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esp6: Support RX checksum with crypto offload

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Keep the device's reported ip_summed indication in case crypto
was offloaded by the device. Subtract the csum values of the
stripped parts (esp header+iv, esp trailer+auth_data) to keep
value correct.

Note: CHECKSUM_COMPLETE should be indicated only if skb->csum
has the post-decryption offload csum value.

Signed-off-by: Ariel Levkovich <lariel@mellanox.com>
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 12:49:05 +03:00
committed by Steffen Klassert
parent ec9567a9e0
commit e51a647270
2 changed files with 14 additions and 4 deletions
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4
net/ipv6/esp6_offload.c
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@@ -209,11 +209,13 @@ out:
static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb)
{
struct crypto_aead *aead = x->data;
struct xfrm_offload *xo = xfrm_offload(skb);
if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead)))
return -EINVAL;
skb->ip_summed = CHECKSUM_NONE;
if (!(xo->flags & CRYPTO_DONE))
skb->ip_summed = CHECKSUM_NONE;
return esp6_input_done2(skb, 0);
}