lib: add sockopt helper for setting IPV6_V6ONLY and use it
getaddrinfo returns a list of socket parameters for listening. it
will contain both IPv4 and IPv6 listening sockets. unless we use
IPV6_V6ONLY on the IPv6 ones, only the socket listed first will
work. if the IPv4 one came first, the IPv6 one would get an
"Address in use" error.
this functionality was already present for bgpd and its listening
sockets. as it is needed for vtys as well, make it a common helper.
Conflicts:
lib/sockunion.c
diff --git a/lib/sockunion.c b/lib/sockunion.c
index 27a7ab0..5977052 100644
--- a/lib/sockunion.c
+++ b/lib/sockunion.c
@@ -566,6 +566,30 @@
return -1;
}
+int
+sockopt_v6only (int family, int sock)
+{
+ int ret, on = 1;
+
+#ifdef HAVE_IPV6
+#ifdef IPV6_V6ONLY
+ if (family == AF_INET6)
+ {
+ ret = setsockopt (sock, IPPROTO_IPV6, IPV6_V6ONLY,
+ (void *) &on, sizeof (int));
+ if (ret < 0)
+ {
+ zlog (NULL, LOG_WARNING, "can't set sockopt IPV6_V6ONLY "
+ "to socket %d", sock);
+ return -1;
+ }
+ return 0;
+ }
+#endif /* IPV6_V6ONLY */
+#endif /* HAVE_IPV6 */
+ return 0;
+}
+
/* If same family and same prefix return 1. */
int
sockunion_same (union sockunion *su1, union sockunion *su2)