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 xfrm_state *x = NULL;
62 int wildcard = 0;
63 xfrm_address_t *xany;
64 int nh = 0;
65 int i = 0;
66
67 /* Allocate new secpath or COW existing one. */
68 if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
69 struct sec_path *sp;
70
71 sp = secpath_dup(skb->sp);
72 if (!sp) {
73 XFRM_INC_STATS(LINUX_MIB_XFRMINERROR);
74 goto drop;
75 }
76 if (skb->sp)
77 secpath_put(skb->sp);
78 skb->sp = sp;
79 }
80
81 if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
82 XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
83 goto drop;
84 }
85
86 xany = (xfrm_address_t *)&in6addr_any;
87
88 for (i = 0; i < 3; i++) {
89 xfrm_address_t *dst, *src;
90 switch (i) {
91 case 0:
92 dst = daddr;
93 src = saddr;
94 break;
95 case 1:
96 /* lookup state with wild-card source address */
97 wildcard = 1;
98 dst = daddr;
99 src = xany;
100 break;
101 case 2:
102 default:
103 /* lookup state with wild-card addresses */
104 wildcard = 1; /* XXX */
105 dst = xany;
106 src = xany;
107 break;
108 }
109
110 x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
111 if (!x)
112 continue;
113
114 spin_lock(&x->lock);
115
116 if (wildcard) {
117 if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
118 spin_unlock(&x->lock);
119 xfrm_state_put(x);
120 x = NULL;
121 continue;
122 }
123 }
124
125 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
126 spin_unlock(&x->lock);
127 xfrm_state_put(x);
128 x = NULL;
129 continue;
130 }
131 if (xfrm_state_check_expire(x)) {
132 spin_unlock(&x->lock);
133 xfrm_state_put(x);
134 x = NULL;
135 continue;
136 }
137
138 spin_unlock(&x->lock);
139
140 nh = x->type->input(x, skb);
141 if (nh <= 0) {
142 xfrm_state_put(x);
143 x = NULL;
144 continue;
145 }
146
147 /* Found a state */
148 break;
149 }
150
151 if (!x) {
152 XFRM_INC_STATS(LINUX_MIB_XFRMINNOSTATES);
153 xfrm_audit_state_notfound_simple(skb, AF_INET6);
154 goto drop;
155 }
156
157 skb->sp->xvec[skb->sp->len++] = x;
158
159 spin_lock(&x->lock);
160
161 x->curlft.bytes += skb->len;
162 x->curlft.packets++;
163
164 spin_unlock(&x->lock);
165
166 return 1;
167
168 drop:
169 return -1;
170 }
171
172 EXPORT_SYMBOL(xfrm6_input_addr);
173
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