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

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Message-Id: <20160612234814.15460-2-blair.steven@alliedtelesis.co.nz>
Date:	Mon, 13 Jun 2016 11:48:14 +1200
From:	Blair Steven <blair.steven@...iedtelesis.co.nz>
To:	netdev@...r.kernel.org
Cc:	Blair Steven <blair.steven@...iedtelesis.co.nz>
Subject: [PATCH] esp: correct offset for ESN when using NAT-T

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