Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C)2002 USAGI/WIDE Project | |
1ab1457c | 3 | * |
1da177e4 LT |
4 | * 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. | |
1ab1457c | 8 | * |
1da177e4 LT |
9 | * 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. | |
1ab1457c | 13 | * |
1da177e4 LT |
14 | * 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 | * | |
1ab1457c | 20 | * Mitsuru KANDA @USAGI : IPv6 Support |
1da177e4 LT |
21 | * Kazunori MIYAZAWA @USAGI : |
22 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
1ab1457c | 23 | * |
1da177e4 LT |
24 | * This file is derived from net/ipv4/esp.c |
25 | */ | |
26 | ||
38320c70 HX |
27 | #include <crypto/aead.h> |
28 | #include <crypto/authenc.h> | |
6b7326c8 | 29 | #include <linux/err.h> |
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <net/ip.h> | |
32 | #include <net/xfrm.h> | |
33 | #include <net/esp.h> | |
72998d8c | 34 | #include <linux/scatterlist.h> |
a02a6422 | 35 | #include <linux/kernel.h> |
1da177e4 LT |
36 | #include <linux/pfkeyv2.h> |
37 | #include <linux/random.h> | |
38320c70 | 38 | #include <linux/slab.h> |
b7c6538c | 39 | #include <linux/spinlock.h> |
1da177e4 LT |
40 | #include <net/icmp.h> |
41 | #include <net/ipv6.h> | |
14c85021 | 42 | #include <net/protocol.h> |
1da177e4 LT |
43 | #include <linux/icmpv6.h> |
44 | ||
38320c70 HX |
45 | struct esp_skb_cb { |
46 | struct xfrm_skb_cb xfrm; | |
47 | void *tmp; | |
48 | }; | |
49 | ||
50 | #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0])) | |
51 | ||
52 | /* | |
53 | * Allocate an AEAD request structure with extra space for SG and IV. | |
54 | * | |
55 | * For alignment considerations the IV is placed at the front, followed | |
56 | * by the request and finally the SG list. | |
57 | * | |
58 | * TODO: Use spare space in skb for this where possible. | |
59 | */ | |
60 | static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags) | |
61 | { | |
62 | unsigned int len; | |
63 | ||
64 | len = crypto_aead_ivsize(aead); | |
65 | if (len) { | |
66 | len += crypto_aead_alignmask(aead) & | |
67 | ~(crypto_tfm_ctx_alignment() - 1); | |
68 | len = ALIGN(len, crypto_tfm_ctx_alignment()); | |
69 | } | |
70 | ||
71 | len += sizeof(struct aead_givcrypt_request) + crypto_aead_reqsize(aead); | |
72 | len = ALIGN(len, __alignof__(struct scatterlist)); | |
73 | ||
74 | len += sizeof(struct scatterlist) * nfrags; | |
75 | ||
76 | return kmalloc(len, GFP_ATOMIC); | |
77 | } | |
78 | ||
79 | static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp) | |
80 | { | |
81 | return crypto_aead_ivsize(aead) ? | |
82 | PTR_ALIGN((u8 *)tmp, crypto_aead_alignmask(aead) + 1) : tmp; | |
83 | } | |
84 | ||
85 | static inline struct aead_givcrypt_request *esp_tmp_givreq( | |
86 | struct crypto_aead *aead, u8 *iv) | |
87 | { | |
88 | struct aead_givcrypt_request *req; | |
89 | ||
90 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
91 | crypto_tfm_ctx_alignment()); | |
92 | aead_givcrypt_set_tfm(req, aead); | |
93 | return req; | |
94 | } | |
95 | ||
96 | static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv) | |
97 | { | |
98 | struct aead_request *req; | |
99 | ||
100 | req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead), | |
101 | crypto_tfm_ctx_alignment()); | |
102 | aead_request_set_tfm(req, aead); | |
103 | return req; | |
104 | } | |
105 | ||
106 | static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead, | |
107 | struct aead_request *req) | |
108 | { | |
109 | return (void *)ALIGN((unsigned long)(req + 1) + | |
110 | crypto_aead_reqsize(aead), | |
111 | __alignof__(struct scatterlist)); | |
112 | } | |
113 | ||
114 | static inline struct scatterlist *esp_givreq_sg( | |
115 | struct crypto_aead *aead, struct aead_givcrypt_request *req) | |
116 | { | |
117 | return (void *)ALIGN((unsigned long)(req + 1) + | |
118 | crypto_aead_reqsize(aead), | |
119 | __alignof__(struct scatterlist)); | |
120 | } | |
121 | ||
122 | static void esp_output_done(struct crypto_async_request *base, int err) | |
123 | { | |
124 | struct sk_buff *skb = base->data; | |
125 | ||
126 | kfree(ESP_SKB_CB(skb)->tmp); | |
127 | xfrm_output_resume(skb, err); | |
128 | } | |
129 | ||
1da177e4 LT |
130 | static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) |
131 | { | |
132 | int err; | |
87bdc48d | 133 | struct ip_esp_hdr *esph; |
38320c70 HX |
134 | struct crypto_aead *aead; |
135 | struct aead_givcrypt_request *req; | |
136 | struct scatterlist *sg; | |
137 | struct scatterlist *asg; | |
1da177e4 | 138 | struct sk_buff *trailer; |
38320c70 | 139 | void *tmp; |
1da177e4 LT |
140 | int blksize; |
141 | int clen; | |
142 | int alen; | |
143 | int nfrags; | |
38320c70 | 144 | u8 *iv; |
27a884dc | 145 | u8 *tail; |
ea2ae17d | 146 | struct esp_data *esp = x->data; |
1da177e4 | 147 | |
7b277b1a | 148 | /* skb is pure payload to encrypt */ |
1da177e4 LT |
149 | err = -ENOMEM; |
150 | ||
151 | /* Round to block size */ | |
152 | clen = skb->len; | |
153 | ||
38320c70 HX |
154 | aead = esp->aead; |
155 | alen = crypto_aead_authsize(aead); | |
156 | ||
157 | blksize = ALIGN(crypto_aead_blocksize(aead), 4); | |
a02a6422 | 158 | clen = ALIGN(clen + 2, blksize); |
38320c70 HX |
159 | if (esp->padlen) |
160 | clen = ALIGN(clen, esp->padlen); | |
1da177e4 | 161 | |
38320c70 | 162 | if ((err = skb_cow_data(skb, clen - skb->len + alen, &trailer)) < 0) |
1da177e4 | 163 | goto error; |
38320c70 HX |
164 | nfrags = err; |
165 | ||
166 | tmp = esp_alloc_tmp(aead, nfrags + 1); | |
167 | if (!tmp) | |
168 | goto error; | |
169 | ||
170 | iv = esp_tmp_iv(aead, tmp); | |
171 | req = esp_tmp_givreq(aead, iv); | |
172 | asg = esp_givreq_sg(aead, req); | |
173 | sg = asg + 1; | |
1da177e4 LT |
174 | |
175 | /* Fill padding... */ | |
27a884dc | 176 | tail = skb_tail_pointer(trailer); |
1da177e4 LT |
177 | do { |
178 | int i; | |
179 | for (i=0; i<clen-skb->len - 2; i++) | |
27a884dc | 180 | tail[i] = i + 1; |
1da177e4 | 181 | } while (0); |
27a884dc | 182 | tail[clen-skb->len - 2] = (clen - skb->len) - 2; |
38320c70 HX |
183 | tail[clen - skb->len - 1] = *skb_mac_header(skb); |
184 | pskb_put(skb, trailer, clen - skb->len + alen); | |
1da177e4 | 185 | |
7b277b1a | 186 | skb_push(skb, -skb_network_offset(skb)); |
87bdc48d | 187 | esph = ip_esp_hdr(skb); |
007f0211 | 188 | *skb_mac_header(skb) = IPPROTO_ESP; |
1da177e4 LT |
189 | |
190 | esph->spi = x->id.spi; | |
b318e0e4 | 191 | esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output); |
1da177e4 | 192 | |
38320c70 HX |
193 | sg_init_table(sg, nfrags); |
194 | skb_to_sgvec(skb, sg, | |
195 | esph->enc_data + crypto_aead_ivsize(aead) - skb->data, | |
196 | clen + alen); | |
197 | sg_init_one(asg, esph, sizeof(*esph)); | |
b7c6538c | 198 | |
38320c70 HX |
199 | aead_givcrypt_set_callback(req, 0, esp_output_done, skb); |
200 | aead_givcrypt_set_crypt(req, sg, sg, clen, iv); | |
201 | aead_givcrypt_set_assoc(req, asg, sizeof(*esph)); | |
b318e0e4 HX |
202 | aead_givcrypt_set_giv(req, esph->enc_data, |
203 | XFRM_SKB_CB(skb)->seq.output); | |
1da177e4 | 204 | |
38320c70 HX |
205 | ESP_SKB_CB(skb)->tmp = tmp; |
206 | err = crypto_aead_givencrypt(req); | |
207 | if (err == -EINPROGRESS) | |
208 | goto error; | |
1da177e4 | 209 | |
38320c70 HX |
210 | if (err == -EBUSY) |
211 | err = NET_XMIT_DROP; | |
212 | ||
213 | kfree(tmp); | |
214 | ||
215 | error: | |
216 | return err; | |
217 | } | |
218 | ||
219 | static int esp_input_done2(struct sk_buff *skb, int err) | |
220 | { | |
221 | struct xfrm_state *x = xfrm_input_state(skb); | |
222 | struct esp_data *esp = x->data; | |
223 | struct crypto_aead *aead = esp->aead; | |
224 | int alen = crypto_aead_authsize(aead); | |
225 | int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); | |
226 | int elen = skb->len - hlen; | |
227 | int hdr_len = skb_network_header_len(skb); | |
228 | int padlen; | |
229 | u8 nexthdr[2]; | |
230 | ||
231 | kfree(ESP_SKB_CB(skb)->tmp); | |
1da177e4 | 232 | |
6b7326c8 | 233 | if (unlikely(err)) |
38320c70 | 234 | goto out; |
6b7326c8 | 235 | |
38320c70 HX |
236 | if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2)) |
237 | BUG(); | |
1da177e4 | 238 | |
38320c70 HX |
239 | err = -EINVAL; |
240 | padlen = nexthdr[0]; | |
241 | if (padlen + 2 + alen >= elen) { | |
242 | LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage " | |
243 | "padlen=%d, elen=%d\n", padlen + 2, elen - alen); | |
244 | goto out; | |
1da177e4 LT |
245 | } |
246 | ||
38320c70 | 247 | /* ... check padding bits here. Silly. :-) */ |
b7c6538c | 248 | |
38320c70 HX |
249 | pskb_trim(skb, skb->len - alen - padlen - 2); |
250 | __skb_pull(skb, hlen); | |
251 | skb_set_transport_header(skb, -hdr_len); | |
252 | ||
253 | err = nexthdr[1]; | |
254 | ||
255 | /* RFC4303: Drop dummy packets without any error */ | |
256 | if (err == IPPROTO_NONE) | |
257 | err = -EINVAL; | |
258 | ||
259 | out: | |
1da177e4 LT |
260 | return err; |
261 | } | |
262 | ||
38320c70 HX |
263 | static void esp_input_done(struct crypto_async_request *base, int err) |
264 | { | |
265 | struct sk_buff *skb = base->data; | |
266 | ||
267 | xfrm_input_resume(skb, esp_input_done2(skb, err)); | |
268 | } | |
269 | ||
e695633e | 270 | static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 | 271 | { |
87bdc48d | 272 | struct ip_esp_hdr *esph; |
1da177e4 | 273 | struct esp_data *esp = x->data; |
38320c70 HX |
274 | struct crypto_aead *aead = esp->aead; |
275 | struct aead_request *req; | |
1da177e4 | 276 | struct sk_buff *trailer; |
38320c70 | 277 | int elen = skb->len - sizeof(*esph) - crypto_aead_ivsize(aead); |
1da177e4 | 278 | int nfrags; |
1da177e4 | 279 | int ret = 0; |
38320c70 HX |
280 | void *tmp; |
281 | u8 *iv; | |
282 | struct scatterlist *sg; | |
283 | struct scatterlist *asg; | |
1da177e4 | 284 | |
920fc941 | 285 | if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) { |
1da177e4 | 286 | ret = -EINVAL; |
31a4ab93 | 287 | goto out; |
1da177e4 LT |
288 | } |
289 | ||
38320c70 | 290 | if (elen <= 0) { |
1da177e4 | 291 | ret = -EINVAL; |
31a4ab93 | 292 | goto out; |
1da177e4 | 293 | } |
1da177e4 | 294 | |
0ebea8ef HX |
295 | if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) { |
296 | ret = -EINVAL; | |
297 | goto out; | |
298 | } | |
299 | ||
38320c70 HX |
300 | ret = -ENOMEM; |
301 | tmp = esp_alloc_tmp(aead, nfrags + 1); | |
302 | if (!tmp) | |
303 | goto out; | |
1da177e4 | 304 | |
38320c70 HX |
305 | ESP_SKB_CB(skb)->tmp = tmp; |
306 | iv = esp_tmp_iv(aead, tmp); | |
307 | req = esp_tmp_req(aead, iv); | |
308 | asg = esp_req_sg(aead, req); | |
309 | sg = asg + 1; | |
1da177e4 | 310 | |
38320c70 | 311 | skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 312 | |
87bdc48d | 313 | esph = (struct ip_esp_hdr *)skb->data; |
1da177e4 LT |
314 | |
315 | /* Get ivec. This can be wrong, check against another impls. */ | |
38320c70 | 316 | iv = esph->enc_data; |
0ebea8ef | 317 | |
38320c70 HX |
318 | sg_init_table(sg, nfrags); |
319 | skb_to_sgvec(skb, sg, sizeof(*esph) + crypto_aead_ivsize(aead), elen); | |
320 | sg_init_one(asg, esph, sizeof(*esph)); | |
0ebea8ef | 321 | |
38320c70 HX |
322 | aead_request_set_callback(req, 0, esp_input_done, skb); |
323 | aead_request_set_crypt(req, sg, sg, elen, iv); | |
324 | aead_request_set_assoc(req, asg, sizeof(*esph)); | |
1da177e4 | 325 | |
38320c70 HX |
326 | ret = crypto_aead_decrypt(req); |
327 | if (ret == -EINPROGRESS) | |
328 | goto out; | |
95a02cfd | 329 | |
38320c70 | 330 | ret = esp_input_done2(skb, ret); |
1da177e4 LT |
331 | |
332 | out: | |
1da177e4 LT |
333 | return ret; |
334 | } | |
335 | ||
c5c25238 | 336 | static u32 esp6_get_mtu(struct xfrm_state *x, int mtu) |
1da177e4 LT |
337 | { |
338 | struct esp_data *esp = x->data; | |
38320c70 HX |
339 | u32 blksize = ALIGN(crypto_aead_blocksize(esp->aead), 4); |
340 | u32 align = max_t(u32, blksize, esp->padlen); | |
c5c25238 | 341 | u32 rem; |
1da177e4 | 342 | |
38320c70 | 343 | mtu -= x->props.header_len + crypto_aead_authsize(esp->aead); |
c5c25238 PM |
344 | rem = mtu & (align - 1); |
345 | mtu &= ~(align - 1); | |
346 | ||
347 | if (x->props.mode != XFRM_MODE_TUNNEL) { | |
d4875b04 | 348 | u32 padsize = ((blksize - 1) & 7) + 1; |
c5c25238 PM |
349 | mtu -= blksize - padsize; |
350 | mtu += min_t(u32, blksize - padsize, rem); | |
1da177e4 | 351 | } |
1da177e4 | 352 | |
c5c25238 | 353 | return mtu - 2; |
1da177e4 LT |
354 | } |
355 | ||
356 | static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 357 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 358 | { |
4fb236ba | 359 | struct net *net = dev_net(skb->dev); |
1da177e4 | 360 | struct ipv6hdr *iph = (struct ipv6hdr*)skb->data; |
87bdc48d | 361 | struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data + offset); |
1da177e4 LT |
362 | struct xfrm_state *x; |
363 | ||
1ab1457c | 364 | if (type != ICMPV6_DEST_UNREACH && |
1da177e4 LT |
365 | type != ICMPV6_PKT_TOOBIG) |
366 | return; | |
367 | ||
4fb236ba | 368 | x = xfrm_state_lookup(net, (xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6); |
1da177e4 LT |
369 | if (!x) |
370 | return; | |
5b095d98 | 371 | printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/%pI6\n", |
0c6ce78a | 372 | ntohl(esph->spi), &iph->daddr); |
1da177e4 LT |
373 | xfrm_state_put(x); |
374 | } | |
375 | ||
376 | static void esp6_destroy(struct xfrm_state *x) | |
377 | { | |
378 | struct esp_data *esp = x->data; | |
379 | ||
380 | if (!esp) | |
381 | return; | |
382 | ||
38320c70 | 383 | crypto_free_aead(esp->aead); |
1da177e4 LT |
384 | kfree(esp); |
385 | } | |
386 | ||
1a6509d9 HX |
387 | static int esp_init_aead(struct xfrm_state *x) |
388 | { | |
389 | struct esp_data *esp = x->data; | |
390 | struct crypto_aead *aead; | |
391 | int err; | |
392 | ||
393 | aead = crypto_alloc_aead(x->aead->alg_name, 0, 0); | |
394 | err = PTR_ERR(aead); | |
395 | if (IS_ERR(aead)) | |
396 | goto error; | |
397 | ||
398 | esp->aead = aead; | |
399 | ||
400 | err = crypto_aead_setkey(aead, x->aead->alg_key, | |
401 | (x->aead->alg_key_len + 7) / 8); | |
402 | if (err) | |
403 | goto error; | |
404 | ||
405 | err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8); | |
406 | if (err) | |
407 | goto error; | |
408 | ||
409 | error: | |
410 | return err; | |
411 | } | |
412 | ||
413 | static int esp_init_authenc(struct xfrm_state *x) | |
1da177e4 | 414 | { |
1a6509d9 | 415 | struct esp_data *esp = x->data; |
38320c70 HX |
416 | struct crypto_aead *aead; |
417 | struct crypto_authenc_key_param *param; | |
418 | struct rtattr *rta; | |
419 | char *key; | |
420 | char *p; | |
421 | char authenc_name[CRYPTO_MAX_ALG_NAME]; | |
38320c70 HX |
422 | unsigned int keylen; |
423 | int err; | |
1da177e4 | 424 | |
1a6509d9 | 425 | err = -EINVAL; |
1da177e4 | 426 | if (x->ealg == NULL) |
1a6509d9 | 427 | goto error; |
38320c70 | 428 | |
1a6509d9 | 429 | err = -ENAMETOOLONG; |
38320c70 HX |
430 | if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME, "authenc(%s,%s)", |
431 | x->aalg ? x->aalg->alg_name : "digest_null", | |
432 | x->ealg->alg_name) >= CRYPTO_MAX_ALG_NAME) | |
1a6509d9 | 433 | goto error; |
38320c70 HX |
434 | |
435 | aead = crypto_alloc_aead(authenc_name, 0, 0); | |
436 | err = PTR_ERR(aead); | |
437 | if (IS_ERR(aead)) | |
438 | goto error; | |
439 | ||
440 | esp->aead = aead; | |
441 | ||
442 | keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) + | |
443 | (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param)); | |
444 | err = -ENOMEM; | |
445 | key = kmalloc(keylen, GFP_KERNEL); | |
446 | if (!key) | |
447 | goto error; | |
448 | ||
449 | p = key; | |
450 | rta = (void *)p; | |
451 | rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM; | |
452 | rta->rta_len = RTA_LENGTH(sizeof(*param)); | |
453 | param = RTA_DATA(rta); | |
454 | p += RTA_SPACE(sizeof(*param)); | |
455 | ||
1da177e4 LT |
456 | if (x->aalg) { |
457 | struct xfrm_algo_desc *aalg_desc; | |
458 | ||
38320c70 HX |
459 | memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8); |
460 | p += (x->aalg->alg_key_len + 7) / 8; | |
1ab1457c | 461 | |
1da177e4 LT |
462 | aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0); |
463 | BUG_ON(!aalg_desc); | |
1ab1457c | 464 | |
38320c70 | 465 | err = -EINVAL; |
1da177e4 | 466 | if (aalg_desc->uinfo.auth.icv_fullbits/8 != |
38320c70 | 467 | crypto_aead_authsize(aead)) { |
07d4ee58 HX |
468 | NETDEBUG(KERN_INFO "ESP: %s digestsize %u != %hu\n", |
469 | x->aalg->alg_name, | |
38320c70 | 470 | crypto_aead_authsize(aead), |
07d4ee58 | 471 | aalg_desc->uinfo.auth.icv_fullbits/8); |
38320c70 | 472 | goto free_key; |
1da177e4 | 473 | } |
1ab1457c | 474 | |
38320c70 HX |
475 | err = crypto_aead_setauthsize( |
476 | aead, aalg_desc->uinfo.auth.icv_truncbits / 8); | |
477 | if (err) | |
478 | goto free_key; | |
1da177e4 | 479 | } |
38320c70 | 480 | |
38320c70 HX |
481 | param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8); |
482 | memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8); | |
483 | ||
484 | err = crypto_aead_setkey(aead, key, keylen); | |
485 | ||
486 | free_key: | |
487 | kfree(key); | |
488 | ||
1a6509d9 HX |
489 | error: |
490 | return err; | |
491 | } | |
492 | ||
493 | static int esp6_init_state(struct xfrm_state *x) | |
494 | { | |
495 | struct esp_data *esp; | |
496 | struct crypto_aead *aead; | |
497 | u32 align; | |
498 | int err; | |
499 | ||
500 | if (x->encap) | |
501 | return -EINVAL; | |
502 | ||
503 | esp = kzalloc(sizeof(*esp), GFP_KERNEL); | |
504 | if (esp == NULL) | |
505 | return -ENOMEM; | |
506 | ||
507 | x->data = esp; | |
508 | ||
509 | if (x->aead) | |
510 | err = esp_init_aead(x); | |
511 | else | |
512 | err = esp_init_authenc(x); | |
513 | ||
38320c70 | 514 | if (err) |
1da177e4 | 515 | goto error; |
38320c70 | 516 | |
1a6509d9 HX |
517 | aead = esp->aead; |
518 | ||
519 | esp->padlen = 0; | |
520 | ||
38320c70 HX |
521 | x->props.header_len = sizeof(struct ip_esp_hdr) + |
522 | crypto_aead_ivsize(aead); | |
ca68145f HX |
523 | switch (x->props.mode) { |
524 | case XFRM_MODE_BEET: | |
abf5cdb8 JK |
525 | if (x->sel.family != AF_INET6) |
526 | x->props.header_len += IPV4_BEET_PHMAXLEN + | |
527 | (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); | |
528 | break; | |
ca68145f HX |
529 | case XFRM_MODE_TRANSPORT: |
530 | break; | |
531 | case XFRM_MODE_TUNNEL: | |
1da177e4 | 532 | x->props.header_len += sizeof(struct ipv6hdr); |
ea2c47b4 | 533 | break; |
ca68145f HX |
534 | default: |
535 | goto error; | |
536 | } | |
38320c70 HX |
537 | |
538 | align = ALIGN(crypto_aead_blocksize(aead), 4); | |
539 | if (esp->padlen) | |
540 | align = max_t(u32, align, esp->padlen); | |
541 | x->props.trailer_len = align + 1 + crypto_aead_authsize(esp->aead); | |
1da177e4 LT |
542 | |
543 | error: | |
38320c70 | 544 | return err; |
1da177e4 LT |
545 | } |
546 | ||
533cb5b0 | 547 | static const struct xfrm_type esp6_type = |
1da177e4 LT |
548 | { |
549 | .description = "ESP6", | |
550 | .owner = THIS_MODULE, | |
551 | .proto = IPPROTO_ESP, | |
436a0a40 | 552 | .flags = XFRM_TYPE_REPLAY_PROT, |
1da177e4 LT |
553 | .init_state = esp6_init_state, |
554 | .destructor = esp6_destroy, | |
c5c25238 | 555 | .get_mtu = esp6_get_mtu, |
1da177e4 | 556 | .input = esp6_input, |
aee5adb4 MN |
557 | .output = esp6_output, |
558 | .hdr_offset = xfrm6_find_1stfragopt, | |
1da177e4 LT |
559 | }; |
560 | ||
561 | static struct inet6_protocol esp6_protocol = { | |
562 | .handler = xfrm6_rcv, | |
563 | .err_handler = esp6_err, | |
564 | .flags = INET6_PROTO_NOPOLICY, | |
565 | }; | |
566 | ||
567 | static int __init esp6_init(void) | |
568 | { | |
569 | if (xfrm_register_type(&esp6_type, AF_INET6) < 0) { | |
570 | printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n"); | |
571 | return -EAGAIN; | |
572 | } | |
573 | if (inet6_add_protocol(&esp6_protocol, IPPROTO_ESP) < 0) { | |
574 | printk(KERN_INFO "ipv6 esp init: can't add protocol\n"); | |
575 | xfrm_unregister_type(&esp6_type, AF_INET6); | |
576 | return -EAGAIN; | |
577 | } | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | static void __exit esp6_fini(void) | |
583 | { | |
584 | if (inet6_del_protocol(&esp6_protocol, IPPROTO_ESP) < 0) | |
585 | printk(KERN_INFO "ipv6 esp close: can't remove protocol\n"); | |
586 | if (xfrm_unregister_type(&esp6_type, AF_INET6) < 0) | |
587 | printk(KERN_INFO "ipv6 esp close: can't remove xfrm type\n"); | |
588 | } | |
589 | ||
590 | module_init(esp6_init); | |
591 | module_exit(esp6_fini); | |
592 | ||
593 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 594 | MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_ESP); |