x86/PCI: remove redundant warnings
[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 #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(PF_INET6, 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
56 EXPORT_SYMBOL(xfrm6_rcv);
57
58 int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
59                      xfrm_address_t *saddr, u8 proto)
60 {
61         struct net *net = dev_net(skb->dev);
62         struct xfrm_state *x = NULL;
63         int i = 0;
64
65         /* Allocate new secpath or COW existing one. */
66         if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
67                 struct sec_path *sp;
68
69                 sp = secpath_dup(skb->sp);
70                 if (!sp) {
71                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
72                         goto drop;
73                 }
74                 if (skb->sp)
75                         secpath_put(skb->sp);
76                 skb->sp = sp;
77         }
78
79         if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
80                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
81                 goto drop;
82         }
83
84         for (i = 0; i < 3; i++) {
85                 xfrm_address_t *dst, *src;
86
87                 switch (i) {
88                 case 0:
89                         dst = daddr;
90                         src = saddr;
91                         break;
92                 case 1:
93                         /* lookup state with wild-card source address */
94                         dst = daddr;
95                         src = (xfrm_address_t *)&in6addr_any;
96                         break;
97                 default:
98                         /* lookup state with wild-card addresses */
99                         dst = (xfrm_address_t *)&in6addr_any;
100                         src = (xfrm_address_t *)&in6addr_any;
101                         break;
102                 }
103
104                 x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
105                 if (!x)
106                         continue;
107
108                 spin_lock(&x->lock);
109
110                 if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
111                     likely(x->km.state == XFRM_STATE_VALID) &&
112                     !xfrm_state_check_expire(x)) {
113                         spin_unlock(&x->lock);
114                         if (x->type->input(x, skb) > 0) {
115                                 /* found a valid state */
116                                 break;
117                         }
118                 } else
119                         spin_unlock(&x->lock);
120
121                 xfrm_state_put(x);
122                 x = NULL;
123         }
124
125         if (!x) {
126                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
127                 xfrm_audit_state_notfound_simple(skb, AF_INET6);
128                 goto drop;
129         }
130
131         skb->sp->xvec[skb->sp->len++] = x;
132
133         spin_lock(&x->lock);
134
135         x->curlft.bytes += skb->len;
136         x->curlft.packets++;
137
138         spin_unlock(&x->lock);
139
140         return 1;
141
142 drop:
143         return -1;
144 }
145
146 EXPORT_SYMBOL(xfrm6_input_addr);