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xfrm6: Fix CHECKSUM_COMPLETE after IPv6 header push 

xfrm6_transport_finish rebuilds the IPv6 header based on the
original one and pushes it back without fixing skb->csum.
Therefore, CHECKSUM_COMPLETE is no longer valid and the packet
gets dropped.

Fix skb->csum by calling skb_postpush_rcsum.

Note: A valid IPv4 header has checksum 0, unlike IPv6. Thus,
the change is not needed in the sibling xfrm4_transport_finish
function.

Signed-off-by: Yossi Kuperman <yossiku@mellanox.com>
Signed-off-by: Ilan Tayari <ilant@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Yossi Kuperman 2017-08-01 12:49:06 +03:00 committed by Steffen Klassert
parent e51a647270
commit e9cba69448
1 changed files with 3 additions and 1 deletions
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4
net/ipv6/xfrm6_input.c
View File

@ -34,6 +34,7 @@ EXPORT_SYMBOL(xfrm6_rcv_spi);
int xfrm6_transport_finish(struct sk_buff *skb, int async)
{
struct xfrm_offload *xo = xfrm_offload(skb);
int nhlen = skb->data - skb_network_header(skb);
skb_network_header(skb)[IP6CB(skb)->nhoff] =
XFRM_MODE_SKB_CB(skb)->protocol;
@ -43,8 +44,9 @@ int xfrm6_transport_finish(struct sk_buff *skb, int async)
return 1;
#endif
__skb_push(skb, skb->data - skb_network_header(skb));
__skb_push(skb, nhlen);
ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
skb_postpush_rcsum(skb, skb_network_header(skb), nhlen);
if (xo && (xo->flags & XFRM_GRO)) {
skb_mac_header_rebuild(skb);