2 * xfrm6_input.c: based on net/ipv4/xfrm4_input.c
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * YOSHIFUJI Hideaki @USAGI
12 #include <linux/string.h>
13 #include <net/inet_ecn.h>
18 static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)
20 struct ipv6hdr *outer_iph = skb->nh.ipv6h;
21 struct ipv6hdr *inner_iph = skb->h.ipv6h;
23 if (INET_ECN_is_ce(ip6_get_dsfield(outer_iph)) &&
24 INET_ECN_is_not_ce(ip6_get_dsfield(inner_iph)))
25 IP6_ECN_set_ce(inner_iph);
28 int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
30 struct sk_buff *skb = *pskb;
33 struct sec_decap_state xfrm_vec[XFRM_MAX_DEPTH];
40 ip6_find_1stfragopt(skb, &prevhdr);
42 *nhoffp = prevhdr - skb->nh.raw;
44 if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
48 struct ipv6hdr *iph = skb->nh.ipv6h;
50 if (xfrm_nr == XFRM_MAX_DEPTH)
53 x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, nexthdr, AF_INET6);
57 if (unlikely(x->km.state != XFRM_STATE_VALID))
60 if (x->props.replay_window && xfrm_replay_check(x, seq))
63 if (xfrm_state_check_expire(x))
66 nexthdr = x->type->input(x, &(xfrm_vec[xfrm_nr].decap), skb);
70 if (x->props.replay_window)
71 xfrm_replay_advance(x, seq);
73 x->curlft.bytes += skb->len;
76 spin_unlock(&x->lock);
78 xfrm_vec[xfrm_nr++].xvec = x;
80 if (x->props.mode) { /* XXX */
81 if (nexthdr != IPPROTO_IPV6)
83 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
85 if (skb_cloned(skb) &&
86 pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
88 if (!(x->props.flags & XFRM_STATE_NOECN))
89 ipip6_ecn_decapsulate(skb);
90 skb->mac.raw = memmove(skb->data - skb->mac_len,
91 skb->mac.raw, skb->mac_len);
92 skb->nh.raw = skb->data;
97 if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) < 0)
101 /* Allocate new secpath or COW existing one. */
102 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
104 sp = secpath_dup(skb->sp);
108 secpath_put(skb->sp);
112 if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
115 memcpy(skb->sp->x+skb->sp->len, xfrm_vec, xfrm_nr*sizeof(struct sec_decap_state));
116 skb->sp->len += xfrm_nr;
117 skb->ip_summed = CHECKSUM_NONE;
120 if (!(skb->dev->flags&IFF_LOOPBACK)) {
121 dst_release(skb->dst);
131 spin_unlock(&x->lock);
134 while (--xfrm_nr >= 0)
135 xfrm_state_put(xfrm_vec[xfrm_nr].xvec);