Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
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 | |
6e23ae2a | 45 | NF_HOOK(PF_INET6, 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 | } |
fbd9a5b4 | 55 | |
7159039a YH |
56 | EXPORT_SYMBOL(xfrm6_rcv); |
57 | ||
fbd9a5b4 MN |
58 | int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, |
59 | xfrm_address_t *saddr, u8 proto) | |
60 | { | |
1ab1457c YH |
61 | struct xfrm_state *x = NULL; |
62 | int wildcard = 0; | |
fbd9a5b4 | 63 | xfrm_address_t *xany; |
1ab1457c | 64 | int nh = 0; |
fbd9a5b4 MN |
65 | int i = 0; |
66 | ||
9473e1f6 MN |
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) { | |
0aa64774 | 73 | XFRM_INC_STATS(LINUX_MIB_XFRMINERROR); |
9473e1f6 MN |
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) { | |
0aa64774 | 82 | XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR); |
9473e1f6 MN |
83 | goto drop; |
84 | } | |
85 | ||
c53b3590 | 86 | xany = (xfrm_address_t *)&in6addr_any; |
fbd9a5b4 MN |
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: | |
1ab1457c | 103 | /* lookup state with wild-card addresses */ |
fbd9a5b4 MN |
104 | wildcard = 1; /* XXX */ |
105 | dst = xany; | |
106 | src = xany; | |
107 | break; | |
1ab1457c | 108 | } |
fbd9a5b4 MN |
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); | |
1ab1457c YH |
128 | x = NULL; |
129 | continue; | |
fbd9a5b4 MN |
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 | ||
9473e1f6 MN |
138 | spin_unlock(&x->lock); |
139 | ||
fbd9a5b4 MN |
140 | nh = x->type->input(x, skb); |
141 | if (nh <= 0) { | |
fbd9a5b4 MN |
142 | xfrm_state_put(x); |
143 | x = NULL; | |
144 | continue; | |
145 | } | |
146 | ||
9473e1f6 | 147 | /* Found a state */ |
fbd9a5b4 MN |
148 | break; |
149 | } | |
150 | ||
9473e1f6 | 151 | if (!x) { |
0aa64774 | 152 | XFRM_INC_STATS(LINUX_MIB_XFRMINNOSTATES); |
afeb14b4 | 153 | xfrm_audit_state_notfound_simple(skb, AF_INET6); |
fbd9a5b4 | 154 | goto drop; |
fbd9a5b4 MN |
155 | } |
156 | ||
9473e1f6 MN |
157 | skb->sp->xvec[skb->sp->len++] = x; |
158 | ||
159 | spin_lock(&x->lock); | |
fbd9a5b4 | 160 | |
9473e1f6 MN |
161 | x->curlft.bytes += skb->len; |
162 | x->curlft.packets++; | |
163 | ||
164 | spin_unlock(&x->lock); | |
fbd9a5b4 MN |
165 | |
166 | return 1; | |
9473e1f6 | 167 | |
fbd9a5b4 | 168 | drop: |
fbd9a5b4 MN |
169 | return -1; |
170 | } | |
7159039a YH |
171 | |
172 | EXPORT_SYMBOL(xfrm6_input_addr); |