[thirdparty/linux.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)
			goto unlock;

		copied += len;
		iov_iter_advance(&msg->msg_iter, 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;
	char state[HASH_MAX_STATESIZE];
	struct sock *sk2;
	struct alg_sock *ask2;
	struct hash_ctx *ctx2;
	bool more;
	int err;

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

	if (err)
		return err;

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

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

	if (!more)
		return err;

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

	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,
	.getsockopt	=	sock_no_getsockopt,
	.mmap		=	sock_no_mmap,
	.bind		=	sock_no_bind,
	.setsockopt	=	sock_no_setsockopt,

	.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 (ask->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;

	if (!pask->refcnt++)
		sock_hold(psk);

	ask->refcnt = 1;
	sock_put(psk);

	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,
	.getsockopt	=	sock_no_getsockopt,
	.mmap		=	sock_no_mmap,
	.bind		=	sock_no_bind,
	.setsockopt	=	sock_no_setsockopt,

	.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 AV	104	af_alg_free_sg(&ctx->sgl);
	105	if (err)
	106	goto unlock;
fe869cdb	107
1d10eb2f AV	108	copied += len;
1d10eb2f AV	109	iov_iter_advance(&msg->msg_iter, len);
fe869cdb HX	110	}
	111
	112	err = 0;
	113
	114	ctx->more = msg->msg_flags & MSG_MORE;
	115	if (!ctx->more) {
493b2ed3 HX	116	err = hash_alloc_result(sk, ctx);
	117	if (err)
	118	goto unlock;
	119
fe869cdb	120	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
2c3f8b16 GBY	121	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
2c3f8b16 GBY	122	&ctx->wait);
fe869cdb HX	123	}
	124
	125	unlock:
	126	release_sock(sk);
	127
	128	return err ?: copied;
	129	}
	130
	131	static ssize_t hash_sendpage(struct socket sock, struct page page,
	132	int offset, size_t size, int flags)
	133	{
	134	struct sock *sk = sock->sk;
	135	struct alg_sock *ask = alg_sk(sk);
	136	struct hash_ctx *ctx = ask->private;
	137	int err;
	138
d3f7d56a SL	139	if (flags & MSG_SENDPAGE_NOTLAST)
	140	flags \|= MSG_MORE;
	141
fe869cdb HX	142	lock_sock(sk);
	143	sg_init_table(ctx->sgl.sg, 1);
	144	sg_set_page(ctx->sgl.sg, page, size, offset);
	145
493b2ed3 HX	146	if (!(flags & MSG_MORE)) {
	147	err = hash_alloc_result(sk, ctx);
	148	if (err)
	149	goto unlock;
	150	} else if (!ctx->more)
	151	hash_free_result(sk, ctx);
	152
fe869cdb HX	153	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
	154
	155	if (!(flags & MSG_MORE)) {
	156	if (ctx->more)
	157	err = crypto_ahash_finup(&ctx->req);
	158	else
	159	err = crypto_ahash_digest(&ctx->req);
	160	} else {
	161	if (!ctx->more) {
	162	err = crypto_ahash_init(&ctx->req);
2c3f8b16	163	err = crypto_wait_req(err, &ctx->wait);
fe869cdb HX	164	if (err)
	165	goto unlock;
	166	}
	167
	168	err = crypto_ahash_update(&ctx->req);
	169	}
	170
2c3f8b16	171	err = crypto_wait_req(err, &ctx->wait);
fe869cdb HX	172	if (err)
	173	goto unlock;
	174
	175	ctx->more = flags & MSG_MORE;
	176
	177	unlock:
	178	release_sock(sk);
	179
	180	return err ?: size;
	181	}
	182
1b784140 YX	183	static int hash_recvmsg(struct socket sock, struct msghdr msg, size_t len,
1b784140 YX	184	int flags)
fe869cdb HX	185	{
	186	struct sock *sk = sock->sk;
	187	struct alg_sock *ask = alg_sk(sk);
	188	struct hash_ctx *ctx = ask->private;
	189	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
493b2ed3	190	bool result;
fe869cdb HX	191	int err;
	192
	193	if (len > ds)
	194	len = ds;
	195	else if (len < ds)
	196	msg->msg_flags \|= MSG_TRUNC;
	197
	198	lock_sock(sk);
493b2ed3 HX	199	result = ctx->result;
	200	err = hash_alloc_result(sk, ctx);
	201	if (err)
	202	goto unlock;
	203
	204	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	205
8acf7a10	206	if (!result && !ctx->more) {
2c3f8b16 GBY	207	err = crypto_wait_req(crypto_ahash_init(&ctx->req),
2c3f8b16 GBY	208	&ctx->wait);
a8348bca HX	209	if (err)
	210	goto unlock;
	211	}
	212
	213	if (!result \|\| ctx->more) {
fcb90d51	214	ctx->more = false;
2c3f8b16 GBY	215	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
2c3f8b16 GBY	216	&ctx->wait);
fe869cdb HX	217	if (err)
	218	goto unlock;
	219	}
	220
7eab8d9e	221	err = memcpy_to_msg(msg, ctx->result, len);
fe869cdb HX	222
fe869cdb HX	223	unlock:
a8348bca	224	hash_free_result(sk, ctx);
fe869cdb HX	225	release_sock(sk);
	226
	227	return err ?: len;
	228	}
	229
cdfbabfb DH	230	static int hash_accept(struct socket sock, struct socket newsock, int flags,
cdfbabfb DH	231	bool kern)
fe869cdb HX	232	{
	233	struct sock *sk = sock->sk;
	234	struct alg_sock *ask = alg_sk(sk);
	235	struct hash_ctx *ctx = ask->private;
	236	struct ahash_request *req = &ctx->req;
b68a7ec1	237	char state[HASH_MAX_STATESIZE];
fe869cdb HX	238	struct sock *sk2;
	239	struct alg_sock *ask2;
	240	struct hash_ctx *ctx2;
4afa5f96	241	bool more;
fe869cdb HX	242	int err;
fe869cdb HX	243
4afa5f96 HX	244	lock_sock(sk);
	245	more = ctx->more;
	246	err = more ? crypto_ahash_export(req, state) : 0;
	247	release_sock(sk);
	248
fe869cdb HX	249	if (err)
	250	return err;
	251
cdfbabfb	252	err = af_alg_accept(ask->parent, newsock, kern);
fe869cdb HX	253	if (err)
	254	return err;
	255
	256	sk2 = newsock->sk;
	257	ask2 = alg_sk(sk2);
	258	ctx2 = ask2->private;
4afa5f96 HX	259	ctx2->more = more;
	260
	261	if (!more)
	262	return err;
fe869cdb HX	263
	264	err = crypto_ahash_import(&ctx2->req, state);
	265	if (err) {
	266	sock_orphan(sk2);
	267	sock_put(sk2);
	268	}
	269
	270	return err;
	271	}
	272
	273	static struct proto_ops algif_hash_ops = {
	274	.family = PF_ALG,
	275
	276	.connect = sock_no_connect,
	277	.socketpair = sock_no_socketpair,
	278	.getname = sock_no_getname,
	279	.ioctl = sock_no_ioctl,
	280	.listen = sock_no_listen,
	281	.shutdown = sock_no_shutdown,
	282	.getsockopt = sock_no_getsockopt,
	283	.mmap = sock_no_mmap,
	284	.bind = sock_no_bind,
	285	.setsockopt = sock_no_setsockopt,
fe869cdb HX	286
	287	.release = af_alg_release,
	288	.sendmsg = hash_sendmsg,
	289	.sendpage = hash_sendpage,
	290	.recvmsg = hash_recvmsg,
	291	.accept = hash_accept,
	292	};
	293
6de62f15 HX	294	static int hash_check_key(struct socket *sock)
6de62f15 HX	295	{
ad46d7e3	296	int err = 0;
6de62f15 HX	297	struct sock *psk;
6de62f15 HX	298	struct alg_sock *pask;
9fa68f62	299	struct crypto_ahash *tfm;
6de62f15 HX	300	struct sock *sk = sock->sk;
	301	struct alg_sock *ask = alg_sk(sk);
	302
ad46d7e3	303	lock_sock(sk);
6de62f15	304	if (ask->refcnt)
ad46d7e3	305	goto unlock_child;
6de62f15 HX	306
	307	psk = ask->parent;
	308	pask = alg_sk(ask->parent);
	309	tfm = pask->private;
	310
	311	err = -ENOKEY;
ad46d7e3	312	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
9fa68f62	313	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
6de62f15 HX	314	goto unlock;
	315
	316	if (!pask->refcnt++)
	317	sock_hold(psk);
	318
	319	ask->refcnt = 1;
	320	sock_put(psk);
	321
	322	err = 0;
	323
	324	unlock:
	325	release_sock(psk);
ad46d7e3 HX	326	unlock_child:
ad46d7e3 HX	327	release_sock(sk);
6de62f15 HX	328
	329	return err;
	330	}
	331
	332	static int hash_sendmsg_nokey(struct socket sock, struct msghdr msg,
	333	size_t size)
	334	{
	335	int err;
	336
	337	err = hash_check_key(sock);
	338	if (err)
	339	return err;
	340
	341	return hash_sendmsg(sock, msg, size);
	342	}
	343
	344	static ssize_t hash_sendpage_nokey(struct socket sock, struct page page,
	345	int offset, size_t size, int flags)
	346	{
	347	int err;
	348
	349	err = hash_check_key(sock);
	350	if (err)
	351	return err;
	352
	353	return hash_sendpage(sock, page, offset, size, flags);
	354	}
	355
	356	static int hash_recvmsg_nokey(struct socket sock, struct msghdr msg,
	357	size_t ignored, int flags)
	358	{
	359	int err;
	360
	361	err = hash_check_key(sock);
	362	if (err)
	363	return err;
	364
	365	return hash_recvmsg(sock, msg, ignored, flags);
	366	}
	367
	368	static int hash_accept_nokey(struct socket sock, struct socket newsock,
cdfbabfb	369	int flags, bool kern)
6de62f15 HX	370	{
	371	int err;
	372
	373	err = hash_check_key(sock);
	374	if (err)
	375	return err;
	376
cdfbabfb	377	return hash_accept(sock, newsock, flags, kern);
6de62f15 HX	378	}
	379
	380	static struct proto_ops algif_hash_ops_nokey = {
	381	.family = PF_ALG,
	382
	383	.connect = sock_no_connect,
	384	.socketpair = sock_no_socketpair,
	385	.getname = sock_no_getname,
	386	.ioctl = sock_no_ioctl,
	387	.listen = sock_no_listen,
	388	.shutdown = sock_no_shutdown,
	389	.getsockopt = sock_no_getsockopt,
	390	.mmap = sock_no_mmap,
	391	.bind = sock_no_bind,
	392	.setsockopt = sock_no_setsockopt,
6de62f15 HX	393
	394	.release = af_alg_release,
	395	.sendmsg = hash_sendmsg_nokey,
	396	.sendpage = hash_sendpage_nokey,
	397	.recvmsg = hash_recvmsg_nokey,
	398	.accept = hash_accept_nokey,
	399	};
	400
fe869cdb HX	401	static void hash_bind(const char name, u32 type, u32 mask)
fe869cdb HX	402	{
9fa68f62	403	return crypto_alloc_ahash(name, type, mask);
fe869cdb HX	404	}
	405
	406	static void hash_release(void *private)
	407	{
9fa68f62	408	crypto_free_ahash(private);
fe869cdb HX	409	}
	410
	411	static int hash_setkey(void private, const u8 key, unsigned int keylen)
	412	{
9fa68f62	413	return crypto_ahash_setkey(private, key, keylen);
fe869cdb HX	414	}
fe869cdb HX	415
f1d84af1	416	static void hash_sock_destruct(struct sock *sk)
fe869cdb HX	417	{
	418	struct alg_sock *ask = alg_sk(sk);
	419	struct hash_ctx *ctx = ask->private;
	420
493b2ed3	421	hash_free_result(sk, ctx);
fe869cdb	422	sock_kfree_s(sk, ctx, ctx->len);
6de62f15 HX	423	af_alg_release_parent(sk);
	424	}
	425
f1d84af1	426	static int hash_accept_parent_nokey(void private, struct sock sk)
fe869cdb	427	{
9fa68f62	428	struct crypto_ahash *tfm = private;
fe869cdb	429	struct alg_sock *ask = alg_sk(sk);
9fa68f62 EB	430	struct hash_ctx *ctx;
9fa68f62 EB	431	unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
fe869cdb HX	432
	433	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	434	if (!ctx)
	435	return -ENOMEM;
	436
493b2ed3	437	ctx->result = NULL;
fe869cdb	438	ctx->len = len;
fcb90d51	439	ctx->more = false;
2c3f8b16	440	crypto_init_wait(&ctx->wait);
fe869cdb HX	441
	442	ask->private = ctx;
	443
9fa68f62	444	ahash_request_set_tfm(&ctx->req, tfm);
fe869cdb	445	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
2c3f8b16	446	crypto_req_done, &ctx->wait);
fe869cdb HX	447
	448	sk->sk_destruct = hash_sock_destruct;
	449
	450	return 0;
	451	}
	452
6de62f15 HX	453	static int hash_accept_parent(void private, struct sock sk)
6de62f15 HX	454	{
9fa68f62	455	struct crypto_ahash *tfm = private;
6de62f15	456
9fa68f62	457	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
6de62f15 HX	458	return -ENOKEY;
6de62f15 HX	459
f1d84af1	460	return hash_accept_parent_nokey(private, sk);
6de62f15 HX	461	}
6de62f15 HX	462
fe869cdb HX	463	static const struct af_alg_type algif_type_hash = {
	464	.bind = hash_bind,
	465	.release = hash_release,
	466	.setkey = hash_setkey,
	467	.accept = hash_accept_parent,
6de62f15	468	.accept_nokey = hash_accept_parent_nokey,
fe869cdb	469	.ops = &algif_hash_ops,
6de62f15	470	.ops_nokey = &algif_hash_ops_nokey,
fe869cdb HX	471	.name = "hash",
	472	.owner = THIS_MODULE
	473	};
	474
	475	static int __init algif_hash_init(void)
	476	{
	477	return af_alg_register_type(&algif_type_hash);
	478	}
	479
	480	static void __exit algif_hash_exit(void)
	481	{
	482	int err = af_alg_unregister_type(&algif_type_hash);
	483	BUG_ON(err);
	484	}
	485
	486	module_init(algif_hash_init);
	487	module_exit(algif_hash_exit);
	488	MODULE_LICENSE("GPL");