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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 | ||
ec18d9a2 DM |
67 | if (type != ICMPV6_DEST_UNREACH && |
68 | type != ICMPV6_PKT_TOOBIG && | |
69 | type != NDISC_REDIRECT) | |
1da177e4 LT |
70 | return; |
71 | ||
4195f814 | 72 | spi = htonl(ntohs(ipcomph->cpi)); |
b71d1d42 ED |
73 | x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
74 | spi, IPPROTO_COMP, AF_INET6); | |
1da177e4 LT |
75 | if (!x) |
76 | return; | |
77 | ||
ec18d9a2 DM |
78 | if (type == NDISC_REDIRECT) |
79 | ip6_redirect(skb, net, 0, 0); | |
80 | else | |
81 | ip6_update_pmtu(skb, net, info, 0, 0); | |
1da177e4 LT |
82 | xfrm_state_put(x); |
83 | } | |
84 | ||
85 | static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x) | |
86 | { | |
d74340d3 | 87 | struct net *net = xs_net(x); |
1da177e4 LT |
88 | struct xfrm_state *t = NULL; |
89 | ||
d74340d3 | 90 | t = xfrm_state_alloc(net); |
1da177e4 LT |
91 | if (!t) |
92 | goto out; | |
93 | ||
94 | t->id.proto = IPPROTO_IPV6; | |
d74340d3 | 95 | t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr); |
6abaaaae HX |
96 | if (!t->id.spi) |
97 | goto error; | |
98 | ||
1da177e4 LT |
99 | memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr)); |
100 | memcpy(&t->sel, &x->sel, sizeof(t->sel)); | |
101 | t->props.family = AF_INET6; | |
e40b3286 | 102 | t->props.mode = x->props.mode; |
1da177e4 | 103 | memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); |
bd55775c | 104 | memcpy(&t->mark, &x->mark, sizeof(t->mark)); |
1da177e4 | 105 | |
72cb6962 | 106 | if (xfrm_init_state(t)) |
1da177e4 LT |
107 | goto error; |
108 | ||
1da177e4 LT |
109 | atomic_set(&t->tunnel_users, 1); |
110 | ||
111 | out: | |
112 | return t; | |
113 | ||
114 | error: | |
6abaaaae | 115 | t->km.state = XFRM_STATE_DEAD; |
1da177e4 | 116 | xfrm_state_put(t); |
6abaaaae | 117 | t = NULL; |
1da177e4 LT |
118 | goto out; |
119 | } | |
120 | ||
121 | static int ipcomp6_tunnel_attach(struct xfrm_state *x) | |
122 | { | |
d74340d3 | 123 | struct net *net = xs_net(x); |
1da177e4 LT |
124 | int err = 0; |
125 | struct xfrm_state *t = NULL; | |
a94cfd19 | 126 | __be32 spi; |
bd55775c | 127 | u32 mark = x->mark.m & x->mark.v; |
1da177e4 | 128 | |
d74340d3 | 129 | spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr); |
1da177e4 | 130 | if (spi) |
bd55775c | 131 | t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr, |
1da177e4 LT |
132 | spi, IPPROTO_IPV6, AF_INET6); |
133 | if (!t) { | |
134 | t = ipcomp6_tunnel_create(x); | |
135 | if (!t) { | |
136 | err = -EINVAL; | |
137 | goto out; | |
138 | } | |
139 | xfrm_state_insert(t); | |
140 | xfrm_state_hold(t); | |
141 | } | |
142 | x->tunnel = t; | |
143 | atomic_inc(&t->tunnel_users); | |
144 | ||
145 | out: | |
146 | return err; | |
147 | } | |
148 | ||
72cb6962 | 149 | static int ipcomp6_init_state(struct xfrm_state *x) |
1da177e4 | 150 | { |
2c3abab7 | 151 | int err = -EINVAL; |
1da177e4 | 152 | |
1da177e4 | 153 | x->props.header_len = 0; |
ca68145f | 154 | switch (x->props.mode) { |
ca68145f HX |
155 | case XFRM_MODE_TRANSPORT: |
156 | break; | |
157 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 158 | x->props.header_len += sizeof(struct ipv6hdr); |
e40b3286 | 159 | break; |
ca68145f | 160 | default: |
e40b3286 | 161 | goto out; |
ca68145f | 162 | } |
1ab1457c | 163 | |
6fccab67 HX |
164 | err = ipcomp_init_state(x); |
165 | if (err) | |
e40b3286 HX |
166 | goto out; |
167 | ||
7e49e6de | 168 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
169 | err = ipcomp6_tunnel_attach(x); |
170 | if (err) | |
10e7454e | 171 | goto out; |
1da177e4 LT |
172 | } |
173 | ||
1da177e4 LT |
174 | err = 0; |
175 | out: | |
176 | return err; | |
1da177e4 LT |
177 | } |
178 | ||
533cb5b0 | 179 | static const struct xfrm_type ipcomp6_type = |
1da177e4 LT |
180 | { |
181 | .description = "IPCOMP6", | |
182 | .owner = THIS_MODULE, | |
183 | .proto = IPPROTO_COMP, | |
184 | .init_state = ipcomp6_init_state, | |
6fccab67 HX |
185 | .destructor = ipcomp_destroy, |
186 | .input = ipcomp_input, | |
187 | .output = ipcomp_output, | |
aee5adb4 | 188 | .hdr_offset = xfrm6_find_1stfragopt, |
1da177e4 LT |
189 | }; |
190 | ||
41135cc8 | 191 | static const struct inet6_protocol ipcomp6_protocol = |
1da177e4 LT |
192 | { |
193 | .handler = xfrm6_rcv, | |
194 | .err_handler = ipcomp6_err, | |
195 | .flags = INET6_PROTO_NOPOLICY, | |
196 | }; | |
197 | ||
198 | static int __init ipcomp6_init(void) | |
199 | { | |
200 | if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) { | |
f3213831 | 201 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
202 | return -EAGAIN; |
203 | } | |
204 | if (inet6_add_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) { | |
f3213831 | 205 | pr_info("%s: can't add protocol\n", __func__); |
1da177e4 LT |
206 | xfrm_unregister_type(&ipcomp6_type, AF_INET6); |
207 | return -EAGAIN; | |
208 | } | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static void __exit ipcomp6_fini(void) | |
213 | { | |
1ab1457c | 214 | if (inet6_del_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) |
f3213831 | 215 | pr_info("%s: can't remove protocol\n", __func__); |
1da177e4 | 216 | if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0) |
f3213831 | 217 | pr_info("%s: can't remove xfrm type\n", __func__); |
1da177e4 LT |
218 | } |
219 | ||
220 | module_init(ipcomp6_init); | |
221 | module_exit(ipcomp6_fini); | |
222 | MODULE_LICENSE("GPL"); | |
223 | MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173"); | |
224 | MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>"); | |
225 | ||
d3d6dd3a | 226 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP); |