openvswitch: add tunnel protocol to sw_flow_key

Store tunnel protocol (AF_INET or AF_INET6) in sw_flow_key. This field now
also acts as an indicator whether the flow contains tunnel data (this was
previously indicated by tun_key.u.ipv4.dst being set but with IPv6 addresses
in an union with IPv4 ones this won't work anymore).

The new field was added to a hole in sw_flow_key.

Signed-off-by: Jiri Benc <[e-mail]>
Acked-by: Pravin B Shelar <[e-mail]>
Acked-by: Thomas Graf <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/openvswitch/flow.c

···
 {
 	/* Extract metadata from packet. */
 	if (tun_info) {
-		if (ip_tunnel_info_af(tun_info) != AF_INET)
-			return -EINVAL;
+		key->tun_proto = ip_tunnel_info_af(tun_info);
 		memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
 
 		if (tun_info->options_len) {
···
 			key->tun_opts_len = 0;
 		}
 	} else  {
+		key->tun_proto = 0;
 		key->tun_opts_len = 0;
 		memset(&key->tun_key, 0, sizeof(key->tun_key));
 	}

net/openvswitch/flow.h

···
 		u32	skb_mark;	/* SKB mark. */
 		u16	in_port;	/* Input switch port (or DP_MAX_PORTS). */
 	} __packed phy; /* Safe when right after 'tun_key'. */
+	u8 tun_proto;			/* Protocol of encapsulating tunnel. */
 	u32 ovs_flow_hash;		/* Datapath computed hash value.  */
 	u32 recirc_id;			/* Recirculation ID.  */
 	struct {

net/openvswitch/flow_netlink.c

···
 	}
 
 	SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
+	if (is_mask)
+		SW_FLOW_KEY_MEMSET_FIELD(match, tun_proto, 0xff, true);
+	else
+		SW_FLOW_KEY_PUT(match, tun_proto, AF_INET, false);
 
 	if (rem > 0) {
 		OVS_NLERR(log, "IPv4 tunnel attribute has %d unknown bytes.",
···
 			/* The userspace does not send tunnel attributes that
 			 * are 0, but we should not wildcard them nonetheless.
 			 */
-			if (match->key->tun_key.u.ipv4.dst)
+			if (match->key->tun_proto)
 				SW_FLOW_KEY_MEMSET_FIELD(match, tun_key,
 							 0xff, true);
 
···
 	if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
 		goto nla_put_failure;
 
-	if ((swkey->tun_key.u.ipv4.dst || is_mask)) {
+	if ((swkey->tun_proto || is_mask)) {
 		const void *opts = NULL;
 
 		if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
···
 
 	tun_info = &tun_dst->u.tun_info;
 	tun_info->mode = IP_TUNNEL_INFO_TX;
+	if (key.tun_proto == AF_INET6)
+		tun_info->mode |= IP_TUNNEL_INFO_IPV6;
 	tun_info->key = key.tun_key;
 
 	/* We need to store the options in the action itself since

net/openvswitch/flow_table.c

···
 
 static int flow_key_start(const struct sw_flow_key *key)
 {
-	if (key->tun_key.u.ipv4.dst)
+	if (key->tun_proto)
 		return 0;
 	else
 		return rounddown(offsetof(struct sw_flow_key, phy),