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xfrm: Clear RX SKB secpath xfrm_offload

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If an incoming packet undergoes XFRM crypto-offload, its secpath is
filled with xfrm_offload struct denoting offload information.

If the SKB is then forwarded to a device which supports crypto-
offload, the stack wrongfully attempts to offload it (even though
the output SA may not exist on the device) due to the leftover
secpath xo.

Clear the ingress xo by zeroizing secpath->olen just before
delivering the decapsulated packet to the network stack.

Fixes: d77e38e612 ("xfrm: Add an IPsec hardware offloading API")
Signed-off-by: Ilan Tayari <ilant@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Ilan Tayari 2017-08-01 12:49:09 +03:00 committed by Steffen Klassert
parent ffdb5211da
commit 7e9e9202bc
1 changed files with 2 additions and 0 deletions
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2
net/xfrm/xfrm_input.c
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@ -424,6 +424,7 @@ resume:
nf_reset(skb);
if (decaps) {
skb->sp->olen = 0;
skb_dst_drop(skb);
gro_cells_receive(&gro_cells, skb);
return 0;
@ -434,6 +435,7 @@ resume:
err = x->inner_mode->afinfo->transport_finish(skb, xfrm_gro || async);
if (xfrm_gro) {
skb->sp->olen = 0;
skb_dst_drop(skb);
gro_cells_receive(&gro_cells, skb);
return err;