[PATCH net-next 1/4] esp4: Support RX checksum with crypto offload

[ilant]

From: Ilan Tayari <il...@mellanox.com>

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 <lar...@mellanox.com>
Signed-off-by: Ilan Tayari <il...@mellanox.com>
---
 net/ipv4/esp4.c         | 13 +++++++++++--
 net/ipv4/esp4_offload.c |  4 +++-
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 1f18b4650253..2eab0992b127 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);
@@ -568,7 +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);
+       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);
+               skb_postpull_rcsum(skb, skb->data, hlen);
+       }
+
+       pskb_trim(skb, skb->len - trimlen);
        __skb_pull(skb, hlen);
        if (x->props.mode == XFRM_MODE_TUNNEL)
                skb_reset_transport_header(skb);
diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index e0666016a764..05831dea00f4 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -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);
 }
-- 
2.11.0