Commit | Line | Data |
---|---|---|
a38f7907 SK |
1 | /* |
2 | * Crypto user configuration API. | |
3 | * | |
4 | * Copyright (C) 2011 secunet Security Networks AG | |
5 | * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/crypto.h> | |
23 | #include <linux/cryptouser.h> | |
1e122994 | 24 | #include <linux/sched.h> |
a38f7907 SK |
25 | #include <net/netlink.h> |
26 | #include <linux/security.h> | |
27 | #include <net/net_namespace.h> | |
1e122994 SK |
28 | #include <crypto/internal/aead.h> |
29 | #include <crypto/internal/skcipher.h> | |
9aa867e4 | 30 | #include <crypto/internal/rng.h> |
3c339ab8 | 31 | #include <crypto/akcipher.h> |
1e122994 | 32 | |
a38f7907 SK |
33 | #include "internal.h" |
34 | ||
8fd61d34 MK |
35 | #define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x)) |
36 | ||
66ce0b0f | 37 | static DEFINE_MUTEX(crypto_cfg_mutex); |
a38f7907 SK |
38 | |
39 | /* The crypto netlink socket */ | |
40 | static struct sock *crypto_nlsk; | |
41 | ||
42 | struct crypto_dump_info { | |
43 | struct sk_buff *in_skb; | |
44 | struct sk_buff *out_skb; | |
45 | u32 nlmsg_seq; | |
46 | u16 nlmsg_flags; | |
47 | }; | |
48 | ||
49 | static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact) | |
50 | { | |
a38f7907 SK |
51 | struct crypto_alg *q, *alg = NULL; |
52 | ||
53 | down_read(&crypto_alg_sem); | |
54 | ||
a38f7907 | 55 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
e6ea64ec | 56 | int match = 0; |
a38f7907 SK |
57 | |
58 | if ((q->cra_flags ^ p->cru_type) & p->cru_mask) | |
59 | continue; | |
60 | ||
61 | if (strlen(p->cru_driver_name)) | |
62 | match = !strcmp(q->cra_driver_name, | |
63 | p->cru_driver_name); | |
64 | else if (!exact) | |
65 | match = !strcmp(q->cra_name, p->cru_name); | |
66 | ||
016baaa1 HX |
67 | if (!match) |
68 | continue; | |
69 | ||
70 | if (unlikely(!crypto_mod_get(q))) | |
71 | continue; | |
72 | ||
73 | alg = q; | |
74 | break; | |
a38f7907 SK |
75 | } |
76 | ||
77 | up_read(&crypto_alg_sem); | |
78 | ||
79 | return alg; | |
80 | } | |
81 | ||
07a5fa4a SK |
82 | static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg) |
83 | { | |
84 | struct crypto_report_cipher rcipher; | |
85 | ||
9a5467bf | 86 | strncpy(rcipher.type, "cipher", sizeof(rcipher.type)); |
07a5fa4a SK |
87 | |
88 | rcipher.blocksize = alg->cra_blocksize; | |
89 | rcipher.min_keysize = alg->cra_cipher.cia_min_keysize; | |
90 | rcipher.max_keysize = alg->cra_cipher.cia_max_keysize; | |
91 | ||
6662df33 DM |
92 | if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER, |
93 | sizeof(struct crypto_report_cipher), &rcipher)) | |
94 | goto nla_put_failure; | |
07a5fa4a SK |
95 | return 0; |
96 | ||
97 | nla_put_failure: | |
98 | return -EMSGSIZE; | |
99 | } | |
100 | ||
540b97c1 SK |
101 | static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg) |
102 | { | |
103 | struct crypto_report_comp rcomp; | |
104 | ||
9a5467bf | 105 | strncpy(rcomp.type, "compression", sizeof(rcomp.type)); |
6662df33 DM |
106 | if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, |
107 | sizeof(struct crypto_report_comp), &rcomp)) | |
108 | goto nla_put_failure; | |
540b97c1 SK |
109 | return 0; |
110 | ||
111 | nla_put_failure: | |
112 | return -EMSGSIZE; | |
113 | } | |
114 | ||
3c339ab8 TS |
115 | static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg) |
116 | { | |
117 | struct crypto_report_akcipher rakcipher; | |
118 | ||
119 | strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); | |
120 | ||
121 | if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, | |
122 | sizeof(struct crypto_report_akcipher), &rakcipher)) | |
123 | goto nla_put_failure; | |
124 | return 0; | |
125 | ||
126 | nla_put_failure: | |
127 | return -EMSGSIZE; | |
128 | } | |
129 | ||
a38f7907 SK |
130 | static int crypto_report_one(struct crypto_alg *alg, |
131 | struct crypto_user_alg *ualg, struct sk_buff *skb) | |
132 | { | |
9a5467bf MK |
133 | strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name)); |
134 | strncpy(ualg->cru_driver_name, alg->cra_driver_name, | |
135 | sizeof(ualg->cru_driver_name)); | |
136 | strncpy(ualg->cru_module_name, module_name(alg->cra_module), | |
137 | sizeof(ualg->cru_module_name)); | |
138 | ||
139 | ualg->cru_type = 0; | |
140 | ualg->cru_mask = 0; | |
a38f7907 SK |
141 | ualg->cru_flags = alg->cra_flags; |
142 | ualg->cru_refcnt = atomic_read(&alg->cra_refcnt); | |
143 | ||
6662df33 DM |
144 | if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority)) |
145 | goto nla_put_failure; | |
6c5a86f5 SK |
146 | if (alg->cra_flags & CRYPTO_ALG_LARVAL) { |
147 | struct crypto_report_larval rl; | |
148 | ||
9a5467bf | 149 | strncpy(rl.type, "larval", sizeof(rl.type)); |
6662df33 DM |
150 | if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL, |
151 | sizeof(struct crypto_report_larval), &rl)) | |
152 | goto nla_put_failure; | |
6c5a86f5 SK |
153 | goto out; |
154 | } | |
155 | ||
b6aa63c0 SK |
156 | if (alg->cra_type && alg->cra_type->report) { |
157 | if (alg->cra_type->report(skb, alg)) | |
158 | goto nla_put_failure; | |
07a5fa4a SK |
159 | |
160 | goto out; | |
161 | } | |
162 | ||
163 | switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) { | |
164 | case CRYPTO_ALG_TYPE_CIPHER: | |
165 | if (crypto_report_cipher(skb, alg)) | |
166 | goto nla_put_failure; | |
167 | ||
540b97c1 SK |
168 | break; |
169 | case CRYPTO_ALG_TYPE_COMPRESS: | |
170 | if (crypto_report_comp(skb, alg)) | |
171 | goto nla_put_failure; | |
172 | ||
07a5fa4a | 173 | break; |
3c339ab8 TS |
174 | |
175 | case CRYPTO_ALG_TYPE_AKCIPHER: | |
176 | if (crypto_report_akcipher(skb, alg)) | |
177 | goto nla_put_failure; | |
178 | ||
179 | break; | |
b6aa63c0 SK |
180 | } |
181 | ||
6c5a86f5 | 182 | out: |
a38f7907 SK |
183 | return 0; |
184 | ||
185 | nla_put_failure: | |
186 | return -EMSGSIZE; | |
187 | } | |
188 | ||
189 | static int crypto_report_alg(struct crypto_alg *alg, | |
190 | struct crypto_dump_info *info) | |
191 | { | |
192 | struct sk_buff *in_skb = info->in_skb; | |
193 | struct sk_buff *skb = info->out_skb; | |
194 | struct nlmsghdr *nlh; | |
195 | struct crypto_user_alg *ualg; | |
196 | int err = 0; | |
197 | ||
15e47304 | 198 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq, |
a38f7907 SK |
199 | CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags); |
200 | if (!nlh) { | |
201 | err = -EMSGSIZE; | |
202 | goto out; | |
203 | } | |
204 | ||
205 | ualg = nlmsg_data(nlh); | |
206 | ||
207 | err = crypto_report_one(alg, ualg, skb); | |
208 | if (err) { | |
209 | nlmsg_cancel(skb, nlh); | |
210 | goto out; | |
211 | } | |
212 | ||
213 | nlmsg_end(skb, nlh); | |
214 | ||
215 | out: | |
216 | return err; | |
217 | } | |
218 | ||
219 | static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, | |
220 | struct nlattr **attrs) | |
221 | { | |
222 | struct crypto_user_alg *p = nlmsg_data(in_nlh); | |
223 | struct crypto_alg *alg; | |
224 | struct sk_buff *skb; | |
225 | struct crypto_dump_info info; | |
226 | int err; | |
227 | ||
8fd61d34 MK |
228 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
229 | return -EINVAL; | |
230 | ||
5d4a5e77 | 231 | alg = crypto_alg_match(p, 0); |
a38f7907 SK |
232 | if (!alg) |
233 | return -ENOENT; | |
234 | ||
016baaa1 | 235 | err = -ENOMEM; |
a38f7907 SK |
236 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
237 | if (!skb) | |
016baaa1 | 238 | goto drop_alg; |
a38f7907 SK |
239 | |
240 | info.in_skb = in_skb; | |
241 | info.out_skb = skb; | |
242 | info.nlmsg_seq = in_nlh->nlmsg_seq; | |
243 | info.nlmsg_flags = 0; | |
244 | ||
245 | err = crypto_report_alg(alg, &info); | |
016baaa1 HX |
246 | |
247 | drop_alg: | |
248 | crypto_mod_put(alg); | |
249 | ||
a38f7907 SK |
250 | if (err) |
251 | return err; | |
252 | ||
15e47304 | 253 | return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid); |
a38f7907 SK |
254 | } |
255 | ||
256 | static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb) | |
257 | { | |
258 | struct crypto_alg *alg; | |
259 | struct crypto_dump_info info; | |
260 | int err; | |
261 | ||
262 | if (cb->args[0]) | |
263 | goto out; | |
264 | ||
265 | cb->args[0] = 1; | |
266 | ||
267 | info.in_skb = cb->skb; | |
268 | info.out_skb = skb; | |
269 | info.nlmsg_seq = cb->nlh->nlmsg_seq; | |
270 | info.nlmsg_flags = NLM_F_MULTI; | |
271 | ||
272 | list_for_each_entry(alg, &crypto_alg_list, cra_list) { | |
273 | err = crypto_report_alg(alg, &info); | |
274 | if (err) | |
275 | goto out_err; | |
276 | } | |
277 | ||
278 | out: | |
279 | return skb->len; | |
280 | out_err: | |
281 | return err; | |
282 | } | |
283 | ||
284 | static int crypto_dump_report_done(struct netlink_callback *cb) | |
285 | { | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh, | |
290 | struct nlattr **attrs) | |
291 | { | |
292 | struct crypto_alg *alg; | |
293 | struct crypto_user_alg *p = nlmsg_data(nlh); | |
294 | struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; | |
295 | LIST_HEAD(list); | |
296 | ||
639b4ac6 | 297 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
c568398a MCO |
298 | return -EPERM; |
299 | ||
8fd61d34 MK |
300 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
301 | return -EINVAL; | |
302 | ||
a38f7907 SK |
303 | if (priority && !strlen(p->cru_driver_name)) |
304 | return -EINVAL; | |
305 | ||
306 | alg = crypto_alg_match(p, 1); | |
307 | if (!alg) | |
308 | return -ENOENT; | |
309 | ||
310 | down_write(&crypto_alg_sem); | |
311 | ||
312 | crypto_remove_spawns(alg, &list, NULL); | |
313 | ||
314 | if (priority) | |
315 | alg->cra_priority = nla_get_u32(priority); | |
316 | ||
317 | up_write(&crypto_alg_sem); | |
318 | ||
016baaa1 | 319 | crypto_mod_put(alg); |
a38f7907 SK |
320 | crypto_remove_final(&list); |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh, | |
326 | struct nlattr **attrs) | |
327 | { | |
328 | struct crypto_alg *alg; | |
329 | struct crypto_user_alg *p = nlmsg_data(nlh); | |
016baaa1 | 330 | int err; |
a38f7907 | 331 | |
639b4ac6 | 332 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
c568398a MCO |
333 | return -EPERM; |
334 | ||
8fd61d34 MK |
335 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
336 | return -EINVAL; | |
337 | ||
a38f7907 SK |
338 | alg = crypto_alg_match(p, 1); |
339 | if (!alg) | |
340 | return -ENOENT; | |
341 | ||
342 | /* We can not unregister core algorithms such as aes-generic. | |
343 | * We would loose the reference in the crypto_alg_list to this algorithm | |
344 | * if we try to unregister. Unregistering such an algorithm without | |
345 | * removing the module is not possible, so we restrict to crypto | |
346 | * instances that are build from templates. */ | |
016baaa1 | 347 | err = -EINVAL; |
a38f7907 | 348 | if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE)) |
016baaa1 | 349 | goto drop_alg; |
a38f7907 | 350 | |
016baaa1 HX |
351 | err = -EBUSY; |
352 | if (atomic_read(&alg->cra_refcnt) > 2) | |
353 | goto drop_alg; | |
a38f7907 | 354 | |
016baaa1 HX |
355 | err = crypto_unregister_instance((struct crypto_instance *)alg); |
356 | ||
357 | drop_alg: | |
358 | crypto_mod_put(alg); | |
359 | return err; | |
a38f7907 SK |
360 | } |
361 | ||
1e122994 SK |
362 | static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type, |
363 | u32 mask) | |
364 | { | |
365 | int err; | |
366 | struct crypto_alg *alg; | |
367 | ||
368 | type = crypto_skcipher_type(type); | |
369 | mask = crypto_skcipher_mask(mask); | |
370 | ||
371 | for (;;) { | |
372 | alg = crypto_lookup_skcipher(name, type, mask); | |
373 | if (!IS_ERR(alg)) | |
374 | return alg; | |
375 | ||
376 | err = PTR_ERR(alg); | |
377 | if (err != -EAGAIN) | |
378 | break; | |
379 | if (signal_pending(current)) { | |
380 | err = -EINTR; | |
381 | break; | |
382 | } | |
383 | } | |
384 | ||
385 | return ERR_PTR(err); | |
386 | } | |
387 | ||
388 | static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type, | |
389 | u32 mask) | |
390 | { | |
391 | int err; | |
392 | struct crypto_alg *alg; | |
393 | ||
394 | type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); | |
395 | type |= CRYPTO_ALG_TYPE_AEAD; | |
396 | mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); | |
397 | mask |= CRYPTO_ALG_TYPE_MASK; | |
398 | ||
399 | for (;;) { | |
400 | alg = crypto_lookup_aead(name, type, mask); | |
401 | if (!IS_ERR(alg)) | |
402 | return alg; | |
403 | ||
404 | err = PTR_ERR(alg); | |
405 | if (err != -EAGAIN) | |
406 | break; | |
407 | if (signal_pending(current)) { | |
408 | err = -EINTR; | |
409 | break; | |
410 | } | |
411 | } | |
412 | ||
413 | return ERR_PTR(err); | |
414 | } | |
415 | ||
a38f7907 SK |
416 | static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
417 | struct nlattr **attrs) | |
418 | { | |
0cfdec7a | 419 | int exact = 0; |
a38f7907 SK |
420 | const char *name; |
421 | struct crypto_alg *alg; | |
422 | struct crypto_user_alg *p = nlmsg_data(nlh); | |
423 | struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; | |
424 | ||
639b4ac6 | 425 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
c568398a MCO |
426 | return -EPERM; |
427 | ||
8fd61d34 MK |
428 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
429 | return -EINVAL; | |
430 | ||
a38f7907 SK |
431 | if (strlen(p->cru_driver_name)) |
432 | exact = 1; | |
433 | ||
434 | if (priority && !exact) | |
435 | return -EINVAL; | |
436 | ||
437 | alg = crypto_alg_match(p, exact); | |
016baaa1 HX |
438 | if (alg) { |
439 | crypto_mod_put(alg); | |
a38f7907 | 440 | return -EEXIST; |
016baaa1 | 441 | } |
a38f7907 SK |
442 | |
443 | if (strlen(p->cru_driver_name)) | |
444 | name = p->cru_driver_name; | |
445 | else | |
446 | name = p->cru_name; | |
447 | ||
1e122994 SK |
448 | switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) { |
449 | case CRYPTO_ALG_TYPE_AEAD: | |
450 | alg = crypto_user_aead_alg(name, p->cru_type, p->cru_mask); | |
451 | break; | |
452 | case CRYPTO_ALG_TYPE_GIVCIPHER: | |
453 | case CRYPTO_ALG_TYPE_BLKCIPHER: | |
454 | case CRYPTO_ALG_TYPE_ABLKCIPHER: | |
455 | alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask); | |
456 | break; | |
457 | default: | |
458 | alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask); | |
459 | } | |
460 | ||
a38f7907 SK |
461 | if (IS_ERR(alg)) |
462 | return PTR_ERR(alg); | |
463 | ||
464 | down_write(&crypto_alg_sem); | |
465 | ||
466 | if (priority) | |
467 | alg->cra_priority = nla_get_u32(priority); | |
468 | ||
469 | up_write(&crypto_alg_sem); | |
470 | ||
471 | crypto_mod_put(alg); | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
9aa867e4 HX |
476 | static int crypto_del_rng(struct sk_buff *skb, struct nlmsghdr *nlh, |
477 | struct nlattr **attrs) | |
478 | { | |
479 | if (!netlink_capable(skb, CAP_NET_ADMIN)) | |
480 | return -EPERM; | |
481 | return crypto_del_default_rng(); | |
482 | } | |
483 | ||
a38f7907 SK |
484 | #define MSGSIZE(type) sizeof(struct type) |
485 | ||
486 | static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = { | |
487 | [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), | |
488 | [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), | |
489 | [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), | |
9aa867e4 | 490 | [CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0, |
a38f7907 SK |
491 | }; |
492 | ||
493 | static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = { | |
494 | [CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32}, | |
495 | }; | |
496 | ||
497 | #undef MSGSIZE | |
498 | ||
a84fb791 | 499 | static const struct crypto_link { |
a38f7907 SK |
500 | int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); |
501 | int (*dump)(struct sk_buff *, struct netlink_callback *); | |
502 | int (*done)(struct netlink_callback *); | |
503 | } crypto_dispatch[CRYPTO_NR_MSGTYPES] = { | |
504 | [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg}, | |
505 | [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg}, | |
506 | [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg}, | |
507 | [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report, | |
508 | .dump = crypto_dump_report, | |
509 | .done = crypto_dump_report_done}, | |
9aa867e4 | 510 | [CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng }, |
a38f7907 SK |
511 | }; |
512 | ||
513 | static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
514 | { | |
515 | struct nlattr *attrs[CRYPTOCFGA_MAX+1]; | |
a84fb791 | 516 | const struct crypto_link *link; |
a38f7907 SK |
517 | int type, err; |
518 | ||
519 | type = nlh->nlmsg_type; | |
520 | if (type > CRYPTO_MSG_MAX) | |
521 | return -EINVAL; | |
522 | ||
523 | type -= CRYPTO_MSG_BASE; | |
524 | link = &crypto_dispatch[type]; | |
525 | ||
a38f7907 SK |
526 | if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) && |
527 | (nlh->nlmsg_flags & NLM_F_DUMP))) { | |
5219a534 SK |
528 | struct crypto_alg *alg; |
529 | u16 dump_alloc = 0; | |
530 | ||
a38f7907 SK |
531 | if (link->dump == NULL) |
532 | return -EINVAL; | |
5219a534 SK |
533 | |
534 | list_for_each_entry(alg, &crypto_alg_list, cra_list) | |
535 | dump_alloc += CRYPTO_REPORT_MAXSIZE; | |
536 | ||
80d326fa PNA |
537 | { |
538 | struct netlink_dump_control c = { | |
539 | .dump = link->dump, | |
540 | .done = link->done, | |
5219a534 | 541 | .min_dump_alloc = dump_alloc, |
80d326fa PNA |
542 | }; |
543 | return netlink_dump_start(crypto_nlsk, skb, nlh, &c); | |
544 | } | |
a38f7907 SK |
545 | } |
546 | ||
547 | err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX, | |
548 | crypto_policy); | |
549 | if (err < 0) | |
550 | return err; | |
551 | ||
552 | if (link->doit == NULL) | |
553 | return -EINVAL; | |
554 | ||
555 | return link->doit(skb, nlh, attrs); | |
556 | } | |
557 | ||
558 | static void crypto_netlink_rcv(struct sk_buff *skb) | |
559 | { | |
560 | mutex_lock(&crypto_cfg_mutex); | |
561 | netlink_rcv_skb(skb, &crypto_user_rcv_msg); | |
562 | mutex_unlock(&crypto_cfg_mutex); | |
563 | } | |
564 | ||
565 | static int __init crypto_user_init(void) | |
566 | { | |
a31f2d17 PNA |
567 | struct netlink_kernel_cfg cfg = { |
568 | .input = crypto_netlink_rcv, | |
569 | }; | |
570 | ||
9f00d977 | 571 | crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg); |
a38f7907 SK |
572 | if (!crypto_nlsk) |
573 | return -ENOMEM; | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static void __exit crypto_user_exit(void) | |
579 | { | |
580 | netlink_kernel_release(crypto_nlsk); | |
581 | } | |
582 | ||
583 | module_init(crypto_user_init); | |
584 | module_exit(crypto_user_exit); | |
585 | MODULE_LICENSE("GPL"); | |
586 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
587 | MODULE_DESCRIPTION("Crypto userspace configuration API"); | |
476c7fe2 | 588 | MODULE_ALIAS("net-pf-16-proto-21"); |