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Commit 828b2b44 authored by Stephen Suryaputra's avatar Stephen Suryaputra Committed by David S. Miller
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ipv4: Multipath hashing on inner L3 needs to consider inner IPv6 pkts 



Commit 363887a2 ("ipv4: Support multipath hashing on inner IP pkts
for GRE tunnel") supports multipath policy value of 2, Layer 3 or inner
Layer 3 if present, but it only considers inner IPv4. There is a use
case of IPv6 is tunneled by IPv4 GRE, thus add the ability to hash on
inner IPv6 addresses.

Fixes: 363887a2 ("ipv4: Support multipath hashing on inner IP pkts for GRE tunnel")
Signed-off-by: default avatarStephen Suryaputra <ssuryaextr@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent faf5577f

net/ipv4/route.c

+17 −4
Original line number Diff line number Diff line
@@ -1964,17 +1964,30 @@ int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, 
		break;

	case 2:

		memset(&hash_keys, 0, sizeof(hash_keys));

		hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;

		/* skb is currently provided only when forwarding */

		if (skb) {

			struct flow_keys keys;



			skb_flow_dissect_flow_keys(skb, &keys, 0);



			/* Inner can be v4 or v6 */

			if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {

				hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;

				hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src;

				hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst;

			} else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {

				hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;

				hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src;

				hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst;

				hash_keys.tags.flow_label = keys.tags.flow_label;

				hash_keys.basic.ip_proto = keys.basic.ip_proto;

			} else {

				/* Same as case 0 */

				hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;

				ip_multipath_l3_keys(skb, &hash_keys);

			}

		} else {

			/* Same as case 0 */

			hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;

			hash_keys.addrs.v4addrs.src = fl4->saddr;

			hash_keys.addrs.v4addrs.dst = fl4->daddr;

		}