Merge pull request #18618 from FRRouting/mergify/bp/stable/10.3/pr-18583

babeld: check valid babel port (backport #18583)

2 files changed, 6 insertions, 0 deletions

diff --git a/babeld/babeld.c b/babeld/babeld.c
index 1d2f60e3ad..2c9c9f031e 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))