[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 <linux/sched.h>
#include <net/netlink.h>
#include <linux/security.h>
#include <net/net_namespace.h>
#include <crypto/internal/skcipher.h>
#include <crypto/internal/rng.h>
#include <crypto/akcipher.h>
#include <crypto/kpp.h>

#include "internal.h"

#define null_terminated(x)	(strnlen(x, sizeof(x)) < sizeof(x))

static 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)
{
	struct crypto_alg *q, *alg = NULL;

	down_read(&crypto_alg_sem);

	list_for_each_entry(q, &crypto_alg_list, cra_list) {
		int match = 0;

		if (crypto_is_larval(q))
			continue;

		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)
			continue;

		if (unlikely(!crypto_mod_get(q)))
			continue;

		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;

	strncpy(rcipher.type, "cipher", sizeof(rcipher.type));

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

	if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
		    sizeof(struct crypto_report_cipher), &rcipher))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_comp rcomp;

	strncpy(rcomp.type, "compression", sizeof(rcomp.type));
	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
		    sizeof(struct crypto_report_comp), &rcomp))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_acomp(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_acomp racomp;

	strncpy(racomp.type, "acomp", sizeof(racomp.type));

	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
		    sizeof(struct crypto_report_acomp), &racomp))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_akcipher rakcipher;

	strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));

	if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
		    sizeof(struct crypto_report_akcipher), &rakcipher))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_report_kpp(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_kpp rkpp;

	strncpy(rkpp.type, "kpp", sizeof(rkpp.type));

	if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
		    sizeof(struct crypto_report_kpp), &rkpp))
		goto nla_put_failure;
	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)
{
	strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
	strncpy(ualg->cru_driver_name, alg->cra_driver_name,
		sizeof(ualg->cru_driver_name));
	strncpy(ualg->cru_module_name, module_name(alg->cra_module),
		sizeof(ualg->cru_module_name));

	ualg->cru_type = 0;
	ualg->cru_mask = 0;
	ualg->cru_flags = alg->cra_flags;
	ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);

	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
		goto nla_put_failure;
	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
		struct crypto_report_larval rl;

		strncpy(rl.type, "larval", sizeof(rl.type));
		if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
			    sizeof(struct crypto_report_larval), &rl))
			goto nla_put_failure;
		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;
	case CRYPTO_ALG_TYPE_COMPRESS:
		if (crypto_report_comp(skb, alg))
			goto nla_put_failure;

		break;
	case CRYPTO_ALG_TYPE_ACOMPRESS:
		if (crypto_report_acomp(skb, alg))
			goto nla_put_failure;

		break;
	case CRYPTO_ALG_TYPE_AKCIPHER:
		if (crypto_report_akcipher(skb, alg))
			goto nla_put_failure;

		break;
	case CRYPTO_ALG_TYPE_KPP:
		if (crypto_report_kpp(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).portid, 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 (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
		return -EINVAL;

	alg = crypto_alg_match(p, 0);
	if (!alg)
		return -ENOENT;

	err = -ENOMEM;
	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
	if (!skb)
		goto drop_alg;

	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);

drop_alg:
	crypto_mod_put(alg);

	if (err) {
		kfree_skb(skb);
		return err;
	}

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

static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
{
	const size_t start_pos = cb->args[0];
	size_t pos = 0;
	struct crypto_dump_info info;
	struct crypto_alg *alg;
	int res;

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

	down_read(&crypto_alg_sem);
	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
		if (pos >= start_pos) {
			res = crypto_report_alg(alg, &info);
			if (res == -EMSGSIZE)
				break;
			if (res)
				goto out;
		}
		pos++;
	}
	cb->args[0] = pos;
	res = skb->len;
out:
	up_read(&crypto_alg_sem);
	return res;
}

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 (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;

	if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
		return -EINVAL;

	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_mod_put(alg);
	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);
	int err;

	if (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;

	if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
		return -EINVAL;

	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. */
	err = -EINVAL;
	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
		goto drop_alg;

	err = -EBUSY;
	if (atomic_read(&alg->cra_refcnt) > 2)
		goto drop_alg;

	err = crypto_unregister_instance((struct crypto_instance *)alg);

drop_alg:
	crypto_mod_put(alg);
	return err;
}

static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
			  struct nlattr **attrs)
{
	int exact = 0;
	const char *name;
	struct crypto_alg *alg;
	struct crypto_user_alg *p = nlmsg_data(nlh);
	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];

	if (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;

	if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
		return -EINVAL;

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

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

	alg = crypto_alg_match(p, exact);
	if (alg) {
		crypto_mod_put(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;
}

static int crypto_del_rng(struct sk_buff *skb, struct nlmsghdr *nlh,
			  struct nlattr **attrs)
{
	if (!netlink_capable(skb, CAP_NET_ADMIN))
		return -EPERM;
	return crypto_del_default_rng();
}

#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),
	[CRYPTO_MSG_DELRNG	- CRYPTO_MSG_BASE] = 0,
};

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

#undef MSGSIZE

static const 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},
	[CRYPTO_MSG_DELRNG	- CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
};

static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
			       struct netlink_ext_ack *extack)
{
	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
	const 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 ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
	    (nlh->nlmsg_flags & NLM_F_DUMP))) {
		struct crypto_alg *alg;
		unsigned long dump_alloc = 0;

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

		down_read(&crypto_alg_sem);
		list_for_each_entry(alg, &crypto_alg_list, cra_list)
			dump_alloc += CRYPTO_REPORT_MAXSIZE;
		up_read(&crypto_alg_sem);

		{
			struct netlink_dump_control c = {
				.dump = link->dump,
				.done = link->done,
				.min_dump_alloc = min(dump_alloc, 65535UL),
			};
			err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
		}

		return err;
	}

	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
			  crypto_policy, extack);
	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)
{
	struct netlink_kernel_cfg cfg = {
		.input	= crypto_netlink_rcv,
	};

	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
	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");
MODULE_ALIAS("net-pf-16-proto-21");
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	28	#include <crypto/internal/skcipher.h>
9aa867e4	29	#include <crypto/internal/rng.h>
3c339ab8	30	#include <crypto/akcipher.h>
4e5f2c40	31	#include <crypto/kpp.h>
1e122994	32
a38f7907 SK	33	#include "internal.h"
a38f7907 SK	34
8fd61d34 MK	35	#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
8fd61d34 MK	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	57
fe418b99 EB	58	if (crypto_is_larval(q))
	59	continue;
	60
a38f7907 SK	61	if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
	62	continue;
	63
	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);
	69
016baaa1 HX	70	if (!match)
	71	continue;
	72
	73	if (unlikely(!crypto_mod_get(q)))
	74	continue;
	75
	76	alg = q;
	77	break;
a38f7907 SK	78	}
	79
	80	up_read(&crypto_alg_sem);
	81
	82	return alg;
	83	}
	84
07a5fa4a SK	85	static int crypto_report_cipher(struct sk_buff skb, struct crypto_alg alg)
	86	{
	87	struct crypto_report_cipher rcipher;
	88
c807ef3b	89	strncpy(rcipher.type, "cipher", sizeof(rcipher.type));
07a5fa4a SK	90
	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;
	94
6662df33 DM	95	if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
	96	sizeof(struct crypto_report_cipher), &rcipher))
	97	goto nla_put_failure;
07a5fa4a SK	98	return 0;
	99
	100	nla_put_failure:
	101	return -EMSGSIZE;
	102	}
	103
540b97c1 SK	104	static int crypto_report_comp(struct sk_buff skb, struct crypto_alg alg)
	105	{
	106	struct crypto_report_comp rcomp;
	107
c807ef3b	108	strncpy(rcomp.type, "compression", sizeof(rcomp.type));
6662df33 DM	109	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
	110	sizeof(struct crypto_report_comp), &rcomp))
	111	goto nla_put_failure;
540b97c1 SK	112	return 0;
	113
	114	nla_put_failure:
	115	return -EMSGSIZE;
	116	}
	117
2ebda74f GC	118	static int crypto_report_acomp(struct sk_buff skb, struct crypto_alg alg)
	119	{
	120	struct crypto_report_acomp racomp;
	121
c807ef3b	122	strncpy(racomp.type, "acomp", sizeof(racomp.type));
2ebda74f GC	123
	124	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
	125	sizeof(struct crypto_report_acomp), &racomp))
	126	goto nla_put_failure;
	127	return 0;
	128
	129	nla_put_failure:
	130	return -EMSGSIZE;
	131	}
	132
3c339ab8 TS	133	static int crypto_report_akcipher(struct sk_buff skb, struct crypto_alg alg)
	134	{
	135	struct crypto_report_akcipher rakcipher;
	136
c807ef3b	137	strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
3c339ab8 TS	138
	139	if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
	140	sizeof(struct crypto_report_akcipher), &rakcipher))
	141	goto nla_put_failure;
	142	return 0;
	143
	144	nla_put_failure:
	145	return -EMSGSIZE;
	146	}
	147
4e5f2c40 SB	148	static int crypto_report_kpp(struct sk_buff skb, struct crypto_alg alg)
	149	{
	150	struct crypto_report_kpp rkpp;
	151
c807ef3b	152	strncpy(rkpp.type, "kpp", sizeof(rkpp.type));
4e5f2c40 SB	153
	154	if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
	155	sizeof(struct crypto_report_kpp), &rkpp))
	156	goto nla_put_failure;
	157	return 0;
	158
	159	nla_put_failure:
	160	return -EMSGSIZE;
	161	}
	162
a38f7907 SK	163	static int crypto_report_one(struct crypto_alg *alg,
	164	struct crypto_user_alg ualg, struct sk_buff skb)
	165	{
c807ef3b EB	166	strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
c807ef3b EB	167	strncpy(ualg->cru_driver_name, alg->cra_driver_name,
9a5467bf	168	sizeof(ualg->cru_driver_name));
c807ef3b	169	strncpy(ualg->cru_module_name, module_name(alg->cra_module),
9a5467bf MK	170	sizeof(ualg->cru_module_name));
	171
	172	ualg->cru_type = 0;
	173	ualg->cru_mask = 0;
a38f7907 SK	174	ualg->cru_flags = alg->cra_flags;
	175	ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
	176
6662df33 DM	177	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
6662df33 DM	178	goto nla_put_failure;
6c5a86f5 SK	179	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
	180	struct crypto_report_larval rl;
	181
c807ef3b	182	strncpy(rl.type, "larval", sizeof(rl.type));
6662df33 DM	183	if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
	184	sizeof(struct crypto_report_larval), &rl))
	185	goto nla_put_failure;
6c5a86f5 SK	186	goto out;
	187	}
	188
b6aa63c0 SK	189	if (alg->cra_type && alg->cra_type->report) {
	190	if (alg->cra_type->report(skb, alg))
	191	goto nla_put_failure;
07a5fa4a SK	192
	193	goto out;
	194	}
	195
	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;
	200
540b97c1 SK	201	break;
	202	case CRYPTO_ALG_TYPE_COMPRESS:
	203	if (crypto_report_comp(skb, alg))
	204	goto nla_put_failure;
	205
07a5fa4a	206	break;
2ebda74f GC	207	case CRYPTO_ALG_TYPE_ACOMPRESS:
	208	if (crypto_report_acomp(skb, alg))
	209	goto nla_put_failure;
3c339ab8	210
2ebda74f	211	break;
3c339ab8 TS	212	case CRYPTO_ALG_TYPE_AKCIPHER:
	213	if (crypto_report_akcipher(skb, alg))
	214	goto nla_put_failure;
	215
	216	break;
4e5f2c40 SB	217	case CRYPTO_ALG_TYPE_KPP:
	218	if (crypto_report_kpp(skb, alg))
	219	goto nla_put_failure;
	220	break;
b6aa63c0 SK	221	}
b6aa63c0 SK	222
6c5a86f5	223	out:
a38f7907 SK	224	return 0;
	225
	226	nla_put_failure:
	227	return -EMSGSIZE;
	228	}
	229
	230	static int crypto_report_alg(struct crypto_alg *alg,
	231	struct crypto_dump_info *info)
	232	{
	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;
	238
15e47304	239	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
a38f7907 SK	240	CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
	241	if (!nlh) {
	242	err = -EMSGSIZE;
	243	goto out;
	244	}
	245
	246	ualg = nlmsg_data(nlh);
	247
	248	err = crypto_report_one(alg, ualg, skb);
	249	if (err) {
	250	nlmsg_cancel(skb, nlh);
	251	goto out;
	252	}
	253
	254	nlmsg_end(skb, nlh);
	255
	256	out:
	257	return err;
	258	}
	259
	260	static int crypto_report(struct sk_buff in_skb, struct nlmsghdr in_nlh,
	261	struct nlattr **attrs)
	262	{
	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;
	268
8fd61d34 MK	269	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	270	return -EINVAL;
	271
5d4a5e77	272	alg = crypto_alg_match(p, 0);
a38f7907 SK	273	if (!alg)
	274	return -ENOENT;
	275
016baaa1	276	err = -ENOMEM;
a38f7907 SK	277	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
a38f7907 SK	278	if (!skb)
016baaa1	279	goto drop_alg;
a38f7907 SK	280
	281	info.in_skb = in_skb;
	282	info.out_skb = skb;
	283	info.nlmsg_seq = in_nlh->nlmsg_seq;
	284	info.nlmsg_flags = 0;
	285
	286	err = crypto_report_alg(alg, &info);
016baaa1 HX	287
	288	drop_alg:
	289	crypto_mod_put(alg);
	290
54655c68 NE	291	if (err) {
54655c68 NE	292	kfree_skb(skb);
a38f7907	293	return err;
54655c68	294	}
a38f7907	295
15e47304	296	return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
a38f7907 SK	297	}
	298
	299	static int crypto_dump_report(struct sk_buff skb, struct netlink_callback cb)
	300	{
981a1b35 EB	301	const size_t start_pos = cb->args[0];
981a1b35 EB	302	size_t pos = 0;
a38f7907	303	struct crypto_dump_info info;
981a1b35 EB	304	struct crypto_alg *alg;
981a1b35 EB	305	int res;
a38f7907 SK	306
	307	info.in_skb = cb->skb;
	308	info.out_skb = skb;
	309	info.nlmsg_seq = cb->nlh->nlmsg_seq;
	310	info.nlmsg_flags = NLM_F_MULTI;
	311
981a1b35	312	down_read(&crypto_alg_sem);
a38f7907	313	list_for_each_entry(alg, &crypto_alg_list, cra_list) {
981a1b35 EB	314	if (pos >= start_pos) {
	315	res = crypto_report_alg(alg, &info);
	316	if (res == -EMSGSIZE)
	317	break;
	318	if (res)
	319	goto out;
	320	}
	321	pos++;
a38f7907	322	}
981a1b35 EB	323	cb->args[0] = pos;
981a1b35 EB	324	res = skb->len;
a38f7907	325	out:
981a1b35 EB	326	up_read(&crypto_alg_sem);
981a1b35 EB	327	return res;
a38f7907 SK	328	}
	329
	330	static int crypto_dump_report_done(struct netlink_callback *cb)
	331	{
	332	return 0;
	333	}
	334
	335	static int crypto_update_alg(struct sk_buff skb, struct nlmsghdr nlh,
	336	struct nlattr **attrs)
	337	{
	338	struct crypto_alg *alg;
	339	struct crypto_user_alg *p = nlmsg_data(nlh);
	340	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	341	LIST_HEAD(list);
	342
639b4ac6	343	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	344	return -EPERM;
c568398a MCO	345
8fd61d34 MK	346	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	347	return -EINVAL;
	348
a38f7907 SK	349	if (priority && !strlen(p->cru_driver_name))
	350	return -EINVAL;
	351
	352	alg = crypto_alg_match(p, 1);
	353	if (!alg)
	354	return -ENOENT;
	355
	356	down_write(&crypto_alg_sem);
	357
	358	crypto_remove_spawns(alg, &list, NULL);
	359
	360	if (priority)
	361	alg->cra_priority = nla_get_u32(priority);
	362
	363	up_write(&crypto_alg_sem);
	364
016baaa1	365	crypto_mod_put(alg);
a38f7907 SK	366	crypto_remove_final(&list);
	367
	368	return 0;
	369	}
	370
	371	static int crypto_del_alg(struct sk_buff skb, struct nlmsghdr nlh,
	372	struct nlattr **attrs)
	373	{
	374	struct crypto_alg *alg;
	375	struct crypto_user_alg *p = nlmsg_data(nlh);
016baaa1	376	int err;
a38f7907	377
639b4ac6	378	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	379	return -EPERM;
c568398a MCO	380
8fd61d34 MK	381	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	382	return -EINVAL;
	383
a38f7907 SK	384	alg = crypto_alg_match(p, 1);
	385	if (!alg)
	386	return -ENOENT;
	387
	388	/* We can not unregister core algorithms such as aes-generic.
	389	* We would loose the reference in the crypto_alg_list to this algorithm
	390	* if we try to unregister. Unregistering such an algorithm without
	391	* removing the module is not possible, so we restrict to crypto
	392	* instances that are build from templates. */
016baaa1	393	err = -EINVAL;
a38f7907	394	if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
016baaa1	395	goto drop_alg;
a38f7907	396
016baaa1 HX	397	err = -EBUSY;
	398	if (atomic_read(&alg->cra_refcnt) > 2)
	399	goto drop_alg;
a38f7907	400
016baaa1 HX	401	err = crypto_unregister_instance((struct crypto_instance *)alg);
	402
	403	drop_alg:
	404	crypto_mod_put(alg);
	405	return err;
a38f7907 SK	406	}
	407
	408	static int crypto_add_alg(struct sk_buff skb, struct nlmsghdr nlh,
	409	struct nlattr **attrs)
	410	{
0cfdec7a	411	int exact = 0;
a38f7907 SK	412	const char *name;
	413	struct crypto_alg *alg;
	414	struct crypto_user_alg *p = nlmsg_data(nlh);
	415	struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
	416
639b4ac6	417	if (!netlink_capable(skb, CAP_NET_ADMIN))
c568398a MCO	418	return -EPERM;
c568398a MCO	419
8fd61d34 MK	420	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	421	return -EINVAL;
	422
a38f7907 SK	423	if (strlen(p->cru_driver_name))
	424	exact = 1;
	425
	426	if (priority && !exact)
	427	return -EINVAL;
	428
	429	alg = crypto_alg_match(p, exact);
016baaa1 HX	430	if (alg) {
016baaa1 HX	431	crypto_mod_put(alg);
a38f7907	432	return -EEXIST;
016baaa1	433	}
a38f7907 SK	434
	435	if (strlen(p->cru_driver_name))
	436	name = p->cru_driver_name;
	437	else
	438	name = p->cru_name;
	439
6cf80a29	440	alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask);
a38f7907 SK	441	if (IS_ERR(alg))
	442	return PTR_ERR(alg);
	443
	444	down_write(&crypto_alg_sem);
	445
	446	if (priority)
	447	alg->cra_priority = nla_get_u32(priority);
	448
	449	up_write(&crypto_alg_sem);
	450
	451	crypto_mod_put(alg);
	452
	453	return 0;
	454	}
	455
9aa867e4 HX	456	static int crypto_del_rng(struct sk_buff skb, struct nlmsghdr nlh,
	457	struct nlattr **attrs)
	458	{
	459	if (!netlink_capable(skb, CAP_NET_ADMIN))
	460	return -EPERM;
	461	return crypto_del_default_rng();
	462	}
	463
a38f7907 SK	464	#define MSGSIZE(type) sizeof(struct type)
	465
	466	static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
	467	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	468	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
	469	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
055ddaac	470	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
9aa867e4	471	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
a38f7907 SK	472	};
	473
	474	static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
	475	[CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32},
	476	};
	477
	478	#undef MSGSIZE
	479
a84fb791	480	static const struct crypto_link {
a38f7907 SK	481	int (doit)(struct sk_buff , struct nlmsghdr , struct nlattr *);
	482	int (dump)(struct sk_buff , struct netlink_callback *);
	483	int (done)(struct netlink_callback );
	484	} crypto_dispatch[CRYPTO_NR_MSGTYPES] = {
	485	[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg},
	486	[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg},
	487	[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg},
	488	[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
	489	.dump = crypto_dump_report,
	490	.done = crypto_dump_report_done},
9aa867e4	491	[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
a38f7907 SK	492	};
a38f7907 SK	493
2d4bc933 JB	494	static int crypto_user_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh,
2d4bc933 JB	495	struct netlink_ext_ack *extack)
a38f7907 SK	496	{
a38f7907 SK	497	struct nlattr *attrs[CRYPTOCFGA_MAX+1];
a84fb791	498	const struct crypto_link *link;
a38f7907 SK	499	int type, err;
	500
	501	type = nlh->nlmsg_type;
	502	if (type > CRYPTO_MSG_MAX)
	503	return -EINVAL;
	504
	505	type -= CRYPTO_MSG_BASE;
	506	link = &crypto_dispatch[type];
	507
a38f7907 SK	508	if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
a38f7907 SK	509	(nlh->nlmsg_flags & NLM_F_DUMP))) {
5219a534	510	struct crypto_alg *alg;
981a1b35	511	unsigned long dump_alloc = 0;
5219a534	512
a38f7907 SK	513	if (link->dump == NULL)
a38f7907 SK	514	return -EINVAL;
5219a534	515
63e41ebc	516	down_read(&crypto_alg_sem);
5219a534 SK	517	list_for_each_entry(alg, &crypto_alg_list, cra_list)
5219a534 SK	518	dump_alloc += CRYPTO_REPORT_MAXSIZE;
981a1b35	519	up_read(&crypto_alg_sem);
5219a534	520
80d326fa PNA	521	{
	522	struct netlink_dump_control c = {
	523	.dump = link->dump,
	524	.done = link->done,
981a1b35	525	.min_dump_alloc = min(dump_alloc, 65535UL),
80d326fa	526	};
63e41ebc	527	err = netlink_dump_start(crypto_nlsk, skb, nlh, &c);
80d326fa	528	}
63e41ebc MK	529
63e41ebc MK	530	return err;
a38f7907 SK	531	}
a38f7907 SK	532
fd2efd93	533	err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
fe52145f	534	crypto_policy, extack);
fd2efd93 HX	535	if (err < 0)
fd2efd93 HX	536	return err;
a38f7907 SK	537
	538	if (link->doit == NULL)
	539	return -EINVAL;
	540
	541	return link->doit(skb, nlh, attrs);
	542	}
	543
	544	static void crypto_netlink_rcv(struct sk_buff *skb)
	545	{
	546	mutex_lock(&crypto_cfg_mutex);
	547	netlink_rcv_skb(skb, &crypto_user_rcv_msg);
	548	mutex_unlock(&crypto_cfg_mutex);
	549	}
	550
	551	static int __init crypto_user_init(void)
	552	{
a31f2d17 PNA	553	struct netlink_kernel_cfg cfg = {
	554	.input = crypto_netlink_rcv,
	555	};
	556
9f00d977	557	crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg);
a38f7907 SK	558	if (!crypto_nlsk)
	559	return -ENOMEM;
	560
	561	return 0;
	562	}
	563
	564	static void __exit crypto_user_exit(void)
	565	{
	566	netlink_kernel_release(crypto_nlsk);
	567	}
	568
	569	module_init(crypto_user_init);
	570	module_exit(crypto_user_exit);
	571	MODULE_LICENSE("GPL");
	572	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
	573	MODULE_DESCRIPTION("Crypto userspace configuration API");
476c7fe2	574	MODULE_ALIAS("net-pf-16-proto-21");