xfrm: add route lookup to xfrm4_rcv_encap

At this point, with TCP encapsulation, the dst may be gone, but xfrm_input needs one. Signed-off-by: Sabrina Dubroca <[email protected]> Acked-by: David S. Miller <[email protected]> Signed-off-by: Steffen Klassert <[email protected]>
jbg · Dec 9, 2019 · cac3c71 · cac3c71
1 parent 7b38019
commit cac3c71
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/net/ipv4/xfrm4_protocol.c b/net/ipv4/xfrm4_protocol.c
@@ -72,13 +72,22 @@ int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
 	if (!head)
 		goto out;
 
+	if (!skb_dst(skb)) {
+		const struct iphdr *iph = ip_hdr(skb);
+
+		if (ip_route_input_noref(skb, iph->daddr, iph->saddr,
+					 iph->tos, skb->dev))
+			goto drop;
+	}
+
 	for_each_protocol_rcu(*head, handler)
 		if ((ret = handler->input_handler(skb, nexthdr, spi, encap_type)) != -EINVAL)
 			return ret;
 
 out:
 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
 
+drop:
 	kfree_skb(skb);
 	return 0;
 }