Fix bug with Samba not recognising an 6to4 IPv6 interface.

"The 6to4 interface has the flags IFF_POINTTOPOINT interface but no
ifa_dstaddr as it's not at the IPv6 level a point to point interface
(at least from my understanding), as we don't have a IFF_BROADCAST
flag set (I have the impression that this flag is only set on a
interface that has also an IPv4 address) the first test is not valid
also, which result in a skipped interface."

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/socket/interfaces.c b/lib/socket/interfaces.c
index 618714d1a7..9bdecb243d 100644
--- a/lib/socket/interfaces.c
+++ b/lib/socket/interfaces.c
@@ -195,6 +195,19 @@ static int _get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
 			memcpy(&ifaces[total].bcast,
 				ifptr->ifa_dstaddr,
 				copy_size);
+#if defined(HAVE_IPV6)
+		} else if (ifptr->ifa_addr->sa_family == AF_INET6) {
+			const struct sockaddr_in6 *sin6 =
+				(const struct sockaddr_in6 *)ifptr->ifa_addr;
+			const struct in6_addr *in6 =
+				(const struct in6_addr *)&sin6->sin6_addr;
+
+			if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_V4COMPAT(in6)) {
+				continue;
+			}
+			/* IPv6 does not have broadcast it uses multicast. */
+			memset(&ifaces[total].bcast, '\0', copy_size);
+#endif
 		} else {
 			continue;
 		}