Convert usage of IN_MULTICAST to ipv4_is_multicast

IN_MULTICAST's primary intent is as a uapi macro.

Elsewhere in the kernel we use ipv4_is_multicast consistently.

This patch unifies linux's multicast checks to use that function
rather than this macro.

Signed-off-by: Dave Taht <[e-mail]>
Reviewed-by: Toke Høiland-Jørgensen <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/geneve.c

···
 		info->key.u.ipv4.dst =
 			nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
 
-		if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
+		if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
 			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
 					    "Remote IPv4 address cannot be Multicast");
 			return -EINVAL;

include/net/vxlan.h

···
 	if (ipa->sa.sa_family == AF_INET6)
 		return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 	else
-		return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
+		return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
 }
 
 #else /* !IS_ENABLED(CONFIG_IPV6) */
···
 
 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 {
-	return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
+	return ipv4_is_multicast(ipa->sin.sin_addr.s_addr);
 }
 
 #endif /* IS_ENABLED(CONFIG_IPV6) */

net/rds/af_rds.c

···
 			ret = -EDESTADDRREQ;
 			break;
 		}
-		if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) ||
+		if (ipv4_is_multicast(sin->sin_addr.s_addr) ||
 		    sin->sin_addr.s_addr == htonl(INADDR_BROADCAST)) {
 			ret = -EINVAL;
 			break;
···
 			addr4 = sin6->sin6_addr.s6_addr32[3];
 			if (addr4 == htonl(INADDR_ANY) ||
 			    addr4 == htonl(INADDR_BROADCAST) ||
-			    IN_MULTICAST(ntohl(addr4))) {
+			    ipv4_is_multicast(addr4)) {
 				ret = -EPROTOTYPE;
 				break;
 			}

net/rds/bind.c

···
 		if (addr_len < sizeof(struct sockaddr_in) ||
 		    sin->sin_addr.s_addr == htonl(INADDR_ANY) ||
 		    sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
-		    IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
+		    ipv4_is_multicast(sin->sin_addr.s_addr))
 			return -EINVAL;
 		ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &v6addr);
 		binding_addr = &v6addr;
···
 			addr4 = sin6->sin6_addr.s6_addr32[3];
 			if (addr4 == htonl(INADDR_ANY) ||
 			    addr4 == htonl(INADDR_BROADCAST) ||
-			    IN_MULTICAST(ntohl(addr4)))
+			    ipv4_is_multicast(addr4))
 				return -EINVAL;
 		}
 		/* The scope ID must be specified for link local address. */

net/rds/send.c

···
 		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))) {
+			    ipv4_is_multicast(usin->sin_addr.s_addr)) {
 				ret = -EINVAL;
 				goto out;
 			}
···
 				addr4 = sin6->sin6_addr.s6_addr32[3];
 				if (addr4 == htonl(INADDR_ANY) ||
 				    addr4 == htonl(INADDR_BROADCAST) ||
-				    IN_MULTICAST(ntohl(addr4))) {
+				    ipv4_is_multicast(addr4)) {
 					ret = -EINVAL;
 					goto out;
 				}