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esp4: 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 12:49:04 +03:00 committed by Steffen Klassert
parent cb5b136c00
commit ec9567a9e0
2 changed files with 14 additions and 4 deletions
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14
net/ipv4/esp4.c
View File

@ -510,7 +510,8 @@ int esp_input_done2(struct sk_buff *skb, int err)
int elen = skb->len - hlen;
int ihl;
u8 nexthdr[2];
int padlen;
int padlen, trimlen;
__wsum csumdiff;
if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
kfree(ESP_SKB_CB(skb)->tmp);
@ -568,8 +569,15 @@ int esp_input_done2(struct sk_buff *skb, int err)
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
pskb_trim(skb, skb->len - alen - padlen - 2);
__skb_pull(skb, hlen);
trimlen = alen + padlen + 2;
if (skb->ip_summed == CHECKSUM_COMPLETE) {
csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
skb->csum = csum_block_sub(skb->csum, csumdiff,
skb->len - trimlen);
}
pskb_trim(skb, skb->len - trimlen);
skb_pull_rcsum(skb, hlen);
if (x->props.mode == XFRM_MODE_TUNNEL)
skb_reset_transport_header(skb);
else

4
net/ipv4/esp4_offload.c
View File

@ -182,11 +182,13 @@ static struct sk_buff *esp4_gso_segment(struct sk_buff *skb,
static int esp_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 esp_input_done2(skb, 0);
}