421 lines
9.6 KiB
C
421 lines
9.6 KiB
C
// 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 <steffen.klassert@secunet.com>
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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/gro.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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__be16 type = x->inner_mode.family == AF_INET ? htons(ETH_P_IP)
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: htons(ETH_P_IPV6);
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return skb_eth_gso_segment(skb, features, type);
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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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if (proto == IPPROTO_IPIP)
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skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6;
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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 || !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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if (xo->seq.low < seq)
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xo->seq.hi++;
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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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if (skb_needs_linearize(skb, skb->dev->features) &&
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__skb_linearize(skb))
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return -ENOMEM;
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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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.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 <steffen.klassert@secunet.com>");
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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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