164 lines
3.5 KiB
C
164 lines
3.5 KiB
C
/*
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* xfrm6_input.c: based on net/ipv4/xfrm4_input.c
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*
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* Authors:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* YOSHIFUJI Hideaki @USAGI
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* IPv6 support
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)
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{
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struct ipv6hdr *outer_iph = skb->nh.ipv6h;
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struct ipv6hdr *inner_iph = skb->h.ipv6h;
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if (INET_ECN_is_ce(ipv6_get_dsfield(outer_iph)))
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IP6_ECN_set_ce(inner_iph);
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}
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int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi)
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{
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int err;
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u32 seq;
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struct xfrm_state *xfrm_vec[XFRM_MAX_DEPTH];
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struct xfrm_state *x;
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int xfrm_nr = 0;
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int decaps = 0;
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int nexthdr;
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unsigned int nhoff;
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nhoff = IP6CB(skb)->nhoff;
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nexthdr = skb->nh.raw[nhoff];
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seq = 0;
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if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
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goto drop;
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do {
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struct ipv6hdr *iph = skb->nh.ipv6h;
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if (xfrm_nr == XFRM_MAX_DEPTH)
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goto drop;
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x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, nexthdr, AF_INET6);
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if (x == NULL)
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goto drop;
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spin_lock(&x->lock);
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if (unlikely(x->km.state != XFRM_STATE_VALID))
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goto drop_unlock;
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if (x->props.replay_window && xfrm_replay_check(x, seq))
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goto drop_unlock;
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if (xfrm_state_check_expire(x))
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goto drop_unlock;
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nexthdr = x->type->input(x, skb);
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if (nexthdr <= 0)
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goto drop_unlock;
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skb->nh.raw[nhoff] = nexthdr;
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if (x->props.replay_window)
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xfrm_replay_advance(x, seq);
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x->curlft.bytes += skb->len;
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x->curlft.packets++;
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spin_unlock(&x->lock);
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xfrm_vec[xfrm_nr++] = x;
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if (x->props.mode) { /* XXX */
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if (nexthdr != IPPROTO_IPV6)
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goto drop;
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if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
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goto drop;
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if (skb_cloned(skb) &&
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pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
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goto drop;
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if (x->props.flags & XFRM_STATE_DECAP_DSCP)
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ipv6_copy_dscp(skb->nh.ipv6h, skb->h.ipv6h);
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if (!(x->props.flags & XFRM_STATE_NOECN))
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ipip6_ecn_decapsulate(skb);
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skb->mac.raw = memmove(skb->data - skb->mac_len,
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skb->mac.raw, skb->mac_len);
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skb->nh.raw = skb->data;
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decaps = 1;
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break;
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}
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if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) < 0)
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goto drop;
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} while (!err);
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/* Allocate new secpath or COW existing one. */
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if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
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struct sec_path *sp;
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sp = secpath_dup(skb->sp);
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if (!sp)
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goto drop;
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if (skb->sp)
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secpath_put(skb->sp);
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skb->sp = sp;
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}
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if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
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goto drop;
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memcpy(skb->sp->xvec + skb->sp->len, xfrm_vec,
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xfrm_nr * sizeof(xfrm_vec[0]));
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skb->sp->len += xfrm_nr;
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skb->ip_summed = CHECKSUM_NONE;
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nf_reset(skb);
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if (decaps) {
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if (!(skb->dev->flags&IFF_LOOPBACK)) {
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dst_release(skb->dst);
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skb->dst = NULL;
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}
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netif_rx(skb);
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return -1;
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} else {
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#ifdef CONFIG_NETFILTER
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skb->nh.ipv6h->payload_len = htons(skb->len);
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__skb_push(skb, skb->data - skb->nh.raw);
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NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
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ip6_rcv_finish);
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return -1;
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#else
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return 1;
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#endif
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}
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drop_unlock:
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spin_unlock(&x->lock);
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xfrm_state_put(x);
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drop:
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while (--xfrm_nr >= 0)
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xfrm_state_put(xfrm_vec[xfrm_nr]);
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kfree_skb(skb);
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return -1;
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}
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EXPORT_SYMBOL(xfrm6_rcv_spi);
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int xfrm6_rcv(struct sk_buff **pskb)
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{
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return xfrm6_rcv_spi(*pskb, 0);
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}
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