| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/07/10 18:21 | flow | patch-triage |
1mArgs:null Results: {
"EnableConfigs": [
"IP_VS",
"IP_VS_IPV6",
"IP_VS_PROTO_TCP",
"IP_VS_PROTO_UDP"
],
"FocusSymbols": [
"ip_vs_checksum_common_check",
"ip_vs_in_icmp_v6",
"ip_vs_in_icmp",
"handle_response_icmp",
"tcp_csum_check",
"udp_csum_check"
],
"Reasoning": "The patch introduces a new common checksum validation function for IPVS and uses it across TCP, UDP, and ICMP protocols. It also adds checksum validation for incoming ICMPv6 packets. Fuzzing should focus on these checksum validation paths to ensure they correctly handle malformed packets.",
"WorthFuzzing": true
} |
| 1/1 | 2026/07/10 18:21 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 2d0e416dc5e500879e13b7e48891181152f0fa95\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Fri Jul 10 18:21:47 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/include/net/ip_vs.h b/include/net/ip_vs.h\nindex 417ff51f62fc8e..cd65dd3a4ad1f6 100644\n--- a/include/net/ip_vs.h\n+++ b/include/net/ip_vs.h\n@@ -2066,8 +2066,6 @@ void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,\n \t\t struct ip_vs_conn *cp, int dir);\n #endif\n \n-__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);\n-\n static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)\n {\n \t__be32 diff[2] = { ~old, new };\n@@ -2093,6 +2091,9 @@ static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)\n \treturn csum_partial(diff, sizeof(diff), oldsum);\n }\n \n+bool ip_vs_checksum_common_check(int af, struct sk_buff *skb, int proto,\n+\t\t\t\t int offset);\n+\n /* Forget current conntrack (unconfirmed) and attach notrack entry */\n static inline void ip_vs_notrack(struct sk_buff *skb)\n {\ndiff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c\nindex 35cbe821c25967..6cae4ea45d55ab 100644\n--- a/net/netfilter/ipvs/ip_vs_core.c\n+++ b/net/netfilter/ipvs/ip_vs_core.c\n@@ -867,11 +867,56 @@ static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs) { return 0; }\n \n #endif\n \n-__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)\n+static __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)\n {\n \treturn csum_fold(skb_checksum(skb, offset, skb-\u003elen - offset, 0));\n }\n \n+/**\n+ * ip_vs_checksum_common_check - validate checksum for TCP/UDP/ICMP\n+ * @af: AF_INET/AF_INET6\n+ * @skb: socket buffer\n+ * @proto: IPPROTO_xxx\n+ * @offset: offset of protocol header\n+ */\n+bool ip_vs_checksum_common_check(int af, struct sk_buff *skb, int proto,\n+\t\t\t\t int offset)\n+{\n+\t__wsum csum;\n+\n+\tif (skb_csum_unnecessary(skb))\n+\t\treturn true;\n+\tif (skb-\u003eip_summed == CHECKSUM_NONE) {\n+\t\tcsum = skb_checksum(skb, offset, skb-\u003elen - offset, 0);\n+\t} else if (skb-\u003eip_summed == CHECKSUM_COMPLETE) {\n+\t\t/* IPVS works at IP layer, so skb-\u003ecsum covers data from\n+\t\t * IP header, strip it up to the protocol header\n+\t\t */\n+\t\tcsum = csum_sub(skb-\u003ecsum, skb_checksum(skb, 0, offset, 0));\n+\t} else {\n+\t\t/* No need to checksum. */\n+\t\treturn true;\n+\t}\n+#ifdef CONFIG_IP_VS_IPV6\n+\tif (af == AF_INET6) {\n+\t\tif (csum_ipv6_magic(\u0026ipv6_hdr(skb)-\u003esaddr,\n+\t\t\t\t \u0026ipv6_hdr(skb)-\u003edaddr,\n+\t\t\t\t skb-\u003elen - offset, proto,\n+\t\t\t\t csum))\n+\t\t\treturn false;\n+\t} else\n+#endif\n+\t\tif (proto == IPPROTO_ICMP)\n+\t\t\treturn !csum_fold(csum);\n+\t\telse if (csum_tcpudp_magic(ip_hdr(skb)-\u003esaddr,\n+\t\t\t\t\t ip_hdr(skb)-\u003edaddr,\n+\t\t\t\t\t skb-\u003elen - offset, proto,\n+\t\t\t\t\t csum))\n+\t\t\treturn false;\n+\n+\treturn true;\n+}\n+\n static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum)\n {\n \tif (NF_INET_LOCAL_IN == hooknum)\n@@ -1039,12 +1084,13 @@ static int handle_response_icmp(int af, struct sk_buff *skb,\n \t\t\t\tunsigned int hooknum)\n {\n \tunsigned int verdict = NF_DROP;\n+\tint iproto = af == AF_INET6 ? IPPROTO_ICMPV6 : IPPROTO_ICMP;\n \n \tif (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)\n \t\tgoto after_nat;\n \n \t/* Ensure the checksum is correct */\n-\tif (!skb_csum_unnecessary(skb) \u0026\u0026 ip_vs_checksum_complete(skb, ihl)) {\n+\tif (!ip_vs_checksum_common_check(af, skb, iproto, ihl)) {\n \t\t/* Failed checksum! */\n \t\tIP_VS_DBG_BUF(1, \"Forward ICMP: failed checksum from %s!\\n\",\n \t\t\t IP_VS_DBG_ADDR(af, snet));\n@@ -1899,7 +1945,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n \tverdict = NF_DROP;\n \n \t/* Ensure the checksum is correct */\n-\tif (!skb_csum_unnecessary(skb) \u0026\u0026 ip_vs_checksum_complete(skb, ihl)) {\n+\tif (!ip_vs_checksum_common_check(AF_INET, skb, IPPROTO_ICMP, ihl)) {\n \t\t/* Failed checksum! */\n \t\tIP_VS_DBG(1, \"Incoming ICMP: failed checksum from %pI4!\\n\",\n \t\t\t \u0026iph-\u003esaddr);\n@@ -2065,6 +2111,17 @@ static int ip_vs_in_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,\n \t\tgoto out;\n \t}\n \n+\tverdict = NF_DROP;\n+\n+\t/* Ensure the checksum is correct */\n+\tif (!ip_vs_checksum_common_check(AF_INET6, skb, IPPROTO_ICMPV6,\n+\t\t\t\t\t iph-\u003elen)) {\n+\t\t/* Failed checksum! */\n+\t\tIP_VS_DBG(1, \"Incoming ICMPv6: failed checksum from %pI6c!\\n\",\n+\t\t\t \u0026iph-\u003esaddr);\n+\t\tgoto out;\n+\t}\n+\n \t/* do the statistics and put it back */\n \tip_vs_in_stats(cp, skb);\n \ndiff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c\nindex f86b763efcc4dc..e8e6acaf83008a 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_tcp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c\n@@ -304,39 +304,10 @@ static int\n tcp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,\n \t unsigned int tcphoff)\n {\n-\tswitch (skb-\u003eip_summed) {\n-\tcase CHECKSUM_NONE:\n-\t\tskb-\u003ecsum = skb_checksum(skb, tcphoff, skb-\u003elen - tcphoff, 0);\n-\t\tfallthrough;\n-\tcase CHECKSUM_COMPLETE:\n-#ifdef CONFIG_IP_VS_IPV6\n-\t\tif (af == AF_INET6) {\n-\t\t\tif (csum_ipv6_magic(\u0026ipv6_hdr(skb)-\u003esaddr,\n-\t\t\t\t\t \u0026ipv6_hdr(skb)-\u003edaddr,\n-\t\t\t\t\t skb-\u003elen - tcphoff,\n-\t\t\t\t\t IPPROTO_TCP,\n-\t\t\t\t\t skb-\u003ecsum)) {\n-\t\t\t\tIP_VS_DBG_RL_PKT(0, af, pp, skb, 0,\n-\t\t\t\t\t\t \"Failed checksum for\");\n-\t\t\t\treturn 0;\n-\t\t\t}\n-\t\t} else\n-#endif\n-\t\t\tif (csum_tcpudp_magic(ip_hdr(skb)-\u003esaddr,\n-\t\t\t\t\t ip_hdr(skb)-\u003edaddr,\n-\t\t\t\t\t skb-\u003elen - tcphoff,\n-\t\t\t\t\t ip_hdr(skb)-\u003eprotocol,\n-\t\t\t\t\t skb-\u003ecsum)) {\n-\t\t\t\tIP_VS_DBG_RL_PKT(0, af, pp, skb, 0,\n-\t\t\t\t\t\t \"Failed checksum for\");\n-\t\t\t\treturn 0;\n-\t\t\t}\n-\t\tbreak;\n-\tdefault:\n-\t\t/* No need to checksum. */\n-\t\tbreak;\n+\tif (!ip_vs_checksum_common_check(af, skb, IPPROTO_TCP, tcphoff)) {\n+\t\tIP_VS_DBG_RL_PKT(0, af, pp, skb, 0, \"Failed checksum for\");\n+\t\treturn 0;\n \t}\n-\n \treturn 1;\n }\n \ndiff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c\nindex 58f9e255927e2e..4d1d1fc23c2db6 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_udp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c\n@@ -306,40 +306,11 @@ udp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,\n \tif (uh == NULL)\n \t\treturn 0;\n \n-\tif (uh-\u003echeck != 0) {\n-\t\tswitch (skb-\u003eip_summed) {\n-\t\tcase CHECKSUM_NONE:\n-\t\t\tskb-\u003ecsum = skb_checksum(skb, udphoff,\n-\t\t\t\t\t\t skb-\u003elen - udphoff, 0);\n-\t\t\tfallthrough;\n-\t\tcase CHECKSUM_COMPLETE:\n-#ifdef CONFIG_IP_VS_IPV6\n-\t\t\tif (af == AF_INET6) {\n-\t\t\t\tif (csum_ipv6_magic(\u0026ipv6_hdr(skb)-\u003esaddr,\n-\t\t\t\t\t\t \u0026ipv6_hdr(skb)-\u003edaddr,\n-\t\t\t\t\t\t skb-\u003elen - udphoff,\n-\t\t\t\t\t\t IPPROTO_UDP,\n-\t\t\t\t\t\t skb-\u003ecsum)) {\n-\t\t\t\t\tIP_VS_DBG_RL_PKT(0, af, pp, skb, 0,\n-\t\t\t\t\t\t\t \"Failed checksum for\");\n-\t\t\t\t\treturn 0;\n-\t\t\t\t}\n-\t\t\t} else\n-#endif\n-\t\t\t\tif (csum_tcpudp_magic(ip_hdr(skb)-\u003esaddr,\n-\t\t\t\t\t\t ip_hdr(skb)-\u003edaddr,\n-\t\t\t\t\t\t skb-\u003elen - udphoff,\n-\t\t\t\t\t\t ip_hdr(skb)-\u003eprotocol,\n-\t\t\t\t\t\t skb-\u003ecsum)) {\n-\t\t\t\t\tIP_VS_DBG_RL_PKT(0, af, pp, skb, 0,\n-\t\t\t\t\t\t\t \"Failed checksum for\");\n-\t\t\t\t\treturn 0;\n-\t\t\t\t}\n-\t\t\tbreak;\n-\t\tdefault:\n-\t\t\t/* No need to checksum. */\n-\t\t\tbreak;\n-\t\t}\n+\tif (!uh-\u003echeck)\n+\t\treturn 1;\n+\tif (!ip_vs_checksum_common_check(af, skb, IPPROTO_UDP, udphoff)) {\n+\t\tIP_VS_DBG_RL_PKT(0, af, pp, skb, 0, \"Failed checksum for\");\n+\t\treturn 0;\n \t}\n \treturn 1;\n }\n"
} |
| 2/1 | 2026/07/10 18:21 | agent | patch-evaluator |
1mModel:gemini-3.1-pro-preview Args: null Results: {
"EnableConfigs": [
"IP_VS",
"IP_VS_IPV6",
"IP_VS_PROTO_TCP",
"IP_VS_PROTO_UDP"
],
"FocusSymbols": [
"ip_vs_checksum_common_check",
"ip_vs_in_icmp_v6",
"ip_vs_in_icmp",
"handle_response_icmp",
"tcp_csum_check",
"udp_csum_check"
],
"Reasoning": "The patch introduces a new common checksum validation function for IPVS and uses it across TCP, UDP, and ICMP protocols. It also adds checksum validation for incoming ICMPv6 packets. Fuzzing should focus on these checksum validation paths to ensure they correctly handle malformed packets.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Do not list too generic configs (we already have them enabled). Only list those that specifically cover the modified code. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes:
commit 2d0e416dc5e500879e13b7e48891181152f0fa95
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Jul 10 18:21:47 2026 +0000
syz-cluster: applied patch under review
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 417ff51f62fc8e..cd65dd3a4ad1f6 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -2066,8 +2066,6 @@ void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
struct ip_vs_conn *cp, int dir);
#endif
-__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
-
static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
{
__be32 diff[2] = { ~old, new };
@@ -2093,6 +2091,9 @@ static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
return csum_partial(diff, sizeof(diff), oldsum);
}
+bool ip_vs_checksum_common_check(int af, struct sk_buff *skb, int proto,
+ int offset);
+
/* Forget current conntrack (unconfirmed) and attach notrack entry */
static inline void ip_vs_notrack(struct sk_buff *skb)
{
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 35cbe821c25967..6cae4ea45d55ab 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -867,11 +867,56 @@ static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs) { return 0; }
#endif
-__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)
+static __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)
{
return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0));
}
+/**
+ * ip_vs_checksum_common_check - validate checksum for TCP/UDP/ICMP
+ * @af: AF_INET/AF_INET6
+ * @skb: socket buffer
+ * @proto: IPPROTO_xxx
+ * @offset: offset of protocol header
+ */
+bool ip_vs_checksum_common_check(int af, struct sk_buff *skb, int proto,
+ int offset)
+{
+ __wsum csum;
+
+ if (skb_csum_unnecessary(skb))
+ return true;
+ if (skb->ip_summed == CHECKSUM_NONE) {
+ csum = skb_checksum(skb, offset, skb->len - offset, 0);
+ } else if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ /* IPVS works at IP layer, so skb->csum covers data from
+ * IP header, strip it up to the protocol header
+ */
+ csum = csum_sub(skb->csum, skb_checksum(skb, 0, offset, 0));
+ } else {
+ /* No need to checksum. */
+ return true;
+ }
+#ifdef CONFIG_IP_VS_IPV6
+ if (af == AF_INET6) {
+ if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ skb->len - offset, proto,
+ csum))
+ return false;
+ } else
+#endif
+ if (proto == IPPROTO_ICMP)
+ return !csum_fold(csum);
+ else if (csum_tcpudp_magic(ip_hdr(skb)->saddr,
+ ip_hdr(skb)->daddr,
+ skb->len - offset, proto,
+ csum))
+ return false;
+
+ return true;
+}
+
static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum)
{
if (NF_INET_LOCAL_IN == hooknum)
@@ -1039,12 +1084,13 @@ static int handle_response_icmp(int af, struct sk_buff *skb,
unsigned int hooknum)
{
unsigned int verdict = NF_DROP;
+ int iproto = af == AF_INET6 ? IPPROTO_ICMPV6 : IPPROTO_ICMP;
if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
goto after_nat;
/* Ensure the checksum is correct */
- if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
+ if (!ip_vs_checksum_common_check(af, skb, iproto, ihl)) {
/* Failed checksum! */
IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n",
IP_VS_DBG_ADDR(af, snet));
@@ -1899,7 +1945,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
verdict = NF_DROP;
/* Ensure the checksum is correct */
- if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
+ if (!ip_vs_checksum_common_check(AF_INET, skb, IPPROTO_ICMP, ihl)) {
/* Failed checksum! */
IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n",
&iph->saddr);
@@ -2065,6 +2111,17 @@ static int ip_vs_in_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,
goto out;
}
+ verdict = NF_DROP;
+
+ /* Ensure the checksum is correct */
+ if (!ip_vs_checksum_common_check(AF_INET6, skb, IPPROTO_ICMPV6,
+ iph->len)) {
+ /* Failed checksum! */
+ IP_VS_DBG(1, "Incoming ICMPv6: failed checksum from %pI6c!\n",
+ &iph->saddr);
+ goto out;
+ }
+
/* do the statistics and put it back */
ip_vs_in_stats(cp, skb);
diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c
index f86b763efcc4dc..e8e6acaf83008a 100644
--- a/net/netfilter/ipvs/ip_vs_proto_tcp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c
@@ -304,39 +304,10 @@ static int
tcp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
unsigned int tcphoff)
{
- switch (skb->ip_summed) {
- case CHECKSUM_NONE:
- skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
- fallthrough;
- case CHECKSUM_COMPLETE:
-#ifdef CONFIG_IP_VS_IPV6
- if (af == AF_INET6) {
- if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
- &ipv6_hdr(skb)->daddr,
- skb->len - tcphoff,
- IPPROTO_TCP,
- skb->csum)) {
- IP_VS_DBG_RL_PKT(0, af, pp, skb, 0,
- "Failed checksum for");
- return 0;
- }
- } else
-#endif
- if (csum_tcpudp_magic(ip_hdr(skb)->saddr,
- ip_hdr(skb)->daddr,
- skb->len - tcphoff,
- ip_hdr(skb)->protocol,
- skb->csum)) {
- IP_VS_DBG_RL_PKT(0, af, pp, skb, 0,
- "Failed checksum for");
- return 0;
- }
- break;
- default:
- /* No need to checksum. */
- break;
+ if (!ip_vs_checksum_common_check(af, skb, IPPROTO_TCP, tcphoff)) {
+ IP_VS_DBG_RL_PKT(0, af, pp, skb, 0, "Failed checksum for");
+ return 0;
}
-
return 1;
}
diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c
index 58f9e255927e2e..4d1d1fc23c2db6 100644
--- a/net/netfilter/ipvs/ip_vs_proto_udp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c
@@ -306,40 +306,11 @@ udp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
if (uh == NULL)
return 0;
- if (uh->check != 0) {
- switch (skb->ip_summed) {
- case CHECKSUM_NONE:
- skb->csum = skb_checksum(skb, udphoff,
- skb->len - udphoff, 0);
- fallthrough;
- case CHECKSUM_COMPLETE:
-#ifdef CONFIG_IP_VS_IPV6
- if (af == AF_INET6) {
- if (csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
- &ipv6_hdr(skb)->daddr,
- skb->len - udphoff,
- IPPROTO_UDP,
- skb->csum)) {
- IP_VS_DBG_RL_PKT(0, af, pp, skb, 0,
- "Failed checksum for");
- return 0;
- }
- } else
-#endif
- if (csum_tcpudp_magic(ip_hdr(skb)->saddr,
- ip_hdr(skb)->daddr,
- skb->len - udphoff,
- ip_hdr(skb)->protocol,
- skb->csum)) {
- IP_VS_DBG_RL_PKT(0, af, pp, skb, 0,
- "Failed checksum for");
- return 0;
- }
- break;
- default:
- /* No need to checksum. */
- break;
- }
+ if (!uh->check)
+ return 1;
+ if (!ip_vs_checksum_common_check(af, skb, IPPROTO_UDP, udphoff)) {
+ IP_VS_DBG_RL_PKT(0, af, pp, skb, 0, "Failed checksum for");
+ return 0;
}
return 1;
}
|
| 3/2 | 2026/07/10 18:21 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 4735 output: 23 thoughts: 204 Thoughts: **Analyzing the IPVS Checksum Validation Patch** Okay, so I'm looking at this patch for IPVS and my initial impression is that it's unifying the checksum validation logic. They've introduced this `ip_vs_checksum_common_check` function, which is being called in `ip_vs_core.c`, `ip_vs_proto_tcp.c`, and `ip_vs_proto_udp.c`. This strongly suggests a move towards a more consistent approach to handling checksums across TCP, UDP, and ICMP within the IPVS framework. The addition of checksum validation for incoming ICMPv6 packets in `ip_vs_in_icmp_v6` is also something to make note of. Now, before I dig too deep into the code itself, I want to make sure I understand the environment. I need to confirm that IPVS is even available and correctly configured in the testing setup. I know it's part of netfilter, but I need to quickly verify the kernel configs are set. I'll need to check for `CONFIG_IP_VS`, `CONFIG_IP_VS_IPV6`, `CONFIG_IP_VS_PROTO_TCP`, and `CONFIG_IP_VS_PROTO_UDP`. Okay, next I'll search the tree for calls to `ip_vs_checksum_common_check`. This will help me understand its exact usage context, find all the code affected by this patch, and how it is being used. From there, I can begin to really assess the implications and potential impacts of this change. |
| 4/2 | 2026/07/10 18:21 | tool | grepper |
0mArgs:{
"Expression": "ip_vs_checksum_common_check"
}Results: {
"Output": "include/net/ip_vs.h=2087=static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)\n--\ninclude/net/ip_vs.h-2093-\ninclude/net/ip_vs.h:2094:bool ip_vs_checksum_common_check(int af, struct sk_buff *skb, int proto,\ninclude/net/ip_vs.h-2095-\t\t\t\t int offset);\n--\nnet/netfilter/ipvs/ip_vs_core.c=870=static __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)\n--\nnet/netfilter/ipvs/ip_vs_core.c-875-/**\nnet/netfilter/ipvs/ip_vs_core.c:876: * ip_vs_checksum_common_check - validate checksum for TCP/UDP/ICMP\nnet/netfilter/ipvs/ip_vs_core.c-877- * @af: AF_INET/AF_INET6\n--\nnet/netfilter/ipvs/ip_vs_core.c-881- */\nnet/netfilter/ipvs/ip_vs_core.c:882:bool ip_vs_checksum_common_check(int af, struct sk_buff *skb, int proto,\nnet/netfilter/ipvs/ip_vs_core.c-883-\t\t\t\t int offset)\n--\nnet/netfilter/ipvs/ip_vs_core.c=1079=static int handle_response_icmp(int af, struct sk_buff *skb,\n--\nnet/netfilter/ipvs/ip_vs_core.c-1092-\t/* Ensure the checksum is correct */\nnet/netfilter/ipvs/ip_vs_core.c:1093:\tif (!ip_vs_checksum_common_check(af, skb, iproto, ihl)) {\nnet/netfilter/ipvs/ip_vs_core.c-1094-\t\t/* Failed checksum! */\n--\nnet/netfilter/ipvs/ip_vs_core.c=1802=ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,\n--\nnet/netfilter/ipvs/ip_vs_core.c-1947-\t/* Ensure the checksum is correct */\nnet/netfilter/ipvs/ip_vs_core.c:1948:\tif (!ip_vs_checksum_common_check(AF_INET, skb, IPPROTO_ICMP, ihl)) {\nnet/netfilter/ipvs/ip_vs_core.c-1949-\t\t/* Failed checksum! */\n--\nnet/netfilter/ipvs/ip_vs_core.c=2034=static int ip_vs_in_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,\n--\nnet/netfilter/ipvs/ip_vs_core.c-2116-\t/* Ensure the checksum is correct */\nnet/netfilter/ipvs/ip_vs_core.c:2117:\tif (!ip_vs_checksum_common_check(AF_INET6, skb, IPPROTO_ICMPV6,\nnet/netfilter/ipvs/ip_vs_core.c-2118-\t\t\t\t\t iph-\u003elen)) {\n--\nnet/netfilter/ipvs/ip_vs_proto_tcp.c=304=tcp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,\n--\nnet/netfilter/ipvs/ip_vs_proto_tcp.c-306-{\nnet/netfilter/ipvs/ip_vs_proto_tcp.c:307:\tif (!ip_vs_checksum_common_check(af, skb, IPPROTO_TCP, tcphoff)) {\nnet/netfilter/ipvs/ip_vs_proto_tcp.c-308-\t\tIP_VS_DBG_RL_PKT(0, af, pp, skb, 0, \"Failed checksum for\");\n--\nnet/netfilter/ipvs/ip_vs_proto_udp.c=300=udp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,\n--\nnet/netfilter/ipvs/ip_vs_proto_udp.c-310-\t\treturn 1;\nnet/netfilter/ipvs/ip_vs_proto_udp.c:311:\tif (!ip_vs_checksum_common_check(af, skb, IPPROTO_UDP, udphoff)) {\nnet/netfilter/ipvs/ip_vs_proto_udp.c-312-\t\tIP_VS_DBG_RL_PKT(0, af, pp, skb, 0, \"Failed checksum for\");\n"
} |
| 5/2 | 2026/07/10 18:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 6523 output: 21 thoughts: 90 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: **Checksum Validation in IPVS: A Quick Review** Alright, so this patch introduces a shared checksum validation function for IPVS. Smart move, centralizing that and promoting reusability. It's used in a few places, which is exactly what I'd expect. From a functional standpoint, based on the notes, it seems solid; it's definitely reachable code. Now, let's see, what configs are needed? `IP_VS`, `IP_VS_IPV6`, `IP_VS_PROTO_TCP`, and `IP_VS_PROTO_UDP` are mentioned. Hmm, before I get too far into reviewing the implementation details, I'm going to quickly double-check that those TCP and UDP protocol options are actually present and well-defined in the relevant config files. Better to verify assumptions upfront. Gotta make sure those dependencies are handled correctly. Okay, let's take a quick look... |
| 6/2 | 2026/07/10 18:22 | tool | grepper |
0mArgs:{
"Expression": "IP_VS_PROTO_TCP"
}Results: {
"Output": "arch/loongarch/configs/loongson32_defconfig=251=CONFIG_IP_VS_IPV6=y\narch/loongarch/configs/loongson32_defconfig:252:CONFIG_IP_VS_PROTO_TCP=y\narch/loongarch/configs/loongson32_defconfig-253-CONFIG_IP_VS_PROTO_UDP=y\n--\narch/loongarch/configs/loongson64_defconfig=267=CONFIG_IP_VS_IPV6=y\narch/loongarch/configs/loongson64_defconfig:268:CONFIG_IP_VS_PROTO_TCP=y\narch/loongarch/configs/loongson64_defconfig-269-CONFIG_IP_VS_PROTO_UDP=y\n--\narch/mips/configs/bigsur_defconfig=67=CONFIG_IP_VS_IPV6=y\narch/mips/configs/bigsur_defconfig:68:CONFIG_IP_VS_PROTO_TCP=y\narch/mips/configs/bigsur_defconfig-69-CONFIG_IP_VS_PROTO_UDP=y\n--\narch/mips/configs/ip22_defconfig=107=CONFIG_IP_VS_IPV6=y\narch/mips/configs/ip22_defconfig:108:CONFIG_IP_VS_PROTO_TCP=y\narch/mips/configs/ip22_defconfig-109-CONFIG_IP_VS_PROTO_UDP=y\n--\narch/mips/configs/malta_defconfig=107=CONFIG_IP_VS_IPV6=y\narch/mips/configs/malta_defconfig:108:CONFIG_IP_VS_PROTO_TCP=y\narch/mips/configs/malta_defconfig-109-CONFIG_IP_VS_PROTO_UDP=y\n--\narch/mips/configs/malta_kvm_defconfig=111=CONFIG_IP_VS_IPV6=y\narch/mips/configs/malta_kvm_defconfig:112:CONFIG_IP_VS_PROTO_TCP=y\narch/mips/configs/malta_kvm_defconfig-113-CONFIG_IP_VS_PROTO_UDP=y\n--\narch/mips/configs/maltaup_xpa_defconfig=108=CONFIG_IP_VS_IPV6=y\narch/mips/configs/maltaup_xpa_defconfig:109:CONFIG_IP_VS_PROTO_TCP=y\narch/mips/configs/maltaup_xpa_defconfig-110-CONFIG_IP_VS_PROTO_UDP=y\n--\narch/riscv/configs/defconfig=74=CONFIG_IP_VS=m\narch/riscv/configs/defconfig:75:CONFIG_IP_VS_PROTO_TCP=y\narch/riscv/configs/defconfig-76-CONFIG_IP_VS_PROTO_UDP=y\n--\narch/s390/configs/debug_defconfig=313=CONFIG_IP_VS=m\narch/s390/configs/debug_defconfig:314:CONFIG_IP_VS_PROTO_TCP=y\narch/s390/configs/debug_defconfig-315-CONFIG_IP_VS_PROTO_UDP=y\n--\narch/s390/configs/defconfig=304=CONFIG_IP_VS=m\narch/s390/configs/defconfig:305:CONFIG_IP_VS_PROTO_TCP=y\narch/s390/configs/defconfig-306-CONFIG_IP_VS_PROTO_UDP=y\n--\ninclude/net/ip_vs.h=1148=struct netns_ipvs {\n--\ninclude/net/ip_vs.h-1162-\t/* ip_vs_proto_tcp */\ninclude/net/ip_vs.h:1163:#ifdef CONFIG_IP_VS_PROTO_TCP\ninclude/net/ip_vs.h-1164-\t#define\tTCP_APP_TAB_BITS\t4\n--\ninclude/net/ip_vs.h=2202=ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)\n--\ninclude/net/ip_vs.h-2213-\ninclude/net/ip_vs.h:2214:#ifdef CONFIG_IP_VS_PROTO_TCP\ninclude/net/ip_vs.h-2215-INDIRECT_CALLABLE_DECLARE(int\n--\nnet/netfilter/ipvs/Kconfig=77=comment \"IPVS transport protocol load balancing support\"\nnet/netfilter/ipvs/Kconfig-78-\nnet/netfilter/ipvs/Kconfig:79:config\tIP_VS_PROTO_TCP\nnet/netfilter/ipvs/Kconfig-80-\tbool \"TCP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig=321=config\tIP_VS_FTP\nnet/netfilter/ipvs/Kconfig-322-\ttristate \"FTP protocol helper\"\nnet/netfilter/ipvs/Kconfig:323:\tdepends on IP_VS_PROTO_TCP \u0026\u0026 NF_CONNTRACK \u0026\u0026 NF_NAT \u0026\u0026 \\\nnet/netfilter/ipvs/Kconfig-324-\t\tNF_CONNTRACK_FTP\n--\nnet/netfilter/ipvs/Makefile=7=ip_vs_proto-objs-y :=\nnet/netfilter/ipvs/Makefile:8:ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_TCP) += ip_vs_proto_tcp.o\nnet/netfilter/ipvs/Makefile-9-ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_UDP) += ip_vs_proto_udp.o\n--\nnet/netfilter/ipvs/ip_vs_core.c=60=EXPORT_SYMBOL(ip_vs_conn_out_get);\nnet/netfilter/ipvs/ip_vs_core.c:61:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_core.c-62-EXPORT_SYMBOL(ip_vs_tcp_conn_listen);\n--\nnet/netfilter/ipvs/ip_vs_core.c=68=EXPORT_SYMBOL(ip_vs_new_conn_out);\nnet/netfilter/ipvs/ip_vs_core.c-69-\nnet/netfilter/ipvs/ip_vs_core.c:70:#if defined(CONFIG_IP_VS_PROTO_TCP) \u0026\u0026 defined(CONFIG_IP_VS_PROTO_UDP)\nnet/netfilter/ipvs/ip_vs_core.c-71-#define SNAT_CALL(f, ...) \\\nnet/netfilter/ipvs/ip_vs_core.c-72-\tINDIRECT_CALL_2(f, tcp_snat_handler, udp_snat_handler, __VA_ARGS__)\nnet/netfilter/ipvs/ip_vs_core.c:73:#elif defined(CONFIG_IP_VS_PROTO_TCP)\nnet/netfilter/ipvs/ip_vs_core.c-74-#define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, tcp_snat_handler, __VA_ARGS__)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=3306=static int ip_vs_set_timeout(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)\nnet/netfilter/ipvs/ip_vs_ctl.c-3307-{\nnet/netfilter/ipvs/ip_vs_ctl.c:3308:#if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)\nnet/netfilter/ipvs/ip_vs_ctl.c-3309-\tstruct ip_vs_proto_data *pd;\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3316-\nnet/netfilter/ipvs/ip_vs_ctl.c:3317:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_ctl.c-3318-\tif (u-\u003etcp_timeout \u003c 0 || u-\u003etcp_timeout \u003e (INT_MAX / HZ) ||\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3328-\nnet/netfilter/ipvs/ip_vs_ctl.c:3329:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_ctl.c-3330-\tif (u-\u003etcp_timeout) {\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=3690=__ip_vs_get_timeouts(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)\nnet/netfilter/ipvs/ip_vs_ctl.c-3691-{\nnet/netfilter/ipvs/ip_vs_ctl.c:3692:#if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)\nnet/netfilter/ipvs/ip_vs_ctl.c-3693-\tstruct ip_vs_proto_data *pd;\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3697-\nnet/netfilter/ipvs/ip_vs_ctl.c:3698:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_ctl.c-3699-\tpd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=4766=static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-4823-\t\t__ip_vs_get_timeouts(ipvs, \u0026t);\nnet/netfilter/ipvs/ip_vs_ctl.c:4824:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_ctl.c-4825-\t\tif (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,\n--\nnet/netfilter/ipvs/ip_vs_proto.c=295=int __net_init ip_vs_protocol_net_init(struct netns_ipvs *ipvs)\n--\nnet/netfilter/ipvs/ip_vs_proto.c-298-\tstatic struct ip_vs_protocol *protos[] = {\nnet/netfilter/ipvs/ip_vs_proto.c:299:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_proto.c-300- \u0026ip_vs_protocol_tcp,\n--\nnet/netfilter/ipvs/ip_vs_proto.c=340=int __init ip_vs_protocol_init(void)\n--\nnet/netfilter/ipvs/ip_vs_proto.c-349-\nnet/netfilter/ipvs/ip_vs_proto.c:350:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_proto.c-351-\tREGISTER_PROTOCOL(\u0026ip_vs_protocol_tcp);\n--\ntools/testing/selftests/net/netfilter/config=38=CONFIG_IP_VS=m\ntools/testing/selftests/net/netfilter/config:39:CONFIG_IP_VS_PROTO_TCP=y\ntools/testing/selftests/net/netfilter/config-40-CONFIG_IP_VS_RR=m\n"
} |
| 7/2 | 2026/07/10 18:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9785 output: 22 thoughts: 85 Thoughts: Here's my thought process, as if I were considering this issue: **Analyzing IPVS Protocol Configuration** Okay, so I see `CONFIG_IP_VS_PROTO_TCP` and `CONFIG_IP_VS_PROTO_UDP` as legitimate configurations – nothing jumps out as immediately wrong there. Now, hold on a second... I recall that `CONFIG_IP_VS_PROTO_TCP` is a boolean configuration, and I'm pretty sure it's enabled by default in a *lot* of defconfigs I've worked with. I should double check that. Let me quickly go look at `net/netfilter/ipvs/Kconfig` to confirm if it defaults to 'y' as I suspect. That should clarify everything. |
| 8/2 | 2026/07/10 18:22 | tool | grepper |
0mError:no matches Args: {
"Expression": "config IP_VS_PROTO_TCP"
}Results: {
"error": "no matches"
} |
| 9/2 | 2026/07/10 18:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10065 output: 23 thoughts: 17 Thoughts: Okay, here's my interpretation of that: **Diving into Configuration: IP vs. Proto TCP** Right, let me see. That string immediately throws up a flag. "config" – that tells me I'm looking at a configuration file or path. Then, the tab separator—that's interesting, but not unusual for a key-value structure, and the rest is clearly the key. "IP\_VS\_PROTO\_TCP"... yep, this points directly to something related to IP Virtual Server (IPVS), and specifically, how it's handling TCP traffic. I'm likely examining a setting that defines how TCP traffic is routed or managed by an IPVS configuration. Might be a routing policy, a health check setting for TCP services, or the way TCP connections are handled in the context of load balancing. This tells me about the type of traffic and where it's directed. I'll need to know more context to understand how the particular configuration file interacts with the network environment. |
| 10/2 | 2026/07/10 18:22 | tool | grepper |
0mArgs:{
"Expression": "config.*IP_VS_PROTO_TCP"
}Results: {
"Output": "net/netfilter/ipvs/Kconfig=77=comment \"IPVS transport protocol load balancing support\"\nnet/netfilter/ipvs/Kconfig-78-\nnet/netfilter/ipvs/Kconfig:79:config\tIP_VS_PROTO_TCP\nnet/netfilter/ipvs/Kconfig-80-\tbool \"TCP load balancing support\"\n"
} |
| 11/2 | 2026/07/10 18:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10412 output: 37 thoughts: 22 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Diving into the IPVS Configuration** Okay, so I need to understand something about the IPVS configuration. Let's start with the source of truth, and that's generally the Kconfig file. I'll navigate to `net/netfilter/ipvs/Kconfig` – should be a good starting point for understanding how the IPVS options are presented and handled during kernel configuration. Specifically, I'm going to jump around line 79. That's likely where the core options are declared. I expect to find things like the default behavior. I'll be looking for any hints about dependencies, defaults, and the structure of the options. This might reveal some interesting quirks or implementation decisions that I haven't considered previously, which could be relevant to the issue I'm looking at. Let's see what's there. |
| 12/2 | 2026/07/10 18:22 | tool | read-file |
0mArgs:{
"File": "net/netfilter/ipvs/Kconfig",
"FirstLine": 70,
"LineCount": 30
}Results: {
"Contents": " 70:\t\t each hash entry uses 8 bytes, so you can estimate how much memory is\n 71:\t\t needed for your box.\n 72:\t\n 73:\t\t You can overwrite this number setting conn_tab_bits module parameter\n 74:\t\t or by appending ip_vs.conn_tab_bits=? to the kernel command line if\n 75:\t\t IP VS was compiled built-in.\n 76:\t\n 77:\tcomment \"IPVS transport protocol load balancing support\"\n 78:\t\n 79:\tconfig\tIP_VS_PROTO_TCP\n 80:\t\tbool \"TCP load balancing support\"\n 81:\t\thelp\n 82:\t\t This option enables support for load balancing TCP transport\n 83:\t\t protocol. Say Y if unsure.\n 84:\t\n 85:\tconfig\tIP_VS_PROTO_UDP\n 86:\t\tbool \"UDP load balancing support\"\n 87:\t\thelp\n 88:\t\t This option enables support for load balancing UDP transport\n 89:\t\t protocol. Say Y if unsure.\n 90:\t\n 91:\tconfig\tIP_VS_PROTO_AH_ESP\n 92:\t\tdef_bool IP_VS_PROTO_ESP || IP_VS_PROTO_AH\n 93:\t\n 94:\tconfig\tIP_VS_PROTO_ESP\n 95:\t\tbool \"ESP load balancing support\"\n 96:\t\thelp\n 97:\t\t This option enables support for load balancing ESP (Encapsulation\n 98:\t\t Security Payload) transport protocol. Say Y if unsure.\n 99:\t\n"
} |
| 13/2 | 2026/07/10 18:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11077 output: 20 thoughts: 288 Thoughts: **Analyzing the IPVS Checksum Patch** Alright, let's break this down. First, `IP_VS_PROTO_TCP` and `IP_VS_PROTO_UDP` are expected; those are pretty standard. Now, this patch appears to be centered around modifying the checksum handling within IPVS. Specifically, it introduces `ip_vs_checksum_common_check` and then leverages it across `ip_vs_core.c`, `ip_vs_proto_tcp.c`, and `ip_vs_proto_udp.c`. That's the core focus, that function. Beyond that, I'm seeing modifications to `ip_vs_in_icmp_v6`, `ip_vs_in_icmp`, and `handle_response_icmp`, which are likely related to ICMP traffic handling in relation to checksum validation. Okay, time to dive into `ip_vs_checksum_common_check` itself. Let's start with `net/netfilter/ipvs/ip_vs_core.c`. Aha! It's a new function; that's the key. I need to understand its logic. I'm focusing on the symbols `ip_vs_checksum_common_check`, `ip_vs_in_icmp_v6`, `ip_vs_in_icmp`, `handle_response_icmp`, and also `tcp_csum_check` and `udp_csum_check`. Wait a minute, aren't `tcp_csum_check` and `udp_csum_check` defined as static functions in `ip_vs_proto_tcp.c` and `ip_vs_proto_udp.c`? Gotta confirm that they're static to understand the scope of their use. |
| 14/2 | 2026/07/10 18:22 | tool | grepper |
0mArgs:{
"Expression": "tcp_csum_check"
}Results: {
"Output": "net/netfilter/ipvs/ip_vs_proto_tcp.c=30=static int\nnet/netfilter/ipvs/ip_vs_proto_tcp.c:31:tcp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,\nnet/netfilter/ipvs/ip_vs_proto_tcp.c-32-\t unsigned int tcphoff);\n--\nnet/netfilter/ipvs/ip_vs_proto_tcp.c=147=tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,\n--\nnet/netfilter/ipvs/ip_vs_proto_tcp.c-168-\t\t/* Some checks before mangling */\nnet/netfilter/ipvs/ip_vs_proto_tcp.c:169:\t\tif (!tcp_csum_check(cp-\u003eaf, skb, pp, tcphoff))\nnet/netfilter/ipvs/ip_vs_proto_tcp.c-170-\t\t\treturn 0;\n--\nnet/netfilter/ipvs/ip_vs_proto_tcp.c=225=tcp_dnat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,\n--\nnet/netfilter/ipvs/ip_vs_proto_tcp.c-246-\t\t/* Some checks before mangling */\nnet/netfilter/ipvs/ip_vs_proto_tcp.c:247:\t\tif (!tcp_csum_check(cp-\u003eaf, skb, pp, tcphoff))\nnet/netfilter/ipvs/ip_vs_proto_tcp.c-248-\t\t\treturn 0;\n--\nnet/netfilter/ipvs/ip_vs_proto_tcp.c=303=static int\nnet/netfilter/ipvs/ip_vs_proto_tcp.c:304:tcp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,\nnet/netfilter/ipvs/ip_vs_proto_tcp.c-305-\t unsigned int tcphoff)\n"
} |
| 15/2 | 2026/07/10 18:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12300 output: 20 thoughts: 88 Thoughts: **Checksum Verification Targets** Okay, so I've confirmed that these elements are indeed static. Therefore, the checksum verification should center around these key symbols: `ip_vs_checksum_common_check`, `ip_vs_in_icmp_v6`, `ip_vs_in_icmp`, `handle_response_icmp`, `tcp_csum_check`, and `udp_csum_check`. I want to drill down specifically on `udp_csum_check` now to ensure proper validation. |
| 16/2 | 2026/07/10 18:22 | tool | grepper |
0mArgs:{
"Expression": "udp_csum_check"
}Results: {
"Output": "net/netfilter/ipvs/ip_vs_proto_udp.c=26=static int\nnet/netfilter/ipvs/ip_vs_proto_udp.c:27:udp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,\nnet/netfilter/ipvs/ip_vs_proto_udp.c-28-\t unsigned int udphoff);\n--\nnet/netfilter/ipvs/ip_vs_proto_udp.c=136=udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,\n--\nnet/netfilter/ipvs/ip_vs_proto_udp.c-157-\t\t/* Some checks before mangling */\nnet/netfilter/ipvs/ip_vs_proto_udp.c:158:\t\tif (!udp_csum_check(cp-\u003eaf, skb, pp, udphoff))\nnet/netfilter/ipvs/ip_vs_proto_udp.c-159-\t\t\treturn 0;\n--\nnet/netfilter/ipvs/ip_vs_proto_udp.c=219=udp_dnat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,\n--\nnet/netfilter/ipvs/ip_vs_proto_udp.c-240-\t\t/* Some checks before mangling */\nnet/netfilter/ipvs/ip_vs_proto_udp.c:241:\t\tif (!udp_csum_check(cp-\u003eaf, skb, pp, udphoff))\nnet/netfilter/ipvs/ip_vs_proto_udp.c-242-\t\t\treturn 0;\n--\nnet/netfilter/ipvs/ip_vs_proto_udp.c=299=static int\nnet/netfilter/ipvs/ip_vs_proto_udp.c:300:udp_csum_check(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,\nnet/netfilter/ipvs/ip_vs_proto_udp.c-301-\t unsigned int udphoff)\n"
} |
| 17/2 | 2026/07/10 18:22 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13053 output: 182 thoughts: 492 Thoughts: **IPVS Checksum Validation Patch Analysis** Okay, let's break this down. First, the configs. We're looking at `IP_VS`, `IP_VS_IPV6`, `IP_VS_PROTO_TCP`, and `IP_VS_PROTO_UDP`. While `IP_VS_PROTO_TCP` and `IP_VS_PROTO_UDP` are often enabled by default in various defconfigs, it's good practice to explicitly specify them here for clarity and to make sure they are definitely enabled. Always good to be explicit, rather than implicit. Now, let's see what's being touched. The patch modifies `ip_vs_core.c`, `ip_vs_proto_tcp.c`, and `ip_vs_proto_udp.c`. Okay, so it's core to IPVS and involves the TCP/UDP protocol implementations. A quick check to see if `ip_vs_checksum_common_check` is exported...Nope, it's internal to the module. No problem, that doesn't change anything, just noting that for later. Next, I need to confirm whether `IP_VS_PROTO_TCP` and `IP_VS_PROTO_UDP` are actually *needed* here. Ah, yes, they are, as the implementations utilize `ip_vs_checksum_common_check` for the TCP and UDP checksum verification paths. And `IP_VS_IPV6` is, of course, necessary because `ip_vs_checksum_common_check` deals with IPv6 parts, as does `ip_vs_in_icmp_v6`. Let's double-check the code snippet: ```c bool ip_vs_checksum_common_check(int af, struct sk_buff *skb, int proto, int offset) ``` This is the crux of the patch: a new checksum validation function. It's a common function, which makes it particularly interesting. And yes, absolutely, this is definitely something we need to fuzz. Checksum validation is a classic attack vector, and a shared function like this is an even richer target. Okay, time to formulate the response. **WorthFuzzing: true** **EnableConfigs: `IP_VS`, `IP_VS_IPV6`, `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`** **FocusSymbols: `ip_vs_checksum_common_check`, `ip_vs_in_icmp_v6`, `ip_vs_in_icmp`, `handle_response_icmp`, `tcp_csum_check`, `udp_csum_check`** **Reasoning:** The patch introduces a new common checksum validation function for IPVS and uses it across TCP, UDP, and ICMP protocols. It also adds checksum validation for incoming ICMPv6 packets. Fuzzing should focus on these checksum validation paths to ensure they correctly handle malformed packets. Specifically, the common function and associated functions in each protocol. |
| 18/2 | 2026/07/10 18:22 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"IP_VS",
"IP_VS_IPV6",
"IP_VS_PROTO_TCP",
"IP_VS_PROTO_UDP"
],
"FocusSymbols": [
"ip_vs_checksum_common_check",
"ip_vs_in_icmp_v6",
"ip_vs_in_icmp",
"handle_response_icmp",
"tcp_csum_check",
"udp_csum_check"
],
"Reasoning": "The patch introduces a new common checksum validation function for IPVS and uses it across TCP, UDP, and ICMP protocols. It also adds checksum validation for incoming ICMPv6 packets. Fuzzing should focus on these checksum validation paths to ensure they correctly handle malformed packets.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"IP_VS",
"IP_VS_IPV6",
"IP_VS_PROTO_TCP",
"IP_VS_PROTO_UDP"
],
"FocusSymbols": [
"ip_vs_checksum_common_check",
"ip_vs_in_icmp_v6",
"ip_vs_in_icmp",
"handle_response_icmp",
"tcp_csum_check",
"udp_csum_check"
],
"Reasoning": "The patch introduces a new common checksum validation function for IPVS and uses it across TCP, UDP, and ICMP protocols. It also adds checksum validation for incoming ICMPv6 packets. Fuzzing should focus on these checksum validation paths to ensure they correctly handle malformed packets.",
"WorthFuzzing": true
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
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| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|