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409 lines
9.4 KiB
409 lines
9.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* IPV6 GSO/GRO offload support |
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* Linux INET implementation |
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* |
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* Copyright (C) 2016 secunet Security Networks AG |
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* Author: Steffen Klassert <[email protected]> |
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* |
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* ESP GRO support |
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*/ |
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#include <linux/skbuff.h> |
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#include <linux/init.h> |
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#include <net/protocol.h> |
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#include <crypto/aead.h> |
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#include <crypto/authenc.h> |
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#include <linux/err.h> |
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#include <linux/module.h> |
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#include <net/ip.h> |
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#include <net/xfrm.h> |
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#include <net/esp.h> |
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#include <linux/scatterlist.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <net/ip6_route.h> |
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#include <net/ipv6.h> |
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#include <linux/icmpv6.h> |
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static __u16 esp6_nexthdr_esp_offset(struct ipv6hdr *ipv6_hdr, int nhlen) |
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{ |
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int off = sizeof(struct ipv6hdr); |
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struct ipv6_opt_hdr *exthdr; |
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if (likely(ipv6_hdr->nexthdr == NEXTHDR_ESP)) |
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return offsetof(struct ipv6hdr, nexthdr); |
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while (off < nhlen) { |
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exthdr = (void *)ipv6_hdr + off; |
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if (exthdr->nexthdr == NEXTHDR_ESP) |
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return off; |
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off += ipv6_optlen(exthdr); |
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} |
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return 0; |
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} |
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static struct sk_buff *esp6_gro_receive(struct list_head *head, |
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struct sk_buff *skb) |
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{ |
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int offset = skb_gro_offset(skb); |
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struct xfrm_offload *xo; |
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struct xfrm_state *x; |
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__be32 seq; |
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__be32 spi; |
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int nhoff; |
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int err; |
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if (!pskb_pull(skb, offset)) |
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return NULL; |
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if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0) |
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goto out; |
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xo = xfrm_offload(skb); |
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if (!xo || !(xo->flags & CRYPTO_DONE)) { |
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struct sec_path *sp = secpath_set(skb); |
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if (!sp) |
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goto out; |
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if (sp->len == XFRM_MAX_DEPTH) |
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goto out_reset; |
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x = xfrm_state_lookup(dev_net(skb->dev), skb->mark, |
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(xfrm_address_t *)&ipv6_hdr(skb)->daddr, |
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spi, IPPROTO_ESP, AF_INET6); |
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if (!x) |
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goto out_reset; |
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skb->mark = xfrm_smark_get(skb->mark, x); |
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sp->xvec[sp->len++] = x; |
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sp->olen++; |
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xo = xfrm_offload(skb); |
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if (!xo) |
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goto out_reset; |
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} |
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xo->flags |= XFRM_GRO; |
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nhoff = esp6_nexthdr_esp_offset(ipv6_hdr(skb), offset); |
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if (!nhoff) |
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goto out; |
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IP6CB(skb)->nhoff = nhoff; |
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XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL; |
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XFRM_SPI_SKB_CB(skb)->family = AF_INET6; |
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XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); |
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XFRM_SPI_SKB_CB(skb)->seq = seq; |
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/* We don't need to handle errors from xfrm_input, it does all |
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* the error handling and frees the resources on error. */ |
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xfrm_input(skb, IPPROTO_ESP, spi, -2); |
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return ERR_PTR(-EINPROGRESS); |
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out_reset: |
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secpath_reset(skb); |
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out: |
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skb_push(skb, offset); |
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NAPI_GRO_CB(skb)->same_flow = 0; |
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NAPI_GRO_CB(skb)->flush = 1; |
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return NULL; |
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} |
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static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb) |
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{ |
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struct ip_esp_hdr *esph; |
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struct ipv6hdr *iph = ipv6_hdr(skb); |
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struct xfrm_offload *xo = xfrm_offload(skb); |
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u8 proto = iph->nexthdr; |
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skb_push(skb, -skb_network_offset(skb)); |
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if (x->outer_mode.encap == XFRM_MODE_TRANSPORT) { |
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__be16 frag; |
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ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto, &frag); |
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} |
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esph = ip_esp_hdr(skb); |
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*skb_mac_header(skb) = IPPROTO_ESP; |
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esph->spi = x->id.spi; |
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esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); |
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xo->proto = proto; |
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} |
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static struct sk_buff *xfrm6_tunnel_gso_segment(struct xfrm_state *x, |
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struct sk_buff *skb, |
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netdev_features_t features) |
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{ |
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__skb_push(skb, skb->mac_len); |
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return skb_mac_gso_segment(skb, features); |
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} |
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static struct sk_buff *xfrm6_transport_gso_segment(struct xfrm_state *x, |
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struct sk_buff *skb, |
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netdev_features_t features) |
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{ |
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const struct net_offload *ops; |
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struct sk_buff *segs = ERR_PTR(-EINVAL); |
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struct xfrm_offload *xo = xfrm_offload(skb); |
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skb->transport_header += x->props.header_len; |
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ops = rcu_dereference(inet6_offloads[xo->proto]); |
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if (likely(ops && ops->callbacks.gso_segment)) |
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segs = ops->callbacks.gso_segment(skb, features); |
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return segs; |
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} |
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static struct sk_buff *xfrm6_beet_gso_segment(struct xfrm_state *x, |
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struct sk_buff *skb, |
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netdev_features_t features) |
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{ |
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struct xfrm_offload *xo = xfrm_offload(skb); |
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struct sk_buff *segs = ERR_PTR(-EINVAL); |
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const struct net_offload *ops; |
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u8 proto = xo->proto; |
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skb->transport_header += x->props.header_len; |
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if (x->sel.family != AF_INET6) { |
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skb->transport_header -= |
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(sizeof(struct ipv6hdr) - sizeof(struct iphdr)); |
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if (proto == IPPROTO_BEETPH) { |
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struct ip_beet_phdr *ph = |
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(struct ip_beet_phdr *)skb->data; |
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skb->transport_header += ph->hdrlen * 8; |
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proto = ph->nexthdr; |
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} else { |
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skb->transport_header -= IPV4_BEET_PHMAXLEN; |
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} |
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if (proto == IPPROTO_TCP) |
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skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6; |
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} else { |
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__be16 frag; |
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skb->transport_header += |
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ipv6_skip_exthdr(skb, 0, &proto, &frag); |
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} |
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__skb_pull(skb, skb_transport_offset(skb)); |
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ops = rcu_dereference(inet6_offloads[proto]); |
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if (likely(ops && ops->callbacks.gso_segment)) |
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segs = ops->callbacks.gso_segment(skb, features); |
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return segs; |
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} |
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static struct sk_buff *xfrm6_outer_mode_gso_segment(struct xfrm_state *x, |
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struct sk_buff *skb, |
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netdev_features_t features) |
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{ |
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switch (x->outer_mode.encap) { |
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case XFRM_MODE_TUNNEL: |
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return xfrm6_tunnel_gso_segment(x, skb, features); |
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case XFRM_MODE_TRANSPORT: |
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return xfrm6_transport_gso_segment(x, skb, features); |
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case XFRM_MODE_BEET: |
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return xfrm6_beet_gso_segment(x, skb, features); |
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} |
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return ERR_PTR(-EOPNOTSUPP); |
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} |
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static struct sk_buff *esp6_gso_segment(struct sk_buff *skb, |
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netdev_features_t features) |
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{ |
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struct xfrm_state *x; |
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struct ip_esp_hdr *esph; |
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struct crypto_aead *aead; |
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netdev_features_t esp_features = features; |
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struct xfrm_offload *xo = xfrm_offload(skb); |
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struct sec_path *sp; |
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if (!xo) |
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return ERR_PTR(-EINVAL); |
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if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP)) |
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return ERR_PTR(-EINVAL); |
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sp = skb_sec_path(skb); |
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x = sp->xvec[sp->len - 1]; |
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aead = x->data; |
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esph = ip_esp_hdr(skb); |
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if (esph->spi != x->id.spi) |
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return ERR_PTR(-EINVAL); |
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if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) |
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return ERR_PTR(-EINVAL); |
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__skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)); |
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skb->encap_hdr_csum = 1; |
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if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) |
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esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK | |
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NETIF_F_SCTP_CRC); |
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else if (!(features & NETIF_F_HW_ESP_TX_CSUM)) |
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esp_features = features & ~(NETIF_F_CSUM_MASK | |
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NETIF_F_SCTP_CRC); |
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xo->flags |= XFRM_GSO_SEGMENT; |
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return xfrm6_outer_mode_gso_segment(x, skb, esp_features); |
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} |
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static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb) |
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{ |
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struct crypto_aead *aead = x->data; |
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struct xfrm_offload *xo = xfrm_offload(skb); |
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if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead))) |
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return -EINVAL; |
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if (!(xo->flags & CRYPTO_DONE)) |
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skb->ip_summed = CHECKSUM_NONE; |
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return esp6_input_done2(skb, 0); |
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} |
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static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features) |
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{ |
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int len; |
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int err; |
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int alen; |
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int blksize; |
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struct xfrm_offload *xo; |
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struct crypto_aead *aead; |
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struct esp_info esp; |
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bool hw_offload = true; |
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__u32 seq; |
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esp.inplace = true; |
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xo = xfrm_offload(skb); |
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if (!xo) |
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return -EINVAL; |
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if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) { |
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xo->flags |= CRYPTO_FALLBACK; |
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hw_offload = false; |
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} |
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esp.proto = xo->proto; |
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/* skb is pure payload to encrypt */ |
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aead = x->data; |
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alen = crypto_aead_authsize(aead); |
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esp.tfclen = 0; |
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/* XXX: Add support for tfc padding here. */ |
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blksize = ALIGN(crypto_aead_blocksize(aead), 4); |
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esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); |
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esp.plen = esp.clen - skb->len - esp.tfclen; |
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esp.tailen = esp.tfclen + esp.plen + alen; |
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if (!hw_offload || (hw_offload && !skb_is_gso(skb))) { |
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esp.nfrags = esp6_output_head(x, skb, &esp); |
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if (esp.nfrags < 0) |
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return esp.nfrags; |
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} |
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seq = xo->seq.low; |
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esp.esph = ip_esp_hdr(skb); |
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esp.esph->spi = x->id.spi; |
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skb_push(skb, -skb_network_offset(skb)); |
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if (xo->flags & XFRM_GSO_SEGMENT) { |
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esp.esph->seq_no = htonl(seq); |
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if (!skb_is_gso(skb)) |
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xo->seq.low++; |
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else |
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xo->seq.low += skb_shinfo(skb)->gso_segs; |
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} |
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esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32)); |
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len = skb->len - sizeof(struct ipv6hdr); |
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if (len > IPV6_MAXPLEN) |
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len = 0; |
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ipv6_hdr(skb)->payload_len = htons(len); |
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if (hw_offload) { |
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if (!skb_ext_add(skb, SKB_EXT_SEC_PATH)) |
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return -ENOMEM; |
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xo = xfrm_offload(skb); |
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if (!xo) |
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return -EINVAL; |
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xo->flags |= XFRM_XMIT; |
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return 0; |
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} |
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err = esp6_output_tail(x, skb, &esp); |
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if (err) |
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return err; |
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secpath_reset(skb); |
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return 0; |
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} |
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static const struct net_offload esp6_offload = { |
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.callbacks = { |
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.gro_receive = esp6_gro_receive, |
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.gso_segment = esp6_gso_segment, |
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}, |
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}; |
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static const struct xfrm_type_offload esp6_type_offload = { |
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.description = "ESP6 OFFLOAD", |
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.owner = THIS_MODULE, |
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.proto = IPPROTO_ESP, |
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.input_tail = esp6_input_tail, |
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.xmit = esp6_xmit, |
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.encap = esp6_gso_encap, |
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}; |
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static int __init esp6_offload_init(void) |
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{ |
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if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) { |
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pr_info("%s: can't add xfrm type offload\n", __func__); |
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return -EAGAIN; |
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} |
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return inet6_add_offload(&esp6_offload, IPPROTO_ESP); |
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} |
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static void __exit esp6_offload_exit(void) |
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{ |
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xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6); |
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inet6_del_offload(&esp6_offload, IPPROTO_ESP); |
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} |
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module_init(esp6_offload_init); |
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module_exit(esp6_offload_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Steffen Klassert <[email protected]>"); |
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MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET6, XFRM_PROTO_ESP); |
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MODULE_DESCRIPTION("IPV6 GSO/GRO offload support");
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