diff options
Diffstat (limited to 'net/ipv6/esp6.c')
-rw-r--r-- | net/ipv6/esp6.c | 61 |
1 files changed, 46 insertions, 15 deletions
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c index ab64f367d11c..89910e2c10f4 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -463,28 +463,30 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) return esp6_output_tail(x, skb, &esp); } -int esp6_input_done2(struct sk_buff *skb, int err) +static inline int esp_remove_trailer(struct sk_buff *skb) { struct xfrm_state *x = xfrm_input_state(skb); struct xfrm_offload *xo = xfrm_offload(skb); struct crypto_aead *aead = x->data; - int alen = crypto_aead_authsize(aead); - 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 alen, hlen, elen; + int padlen, trimlen; + __wsum csumdiff; u8 nexthdr[2]; + int ret; - if (!xo || (xo && !(xo->flags & CRYPTO_DONE))) - kfree(ESP_SKB_CB(skb)->tmp); + alen = crypto_aead_authsize(aead); + hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); + elen = skb->len - hlen; - if (unlikely(err)) + if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) { + ret = xo->proto; goto out; + } if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) BUG(); - err = -EINVAL; + ret = -EINVAL; padlen = nexthdr[0]; if (padlen + 2 + alen >= elen) { net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n", @@ -492,17 +494,46 @@ int esp6_input_done2(struct sk_buff *skb, int err) goto out; } - /* ... check padding bits here. Silly. :-) */ + 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); + + ret = nexthdr[1]; + +out: + return ret; +} - pskb_trim(skb, skb->len - alen - padlen - 2); - __skb_pull(skb, hlen); +int esp6_input_done2(struct sk_buff *skb, int err) +{ + struct xfrm_state *x = xfrm_input_state(skb); + struct xfrm_offload *xo = xfrm_offload(skb); + struct crypto_aead *aead = x->data; + int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); + int hdr_len = skb_network_header_len(skb); + + if (!xo || (xo && !(xo->flags & CRYPTO_DONE))) + kfree(ESP_SKB_CB(skb)->tmp); + + if (unlikely(err)) + goto out; + + err = esp_remove_trailer(skb); + if (unlikely(err < 0)) + goto out; + + skb_postpull_rcsum(skb, skb_network_header(skb), + skb_network_header_len(skb)); + skb_pull_rcsum(skb, hlen); if (x->props.mode == XFRM_MODE_TUNNEL) skb_reset_transport_header(skb); else skb_set_transport_header(skb, -hdr_len); - err = nexthdr[1]; - /* RFC4303: Drop dummy packets without any error */ if (err == IPPROTO_NONE) err = -EINVAL; |