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authorIlan Tayari <ilant@mellanox.com>2017-08-01 12:49:04 +0300
committerSteffen Klassert <steffen.klassert@secunet.com>2017-08-02 12:00:15 +0300
commitec9567a9e008d1248e4d88f7ff1026ba68133621 (patch)
tree3eb8ee70dd6aca66d8570c9e4d11d31b489e425c /net/ipv4/esp4.c
parentcb5b136c0095d434cb63495da8efb6a3d663a38f (diff)
downloadlinux-ec9567a9e008d1248e4d88f7ff1026ba68133621.tar.xz
esp4: Support RX checksum with crypto offload
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>
Diffstat (limited to 'net/ipv4/esp4.c')
-rw-r--r--net/ipv4/esp4.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 0cbee0a666ff..741acd7b9646 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -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