[mirror_ubuntu-hirsute-kernel.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,
	.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
	1	// SPDX-License-Identifier: GPL-2.0-or-later
	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>
	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
	24	struct crypto_wait wait;
	25
	26	unsigned int len;
	27	bool more;
	28
	29	struct ahash_request req;
	30	};
	31
	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
	63	static int hash_sendmsg(struct socket sock, struct msghdr msg,
	64	size_t ignored)
	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;
	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) {
	78	if ((msg->msg_flags & MSG_MORE))
	79	hash_free_result(sk, ctx);
	80
	81	err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
	82	if (err)
	83	goto unlock;
	84	}
	85
	86	ctx->more = false;
	87
	88	while (msg_data_left(msg)) {
	89	int len = msg_data_left(msg);
	90
	91	if (len > limit)
	92	len = limit;
	93
	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	}
	99
	100	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
	101
	102	err = crypto_wait_req(crypto_ahash_update(&ctx->req),
	103	&ctx->wait);
	104	af_alg_free_sg(&ctx->sgl);
	105	if (err)
	106	goto unlock;
	107
	108	copied += len;
	109	iov_iter_advance(&msg->msg_iter, len);
	110	}
	111
	112	err = 0;
	113
	114	ctx->more = msg->msg_flags & MSG_MORE;
	115	if (!ctx->more) {
	116	err = hash_alloc_result(sk, ctx);
	117	if (err)
	118	goto unlock;
	119
	120	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	121	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
	122	&ctx->wait);
	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
	139	if (flags & MSG_SENDPAGE_NOTLAST)
	140	flags \|= MSG_MORE;
	141
	142	lock_sock(sk);
	143	sg_init_table(ctx->sgl.sg, 1);
	144	sg_set_page(ctx->sgl.sg, page, size, offset);
	145
	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
	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);
	163	err = crypto_wait_req(err, &ctx->wait);
	164	if (err)
	165	goto unlock;
	166	}
	167
	168	err = crypto_ahash_update(&ctx->req);
	169	}
	170
	171	err = crypto_wait_req(err, &ctx->wait);
	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
	183	static int hash_recvmsg(struct socket sock, struct msghdr msg, size_t len,
	184	int flags)
	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));
	190	bool result;
	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);
	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
	206	if (!result && !ctx->more) {
	207	err = crypto_wait_req(crypto_ahash_init(&ctx->req),
	208	&ctx->wait);
	209	if (err)
	210	goto unlock;
	211	}
	212
	213	if (!result \|\| ctx->more) {
	214	ctx->more = false;
	215	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
	216	&ctx->wait);
	217	if (err)
	218	goto unlock;
	219	}
	220
	221	err = memcpy_to_msg(msg, ctx->result, len);
	222
	223	unlock:
	224	hash_free_result(sk, ctx);
	225	release_sock(sk);
	226
	227	return err ?: len;
	228	}
	229
	230	static int hash_accept(struct socket sock, struct socket newsock, int flags,
	231	bool kern)
	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;
	237	char state[HASH_MAX_STATESIZE];
	238	struct sock *sk2;
	239	struct alg_sock *ask2;
	240	struct hash_ctx *ctx2;
	241	bool more;
	242	int err;
	243
	244	lock_sock(sk);
	245	more = ctx->more;
	246	err = more ? crypto_ahash_export(req, state) : 0;
	247	release_sock(sk);
	248
	249	if (err)
	250	return err;
	251
	252	err = af_alg_accept(ask->parent, newsock, kern);
	253	if (err)
	254	return err;
	255
	256	sk2 = newsock->sk;
	257	ask2 = alg_sk(sk2);
	258	ctx2 = ask2->private;
	259	ctx2->more = more;
	260
	261	if (!more)
	262	return err;
	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	.mmap = sock_no_mmap,
	283	.bind = sock_no_bind,
	284
	285	.release = af_alg_release,
	286	.sendmsg = hash_sendmsg,
	287	.sendpage = hash_sendpage,
	288	.recvmsg = hash_recvmsg,
	289	.accept = hash_accept,
	290	};
	291
	292	static int hash_check_key(struct socket *sock)
	293	{
	294	int err = 0;
	295	struct sock *psk;
	296	struct alg_sock *pask;
	297	struct crypto_ahash *tfm;
	298	struct sock *sk = sock->sk;
	299	struct alg_sock *ask = alg_sk(sk);
	300
	301	lock_sock(sk);
	302	if (!atomic_read(&ask->nokey_refcnt))
	303	goto unlock_child;
	304
	305	psk = ask->parent;
	306	pask = alg_sk(ask->parent);
	307	tfm = pask->private;
	308
	309	err = -ENOKEY;
	310	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
	311	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
	312	goto unlock;
	313
	314	atomic_dec(&pask->nokey_refcnt);
	315	atomic_set(&ask->nokey_refcnt, 0);
	316
	317	err = 0;
	318
	319	unlock:
	320	release_sock(psk);
	321	unlock_child:
	322	release_sock(sk);
	323
	324	return err;
	325	}
	326
	327	static int hash_sendmsg_nokey(struct socket sock, struct msghdr msg,
	328	size_t size)
	329	{
	330	int err;
	331
	332	err = hash_check_key(sock);
	333	if (err)
	334	return err;
	335
	336	return hash_sendmsg(sock, msg, size);
	337	}
	338
	339	static ssize_t hash_sendpage_nokey(struct socket sock, struct page page,
	340	int offset, size_t size, int flags)
	341	{
	342	int err;
	343
	344	err = hash_check_key(sock);
	345	if (err)
	346	return err;
	347
	348	return hash_sendpage(sock, page, offset, size, flags);
	349	}
	350
	351	static int hash_recvmsg_nokey(struct socket sock, struct msghdr msg,
	352	size_t ignored, int flags)
	353	{
	354	int err;
	355
	356	err = hash_check_key(sock);
	357	if (err)
	358	return err;
	359
	360	return hash_recvmsg(sock, msg, ignored, flags);
	361	}
	362
	363	static int hash_accept_nokey(struct socket sock, struct socket newsock,
	364	int flags, bool kern)
	365	{
	366	int err;
	367
	368	err = hash_check_key(sock);
	369	if (err)
	370	return err;
	371
	372	return hash_accept(sock, newsock, flags, kern);
	373	}
	374
	375	static struct proto_ops algif_hash_ops_nokey = {
	376	.family = PF_ALG,
	377
	378	.connect = sock_no_connect,
	379	.socketpair = sock_no_socketpair,
	380	.getname = sock_no_getname,
	381	.ioctl = sock_no_ioctl,
	382	.listen = sock_no_listen,
	383	.shutdown = sock_no_shutdown,
	384	.mmap = sock_no_mmap,
	385	.bind = sock_no_bind,
	386
	387	.release = af_alg_release,
	388	.sendmsg = hash_sendmsg_nokey,
	389	.sendpage = hash_sendpage_nokey,
	390	.recvmsg = hash_recvmsg_nokey,
	391	.accept = hash_accept_nokey,
	392	};
	393
	394	static void hash_bind(const char name, u32 type, u32 mask)
	395	{
	396	return crypto_alloc_ahash(name, type, mask);
	397	}
	398
	399	static void hash_release(void *private)
	400	{
	401	crypto_free_ahash(private);
	402	}
	403
	404	static int hash_setkey(void private, const u8 key, unsigned int keylen)
	405	{
	406	return crypto_ahash_setkey(private, key, keylen);
	407	}
	408
	409	static void hash_sock_destruct(struct sock *sk)
	410	{
	411	struct alg_sock *ask = alg_sk(sk);
	412	struct hash_ctx *ctx = ask->private;
	413
	414	hash_free_result(sk, ctx);
	415	sock_kfree_s(sk, ctx, ctx->len);
	416	af_alg_release_parent(sk);
	417	}
	418
	419	static int hash_accept_parent_nokey(void private, struct sock sk)
	420	{
	421	struct crypto_ahash *tfm = private;
	422	struct alg_sock *ask = alg_sk(sk);
	423	struct hash_ctx *ctx;
	424	unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
	425
	426	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	427	if (!ctx)
	428	return -ENOMEM;
	429
	430	ctx->result = NULL;
	431	ctx->len = len;
	432	ctx->more = false;
	433	crypto_init_wait(&ctx->wait);
	434
	435	ask->private = ctx;
	436
	437	ahash_request_set_tfm(&ctx->req, tfm);
	438	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
	439	crypto_req_done, &ctx->wait);
	440
	441	sk->sk_destruct = hash_sock_destruct;
	442
	443	return 0;
	444	}
	445
	446	static int hash_accept_parent(void private, struct sock sk)
	447	{
	448	struct crypto_ahash *tfm = private;
	449
	450	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
	451	return -ENOKEY;
	452
	453	return hash_accept_parent_nokey(private, sk);
	454	}
	455
	456	static const struct af_alg_type algif_type_hash = {
	457	.bind = hash_bind,
	458	.release = hash_release,
	459	.setkey = hash_setkey,
	460	.accept = hash_accept_parent,
	461	.accept_nokey = hash_accept_parent_nokey,
	462	.ops = &algif_hash_ops,
	463	.ops_nokey = &algif_hash_ops_nokey,
	464	.name = "hash",
	465	.owner = THIS_MODULE
	466	};
	467
	468	static int __init algif_hash_init(void)
	469	{
	470	return af_alg_register_type(&algif_type_hash);
	471	}
	472
	473	static void __exit algif_hash_exit(void)
	474	{
	475	int err = af_alg_unregister_type(&algif_type_hash);
	476	BUG_ON(err);
	477	}
	478
	479	module_init(algif_hash_init);
	480	module_exit(algif_hash_exit);
	481	MODULE_LICENSE("GPL");