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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(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); |
147 |
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