blob: 9fc19400b851f9971d12ff1c8cff7bc267e7339b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C)2002 USAGI/WIDE Project
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090013 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Authors
19 *
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090020 * Mitsuru KANDA @USAGI : IPv6 Support
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 * Kazunori MIYAZAWA @USAGI :
22 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +090023 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 * This file is derived from net/ipv4/esp.c
25 */
26
Herbert Xu6b7326c2006-07-30 15:41:01 +100027#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/module.h>
29#include <net/ip.h>
30#include <net/xfrm.h>
31#include <net/esp.h>
32#include <asm/scatterlist.h>
33#include <linux/crypto.h>
Herbert Xua02a6422005-10-10 21:11:08 -070034#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/pfkeyv2.h>
36#include <linux/random.h>
37#include <net/icmp.h>
38#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020039#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/icmpv6.h>
41
42static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
43{
44 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 struct ipv6hdr *top_iph;
46 struct ipv6_esp_hdr *esph;
Herbert Xu6b7326c2006-07-30 15:41:01 +100047 struct crypto_blkcipher *tfm;
48 struct blkcipher_desc desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 struct sk_buff *trailer;
50 int blksize;
51 int clen;
52 int alen;
53 int nfrags;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -070054 u8 *tail;
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -070055 struct esp_data *esp = x->data;
56 int hdr_len = (skb_transport_offset(skb) +
57 sizeof(*esph) + esp->conf.ivlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 /* Strip IP+ESP header. */
60 __skb_pull(skb, hdr_len);
61
62 /* Now skb is pure payload to encrypt */
63 err = -ENOMEM;
64
65 /* Round to block size */
66 clen = skb->len;
67
68 alen = esp->auth.icv_trunc_len;
69 tfm = esp->conf.tfm;
Herbert Xu6b7326c2006-07-30 15:41:01 +100070 desc.tfm = tfm;
71 desc.flags = 0;
72 blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
Herbert Xua02a6422005-10-10 21:11:08 -070073 clen = ALIGN(clen + 2, blksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 if (esp->conf.padlen)
Herbert Xua02a6422005-10-10 21:11:08 -070075 clen = ALIGN(clen, esp->conf.padlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) {
78 goto error;
79 }
80
81 /* Fill padding... */
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -070082 tail = skb_tail_pointer(trailer);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 do {
84 int i;
85 for (i=0; i<clen-skb->len - 2; i++)
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -070086 tail[i] = i + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 } while (0);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -070088 tail[clen-skb->len - 2] = (clen - skb->len) - 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 pskb_put(skb, trailer, clen - skb->len);
90
Herbert Xu007f0212007-10-09 13:25:59 -070091 __skb_push(skb, -skb_network_offset(skb));
92 top_iph = ipv6_hdr(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -070093 esph = (struct ipv6_esp_hdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph));
Herbert Xu007f0212007-10-09 13:25:59 -070095 *(skb_tail_pointer(trailer) - 1) = *skb_mac_header(skb);
96 *skb_mac_header(skb) = IPPROTO_ESP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98 esph->spi = x->id.spi;
Herbert Xu436a0a42007-10-08 17:25:53 -070099 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
David S. Millere4bec822006-09-22 15:17:35 -0700101 if (esp->conf.ivlen) {
102 if (unlikely(!esp->conf.ivinitted)) {
103 get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
104 esp->conf.ivinitted = 1;
105 }
Herbert Xu6b7326c2006-07-30 15:41:01 +1000106 crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
David S. Millere4bec822006-09-22 15:17:35 -0700107 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109 do {
110 struct scatterlist *sg = &esp->sgbuf[0];
111
112 if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
113 sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
114 if (!sg)
115 goto error;
116 }
117 skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
Herbert Xu6b7326c2006-07-30 15:41:01 +1000118 err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (unlikely(sg != &esp->sgbuf[0]))
120 kfree(sg);
121 } while (0);
122
Herbert Xu6b7326c2006-07-30 15:41:01 +1000123 if (unlikely(err))
124 goto error;
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 if (esp->conf.ivlen) {
Herbert Xu6b7326c2006-07-30 15:41:01 +1000127 memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
128 crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 }
130
131 if (esp->auth.icv_full_len) {
Herbert Xu07d4ee52006-08-20 14:24:50 +1000132 err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data,
133 sizeof(*esph) + esp->conf.ivlen + clen);
134 memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 }
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137error:
138 return err;
139}
140
Herbert Xue6956332006-04-01 00:52:46 -0800141static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
143 struct ipv6hdr *iph;
144 struct ipv6_esp_hdr *esph;
145 struct esp_data *esp = x->data;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000146 struct crypto_blkcipher *tfm = esp->conf.tfm;
147 struct blkcipher_desc desc = { .tfm = tfm };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 struct sk_buff *trailer;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000149 int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 int alen = esp->auth.icv_trunc_len;
151 int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen;
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300152 int hdr_len = skb_network_header_len(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 int nfrags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 int ret = 0;
155
156 if (!pskb_may_pull(skb, sizeof(struct ipv6_esp_hdr))) {
157 ret = -EINVAL;
Herbert Xu31a4ab92006-05-27 23:06:13 -0700158 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 }
160
161 if (elen <= 0 || (elen & (blksize-1))) {
162 ret = -EINVAL;
Herbert Xu31a4ab92006-05-27 23:06:13 -0700163 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 /* If integrity check is required, do this. */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900167 if (esp->auth.icv_full_len) {
Herbert Xu07d4ee52006-08-20 14:24:50 +1000168 u8 sum[alen];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Herbert Xu07d4ee52006-08-20 14:24:50 +1000170 ret = esp_mac_digest(esp, skb, 0, skb->len - alen);
171 if (ret)
172 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Herbert Xu07d4ee52006-08-20 14:24:50 +1000174 if (skb_copy_bits(skb, skb->len - alen, sum, alen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 BUG();
176
Herbert Xu07d4ee52006-08-20 14:24:50 +1000177 if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 x->stats.integrity_failed++;
179 ret = -EINVAL;
180 goto out;
181 }
182 }
183
184 if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) {
185 ret = -EINVAL;
186 goto out;
187 }
188
189 skb->ip_summed = CHECKSUM_NONE;
190
191 esph = (struct ipv6_esp_hdr*)skb->data;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700192 iph = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 /* Get ivec. This can be wrong, check against another impls. */
195 if (esp->conf.ivlen)
Herbert Xu6b7326c2006-07-30 15:41:01 +1000196 crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900198 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 u8 nexthdr[2];
200 struct scatterlist *sg = &esp->sgbuf[0];
201 u8 padlen;
202
203 if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
204 sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
205 if (!sg) {
206 ret = -ENOMEM;
207 goto out;
208 }
209 }
210 skb_to_sgvec(skb, sg, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen, elen);
Herbert Xu6b7326c2006-07-30 15:41:01 +1000211 ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 if (unlikely(sg != &esp->sgbuf[0]))
213 kfree(sg);
Herbert Xu6b7326c2006-07-30 15:41:01 +1000214 if (unlikely(ret))
215 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217 if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
218 BUG();
219
220 padlen = nexthdr[0];
221 if (padlen+2 >= elen) {
Patrick McHardy64ce2072005-08-09 20:50:53 -0700222 LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 ret = -EINVAL;
224 goto out;
225 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900226 /* ... check padding bits here. Silly. :-) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 pskb_trim(skb, skb->len - alen - padlen - 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 ret = nexthdr[1];
230 }
231
Arnaldo Carvalho de Melo967b05f2007-03-13 13:51:52 -0300232 __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen);
233 skb_set_transport_header(skb, -hdr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 return ret;
236}
237
Patrick McHardyc5c25232007-04-09 11:47:18 -0700238static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239{
240 struct esp_data *esp = x->data;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000241 u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
Patrick McHardyc5c25232007-04-09 11:47:18 -0700242 u32 align = max_t(u32, blksize, esp->conf.padlen);
243 u32 rem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Patrick McHardyc5c25232007-04-09 11:47:18 -0700245 mtu -= x->props.header_len + esp->auth.icv_trunc_len;
246 rem = mtu & (align - 1);
247 mtu &= ~(align - 1);
248
249 if (x->props.mode != XFRM_MODE_TUNNEL) {
Herbert Xud4875b02005-10-10 21:11:34 -0700250 u32 padsize = ((blksize - 1) & 7) + 1;
Patrick McHardyc5c25232007-04-09 11:47:18 -0700251 mtu -= blksize - padsize;
252 mtu += min_t(u32, blksize - padsize, rem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Patrick McHardyc5c25232007-04-09 11:47:18 -0700255 return mtu - 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256}
257
258static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900259 int type, int code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
261 struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
262 struct ipv6_esp_hdr *esph = (struct ipv6_esp_hdr*)(skb->data+offset);
263 struct xfrm_state *x;
264
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900265 if (type != ICMPV6_DEST_UNREACH &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 type != ICMPV6_PKT_TOOBIG)
267 return;
268
269 x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6);
270 if (!x)
271 return;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900272 printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 ntohl(esph->spi), NIP6(iph->daddr));
274 xfrm_state_put(x);
275}
276
277static void esp6_destroy(struct xfrm_state *x)
278{
279 struct esp_data *esp = x->data;
280
281 if (!esp)
282 return;
283
Herbert Xu6b7326c2006-07-30 15:41:01 +1000284 crypto_free_blkcipher(esp->conf.tfm);
Jesper Juhl573dbd92005-09-01 17:44:29 -0700285 esp->conf.tfm = NULL;
286 kfree(esp->conf.ivec);
287 esp->conf.ivec = NULL;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000288 crypto_free_hash(esp->auth.tfm);
Jesper Juhl573dbd92005-09-01 17:44:29 -0700289 esp->auth.tfm = NULL;
290 kfree(esp->auth.work_icv);
291 esp->auth.work_icv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 kfree(esp);
293}
294
Herbert Xu72cb6962005-06-20 13:18:08 -0700295static int esp6_init_state(struct xfrm_state *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
297 struct esp_data *esp = NULL;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000298 struct crypto_blkcipher *tfm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 if (x->ealg == NULL)
301 goto error;
302
303 if (x->encap)
304 goto error;
305
Ingo Oeser0c600ed2006-03-20 23:01:32 -0800306 esp = kzalloc(sizeof(*esp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 if (esp == NULL)
308 return -ENOMEM;
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 if (x->aalg) {
311 struct xfrm_algo_desc *aalg_desc;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000312 struct crypto_hash *hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Herbert Xu07d4ee52006-08-20 14:24:50 +1000314 hash = crypto_alloc_hash(x->aalg->alg_name, 0,
315 CRYPTO_ALG_ASYNC);
316 if (IS_ERR(hash))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 goto error;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000318
319 esp->auth.tfm = hash;
Herbert Xu4b7137f2007-10-08 17:13:44 -0700320 if (crypto_hash_setkey(hash, x->aalg->alg_key,
321 (x->aalg->alg_key_len + 7) / 8))
Herbert Xu07d4ee52006-08-20 14:24:50 +1000322 goto error;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
325 BUG_ON(!aalg_desc);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
Herbert Xu07d4ee52006-08-20 14:24:50 +1000328 crypto_hash_digestsize(hash)) {
329 NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n",
330 x->aalg->alg_name,
331 crypto_hash_digestsize(hash),
332 aalg_desc->uinfo.auth.icv_fullbits/8);
333 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
337 esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL);
340 if (!esp->auth.work_icv)
341 goto error;
342 }
Herbert Xu6b7326c2006-07-30 15:41:01 +1000343 tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC);
344 if (IS_ERR(tfm))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 goto error;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000346 esp->conf.tfm = tfm;
347 esp->conf.ivlen = crypto_blkcipher_ivsize(tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 esp->conf.padlen = 0;
349 if (esp->conf.ivlen) {
350 esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL);
351 if (unlikely(esp->conf.ivec == NULL))
352 goto error;
David S. Millere4bec822006-09-22 15:17:35 -0700353 esp->conf.ivinitted = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 }
Herbert Xu4b7137f2007-10-08 17:13:44 -0700355 if (crypto_blkcipher_setkey(tfm, x->ealg->alg_key,
356 (x->ealg->alg_key_len + 7) / 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 goto error;
358 x->props.header_len = sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen;
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700359 if (x->props.mode == XFRM_MODE_TUNNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 x->props.header_len += sizeof(struct ipv6hdr);
361 x->data = esp;
362 return 0;
363
364error:
365 x->data = esp;
366 esp6_destroy(x);
367 x->data = NULL;
368 return -EINVAL;
369}
370
371static struct xfrm_type esp6_type =
372{
373 .description = "ESP6",
374 .owner = THIS_MODULE,
375 .proto = IPPROTO_ESP,
Herbert Xu436a0a42007-10-08 17:25:53 -0700376 .flags = XFRM_TYPE_REPLAY_PROT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 .init_state = esp6_init_state,
378 .destructor = esp6_destroy,
Patrick McHardyc5c25232007-04-09 11:47:18 -0700379 .get_mtu = esp6_get_mtu,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 .input = esp6_input,
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700381 .output = esp6_output,
382 .hdr_offset = xfrm6_find_1stfragopt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383};
384
385static struct inet6_protocol esp6_protocol = {
386 .handler = xfrm6_rcv,
387 .err_handler = esp6_err,
388 .flags = INET6_PROTO_NOPOLICY,
389};
390
391static int __init esp6_init(void)
392{
393 if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
394 printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n");
395 return -EAGAIN;
396 }
397 if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) {
398 printk(KERN_INFO "ipv6 esp init: can't add protocol\n");
399 xfrm_unregister_type(&esp6_type, AF_INET6);
400 return -EAGAIN;
401 }
402
403 return 0;
404}
405
406static void __exit esp6_fini(void)
407{
408 if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0)
409 printk(KERN_INFO "ipv6 esp close: can't remove protocol\n");
410 if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
411 printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n");
412}
413
414module_init(esp6_init);
415module_exit(esp6_fini);
416
417MODULE_LICENSE("GPL");
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -0700418MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);