Commit | Line | Data |
---|---|---|
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 | ||
33b5ecb8 | 24 | int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) |
1da177e4 | 25 | { |
2fcb45b6 | 26 | XFRM_SPI_SKB_CB(skb)->family = AF_INET6; |
716062fd HX |
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); | |
b05e1066 | 31 | |
716062fd HX |
32 | int xfrm6_transport_finish(struct sk_buff *skb, int async) |
33 | { | |
60d5fcfb HX |
34 | skb_network_header(skb)[IP6CB(skb)->nhoff] = |
35 | XFRM_MODE_SKB_CB(skb)->protocol; | |
36 | ||
0883ae0e HX |
37 | #ifndef CONFIG_NETFILTER |
38 | if (!async) | |
39 | return 1; | |
40 | #endif | |
41 | ||
716062fd HX |
42 | ipv6_hdr(skb)->payload_len = htons(skb->len); |
43 | __skb_push(skb, skb->data - skb_network_header(skb)); | |
b05e1066 | 44 | |
b2e0b385 | 45 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
716062fd HX |
46 | ip6_rcv_finish); |
47 | return -1; | |
1da177e4 LT |
48 | } |
49 | ||
e5bbef20 | 50 | int xfrm6_rcv(struct sk_buff *skb) |
1da177e4 | 51 | { |
33b5ecb8 HX |
52 | return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff], |
53 | 0); | |
1da177e4 | 54 | } |
7159039a YH |
55 | EXPORT_SYMBOL(xfrm6_rcv); |
56 | ||
fbd9a5b4 MN |
57 | int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
58 | xfrm_address_t *saddr, u8 proto) | |
59 | { | |
59c9940e | 60 | struct net *net = dev_net(skb->dev); |
1ab1457c | 61 | struct xfrm_state *x = NULL; |
fbd9a5b4 MN |
62 | int i = 0; |
63 | ||
9473e1f6 MN |
64 | /* Allocate new secpath or COW existing one. */ |
65 | if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { | |
66 | struct sec_path *sp; | |
67 | ||
68 | sp = secpath_dup(skb->sp); | |
69 | if (!sp) { | |
59c9940e | 70 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); |
9473e1f6 MN |
71 | goto drop; |
72 | } | |
73 | if (skb->sp) | |
74 | secpath_put(skb->sp); | |
75 | skb->sp = sp; | |
76 | } | |
77 | ||
78 | if (1 + skb->sp->len == XFRM_MAX_DEPTH) { | |
59c9940e | 79 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
9473e1f6 MN |
80 | goto drop; |
81 | } | |
82 | ||
fbd9a5b4 MN |
83 | for (i = 0; i < 3; i++) { |
84 | xfrm_address_t *dst, *src; | |
a002c6fd | 85 | |
fbd9a5b4 MN |
86 | switch (i) { |
87 | case 0: | |
88 | dst = daddr; | |
89 | src = saddr; | |
90 | break; | |
91 | case 1: | |
92 | /* lookup state with wild-card source address */ | |
fbd9a5b4 | 93 | dst = daddr; |
a002c6fd | 94 | src = (xfrm_address_t *)&in6addr_any; |
fbd9a5b4 | 95 | break; |
fbd9a5b4 | 96 | default: |
1ab1457c | 97 | /* lookup state with wild-card addresses */ |
a002c6fd YH |
98 | dst = (xfrm_address_t *)&in6addr_any; |
99 | src = (xfrm_address_t *)&in6addr_any; | |
fbd9a5b4 | 100 | break; |
1ab1457c | 101 | } |
fbd9a5b4 | 102 | |
bd55775c | 103 | x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6); |
fbd9a5b4 MN |
104 | if (!x) |
105 | continue; | |
106 | ||
107 | spin_lock(&x->lock); | |
108 | ||
a002c6fd YH |
109 | if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) && |
110 | likely(x->km.state == XFRM_STATE_VALID) && | |
111 | !xfrm_state_check_expire(x)) { | |
fbd9a5b4 | 112 | spin_unlock(&x->lock); |
a002c6fd YH |
113 | if (x->type->input(x, skb) > 0) { |
114 | /* found a valid state */ | |
115 | break; | |
116 | } | |
117 | } else | |
fbd9a5b4 | 118 | spin_unlock(&x->lock); |
fbd9a5b4 | 119 | |
a002c6fd YH |
120 | xfrm_state_put(x); |
121 | x = NULL; | |
fbd9a5b4 MN |
122 | } |
123 | ||
9473e1f6 | 124 | if (!x) { |
59c9940e | 125 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
afeb14b4 | 126 | xfrm_audit_state_notfound_simple(skb, AF_INET6); |
fbd9a5b4 | 127 | goto drop; |
fbd9a5b4 MN |
128 | } |
129 | ||
9473e1f6 MN |
130 | skb->sp->xvec[skb->sp->len++] = x; |
131 | ||
132 | spin_lock(&x->lock); | |
fbd9a5b4 | 133 | |
9473e1f6 MN |
134 | x->curlft.bytes += skb->len; |
135 | x->curlft.packets++; | |
136 | ||
137 | spin_unlock(&x->lock); | |
fbd9a5b4 MN |
138 | |
139 | return 1; | |
9473e1f6 | 140 | |
fbd9a5b4 | 141 | drop: |
fbd9a5b4 MN |
142 | return -1; |
143 | } | |
7159039a | 144 | EXPORT_SYMBOL(xfrm6_input_addr); |