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/module.h>
13 #include <linux/string.h>
14 #include <linux/netfilter.h>
15 #include <linux/netfilter_ipv6.h>
19 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
23 struct xfrm_state *xfrm_vec[XFRM_MAX_DEPTH];
29 nhoff = IP6CB(skb)->nhoff;
32 if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
36 struct ipv6hdr *iph = ipv6_hdr(skb);
38 if (xfrm_nr == XFRM_MAX_DEPTH)
41 x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi,
46 if (unlikely(x->km.state != XFRM_STATE_VALID))
49 if (x->props.replay_window && xfrm_replay_check(x, seq))
52 if (xfrm_state_check_expire(x))
55 nexthdr = x->type->input(x, skb);
59 skb_network_header(skb)[nhoff] = nexthdr;
61 if (x->props.replay_window)
62 xfrm_replay_advance(x, seq);
64 x->curlft.bytes += skb->len;
67 spin_unlock(&x->lock);
69 xfrm_vec[xfrm_nr++] = x;
71 if (x->mode->input(x, skb))
74 if (x->props.mode == XFRM_MODE_TUNNEL) { /* XXX */
79 if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) < 0)
83 /* Allocate new secpath or COW existing one. */
84 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
86 sp = secpath_dup(skb->sp);
94 if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
97 memcpy(skb->sp->xvec + skb->sp->len, xfrm_vec,
98 xfrm_nr * sizeof(xfrm_vec[0]));
99 skb->sp->len += xfrm_nr;
100 skb->ip_summed = CHECKSUM_NONE;
105 dst_release(skb->dst);
110 #ifdef CONFIG_NETFILTER
111 ipv6_hdr(skb)->payload_len = htons(skb->len);
112 __skb_push(skb, skb->data - skb_network_header(skb));
114 NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
123 spin_unlock(&x->lock);
126 while (--xfrm_nr >= 0)
127 xfrm_state_put(xfrm_vec[xfrm_nr]);
132 EXPORT_SYMBOL(xfrm6_rcv_spi);
134 int xfrm6_rcv(struct sk_buff *skb)
136 return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
140 EXPORT_SYMBOL(xfrm6_rcv);
142 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
143 xfrm_address_t *saddr, u8 proto)
145 struct xfrm_state *x = NULL;
147 xfrm_address_t *xany;
148 struct xfrm_state *xfrm_vec_one = NULL;
152 xany = (xfrm_address_t *)&in6addr_any;
154 for (i = 0; i < 3; i++) {
155 xfrm_address_t *dst, *src;
162 /* lookup state with wild-card source address */
169 /* lookup state with wild-card addresses */
170 wildcard = 1; /* XXX */
176 x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
183 if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
184 spin_unlock(&x->lock);
191 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
192 spin_unlock(&x->lock);
197 if (xfrm_state_check_expire(x)) {
198 spin_unlock(&x->lock);
204 nh = x->type->input(x, skb);
206 spin_unlock(&x->lock);
212 x->curlft.bytes += skb->len;
215 spin_unlock(&x->lock);
224 /* Allocate new secpath or COW existing one. */
225 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
227 sp = secpath_dup(skb->sp);
231 secpath_put(skb->sp);
235 if (1 + skb->sp->len > XFRM_MAX_DEPTH)
238 skb->sp->xvec[skb->sp->len] = xfrm_vec_one;
244 xfrm_state_put(xfrm_vec_one);
248 EXPORT_SYMBOL(xfrm6_input_addr);