AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/09/11 18:46	flow	patch-triage	2m Args: null Results: { "EnableConfigs": [ "IP_VS", "NETFILTER", "INET" ], "FocusSymbols": [ "ip_vs_sync_validate_flags", "ip_vs_process_message_v0", "ip_vs_proc_sync_conn", "ip_vs_process_message", "sync_thread_backup", "start_sync_thread" ], "KMSANReasoning": "The patch introduces flag validation (`ip_vs_sync_validate_flags`) in the IPVS synchronization message handling functions (`ip_vs_process_message_v0` and `ip_vs_proc_sync_conn`) to reject invalid flag combinations (e.g., `IP_VS_CONN_F_ONE_PACKET` or `IP_VS_CONN_F_NO_CPORT` combined with `IP_VS_CONN_F_TEMPLATE`). The flags variable is directly initialized from received network packet data (`ntohs` / `ntohl`), and the validation logic only adds early rejection of invalid sync messages. No heap/stack memory allocations are introduced or modified, no buffer length calculations or copying to user space are altered, and no uninitialized variables or struct padding are read or exposed. Any potential issues stemming from incompatible flags (such as state inconsistencies, refcount errors, or use-after-free) are detectable by standard KASAN/refcount checks. Therefore, a dedicated KMSAN fuzzing session is not needed.", "NeedsKMSAN": false, "Reasoning": "The patch introduces flag validation (ip_vs_sync_validate_flags) and proper masking when parsing incoming IPVS sync messages in the backup daemon, rejecting incompatible flags such as IP_VS_CONN_F_NO_CPORT with IP_VS_CONN_F_TEMPLATE or IP_VS_CONN_F_ONE_PACKET in both v0 and v1 message formats. This modifies reachable network protocol processing in netfilter/IPVS and warrants fuzzing.", "WorthFuzzing": true }
1/1	2026/09/11 18:46	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 6f726991e6af6971311a0a00692b0a1bb1c2393d\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Fri Sep 11 18:46:36 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c\nindex 5383aeafb0aed..69dc28153ec12 100644\n--- a/net/netfilter/ipvs/ip_vs_sync.c\n+++ b/net/netfilter/ipvs/ip_vs_sync.c\n@@ -949,6 +949,21 @@ static void ip_vs_proc_conn(struct netns_ipvs ipvs, struct ip_vs_conn_param pa\n \tip_vs_conn_put(cp);\n }\n \n+/* Check for incompatible flags /\n+static bool ip_vs_sync_validate_flags(u32 flags)\n+{\n+\t/ We do not expect NO_CPORT, especially to allow lookups\n+\t * to hit templates\n+\t /\n+\tif (flags \u0026 IP_VS_CONN_F_NO_CPORT) {\n+\t\tif (flags \u0026 IP_VS_CONN_F_TEMPLATE)\n+\t\t\treturn false;\n+\t}\n+\tif (flags \u0026 IP_VS_CONN_F_ONE_PACKET)\n+\t\treturn false;\n+\treturn true;\n+}\n+\n /\n * Process received multicast message for Version 0\n /\n@@ -972,8 +987,7 @@ static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer\n \t\t\treturn;\n \t\t}\n \t\ts = (struct ip_vs_sync_conn_v0 ) p;\n-\t\tflags = ntohs(s-\u003eflags) \| IP_VS_CONN_F_SYNC;\n-\t\tflags \u0026= ~IP_VS_CONN_F_HASHED;\n+\t\tflags = ntohs(s-\u003eflags);\n \t\tif (flags \u0026 IP_VS_CONN_F_SEQ_MASK) {\n \t\t\topt = (struct ip_vs_sync_conn_options )\u0026s[1];\n \t\t\tp += FULL_CONN_SIZE;\n@@ -986,6 +1000,13 @@ static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer\n \t\t\tp += SIMPLE_CONN_SIZE;\n \t\t}\n \n+\t\tif (!ip_vs_sync_validate_flags(flags)) {\n+\t\t\tIP_VS_DBG(2, \"BACKUP v0, Invalid flags 0x%X\\n\", flags);\n+\t\t\tcontinue;\n+\t\t}\n+\t\tflags \u0026= IP_VS_CONN_F_BACKUP_MASK;\n+\t\tflags \|= IP_VS_CONN_F_SYNC;\n+\n \t\tstate = ntohs(s-\u003estate);\n \t\tif (!(flags \u0026 IP_VS_CONN_F_TEMPLATE)) {\n \t\t\tpp = ip_vs_proto_get(s-\u003eprotocol);\n@@ -1141,7 +1162,13 @@ static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 m\n \t}\n \n \t/* Get flags and Mask off unsupported */\n-\tflags = ntohl(s-\u003ev4.flags) \u0026 IP_VS_CONN_F_BACKUP_MASK;\n+\tflags = ntohl(s-\u003ev4.flags);\n+\tif (!ip_vs_sync_validate_flags(flags)) {\n+\t\tIP_VS_DBG(3, \"BACKUP, Invalid flags 0x%X\\n\", flags);\n+\t\tretc = 25;\n+\t\tgoto out;\n+\t}\n+\tflags \u0026= IP_VS_CONN_F_BACKUP_MASK;\n \tflags \|= IP_VS_CONN_F_SYNC;\n \tstate = ntohs(s-\u003ev4.state);\n \n" }
2/1	2026/09/11 18:46	agent	patch-evaluator	1m Model: core Args: null Results: { "EnableConfigs": [ "IP_VS", "NETFILTER", "INET" ], "FocusSymbols": [ "ip_vs_sync_validate_flags", "ip_vs_process_message_v0", "ip_vs_proc_sync_conn", "ip_vs_process_message", "sync_thread_backup", "start_sync_thread" ], "Reasoning": "The patch introduces flag validation (ip_vs_sync_validate_flags) and proper masking when parsing incoming IPVS sync messages in the backup daemon, rejecting incompatible flags such as IP_VS_CONN_F_NO_CPORT with IP_VS_CONN_F_TEMPLATE or IP_VS_CONN_F_ONE_PACKET in both v0 and v1 message formats. This modifies reachable network protocol processing in netfilter/IPVS and warrants fuzzing.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer and security engineer. Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on internal assumptions. You must actively use your code access tools to inspect the actual source code, callers, and surrounding context. ================================================================================ 1. CORE TRIAGE PHILOSOPHY ================================================================================ The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs, and newly triggered assertions introduced by the patch series. - REACHABILITY IS THE PRIMARY GATE: Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap). If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed, regardless of whether it adds assertions or complex logic. - DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS: Patch authors routinely label changes as "cleanups", "refactorings", or state "No functional change intended". Do NOT take these claims at face value. Code refactorings that rearrange logic, introduce helper functions, or alter state management in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs. If reachable executable code is modified or refactored, it MUST be fuzzed. - NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED: When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON, VM_WARN_ON, BUG_ON, lockdep_assert) in reachable code paths, it enforces new or stricter invariants. Even if the author believes the invariant always holds, fuzzing is essential to verify whether an unusual sequence of operations can violate it. ================================================================================ 2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA) ================================================================================ Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: - Non-kernel and non-executable changes: * Modifications to Documentation/, comments, or spelling fixes. * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/) that do not affect the compiled kernel image (vmlinux) or kernel modules. * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints that do not alter control flow or data structures. * Build system or Kconfig changes that do not alter compiled C logic. - Structurally unreachable hardware: * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU. - Unreachable execution paths: * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding. * Code paths exclusive to architectures other than the target architecture. ================================================================================ 3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA) ================================================================================ Return WorthFuzzing=true whenever the patch touches reachable executable code, including: - Core Subsystems: * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/), BPF, scheduler, core networking, VFS, or syscall handling. - Refactorings and Code Cleanups: * Any restructuring of reachable data structures, helper abstractions, or algorithm flows. - Runtime Assertions and Defensive Checks: * Any introduction or alteration of assertions (WARN_ON, VM_WARN_ON, BUG_ON, etc.) in reachable paths. - Reachable Drivers and Protocols: Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.). ================================================================================ 4. EXTRACTING FocusSymbols (PREVENTING DILUTION) ================================================================================ When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer: - AVOID UBIQUITOUS LIFECYCLE HOT-PATHS: Do NOT list generic, ubiquitous functions called by almost every program in the corpus (including, but not limited to: general memory allocators and deallocators, page fault and trap handlers, or core synchronization primitives; this is not an exhaustive list). Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused", which severely dilutes fuzzing effort away from the actual changes. - TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS: List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review. - HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h): Compiler-inlined static functions (such as static inlines in mm/.h or include/linux/.h) lack distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters. If the changes are primarily in static inline helpers, identify non-static, feature-specific caller functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers). ================================================================================ 5. IDENTIFYING EnableConfigs ================================================================================ Identify any specific CONFIG_ options required to properly compile and reach the modified code: - Inspect Kconfig files and #ifdef guards; do not make assumptions. - Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed. - Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit 6f726991e6af6971311a0a00692b0a1bb1c2393d Author: syz-cluster <triage@syzkaller.com> Date: Fri Sep 11 18:46:36 2026 +0000 syz-cluster: applied patch under review diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c index 5383aeafb0aed..69dc28153ec12 100644 --- a/net/netfilter/ipvs/ip_vs_sync.c +++ b/net/netfilter/ipvs/ip_vs_sync.c @@ -949,6 +949,21 @@ static void ip_vs_proc_conn(struct netns_ipvs ipvs, struct ip_vs_conn_param pa ip_vs_conn_put(cp); } +/* Check for incompatible flags / +static bool ip_vs_sync_validate_flags(u32 flags) +{ + / We do not expect NO_CPORT, especially to allow lookups + * to hit templates + / + if (flags & IP_VS_CONN_F_NO_CPORT) { + if (flags & IP_VS_CONN_F_TEMPLATE) + return false; + } + if (flags & IP_VS_CONN_F_ONE_PACKET) + return false; + return true; +} + / * Process received multicast message for Version 0 / @@ -972,8 +987,7 @@ static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer return; } s = (struct ip_vs_sync_conn_v0 ) p; - flags = ntohs(s->flags) \| IP_VS_CONN_F_SYNC; - flags &= ~IP_VS_CONN_F_HASHED; + flags = ntohs(s->flags); if (flags & IP_VS_CONN_F_SEQ_MASK) { opt = (struct ip_vs_sync_conn_options )&s[1]; p += FULL_CONN_SIZE; @@ -986,6 +1000,13 @@ static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer p += SIMPLE_CONN_SIZE; } + if (!ip_vs_sync_validate_flags(flags)) { + IP_VS_DBG(2, "BACKUP v0, Invalid flags 0x%X\n", flags); + continue; + } + flags &= IP_VS_CONN_F_BACKUP_MASK; + flags \|= IP_VS_CONN_F_SYNC; + state = ntohs(s->state); if (!(flags & IP_VS_CONN_F_TEMPLATE)) { pp = ip_vs_proto_get(s->protocol); @@ -1141,7 +1162,13 @@ static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 m } /* Get flags and Mask off unsupported */ - flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK; + flags = ntohl(s->v4.flags); + if (!ip_vs_sync_validate_flags(flags)) { + IP_VS_DBG(3, "BACKUP, Invalid flags 0x%X\n", flags); + retc = 25; + goto out; + } + flags &= IP_VS_CONN_F_BACKUP_MASK; flags \|= IP_VS_CONN_F_SYNC; state = ntohs(s->v4.state);
3/2	2026/09/11 18:46	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 3597 output: 32 thoughts: 130 Thoughts: Analyzing the IPVS Synchronization Patch Okay, let's dive in. First, I need to get a handle on what this patch is actually changing and the context. From the description, it seems we're looking at a modification to `net/netfilter/ipvs/ip_vs_sync.c`. So, that's where the core of the synchronization logic resides. I'll need to understand how the changes impact the existing synchronization process. The listed functions are the key here: `ip_vs_sync_validate_flags`, which appears to be a new helper, `ip_vs_process_message_v0`, and `ip_vs_proc_sync_conn`. It looks like we've got a new validation step, likely related to the flags being synchronized, and then handling the messages themselves, and finally the actual synchronization. I'm going to start with a deep dive into `net/netfilter/ipvs/ip_vs_sync.c` using `read-file` or `grepper` – whatever's quickest – to get a feel for the surrounding code and understand the control flow around these functions. I need to see how these functions are called, the data structures they interact with, and what potential side effects exist. Finally, I'll need to check the Kconfig file for the IPVS synchronization daemon itself. I'm assuming changes here might relate to features or dependencies. It’s also possible the new helper has introduced some configuration options, and I will need to understand what's newly configurable. This will ensure I understand how this patch fits into the overall IPVS landscape and any configuration changes. This is important to ensure it's properly handled in any configuration.
4/2	2026/09/11 18:46	tool	grepper	0m Args: { "Expression": "ip_vs_sync", "PathPrefix": "net/netfilter/ipvs" } Results: { "Output": "net/netfilter/ipvs/Makefile=16=ip_vs-objs :=\tip_vs_conn.o ip_vs_core.o ip_vs_ctl.o ip_vs_sched.o\t \\\nnet/netfilter/ipvs/Makefile:17:\t\tip_vs_xmit.o ip_vs_app.o ip_vs_sync.o\t \t\t \\\nnet/netfilter/ipvs/Makefile-18-\t\tip_vs_est.o ip_vs_proto.o ip_vs_pe.o\t\t\t \\\n--\nnet/netfilter/ipvs/ip_vs_conn.c=1347=static void ip_vs_conn_expire(struct timer_list t)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1416-\tif (ipvs-\u003esync_state \u0026 IP_VS_STATE_MASTER)\nnet/netfilter/ipvs/ip_vs_conn.c:1417:\t\tip_vs_sync_conn(ipvs, cp, sysctl_sync_threshold(ipvs));\nnet/netfilter/ipvs/ip_vs_conn.c-1418-\n--\nnet/netfilter/ipvs/ip_vs_core.c=2096=ip_vs_in_hook(void priv, struct sk_buff skb, const struct nf_hook_state state)\n--\nnet/netfilter/ipvs/ip_vs_core.c-2266-\t \nnet/netfilter/ipvs/ip_vs_core.c:2267:\t For ONE_PKT let ip_vs_sync_conn() do the filter work.\nnet/netfilter/ipvs/ip_vs_core.c-2268-\t /\n--\nnet/netfilter/ipvs/ip_vs_core.c-2275-\tif (ipvs-\u003esync_state \u0026 IP_VS_STATE_MASTER)\nnet/netfilter/ipvs/ip_vs_core.c:2276:\t\tip_vs_sync_conn(ipvs, cp, pkts);\nnet/netfilter/ipvs/ip_vs_core.c-2277-\telse if ((cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET) \u0026\u0026 cp-\u003econtrol)\nnet/netfilter/ipvs/ip_vs_core.c:2278:\t\t/ increment is done inside ip_vs_sync_conn too /\nnet/netfilter/ipvs/ip_vs_core.c-2279-\t\tatomic_inc(\u0026cp-\u003econtrol-\u003ein_pkts);\n--\nnet/netfilter/ipvs/ip_vs_core.c=2480=static int __net_init __ip_vs_init(struct net net)\n--\nnet/netfilter/ipvs/ip_vs_core.c-2510-\nnet/netfilter/ipvs/ip_vs_core.c:2511:\tif (ip_vs_sync_net_init(ipvs) \u003c 0)\nnet/netfilter/ipvs/ip_vs_core.c-2512-\t\tgoto sync_fail;\n--\nnet/netfilter/ipvs/ip_vs_core.c=2552=static void __net_exit __ip_vs_dev_cleanup_batch(struct list_head net_list)\n--\nnet/netfilter/ipvs/ip_vs_core.c-2562-\t\tsmp_wmb();\nnet/netfilter/ipvs/ip_vs_core.c:2563:\t\tip_vs_sync_net_cleanup(ipvs);\nnet/netfilter/ipvs/ip_vs_core.c-2564-\t}\n--\nnet/netfilter/ipvs/ip_vs_sync.c-13- time-outs, and firewall marks.\nnet/netfilter/ipvs/ip_vs_sync.c:14: * In ver.1 \"ip_vs_sync_conn_options\" will be sent in netw. order.\nnet/netfilter/ipvs/ip_vs_sync.c-15- * Ver. 0 can be turned on by sysctl -w net.ipv4.vs.sync_version=0\n--\nnet/netfilter/ipvs/ip_vs_sync.c-22- \nnet/netfilter/ipvs/ip_vs_sync.c:23: ip_vs_sync: sync connection info from master load balancer to backups\nnet/netfilter/ipvs/ip_vs_sync.c-24- * through multicast\n--\nnet/netfilter/ipvs/ip_vs_sync.c=65=static struct lock_class_key __ipvs_sync_key;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-69- /\nnet/netfilter/ipvs/ip_vs_sync.c:70:struct ip_vs_sync_conn_v0 {\nnet/netfilter/ipvs/ip_vs_sync.c-71-\t__u8\t\t\treserved;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-88-\nnet/netfilter/ipvs/ip_vs_sync.c:89:struct ip_vs_sync_conn_options {\nnet/netfilter/ipvs/ip_vs_sync.c-90-\tstruct ip_vs_seq in_seq; / incoming seq. struct /\n--\nnet/netfilter/ipvs/ip_vs_sync.c-131- /\nnet/netfilter/ipvs/ip_vs_sync.c:132:struct ip_vs_sync_v4 {\nnet/netfilter/ipvs/ip_vs_sync.c-133-\t__u8\t\t\ttype;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-153- /\nnet/netfilter/ipvs/ip_vs_sync.c:154:struct ip_vs_sync_v6 {\nnet/netfilter/ipvs/ip_vs_sync.c-155-\t__u8\t\t\ttype;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-173-\nnet/netfilter/ipvs/ip_vs_sync.c:174:union ip_vs_sync_conn {\nnet/netfilter/ipvs/ip_vs_sync.c:175:\tstruct ip_vs_sync_v4\tv4;\nnet/netfilter/ipvs/ip_vs_sync.c:176:\tstruct ip_vs_sync_v6\tv6;\nnet/netfilter/ipvs/ip_vs_sync.c-177-};\n--\nnet/netfilter/ipvs/ip_vs_sync.c-195-\nnet/netfilter/ipvs/ip_vs_sync.c:196:struct ip_vs_sync_thread_data {\nnet/netfilter/ipvs/ip_vs_sync.c-197-\tstruct task_struct task;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-204-/* Version 0 definition of packet sizes /\nnet/netfilter/ipvs/ip_vs_sync.c:205:#define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn_v0))\nnet/netfilter/ipvs/ip_vs_sync.c-206-#define FULL_CONN_SIZE \\\nnet/netfilter/ipvs/ip_vs_sync.c:207:(sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options))\nnet/netfilter/ipvs/ip_vs_sync.c-208-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-244-/ Version 0 header /\nnet/netfilter/ipvs/ip_vs_sync.c:245:struct ip_vs_sync_mesg_v0 {\nnet/netfilter/ipvs/ip_vs_sync.c-246-\t__u8 nr_conns;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-249-\nnet/netfilter/ipvs/ip_vs_sync.c:250:\t/ ip_vs_sync_conn entries start here /\nnet/netfilter/ipvs/ip_vs_sync.c-251-};\n--\nnet/netfilter/ipvs/ip_vs_sync.c-253-/ Version 1 header /\nnet/netfilter/ipvs/ip_vs_sync.c:254:struct ip_vs_sync_mesg {\nnet/netfilter/ipvs/ip_vs_sync.c-255-\t__u8\t\t\treserved;\t/ must be zero /\n--\nnet/netfilter/ipvs/ip_vs_sync.c-260-\t__u16\t\t\tspare;\nnet/netfilter/ipvs/ip_vs_sync.c:261:\t/ ip_vs_sync_conn entries start here /\nnet/netfilter/ipvs/ip_vs_sync.c-262-};\n--\nnet/netfilter/ipvs/ip_vs_sync.c=264=union ipvs_sockaddr {\n--\nnet/netfilter/ipvs/ip_vs_sync.c-268-\nnet/netfilter/ipvs/ip_vs_sync.c:269:struct ip_vs_sync_buff {\nnet/netfilter/ipvs/ip_vs_sync.c-270-\tstruct list_head list;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-273-\t/ pointers for the message data /\nnet/netfilter/ipvs/ip_vs_sync.c:274:\tstruct ip_vs_sync_mesg mesg;\nnet/netfilter/ipvs/ip_vs_sync.c-275-\tunsigned char head;\n--\nnet/netfilter/ipvs/ip_vs_sync.c=295=static void hton_seq(struct ip_vs_seq ho, struct ip_vs_seq no)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-301-\nnet/netfilter/ipvs/ip_vs_sync.c:302:static inline struct ip_vs_sync_buff \nnet/netfilter/ipvs/ip_vs_sync.c-303-sb_dequeue(struct netns_ipvs ipvs, struct ipvs_master_sync_state ms)\nnet/netfilter/ipvs/ip_vs_sync.c-304-{\nnet/netfilter/ipvs/ip_vs_sync.c:305:\tstruct ip_vs_sync_buff sb;\nnet/netfilter/ipvs/ip_vs_sync.c-306-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-311-\t} else {\nnet/netfilter/ipvs/ip_vs_sync.c:312:\t\tsb = list_entry(ms-\u003esync_queue.next, struct ip_vs_sync_buff,\nnet/netfilter/ipvs/ip_vs_sync.c-313-\t\t\t\tlist);\n--\nnet/netfilter/ipvs/ip_vs_sync.c-326- /\nnet/netfilter/ipvs/ip_vs_sync.c:327:static inline struct ip_vs_sync_buff \nnet/netfilter/ipvs/ip_vs_sync.c:328:ip_vs_sync_buff_create(struct netns_ipvs ipvs, unsigned int len)\nnet/netfilter/ipvs/ip_vs_sync.c-329-{\nnet/netfilter/ipvs/ip_vs_sync.c:330:\tstruct ip_vs_sync_buff sb;\nnet/netfilter/ipvs/ip_vs_sync.c-331-\nnet/netfilter/ipvs/ip_vs_sync.c:332:\tif (!(sb=kmalloc_obj(struct ip_vs_sync_buff, GFP_ATOMIC)))\nnet/netfilter/ipvs/ip_vs_sync.c-333-\t\treturn NULL;\nnet/netfilter/ipvs/ip_vs_sync.c-334-\nnet/netfilter/ipvs/ip_vs_sync.c:335:\tlen = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg),\nnet/netfilter/ipvs/ip_vs_sync.c-336-\t\t ipvs-\u003emcfg.sync_maxlen);\n--\nnet/netfilter/ipvs/ip_vs_sync.c-344-\tsb-\u003emesg-\u003esyncid = ipvs-\u003emcfg.syncid;\nnet/netfilter/ipvs/ip_vs_sync.c:345:\tsb-\u003emesg-\u003esize = htons(sizeof(struct ip_vs_sync_mesg));\nnet/netfilter/ipvs/ip_vs_sync.c-346-\tsb-\u003emesg-\u003enr_conns = 0;\nnet/netfilter/ipvs/ip_vs_sync.c-347-\tsb-\u003emesg-\u003espare = 0;\nnet/netfilter/ipvs/ip_vs_sync.c:348:\tsb-\u003ehead = (unsigned char )sb-\u003emesg + sizeof(struct ip_vs_sync_mesg);\nnet/netfilter/ipvs/ip_vs_sync.c-349-\tsb-\u003eend = (unsigned char )sb-\u003emesg + len;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-354-\nnet/netfilter/ipvs/ip_vs_sync.c:355:static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff sb)\nnet/netfilter/ipvs/ip_vs_sync.c-356-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=361=static inline void sb_queue_tail(struct netns_ipvs ipvs,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-363-{\nnet/netfilter/ipvs/ip_vs_sync.c:364:\tstruct ip_vs_sync_buff sb = ms-\u003esync_buff;\nnet/netfilter/ipvs/ip_vs_sync.c-365-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-379-\t} else\nnet/netfilter/ipvs/ip_vs_sync.c:380:\t\tip_vs_sync_buff_release(sb);\nnet/netfilter/ipvs/ip_vs_sync.c-381-\tspin_unlock(\u0026ipvs-\u003esync_lock);\n--\nnet/netfilter/ipvs/ip_vs_sync.c-387- /\nnet/netfilter/ipvs/ip_vs_sync.c:388:static inline struct ip_vs_sync_buff \nnet/netfilter/ipvs/ip_vs_sync.c-389-get_curr_sync_buff(struct netns_ipvs ipvs, struct ipvs_master_sync_state ms,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-391-{\nnet/netfilter/ipvs/ip_vs_sync.c:392:\tstruct ip_vs_sync_buff sb;\nnet/netfilter/ipvs/ip_vs_sync.c-393-\n--\nnet/netfilter/ipvs/ip_vs_sync.c=406=select_master_thread_id(struct netns_ipvs ipvs, struct ip_vs_conn cp)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-413- /\nnet/netfilter/ipvs/ip_vs_sync.c:414:static inline struct ip_vs_sync_buff \nnet/netfilter/ipvs/ip_vs_sync.c:415:ip_vs_sync_buff_create_v0(struct netns_ipvs ipvs, unsigned int len)\nnet/netfilter/ipvs/ip_vs_sync.c-416-{\nnet/netfilter/ipvs/ip_vs_sync.c:417:\tstruct ip_vs_sync_buff sb;\nnet/netfilter/ipvs/ip_vs_sync.c:418:\tstruct ip_vs_sync_mesg_v0 mesg;\nnet/netfilter/ipvs/ip_vs_sync.c-419-\nnet/netfilter/ipvs/ip_vs_sync.c:420:\tif (!(sb=kmalloc_obj(struct ip_vs_sync_buff, GFP_ATOMIC)))\nnet/netfilter/ipvs/ip_vs_sync.c-421-\t\treturn NULL;\nnet/netfilter/ipvs/ip_vs_sync.c-422-\nnet/netfilter/ipvs/ip_vs_sync.c:423:\tlen = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg_v0),\nnet/netfilter/ipvs/ip_vs_sync.c-424-\t\t ipvs-\u003emcfg.sync_maxlen);\n--\nnet/netfilter/ipvs/ip_vs_sync.c-429-\t}\nnet/netfilter/ipvs/ip_vs_sync.c:430:\tmesg = (struct ip_vs_sync_mesg_v0 )sb-\u003emesg;\nnet/netfilter/ipvs/ip_vs_sync.c-431-\tmesg-\u003enr_conns = 0;\nnet/netfilter/ipvs/ip_vs_sync.c-432-\tmesg-\u003esyncid = ipvs-\u003emcfg.syncid;\nnet/netfilter/ipvs/ip_vs_sync.c:433:\tmesg-\u003esize = htons(sizeof(struct ip_vs_sync_mesg_v0));\nnet/netfilter/ipvs/ip_vs_sync.c:434:\tsb-\u003ehead = (unsigned char )mesg + sizeof(struct ip_vs_sync_mesg_v0);\nnet/netfilter/ipvs/ip_vs_sync.c-435-\tsb-\u003eend = (unsigned char )mesg + len;\n--\nnet/netfilter/ipvs/ip_vs_sync.c=441=static inline bool in_persistence(struct ip_vs_conn cp)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-458- /\nnet/netfilter/ipvs/ip_vs_sync.c:459:static int ip_vs_sync_conn_needed(struct netns_ipvs ipvs,\nnet/netfilter/ipvs/ip_vs_sync.c-460-\t\t\t\t struct ip_vs_conn cp, int pkts)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-538- /\nnet/netfilter/ipvs/ip_vs_sync.c:539:static void ip_vs_sync_conn_v0(struct netns_ipvs ipvs, struct ip_vs_conn cp,\nnet/netfilter/ipvs/ip_vs_sync.c-540-\t\t\t int pkts)\nnet/netfilter/ipvs/ip_vs_sync.c-541-{\nnet/netfilter/ipvs/ip_vs_sync.c:542:\tstruct ip_vs_sync_mesg_v0 m;\nnet/netfilter/ipvs/ip_vs_sync.c:543:\tstruct ip_vs_sync_conn_v0 s;\nnet/netfilter/ipvs/ip_vs_sync.c:544:\tstruct ip_vs_sync_buff buff;\nnet/netfilter/ipvs/ip_vs_sync.c-545-\tstruct ipvs_master_sync_state ms;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-554-\nnet/netfilter/ipvs/ip_vs_sync.c:555:\tif (!ip_vs_sync_conn_needed(ipvs, cp, pkts))\nnet/netfilter/ipvs/ip_vs_sync.c-556-\t\treturn;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-569-\tif (buff) {\nnet/netfilter/ipvs/ip_vs_sync.c:570:\t\tm = (struct ip_vs_sync_mesg_v0 ) buff-\u003emesg;\nnet/netfilter/ipvs/ip_vs_sync.c-571-\t\t/ Send buffer if it is for v1 /\n--\nnet/netfilter/ipvs/ip_vs_sync.c-578-\tif (!buff) {\nnet/netfilter/ipvs/ip_vs_sync.c:579:\t\tbuff = ip_vs_sync_buff_create_v0(ipvs, len);\nnet/netfilter/ipvs/ip_vs_sync.c-580-\t\tif (!buff) {\nnet/netfilter/ipvs/ip_vs_sync.c-581-\t\t\tspin_unlock_bh(\u0026ipvs-\u003esync_buff_lock);\nnet/netfilter/ipvs/ip_vs_sync.c:582:\t\t\tpr_err(\"ip_vs_sync_buff_create failed.\\n\");\nnet/netfilter/ipvs/ip_vs_sync.c-583-\t\t\treturn;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-587-\nnet/netfilter/ipvs/ip_vs_sync.c:588:\tm = (struct ip_vs_sync_mesg_v0 ) buff-\u003emesg;\nnet/netfilter/ipvs/ip_vs_sync.c:589:\ts = (struct ip_vs_sync_conn_v0 ) buff-\u003ehead;\nnet/netfilter/ipvs/ip_vs_sync.c-590-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-602-\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_SEQ_MASK) {\nnet/netfilter/ipvs/ip_vs_sync.c:603:\t\tstruct ip_vs_sync_conn_options opt =\nnet/netfilter/ipvs/ip_vs_sync.c:604:\t\t\t(struct ip_vs_sync_conn_options )\u0026s[1];\nnet/netfilter/ipvs/ip_vs_sync.c-605-\t\tmemcpy(opt, \u0026cp-\u003esync_conn_opt, sizeof(opt));\n--\nnet/netfilter/ipvs/ip_vs_sync.c-619-\t\t\tpkts = sysctl_sync_threshold(ipvs);\nnet/netfilter/ipvs/ip_vs_sync.c:620:\t\tip_vs_sync_conn(ipvs, cp, pkts);\nnet/netfilter/ipvs/ip_vs_sync.c-621-\t}\n--\nnet/netfilter/ipvs/ip_vs_sync.c-628- /\nnet/netfilter/ipvs/ip_vs_sync.c:629:void ip_vs_sync_conn(struct netns_ipvs ipvs, struct ip_vs_conn cp, int pkts)\nnet/netfilter/ipvs/ip_vs_sync.c-630-{\nnet/netfilter/ipvs/ip_vs_sync.c:631:\tstruct ip_vs_sync_mesg m;\nnet/netfilter/ipvs/ip_vs_sync.c:632:\tunion ip_vs_sync_conn s;\nnet/netfilter/ipvs/ip_vs_sync.c:633:\tstruct ip_vs_sync_buff buff;\nnet/netfilter/ipvs/ip_vs_sync.c-634-\tstruct ipvs_master_sync_state ms;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-640-\tif (sysctl_sync_ver(ipvs) == 0) {\nnet/netfilter/ipvs/ip_vs_sync.c:641:\t\tip_vs_sync_conn_v0(ipvs, cp, pkts);\nnet/netfilter/ipvs/ip_vs_sync.c-642-\t\treturn;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-647-sloop:\nnet/netfilter/ipvs/ip_vs_sync.c:648:\tif (!ip_vs_sync_conn_needed(ipvs, cp, pkts))\nnet/netfilter/ipvs/ip_vs_sync.c-649-\t\tgoto control;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-671-\tif (cp-\u003eaf == AF_INET6)\nnet/netfilter/ipvs/ip_vs_sync.c:672:\t\tlen = sizeof(struct ip_vs_sync_v6);\nnet/netfilter/ipvs/ip_vs_sync.c-673-\telse\nnet/netfilter/ipvs/ip_vs_sync.c-674-#endif\nnet/netfilter/ipvs/ip_vs_sync.c:675:\t\tlen = sizeof(struct ip_vs_sync_v4);\nnet/netfilter/ipvs/ip_vs_sync.c-676-\nnet/netfilter/ipvs/ip_vs_sync.c-677-\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_SEQ_MASK)\nnet/netfilter/ipvs/ip_vs_sync.c:678:\t\tlen += sizeof(struct ip_vs_sync_conn_options) + 2;\nnet/netfilter/ipvs/ip_vs_sync.c-679-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-700-\tif (!buff) {\nnet/netfilter/ipvs/ip_vs_sync.c:701:\t\tbuff = ip_vs_sync_buff_create(ipvs, len);\nnet/netfilter/ipvs/ip_vs_sync.c-702-\t\tif (!buff) {\nnet/netfilter/ipvs/ip_vs_sync.c-703-\t\t\tspin_unlock_bh(\u0026ipvs-\u003esync_buff_lock);\nnet/netfilter/ipvs/ip_vs_sync.c:704:\t\t\tpr_err(\"ip_vs_sync_buff_create failed.\\n\");\nnet/netfilter/ipvs/ip_vs_sync.c-705-\t\t\treturn;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-717-\nnet/netfilter/ipvs/ip_vs_sync.c:718:\ts = (union ip_vs_sync_conn )p;\nnet/netfilter/ipvs/ip_vs_sync.c-719-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-734-\tif (cp-\u003eaf == AF_INET6) {\nnet/netfilter/ipvs/ip_vs_sync.c:735:\t\tp += sizeof(struct ip_vs_sync_v6);\nnet/netfilter/ipvs/ip_vs_sync.c-736-\t\ts-\u003ev6.caddr = cp-\u003ecaddr.in6;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-741-\t{\nnet/netfilter/ipvs/ip_vs_sync.c:742:\t\tp += sizeof(struct ip_vs_sync_v4);\t/* options ptr /\nnet/netfilter/ipvs/ip_vs_sync.c-743-\t\ts-\u003ev4.caddr = cp-\u003ecaddr.ip;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-748-\t\t(p++) = IPVS_OPT_SEQ_DATA;\nnet/netfilter/ipvs/ip_vs_sync.c:749:\t\t(p++) = sizeof(struct ip_vs_sync_conn_options);\nnet/netfilter/ipvs/ip_vs_sync.c-750-\t\thton_seq(\u0026cp-\u003ein_seq, (struct ip_vs_seq )p);\n--\nnet/netfilter/ipvs/ip_vs_sync.c=787=static inline int\nnet/netfilter/ipvs/ip_vs_sync.c:788:ip_vs_conn_fill_param_sync(struct netns_ipvs ipvs, int af, union ip_vs_sync_conn sc,\nnet/netfilter/ipvs/ip_vs_sync.c-789-\t\t\t struct ip_vs_conn_param p,\n--\nnet/netfilter/ipvs/ip_vs_sync.c=841=static void ip_vs_proc_conn(struct netns_ipvs ipvs, struct ip_vs_conn_param param,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-845-\t\t\t unsigned long timeout, __u32 fwmark,\nnet/netfilter/ipvs/ip_vs_sync.c:846:\t\t\t struct ip_vs_sync_conn_options opt)\nnet/netfilter/ipvs/ip_vs_sync.c-847-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-952-/* Check for incompatible flags /\nnet/netfilter/ipvs/ip_vs_sync.c:953:static bool ip_vs_sync_validate_flags(u32 flags)\nnet/netfilter/ipvs/ip_vs_sync.c-954-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=970=static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-972-{\nnet/netfilter/ipvs/ip_vs_sync.c:973:\tstruct ip_vs_sync_mesg_v0 m = (struct ip_vs_sync_mesg_v0 )buffer;\nnet/netfilter/ipvs/ip_vs_sync.c:974:\tstruct ip_vs_sync_conn_v0 s;\nnet/netfilter/ipvs/ip_vs_sync.c:975:\tstruct ip_vs_sync_conn_options opt;\nnet/netfilter/ipvs/ip_vs_sync.c-976-\tstruct ip_vs_protocol pp;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-980-\nnet/netfilter/ipvs/ip_vs_sync.c:981:\tp = (char )buffer + sizeof(struct ip_vs_sync_mesg_v0);\nnet/netfilter/ipvs/ip_vs_sync.c-982-\tfor (i=0; i\u003cm-\u003enr_conns; i++) {\n--\nnet/netfilter/ipvs/ip_vs_sync.c-988-\t\t}\nnet/netfilter/ipvs/ip_vs_sync.c:989:\t\ts = (struct ip_vs_sync_conn_v0 ) p;\nnet/netfilter/ipvs/ip_vs_sync.c-990-\t\tflags = ntohs(s-\u003eflags);\nnet/netfilter/ipvs/ip_vs_sync.c-991-\t\tif (flags \u0026 IP_VS_CONN_F_SEQ_MASK) {\nnet/netfilter/ipvs/ip_vs_sync.c:992:\t\t\topt = (struct ip_vs_sync_conn_options )\u0026s[1];\nnet/netfilter/ipvs/ip_vs_sync.c-993-\t\t\tp += FULL_CONN_SIZE;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1002-\nnet/netfilter/ipvs/ip_vs_sync.c:1003:\t\tif (!ip_vs_sync_validate_flags(flags)) {\nnet/netfilter/ipvs/ip_vs_sync.c-1004-\t\t\tIP_VS_DBG(2, \"BACKUP v0, Invalid flags 0x%X\\n\", flags);\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1045=static inline int ip_vs_proc_seqopt(__u8 p, unsigned int plen,\nnet/netfilter/ipvs/ip_vs_sync.c-1046-\t\t\t\t __u32 opt_flags,\nnet/netfilter/ipvs/ip_vs_sync.c:1047:\t\t\t\t struct ip_vs_sync_conn_options opt)\nnet/netfilter/ipvs/ip_vs_sync.c-1048-{\nnet/netfilter/ipvs/ip_vs_sync.c:1049:\tstruct ip_vs_sync_conn_options topt;\nnet/netfilter/ipvs/ip_vs_sync.c-1050-\nnet/netfilter/ipvs/ip_vs_sync.c:1051:\ttopt = (struct ip_vs_sync_conn_options )p;\nnet/netfilter/ipvs/ip_vs_sync.c-1052-\nnet/netfilter/ipvs/ip_vs_sync.c:1053:\tif (plen != sizeof(struct ip_vs_sync_conn_options)) {\nnet/netfilter/ipvs/ip_vs_sync.c-1054-\t\tIP_VS_DBG(2, \"BACKUP, bogus conn options length\\n\");\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1087=static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 msg_end)\nnet/netfilter/ipvs/ip_vs_sync.c-1088-{\nnet/netfilter/ipvs/ip_vs_sync.c:1089:\tstruct ip_vs_sync_conn_options opt;\nnet/netfilter/ipvs/ip_vs_sync.c:1090:\tunion ip_vs_sync_conn s;\nnet/netfilter/ipvs/ip_vs_sync.c-1091-\tstruct ip_vs_protocol pp;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1098-\nnet/netfilter/ipvs/ip_vs_sync.c:1099:\ts = (union ip_vs_sync_conn ) p;\nnet/netfilter/ipvs/ip_vs_sync.c-1100-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1103-\t\taf = AF_INET6;\nnet/netfilter/ipvs/ip_vs_sync.c:1104:\t\tp += sizeof(struct ip_vs_sync_v6);\nnet/netfilter/ipvs/ip_vs_sync.c-1105-#else\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1111-\t\taf = AF_INET;\nnet/netfilter/ipvs/ip_vs_sync.c:1112:\t\tp += sizeof(struct ip_vs_sync_v4);\nnet/netfilter/ipvs/ip_vs_sync.c-1113-\t} else {\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1165-\tflags = ntohl(s-\u003ev4.flags);\nnet/netfilter/ipvs/ip_vs_sync.c:1166:\tif (!ip_vs_sync_validate_flags(flags)) {\nnet/netfilter/ipvs/ip_vs_sync.c-1167-\t\tIP_VS_DBG(3, \"BACKUP, Invalid flags 0x%X\\n\", flags);\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1227=static void ip_vs_process_message(struct netns_ipvs ipvs, __u8 buffer,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1229-{\nnet/netfilter/ipvs/ip_vs_sync.c:1230:\tstruct ip_vs_sync_mesg m2 = (struct ip_vs_sync_mesg )buffer;\nnet/netfilter/ipvs/ip_vs_sync.c-1231-\t__u8 p, msg_end;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1233-\nnet/netfilter/ipvs/ip_vs_sync.c:1234:\tif (buflen \u003c sizeof(struct ip_vs_sync_mesg_v0)) {\nnet/netfilter/ipvs/ip_vs_sync.c-1235-\t\tIP_VS_DBG(2, \"BACKUP, message header too short\\n\");\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1251-\nnet/netfilter/ipvs/ip_vs_sync.c:1252:\t\tmsg_end = buffer + sizeof(struct ip_vs_sync_mesg);\nnet/netfilter/ipvs/ip_vs_sync.c-1253-\t\tnr_conns = m2-\u003enr_conns;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1255-\t\tfor (i=0; i\u003cnr_conns; i++) {\nnet/netfilter/ipvs/ip_vs_sync.c:1256:\t\t\tunion ip_vs_sync_conn s;\nnet/netfilter/ipvs/ip_vs_sync.c-1257-\t\t\tunsigned int size;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1264-\t\t\t}\nnet/netfilter/ipvs/ip_vs_sync.c:1265:\t\t\ts = (union ip_vs_sync_conn )p;\nnet/netfilter/ipvs/ip_vs_sync.c-1266-\t\t\tsize = ntohs(s-\u003ev4.ver_size) \u0026 SVER_MASK;\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1610=static int\nnet/netfilter/ipvs/ip_vs_sync.c:1611:ip_vs_send_sync_msg(struct socket sock, struct ip_vs_sync_mesg msg)\nnet/netfilter/ipvs/ip_vs_sync.c-1612-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1642=static void master_wakeup_work_handler(struct work_struct work)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1660-/ Get next buffer to send /\nnet/netfilter/ipvs/ip_vs_sync.c:1661:static inline struct ip_vs_sync_buff \nnet/netfilter/ipvs/ip_vs_sync.c-1662-next_sync_buff(struct netns_ipvs ipvs, struct ipvs_master_sync_state ms)\nnet/netfilter/ipvs/ip_vs_sync.c-1663-{\nnet/netfilter/ipvs/ip_vs_sync.c:1664:\tstruct ip_vs_sync_buff sb;\nnet/netfilter/ipvs/ip_vs_sync.c-1665-\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1673=static int sync_thread_master(void data)\nnet/netfilter/ipvs/ip_vs_sync.c-1674-{\nnet/netfilter/ipvs/ip_vs_sync.c:1675:\tstruct ip_vs_sync_thread_data tinfo = data;\nnet/netfilter/ipvs/ip_vs_sync.c-1676-\tstruct netns_ipvs ipvs = tinfo-\u003eipvs;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1678-\tstruct sock sk = tinfo-\u003esock-\u003esk;\nnet/netfilter/ipvs/ip_vs_sync.c:1679:\tstruct ip_vs_sync_buff sb;\nnet/netfilter/ipvs/ip_vs_sync.c-1680-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1702-\t\t}\nnet/netfilter/ipvs/ip_vs_sync.c:1703:\t\tip_vs_sync_buff_release(sb);\nnet/netfilter/ipvs/ip_vs_sync.c-1704-\t}\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1708-\tif (sb)\nnet/netfilter/ipvs/ip_vs_sync.c:1709:\t\tip_vs_sync_buff_release(sb);\nnet/netfilter/ipvs/ip_vs_sync.c-1710-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1712-\twhile ((sb = sb_dequeue(ipvs, ms)))\nnet/netfilter/ipvs/ip_vs_sync.c:1713:\t\tip_vs_sync_buff_release(sb);\nnet/netfilter/ipvs/ip_vs_sync.c-1714-\t__set_current_state(TASK_RUNNING);\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1718-\tif (sb)\nnet/netfilter/ipvs/ip_vs_sync.c:1719:\t\tip_vs_sync_buff_release(sb);\nnet/netfilter/ipvs/ip_vs_sync.c-1720-\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1725=static int sync_thread_backup(void data)\nnet/netfilter/ipvs/ip_vs_sync.c-1726-{\nnet/netfilter/ipvs/ip_vs_sync.c:1727:\tstruct ip_vs_sync_thread_data tinfo = data;\nnet/netfilter/ipvs/ip_vs_sync.c-1728-\tstruct netns_ipvs ipvs = tinfo-\u003eipvs;\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1762=int start_sync_thread(struct netns_ipvs ipvs, struct ipvs_sync_daemon_cfg c,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1764-{\nnet/netfilter/ipvs/ip_vs_sync.c:1765:\tstruct ip_vs_sync_thread_data ti = NULL, tinfo;\nnet/netfilter/ipvs/ip_vs_sync.c-1766-\tstruct task_struct task;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1774-\tIP_VS_DBG(7, \"%s(): pid %d\\n\", __func__, task_pid_nr(current));\nnet/netfilter/ipvs/ip_vs_sync.c:1775:\tIP_VS_DBG(7, \"Each ip_vs_sync_conn entry needs %zd bytes\\n\",\nnet/netfilter/ipvs/ip_vs_sync.c:1776:\t\t sizeof(struct ip_vs_sync_conn_v0));\nnet/netfilter/ipvs/ip_vs_sync.c-1777-\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1889-\tresult = -ENOMEM;\nnet/netfilter/ipvs/ip_vs_sync.c:1890:\tti = kzalloc_objs(struct ip_vs_sync_thread_data, count);\nnet/netfilter/ipvs/ip_vs_sync.c-1891-\tif (!ti)\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1978=int stop_sync_thread(struct netns_ipvs ipvs, int state)\nnet/netfilter/ipvs/ip_vs_sync.c-1979-{\nnet/netfilter/ipvs/ip_vs_sync.c:1980:\tstruct ip_vs_sync_thread_data ti, tinfo;\nnet/netfilter/ipvs/ip_vs_sync.c-1981-\tint id;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-2065- /\nnet/netfilter/ipvs/ip_vs_sync.c:2066:int __net_init ip_vs_sync_net_init(struct netns_ipvs ipvs)\nnet/netfilter/ipvs/ip_vs_sync.c-2067-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-2073-\nnet/netfilter/ipvs/ip_vs_sync.c:2074:void ip_vs_sync_net_cleanup(struct netns_ipvs ipvs)\nnet/netfilter/ipvs/ip_vs_sync.c-2075-{\n" }
5/2	2026/09/11 18:46	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 15468 output: 39 thoughts: 17 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Analyzing the Patch's Purpose Right, let's dive in. Before I even think about applying this patch or evaluating its quality, I need to understand why it exists. My first instinct is to use `git show` on the specific commit in question. That's the quickest route to the metadata: the commit message, any related issue IDs, and the diff itself. The commit message should provide a concise problem statement and, ideally, explain the underlying rationale for the fix. I'm hoping to see a clear description of the bug, any relevant performance metrics before and after, or maybe a rationale for a new feature. I'm also looking for a clean, well-formed commit message. It needs to be clear and concise. If it’s unclear, then I may need to dive further to the related ticket or code. Ultimately, I want to form a mental model of the problem space this patch is addressing. Understanding the why is the foundation for properly assessing the how. I can already start thinking about possible edge cases.
6/2	2026/09/11 18:46	tool	grepper	0m Args: { "Expression": "IP_VS_CONN_F_NO_CPORT", "PathPrefix": "net/netfilter/ipvs" } Results: { "Output": "net/netfilter/ipvs/ip_vs_conn.c=367=__ip_vs_conn_in_get(const struct ip_vs_conn_param p)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-395-\t\t\t\t (!p-\u003ecport ^\nnet/netfilter/ipvs/ip_vs_conn.c:396:\t\t\t\t (!(cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT))) \u0026\u0026\nnet/netfilter/ipvs/ip_vs_conn.c-397-\t\t\t\t p-\u003eprotocol == cp-\u003eprotocol) {\n--\nnet/netfilter/ipvs/ip_vs_conn.c=643=void ip_vs_conn_fill_cport(struct ip_vs_conn cp, __be16 cport)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-684-\t\t\tspin_lock_bh(\u0026cp-\u003elock);\nnet/netfilter/ipvs/ip_vs_conn.c:685:\t\t\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT \u0026\u0026 by_me)\nnet/netfilter/ipvs/ip_vs_conn.c-686-\t\t\t\tcp-\u003ecport = 0;\n--\nnet/netfilter/ipvs/ip_vs_conn.c-757-\t/* Fill cport once, even if multiple packets try to do it /\nnet/netfilter/ipvs/ip_vs_conn.c:758:\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT \u0026\u0026 (!cp-\u003ecport \|\| by_me)) {\nnet/netfilter/ipvs/ip_vs_conn.c-759-\t\t/ If we race with resizing make sure cport is set for dir 1 /\n--\nnet/netfilter/ipvs/ip_vs_conn.c-765-\t\t\tatomic_dec(\u0026ipvs-\u003eno_cport_conns[af_id]);\nnet/netfilter/ipvs/ip_vs_conn.c:766:\t\t\tcp-\u003eflags \u0026= ~IP_VS_CONN_F_NO_CPORT;\nnet/netfilter/ipvs/ip_vs_conn.c-767-\t\t}\n--\nnet/netfilter/ipvs/ip_vs_conn.c=875=struct ip_vs_rht ip_vs_conn_tab_alloc(struct netns_ipvs ipvs, int buckets,\n--\nnet/netfilter/ipvs/ip_vs_conn.c-882-\tscounts = clamp(buckets \u003e\u003e 6, 1, 256);\nnet/netfilter/ipvs/ip_vs_conn.c:883:\t/ locks: based on parallel IP_VS_CONN_F_NO_CPORT operations + resize /\nnet/netfilter/ipvs/ip_vs_conn.c-884-\tlocks = clamp(8, 1, scounts);\n--\nnet/netfilter/ipvs/ip_vs_conn.c=1347=static void ip_vs_conn_expire(struct timer_list t)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1394-\t\tip_vs_unbind_dest(cp);\nnet/netfilter/ipvs/ip_vs_conn.c:1395:\t\tif (unlikely(cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT)) {\nnet/netfilter/ipvs/ip_vs_conn.c-1396-\t\t\tint af_id = ip_vs_af_index(cp-\u003eaf);\n--\nnet/netfilter/ipvs/ip_vs_conn.c=1444=ip_vs_conn_new(const struct ip_vs_conn_param p, int dest_af,\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1516-\nnet/netfilter/ipvs/ip_vs_conn.c:1517:\tif (unlikely(flags \u0026 IP_VS_CONN_F_NO_CPORT)) {\nnet/netfilter/ipvs/ip_vs_conn.c-1518-\t\tint af_id = ip_vs_af_index(cp-\u003eaf);\n--\nnet/netfilter/ipvs/ip_vs_ftp.c=254=static int ip_vs_ftp_out(struct ip_vs_app app, struct ip_vs_conn cp,\n--\nnet/netfilter/ipvs/ip_vs_ftp.c-337-\t\tn_cp = ip_vs_conn_new(\u0026p, cp-\u003eaf, \u0026from, port,\nnet/netfilter/ipvs/ip_vs_ftp.c:338:\t\t\t\t IP_VS_CONN_F_NO_CPORT \|\nnet/netfilter/ipvs/ip_vs_ftp.c-339-\t\t\t\t IP_VS_CONN_F_NFCT,\n--\nnet/netfilter/ipvs/ip_vs_sync.c=953=static bool ip_vs_sync_validate_flags(u32 flags)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-957-\t /\nnet/netfilter/ipvs/ip_vs_sync.c:958:\tif (flags \u0026 IP_VS_CONN_F_NO_CPORT) {\nnet/netfilter/ipvs/ip_vs_sync.c-959-\t\tif (flags \u0026 IP_VS_CONN_F_TEMPLATE)\n--\nnet/netfilter/ipvs/ip_vs_xmit.c=787=ip_vs_nat_xmit(struct sk_buff skb, struct ip_vs_conn cp,\n--\nnet/netfilter/ipvs/ip_vs_xmit.c-793-\t/* check if it is a connection of no-client-port /\nnet/netfilter/ipvs/ip_vs_xmit.c:794:\tif (unlikely(cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT)) {\nnet/netfilter/ipvs/ip_vs_xmit.c-795-\t\t__be16 _pt, p;\n--\nnet/netfilter/ipvs/ip_vs_xmit.c=871=ip_vs_nat_xmit_v6(struct sk_buff skb, struct ip_vs_conn cp,\n--\nnet/netfilter/ipvs/ip_vs_xmit.c-877-\t/* check if it is a connection of no-client-port /\nnet/netfilter/ipvs/ip_vs_xmit.c:878:\tif (unlikely(cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT \u0026\u0026 !ipvsh-\u003efragoffs)) {\nnet/netfilter/ipvs/ip_vs_xmit.c-879-\t\t__be16 _pt, p;\n" }
7/2	2026/09/11 18:46	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 17476 output: 43 thoughts: 27 Thoughts: Here's my take on the process, considering I'm an expert: Diving into the IPVS Synchronization Code Okay, so the task at hand is to understand this code, and it looks like we're focused on `net/netfilter/ipvs/ip_vs_sync.c`. That's the heart of how IPVS, the Linux Virtual Server, handles synchronization. Right, time to dig in and get a good understanding of the changes. I'll need to carefully examine the diff. I'll be looking for any clues that suggest issues that need to be addressed in the context that they appear in the file. I will focus on any new features, bug fixes, or performance tweaks. I'll need to pay close attention to the context of the modifications, and how they interact with other parts of the IPVS system. Let's see what we've got!
8/2	2026/09/11 18:46	tool	read-file	0m Args: { "File": "net/netfilter/ipvs/ip_vs_sync.c", "FirstLine": 945, "LineCount": 70 } Results: { "Contents": " 945:\t\t\t\tcp-\u003etimeout = pd-\u003etimeout_table[state];\n 946:\t\t\telse\n 947:\t\t\t\tcp-\u003etimeout = (360HZ);\n 948:\t\t}\n 949:\t\tip_vs_conn_put(cp);\n 950:\t}\n 951:\t\n 952:\t/* Check for incompatible flags /\n 953:\tstatic bool ip_vs_sync_validate_flags(u32 flags)\n 954:\t{\n 955:\t\t/ We do not expect NO_CPORT, especially to allow lookups\n 956:\t\t * to hit templates\n 957:\t\t /\n 958:\t\tif (flags \u0026 IP_VS_CONN_F_NO_CPORT) {\n 959:\t\t\tif (flags \u0026 IP_VS_CONN_F_TEMPLATE)\n 960:\t\t\t\treturn false;\n 961:\t\t}\n 962:\t\tif (flags \u0026 IP_VS_CONN_F_ONE_PACKET)\n 963:\t\t\treturn false;\n 964:\t\treturn true;\n 965:\t}\n 966:\t\n 967:\t/\n 968:\t * Process received multicast message for Version 0\n 969:\t /\n 970:\tstatic void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer,\n 971:\t\t\t\t\t const size_t buflen)\n 972:\t{\n 973:\t\tstruct ip_vs_sync_mesg_v0 m = (struct ip_vs_sync_mesg_v0 )buffer;\n 974:\t\tstruct ip_vs_sync_conn_v0 s;\n 975:\t\tstruct ip_vs_sync_conn_options opt;\n 976:\t\tstruct ip_vs_protocol pp;\n 977:\t\tstruct ip_vs_conn_param param;\n 978:\t\tchar p;\n 979:\t\tint i;\n 980:\t\n 981:\t\tp = (char )buffer + sizeof(struct ip_vs_sync_mesg_v0);\n 982:\t\tfor (i=0; i\u003cm-\u003enr_conns; i++) {\n 983:\t\t\tunsigned int flags, state;\n 984:\t\n 985:\t\t\tif (p + SIMPLE_CONN_SIZE \u003e buffer+buflen) {\n 986:\t\t\t\tIP_VS_ERR_RL(\"BACKUP v0, bogus conn\\n\");\n 987:\t\t\t\treturn;\n 988:\t\t\t}\n 989:\t\t\ts = (struct ip_vs_sync_conn_v0 ) p;\n 990:\t\t\tflags = ntohs(s-\u003eflags);\n 991:\t\t\tif (flags \u0026 IP_VS_CONN_F_SEQ_MASK) {\n 992:\t\t\t\topt = (struct ip_vs_sync_conn_options )\u0026s[1];\n 993:\t\t\t\tp += FULL_CONN_SIZE;\n 994:\t\t\t\tif (p \u003e buffer+buflen) {\n 995:\t\t\t\t\tIP_VS_ERR_RL(\"BACKUP v0, Dropping buffer bogus conn options\\n\");\n 996:\t\t\t\t\treturn;\n 997:\t\t\t\t}\n 998:\t\t\t} else {\n 999:\t\t\t\topt = NULL;\n1000:\t\t\t\tp += SIMPLE_CONN_SIZE;\n1001:\t\t\t}\n1002:\t\n1003:\t\t\tif (!ip_vs_sync_validate_flags(flags)) {\n1004:\t\t\t\tIP_VS_DBG(2, \"BACKUP v0, Invalid flags 0x%X\\n\", flags);\n1005:\t\t\t\tcontinue;\n1006:\t\t\t}\n1007:\t\t\tflags \u0026= IP_VS_CONN_F_BACKUP_MASK;\n1008:\t\t\tflags \|= IP_VS_CONN_F_SYNC;\n1009:\t\n1010:\t\t\tstate = ntohs(s-\u003estate);\n1011:\t\t\tif (!(flags \u0026 IP_VS_CONN_F_TEMPLATE)) {\n1012:\t\t\t\tpp = ip_vs_proto_get(s-\u003eprotocol);\n1013:\t\t\t\tif (!pp) {\n1014:\t\t\t\t\tIP_VS_DBG(2, \"BACKUP v0, Unsupported protocol %u\\n\",\n" }
9/2	2026/09/11 18:46	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 18854 output: 44 thoughts: 30 Thoughts: Here's my analysis of the provided snippet, framed as my own thought process: Diving into the `ip_vs_proc_sync_conn` Function Okay, so we're focusing on some code, specifically around lines 1140 to 1175, and I need to dive into the `ip_vs_proc_sync_conn` function. Given my expertise in this area, my initial thought is likely about the context. What is this function responsible for? "ip_vs" immediately screams "IP Virtual Server," meaning it's highly relevant to load balancing or similar traffic management. The name "sync_conn" suggests it's likely involved in synchronizing connection information, perhaps between different servers in a cluster or different parts of the system dealing with network connections. I expect to see the key elements of connection state synchronization. What data structures are they using? Are they employing any locking mechanisms to ensure data integrity during updates? I'm probably looking for details around the connection's source and destination IP addresses and ports, its current state, timeouts, and any relevant metadata. I'll need to understand how this function fits into the overall connection tracking and synchronization process within the IPVS system, and how it handles potential race conditions or inconsistencies. Is it using any specific protocols for sync, or something custom? Are there performance considerations? I'll be looking for bottlenecks or any obvious optimization opportunities.
10/2	2026/09/11 18:46	tool	read-file	0m Args: { "File": "net/netfilter/ipvs/ip_vs_sync.c", "FirstLine": 1140, "LineCount": 40 } Results: { "Contents": "1140:\t\t\t\t\t\t IP_VS_PEDATA_MAXLEN, \u0026opt_flags,\n1141:\t\t\t\t\t\t IPVS_OPT_F_PE_DATA))\n1142:\t\t\t\t\treturn -60;\n1143:\t\t\t\tbreak;\n1144:\t\n1145:\t\t\tcase IPVS_OPT_PE_NAME:\n1146:\t\t\t\tif (ip_vs_proc_str(p, plen,\u0026pe_name_len, \u0026pe_name,\n1147:\t\t\t\t\t\t IP_VS_PENAME_MAXLEN, \u0026opt_flags,\n1148:\t\t\t\t\t\t IPVS_OPT_F_PE_NAME))\n1149:\t\t\t\t\treturn -70;\n1150:\t\t\t\tbreak;\n1151:\t\n1152:\t\t\tdefault:\n1153:\t\t\t\t/* Param data mandatory ? /\n1154:\t\t\t\tif (!(ptype \u0026 IPVS_OPT_F_PARAM)) {\n1155:\t\t\t\t\tIP_VS_DBG(3, \"BACKUP, Unknown mandatory param %d found\\n\",\n1156:\t\t\t\t\t\t ptype \u0026 ~IPVS_OPT_F_PARAM);\n1157:\t\t\t\t\tretc = 20;\n1158:\t\t\t\t\tgoto out;\n1159:\t\t\t\t}\n1160:\t\t\t}\n1161:\t\t\tp += plen; / Next option /\n1162:\t\t}\n1163:\t\n1164:\t\t/ Get flags and Mask off unsupported */\n1165:\t\tflags = ntohl(s-\u003ev4.flags);\n1166:\t\tif (!ip_vs_sync_validate_flags(flags)) {\n1167:\t\t\tIP_VS_DBG(3, \"BACKUP, Invalid flags 0x%X\\n\", flags);\n1168:\t\t\tretc = 25;\n1169:\t\t\tgoto out;\n1170:\t\t}\n1171:\t\tflags \u0026= IP_VS_CONN_F_BACKUP_MASK;\n1172:\t\tflags \|= IP_VS_CONN_F_SYNC;\n1173:\t\tstate = ntohs(s-\u003ev4.state);\n1174:\t\n1175:\t\tif (!(flags \u0026 IP_VS_CONN_F_TEMPLATE)) {\n1176:\t\t\tpp = ip_vs_proto_get(s-\u003ev4.protocol);\n1177:\t\t\tif (!pp) {\n1178:\t\t\t\tIP_VS_DBG(3,\"BACKUP, Unsupported protocol %u\\n\",\n1179:\t\t\t\t\ts-\u003ev4.protocol);\n" }
11/2	2026/09/11 18:46	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 19876 output: 23 thoughts: 17 Thoughts: Here's a summary of my thinking process, assuming I'm an expert: Understanding the Commit's History Okay, so I need to get a handle on this specific commit. The first thing I'm going to do is reach for `git log`. I want to immediately grasp the surrounding context. What's the narrative around this change? I'm not just looking for what was changed, but why. The commit message is key, of course, but it's often insufficient on its own. I need the full picture: What was the state of the project before this? What other commits were made around the same time? Were there related branches merged? Any relevant pull requests? I'll probably start with a concise log, maybe using `--oneline` to keep it focused. Then, I can expand the commit with `--patch` to go more in-depth. This is about building a mental map of the changes, so I'll be looking for clues in the messages. That's what I want to establish. Then, I can start to think about the content itself.
12/2	2026/09/11 18:47	tool	grepper	0m Args: { "Expression": "ip_vs_sync_validate_flags" } Results: { "Output": "net/netfilter/ipvs/ip_vs_sync.c=841=static void ip_vs_proc_conn(struct netns_ipvs ipvs, struct ip_vs_conn_param param,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-952-/* Check for incompatible flags /\nnet/netfilter/ipvs/ip_vs_sync.c:953:static bool ip_vs_sync_validate_flags(u32 flags)\nnet/netfilter/ipvs/ip_vs_sync.c-954-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=970=static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1002-\nnet/netfilter/ipvs/ip_vs_sync.c:1003:\t\tif (!ip_vs_sync_validate_flags(flags)) {\nnet/netfilter/ipvs/ip_vs_sync.c-1004-\t\t\tIP_VS_DBG(2, \"BACKUP v0, Invalid flags 0x%X\\n\", flags);\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1087=static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 msg_end)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1165-\tflags = ntohl(s-\u003ev4.flags);\nnet/netfilter/ipvs/ip_vs_sync.c:1166:\tif (!ip_vs_sync_validate_flags(flags)) {\nnet/netfilter/ipvs/ip_vs_sync.c-1167-\t\tIP_VS_DBG(3, \"BACKUP, Invalid flags 0x%X\\n\", flags);\n" }
13/2	2026/09/11 18:47	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 20645 output: 33 thoughts: 16 Thoughts: Okay, here's my attempt at summarizing those thoughts from an expert's perspective, using a first-person perspective: Delving into IPVS Configuration Alright, let's get down to brass tacks. I need to refresh my memory on the specific Kconfig options that control the configuration of IPVS (the Linux Virtual Server) and, critically, how its synchronization mechanisms are handled. I know the basic landscape, but I want to make sure I'm not missing any nuances. Are there any new options introduced recently? I need a clear picture of what's available to tune the behavior of the connection tracking and load balancing across the cluster. This is where the devil is in the details; it's always the fine-grained settings that make or break a high-performance, resilient setup. Time to dive into the kernel configuration files and verify what's what.
14/2	2026/09/11 18:47	tool	grepper	0m Args: { "Expression": "IP_VS", "PathPrefix": "net/netfilter/ipvs/Kconfig" } Results: { "Output": "net/netfilter/ipvs/Kconfig-4-#\nnet/netfilter/ipvs/Kconfig:5:menuconfig IP_VS\nnet/netfilter/ipvs/Kconfig-6-\ttristate \"IP virtual server support\"\n--\nnet/netfilter/ipvs/Kconfig-26-\nnet/netfilter/ipvs/Kconfig:27:if IP_VS\nnet/netfilter/ipvs/Kconfig-28-\nnet/netfilter/ipvs/Kconfig:29:config\tIP_VS_IPV6\nnet/netfilter/ipvs/Kconfig-30-\tbool \"IPv6 support for IPVS\"\nnet/netfilter/ipvs/Kconfig:31:\tdepends on IPV6 = y \|\| IP_VS = IPV6\nnet/netfilter/ipvs/Kconfig-32-\tselect NF_DEFRAG_IPV6\n--\nnet/netfilter/ipvs/Kconfig-37-\nnet/netfilter/ipvs/Kconfig:38:config\tIP_VS_DEBUG\nnet/netfilter/ipvs/Kconfig-39-\tbool \"IP virtual server debugging\"\n--\nnet/netfilter/ipvs/Kconfig-44-\nnet/netfilter/ipvs/Kconfig:45:config\tIP_VS_TAB_BITS\nnet/netfilter/ipvs/Kconfig-46-\tint \"IPVS connection table size (the Nth power of 2)\"\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-84-\nnet/netfilter/ipvs/Kconfig:85:config\tIP_VS_PROTO_UDP\nnet/netfilter/ipvs/Kconfig-86-\tbool \"UDP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig-90-\nnet/netfilter/ipvs/Kconfig:91:config\tIP_VS_PROTO_AH_ESP\nnet/netfilter/ipvs/Kconfig:92:\tdef_bool IP_VS_PROTO_ESP \|\| IP_VS_PROTO_AH\nnet/netfilter/ipvs/Kconfig-93-\nnet/netfilter/ipvs/Kconfig:94:config\tIP_VS_PROTO_ESP\nnet/netfilter/ipvs/Kconfig-95-\tbool \"ESP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig-99-\nnet/netfilter/ipvs/Kconfig:100:config\tIP_VS_PROTO_AH\nnet/netfilter/ipvs/Kconfig-101-\tbool \"AH load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig-105-\nnet/netfilter/ipvs/Kconfig:106:config IP_VS_PROTO_SCTP\nnet/netfilter/ipvs/Kconfig-107-\tbool \"SCTP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig=113=comment \"IPVS scheduler\"\nnet/netfilter/ipvs/Kconfig-114-\nnet/netfilter/ipvs/Kconfig:115:config\tIP_VS_RR\nnet/netfilter/ipvs/Kconfig-116-\ttristate \"round-robin scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-123- \nnet/netfilter/ipvs/Kconfig:124:config\tIP_VS_WRR\nnet/netfilter/ipvs/Kconfig-125-\ttristate \"weighted round-robin scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-136-\nnet/netfilter/ipvs/Kconfig:137:config\tIP_VS_LC\nnet/netfilter/ipvs/Kconfig-138-\ttristate \"least-connection scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-146-\nnet/netfilter/ipvs/Kconfig:147:config\tIP_VS_WLC\nnet/netfilter/ipvs/Kconfig-148-\ttristate \"weighted least-connection scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-156-\nnet/netfilter/ipvs/Kconfig:157:config IP_VS_FO\nnet/netfilter/ipvs/Kconfig-158-\t\ttristate \"weighted failover scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-166-\nnet/netfilter/ipvs/Kconfig:167:config IP_VS_OVF\nnet/netfilter/ipvs/Kconfig-168-\ttristate \"weighted overflow scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-177-\nnet/netfilter/ipvs/Kconfig:178:config\tIP_VS_LBLC\nnet/netfilter/ipvs/Kconfig-179-\ttristate \"locality-based least-connection scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-191-\nnet/netfilter/ipvs/Kconfig:192:config IP_VS_LBLCR\nnet/netfilter/ipvs/Kconfig-193-\ttristate \"locality-based least-connection with replication scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-209-\nnet/netfilter/ipvs/Kconfig:210:config\tIP_VS_DH\nnet/netfilter/ipvs/Kconfig-211-\ttristate \"destination hashing scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-219-\nnet/netfilter/ipvs/Kconfig:220:config\tIP_VS_SH\nnet/netfilter/ipvs/Kconfig-221-\ttristate \"source hashing scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-229-\nnet/netfilter/ipvs/Kconfig:230:config\tIP_VS_MH\nnet/netfilter/ipvs/Kconfig-231-\ttristate \"maglev hashing scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-248-\nnet/netfilter/ipvs/Kconfig:249:config\tIP_VS_SED\nnet/netfilter/ipvs/Kconfig-250-\ttristate \"shortest expected delay scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-261-\nnet/netfilter/ipvs/Kconfig:262:config\tIP_VS_NQ\nnet/netfilter/ipvs/Kconfig-263-\ttristate \"never queue scheduling\"\n--\nnet/netfilter/ipvs/Kconfig-274-\nnet/netfilter/ipvs/Kconfig:275:config\tIP_VS_TWOS\nnet/netfilter/ipvs/Kconfig-276-\ttristate \"weighted random twos choice least-connection scheduling\"\n--\nnet/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n--\nnet/netfilter/ipvs/Kconfig=319=comment 'IPVS application helper'\nnet/netfilter/ipvs/Kconfig-320-\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\nnet/netfilter/ipvs/Kconfig:325:\tselect IP_VS_NFCT\nnet/netfilter/ipvs/Kconfig-326-\thelp\n--\nnet/netfilter/ipvs/Kconfig-336-\nnet/netfilter/ipvs/Kconfig:337:config\tIP_VS_NFCT\nnet/netfilter/ipvs/Kconfig-338-\tbool \"Netfilter connection tracking\"\n--\nnet/netfilter/ipvs/Kconfig-344-\nnet/netfilter/ipvs/Kconfig:345:config\tIP_VS_PE_SIP\nnet/netfilter/ipvs/Kconfig-346-\ttristate \"SIP persistence engine\"\nnet/netfilter/ipvs/Kconfig:347:\tdepends on IP_VS_PROTO_UDP\nnet/netfilter/ipvs/Kconfig-348-\tdepends on NF_CONNTRACK_SIP\n--\nnet/netfilter/ipvs/Kconfig=352=config GCOV_PROFILE_IPVS\n--\nnet/netfilter/ipvs/Kconfig-360-\nnet/netfilter/ipvs/Kconfig:361:endif # IP_VS\n" }
15/2	2026/09/11 18:47	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 23287 output: 28 thoughts: 199 Thoughts: Analyzing the IPVS Synchronization Module Okay, so `ip_vs_sync.c` is being compiled as part of the `ip_vs-objs`, which is all under `CONFIG_IP_VS`. Time to double-check that Makefile... Yup, there it is: ```makefile ip_vs-objs := ip_vs_conn.o ip_vs_core.o ip_vs_ctl.o ip_vs_sched.o \ ip_vs_xmit.o ip_vs_app.o ip_vs_sync.o \ ip_vs_est.o ip_vs_proto.o ip_vs_pe.o ``` So `CONFIG_IP_VS` is the option, huh? It enables the whole IPVS thing, including the synchronization module. Now, let's see what `CONFIG_IP_VS` depends on. I'll need to dig into the kernel's Kconfig files. The usual suspects would be either `net/netfilter/Kconfig` or, more specifically for IPVS, `net/netfilter/ipvs/Kconfig`. I'll start with those and see what turns up.
16/2	2026/09/11 18:47	tool	grepper	0m Args: { "Expression": "config IP_VS", "PathPrefix": "net/netfilter" } Results: { "Output": "net/netfilter/ipvs/Kconfig-4-#\nnet/netfilter/ipvs/Kconfig:5:menuconfig IP_VS\nnet/netfilter/ipvs/Kconfig-6-\ttristate \"IP virtual server support\"\n--\nnet/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n" }
17/2	2026/09/11 18:47	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 24046 output: 36 thoughts: 19 Thoughts: Here's a summary of my initial thoughts, as if I were reading the top of `net/netfilter/ipvs/Kconfig`: Initial Assessment of the IPVS Kconfig File Okay, let's dive into the `net/netfilter/ipvs/Kconfig` file. Given my expertise, I'm expecting this to be the configuration file responsible for controlling the compilation and inclusion of the IP Virtual Server (IPVS) functionality within the Linux kernel. I'm immediately looking for the top-level configuration options that govern the core IPVS feature set. I anticipate seeing dependencies, default values, and potentially some explanations or comments that clarify the purpose and scope of IPVS within the broader networking stack. I'll be quickly scanning for the overall structure of the file: what's enabled as default and under what conditions. Are there any conditional dependencies? Are there sub-features or modules within IPVS that are individually configurable? This file dictates what gets compiled into the kernel. I'll be looking to quickly understand how the overall IPVS functionality is enabled and customized by the user. I'm ready to jump into the details.
18/2	2026/09/11 18:47	tool	read-file	0m Args: { "File": "net/netfilter/ipvs/Kconfig", "FirstLine": 1, "LineCount": 35 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t#\n 3:\t# IP Virtual Server configuration\n 4:\t#\n 5:\tmenuconfig IP_VS\n 6:\t\ttristate \"IP virtual server support\"\n 7:\t\tdepends on INET \u0026\u0026 NETFILTER\n 8:\t\tdepends on (NF_CONNTRACK \|\| NF_CONNTRACK=n)\n 9:\t\thelp\n 10:\t\t IP Virtual Server support will let you build a high-performance\n 11:\t\t virtual server based on cluster of two or more real servers. This\n 12:\t\t option must be enabled for at least one of the clustered computers\n 13:\t\t that will take care of intercepting incoming connections to a\n 14:\t\t single IP address and scheduling them to real servers.\n 15:\t\n 16:\t\t Three request dispatching techniques are implemented, they are\n 17:\t\t virtual server via NAT, virtual server via tunneling and virtual\n 18:\t\t server via direct routing. The several scheduling algorithms can\n 19:\t\t be used to choose which server the connection is directed to,\n 20:\t\t thus load balancing can be achieved among the servers. For more\n 21:\t\t information and its administration program, please visit the\n 22:\t\t following URL: \u003chttp://www.linuxvirtualserver.org/\u003e.\n 23:\t\n 24:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 25:\t\t module, choose M here. If unsure, say N.\n 26:\t\n 27:\tif IP_VS\n 28:\t\n 29:\tconfig\tIP_VS_IPV6\n 30:\t\tbool \"IPv6 support for IPVS\"\n 31:\t\tdepends on IPV6 = y \|\| IP_VS = IPV6\n 32:\t\tselect NF_DEFRAG_IPV6\n 33:\t\thelp\n 34:\t\t Add IPv6 support to IPVS.\n 35:\t\n" }
19/2	2026/09/11 18:47	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 24849 output: 42 thoughts: 52 Thoughts: Okay, let's break this down. Investigating the Call Paths of IPVS Synchronization Functions Alright, so I need to understand the execution flow here. Specifically, I want to trace the calls and understand the entry points for the functions `ip_vs_process_message_v0` and `ip_vs_proc_sync_conn`. They're central to the IPVS synchronization process, so getting a handle on their usage is crucial. My immediate plan is to delve into the `ip_vs_sync.c` file and zero in on the caller functions. A direct search for calls to those functions within that file should get me the answers. This is a good starting point for tracing the execution paths and seeing how these functions fit into the larger picture of IPVS operation and synchronization.
20/2	2026/09/11 18:47	tool	grepper	0m Args: { "Expression": "ip_vs_process_message", "PathPrefix": "net/netfilter/ipvs/ip_vs_sync.c" } Results: { "Output": "net/netfilter/ipvs/ip_vs_sync.c=953=static bool ip_vs_sync_validate_flags(u32 flags)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-969- /\nnet/netfilter/ipvs/ip_vs_sync.c:970:static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer,\nnet/netfilter/ipvs/ip_vs_sync.c-971-\t\t\t\t const size_t buflen)\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1087=static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 msg_end)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1226- /\nnet/netfilter/ipvs/ip_vs_sync.c:1227:static void ip_vs_process_message(struct netns_ipvs ipvs, __u8 buffer,\nnet/netfilter/ipvs/ip_vs_sync.c-1228-\t\t\t\t const size_t buflen)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1289-\t\t/ Old type of message /\nnet/netfilter/ipvs/ip_vs_sync.c:1290:\t\tip_vs_process_message_v0(ipvs, buffer, buflen);\nnet/netfilter/ipvs/ip_vs_sync.c-1291-\t\treturn;\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1725=static int sync_thread_backup(void data)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1753-\nnet/netfilter/ipvs/ip_vs_sync.c:1754:\t\t\tip_vs_process_message(ipvs, tinfo-\u003ebuf, len);\nnet/netfilter/ipvs/ip_vs_sync.c-1755-\t\t}\n" }
21/2	2026/09/11 18:47	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 25655 output: 32 thoughts: 139 Thoughts: Analyzing the IPVS Synchronization Process Okay, let's break this down. My goal is to understand how the IPVS sync daemon functions, specifically the path data takes from network to processing. So, I see that the `sync_thread_backup` function is the entry point, handling multicast packets received on the IPVS sync socket. It then calls `ip_vs_process_message`, passing the IPVS instance (`ipvs`), the packet buffer (`tinfo->buf`), and the packet length (`len`). Now, `ip_vs_process_message` is the central message dispatcher. It checks the message version format. If it's version 0, it delegates to `ip_vs_process_message_v0`. If it's version 1, which is likely the more recent and complex format, it enters a loop and calls `ip_vs_proc_sync_conn` repeatedly. This suggests that version 1 messages likely contain multiple connection sync updates. The next question is: How is the sync daemon itself initialized? I'll need to figure out where `start_sync_thread` is called from. That will give me the high-level picture of how the whole sync process is initiated. I'll need to trace the callers to get the full picture.
22/2	2026/09/11 18:47	tool	grepper	0m Args: { "Expression": "start_sync_thread", "PathPrefix": "net/netfilter/ipvs" } Results: { "Output": "net/netfilter/ipvs/ip_vs_ctl.c=3472=do_ip_vs_set_ctl(struct sock sk, int cmd, sockptr_t ptr, unsigned int len)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3512-\t\t\tcfg.syncid = dm-\u003esyncid;\nnet/netfilter/ipvs/ip_vs_ctl.c:3513:\t\t\tret = start_sync_thread(ipvs, \u0026cfg, dm-\u003estate);\nnet/netfilter/ipvs/ip_vs_ctl.c-3514-\t\t} else {\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=4568=static int ip_vs_genl_new_daemon(struct netns_ipvs ipvs, struct nlattr *attrs)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-4623-\nnet/netfilter/ipvs/ip_vs_ctl.c:4624:\tret = start_sync_thread(ipvs, \u0026c,\nnet/netfilter/ipvs/ip_vs_ctl.c-4625-\t\t\t\tnla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1725=static int sync_thread_backup(void data)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1761-\nnet/netfilter/ipvs/ip_vs_sync.c:1762:int start_sync_thread(struct netns_ipvs ipvs, struct ipvs_sync_daemon_cfg c,\nnet/netfilter/ipvs/ip_vs_sync.c-1763-\t\t int state)\n" }
23/2	2026/09/11 18:47	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 26559 output: 34 thoughts: 989 Thoughts: Analyzing the IPVS Synchronization Patch Okay, let's break this down. My initial thought is to trace the entry points for the backup synchronization thread (`start_sync_thread`). I can see it's triggered in two ways: through `setsockopt` with `IP_VS_SO_SET_STARTDAEMON` on raw, UDP, or TCP sockets (in `do_ip_vs_set_ctl`), and also via generic netlink using `IPVS_CMD_NEW_DAEMON` within `ip_vs_genl_new_daemon`. That's a solid start. The synchronization thread then listens on a UDP multicast socket, typically port 8848. The key concern here, as I see it, is the potential attack surface. Any process with network access – including via loopback, veth, or even tun/tap, packet or raw sockets, or directly through a socket if local multicast delivery is enabled – can potentially inject UDP packets into this stream. This immediately screams "potential vulnerability". Now, time to see if syzkaller has any relevant descriptions. I'll need to use `read-syz-spec` and `syz-grepper` to look for IPVS-related elements. I know IPVS is fully reachable from userspace via generic netlink and setsockopt. Right, the patch itself. I'm focusing on the added validation code. This is where things get interesting. The core of the patch revolves around the `ip_vs_sync_validate_flags` function. It's checking for a few specific flag combinations that are now deemed invalid: `IP_VS_CONN_F_NO_CPORT` combined with `IP_VS_CONN_F_TEMPLATE`, or simply `IP_VS_CONN_F_ONE_PACKET`. These flags were specifically in `ip_vs_process_message_v0` and `ip_vs_proc_sync_conn`. The validation occurs before applying the `IP_VS_CONN_F_BACKUP_MASK` and the `IP_VS_CONN_F_SYNC` flag. The patch essentially filters out connections using these "invalid" flag combinations. The `IP_VS_DBG` messages are a good clue – the goal is to prevent processing messages with these specific flags. So, let's step back and consider why these checks are added. If `IP_VS_CONN_F_NO_CPORT` and `IP_VS_CONN_F_TEMPLATE` were allowed, or if `IP_VS_CONN_F_ONE_PACKET` was allowed, what could go wrong? My intuition says there's a potential for state corruption or bypassing crucial checks, or even perhaps, bypassing a specific flow. Time to look up the definition of `IP_VS_CONN_F_BACKUP_MASK` and see if the answer lies there.
24/2	2026/09/11 18:47	tool	grepper	0m Args: { "Expression": "IP_VS_CONN_F_BACKUP_MASK", "PathPrefix": "include/" } Results: { "Output": "include/uapi/linux/ip_vs.h-93-/* Initial bits allowed in backup server */\ninclude/uapi/linux/ip_vs.h:94:#define IP_VS_CONN_F_BACKUP_MASK (IP_VS_CONN_F_FWD_MASK \| \\\ninclude/uapi/linux/ip_vs.h-95-\t\t\t\t IP_VS_CONN_F_NOOUTPUT \| \\\n" }
25/2	2026/09/11 18:47	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 28318 output: 39 thoughts: 24 Thoughts: Here's my summary, as if I were thinking these thoughts: Diving into the IPVS Implementation Okay, time to get my hands dirty. I want to understand how IP Virtual Server (IPVS) works at a fundamental level. I'm going to navigate to the include files for the Linux kernel and specifically focus on `include/uapi/linux/ip_vs.h`. I'm particularly interested in the code starting around line 93. I remember this is where a key data structure should be defined, the one that holds the core IPVS configuration or perhaps the routing rules. I need to get a clear picture of how those structs are declared and how they relate to the underlying network stack. This file is probably the best place to start. Let's see what's actually in there. I'm expecting some standard definitions here... perhaps the critical data structures like the IPVS service table or the real server configuration structures. I'll probably be looking for the fundamental information needed to construct IPVS's network operations.
26/2	2026/09/11 18:47	tool	read-file	0m Args: { "File": "include/uapi/linux/ip_vs.h", "FirstLine": 80, "LineCount": 40 } Results: { "Contents": " 80:\t#define IP_VS_CONN_F_DROUTE\t0x0003\t\t/* direct routing /\n 81:\t#define IP_VS_CONN_F_BYPASS\t0x0004\t\t/ cache bypass /\n 82:\t#define IP_VS_CONN_F_SYNC\t0x0020\t\t/ entry created by sync /\n 83:\t#define IP_VS_CONN_F_HASHED\t0x0040\t\t/ hashed entry /\n 84:\t#define IP_VS_CONN_F_NOOUTPUT\t0x0080\t\t/ no output packets /\n 85:\t#define IP_VS_CONN_F_INACTIVE\t0x0100\t\t/ not established /\n 86:\t#define IP_VS_CONN_F_OUT_SEQ\t0x0200\t\t/ must do output seq adjust /\n 87:\t#define IP_VS_CONN_F_IN_SEQ\t0x0400\t\t/ must do input seq adjust /\n 88:\t#define IP_VS_CONN_F_SEQ_MASK\t0x0600\t\t/ in/out sequence mask /\n 89:\t#define IP_VS_CONN_F_NO_CPORT\t0x0800\t\t/ no client port set yet /\n 90:\t#define IP_VS_CONN_F_TEMPLATE\t0x1000\t\t/ template, not connection /\n 91:\t#define IP_VS_CONN_F_ONE_PACKET\t0x2000\t\t/ forward only one packet /\n 92:\t\n 93:\t/ Initial bits allowed in backup server /\n 94:\t#define IP_VS_CONN_F_BACKUP_MASK (IP_VS_CONN_F_FWD_MASK \| \\\n 95:\t\t\t\t\t IP_VS_CONN_F_NOOUTPUT \| \\\n 96:\t\t\t\t\t IP_VS_CONN_F_INACTIVE \| \\\n 97:\t\t\t\t\t IP_VS_CONN_F_SEQ_MASK \| \\\n 98:\t\t\t\t\t IP_VS_CONN_F_NO_CPORT \| \\\n 99:\t\t\t\t\t IP_VS_CONN_F_TEMPLATE \\\n 100:\t\t\t\t\t )\n 101:\t\n 102:\t/ Bits allowed to update in backup server /\n 103:\t#define IP_VS_CONN_F_BACKUP_UPD_MASK (IP_VS_CONN_F_INACTIVE \| \\\n 104:\t\t\t\t\t IP_VS_CONN_F_SEQ_MASK)\n 105:\t\n 106:\t/ Flags that are not sent to backup server start from bit 16 /\n 107:\t#define IP_VS_CONN_F_NFCT\t(1 \u003c\u003c 16)\t/ use netfilter conntrack /\n 108:\t\n 109:\t/ Connection flags from destination that can be changed by user space */\n 110:\t#define IP_VS_CONN_F_DEST_MASK (IP_VS_CONN_F_FWD_MASK \| \\\n 111:\t\t\t\t\tIP_VS_CONN_F_ONE_PACKET \| \\\n 112:\t\t\t\t\tIP_VS_CONN_F_NFCT \| \\\n 113:\t\t\t\t\t0)\n 114:\t\n 115:\t#define IP_VS_SCHEDNAME_MAXLEN\t16\n 116:\t#define IP_VS_PENAME_MAXLEN\t16\n 117:\t#define IP_VS_IFNAME_MAXLEN\t16\n 118:\t\n 119:\t#define IP_VS_PEDATA_MAXLEN 255\n" }
27/2	2026/09/11 18:47	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 29512 output: 45 thoughts: 1777 Thoughts: Analysis of IPVS Connection Sync Vulnerability and Fuzzing Potential Okay, so I've been digging into this patch. The key here is how IPVS handles connection synchronization messages, specifically versions 0 and 1. It seems like the mask `IP_VS_CONN_F_BACKUP_MASK` includes `IP_VS_CONN_F_NO_CPORT` and `IP_VS_CONN_F_TEMPLATE`, which is immediately interesting. If both are set, that could lead to some weird edge cases. In the pre-patch v0 code, the flag masking was missing `IP_VS_CONN_F_BACKUP_MASK` entirely! That means any flag could sneak in. With v1, they at least have a mask, but it includes both potentially conflicting flags, `NO_CPORT` and `TEMPLATE`. What happens when a connection is marked with both of those? I need to check the logic in `__ip_vs_conn_in_get` and `ip_vs_conn_new` to see how it handles templates and `NO_CPORT`. The `cport` field on a template is 0, so I need to see what the lookup and creation logic does with this. The code seems to use `atomic_inc` and `atomic_dec` on `no_cport_conns` when `NO_CPORT` is set, and there's logic around `IP_VS_CONN_F_ONE_PACKET` as well. If `ONE_PACKET` is enabled, these connections might be short lived, or synced incorrectly. So, this looks like a potential vulnerability. It's definitely reachable code within the IPVS core subsystem (`net/netfilter/ipvs/ip_vs_sync.c`). The sync daemon receives these messages over the network via multicast UDP packets. These are parsed in a kernel thread (`sync_thread_backup`) through a chain of functions, all the way down to `ip_vs_process_message`, `ip_vs_process_message_v0`, and `ip_vs_proc_sync_conn`. It seems like these functions are the key to parsing untrusted network packets coming from a multicast receiver. The patch aims to add validation via `ip_vs_sync_validate_flags`, and adds masking in v0, and rejects invalid flag combinations. So it's addressing this issue directly. Based on the instructions, this is absolutely worth fuzzing. It touches core networking, netfilter, IPVS protocols, and handling untrusted input. Now, let's nail down `FocusSymbols`. What are the relevant symbols to target with the fuzzer? We have `ip_vs_sync_validate_flags` which is at the heart of the added validation. The issue is whether this static helper is inlined. Looks like it's a static function, and a small helper. It is called in `ip_vs_process_message_v0` and `ip_vs_proc_sync_conn`. The latter is `static inline`, which means the compiler might inline it. Let's see what calls it. `ip_vs_process_message` -> `sync_thread_backup` and `ip_vs_process_message_v0`. The v0 function, and main parser, is around 70 lines and `ip_vs_process_message` is around 75 lines, so, they are not that big and might be the right `FocusSymbols`. I need to focus on what specifically implements this logic. According to the guidelines, I should target non-static functions, so let's check for any non-static functions in `ip_vs_sync.c`.
28/2	2026/09/11 18:47	tool	grepper	0m Args: { "Expression": "^[a-zA-Z_].\\)", "PathPrefix": "net/netfilter/ipvs/ip_vs_sync.c" } Results:* { "Output": "net/netfilter/ipvs/ip_vs_sync.c=269=struct ip_vs_sync_buff {\n--\nnet/netfilter/ipvs/ip_vs_sync.c-282- /\nnet/netfilter/ipvs/ip_vs_sync.c:283:static void ntoh_seq(struct ip_vs_seq no, struct ip_vs_seq ho)\nnet/netfilter/ipvs/ip_vs_sync.c-284-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-294- /\nnet/netfilter/ipvs/ip_vs_sync.c:295:static void hton_seq(struct ip_vs_seq ho, struct ip_vs_seq no)\nnet/netfilter/ipvs/ip_vs_sync.c-296-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=302=static inline struct ip_vs_sync_buff \nnet/netfilter/ipvs/ip_vs_sync.c:303:sb_dequeue(struct netns_ipvs ipvs, struct ipvs_master_sync_state ms)\nnet/netfilter/ipvs/ip_vs_sync.c-304-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=327=static inline struct ip_vs_sync_buff \nnet/netfilter/ipvs/ip_vs_sync.c:328:ip_vs_sync_buff_create(struct netns_ipvs ipvs, unsigned int len)\nnet/netfilter/ipvs/ip_vs_sync.c-329-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-354-\nnet/netfilter/ipvs/ip_vs_sync.c:355:static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff sb)\nnet/netfilter/ipvs/ip_vs_sync.c-356-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=405=static inline int\nnet/netfilter/ipvs/ip_vs_sync.c:406:select_master_thread_id(struct netns_ipvs ipvs, struct ip_vs_conn cp)\nnet/netfilter/ipvs/ip_vs_sync.c-407-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=414=static inline struct ip_vs_sync_buff \nnet/netfilter/ipvs/ip_vs_sync.c:415:ip_vs_sync_buff_create_v0(struct netns_ipvs ipvs, unsigned int len)\nnet/netfilter/ipvs/ip_vs_sync.c-416-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-440-/* Check if connection is controlled by persistence /\nnet/netfilter/ipvs/ip_vs_sync.c:441:static inline bool in_persistence(struct ip_vs_conn cp)\nnet/netfilter/ipvs/ip_vs_sync.c-442-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=539=static void ip_vs_sync_conn_v0(struct netns_ipvs ipvs, struct ip_vs_conn cp,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-628- /\nnet/netfilter/ipvs/ip_vs_sync.c:629:void ip_vs_sync_conn(struct netns_ipvs ipvs, struct ip_vs_conn cp, int pkts)\nnet/netfilter/ipvs/ip_vs_sync.c-630-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=841=static void ip_vs_proc_conn(struct netns_ipvs ipvs, struct ip_vs_conn_param param,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-952-/ Check for incompatible flags /\nnet/netfilter/ipvs/ip_vs_sync.c:953:static bool ip_vs_sync_validate_flags(u32 flags)\nnet/netfilter/ipvs/ip_vs_sync.c-954-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1067=static int ip_vs_proc_str(__u8 p, unsigned int plen, unsigned int data_len,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1086- /\nnet/netfilter/ipvs/ip_vs_sync.c:1087:static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 msg_end)\nnet/netfilter/ipvs/ip_vs_sync.c-1088-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1227=static void ip_vs_process_message(struct netns_ipvs ipvs, __u8 buffer,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1298- /\nnet/netfilter/ipvs/ip_vs_sync.c:1299:static void set_sock_size(struct sock sk, int mode, int val)\nnet/netfilter/ipvs/ip_vs_sync.c-1300-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1320- /\nnet/netfilter/ipvs/ip_vs_sync.c:1321:static void set_mcast_loop(struct sock sk, u_char loop)\nnet/netfilter/ipvs/ip_vs_sync.c-1322-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1335- /\nnet/netfilter/ipvs/ip_vs_sync.c:1336:static void set_mcast_ttl(struct sock sk, u_char ttl)\nnet/netfilter/ipvs/ip_vs_sync.c-1337-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1354-/ Control fragmentation of messages /\nnet/netfilter/ipvs/ip_vs_sync.c:1355:static void set_mcast_pmtudisc(struct sock sk, int val)\nnet/netfilter/ipvs/ip_vs_sync.c-1356-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1375- /\nnet/netfilter/ipvs/ip_vs_sync.c:1376:static int set_mcast_if(struct sock sk, struct net_device dev)\nnet/netfilter/ipvs/ip_vs_sync.c-1377-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1405=static int\nnet/netfilter/ipvs/ip_vs_sync.c:1406:join_mcast_group(struct sock sk, struct in_addr addr, struct net_device dev)\nnet/netfilter/ipvs/ip_vs_sync.c-1407-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1427=static int join_mcast_group6(struct sock sk, struct in6_addr addr,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1442-\nnet/netfilter/ipvs/ip_vs_sync.c:1443:static int bind_mcastif_addr(struct socket sock, struct net_device dev)\nnet/netfilter/ipvs/ip_vs_sync.c-1444-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1595=static int\nnet/netfilter/ipvs/ip_vs_sync.c:1596:ip_vs_send_async(struct socket sock, const char buffer, const size_t length)\nnet/netfilter/ipvs/ip_vs_sync.c-1597-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1610=static int\nnet/netfilter/ipvs/ip_vs_sync.c:1611:ip_vs_send_sync_msg(struct socket sock, struct ip_vs_sync_mesg msg)\nnet/netfilter/ipvs/ip_vs_sync.c-1612-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1625=static int\nnet/netfilter/ipvs/ip_vs_sync.c:1626:ip_vs_receive(struct socket sock, char buffer, const size_t buflen)\nnet/netfilter/ipvs/ip_vs_sync.c-1627-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1641-/* Wakeup the master thread for sending /\nnet/netfilter/ipvs/ip_vs_sync.c:1642:static void master_wakeup_work_handler(struct work_struct work)\nnet/netfilter/ipvs/ip_vs_sync.c-1643-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1661=static inline struct ip_vs_sync_buff \nnet/netfilter/ipvs/ip_vs_sync.c:1662:next_sync_buff(struct netns_ipvs ipvs, struct ipvs_master_sync_state ms)\nnet/netfilter/ipvs/ip_vs_sync.c-1663-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1672-\nnet/netfilter/ipvs/ip_vs_sync.c:1673:static int sync_thread_master(void data)\nnet/netfilter/ipvs/ip_vs_sync.c-1674-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1724-\nnet/netfilter/ipvs/ip_vs_sync.c:1725:static int sync_thread_backup(void data)\nnet/netfilter/ipvs/ip_vs_sync.c-1726-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1762=int start_sync_thread(struct netns_ipvs ipvs, struct ipvs_sync_daemon_cfg c,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1977-\nnet/netfilter/ipvs/ip_vs_sync.c:1978:int stop_sync_thread(struct netns_ipvs ipvs, int state)\nnet/netfilter/ipvs/ip_vs_sync.c-1979-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-2065- /\nnet/netfilter/ipvs/ip_vs_sync.c:2066:int __net_init ip_vs_sync_net_init(struct netns_ipvs ipvs)\nnet/netfilter/ipvs/ip_vs_sync.c-2067-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c-2073-\nnet/netfilter/ipvs/ip_vs_sync.c:2074:void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs)\nnet/netfilter/ipvs/ip_vs_sync.c-2075-{\n" }
29/2	2026/09/11 18:47	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 35092 output: 38 thoughts: 576 Thoughts: My Analysis of IPVS Sync Daemon Fuzzing Targets Okay, let's break this down systematically. I need to figure out the most effective entry points for fuzzing the IPVS sync daemon using syzkaller. First, I need to identify the key, non-static API entry points in `ip_vs_sync.c`. I see: `start_sync_thread`, `stop_sync_thread`, `ip_vs_sync_conn`, `ip_vs_sync_net_init`, and `ip_vs_sync_net_cleanup`. Those seem like obvious starting points. Next, I need to zero in on what functions within `ip_vs_sync.c` are actually modified or core to the sync process. I've got: `ip_vs_sync_validate_flags`, `ip_vs_process_message_v0`, `ip_vs_proc_sync_conn`, `ip_vs_process_message` (which is important because it calls both `ip_vs_process_message_v0` and `ip_vs_proc_sync_conn`), and the backup thread `sync_thread_backup`. Now, digging deeper. I see that `start_sync_thread` is the crucial entry point, since userspace calls it via netlink or `setsockopt` with `IP_VS_STATE_BACKUP` to launch the daemon. Therefore, that function is critical. In conjunction, the other functions mentioned should also be tested, in conjunction with that entry. Given my understanding of syzkaller, it targets any symbol available in `/proc/kallsyms`, even static functions (as long as they aren't inlined). So, including both the modified static functions like `ip_vs_sync_validate_flags`, `ip_vs_process_message_v0`, `ip_vs_proc_sync_conn`, and `ip_vs_process_message`, along with the primary feature entrypoint `start_sync_thread` and the `sync_thread_backup` loop, should give me excellent coverage without wasting fuzzing cycles on irrelevant targets. Finally, configuration. I need to ensure the right kernel config options are set. I know `CONFIG_IP_VS` is essential, obviously. I'm checking the `Kconfig` file and it seems this also depends on `INET && NETFILTER`, and potentially `NF_CONNTRACK` (or not). But, based on my quick perusal of `ip_vs_sync.c` there doesn't seem to be any conditional compilation or `#ifdef` blocks around the sync daemon itself. It looks like the sync daemon is always compiled when `IP_VS` is enabled. Excellent.
30/2	2026/09/11 18:48	tool	grepper	0m Args: { "Expression": "ifdef.CONFIG", "PathPrefix": "net/netfilter/ipvs/ip_vs_sync.c" } Results:* { "Output": "net/netfilter/ipvs/ip_vs_sync.c=629=void ip_vs_sync_conn(struct netns_ipvs ipvs, struct ip_vs_conn cp, int pkts)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-669-\nnet/netfilter/ipvs/ip_vs_sync.c:670:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-671-\tif (cp-\u003eaf == AF_INET6)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-732-\nnet/netfilter/ipvs/ip_vs_sync.c:733:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-734-\tif (cp-\u003eaf == AF_INET6) {\n--\nnet/netfilter/ipvs/ip_vs_sync.c=788=ip_vs_conn_fill_param_sync(struct netns_ipvs ipvs, int af, union ip_vs_sync_conn sc,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-792-{\nnet/netfilter/ipvs/ip_vs_sync.c:793:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-794-\tif (af == AF_INET6)\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1087=static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 msg_end)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1101-\tif (s-\u003ev6.type \u0026 STYPE_F_INET6) {\nnet/netfilter/ipvs/ip_vs_sync.c:1102:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-1103-\t\taf = AF_INET6;\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1205-\t\t\t\t);\nnet/netfilter/ipvs/ip_vs_sync.c:1206:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-1207-\telse\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1321=static void set_mcast_loop(struct sock sk, u_char loop)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1324-\tinet_assign_bit(MC_LOOP, sk, loop);\nnet/netfilter/ipvs/ip_vs_sync.c:1325:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-1326-\tif (READ_ONCE(sk-\u003esk_family) == AF_INET6) {\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1336=static void set_mcast_ttl(struct sock sk, u_char ttl)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1342-\tWRITE_ONCE(inet-\u003emc_ttl, ttl);\nnet/netfilter/ipvs/ip_vs_sync.c:1343:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-1344-\tif (sk-\u003esk_family == AF_INET6) {\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1355=static void set_mcast_pmtudisc(struct sock sk, int val)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1361-\tWRITE_ONCE(inet-\u003epmtudisc, val);\nnet/netfilter/ipvs/ip_vs_sync.c:1362:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-1363-\tif (sk-\u003esk_family == AF_INET6) {\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1376=static int set_mcast_if(struct sock sk, struct net_device dev)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1385-\t/* inet-\u003emc_addr = 0; /\nnet/netfilter/ipvs/ip_vs_sync.c:1386:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-1387-\tif (sk-\u003esk_family == AF_INET6) {\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1406=join_mcast_group(struct sock sk, struct in_addr addr, struct net_device dev)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1425-\nnet/netfilter/ipvs/ip_vs_sync.c:1426:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-1427-static int join_mcast_group6(struct sock sk, struct in6_addr addr,\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1544=static int make_receive_sock(struct netns_ipvs ipvs, int id,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1574-\t/ join the multicast group */\nnet/netfilter/ipvs/ip_vs_sync.c:1575:#ifdef CONFIG_IP_VS_IPV6\nnet/netfilter/ipvs/ip_vs_sync.c-1576-\tif (ipvs-\u003ebcfg.mcast_af == AF_INET6)\n" }
31/2	2026/09/11 18:48	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 37827 output: 205 thoughts: 374 Thoughts: My Analysis of the IPVS Synchronization Patch Okay, so `ip_vs_sync.o` is definitely built alongside `ip_vs` whenever the main `CONFIG_IP_VS` option is enabled – that's a given. And, of course, `CONFIG_IP_VS_IPV6` provides IPv6 support, as expected. Let's make sure `CONFIG_IP_VS` itself is enabled. Its parents are `NETFILTER` and `INET`, which are fairly fundamental. Now, let's look at the important functions: * `ip_vs_sync_validate_flags`: Flag validation, that's crucial. * `ip_vs_process_message_v0`, `ip_vs_process_message`: I need to look at both v0 and v1 sync messages. * `ip_vs_proc_sync_conn`: Connecting synchronization. * `start_sync_thread`, `sync_thread_backup`: Thread management. Here's my EnableConfigs checklist: * `IP_VS` * `NETFILTER` * `INET` Worth fuzzing? Absolutely. The patch deals with incoming synchronization messages from backup IPVS threads – potentially from untrusted sources, and flags which can have incompatibilities. It looks like `ip_vs_sync_validate_flags` prevents things like `IP_VS_CONN_F_NO_CPORT` and `IP_VS_CONN_F_TEMPLATE` from mixing with `IP_VS_CONN_F_ONE_PACKET` flags. Since this code runs in the kernel and processes network packets, it's definitely a good target for fuzzing. It impacts the netfilter/IPVS subsystem and reachable network code. Finally, let's run a sanity check on the instruction set: * One `set-results` call. Check. * EnableConfigs are correct. Check. * FocusSymbols are specific, not generic – these are good targets for deeper analysis. Check. * The reasoning is concise and to the point. Check. Everything checks out. I'm satisfied. Time to move on.
32/2	2026/09/11 18:48	tool	set-results	0m Args: { "EnableConfigs": [ "IP_VS", "NETFILTER", "INET" ], "FocusSymbols": [ "ip_vs_sync_validate_flags", "ip_vs_process_message_v0", "ip_vs_proc_sync_conn", "ip_vs_process_message", "sync_thread_backup", "start_sync_thread" ], "Reasoning": "The patch introduces flag validation (ip_vs_sync_validate_flags) and proper masking when parsing incoming IPVS sync messages in the backup daemon, rejecting incompatible flags such as IP_VS_CONN_F_NO_CPORT with IP_VS_CONN_F_TEMPLATE or IP_VS_CONN_F_ONE_PACKET in both v0 and v1 message formats. This modifies reachable network protocol processing in netfilter/IPVS and warrants fuzzing.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "IP_VS", "NETFILTER", "INET" ], "FocusSymbols": [ "ip_vs_sync_validate_flags", "ip_vs_process_message_v0", "ip_vs_proc_sync_conn", "ip_vs_process_message", "sync_thread_backup", "start_sync_thread" ], "Reasoning": "The patch introduces flag validation (ip_vs_sync_validate_flags) and proper masking when parsing incoming IPVS sync messages in the backup daemon, rejecting incompatible flags such as IP_VS_CONN_F_NO_CPORT with IP_VS_CONN_F_TEMPLATE or IP_VS_CONN_F_ONE_PACKET in both v0 and v1 message formats. This modifies reachable network protocol processing in netfilter/IPVS and warrants fuzzing.", "WorthFuzzing": true }
33/1	2026/09/11 18:48	action	If	1m Args: { "WorthFuzzing": true } Results: null
34/2	2026/09/11 18:48	agent	kmsan-evaluator	1m Model: core Args: null Results: { "KMSANReasoning": "The patch introduces flag validation (`ip_vs_sync_validate_flags`) in the IPVS synchronization message handling functions (`ip_vs_process_message_v0` and `ip_vs_proc_sync_conn`) to reject invalid flag combinations (e.g., `IP_VS_CONN_F_ONE_PACKET` or `IP_VS_CONN_F_NO_CPORT` combined with `IP_VS_CONN_F_TEMPLATE`). The flags variable is directly initialized from received network packet data (`ntohs` / `ntohl`), and the validation logic only adds early rejection of invalid sync messages. No heap/stack memory allocations are introduced or modified, no buffer length calculations or copying to user space are altered, and no uninitialized variables or struct padding are read or exposed. Any potential issues stemming from incompatible flags (such as state inconsistencies, refcount errors, or use-after-free) are detectable by standard KASAN/refcount checks. Therefore, a dedicated KMSAN fuzzing session is not needed.", "NeedsKMSAN": false } Instruction: You are an expert Linux kernel security engineer specializing in kernel memory error detectors (KASAN and KMSAN). Your job is to review the provided patch series and determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer) fuzzing session in addition to standard KASAN fuzzing. CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN: - Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable a comprehensive suite of debugging tools and sanitizers, including KASAN (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks. - KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap, or page allocations) and kernel-to-user memory info-leaks. Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN, LOCKDEP, OR OTHER STANDARD BUG DETECTORS. A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks that are detected ONLY by KMSAN. Look holistically at the patch series and surrounding code. Even if no direct uninitialized field accesses or new buffer allocations are added in the diff itself, a patch may alter control flow, bounds checking, or data length calculations in ways that change how the rest of the code operates on existing buffers (e.g. allowing uninitialized stack/heap memory to be read, copied to user space, or used in control flow). Do not hesitate to use your code access tools to inspect the surrounding code, called functions, and callers. Set NeedsKMSAN=true ONLY IF the patch introduces or modifies: 1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb attributes, ioctl output arguments, socket options, or BPF buffers) where fields or structure padding might not be fully initialized/zeroed. 2. Conditional logic or branching that depends on potentially uninitialized variables or struct fields. 3. Allocation or initialization of complex data structures where uninitialized fields could be read later in reachable code paths. 4. Bounds checks, lengths, or logic in a way that allows surrounding code to access uninitialized bytes of existing buffers. Set NeedsKMSAN=false IF: - The code changes primarily risk out-of-bounds access, array overflows, NULL pointer dereferences, locking deadlocks, or use-after-free bugs (these are already caught by KASAN, LOCKDEP, or standard bug detectors). - All stack/heap structures touched or introduced by the patch are fully zeroed or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied. - The patch does not introduce any risk of uninitialized memory usage or info-leaks. Use your code access tools to inspect the surrounding code if necessary, then provide detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch. Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit 6f726991e6af6971311a0a00692b0a1bb1c2393d Author: syz-cluster <triage@syzkaller.com> Date: Fri Sep 11 18:46:36 2026 +0000 syz-cluster: applied patch under review diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c index 5383aeafb0aed..69dc28153ec12 100644 --- a/net/netfilter/ipvs/ip_vs_sync.c +++ b/net/netfilter/ipvs/ip_vs_sync.c @@ -949,6 +949,21 @@ static void ip_vs_proc_conn(struct netns_ipvs ipvs, struct ip_vs_conn_param pa ip_vs_conn_put(cp); } +/* Check for incompatible flags / +static bool ip_vs_sync_validate_flags(u32 flags) +{ + / We do not expect NO_CPORT, especially to allow lookups + * to hit templates + / + if (flags & IP_VS_CONN_F_NO_CPORT) { + if (flags & IP_VS_CONN_F_TEMPLATE) + return false; + } + if (flags & IP_VS_CONN_F_ONE_PACKET) + return false; + return true; +} + / * Process received multicast message for Version 0 / @@ -972,8 +987,7 @@ static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer return; } s = (struct ip_vs_sync_conn_v0 ) p; - flags = ntohs(s->flags) \| IP_VS_CONN_F_SYNC; - flags &= ~IP_VS_CONN_F_HASHED; + flags = ntohs(s->flags); if (flags & IP_VS_CONN_F_SEQ_MASK) { opt = (struct ip_vs_sync_conn_options )&s[1]; p += FULL_CONN_SIZE; @@ -986,6 +1000,13 @@ static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer p += SIMPLE_CONN_SIZE; } + if (!ip_vs_sync_validate_flags(flags)) { + IP_VS_DBG(2, "BACKUP v0, Invalid flags 0x%X\n", flags); + continue; + } + flags &= IP_VS_CONN_F_BACKUP_MASK; + flags \|= IP_VS_CONN_F_SYNC; + state = ntohs(s->state); if (!(flags & IP_VS_CONN_F_TEMPLATE)) { pp = ip_vs_proto_get(s->protocol); @@ -1141,7 +1162,13 @@ static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 m } /* Get flags and Mask off unsupported */ - flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK; + flags = ntohl(s->v4.flags); + if (!ip_vs_sync_validate_flags(flags)) { + IP_VS_DBG(3, "BACKUP, Invalid flags 0x%X\n", flags); + retc = 25; + goto out; + } + flags &= IP_VS_CONN_F_BACKUP_MASK; flags \|= IP_VS_CONN_F_SYNC; state = ntohs(s->v4.state);
35/3	2026/09/11 18:48	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 2809 output: 44 thoughts: 1024 Thoughts: KMSAN Fuzzing Session Justification Okay, so I'm looking at this patch and trying to decide if it warrants firing up a dedicated KMSAN fuzzing session. Let's break it down. First, I see the patch modifies `net/netfilter/ipvs/ip_vs_sync.c`. This is about IPVS (IP Virtual Server), specifically the synchronization code. I know this area is a critical component for load balancing and high availability, and therefore a place where subtle errors can have significant impact. Synchronization, by its nature, is a common source of concurrency issues. The core of the patch introduces a validation function, `ip_vs_sync_validate_flags()`. It seems we're now explicitly checking the validity of connection flags received during synchronization. The code is specifically guarding against `IP_VS_CONN_F_NO_CPORT` and `IP_VS_CONN_F_ONE_PACKET` in certain combinations, and now adds a check to confirm flags don't get 'hashed', before applying the proper mask, which increases the likelihood of an error state being caught. I'm inferring this is because certain flag combinations can lead to inconsistencies or errors in how connections are handled, especially when used with `IP_VS_CONN_F_TEMPLATE`. The checks are also added to both the v0 and v4 processing. The commit log implies that these checks are related to an issue where bad flag values are being received during the synchronization process and the patch now guards against that. Given the sensitive nature of this code, the change in behavior is worth looking into. Given the potential for subtle errors in the synchronization process, and the introduction of new checks, this patch is a strong candidate for KMSAN fuzzing. The checks will likely increase the likelihood of discovering and exposing any existing memory corruption issues. It also suggests that this functionality is more complex than it first appears, which requires extra testing and validation. I'll recommend the fuzzing session.
36/3	2026/09/11 18:48	tool	grepper	0m Args: { "Expression": "ip_vs_proc_sync_conn", "PathPrefix": "net/netfilter/ipvs/ip_vs_sync.c" } Results: { "Output": "net/netfilter/ipvs/ip_vs_sync.c=1067=static int ip_vs_proc_str(__u8 p, unsigned int plen, unsigned int data_len,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1086- /\nnet/netfilter/ipvs/ip_vs_sync.c:1087:static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 msg_end)\nnet/netfilter/ipvs/ip_vs_sync.c-1088-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1227=static void ip_vs_process_message(struct netns_ipvs ipvs, __u8 buffer,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1278-\t\t\t/* Process a single sync_conn */\nnet/netfilter/ipvs/ip_vs_sync.c:1279:\t\t\tretc = ip_vs_proc_sync_conn(ipvs, p, msg_end);\nnet/netfilter/ipvs/ip_vs_sync.c-1280-\t\t\tif (retc \u003c 0) {\n" }
37/3	2026/09/11 18:48	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 4623 output: 43 thoughts: 44 Thoughts: Here's my summary, as though I'm thinking through this process: Diving into the IPVS Synchronization Code Okay, so I need to get a handle on how IPVS syncs its state, particularly when it comes to replicating and maintaining cluster consistency. Given the need to deeply understand the synchronization process, I should probably focus on two specific areas within `ip_vs_sync.c`. Let's target lines 950-1010 and then lines 1130-1175. That should be a good starting point. Those sections likely deal with core synchronization operations – perhaps the heart of how different nodes maintain a consistent view of the virtual services and real servers. Focusing on those sections should quickly reveal some of the nuances of the synchronization mechanisms in use. I expect to see data structures, algorithms, and possibly some network packet interactions. Time to dig in!
38/3	2026/09/11 18:48	tool	read-file	0m Args: { "File": "net/netfilter/ipvs/ip_vs_sync.c", "FirstLine": 940, "LineCount": 75 } Results: { "Contents": " 940:\t\t} else {\n 941:\t\t\tstruct ip_vs_proto_data pd;\n 942:\t\n 943:\t\t\tpd = ip_vs_proto_data_get(ipvs, protocol);\n 944:\t\t\tif (!(flags \u0026 IP_VS_CONN_F_TEMPLATE) \u0026\u0026 pd \u0026\u0026 pd-\u003etimeout_table)\n 945:\t\t\t\tcp-\u003etimeout = pd-\u003etimeout_table[state];\n 946:\t\t\telse\n 947:\t\t\t\tcp-\u003etimeout = (360HZ);\n 948:\t\t}\n 949:\t\tip_vs_conn_put(cp);\n 950:\t}\n 951:\t\n 952:\t/ Check for incompatible flags /\n 953:\tstatic bool ip_vs_sync_validate_flags(u32 flags)\n 954:\t{\n 955:\t\t/ We do not expect NO_CPORT, especially to allow lookups\n 956:\t\t * to hit templates\n 957:\t\t /\n 958:\t\tif (flags \u0026 IP_VS_CONN_F_NO_CPORT) {\n 959:\t\t\tif (flags \u0026 IP_VS_CONN_F_TEMPLATE)\n 960:\t\t\t\treturn false;\n 961:\t\t}\n 962:\t\tif (flags \u0026 IP_VS_CONN_F_ONE_PACKET)\n 963:\t\t\treturn false;\n 964:\t\treturn true;\n 965:\t}\n 966:\t\n 967:\t/\n 968:\t * Process received multicast message for Version 0\n 969:\t /\n 970:\tstatic void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer,\n 971:\t\t\t\t\t const size_t buflen)\n 972:\t{\n 973:\t\tstruct ip_vs_sync_mesg_v0 m = (struct ip_vs_sync_mesg_v0 )buffer;\n 974:\t\tstruct ip_vs_sync_conn_v0 s;\n 975:\t\tstruct ip_vs_sync_conn_options opt;\n 976:\t\tstruct ip_vs_protocol pp;\n 977:\t\tstruct ip_vs_conn_param param;\n 978:\t\tchar p;\n 979:\t\tint i;\n 980:\t\n 981:\t\tp = (char )buffer + sizeof(struct ip_vs_sync_mesg_v0);\n 982:\t\tfor (i=0; i\u003cm-\u003enr_conns; i++) {\n 983:\t\t\tunsigned int flags, state;\n 984:\t\n 985:\t\t\tif (p + SIMPLE_CONN_SIZE \u003e buffer+buflen) {\n 986:\t\t\t\tIP_VS_ERR_RL(\"BACKUP v0, bogus conn\\n\");\n 987:\t\t\t\treturn;\n 988:\t\t\t}\n 989:\t\t\ts = (struct ip_vs_sync_conn_v0 ) p;\n 990:\t\t\tflags = ntohs(s-\u003eflags);\n 991:\t\t\tif (flags \u0026 IP_VS_CONN_F_SEQ_MASK) {\n 992:\t\t\t\topt = (struct ip_vs_sync_conn_options )\u0026s[1];\n 993:\t\t\t\tp += FULL_CONN_SIZE;\n 994:\t\t\t\tif (p \u003e buffer+buflen) {\n 995:\t\t\t\t\tIP_VS_ERR_RL(\"BACKUP v0, Dropping buffer bogus conn options\\n\");\n 996:\t\t\t\t\treturn;\n 997:\t\t\t\t}\n 998:\t\t\t} else {\n 999:\t\t\t\topt = NULL;\n1000:\t\t\t\tp += SIMPLE_CONN_SIZE;\n1001:\t\t\t}\n1002:\t\n1003:\t\t\tif (!ip_vs_sync_validate_flags(flags)) {\n1004:\t\t\t\tIP_VS_DBG(2, \"BACKUP v0, Invalid flags 0x%X\\n\", flags);\n1005:\t\t\t\tcontinue;\n1006:\t\t\t}\n1007:\t\t\tflags \u0026= IP_VS_CONN_F_BACKUP_MASK;\n1008:\t\t\tflags \|= IP_VS_CONN_F_SYNC;\n1009:\t\n1010:\t\t\tstate = ntohs(s-\u003estate);\n1011:\t\t\tif (!(flags \u0026 IP_VS_CONN_F_TEMPLATE)) {\n1012:\t\t\t\tpp = ip_vs_proto_get(s-\u003eprotocol);\n1013:\t\t\t\tif (!pp) {\n1014:\t\t\t\t\tIP_VS_DBG(2, \"BACKUP v0, Unsupported protocol %u\\n\",\n" }
39/3	2026/09/11 18:48	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 6106 output: 44 thoughts: 18 Thoughts: Okay, here's the summary, rendered as if it's my own thought process: Diving Deeper: Lines 1140-1175 Alright, time to focus in a bit. The broader context is clear, but I need to make sure I'm catching the nuances. I'm going to zero in on lines 1140-1175. That segment, if I recall correctly, is where they really start to unpack the implications of [briefly mention the topic from before]. It's likely a critical section for understanding [mention something specific, like "the interplay of X and Y" or "the specific mechanism at play"]. I'll be looking for [mention key things you're looking for, like "any subtle shifts in the argument," "evidence supporting the hypothesis," or "potential counterarguments"]. My goal is to extract the core ideas presented and make sure they align with my existing framework, or identify exactly where they deviate and why. I expect to be able to make some insightful comments on this section; I'm ready to dig in.
40/3	2026/09/11 18:48	tool	read-file	0m Args: { "File": "net/netfilter/ipvs/ip_vs_sync.c", "FirstLine": 1140, "LineCount": 40 } Results: { "Contents": "1140:\t\t\t\t\t\t IP_VS_PEDATA_MAXLEN, \u0026opt_flags,\n1141:\t\t\t\t\t\t IPVS_OPT_F_PE_DATA))\n1142:\t\t\t\t\treturn -60;\n1143:\t\t\t\tbreak;\n1144:\t\n1145:\t\t\tcase IPVS_OPT_PE_NAME:\n1146:\t\t\t\tif (ip_vs_proc_str(p, plen,\u0026pe_name_len, \u0026pe_name,\n1147:\t\t\t\t\t\t IP_VS_PENAME_MAXLEN, \u0026opt_flags,\n1148:\t\t\t\t\t\t IPVS_OPT_F_PE_NAME))\n1149:\t\t\t\t\treturn -70;\n1150:\t\t\t\tbreak;\n1151:\t\n1152:\t\t\tdefault:\n1153:\t\t\t\t/* Param data mandatory ? /\n1154:\t\t\t\tif (!(ptype \u0026 IPVS_OPT_F_PARAM)) {\n1155:\t\t\t\t\tIP_VS_DBG(3, \"BACKUP, Unknown mandatory param %d found\\n\",\n1156:\t\t\t\t\t\t ptype \u0026 ~IPVS_OPT_F_PARAM);\n1157:\t\t\t\t\tretc = 20;\n1158:\t\t\t\t\tgoto out;\n1159:\t\t\t\t}\n1160:\t\t\t}\n1161:\t\t\tp += plen; / Next option /\n1162:\t\t}\n1163:\t\n1164:\t\t/ Get flags and Mask off unsupported */\n1165:\t\tflags = ntohl(s-\u003ev4.flags);\n1166:\t\tif (!ip_vs_sync_validate_flags(flags)) {\n1167:\t\t\tIP_VS_DBG(3, \"BACKUP, Invalid flags 0x%X\\n\", flags);\n1168:\t\t\tretc = 25;\n1169:\t\t\tgoto out;\n1170:\t\t}\n1171:\t\tflags \u0026= IP_VS_CONN_F_BACKUP_MASK;\n1172:\t\tflags \|= IP_VS_CONN_F_SYNC;\n1173:\t\tstate = ntohs(s-\u003ev4.state);\n1174:\t\n1175:\t\tif (!(flags \u0026 IP_VS_CONN_F_TEMPLATE)) {\n1176:\t\t\tpp = ip_vs_proto_get(s-\u003ev4.protocol);\n1177:\t\t\tif (!pp) {\n1178:\t\t\t\tIP_VS_DBG(3,\"BACKUP, Unsupported protocol %u\\n\",\n1179:\t\t\t\t\ts-\u003ev4.protocol);\n" }
41/3	2026/09/11 18:48	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7052 output: 23 thoughts: 23 Thoughts: Here's my summary, as though I'm thinking through this: Digging into the History Okay, so I need to understand the rationale behind this particular change. My first instinct is to dive into the git history. A simple `git log` on this commit should be my go-to. I want to see what the commit message says – was it a bug fix? Was it introducing a new feature? What was the context? The commit message should give me the crucial high-level overview. From there, I'll be able to quickly understand the impact this change had, and why the change was made in the first place. I'm really hoping there's a good description, maybe even a link to a ticket. This is the fastest way to get to the root of the reasoning.
42/3	2026/09/11 18:48	tool	grepper	0m Args: { "Expression": "ip_vs_sync_validate_flags" } Results: { "Output": "net/netfilter/ipvs/ip_vs_sync.c=841=static void ip_vs_proc_conn(struct netns_ipvs ipvs, struct ip_vs_conn_param param,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-952-/* Check for incompatible flags /\nnet/netfilter/ipvs/ip_vs_sync.c:953:static bool ip_vs_sync_validate_flags(u32 flags)\nnet/netfilter/ipvs/ip_vs_sync.c-954-{\n--\nnet/netfilter/ipvs/ip_vs_sync.c=970=static void ip_vs_process_message_v0(struct netns_ipvs ipvs, const char buffer,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1002-\nnet/netfilter/ipvs/ip_vs_sync.c:1003:\t\tif (!ip_vs_sync_validate_flags(flags)) {\nnet/netfilter/ipvs/ip_vs_sync.c-1004-\t\t\tIP_VS_DBG(2, \"BACKUP v0, Invalid flags 0x%X\\n\", flags);\n--\nnet/netfilter/ipvs/ip_vs_sync.c=1087=static inline int ip_vs_proc_sync_conn(struct netns_ipvs ipvs, __u8 p, __u8 msg_end)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-1165-\tflags = ntohl(s-\u003ev4.flags);\nnet/netfilter/ipvs/ip_vs_sync.c:1166:\tif (!ip_vs_sync_validate_flags(flags)) {\nnet/netfilter/ipvs/ip_vs_sync.c-1167-\t\tIP_VS_DBG(3, \"BACKUP, Invalid flags 0x%X\\n\", flags);\n" }
43/3	2026/09/11 18:48	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7764 output: 39 thoughts: 137 Thoughts: Investigating IPVS Connection Flags Okay, so I'm looking at this code and I need to understand the impact of certain connection flags. Specifically, I need to figure out the implications if either `IP_VS_CONN_F_TEMPLATE \| IP_VS_CONN_F_NO_CPORT` or `IP_VS_CONN_F_ONE_PACKET` was set earlier. My initial thought is to trace the history and see what changes or bugs prompted their introduction or modification. It would be ideal if I had direct access to a `git` command for a quick history check, but that's not available. No worries, I can work with the diff. Time to dive into the kernel source, specifically `net/netfilter/ipvs` and examine the definitions and usage of `IP_VS_CONN_F_NO_CPORT` and `IP_VS_CONN_F_ONE_PACKET` to get the whole picture. I'm sure I'll find what I need there.
44/3	2026/09/11 18:48	tool	grepper	0m Args: { "Expression": "IP_VS_CONN_F_NO_CPORT", "PathPrefix": "net/netfilter/ipvs" } Results: { "Output": "net/netfilter/ipvs/ip_vs_conn.c=367=__ip_vs_conn_in_get(const struct ip_vs_conn_param p)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-395-\t\t\t\t (!p-\u003ecport ^\nnet/netfilter/ipvs/ip_vs_conn.c:396:\t\t\t\t (!(cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT))) \u0026\u0026\nnet/netfilter/ipvs/ip_vs_conn.c-397-\t\t\t\t p-\u003eprotocol == cp-\u003eprotocol) {\n--\nnet/netfilter/ipvs/ip_vs_conn.c=643=void ip_vs_conn_fill_cport(struct ip_vs_conn cp, __be16 cport)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-684-\t\t\tspin_lock_bh(\u0026cp-\u003elock);\nnet/netfilter/ipvs/ip_vs_conn.c:685:\t\t\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT \u0026\u0026 by_me)\nnet/netfilter/ipvs/ip_vs_conn.c-686-\t\t\t\tcp-\u003ecport = 0;\n--\nnet/netfilter/ipvs/ip_vs_conn.c-757-\t/* Fill cport once, even if multiple packets try to do it /\nnet/netfilter/ipvs/ip_vs_conn.c:758:\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT \u0026\u0026 (!cp-\u003ecport \|\| by_me)) {\nnet/netfilter/ipvs/ip_vs_conn.c-759-\t\t/ If we race with resizing make sure cport is set for dir 1 /\n--\nnet/netfilter/ipvs/ip_vs_conn.c-765-\t\t\tatomic_dec(\u0026ipvs-\u003eno_cport_conns[af_id]);\nnet/netfilter/ipvs/ip_vs_conn.c:766:\t\t\tcp-\u003eflags \u0026= ~IP_VS_CONN_F_NO_CPORT;\nnet/netfilter/ipvs/ip_vs_conn.c-767-\t\t}\n--\nnet/netfilter/ipvs/ip_vs_conn.c=875=struct ip_vs_rht ip_vs_conn_tab_alloc(struct netns_ipvs ipvs, int buckets,\n--\nnet/netfilter/ipvs/ip_vs_conn.c-882-\tscounts = clamp(buckets \u003e\u003e 6, 1, 256);\nnet/netfilter/ipvs/ip_vs_conn.c:883:\t/ locks: based on parallel IP_VS_CONN_F_NO_CPORT operations + resize /\nnet/netfilter/ipvs/ip_vs_conn.c-884-\tlocks = clamp(8, 1, scounts);\n--\nnet/netfilter/ipvs/ip_vs_conn.c=1347=static void ip_vs_conn_expire(struct timer_list t)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1394-\t\tip_vs_unbind_dest(cp);\nnet/netfilter/ipvs/ip_vs_conn.c:1395:\t\tif (unlikely(cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT)) {\nnet/netfilter/ipvs/ip_vs_conn.c-1396-\t\t\tint af_id = ip_vs_af_index(cp-\u003eaf);\n--\nnet/netfilter/ipvs/ip_vs_conn.c=1444=ip_vs_conn_new(const struct ip_vs_conn_param p, int dest_af,\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1516-\nnet/netfilter/ipvs/ip_vs_conn.c:1517:\tif (unlikely(flags \u0026 IP_VS_CONN_F_NO_CPORT)) {\nnet/netfilter/ipvs/ip_vs_conn.c-1518-\t\tint af_id = ip_vs_af_index(cp-\u003eaf);\n--\nnet/netfilter/ipvs/ip_vs_ftp.c=254=static int ip_vs_ftp_out(struct ip_vs_app app, struct ip_vs_conn cp,\n--\nnet/netfilter/ipvs/ip_vs_ftp.c-337-\t\tn_cp = ip_vs_conn_new(\u0026p, cp-\u003eaf, \u0026from, port,\nnet/netfilter/ipvs/ip_vs_ftp.c:338:\t\t\t\t IP_VS_CONN_F_NO_CPORT \|\nnet/netfilter/ipvs/ip_vs_ftp.c-339-\t\t\t\t IP_VS_CONN_F_NFCT,\n--\nnet/netfilter/ipvs/ip_vs_sync.c=953=static bool ip_vs_sync_validate_flags(u32 flags)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-957-\t /\nnet/netfilter/ipvs/ip_vs_sync.c:958:\tif (flags \u0026 IP_VS_CONN_F_NO_CPORT) {\nnet/netfilter/ipvs/ip_vs_sync.c-959-\t\tif (flags \u0026 IP_VS_CONN_F_TEMPLATE)\n--\nnet/netfilter/ipvs/ip_vs_xmit.c=787=ip_vs_nat_xmit(struct sk_buff skb, struct ip_vs_conn cp,\n--\nnet/netfilter/ipvs/ip_vs_xmit.c-793-\t/* check if it is a connection of no-client-port /\nnet/netfilter/ipvs/ip_vs_xmit.c:794:\tif (unlikely(cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT)) {\nnet/netfilter/ipvs/ip_vs_xmit.c-795-\t\t__be16 _pt, p;\n--\nnet/netfilter/ipvs/ip_vs_xmit.c=871=ip_vs_nat_xmit_v6(struct sk_buff skb, struct ip_vs_conn cp,\n--\nnet/netfilter/ipvs/ip_vs_xmit.c-877-\t/* check if it is a connection of no-client-port /\nnet/netfilter/ipvs/ip_vs_xmit.c:878:\tif (unlikely(cp-\u003eflags \u0026 IP_VS_CONN_F_NO_CPORT \u0026\u0026 !ipvsh-\u003efragoffs)) {\nnet/netfilter/ipvs/ip_vs_xmit.c-879-\t\t__be16 _pt, p;\n" }
45/3	2026/09/11 18:48	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 9864 output: 39 thoughts: 22 Thoughts: Okay, here's my interpretation of that thought process, assuming I'm already deep in the weeds of network performance analysis: Analyzing Network Traffic: The Importance of Single-Packet Observations Alright, so I'm digging into this network data and immediately my brain hones in on something interesting: `IP_VS_CONN_F_ONE_PACKET`. This is key. It's a flag, an indicator, a datapoint that's going to be crucial for understanding the entire picture. I immediately recognize this means that the connection is related to the very first packet of a specific data stream or conversation, in other words, that there is only one packet involved. It's not just another data point; it's a vital piece of the puzzle. This helps me narrow down possible issues, potential bottlenecks, or unique behavior. This single observation is the first thing I need to investigate in order to understand the broader context.
46/3	2026/09/11 18:48	tool	grepper	0m Args: { "Expression": "IP_VS_CONN_F_ONE_PACKET", "PathPrefix": "net/netfilter/ipvs" } Results: { "Output": "net/netfilter/ipvs/ip_vs_conn.c=261=static inline int ip_vs_conn_hash(struct ip_vs_conn cp)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-270-\nnet/netfilter/ipvs/ip_vs_conn.c:271:\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET)\nnet/netfilter/ipvs/ip_vs_conn.c-272-\t\treturn 0;\n--\nnet/netfilter/ipvs/ip_vs_conn.c=316=static inline bool ip_vs_conn_unlink(struct ip_vs_conn cp)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-324-\nnet/netfilter/ipvs/ip_vs_conn.c:325:\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET)\nnet/netfilter/ipvs/ip_vs_conn.c-326-\t\treturn refcount_dec_if_one(\u0026cp-\u003erefcnt);\n--\nnet/netfilter/ipvs/ip_vs_conn.c=620=static void __ip_vs_conn_put_timer(struct ip_vs_conn cp)\nnet/netfilter/ipvs/ip_vs_conn.c-621-{\nnet/netfilter/ipvs/ip_vs_conn.c:622:\tunsigned long t = (cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET) ?\nnet/netfilter/ipvs/ip_vs_conn.c-623-\t\t0 : cp-\u003etimeout;\n--\nnet/netfilter/ipvs/ip_vs_conn.c=629=void ip_vs_conn_put(struct ip_vs_conn cp)\nnet/netfilter/ipvs/ip_vs_conn.c-630-{\nnet/netfilter/ipvs/ip_vs_conn.c:631:\tif ((cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET) \u0026\u0026\nnet/netfilter/ipvs/ip_vs_conn.c-632-\t (refcount_read(\u0026cp-\u003erefcnt) == 1) \u0026\u0026\n--\nnet/netfilter/ipvs/ip_vs_conn.c=1089=ip_vs_bind_dest(struct ip_vs_conn cp, struct ip_vs_dest dest)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1102-\tif (cp-\u003eprotocol != IPPROTO_UDP)\nnet/netfilter/ipvs/ip_vs_conn.c:1103:\t\tconn_flags \u0026= ~IP_VS_CONN_F_ONE_PACKET;\nnet/netfilter/ipvs/ip_vs_conn.c-1104-\tflags = cp-\u003eflags;\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1107-\t\t/* Synced conns are hashed, so they can not get this flag /\nnet/netfilter/ipvs/ip_vs_conn.c:1108:\t\tconn_flags \u0026= ~IP_VS_CONN_F_ONE_PACKET;\nnet/netfilter/ipvs/ip_vs_conn.c-1109-\n--\nnet/netfilter/ipvs/ip_vs_conn.c=1347=static void ip_vs_conn_expire(struct timer_list t)\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1381-\t\tif ((cp-\u003eflags \u0026 IP_VS_CONN_F_NFCT) \u0026\u0026\nnet/netfilter/ipvs/ip_vs_conn.c:1382:\t\t !(cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET)) {\nnet/netfilter/ipvs/ip_vs_conn.c-1383-\t\t\t/* Do not access conntracks during subsys cleanup\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1399-\t\t}\nnet/netfilter/ipvs/ip_vs_conn.c:1400:\t\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET)\nnet/netfilter/ipvs/ip_vs_conn.c-1401-\t\t\tip_vs_conn_rcu_free(\u0026cp-\u003ercu_head);\n--\nnet/netfilter/ipvs/ip_vs_conn.c=1444=ip_vs_conn_new(const struct ip_vs_conn_param p, int dest_af,\n--\nnet/netfilter/ipvs/ip_vs_conn.c-1547-\t Sometimes keeping conntrack can be useful for\nnet/netfilter/ipvs/ip_vs_conn.c:1548:\t * IP_VS_CONN_F_ONE_PACKET too.\nnet/netfilter/ipvs/ip_vs_conn.c-1549-\t /\n--\nnet/netfilter/ipvs/ip_vs_core.c=430=ip_vs_sched_persist(struct ip_vs_service svc,\n--\nnet/netfilter/ipvs/ip_vs_core.c-568-\t\t \u0026\u0026 iph-\u003eprotocol == IPPROTO_UDP) ?\nnet/netfilter/ipvs/ip_vs_core.c:569:\t\tIP_VS_CONN_F_ONE_PACKET : 0;\nnet/netfilter/ipvs/ip_vs_core.c-570-\n--\nnet/netfilter/ipvs/ip_vs_core.c=618=ip_vs_schedule(struct ip_vs_service svc, struct sk_buff skb,\n--\nnet/netfilter/ipvs/ip_vs_core.c-715-\t\t \u0026\u0026 iph-\u003eprotocol == IPPROTO_UDP) ?\nnet/netfilter/ipvs/ip_vs_core.c:716:\t\tIP_VS_CONN_F_ONE_PACKET : 0;\nnet/netfilter/ipvs/ip_vs_core.c-717-\n--\nnet/netfilter/ipvs/ip_vs_core.c=762=int ip_vs_leave(struct ip_vs_service svc, struct sk_buff skb,\n--\nnet/netfilter/ipvs/ip_vs_core.c-783-\t\t\t\t iph-\u003eprotocol == IPPROTO_UDP) ?\nnet/netfilter/ipvs/ip_vs_core.c:784:\t\t\t\t IP_VS_CONN_F_ONE_PACKET : 0;\nnet/netfilter/ipvs/ip_vs_core.c-785-\t\tunion nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } };\n--\nnet/netfilter/ipvs/ip_vs_core.c-810-\nnet/netfilter/ipvs/ip_vs_core.c:811:\t\tif ((cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET) \u0026\u0026 cp-\u003econtrol)\nnet/netfilter/ipvs/ip_vs_core.c-812-\t\t\tatomic_inc(\u0026cp-\u003econtrol-\u003ein_pkts);\n--\nnet/netfilter/ipvs/ip_vs_core.c=1309=struct ip_vs_conn ip_vs_new_conn_out(struct ip_vs_service svc,\n--\nnet/netfilter/ipvs/ip_vs_core.c-1365-\tflags = ((svc-\u003eflags \u0026 IP_VS_SVC_F_ONEPACKET) \u0026\u0026\nnet/netfilter/ipvs/ip_vs_core.c:1366:\t\t iph-\u003eprotocol == IPPROTO_UDP) ? IP_VS_CONN_F_ONE_PACKET : 0;\nnet/netfilter/ipvs/ip_vs_core.c-1367-\t/* create connection /\n--\nnet/netfilter/ipvs/ip_vs_core.c=2096=ip_vs_in_hook(void priv, struct sk_buff skb, const struct nf_hook_state state)\n--\nnet/netfilter/ipvs/ip_vs_core.c-2269-\nnet/netfilter/ipvs/ip_vs_core.c:2270:\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET)\nnet/netfilter/ipvs/ip_vs_core.c-2271-\t\tpkts = sysctl_sync_threshold(ipvs);\n--\nnet/netfilter/ipvs/ip_vs_core.c-2276-\t\tip_vs_sync_conn(ipvs, cp, pkts);\nnet/netfilter/ipvs/ip_vs_core.c:2277:\telse if ((cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET) \u0026\u0026 cp-\u003econtrol)\nnet/netfilter/ipvs/ip_vs_core.c-2278-\t\t/* increment is done inside ip_vs_sync_conn too /\n--\nnet/netfilter/ipvs/ip_vs_nfct.c=70=ip_vs_update_conntrack(struct sk_buff skb, struct ip_vs_conn cp, int outin)\n--\nnet/netfilter/ipvs/ip_vs_nfct.c-84-\t/ Never alter conntrack for OPS conns (no reply is expected) /\nnet/netfilter/ipvs/ip_vs_nfct.c:85:\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET)\nnet/netfilter/ipvs/ip_vs_nfct.c-86-\t\treturn;\n--\nnet/netfilter/ipvs/ip_vs_sync.c=539=static void ip_vs_sync_conn_v0(struct netns_ipvs ipvs, struct ip_vs_conn cp,\n--\nnet/netfilter/ipvs/ip_vs_sync.c-551-\t/ Do not sync ONE PACKET /\nnet/netfilter/ipvs/ip_vs_sync.c:552:\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET)\nnet/netfilter/ipvs/ip_vs_sync.c-553-\t\treturn;\n--\nnet/netfilter/ipvs/ip_vs_sync.c=629=void ip_vs_sync_conn(struct netns_ipvs ipvs, struct ip_vs_conn cp, int pkts)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-644-\t/ Do not sync ONE PACKET */\nnet/netfilter/ipvs/ip_vs_sync.c:645:\tif (cp-\u003eflags \u0026 IP_VS_CONN_F_ONE_PACKET)\nnet/netfilter/ipvs/ip_vs_sync.c-646-\t\tgoto control;\n--\nnet/netfilter/ipvs/ip_vs_sync.c=953=static bool ip_vs_sync_validate_flags(u32 flags)\n--\nnet/netfilter/ipvs/ip_vs_sync.c-961-\t}\nnet/netfilter/ipvs/ip_vs_sync.c:962:\tif (flags \u0026 IP_VS_CONN_F_ONE_PACKET)\nnet/netfilter/ipvs/ip_vs_sync.c-963-\t\treturn false;\n" }
47/3	2026/09/11 18:48	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 12964 output: 245 thoughts: 1518 Thoughts: KMSAN Assessment: IPVS Synchronization Daemon Flag Validation Alright, let's break this down. We're looking at a patch in `ip_vs_sync.c` which, from what I gather, concerns itself with validating connection flags within the IPVS synchronization daemon. Specifically, it seems like the code is responsible for receiving sync messages, likely UDP multicast, from other IPVS directors. These messages are parsed using `ip_vs_process_message_v0` and `ip_vs_proc_sync_conn` which in turn call the new `ip_vs_sync_validate_flags` function. The core of the patch is that `ip_vs_sync_validate_flags` performs these key checks: it's looking for the presence of `IP_VS_CONN_F_NO_CPORT` flag combined with `IP_VS_CONN_F_TEMPLATE`, or just `IP_VS_CONN_F_ONE_PACKET`. If either of these combinations exist, the packet is rejected. The flags are derived from the network buffer. Now, according to the guidelines, the use of KMSAN is reserved for cases involving uninitialized memory risks. So let's systematically analyze: 1. Uninitialized Memory: The flags come directly from network data, they aren't initialized locally. However, the code validates and rejects packets containing the "forbidden" flag combinations. No uninitialized data ever makes it past the input validation to be used in calculations. 2. User Space Exposure: No kernel data is exposed to user space directly because the patch performs input validation, and does not alter any kernel structures that are copied to userspace. 3. Conditional Logic & Uninitialized Variables: The logic is straightforward - validate the flags, and proceed or reject. The input flags themselves are not uninitialized, they come from the network. 4. Data Structure Allocation & Initialization: The patch does not introduce any new allocation or initialization of data structures, so we can disregard this aspect. 5. Bounds Checks & Lengths: Actually, the patch improves input validation of flags coming from the network, making it more difficult to cause any out-of-bounds reads or writes. The original bug, if one can call it that, was a potential for inconsistent state, refcount issues, or invalid handling resulting from incompatible combinations of flags in the network messages. These could possibly lead to crashes, panics, NULL dereferences or use-after-free conditions. However, none of that is directly related to uninitialized memory. We can assume that if these invalid flag combinations create issues, the standard bug detectors (KASAN, LOCKDEP, refcount checks) would catch these. Therefore, the patch does not introduce or expose uninitialized memory risks. Based on the guidelines, NeedsKMSAN should be false. ``` - NeedsKMSAN: false - KMSANReasoning: The patch adds validation for incompatible connection flags (`IP_VS_CONN_F_NO_CPORT` with `IP_VS_CONN_F_TEMPLATE`, and `IP_VS_CONN_F_ONE_PACKET`) in the IPVS synchronization message processing handlers (`ip_vs_process_message_v0` and `ip_vs_proc_sync_conn`). The flags are parsed directly from incoming network packet buffers and validated before further connection state processing. The changes only introduce input validation and early exits, without allocating new memory, altering buffer sizes/boundaries, leaving fields uninitialized, or exposing kernel data to user space. Any bugs resulting from malformed connection states or flags (such as refcount issues or use-after-free) fall under the purview of standard detectors like KASAN and refcount checking. There is no risk of uninitialized memory access or information leak, so a dedicated KMSAN fuzzing session is not warranted. ``` ``` set-results ```
48/3	2026/09/11 18:49	tool	set-results	0m Args: { "KMSANReasoning": "The patch introduces flag validation (`ip_vs_sync_validate_flags`) in the IPVS synchronization message handling functions (`ip_vs_process_message_v0` and `ip_vs_proc_sync_conn`) to reject invalid flag combinations (e.g., `IP_VS_CONN_F_ONE_PACKET` or `IP_VS_CONN_F_NO_CPORT` combined with `IP_VS_CONN_F_TEMPLATE`). The flags variable is directly initialized from received network packet data (`ntohs` / `ntohl`), and the validation logic only adds early rejection of invalid sync messages. No heap/stack memory allocations are introduced or modified, no buffer length calculations or copying to user space are altered, and no uninitialized variables or struct padding are read or exposed. Any potential issues stemming from incompatible flags (such as state inconsistencies, refcount errors, or use-after-free) are detectable by standard KASAN/refcount checks. Therefore, a dedicated KMSAN fuzzing session is not needed.", "NeedsKMSAN": false } Results: { "KMSANReasoning": "The patch introduces flag validation (`ip_vs_sync_validate_flags`) in the IPVS synchronization message handling functions (`ip_vs_process_message_v0` and `ip_vs_proc_sync_conn`) to reject invalid flag combinations (e.g., `IP_VS_CONN_F_ONE_PACKET` or `IP_VS_CONN_F_NO_CPORT` combined with `IP_VS_CONN_F_TEMPLATE`). The flags variable is directly initialized from received network packet data (`ntohs` / `ntohl`), and the validation logic only adds early rejection of invalid sync messages. No heap/stack memory allocations are introduced or modified, no buffer length calculations or copying to user space are altered, and no uninitialized variables or struct padding are read or exposed. Any potential issues stemming from incompatible flags (such as state inconsistencies, refcount errors, or use-after-free) are detectable by standard KASAN/refcount checks. Therefore, a dedicated KMSAN fuzzing session is not needed.", "NeedsKMSAN": false }

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)