[mirror_ubuntu-bionic-kernel.git] / crypto / crypto_user.c

/*
 * Crypto user configuration API.
 *
 * Copyright (C) 2011 secunet Security Networks AG
 * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>
#include <linux/security.h>
#include <net/net_namespace.h>
#include "internal.h"

DEFINE_MUTEX(crypto_cfg_mutex);

/* The crypto netlink socket */
static struct sock *crypto_nlsk;

struct crypto_dump_info {
	struct sk_buff *in_skb;
	struct sk_buff *out_skb;
	u32 nlmsg_seq;
	u16 nlmsg_flags;
};

static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact)
{
	int match;
	struct crypto_alg *q, *alg = NULL;

	down_read(&crypto_alg_sem);

	if (list_empty(&crypto_alg_list))
		return NULL;

	list_for_each_entry(q, &crypto_alg_list, cra_list) {

		if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
			continue;

		if (strlen(p->cru_driver_name))
			match = !strcmp(q->cra_driver_name,
					p->cru_driver_name);
		else if (!exact)
			match = !strcmp(q->cra_name, p->cru_name);

		if (match) {
			alg = q;
			break;
		}
	}

	up_read(&crypto_alg_sem);

	return alg;
}

static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_cipher rcipher;

	snprintf(rcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "cipher");

	rcipher.blocksize = alg->cra_blocksize;
	rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
	rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;

	NLA_PUT(skb, CRYPTOCFGA_REPORT_CIPHER,
		sizeof(struct crypto_report_cipher), &rcipher);

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_one(struct crypto_alg *alg,
			     struct crypto_user_alg *ualg, struct sk_buff *skb)
{
	memcpy(&ualg->cru_name, &alg->cra_name, sizeof(ualg->cru_name));
	memcpy(&ualg->cru_driver_name, &alg->cra_driver_name,
	       sizeof(ualg->cru_driver_name));
	memcpy(&ualg->cru_module_name, module_name(alg->cra_module),
	       CRYPTO_MAX_ALG_NAME);

	ualg->cru_flags = alg->cra_flags;
	ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);

	NLA_PUT_U32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority);

	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
		struct crypto_report_larval rl;

		snprintf(rl.type, CRYPTO_MAX_ALG_NAME, "%s", "larval");

		NLA_PUT(skb, CRYPTOCFGA_REPORT_LARVAL,
			sizeof(struct crypto_report_larval), &rl);

		goto out;
	}

	if (alg->cra_type && alg->cra_type->report) {
		if (alg->cra_type->report(skb, alg))
			goto nla_put_failure;

		goto out;
	}

	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
	case CRYPTO_ALG_TYPE_CIPHER:
		if (crypto_report_cipher(skb, alg))
			goto nla_put_failure;

		break;
	}

out:
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_alg(struct crypto_alg *alg,
			     struct crypto_dump_info *info)
{
	struct sk_buff *in_skb = info->in_skb;
	struct sk_buff *skb = info->out_skb;
	struct nlmsghdr *nlh;
	struct crypto_user_alg *ualg;
	int err = 0;

	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, info->nlmsg_seq,
			CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
	if (!nlh) {
		err = -EMSGSIZE;
		goto out;
	}

	ualg = nlmsg_data(nlh);

	err = crypto_report_one(alg, ualg, skb);
	if (err) {
		nlmsg_cancel(skb, nlh);
		goto out;
	}

	nlmsg_end(skb, nlh);

out:
	return err;
}

static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
			 struct nlattr **attrs)
{
	struct crypto_user_alg *p = nlmsg_data(in_nlh);
	struct crypto_alg *alg;
	struct sk_buff *skb;
	struct crypto_dump_info info;
	int err;

	if (!p->cru_driver_name)
		return -EINVAL;

	alg = crypto_alg_match(p, 1);
	if (!alg)
		return -ENOENT;

	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
	if (!skb)
		return -ENOMEM;

	info.in_skb = in_skb;
	info.out_skb = skb;
	info.nlmsg_seq = in_nlh->nlmsg_seq;
	info.nlmsg_flags = 0;

	err = crypto_report_alg(alg, &info);
	if (err)
		return err;

	return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).pid);
}

static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct crypto_alg *alg;
	struct crypto_dump_info info;
	int err;

	if (cb->args[0])
		goto out;

	cb->args[0] = 1;

	info.in_skb = cb->skb;
	info.out_skb = skb;
	info.nlmsg_seq = cb->nlh->nlmsg_seq;
	info.nlmsg_flags = NLM_F_MULTI;

	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
		err = crypto_report_alg(alg, &info);
		if (err)
			goto out_err;
	}

out:
	return skb->len;
out_err:
	return err;
}

static int crypto_dump_report_done(struct netlink_callback *cb)
{
	return 0;
}

static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
			     struct nlattr **attrs)
{
	struct crypto_alg *alg;
	struct crypto_user_alg *p = nlmsg_data(nlh);
	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	LIST_HEAD(list);

	if (priority && !strlen(p->cru_driver_name))
		return -EINVAL;

	alg = crypto_alg_match(p, 1);
	if (!alg)
		return -ENOENT;

	down_write(&crypto_alg_sem);

	crypto_remove_spawns(alg, &list, NULL);

	if (priority)
		alg->cra_priority = nla_get_u32(priority);

	up_write(&crypto_alg_sem);

	crypto_remove_final(&list);

	return 0;
}

static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
			  struct nlattr **attrs)
{
	struct crypto_alg *alg;
	struct crypto_user_alg *p = nlmsg_data(nlh);

	alg = crypto_alg_match(p, 1);
	if (!alg)
		return -ENOENT;

	/* We can not unregister core algorithms such as aes-generic.
	 * We would loose the reference in the crypto_alg_list to this algorithm
	 * if we try to unregister. Unregistering such an algorithm without
	 * removing the module is not possible, so we restrict to crypto
	 * instances that are build from templates. */
	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
		return -EINVAL;

	if (atomic_read(&alg->cra_refcnt) != 1)
		return -EBUSY;

	return crypto_unregister_alg(alg);
}

static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
			  struct nlattr **attrs)
{
	int exact;
	const char *name;
	struct crypto_alg *alg;
	struct crypto_user_alg *p = nlmsg_data(nlh);
	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];

	if (strlen(p->cru_driver_name))
		exact = 1;

	if (priority && !exact)
		return -EINVAL;

	alg = crypto_alg_match(p, exact);
	if (alg)
		return -EEXIST;

	if (strlen(p->cru_driver_name))
		name = p->cru_driver_name;
	else
		name = p->cru_name;

	alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
	if (IS_ERR(alg))
		return PTR_ERR(alg);

	down_write(&crypto_alg_sem);

	if (priority)
		alg->cra_priority = nla_get_u32(priority);

	up_write(&crypto_alg_sem);

	crypto_mod_put(alg);

	return 0;
}

#define MSGSIZE(type) sizeof(struct type)

static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
	[CRYPTO_MSG_NEWALG	- CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	[CRYPTO_MSG_DELALG	- CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	[CRYPTO_MSG_UPDATEALG	- CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	[CRYPTO_MSG_GETALG	- CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
};

static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
	[CRYPTOCFGA_PRIORITY_VAL]   = { .type = NLA_U32},
};

#undef MSGSIZE

static struct crypto_link {
	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
	int (*dump)(struct sk_buff *, struct netlink_callback *);
	int (*done)(struct netlink_callback *);
} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
	[CRYPTO_MSG_NEWALG	- CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
	[CRYPTO_MSG_DELALG	- CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
	[CRYPTO_MSG_UPDATEALG	- CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
	[CRYPTO_MSG_GETALG	- CRYPTO_MSG_BASE] = { .doit = crypto_report,
						       .dump = crypto_dump_report,
						       .done = crypto_dump_report_done},
};

static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
	struct crypto_link *link;
	int type, err;

	type = nlh->nlmsg_type;
	if (type > CRYPTO_MSG_MAX)
		return -EINVAL;

	type -= CRYPTO_MSG_BASE;
	link = &crypto_dispatch[type];

	if (security_netlink_recv(skb, CAP_NET_ADMIN))
		return -EPERM;

	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
	    (nlh->nlmsg_flags & NLM_F_DUMP))) {
		if (link->dump == NULL)
			return -EINVAL;

		return netlink_dump_start(crypto_nlsk, skb, nlh,
					  link->dump, link->done, 0);
	}

	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
			  crypto_policy);
	if (err < 0)
		return err;

	if (link->doit == NULL)
		return -EINVAL;

	return link->doit(skb, nlh, attrs);
}

static void crypto_netlink_rcv(struct sk_buff *skb)
{
	mutex_lock(&crypto_cfg_mutex);
	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
	mutex_unlock(&crypto_cfg_mutex);
}

static int __init crypto_user_init(void)
{
	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO,
					    0, crypto_netlink_rcv,
					    NULL, THIS_MODULE);
	if (!crypto_nlsk)
		return -ENOMEM;

	return 0;
}

static void __exit crypto_user_exit(void)
{
	netlink_kernel_release(crypto_nlsk);
}

module_init(crypto_user_init);
module_exit(crypto_user_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
MODULE_DESCRIPTION("Crypto userspace configuration API");
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>
	24	#include <net/netlink.h>
	25	#include <linux/security.h>
	26	#include <net/net_namespace.h>
	27	#include "internal.h"
	28
	29	DEFINE_MUTEX(crypto_cfg_mutex);
	30
	31	/* The crypto netlink socket */
	32	static struct sock *crypto_nlsk;
	33
	34	struct crypto_dump_info {
	35	struct sk_buff *in_skb;
	36	struct sk_buff *out_skb;
	37	u32 nlmsg_seq;
	38	u16 nlmsg_flags;
	39	};
	40
	41	static struct crypto_alg crypto_alg_match(struct crypto_user_alg p, int exact)
	42	{
	43	int match;
	44	struct crypto_alg q, alg = NULL;
	45
	46	down_read(&crypto_alg_sem);
	47
	48	if (list_empty(&crypto_alg_list))
	49	return NULL;
	50
	51	list_for_each_entry(q, &crypto_alg_list, cra_list) {
	52
	53	if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
	54	continue;
	55
	56	if (strlen(p->cru_driver_name))
	57	match = !strcmp(q->cra_driver_name,
	58	p->cru_driver_name);
	59	else if (!exact)
	60	match = !strcmp(q->cra_name, p->cru_name);
	61
	62	if (match) {
	63	alg = q;
	64	break;
65	}
66	}
67
68	up_read(&crypto_alg_sem);
69
70	return alg;
71	}
72
07a5fa4a SK	73	static int crypto_report_cipher(struct sk_buff skb, struct crypto_alg alg)
	74	{
	75	struct crypto_report_cipher rcipher;
	76
	77	snprintf(rcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "cipher");
	78
	79	rcipher.blocksize = alg->cra_blocksize;
	80	rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
	81	rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
	82
	83	NLA_PUT(skb, CRYPTOCFGA_REPORT_CIPHER,
	84	sizeof(struct crypto_report_cipher), &rcipher);
	85
	86	return 0;
	87
	88	nla_put_failure:
	89	return -EMSGSIZE;
	90	}
	91
a38f7907 SK	92	static int crypto_report_one(struct crypto_alg *alg,
	93	struct crypto_user_alg ualg, struct sk_buff skb)
	94	{
	95	memcpy(&ualg->cru_name, &alg->cra_name, sizeof(ualg->cru_name));
	96	memcpy(&ualg->cru_driver_name, &alg->cra_driver_name,
	97	sizeof(ualg->cru_driver_name));
	98	memcpy(&ualg->cru_module_name, module_name(alg->cra_module),
	99	CRYPTO_MAX_ALG_NAME);
	100
	101	ualg->cru_flags = alg->cra_flags;
	102	ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
	103
	104	NLA_PUT_U32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority);
	105
6c5a86f5 SK	106	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
	107	struct crypto_report_larval rl;
	108
	109	snprintf(rl.type, CRYPTO_MAX_ALG_NAME, "%s", "larval");
	110
	111	NLA_PUT(skb, CRYPTOCFGA_REPORT_LARVAL,
	112	sizeof(struct crypto_report_larval), &rl);
	113
	114	goto out;
	115	}
	116
b6aa63c0 SK	117	if (alg->cra_type && alg->cra_type->report) {
	118	if (alg->cra_type->report(skb, alg))
	119	goto nla_put_failure;
07a5fa4a SK	120
	121	goto out;
	122	}
	123
	124	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_LARVAL)) {
	125	case CRYPTO_ALG_TYPE_CIPHER:
	126	if (crypto_report_cipher(skb, alg))
	127	goto nla_put_failure;
	128
	129	break;
b6aa63c0 SK	130	}
b6aa63c0 SK	131
6c5a86f5	132	out:
a38f7907 SK	133	return 0;
	134
	135	nla_put_failure:
	136	return -EMSGSIZE;
	137	}
	138
	139	static int crypto_report_alg(struct crypto_alg *alg,
	140	struct crypto_dump_info *info)
	141	{
	142	struct sk_buff *in_skb = info->in_skb;
	143	struct sk_buff *skb = info->out_skb;
	144	struct nlmsghdr *nlh;
	145	struct crypto_user_alg *ualg;
	146	int err = 0;
	147
	148	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, info->nlmsg_seq,
	149	CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
	150	if (!nlh) {
	151	err = -EMSGSIZE;
	152	goto out;
	153	}
	154
	155	ualg = nlmsg_data(nlh);
	156
	157	err = crypto_report_one(alg, ualg, skb);
	158	if (err) {
	159	nlmsg_cancel(skb, nlh);
	160	goto out;
	161	}
	162
	163	nlmsg_end(skb, nlh);
	164
	165	out:
	166	return err;
	167	}
	168
	169	static int crypto_report(struct sk_buff in_skb, struct nlmsghdr in_nlh,
	170	struct nlattr **attrs)
	171	{
	172	struct crypto_user_alg *p = nlmsg_data(in_nlh);
	173	struct crypto_alg *alg;
	174	struct sk_buff *skb;
	175	struct crypto_dump_info info;
	176	int err;
	177
	178	if (!p->cru_driver_name)
	179	return -EINVAL;
	180
	181	alg = crypto_alg_match(p, 1);
	182	if (!alg)
	183	return -ENOENT;
	184
	185	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
	186	if (!skb)
	187	return -ENOMEM;
	188
	189	info.in_skb = in_skb;
	190	info.out_skb = skb;
	191	info.nlmsg_seq = in_nlh->nlmsg_seq;
	192	info.nlmsg_flags = 0;
	193
	194	err = crypto_report_alg(alg, &info);
	195	if (err)
	196	return err;
197
198	return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).pid);
199	}
200
201	static int crypto_dump_report(struct sk_buff skb, struct netlink_callback cb)
202	{
203	struct crypto_alg *alg;
204	struct crypto_dump_info info;
205	int err;
206
207	if (cb->args[0])
208	goto out;
209
210	cb->args[0] = 1;
211
212	info.in_skb = cb->skb;
213	info.out_skb = skb;
214	info.nlmsg_seq = cb->nlh->nlmsg_seq;
215	info.nlmsg_flags = NLM_F_MULTI;
216
217	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
218	err = crypto_report_alg(alg, &info);
219	if (err)
220	goto out_err;
221	}
222
223	out:
224	return skb->len;
225	out_err:
226	return err;
227	}
228
229	static int crypto_dump_report_done(struct netlink_callback *cb)
230	{
231	return 0;
232	}
233
234	static int crypto_update_alg(struct sk_buff skb, struct nlmsghdr nlh,
235	struct nlattr **attrs)
236	{
237	struct crypto_alg *alg;
238	struct crypto_user_alg *p = nlmsg_data(nlh);
239	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
240	LIST_HEAD(list);
241
242	if (priority && !strlen(p->cru_driver_name))
243	return -EINVAL;
244
245	alg = crypto_alg_match(p, 1);
246	if (!alg)
247	return -ENOENT;
248
249	down_write(&crypto_alg_sem);
250
251	crypto_remove_spawns(alg, &list, NULL);
252
253	if (priority)
254	alg->cra_priority = nla_get_u32(priority);
255
256	up_write(&crypto_alg_sem);
257
258	crypto_remove_final(&list);
259
260	return 0;
261	}
262
263	static int crypto_del_alg(struct sk_buff skb, struct nlmsghdr nlh,
264	struct nlattr **attrs)
265	{
266	struct crypto_alg *alg;
267	struct crypto_user_alg *p = nlmsg_data(nlh);
268
269	alg = crypto_alg_match(p, 1);
270	if (!alg)
271	return -ENOENT;
272
273	/* We can not unregister core algorithms such as aes-generic.
274	* We would loose the reference in the crypto_alg_list to this algorithm
275	* if we try to unregister. Unregistering such an algorithm without
276	* removing the module is not possible, so we restrict to crypto
277	* instances that are build from templates. */
278	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
279	return -EINVAL;
280
281	if (atomic_read(&alg->cra_refcnt) != 1)
282	return -EBUSY;
283
284	return crypto_unregister_alg(alg);
285	}
286
287	static int crypto_add_alg(struct sk_buff skb, struct nlmsghdr nlh,
288	struct nlattr **attrs)
289	{
290	int exact;
291	const char *name;
292	struct crypto_alg *alg;
293	struct crypto_user_alg *p = nlmsg_data(nlh);
294	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
295
296	if (strlen(p->cru_driver_name))
297	exact = 1;
298
299	if (priority && !exact)
300	return -EINVAL;
301
302	alg = crypto_alg_match(p, exact);
303	if (alg)
304	return -EEXIST;
305
306	if (strlen(p->cru_driver_name))
307	name = p->cru_driver_name;
308	else
309	name = p->cru_name;
310
311	alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
312	if (IS_ERR(alg))
313	return PTR_ERR(alg);
314
315	down_write(&crypto_alg_sem);
316
317	if (priority)
318	alg->cra_priority = nla_get_u32(priority);
319
320	up_write(&crypto_alg_sem);
321
322	crypto_mod_put(alg);
323
324	return 0;
325	}
326
327	#define MSGSIZE(type) sizeof(struct type)
328
329	static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
330	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
331	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
332	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
333	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
334	};
335
336	static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
337	[CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
338	};
339
340	#undef MSGSIZE
341
342	static struct crypto_link {
343	int (doit)(struct sk_buff , struct nlmsghdr , struct nlattr *);
344	int (dump)(struct sk_buff , struct netlink_callback *);
345	int (done)(struct netlink_callback );
346	} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
347	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
348	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
349	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
350	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
351	.dump = crypto_dump_report,
352	.done = crypto_dump_report_done},
353	};
354
355	static int crypto_user_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
356	{
357	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
358	struct crypto_link *link;
359	int type, err;
360
361	type = nlh->nlmsg_type;
362	if (type > CRYPTO_MSG_MAX)
363	return -EINVAL;
364
365	type -= CRYPTO_MSG_BASE;
366	link = &crypto_dispatch[type];
367
368	if (security_netlink_recv(skb, CAP_NET_ADMIN))
369	return -EPERM;
370
371	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
372	(nlh->nlmsg_flags & NLM_F_DUMP))) {
373	if (link->dump == NULL)
374	return -EINVAL;
375
376	return netlink_dump_start(crypto_nlsk, skb, nlh,
377	link->dump, link->done, 0);
378	}
379
380	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
381	crypto_policy);
382	if (err < 0)
383	return err;
384
385	if (link->doit == NULL)
386	return -EINVAL;
387
388	return link->doit(skb, nlh, attrs);
389	}
390
391	static void crypto_netlink_rcv(struct sk_buff *skb)
392	{
393	mutex_lock(&crypto_cfg_mutex);
394	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
395	mutex_unlock(&crypto_cfg_mutex);
396	}
397
398	static int __init crypto_user_init(void)
399	{
400	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO,
401	0, crypto_netlink_rcv,
402	NULL, THIS_MODULE);
403	if (!crypto_nlsk)
404	return -ENOMEM;
405
406	return 0;
407	}
408
409	static void __exit crypto_user_exit(void)
410	{
411	netlink_kernel_release(crypto_nlsk);
412	}
413
414	module_init(crypto_user_init);
415	module_exit(crypto_user_exit);
416	MODULE_LICENSE("GPL");
417	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
418	MODULE_DESCRIPTION("Crypto userspace configuration API");