From: Roy Marples <roy@marples.name>
Date: Tue, 23 Apr 2019 18:54:39 +0000 (+0000)
Subject: sun: Bind IPv6ND socket to interface.
X-Git-Tag: v7.2.1~11
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6fcd7ff4a7e39b7e80c2c1babe7fc150ef7e1efe;p=thirdparty%2Fdhcpcd.git

sun: Bind IPv6ND socket to interface.

Just to be on the safe side as it is per interface ....
---

diff --git a/src/ipv6nd.c b/src/ipv6nd.c
index a0fd4185..e8a06182 100644
--- a/src/ipv6nd.c
+++ b/src/ipv6nd.c
@@ -242,6 +242,7 @@ ipv6nd_open(struct interface *ifp)
 	    .ipv6mr_interface = ifp->index
 	};
 	struct rs_state *state = RS_STATE(ifp);
+	uint_t ifindex = ifp->index;
 
 	if (state->nd_fd != -1)
 		return state->nd_fd;
@@ -250,6 +251,13 @@ ipv6nd_open(struct interface *ifp)
 	if (s == -1)
 		return -1;
 
+	if (setsockopt(s, IPPROTO_IPV6, IPV6_BOUND_IF,
+	    &ifindex, sizeof(ifindex)) == -1)
+	{
+		close(s);
+		return -1;
+	}
+
 	if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP,
 	    &mreq, sizeof(mreq)) == -1)
 	{