[PATCH net-next 2/4] esp6: Support RX checksum with crypto offload
flat view
STALE3407d
From: <hidden>
Date: 2017-06-22 12:32:23
Subsystem:
networking [general], networking [ipsec], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Steffen Klassert, Herbert Xu, Linus Torvalds
From: Ilan Tayari <redacted> 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 <redacted> Signed-off-by: Ilan Tayari <redacted> --- net/ipv6/esp6.c | 13 +++++++++++-- net/ipv6/esp6_offload.c | 4 +++- 2 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index d8b40ff4b2e6..f872bb16cc9d 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c@@ -475,7 +475,8 @@ int esp6_input_done2(struct sk_buff *skb, int err) int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); int elen = skb->len - hlen; int hdr_len = skb_network_header_len(skb); - int padlen; + int padlen, trimlen; + __wsum csumdiff; u8 nexthdr[2]; if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
@@ -497,7 +498,15 @@ int esp6_input_done2(struct sk_buff *skb, int err) /* ... check padding bits here. Silly. :-) */ - 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/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c
index f02f131f6435..eec3add177fe 100644
--- a/net/ipv6/esp6_offload.c
+++ b/net/ipv6/esp6_offload.c@@ -209,11 +209,13 @@ static struct sk_buff *esp6_gso_segment(struct sk_buff *skb, 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); }
--
2.11.0