Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 17 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 22 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | * [Memo] |
| 24 | * |
| 25 | * Outbound: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 26 | * The compression of IP datagram MUST be done before AH/ESP processing, |
| 27 | * fragmentation, and the addition of Hop-by-Hop/Routing header. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | * |
| 29 | * Inbound: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 30 | * The decompression of IP datagram MUST be done after the reassembly, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | * AH/ESP processing. |
| 32 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/module.h> |
| 34 | #include <net/ip.h> |
| 35 | #include <net/xfrm.h> |
| 36 | #include <net/ipcomp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/crypto.h> |
Herbert Xu | 4999f36 | 2007-11-07 02:21:47 -0800 | [diff] [blame] | 38 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 48 | #include <net/protocol.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/ipv6.h> |
| 50 | #include <linux/icmpv6.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 51 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 54 | int type, int code, int offset, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | { |
Al Viro | a94cfd1 | 2006-09-27 18:47:24 -0700 | [diff] [blame] | 56 | __be32 spi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; |
Herbert Xu | 87bdc48 | 2007-10-10 15:45:25 -0700 | [diff] [blame] | 58 | struct ip_comp_hdr *ipcomph = |
| 59 | (struct ip_comp_hdr *)(skb->data + offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | struct xfrm_state *x; |
| 61 | |
| 62 | if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG) |
| 63 | return; |
| 64 | |
Alexey Dobriyan | 4195f81 | 2006-05-22 16:53:22 -0700 | [diff] [blame] | 65 | spi = htonl(ntohs(ipcomph->cpi)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, IPPROTO_COMP, AF_INET6); |
| 67 | if (!x) |
| 68 | return; |
| 69 | |
Harvey Harrison | 5b095d989 | 2008-10-29 12:52:50 -0700 | [diff] [blame] | 70 | printk(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/%pI6\n", |
Harvey Harrison | 0c6ce78 | 2008-10-28 16:09:23 -0700 | [diff] [blame] | 71 | spi, &iph->daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Herbert Xu | 6abaaaa | 2006-03-26 17:37:54 -0800 | [diff] [blame] | 85 | if (!t->id.spi) |
| 86 | goto error; |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Herbert Xu | e40b328 | 2007-11-13 21:39:08 -0800 | [diff] [blame] | 91 | t->props.mode = x->props.mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); |
| 93 | |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 94 | if (xfrm_init_state(t)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | goto error; |
| 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | atomic_set(&t->tunnel_users, 1); |
| 98 | |
| 99 | out: |
| 100 | return t; |
| 101 | |
| 102 | error: |
Herbert Xu | 6abaaaa | 2006-03-26 17:37:54 -0800 | [diff] [blame] | 103 | t->km.state = XFRM_STATE_DEAD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | xfrm_state_put(t); |
Herbert Xu | 6abaaaa | 2006-03-26 17:37:54 -0800 | [diff] [blame] | 105 | t = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Al Viro | a94cfd1 | 2006-09-27 18:47:24 -0700 | [diff] [blame] | 113 | __be32 spi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Herbert Xu | 72cb696 | 2005-06-20 13:18:08 -0700 | [diff] [blame] | 135 | static int ipcomp6_init_state(struct xfrm_state *x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | { |
David S. Miller | 2c3abab | 2008-07-27 03:59:24 -0700 | [diff] [blame] | 137 | int err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | x->props.header_len = 0; |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 140 | switch (x->props.mode) { |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 141 | case XFRM_MODE_TRANSPORT: |
| 142 | break; |
| 143 | case XFRM_MODE_TUNNEL: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | x->props.header_len += sizeof(struct ipv6hdr); |
Herbert Xu | e40b328 | 2007-11-13 21:39:08 -0800 | [diff] [blame] | 145 | break; |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 146 | default: |
Herbert Xu | e40b328 | 2007-11-13 21:39:08 -0800 | [diff] [blame] | 147 | goto out; |
Herbert Xu | ca68145 | 2007-10-17 21:35:15 -0700 | [diff] [blame] | 148 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 149 | |
Herbert Xu | 6fccab6 | 2008-07-25 02:54:40 -0700 | [diff] [blame] | 150 | err = ipcomp_init_state(x); |
| 151 | if (err) |
Herbert Xu | e40b328 | 2007-11-13 21:39:08 -0800 | [diff] [blame] | 152 | goto out; |
| 153 | |
Masahide NAKAMURA | 7e49e6d | 2006-09-22 15:05:15 -0700 | [diff] [blame] | 154 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | err = ipcomp6_tunnel_attach(x); |
| 156 | if (err) |
| 157 | goto error_tunnel; |
| 158 | } |
| 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | err = 0; |
| 161 | out: |
| 162 | return err; |
| 163 | error_tunnel: |
Herbert Xu | 6fccab6 | 2008-07-25 02:54:40 -0700 | [diff] [blame] | 164 | ipcomp_destroy(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
| 166 | goto out; |
| 167 | } |
| 168 | |
Eric Dumazet | 533cb5b | 2008-01-30 19:11:50 -0800 | [diff] [blame] | 169 | static const struct xfrm_type ipcomp6_type = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | { |
| 171 | .description = "IPCOMP6", |
| 172 | .owner = THIS_MODULE, |
| 173 | .proto = IPPROTO_COMP, |
| 174 | .init_state = ipcomp6_init_state, |
Herbert Xu | 6fccab6 | 2008-07-25 02:54:40 -0700 | [diff] [blame] | 175 | .destructor = ipcomp_destroy, |
| 176 | .input = ipcomp_input, |
| 177 | .output = ipcomp_output, |
Masahide NAKAMURA | aee5adb | 2006-08-23 17:57:28 -0700 | [diff] [blame] | 178 | .hdr_offset = xfrm6_find_1stfragopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | }; |
| 180 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 181 | static struct inet6_protocol ipcomp6_protocol = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 204 | if (inet6_del_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Masahide NAKAMURA | d3d6dd3 | 2007-06-26 23:57:49 -0700 | [diff] [blame] | 216 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP); |