From 6f88868f325f0269198fb8e0c00b40a7bbe0e53f Mon Sep 17 00:00:00 2001
From: zmw12306 <zmw12306@gmail.com>
Date: Sat, 5 Apr 2025 15:14:12 -0400
Subject: [PATCH] babeld: check valid babel port

Add checking for port == 6696.

Signed-off-by: zmw12306 <zmw12306@gmail.com>
---
 babeld/babeld.c | 4 ++++
 babeld/babeld.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/babeld/babeld.c b/babeld/babeld.c
index 4e68f05df4..2050c84582 100644
--- a/babeld/babeld.c
+++ b/babeld/babeld.c
@@ -183,6 +183,10 @@ static void babel_read_protocol(struct event *thread)
             flog_err_sys(EC_LIB_SOCKET, "recv: %s", safe_strerror(errno));
         }
     } else {
+        if(ntohs(sin6.sin6_port) != BABEL_PORT) {
+            return;
+        }
+
         FOR_ALL_INTERFACES(vrf, ifp) {
             if(!if_up(ifp))
                 continue;
diff --git a/babeld/babeld.h b/babeld/babeld.h
index 17a0381d2c..f4ee09a761 100644
--- a/babeld/babeld.h
+++ b/babeld/babeld.h
@@ -21,6 +21,8 @@ Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
 #undef MAX
 #undef MIN
 
+#define BABEL_PORT 6696
+
 #define MAX(x,y) ((x)<=(y)?(y):(x))
 #define MIN(x,y) ((x)<=(y)?(x):(y))
 
-- 
2.39.5