[PATCH] esp: correct offset for ESN when using NAT-T

[Blair Steven]

The offset for calculating ESN was not taking into account the new UDP
header created for NAT-T.
---
 net/ipv4/esp4.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 4779374..c84d1fc 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -223,6 +223,8 @@ static int esp_output(struct xfrm_state *x, struct sk_buff 
*skb)
                uh->len = htons(skb->len - skb_transport_offset(skb));
                uh->check = 0;
 
+               skb_set_transport_header(skb, skb_transport_offset(skb) + 
sizeof(struct udphdr));
+
                switch (encap_type) {
                default:
                case UDP_ENCAP_ESPINUDP:
-- 
2.8.3