RDMA/cma: Add IPv6 support

Handle AF_INET6 cases where required, and use struct sockaddr_storage
wherever an IPv6 address might be stored.
Signed-off-by: Aleksey Senin <aleksey@alst60.(none)>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/cma.c

@@ -42,6 +42,7 @@
 #include <linux/inetdevice.h>
 
 #include <net/tcp.h>
+#include <net/ipv6.h>
 
 #include <rdma/rdma_cm.h>
 #include <rdma/rdma_cm_ib.h>
@@ -636,7 +637,12 @@ static inline int cma_zero_addr(struct sockaddr *addr)
 
 static inline int cma_loopback_addr(struct sockaddr *addr)
 {
-	return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
+	if (addr->sa_family == AF_INET)
+		return ipv4_is_loopback(
+			((struct sockaddr_in *) addr)->sin_addr.s_addr);
+	else
+		return ipv6_addr_loopback(
+			&((struct sockaddr_in6 *) addr)->sin6_addr);
 }
 
 static inline int cma_any_addr(struct sockaddr *addr)
@@ -1467,10 +1473,10 @@ static void cma_listen_on_all(struct rdma_id_private *id_priv)
 
 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
 {
-	struct sockaddr_in addr_in;
+	struct sockaddr_storage addr_in;
 
 	memset(&addr_in, 0, sizeof addr_in);
-	addr_in.sin_family = af;
+	addr_in.ss_family = af;
 	return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
 }
 
@@ -2073,7 +2079,7 @@ int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
 	struct rdma_id_private *id_priv;
 	int ret;
 
-	if (addr->sa_family != AF_INET)
+	if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
 		return -EAFNOSUPPORT;
 
 	id_priv = container_of(id, struct rdma_id_private, id);
@@ -2113,31 +2119,59 @@ EXPORT_SYMBOL(rdma_bind_addr);
 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
 			  struct rdma_route *route)
 {
-	struct sockaddr_in *src4, *dst4;
 	struct cma_hdr *cma_hdr;
 	struct sdp_hh *sdp_hdr;
 
-	src4 = (struct sockaddr_in *) &route->addr.src_addr;
-	dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
-
-	switch (ps) {
-	case RDMA_PS_SDP:
-		sdp_hdr = hdr;
-		if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
-			return -EINVAL;
-		sdp_set_ip_ver(sdp_hdr, 4);
-		sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
-		sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
-		sdp_hdr->port = src4->sin_port;
-		break;
-	default:
-		cma_hdr = hdr;
-		cma_hdr->cma_version = CMA_VERSION;
-		cma_set_ip_ver(cma_hdr, 4);
-		cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
-		cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
-		cma_hdr->port = src4->sin_port;
-		break;
+	if (route->addr.src_addr.ss_family == AF_INET) {
+		struct sockaddr_in *src4, *dst4;
+
+		src4 = (struct sockaddr_in *) &route->addr.src_addr;
+		dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
+
+		switch (ps) {
+		case RDMA_PS_SDP:
+			sdp_hdr = hdr;
+			if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
+				return -EINVAL;
+			sdp_set_ip_ver(sdp_hdr, 4);
+			sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
+			sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
+			sdp_hdr->port = src4->sin_port;
+			break;
+		default:
+			cma_hdr = hdr;
+			cma_hdr->cma_version = CMA_VERSION;
+			cma_set_ip_ver(cma_hdr, 4);
+			cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
+			cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
+			cma_hdr->port = src4->sin_port;
+			break;
+		}
+	} else {
+		struct sockaddr_in6 *src6, *dst6;
+
+		src6 = (struct sockaddr_in6 *) &route->addr.src_addr;
+		dst6 = (struct sockaddr_in6 *) &route->addr.dst_addr;
+
+		switch (ps) {
+		case RDMA_PS_SDP:
+			sdp_hdr = hdr;
+			if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
+				return -EINVAL;
+			sdp_set_ip_ver(sdp_hdr, 6);
+			sdp_hdr->src_addr.ip6 = src6->sin6_addr;
+			sdp_hdr->dst_addr.ip6 = dst6->sin6_addr;
+			sdp_hdr->port = src6->sin6_port;
+			break;
+		default:
+			cma_hdr = hdr;
+			cma_hdr->cma_version = CMA_VERSION;
+			cma_set_ip_ver(cma_hdr, 6);
+			cma_hdr->src_addr.ip6 = src6->sin6_addr;
+			cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
+			cma_hdr->port = src6->sin6_port;
+			break;
+		}
 	}
 	return 0;
 }