diff options
Diffstat (limited to 'net/ipv6/esp6_offload.c')
| -rw-r--r-- | net/ipv6/esp6_offload.c | 233 |
1 files changed, 217 insertions, 16 deletions
diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c index d914eb93204a..d950d43ba255 100644 --- a/net/ipv6/esp6_offload.c +++ b/net/ipv6/esp6_offload.c @@ -45,27 +45,31 @@ static struct sk_buff **esp6_gro_receive(struct sk_buff **head, if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0) goto out; - err = secpath_set(skb); - if (err) - goto out; + xo = xfrm_offload(skb); + if (!xo || !(xo->flags & CRYPTO_DONE)) { + err = secpath_set(skb); + if (err) + goto out; - if (skb->sp->len == XFRM_MAX_DEPTH) - goto out; + if (skb->sp->len == XFRM_MAX_DEPTH) + goto out; - x = xfrm_state_lookup(dev_net(skb->dev), skb->mark, - (xfrm_address_t *)&ipv6_hdr(skb)->daddr, - spi, IPPROTO_ESP, AF_INET6); - if (!x) - goto out; + x = xfrm_state_lookup(dev_net(skb->dev), skb->mark, + (xfrm_address_t *)&ipv6_hdr(skb)->daddr, + spi, IPPROTO_ESP, AF_INET6); + if (!x) + goto out; - skb->sp->xvec[skb->sp->len++] = x; - skb->sp->olen++; + skb->sp->xvec[skb->sp->len++] = x; + skb->sp->olen++; - xo = xfrm_offload(skb); - if (!xo) { - xfrm_state_put(x); - goto out; + xo = xfrm_offload(skb); + if (!xo) { + xfrm_state_put(x); + goto out; + } } + xo->flags |= XFRM_GRO; XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL; @@ -86,19 +90,216 @@ out: return NULL; } +static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb) +{ + struct ip_esp_hdr *esph; + struct ipv6hdr *iph = ipv6_hdr(skb); + struct xfrm_offload *xo = xfrm_offload(skb); + int proto = iph->nexthdr; + + skb_push(skb, -skb_network_offset(skb)); + esph = ip_esp_hdr(skb); + *skb_mac_header(skb) = IPPROTO_ESP; + + esph->spi = x->id.spi; + esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); + + xo->proto = proto; +} + +static struct sk_buff *esp6_gso_segment(struct sk_buff *skb, + netdev_features_t features) +{ + __u32 seq; + int err = 0; + struct sk_buff *skb2; + struct xfrm_state *x; + struct ip_esp_hdr *esph; + struct crypto_aead *aead; + struct sk_buff *segs = ERR_PTR(-EINVAL); + netdev_features_t esp_features = features; + struct xfrm_offload *xo = xfrm_offload(skb); + + if (!xo) + goto out; + + seq = xo->seq.low; + + x = skb->sp->xvec[skb->sp->len - 1]; + aead = x->data; + esph = ip_esp_hdr(skb); + + if (esph->spi != x->id.spi) + goto out; + + if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) + goto out; + + __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)); + + skb->encap_hdr_csum = 1; + + if (!(features & NETIF_F_HW_ESP)) + esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK); + + segs = x->outer_mode->gso_segment(x, skb, esp_features); + if (IS_ERR_OR_NULL(segs)) + goto out; + + __skb_pull(skb, skb->data - skb_mac_header(skb)); + + skb2 = segs; + do { + struct sk_buff *nskb = skb2->next; + + xo = xfrm_offload(skb2); + xo->flags |= XFRM_GSO_SEGMENT; + xo->seq.low = seq; + xo->seq.hi = xfrm_replay_seqhi(x, seq); + + if(!(features & NETIF_F_HW_ESP)) + xo->flags |= CRYPTO_FALLBACK; + + x->outer_mode->xmit(x, skb2); + + err = x->type_offload->xmit(x, skb2, esp_features); + if (err) { + kfree_skb_list(segs); + return ERR_PTR(err); + } + + if (!skb_is_gso(skb2)) + seq++; + else + seq += skb_shinfo(skb2)->gso_segs; + + skb_push(skb2, skb2->mac_len); + skb2 = nskb; + } while (skb2); + +out: + return segs; +} + +static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb) +{ + struct crypto_aead *aead = x->data; + + if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead))) + return -EINVAL; + + skb->ip_summed = CHECKSUM_NONE; + + return esp6_input_done2(skb, 0); +} + +static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features) +{ + int err; + int alen; + int blksize; + struct xfrm_offload *xo; + struct ip_esp_hdr *esph; + struct crypto_aead *aead; + struct esp_info esp; + bool hw_offload = true; + + esp.inplace = true; + + xo = xfrm_offload(skb); + + if (!xo) + return -EINVAL; + + if (!(features & NETIF_F_HW_ESP) || !x->xso.offload_handle || + (x->xso.dev != skb->dev)) { + xo->flags |= CRYPTO_FALLBACK; + hw_offload = false; + } + + esp.proto = xo->proto; + + /* skb is pure payload to encrypt */ + + aead = x->data; + alen = crypto_aead_authsize(aead); + + esp.tfclen = 0; + /* XXX: Add support for tfc padding here. */ + + blksize = ALIGN(crypto_aead_blocksize(aead), 4); + esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); + esp.plen = esp.clen - skb->len - esp.tfclen; + esp.tailen = esp.tfclen + esp.plen + alen; + + if (!hw_offload || (hw_offload && !skb_is_gso(skb))) { + esp.nfrags = esp6_output_head(x, skb, &esp); + if (esp.nfrags < 0) + return esp.nfrags; + } + + esph = ip_esp_hdr(skb); + esph->spi = x->id.spi; + + skb_push(skb, -skb_network_offset(skb)); + + if (xo->flags & XFRM_GSO_SEGMENT) { + esph->seq_no = htonl(xo->seq.low); + } else { + int len; + + len = skb->len - sizeof(struct ipv6hdr); + if (len > IPV6_MAXPLEN) + len = 0; + + ipv6_hdr(skb)->payload_len = htons(len); + } + + if (hw_offload) + return 0; + + esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32)); + + err = esp6_output_tail(x, skb, &esp); + if (err < 0) + return err; + + secpath_reset(skb); + + return 0; +} + static const struct net_offload esp6_offload = { .callbacks = { .gro_receive = esp6_gro_receive, + .gso_segment = esp6_gso_segment, }, }; +static const struct xfrm_type_offload esp6_type_offload = { + .description = "ESP6 OFFLOAD", + .owner = THIS_MODULE, + .proto = IPPROTO_ESP, + .input_tail = esp6_input_tail, + .xmit = esp6_xmit, + .encap = esp6_gso_encap, +}; + static int __init esp6_offload_init(void) { + if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) { + pr_info("%s: can't add xfrm type offload\n", __func__); + return -EAGAIN; + } + return inet6_add_offload(&esp6_offload, IPPROTO_ESP); } static void __exit esp6_offload_exit(void) { + if (xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6) < 0) + pr_info("%s: can't remove xfrm type offload\n", __func__); + inet6_del_offload(&esp6_offload, IPPROTO_ESP); } |