1 files changed, 54 insertions, 7 deletions

diff --git a/net/rds/send.c b/net/rds/send.c
index 6ed2e925c36a..9604e1faa564 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -1091,10 +1091,9 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
 			ret = -EINVAL;
 			goto out;
 		}
-		switch (namelen) {
-		case sizeof(*usin):
-			if (usin->sin_family != AF_INET ||
-			    usin->sin_addr.s_addr == htonl(INADDR_ANY) ||
+		switch (usin->sin_family) {
+		case AF_INET:
+			if (usin->sin_addr.s_addr == htonl(INADDR_ANY) ||
 			    usin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
 			    IN_MULTICAST(ntohl(usin->sin_addr.s_addr))) {
 				ret = -EINVAL;
@@ -1104,9 +1103,44 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
 			dport = usin->sin_port;
 			break;
 
-		case sizeof(*sin6): {
-			ret = -EPROTONOSUPPORT;
-			goto out;
+		case AF_INET6: {
+			int addr_type;
+
+			if (namelen < sizeof(*sin6)) {
+				ret = -EINVAL;
+				goto out;
+			}
+			addr_type = ipv6_addr_type(&sin6->sin6_addr);
+			if (!(addr_type & IPV6_ADDR_UNICAST)) {
+				__be32 addr4;
+
+				if (!(addr_type & IPV6_ADDR_MAPPED)) {
+					ret = -EINVAL;
+					goto out;
+				}
+
+				/* It is a mapped address.  Need to do some
+				 * sanity checks.
+				 */
+				addr4 = sin6->sin6_addr.s6_addr32[3];
+				if (addr4 == htonl(INADDR_ANY) ||
+				    addr4 == htonl(INADDR_BROADCAST) ||
+				    IN_MULTICAST(ntohl(addr4))) {
+					return -EINVAL;
+					goto out;
+				}
+			}
+			if (addr_type & IPV6_ADDR_LINKLOCAL) {
+				if (sin6->sin6_scope_id == 0) {
+					ret = -EINVAL;
+					goto out;
+				}
+				scope_id = sin6->sin6_scope_id;
+			}
+
+			daddr = sin6->sin6_addr;
+			dport = sin6->sin6_port;
+			break;
 		}
 
 		default:
@@ -1138,6 +1172,19 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
 			ret = -EOPNOTSUPP;
 			goto out;
 		}
+		/* If the socket is already bound to a link local address,
+		 * it can only send to peers on the same link.  But allow
+		 * communicating beween link local and non-link local address.
+		 */
+		if (scope_id != rs->rs_bound_scope_id) {
+			if (!scope_id) {
+				scope_id = rs->rs_bound_scope_id;
+			} else if (rs->rs_bound_scope_id) {
+				release_sock(sk);
+				ret = -EINVAL;
+				goto out;
+			}
+		}
 	}
 	release_sock(sk);