tools: PCI: Fix compilation warnings
[linux-stable.git] / crypto / crypto_user.c
blob2b8fb8f1391e084dba43c371fff4138e904436cd
1 /*
2 * Crypto user configuration API.
4 * Copyright (C) 2011 secunet Security Networks AG
5 * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
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.
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.
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.
21 #include <linux/module.h>
22 #include <linux/crypto.h>
23 #include <linux/cryptouser.h>
24 #include <linux/sched.h>
25 #include <net/netlink.h>
26 #include <linux/security.h>
27 #include <net/net_namespace.h>
28 #include <crypto/internal/skcipher.h>
29 #include <crypto/internal/rng.h>
30 #include <crypto/akcipher.h>
31 #include <crypto/kpp.h>
33 #include "internal.h"
35 #define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
37 static DEFINE_MUTEX(crypto_cfg_mutex);
39 /* The crypto netlink socket */
40 static struct sock *crypto_nlsk;
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;
49 static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact)
51 struct crypto_alg *q, *alg = NULL;
53 down_read(&crypto_alg_sem);
55 list_for_each_entry(q, &crypto_alg_list, cra_list) {
56 int match = 0;
58 if (crypto_is_larval(q))
59 continue;
61 if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
62 continue;
64 if (strlen(p->cru_driver_name))
65 match = !strcmp(q->cra_driver_name,
66 p->cru_driver_name);
67 else if (!exact)
68 match = !strcmp(q->cra_name, p->cru_name);
70 if (!match)
71 continue;
73 if (unlikely(!crypto_mod_get(q)))
74 continue;
76 alg = q;
77 break;
80 up_read(&crypto_alg_sem);
82 return alg;
85 static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
87 struct crypto_report_cipher rcipher;
89 strncpy(rcipher.type, "cipher", sizeof(rcipher.type));
91 rcipher.blocksize = alg->cra_blocksize;
92 rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
93 rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
95 if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
96 sizeof(struct crypto_report_cipher), &rcipher))
97 goto nla_put_failure;
98 return 0;
100 nla_put_failure:
101 return -EMSGSIZE;
104 static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
106 struct crypto_report_comp rcomp;
108 strncpy(rcomp.type, "compression", sizeof(rcomp.type));
109 if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
110 sizeof(struct crypto_report_comp), &rcomp))
111 goto nla_put_failure;
112 return 0;
114 nla_put_failure:
115 return -EMSGSIZE;
118 static int crypto_report_acomp(struct sk_buff *skb, struct crypto_alg *alg)
120 struct crypto_report_acomp racomp;
122 strncpy(racomp.type, "acomp", sizeof(racomp.type));
124 if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
125 sizeof(struct crypto_report_acomp), &racomp))
126 goto nla_put_failure;
127 return 0;
129 nla_put_failure:
130 return -EMSGSIZE;
133 static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
135 struct crypto_report_akcipher rakcipher;
137 strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
139 if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
140 sizeof(struct crypto_report_akcipher), &rakcipher))
141 goto nla_put_failure;
142 return 0;
144 nla_put_failure:
145 return -EMSGSIZE;
148 static int crypto_report_kpp(struct sk_buff *skb, struct crypto_alg *alg)
150 struct crypto_report_kpp rkpp;
152 strncpy(rkpp.type, "kpp", sizeof(rkpp.type));
154 if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
155 sizeof(struct crypto_report_kpp), &rkpp))
156 goto nla_put_failure;
157 return 0;
159 nla_put_failure:
160 return -EMSGSIZE;
163 static int crypto_report_one(struct crypto_alg *alg,
164 struct crypto_user_alg *ualg, struct sk_buff *skb)
166 strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
167 strncpy(ualg->cru_driver_name, alg->cra_driver_name,
168 sizeof(ualg->cru_driver_name));
169 strncpy(ualg->cru_module_name, module_name(alg->cra_module),
170 sizeof(ualg->cru_module_name));
172 ualg->cru_type = 0;
173 ualg->cru_mask = 0;
174 ualg->cru_flags = alg->cra_flags;
175 ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
177 if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
178 goto nla_put_failure;
179 if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
180 struct crypto_report_larval rl;
182 strncpy(rl.type, "larval", sizeof(rl.type));
183 if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
184 sizeof(struct crypto_report_larval), &rl))
185 goto nla_put_failure;
186 goto out;
189 if (alg->cra_type && alg->cra_type->report) {
190 if (alg->cra_type->report(skb, alg))
191 goto nla_put_failure;
193 goto out;
196 switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
197 case CRYPTO_ALG_TYPE_CIPHER:
198 if (crypto_report_cipher(skb, alg))
199 goto nla_put_failure;
201 break;
202 case CRYPTO_ALG_TYPE_COMPRESS:
203 if (crypto_report_comp(skb, alg))
204 goto nla_put_failure;
206 break;
207 case CRYPTO_ALG_TYPE_ACOMPRESS:
208 if (crypto_report_acomp(skb, alg))
209 goto nla_put_failure;
211 break;
212 case CRYPTO_ALG_TYPE_AKCIPHER:
213 if (crypto_report_akcipher(skb, alg))
214 goto nla_put_failure;
216 break;
217 case CRYPTO_ALG_TYPE_KPP:
218 if (crypto_report_kpp(skb, alg))
219 goto nla_put_failure;
220 break;
223 out:
224 return 0;
226 nla_put_failure:
227 return -EMSGSIZE;
230 static int crypto_report_alg(struct crypto_alg *alg,
231 struct crypto_dump_info *info)
233 struct sk_buff *in_skb = info->in_skb;
234 struct sk_buff *skb = info->out_skb;
235 struct nlmsghdr *nlh;
236 struct crypto_user_alg *ualg;
237 int err = 0;
239 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
240 CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
241 if (!nlh) {
242 err = -EMSGSIZE;
243 goto out;
246 ualg = nlmsg_data(nlh);
248 err = crypto_report_one(alg, ualg, skb);
249 if (err) {
250 nlmsg_cancel(skb, nlh);
251 goto out;
254 nlmsg_end(skb, nlh);
256 out:
257 return err;
260 static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
261 struct nlattr **attrs)
263 struct crypto_user_alg *p = nlmsg_data(in_nlh);
264 struct crypto_alg *alg;
265 struct sk_buff *skb;
266 struct crypto_dump_info info;
267 int err;
269 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
270 return -EINVAL;
272 alg = crypto_alg_match(p, 0);
273 if (!alg)
274 return -ENOENT;
276 err = -ENOMEM;
277 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
278 if (!skb)
279 goto drop_alg;
281 info.in_skb = in_skb;
282 info.out_skb = skb;
283 info.nlmsg_seq = in_nlh->nlmsg_seq;
284 info.nlmsg_flags = 0;
286 err = crypto_report_alg(alg, &info);
288 drop_alg:
289 crypto_mod_put(alg);
291 if (err)
292 return err;
294 return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
297 static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
299 struct crypto_alg *alg;
300 struct crypto_dump_info info;
301 int err;
303 if (cb->args[0])
304 goto out;
306 cb->args[0] = 1;
308 info.in_skb = cb->skb;
309 info.out_skb = skb;
310 info.nlmsg_seq = cb->nlh->nlmsg_seq;
311 info.nlmsg_flags = NLM_F_MULTI;
313 list_for_each_entry(alg, &crypto_alg_list, cra_list) {
314 err = crypto_report_alg(alg, &info);
315 if (err)
316 goto out_err;
319 out:
320 return skb->len;
321 out_err:
322 return err;
325 static int crypto_dump_report_done(struct netlink_callback *cb)
327 return 0;
330 static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
331 struct nlattr **attrs)
333 struct crypto_alg *alg;
334 struct crypto_user_alg *p = nlmsg_data(nlh);
335 struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
336 LIST_HEAD(list);
338 if (!netlink_capable(skb, CAP_NET_ADMIN))
339 return -EPERM;
341 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
342 return -EINVAL;
344 if (priority && !strlen(p->cru_driver_name))
345 return -EINVAL;
347 alg = crypto_alg_match(p, 1);
348 if (!alg)
349 return -ENOENT;
351 down_write(&crypto_alg_sem);
353 crypto_remove_spawns(alg, &list, NULL);
355 if (priority)
356 alg->cra_priority = nla_get_u32(priority);
358 up_write(&crypto_alg_sem);
360 crypto_mod_put(alg);
361 crypto_remove_final(&list);
363 return 0;
366 static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
367 struct nlattr **attrs)
369 struct crypto_alg *alg;
370 struct crypto_user_alg *p = nlmsg_data(nlh);
371 int err;
373 if (!netlink_capable(skb, CAP_NET_ADMIN))
374 return -EPERM;
376 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
377 return -EINVAL;
379 alg = crypto_alg_match(p, 1);
380 if (!alg)
381 return -ENOENT;
383 /* We can not unregister core algorithms such as aes-generic.
384 * We would loose the reference in the crypto_alg_list to this algorithm
385 * if we try to unregister. Unregistering such an algorithm without
386 * removing the module is not possible, so we restrict to crypto
387 * instances that are build from templates. */
388 err = -EINVAL;
389 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
390 goto drop_alg;
392 err = -EBUSY;
393 if (atomic_read(&alg->cra_refcnt) > 2)
394 goto drop_alg;
396 err = crypto_unregister_instance((struct crypto_instance *)alg);
398 drop_alg:
399 crypto_mod_put(alg);
400 return err;
403 static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
404 struct nlattr **attrs)
406 int exact = 0;
407 const char *name;
408 struct crypto_alg *alg;
409 struct crypto_user_alg *p = nlmsg_data(nlh);
410 struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
412 if (!netlink_capable(skb, CAP_NET_ADMIN))
413 return -EPERM;
415 if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
416 return -EINVAL;
418 if (strlen(p->cru_driver_name))
419 exact = 1;
421 if (priority && !exact)
422 return -EINVAL;
424 alg = crypto_alg_match(p, exact);
425 if (alg) {
426 crypto_mod_put(alg);
427 return -EEXIST;
430 if (strlen(p->cru_driver_name))
431 name = p->cru_driver_name;
432 else
433 name = p->cru_name;
435 alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
436 if (IS_ERR(alg))
437 return PTR_ERR(alg);
439 down_write(&crypto_alg_sem);
441 if (priority)
442 alg->cra_priority = nla_get_u32(priority);
444 up_write(&crypto_alg_sem);
446 crypto_mod_put(alg);
448 return 0;
451 static int crypto_del_rng(struct sk_buff *skb, struct nlmsghdr *nlh,
452 struct nlattr **attrs)
454 if (!netlink_capable(skb, CAP_NET_ADMIN))
455 return -EPERM;
456 return crypto_del_default_rng();
459 #define MSGSIZE(type) sizeof(struct type)
461 static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
462 [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
463 [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
464 [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
465 [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
466 [CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
469 static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
470 [CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
473 #undef MSGSIZE
475 static const struct crypto_link {
476 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
477 int (*dump)(struct sk_buff *, struct netlink_callback *);
478 int (*done)(struct netlink_callback *);
479 } crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
480 [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
481 [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
482 [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
483 [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
484 .dump = crypto_dump_report,
485 .done = crypto_dump_report_done},
486 [CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
489 static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
490 struct netlink_ext_ack *extack)
492 struct nlattr *attrs[CRYPTOCFGA_MAX+1];
493 const struct crypto_link *link;
494 int type, err;
496 type = nlh->nlmsg_type;
497 if (type > CRYPTO_MSG_MAX)
498 return -EINVAL;
500 type -= CRYPTO_MSG_BASE;
501 link = &crypto_dispatch[type];
503 if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
504 (nlh->nlmsg_flags & NLM_F_DUMP))) {
505 struct crypto_alg *alg;
506 u16 dump_alloc = 0;
508 if (link->dump == NULL)
509 return -EINVAL;
511 down_read(&crypto_alg_sem);
512 list_for_each_entry(alg, &crypto_alg_list, cra_list)
513 dump_alloc += CRYPTO_REPORT_MAXSIZE;
516 struct netlink_dump_control c = {
517 .dump = link->dump,
518 .done = link->done,
519 .min_dump_alloc = dump_alloc,
521 err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
523 up_read(&crypto_alg_sem);
525 return err;
528 err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
529 crypto_policy, extack);
530 if (err < 0)
531 return err;
533 if (link->doit == NULL)
534 return -EINVAL;
536 return link->doit(skb, nlh, attrs);
539 static void crypto_netlink_rcv(struct sk_buff *skb)
541 mutex_lock(&crypto_cfg_mutex);
542 netlink_rcv_skb(skb, &crypto_user_rcv_msg);
543 mutex_unlock(&crypto_cfg_mutex);
546 static int __init crypto_user_init(void)
548 struct netlink_kernel_cfg cfg = {
549 .input = crypto_netlink_rcv,
552 crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
553 if (!crypto_nlsk)
554 return -ENOMEM;
556 return 0;
559 static void __exit crypto_user_exit(void)
561 netlink_kernel_release(crypto_nlsk);
564 module_init(crypto_user_init);
565 module_exit(crypto_user_exit);
566 MODULE_LICENSE("GPL");
567 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
568 MODULE_DESCRIPTION("Crypto userspace configuration API");
569 MODULE_ALIAS("net-pf-16-proto-21");