diff mbox series

[ipsec-next,4/7] xfrm: add route lookup to xfrm4_rcv_encap

Message ID aa7233431bb1b7791c8da7c61ad164d4bba9033d.1566395202.git.sd@queasysnail.net
State Awaiting Upstream
Delegated to: David Miller
Headers show
Series ipsec: add TCP encapsulation support (RFC 8229) | expand

Commit Message

Sabrina Dubroca Aug. 21, 2019, 9:46 p.m. UTC 
At this point, with TCP encapsulation, the dst may be gone, but
xfrm_input needs one.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
---
 net/ipv4/xfrm4_protocol.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/net/ipv4/xfrm4_protocol.c b/net/ipv4/xfrm4_protocol.c
index bcab48944c15..1665e1a05ec5 100644
--- a/net/ipv4/xfrm4_protocol.c
+++ b/net/ipv4/xfrm4_protocol.c
@@ -76,6 +76,14 @@  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;
@@ -83,6 +91,7 @@  int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
 out:
 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
 
+drop:
 	kfree_skb(skb);
 	return 0;
 }