blob: b0715432e454e4360a0e3e55fbded272a048b235 [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>
Herbert Xub7c65382007-10-09 13:33:35 -070037#include <linux/spinlock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <net/icmp.h>
39#include <net/ipv6.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020040#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/icmpv6.h>
42
43static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
44{
45 int err;
Herbert Xu87bdc482007-10-10 15:45:25 -070046 struct ip_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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Herbert Xu7b277b12007-10-10 15:44:06 -070057 /* skb is pure payload to encrypt */
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 err = -ENOMEM;
59
60 /* Round to block size */
61 clen = skb->len;
62
63 alen = esp->auth.icv_trunc_len;
64 tfm = esp->conf.tfm;
Herbert Xu6b7326c2006-07-30 15:41:01 +100065 desc.tfm = tfm;
66 desc.flags = 0;
67 blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
Herbert Xua02a6422005-10-10 21:11:08 -070068 clen = ALIGN(clen + 2, blksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 if (esp->conf.padlen)
Herbert Xua02a6422005-10-10 21:11:08 -070070 clen = ALIGN(clen, esp->conf.padlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72 if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) {
73 goto error;
74 }
75
76 /* Fill padding... */
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -070077 tail = skb_tail_pointer(trailer);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 do {
79 int i;
80 for (i=0; i<clen-skb->len - 2; i++)
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -070081 tail[i] = i + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 } while (0);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -070083 tail[clen-skb->len - 2] = (clen - skb->len) - 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 pskb_put(skb, trailer, clen - skb->len);
85
Herbert Xu7b277b12007-10-10 15:44:06 -070086 skb_push(skb, -skb_network_offset(skb));
Herbert Xu87bdc482007-10-10 15:45:25 -070087 esph = ip_esp_hdr(skb);
Herbert Xu007f0212007-10-09 13:25:59 -070088 *(skb_tail_pointer(trailer) - 1) = *skb_mac_header(skb);
89 *skb_mac_header(skb) = IPPROTO_ESP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 esph->spi = x->id.spi;
Herbert Xu436a0a42007-10-08 17:25:53 -070092 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Herbert Xub7c65382007-10-09 13:33:35 -070094 spin_lock_bh(&x->lock);
95
David S. Millere4bec822006-09-22 15:17:35 -070096 if (esp->conf.ivlen) {
97 if (unlikely(!esp->conf.ivinitted)) {
98 get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
99 esp->conf.ivinitted = 1;
100 }
Herbert Xu6b7326c2006-07-30 15:41:01 +1000101 crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
David S. Millere4bec822006-09-22 15:17:35 -0700102 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104 do {
105 struct scatterlist *sg = &esp->sgbuf[0];
106
107 if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
108 sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
109 if (!sg)
Herbert Xub7c65382007-10-09 13:33:35 -0700110 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 }
112 skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
Herbert Xu6b7326c2006-07-30 15:41:01 +1000113 err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 if (unlikely(sg != &esp->sgbuf[0]))
115 kfree(sg);
116 } while (0);
117
Herbert Xu6b7326c2006-07-30 15:41:01 +1000118 if (unlikely(err))
Herbert Xub7c65382007-10-09 13:33:35 -0700119 goto unlock;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (esp->conf.ivlen) {
Herbert Xu6b7326c2006-07-30 15:41:01 +1000122 memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
123 crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 }
125
126 if (esp->auth.icv_full_len) {
Herbert Xu07d4ee52006-08-20 14:24:50 +1000127 err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data,
128 sizeof(*esph) + esp->conf.ivlen + clen);
129 memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 }
131
Herbert Xub7c65382007-10-09 13:33:35 -0700132unlock:
133 spin_unlock_bh(&x->lock);
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135error:
136 return err;
137}
138
Herbert Xue6956332006-04-01 00:52:46 -0800139static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140{
141 struct ipv6hdr *iph;
Herbert Xu87bdc482007-10-10 15:45:25 -0700142 struct ip_esp_hdr *esph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 struct esp_data *esp = x->data;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000144 struct crypto_blkcipher *tfm = esp->conf.tfm;
145 struct blkcipher_desc desc = { .tfm = tfm };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 struct sk_buff *trailer;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000147 int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 int alen = esp->auth.icv_trunc_len;
Herbert Xu87bdc482007-10-10 15:45:25 -0700149 int elen = skb->len - sizeof(*esph) - esp->conf.ivlen - alen;
Arnaldo Carvalho de Melocfe1fc72007-03-16 17:26:39 -0300150 int hdr_len = skb_network_header_len(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 int nfrags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 int ret = 0;
153
Herbert Xu87bdc482007-10-10 15:45:25 -0700154 if (!pskb_may_pull(skb, sizeof(*esph))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 ret = -EINVAL;
Herbert Xu31a4ab92006-05-27 23:06:13 -0700156 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
158
159 if (elen <= 0 || (elen & (blksize-1))) {
160 ret = -EINVAL;
Herbert Xu31a4ab92006-05-27 23:06:13 -0700161 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 /* If integrity check is required, do this. */
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900165 if (esp->auth.icv_full_len) {
Herbert Xu07d4ee52006-08-20 14:24:50 +1000166 u8 sum[alen];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Herbert Xu07d4ee52006-08-20 14:24:50 +1000168 ret = esp_mac_digest(esp, skb, 0, skb->len - alen);
169 if (ret)
170 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Herbert Xu07d4ee52006-08-20 14:24:50 +1000172 if (skb_copy_bits(skb, skb->len - alen, sum, alen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 BUG();
174
Herbert Xu07d4ee52006-08-20 14:24:50 +1000175 if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 x->stats.integrity_failed++;
177 ret = -EINVAL;
178 goto out;
179 }
180 }
181
182 if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) {
183 ret = -EINVAL;
184 goto out;
185 }
186
187 skb->ip_summed = CHECKSUM_NONE;
188
Herbert Xu87bdc482007-10-10 15:45:25 -0700189 esph = (struct ip_esp_hdr *)skb->data;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700190 iph = ipv6_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 /* Get ivec. This can be wrong, check against another impls. */
193 if (esp->conf.ivlen)
Herbert Xu6b7326c2006-07-30 15:41:01 +1000194 crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900196 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 u8 nexthdr[2];
198 struct scatterlist *sg = &esp->sgbuf[0];
199 u8 padlen;
200
201 if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
202 sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
203 if (!sg) {
204 ret = -ENOMEM;
205 goto out;
206 }
207 }
Herbert Xu87bdc482007-10-10 15:45:25 -0700208 skb_to_sgvec(skb, sg, sizeof(*esph) + esp->conf.ivlen, elen);
Herbert Xu6b7326c2006-07-30 15:41:01 +1000209 ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 if (unlikely(sg != &esp->sgbuf[0]))
211 kfree(sg);
Herbert Xu6b7326c2006-07-30 15:41:01 +1000212 if (unlikely(ret))
213 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215 if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
216 BUG();
217
218 padlen = nexthdr[0];
219 if (padlen+2 >= elen) {
Patrick McHardy64ce2072005-08-09 20:50:53 -0700220 LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 ret = -EINVAL;
222 goto out;
223 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900224 /* ... check padding bits here. Silly. :-) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 pskb_trim(skb, skb->len - alen - padlen - 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 ret = nexthdr[1];
228 }
229
Arnaldo Carvalho de Melo967b05f2007-03-13 13:51:52 -0300230 __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen);
231 skb_set_transport_header(skb, -hdr_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return ret;
234}
235
Patrick McHardyc5c25232007-04-09 11:47:18 -0700236static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
238 struct esp_data *esp = x->data;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000239 u32 blksize = ALIGN(crypto_blkcipher_blocksize(esp->conf.tfm), 4);
Patrick McHardyc5c25232007-04-09 11:47:18 -0700240 u32 align = max_t(u32, blksize, esp->conf.padlen);
241 u32 rem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
Patrick McHardyc5c25232007-04-09 11:47:18 -0700243 mtu -= x->props.header_len + esp->auth.icv_trunc_len;
244 rem = mtu & (align - 1);
245 mtu &= ~(align - 1);
246
247 if (x->props.mode != XFRM_MODE_TUNNEL) {
Herbert Xud4875b02005-10-10 21:11:34 -0700248 u32 padsize = ((blksize - 1) & 7) + 1;
Patrick McHardyc5c25232007-04-09 11:47:18 -0700249 mtu -= blksize - padsize;
250 mtu += min_t(u32, blksize - padsize, rem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Patrick McHardyc5c25232007-04-09 11:47:18 -0700253 return mtu - 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254}
255
256static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900257 int type, int code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258{
259 struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
Herbert Xu87bdc482007-10-10 15:45:25 -0700260 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 struct xfrm_state *x;
262
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900263 if (type != ICMPV6_DEST_UNREACH &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 type != ICMPV6_PKT_TOOBIG)
265 return;
266
267 x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6);
268 if (!x)
269 return;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900270 printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 ntohl(esph->spi), NIP6(iph->daddr));
272 xfrm_state_put(x);
273}
274
275static void esp6_destroy(struct xfrm_state *x)
276{
277 struct esp_data *esp = x->data;
278
279 if (!esp)
280 return;
281
Herbert Xu6b7326c2006-07-30 15:41:01 +1000282 crypto_free_blkcipher(esp->conf.tfm);
Jesper Juhl573dbd92005-09-01 17:44:29 -0700283 esp->conf.tfm = NULL;
284 kfree(esp->conf.ivec);
285 esp->conf.ivec = NULL;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000286 crypto_free_hash(esp->auth.tfm);
Jesper Juhl573dbd92005-09-01 17:44:29 -0700287 esp->auth.tfm = NULL;
288 kfree(esp->auth.work_icv);
289 esp->auth.work_icv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 kfree(esp);
291}
292
Herbert Xu72cb6962005-06-20 13:18:08 -0700293static int esp6_init_state(struct xfrm_state *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
295 struct esp_data *esp = NULL;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000296 struct crypto_blkcipher *tfm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 if (x->ealg == NULL)
299 goto error;
300
301 if (x->encap)
302 goto error;
303
Ingo Oeser0c600ed2006-03-20 23:01:32 -0800304 esp = kzalloc(sizeof(*esp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 if (esp == NULL)
306 return -ENOMEM;
307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 if (x->aalg) {
309 struct xfrm_algo_desc *aalg_desc;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000310 struct crypto_hash *hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Herbert Xu07d4ee52006-08-20 14:24:50 +1000312 hash = crypto_alloc_hash(x->aalg->alg_name, 0,
313 CRYPTO_ALG_ASYNC);
314 if (IS_ERR(hash))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 goto error;
Herbert Xu07d4ee52006-08-20 14:24:50 +1000316
317 esp->auth.tfm = hash;
Herbert Xu4b7137f2007-10-08 17:13:44 -0700318 if (crypto_hash_setkey(hash, x->aalg->alg_key,
319 (x->aalg->alg_key_len + 7) / 8))
Herbert Xu07d4ee52006-08-20 14:24:50 +1000320 goto error;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
323 BUG_ON(!aalg_desc);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
Herbert Xu07d4ee52006-08-20 14:24:50 +1000326 crypto_hash_digestsize(hash)) {
327 NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n",
328 x->aalg->alg_name,
329 crypto_hash_digestsize(hash),
330 aalg_desc->uinfo.auth.icv_fullbits/8);
331 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 }
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 esp->auth.icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
335 esp->auth.icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 esp->auth.work_icv = kmalloc(esp->auth.icv_full_len, GFP_KERNEL);
338 if (!esp->auth.work_icv)
339 goto error;
340 }
Herbert Xu6b7326c2006-07-30 15:41:01 +1000341 tfm = crypto_alloc_blkcipher(x->ealg->alg_name, 0, CRYPTO_ALG_ASYNC);
342 if (IS_ERR(tfm))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 goto error;
Herbert Xu6b7326c2006-07-30 15:41:01 +1000344 esp->conf.tfm = tfm;
345 esp->conf.ivlen = crypto_blkcipher_ivsize(tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 esp->conf.padlen = 0;
347 if (esp->conf.ivlen) {
348 esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL);
349 if (unlikely(esp->conf.ivec == NULL))
350 goto error;
David S. Millere4bec822006-09-22 15:17:35 -0700351 esp->conf.ivinitted = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 }
Herbert Xu4b7137f2007-10-08 17:13:44 -0700353 if (crypto_blkcipher_setkey(tfm, x->ealg->alg_key,
354 (x->ealg->alg_key_len + 7) / 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 goto error;
Herbert Xu87bdc482007-10-10 15:45:25 -0700356 x->props.header_len = sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
Herbert Xuca681452007-10-17 21:35:15 -0700357 switch (x->props.mode) {
358 case XFRM_MODE_BEET:
359 case XFRM_MODE_TRANSPORT:
360 break;
361 case XFRM_MODE_TUNNEL:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 x->props.header_len += sizeof(struct ipv6hdr);
Herbert Xuca681452007-10-17 21:35:15 -0700363 default:
364 goto error;
365 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 x->data = esp;
367 return 0;
368
369error:
370 x->data = esp;
371 esp6_destroy(x);
372 x->data = NULL;
373 return -EINVAL;
374}
375
376static struct xfrm_type esp6_type =
377{
378 .description = "ESP6",
379 .owner = THIS_MODULE,
380 .proto = IPPROTO_ESP,
Herbert Xu436a0a42007-10-08 17:25:53 -0700381 .flags = XFRM_TYPE_REPLAY_PROT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 .init_state = esp6_init_state,
383 .destructor = esp6_destroy,
Patrick McHardyc5c25232007-04-09 11:47:18 -0700384 .get_mtu = esp6_get_mtu,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 .input = esp6_input,
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700386 .output = esp6_output,
387 .hdr_offset = xfrm6_find_1stfragopt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388};
389
390static struct inet6_protocol esp6_protocol = {
391 .handler = xfrm6_rcv,
392 .err_handler = esp6_err,
393 .flags = INET6_PROTO_NOPOLICY,
394};
395
396static int __init esp6_init(void)
397{
398 if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
399 printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n");
400 return -EAGAIN;
401 }
402 if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) {
403 printk(KERN_INFO "ipv6 esp init: can't add protocol\n");
404 xfrm_unregister_type(&esp6_type, AF_INET6);
405 return -EAGAIN;
406 }
407
408 return 0;
409}
410
411static void __exit esp6_fini(void)
412{
413 if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0)
414 printk(KERN_INFO "ipv6 esp close: can't remove protocol\n");
415 if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0)
416 printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n");
417}
418
419module_init(esp6_init);
420module_exit(esp6_fini);
421
422MODULE_LICENSE("GPL");
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -0700423MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP);