From 3c9d4917fe6e4fa505e43277a61ed1b525335fd3 Mon Sep 17 00:00:00 2001
From: Wei Xing <skyxwwalker@gmail.com>
Date: Mon, 18 Dec 2023 02:16:09 +0800
Subject: [PATCH]  Add the socket option IPV6_MULTICAST_LOOP to prevent the
 interface from autoconfiguring using RA messages sent by itself.

---
 socket.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/socket.c b/socket.c
index 849ed744..547fe939 100644
--- a/socket.c
+++ b/socket.c
@@ -65,6 +65,13 @@ int open_icmpv6_socket(void)
 		flog(LOG_ERR, "setsockopt(IPV6_MULTICAST_HOPS): %s", strerror(errno));
 		return -1;
 	}
+
+        err = setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, (int[]){0}, sizeof(int));
+        if (err < 0) {
+                flog(LOG_ERR, "setsockopt(IPV6_MULTICAST_LOOP): %s", strerror(errno));
+                return -1;
+        }
+
 #ifdef IPV6_RECVHOPLIMIT
 	err = setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, (int[]){1}, sizeof(int));
 	if (err < 0) {