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> | |
81aded24 | 49 | #include <net/ip6_route.h> |
1da177e4 LT |
50 | #include <net/icmp.h> |
51 | #include <net/ipv6.h> | |
14c85021 | 52 | #include <net/protocol.h> |
1da177e4 LT |
53 | #include <linux/ipv6.h> |
54 | #include <linux/icmpv6.h> | |
4a3e2f71 | 55 | #include <linux/mutex.h> |
1da177e4 | 56 | |
1da177e4 | 57 | static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 58 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 59 | { |
d74340d3 | 60 | struct net *net = dev_net(skb->dev); |
a94cfd19 | 61 | __be32 spi; |
b71d1d42 | 62 | const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
87bdc48d HX |
63 | struct ip_comp_hdr *ipcomph = |
64 | (struct ip_comp_hdr *)(skb->data + offset); | |
1da177e4 LT |
65 | struct xfrm_state *x; |
66 | ||
b3b2b9e1 | 67 | if (type != ICMPV6_PKT_TOOBIG && |
ec18d9a2 | 68 | type != NDISC_REDIRECT) |
1da177e4 LT |
69 | return; |
70 | ||
4195f814 | 71 | spi = htonl(ntohs(ipcomph->cpi)); |
b71d1d42 ED |
72 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
73 | spi, IPPROTO_COMP, AF_INET6); | |
1da177e4 LT |
74 | if (!x) |
75 | return; | |
76 | ||
ec18d9a2 | 77 | if (type == NDISC_REDIRECT) |
b55b76b2 | 78 | ip6_redirect(skb, net, skb->dev->ifindex, 0); |
ec18d9a2 DM |
79 | else |
80 | ip6_update_pmtu(skb, net, info, 0, 0); | |
1da177e4 LT |
81 | xfrm_state_put(x); |
82 | } | |
83 | ||
84 | static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x) | |
85 | { | |
d74340d3 | 86 | struct net *net = xs_net(x); |
1da177e4 LT |
87 | struct xfrm_state *t = NULL; |
88 | ||
d74340d3 | 89 | t = xfrm_state_alloc(net); |
1da177e4 LT |
90 | if (!t) |
91 | goto out; | |
92 | ||
93 | t->id.proto = IPPROTO_IPV6; | |
d74340d3 | 94 | t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr); |
6abaaaae HX |
95 | if (!t->id.spi) |
96 | goto error; | |
97 | ||
1da177e4 LT |
98 | memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr)); |
99 | memcpy(&t->sel, &x->sel, sizeof(t->sel)); | |
100 | t->props.family = AF_INET6; | |
e40b3286 | 101 | t->props.mode = x->props.mode; |
1da177e4 | 102 | memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); |
bd55775c | 103 | memcpy(&t->mark, &x->mark, sizeof(t->mark)); |
1da177e4 | 104 | |
72cb6962 | 105 | if (xfrm_init_state(t)) |
1da177e4 LT |
106 | goto error; |
107 | ||
1da177e4 LT |
108 | atomic_set(&t->tunnel_users, 1); |
109 | ||
110 | out: | |
111 | return t; | |
112 | ||
113 | error: | |
6abaaaae | 114 | t->km.state = XFRM_STATE_DEAD; |
1da177e4 | 115 | xfrm_state_put(t); |
6abaaaae | 116 | t = NULL; |
1da177e4 LT |
117 | goto out; |
118 | } | |
119 | ||
120 | static int ipcomp6_tunnel_attach(struct xfrm_state *x) | |
121 | { | |
d74340d3 | 122 | struct net *net = xs_net(x); |
1da177e4 LT |
123 | int err = 0; |
124 | struct xfrm_state *t = NULL; | |
a94cfd19 | 125 | __be32 spi; |
bd55775c | 126 | u32 mark = x->mark.m & x->mark.v; |
1da177e4 | 127 | |
d74340d3 | 128 | spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr); |
1da177e4 | 129 | if (spi) |
bd55775c | 130 | t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr, |
1da177e4 LT |
131 | spi, IPPROTO_IPV6, AF_INET6); |
132 | if (!t) { | |
133 | t = ipcomp6_tunnel_create(x); | |
134 | if (!t) { | |
135 | err = -EINVAL; | |
136 | goto out; | |
137 | } | |
138 | xfrm_state_insert(t); | |
139 | xfrm_state_hold(t); | |
140 | } | |
141 | x->tunnel = t; | |
142 | atomic_inc(&t->tunnel_users); | |
143 | ||
144 | out: | |
145 | return err; | |
146 | } | |
147 | ||
72cb6962 | 148 | static int ipcomp6_init_state(struct xfrm_state *x) |
1da177e4 | 149 | { |
2c3abab7 | 150 | int err = -EINVAL; |
1da177e4 | 151 | |
1da177e4 | 152 | x->props.header_len = 0; |
ca68145f | 153 | switch (x->props.mode) { |
ca68145f HX |
154 | case XFRM_MODE_TRANSPORT: |
155 | break; | |
156 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 157 | x->props.header_len += sizeof(struct ipv6hdr); |
e40b3286 | 158 | break; |
ca68145f | 159 | default: |
e40b3286 | 160 | goto out; |
ca68145f | 161 | } |
1ab1457c | 162 | |
6fccab67 HX |
163 | err = ipcomp_init_state(x); |
164 | if (err) | |
e40b3286 HX |
165 | goto out; |
166 | ||
7e49e6de | 167 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
168 | err = ipcomp6_tunnel_attach(x); |
169 | if (err) | |
10e7454e | 170 | goto out; |
1da177e4 LT |
171 | } |
172 | ||
1da177e4 LT |
173 | err = 0; |
174 | out: | |
175 | return err; | |
1da177e4 LT |
176 | } |
177 | ||
533cb5b0 | 178 | static const struct xfrm_type ipcomp6_type = |
1da177e4 LT |
179 | { |
180 | .description = "IPCOMP6", | |
181 | .owner = THIS_MODULE, | |
182 | .proto = IPPROTO_COMP, | |
183 | .init_state = ipcomp6_init_state, | |
6fccab67 HX |
184 | .destructor = ipcomp_destroy, |
185 | .input = ipcomp_input, | |
186 | .output = ipcomp_output, | |
aee5adb4 | 187 | .hdr_offset = xfrm6_find_1stfragopt, |
1da177e4 LT |
188 | }; |
189 | ||
41135cc8 | 190 | static const struct inet6_protocol ipcomp6_protocol = |
1da177e4 LT |
191 | { |
192 | .handler = xfrm6_rcv, | |
193 | .err_handler = ipcomp6_err, | |
194 | .flags = INET6_PROTO_NOPOLICY, | |
195 | }; | |
196 | ||
197 | static int __init ipcomp6_init(void) | |
198 | { | |
199 | if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) { | |
f3213831 | 200 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
201 | return -EAGAIN; |
202 | } | |
203 | if (inet6_add_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) { | |
f3213831 | 204 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
205 | xfrm_unregister_type(&ipcomp6_type, AF_INET6); |
206 | return -EAGAIN; | |
207 | } | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static void __exit ipcomp6_fini(void) | |
212 | { | |
1ab1457c | 213 | if (inet6_del_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) |
f3213831 | 214 | pr_info("%s: can't remove protocol\n", __func__); |
1da177e4 | 215 | if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0) |
f3213831 | 216 | pr_info("%s: can't remove xfrm type\n", __func__); |
1da177e4 LT |
217 | } |
218 | ||
219 | module_init(ipcomp6_init); | |
220 | module_exit(ipcomp6_fini); | |
221 | MODULE_LICENSE("GPL"); | |
222 | MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173"); | |
223 | MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>"); | |
224 | ||
d3d6dd3a | 225 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP); |