blob: 28fc8edfdc3aa63f24f85df71869809d27df7e71 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 Hideaki1ab14572007-02-09 23:24:49 +090012 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * 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 Hideaki1ab14572007-02-09 23:24:49 +090017 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * 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 Hideaki1ab14572007-02-09 23:24:49 +090022/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 * [Memo]
24 *
25 * Outbound:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090026 * The compression of IP datagram MUST be done before AH/ESP processing,
27 * fragmentation, and the addition of Hop-by-Hop/Routing header.
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 *
29 * Inbound:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090030 * The decompression of IP datagram MUST be done after the reassembly,
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 * AH/ESP processing.
32 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/module.h>
34#include <net/ip.h>
35#include <net/xfrm.h>
36#include <net/ipcomp.h>
37#include <asm/scatterlist.h>
38#include <asm/semaphore.h>
39#include <linux/crypto.h>
40#include <linux/pfkeyv2.h>
41#include <linux/random.h>
42#include <linux/percpu.h>
43#include <linux/smp.h>
44#include <linux/list.h>
45#include <linux/vmalloc.h>
46#include <linux/rtnetlink.h>
47#include <net/icmp.h>
48#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020049#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/ipv6.h>
51#include <linux/icmpv6.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080052#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54struct ipcomp6_tfms {
55 struct list_head list;
Herbert Xue4d5b792006-08-26 18:12:40 +100056 struct crypto_comp **tfms;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 int users;
58};
59
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080060static DEFINE_MUTEX(ipcomp6_resource_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061static void **ipcomp6_scratches;
62static int ipcomp6_scratch_users;
63static LIST_HEAD(ipcomp6_tfms_list);
64
Herbert Xue6956332006-04-01 00:52:46 -080065static int ipcomp6_input(struct xfrm_state *x, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066{
Herbert Xu364c6ba2006-06-09 16:10:40 -070067 int err = -ENOMEM;
Herbert Xu87bdc482007-10-10 15:45:25 -070068 struct ip_comp_hdr *ipch;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 int plen, dlen;
70 struct ipcomp_data *ipcd = x->data;
71 u8 *start, *scratch;
Herbert Xue4d5b792006-08-26 18:12:40 +100072 struct crypto_comp *tfm;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 int cpu;
74
Herbert Xu364c6ba2006-06-09 16:10:40 -070075 if (skb_linearize_cow(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78 skb->ip_summed = CHECKSUM_NONE;
79
80 /* Remove ipcomp header and decompress original payload */
Herbert Xu31a4ab92006-05-27 23:06:13 -070081 ipch = (void *)skb->data;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -070082 skb->transport_header = skb->network_header + sizeof(*ipch);
Herbert Xu31a4ab92006-05-27 23:06:13 -070083 __skb_pull(skb, sizeof(*ipch));
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85 /* decompression */
86 plen = skb->len;
87 dlen = IPCOMP_SCRATCH_SIZE;
88 start = skb->data;
89
90 cpu = get_cpu();
91 scratch = *per_cpu_ptr(ipcomp6_scratches, cpu);
92 tfm = *per_cpu_ptr(ipcd->tfms, cpu);
93
94 err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
Herbert Xu87bdc482007-10-10 15:45:25 -070095 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 goto out_put_cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Herbert Xu87bdc482007-10-10 15:45:25 -070098 if (dlen < (plen + sizeof(*ipch))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 err = -EINVAL;
100 goto out_put_cpu;
101 }
102
103 err = pskb_expand_head(skb, 0, dlen - plen, GFP_ATOMIC);
104 if (err) {
105 goto out_put_cpu;
106 }
107
Herbert Xuda952312006-07-11 13:50:09 -0700108 skb->truesize += dlen - plen;
109 __skb_put(skb, dlen - plen);
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300110 skb_copy_to_linear_data(skb, scratch, dlen);
Herbert Xu31a4ab92006-05-27 23:06:13 -0700111 err = ipch->nexthdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113out_put_cpu:
114 put_cpu();
115out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return err;
117}
118
119static int ipcomp6_output(struct xfrm_state *x, struct sk_buff *skb)
120{
121 int err;
Herbert Xu87bdc482007-10-10 15:45:25 -0700122 struct ip_comp_hdr *ipch;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 struct ipcomp_data *ipcd = x->data;
124 int plen, dlen;
125 u8 *start, *scratch;
Herbert Xue4d5b792006-08-26 18:12:40 +1000126 struct crypto_comp *tfm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 /* check whether datagram len is larger than threshold */
Herbert Xuceb1eec82007-10-10 15:45:52 -0700130 if (skb->len < ipcd->threshold) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 goto out_ok;
132 }
133
Herbert Xu364c6ba2006-06-09 16:10:40 -0700134 if (skb_linearize_cow(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 goto out_ok;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 /* compression */
Herbert Xuceb1eec82007-10-10 15:45:52 -0700138 plen = skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 dlen = IPCOMP_SCRATCH_SIZE;
Herbert Xuceb1eec82007-10-10 15:45:52 -0700140 start = skb->data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 cpu = get_cpu();
143 scratch = *per_cpu_ptr(ipcomp6_scratches, cpu);
144 tfm = *per_cpu_ptr(ipcd->tfms, cpu);
145
146 err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
Herbert Xu87bdc482007-10-10 15:45:25 -0700147 if (err || (dlen + sizeof(*ipch)) >= plen) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 put_cpu();
149 goto out_ok;
150 }
151 memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
152 put_cpu();
Herbert Xuceb1eec82007-10-10 15:45:52 -0700153 pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155 /* insert ipcomp header and replace datagram */
Herbert Xu87bdc482007-10-10 15:45:25 -0700156 ipch = ip_comp_hdr(skb);
Herbert Xu007f0212007-10-09 13:25:59 -0700157 ipch->nexthdr = *skb_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 ipch->flags = 0;
159 ipch->cpi = htons((u16 )ntohl(x->id.spi));
Herbert Xu007f0212007-10-09 13:25:59 -0700160 *skb_mac_header(skb) = IPPROTO_COMP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162out_ok:
Herbert Xuceb1eec82007-10-10 15:45:52 -0700163 skb_push(skb, -skb_network_offset(skb));
164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 return 0;
166}
167
168static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900169 int type, int code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
Al Viroa94cfd12006-09-27 18:47:24 -0700171 __be32 spi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
Herbert Xu87bdc482007-10-10 15:45:25 -0700173 struct ip_comp_hdr *ipcomph =
174 (struct ip_comp_hdr *)(skb->data + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 struct xfrm_state *x;
176
177 if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG)
178 return;
179
Alexey Dobriyan4195f812006-05-22 16:53:22 -0700180 spi = htonl(ntohs(ipcomph->cpi));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi, IPPROTO_COMP, AF_INET6);
182 if (!x)
183 return;
184
Joe Perches46b86a22006-01-13 14:29:07 -0800185 printk(KERN_DEBUG "pmtu discovery on SA IPCOMP/%08x/" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 spi, NIP6(iph->daddr));
187 xfrm_state_put(x);
188}
189
190static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
191{
192 struct xfrm_state *t = NULL;
Diego Beltrami0a694522006-10-03 23:47:05 -0700193 u8 mode = XFRM_MODE_TUNNEL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195 t = xfrm_state_alloc();
196 if (!t)
197 goto out;
198
199 t->id.proto = IPPROTO_IPV6;
200 t->id.spi = xfrm6_tunnel_alloc_spi((xfrm_address_t *)&x->props.saddr);
Herbert Xu6abaaaa2006-03-26 17:37:54 -0800201 if (!t->id.spi)
202 goto error;
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
205 memcpy(&t->sel, &x->sel, sizeof(t->sel));
206 t->props.family = AF_INET6;
Diego Beltrami0a694522006-10-03 23:47:05 -0700207 if (x->props.mode == XFRM_MODE_BEET)
208 mode = x->props.mode;
209 t->props.mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
211
Herbert Xu72cb6962005-06-20 13:18:08 -0700212 if (xfrm_init_state(t))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 goto error;
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 atomic_set(&t->tunnel_users, 1);
216
217out:
218 return t;
219
220error:
Herbert Xu6abaaaa2006-03-26 17:37:54 -0800221 t->km.state = XFRM_STATE_DEAD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 xfrm_state_put(t);
Herbert Xu6abaaaa2006-03-26 17:37:54 -0800223 t = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 goto out;
225}
226
227static int ipcomp6_tunnel_attach(struct xfrm_state *x)
228{
229 int err = 0;
230 struct xfrm_state *t = NULL;
Al Viroa94cfd12006-09-27 18:47:24 -0700231 __be32 spi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233 spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&x->props.saddr);
234 if (spi)
235 t = xfrm_state_lookup((xfrm_address_t *)&x->id.daddr,
236 spi, IPPROTO_IPV6, AF_INET6);
237 if (!t) {
238 t = ipcomp6_tunnel_create(x);
239 if (!t) {
240 err = -EINVAL;
241 goto out;
242 }
243 xfrm_state_insert(t);
244 xfrm_state_hold(t);
245 }
246 x->tunnel = t;
247 atomic_inc(&t->tunnel_users);
248
249out:
250 return err;
251}
252
253static void ipcomp6_free_scratches(void)
254{
255 int i;
256 void **scratches;
257
258 if (--ipcomp6_scratch_users)
259 return;
260
261 scratches = ipcomp6_scratches;
262 if (!scratches)
263 return;
264
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -0700265 for_each_possible_cpu(i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 void *scratch = *per_cpu_ptr(scratches, i);
Jesper Juhl2b191be2006-03-20 17:46:29 -0800267
268 vfree(scratch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 }
270
271 free_percpu(scratches);
272}
273
274static void **ipcomp6_alloc_scratches(void)
275{
276 int i;
277 void **scratches;
278
279 if (ipcomp6_scratch_users++)
280 return ipcomp6_scratches;
281
282 scratches = alloc_percpu(void *);
283 if (!scratches)
284 return NULL;
285
286 ipcomp6_scratches = scratches;
287
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -0700288 for_each_possible_cpu(i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 void *scratch = vmalloc(IPCOMP_SCRATCH_SIZE);
290 if (!scratch)
291 return NULL;
292 *per_cpu_ptr(scratches, i) = scratch;
293 }
294
295 return scratches;
296}
297
Herbert Xue4d5b792006-08-26 18:12:40 +1000298static void ipcomp6_free_tfms(struct crypto_comp **tfms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
300 struct ipcomp6_tfms *pos;
301 int cpu;
302
303 list_for_each_entry(pos, &ipcomp6_tfms_list, list) {
304 if (pos->tfms == tfms)
305 break;
306 }
307
308 BUG_TRAP(pos);
309
310 if (--pos->users)
311 return;
312
313 list_del(&pos->list);
314 kfree(pos);
315
316 if (!tfms)
317 return;
318
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -0700319 for_each_possible_cpu(cpu) {
Herbert Xue4d5b792006-08-26 18:12:40 +1000320 struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu);
321 crypto_free_comp(tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 }
323 free_percpu(tfms);
324}
325
Herbert Xue4d5b792006-08-26 18:12:40 +1000326static struct crypto_comp **ipcomp6_alloc_tfms(const char *alg_name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327{
328 struct ipcomp6_tfms *pos;
Herbert Xue4d5b792006-08-26 18:12:40 +1000329 struct crypto_comp **tfms;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 int cpu;
331
332 /* This can be any valid CPU ID so we don't need locking. */
Herbert Xu6fc8b9e2005-08-18 14:36:59 -0700333 cpu = raw_smp_processor_id();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 list_for_each_entry(pos, &ipcomp6_tfms_list, list) {
Herbert Xue4d5b792006-08-26 18:12:40 +1000336 struct crypto_comp *tfm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 tfms = pos->tfms;
339 tfm = *per_cpu_ptr(tfms, cpu);
340
Herbert Xue4d5b792006-08-26 18:12:40 +1000341 if (!strcmp(crypto_comp_name(tfm), alg_name)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 pos->users++;
343 return tfms;
344 }
345 }
346
347 pos = kmalloc(sizeof(*pos), GFP_KERNEL);
348 if (!pos)
349 return NULL;
350
351 pos->users = 1;
352 INIT_LIST_HEAD(&pos->list);
353 list_add(&pos->list, &ipcomp6_tfms_list);
354
Herbert Xue4d5b792006-08-26 18:12:40 +1000355 pos->tfms = tfms = alloc_percpu(struct crypto_comp *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 if (!tfms)
357 goto error;
358
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -0700359 for_each_possible_cpu(cpu) {
Herbert Xue4d5b792006-08-26 18:12:40 +1000360 struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0,
361 CRYPTO_ALG_ASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (!tfm)
363 goto error;
364 *per_cpu_ptr(tfms, cpu) = tfm;
365 }
366
367 return tfms;
368
369error:
370 ipcomp6_free_tfms(tfms);
371 return NULL;
372}
373
374static void ipcomp6_free_data(struct ipcomp_data *ipcd)
375{
376 if (ipcd->tfms)
377 ipcomp6_free_tfms(ipcd->tfms);
378 ipcomp6_free_scratches();
379}
380
381static void ipcomp6_destroy(struct xfrm_state *x)
382{
383 struct ipcomp_data *ipcd = x->data;
384 if (!ipcd)
385 return;
386 xfrm_state_delete_tunnel(x);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800387 mutex_lock(&ipcomp6_resource_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 ipcomp6_free_data(ipcd);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800389 mutex_unlock(&ipcomp6_resource_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 kfree(ipcd);
391
392 xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
393}
394
Herbert Xu72cb6962005-06-20 13:18:08 -0700395static int ipcomp6_init_state(struct xfrm_state *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396{
397 int err;
398 struct ipcomp_data *ipcd;
399 struct xfrm_algo_desc *calg_desc;
400
401 err = -EINVAL;
402 if (!x->calg)
403 goto out;
404
405 if (x->encap)
406 goto out;
407
408 err = -ENOMEM;
Ingo Oeser0c600ed2006-03-20 23:01:32 -0800409 ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 if (!ipcd)
411 goto out;
412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 x->props.header_len = 0;
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700414 if (x->props.mode == XFRM_MODE_TUNNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 x->props.header_len += sizeof(struct ipv6hdr);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900416
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800417 mutex_lock(&ipcomp6_resource_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 if (!ipcomp6_alloc_scratches())
419 goto error;
420
421 ipcd->tfms = ipcomp6_alloc_tfms(x->calg->alg_name);
422 if (!ipcd->tfms)
423 goto error;
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800424 mutex_unlock(&ipcomp6_resource_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700426 if (x->props.mode == XFRM_MODE_TUNNEL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 err = ipcomp6_tunnel_attach(x);
428 if (err)
429 goto error_tunnel;
430 }
431
432 calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0);
433 BUG_ON(!calg_desc);
434 ipcd->threshold = calg_desc->uinfo.comp.threshold;
435 x->data = ipcd;
436 err = 0;
437out:
438 return err;
439error_tunnel:
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800440 mutex_lock(&ipcomp6_resource_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441error:
442 ipcomp6_free_data(ipcd);
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -0800443 mutex_unlock(&ipcomp6_resource_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 kfree(ipcd);
445
446 goto out;
447}
448
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900449static struct xfrm_type ipcomp6_type =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450{
451 .description = "IPCOMP6",
452 .owner = THIS_MODULE,
453 .proto = IPPROTO_COMP,
454 .init_state = ipcomp6_init_state,
455 .destructor = ipcomp6_destroy,
456 .input = ipcomp6_input,
457 .output = ipcomp6_output,
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700458 .hdr_offset = xfrm6_find_1stfragopt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459};
460
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900461static struct inet6_protocol ipcomp6_protocol =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
463 .handler = xfrm6_rcv,
464 .err_handler = ipcomp6_err,
465 .flags = INET6_PROTO_NOPOLICY,
466};
467
468static int __init ipcomp6_init(void)
469{
470 if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) {
471 printk(KERN_INFO "ipcomp6 init: can't add xfrm type\n");
472 return -EAGAIN;
473 }
474 if (inet6_add_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0) {
475 printk(KERN_INFO "ipcomp6 init: can't add protocol\n");
476 xfrm_unregister_type(&ipcomp6_type, AF_INET6);
477 return -EAGAIN;
478 }
479 return 0;
480}
481
482static void __exit ipcomp6_fini(void)
483{
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900484 if (inet6_del_protocol(&ipcomp6_protocol, IPPROTO_COMP) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 printk(KERN_INFO "ipv6 ipcomp close: can't remove protocol\n");
486 if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0)
487 printk(KERN_INFO "ipv6 ipcomp close: can't remove xfrm type\n");
488}
489
490module_init(ipcomp6_init);
491module_exit(ipcomp6_fini);
492MODULE_LICENSE("GPL");
493MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173");
494MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>");
495
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -0700496MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP);