commit 8bd170750400bfa5e14c3dd2e2d0f305e1ab0e57
author Herbert Xu <herbert@gondor.apana.org.au> Wed Oct 10 15:41:41 2007 -0700
committer David S. Miller <davem@sunset.davemloft.net> Wed Oct 10 16:55:53 2007 -0700
tree f8634014eb4a66bafdada8865df94713277b72c8
parent f24e3d658cf382f11a7aa7887fa99147bdc6fe0b

[IPSEC] esp: Remove NAT-T checksum invalidation for BEET

I pointed this out back when this patch was first proposed but it looks like
it got lost along the way.

The checksum only needs to be ignored for NAT-T in transport mode where
we lose the original inner addresses due to NAT.  With BEET the inner
addresses will be intact so the checksum remains valid.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/esp4.c

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 452910d..1af332d 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -261,8 +261,7 @@
 		 *    as per draft-ietf-ipsec-udp-encaps-06,
 		 *    section 3.1.2
 		 */
-		if (x->props.mode == XFRM_MODE_TRANSPORT ||
-		    x->props.mode == XFRM_MODE_BEET)
+		if (x->props.mode == XFRM_MODE_TRANSPORT)
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
 	}