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1 /*
2 * xfrm6_input.c: based on net/ipv4/xfrm4_input.c
3 *
4 * Authors:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * YOSHIFUJI Hideaki @USAGI
9 * IPv6 support
10 */
11
12 #include <linux/module.h>
13 #include <linux/string.h>
14 #include <linux/netfilter.h>
15 #include <linux/netfilter_ipv6.h>
16 #include <net/ipv6.h>
17 #include <net/xfrm.h>
18
19 int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb)
20 {
21 return xfrm6_extract_header(skb);
22 }
23
24 int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
25 {
26 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
27 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
28 return xfrm_input(skb, nexthdr, spi, 0);
29 }
30 EXPORT_SYMBOL(xfrm6_rcv_spi);
31
32 int xfrm6_transport_finish(struct sk_buff *skb, int async)
33 {
34 skb_network_header(skb)[IP6CB(skb)->nhoff] =
35 XFRM_MODE_SKB_CB(skb)->protocol;
36
37 #ifndef CONFIG_NETFILTER
38 if (!async)
39 return 1;
40 #endif
41
42 ipv6_hdr(skb)->payload_len = htons(skb->len);
43 __skb_push(skb, skb->data - skb_network_header(skb));
44
45 NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
46 ip6_rcv_finish);
47 return -1;
48 }
49
50 int xfrm6_rcv(struct sk_buff *skb)
51 {
52 return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
53 0);
54 }
55 EXPORT_SYMBOL(xfrm6_rcv);
56
57 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
58 xfrm_address_t *saddr, u8 proto)
59 {
60 struct net *net = dev_net(skb->dev);
61 struct xfrm_state *x = NULL;
62 int i = 0;
63
64 /* Allocate new secpath or COW existing one. */
65 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
66 struct sec_path *sp;
67
68 sp = secpath_dup(skb->sp);
69 if (!sp) {
70 XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
71 goto drop;
72 }
73 if (skb->sp)
74 secpath_put(skb->sp);
75 skb->sp = sp;
76 }
77
78 if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
79 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
80 goto drop;
81 }
82
83 for (i = 0; i < 3; i++) {
84 xfrm_address_t *dst, *src;
85
86 switch (i) {
87 case 0:
88 dst = daddr;
89 src = saddr;
90 break;
91 case 1:
92 /* lookup state with wild-card source address */
93 dst = daddr;
94 src = (xfrm_address_t *)&in6addr_any;
95 break;
96 default:
97 /* lookup state with wild-card addresses */
98 dst = (xfrm_address_t *)&in6addr_any;
99 src = (xfrm_address_t *)&in6addr_any;
100 break;
101 }
102
103 x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
104 if (!x)
105 continue;
106
107 spin_lock(&x->lock);
108
109 if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
110 likely(x->km.state == XFRM_STATE_VALID) &&
111 !xfrm_state_check_expire(x)) {
112 spin_unlock(&x->lock);
113 if (x->type->input(x, skb) > 0) {
114 /* found a valid state */
115 break;
116 }
117 } else
118 spin_unlock(&x->lock);
119
120 xfrm_state_put(x);
121 x = NULL;
122 }
123
124 if (!x) {
125 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
126 xfrm_audit_state_notfound_simple(skb, AF_INET6);
127 goto drop;
128 }
129
130 skb->sp->xvec[skb->sp->len++] = x;
131
132 spin_lock(&x->lock);
133
134 x->curlft.bytes += skb->len;
135 x->curlft.packets++;
136
137 spin_unlock(&x->lock);
138
139 return 1;
140
141 drop:
142 return -1;
143 }
144 EXPORT_SYMBOL(xfrm6_input_addr);
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