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_extract_input(struct xfrm_state *x, struct sk_buff *skb)
21 return xfrm6_extract_header(skb);
24 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
26 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
27 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
28 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
29 return xfrm_input(skb, nexthdr, spi, 0);
31 EXPORT_SYMBOL(xfrm6_rcv_spi);
33 int xfrm6_transport_finish(struct sk_buff *skb, int async)
35 skb_network_header(skb)[IP6CB(skb)->nhoff] =
36 XFRM_MODE_SKB_CB(skb)->protocol;
38 #ifndef CONFIG_NETFILTER
43 ipv6_hdr(skb)->payload_len = htons(skb->len);
44 __skb_push(skb, skb->data - skb_network_header(skb));
46 NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
47 dev_net(skb->dev), NULL, skb, skb->dev, NULL,
52 int xfrm6_rcv(struct sk_buff *skb)
54 return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
57 EXPORT_SYMBOL(xfrm6_rcv);
59 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
60 xfrm_address_t *saddr, u8 proto)
62 struct net *net = dev_net(skb->dev);
63 struct xfrm_state *x = NULL;
66 /* Allocate new secpath or COW existing one. */
67 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
70 sp = secpath_dup(skb->sp);
72 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
80 if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
81 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
85 for (i = 0; i < 3; i++) {
86 xfrm_address_t *dst, *src;
94 /* lookup state with wild-card source address */
96 src = (xfrm_address_t *)&in6addr_any;
99 /* lookup state with wild-card addresses */
100 dst = (xfrm_address_t *)&in6addr_any;
101 src = (xfrm_address_t *)&in6addr_any;
105 x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
111 if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
112 likely(x->km.state == XFRM_STATE_VALID) &&
113 !xfrm_state_check_expire(x)) {
114 spin_unlock(&x->lock);
115 if (x->type->input(x, skb) > 0) {
116 /* found a valid state */
120 spin_unlock(&x->lock);
127 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
128 xfrm_audit_state_notfound_simple(skb, AF_INET6);
132 skb->sp->xvec[skb->sp->len++] = x;
136 x->curlft.bytes += skb->len;
139 spin_unlock(&x->lock);
146 EXPORT_SYMBOL(xfrm6_input_addr);