Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173 | |
3 | * | |
4 | * Copyright (C)2003 USAGI/WIDE Project | |
5 | * | |
6 | * Author Mitsuru KANDA <mk@linux-ipv6.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
1ab1457c | 12 | * |
1da177e4 LT |
13 | * This program is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
1ab1457c | 17 | * |
1da177e4 LT |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
1ab1457c | 22 | /* |
1da177e4 LT |
23 | * [Memo] |
24 | * | |
25 | * Outbound: | |
1ab1457c YH |
26 | * The compression of IP datagram MUST be done before AH/ESP processing, |
27 | * fragmentation, and the addition of Hop-by-Hop/Routing header. | |
1da177e4 LT |
28 | * |
29 | * Inbound: | |
1ab1457c | 30 | * The decompression of IP datagram MUST be done after the reassembly, |
1da177e4 LT |
31 | * AH/ESP processing. |
32 | */ | |
f3213831 JP |
33 | |
34 | #define pr_fmt(fmt) "IPv6: " fmt | |
35 | ||
1da177e4 LT |
36 | #include <linux/module.h> |
37 | #include <net/ip.h> | |
38 | #include <net/xfrm.h> | |
39 | #include <net/ipcomp.h> | |
1da177e4 | 40 | #include <linux/crypto.h> |
4999f362 | 41 | #include <linux/err.h> |
1da177e4 LT |
42 | #include <linux/pfkeyv2.h> |
43 | #include <linux/random.h> | |
44 | #include <linux/percpu.h> | |
45 | #include <linux/smp.h> | |
46 | #include <linux/list.h> | |
47 | #include <linux/vmalloc.h> | |
48 | #include <linux/rtnetlink.h> | |
49 | #include <net/icmp.h> | |
50 | #include <net/ipv6.h> | |
14c85021 | 51 | #include <net/protocol.h> |
1da177e4 LT |
52 | #include <linux/ipv6.h> |
53 | #include <linux/icmpv6.h> | |
4a3e2f71 | 54 | #include <linux/mutex.h> |
1da177e4 | 55 | |
1da177e4 | 56 | static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 57 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 58 | { |
d74340d3 | 59 | struct net *net = dev_net(skb->dev); |
a94cfd19 | 60 | __be32 spi; |
b71d1d42 | 61 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
87bdc48d HX |
62 | struct ip_comp_hdr *ipcomph = |
63 | (struct ip_comp_hdr *)(skb->data + offset); | |
1da177e4 LT |
64 | struct xfrm_state *x; |
65 | ||
66 | if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG) | |
67 | return; | |
68 | ||
4195f814 | 69 | spi = htonl(ntohs(ipcomph->cpi)); |
b71d1d42 ED |
70 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
71 | spi, IPPROTO_COMP, AF_INET6); | |
1da177e4 LT |
72 | if (!x) |
73 | return; | |
74 | ||
5b095d98 | 75 | printk(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/%pI6\n", |
0c6ce78a | 76 | spi, &iph->daddr); |
1da177e4 LT |
77 | xfrm_state_put(x); |
78 | } | |
79 | ||
80 | static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x) | |
81 | { | |
d74340d3 | 82 | struct net *net = xs_net(x); |
1da177e4 LT |
83 | struct xfrm_state *t = NULL; |
84 | ||
d74340d3 | 85 | t = xfrm_state_alloc(net); |
1da177e4 LT |
86 | if (!t) |
87 | goto out; | |
88 | ||
89 | t->id.proto = IPPROTO_IPV6; | |
d74340d3 | 90 | t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr); |
6abaaaae HX |
91 | if (!t->id.spi) |
92 | goto error; | |
93 | ||
1da177e4 LT |
94 | memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr)); |
95 | memcpy(&t->sel, &x->sel, sizeof(t->sel)); | |
96 | t->props.family = AF_INET6; | |
e40b3286 | 97 | t->props.mode = x->props.mode; |
1da177e4 | 98 | memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); |
bd55775c | 99 | memcpy(&t->mark, &x->mark, sizeof(t->mark)); |
1da177e4 | 100 | |
72cb6962 | 101 | if (xfrm_init_state(t)) |
1da177e4 LT |
102 | goto error; |
103 | ||
1da177e4 LT |
104 | atomic_set(&t->tunnel_users, 1); |
105 | ||
106 | out: | |
107 | return t; | |
108 | ||
109 | error: | |
6abaaaae | 110 | t->km.state = XFRM_STATE_DEAD; |
1da177e4 | 111 | xfrm_state_put(t); |
6abaaaae | 112 | t = NULL; |
1da177e4 LT |
113 | goto out; |
114 | } | |
115 | ||
116 | static int ipcomp6_tunnel_attach(struct xfrm_state *x) | |
117 | { | |
d74340d3 | 118 | struct net *net = xs_net(x); |
1da177e4 LT |
119 | int err = 0; |
120 | struct xfrm_state *t = NULL; | |
a94cfd19 | 121 | __be32 spi; |
bd55775c | 122 | u32 mark = x->mark.m & x->mark.v; |
1da177e4 | 123 | |
d74340d3 | 124 | spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr); |
1da177e4 | 125 | if (spi) |
bd55775c | 126 | t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr, |
1da177e4 LT |
127 | spi, IPPROTO_IPV6, AF_INET6); |
128 | if (!t) { | |
129 | t = ipcomp6_tunnel_create(x); | |
130 | if (!t) { | |
131 | err = -EINVAL; | |
132 | goto out; | |
133 | } | |
134 | xfrm_state_insert(t); | |
135 | xfrm_state_hold(t); | |
136 | } | |
137 | x->tunnel = t; | |
138 | atomic_inc(&t->tunnel_users); | |
139 | ||
140 | out: | |
141 | return err; | |
142 | } | |
143 | ||
72cb6962 | 144 | static int ipcomp6_init_state(struct xfrm_state *x) |
1da177e4 | 145 | { |
2c3abab7 | 146 | int err = -EINVAL; |
1da177e4 | 147 | |
1da177e4 | 148 | x->props.header_len = 0; |
ca68145f | 149 | switch (x->props.mode) { |
ca68145f HX |
150 | case XFRM_MODE_TRANSPORT: |
151 | break; | |
152 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 153 | x->props.header_len += sizeof(struct ipv6hdr); |
e40b3286 | 154 | break; |
ca68145f | 155 | default: |
e40b3286 | 156 | goto out; |
ca68145f | 157 | } |
1ab1457c | 158 | |
6fccab67 HX |
159 | err = ipcomp_init_state(x); |
160 | if (err) | |
e40b3286 HX |
161 | goto out; |
162 | ||
7e49e6de | 163 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
164 | err = ipcomp6_tunnel_attach(x); |
165 | if (err) | |
10e7454e | 166 | goto out; |
1da177e4 LT |
167 | } |
168 | ||
1da177e4 LT |
169 | err = 0; |
170 | out: | |
171 | return err; | |
1da177e4 LT |
172 | } |
173 | ||
533cb5b0 | 174 | static const struct xfrm_type ipcomp6_type = |
1da177e4 LT |
175 | { |
176 | .description = "IPCOMP6", | |
177 | .owner = THIS_MODULE, | |
178 | .proto = IPPROTO_COMP, | |
179 | .init_state = ipcomp6_init_state, | |
6fccab67 HX |
180 | .destructor = ipcomp_destroy, |
181 | .input = ipcomp_input, | |
182 | .output = ipcomp_output, | |
aee5adb4 | 183 | .hdr_offset = xfrm6_find_1stfragopt, |
1da177e4 LT |
184 | }; |
185 | ||
41135cc8 | 186 | static const struct inet6_protocol ipcomp6_protocol = |
1da177e4 LT |
187 | { |
188 | .handler = xfrm6_rcv, | |
189 | .err_handler = ipcomp6_err, | |
190 | .flags = INET6_PROTO_NOPOLICY, | |
191 | }; | |
192 | ||
193 | static int __init ipcomp6_init(void) | |
194 | { | |
195 | if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) { | |
f3213831 | 196 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
197 | return -EAGAIN; |
198 | } | |
199 | if (inet6_add_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) { | |
f3213831 | 200 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
201 | xfrm_unregister_type(&ipcomp6_type, AF_INET6); |
202 | return -EAGAIN; | |
203 | } | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static void __exit ipcomp6_fini(void) | |
208 | { | |
1ab1457c | 209 | if (inet6_del_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) |
f3213831 | 210 | pr_info("%s: can't remove protocol\n", __func__); |
1da177e4 | 211 | if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0) |
f3213831 | 212 | pr_info("%s: can't remove xfrm type\n", __func__); |
1da177e4 LT |
213 | } |
214 | ||
215 | module_init(ipcomp6_init); | |
216 | module_exit(ipcomp6_fini); | |
217 | MODULE_LICENSE("GPL"); | |
218 | MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173"); | |
219 | MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>"); | |
220 | ||
d3d6dd3a | 221 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP); |