[linux-block.git] / crypto / algif_hash.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * algif_hash: User-space interface for hash algorithms
 *
 * This file provides the user-space API for hash algorithms.
 *
 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <crypto/hash.h>
#include <crypto/if_alg.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/net.h>
#include <net/sock.h>

struct hash_ctx {
	struct af_alg_sgl sgl;

	u8 *result;

	struct crypto_wait wait;

	unsigned int len;
	bool more;

	struct ahash_request req;
};

static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
{
	unsigned ds;

	if (ctx->result)
		return 0;

	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));

	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
	if (!ctx->result)
		return -ENOMEM;

	memset(ctx->result, 0, ds);

	return 0;
}

static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
{
	unsigned ds;

	if (!ctx->result)
		return;

	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));

	sock_kzfree_s(sk, ctx->result, ds);
	ctx->result = NULL;
}

static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
			size_t ignored)
{
	int limit = ALG_MAX_PAGES * PAGE_SIZE;
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;
	long copied = 0;
	int err;

	if (limit > sk->sk_sndbuf)
		limit = sk->sk_sndbuf;

	lock_sock(sk);
	if (!ctx->more) {
		if ((msg->msg_flags & MSG_MORE))
			hash_free_result(sk, ctx);

		err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
		if (err)
			goto unlock;
	}

	ctx->more = false;

	while (msg_data_left(msg)) {
		int len = msg_data_left(msg);

		if (len > limit)
			len = limit;

		len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
		if (len < 0) {
			err = copied ? 0 : len;
			goto unlock;
		}

		ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);

		err = crypto_wait_req(crypto_ahash_update(&ctx->req),
				      &ctx->wait);
		af_alg_free_sg(&ctx->sgl);
		if (err) {
			iov_iter_revert(&msg->msg_iter, len);
			goto unlock;
		}

		copied += len;
	}

	err = 0;

	ctx->more = msg->msg_flags & MSG_MORE;
	if (!ctx->more) {
		err = hash_alloc_result(sk, ctx);
		if (err)
			goto unlock;

		ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
		err = crypto_wait_req(crypto_ahash_final(&ctx->req),
				      &ctx->wait);
	}

unlock:
	release_sock(sk);

	return err ?: copied;
}

static ssize_t hash_sendpage(struct socket *sock, struct page *page,
			     int offset, size_t size, int flags)
{
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;
	int err;

	if (flags & MSG_SENDPAGE_NOTLAST)
		flags |= MSG_MORE;

	lock_sock(sk);
	sg_init_table(ctx->sgl.sg, 1);
	sg_set_page(ctx->sgl.sg, page, size, offset);

	if (!(flags & MSG_MORE)) {
		err = hash_alloc_result(sk, ctx);
		if (err)
			goto unlock;
	} else if (!ctx->more)
		hash_free_result(sk, ctx);

	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);

	if (!(flags & MSG_MORE)) {
		if (ctx->more)
			err = crypto_ahash_finup(&ctx->req);
		else
			err = crypto_ahash_digest(&ctx->req);
	} else {
		if (!ctx->more) {
			err = crypto_ahash_init(&ctx->req);
			err = crypto_wait_req(err, &ctx->wait);
			if (err)
				goto unlock;
		}

		err = crypto_ahash_update(&ctx->req);
	}

	err = crypto_wait_req(err, &ctx->wait);
	if (err)
		goto unlock;

	ctx->more = flags & MSG_MORE;

unlock:
	release_sock(sk);

	return err ?: size;
}

static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
			int flags)
{
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;
	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	bool result;
	int err;

	if (len > ds)
		len = ds;
	else if (len < ds)
		msg->msg_flags |= MSG_TRUNC;

	lock_sock(sk);
	result = ctx->result;
	err = hash_alloc_result(sk, ctx);
	if (err)
		goto unlock;

	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);

	if (!result && !ctx->more) {
		err = crypto_wait_req(crypto_ahash_init(&ctx->req),
				      &ctx->wait);
		if (err)
			goto unlock;
	}

	if (!result || ctx->more) {
		ctx->more = false;
		err = crypto_wait_req(crypto_ahash_final(&ctx->req),
				      &ctx->wait);
		if (err)
			goto unlock;
	}

	err = memcpy_to_msg(msg, ctx->result, len);

unlock:
	hash_free_result(sk, ctx);
	release_sock(sk);

	return err ?: len;
}

static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
		       bool kern)
{
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;
	struct ahash_request *req = &ctx->req;
	struct crypto_ahash *tfm;
	struct sock *sk2;
	struct alg_sock *ask2;
	struct hash_ctx *ctx2;
	char *state;
	bool more;
	int err;

	tfm = crypto_ahash_reqtfm(req);
	state = kmalloc(crypto_ahash_statesize(tfm), GFP_KERNEL);
	err = -ENOMEM;
	if (!state)
		goto out;

	lock_sock(sk);
	more = ctx->more;
	err = more ? crypto_ahash_export(req, state) : 0;
	release_sock(sk);

	if (err)
		goto out_free_state;

	err = af_alg_accept(ask->parent, newsock, kern);
	if (err)
		goto out_free_state;

	sk2 = newsock->sk;
	ask2 = alg_sk(sk2);
	ctx2 = ask2->private;
	ctx2->more = more;

	if (!more)
		goto out_free_state;

	err = crypto_ahash_import(&ctx2->req, state);
	if (err) {
		sock_orphan(sk2);
		sock_put(sk2);
	}

out_free_state:
	kfree_sensitive(state);

out:
	return err;
}

static struct proto_ops algif_hash_ops = {
	.family		=	PF_ALG,

	.connect	=	sock_no_connect,
	.socketpair	=	sock_no_socketpair,
	.getname	=	sock_no_getname,
	.ioctl		=	sock_no_ioctl,
	.listen		=	sock_no_listen,
	.shutdown	=	sock_no_shutdown,
	.mmap		=	sock_no_mmap,
	.bind		=	sock_no_bind,

	.release	=	af_alg_release,
	.sendmsg	=	hash_sendmsg,
	.sendpage	=	hash_sendpage,
	.recvmsg	=	hash_recvmsg,
	.accept		=	hash_accept,
};

static int hash_check_key(struct socket *sock)
{
	int err = 0;
	struct sock *psk;
	struct alg_sock *pask;
	struct crypto_ahash *tfm;
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);

	lock_sock(sk);
	if (!atomic_read(&ask->nokey_refcnt))
		goto unlock_child;

	psk = ask->parent;
	pask = alg_sk(ask->parent);
	tfm = pask->private;

	err = -ENOKEY;
	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
		goto unlock;

	atomic_dec(&pask->nokey_refcnt);
	atomic_set(&ask->nokey_refcnt, 0);

	err = 0;

unlock:
	release_sock(psk);
unlock_child:
	release_sock(sk);

	return err;
}

static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
			      size_t size)
{
	int err;

	err = hash_check_key(sock);
	if (err)
		return err;

	return hash_sendmsg(sock, msg, size);
}

static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
				   int offset, size_t size, int flags)
{
	int err;

	err = hash_check_key(sock);
	if (err)
		return err;

	return hash_sendpage(sock, page, offset, size, flags);
}

static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
			      size_t ignored, int flags)
{
	int err;

	err = hash_check_key(sock);
	if (err)
		return err;

	return hash_recvmsg(sock, msg, ignored, flags);
}

static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
			     int flags, bool kern)
{
	int err;

	err = hash_check_key(sock);
	if (err)
		return err;

	return hash_accept(sock, newsock, flags, kern);
}

static struct proto_ops algif_hash_ops_nokey = {
	.family		=	PF_ALG,

	.connect	=	sock_no_connect,
	.socketpair	=	sock_no_socketpair,
	.getname	=	sock_no_getname,
	.ioctl		=	sock_no_ioctl,
	.listen		=	sock_no_listen,
	.shutdown	=	sock_no_shutdown,
	.mmap		=	sock_no_mmap,
	.bind		=	sock_no_bind,

	.release	=	af_alg_release,
	.sendmsg	=	hash_sendmsg_nokey,
	.sendpage	=	hash_sendpage_nokey,
	.recvmsg	=	hash_recvmsg_nokey,
	.accept		=	hash_accept_nokey,
};

static void *hash_bind(const char *name, u32 type, u32 mask)
{
	return crypto_alloc_ahash(name, type, mask);
}

static void hash_release(void *private)
{
	crypto_free_ahash(private);
}

static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
{
	return crypto_ahash_setkey(private, key, keylen);
}

static void hash_sock_destruct(struct sock *sk)
{
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;

	hash_free_result(sk, ctx);
	sock_kfree_s(sk, ctx, ctx->len);
	af_alg_release_parent(sk);
}

static int hash_accept_parent_nokey(void *private, struct sock *sk)
{
	struct crypto_ahash *tfm = private;
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx;
	unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);

	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	ctx->result = NULL;
	ctx->len = len;
	ctx->more = false;
	crypto_init_wait(&ctx->wait);

	ask->private = ctx;

	ahash_request_set_tfm(&ctx->req, tfm);
	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
				   crypto_req_done, &ctx->wait);

	sk->sk_destruct = hash_sock_destruct;

	return 0;
}

static int hash_accept_parent(void *private, struct sock *sk)
{
	struct crypto_ahash *tfm = private;

	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
		return -ENOKEY;

	return hash_accept_parent_nokey(private, sk);
}

static const struct af_alg_type algif_type_hash = {
	.bind		=	hash_bind,
	.release	=	hash_release,
	.setkey		=	hash_setkey,
	.accept		=	hash_accept_parent,
	.accept_nokey	=	hash_accept_parent_nokey,
	.ops		=	&algif_hash_ops,
	.ops_nokey	=	&algif_hash_ops_nokey,
	.name		=	"hash",
	.owner		=	THIS_MODULE
};

static int __init algif_hash_init(void)
{
	return af_alg_register_type(&algif_type_hash);
}

static void __exit algif_hash_exit(void)
{
	int err = af_alg_unregister_type(&algif_type_hash);
	BUG_ON(err);
}

module_init(algif_hash_init);
module_exit(algif_hash_exit);
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
fe869cdb HX	2	/*
	3	* algif_hash: User-space interface for hash algorithms
	4	*
	5	* This file provides the user-space API for hash algorithms.
	6	*
	7	* Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
fe869cdb HX	8	*/
	9
	10	#include <crypto/hash.h>
	11	#include <crypto/if_alg.h>
	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/mm.h>
	15	#include <linux/module.h>
	16	#include <linux/net.h>
	17	#include <net/sock.h>
	18
	19	struct hash_ctx {
	20	struct af_alg_sgl sgl;
	21
	22	u8 *result;
	23
2c3f8b16	24	struct crypto_wait wait;
fe869cdb HX	25
	26	unsigned int len;
	27	bool more;
	28
	29	struct ahash_request req;
	30	};
	31
493b2ed3 HX	32	static int hash_alloc_result(struct sock sk, struct hash_ctx ctx)
	33	{
	34	unsigned ds;
	35
	36	if (ctx->result)
	37	return 0;
	38
	39	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	40
	41	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
	42	if (!ctx->result)
	43	return -ENOMEM;
	44
	45	memset(ctx->result, 0, ds);
	46
	47	return 0;
	48	}
	49
	50	static void hash_free_result(struct sock sk, struct hash_ctx ctx)
	51	{
	52	unsigned ds;
	53
	54	if (!ctx->result)
	55	return;
	56
	57	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	58
	59	sock_kzfree_s(sk, ctx->result, ds);
	60	ctx->result = NULL;
	61	}
	62
1b784140 YX	63	static int hash_sendmsg(struct socket sock, struct msghdr msg,
1b784140 YX	64	size_t ignored)
fe869cdb HX	65	{
	66	int limit = ALG_MAX_PAGES * PAGE_SIZE;
	67	struct sock *sk = sock->sk;
	68	struct alg_sock *ask = alg_sk(sk);
	69	struct hash_ctx *ctx = ask->private;
fe869cdb HX	70	long copied = 0;
	71	int err;
	72
	73	if (limit > sk->sk_sndbuf)
	74	limit = sk->sk_sndbuf;
	75
	76	lock_sock(sk);
	77	if (!ctx->more) {
493b2ed3 HX	78	if ((msg->msg_flags & MSG_MORE))
	79	hash_free_result(sk, ctx);
	80
2c3f8b16	81	err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
fe869cdb HX	82	if (err)
	83	goto unlock;
	84	}
	85
fcb90d51	86	ctx->more = false;
fe869cdb	87
01e97e65 AV	88	while (msg_data_left(msg)) {
01e97e65 AV	89	int len = msg_data_left(msg);
fe869cdb	90
1d10eb2f AV	91	if (len > limit)
1d10eb2f AV	92	len = limit;
fe869cdb	93
1d10eb2f AV	94	len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
	95	if (len < 0) {
	96	err = copied ? 0 : len;
	97	goto unlock;
	98	}
fe869cdb	99
1d10eb2f	100	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
fe869cdb	101
2c3f8b16 GBY	102	err = crypto_wait_req(crypto_ahash_update(&ctx->req),
2c3f8b16 GBY	103	&ctx->wait);
1d10eb2f	104	af_alg_free_sg(&ctx->sgl);
dc5801f6 AV	105	if (err) {
dc5801f6 AV	106	iov_iter_revert(&msg->msg_iter, len);
1d10eb2f	107	goto unlock;
dc5801f6	108	}
fe869cdb	109
1d10eb2f	110	copied += len;
fe869cdb HX	111	}
	112
	113	err = 0;
	114
	115	ctx->more = msg->msg_flags & MSG_MORE;
	116	if (!ctx->more) {
493b2ed3 HX	117	err = hash_alloc_result(sk, ctx);
	118	if (err)
	119	goto unlock;
	120
fe869cdb	121	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
2c3f8b16 GBY	122	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
2c3f8b16 GBY	123	&ctx->wait);
fe869cdb HX	124	}
	125
	126	unlock:
	127	release_sock(sk);
	128
	129	return err ?: copied;
	130	}
	131
	132	static ssize_t hash_sendpage(struct socket sock, struct page page,
	133	int offset, size_t size, int flags)
	134	{
	135	struct sock *sk = sock->sk;
	136	struct alg_sock *ask = alg_sk(sk);
	137	struct hash_ctx *ctx = ask->private;
	138	int err;
	139
d3f7d56a SL	140	if (flags & MSG_SENDPAGE_NOTLAST)
	141	flags \|= MSG_MORE;
	142
fe869cdb HX	143	lock_sock(sk);
	144	sg_init_table(ctx->sgl.sg, 1);
	145	sg_set_page(ctx->sgl.sg, page, size, offset);
	146
493b2ed3 HX	147	if (!(flags & MSG_MORE)) {
	148	err = hash_alloc_result(sk, ctx);
	149	if (err)
	150	goto unlock;
	151	} else if (!ctx->more)
	152	hash_free_result(sk, ctx);
	153
fe869cdb HX	154	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
	155
	156	if (!(flags & MSG_MORE)) {
	157	if (ctx->more)
	158	err = crypto_ahash_finup(&ctx->req);
	159	else
	160	err = crypto_ahash_digest(&ctx->req);
	161	} else {
	162	if (!ctx->more) {
	163	err = crypto_ahash_init(&ctx->req);
2c3f8b16	164	err = crypto_wait_req(err, &ctx->wait);
fe869cdb HX	165	if (err)
	166	goto unlock;
	167	}
	168
	169	err = crypto_ahash_update(&ctx->req);
	170	}
	171
2c3f8b16	172	err = crypto_wait_req(err, &ctx->wait);
fe869cdb HX	173	if (err)
	174	goto unlock;
	175
	176	ctx->more = flags & MSG_MORE;
	177
	178	unlock:
	179	release_sock(sk);
	180
	181	return err ?: size;
	182	}
	183
1b784140 YX	184	static int hash_recvmsg(struct socket sock, struct msghdr msg, size_t len,
1b784140 YX	185	int flags)
fe869cdb HX	186	{
	187	struct sock *sk = sock->sk;
	188	struct alg_sock *ask = alg_sk(sk);
	189	struct hash_ctx *ctx = ask->private;
	190	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
493b2ed3	191	bool result;
fe869cdb HX	192	int err;
	193
	194	if (len > ds)
	195	len = ds;
	196	else if (len < ds)
	197	msg->msg_flags \|= MSG_TRUNC;
	198
	199	lock_sock(sk);
493b2ed3 HX	200	result = ctx->result;
	201	err = hash_alloc_result(sk, ctx);
	202	if (err)
	203	goto unlock;
	204
	205	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	206
8acf7a10	207	if (!result && !ctx->more) {
2c3f8b16 GBY	208	err = crypto_wait_req(crypto_ahash_init(&ctx->req),
2c3f8b16 GBY	209	&ctx->wait);
a8348bca HX	210	if (err)
	211	goto unlock;
	212	}
	213
	214	if (!result \|\| ctx->more) {
fcb90d51	215	ctx->more = false;
2c3f8b16 GBY	216	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
2c3f8b16 GBY	217	&ctx->wait);
fe869cdb HX	218	if (err)
	219	goto unlock;
	220	}
	221
7eab8d9e	222	err = memcpy_to_msg(msg, ctx->result, len);
fe869cdb HX	223
fe869cdb HX	224	unlock:
a8348bca	225	hash_free_result(sk, ctx);
fe869cdb HX	226	release_sock(sk);
	227
	228	return err ?: len;
	229	}
	230
cdfbabfb DH	231	static int hash_accept(struct socket sock, struct socket newsock, int flags,
cdfbabfb DH	232	bool kern)
fe869cdb HX	233	{
	234	struct sock *sk = sock->sk;
	235	struct alg_sock *ask = alg_sk(sk);
	236	struct hash_ctx *ctx = ask->private;
	237	struct ahash_request *req = &ctx->req;
acc03d89	238	struct crypto_ahash *tfm;
fe869cdb HX	239	struct sock *sk2;
	240	struct alg_sock *ask2;
	241	struct hash_ctx *ctx2;
acc03d89	242	char *state;
4afa5f96	243	bool more;
fe869cdb HX	244	int err;
fe869cdb HX	245
acc03d89 HX	246	tfm = crypto_ahash_reqtfm(req);
	247	state = kmalloc(crypto_ahash_statesize(tfm), GFP_KERNEL);
	248	err = -ENOMEM;
	249	if (!state)
	250	goto out;
	251
4afa5f96 HX	252	lock_sock(sk);
	253	more = ctx->more;
	254	err = more ? crypto_ahash_export(req, state) : 0;
	255	release_sock(sk);
	256
fe869cdb	257	if (err)
acc03d89	258	goto out_free_state;
fe869cdb	259
cdfbabfb	260	err = af_alg_accept(ask->parent, newsock, kern);
fe869cdb	261	if (err)
acc03d89	262	goto out_free_state;
fe869cdb HX	263
	264	sk2 = newsock->sk;
	265	ask2 = alg_sk(sk2);
	266	ctx2 = ask2->private;
4afa5f96 HX	267	ctx2->more = more;
	268
	269	if (!more)
acc03d89	270	goto out_free_state;
fe869cdb HX	271
	272	err = crypto_ahash_import(&ctx2->req, state);
	273	if (err) {
	274	sock_orphan(sk2);
	275	sock_put(sk2);
	276	}
	277
acc03d89 HX	278	out_free_state:
	279	kfree_sensitive(state);
	280
	281	out:
fe869cdb HX	282	return err;
	283	}
	284
	285	static struct proto_ops algif_hash_ops = {
	286	.family = PF_ALG,
	287
	288	.connect = sock_no_connect,
	289	.socketpair = sock_no_socketpair,
	290	.getname = sock_no_getname,
	291	.ioctl = sock_no_ioctl,
	292	.listen = sock_no_listen,
	293	.shutdown = sock_no_shutdown,
fe869cdb HX	294	.mmap = sock_no_mmap,
fe869cdb HX	295	.bind = sock_no_bind,
fe869cdb HX	296
	297	.release = af_alg_release,
	298	.sendmsg = hash_sendmsg,
	299	.sendpage = hash_sendpage,
	300	.recvmsg = hash_recvmsg,
	301	.accept = hash_accept,
	302	};
	303
6de62f15 HX	304	static int hash_check_key(struct socket *sock)
6de62f15 HX	305	{
ad46d7e3	306	int err = 0;
6de62f15 HX	307	struct sock *psk;
6de62f15 HX	308	struct alg_sock *pask;
9fa68f62	309	struct crypto_ahash *tfm;
6de62f15 HX	310	struct sock *sk = sock->sk;
	311	struct alg_sock *ask = alg_sk(sk);
	312
ad46d7e3	313	lock_sock(sk);
34c86f4c	314	if (!atomic_read(&ask->nokey_refcnt))
ad46d7e3	315	goto unlock_child;
6de62f15 HX	316
	317	psk = ask->parent;
	318	pask = alg_sk(ask->parent);
	319	tfm = pask->private;
	320
	321	err = -ENOKEY;
ad46d7e3	322	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
9fa68f62	323	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
6de62f15 HX	324	goto unlock;
6de62f15 HX	325
34c86f4c HX	326	atomic_dec(&pask->nokey_refcnt);
34c86f4c HX	327	atomic_set(&ask->nokey_refcnt, 0);
6de62f15 HX	328
	329	err = 0;
	330
	331	unlock:
	332	release_sock(psk);
ad46d7e3 HX	333	unlock_child:
ad46d7e3 HX	334	release_sock(sk);
6de62f15 HX	335
	336	return err;
	337	}
	338
	339	static int hash_sendmsg_nokey(struct socket sock, struct msghdr msg,
	340	size_t size)
	341	{
	342	int err;
	343
	344	err = hash_check_key(sock);
	345	if (err)
	346	return err;
	347
	348	return hash_sendmsg(sock, msg, size);
	349	}
	350
	351	static ssize_t hash_sendpage_nokey(struct socket sock, struct page page,
	352	int offset, size_t size, int flags)
	353	{
	354	int err;
	355
	356	err = hash_check_key(sock);
	357	if (err)
	358	return err;
	359
	360	return hash_sendpage(sock, page, offset, size, flags);
	361	}
	362
	363	static int hash_recvmsg_nokey(struct socket sock, struct msghdr msg,
	364	size_t ignored, int flags)
	365	{
	366	int err;
	367
	368	err = hash_check_key(sock);
	369	if (err)
	370	return err;
	371
	372	return hash_recvmsg(sock, msg, ignored, flags);
	373	}
	374
	375	static int hash_accept_nokey(struct socket sock, struct socket newsock,
cdfbabfb	376	int flags, bool kern)
6de62f15 HX	377	{
	378	int err;
	379
	380	err = hash_check_key(sock);
	381	if (err)
	382	return err;
	383
cdfbabfb	384	return hash_accept(sock, newsock, flags, kern);
6de62f15 HX	385	}
	386
	387	static struct proto_ops algif_hash_ops_nokey = {
	388	.family = PF_ALG,
	389
	390	.connect = sock_no_connect,
	391	.socketpair = sock_no_socketpair,
	392	.getname = sock_no_getname,
	393	.ioctl = sock_no_ioctl,
	394	.listen = sock_no_listen,
	395	.shutdown = sock_no_shutdown,
6de62f15 HX	396	.mmap = sock_no_mmap,
6de62f15 HX	397	.bind = sock_no_bind,
6de62f15 HX	398
	399	.release = af_alg_release,
	400	.sendmsg = hash_sendmsg_nokey,
	401	.sendpage = hash_sendpage_nokey,
	402	.recvmsg = hash_recvmsg_nokey,
	403	.accept = hash_accept_nokey,
	404	};
	405
fe869cdb HX	406	static void hash_bind(const char name, u32 type, u32 mask)
fe869cdb HX	407	{
9fa68f62	408	return crypto_alloc_ahash(name, type, mask);
fe869cdb HX	409	}
	410
	411	static void hash_release(void *private)
	412	{
9fa68f62	413	crypto_free_ahash(private);
fe869cdb HX	414	}
	415
	416	static int hash_setkey(void private, const u8 key, unsigned int keylen)
	417	{
9fa68f62	418	return crypto_ahash_setkey(private, key, keylen);
fe869cdb HX	419	}
fe869cdb HX	420
f1d84af1	421	static void hash_sock_destruct(struct sock *sk)
fe869cdb HX	422	{
	423	struct alg_sock *ask = alg_sk(sk);
	424	struct hash_ctx *ctx = ask->private;
	425
493b2ed3	426	hash_free_result(sk, ctx);
fe869cdb	427	sock_kfree_s(sk, ctx, ctx->len);
6de62f15 HX	428	af_alg_release_parent(sk);
	429	}
	430
f1d84af1	431	static int hash_accept_parent_nokey(void private, struct sock sk)
fe869cdb	432	{
9fa68f62	433	struct crypto_ahash *tfm = private;
fe869cdb	434	struct alg_sock *ask = alg_sk(sk);
9fa68f62 EB	435	struct hash_ctx *ctx;
9fa68f62 EB	436	unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
fe869cdb HX	437
	438	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	439	if (!ctx)
	440	return -ENOMEM;
	441
493b2ed3	442	ctx->result = NULL;
fe869cdb	443	ctx->len = len;
fcb90d51	444	ctx->more = false;
2c3f8b16	445	crypto_init_wait(&ctx->wait);
fe869cdb HX	446
	447	ask->private = ctx;
	448
9fa68f62	449	ahash_request_set_tfm(&ctx->req, tfm);
fe869cdb	450	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
2c3f8b16	451	crypto_req_done, &ctx->wait);
fe869cdb HX	452
	453	sk->sk_destruct = hash_sock_destruct;
	454
	455	return 0;
	456	}
	457
6de62f15 HX	458	static int hash_accept_parent(void private, struct sock sk)
6de62f15 HX	459	{
9fa68f62	460	struct crypto_ahash *tfm = private;
6de62f15	461
9fa68f62	462	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
6de62f15 HX	463	return -ENOKEY;
6de62f15 HX	464
f1d84af1	465	return hash_accept_parent_nokey(private, sk);
6de62f15 HX	466	}
6de62f15 HX	467
fe869cdb HX	468	static const struct af_alg_type algif_type_hash = {
	469	.bind = hash_bind,
	470	.release = hash_release,
	471	.setkey = hash_setkey,
	472	.accept = hash_accept_parent,
6de62f15	473	.accept_nokey = hash_accept_parent_nokey,
fe869cdb	474	.ops = &algif_hash_ops,
6de62f15	475	.ops_nokey = &algif_hash_ops_nokey,
fe869cdb HX	476	.name = "hash",
	477	.owner = THIS_MODULE
	478	};
	479
	480	static int __init algif_hash_init(void)
	481	{
	482	return af_alg_register_type(&algif_type_hash);
	483	}
	484
	485	static void __exit algif_hash_exit(void)
	486	{
	487	int err = af_alg_unregister_type(&algif_type_hash);
	488	BUG_ON(err);
	489	}
	490
	491	module_init(algif_hash_init);
	492	module_exit(algif_hash_exit);
	493	MODULE_LICENSE("GPL");