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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * xfrm6_input.c: based on net/ipv4/xfrm4_input.c | |
3 | * | |
4 | * Authors: | |
5 | * Mitsuru KANDA @USAGI | |
67ba4152 IM |
6 | * Kazunori MIYAZAWA @USAGI |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
1da177e4 LT |
8 | * YOSHIFUJI Hideaki @USAGI |
9 | * IPv6 support | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/string.h> | |
b05e1066 PM |
14 | #include <linux/netfilter.h> |
15 | #include <linux/netfilter_ipv6.h> | |
1da177e4 LT |
16 | #include <net/ipv6.h> |
17 | #include <net/xfrm.h> | |
18 | ||
227620e2 HX |
19 | int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb) |
20 | { | |
21 | return xfrm6_extract_header(skb); | |
22 | } | |
23 | ||
63c43787 ND |
24 | int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, |
25 | struct ip6_tnl *t) | |
1da177e4 | 26 | { |
63c43787 | 27 | XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t; |
2fcb45b6 | 28 | XFRM_SPI_SKB_CB(skb)->family = AF_INET6; |
716062fd HX |
29 | XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); |
30 | return xfrm_input(skb, nexthdr, spi, 0); | |
31 | } | |
32 | EXPORT_SYMBOL(xfrm6_rcv_spi); | |
b05e1066 | 33 | |
716062fd HX |
34 | int xfrm6_transport_finish(struct sk_buff *skb, int async) |
35 | { | |
60d5fcfb HX |
36 | skb_network_header(skb)[IP6CB(skb)->nhoff] = |
37 | XFRM_MODE_SKB_CB(skb)->protocol; | |
38 | ||
0883ae0e HX |
39 | #ifndef CONFIG_NETFILTER |
40 | if (!async) | |
41 | return 1; | |
42 | #endif | |
43 | ||
716062fd HX |
44 | ipv6_hdr(skb)->payload_len = htons(skb->len); |
45 | __skb_push(skb, skb->data - skb_network_header(skb)); | |
b05e1066 | 46 | |
29a26a56 EB |
47 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, |
48 | dev_net(skb->dev), NULL, skb, skb->dev, NULL, | |
716062fd HX |
49 | ip6_rcv_finish); |
50 | return -1; | |
1da177e4 LT |
51 | } |
52 | ||
63c43787 | 53 | int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t) |
1da177e4 | 54 | { |
33b5ecb8 | 55 | return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff], |
63c43787 | 56 | 0, t); |
1da177e4 | 57 | } |
63c43787 | 58 | EXPORT_SYMBOL(xfrm6_rcv_tnl); |
7159039a | 59 | |
63c43787 ND |
60 | int xfrm6_rcv(struct sk_buff *skb) |
61 | { | |
62 | return xfrm6_rcv_tnl(skb, NULL); | |
63 | } | |
64 | EXPORT_SYMBOL(xfrm6_rcv); | |
fbd9a5b4 MN |
65 | int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
66 | xfrm_address_t *saddr, u8 proto) | |
67 | { | |
59c9940e | 68 | struct net *net = dev_net(skb->dev); |
1ab1457c | 69 | struct xfrm_state *x = NULL; |
fbd9a5b4 MN |
70 | int i = 0; |
71 | ||
9473e1f6 MN |
72 | /* Allocate new secpath or COW existing one. */ |
73 | if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { | |
74 | struct sec_path *sp; | |
75 | ||
76 | sp = secpath_dup(skb->sp); | |
77 | if (!sp) { | |
59c9940e | 78 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); |
9473e1f6 MN |
79 | goto drop; |
80 | } | |
81 | if (skb->sp) | |
82 | secpath_put(skb->sp); | |
83 | skb->sp = sp; | |
84 | } | |
85 | ||
86 | if (1 + skb->sp->len == XFRM_MAX_DEPTH) { | |
59c9940e | 87 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
9473e1f6 MN |
88 | goto drop; |
89 | } | |
90 | ||
fbd9a5b4 MN |
91 | for (i = 0; i < 3; i++) { |
92 | xfrm_address_t *dst, *src; | |
a002c6fd | 93 | |
fbd9a5b4 MN |
94 | switch (i) { |
95 | case 0: | |
96 | dst = daddr; | |
97 | src = saddr; | |
98 | break; | |
99 | case 1: | |
100 | /* lookup state with wild-card source address */ | |
fbd9a5b4 | 101 | dst = daddr; |
a002c6fd | 102 | src = (xfrm_address_t *)&in6addr_any; |
fbd9a5b4 | 103 | break; |
fbd9a5b4 | 104 | default: |
1ab1457c | 105 | /* lookup state with wild-card addresses */ |
a002c6fd YH |
106 | dst = (xfrm_address_t *)&in6addr_any; |
107 | src = (xfrm_address_t *)&in6addr_any; | |
fbd9a5b4 | 108 | break; |
1ab1457c | 109 | } |
fbd9a5b4 | 110 | |
bd55775c | 111 | x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6); |
fbd9a5b4 MN |
112 | if (!x) |
113 | continue; | |
114 | ||
115 | spin_lock(&x->lock); | |
116 | ||
a002c6fd YH |
117 | if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) && |
118 | likely(x->km.state == XFRM_STATE_VALID) && | |
119 | !xfrm_state_check_expire(x)) { | |
fbd9a5b4 | 120 | spin_unlock(&x->lock); |
a002c6fd YH |
121 | if (x->type->input(x, skb) > 0) { |
122 | /* found a valid state */ | |
123 | break; | |
124 | } | |
125 | } else | |
fbd9a5b4 | 126 | spin_unlock(&x->lock); |
fbd9a5b4 | 127 | |
a002c6fd YH |
128 | xfrm_state_put(x); |
129 | x = NULL; | |
fbd9a5b4 MN |
130 | } |
131 | ||
9473e1f6 | 132 | if (!x) { |
59c9940e | 133 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
afeb14b4 | 134 | xfrm_audit_state_notfound_simple(skb, AF_INET6); |
fbd9a5b4 | 135 | goto drop; |
fbd9a5b4 MN |
136 | } |
137 | ||
9473e1f6 MN |
138 | skb->sp->xvec[skb->sp->len++] = x; |
139 | ||
140 | spin_lock(&x->lock); | |
fbd9a5b4 | 141 | |
9473e1f6 MN |
142 | x->curlft.bytes += skb->len; |
143 | x->curlft.packets++; | |
144 | ||
145 | spin_unlock(&x->lock); | |
fbd9a5b4 MN |
146 | |
147 | return 1; | |
9473e1f6 | 148 | |
fbd9a5b4 | 149 | drop: |
fbd9a5b4 MN |
150 | return -1; |
151 | } | |
7159039a | 152 | EXPORT_SYMBOL(xfrm6_input_addr); |