selinux: handle ICMPv6 consistently with ICMP

commit 79c8b348f215 ("selinux: support distinctions among all network
address families") mapped datagram ICMP sockets to the new icmp_socket
security class, but left ICMPv6 sockets unchanged.  This change fixes
that oversight to handle both kinds of sockets consistently.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/selinux/hooks.c

@@ -1295,7 +1295,8 @@ static inline u16 socket_type_to_security_class(int family, int type, int protoc
 		case SOCK_DGRAM:
 			if (default_protocol_dgram(protocol))
 				return SECCLASS_UDP_SOCKET;
-			else if (extsockclass && protocol == IPPROTO_ICMP)
+			else if (extsockclass && (protocol == IPPROTO_ICMP ||
+						  protocol == IPPROTO_ICMPV6))
 				return SECCLASS_ICMP_SOCKET;
 			else
 				return SECCLASS_RAWIP_SOCKET;