AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/08/02 00:14	flow	patch-triage	8m Args: null Results: { "EnableConfigs": [ "NF_TABLES", "NF_TABLES_IPV4", "NF_TABLES_IPV6", "NF_TABLES_INET", "NF_FLOW_TABLE", "NFT_FLOW_OFFLOAD", "NFT_REJECT_IPV4", "NFT_REJECT_IPV6", "NFT_REJECT_INET", "NFT_XFRM", "NFT_CONNLIMIT", "NF_CONNTRACK", "NET_IPIP", "IPV6_TUNNEL", "NET_DSA" ], "FocusSymbols": [ "nft_flow_route", "dev_fill_forward_path", "dev_fill_forward_path_release", "nf_send_reset", "nf_send_reset6", "nf_send_unreach", "nf_send_unreach6", "nft_meta_get_eval", "nft_rt_get_eval", "nf_conncount_add_skb", "nf_conncount_count_skb", "nf_conntrack_tcp_packet" ], "Reasoning": "The patch series modifies the core networking and netfilter subsystems to fix memory leaks and improve handling of `dst_entry` in `sk_buff` and `net_device_path`. It introduces `dev_fill_forward_path_release` to properly release `dst` entries, updates `skb_valid_dst` checks in netfilter reject, meta, rt, and xfrm modules, and modifies conntrack TCP state handling. These are functional changes in reachable core kernel paths and should be fuzzed.", "WorthFuzzing": true }
1/1	2026/08/02 00:14	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit b5a02d732b54e15ca3d563e801557347bb7e7ae5\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Sun Aug 2 00:14:39 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c\nindex 33ddf0d078553..a03af97505731 100644\n--- a/drivers/net/ethernet/airoha/airoha_ppe.c\n+++ b/drivers/net/ethernet/airoha/airoha_ppe.c\n@@ -296,14 +296,18 @@ static int airoha_ppe_get_wdma_info(struct net_device dev, const u8 addr,\n \t\treturn err;\n \n \tpath = \u0026stack.path[stack.num_paths - 1];\n-\tif (path-\u003etype != DEV_PATH_MTK_WDMA)\n-\t\treturn -EINVAL;\n+\tif (path-\u003etype != DEV_PATH_MTK_WDMA) {\n+\t\terr = -EINVAL;\n+\t\tgoto err_out;\n+\t}\n \n \tinfo-\u003eidx = path-\u003emtk_wdma.wdma_idx;\n \tinfo-\u003ebss = path-\u003emtk_wdma.bss;\n \tinfo-\u003ewcid = path-\u003emtk_wdma.wcid;\n+err_out:\n+\tdev_fill_forward_path_release(\u0026stack);\n \n-\treturn 0;\n+\treturn err;\n }\n \n static int airoha_get_dsa_port(struct net_device *dev)\ndiff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c\nindex cc8c4ef8038f3..771d9118f94ad 100644\n--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c\n+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c\n@@ -108,16 +108,20 @@ mtk_flow_get_wdma_info(struct net_device dev, const u8 addr, struct mtk_wdma_i\n \t\treturn err;\n \n \tpath = \u0026stack.path[stack.num_paths - 1];\n-\tif (path-\u003etype != DEV_PATH_MTK_WDMA)\n-\t\treturn -1;\n+\tif (path-\u003etype != DEV_PATH_MTK_WDMA) {\n+\t\terr = -EINVAL;\n+\t\tgoto err_out;\n+\t}\n \n \tinfo-\u003ewdma_idx = path-\u003emtk_wdma.wdma_idx;\n \tinfo-\u003equeue = path-\u003emtk_wdma.queue;\n \tinfo-\u003ebss = path-\u003emtk_wdma.bss;\n \tinfo-\u003ewcid = path-\u003emtk_wdma.wcid;\n \tinfo-\u003eamsdu = path-\u003emtk_wdma.amsdu;\n+err_out:\n+\tdev_fill_forward_path_release(\u0026stack);\n \n-\treturn 0;\n+\treturn err;\n }\n \n \ndiff --git a/include/linux/netdevice.h b/include/linux/netdevice.h\nindex 8db25b79573e3..62cfad7e6b79a 100644\n--- a/include/linux/netdevice.h\n+++ b/include/linux/netdevice.h\n@@ -892,6 +892,7 @@ struct net_device_path {\n \t\t\tu8\t\th_dest[ETH_ALEN];\n \t\t} encap;\n \t\tstruct {\n+\t\t\tstruct dst_entry dst;\n \t\t\tunion {\n \t\t\t\tstruct in_addr\tsrc_v4;\n \t\t\t\tstruct in6_addr\tsrc_v6;\n@@ -3427,6 +3428,7 @@ int dev_get_iflink(const struct net_device dev);\n int dev_fill_metadata_dst(struct net_device dev, struct sk_buff skb);\n int dev_fill_forward_path(const struct net_device dev, const u8 daddr,\n \t\t\t struct net_device_path_stack stack);\n+void dev_fill_forward_path_release(struct net_device_path_stack stack);\n struct net_device dev_get_by_name(struct net net, const char name);\n struct net_device dev_get_by_name_rcu(struct net net, const char name);\n struct net_device __dev_get_by_name(struct net net, const char name);\ndiff --git a/net/core/dev.c b/net/core/dev.c\nindex c1c1be1a6962f..e50ed677de725 100644\n--- a/net/core/dev.c\n+++ b/net/core/dev.c\n@@ -742,14 +742,33 @@ EXPORT_SYMBOL_GPL(dev_fill_metadata_dst);\n \n static struct net_device_path dev_fwd_path(struct net_device_path_stack stack)\n {\n-\tint k = stack-\u003enum_paths++;\n-\n-\tif (k \u003e= NET_DEVICE_PATH_STACK_MAX)\n+\tif (stack-\u003enum_paths + 1 \u003e NET_DEVICE_PATH_STACK_MAX)\n \t\treturn NULL;\n \n-\treturn \u0026stack-\u003epath[k];\n+\treturn \u0026stack-\u003epath[stack-\u003enum_paths];\n }\n \n+void dev_fill_forward_path_release(struct net_device_path_stack stack)\n+{\n+\tstruct net_device_path path;\n+\tint k;\n+\n+\tif (stack-\u003enum_paths == 0)\n+\t\treturn;\n+\n+\tfor (k = stack-\u003enum_paths - 1; k \u003e= 0; k--) {\n+\t\tpath = \u0026stack-\u003epath[k];\n+\t\tswitch (path-\u003etype) {\n+\t\tcase DEV_PATH_TUN:\n+\t\t\tdst_release(path-\u003etun.dst);\n+\t\t\tbreak;\n+\t\tdefault:\n+\t\t\tbreak;\n+\t\t}\n+\t}\n+}\n+EXPORT_SYMBOL_GPL(dev_fill_forward_path_release);\n+\n int dev_fill_forward_path(const struct net_device dev, const u8 daddr,\n \t\t\t struct net_device_path_stack stack)\n {\n@@ -766,15 +785,16 @@ int dev_fill_forward_path(const struct net_device dev, const u8 daddr,\n \t\tlast_dev = ctx.dev;\n \t\tpath = dev_fwd_path(stack);\n \t\tif (!path)\n-\t\t\treturn -1;\n+\t\t\tgoto err_out;\n \n \t\tmemset(path, 0, sizeof(struct net_device_path));\n \t\tret = ctx.dev-\u003enetdev_ops-\u003endo_fill_forward_path(\u0026ctx, path);\n \t\tif (ret \u003c 0)\n-\t\t\treturn -1;\n+\t\t\tgoto err_out;\n \n+\t\tstack-\u003enum_paths++;\n \t\tif (WARN_ON_ONCE(last_dev == ctx.dev))\n-\t\t\treturn -1;\n+\t\t\tgoto err_out;\n \t}\n \n \tif (!ctx.dev)\n@@ -782,11 +802,17 @@ int dev_fill_forward_path(const struct net_device dev, const u8 daddr,\n \n \tpath = dev_fwd_path(stack);\n \tif (!path)\n-\t\treturn -1;\n+\t\tgoto err_out;\n+\n \tpath-\u003etype = DEV_PATH_ETHERNET;\n \tpath-\u003edev = ctx.dev;\n+\tstack-\u003enum_paths++;\n \n-\treturn ret;\n+\treturn 0;\n+err_out:\n+\tdev_fill_forward_path_release(stack);\n+\n+\treturn -1;\n }\n EXPORT_SYMBOL_GPL(dev_fill_forward_path);\n \ndiff --git a/net/dsa/user.c b/net/dsa/user.c\nindex 03c7af6abe18a..4065c6ee6fc68 100644\n--- a/net/dsa/user.c\n+++ b/net/dsa/user.c\n@@ -2547,14 +2547,13 @@ static int dsa_user_fill_forward_path(struct net_device_path_ctx ctx,\n \t\t\t\t struct net_device_path path)\n {\n \tstruct dsa_port dp = dsa_user_to_port(ctx-\u003edev);\n-\tstruct net_device conduit = dsa_port_to_conduit(dp);\n \tstruct dsa_port cpu_dp = dp-\u003ecpu_dp;\n \n \tpath-\u003edev = ctx-\u003edev;\n \tpath-\u003etype = DEV_PATH_DSA;\n \tpath-\u003edsa.proto = cpu_dp-\u003etag_ops-\u003eproto;\n \tpath-\u003edsa.port = dp-\u003eindex;\n-\tctx-\u003edev = conduit;\n+\tctx-\u003edev = NULL;\n \n \treturn 0;\n }\ndiff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c\nindex 0831f6b81717c..fb7d96f99b06b 100644\n--- a/net/ipv4/ipip.c\n+++ b/net/ipv4/ipip.c\n@@ -376,10 +376,10 @@ static int ipip_fill_forward_path(struct net_device_path_ctx ctx,\n \tpath-\u003etun.src_v4.s_addr = tiph-\u003esaddr;\n \tpath-\u003etun.dst_v4.s_addr = tiph-\u003edaddr;\n \tpath-\u003etun.l3_proto = IPPROTO_IPIP;\n+\tpath-\u003etun.dst = \u0026rt-\u003edst;\n \tpath-\u003edev = ctx-\u003edev;\n \n \tctx-\u003edev = rt-\u003edst.dev;\n-\tip_rt_put(rt);\n \n \treturn 0;\n }\ndiff --git a/net/ipv4/netfilter/nf_reject_ipv4.c b/net/ipv4/netfilter/nf_reject_ipv4.c\nindex 4626dc46808f3..59ec465a9df98 100644\n--- a/net/ipv4/netfilter/nf_reject_ipv4.c\n+++ b/net/ipv4/netfilter/nf_reject_ipv4.c\n@@ -8,6 +8,7 @@\n #include \u003cnet/tcp.h\u003e\n #include \u003cnet/route.h\u003e\n #include \u003cnet/dst.h\u003e\n+#include \u003cnet/dst_metadata.h\u003e\n #include \u003cnet/netfilter/ipv4/nf_reject.h\u003e\n #include \u003clinux/netfilter_ipv4.h\u003e\n #include \u003clinux/netfilter_bridge.h\u003e\n@@ -263,6 +264,7 @@ static int nf_reject_fill_skb_dst(struct sk_buff skb_in)\n \tif (!dst)\n \t\treturn -1;\n \n+\tskb_dst_drop(skb_in);\n \tskb_dst_set(skb_in, dst);\n \treturn 0;\n }\n@@ -279,7 +281,7 @@ void nf_send_reset(struct net net, struct sock sk, struct sk_buff oldskb,\n \tif (!oth)\n \t\treturn;\n \n-\tif (!skb_dst(oldskb) \u0026\u0026 nf_reject_fill_skb_dst(oldskb) \u003c 0)\n+\tif (!skb_valid_dst(oldskb) \u0026\u0026 nf_reject_fill_skb_dst(oldskb) \u003c 0)\n \t\treturn;\n \n \tif (skb_rtable(oldskb)-\u003ert_flags \u0026 (RTCF_BROADCAST \| RTCF_MULTICAST))\n@@ -352,7 +354,7 @@ void nf_send_unreach(struct sk_buff skb_in, int code, int hook)\n \tif (iph-\u003efrag_off \u0026 htons(IP_OFFSET))\n \t\treturn;\n \n-\tif (!skb_dst(skb_in) \u0026\u0026 nf_reject_fill_skb_dst(skb_in) \u003c 0)\n+\tif (!skb_valid_dst(skb_in) \u0026\u0026 nf_reject_fill_skb_dst(skb_in) \u003c 0)\n \t\treturn;\n \n \tif (skb_csum_unnecessary(skb_in) \|\|\ndiff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c\nindex 97c3f61d627bb..d80020bc2620e 100644\n--- a/net/ipv6/ip6_tunnel.c\n+++ b/net/ipv6/ip6_tunnel.c\n@@ -1870,12 +1870,14 @@ static int ip6_tnl_fill_forward_path(struct net_device_path_ctx ctx,\n \t\tpath-\u003etun.src_v6 = fl6.saddr;\n \t\tpath-\u003etun.dst_v6 = fl6.daddr;\n \t\tpath-\u003etun.l3_proto = IPPROTO_IPV6;\n+\t\tpath-\u003etun.dst = dst;\n \t\tpath-\u003edev = ctx-\u003edev;\n \t\tctx-\u003edev = dst-\u003edev;\n \t}\n \n \terr = dst-\u003eerror;\n-\tdst_release(dst);\n+\tif (err)\n+\t\tdst_release(dst);\n \n \treturn err;\n }\ndiff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c\nindex ef5b7e85cffa8..07cdaa10da0d0 100644\n--- a/net/ipv6/netfilter/nf_reject_ipv6.c\n+++ b/net/ipv6/netfilter/nf_reject_ipv6.c\n@@ -8,6 +8,7 @@\n #include \u003cnet/ip6_route.h\u003e\n #include \u003cnet/ip6_fib.h\u003e\n #include \u003cnet/ip6_checksum.h\u003e\n+#include \u003cnet/dst_metadata.h\u003e\n #include \u003cnet/netfilter/ipv6/nf_reject.h\u003e\n #include \u003clinux/netfilter_ipv6.h\u003e\n #include \u003clinux/netfilter_bridge.h\u003e\n@@ -304,6 +305,7 @@ static int nf_reject6_fill_skb_dst(struct sk_buff skb_in)\n \tif (!dst)\n \t\treturn -1;\n \n+\tskb_dst_drop(skb_in);\n \tskb_dst_set(skb_in, dst);\n \treturn 0;\n }\n@@ -336,10 +338,12 @@ void nf_send_reset6(struct net net, struct sock sk, struct sk_buff oldskb,\n \tfl6.fl6_sport = otcph-\u003edest;\n \tfl6.fl6_dport = otcph-\u003esource;\n \n-\tif (!skb_dst(oldskb)) {\n+\tif (!skb_valid_dst(oldskb)) {\n \t\tnf_ip6_route(net, \u0026dst, flowi6_to_flowi(\u0026fl6), false);\n \t\tif (!dst)\n \t\t\treturn;\n+\n+\t\tskb_dst_drop(oldskb);\n \t\tskb_dst_set(oldskb, dst);\n \t}\n \n@@ -440,7 +444,7 @@ void nf_send_unreach6(struct net net, struct sk_buff skb_in,\n \tif (hooknum == NF_INET_LOCAL_OUT \u0026\u0026 skb_in-\u003edev == NULL)\n \t\tskb_in-\u003edev = net-\u003eloopback_dev;\n \n-\tif (!skb_dst(skb_in) \u0026\u0026 nf_reject6_fill_skb_dst(skb_in) \u003c 0)\n+\tif (!skb_valid_dst(skb_in) \u0026\u0026 nf_reject6_fill_skb_dst(skb_in) \u003c 0)\n \t\treturn;\n \n \ticmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0);\ndiff --git a/net/netfilter/nf_conncount.c b/net/netfilter/nf_conncount.c\nindex e9ea6d9466e74..85487f92af506 100644\n--- a/net/netfilter/nf_conncount.c\n+++ b/net/netfilter/nf_conncount.c\n@@ -158,6 +158,8 @@ static bool get_ct_or_tuple_from_skb(struct net net,\n \t\treturn true;\n \n \tfound_ct = nf_ct_tuplehash_to_ctrack(h);\n+\ttuple = found_ct-\u003etuplehash[IP_CT_DIR_ORIGINAL].tuple;\n+\tzone = nf_ct_zone(found_ct);\n \trefcounted = true;\n \tct = found_ct;\n \ndiff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c\nindex ceeed3d7fe520..723e946a78f40 100644\n--- a/net/netfilter/nf_conntrack_proto_tcp.c\n+++ b/net/netfilter/nf_conntrack_proto_tcp.c\n@@ -1281,8 +1281,9 @@ int nf_conntrack_tcp_packet(struct nf_conn ct,\n \tif (ct-\u003eproto.tcp.retrans \u003e= tn-\u003etcp_max_retrans \u0026\u0026\n \t timeouts[new_state] \u003e timeouts[TCP_CONNTRACK_RETRANS])\n \t\ttimeout = timeouts[TCP_CONNTRACK_RETRANS];\n-\telse if (unlikely(index == TCP_RST_SET))\n-\t\ttimeout = timeouts[TCP_CONNTRACK_CLOSE];\n+\telse if (unlikely(index == TCP_RST_SET \u0026\u0026\n+\t\t\t new_state == TCP_CONNTRACK_ESTABLISHED))\n+\t\ttimeout = timeouts[TCP_CONNTRACK_UNACK];\n \telse if ((ct-\u003eproto.tcp.seen[0].flags \| ct-\u003eproto.tcp.seen[1].flags) \u0026\n \t\t IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED \u0026\u0026\n \t\t timeouts[new_state] \u003e timeouts[TCP_CONNTRACK_UNACK])\ndiff --git a/net/netfilter/nf_flow_table_path.c b/net/netfilter/nf_flow_table_path.c\nindex 98c03b487f521..56219b02e1227 100644\n--- a/net/netfilter/nf_flow_table_path.c\n+++ b/net/netfilter/nf_flow_table_path.c\n@@ -42,8 +42,7 @@ static bool nft_is_valid_ether_device(const struct net_device dev)\n \treturn true;\n }\n \n-static int nft_dev_fill_forward_path(const struct nf_flow_route route,\n-\t\t\t\t const struct dst_entry dst_cache,\n+static int nft_dev_fill_forward_path(const struct dst_entry dst_cache,\n \t\t\t\t const struct nf_conn ct,\n \t\t\t\t enum ip_conntrack_dir dir, u8 ha,\n \t\t\t\t struct net_device_path_stack stack)\n@@ -76,14 +75,14 @@ static int nft_dev_fill_forward_path(const struct nf_flow_route route,\n }\n \n struct nft_forward_info {\n-\tconst struct net_device indev;\n-\tconst struct net_device outdev;\n+\tconst struct net_device dev;\n \tstruct id {\n \t\t__u16\tid;\n \t\t__be16\tproto;\n \t} encap[NF_FLOW_TABLE_ENCAP_MAX];\n \tu8 num_encaps;\n \tstruct flow_offload_tunnel tun;\n+\tstruct dst_entry tun_dst;\n \tu8 num_tuns;\n \tu8 ingress_vlans;\n \tu8 h_source[ETH_ALEN];\n@@ -92,9 +91,12 @@ struct nft_forward_info {\n \tenum flow_offload_xmit_type xmit_type;\n };\n \n-static int nft_dev_path_info(const struct net_device_path_stack stack,\n+static bool nft_flowtable_find_dev(const struct net_device dev,\n+\t\t\t\t struct nft_flowtable ft);\n+\n+static int nft_dev_path_info(struct net_device_path_stack stack,\n \t\t\t struct nft_forward_info info,\n-\t\t\t unsigned char ha, struct nf_flowtable flowtable)\n+\t\t\t unsigned char ha, struct nft_flowtable ft)\n {\n \tconst struct net_device_path path;\n \tint i;\n@@ -109,29 +111,27 @@ static int nft_dev_path_info(const struct net_device_path_stack stack,\n \t\tcase DEV_PATH_VLAN:\n \t\tcase DEV_PATH_PPPOE:\n \t\tcase DEV_PATH_TUN:\n-\t\t\tinfo-\u003eindev = path-\u003edev;\n+\t\t\tinfo-\u003edev = path-\u003edev;\n \t\t\tif (is_zero_ether_addr(info-\u003eh_source))\n \t\t\t\tmemcpy(info-\u003eh_source, path-\u003edev-\u003edev_addr, ETH_ALEN);\n \n-\t\t\tif (path-\u003etype == DEV_PATH_ETHERNET)\n+\t\t\tif (path-\u003etype == DEV_PATH_ETHERNET \|\|\n+\t\t\t path-\u003etype == DEV_PATH_DSA)\n \t\t\t\tbreak;\n-\t\t\tif (path-\u003etype == DEV_PATH_DSA) {\n-\t\t\t\ti = stack-\u003enum_paths;\n-\t\t\t\tbreak;\n-\t\t\t}\n \n \t\t\t/* DEV_PATH_VLAN, DEV_PATH_PPPOE and DEV_PATH_TUN /\n \t\t\tif (path-\u003etype == DEV_PATH_TUN) {\n \t\t\t\tif (info-\u003enum_tuns)\n-\t\t\t\t\treturn -1;\n+\t\t\t\t\tgoto err_out;\n \n \t\t\t\tinfo-\u003etun.src_v6 = path-\u003etun.src_v6;\n \t\t\t\tinfo-\u003etun.dst_v6 = path-\u003etun.dst_v6;\n \t\t\t\tinfo-\u003etun.l3_proto = path-\u003etun.l3_proto;\n+\t\t\t\tinfo-\u003etun_dst = path-\u003etun.dst;\n \t\t\t\tinfo-\u003enum_tuns++;\n \t\t\t} else {\n \t\t\t\tif (info-\u003enum_encaps \u003e= NF_FLOW_TABLE_ENCAP_MAX)\n-\t\t\t\t\treturn -1;\n+\t\t\t\t\tgoto err_out;\n \n \t\t\t\tinfo-\u003eencap[info-\u003enum_encaps].id =\n \t\t\t\t\tpath-\u003eencap.id;\n@@ -152,13 +152,13 @@ static int nft_dev_path_info(const struct net_device_path_stack stack,\n \t\t\tswitch (path-\u003ebridge.vlan_mode) {\n \t\t\tcase DEV_PATH_BR_VLAN_UNTAG_HW:\n \t\t\t\tif (info-\u003enum_encaps == 0)\n-\t\t\t\t\treturn -1;\n+\t\t\t\t\tgoto err_out;\n \n \t\t\t\tinfo-\u003eingress_vlans \|= BIT(info-\u003enum_encaps - 1);\n \t\t\t\tbreak;\n \t\t\tcase DEV_PATH_BR_VLAN_TAG:\n \t\t\t\tif (info-\u003enum_encaps \u003e= NF_FLOW_TABLE_ENCAP_MAX)\n-\t\t\t\t\treturn -1;\n+\t\t\t\t\tgoto err_out;\n \n \t\t\t\tinfo-\u003eencap[info-\u003enum_encaps].id = path-\u003ebridge.vlan_id;\n \t\t\t\tinfo-\u003eencap[info-\u003enum_encaps].proto = path-\u003ebridge.vlan_proto;\n@@ -166,7 +166,7 @@ static int nft_dev_path_info(const struct net_device_path_stack stack,\n \t\t\t\tbreak;\n \t\t\tcase DEV_PATH_BR_VLAN_UNTAG:\n \t\t\t\tif (info-\u003enum_encaps == 0)\n-\t\t\t\t\treturn -1;\n+\t\t\t\t\tgoto err_out;\n \n \t\t\t\tinfo-\u003enum_encaps--;\n \t\t\t\tbreak;\n@@ -176,16 +176,22 @@ static int nft_dev_path_info(const struct net_device_path_stack stack,\n \t\t\tinfo-\u003exmit_type = FLOW_OFFLOAD_XMIT_DIRECT;\n \t\t\tbreak;\n \t\tdefault:\n-\t\t\treturn -1;\n+\t\t\tgoto err_out;\n \t\t}\n \t}\n-\tinfo-\u003eoutdev = info-\u003eindev;\n \n-\tif (nf_flowtable_hw_offload(flowtable) \u0026\u0026\n-\t nft_is_valid_ether_device(info-\u003eindev))\n+\tif (nf_flowtable_hw_offload(\u0026ft-\u003edata) \u0026\u0026\n+\t nft_is_valid_ether_device(info-\u003edev))\n \t\tinfo-\u003exmit_type = FLOW_OFFLOAD_XMIT_DIRECT;\n \n+\tif (!nft_flowtable_find_dev(info-\u003edev, ft))\n+\t\tgoto err_out;\n+\n \treturn 0;\n+err_out:\n+\tdev_fill_forward_path_release(stack);\n+\n+\treturn -1;\n }\n \n static bool nft_flowtable_find_dev(const struct net_device dev,\n@@ -205,44 +211,6 @@ static bool nft_flowtable_find_dev(const struct net_device dev,\n \treturn found;\n }\n \n-static int nft_flow_tunnel_update_route(const struct nft_pktinfo pkt,\n-\t\t\t\t\tstruct flow_offload_tunnel tun,\n-\t\t\t\t\tstruct nf_flow_route route,\n-\t\t\t\t\tenum ip_conntrack_dir dir)\n-{\n-\tstruct dst_entry cur_dst = route-\u003etuple[dir].dst;\n-\tstruct dst_entry tun_dst = NULL;\n-\tstruct flowi fl = {};\n-\n-\tswitch (nft_pf(pkt)) {\n-\tcase NFPROTO_IPV4:\n-\t\tfl.u.ip4.daddr = tun-\u003edst_v4.s_addr;\n-\t\tfl.u.ip4.saddr = tun-\u003esrc_v4.s_addr;\n-\t\tfl.u.ip4.flowi4_iif = nft_in(pkt)-\u003eifindex;\n-\t\tfl.u.ip4.flowi4_dscp = ip4h_dscp(ip_hdr(pkt-\u003eskb));\n-\t\tfl.u.ip4.flowi4_mark = pkt-\u003eskb-\u003emark;\n-\t\tfl.u.ip4.flowi4_flags = FLOWI_FLAG_ANYSRC;\n-\t\tbreak;\n-\tcase NFPROTO_IPV6:\n-\t\tfl.u.ip6.daddr = tun-\u003edst_v6;\n-\t\tfl.u.ip6.saddr = tun-\u003esrc_v6;\n-\t\tfl.u.ip6.flowi6_iif = nft_in(pkt)-\u003eifindex;\n-\t\tfl.u.ip6.flowlabel = ip6_flowinfo(ipv6_hdr(pkt-\u003eskb));\n-\t\tfl.u.ip6.flowi6_mark = pkt-\u003eskb-\u003emark;\n-\t\tfl.u.ip6.flowi6_flags = FLOWI_FLAG_ANYSRC;\n-\t\tbreak;\n-\t}\n-\n-\tnf_route(nft_net(pkt), \u0026tun_dst, \u0026fl, false, nft_pf(pkt));\n-\tif (!tun_dst)\n-\t\treturn -ENOENT;\n-\n-\troute-\u003etuple[dir].dst = tun_dst;\n-\tdst_release(cur_dst);\n-\n-\treturn 0;\n-}\n-\n static int nft_dev_forward_path(const struct nft_pktinfo pkt,\n \t\t\t\tstruct nf_flow_route route,\n \t\t\t\tconst struct nf_conn ct,\n@@ -255,28 +223,25 @@ static int nft_dev_forward_path(const struct nft_pktinfo pkt,\n \tunsigned char ha[ETH_ALEN];\n \tint i;\n \n-\tif (nft_dev_fill_forward_path(route, dst, ct, dir, ha, \u0026stack) \u003c 0 \|\|\n-\t nft_dev_path_info(\u0026stack, \u0026info, ha, \u0026ft-\u003edata) \u003c 0)\n-\t\treturn -ENOENT;\n-\n-\tif (!nft_flowtable_find_dev(info.indev, ft))\n+\tif (nft_dev_fill_forward_path(dst, ct, dir, ha, \u0026stack) \u003c 0 \|\|\n+\t nft_dev_path_info(\u0026stack, \u0026info, ha, ft) \u003c 0)\n \t\treturn -ENOENT;\n \n-\tif (info.outdev)\n-\t\troute-\u003etuple[dir].out.ifindex = info.outdev-\u003eifindex;\n+\troute-\u003etuple[!dir].in.ifindex = info.dev-\u003eifindex;\n+\troute-\u003etuple[dir].out.ifindex = info.dev-\u003eifindex;\n \n-\troute-\u003etuple[!dir].in.ifindex = info.indev-\u003eifindex;\n \tfor (i = 0; i \u003c info.num_encaps; i++) {\n \t\troute-\u003etuple[!dir].in.encap[i].id = info.encap[i].id;\n \t\troute-\u003etuple[!dir].in.encap[i].proto = info.encap[i].proto;\n \t}\n \n-\tif (info.num_tuns \u0026\u0026\n-\t !nft_flow_tunnel_update_route(pkt, \u0026info.tun, route, dir)) {\n+\tif (info.num_tuns) {\n \t\troute-\u003etuple[!dir].in.tun.src_v6 = info.tun.dst_v6;\n \t\troute-\u003etuple[!dir].in.tun.dst_v6 = info.tun.src_v6;\n \t\troute-\u003etuple[!dir].in.tun.l3_proto = info.tun.l3_proto;\n \t\troute-\u003etuple[!dir].in.num_tuns = info.num_tuns;\n+\t\tdst_release(route-\u003etuple[dir].dst);\n+\t\troute-\u003etuple[dir].dst = info.tun_dst;\n \t}\n \n \troute-\u003etuple[!dir].in.num_encaps = info.num_encaps;\ndiff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c\nindex 0a43e0787a688..01cfbaa365250 100644\n--- a/net/netfilter/nft_meta.c\n+++ b/net/netfilter/nft_meta.c\n@@ -20,6 +20,7 @@\n #include \u003cnet/dst.h\u003e\n #include \u003cnet/ip.h\u003e\n #include \u003cnet/sock.h\u003e\n+#include \u003cnet/dst_metadata.h\u003e\n #include \u003cnet/tcp_states.h\u003e / for TCP_TIME_WAIT /\n #include \u003cnet/netfilter/nf_tables.h\u003e\n #include \u003cnet/netfilter/nf_tables_core.h\u003e\n@@ -279,11 +280,12 @@ static bool nft_meta_get_eval_ifname(enum nft_meta_keys key, u32 dest,\n static noinline bool\n nft_meta_get_eval_rtclassid(const struct sk_buff skb, u32 dest)\n {\n-\tconst struct dst_entry dst = skb_dst(skb);\n+\tconst struct dst_entry dst;\n \n-\tif (!dst)\n+\tif (!skb_valid_dst(skb))\n \t\treturn false;\n \n+\tdst = skb_dst(skb);\n \tdest = dst-\u003etclassid;\n \treturn true;\n }\ndiff --git a/net/netfilter/nft_rt.c b/net/netfilter/nft_rt.c\nindex aeb0094eafd80..841c863a08db5 100644\n--- a/net/netfilter/nft_rt.c\n+++ b/net/netfilter/nft_rt.c\n@@ -8,6 +8,7 @@\n #include \u003clinux/netfilter.h\u003e\n #include \u003clinux/netfilter/nf_tables.h\u003e\n #include \u003cnet/dst.h\u003e\n+#include \u003cnet/dst_metadata.h\u003e\n #include \u003cnet/ip6_route.h\u003e\n #include \u003cnet/route.h\u003e\n #include \u003cnet/netfilter/nf_tables.h\u003e\n@@ -59,10 +60,11 @@ void nft_rt_get_eval(const struct nft_expr expr,\n \tu32 dest = \u0026regs-\u003edata[priv-\u003edreg];\n \tconst struct dst_entry dst;\n \n-\tdst = skb_dst(skb);\n-\tif (!dst)\n+\tif (!skb_valid_dst(skb))\n \t\tgoto err;\n \n+\tdst = skb_dst(skb);\n+\n \tswitch (priv-\u003ekey) {\n #ifdef CONFIG_IP_ROUTE_CLASSID\n \tcase NFT_RT_CLASSID:\ndiff --git a/net/netfilter/nft_xfrm.c b/net/netfilter/nft_xfrm.c\nindex 8cec430643192..c8bba697f993a 100644\n--- a/net/netfilter/nft_xfrm.c\n+++ b/net/netfilter/nft_xfrm.c\n@@ -12,6 +12,7 @@\n #include \u003clinux/netfilter/nf_tables.h\u003e\n #include \u003cnet/netfilter/nf_tables_core.h\u003e\n #include \u003cnet/netfilter/nf_tables.h\u003e\n+#include \u003cnet/dst_metadata.h\u003e\n #include \u003clinux/in.h\u003e\n #include \u003cnet/xfrm.h\u003e\n \n@@ -177,9 +178,15 @@ static void nft_xfrm_get_eval_out(const struct nft_xfrm priv,\n \t\t\t\t struct nft_regs regs,\n \t\t\t\t const struct nft_pktinfo pkt)\n {\n-\tconst struct dst_entry dst = skb_dst(pkt-\u003eskb);\n+\tconst struct dst_entry dst;\n \tint i;\n \n+\tif (!skb_valid_dst(pkt-\u003eskb)) {\n+\t\tregs-\u003everdict.code = NFT_BREAK;\n+\t\treturn;\n+\t}\n+\n+\tdst = skb_dst(pkt-\u003eskb);\n \tfor (i = 0; dst \u0026\u0026 dst-\u003exfrm;\n \t dst = ((const struct xfrm_dst )dst)-\u003echild, i++) {\n \t\tif (i \u003c priv-\u003espnum)\n" }
2/1	2026/08/02 00:14	agent	patch-evaluator	8m Model: best-expensive Args: null Results: { "EnableConfigs": [ "NF_TABLES", "NF_TABLES_IPV4", "NF_TABLES_IPV6", "NF_TABLES_INET", "NF_FLOW_TABLE", "NFT_FLOW_OFFLOAD", "NFT_REJECT_IPV4", "NFT_REJECT_IPV6", "NFT_REJECT_INET", "NFT_XFRM", "NFT_CONNLIMIT", "NF_CONNTRACK", "NET_IPIP", "IPV6_TUNNEL", "NET_DSA" ], "FocusSymbols": [ "nft_flow_route", "dev_fill_forward_path", "dev_fill_forward_path_release", "nf_send_reset", "nf_send_reset6", "nf_send_unreach", "nf_send_unreach6", "nft_meta_get_eval", "nft_rt_get_eval", "nf_conncount_add_skb", "nf_conncount_count_skb", "nf_conntrack_tcp_packet" ], "Reasoning": "The patch series modifies the core networking and netfilter subsystems to fix memory leaks and improve handling of `dst_entry` in `sk_buff` and `net_device_path`. It introduces `dev_fill_forward_path_release` to properly release `dst` entries, updates `skb_valid_dst` checks in netfilter reject, meta, rt, and xfrm modules, and modifies conntrack TCP state handling. These are functional changes in reachable core kernel paths and should be fuzzed.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes: commit b5a02d732b54e15ca3d563e801557347bb7e7ae5 Author: syz-cluster <triage@syzkaller.com> Date: Sun Aug 2 00:14:39 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c index 33ddf0d078553..a03af97505731 100644 --- a/drivers/net/ethernet/airoha/airoha_ppe.c +++ b/drivers/net/ethernet/airoha/airoha_ppe.c @@ -296,14 +296,18 @@ static int airoha_ppe_get_wdma_info(struct net_device dev, const u8 addr, return err; path = &stack.path[stack.num_paths - 1]; - if (path->type != DEV_PATH_MTK_WDMA) - return -EINVAL; + if (path->type != DEV_PATH_MTK_WDMA) { + err = -EINVAL; + goto err_out; + } info->idx = path->mtk_wdma.wdma_idx; info->bss = path->mtk_wdma.bss; info->wcid = path->mtk_wdma.wcid; +err_out: + dev_fill_forward_path_release(&stack); - return 0; + return err; } static int airoha_get_dsa_port(struct net_device *dev) diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c index cc8c4ef8038f3..771d9118f94ad 100644 --- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c +++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c @@ -108,16 +108,20 @@ mtk_flow_get_wdma_info(struct net_device dev, const u8 addr, struct mtk_wdma_i return err; path = &stack.path[stack.num_paths - 1]; - if (path->type != DEV_PATH_MTK_WDMA) - return -1; + if (path->type != DEV_PATH_MTK_WDMA) { + err = -EINVAL; + goto err_out; + } info->wdma_idx = path->mtk_wdma.wdma_idx; info->queue = path->mtk_wdma.queue; info->bss = path->mtk_wdma.bss; info->wcid = path->mtk_wdma.wcid; info->amsdu = path->mtk_wdma.amsdu; +err_out: + dev_fill_forward_path_release(&stack); - return 0; + return err; } diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 8db25b79573e3..62cfad7e6b79a 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -892,6 +892,7 @@ struct net_device_path { u8 h_dest[ETH_ALEN]; } encap; struct { + struct dst_entry dst; union { struct in_addr src_v4; struct in6_addr src_v6; @@ -3427,6 +3428,7 @@ int dev_get_iflink(const struct net_device dev); int dev_fill_metadata_dst(struct net_device dev, struct sk_buff skb); int dev_fill_forward_path(const struct net_device dev, const u8 daddr, struct net_device_path_stack stack); +void dev_fill_forward_path_release(struct net_device_path_stack stack); struct net_device dev_get_by_name(struct net net, const char name); struct net_device dev_get_by_name_rcu(struct net net, const char name); struct net_device __dev_get_by_name(struct net net, const char name); diff --git a/net/core/dev.c b/net/core/dev.c index c1c1be1a6962f..e50ed677de725 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -742,14 +742,33 @@ EXPORT_SYMBOL_GPL(dev_fill_metadata_dst); static struct net_device_path dev_fwd_path(struct net_device_path_stack stack) { - int k = stack->num_paths++; - - if (k >= NET_DEVICE_PATH_STACK_MAX) + if (stack->num_paths + 1 > NET_DEVICE_PATH_STACK_MAX) return NULL; - return &stack->path[k]; + return &stack->path[stack->num_paths]; } +void dev_fill_forward_path_release(struct net_device_path_stack stack) +{ + struct net_device_path path; + int k; + + if (stack->num_paths == 0) + return; + + for (k = stack->num_paths - 1; k >= 0; k--) { + path = &stack->path[k]; + switch (path->type) { + case DEV_PATH_TUN: + dst_release(path->tun.dst); + break; + default: + break; + } + } +} +EXPORT_SYMBOL_GPL(dev_fill_forward_path_release); + int dev_fill_forward_path(const struct net_device dev, const u8 daddr, struct net_device_path_stack stack) { @@ -766,15 +785,16 @@ int dev_fill_forward_path(const struct net_device dev, const u8 daddr, last_dev = ctx.dev; path = dev_fwd_path(stack); if (!path) - return -1; + goto err_out; memset(path, 0, sizeof(struct net_device_path)); ret = ctx.dev->netdev_ops->ndo_fill_forward_path(&ctx, path); if (ret < 0) - return -1; + goto err_out; + stack->num_paths++; if (WARN_ON_ONCE(last_dev == ctx.dev)) - return -1; + goto err_out; } if (!ctx.dev) @@ -782,11 +802,17 @@ int dev_fill_forward_path(const struct net_device dev, const u8 daddr, path = dev_fwd_path(stack); if (!path) - return -1; + goto err_out; + path->type = DEV_PATH_ETHERNET; path->dev = ctx.dev; + stack->num_paths++; - return ret; + return 0; +err_out: + dev_fill_forward_path_release(stack); + + return -1; } EXPORT_SYMBOL_GPL(dev_fill_forward_path); diff --git a/net/dsa/user.c b/net/dsa/user.c index 03c7af6abe18a..4065c6ee6fc68 100644 --- a/net/dsa/user.c +++ b/net/dsa/user.c @@ -2547,14 +2547,13 @@ static int dsa_user_fill_forward_path(struct net_device_path_ctx ctx, struct net_device_path path) { struct dsa_port dp = dsa_user_to_port(ctx->dev); - struct net_device conduit = dsa_port_to_conduit(dp); struct dsa_port cpu_dp = dp->cpu_dp; path->dev = ctx->dev; path->type = DEV_PATH_DSA; path->dsa.proto = cpu_dp->tag_ops->proto; path->dsa.port = dp->index; - ctx->dev = conduit; + ctx->dev = NULL; return 0; } diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c index 0831f6b81717c..fb7d96f99b06b 100644 --- a/net/ipv4/ipip.c +++ b/net/ipv4/ipip.c @@ -376,10 +376,10 @@ static int ipip_fill_forward_path(struct net_device_path_ctx ctx, path->tun.src_v4.s_addr = tiph->saddr; path->tun.dst_v4.s_addr = tiph->daddr; path->tun.l3_proto = IPPROTO_IPIP; + path->tun.dst = &rt->dst; path->dev = ctx->dev; ctx->dev = rt->dst.dev; - ip_rt_put(rt); return 0; } diff --git a/net/ipv4/netfilter/nf_reject_ipv4.c b/net/ipv4/netfilter/nf_reject_ipv4.c index 4626dc46808f3..59ec465a9df98 100644 --- a/net/ipv4/netfilter/nf_reject_ipv4.c +++ b/net/ipv4/netfilter/nf_reject_ipv4.c @@ -8,6 +8,7 @@ #include <net/tcp.h> #include <net/route.h> #include <net/dst.h> +#include <net/dst_metadata.h> #include <net/netfilter/ipv4/nf_reject.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter_bridge.h> @@ -263,6 +264,7 @@ static int nf_reject_fill_skb_dst(struct sk_buff skb_in) if (!dst) return -1; + skb_dst_drop(skb_in); skb_dst_set(skb_in, dst); return 0; } @@ -279,7 +281,7 @@ void nf_send_reset(struct net net, struct sock sk, struct sk_buff oldskb, if (!oth) return; - if (!skb_dst(oldskb) && nf_reject_fill_skb_dst(oldskb) < 0) + if (!skb_valid_dst(oldskb) && nf_reject_fill_skb_dst(oldskb) < 0) return; if (skb_rtable(oldskb)->rt_flags & (RTCF_BROADCAST \| RTCF_MULTICAST)) @@ -352,7 +354,7 @@ void nf_send_unreach(struct sk_buff skb_in, int code, int hook) if (iph->frag_off & htons(IP_OFFSET)) return; - if (!skb_dst(skb_in) && nf_reject_fill_skb_dst(skb_in) < 0) + if (!skb_valid_dst(skb_in) && nf_reject_fill_skb_dst(skb_in) < 0) return; if (skb_csum_unnecessary(skb_in) \|\| diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 97c3f61d627bb..d80020bc2620e 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -1870,12 +1870,14 @@ static int ip6_tnl_fill_forward_path(struct net_device_path_ctx ctx, path->tun.src_v6 = fl6.saddr; path->tun.dst_v6 = fl6.daddr; path->tun.l3_proto = IPPROTO_IPV6; + path->tun.dst = dst; path->dev = ctx->dev; ctx->dev = dst->dev; } err = dst->error; - dst_release(dst); + if (err) + dst_release(dst); return err; } diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c index ef5b7e85cffa8..07cdaa10da0d0 100644 --- a/net/ipv6/netfilter/nf_reject_ipv6.c +++ b/net/ipv6/netfilter/nf_reject_ipv6.c @@ -8,6 +8,7 @@ #include <net/ip6_route.h> #include <net/ip6_fib.h> #include <net/ip6_checksum.h> +#include <net/dst_metadata.h> #include <net/netfilter/ipv6/nf_reject.h> #include <linux/netfilter_ipv6.h> #include <linux/netfilter_bridge.h> @@ -304,6 +305,7 @@ static int nf_reject6_fill_skb_dst(struct sk_buff skb_in) if (!dst) return -1; + skb_dst_drop(skb_in); skb_dst_set(skb_in, dst); return 0; } @@ -336,10 +338,12 @@ void nf_send_reset6(struct net net, struct sock sk, struct sk_buff oldskb, fl6.fl6_sport = otcph->dest; fl6.fl6_dport = otcph->source; - if (!skb_dst(oldskb)) { + if (!skb_valid_dst(oldskb)) { nf_ip6_route(net, &dst, flowi6_to_flowi(&fl6), false); if (!dst) return; + + skb_dst_drop(oldskb); skb_dst_set(oldskb, dst); } @@ -440,7 +444,7 @@ void nf_send_unreach6(struct net net, struct sk_buff skb_in, if (hooknum == NF_INET_LOCAL_OUT && skb_in->dev == NULL) skb_in->dev = net->loopback_dev; - if (!skb_dst(skb_in) && nf_reject6_fill_skb_dst(skb_in) < 0) + if (!skb_valid_dst(skb_in) && nf_reject6_fill_skb_dst(skb_in) < 0) return; icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0); diff --git a/net/netfilter/nf_conncount.c b/net/netfilter/nf_conncount.c index e9ea6d9466e74..85487f92af506 100644 --- a/net/netfilter/nf_conncount.c +++ b/net/netfilter/nf_conncount.c @@ -158,6 +158,8 @@ static bool get_ct_or_tuple_from_skb(struct net net, return true; found_ct = nf_ct_tuplehash_to_ctrack(h); + tuple = found_ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; + zone = nf_ct_zone(found_ct); refcounted = true; ct = found_ct; diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index ceeed3d7fe520..723e946a78f40 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -1281,8 +1281,9 @@ int nf_conntrack_tcp_packet(struct nf_conn ct, if (ct->proto.tcp.retrans >= tn->tcp_max_retrans && timeouts[new_state] > timeouts[TCP_CONNTRACK_RETRANS]) timeout = timeouts[TCP_CONNTRACK_RETRANS]; - else if (unlikely(index == TCP_RST_SET)) - timeout = timeouts[TCP_CONNTRACK_CLOSE]; + else if (unlikely(index == TCP_RST_SET && + new_state == TCP_CONNTRACK_ESTABLISHED)) + timeout = timeouts[TCP_CONNTRACK_UNACK]; else if ((ct->proto.tcp.seen[0].flags \| ct->proto.tcp.seen[1].flags) & IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED && timeouts[new_state] > timeouts[TCP_CONNTRACK_UNACK]) diff --git a/net/netfilter/nf_flow_table_path.c b/net/netfilter/nf_flow_table_path.c index 98c03b487f521..56219b02e1227 100644 --- a/net/netfilter/nf_flow_table_path.c +++ b/net/netfilter/nf_flow_table_path.c @@ -42,8 +42,7 @@ static bool nft_is_valid_ether_device(const struct net_device dev) return true; } -static int nft_dev_fill_forward_path(const struct nf_flow_route route, - const struct dst_entry dst_cache, +static int nft_dev_fill_forward_path(const struct dst_entry dst_cache, const struct nf_conn ct, enum ip_conntrack_dir dir, u8 ha, struct net_device_path_stack stack) @@ -76,14 +75,14 @@ static int nft_dev_fill_forward_path(const struct nf_flow_route route, } struct nft_forward_info { - const struct net_device indev; - const struct net_device outdev; + const struct net_device dev; struct id { __u16 id; __be16 proto; } encap[NF_FLOW_TABLE_ENCAP_MAX]; u8 num_encaps; struct flow_offload_tunnel tun; + struct dst_entry tun_dst; u8 num_tuns; u8 ingress_vlans; u8 h_source[ETH_ALEN]; @@ -92,9 +91,12 @@ struct nft_forward_info { enum flow_offload_xmit_type xmit_type; }; -static int nft_dev_path_info(const struct net_device_path_stack stack, +static bool nft_flowtable_find_dev(const struct net_device dev, + struct nft_flowtable ft); + +static int nft_dev_path_info(struct net_device_path_stack stack, struct nft_forward_info info, - unsigned char ha, struct nf_flowtable flowtable) + unsigned char ha, struct nft_flowtable ft) { const struct net_device_path path; int i; @@ -109,29 +111,27 @@ static int nft_dev_path_info(const struct net_device_path_stack stack, case DEV_PATH_VLAN: case DEV_PATH_PPPOE: case DEV_PATH_TUN: - info->indev = path->dev; + info->dev = path->dev; if (is_zero_ether_addr(info->h_source)) memcpy(info->h_source, path->dev->dev_addr, ETH_ALEN); - if (path->type == DEV_PATH_ETHERNET) + if (path->type == DEV_PATH_ETHERNET \|\| + path->type == DEV_PATH_DSA) break; - if (path->type == DEV_PATH_DSA) { - i = stack->num_paths; - break; - } /* DEV_PATH_VLAN, DEV_PATH_PPPOE and DEV_PATH_TUN / if (path->type == DEV_PATH_TUN) { if (info->num_tuns) - return -1; + goto err_out; info->tun.src_v6 = path->tun.src_v6; info->tun.dst_v6 = path->tun.dst_v6; info->tun.l3_proto = path->tun.l3_proto; + info->tun_dst = path->tun.dst; info->num_tuns++; } else { if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) - return -1; + goto err_out; info->encap[info->num_encaps].id = path->encap.id; @@ -152,13 +152,13 @@ static int nft_dev_path_info(const struct net_device_path_stack stack, switch (path->bridge.vlan_mode) { case DEV_PATH_BR_VLAN_UNTAG_HW: if (info->num_encaps == 0) - return -1; + goto err_out; info->ingress_vlans \|= BIT(info->num_encaps - 1); break; case DEV_PATH_BR_VLAN_TAG: if (info->num_encaps >= NF_FLOW_TABLE_ENCAP_MAX) - return -1; + goto err_out; info->encap[info->num_encaps].id = path->bridge.vlan_id; info->encap[info->num_encaps].proto = path->bridge.vlan_proto; @@ -166,7 +166,7 @@ static int nft_dev_path_info(const struct net_device_path_stack stack, break; case DEV_PATH_BR_VLAN_UNTAG: if (info->num_encaps == 0) - return -1; + goto err_out; info->num_encaps--; break; @@ -176,16 +176,22 @@ static int nft_dev_path_info(const struct net_device_path_stack stack, info->xmit_type = FLOW_OFFLOAD_XMIT_DIRECT; break; default: - return -1; + goto err_out; } } - info->outdev = info->indev; - if (nf_flowtable_hw_offload(flowtable) && - nft_is_valid_ether_device(info->indev)) + if (nf_flowtable_hw_offload(&ft->data) && + nft_is_valid_ether_device(info->dev)) info->xmit_type = FLOW_OFFLOAD_XMIT_DIRECT; + if (!nft_flowtable_find_dev(info->dev, ft)) + goto err_out; + return 0; +err_out: + dev_fill_forward_path_release(stack); + + return -1; } static bool nft_flowtable_find_dev(const struct net_device dev, @@ -205,44 +211,6 @@ static bool nft_flowtable_find_dev(const struct net_device dev, return found; } -static int nft_flow_tunnel_update_route(const struct nft_pktinfo pkt, - struct flow_offload_tunnel tun, - struct nf_flow_route route, - enum ip_conntrack_dir dir) -{ - struct dst_entry cur_dst = route->tuple[dir].dst; - struct dst_entry tun_dst = NULL; - struct flowi fl = {}; - - switch (nft_pf(pkt)) { - case NFPROTO_IPV4: - fl.u.ip4.daddr = tun->dst_v4.s_addr; - fl.u.ip4.saddr = tun->src_v4.s_addr; - fl.u.ip4.flowi4_iif = nft_in(pkt)->ifindex; - fl.u.ip4.flowi4_dscp = ip4h_dscp(ip_hdr(pkt->skb)); - fl.u.ip4.flowi4_mark = pkt->skb->mark; - fl.u.ip4.flowi4_flags = FLOWI_FLAG_ANYSRC; - break; - case NFPROTO_IPV6: - fl.u.ip6.daddr = tun->dst_v6; - fl.u.ip6.saddr = tun->src_v6; - fl.u.ip6.flowi6_iif = nft_in(pkt)->ifindex; - fl.u.ip6.flowlabel = ip6_flowinfo(ipv6_hdr(pkt->skb)); - fl.u.ip6.flowi6_mark = pkt->skb->mark; - fl.u.ip6.flowi6_flags = FLOWI_FLAG_ANYSRC; - break; - } - - nf_route(nft_net(pkt), &tun_dst, &fl, false, nft_pf(pkt)); - if (!tun_dst) - return -ENOENT; - - route->tuple[dir].dst = tun_dst; - dst_release(cur_dst); - - return 0; -} - static int nft_dev_forward_path(const struct nft_pktinfo pkt, struct nf_flow_route route, const struct nf_conn ct, @@ -255,28 +223,25 @@ static int nft_dev_forward_path(const struct nft_pktinfo pkt, unsigned char ha[ETH_ALEN]; int i; - if (nft_dev_fill_forward_path(route, dst, ct, dir, ha, &stack) < 0 \|\| - nft_dev_path_info(&stack, &info, ha, &ft->data) < 0) - return -ENOENT; - - if (!nft_flowtable_find_dev(info.indev, ft)) + if (nft_dev_fill_forward_path(dst, ct, dir, ha, &stack) < 0 \|\| + nft_dev_path_info(&stack, &info, ha, ft) < 0) return -ENOENT; - if (info.outdev) - route->tuple[dir].out.ifindex = info.outdev->ifindex; + route->tuple[!dir].in.ifindex = info.dev->ifindex; + route->tuple[dir].out.ifindex = info.dev->ifindex; - route->tuple[!dir].in.ifindex = info.indev->ifindex; for (i = 0; i < info.num_encaps; i++) { route->tuple[!dir].in.encap[i].id = info.encap[i].id; route->tuple[!dir].in.encap[i].proto = info.encap[i].proto; } - if (info.num_tuns && - !nft_flow_tunnel_update_route(pkt, &info.tun, route, dir)) { + if (info.num_tuns) { route->tuple[!dir].in.tun.src_v6 = info.tun.dst_v6; route->tuple[!dir].in.tun.dst_v6 = info.tun.src_v6; route->tuple[!dir].in.tun.l3_proto = info.tun.l3_proto; route->tuple[!dir].in.num_tuns = info.num_tuns; + dst_release(route->tuple[dir].dst); + route->tuple[dir].dst = info.tun_dst; } route->tuple[!dir].in.num_encaps = info.num_encaps; diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c index 0a43e0787a688..01cfbaa365250 100644 --- a/net/netfilter/nft_meta.c +++ b/net/netfilter/nft_meta.c @@ -20,6 +20,7 @@ #include <net/dst.h> #include <net/ip.h> #include <net/sock.h> +#include <net/dst_metadata.h> #include <net/tcp_states.h> / for TCP_TIME_WAIT / #include <net/netfilter/nf_tables.h> #include <net/netfilter/nf_tables_core.h> @@ -279,11 +280,12 @@ static bool nft_meta_get_eval_ifname(enum nft_meta_keys key, u32 dest, static noinline bool nft_meta_get_eval_rtclassid(const struct sk_buff skb, u32 dest) { - const struct dst_entry dst = skb_dst(skb); + const struct dst_entry dst; - if (!dst) + if (!skb_valid_dst(skb)) return false; + dst = skb_dst(skb); dest = dst->tclassid; return true; } diff --git a/net/netfilter/nft_rt.c b/net/netfilter/nft_rt.c index aeb0094eafd80..841c863a08db5 100644 --- a/net/netfilter/nft_rt.c +++ b/net/netfilter/nft_rt.c @@ -8,6 +8,7 @@ #include <linux/netfilter.h> #include <linux/netfilter/nf_tables.h> #include <net/dst.h> +#include <net/dst_metadata.h> #include <net/ip6_route.h> #include <net/route.h> #include <net/netfilter/nf_tables.h> @@ -59,10 +60,11 @@ void nft_rt_get_eval(const struct nft_expr expr, u32 dest = &regs->data[priv->dreg]; const struct dst_entry dst; - dst = skb_dst(skb); - if (!dst) + if (!skb_valid_dst(skb)) goto err; + dst = skb_dst(skb); + switch (priv->key) { #ifdef CONFIG_IP_ROUTE_CLASSID case NFT_RT_CLASSID: diff --git a/net/netfilter/nft_xfrm.c b/net/netfilter/nft_xfrm.c index 8cec430643192..c8bba697f993a 100644 --- a/net/netfilter/nft_xfrm.c +++ b/net/netfilter/nft_xfrm.c @@ -12,6 +12,7 @@ #include <linux/netfilter/nf_tables.h> #include <net/netfilter/nf_tables_core.h> #include <net/netfilter/nf_tables.h> +#include <net/dst_metadata.h> #include <linux/in.h> #include <net/xfrm.h> @@ -177,9 +178,15 @@ static void nft_xfrm_get_eval_out(const struct nft_xfrm priv, struct nft_regs regs, const struct nft_pktinfo pkt) { - const struct dst_entry dst = skb_dst(pkt->skb); + const struct dst_entry dst; int i; + if (!skb_valid_dst(pkt->skb)) { + regs->verdict.code = NFT_BREAK; + return; + } + + dst = skb_dst(pkt->skb); for (i = 0; dst && dst->xfrm; dst = ((const struct xfrm_dst )dst)->child, i++) { if (i < priv->spnum)
3/2	2026/08/02 00:14	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10685 output: 21 thoughts: 1182 Thoughts: Analyzing Networking Subsystem Changes Okay, so I'm looking at this patch series and it's touching a whole bunch of files related to networking – specifically around `net_device_path_stack`, the forward path filling, conntrack, flow table interactions, and skb destination validity checks. My initial assessment is that these are mostly functional changes aimed at addressing memory leaks related to the `dst_release` and tweaking the conntrack and flowtable behaviors. That's good, important stuff. First, I see some consistent changes: * Added `dev_fill_forward_path_release` calls in error paths in several drivers, like airoha and mediatek. * The `net_device_path` struct in `netdevice.h` has a new `dst` field within the `tun` union, and the new `dev_fill_forward_path_release` function is declared. * I see a new implementation for `dev_fill_forward_path_release` in `dev.c`, which specifically releases the `dst` entry for the tunneling case and modifications to the main `dev_fill_forward_path` function to call the release function in case of error. It looks like we are correctly releasing `dst` on error, which should reduce potential memory leaks. Also, it looks like `dsa_user_fill_forward_path` has been updated to set the context `dev` member to NULL, and the tunneling paths in IPv4 and IPv6 are now storing the destination in `path->tun.dst`, rather than immediately releasing it, which should improve performance. Replacing `!skb_dst(skb)` with `!skb_valid_dst(skb)` is good. Also, in the reject code, setting `skb_dst_drop(skb)` prior to `skb_dst_set(skb, dst)` is also important. This improves robustness. The Conntrack changes seem interesting. I see a change to `nf_conntrack_tcp_packet`, which could have implications on performance. There is a change to how conntrack tuples are accessed, and a timeout change as well. Now, the flow table stuff looks to have been modified to support the changes. The route argument was removed. It looks like the main entry points are the `nft_dev_forward_path` and `nft_dev_path_info`, and now the tun destination `info.tun_dst` is used. Given the scope of these changes, I'm going to want to focus my fuzzing efforts on these core functions. I will need to really focus on the changes relating to error handling, new function calls, and the addition of conntrack. * `dev_fill_forward_path` and `dev_fill_forward_path_release`, which are clearly central. * `nft_dev_forward_path` and `nft_dev_path_info`, because of their role in the flow table path. * The rejection function calls such as `nf_reject_fill_skb_dst` and `nf_send_reset`, `nf_send_unreach`. * `nf_conntrack_tcp_packet`, and `get_ct_or_tuple_from_skb`, because this is the conntrack function. I want to see what is calling `nft_dev_forward_path`. I'll use grep for that! I need to ensure that the correct tunnel routes are being chosen. Let me check the call sites for that.
4/2	2026/08/02 00:14	tool	grepper	0m Args: { "Expression": "nft_dev_forward_path" } Results: { "Output": "net/netfilter/nf_flow_table_path.c=197=static bool nft_flowtable_find_dev(const struct net_device dev,\n--\nnet/netfilter/nf_flow_table_path.c-213-\nnet/netfilter/nf_flow_table_path.c:214:static int nft_dev_forward_path(const struct nft_pktinfo pkt,\nnet/netfilter/nf_flow_table_path.c-215-\t\t\t\tstruct nf_flow_route route,\n--\nnet/netfilter/nf_flow_table_path.c=260=int nft_flow_route(const struct nft_pktinfo pkt, const struct nf_conn *ct,\n--\nnet/netfilter/nf_flow_table_path.c-302-\tif (route-\u003etuple[dir].xmit_type\t== FLOW_OFFLOAD_XMIT_NEIGH \u0026\u0026\nnet/netfilter/nf_flow_table_path.c:303:\t nft_dev_forward_path(pkt, route, ct, dir, ft) \u003c 0)\nnet/netfilter/nf_flow_table_path.c-304-\t\tgoto err_dst_release;\n--\nnet/netfilter/nf_flow_table_path.c-306-\tif (route-\u003etuple[!dir].xmit_type == FLOW_OFFLOAD_XMIT_NEIGH \u0026\u0026\nnet/netfilter/nf_flow_table_path.c:307:\t nft_dev_forward_path(pkt, route, ct, !dir, ft) \u003c 0)\nnet/netfilter/nf_flow_table_path.c-308-\t\tgoto err_dst_release;\n" }
5/2	2026/08/02 00:14	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13086 output: 19 thoughts: 28 Thoughts: Here's my thought process, summarized as you requested: Navigating the NFT Flow Route Okay, so the `nft_flow_route` function. That's our starting point. I need to understand how this system actually works, and that means tracing the execution path. Therefore, my immediate next step is to locate every single instance where `nft_flow_route` is called. Finding those call sites will give me the crucial context I need to grasp the logic flow. Let's dig in and see where it's being used. This is going to be key to unpacking the behavior!
6/2	2026/08/02 00:14	tool	grepper	0m Args: { "Expression": "nft_flow_route" } Results: { "Output": "include/net/netfilter/nf_flow_table.h=247=struct nft_pktinfo;\ninclude/net/netfilter/nf_flow_table.h:248:int nft_flow_route(const struct nft_pktinfo pkt, const struct nf_conn ct,\ninclude/net/netfilter/nf_flow_table.h-249-\t\t struct nf_flow_route route, enum ip_conntrack_dir dir,\n--\nnet/netfilter/nf_flow_table_path.c=214=static int nft_dev_forward_path(const struct nft_pktinfo pkt,\n--\nnet/netfilter/nf_flow_table_path.c-259-\nnet/netfilter/nf_flow_table_path.c:260:int nft_flow_route(const struct nft_pktinfo pkt, const struct nf_conn ct,\nnet/netfilter/nf_flow_table_path.c-261-\t\t struct nf_flow_route route, enum ip_conntrack_dir dir,\n--\nnet/netfilter/nf_flow_table_path.c-316-}\nnet/netfilter/nf_flow_table_path.c:317:EXPORT_SYMBOL_GPL(nft_flow_route);\n--\nnet/netfilter/nft_flow_offload.c=50=static void nft_flow_offload_eval(const struct nft_expr expr,\n--\nnet/netfilter/nft_flow_offload.c-108-\tdir = CTINFO2DIR(ctinfo);\nnet/netfilter/nft_flow_offload.c:109:\tif (nft_flow_route(pkt, ct, \u0026route, dir, priv-\u003eflowtable) \u003c 0)\nnet/netfilter/nft_flow_offload.c-110-\t\tgoto err_flow_route;\n" }
7/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13732 output: 19 thoughts: 96 Thoughts: Okay, let me think this through. Analyzing Key Functions in the Netfilter Flow and Connection Tracking Path Alright, so I'm focusing on how we're handling flow table changes, and `nft_flow_offload_eval` is clearly the critical starting point here, the main entry into the new flow table path. But I can't just stop there. I need to understand the full picture, to consider potential ripple effects. My mind is jumping around functions, searching for dependencies and potential conflicts. Now, `nf_conntrack_tcp_packet`... that's a core function within conntrack, right? Any change here could be... significant. It's a foundational element. I need to understand how these paths interact. And then there's `nf_reject_fill_skb_dst`. That’s called from `nf_send_reset` and `nf_send_unreach`. These functions handle ICMP responses to dropped packets. Is there a dependency there? This likely has to be checked, as this could have the potential for a lot of complexity. The path forward has to be clear. So, I'm already asking myself how the interactions between the functions work. I need to keep tracing these relationships, thinking about how changes in one place might influence others, how they fit into the bigger picture. `nf_send_reset` itself... what's its role? This is where I am right now, digging in further.
8/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "nf_send_reset" } Results: { "Output": "include/net/netfilter/ipv4/nf_reject.h=10=void nf_send_unreach(struct sk_buff skb_in, int code, int hook);\ninclude/net/netfilter/ipv4/nf_reject.h:11:void nf_send_reset(struct net net, struct sock , struct sk_buff oldskb,\ninclude/net/netfilter/ipv4/nf_reject.h-12-\t\t int hook);\n--\ninclude/net/netfilter/ipv6/nf_reject.h=8=void nf_send_unreach6(struct net net, struct sk_buff skb_in, unsigned char code,\ninclude/net/netfilter/ipv6/nf_reject.h-9-\t\t unsigned int hooknum);\ninclude/net/netfilter/ipv6/nf_reject.h:10:void nf_send_reset6(struct net net, struct sock sk, struct sk_buff oldskb,\ninclude/net/netfilter/ipv6/nf_reject.h-11-\t\t int hook);\n--\nnet/ipv4/netfilter/ipt_REJECT.c=31=reject_tg(struct sk_buff skb, const struct xt_action_param par)\n--\nnet/ipv4/netfilter/ipt_REJECT.c-58-\tcase IPT_TCP_RESET:\nnet/ipv4/netfilter/ipt_REJECT.c:59:\t\tnf_send_reset(xt_net(par), par-\u003estate-\u003esk, skb, hook);\nnet/ipv4/netfilter/ipt_REJECT.c-60-\t\tbreak;\n--\nnet/ipv4/netfilter/nf_reject_ipv4.c=256=static int nf_reject_fill_skb_dst(struct sk_buff skb_in)\n--\nnet/ipv4/netfilter/nf_reject_ipv4.c-272-/* Send RST reply /\nnet/ipv4/netfilter/nf_reject_ipv4.c:273:void nf_send_reset(struct net net, struct sock sk, struct sk_buff oldskb,\nnet/ipv4/netfilter/nf_reject_ipv4.c-274-\t\t int hook)\n--\nnet/ipv4/netfilter/nf_reject_ipv4.c-345-}\nnet/ipv4/netfilter/nf_reject_ipv4.c:346:EXPORT_SYMBOL_GPL(nf_send_reset);\nnet/ipv4/netfilter/nf_reject_ipv4.c-347-\n--\nnet/ipv4/netfilter/nft_reject_ipv4.c=19=static void nft_reject_ipv4_eval(const struct nft_expr expr,\n--\nnet/ipv4/netfilter/nft_reject_ipv4.c-29-\tcase NFT_REJECT_TCP_RST:\nnet/ipv4/netfilter/nft_reject_ipv4.c:30:\t\tnf_send_reset(nft_net(pkt), nft_sk(pkt), pkt-\u003eskb,\nnet/ipv4/netfilter/nft_reject_ipv4.c-31-\t\t\t nft_hook(pkt));\n--\nnet/ipv6/netfilter/ip6t_REJECT.c=35=reject_tg6(struct sk_buff skb, const struct xt_action_param par)\n--\nnet/ipv6/netfilter/ip6t_REJECT.c-63-\tcase IP6T_TCP_RESET:\nnet/ipv6/netfilter/ip6t_REJECT.c:64:\t\tnf_send_reset6(net, par-\u003estate-\u003esk, skb, xt_hooknum(par));\nnet/ipv6/netfilter/ip6t_REJECT.c-65-\t\tbreak;\n--\nnet/ipv6/netfilter/nf_reject_ipv6.c=297=static int nf_reject6_fill_skb_dst(struct sk_buff skb_in)\n--\nnet/ipv6/netfilter/nf_reject_ipv6.c-312-\nnet/ipv6/netfilter/nf_reject_ipv6.c:313:void nf_send_reset6(struct net net, struct sock sk, struct sk_buff oldskb,\nnet/ipv6/netfilter/nf_reject_ipv6.c-314-\t\t int hook)\n--\nnet/ipv6/netfilter/nf_reject_ipv6.c-413-}\nnet/ipv6/netfilter/nf_reject_ipv6.c:414:EXPORT_SYMBOL_GPL(nf_send_reset6);\nnet/ipv6/netfilter/nf_reject_ipv6.c-415-\n--\nnet/ipv6/netfilter/nft_reject_ipv6.c=19=static void nft_reject_ipv6_eval(const struct nft_expr expr,\n--\nnet/ipv6/netfilter/nft_reject_ipv6.c-30-\tcase NFT_REJECT_TCP_RST:\nnet/ipv6/netfilter/nft_reject_ipv6.c:31:\t\tnf_send_reset6(nft_net(pkt), nft_sk(pkt), pkt-\u003eskb,\nnet/ipv6/netfilter/nft_reject_ipv6.c-32-\t\t\t nft_hook(pkt));\n--\nnet/netfilter/nft_reject_inet.c=17=static void nft_reject_inet_eval(const struct nft_expr *expr,\n--\nnet/netfilter/nft_reject_inet.c-30-\t\tcase NFT_REJECT_TCP_RST:\nnet/netfilter/nft_reject_inet.c:31:\t\t\tnf_send_reset(nft_net(pkt), nft_sk(pkt),\nnet/netfilter/nft_reject_inet.c-32-\t\t\t\t pkt-\u003eskb, nft_hook(pkt));\n--\nnet/netfilter/nft_reject_inet.c-47-\t\tcase NFT_REJECT_TCP_RST:\nnet/netfilter/nft_reject_inet.c:48:\t\t\tnf_send_reset6(nft_net(pkt), nft_sk(pkt),\nnet/netfilter/nft_reject_inet.c-49-\t\t\t\t pkt-\u003eskb, nft_hook(pkt));\n" }
9/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15718 output: 21 thoughts: 171 Thoughts: My Initial Thoughts on Netfilter Expression Evaluation Okay, so I'm looking at these Netfilter entry points and want to understand their roles. I see `nft_reject_ipv4_eval`, `nft_reject_ipv6_eval`, `nft_reject_inet_eval`, `reject_tg`, and `reject_tg6`. Those look pretty straightforward, clearly the rejection mechanisms for different IP versions and potentially traffic groups. But what about these others? `nft_meta_get_eval_rtclassid`, `nft_rt_get_eval`, and `nft_xfrm_get_eval_out`? Hmm, those names suggest they're also evaluation functions, but likely for more specialized purposes. They seem to be dealing with things like metadata, routing, and xfrm (IPsec, I'm guessing). Let's break it down further, and I remember `nft_meta_get_eval` is the key entry for meta, and `nft_rt_get_eval` for rt. Also, I now see `nft_xfrm_get_eval_out` is the primary entry point for XFRM evaluations. So they have a clear hierarchy. Let's dig into `nft_meta_get_eval`. That's where I need to start.
10/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "nft_meta_get_eval" } Results: { "Output": "include/net/netfilter/nf_tables_core.h=131=struct nft_pktinfo;\ninclude/net/netfilter/nf_tables_core.h:132:void nft_meta_get_eval(const struct nft_expr expr,\ninclude/net/netfilter/nf_tables_core.h-133-\t\t struct nft_regs regs, const struct nft_pktinfo pkt);\n--\ninclude/net/netfilter/nft_meta.h=29=int nft_meta_set_dump(struct sk_buff skb,\n--\ninclude/net/netfilter/nft_meta.h-31-\ninclude/net/netfilter/nft_meta.h:32:void nft_meta_get_eval(const struct nft_expr expr,\ninclude/net/netfilter/nft_meta.h-33-\t\t struct nft_regs regs,\n--\nnet/bridge/netfilter/nft_meta_bridge.c=24=static void nft_meta_bridge_get_eval(const struct nft_expr expr,\n--\nnet/bridge/netfilter/nft_meta_bridge.c-73-\tdefault:\nnet/bridge/netfilter/nft_meta_bridge.c:74:\t\treturn nft_meta_get_eval(expr, regs, pkt);\nnet/bridge/netfilter/nft_meta_bridge.c-75-\t}\n--\nnet/netfilter/nf_tables_core.c=203=static void expr_call_ops_eval(const struct nft_expr expr,\n--\nnet/netfilter/nf_tables_core.c-220-\tX(e, nft_counter_eval);\nnet/netfilter/nf_tables_core.c:221:\tX(e, nft_meta_get_eval);\nnet/netfilter/nf_tables_core.c-222-\tX(e, nft_lookup_eval);\n--\nnet/netfilter/nft_meta.c=63=static noinline_for_stack void\nnet/netfilter/nft_meta.c:64:nft_meta_get_eval_time(enum nft_meta_keys key,\nnet/netfilter/nft_meta.c-65-\t\t u32 dest)\n--\nnet/netfilter/nft_meta.c=82=static noinline bool\nnet/netfilter/nft_meta.c:83:nft_meta_get_eval_pkttype_lo(const struct nft_pktinfo pkt,\nnet/netfilter/nft_meta.c-84-\t\t\t u32 dest)\n--\nnet/netfilter/nft_meta.c=132=static noinline bool\nnet/netfilter/nft_meta.c:133:nft_meta_get_eval_skugid(enum nft_meta_keys key,\nnet/netfilter/nft_meta.c-134-\t\t\t u32 dest,\n--\nnet/netfilter/nft_meta.c=171=static noinline bool\nnet/netfilter/nft_meta.c:172:nft_meta_get_eval_cgroup(u32 dest, const struct nft_pktinfo pkt)\nnet/netfilter/nft_meta.c-173-{\n--\nnet/netfilter/nft_meta.c-183-\nnet/netfilter/nft_meta.c:184:static noinline bool nft_meta_get_eval_kind(enum nft_meta_keys key,\nnet/netfilter/nft_meta.c-185-\t\t\t\t\t u32 dest,\n--\nnet/netfilter/nft_meta.c=227=static bool nft_meta_store_ifgroup(u32 dest, const struct net_device dev)\n--\nnet/netfilter/nft_meta.c-235-\nnet/netfilter/nft_meta.c:236:static bool nft_meta_get_eval_ifname(enum nft_meta_keys key, u32 dest,\nnet/netfilter/nft_meta.c-237-\t\t\t\t const struct nft_pktinfo pkt)\n--\nnet/netfilter/nft_meta.c=280=static noinline bool\nnet/netfilter/nft_meta.c:281:nft_meta_get_eval_rtclassid(const struct sk_buff skb, u32 dest)\nnet/netfilter/nft_meta.c-282-{\n--\nnet/netfilter/nft_meta.c-293-\nnet/netfilter/nft_meta.c:294:static noinline u32 nft_meta_get_eval_sdif(const struct nft_pktinfo pkt)\nnet/netfilter/nft_meta.c-295-{\n--\nnet/netfilter/nft_meta.c=306=static noinline void\nnet/netfilter/nft_meta.c:307:nft_meta_get_eval_sdifname(u32 dest, const struct nft_pktinfo pkt)\nnet/netfilter/nft_meta.c-308-{\nnet/netfilter/nft_meta.c:309:\tu32 sdif = nft_meta_get_eval_sdif(pkt);\nnet/netfilter/nft_meta.c-310-\tconst struct net_device dev;\n--\nnet/netfilter/nft_meta.c=316=static void nft_meta_pktinfo_may_update(struct nft_pktinfo pkt)\n--\nnet/netfilter/nft_meta.c-363-\nnet/netfilter/nft_meta.c:364:void nft_meta_get_eval(const struct nft_expr expr,\nnet/netfilter/nft_meta.c-365-\t\t struct nft_regs regs,\n--\nnet/netfilter/nft_meta.c-402-\tcase NFT_META_OIFGROUP:\nnet/netfilter/nft_meta.c:403:\t\tif (!nft_meta_get_eval_ifname(priv-\u003ekey, dest, pkt))\nnet/netfilter/nft_meta.c-404-\t\t\tgoto err;\n--\nnet/netfilter/nft_meta.c-407-\tcase NFT_META_SKGID:\nnet/netfilter/nft_meta.c:408:\t\tif (!nft_meta_get_eval_skugid(priv-\u003ekey, dest, pkt))\nnet/netfilter/nft_meta.c-409-\t\t\tgoto err;\n--\nnet/netfilter/nft_meta.c-412-\tcase NFT_META_RTCLASSID:\nnet/netfilter/nft_meta.c:413:\t\tif (!nft_meta_get_eval_rtclassid(skb, dest))\nnet/netfilter/nft_meta.c-414-\t\t\tgoto err;\n--\nnet/netfilter/nft_meta.c-427-\nnet/netfilter/nft_meta.c:428:\t\tif (!nft_meta_get_eval_pkttype_lo(pkt, dest))\nnet/netfilter/nft_meta.c-429-\t\t\tgoto err;\n--\nnet/netfilter/nft_meta.c-435-\tcase NFT_META_CGROUP:\nnet/netfilter/nft_meta.c:436:\t\tif (!nft_meta_get_eval_cgroup(dest, pkt))\nnet/netfilter/nft_meta.c-437-\t\t\tgoto err;\n--\nnet/netfilter/nft_meta.c-449-\tcase NFT_META_OIFKIND:\nnet/netfilter/nft_meta.c:450:\t\tif (!nft_meta_get_eval_kind(priv-\u003ekey, dest, pkt))\nnet/netfilter/nft_meta.c-451-\t\t\tgoto err;\n--\nnet/netfilter/nft_meta.c-455-\tcase NFT_META_TIME_HOUR:\nnet/netfilter/nft_meta.c:456:\t\tnft_meta_get_eval_time(priv-\u003ekey, dest);\nnet/netfilter/nft_meta.c-457-\t\tbreak;\nnet/netfilter/nft_meta.c-458-\tcase NFT_META_SDIF:\nnet/netfilter/nft_meta.c:459:\t\t*dest = nft_meta_get_eval_sdif(pkt);\nnet/netfilter/nft_meta.c-460-\t\tbreak;\nnet/netfilter/nft_meta.c-461-\tcase NFT_META_SDIFNAME:\nnet/netfilter/nft_meta.c:462:\t\tnft_meta_get_eval_sdifname(dest, pkt);\nnet/netfilter/nft_meta.c-463-\t\tbreak;\n--\nnet/netfilter/nft_meta.c-472-}\nnet/netfilter/nft_meta.c:473:EXPORT_SYMBOL_GPL(nft_meta_get_eval);\nnet/netfilter/nft_meta.c-474-\n--\nnet/netfilter/nft_meta.c=803=static const struct nft_expr_ops nft_meta_get_ops = {\n--\nnet/netfilter/nft_meta.c-805-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_meta)),\nnet/netfilter/nft_meta.c:806:\t.eval\t\t= nft_meta_get_eval,\nnet/netfilter/nft_meta.c-807-\t.init\t\t= nft_meta_get_init,\n" }
11/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 18547 output: 21 thoughts: 29 Thoughts: Okay, here's my take on those thoughts, framed as my own: Considering Evaluation Functions for Focus Right, so I'm thinking about where to start really digging in. `nft_meta_get_eval` seems like a solid, obvious starting point for focusing on evaluation functions. It's a key function, but is it the best? My experience is that one function is rarely the whole story. Let's see… What about `nft_rt_get_eval`? I need to consider it, too. My gut tells me this could lead to some interesting insights. It's probably worth investigating its role and how it relates to `nft_meta_get_eval`. I need to assess how these two, and likely others, interact to get a full picture of the evaluation process.
12/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "nft_rt_get_eval" } Results: { "Output": "include/net/netfilter/nf_tables_core.h=148=void nft_dynset_eval(const struct nft_expr expr,\ninclude/net/netfilter/nf_tables_core.h-149-\t\t struct nft_regs regs, const struct nft_pktinfo pkt);\ninclude/net/netfilter/nf_tables_core.h:150:void nft_rt_get_eval(const struct nft_expr expr,\ninclude/net/netfilter/nf_tables_core.h-151-\t\t struct nft_regs regs, const struct nft_pktinfo pkt);\n--\nnet/netfilter/nf_tables_core.c=203=static void expr_call_ops_eval(const struct nft_expr expr,\n--\nnet/netfilter/nf_tables_core.c-229-\tX(e, nft_dynset_eval);\nnet/netfilter/nf_tables_core.c:230:\tX(e, nft_rt_get_eval);\nnet/netfilter/nf_tables_core.c-231-\tX(e, nft_bitwise_eval);\n--\nnet/netfilter/nft_rt.c=22=static u16 get_tcpmss(const struct nft_pktinfo pkt, const struct dst_entry skbdst)\n--\nnet/netfilter/nft_rt.c-53-\nnet/netfilter/nft_rt.c:54:void nft_rt_get_eval(const struct nft_expr expr,\nnet/netfilter/nft_rt.c-55-\t\t struct nft_regs *regs,\n--\nnet/netfilter/nft_rt.c=193=static const struct nft_expr_ops nft_rt_get_ops = {\n--\nnet/netfilter/nft_rt.c-195-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_rt)),\nnet/netfilter/nft_rt.c:196:\t.eval\t\t= nft_rt_get_eval,\nnet/netfilter/nft_rt.c-197-\t.init\t\t= nft_rt_get_init,\n" }
13/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 19311 output: 22 thoughts: 32 Thoughts: Here's my take on those thoughts: Evaluating Potential Focus Symbols for Network Filter Rules Okay, so I'm thinking about good symbols to really home in on when digging into the network filter evaluation process. We're already using `nft_rt_get_eval`, and that's solid – it's definitely a key point to examine. But I want to make sure we're not missing anything critical. The `nft_xfrm_get_eval_out` function just popped into my head. I need to consider whether it's another good candidate for closer inspection, and if it is, I can determine why and where it may be beneficial to analyze. I need to map the evaluation function more comprehensively.
14/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "nft_xfrm_get_eval" } Results: { "Output": "net/netfilter/nft_xfrm.c=120=static void nft_xfrm_state_get_key(const struct nft_xfrm priv,\n--\nnet/netfilter/nft_xfrm.c-160-\nnet/netfilter/nft_xfrm.c:161:static void nft_xfrm_get_eval_in(const struct nft_xfrm priv,\nnet/netfilter/nft_xfrm.c-162-\t\t\t\t struct nft_regs regs,\n--\nnet/netfilter/nft_xfrm.c-176-\nnet/netfilter/nft_xfrm.c:177:static void nft_xfrm_get_eval_out(const struct nft_xfrm priv,\nnet/netfilter/nft_xfrm.c-178-\t\t\t\t struct nft_regs regs,\n--\nnet/netfilter/nft_xfrm.c-201-\nnet/netfilter/nft_xfrm.c:202:static void nft_xfrm_get_eval(const struct nft_expr expr,\nnet/netfilter/nft_xfrm.c-203-\t\t\t struct nft_regs *regs,\n--\nnet/netfilter/nft_xfrm.c-209-\tcase XFRM_POLICY_IN:\nnet/netfilter/nft_xfrm.c:210:\t\tnft_xfrm_get_eval_in(priv, regs, pkt);\nnet/netfilter/nft_xfrm.c-211-\t\tbreak;\nnet/netfilter/nft_xfrm.c-212-\tcase XFRM_POLICY_OUT:\nnet/netfilter/nft_xfrm.c:213:\t\tnft_xfrm_get_eval_out(priv, regs, pkt);\nnet/netfilter/nft_xfrm.c-214-\t\tbreak;\n--\nnet/netfilter/nft_xfrm.c=270=static const struct nft_expr_ops nft_xfrm_get_ops = {\n--\nnet/netfilter/nft_xfrm.c-272-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_xfrm)),\nnet/netfilter/nft_xfrm.c:273:\t.eval\t\t= nft_xfrm_get_eval,\nnet/netfilter/nft_xfrm.c-274-\t.init\t\t= nft_xfrm_get_init,\n" }
15/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 20122 output: 21 thoughts: 30 Thoughts: Here's my take on those thoughts, from an expert's perspective: Diving into the NFT Transformation Logic Okay, `nft_xfrm_get_eval` seems like a key function to zero in on right now. It's a solid starting point for understanding how the Network Filter Table (NFT) framework handles transformations. I suspect it's responsible for retrieving and evaluating the specific transformation to be applied, based on the current context and packet data. My gut says this is where the policy selection and transformation setup intertwine. I'm especially keen to see how the XFRM-related details are resolved. Next, I should take a look at `dev_fill_forward_path`. This sounds promising, possibly related to path selection or routing within the device context, which is absolutely critical for performance. I expect this function plays a key part in how the transformed packets are forwarded within the system. Understanding this is essential to seeing how the packet flows are handled with transformations applied. Let's see how the packet is actually routed!
16/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "dev_fill_forward_path" } Results: { "Output": "drivers/net/ethernet/airoha/airoha_ppe.c=282=static int airoha_ppe_get_wdma_info(struct net_device dev, const u8 addr,\n--\ndrivers/net/ethernet/airoha/airoha_ppe.c-292-\trcu_read_lock();\ndrivers/net/ethernet/airoha/airoha_ppe.c:293:\terr = dev_fill_forward_path(dev, addr, \u0026stack);\ndrivers/net/ethernet/airoha/airoha_ppe.c-294-\trcu_read_unlock();\n--\ndrivers/net/ethernet/airoha/airoha_ppe.c-307-err_out:\ndrivers/net/ethernet/airoha/airoha_ppe.c:308:\tdev_fill_forward_path_release(\u0026stack);\ndrivers/net/ethernet/airoha/airoha_ppe.c-309-\n--\ndrivers/net/ethernet/mediatek/mtk_ppe_offload.c=92=mtk_flow_get_wdma_info(struct net_device dev, const u8 addr, struct mtk_wdma_info info)\n--\ndrivers/net/ethernet/mediatek/mtk_ppe_offload.c-104-\trcu_read_lock();\ndrivers/net/ethernet/mediatek/mtk_ppe_offload.c:105:\terr = dev_fill_forward_path(dev, addr, \u0026stack);\ndrivers/net/ethernet/mediatek/mtk_ppe_offload.c-106-\trcu_read_unlock();\n--\ndrivers/net/ethernet/mediatek/mtk_ppe_offload.c-121-err_out:\ndrivers/net/ethernet/mediatek/mtk_ppe_offload.c:122:\tdev_fill_forward_path_release(\u0026stack);\ndrivers/net/ethernet/mediatek/mtk_ppe_offload.c-123-\n--\ninclude/linux/netdevice.h=3428=int dev_fill_metadata_dst(struct net_device dev, struct sk_buff skb);\ninclude/linux/netdevice.h:3429:int dev_fill_forward_path(const struct net_device dev, const u8 daddr,\ninclude/linux/netdevice.h-3430-\t\t\t struct net_device_path_stack stack);\ninclude/linux/netdevice.h:3431:void dev_fill_forward_path_release(struct net_device_path_stack stack);\ninclude/linux/netdevice.h-3432-struct net_device dev_get_by_name(struct net net, const char name);\n--\nnet/8021q/vlan_dev.c=756=static int vlan_dev_get_iflink(const struct net_device dev)\n--\nnet/8021q/vlan_dev.c-762-\nnet/8021q/vlan_dev.c:763:static int vlan_dev_fill_forward_path(struct net_device_path_ctx ctx,\nnet/8021q/vlan_dev.c-764-\t\t\t\t struct net_device_path path)\n--\nnet/8021q/vlan_dev.c=1078=static const struct net_device_ops vlan_netdev_ops = {\n--\nnet/8021q/vlan_dev.c-1109-\t.ndo_get_iflink\t\t= vlan_dev_get_iflink,\nnet/8021q/vlan_dev.c:1110:\t.ndo_fill_forward_path\t= vlan_dev_fill_forward_path,\nnet/8021q/vlan_dev.c-1111-\t.ndo_hwtstamp_get\t= vlan_hwtstamp_get,\n--\nnet/core/dev.c=743=static struct net_device_path dev_fwd_path(struct net_device_path_stack stack)\n--\nnet/core/dev.c-750-\nnet/core/dev.c:751:void dev_fill_forward_path_release(struct net_device_path_stack stack)\nnet/core/dev.c-752-{\n--\nnet/core/dev.c-769-}\nnet/core/dev.c:770:EXPORT_SYMBOL_GPL(dev_fill_forward_path_release);\nnet/core/dev.c-771-\nnet/core/dev.c:772:int dev_fill_forward_path(const struct net_device dev, const u8 daddr,\nnet/core/dev.c-773-\t\t\t struct net_device_path_stack stack)\n--\nnet/core/dev.c-812-err_out:\nnet/core/dev.c:813:\tdev_fill_forward_path_release(stack);\nnet/core/dev.c-814-\n--\nnet/core/dev.c-816-}\nnet/core/dev.c:817:EXPORT_SYMBOL_GPL(dev_fill_forward_path);\nnet/core/dev.c-818-\n--\nnet/mac80211/iface.c=979=static const struct net_device_ops ieee80211_monitorif_ops = {\n--\nnet/mac80211/iface.c-988-\nnet/mac80211/iface.c:989:static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx ctx,\nnet/mac80211/iface.c-990-\t\t\t\t\t struct net_device_path path)\n--\nnet/mac80211/iface.c=1047=static const struct net_device_ops ieee80211_dataif_8023_ops = {\n--\nnet/mac80211/iface.c-1053-\t.ndo_set_mac_address\t= ieee80211_change_mac,\nnet/mac80211/iface.c:1054:\t.ndo_fill_forward_path\t= ieee80211_netdev_fill_forward_path,\nnet/mac80211/iface.c-1055-\t.ndo_setup_tc\t\t= ieee80211_netdev_setup_tc,\n--\nnet/netfilter/nf_flow_table_path.c=36=static bool nft_is_valid_ether_device(const struct net_device dev)\n--\nnet/netfilter/nf_flow_table_path.c-44-\nnet/netfilter/nf_flow_table_path.c:45:static int nft_dev_fill_forward_path(const struct dst_entry dst_cache,\nnet/netfilter/nf_flow_table_path.c-46-\t\t\t\t const struct nf_conn ct,\n--\nnet/netfilter/nf_flow_table_path.c-73-out:\nnet/netfilter/nf_flow_table_path.c:74:\treturn dev_fill_forward_path(dev, ha, stack);\nnet/netfilter/nf_flow_table_path.c-75-}\n--\nnet/netfilter/nf_flow_table_path.c=97=static int nft_dev_path_info(struct net_device_path_stack stack,\n--\nnet/netfilter/nf_flow_table_path.c-191-err_out:\nnet/netfilter/nf_flow_table_path.c:192:\tdev_fill_forward_path_release(stack);\nnet/netfilter/nf_flow_table_path.c-193-\n--\nnet/netfilter/nf_flow_table_path.c=214=static int nft_dev_forward_path(const struct nft_pktinfo pkt,\n--\nnet/netfilter/nf_flow_table_path.c-225-\nnet/netfilter/nf_flow_table_path.c:226:\tif (nft_dev_fill_forward_path(dst, ct, dir, ha, \u0026stack) \u003c 0 \|\|\nnet/netfilter/nf_flow_table_path.c-227-\t nft_dev_path_info(\u0026stack, \u0026info, ha, ft) \u003c 0)\n" }
17/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 22549 output: 23 thoughts: 104 Thoughts: Tracing the Flow Offload Path Okay, so I'm trying to understand the control flow here, specifically how traffic gets offloaded in the Netfilter framework. Let's see... I've got `dev_fill_forward_path`, that's the core function. It's called from `nft_dev_fill_forward_path`, which in turn is called from `nft_dev_forward_path`. Now, `nft_dev_forward_path` is called by `nft_flow_route`, and finally that's all hooked into `nft_flow_offload_eval`. That makes `nft_flow_offload_eval` the key entry point to look at, right? This looks like a solid starting point for a more focused analysis. Now, since we're talking about offloading, let me also check how this interacts with TCP connection tracking. I'll need to look at `nf_conntrack_tcp_packet` next.
18/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "nf_conntrack_tcp_packet" } Results: { "Output": "include/net/netfilter/nf_conntrack_l4proto.h=105=int nf_conntrack_udp_packet(struct nf_conn ct,\n--\ninclude/net/netfilter/nf_conntrack_l4proto.h-109-\t\t\t const struct nf_hook_state state);\ninclude/net/netfilter/nf_conntrack_l4proto.h:110:int nf_conntrack_tcp_packet(struct nf_conn ct,\ninclude/net/netfilter/nf_conntrack_l4proto.h-111-\t\t\t struct sk_buff skb,\n--\nnet/netfilter/nf_conntrack_core.c=1969=static int nf_conntrack_handle_packet(struct nf_conn ct,\n--\nnet/netfilter/nf_conntrack_core.c-1976-\tcase IPPROTO_TCP:\nnet/netfilter/nf_conntrack_core.c:1977:\t\treturn nf_conntrack_tcp_packet(ct, skb, dataoff,\nnet/netfilter/nf_conntrack_core.c-1978-\t\t\t\t\t ctinfo, state);\n--\nnet/netfilter/nf_conntrack_proto_tcp.c=952=static void nf_ct_tcp_state_reset(struct ip_ct_tcp_state state)\n--\nnet/netfilter/nf_conntrack_proto_tcp.c-962-/* Returns verdict for packet, or -1 for invalid. /\nnet/netfilter/nf_conntrack_proto_tcp.c:963:int nf_conntrack_tcp_packet(struct nf_conn ct,\nnet/netfilter/nf_conntrack_proto_tcp.c-964-\t\t\t struct sk_buff *skb,\n" }
19/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 23352 output: 26 thoughts: 109 Thoughts: Diving into the Conntrack Mechanism Okay, so I'm honing in on the TCP packet handling within the Netfilter connection tracking system. Right, `nf_conntrack_tcp_packet` seems like a good starting point for a deep dive. I know it gets called from `nf_conntrack_handle_packet`, which itself is invoked by `nf_conntrack_in`. And `nf_conntrack_in` is, essentially, the main entry point for the entire conntrack process. So, working backwards, I've got the call chain mapped in my head. Now, let's see how things are structured. Let's shift our focus to `get_ct_or_tuple_from_skb` in `net/netfilter/nf_conncount.c`. That should give me a good handle on how the connection tracking information gets fetched.
20/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "get_ct_or_tuple_from_skb" } Results: { "Output": "net/netfilter/nf_conncount.c=102=find_or_evict(struct net net, struct nf_conncount_list list,\n--\nnet/netfilter/nf_conncount.c-129-\nnet/netfilter/nf_conncount.c:130:static bool get_ct_or_tuple_from_skb(struct net net,\nnet/netfilter/nf_conncount.c-131-\t\t\t\t const struct sk_buff skb,\n--\nnet/netfilter/nf_conncount.c=169=static int __nf_conncount_add(struct net net,\n--\nnet/netfilter/nf_conncount.c-183-\nnet/netfilter/nf_conncount.c:184:\tif (!get_ct_or_tuple_from_skb(net, skb, l3num, \u0026ct, \u0026tuple, \u0026zone, \u0026refcounted))\nnet/netfilter/nf_conncount.c-185-\t\treturn -ENOENT;\n--\nnet/netfilter/nf_conncount.c=403=insert_tree(struct net net,\n--\nnet/netfilter/nf_conncount.c-461-\nnet/netfilter/nf_conncount.c:462:\tif (get_ct_or_tuple_from_skb(net, skb, l3num, \u0026ct, \u0026tuple, \u0026zone, \u0026refcounted)) {\nnet/netfilter/nf_conncount.c-463-\t\t/* expected case: match, insert new node */\n" }
21/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24078 output: 20 thoughts: 114 Thoughts: Analyzing Connection Limit Evaluation Okay, let's break this down. From what I'm seeing in the call graphs, `__nf_conncount_add` and `insert_tree` are the entry points. `insert_tree` is ultimately called by `nf_conncount_count`, which makes sense. Similarly, `__nf_conncount_add` has its origins in `nf_conncount_add`. Then, `nf_conncount_count` itself feeds into both `xt_connlimit_eval` and `nft_connlimit_eval`. Given that, `nft_connlimit_eval` looks like the most strategically important point to focus on here. It's the cleanest place to start looking at how connection limits are actually evaluated within the Netfilter framework. I'll begin my deeper dive there. This will give me a better understanding of how the counting mechanism interacts with the Netfilter table.
22/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "nft_connlimit_eval" } Results: { "Output": "net/netfilter/nft_connlimit.c=176=static struct nft_object_type nft_connlimit_obj_type __read_mostly = {\n--\nnet/netfilter/nft_connlimit.c-183-\nnet/netfilter/nft_connlimit.c:184:static void nft_connlimit_eval(const struct nft_expr expr,\nnet/netfilter/nft_connlimit.c-185-\t\t\t struct nft_regs regs,\n--\nnet/netfilter/nft_connlimit.c=251=static const struct nft_expr_ops nft_connlimit_ops = {\n--\nnet/netfilter/nft_connlimit.c-253-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_connlimit)),\nnet/netfilter/nft_connlimit.c:254:\t.eval\t\t= nft_connlimit_eval,\nnet/netfilter/nft_connlimit.c-255-\t.init\t\t= nft_connlimit_init,\n" }
23/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 24672 output: 30 thoughts: 311 Thoughts: Analyzing NF_TABLES Symbol Dependencies Okay, let's break this down. My initial focus is on these symbols: `nft_flow_offload_eval`, `nft_reject_ipv4_eval`, `nft_reject_ipv6_eval`, `nft_reject_inet_eval`, `nft_meta_get_eval`, `nft_rt_get_eval`, `nft_xfrm_get_eval`, `nft_connlimit_eval`, and `nf_conntrack_tcp_packet`. The goal, as always, is to map these kernel symbols to their corresponding Kconfig options. First pass: `nft_flow_offload_eval` seems to be linked to `NF_FLOW_TABLE`, which makes sense. Then `nft_reject_ipv4_eval` and `nft_reject_ipv6_eval` map directly to `NFT_REJECT_IPV4` and `NFT_REJECT_IPV6` respectively, and `nft_reject_inet_eval` corresponds to `NFT_REJECT_INET` - standard. Now, things get a little interesting with `nft_meta_get_eval`. Wait, isn't that functionality pretty fundamental? I'm almost certain `NFT_META` is built-in. I'll need to double check the nf_tables code and Kconfig to be absolutely sure, just to be thorough. Similarly, I need to verify `nft_rt_get_eval`. I'm going to quickly check the Kconfig entry for `NFT_RT` to confirm that. Gotta be precise. `nft_xfrm_get_eval` maps to `NFT_XFRM` and `nft_connlimit_eval` to `NFT_CONNLIMIT` which seem straightforward. Finally, `nf_conntrack_tcp_packet` appears to depend on `NF_CONNTRACK`. All of these look solid but a quick double check is always smart.
24/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "config NFT_", "PathPrefix": "net/netfilter/Kconfig" } Results: { "Output": "net/netfilter/Kconfig=480=config NF_TABLES_NETDEV\n--\nnet/netfilter/Kconfig-484-\nnet/netfilter/Kconfig:485:config NFT_NUMGEN\nnet/netfilter/Kconfig-486-\ttristate \"Netfilter nf_tables number generator module\"\n--\nnet/netfilter/Kconfig-490-\nnet/netfilter/Kconfig:491:config NFT_CT\nnet/netfilter/Kconfig-492-\tdepends on NF_CONNTRACK\n--\nnet/netfilter/Kconfig-497-\nnet/netfilter/Kconfig:498:config NFT_EXTHDR_DCCP\nnet/netfilter/Kconfig-499-\tbool \"Netfilter nf_tables exthdr DCCP support (DEPRECATED)\"\n--\nnet/netfilter/Kconfig-503-\nnet/netfilter/Kconfig:504:config NFT_FLOW_OFFLOAD\nnet/netfilter/Kconfig-505-\tdepends on NF_CONNTRACK \u0026\u0026 NF_FLOW_TABLE\n--\nnet/netfilter/Kconfig-510-\nnet/netfilter/Kconfig:511:config NFT_CONNLIMIT\nnet/netfilter/Kconfig-512-\ttristate \"Netfilter nf_tables connlimit module\"\n--\nnet/netfilter/Kconfig-519-\nnet/netfilter/Kconfig:520:config NFT_LOG\nnet/netfilter/Kconfig-521-\ttristate \"Netfilter nf_tables log module\"\n--\nnet/netfilter/Kconfig-525-\nnet/netfilter/Kconfig:526:config NFT_LIMIT\nnet/netfilter/Kconfig-527-\ttristate \"Netfilter nf_tables limit module\"\n--\nnet/netfilter/Kconfig-531-\nnet/netfilter/Kconfig:532:config NFT_MASQ\nnet/netfilter/Kconfig-533-\tdepends on NF_CONNTRACK\n--\nnet/netfilter/Kconfig-540-\nnet/netfilter/Kconfig:541:config NFT_REDIR\nnet/netfilter/Kconfig-542-\tdepends on NF_CONNTRACK\n--\nnet/netfilter/Kconfig-549-\nnet/netfilter/Kconfig:550:config NFT_NAT\nnet/netfilter/Kconfig-551-\tdepends on NF_CONNTRACK\n--\nnet/netfilter/Kconfig-558-\nnet/netfilter/Kconfig:559:config NFT_TUNNEL\nnet/netfilter/Kconfig-560-\ttristate \"Netfilter nf_tables tunnel module\"\n--\nnet/netfilter/Kconfig-564-\nnet/netfilter/Kconfig:565:config NFT_QUEUE\nnet/netfilter/Kconfig-566-\tdepends on NETFILTER_NETLINK_QUEUE\n--\nnet/netfilter/Kconfig-571-\nnet/netfilter/Kconfig:572:config NFT_QUOTA\nnet/netfilter/Kconfig-573-\ttristate \"Netfilter nf_tables quota module\"\n--\nnet/netfilter/Kconfig-577-\nnet/netfilter/Kconfig:578:config NFT_REJECT\nnet/netfilter/Kconfig-579-\tdefault m if NETFILTER_ADVANCED=n\n--\nnet/netfilter/Kconfig-585-\nnet/netfilter/Kconfig:586:config NFT_REJECT_INET\nnet/netfilter/Kconfig-587-\tdepends on NF_TABLES_INET\n--\nnet/netfilter/Kconfig-590-\nnet/netfilter/Kconfig:591:config NFT_COMPAT\nnet/netfilter/Kconfig-592-\tdepends on NETFILTER_XTABLES\n--\nnet/netfilter/Kconfig-598-\nnet/netfilter/Kconfig:599:config NFT_HASH\nnet/netfilter/Kconfig-600-\ttristate \"Netfilter nf_tables hash module\"\n--\nnet/netfilter/Kconfig-604-\nnet/netfilter/Kconfig:605:config NFT_FIB\nnet/netfilter/Kconfig-606-\ttristate\nnet/netfilter/Kconfig-607-\nnet/netfilter/Kconfig:608:config NFT_FIB_INET\nnet/netfilter/Kconfig-609-\tdepends on NF_TABLES_INET\n--\nnet/netfilter/Kconfig-617-\nnet/netfilter/Kconfig:618:config NFT_XFRM\nnet/netfilter/Kconfig-619-\ttristate \"Netfilter nf_tables xfrm/IPSec security association matching\"\n--\nnet/netfilter/Kconfig-624-\nnet/netfilter/Kconfig:625:config NFT_SOCKET\nnet/netfilter/Kconfig-626-\ttristate \"Netfilter nf_tables socket match support\"\n--\nnet/netfilter/Kconfig-632-\nnet/netfilter/Kconfig:633:config NFT_OSF\nnet/netfilter/Kconfig-634-\ttristate \"Netfilter nf_tables passive OS fingerprint support\"\n--\nnet/netfilter/Kconfig-639-\nnet/netfilter/Kconfig:640:config NFT_TPROXY\nnet/netfilter/Kconfig-641-\ttristate \"Netfilter nf_tables tproxy support\"\n--\nnet/netfilter/Kconfig-648-\nnet/netfilter/Kconfig:649:config NFT_SYNPROXY\nnet/netfilter/Kconfig-650-\ttristate \"Netfilter nf_tables SYNPROXY expression support\"\n--\nnet/netfilter/Kconfig=662=config NF_DUP_NETDEV\n--\nnet/netfilter/Kconfig-667-\nnet/netfilter/Kconfig:668:config NFT_DUP_NETDEV\nnet/netfilter/Kconfig-669-\ttristate \"Netfilter nf_tables netdev packet duplication support\"\n--\nnet/netfilter/Kconfig-673-\nnet/netfilter/Kconfig:674:config NFT_FWD_NETDEV\nnet/netfilter/Kconfig-675-\ttristate \"Netfilter nf_tables netdev packet forwarding support\"\n--\nnet/netfilter/Kconfig-679-\nnet/netfilter/Kconfig:680:config NFT_FIB_NETDEV\nnet/netfilter/Kconfig-681-\tdepends on NFT_FIB_IPV4\n--\nnet/netfilter/Kconfig-688-\nnet/netfilter/Kconfig:689:config NFT_REJECT_NETDEV\nnet/netfilter/Kconfig-690-\tdepends on NFT_REJECT_IPV4\n" }
25/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 27122 output: 29 thoughts: 38 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: Navigating the Netfilter Landscape Hmm, something doesn't feel quite right. I was expecting `NFT_META` and `NFT_RT` to be present in `net/netfilter/Kconfig`, but I'm drawing a blank. That seems odd, given their roles. Let me quickly double-check the configuration structure. The Kconfig files usually dictate the options we have available. It looks like I need to shift my focus. Let's step back and take a look at the Makefile within the `net/netfilter` directory to see how those symbols are actually included. The Makefile is where the build process is defined. It should offer clues as to how these features are conditionally compiled or configured, which may explain their absence in Kconfig. It's time to follow the build recipe.
26/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "nft_meta", "PathPrefix": "net/netfilter/Makefile" } Results: { "Output": "net/netfilter/Makefile=87=nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \\\n--\nnet/netfilter/Makefile-89-\t\t nft_bitwise.o nft_byteorder.o nft_payload.o nft_lookup.o \\\nnet/netfilter/Makefile:90:\t\t nft_dynset.o nft_meta.o nft_rt.o nft_exthdr.o nft_last.o \\\nnet/netfilter/Makefile-91-\t\t nft_counter.o nft_objref.o nft_inner.o \\\n" }
27/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 27542 output: 35 thoughts: 57 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: Quick NF_TABLES Refresher Right, so I'm focusing on the `nf_tables` subsystem, and I need to consider which modules are required. I see that `nft_meta` and `nft_rt` are fundamental components, core to `nf_tables`. That means, and this seems logical, `NF_TABLES` itself should be sufficient for the core functionality I'm interested in. I should check, though, about these specific modules: `NFT_REJECT_IPV4` and `NFT_REJECT_IPV6`. I'll need to remember to confirm those dependencies, they seem less core but still quite important in many cases.
28/2	2026/08/02 00:15	tool	grepper	0m Args: { "Expression": "config NFT_REJECT", "PathPrefix": "net/ipv4/netfilter/Kconfig" } Results: { "Output": "net/ipv4/netfilter/Kconfig=40=if NF_TABLES_IPV4\nnet/ipv4/netfilter/Kconfig-41-\nnet/ipv4/netfilter/Kconfig:42:config NFT_REJECT_IPV4\nnet/ipv4/netfilter/Kconfig-43-\tselect NF_REJECT_IPV4\n" }
29/2	2026/08/02 00:15	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 27895 output: 35 thoughts: 13 Thoughts: Okay, here's my interpretation of that seemingly simple statement, crafted as though it's a direct reflection of my own internal thought process, assuming I'm well-versed in kernel development: Initial Assessment: A Kconfig Revelation Alright, "And `net/ipv6/netfilter/Kconfig`"... that's intriguing. It's essentially a pointer, a breadcrumb trail. My mind immediately jumps to the implication: we're talking about IPv6-specific netfilter configuration. "And" implies a continuation, something related to the topic at hand. It suggests further details or perhaps a different perspective are about to be introduced. This strongly suggests we're delving into the realm of network packet filtering within the IPv6 protocol stack. The fact it is the Kconfig hints that we are dealing with configuration options related to IPv6 netfilter. It reminds me of the importance of modularity in the kernel. This particular Kconfig file is where the settings that determine which netfilter modules are compiled into the IPv6 network stack are. This information has likely come up in discussions about configuring or debugging IPv6 firewall behavior, or perhaps during an overview of the kernel's network security features. It's now time to explore this specific file.
30/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "config NFT_REJECT", "PathPrefix": "net/ipv6/netfilter/Kconfig" } Results: { "Output": "net/ipv6/netfilter/Kconfig=36=if NF_TABLES_IPV6\nnet/ipv6/netfilter/Kconfig-37-\nnet/ipv6/netfilter/Kconfig:38:config NFT_REJECT_IPV6\nnet/ipv6/netfilter/Kconfig-39-\tselect NF_REJECT_IPV6\n" }
31/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 28300 output: 33 thoughts: 421 Thoughts: Analyzing Netfilter Configuration for Optimal Performance Okay, so I'm looking at these configurations required for this flow table setup. Seems like we need `NF_TABLES`, `NF_FLOW_TABLE`, and `NFT_FLOW_OFFLOAD` as the core components, naturally. Then, for the reject functionality, we have `NFT_REJECT_IPV4`, `NFT_REJECT_IPV6`, and `NFT_REJECT_INET`. Finally, `NFT_XFRM`, `NFT_CONNLIMIT`, and the connection tracking bits with `NF_CONNTRACK` are in the mix as well. Let's quickly confirm that `NFT_REJECT_INET` is actually defined in the Kconfig – yep, it's there in `net/netfilter/Kconfig`. Good. Now, let's double-check the dependencies. Seems `NF_REJECT_IPV4` and `NF_REJECT_IPV6` are directly selected by `NFT_REJECT_IPV4` and `NFT_REJECT_IPV6`. Ah, but hold on... the patch also touches `nf_reject_ipv4.c` and `nf_reject_ipv6.c`. These are built when `NF_REJECT_IPV4` and `NF_REJECT_IPV6` are explicitly enabled, and these, in turn, are selected by the `NFT_REJECT_*` options and also `IP_NF_TARGET_REJECT` and `IP6_NF_TARGET_REJECT` . This means that enabling `NFT_REJECT_IPV4` and `NFT_REJECT_IPV6` is sufficient for this functionality. That's good, keeps things cleaner. Now, focusing on connection tracking, we have `NF_CONNTRACK` and `NF_CONNCOUNT` with us. `NFT_CONNLIMIT` selects `NF_CONNCOUNT`, making that a logical dependency. Finally, let's consider the "forward path" functions. `dev_fill_forward_path` is in `net/core/dev.c`, so it's always included. However, `nft_dev_forward_path` is in `nf_flow_table_path.c`. Need to quickly review when `nf_flow_table_path.c` gets built.
32/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "nf_flow_table_path", "PathPrefix": "net/netfilter/Makefile" } Results: { "Output": "net/netfilter/Makefile=143=nf_flow_table-objs\t\t:= nf_flow_table_core.o nf_flow_table_ip.o \\\nnet/netfilter/Makefile:144:\t\t\t\t nf_flow_table_path.o \\\nnet/netfilter/Makefile-145-\t\t\t\t nf_flow_table_offload.o nf_flow_table_xdp.o\n" }
33/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 29361 output: 28 thoughts: 69 Thoughts: Here's my thought process, as it stands: Diving into the Flow Table Implementation Okay, so I'm looking at something within `nf_flow_table`. Given my background, I understand this is built using `NF_FLOW_TABLE`, which helps me understand the base structure. Now, I want to trace a particular function or path. I'll need to check how the forwarding path is built. I'll want to check `ipip_fill_forward_path`. I recall that one being related to encapsulation. I know that lives in `net/ipv4/ipip.c`. The next question is when is that built? I want to understand the build order and dependencies.
34/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "ipip", "PathPrefix": "net/ipv4/Makefile" } Results: { "Output": "net/ipv4/Makefile=24=obj-$(CONFIG_IP_MROUTE_COMMON) += ipmr_base.o\nnet/ipv4/Makefile:25:obj-$(CONFIG_NET_IPIP) += ipip.o\nnet/ipv4/Makefile-26-gre-y := gre_demux.o\n" }
35/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 29697 output: 30 thoughts: 45 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: Considering IP Tunneling Configuration Alright, let's see, the system needs to support IP-in-IP tunnels, so enabling `NET_IPIP` is definitely the right move. That's the baseline. Now, I'm thinking about IPv6 tunneling. The specific function I need to consider is `ip6_tnl_fill_forward_path`, which, if I recall correctly, resides within `net/ipv6/ip6_tunnel.c`. I need to ensure that the tunnel forwarding path is correctly initialized and configured for IPv6 tunnels. This function is likely crucial for setting up the encapsulation and decapsulation logic, especially around header manipulation and route lookups. I need to make sure I understand the interaction of that function with the tunnel driver and the IPv6 stack. Given that it resides in the IPv6 tunnel code, it clearly plays a key role in making sure IPv6 traffic is correctly routed through these tunnels.
36/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "ip6_tunnel", "PathPrefix": "net/ipv6/Makefile" } Results: { "Output": "net/ipv6/Makefile=41=obj-$(CONFIG_IPV6_SIT) += sit.o\nnet/ipv6/Makefile:42:obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o\nnet/ipv6/Makefile-43-obj-$(CONFIG_IPV6_GRE) += ip6_gre.o\n" }
37/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 30086 output: 27 thoughts: 58 Thoughts: Okay, here's my interpretation of those thoughts, distilled into a first-person expert summary: Considering IPv6 Tunneling and Data Structure Alignment Alright, the initial thought is that `IPV6_TUNNEL` needs to be enabled. I need to make sure that's accounted for. Now, let's dig into the details. I need to look at how forward paths are handled, specifically the `dsa_user_fill_forward_path` function. That's probably the right place to start for this. I know it's located in `net/dsa/user.c`. The next question I have is, at what point is `net/dsa/user.c` even built into the kernel? This question needs answering to ensure that whatever is required is also being compiled when it needs to be.
38/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "user", "PathPrefix": "net/dsa/Makefile" } Results: { "Output": "net/dsa/Makefile=10=dsa_core-y += \\\n--\nnet/dsa/Makefile-19-\ttrace.o \\\nnet/dsa/Makefile:20:\tuser.o\nnet/dsa/Makefile-21-\n" }
39/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 30424 output: 34 thoughts: 321 Thoughts: My Assessment of the DSA Core Configuration Okay, so I'm looking at this from a `dsa_core` perspective, which is built on `NET_DSA`. The core here is what matters; those hardware-specific functions, `airoha_ppe_get_wdma_info` and `mtk_flow_get_wdma_info`, found in `airoha_ppe.c` and `mtk_ppe_offload.c` respectively, are probably irrelevant in a QEMU environment, and it is the core that matters. I can ignore enabling those specific drivers because the heart of it is the core changes. Therefore, the relevant configuration options I need to consider are: `NF_TABLES`, `NF_FLOW_TABLE`, `NFT_FLOW_OFFLOAD`, `NFT_REJECT_IPV4`, `NFT_REJECT_IPV6`, `NFT_REJECT_INET`, `NFT_XFRM`, `NFT_CONNLIMIT`, `NF_CONNTRACK`, `NET_IPIP`, `IPV6_TUNNEL`, and `NET_DSA`. Just to be absolutely certain, I need to check the dependencies. `NFT_FLOW_OFFLOAD` relies on `NF_CONNTRACK` and `NF_FLOW_TABLE`, so I'll need to make sure those are properly configured too. And I see that `NFT_REJECT_INET` depends on `NF_TABLES_INET` as well, so that needs to be considered.
40/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "config NF_TABLES_INET", "PathPrefix": "net/netfilter/Kconfig" } Results: { "Output": "net/netfilter/Kconfig=471=if NF_TABLES\nnet/netfilter/Kconfig:472:config NF_TABLES_INET\nnet/netfilter/Kconfig-473-\tdepends on IPV6\n" }
41/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31169 output: 33 thoughts: 54 Thoughts: Okay, here's my take on those thoughts, framed as my own mental processing: Checking Dependencies for Network Functionality Right, so we're starting with the assumption that `NF_TABLES_INET` needs to be enabled. Let's make sure that's understood, and we'll keep that as our base. Now, let's just do a quick sanity check to ensure that `NFT_XFRM` doesn't have any hidden dependencies or interdependencies we need to be aware of. First, it requires `NF_TABLES` itself, which makes sense. We know that `NF_TABLES` has `NF_TABLES_INET` as a component, so we're good there. What about `XFRM`? Let's quickly verify that `XFRM` doesn't have any additional requirements that we should be considering.
42/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "config NFT_XFRM", "PathPrefix": "net/netfilter/Kconfig" } Results: { "Output": "net/netfilter/Kconfig=608=config NFT_FIB_INET\n--\nnet/netfilter/Kconfig-617-\nnet/netfilter/Kconfig:618:config NFT_XFRM\nnet/netfilter/Kconfig-619-\ttristate \"Netfilter nf_tables xfrm/IPSec security association matching\"\n" }
43/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31543 output: 38 thoughts: 78 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, as if they were my own mental process: Dependency Deep Dive: NFT_REJECT_IPV4 Right, so this code section seems pretty straightforward at first glance. It's tucked inside an `if NF_TABLES` block, so clearly, that's the primary, and as far as I can tell, the only explicit dependency. But then, it dawns on me, `XFRM` is such a fundamental networking component; it's practically always compiled in. It would be a silly oversight to miss if `NFT_REJECT_IPV4` relies on it. Just to be absolutely certain, I need to dig a little deeper. Let me quickly cross-reference `NFT_REJECT_IPV4`'s config options. Ah, there it is. Confirmed. It directly depends on `NF_TABLES_IPV4`. That's not entirely unexpected, given the context.
44/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "config NF_TABLES_IPV4", "PathPrefix": "net/ipv4/netfilter/Kconfig" } Results: { "Output": "net/ipv4/netfilter/Kconfig=33=if NF_TABLES\nnet/ipv4/netfilter/Kconfig-34-\nnet/ipv4/netfilter/Kconfig:35:config NF_TABLES_IPV4\nnet/ipv4/netfilter/Kconfig-36-\tbool \"IPv4 nf_tables support\"\n" }
45/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 31967 output: 38 thoughts: 35 Thoughts: Here's my take on the kernel module configuration, focusing on the essential `nftables` components: My Kernel Module Configuration Considerations Okay, so I'm thinking about getting this system up to snuff with `nftables`. To make sure it's functioning as expected, I absolutely need to enable `NF_TABLES_IPV4`. That's a no-brainer, fundamental for handling IPv4 traffic with nftables. And if I want to get the IPv6 rejects done in `nftables`, I also need `NF_TABLES_IPV6`. Makes perfect sense. I need to configure both to get everything working as expected.
46/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "config NF_TABLES_IPV6", "PathPrefix": "net/ipv6/netfilter/Kconfig" } Results: { "Output": "net/ipv6/netfilter/Kconfig=29=if NF_TABLES\nnet/ipv6/netfilter/Kconfig-30-\nnet/ipv6/netfilter/Kconfig:31:config NF_TABLES_IPV6\nnet/ipv6/netfilter/Kconfig-32-\tbool \"IPv6 nf_tables support\"\n" }
47/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32274 output: 31 thoughts: 159 Thoughts: My Configuration Checklist Okay, let's get down to brass tacks. I need to review a set of kernel configurations for this networking task. First, I'm thinking about the fundamental Netfilter and nftables components, specifically `NF_TABLES`, `NF_TABLES_IPV4`, `NF_TABLES_IPV6`, and the combined `NF_TABLES_INET`. These are, of course, absolutely crucial to almost any modern network setup using nftables. Then I need to confirm the flow offload configurations; `NF_FLOW_TABLE` and `NFT_FLOW_OFFLOAD` and the reject configurations; `NFT_REJECT_IPV4`, `NFT_REJECT_IPV6`, and `NFT_REJECT_INET`. I'll also keep in mind related options like `NFT_XFRM` for transport layer security and encapsulation, and the `NFT_CONNLIMIT` module for connection limiting, should I need them. We can't forget the connection tracking piece, `NF_CONNTRACK`. Then, there's the more general networking options like `NET_IPIP` and `IPV6_TUNNEL` to consider. Now, a bit of a sanity check is needed on this last one – `NET_DSA`. I'm going to quickly check the dependencies of this configuration. I'm pretty sure it depends on a few things. Best to ensure all the prerequisites are met.
48/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "config NET_DSA", "PathPrefix": "net/dsa/Kconfig" } Results: { "Output": "net/dsa/Kconfig-2-\nnet/dsa/Kconfig:3:menuconfig NET_DSA\nnet/dsa/Kconfig-4-\ttristate \"Distributed Switch Architecture\"\n--\nnet/dsa/Kconfig=17=if NET_DSA\n--\nnet/dsa/Kconfig-20-\nnet/dsa/Kconfig:21:config NET_DSA_TAG_NONE\nnet/dsa/Kconfig-22-\ttristate \"No-op tag driver\"\n--\nnet/dsa/Kconfig-26-\nnet/dsa/Kconfig:27:config NET_DSA_TAG_AR9331\nnet/dsa/Kconfig-28-\ttristate \"Tag driver for Atheros AR9331 SoC with built-in switch\"\n--\nnet/dsa/Kconfig-32-\nnet/dsa/Kconfig:33:config NET_DSA_TAG_BRCM_COMMON\nnet/dsa/Kconfig-34-\ttristate\n--\nnet/dsa/Kconfig-36-\nnet/dsa/Kconfig:37:config NET_DSA_TAG_BRCM\nnet/dsa/Kconfig-38-\ttristate \"Tag driver for Broadcom switches using in-frame headers\"\n--\nnet/dsa/Kconfig-43-\nnet/dsa/Kconfig:44:config NET_DSA_TAG_BRCM_LEGACY\nnet/dsa/Kconfig-45-\ttristate \"Tag driver for BCM63xx legacy switches using in-frame headers\"\n--\nnet/dsa/Kconfig-53-\nnet/dsa/Kconfig:54:config NET_DSA_TAG_BRCM_LEGACY_FCS\nnet/dsa/Kconfig-55-\ttristate \"Tag driver for BCM53xx legacy switches using in-frame headers\"\n--\nnet/dsa/Kconfig-63-\nnet/dsa/Kconfig:64:config NET_DSA_TAG_BRCM_PREPEND\nnet/dsa/Kconfig-65-\ttristate \"Tag driver for Broadcom switches using prepended headers\"\n--\nnet/dsa/Kconfig-71-\nnet/dsa/Kconfig:72:config NET_DSA_TAG_HELLCREEK\nnet/dsa/Kconfig-73-\ttristate \"Tag driver for Hirschmann Hellcreek TSN switches\"\n--\nnet/dsa/Kconfig-77-\nnet/dsa/Kconfig:78:config NET_DSA_TAG_GSWIP\nnet/dsa/Kconfig-79-\ttristate \"Tag driver for Lantiq / Intel GSWIP switches\"\n--\nnet/dsa/Kconfig-83-\nnet/dsa/Kconfig:84:config NET_DSA_TAG_DSA_COMMON\nnet/dsa/Kconfig-85-\ttristate\nnet/dsa/Kconfig-86-\nnet/dsa/Kconfig:87:config NET_DSA_TAG_DSA\nnet/dsa/Kconfig-88-\ttristate \"Tag driver for Marvell switches using DSA headers\"\n--\nnet/dsa/Kconfig-93-\nnet/dsa/Kconfig:94:config NET_DSA_TAG_EDSA\nnet/dsa/Kconfig-95-\ttristate \"Tag driver for Marvell switches using EtherType DSA headers\"\n--\nnet/dsa/Kconfig-100-\nnet/dsa/Kconfig:101:config NET_DSA_TAG_MTK\nnet/dsa/Kconfig-102-\ttristate \"Tag driver for Mediatek switches\"\n--\nnet/dsa/Kconfig-106-\nnet/dsa/Kconfig:107:config NET_DSA_TAG_MXL_862XX\nnet/dsa/Kconfig-108-\ttristate \"Tag driver for MaxLinear MxL862xx switches\"\n--\nnet/dsa/Kconfig-113-\nnet/dsa/Kconfig:114:config NET_DSA_TAG_MXL_GSW1XX\nnet/dsa/Kconfig-115-\ttristate \"Tag driver for MaxLinear GSW1xx switches\"\n--\nnet/dsa/Kconfig-121-\nnet/dsa/Kconfig:122:config NET_DSA_TAG_KSZ\nnet/dsa/Kconfig-123-\ttristate \"Tag driver for Microchip 8795/937x/9477/9893 families of switches\"\n--\nnet/dsa/Kconfig-127-\nnet/dsa/Kconfig:128:config NET_DSA_TAG_NETC\nnet/dsa/Kconfig-129-\ttristate \"Tag driver for NXP NETC switches\"\n--\nnet/dsa/Kconfig-137-\nnet/dsa/Kconfig:138:config NET_DSA_TAG_OCELOT\nnet/dsa/Kconfig-139-\ttristate \"Tag driver for Ocelot family of switches, using NPI port\"\n--\nnet/dsa/Kconfig-148-\nnet/dsa/Kconfig:149:config NET_DSA_TAG_OCELOT_8021Q\nnet/dsa/Kconfig-150-\ttristate \"Tag driver for Ocelot family of switches, using VLAN\"\n--\nnet/dsa/Kconfig-158-\nnet/dsa/Kconfig:159:config NET_DSA_TAG_QCA\nnet/dsa/Kconfig-160-\ttristate \"Tag driver for Qualcomm Atheros QCA8K switches\"\n--\nnet/dsa/Kconfig-164-\nnet/dsa/Kconfig:165:config NET_DSA_TAG_RTL4_A\nnet/dsa/Kconfig-166-\ttristate \"Tag driver for Realtek 4 byte protocol A tags\"\n--\nnet/dsa/Kconfig-171-\nnet/dsa/Kconfig:172:config NET_DSA_TAG_RTL8_4\nnet/dsa/Kconfig-173-\ttristate \"Tag driver for Realtek 8 byte protocol 4 tags\"\n--\nnet/dsa/Kconfig-177-\nnet/dsa/Kconfig:178:config NET_DSA_TAG_RZN1_A5PSW\nnet/dsa/Kconfig-179-\ttristate \"Tag driver for Renesas RZ/N1 A5PSW switch\"\n--\nnet/dsa/Kconfig-184-\nnet/dsa/Kconfig:185:config NET_DSA_TAG_LAN9303\nnet/dsa/Kconfig-186-\ttristate \"Tag driver for SMSC/Microchip LAN9303 family of switches\"\n--\nnet/dsa/Kconfig-190-\nnet/dsa/Kconfig:191:config NET_DSA_TAG_SJA1105\nnet/dsa/Kconfig-192-\ttristate \"Tag driver for NXP SJA1105 switches\"\n--\nnet/dsa/Kconfig-199-\nnet/dsa/Kconfig:200:config NET_DSA_TAG_TRAILER\nnet/dsa/Kconfig-201-\ttristate \"Tag driver for switches using a trailer tag\"\n--\nnet/dsa/Kconfig-205-\nnet/dsa/Kconfig:206:config NET_DSA_TAG_VSC73XX_8021Q\nnet/dsa/Kconfig-207-\ttristate \"Tag driver for Microchip/Vitesse VSC73xx family of switches, using VLAN\"\n--\nnet/dsa/Kconfig-211-\nnet/dsa/Kconfig:212:config NET_DSA_TAG_XRS700X\nnet/dsa/Kconfig-213-\ttristate \"Tag driver for XRS700x switches\"\n--\nnet/dsa/Kconfig-217-\nnet/dsa/Kconfig:218:config NET_DSA_TAG_YT921X\nnet/dsa/Kconfig-219-\ttristate \"Tag driver for Motorcomm YT921x switches\"\n" }
49/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 34828 output: 44 thoughts: 152 Thoughts: My Initial Assessment and a Focused Review Okay, after thinking about this, I've concluded that `NET_DSA` is sufficient for now. I don't see any immediate need to go further down that path. Let's quickly refresh my memory regarding those focus symbols: `nft_flow_offload_eval`, `nft_reject_ipv4_eval`, `nft_reject_ipv6_eval`, `nft_reject_inet_eval`, `nft_meta_get_eval`, `nft_rt_get_eval`, `nft_xfrm_get_eval`, `nft_connlimit_eval`, and `nf_conntrack_tcp_packet`. These are the key areas that need to be considered. Hold on a minute, I'm just recalling that `nft_reject_ipv4_eval` is, in fact, statically defined. Let me just open up `nft_reject_ipv4.c` and make sure my instincts are correct.
50/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "nft_reject_ipv4_eval", "PathPrefix": "net/ipv4/netfilter/nft_reject_ipv4.c" } Results: { "Output": "net/ipv4/netfilter/nft_reject_ipv4.c-18-\nnet/ipv4/netfilter/nft_reject_ipv4.c:19:static void nft_reject_ipv4_eval(const struct nft_expr expr,\nnet/ipv4/netfilter/nft_reject_ipv4.c-20-\t\t\t\t struct nft_regs regs,\n--\nnet/ipv4/netfilter/nft_reject_ipv4.c=41=static const struct nft_expr_ops nft_reject_ipv4_ops = {\n--\nnet/ipv4/netfilter/nft_reject_ipv4.c-43-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_reject)),\nnet/ipv4/netfilter/nft_reject_ipv4.c:44:\t.eval\t\t= nft_reject_ipv4_eval,\nnet/ipv4/netfilter/nft_reject_ipv4.c-45-\t.init\t\t= nft_reject_init,\n" }
51/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 35488 output: 37 thoughts: 293 Thoughts: Analyzing Potential Fuzzing Targets Okay, so I'm looking at these network functions. The initial thought was, even if something's static, syzkaller might be able to find it if it isn't inlined, so it's potentially targetable. But let's refine this analysis. Aha! `nf_send_reset` and `nf_send_reset6` are both exported and non-static. And similarly, `nf_send_unreach` and `nf_send_unreach6` are also exported. So that's good! That makes them better candidates, and worth focusing on. Let's make a note of those four as good starting points for fuzzing. Now, what about the `nft` subsystem? Let's check `nft_meta_get_eval`... yep, exported. That looks promising. And `nft_rt_get_eval` is also exported. Okay. What about `nft_xfrm_get_eval`? Ah, it's static, damn. But, hold on... `nft_xfrm_get_eval_out` is also static. Let's backtrack, it's static but is there a non-static entry point? I see `nft_xfrm_get_ops` is registered, so maybe that's a better starting point. And finally, let's look at `nft_connlimit_eval`, that one is static. But, wait, `nf_conncount_add` is exported. Okay, good. So the picture's becoming clearer.
52/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "nf_conncount_add", "PathPrefix": "net/netfilter/nf_conncount.c" } Results: { "Output": "net/netfilter/nf_conncount.c=130=static bool get_ct_or_tuple_from_skb(struct net net,\n--\nnet/netfilter/nf_conncount.c-168-\nnet/netfilter/nf_conncount.c:169:static int __nf_conncount_add(struct net net,\nnet/netfilter/nf_conncount.c-170-\t\t\t const struct sk_buff skb,\n--\nnet/netfilter/nf_conncount.c-277-\nnet/netfilter/nf_conncount.c:278:int nf_conncount_add_skb(struct net net,\nnet/netfilter/nf_conncount.c-279-\t\t\t const struct sk_buff skb,\n--\nnet/netfilter/nf_conncount.c-286-\tspin_lock_bh(\u0026list-\u003elist_lock);\nnet/netfilter/nf_conncount.c:287:\tret = __nf_conncount_add(net, skb, l3num, list);\nnet/netfilter/nf_conncount.c-288-\tspin_unlock_bh(\u0026list-\u003elist_lock);\n--\nnet/netfilter/nf_conncount.c-291-}\nnet/netfilter/nf_conncount.c:292:EXPORT_SYMBOL_GPL(nf_conncount_add_skb);\nnet/netfilter/nf_conncount.c-293-\n--\nnet/netfilter/nf_conncount.c=403=insert_tree(struct net net,\n--\nnet/netfilter/nf_conncount.c-437-\nnet/netfilter/nf_conncount.c:438:\t\t\tret = nf_conncount_add_skb(net, skb, l3num, \u0026rbconn-\u003elist);\nnet/netfilter/nf_conncount.c-439-\t\t\tif (ret \u0026\u0026 ret != -EEXIST)\n--\nnet/netfilter/nf_conncount.c=533=count_tree(struct net net,\n--\nnet/netfilter/nf_conncount.c-582-\t/ same source network -\u003e be counted! */\nnet/netfilter/nf_conncount.c:583:\tret = __nf_conncount_add(net, skb, l3num, \u0026rbconn-\u003elist);\nnet/netfilter/nf_conncount.c-584-\tspin_unlock_bh(\u0026rbconn-\u003elist.list_lock);\n" }
53/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 36797 output: 37 thoughts: 26 Thoughts: Here's a summary of my thoughts, focusing on the exported symbols: Reflecting on Kernel Module Exports Okay, so I see that `nf_conncount_add_skb` and `nf_conncount_count` are both being exported. That immediately tells me a few things, based on my understanding of kernel module design and netfilter. First, these symbols are clearly intended to be used by other modules. They're not internal functions; they're meant for interaction. The naming suggests they're related to connection tracking or connection counting – likely part of some sort of network firewall or monitoring functionality. The "nf" prefix is a dead giveaway for netfilter. I'm assuming `nf_conncount_add_skb` likely handles adding or updating information about a network packet (SKB) related to a particular connection. Maybe this involves incrementing counters or storing connection details. Given my experience with netfilter hooks, it could be called within an NF hook function. `nf_conncount_count`, on the other hand, likely provides a way to retrieve or expose connection count data. Could be for reporting purposes or to dynamically adjust behavior based on connection load. It could be used to gather statistics on a connection, perhaps to track number of packets and bytes. The fact that these are exported implies that there is a well-defined interface for interacting with this "conncount" functionality. Now, my next step would be to review the associated header files and source code to truly understand their specific implementation details and, critically, their intended usage. I need to understand the data structures they operate on and the possible locking and synchronization concerns involved. Are these functions thread-safe? Do they utilize any internal mutexes? This export suggests that whoever developed this module was thinking about modularity. They recognized that other parts of the kernel or even other modules might need to access and utilize this connection counting functionality. This is a good thing – good code design promotes reuse and collaboration. I need to understand how they're designed for modularity. So, in summary: I'm seeing a connection count module or feature. I need to research exactly how those modules are designed to integrate with the netfilter framework.
54/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "nf_conncount_count", "PathPrefix": "net/netfilter/nf_conncount.c" } Results: { "Output": "net/netfilter/nf_conncount.c=595=static void tree_gc_worker(struct work_struct work)\n--\nnet/netfilter/nf_conncount.c-665- /\nnet/netfilter/nf_conncount.c:666:unsigned int nf_conncount_count_skb(struct net net,\nnet/netfilter/nf_conncount.c-667-\t\t\t\t const struct sk_buff skb,\n--\nnet/netfilter/nf_conncount.c-674-}\nnet/netfilter/nf_conncount.c:675:EXPORT_SYMBOL_GPL(nf_conncount_count_skb);\nnet/netfilter/nf_conncount.c-676-\n" }
55/2	2026/08/02 00:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 37522 output: 27 thoughts: 538 Thoughts: My Current Assessment of Key Netfilter Symbols Okay, so I've been thinking about the critical symbols to focus on within the Netfilter framework. I started by zeroing in on `nf_conncount_add_skb` and `nf_conncount_count_skb` as good initial candidates. Now, I've expanded the scope a bit. I'm also considering `nft_flow_route` because it's exported and looks important. And, similarly, `dev_fill_forward_path` and `dev_fill_forward_path_release` have caught my attention for being exported. Therefore, my current working list of focus symbols includes: * `nft_flow_route` * `dev_fill_forward_path` * `dev_fill_forward_path_release` * `nf_send_reset` * `nf_send_reset6` * `nf_send_unreach` * `nf_send_unreach6` * `nft_meta_get_eval` * `nft_rt_get_eval` * `nf_conncount_add_skb` * `nf_conncount_count_skb` * `nf_conntrack_tcp_packet` I double-checked each one to be sure they were exported, just to confirm my current understanding. So, `nft_flow_route` and the `dev_fill_forward_path` functions are all exported. Also the `nf_send_` functions are exported, along with the `nft__get_eval` functions, and of course the `nf_conncount_` functions. I did run into a small anomaly with `nf_conntrack_tcp_packet`. While it isn't exported, it's non-static and defined within `net/netfilter/nf_conntrack_proto_tcp.c`, which makes it a potential target for further investigation, despite being non-exported. Wait... something still seems a little off. I need to be sure that `nf_send_unreach` is exported.
56/2	2026/08/02 00:16	tool	grepper	0m Args: { "Expression": "EXPORT_SYMBOL_GPL\\(nf_send_unreach" } Results: { "Output": "net/ipv4/netfilter/nf_reject_ipv4.c=348=void nf_send_unreach(struct sk_buff skb_in, int code, int hook)\n--\nnet/ipv4/netfilter/nf_reject_ipv4.c-368-}\nnet/ipv4/netfilter/nf_reject_ipv4.c:369:EXPORT_SYMBOL_GPL(nf_send_unreach);\nnet/ipv4/netfilter/nf_reject_ipv4.c-370-\n--\nnet/ipv6/netfilter/nf_reject_ipv6.c=438=void nf_send_unreach6(struct net net, struct sk_buff *skb_in,\n--\nnet/ipv6/netfilter/nf_reject_ipv6.c-451-}\nnet/ipv6/netfilter/nf_reject_ipv6.c:452:EXPORT_SYMBOL_GPL(nf_send_unreach6);\nnet/ipv6/netfilter/nf_reject_ipv6.c-453-\n" }
57/2	2026/08/02 00:17	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 38834 output: 28 thoughts: 20 Thoughts: Okay, here's my summary, tailored for an expert audience, as if I'm thinking these things myself: Exporting NFTs and Evaluation Retrieval Alright, so the topic at hand is the export process, and, yes, I'm confirming that the relevant items are indeed being exported. Now, my next step is to drill down into the nitty-gritty of the implementation. I'll need to thoroughly examine the `nft_rt_get_eval` function. This is likely where the core logic for retrieving the evaluation results resides, and that's where I need to focus my attention to understand exactly how this works in the larger context of the export process. I need to understand how the values are acquired and how that acquisition works in relation to how it is exported.
58/2	2026/08/02 00:17	tool	grepper	0m Error: no matches Args: { "Expression": "EXPORT_SYMBOL_GPL\\(nft_rt_get_eval" } Results: { "error": "no matches" }
59/2	2026/08/02 00:17	llm	patch-evaluator	5m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 39061 output: 37 thoughts: 15 Thoughts: Here's my attempt at summarizing that thought process, tailored for an expert audience: Hmm, `nft_rt_get_eval` Is Missing? Okay, hold on a second. I was just digging into the kernel's netfilter code, specifically around the runtime evaluation framework. I was expecting `nft_rt_get_eval` to be available. I need it for X, and I thought that was a core part of the infrastructure. But... it's not exported. That's immediately problematic. Now I have to figure out why. Is it a compile-time option I missed? Is it hidden behind some macro that needs to be enabled? Or perhaps it's a completely different function with a similar name, something internal? I need to double-check my assumptions and the broader context. This wasn't anticipated, and it throws a bit of a wrench into my current plan. Time to start digging through the headers again, and maybe cross-reference the commit logs.
60/2	2026/08/02 00:22	tool	grepper	0m Args: { "Expression": "nft_rt_get_eval", "PathPrefix": "net/netfilter/nft_rt.c" } Results: { "Output": "net/netfilter/nft_rt.c=22=static u16 get_tcpmss(const struct nft_pktinfo pkt, const struct dst_entry skbdst)\n--\nnet/netfilter/nft_rt.c-53-\nnet/netfilter/nft_rt.c:54:void nft_rt_get_eval(const struct nft_expr expr,\nnet/netfilter/nft_rt.c-55-\t\t struct nft_regs regs,\n--\nnet/netfilter/nft_rt.c=193=static const struct nft_expr_ops nft_rt_get_ops = {\n--\nnet/netfilter/nft_rt.c-195-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_rt)),\nnet/netfilter/nft_rt.c:196:\t.eval\t\t= nft_rt_get_eval,\nnet/netfilter/nft_rt.c-197-\t.init\t\t= nft_rt_get_init,\n" }
61/2	2026/08/02 00:22	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 39580 output: 28 thoughts: 40 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Analyzing `nft_meta_get_eval`'s Visibility for Fuzzing Alright, so the initial assessment is that the target function isn't static, but it also isn't explicitly exported. That's actually a relief. While static functions can sometimes present a challenge in fuzzing scenarios, the fact that it's not static means it's accessible. Syzkaller, in its current state, can absolutely handle non-static functions, so no need for workarounds there. The assumption is that the symbol table contains the function. Now, let's switch gears and focus specifically on `nft_meta_get_eval`. I need to understand its behavior and potential for exploitation. This is where the investigation really begins.
62/2	2026/08/02 00:22	tool	grepper	0m Args: { "Expression": "EXPORT_SYMBOL_GPL\\(nft_meta_get_eval" } Results: { "Output": "net/netfilter/nft_meta.c=364=void nft_meta_get_eval(const struct nft_expr *expr,\n--\nnet/netfilter/nft_meta.c-472-}\nnet/netfilter/nft_meta.c:473:EXPORT_SYMBOL_GPL(nft_meta_get_eval);\nnet/netfilter/nft_meta.c-474-\n" }
63/2	2026/08/02 00:22	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 39934 output: 39 thoughts: 21 Thoughts: Okay, here's my summary, tailored for an expert audience, as if it were my thought process: Verifying the Export Operation Right, so we've established that the data is exported. That's the baseline, the assumption we're starting from. Now, let's drill down and see how exactly that's working, what's behind the scenes. My next step is to examine the function call: `nft_xfrm_get_eval`. I need to understand how the netfilter framework handles the transformation retrieval and evaluation in this particular context. I need to know the specific interactions happening here.
64/2	2026/08/02 00:22	tool	grepper	0m Args: { "Expression": "nft_xfrm_get_eval", "PathPrefix": "net/netfilter/nft_xfrm.c" } Results: { "Output": "net/netfilter/nft_xfrm.c=120=static void nft_xfrm_state_get_key(const struct nft_xfrm priv,\n--\nnet/netfilter/nft_xfrm.c-160-\nnet/netfilter/nft_xfrm.c:161:static void nft_xfrm_get_eval_in(const struct nft_xfrm priv,\nnet/netfilter/nft_xfrm.c-162-\t\t\t\t struct nft_regs regs,\n--\nnet/netfilter/nft_xfrm.c-176-\nnet/netfilter/nft_xfrm.c:177:static void nft_xfrm_get_eval_out(const struct nft_xfrm priv,\nnet/netfilter/nft_xfrm.c-178-\t\t\t\t struct nft_regs regs,\n--\nnet/netfilter/nft_xfrm.c-201-\nnet/netfilter/nft_xfrm.c:202:static void nft_xfrm_get_eval(const struct nft_expr expr,\nnet/netfilter/nft_xfrm.c-203-\t\t\t struct nft_regs *regs,\n--\nnet/netfilter/nft_xfrm.c-209-\tcase XFRM_POLICY_IN:\nnet/netfilter/nft_xfrm.c:210:\t\tnft_xfrm_get_eval_in(priv, regs, pkt);\nnet/netfilter/nft_xfrm.c-211-\t\tbreak;\nnet/netfilter/nft_xfrm.c-212-\tcase XFRM_POLICY_OUT:\nnet/netfilter/nft_xfrm.c:213:\t\tnft_xfrm_get_eval_out(priv, regs, pkt);\nnet/netfilter/nft_xfrm.c-214-\t\tbreak;\n--\nnet/netfilter/nft_xfrm.c=270=static const struct nft_expr_ops nft_xfrm_get_ops = {\n--\nnet/netfilter/nft_xfrm.c-272-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_xfrm)),\nnet/netfilter/nft_xfrm.c:273:\t.eval\t\t= nft_xfrm_get_eval,\nnet/netfilter/nft_xfrm.c-274-\t.init\t\t= nft_xfrm_get_init,\n" }
65/2	2026/08/02 00:22	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 40731 output: 37 thoughts: 57 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, as if they were my own: Analyzing a Potential Syzkaller Target Right, this looks pretty static. I see it, registered in `nft_xfrm_get_ops`, and that piques my interest. The fact that it's not dynamically generated increases the chance that syzkaller, the fuzzer, could potentially target it directly. If it's not inlined, then it's a good candidate to include and see what happens. I'm thinking syzkaller might be able to find a way in. Now, let's switch gears and investigate `nft_connlimit_eval`. I'll cross-reference the `nft_xfrm_get_ops` to determine the relationship, if any.
66/2	2026/08/02 00:22	tool	grepper	0m Args: { "Expression": "nft_connlimit_eval", "PathPrefix": "net/netfilter/nft_connlimit.c" } Results: { "Output": "net/netfilter/nft_connlimit.c=176=static struct nft_object_type nft_connlimit_obj_type __read_mostly = {\n--\nnet/netfilter/nft_connlimit.c-183-\nnet/netfilter/nft_connlimit.c:184:static void nft_connlimit_eval(const struct nft_expr expr,\nnet/netfilter/nft_connlimit.c-185-\t\t\t struct nft_regs regs,\n--\nnet/netfilter/nft_connlimit.c=251=static const struct nft_expr_ops nft_connlimit_ops = {\n--\nnet/netfilter/nft_connlimit.c-253-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_connlimit)),\nnet/netfilter/nft_connlimit.c:254:\t.eval\t\t= nft_connlimit_eval,\nnet/netfilter/nft_connlimit.c-255-\t.init\t\t= nft_connlimit_init,\n" }
67/2	2026/08/02 00:22	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 41263 output: 26 thoughts: 18 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: Navigating the Static Reality: Registered and Ready Alright, so the initial assessment is that something's static. Not dynamic, not changing – which could be a good or bad thing, depending on the context. But also, it's registered. That's the critical bit. Registered implies it's known, accounted for, within the system. We're not dealing with an unknown variable here, which is a significant relief. Now, what's registered, and what does this mean for our flow? Time to dig into `nft_flow_route`. Let's see how that registered status interacts with the routing logic. This could be where the rubber meets the road. I'm keen to see if this static but registered aspect influences the flow path, or is simply a data point. Let's see.
68/2	2026/08/02 00:22	tool	grepper	0m Args: { "Expression": "EXPORT_SYMBOL_GPL\\(nft_flow_route" } Results: { "Output": "net/netfilter/nf_flow_table_path.c=260=int nft_flow_route(const struct nft_pktinfo pkt, const struct nf_conn ct,\n--\nnet/netfilter/nf_flow_table_path.c-316-}\nnet/netfilter/nf_flow_table_path.c:317:EXPORT_SYMBOL_GPL(nft_flow_route);\n" }
69/2	2026/08/02 00:22	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 41616 output: 385 thoughts: 578 Thoughts: My Analysis of the Proposed Patch Series Okay, so this patch series has been exported, good. My initial scan tells me we're dealing with core networking and netfilter fixes – specifically, memory leak resolution and refined handling of `dst_entry` within `sk_buff` and `net_device_path`. I've noted the critical function symbols targeted for review: `nft_flow_route`, `dev_fill_forward_path`, `dev_fill_forward_path_release`, `nf_send_reset`, and so on, covering the usual suspects in Netfilter's interaction with the packet path, including flow offload, TCP state management, and reject/unreachable handling. The patch's introduction of `dev_fill_forward_path_release` for correct `dst` release is a definite sign that this is important, as are the updates to `skb_valid_dst` checks across the modules. These are changes that touch reachable kernel code paths. This demands rigorous fuzzing as part of our analysis plan. Now, let's verify my configuration assumptions. I see that we have `NF_TABLES`, `NF_TABLES_IPV4`, `NF_TABLES_IPV6`, `NF_TABLES_INET`, `NF_FLOW_TABLE`, `NFT_FLOW_OFFLOAD`, `NFT_REJECT_IPV4`, `NFT_REJECT_IPV6`, `NFT_REJECT_INET`, `NFT_XFRM`, `NFT_CONNLIMIT`, `NF_CONNTRACK`, `NET_IPIP`, `IPV6_TUNNEL`, and `NET_DSA`. I need to ensure these are correct. First, is `NF_CONNCOUNT` actually needed, or is it pulled in via a dependency? Ah, it seems `NFT_CONNLIMIT` selects `NF_CONNCOUNT`, so just having `NFT_CONNLIMIT` is sufficient. That simplifies the configuration. Next, I'll confirm the specific configuration options I see. `NET_IPIP` builds `net/ipv4/ipip.c`, so that's correct. Similarly, `IPV6_TUNNEL` builds `net/ipv6/ip6_tunnel.c`, and `NET_DSA` builds `net/dsa/user.c`. Excellent, my assumptions are validated. I'm satisfied with this analysis. I will now call `set-results`.
70/2	2026/08/02 00:22	tool	set-results	0m Args: { "EnableConfigs": [ "NF_TABLES", "NF_TABLES_IPV4", "NF_TABLES_IPV6", "NF_TABLES_INET", "NF_FLOW_TABLE", "NFT_FLOW_OFFLOAD", "NFT_REJECT_IPV4", "NFT_REJECT_IPV6", "NFT_REJECT_INET", "NFT_XFRM", "NFT_CONNLIMIT", "NF_CONNTRACK", "NET_IPIP", "IPV6_TUNNEL", "NET_DSA" ], "FocusSymbols": [ "nft_flow_route", "dev_fill_forward_path", "dev_fill_forward_path_release", "nf_send_reset", "nf_send_reset6", "nf_send_unreach", "nf_send_unreach6", "nft_meta_get_eval", "nft_rt_get_eval", "nf_conncount_add_skb", "nf_conncount_count_skb", "nf_conntrack_tcp_packet" ], "Reasoning": "The patch series modifies the core networking and netfilter subsystems to fix memory leaks and improve handling of `dst_entry` in `sk_buff` and `net_device_path`. It introduces `dev_fill_forward_path_release` to properly release `dst` entries, updates `skb_valid_dst` checks in netfilter reject, meta, rt, and xfrm modules, and modifies conntrack TCP state handling. These are functional changes in reachable core kernel paths and should be fuzzed.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "NF_TABLES", "NF_TABLES_IPV4", "NF_TABLES_IPV6", "NF_TABLES_INET", "NF_FLOW_TABLE", "NFT_FLOW_OFFLOAD", "NFT_REJECT_IPV4", "NFT_REJECT_IPV6", "NFT_REJECT_INET", "NFT_XFRM", "NFT_CONNLIMIT", "NF_CONNTRACK", "NET_IPIP", "IPV6_TUNNEL", "NET_DSA" ], "FocusSymbols": [ "nft_flow_route", "dev_fill_forward_path", "dev_fill_forward_path_release", "nf_send_reset", "nf_send_reset6", "nf_send_unreach", "nf_send_unreach6", "nft_meta_get_eval", "nft_rt_get_eval", "nf_conncount_add_skb", "nf_conncount_count_skb", "nf_conntrack_tcp_packet" ], "Reasoning": "The patch series modifies the core networking and netfilter subsystems to fix memory leaks and improve handling of `dst_entry` in `sk_buff` and `net_device_path`. It introduces `dev_fill_forward_path_release` to properly release `dst` entries, updates `skb_valid_dst` checks in netfilter reject, meta, rt, and xfrm modules, and modifies conntrack TCP state handling. These are functional changes in reachable core kernel paths and should be fuzzed.", "WorthFuzzing": true }

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

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