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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 | */ | |
1da177e4 LT |
33 | #include <linux/module.h> |
34 | #include <net/ip.h> | |
35 | #include <net/xfrm.h> | |
36 | #include <net/ipcomp.h> | |
1da177e4 | 37 | #include <linux/crypto.h> |
4999f362 | 38 | #include <linux/err.h> |
1da177e4 LT |
39 | #include <linux/pfkeyv2.h> |
40 | #include <linux/random.h> | |
41 | #include <linux/percpu.h> | |
42 | #include <linux/smp.h> | |
43 | #include <linux/list.h> | |
44 | #include <linux/vmalloc.h> | |
45 | #include <linux/rtnetlink.h> | |
46 | #include <net/icmp.h> | |
47 | #include <net/ipv6.h> | |
14c85021 | 48 | #include <net/protocol.h> |
1da177e4 LT |
49 | #include <linux/ipv6.h> |
50 | #include <linux/icmpv6.h> | |
4a3e2f71 | 51 | #include <linux/mutex.h> |
1da177e4 | 52 | |
1da177e4 | 53 | static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
1ab1457c | 54 | int type, int code, int offset, __be32 info) |
1da177e4 | 55 | { |
a94cfd19 | 56 | __be32 spi; |
1da177e4 | 57 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; |
87bdc48d HX |
58 | struct ip_comp_hdr *ipcomph = |
59 | (struct ip_comp_hdr *)(skb->data + offset); | |
1da177e4 LT |
60 | struct xfrm_state *x; |
61 | ||
62 | if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG) | |
63 | return; | |
64 | ||
4195f814 | 65 | spi = htonl(ntohs(ipcomph->cpi)); |
1da177e4 LT |
66 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, IPPROTO_COMP, AF_INET6); |
67 | if (!x) | |
68 | return; | |
69 | ||
5b095d98 | 70 | printk(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/%pI6\n", |
0c6ce78a | 71 | spi, &iph->daddr); |
1da177e4 LT |
72 | xfrm_state_put(x); |
73 | } | |
74 | ||
75 | static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x) | |
76 | { | |
77 | struct xfrm_state *t = NULL; | |
78 | ||
79 | t = xfrm_state_alloc(); | |
80 | if (!t) | |
81 | goto out; | |
82 | ||
83 | t->id.proto = IPPROTO_IPV6; | |
84 | t->id.spi = xfrm6_tunnel_alloc_spi((xfrm_address_t *)&x->props.saddr); | |
6abaaaae HX |
85 | if (!t->id.spi) |
86 | goto error; | |
87 | ||
1da177e4 LT |
88 | memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr)); |
89 | memcpy(&t->sel, &x->sel, sizeof(t->sel)); | |
90 | t->props.family = AF_INET6; | |
e40b3286 | 91 | t->props.mode = x->props.mode; |
1da177e4 LT |
92 | memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); |
93 | ||
72cb6962 | 94 | if (xfrm_init_state(t)) |
1da177e4 LT |
95 | goto error; |
96 | ||
1da177e4 LT |
97 | atomic_set(&t->tunnel_users, 1); |
98 | ||
99 | out: | |
100 | return t; | |
101 | ||
102 | error: | |
6abaaaae | 103 | t->km.state = XFRM_STATE_DEAD; |
1da177e4 | 104 | xfrm_state_put(t); |
6abaaaae | 105 | t = NULL; |
1da177e4 LT |
106 | goto out; |
107 | } | |
108 | ||
109 | static int ipcomp6_tunnel_attach(struct xfrm_state *x) | |
110 | { | |
111 | int err = 0; | |
112 | struct xfrm_state *t = NULL; | |
a94cfd19 | 113 | __be32 spi; |
1da177e4 LT |
114 | |
115 | spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&x->props.saddr); | |
116 | if (spi) | |
117 | t = xfrm_state_lookup((xfrm_address_t *)&x->id.daddr, | |
118 | spi, IPPROTO_IPV6, AF_INET6); | |
119 | if (!t) { | |
120 | t = ipcomp6_tunnel_create(x); | |
121 | if (!t) { | |
122 | err = -EINVAL; | |
123 | goto out; | |
124 | } | |
125 | xfrm_state_insert(t); | |
126 | xfrm_state_hold(t); | |
127 | } | |
128 | x->tunnel = t; | |
129 | atomic_inc(&t->tunnel_users); | |
130 | ||
131 | out: | |
132 | return err; | |
133 | } | |
134 | ||
72cb6962 | 135 | static int ipcomp6_init_state(struct xfrm_state *x) |
1da177e4 | 136 | { |
2c3abab7 | 137 | int err = -EINVAL; |
1da177e4 | 138 | |
1da177e4 | 139 | x->props.header_len = 0; |
ca68145f | 140 | switch (x->props.mode) { |
ca68145f HX |
141 | case XFRM_MODE_TRANSPORT: |
142 | break; | |
143 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 144 | x->props.header_len += sizeof(struct ipv6hdr); |
e40b3286 | 145 | break; |
ca68145f | 146 | default: |
e40b3286 | 147 | goto out; |
ca68145f | 148 | } |
1ab1457c | 149 | |
6fccab67 HX |
150 | err = ipcomp_init_state(x); |
151 | if (err) | |
e40b3286 HX |
152 | goto out; |
153 | ||
7e49e6de | 154 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
155 | err = ipcomp6_tunnel_attach(x); |
156 | if (err) | |
157 | goto error_tunnel; | |
158 | } | |
159 | ||
1da177e4 LT |
160 | err = 0; |
161 | out: | |
162 | return err; | |
163 | error_tunnel: | |
6fccab67 | 164 | ipcomp_destroy(x); |
1da177e4 LT |
165 | |
166 | goto out; | |
167 | } | |
168 | ||
533cb5b0 | 169 | static const struct xfrm_type ipcomp6_type = |
1da177e4 LT |
170 | { |
171 | .description = "IPCOMP6", | |
172 | .owner = THIS_MODULE, | |
173 | .proto = IPPROTO_COMP, | |
174 | .init_state = ipcomp6_init_state, | |
6fccab67 HX |
175 | .destructor = ipcomp_destroy, |
176 | .input = ipcomp_input, | |
177 | .output = ipcomp_output, | |
aee5adb4 | 178 | .hdr_offset = xfrm6_find_1stfragopt, |
1da177e4 LT |
179 | }; |
180 | ||
1ab1457c | 181 | static struct inet6_protocol ipcomp6_protocol = |
1da177e4 LT |
182 | { |
183 | .handler = xfrm6_rcv, | |
184 | .err_handler = ipcomp6_err, | |
185 | .flags = INET6_PROTO_NOPOLICY, | |
186 | }; | |
187 | ||
188 | static int __init ipcomp6_init(void) | |
189 | { | |
190 | if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) { | |
191 | printk(KERN_INFO "ipcomp6 init: can't add xfrm type\n"); | |
192 | return -EAGAIN; | |
193 | } | |
194 | if (inet6_add_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) { | |
195 | printk(KERN_INFO "ipcomp6 init: can't add protocol\n"); | |
196 | xfrm_unregister_type(&ipcomp6_type, AF_INET6); | |
197 | return -EAGAIN; | |
198 | } | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static void __exit ipcomp6_fini(void) | |
203 | { | |
1ab1457c | 204 | if (inet6_del_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) |
1da177e4 LT |
205 | printk(KERN_INFO "ipv6 ipcomp close: can't remove protocol\n"); |
206 | if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0) | |
207 | printk(KERN_INFO "ipv6 ipcomp close: can't remove xfrm type\n"); | |
208 | } | |
209 | ||
210 | module_init(ipcomp6_init); | |
211 | module_exit(ipcomp6_fini); | |
212 | MODULE_LICENSE("GPL"); | |
213 | MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173"); | |
214 | MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>"); | |
215 | ||
d3d6dd3a | 216 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP); |