mctp: Allow keys matching any local address

Currently, we require an exact match on an incoming packet's dest
address, and the key's local_addr field.

In a future change, we may want to set up a key before packets are
routed, meaning we have no local address to match on.

This change allows key lookups to match on local_addr = MCTP_ADDR_ANY.

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mctp/route.c

@@ -76,7 +76,7 @@ static struct mctp_sock *mctp_lookup_bind(struct net *net, struct sk_buff *skb)
 static bool mctp_key_match(struct mctp_sk_key *key, mctp_eid_t local,
 			   mctp_eid_t peer, u8 tag)
 {
-	if (key->local_addr != local)
+	if (!mctp_address_matches(key->local_addr, local))
 		return false;
 
 	if (key->peer_addr != peer)
@@ -616,7 +616,7 @@ static struct mctp_sk_key *mctp_alloc_local_tag(struct mctp_sock *msk,
 			continue;
 
 		if (!(mctp_address_matches(tmp->peer_addr, daddr) &&
-		      tmp->local_addr == saddr))
+		      mctp_address_matches(tmp->local_addr, saddr)))
 			continue;
 
 		spin_lock(&tmp->lock);

net/mctp/test/route-test.c

@@ -645,6 +645,14 @@ static const struct mctp_route_input_sk_keys_test mctp_route_input_sk_keys_tests
 		.hdr = RX_HDR(1, 11, 8, FL_S | FL_E | FL_T(1)),
 		.deliver = true,
 	},
+	{
+		.name = "any local match",
+		.key_peer_addr = 12,
+		.key_local_addr = MCTP_ADDR_ANY,
+		.key_tag = 1,
+		.hdr = RX_HDR(1, 12, 8, FL_S | FL_E | FL_T(1)),
+		.deliver = true,
+	},
 };
 
 static void mctp_route_input_sk_keys_to_desc(