[IPSEC]: Move ip_summed zapping out of xfrm6_rcv_spi

Not every transform needs to zap ip_summed.  For example, a pure tunnel
mode encapsulation does not affect the hardware checksum at all.  In fact,
every algorithm (that needs this) other than AH6 already does its own
ip_summed zapping.

This patch moves the zapping into AH6 which is in line with what IPv4 does.

Possible future optimisation: Checksum the data as we copy them in IPComp.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index f9f689162692..a8221d1da0ff 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -344,6 +344,8 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
             pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
                 goto out;
 
+        skb->ip_summed = CHECKSUM_NONE;
+
         hdr_len = skb->data - skb_network_header(skb);
         ah = (struct ip_auth_hdr *)skb->data;
         ahp = x->data;