[IPSEC]: Use the correct family for input state lookup
[linux-2.6.git] / net / ipv6 / xfrm6_input.c
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 #ifdef CONFIG_NETFILTER
38         ipv6_hdr(skb)->payload_len = htons(skb->len);
39         __skb_push(skb, skb->data - skb_network_header(skb));
40
41         NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
42                 ip6_rcv_finish);
43         return -1;
44 #else
45         if (async)
46                 return ip6_rcv_finish(skb);
47
48         return 1;
49 #endif
50 }
51
52 int xfrm6_rcv(struct sk_buff *skb)
53 {
54         return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
55                              0);
56 }
57
58 EXPORT_SYMBOL(xfrm6_rcv);
59
60 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
61                      xfrm_address_t *saddr, u8 proto)
62 {
63         struct xfrm_state *x = NULL;
64         int wildcard = 0;
65         xfrm_address_t *xany;
66         struct xfrm_state *xfrm_vec_one = NULL;
67         int nh = 0;
68         int i = 0;
69
70         xany = (xfrm_address_t *)&in6addr_any;
71
72         for (i = 0; i < 3; i++) {
73                 xfrm_address_t *dst, *src;
74                 switch (i) {
75                 case 0:
76                         dst = daddr;
77                         src = saddr;
78                         break;
79                 case 1:
80                         /* lookup state with wild-card source address */
81                         wildcard = 1;
82                         dst = daddr;
83                         src = xany;
84                         break;
85                 case 2:
86                 default:
87                         /* lookup state with wild-card addresses */
88                         wildcard = 1; /* XXX */
89                         dst = xany;
90                         src = xany;
91                         break;
92                 }
93
94                 x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
95                 if (!x)
96                         continue;
97
98                 spin_lock(&x->lock);
99
100                 if (wildcard) {
101                         if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
102                                 spin_unlock(&x->lock);
103                                 xfrm_state_put(x);
104                                 x = NULL;
105                                 continue;
106                         }
107                 }
108
109                 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
110                         spin_unlock(&x->lock);
111                         xfrm_state_put(x);
112                         x = NULL;
113                         continue;
114                 }
115                 if (xfrm_state_check_expire(x)) {
116                         spin_unlock(&x->lock);
117                         xfrm_state_put(x);
118                         x = NULL;
119                         continue;
120                 }
121
122                 nh = x->type->input(x, skb);
123                 if (nh <= 0) {
124                         spin_unlock(&x->lock);
125                         xfrm_state_put(x);
126                         x = NULL;
127                         continue;
128                 }
129
130                 x->curlft.bytes += skb->len;
131                 x->curlft.packets++;
132
133                 spin_unlock(&x->lock);
134
135                 xfrm_vec_one = x;
136                 break;
137         }
138
139         if (!xfrm_vec_one)
140                 goto drop;
141
142         /* Allocate new secpath or COW existing one. */
143         if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
144                 struct sec_path *sp;
145                 sp = secpath_dup(skb->sp);
146                 if (!sp)
147                         goto drop;
148                 if (skb->sp)
149                         secpath_put(skb->sp);
150                 skb->sp = sp;
151         }
152
153         if (1 + skb->sp->len > XFRM_MAX_DEPTH)
154                 goto drop;
155
156         skb->sp->xvec[skb->sp->len] = xfrm_vec_one;
157         skb->sp->len ++;
158
159         return 1;
160 drop:
161         if (xfrm_vec_one)
162                 xfrm_state_put(xfrm_vec_one);
163         return -1;
164 }
165
166 EXPORT_SYMBOL(xfrm6_input_addr);