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YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * xfrm algorithm interface
3 *
4 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09008 * Software Foundation; either version 2 of the License, or (at your option)
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * any later version.
10 */
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/pfkeyv2.h>
15#include <linux/crypto.h>
Heiko Carstensb3b724f2007-10-23 09:28:34 +020016#include <linux/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <net/xfrm.h>
18#if defined(CONFIG_INET_AH) || defined(CONFIG_INET_AH_MODULE) || defined(CONFIG_INET6_AH) || defined(CONFIG_INET6_AH_MODULE)
19#include <net/ah.h>
20#endif
21#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
22#include <net/esp.h>
23#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25/*
26 * Algorithms supported by IPsec. These entries contain properties which
27 * are used in key negotiation and xfrm processing, and are used to verify
28 * that instantiated crypto transforms have correct parameters for IPsec
29 * purposes.
30 */
Herbert Xu1a6509d2008-01-28 19:37:29 -080031static struct xfrm_algo_desc aead_list[] = {
32{
33 .name = "rfc4106(gcm(aes))",
34
35 .uinfo = {
36 .aead = {
37 .icv_truncbits = 64,
38 }
39 },
40
41 .desc = {
42 .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV8,
43 .sadb_alg_ivlen = 8,
44 .sadb_alg_minbits = 128,
45 .sadb_alg_maxbits = 256
46 }
47},
48{
49 .name = "rfc4106(gcm(aes))",
50
51 .uinfo = {
52 .aead = {
53 .icv_truncbits = 96,
54 }
55 },
56
57 .desc = {
58 .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV12,
59 .sadb_alg_ivlen = 8,
60 .sadb_alg_minbits = 128,
61 .sadb_alg_maxbits = 256
62 }
63},
64{
65 .name = "rfc4106(gcm(aes))",
66
67 .uinfo = {
68 .aead = {
69 .icv_truncbits = 128,
70 }
71 },
72
73 .desc = {
74 .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV16,
75 .sadb_alg_ivlen = 8,
76 .sadb_alg_minbits = 128,
77 .sadb_alg_maxbits = 256
78 }
79},
80{
81 .name = "rfc4309(ccm(aes))",
82
83 .uinfo = {
84 .aead = {
85 .icv_truncbits = 64,
86 }
87 },
88
89 .desc = {
90 .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV8,
91 .sadb_alg_ivlen = 8,
92 .sadb_alg_minbits = 128,
93 .sadb_alg_maxbits = 256
94 }
95},
96{
97 .name = "rfc4309(ccm(aes))",
98
99 .uinfo = {
100 .aead = {
101 .icv_truncbits = 96,
102 }
103 },
104
105 .desc = {
106 .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV12,
107 .sadb_alg_ivlen = 8,
108 .sadb_alg_minbits = 128,
109 .sadb_alg_maxbits = 256
110 }
111},
112{
113 .name = "rfc4309(ccm(aes))",
114
115 .uinfo = {
116 .aead = {
117 .icv_truncbits = 128,
118 }
119 },
120
121 .desc = {
122 .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV16,
123 .sadb_alg_ivlen = 8,
124 .sadb_alg_minbits = 128,
125 .sadb_alg_maxbits = 256
126 }
127},
Tobias Brunner73c89c12010-01-17 21:52:11 +1100128{
129 .name = "rfc4543(gcm(aes))",
130
131 .uinfo = {
132 .aead = {
133 .icv_truncbits = 128,
134 }
135 },
136
137 .desc = {
138 .sadb_alg_id = SADB_X_EALG_NULL_AES_GMAC,
139 .sadb_alg_ivlen = 8,
140 .sadb_alg_minbits = 128,
141 .sadb_alg_maxbits = 256
142 }
143},
Herbert Xu1a6509d2008-01-28 19:37:29 -0800144};
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146static struct xfrm_algo_desc aalg_list[] = {
147{
Herbert Xu01a22022008-04-27 00:59:59 -0700148 .name = "digest_null",
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 .uinfo = {
151 .auth = {
152 .icv_truncbits = 0,
153 .icv_fullbits = 0,
154 }
155 },
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 .desc = {
158 .sadb_alg_id = SADB_X_AALG_NULL,
159 .sadb_alg_ivlen = 0,
160 .sadb_alg_minbits = 0,
161 .sadb_alg_maxbits = 0
162 }
163},
164{
Herbert Xu07d4ee52006-08-20 14:24:50 +1000165 .name = "hmac(md5)",
166 .compat = "md5",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168 .uinfo = {
169 .auth = {
170 .icv_truncbits = 96,
171 .icv_fullbits = 128,
172 }
173 },
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 .desc = {
176 .sadb_alg_id = SADB_AALG_MD5HMAC,
177 .sadb_alg_ivlen = 0,
178 .sadb_alg_minbits = 128,
179 .sadb_alg_maxbits = 128
180 }
181},
182{
Herbert Xu07d4ee52006-08-20 14:24:50 +1000183 .name = "hmac(sha1)",
184 .compat = "sha1",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
186 .uinfo = {
187 .auth = {
188 .icv_truncbits = 96,
189 .icv_fullbits = 160,
190 }
191 },
192
193 .desc = {
194 .sadb_alg_id = SADB_AALG_SHA1HMAC,
195 .sadb_alg_ivlen = 0,
196 .sadb_alg_minbits = 160,
197 .sadb_alg_maxbits = 160
198 }
199},
200{
Herbert Xu07d4ee52006-08-20 14:24:50 +1000201 .name = "hmac(sha256)",
202 .compat = "sha256",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 .uinfo = {
205 .auth = {
206 .icv_truncbits = 96,
207 .icv_fullbits = 256,
208 }
209 },
210
211 .desc = {
212 .sadb_alg_id = SADB_X_AALG_SHA2_256HMAC,
213 .sadb_alg_ivlen = 0,
214 .sadb_alg_minbits = 256,
215 .sadb_alg_maxbits = 256
216 }
217},
218{
Martin Willibc74b0c2009-11-25 00:58:39 +0000219 .name = "hmac(sha384)",
220
221 .uinfo = {
222 .auth = {
223 .icv_truncbits = 192,
224 .icv_fullbits = 384,
225 }
226 },
227
228 .desc = {
229 .sadb_alg_id = SADB_X_AALG_SHA2_384HMAC,
230 .sadb_alg_ivlen = 0,
231 .sadb_alg_minbits = 384,
232 .sadb_alg_maxbits = 384
233 }
234},
235{
236 .name = "hmac(sha512)",
237
238 .uinfo = {
239 .auth = {
240 .icv_truncbits = 256,
241 .icv_fullbits = 512,
242 }
243 },
244
245 .desc = {
246 .sadb_alg_id = SADB_X_AALG_SHA2_512HMAC,
247 .sadb_alg_ivlen = 0,
248 .sadb_alg_minbits = 512,
249 .sadb_alg_maxbits = 512
250 }
251},
252{
Adrian-Ken Rueegseggera13366c2008-06-04 12:04:55 -0700253 .name = "hmac(rmd160)",
254 .compat = "rmd160",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256 .uinfo = {
257 .auth = {
258 .icv_truncbits = 96,
259 .icv_fullbits = 160,
260 }
261 },
262
263 .desc = {
264 .sadb_alg_id = SADB_X_AALG_RIPEMD160HMAC,
265 .sadb_alg_ivlen = 0,
266 .sadb_alg_minbits = 160,
267 .sadb_alg_maxbits = 160
268 }
269},
Kazunori MIYAZAWA7cf4c1a2006-10-28 13:21:22 +1000270{
271 .name = "xcbc(aes)",
272
273 .uinfo = {
274 .auth = {
275 .icv_truncbits = 96,
276 .icv_fullbits = 128,
277 }
278 },
279
280 .desc = {
281 .sadb_alg_id = SADB_X_AALG_AES_XCBC_MAC,
282 .sadb_alg_ivlen = 0,
283 .sadb_alg_minbits = 128,
284 .sadb_alg_maxbits = 128
285 }
286},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287};
288
289static struct xfrm_algo_desc ealg_list[] = {
290{
Herbert Xu6b7326c2006-07-30 15:41:01 +1000291 .name = "ecb(cipher_null)",
292 .compat = "cipher_null",
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 .uinfo = {
295 .encr = {
296 .blockbits = 8,
297 .defkeybits = 0,
298 }
299 },
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 .desc = {
302 .sadb_alg_id = SADB_EALG_NULL,
303 .sadb_alg_ivlen = 0,
304 .sadb_alg_minbits = 0,
305 .sadb_alg_maxbits = 0
306 }
307},
308{
Herbert Xu6b7326c2006-07-30 15:41:01 +1000309 .name = "cbc(des)",
310 .compat = "des",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312 .uinfo = {
313 .encr = {
314 .blockbits = 64,
315 .defkeybits = 64,
316 }
317 },
318
319 .desc = {
320 .sadb_alg_id = SADB_EALG_DESCBC,
321 .sadb_alg_ivlen = 8,
322 .sadb_alg_minbits = 64,
323 .sadb_alg_maxbits = 64
324 }
325},
326{
Herbert Xu6b7326c2006-07-30 15:41:01 +1000327 .name = "cbc(des3_ede)",
328 .compat = "des3_ede",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 .uinfo = {
331 .encr = {
332 .blockbits = 64,
333 .defkeybits = 192,
334 }
335 },
336
337 .desc = {
338 .sadb_alg_id = SADB_EALG_3DESCBC,
339 .sadb_alg_ivlen = 8,
340 .sadb_alg_minbits = 192,
341 .sadb_alg_maxbits = 192
342 }
343},
344{
Herbert Xu245acb82009-06-24 03:55:41 -0700345 .name = "cbc(cast5)",
346 .compat = "cast5",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348 .uinfo = {
349 .encr = {
350 .blockbits = 64,
351 .defkeybits = 128,
352 }
353 },
354
355 .desc = {
356 .sadb_alg_id = SADB_X_EALG_CASTCBC,
357 .sadb_alg_ivlen = 8,
358 .sadb_alg_minbits = 40,
359 .sadb_alg_maxbits = 128
360 }
361},
362{
Herbert Xu6b7326c2006-07-30 15:41:01 +1000363 .name = "cbc(blowfish)",
364 .compat = "blowfish",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366 .uinfo = {
367 .encr = {
368 .blockbits = 64,
369 .defkeybits = 128,
370 }
371 },
372
373 .desc = {
374 .sadb_alg_id = SADB_X_EALG_BLOWFISHCBC,
375 .sadb_alg_ivlen = 8,
376 .sadb_alg_minbits = 40,
377 .sadb_alg_maxbits = 448
378 }
379},
380{
Herbert Xu6b7326c2006-07-30 15:41:01 +1000381 .name = "cbc(aes)",
382 .compat = "aes",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384 .uinfo = {
385 .encr = {
386 .blockbits = 128,
387 .defkeybits = 128,
388 }
389 },
390
391 .desc = {
392 .sadb_alg_id = SADB_X_EALG_AESCBC,
393 .sadb_alg_ivlen = 8,
394 .sadb_alg_minbits = 128,
395 .sadb_alg_maxbits = 256
396 }
397},
398{
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900399 .name = "cbc(serpent)",
400 .compat = "serpent",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900402 .uinfo = {
403 .encr = {
404 .blockbits = 128,
405 .defkeybits = 128,
406 }
407 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900409 .desc = {
410 .sadb_alg_id = SADB_X_EALG_SERPENTCBC,
411 .sadb_alg_ivlen = 8,
412 .sadb_alg_minbits = 128,
413 .sadb_alg_maxbits = 256,
414 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415},
416{
Noriaki TAKAMIYA6a0dc8d2006-10-22 15:05:57 +1000417 .name = "cbc(camellia)",
Li Yewang138f3c82009-12-01 15:35:05 -0800418 .compat = "camellia",
Noriaki TAKAMIYA6a0dc8d2006-10-22 15:05:57 +1000419
420 .uinfo = {
421 .encr = {
422 .blockbits = 128,
423 .defkeybits = 128,
424 }
425 },
426
427 .desc = {
428 .sadb_alg_id = SADB_X_EALG_CAMELLIACBC,
429 .sadb_alg_ivlen = 8,
430 .sadb_alg_minbits = 128,
431 .sadb_alg_maxbits = 256
432 }
433},
434{
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900435 .name = "cbc(twofish)",
436 .compat = "twofish",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900438 .uinfo = {
439 .encr = {
440 .blockbits = 128,
441 .defkeybits = 128,
442 }
443 },
444
445 .desc = {
446 .sadb_alg_id = SADB_X_EALG_TWOFISHCBC,
447 .sadb_alg_ivlen = 8,
448 .sadb_alg_minbits = 128,
449 .sadb_alg_maxbits = 256
450 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451},
Joy Latten405137d2008-02-07 23:11:56 -0800452{
453 .name = "rfc3686(ctr(aes))",
454
455 .uinfo = {
456 .encr = {
457 .blockbits = 128,
458 .defkeybits = 160, /* 128-bit key + 32-bit nonce */
459 }
460 },
461
462 .desc = {
463 .sadb_alg_id = SADB_X_EALG_AESCTR,
464 .sadb_alg_ivlen = 8,
Tushar Gohad42032232011-07-28 10:36:20 +0000465 .sadb_alg_minbits = 160,
466 .sadb_alg_maxbits = 288
Joy Latten405137d2008-02-07 23:11:56 -0800467 }
468},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469};
470
471static struct xfrm_algo_desc calg_list[] = {
472{
473 .name = "deflate",
474 .uinfo = {
475 .comp = {
476 .threshold = 90,
477 }
478 },
479 .desc = { .sadb_alg_id = SADB_X_CALG_DEFLATE }
480},
481{
482 .name = "lzs",
483 .uinfo = {
484 .comp = {
485 .threshold = 90,
486 }
487 },
488 .desc = { .sadb_alg_id = SADB_X_CALG_LZS }
489},
490{
491 .name = "lzjh",
492 .uinfo = {
493 .comp = {
494 .threshold = 50,
495 }
496 },
497 .desc = { .sadb_alg_id = SADB_X_CALG_LZJH }
498},
499};
500
Herbert Xu1a6509d2008-01-28 19:37:29 -0800501static inline int aead_entries(void)
502{
503 return ARRAY_SIZE(aead_list);
504}
505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506static inline int aalg_entries(void)
507{
508 return ARRAY_SIZE(aalg_list);
509}
510
511static inline int ealg_entries(void)
512{
513 return ARRAY_SIZE(ealg_list);
514}
515
516static inline int calg_entries(void)
517{
518 return ARRAY_SIZE(calg_list);
519}
520
Herbert Xuc92b3a22007-05-19 14:21:18 -0700521struct xfrm_algo_list {
522 struct xfrm_algo_desc *algs;
523 int entries;
524 u32 type;
525 u32 mask;
526};
527
Herbert Xu1a6509d2008-01-28 19:37:29 -0800528static const struct xfrm_algo_list xfrm_aead_list = {
529 .algs = aead_list,
530 .entries = ARRAY_SIZE(aead_list),
531 .type = CRYPTO_ALG_TYPE_AEAD,
532 .mask = CRYPTO_ALG_TYPE_MASK,
533};
534
Herbert Xuc92b3a22007-05-19 14:21:18 -0700535static const struct xfrm_algo_list xfrm_aalg_list = {
536 .algs = aalg_list,
537 .entries = ARRAY_SIZE(aalg_list),
538 .type = CRYPTO_ALG_TYPE_HASH,
Herbert Xu6fbf2cb2008-01-28 19:35:49 -0800539 .mask = CRYPTO_ALG_TYPE_HASH_MASK,
Herbert Xuc92b3a22007-05-19 14:21:18 -0700540};
541
542static const struct xfrm_algo_list xfrm_ealg_list = {
543 .algs = ealg_list,
544 .entries = ARRAY_SIZE(ealg_list),
545 .type = CRYPTO_ALG_TYPE_BLKCIPHER,
Herbert Xu6fbf2cb2008-01-28 19:35:49 -0800546 .mask = CRYPTO_ALG_TYPE_BLKCIPHER_MASK,
Herbert Xuc92b3a22007-05-19 14:21:18 -0700547};
548
549static const struct xfrm_algo_list xfrm_calg_list = {
550 .algs = calg_list,
551 .entries = ARRAY_SIZE(calg_list),
552 .type = CRYPTO_ALG_TYPE_COMPRESS,
Herbert Xu6fbf2cb2008-01-28 19:35:49 -0800553 .mask = CRYPTO_ALG_TYPE_MASK,
Herbert Xuc92b3a22007-05-19 14:21:18 -0700554};
555
556static struct xfrm_algo_desc *xfrm_find_algo(
557 const struct xfrm_algo_list *algo_list,
558 int match(const struct xfrm_algo_desc *entry, const void *data),
559 const void *data, int probe)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560{
Herbert Xuc92b3a22007-05-19 14:21:18 -0700561 struct xfrm_algo_desc *list = algo_list->algs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 int i, status;
563
Herbert Xuc92b3a22007-05-19 14:21:18 -0700564 for (i = 0; i < algo_list->entries; i++) {
565 if (!match(list + i, data))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 continue;
567
568 if (list[i].available)
569 return &list[i];
570
571 if (!probe)
572 break;
573
Herbert Xuc92b3a22007-05-19 14:21:18 -0700574 status = crypto_has_alg(list[i].name, algo_list->type,
575 algo_list->mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 if (!status)
577 break;
578
579 list[i].available = status;
580 return &list[i];
581 }
582 return NULL;
583}
584
Herbert Xuc92b3a22007-05-19 14:21:18 -0700585static int xfrm_alg_id_match(const struct xfrm_algo_desc *entry,
586 const void *data)
587{
Herbert Xu26b8e512007-05-22 16:12:26 -0700588 return entry->desc.sadb_alg_id == (unsigned long)data;
Herbert Xuc92b3a22007-05-19 14:21:18 -0700589}
590
591struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id)
592{
593 return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_id_match,
Herbert Xu26b8e512007-05-22 16:12:26 -0700594 (void *)(unsigned long)alg_id, 1);
Herbert Xuc92b3a22007-05-19 14:21:18 -0700595}
596EXPORT_SYMBOL_GPL(xfrm_aalg_get_byid);
597
598struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id)
599{
600 return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_id_match,
Herbert Xu26b8e512007-05-22 16:12:26 -0700601 (void *)(unsigned long)alg_id, 1);
Herbert Xuc92b3a22007-05-19 14:21:18 -0700602}
603EXPORT_SYMBOL_GPL(xfrm_ealg_get_byid);
604
605struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id)
606{
607 return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_id_match,
Herbert Xu26b8e512007-05-22 16:12:26 -0700608 (void *)(unsigned long)alg_id, 1);
Herbert Xuc92b3a22007-05-19 14:21:18 -0700609}
610EXPORT_SYMBOL_GPL(xfrm_calg_get_byid);
611
612static int xfrm_alg_name_match(const struct xfrm_algo_desc *entry,
613 const void *data)
614{
615 const char *name = data;
616
617 return name && (!strcmp(name, entry->name) ||
618 (entry->compat && !strcmp(name, entry->compat)));
619}
620
David S. Miller6f2f19e2011-02-27 23:04:45 -0800621struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622{
Herbert Xuc92b3a22007-05-19 14:21:18 -0700623 return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_name_match, name,
624 probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626EXPORT_SYMBOL_GPL(xfrm_aalg_get_byname);
627
David S. Miller6f2f19e2011-02-27 23:04:45 -0800628struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629{
Herbert Xuc92b3a22007-05-19 14:21:18 -0700630 return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_name_match, name,
631 probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632}
633EXPORT_SYMBOL_GPL(xfrm_ealg_get_byname);
634
David S. Miller6f2f19e2011-02-27 23:04:45 -0800635struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
Herbert Xuc92b3a22007-05-19 14:21:18 -0700637 return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_name_match, name,
638 probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639}
640EXPORT_SYMBOL_GPL(xfrm_calg_get_byname);
641
Herbert Xu1a6509d2008-01-28 19:37:29 -0800642struct xfrm_aead_name {
643 const char *name;
644 int icvbits;
645};
646
647static int xfrm_aead_name_match(const struct xfrm_algo_desc *entry,
648 const void *data)
649{
650 const struct xfrm_aead_name *aead = data;
651 const char *name = aead->name;
652
653 return aead->icvbits == entry->uinfo.aead.icv_truncbits && name &&
654 !strcmp(name, entry->name);
655}
656
David S. Miller6f2f19e2011-02-27 23:04:45 -0800657struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, int probe)
Herbert Xu1a6509d2008-01-28 19:37:29 -0800658{
659 struct xfrm_aead_name data = {
660 .name = name,
661 .icvbits = icv_len,
662 };
663
664 return xfrm_find_algo(&xfrm_aead_list, xfrm_aead_name_match, &data,
665 probe);
666}
667EXPORT_SYMBOL_GPL(xfrm_aead_get_byname);
668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx)
670{
671 if (idx >= aalg_entries())
672 return NULL;
673
674 return &aalg_list[idx];
675}
676EXPORT_SYMBOL_GPL(xfrm_aalg_get_byidx);
677
678struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx)
679{
680 if (idx >= ealg_entries())
681 return NULL;
682
683 return &ealg_list[idx];
684}
685EXPORT_SYMBOL_GPL(xfrm_ealg_get_byidx);
686
687/*
688 * Probe for the availability of crypto algorithms, and set the available
689 * flag for any algorithms found on the system. This is typically called by
690 * pfkey during userspace SA add, update or register.
691 */
692void xfrm_probe_algs(void)
693{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 int i, status;
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900695
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 BUG_ON(in_softirq());
697
698 for (i = 0; i < aalg_entries(); i++) {
Herbert Xue4d5b792006-08-26 18:12:40 +1000699 status = crypto_has_hash(aalg_list[i].name, 0,
700 CRYPTO_ALG_ASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (aalg_list[i].available != status)
702 aalg_list[i].available = status;
703 }
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 for (i = 0; i < ealg_entries(); i++) {
Herbert Xue4d5b792006-08-26 18:12:40 +1000706 status = crypto_has_blkcipher(ealg_list[i].name, 0,
707 CRYPTO_ALG_ASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 if (ealg_list[i].available != status)
709 ealg_list[i].available = status;
710 }
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900711
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 for (i = 0; i < calg_entries(); i++) {
Herbert Xue4d5b792006-08-26 18:12:40 +1000713 status = crypto_has_comp(calg_list[i].name, 0,
714 CRYPTO_ALG_ASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 if (calg_list[i].available != status)
716 calg_list[i].available = status;
717 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718}
719EXPORT_SYMBOL_GPL(xfrm_probe_algs);
720
721int xfrm_count_auth_supported(void)
722{
723 int i, n;
724
725 for (i = 0, n = 0; i < aalg_entries(); i++)
726 if (aalg_list[i].available)
727 n++;
728 return n;
729}
730EXPORT_SYMBOL_GPL(xfrm_count_auth_supported);
731
732int xfrm_count_enc_supported(void)
733{
734 int i, n;
735
736 for (i = 0, n = 0; i < ealg_entries(); i++)
737 if (ealg_list[i].available)
738 n++;
739 return n;
740}
741EXPORT_SYMBOL_GPL(xfrm_count_enc_supported);
742
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
744
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len)
746{
747 if (tail != skb) {
748 skb->data_len += len;
749 skb->len += len;
750 }
751 return skb_put(tail, len);
752}
753EXPORT_SYMBOL_GPL(pskb_put);
754#endif