[thirdparty/kernel/linux.git] / crypto / crypto_user_stat.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Crypto user configuration API.
 *
 * Copyright (C) 2017-2018 Corentin Labbe <clabbe@baylibre.com>
 *
 */

#include <crypto/algapi.h>
#include <crypto/internal/cryptouser.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <net/netlink.h>
#include <net/sock.h>

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

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

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

	memset(&rcipher, 0, sizeof(rcipher));

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

	return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher);
}

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

	memset(&rcomp, 0, sizeof(rcomp));

	strscpy(rcomp.type, "compression", sizeof(rcomp.type));

	return nla_put(skb, CRYPTOCFGA_STAT_COMPRESS, sizeof(rcomp), &rcomp);
}

static int crypto_reportstat_one(struct crypto_alg *alg,
				 struct crypto_user_alg *ualg,
				 struct sk_buff *skb)
{
	memset(ualg, 0, sizeof(*ualg));

	strscpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
	strscpy(ualg->cru_driver_name, alg->cra_driver_name,
		sizeof(ualg->cru_driver_name));
	strscpy(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 = refcount_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_stat_larval rl;

		memset(&rl, 0, sizeof(rl));
		strscpy(rl.type, "larval", sizeof(rl.type));
		if (nla_put(skb, CRYPTOCFGA_STAT_LARVAL, sizeof(rl), &rl))
			goto nla_put_failure;
		goto out;
	}

	if (alg->cra_type && alg->cra_type->report_stat) {
		if (alg->cra_type->report_stat(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;
	default:
		pr_err("ERROR: Unhandled alg %d in %s\n",
		       alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL),
		       __func__);
	}

out:
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static int crypto_reportstat_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_GETSTAT, sizeof(*ualg), info->nlmsg_flags);
	if (!nlh) {
		err = -EMSGSIZE;
		goto out;
	}

	ualg = nlmsg_data(nlh);

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

	nlmsg_end(skb, nlh);

out:
	return err;
}

int crypto_reportstat(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
		      struct nlattr **attrs)
{
	struct net *net = sock_net(in_skb->sk);
	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_reportstat_alg(alg, &info);

drop_alg:
	crypto_mod_put(alg);

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

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

MODULE_LICENSE("GPL");
Commit	Line	Data
cac5818c CL	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Crypto user configuration API.
	4	*
	5	* Copyright (C) 2017-2018 Corentin Labbe <clabbe@baylibre.com>
	6	*
	7	*/
	8
9807e49b HX	9	#include <crypto/algapi.h>
	10	#include <crypto/internal/cryptouser.h>
	11	#include <linux/errno.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/string.h>
cac5818c	15	#include <net/netlink.h>
91b05a7e	16	#include <net/sock.h>
cac5818c CL	17
	18	#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
	19
cac5818c CL	20	struct crypto_dump_info {
	21	struct sk_buff *in_skb;
	22	struct sk_buff *out_skb;
	23	u32 nlmsg_seq;
	24	u16 nlmsg_flags;
	25	};
	26
cac5818c CL	27	static int crypto_report_cipher(struct sk_buff skb, struct crypto_alg alg)
cac5818c CL	28	{
7f0a9d5c	29	struct crypto_stat_cipher rcipher;
cac5818c	30
9f4debe3 CL	31	memset(&rcipher, 0, sizeof(rcipher));
9f4debe3 CL	32
37db69e0	33	strscpy(rcipher.type, "cipher", sizeof(rcipher.type));
cac5818c	34
37db69e0	35	return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher);
cac5818c CL	36	}
	37
	38	static int crypto_report_comp(struct sk_buff skb, struct crypto_alg alg)
	39	{
7f0a9d5c	40	struct crypto_stat_compress rcomp;
cac5818c	41
9f4debe3 CL	42	memset(&rcomp, 0, sizeof(rcomp));
9f4debe3 CL	43
37db69e0	44	strscpy(rcomp.type, "compression", sizeof(rcomp.type));
cac5818c	45
37db69e0	46	return nla_put(skb, CRYPTOCFGA_STAT_COMPRESS, sizeof(rcomp), &rcomp);
cac5818c CL	47	}
cac5818c CL	48
cac5818c CL	49	static int crypto_reportstat_one(struct crypto_alg *alg,
	50	struct crypto_user_alg *ualg,
	51	struct sk_buff *skb)
	52	{
9f4debe3 CL	53	memset(ualg, 0, sizeof(*ualg));
9f4debe3 CL	54
37db69e0 EB	55	strscpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
37db69e0 EB	56	strscpy(ualg->cru_driver_name, alg->cra_driver_name,
cac5818c	57	sizeof(ualg->cru_driver_name));
37db69e0	58	strscpy(ualg->cru_module_name, module_name(alg->cra_module),
cac5818c CL	59	sizeof(ualg->cru_module_name));
	60
	61	ualg->cru_type = 0;
	62	ualg->cru_mask = 0;
	63	ualg->cru_flags = alg->cra_flags;
	64	ualg->cru_refcnt = refcount_read(&alg->cra_refcnt);
	65
	66	if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
	67	goto nla_put_failure;
	68	if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
7f0a9d5c	69	struct crypto_stat_larval rl;
cac5818c	70
9f4debe3	71	memset(&rl, 0, sizeof(rl));
37db69e0 EB	72	strscpy(rl.type, "larval", sizeof(rl.type));
37db69e0 EB	73	if (nla_put(skb, CRYPTOCFGA_STAT_LARVAL, sizeof(rl), &rl))
cac5818c CL	74	goto nla_put_failure;
	75	goto out;
	76	}
	77
ed0733ea HX	78	if (alg->cra_type && alg->cra_type->report_stat) {
	79	if (alg->cra_type->report_stat(skb, alg))
	80	goto nla_put_failure;
	81	goto out;
	82	}
	83
cac5818c	84	switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_LARVAL)) {
cac5818c CL	85	case CRYPTO_ALG_TYPE_CIPHER:
	86	if (crypto_report_cipher(skb, alg))
	87	goto nla_put_failure;
	88	break;
	89	case CRYPTO_ALG_TYPE_COMPRESS:
	90	if (crypto_report_comp(skb, alg))
	91	goto nla_put_failure;
	92	break;
cac5818c CL	93	default:
	94	pr_err("ERROR: Unhandled alg %d in %s\n",
	95	alg->cra_flags & (CRYPTO_ALG_TYPE_MASK \| CRYPTO_ALG_LARVAL),
	96	__func__);
	97	}
	98
	99	out:
	100	return 0;
	101
	102	nla_put_failure:
	103	return -EMSGSIZE;
	104	}
	105
	106	static int crypto_reportstat_alg(struct crypto_alg *alg,
	107	struct crypto_dump_info *info)
	108	{
	109	struct sk_buff *in_skb = info->in_skb;
	110	struct sk_buff *skb = info->out_skb;
	111	struct nlmsghdr *nlh;
	112	struct crypto_user_alg *ualg;
	113	int err = 0;
	114
	115	nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
	116	CRYPTO_MSG_GETSTAT, sizeof(*ualg), info->nlmsg_flags);
	117	if (!nlh) {
	118	err = -EMSGSIZE;
	119	goto out;
	120	}
	121
	122	ualg = nlmsg_data(nlh);
	123
	124	err = crypto_reportstat_one(alg, ualg, skb);
	125	if (err) {
	126	nlmsg_cancel(skb, nlh);
	127	goto out;
	128	}
	129
	130	nlmsg_end(skb, nlh);
	131
	132	out:
	133	return err;
	134	}
	135
	136	int crypto_reportstat(struct sk_buff in_skb, struct nlmsghdr in_nlh,
	137	struct nlattr **attrs)
	138	{
91b05a7e	139	struct net *net = sock_net(in_skb->sk);
cac5818c CL	140	struct crypto_user_alg *p = nlmsg_data(in_nlh);
	141	struct crypto_alg *alg;
	142	struct sk_buff *skb;
	143	struct crypto_dump_info info;
	144	int err;
	145
	146	if (!null_terminated(p->cru_name) \|\| !null_terminated(p->cru_driver_name))
	147	return -EINVAL;
	148
	149	alg = crypto_alg_match(p, 0);
	150	if (!alg)
	151	return -ENOENT;
	152
	153	err = -ENOMEM;
	154	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
	155	if (!skb)
	156	goto drop_alg;
	157
	158	info.in_skb = in_skb;
	159	info.out_skb = skb;
	160	info.nlmsg_seq = in_nlh->nlmsg_seq;
	161	info.nlmsg_flags = 0;
	162
	163	err = crypto_reportstat_alg(alg, &info);
	164
	165	drop_alg:
	166	crypto_mod_put(alg);
	167
c03b04dc NE	168	if (err) {
c03b04dc NE	169	kfree_skb(skb);
cac5818c	170	return err;
c03b04dc	171	}
cac5818c	172
91b05a7e	173	return nlmsg_unicast(net->crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
cac5818c CL	174	}
cac5818c CL	175
cac5818c	176	MODULE_LICENSE("GPL");