From 22ce0a1bf04c1b28c77d4abb7d089c3260d686be Mon Sep 17 00:00:00 2001
From: Yang Li <yang.li@transwarp.io>
Date: Thu, 17 Oct 2024 16:52:48 +0800
Subject: [PATCH] If sourceIP is antrea-gw0/fl4096, use standard vxlan

---
 tc_prog/tc_prog_kern.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tc_prog/tc_prog_kern.c b/tc_prog/tc_prog_kern.c
index 12004ed..8e0f223 100644
--- a/tc_prog/tc_prog_kern.c
+++ b/tc_prog/tc_prog_kern.c
@@ -273,6 +273,13 @@ int tc_init_in_func(struct __sk_buff *ctx) {
     if (eth->h_proto != bpf_htons(ETH_P_IP)) goto out;
     struct iphdr *iphdr = (struct iphdr *)(eth + 1);
 
+    unsigned int src_ip = iphdr->saddr;
+    src_ip = ntohl(src_ip);
+    unsigned int last_octet = src_ip & 0xFF;
+    if (last_octet == 1 || last_octet == 0) {
+        goto out;
+    }
+
     // We only learn the flow that is marked as 0x4
     if ((iphdr->tos & 0xc) != 0xc) goto out;
     ///////////////////////// Header/ifidx Learning ////////////////////