\nnet/netfilter/nf_conntrack_netlink.c:1181:\tif (filter-\u003ezone_filter \u0026\u0026\nnet/netfilter/nf_conntrack_netlink.c-1182-\t !nf_ct_zone_equal_any(ct, \u0026filter-\u003ezone))\n"
} |
| 45/3 | 2026/09/29 01:15 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22602 output: 40 thoughts: 50 Thoughts: Okay, let's dive into this. **Examining the Core: `nfnetlink_hook.c`** Alright, I'm going to take a closer look at the `net/netfilter/nfnetlink_hook.c` file. Specifically, I'm focusing on lines 330 through 470. That section likely deals with a crucial part of the Netfilter netlink interface - perhaps hook registration, event handling, or some core packet processing logic. I need to understand exactly how the interaction between userspace and the kernel works here. I expect to find some interesting locking mechanisms and perhaps some subtle race conditions that are typically found in this code. It will be exciting to dive in here. |
| 46/3 | 2026/09/29 01:16 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nfnetlink_hook.c",
"FirstLine": 330,
"LineCount": 80
}Results: {
"Contents": " 330:\t\t\tfallthrough;\n 331:\t#endif\n 332:\t\tdefault:\n 333:\t\t\treturn ERR_PTR(-EPROTONOSUPPORT);\n 334:\t\t}\n 335:\t\n 336:\t\treturn hook_head;\n 337:\t}\n 338:\t\n 339:\tstatic int nfnl_hook_dump_nat(struct sk_buff *nlskb,\n 340:\t\t\t\t struct netlink_callback *cb,\n 341:\t\t\t\t const struct nf_hook_ops *ops, int family)\n 342:\t{\n 343:\t\tstruct nf_nat_lookup_hook_priv *priv = ops-\u003epriv;\n 344:\t\tstruct nfnl_dump_hook_data *ctx = cb-\u003edata;\n 345:\t\tstruct net *net = sock_net(nlskb-\u003esk);\n 346:\t\tstruct nf_hook_ops **nat_ops;\n 347:\t\tunsigned int i = cb-\u003eargs[1];\n 348:\t\tstruct nf_hook_entries *e;\n 349:\t\tunsigned int base_seq;\n 350:\t\tint err = 0;\n 351:\t\n 352:\t\tbase_seq = smp_load_acquire(\u0026net-\u003enf.nat_hook_base_seq);\n 353:\t\n 354:\t\te = rcu_dereference(priv-\u003eentries);\n 355:\t\tif (!e)\n 356:\t\t\tgoto out;\n 357:\t\n 358:\t\tnat_ops = nf_hook_entries_get_hook_ops(e);\n 359:\t\n 360:\t\tfor (; i \u003c e-\u003enum_hook_entries; i++) {\n 361:\t\t\terr = nfnl_hook_dump_one(nlskb, ctx,\n 362:\t\t\t\t\t\t READ_ONCE(nat_ops[i]),\n 363:\t\t\t\t\t\t ops-\u003epriority, family,\n 364:\t\t\t\t\t\t cb-\u003enlh-\u003enlmsg_seq);\n 365:\t\t\tif (err)\n 366:\t\t\t\tbreak;\n 367:\t\n 368:\t\t}\n 369:\tout:\n 370:\t\tif (!err)\n 371:\t\t\ti = 0;\n 372:\t\tcb-\u003eargs[1] = i;\n 373:\t\n 374:\t\tif (cb-\u003eargs[2] \u0026\u0026 base_seq != cb-\u003eargs[2]) {\n 375:\t\t\tcb-\u003eseq++;\n 376:\t\t\terr = -EINTR;\n 377:\t\t}\n 378:\t\tcb-\u003eargs[2] = base_seq;\n 379:\t\n 380:\t\treturn err;\n 381:\t}\n 382:\t\n 383:\tstatic int nfnl_hook_dump(struct sk_buff *nlskb,\n 384:\t\t\t\t struct netlink_callback *cb)\n 385:\t{\n 386:\t\tstruct nfgenmsg *nfmsg = nlmsg_data(cb-\u003enlh);\n 387:\t\tstruct nfnl_dump_hook_data *ctx = cb-\u003edata;\n 388:\t\tint err, family = nfmsg-\u003enfgen_family;\n 389:\t\tstruct net *net = sock_net(nlskb-\u003esk);\n 390:\t\tstruct nf_hook_ops * const *ops;\n 391:\t\tconst struct nf_hook_entries *e;\n 392:\t\tunsigned int i = cb-\u003eargs[0];\n 393:\t\n 394:\t\trcu_read_lock();\n 395:\t\tcb-\u003eseq = smp_load_acquire(\u0026net-\u003enf.hook_base_seq);\n 396:\t\n 397:\t\te = nfnl_hook_entries_head(family, ctx-\u003ehook, net, ctx-\u003edevname);\n 398:\t\tif (!e || IS_ERR(e))\n 399:\t\t\tgoto done;\n 400:\t\n 401:\t\tops = nf_hook_entries_get_hook_ops(e);\n 402:\t\n 403:\t\tfor (; i \u003c e-\u003enum_hook_entries; i++) {\n 404:\t\t\tconst struct nf_hook_ops *cur = READ_ONCE(ops[i]);\n 405:\t\n 406:\t\t\tif (cur-\u003ehook_ops_type == NF_HOOK_OP_NAT) {\n 407:\t\t\t\terr = nfnl_hook_dump_nat(nlskb, cb, cur, family);\n 408:\t\t\t} else {\n 409:\t\t\t\terr = nfnl_hook_dump_one(nlskb, ctx, cur,\n"
} |
| 47/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 24075 output: 40 thoughts: 29 Thoughts: Here's a first-person summary, tailored for an expert audience, based on the provided thought: **Checking `cb->args` Handling in `nfnl_hook_dump`** Alright, let's dive into the `nfnl_hook_dump` function, specifically focusing on how it handles `cb->args`. I want to zero in on lines 410 through 460. I know this section is critical for correctly parsing and interpreting the arguments passed to the Netlink notification functions during a dump operation, and this seems like the place to start if there are any issues. I need to make sure the arguments are being handled robustly, type-correctly, and without any potential for buffer overflows or incorrect memory access. A misstep here could easily lead to data corruption or even a security vulnerability, so a quick run-through will be the perfect starting point to investigate. |
| 48/3 | 2026/09/29 01:16 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nfnetlink_hook.c",
"FirstLine": 410,
"LineCount": 55
}Results: {
"Contents": " 410:\t\t\t\t\t\t\t cur-\u003epriority, family,\n 411:\t\t\t\t\t\t\t cb-\u003enlh-\u003enlmsg_seq);\n 412:\t\t\t}\n 413:\t\t\tif (err)\n 414:\t\t\t\tbreak;\n 415:\t\t}\n 416:\t\n 417:\tdone:\n 418:\t\tif (nlskb-\u003elen \u003e 0)\n 419:\t\t\tnl_dump_check_consistent(cb, nlmsg_hdr(nlskb));\n 420:\t\trcu_read_unlock();\n 421:\t\tcb-\u003eargs[0] = i;\n 422:\t\treturn nlskb-\u003elen;\n 423:\t}\n 424:\t\n 425:\tstatic int nfnl_hook_dump_start(struct netlink_callback *cb)\n 426:\t{\n 427:\t\tconst struct nfgenmsg *nfmsg = nlmsg_data(cb-\u003enlh);\n 428:\t\tconst struct nlattr * const *nla = cb-\u003edata;\n 429:\t\tstruct nfnl_dump_hook_data *ctx = NULL;\n 430:\t\tstruct net *net = sock_net(cb-\u003eskb-\u003esk);\n 431:\t\tu8 family = nfmsg-\u003enfgen_family;\n 432:\t\tchar name[IFNAMSIZ] = \"\";\n 433:\t\tconst void *head;\n 434:\t\tu32 hooknum;\n 435:\t\n 436:\t\thooknum = ntohl(nla_get_be32(nla[NFNLA_HOOK_HOOKNUM]));\n 437:\t\tif (hooknum \u003e 255)\n 438:\t\t\treturn -EINVAL;\n 439:\t\n 440:\t\tif (family == NFPROTO_NETDEV) {\n 441:\t\t\tif (!nla[NFNLA_HOOK_DEV])\n 442:\t\t\t\treturn -EINVAL;\n 443:\t\n 444:\t\t\tnla_strscpy(name, nla[NFNLA_HOOK_DEV], sizeof(name));\n 445:\t\t}\n 446:\t\n 447:\t\trcu_read_lock();\n 448:\t\t/* Not dereferenced; for consistency check only */\n 449:\t\thead = nfnl_hook_entries_head(family, hooknum, net, name);\n 450:\t\trcu_read_unlock();\n 451:\t\n 452:\t\tif (head \u0026\u0026 IS_ERR(head))\n 453:\t\t\treturn PTR_ERR(head);\n 454:\t\n 455:\t\tctx = kzalloc_obj(*ctx);\n 456:\t\tif (!ctx)\n 457:\t\t\treturn -ENOMEM;\n 458:\t\n 459:\t\tstrscpy(ctx-\u003edevname, name, sizeof(ctx-\u003edevname));\n 460:\t\tctx-\u003ehook = hooknum;\n 461:\t\tcb-\u003edata = ctx;\n 462:\t\n 463:\t\treturn 0;\n 464:\t}\n"
} |
| 49/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 25144 output: 41 thoughts: 481 Thoughts: **Analyzing Netfilter Conntrack Sequence Adjustment** Okay, let's break this down. My initial focus is on how sequence numbers are handled within Netfilter, specifically looking at `nfnl_hook_dump_nat` and its relationship to `nfnl_hook_dump`. The core issue revolves around data structures and how information is passed between these functions. I can see that, on the initial run of `nfnl_hook_dump`, the `cb->args` array (within the `netlink_callback` struct) is initialized to all zeros. `nfnl_hook_dump_nat` grabs an index using `unsigned int i = cb->args[1];` and then reads a sequence value, `base_seq`, using `smp_load_acquire` from `net->nf.nat_hook_base_seq`. The interesting part is what happens at the end of the loop. The code seems designed to track state across multiple calls. Specifically, the value `i` is potentially modified and stored back into `cb->args[1]`. `base_seq` is compared against `cb->args[2]`. If a discrepancy exists, it increments the sequence number `cb->seq` and returns `-EINTR`. This looks like a mechanism to handle concurrent changes or updates. The values in `cb->args` and `base_seq` seem crucial for persisting state and handling potential conflicts during netlink dumps. All the variables used here look like they are correctly initialized or initialized as local variables and the struct fields are also initialized. Now, I'm shifting gears to `nf_ct_seqadj_reset`. This looks like it's designed to reset the sequence adjustment data associated with a connection. The function receives a `nf_conn` (connection) structure and a `ctinfo` (conntrack info) as parameters. The logic retrieves a `nf_conn_seqadj` structure using `nfct_seqadj(ct)` and checks whether the `seqadj` pointer is valid. It then acquires a spinlock and resets the `offset_before` and `offset_after` fields within the relevant `nf_ct_seqadj` structure. My immediate question now is: What were the original assumptions and initialization procedures that necessitated the addition of `nf_ct_seqadj_reset`? I need to understand why this reset function exists and what state it's specifically meant to clean up. Therefore, I will now dive into `net/netfilter/nf_conntrack_seqadj.c` to trace the history and context around `nf_ct_seqadj_init` and understand the rationale behind the reset operation. |
| 50/3 | 2026/09/29 01:16 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nf_conntrack_seqadj.c",
"FirstLine": 1,
"LineCount": 40
}Results: {
"Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0-only\n 2:\t#include \u003clinux/types.h\u003e\n 3:\t#include \u003clinux/netfilter.h\u003e\n 4:\t#include \u003cnet/tcp.h\u003e\n 5:\t\n 6:\t#include \u003cnet/netfilter/nf_conntrack.h\u003e\n 7:\t#include \u003cnet/netfilter/nf_conntrack_extend.h\u003e\n 8:\t#include \u003cnet/netfilter/nf_conntrack_seqadj.h\u003e\n 9:\t\n 10:\tint nf_ct_seqadj_init(struct nf_conn *ct, enum ip_conntrack_info ctinfo,\n 11:\t\t\t s32 off)\n 12:\t{\n 13:\t\tstruct nf_conn_seqadj *seqadj = nfct_seqadj(ct);\n 14:\t\tenum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);\n 15:\t\tstruct nf_ct_seqadj *this_way;\n 16:\t\n 17:\t\tif (off == 0)\n 18:\t\t\treturn 0;\n 19:\t\n 20:\t\tif (unlikely(!seqadj))\n 21:\t\t\treturn 0;\n 22:\t\n 23:\t\tset_bit(IPS_SEQ_ADJUST_BIT, \u0026ct-\u003estatus);\n 24:\t\n 25:\t\tspin_lock_bh(\u0026ct-\u003elock);\n 26:\t\tthis_way = \u0026seqadj-\u003eseq[dir];\n 27:\t\tthis_way-\u003eoffset_before\t = off;\n 28:\t\tthis_way-\u003eoffset_after\t = off;\n 29:\t\tspin_unlock_bh(\u0026ct-\u003elock);\n 30:\t\treturn 0;\n 31:\t}\n 32:\tEXPORT_SYMBOL_GPL(nf_ct_seqadj_init);\n 33:\t\n 34:\tvoid nf_ct_seqadj_reset(struct nf_conn *ct, enum ip_conntrack_info ctinfo)\n 35:\t{\n 36:\t\tstruct nf_conn_seqadj *seqadj = nfct_seqadj(ct);\n 37:\t\tenum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);\n 38:\t\tstruct nf_ct_seqadj *this_way;\n 39:\t\n 40:\t\tif (unlikely(!seqadj))\n"
} |
| 51/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 26859 output: 37 thoughts: 178 Thoughts: **My Assessment of the Sequence Adjustment Code** Okay, let's break this down. That `nf_ct_seqadj_init` function... a quick glance at the code reveals a significant oversight. When `off` is zero, which is the case when called from `nf_synproxy_core.c` like `nf_ct_seqadj_init(ct, ctinfo, 0)`, the function *immediately* returns zero! That's it, a complete no-op. It does absolutely nothing. No setup, no initialization, nothing. So, the introduction of `nf_ct_seqadj_reset` suddenly makes perfect sense. It was added because `nf_ct_seqadj_init` failed to properly initialize the `offset_before` and `offset_after` values to zero in the first place. `nf_ct_seqadj_reset` has to explicitly set them to 0. Now, I need to check how this sequence adjustment mechanism is used in other parts of the network stack. I'll take a look at `net/sched/act_ct.c` and `nf_flow_table_core.c` to see how it's actually integrated in the overall data flow management. Specifically, I'm starting my analysis of `net/sched/act_ct.c` around line 349. I need to understand the wider implications of this initialization quirk. |
| 52/3 | 2026/09/29 01:16 | tool | read-file |
0mArgs:{
"File": "net/sched/act_ct.c",
"FirstLine": 340,
"LineCount": 35
}Results: {
"Contents": " 340:\t\tif (!ct_ft)\n 341:\t\t\tgoto err_alloc;\n 342:\t\trefcount_set(\u0026ct_ft-\u003eref, 1);\n 343:\t\n 344:\t\tct_ft-\u003ekey = key;\n 345:\t\terr = rhashtable_insert_fast(\u0026zones_ht, \u0026ct_ft-\u003enode, zones_params);\n 346:\t\tif (err)\n 347:\t\t\tgoto err_insert;\n 348:\t\n 349:\t\tct_ft-\u003enf_ft.type = \u0026flowtable_ct;\n 350:\t\tct_ft-\u003enf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |\n 351:\t\t\t\t NF_FLOWTABLE_COUNTER;\n 352:\t\twrite_pnet(\u0026ct_ft-\u003enf_ft.net, net);\n 353:\t\terr = nf_flow_table_init(\u0026ct_ft-\u003enf_ft);\n 354:\t\tif (err)\n 355:\t\t\tgoto err_init;\n 356:\t\n 357:\t\t__module_get(THIS_MODULE);\n 358:\tout_unlock:\n 359:\t\tparams-\u003ect_ft = ct_ft;\n 360:\t\tparams-\u003enf_ft = \u0026ct_ft-\u003enf_ft;\n 361:\t\tmutex_unlock(\u0026zones_mutex);\n 362:\t\n 363:\t\treturn 0;\n 364:\t\n 365:\terr_init:\n 366:\t\trhashtable_remove_fast(\u0026zones_ht, \u0026ct_ft-\u003enode, zones_params);\n 367:\terr_insert:\n 368:\t\tkfree(ct_ft);\n 369:\terr_alloc:\n 370:\t\tmutex_unlock(\u0026zones_mutex);\n 371:\t\treturn err;\n 372:\t}\n 373:\t\n 374:\tstatic void tcf_ct_flow_table_get_ref(struct tcf_ct_flow_table *ct_ft)\n"
} |
| 53/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 27923 output: 33 thoughts: 115 Thoughts: **Analyzing the net/sched/act_ct.c Change** Okay, let's break this down. I'm looking at a change in `net/sched/act_ct.c` and something immediately jumps out. Specifically, the placement of `write_pnet(&ct_ft->nf_ft.net, net);` has been shifted relative to `nf_flow_table_init(&ct_ft->nf_ft)`. Before, the `write_pnet` call was *after* the initialization of the flow table (`nf_flow_table_init`), but now it's *before*. Hmm, that's not something you do without a specific reason, and it changes the order of operations. I need to understand *why* this was changed. My gut tells me there's a dependency or timing issue that they are addressing, or perhaps an optimization around initialization, or some net namespace related thing. To figure this out, I'm heading directly to the definition of `nf_flow_table_init` in `net/netfilter/nf_flow_table_core.c`. I need to see what that function does to understand if the change in order of the lines is valid or not. I'll need to check the interactions with the net namespace. Let's dig in. |
| 54/3 | 2026/09/29 01:16 | tool | grepper |
0mArgs:{
"Expression": "int nf_flow_table_init",
"PathPrefix": "net/netfilter/"
}Results: {
"Output": "net/netfilter/nf_flow_table_core.c=709=EXPORT_SYMBOL_GPL(nf_flow_dnat_port);\nnet/netfilter/nf_flow_table_core.c-710-\nnet/netfilter/nf_flow_table_core.c:711:int nf_flow_table_init(struct nf_flowtable *flowtable)\nnet/netfilter/nf_flow_table_core.c-712-{\n--\nnet/netfilter/nf_flow_table_core.c=781=EXPORT_SYMBOL_GPL(nf_flow_table_free);\nnet/netfilter/nf_flow_table_core.c-782-\nnet/netfilter/nf_flow_table_core.c:783:static int nf_flow_table_init_net(struct net *net)\nnet/netfilter/nf_flow_table_core.c-784-{\n--\nnet/netfilter/nf_flow_table_procfs.c=60=static const struct seq_operations nf_flow_table_cpu_seq_ops = {\n--\nnet/netfilter/nf_flow_table_procfs.c-66-\nnet/netfilter/nf_flow_table_procfs.c:67:int nf_flow_table_init_proc(struct net *net)\nnet/netfilter/nf_flow_table_procfs.c-68-{\n"
} |
| 55/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 28711 output: 42 thoughts: 30 Thoughts: Okay, here's my interpretation of that thought process, assuming I'm already quite familiar with networking internals: **Diving into the Flow Table Initialization** Alright, time to dig into the heart of the matter. I'm thinking I need to refresh my understanding of how this Netfilter flow table actually gets off the ground. Let's start by cracking open the `nf_flow_table_init` function. I know it's located in `net/netfilter/nf_flow_table_core.c`, so I'll go right to it. I want to see how the core data structures are allocated and initialized, how the hooks are registered, and generally get a feel for the fundamental setup of the flow table module. I'm expecting this function to be the gateway to understanding the behavior of the netfilter flow table from the bottom up. |
| 56/3 | 2026/09/29 01:16 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nf_flow_table_core.c",
"FirstLine": 710,
"LineCount": 40
}Results: {
"Contents": " 710:\t\n 711:\tint nf_flow_table_init(struct nf_flowtable *flowtable)\n 712:\t{\n 713:\t\tint err;\n 714:\t\n 715:\t\tINIT_DELAYED_WORK(\u0026flowtable-\u003egc_work, nf_flow_offload_work_gc);\n 716:\t\tflow_block_init(\u0026flowtable-\u003eflow_block);\n 717:\t\tinit_rwsem(\u0026flowtable-\u003eflow_block_lock);\n 718:\t\n 719:\t\terr = rhashtable_init(\u0026flowtable-\u003erhashtable,\n 720:\t\t\t\t \u0026nf_flow_offload_rhash_params);\n 721:\t\tif (err \u003c 0)\n 722:\t\t\treturn err;\n 723:\t\n 724:\t\tqueue_delayed_work(system_power_efficient_wq,\n 725:\t\t\t\t \u0026flowtable-\u003egc_work, HZ);\n 726:\t\n 727:\t\tmutex_lock(\u0026flowtable_lock);\n 728:\t\tlist_add(\u0026flowtable-\u003elist, \u0026flowtables);\n 729:\t\tmutex_unlock(\u0026flowtable_lock);\n 730:\t\n 731:\t\treturn 0;\n 732:\t}\n 733:\tEXPORT_SYMBOL_GPL(nf_flow_table_init);\n 734:\t\n 735:\tstatic void nf_flow_table_do_cleanup(struct nf_flowtable *flow_table,\n 736:\t\t\t\t\t struct flow_offload *flow, void *data)\n 737:\t{\n 738:\t\tstruct net_device *dev = data;\n 739:\t\n 740:\t\tif (!dev ||\n 741:\t\t flow-\u003etuplehash[0].tuple.iifidx == dev-\u003eifindex ||\n 742:\t\t flow-\u003etuplehash[1].tuple.iifidx == dev-\u003eifindex)\n 743:\t\t\tflow_offload_teardown(flow);\n 744:\t}\n 745:\t\n 746:\tvoid nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable,\n 747:\t\t\t\t struct net_device *dev)\n 748:\t{\n 749:\t\tnf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev);\n"
} |
| 57/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 29598 output: 21 thoughts: 690 Thoughts: **Potential Race Condition Detected in Flow Table Initialization**
Okay, here's what's bothering me. I was looking at lines 727-729, specifically:
```c
mutex_lock(&flowtable_lock);
list_add(&flowtable->list, &flowtables);
mutex_unlock(&flowtable_lock);
```
This `nf_flow_table_init` function is adding a `flowtable` to the global `flowtables` list. That alone isn't necessarily a problem, but it's the sequence of operations that's making me concerned. Now, looking at `nf_flow_table_cleanup(dev)`:
```c
void nf_flow_table_cleanup(struct net_device *dev)
{
struct nf_flowtable *flowtable;
mutex_lock(&flowtable_lock);
list_for_each_entry(flowtable, &flowtables, list) {
if (net_eq(read_pnet(&flowtable->net), dev_net(dev)))
nf_flow_table_gc_cleanup(flowtable, dev);
}
mutex_unlock(&flowtable_lock);
}
```
My concern is that if `write_pnet(&ct_ft->nf_ft.net, net)` *happens* after `nf_flow_table_init(&ct_ft->nf_ft)`, then the following scenario occurs: immediately after `list_add(&flowtable->list, &flowtables)` is called, `nf_flow_table_cleanup()` might iterate the `flowtables` list and call `read_pnet(&flowtable->net)`. If this is the case, then this would be reading an uninitialized or zeroed `flowtable->net` value, which could result in incorrect behavior.
Hold on, let me verify if `read_pnet(&flowtable->net)` was newly added in this patch to `nf_flow_table_cleanup`.
(Looking at the diff)
Aha! The commit *did* introduce `net_eq(read_pnet(&flowtable->net), dev_net(dev))` within `nf_flow_table_cleanup`. And I see that in the corresponding changes in `act_ct.c`, `write_pnet(&ct_ft->nf_ft.net, net);` was moved before `nf_flow_table_init(&ct_ft->nf_ft)`.
But now I have another thought! What if another caller of `nf_flow_table_init` *doesn't* initialize `flowtable->net` or does it differently? I better do a grep on `nf_flow_table_init` in the kernel source to be sure.
|
| 58/3 | 2026/09/29 01:16 | tool | grepper |
0mArgs:{
"Expression": "nf_flow_table_init"
}Results: {
"Output": "include/net/netfilter/nf_flow_table.h=326=void nf_flow_table_cleanup(struct net_device *dev);\ninclude/net/netfilter/nf_flow_table.h-327-\ninclude/net/netfilter/nf_flow_table.h:328:int nf_flow_table_init(struct nf_flowtable *flow_table);\ninclude/net/netfilter/nf_flow_table.h-329-void nf_flow_table_free(struct nf_flowtable *flow_table);\n--\ninclude/net/netfilter/nf_flow_table.h=408=static inline bool nf_flow_pppoe_proto(struct sk_buff *skb, __be16 *inner_proto)\n--\ninclude/net/netfilter/nf_flow_table.h-425-#ifdef CONFIG_NF_FLOW_TABLE_PROCFS\ninclude/net/netfilter/nf_flow_table.h:426:int nf_flow_table_init_proc(struct net *net);\ninclude/net/netfilter/nf_flow_table.h-427-void nf_flow_table_fini_proc(struct net *net);\ninclude/net/netfilter/nf_flow_table.h-428-#else\ninclude/net/netfilter/nf_flow_table.h:429:static inline int nf_flow_table_init_proc(struct net *net)\ninclude/net/netfilter/nf_flow_table.h-430-{\n--\nnet/netfilter/nf_flow_table_core.c=709=EXPORT_SYMBOL_GPL(nf_flow_dnat_port);\nnet/netfilter/nf_flow_table_core.c-710-\nnet/netfilter/nf_flow_table_core.c:711:int nf_flow_table_init(struct nf_flowtable *flowtable)\nnet/netfilter/nf_flow_table_core.c-712-{\n--\nnet/netfilter/nf_flow_table_core.c-732-}\nnet/netfilter/nf_flow_table_core.c:733:EXPORT_SYMBOL_GPL(nf_flow_table_init);\nnet/netfilter/nf_flow_table_core.c-734-\n--\nnet/netfilter/nf_flow_table_core.c=781=EXPORT_SYMBOL_GPL(nf_flow_table_free);\nnet/netfilter/nf_flow_table_core.c-782-\nnet/netfilter/nf_flow_table_core.c:783:static int nf_flow_table_init_net(struct net *net)\nnet/netfilter/nf_flow_table_core.c-784-{\n--\nnet/netfilter/nf_flow_table_core.c=794=static int nf_flow_table_pernet_init(struct net *net)\n--\nnet/netfilter/nf_flow_table_core.c-797-\nnet/netfilter/nf_flow_table_core.c:798:\tret = nf_flow_table_init_net(net);\nnet/netfilter/nf_flow_table_core.c-799-\tif (ret \u003c 0)\n--\nnet/netfilter/nf_flow_table_core.c-801-\nnet/netfilter/nf_flow_table_core.c:802:\tret = nf_flow_table_init_proc(net);\nnet/netfilter/nf_flow_table_core.c-803-\tif (ret \u003c 0)\n--\nnet/netfilter/nf_flow_table_inet.c=68=static struct nf_flowtable_type flowtable_inet = {\nnet/netfilter/nf_flow_table_inet.c-69-\t.family\t\t= NFPROTO_INET,\nnet/netfilter/nf_flow_table_inet.c:70:\t.init\t\t= nf_flow_table_init,\nnet/netfilter/nf_flow_table_inet.c-71-\t.setup\t\t= nf_flow_table_offload_setup,\n--\nnet/netfilter/nf_flow_table_inet.c=78=static struct nf_flowtable_type flowtable_ipv4 = {\nnet/netfilter/nf_flow_table_inet.c-79-\t.family\t\t= NFPROTO_IPV4,\nnet/netfilter/nf_flow_table_inet.c:80:\t.init\t\t= nf_flow_table_init,\nnet/netfilter/nf_flow_table_inet.c-81-\t.setup\t\t= nf_flow_table_offload_setup,\n--\nnet/netfilter/nf_flow_table_inet.c=88=static struct nf_flowtable_type flowtable_ipv6 = {\nnet/netfilter/nf_flow_table_inet.c-89-\t.family\t\t= NFPROTO_IPV6,\nnet/netfilter/nf_flow_table_inet.c:90:\t.init\t\t= nf_flow_table_init,\nnet/netfilter/nf_flow_table_inet.c-91-\t.setup\t\t= nf_flow_table_offload_setup,\n--\nnet/netfilter/nf_flow_table_procfs.c=60=static const struct seq_operations nf_flow_table_cpu_seq_ops = {\n--\nnet/netfilter/nf_flow_table_procfs.c-66-\nnet/netfilter/nf_flow_table_procfs.c:67:int nf_flow_table_init_proc(struct net *net)\nnet/netfilter/nf_flow_table_procfs.c-68-{\n--\nnet/sched/act_ct.c=324=static int tcf_ct_flow_table_get(struct net *net, struct tcf_ct_params *params)\n--\nnet/sched/act_ct.c-352-\twrite_pnet(\u0026ct_ft-\u003enf_ft.net, net);\nnet/sched/act_ct.c:353:\terr = nf_flow_table_init(\u0026ct_ft-\u003enf_ft);\nnet/sched/act_ct.c-354-\tif (err)\n"
} |
| 59/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 32466 output: 28 thoughts: 19 Thoughts: Here's my thought process, as if I were analyzing that question: **Tracing the Initialization of `nf_flowtable_type`** Okay, so the prompt wants me to figure out where `.init` is called for `nf_flowtable_type`. That's pretty straightforward, actually. The first thing I'd do is leverage my familiarity with the kernel's code base and the general structure of `netfilter`. I know that `nf_flowtable_type` is likely related to the Netfilter flow table module. My initial guess is that it would be registered somewhere during module initialization or perhaps during the boot process if it's built-in. Let me quickly use my preferred code exploration tools – likely `grep` or `cscope` – to search for the specific function pointer member. I'd be looking for something along the lines of `nf_flowtable_type.init` or `&nf_flowtable_type.init`, with appropriate wildcards to cover variations in code style. I'd pay attention to calls using the function pointer dereferencing operator (`->` or `.`) rather than looking for a direct declaration of the `.init` field. I need to be careful with the search as the actual instantiation may be indirect. I'd expect to find calls to a registration function like `module_init`, `late_initcall`, or similar constructs used to hook up initialization routines within the kernel. If it's a built-in module, I will search the source files and the corresponding `Kconfig` for the relevant entry. If it's a loadable module, then I need to find the `module_init` inside of the module source. The results from the search should quickly pinpoint the callsite. I'd then carefully review the surrounding code to understand the context of this initialization. I'm looking for details about when it's called, what conditions trigger it, and any other relevant setup that occurs before or after `.init` is executed. My experience tells me there might be a dependency chain, so I'd have to follow the logic if the initial find isn't immediately obvious. Once I have the callsite, I'm confident I can quickly understand what's happening. |
| 60/3 | 2026/09/29 01:16 | tool | grepper |
0mArgs:{
"Expression": "-\u003einit\\(",
"PathPrefix": "net/netfilter/"
}Results: {
"Output": "net/netfilter/ipvs/ip_vs_proto.c=48=static int __used __init register_ip_vs_protocol(struct ip_vs_protocol *pp)\n--\nnet/netfilter/ipvs/ip_vs_proto.c-55-\tif (pp-\u003einit != NULL)\nnet/netfilter/ipvs/ip_vs_proto.c:56:\t\tpp-\u003einit(pp);\nnet/netfilter/ipvs/ip_vs_proto.c-57-\n--\nnet/netfilter/nf_tables_api.c=3638=static int nf_tables_newexpr(const struct nft_ctx *ctx,\n--\nnet/netfilter/nf_tables_api.c-3646-\tif (ops-\u003einit) {\nnet/netfilter/nf_tables_api.c:3647:\t\terr = ops-\u003einit(ctx, expr, (const struct nlattr **)expr_info-\u003etb);\nnet/netfilter/nf_tables_api.c-3648-\t\tif (err \u003c 0)\n--\nnet/netfilter/nf_tables_api.c=5440=static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,\n--\nnet/netfilter/nf_tables_api.c-5709-\nnet/netfilter/nf_tables_api.c:5710:\terr = ops-\u003einit(set, \u0026desc, nla);\nnet/netfilter/nf_tables_api.c-5711-\tif (err \u003c 0)\n--\nnet/netfilter/nf_tables_api.c=8165=static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,\n--\nnet/netfilter/nf_tables_api.c-8201-\nnet/netfilter/nf_tables_api.c:8202:\terr = ops-\u003einit(ctx, (const struct nlattr * const *)tb, obj);\nnet/netfilter/nf_tables_api.c-8203-\tif (err \u003c 0)\n--\nnet/netfilter/nf_tables_api.c=9215=static int nf_tables_newflowtable(struct sk_buff *skb,\n--\nnet/netfilter/nf_tables_api.c-9299-\tflowtable-\u003edata.type = type;\nnet/netfilter/nf_tables_api.c:9300:\terr = type-\u003einit(\u0026flowtable-\u003edata);\nnet/netfilter/nf_tables_api.c-9301-\tif (err \u003c 0)\n--\nnet/netfilter/nfnetlink_queue.c=1562=static void nfqnl_nf_hook_drop(struct net *net)\n--\nnet/netfilter/nfnetlink_queue.c-1567-\t/* This function is also called on net namespace error unwind,\nnet/netfilter/nfnetlink_queue.c:1568:\t * when pernet_ops-\u003einit() failed and -\u003eexit() functions of the\nnet/netfilter/nfnetlink_queue.c-1569-\t * previous pernet_ops gets called.\n--\nnet/netfilter/nft_inner.c=335=static int nft_inner_init(const struct nft_ctx *ctx,\n--\nnet/netfilter/nft_inner.c-386-\nnet/netfilter/nft_inner.c:387:\terr = expr_info.ops-\u003einit(ctx, (struct nft_expr *)\u0026priv-\u003eexpr,\nnet/netfilter/nft_inner.c-388-\t\t\t\t (const struct nlattr * const*)expr_info.tb);\n"
} |
| 61/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 33902 output: 41 thoughts: 39 Thoughts: Here's a breakdown of my thought process: **Diving into nf_tables_newflowtable** Alright, time to dig into this. I need to refresh my memory on the specifics of `nf_tables_newflowtable`. Let's zero in on that function's implementation within `net/netfilter/nf_tables_api.c`. My focus is the section between lines 9280 and 9310. I'll need to meticulously examine this segment to see what's happening. I'm looking for the key logic, any potential gotchas, and how it all hangs together. Got to trace exactly how a new flowtable is created within the netfilter framework. |
| 62/3 | 2026/09/29 01:16 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nf_tables_api.c",
"FirstLine": 9280,
"LineCount": 35
}Results: {
"Contents": "9280:\t\t\tgoto err1;\n9281:\t\t}\n9282:\t\n9283:\t\ttype = nft_flowtable_type_get(net, family);\n9284:\t\tif (IS_ERR(type)) {\n9285:\t\t\terr = PTR_ERR(type);\n9286:\t\t\tgoto err2;\n9287:\t\t}\n9288:\t\n9289:\t\tif (nla[NFTA_FLOWTABLE_FLAGS]) {\n9290:\t\t\tflowtable-\u003edata.flags =\n9291:\t\t\t\tntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));\n9292:\t\t\tif (flowtable-\u003edata.flags \u0026 ~NFT_FLOWTABLE_MASK) {\n9293:\t\t\t\terr = -EOPNOTSUPP;\n9294:\t\t\t\tgoto err3;\n9295:\t\t\t}\n9296:\t\t}\n9297:\t\n9298:\t\twrite_pnet(\u0026flowtable-\u003edata.net, net);\n9299:\t\tflowtable-\u003edata.type = type;\n9300:\t\terr = type-\u003einit(\u0026flowtable-\u003edata);\n9301:\t\tif (err \u003c 0)\n9302:\t\t\tgoto err3;\n9303:\t\n9304:\t\terr = nft_flowtable_parse_hook(\u0026ctx, nla, \u0026flowtable_hook, flowtable,\n9305:\t\t\t\t\t extack, true);\n9306:\t\tif (err \u003c 0)\n9307:\t\t\tgoto err_flowtable_parse_hooks;\n9308:\t\n9309:\t\tlist_splice(\u0026flowtable_hook.list, \u0026flowtable-\u003ehook_list);\n9310:\t\tflowtable-\u003edata.priority = flowtable_hook.priority;\n9311:\t\tflowtable-\u003ehooknum = flowtable_hook.num;\n9312:\t\n9313:\t\ttrans = nft_trans_flowtable_add(\u0026ctx, NFT_MSG_NEWFLOWTABLE, flowtable);\n9314:\t\tif (IS_ERR(trans)) {\n"
} |
| 63/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 34682 output: 41 thoughts: 692 Thoughts: **Analyzing the `nf_tables_newflowtable` Patch for KMSAN Concerns**
Okay, so I've been looking at this patch for `nf_tables_newflowtable`. The key change seems to be moving `write_pnet(&flowtable->data.net, net);` *before* `type->init(&flowtable->data);` in `nf_tables_newflowtable`. That's a pretty straightforward fix, actually. Previously, in the `act_ct.c` code, the `net` was written after the flowtable init. This ensures the `flowtable->net` is initialized *before* being added to the list, which elegantly avoids a potential race condition. If a `cleanup` happened concurrently, this could have resulted in a read before write.
Now, let's get down to the KMSAN business. I need to make sure this doesn't introduce any uninitialized memory reads. I'll step through those four criteria:
1. **Kernel structures to userspace:** My immediate thought is, are there any kernel structures sent to userspace through things like `copy_to_user`, `put_user`, netlink, `ioctl`, or BPF buffers? I need to check for any uninitialized fields.
2. **Conditional logic based on uninitialized data:** Are there any new conditional statements or branching logic that now depend on potentially uninitialized variables or struct fields introduced by this change?
3. **Allocation/Initialization of Complex Data Structures:** Does the patch allocate or initialize anything complex where fields could be read later through a reachable code path?
4. **Bounds checks allowing uninitialized bytes access:** I'll look closely to see if bounds checks, lengths, or logic have changed in a way that could allow surrounding code to read uninitialized bytes from existing buffers.
So, let's get specific. I need to see if the patch touches any netlink code, or copies anything to userspace.
Okay, I see `nfnetlink_hook.c` is included. Let me review the changes there. Specifically, I see a function `nfnl_hook_dump_nat`. Let's dig into that `nfnl_hook_dump_nat` function.
I see this loop and function call `nfnl_hook_dump_one`:
```c
for (; i < e->num_hook_entries; i++) {
err = nfnl_hook_dump_one(nlskb, ctx,
READ_ONCE(nat_ops[i]),
ops->priority, family,
cb->nlh->nlmsg_seq);
if (err)
break;
}
```
Now, I need to check `nfnl_hook_dump_one` very carefully. Does *that* function send any potentially uninitialized data to userspace? That's the critical piece here. I'll read that function and keep my eye out for anything that looks suspicious.
|
| 64/3 | 2026/09/29 01:16 | tool | grepper |
0mArgs:{
"Expression": "nfnl_hook_dump_one",
"PathPrefix": "net/netfilter/nfnetlink_hook.c"
}Results: {
"Output": "net/netfilter/nfnetlink_hook.c=158=static int nfnl_hook_put_nft_ft_info(struct sk_buff *nlskb,\n--\nnet/netfilter/nfnetlink_hook.c-189-\nnet/netfilter/nfnetlink_hook.c:190:static int nfnl_hook_dump_one(struct sk_buff *nlskb,\nnet/netfilter/nfnetlink_hook.c-191-\t\t\t const struct nfnl_dump_hook_data *ctx,\n--\nnet/netfilter/nfnetlink_hook.c=339=static int nfnl_hook_dump_nat(struct sk_buff *nlskb,\n--\nnet/netfilter/nfnetlink_hook.c-360-\tfor (; i \u003c e-\u003enum_hook_entries; i++) {\nnet/netfilter/nfnetlink_hook.c:361:\t\terr = nfnl_hook_dump_one(nlskb, ctx,\nnet/netfilter/nfnetlink_hook.c-362-\t\t\t\t\t READ_ONCE(nat_ops[i]),\n--\nnet/netfilter/nfnetlink_hook.c=383=static int nfnl_hook_dump(struct sk_buff *nlskb,\n--\nnet/netfilter/nfnetlink_hook.c-408-\t\t} else {\nnet/netfilter/nfnetlink_hook.c:409:\t\t\terr = nfnl_hook_dump_one(nlskb, ctx, cur,\nnet/netfilter/nfnetlink_hook.c-410-\t\t\t\t\t\t cur-\u003epriority, family,\n"
} |
| 65/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 36486 output: 40 thoughts: 40 Thoughts: Okay, let's dive into this. I need to understand what's happening with `nfnl_hook_dump_one`. Specifically, I want to zero in on lines 190 through 280 in `net/netfilter/nfnetlink_hook.c`. My immediate goal is to understand how this function is dumping the relevant data for Netfilter hooks. I expect to see the code that walks the chain, perhaps serializes the hook information, and prepares the data for the netlink message. I'm looking for the core logic here, the crucial steps of the dump operation. I'm already anticipating some of the usual suspects: memory allocation, data structure traversal, and serialization routines. I'll need to pay close attention to the error handling and potential race conditions as well. Knowing my Netfilter, I'm prepared for intricate logic and the usual complexity associated with asynchronous operations. I'm keen to isolate the logic that prepares each individual hook for the dump process – that's where the critical aspects of the function should be. |
| 66/3 | 2026/09/29 01:16 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nfnetlink_hook.c",
"FirstLine": 190,
"LineCount": 80
}Results: {
"Contents": " 190:\tstatic int nfnl_hook_dump_one(struct sk_buff *nlskb,\n 191:\t\t\t\t const struct nfnl_dump_hook_data *ctx,\n 192:\t\t\t\t const struct nf_hook_ops *ops, int priority,\n 193:\t\t\t\t int family, unsigned int seq)\n 194:\t{\n 195:\t\tu16 event = nfnl_msg_type(NFNL_SUBSYS_HOOK, NFNL_MSG_HOOK_GET);\n 196:\t\tunsigned int portid = NETLINK_CB(nlskb).portid;\n 197:\t\tstruct nlmsghdr *nlh;\n 198:\t\tint ret = -EMSGSIZE;\n 199:\t\tu32 hooknum;\n 200:\t#ifdef CONFIG_KALLSYMS\n 201:\t\tchar sym[KSYM_SYMBOL_LEN];\n 202:\t\tchar *module_name;\n 203:\t#endif\n 204:\t\tnlh = nfnl_msg_put(nlskb, portid, seq, event,\n 205:\t\t\t\t NLM_F_MULTI, family, NFNETLINK_V0, 0);\n 206:\t\tif (!nlh)\n 207:\t\t\tgoto nla_put_failure;\n 208:\t\n 209:\t#ifdef CONFIG_KALLSYMS\n 210:\t\tret = snprintf(sym, sizeof(sym), \"%ps\", ops-\u003ehook);\n 211:\t\tif (ret \u003e= sizeof(sym)) {\n 212:\t\t\tret = -EINVAL;\n 213:\t\t\tgoto nla_put_failure;\n 214:\t\t}\n 215:\t\n 216:\t\tmodule_name = strstr(sym, \" [\");\n 217:\t\tif (module_name) {\n 218:\t\t\tchar *end;\n 219:\t\n 220:\t\t\t*module_name = '\\0';\n 221:\t\t\tmodule_name += 2;\n 222:\t\t\tend = strchr(module_name, ']');\n 223:\t\t\tif (end) {\n 224:\t\t\t\t*end = 0;\n 225:\t\n 226:\t\t\t\tret = nla_put_string(nlskb, NFNLA_HOOK_MODULE_NAME, module_name);\n 227:\t\t\t\tif (ret)\n 228:\t\t\t\t\tgoto nla_put_failure;\n 229:\t\t\t}\n 230:\t\t}\n 231:\t\n 232:\t\tret = nla_put_string(nlskb, NFNLA_HOOK_FUNCTION_NAME, sym);\n 233:\t\tif (ret)\n 234:\t\t\tgoto nla_put_failure;\n 235:\t#endif\n 236:\t\n 237:\t\tif (ops-\u003epf == NFPROTO_INET \u0026\u0026 ops-\u003ehooknum == NF_INET_INGRESS)\n 238:\t\t\thooknum = NF_NETDEV_INGRESS;\n 239:\t\telse\n 240:\t\t\thooknum = ops-\u003ehooknum;\n 241:\t\n 242:\t\tret = nla_put_be32(nlskb, NFNLA_HOOK_HOOKNUM, htonl(hooknum));\n 243:\t\tif (ret)\n 244:\t\t\tgoto nla_put_failure;\n 245:\t\n 246:\t\tret = nla_put_be32(nlskb, NFNLA_HOOK_PRIORITY, htonl(priority));\n 247:\t\tif (ret)\n 248:\t\t\tgoto nla_put_failure;\n 249:\t\n 250:\t\tswitch (ops-\u003ehook_ops_type) {\n 251:\t\tcase NF_HOOK_OP_NF_TABLES:\n 252:\t\t\tret = nfnl_hook_put_nft_chain_info(nlskb, ctx, seq, ops-\u003epriv);\n 253:\t\t\tbreak;\n 254:\t\tcase NF_HOOK_OP_BPF:\n 255:\t\t\tret = nfnl_hook_put_bpf_prog_info(nlskb, ctx, seq, ops-\u003epriv);\n 256:\t\t\tbreak;\n 257:\t\tcase NF_HOOK_OP_NFT_FT:\n 258:\t\t\tret = nfnl_hook_put_nft_ft_info(nlskb, ctx, seq, ops-\u003epriv);\n 259:\t\t\tbreak;\n 260:\t\tcase NF_HOOK_OP_UNDEFINED:\n 261:\t\t\tbreak;\n 262:\t\tdefault:\n 263:\t\t\tWARN_ON_ONCE(1);\n 264:\t\t\tbreak;\n 265:\t\t}\n 266:\t\n 267:\t\tif (ret)\n 268:\t\t\tgoto nla_put_failure;\n 269:\t\n"
} |
| 67/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 38059 output: 32 thoughts: 201 Thoughts: **My Analysis of the Netlink Changes** Okay, so `nfnl_hook_dump_one` was already in place, untouched. The real meat of the changes seems to be in `nfnl_hook_dump` and `nfnl_hook_dump_nat`. The key difference I'm seeing is the direct passing of `cur->priority` instead of `ops[i]->priority`, alongside the consistency sequence adjustments (`base_seq`, `cb->seq`), and the index 0/1 handling. That’s solid, logical change. Now, I need to understand the impact of this within the broader context. Let's dig into `net/netfilter/nf_conntrack_netlink.c` and specifically focus on `CTA_FILTER_ZONE`. The immediate question that I need answered is: is this field, or anything related to it, ever copied or transmitted to userspace? That's the critical piece. I need to understand the data flow. My gut tells me this is related to filtering or dumping of conntrack entries via Netlink. So, let me scrutinize `ctnetlink_dump_filter` and the surrounding code, places where the filtering logic is actually emitted, where conntrack entries get dumped. Hold on…the filter is used for *filtering* GET/DUMP requests *from* userspace. That’s right, it’s about user-specified filtering. Okay, so now I need to trace back from that. I'm going to follow the call stack and see where `ctnetlink_alloc_filter` is called, because that's where the filter is being initialized. That's the starting point. |
| 68/3 | 2026/09/29 01:16 | tool | grepper |
0mArgs:{
"Expression": "ctnetlink_alloc_filter",
"PathPrefix": "net/netfilter/"
}Results: {
"Output": "net/netfilter/nf_conntrack_netlink.c=988=static struct ctnetlink_filter *\nnet/netfilter/nf_conntrack_netlink.c:989:ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)\nnet/netfilter/nf_conntrack_netlink.c-990-{\n--\nnet/netfilter/nf_conntrack_netlink.c=1077=static int ctnetlink_start(struct netlink_callback *cb)\n--\nnet/netfilter/nf_conntrack_netlink.c-1084-\tif (ctnetlink_needs_filter(family, cda)) {\nnet/netfilter/nf_conntrack_netlink.c:1085:\t\tfilter = ctnetlink_alloc_filter(cda, family);\nnet/netfilter/nf_conntrack_netlink.c-1086-\t\tif (IS_ERR(filter))\n--\nnet/netfilter/nf_conntrack_netlink.c=1601=static int ctnetlink_flush_conntrack(struct net *net,\n--\nnet/netfilter/nf_conntrack_netlink.c-1612-\tif (ctnetlink_needs_filter(family, cda)) {\nnet/netfilter/nf_conntrack_netlink.c:1613:\t\tfilter = ctnetlink_alloc_filter(cda, family);\nnet/netfilter/nf_conntrack_netlink.c-1614-\t\tif (IS_ERR(filter))\n"
} |
| 69/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 39058 output: 32 thoughts: 76 Thoughts: Okay, let's break this down. **Analyzing the `ctnetlink_filter` Allocation and Usage** Alright, so the first thing I'm noting is that this `ctnetlink_filter` struct is being allocated using `kzalloc_obj(*filter)`. That immediately tells me it's zero-initialized, which, depending on its fields, could be important for filtering logic later on. Memory allocation and initialization are always good starting points for understanding a structure's lifecycle. Next, I see it's being employed within `ctnetlink_dump_table` and `ctnetlink_flush_conntrack`. Ah, right, that's where the filtering functionality comes in. So, it's used to match specific conntrack entries during dumping and flushing operations. This aligns with what I'd expect; filters are typically used to refine the results of those operations. I need to keep this relationship in mind. Finally, the `ctnetlink_needs_filter` function catches my eye. Naturally, I need to see what this function does. My guess is it will be a key piece in determining when a filter should be used. The logic of `ctnetlink_needs_filter` will likely provide further context to these operations. |
| 70/3 | 2026/09/29 01:16 | tool | grepper |
0mArgs:{
"Expression": "ctnetlink_needs_filter",
"PathPrefix": "net/netfilter/"
}Results: {
"Output": "net/netfilter/nf_conntrack_netlink.c=989=ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)\n--\nnet/netfilter/nf_conntrack_netlink.c-1071-\nnet/netfilter/nf_conntrack_netlink.c:1072:static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)\nnet/netfilter/nf_conntrack_netlink.c-1073-{\n--\nnet/netfilter/nf_conntrack_netlink.c=1077=static int ctnetlink_start(struct netlink_callback *cb)\n--\nnet/netfilter/nf_conntrack_netlink.c-1083-\nnet/netfilter/nf_conntrack_netlink.c:1084:\tif (ctnetlink_needs_filter(family, cda)) {\nnet/netfilter/nf_conntrack_netlink.c-1085-\t\tfilter = ctnetlink_alloc_filter(cda, family);\n--\nnet/netfilter/nf_conntrack_netlink.c=1601=static int ctnetlink_flush_conntrack(struct net *net,\n--\nnet/netfilter/nf_conntrack_netlink.c-1611-\nnet/netfilter/nf_conntrack_netlink.c:1612:\tif (ctnetlink_needs_filter(family, cda)) {\nnet/netfilter/nf_conntrack_netlink.c-1613-\t\tfilter = ctnetlink_alloc_filter(cda, family);\n"
} |
| 71/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 39862 output: 44 thoughts: 21 Thoughts: Okay, let's dive into this code. **Analyzing `ctnetlink_needs_filter`** Alright, I need to understand this `ctnetlink_needs_filter` function. Let's start by looking at its implementation around line 1070. What's it doing? Is it checking for something specific in the netlink context, the conntrack entry, or the message itself? I need to quickly identify the key variables it uses. Are there any obvious conditional branches? What's the general logic flow? This likely determines if some filtering is required before a netlink message for conntrack is handled. I need to keep in mind, in my expert view, that proper filtering is vital for security and resource management within the conntrack system. I have to grasp *why* this filtering might be needed in certain situations, or when it's circumvented for optimization. I'll need to remember the purpose of netlink here, as well. |
| 72/3 | 2026/09/29 01:16 | tool | read-file |
0mArgs:{
"File": "net/netfilter/nf_conntrack_netlink.c",
"FirstLine": 1065,
"LineCount": 20
}Results: {
"Contents": "1065:\t\n1066:\terr_filter:\n1067:\t\tkfree(filter);\n1068:\t\n1069:\t\treturn ERR_PTR(err);\n1070:\t}\n1071:\t\n1072:\tstatic bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)\n1073:\t{\n1074:\t\treturn family || cda[CTA_MARK] || cda[CTA_FILTER] || cda[CTA_STATUS] || cda[CTA_ZONE];\n1075:\t}\n1076:\t\n1077:\tstatic int ctnetlink_start(struct netlink_callback *cb)\n1078:\t{\n1079:\t\tconst struct nlattr * const *cda = cb-\u003edata;\n1080:\t\tstruct ctnetlink_filter *filter = NULL;\n1081:\t\tstruct nfgenmsg *nfmsg = nlmsg_data(cb-\u003enlh);\n1082:\t\tu8 family = nfmsg-\u003enfgen_family;\n1083:\t\n1084:\t\tif (ctnetlink_needs_filter(family, cda)) {\n"
} |
| 73/3 | 2026/09/29 01:16 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 40451 output: 382 thoughts: 2546 Thoughts: **KMSAN Assessment of Conntrack and Netfilter Changes**
Okay, let's break this down. The first thing I'm looking at is this `CTA_FILTER` stuff. It's already been vetted for the `ctnetlink_needs_filter` check, good. Now, in `ctnetlink_parse_filter`, the `CTA_FILTER_ZONE` attribute can trigger setting `filter->zone_filter` to true, and, *critically*, it checks that `CTA_ZONE` is also present if `zone_filter` is true, which triggers parsing `filter->zone`. That looks sound.
Next, I see a bug fix in `ctnetlink_filter_match_tuple` for IPv6 address comparison. The use of `ipv6_addr_equal` instead of `ipv6_addr_cmp` is definitely the right move. The logic was inverted previously: a "0" result from `ipv6_addr_cmp` meant equal, so `!0` (true) indicated *not* matching, so now this logic is correct.
Moving on, `nf_ct_seqadj_reset`. The change from `nf_ct_seqadj_init` to `nf_ct_seqadj_reset` appears to be clarifying the intent. The older function `nf_ct_seqadj_init` would have returned early if `off` was zero, leaving `seqadj` untouched. The new `nf_ct_seqadj_reset` *explicitly* zeros out `offset_before` and `offset_after`, ensuring a consistent initial state.
In `nf_flow_table_core.c`, the changes related to `nf_flow_table_do_cleanup` and `nf_flow_table_cleanup` seem to be ensuring that the flow table cleanup operates within the correct network namespace. The addition of the net check on `nf_flow_table_cleanup` is sound.
The modification in `net/sched/act_ct.c` is important: writing `ct_ft->nf_ft.net` before `nf_flow_table_init` now ensures that the network namespace of the flow table is initialized *before* it's added to the list and later cleaned up, as the list traversal relies on having a valid `flowtable->net`. This prevents any potential read-uninitialized issues.
The `bump_hook_base_seq` and `bump_nat_hook_base_seq` additions, along with the `net->nf.hook_base_seq = 1` initialization in `netfilter_net_init`, are all related to netlink dump synchronization. These are integer fields initialized to 1 and bumped monotonically to detect concurrent modifications during netlink dumps.
Finally, the update to statistics counters in `nf_conntrack_core.c` is straightforward – incrementing the `invalid` counter in the event of `NF_DROP` - correct behavior.
Now, the important part: Do any of these changes pose a risk of uninitialized memory issues that KMSAN would catch? Let's go through it systematically:
1. **Kernel Structures to Userspace?** No new structures are being sent to userspace. `nfnl_hook_dump_one` is unchanged concerning how it constructs skb attributes. The `CTA_FILTER_ZONE` attribute is received *from* userspace (in a netlink message) not sent to it.
2. **Conditional Logic & Uninitialized Variables?**
* `filter->zone_filter`: Allocated with `kzalloc_obj`, initialized to `false`. Set to `true` if the relevant attribute is present. Safe.
* `net->nf.hook_base_seq` and `nat_hook_base_seq`: Initialized to `1` during `netfilter_net_init`. This is *crucial*.
* `cb->args`: kernel netlink callback args array, initialized to 0. This is important to check.
* `seqadj->seq[dir]`: `offset_before` and `offset_after` are now *explicitly* set to zero. Excellent.
* `flowtable->net` initialization: The correct order of `write_pnet` and `init` eliminates the previously possible read-uninitialized scenario in `nf_flow_table_cleanup`.
3. **Allocation/Initialization of Complex Data Structures?** Nothing new jumps out.
4. **Bounds Checks/Lengths?** No. No changes to potentially expose uninitialized bytes.
So, the patch is:
* Does *not* introduce new kernel structures sent to userspace.
* *Properly* initializes or checks every potentially problematic variable.
|
| 74/3 | 2026/09/29 01:17 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch series touches several netfilter components:\n1. Adds `CTA_FILTER_ZONE` flag to conntrack netlink filtering (`net/netfilter/nf_conntrack_netlink.c`), where the filter structure is allocated with `kzalloc_obj` ensuring all fields are zero-initialized, and fixes IPv6 address comparison logic (`ipv6_addr_equal`).\n2. Introduces hook generation sequence counters (`hook_base_seq` and `nat_hook_base_seq`) to detect concurrent modifications during netlink dumps (`nfnetlink_hook.c`, `core.c`, `nf_nat_core.c`), both initialized to 1 in `netfilter_net_init`.\n3. Adds `nf_ct_seqadj_reset` to explicitly zero `offset_before` and `offset_after` under lock in `nf_conntrack_seqadj.c`.\n4. Fixes flowtable cleanup to filter by network namespace and moves `write_pnet(\u0026ct_ft-\u003enf_ft.net, net)` before `nf_flow_table_init` in `act_ct.c`, ensuring `flowtable-\u003enet` is initialized before being added to the global flowtables list.\n5. Minor conntrack statistics adjustments, dead code elimination, and comment/typo fixes.\n\nNone of the changes introduce uninitialized variables, expose struct padding or uninitialized buffers to user space, or alter buffer bounds in a way that allows reads of uninitialized memory. Standard KASAN, LOCKDEP, and syzkaller fuzzing are sufficient to detect memory corruption, race conditions, or lifetime issues. KMSAN is not required.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch series touches several netfilter components:\n1. Adds `CTA_FILTER_ZONE` flag to conntrack netlink filtering (`net/netfilter/nf_conntrack_netlink.c`), where the filter structure is allocated with `kzalloc_obj` ensuring all fields are zero-initialized, and fixes IPv6 address comparison logic (`ipv6_addr_equal`).\n2. Introduces hook generation sequence counters (`hook_base_seq` and `nat_hook_base_seq`) to detect concurrent modifications during netlink dumps (`nfnetlink_hook.c`, `core.c`, `nf_nat_core.c`), both initialized to 1 in `netfilter_net_init`.\n3. Adds `nf_ct_seqadj_reset` to explicitly zero `offset_before` and `offset_after` under lock in `nf_conntrack_seqadj.c`.\n4. Fixes flowtable cleanup to filter by network namespace and moves `write_pnet(\u0026ct_ft-\u003enf_ft.net, net)` before `nf_flow_table_init` in `act_ct.c`, ensuring `flowtable-\u003enet` is initialized before being added to the global flowtables list.\n5. Minor conntrack statistics adjustments, dead code elimination, and comment/typo fixes.\n\nNone of the changes introduce uninitialized variables, expose struct padding or uninitialized buffers to user space, or alter buffer bounds in a way that allows reads of uninitialized memory. Standard KASAN, LOCKDEP, and syzkaller fuzzing are sufficient to detect memory corruption, race conditions, or lifetime issues. KMSAN is not required.",
"NeedsKMSAN": false
} |
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