From ec9567a9e008d1248e4d88f7ff1026ba68133621 Mon Sep 17 00:00:00 2001 From: Ilan Tayari Date: Tue, 1 Aug 2017 12:49:04 +0300 Subject: 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 Signed-off-by: Ilan Tayari Signed-off-by: Steffen Klassert --- net/ipv4/esp4.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) (limited to 'net/ipv4/esp4.c') 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 -- cgit v1.2.3