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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, |
d5fdd6ba | 54 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 55 | { |
d74340d3 | 56 | struct net *net = dev_net(skb->dev); |
a94cfd19 | 57 | __be32 spi; |
1da177e4 | 58 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; |
87bdc48d HX |
59 | struct ip_comp_hdr *ipcomph = |
60 | (struct ip_comp_hdr *)(skb->data + offset); | |
1da177e4 LT |
61 | struct xfrm_state *x; |
62 | ||
63 | if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG) | |
64 | return; | |
65 | ||
4195f814 | 66 | spi = htonl(ntohs(ipcomph->cpi)); |
d74340d3 | 67 | x = xfrm_state_lookup(net, (xfrm_address_t *)&iph->daddr, spi, IPPROTO_COMP, AF_INET6); |
1da177e4 LT |
68 | if (!x) |
69 | return; | |
70 | ||
5b095d98 | 71 | printk(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/%pI6\n", |
0c6ce78a | 72 | spi, &iph->daddr); |
1da177e4 LT |
73 | xfrm_state_put(x); |
74 | } | |
75 | ||
76 | static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x) | |
77 | { | |
d74340d3 | 78 | struct net *net = xs_net(x); |
1da177e4 LT |
79 | struct xfrm_state *t = NULL; |
80 | ||
d74340d3 | 81 | t = xfrm_state_alloc(net); |
1da177e4 LT |
82 | if (!t) |
83 | goto out; | |
84 | ||
85 | t->id.proto = IPPROTO_IPV6; | |
d74340d3 | 86 | t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr); |
6abaaaae HX |
87 | if (!t->id.spi) |
88 | goto error; | |
89 | ||
1da177e4 LT |
90 | memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr)); |
91 | memcpy(&t->sel, &x->sel, sizeof(t->sel)); | |
92 | t->props.family = AF_INET6; | |
e40b3286 | 93 | t->props.mode = x->props.mode; |
1da177e4 LT |
94 | memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); |
95 | ||
72cb6962 | 96 | if (xfrm_init_state(t)) |
1da177e4 LT |
97 | goto error; |
98 | ||
1da177e4 LT |
99 | atomic_set(&t->tunnel_users, 1); |
100 | ||
101 | out: | |
102 | return t; | |
103 | ||
104 | error: | |
6abaaaae | 105 | t->km.state = XFRM_STATE_DEAD; |
1da177e4 | 106 | xfrm_state_put(t); |
6abaaaae | 107 | t = NULL; |
1da177e4 LT |
108 | goto out; |
109 | } | |
110 | ||
111 | static int ipcomp6_tunnel_attach(struct xfrm_state *x) | |
112 | { | |
d74340d3 | 113 | struct net *net = xs_net(x); |
1da177e4 LT |
114 | int err = 0; |
115 | struct xfrm_state *t = NULL; | |
a94cfd19 | 116 | __be32 spi; |
1da177e4 | 117 | |
d74340d3 | 118 | spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr); |
1da177e4 | 119 | if (spi) |
d74340d3 | 120 | t = xfrm_state_lookup(net, (xfrm_address_t *)&x->id.daddr, |
1da177e4 LT |
121 | spi, IPPROTO_IPV6, AF_INET6); |
122 | if (!t) { | |
123 | t = ipcomp6_tunnel_create(x); | |
124 | if (!t) { | |
125 | err = -EINVAL; | |
126 | goto out; | |
127 | } | |
128 | xfrm_state_insert(t); | |
129 | xfrm_state_hold(t); | |
130 | } | |
131 | x->tunnel = t; | |
132 | atomic_inc(&t->tunnel_users); | |
133 | ||
134 | out: | |
135 | return err; | |
136 | } | |
137 | ||
72cb6962 | 138 | static int ipcomp6_init_state(struct xfrm_state *x) |
1da177e4 | 139 | { |
2c3abab7 | 140 | int err = -EINVAL; |
1da177e4 | 141 | |
1da177e4 | 142 | x->props.header_len = 0; |
ca68145f | 143 | switch (x->props.mode) { |
ca68145f HX |
144 | case XFRM_MODE_TRANSPORT: |
145 | break; | |
146 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 147 | x->props.header_len += sizeof(struct ipv6hdr); |
e40b3286 | 148 | break; |
ca68145f | 149 | default: |
e40b3286 | 150 | goto out; |
ca68145f | 151 | } |
1ab1457c | 152 | |
6fccab67 HX |
153 | err = ipcomp_init_state(x); |
154 | if (err) | |
e40b3286 HX |
155 | goto out; |
156 | ||
7e49e6de | 157 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
158 | err = ipcomp6_tunnel_attach(x); |
159 | if (err) | |
10e7454e | 160 | goto out; |
1da177e4 LT |
161 | } |
162 | ||
1da177e4 LT |
163 | err = 0; |
164 | out: | |
165 | return err; | |
1da177e4 LT |
166 | } |
167 | ||
533cb5b0 | 168 | static const struct xfrm_type ipcomp6_type = |
1da177e4 LT |
169 | { |
170 | .description = "IPCOMP6", | |
171 | .owner = THIS_MODULE, | |
172 | .proto = IPPROTO_COMP, | |
173 | .init_state = ipcomp6_init_state, | |
6fccab67 HX |
174 | .destructor = ipcomp_destroy, |
175 | .input = ipcomp_input, | |
176 | .output = ipcomp_output, | |
aee5adb4 | 177 | .hdr_offset = xfrm6_find_1stfragopt, |
1da177e4 LT |
178 | }; |
179 | ||
41135cc8 | 180 | static const struct inet6_protocol ipcomp6_protocol = |
1da177e4 LT |
181 | { |
182 | .handler = xfrm6_rcv, | |
183 | .err_handler = ipcomp6_err, | |
184 | .flags = INET6_PROTO_NOPOLICY, | |
185 | }; | |
186 | ||
187 | static int __init ipcomp6_init(void) | |
188 | { | |
189 | if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) { | |
190 | printk(KERN_INFO "ipcomp6 init: can't add xfrm type\n"); | |
191 | return -EAGAIN; | |
192 | } | |
193 | if (inet6_add_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) { | |
194 | printk(KERN_INFO "ipcomp6 init: can't add protocol\n"); | |
195 | xfrm_unregister_type(&ipcomp6_type, AF_INET6); | |
196 | return -EAGAIN; | |
197 | } | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static void __exit ipcomp6_fini(void) | |
202 | { | |
1ab1457c | 203 | if (inet6_del_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) |
1da177e4 LT |
204 | printk(KERN_INFO "ipv6 ipcomp close: can't remove protocol\n"); |
205 | if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0) | |
206 | printk(KERN_INFO "ipv6 ipcomp close: can't remove xfrm type\n"); | |
207 | } | |
208 | ||
209 | module_init(ipcomp6_init); | |
210 | module_exit(ipcomp6_fini); | |
211 | MODULE_LICENSE("GPL"); | |
212 | MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173"); | |
213 | MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>"); | |
214 | ||
d3d6dd3a | 215 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP); |