[mirror_ubuntu-bionic-kernel.git] / crypto / algif_hash.c

/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#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 af_alg_completion completion;

	unsigned int len;
	bool more;

	struct ahash_request req;
};

struct algif_hash_tfm {
	struct crypto_ahash *hash;
	bool has_key;
};

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) {
		err = crypto_ahash_init(&ctx->req);
		if (err)
			goto unlock;
	}

	ctx->more = 0;

	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 = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
						 &ctx->completion);
		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) {
		ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
		err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
						 &ctx->completion);
	}

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);

	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);
			if (err)
				goto unlock;
		}

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

	err = af_alg_wait_for_completion(err, &ctx->completion);
	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));
	int err;

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

	lock_sock(sk);
	if (ctx->more) {
		ctx->more = 0;
		ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
		err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
						 &ctx->completion);
		if (err)
			goto unlock;
	}

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

unlock:
	release_sock(sk);

	return err ?: len;
}

static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
{
	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[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
	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);
	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,
	.poll		=	sock_no_poll,

	.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;
	struct sock *psk;
	struct alg_sock *pask;
	struct algif_hash_tfm *tfm;
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);

	if (ask->refcnt)
		return 0;

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

	err = -ENOKEY;
	lock_sock(psk);
	if (!tfm->has_key)
		goto unlock;

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

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

	err = 0;

unlock:
	release_sock(psk);

	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)
{
	int err;

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

	return hash_accept(sock, newsock, flags);
}

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,
	.poll		=	sock_no_poll,

	.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)
{
	struct algif_hash_tfm *tfm;
	struct crypto_ahash *hash;

	tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
	if (!tfm)
		return ERR_PTR(-ENOMEM);

	hash = crypto_alloc_ahash(name, type, mask);
	if (IS_ERR(hash)) {
		kfree(tfm);
		return ERR_CAST(hash);
	}

	tfm->hash = hash;

	return tfm;
}

static void hash_release(void *private)
{
	struct algif_hash_tfm *tfm = private;

	crypto_free_ahash(tfm->hash);
	kfree(tfm);
}

static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
{
	struct algif_hash_tfm *tfm = private;
	int err;

	err = crypto_ahash_setkey(tfm->hash, key, keylen);
	tfm->has_key = !err;

	return err;
}

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

	sock_kzfree_s(sk, ctx->result,
		      crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
	sock_kfree_s(sk, ctx, ctx->len);
}

static void hash_sock_destruct(struct sock *sk)
{
	hash_sock_destruct_common(sk);
	af_alg_release_parent(sk);
}

static void hash_release_parent_nokey(struct sock *sk)
{
	struct alg_sock *ask = alg_sk(sk);

	if (!ask->refcnt) {
		sock_put(ask->parent);
		return;
	}

	af_alg_release_parent(sk);
}

static void hash_sock_destruct_nokey(struct sock *sk)
{
	hash_sock_destruct_common(sk);
	hash_release_parent_nokey(sk);
}

static int hash_accept_parent_common(void *private, struct sock *sk)
{
	struct hash_ctx *ctx;
	struct alg_sock *ask = alg_sk(sk);
	struct algif_hash_tfm *tfm = private;
	struct crypto_ahash *hash = tfm->hash;
	unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
	unsigned ds = crypto_ahash_digestsize(hash);

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

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

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

	ctx->len = len;
	ctx->more = 0;
	af_alg_init_completion(&ctx->completion);

	ask->private = ctx;

	ahash_request_set_tfm(&ctx->req, hash);
	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
				   af_alg_complete, &ctx->completion);

	sk->sk_destruct = hash_sock_destruct;

	return 0;
}

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

	if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
		return -ENOKEY;

	return hash_accept_parent_common(private, sk);
}

static int hash_accept_parent_nokey(void *private, struct sock *sk)
{
	int err;

	err = hash_accept_parent_common(private, sk);
	if (err)
		goto out;

	sk->sk_destruct = hash_sock_destruct_nokey;

out:
	return err;
}

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
fe869cdb HX	1	/*
	2	* algif_hash: User-space interface for hash algorithms
	3	*
	4	* This file provides the user-space API for hash algorithms.
	5	*
	6	* Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the Free
	10	* Software Foundation; either version 2 of the License, or (at your option)
	11	* any later version.
	12	*
	13	*/
	14
	15	#include <crypto/hash.h>
	16	#include <crypto/if_alg.h>
	17	#include <linux/init.h>
	18	#include <linux/kernel.h>
	19	#include <linux/mm.h>
	20	#include <linux/module.h>
	21	#include <linux/net.h>
	22	#include <net/sock.h>
	23
	24	struct hash_ctx {
	25	struct af_alg_sgl sgl;
	26
	27	u8 *result;
	28
	29	struct af_alg_completion completion;
	30
	31	unsigned int len;
	32	bool more;
	33
	34	struct ahash_request req;
	35	};
	36
6de62f15 HX	37	struct algif_hash_tfm {
	38	struct crypto_ahash *hash;
	39	bool has_key;
	40	};
	41
1b784140 YX	42	static int hash_sendmsg(struct socket sock, struct msghdr msg,
1b784140 YX	43	size_t ignored)
fe869cdb HX	44	{
	45	int limit = ALG_MAX_PAGES * PAGE_SIZE;
	46	struct sock *sk = sock->sk;
	47	struct alg_sock *ask = alg_sk(sk);
	48	struct hash_ctx *ctx = ask->private;
fe869cdb HX	49	long copied = 0;
	50	int err;
	51
	52	if (limit > sk->sk_sndbuf)
	53	limit = sk->sk_sndbuf;
	54
	55	lock_sock(sk);
	56	if (!ctx->more) {
	57	err = crypto_ahash_init(&ctx->req);
	58	if (err)
	59	goto unlock;
	60	}
	61
	62	ctx->more = 0;
	63
01e97e65 AV	64	while (msg_data_left(msg)) {
01e97e65 AV	65	int len = msg_data_left(msg);
fe869cdb	66
1d10eb2f AV	67	if (len > limit)
1d10eb2f AV	68	len = limit;
fe869cdb	69
1d10eb2f AV	70	len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
	71	if (len < 0) {
	72	err = copied ? 0 : len;
	73	goto unlock;
	74	}
fe869cdb	75
1d10eb2f	76	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
fe869cdb	77
1d10eb2f AV	78	err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
	79	&ctx->completion);
	80	af_alg_free_sg(&ctx->sgl);
	81	if (err)
	82	goto unlock;
fe869cdb	83
1d10eb2f AV	84	copied += len;
1d10eb2f AV	85	iov_iter_advance(&msg->msg_iter, len);
fe869cdb HX	86	}
	87
	88	err = 0;
	89
	90	ctx->more = msg->msg_flags & MSG_MORE;
	91	if (!ctx->more) {
	92	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	93	err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
	94	&ctx->completion);
	95	}
	96
	97	unlock:
	98	release_sock(sk);
	99
	100	return err ?: copied;
	101	}
	102
	103	static ssize_t hash_sendpage(struct socket sock, struct page page,
	104	int offset, size_t size, int flags)
	105	{
	106	struct sock *sk = sock->sk;
	107	struct alg_sock *ask = alg_sk(sk);
	108	struct hash_ctx *ctx = ask->private;
	109	int err;
	110
d3f7d56a SL	111	if (flags & MSG_SENDPAGE_NOTLAST)
	112	flags \|= MSG_MORE;
	113
fe869cdb HX	114	lock_sock(sk);
	115	sg_init_table(ctx->sgl.sg, 1);
	116	sg_set_page(ctx->sgl.sg, page, size, offset);
	117
	118	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
	119
	120	if (!(flags & MSG_MORE)) {
	121	if (ctx->more)
	122	err = crypto_ahash_finup(&ctx->req);
	123	else
	124	err = crypto_ahash_digest(&ctx->req);
	125	} else {
	126	if (!ctx->more) {
	127	err = crypto_ahash_init(&ctx->req);
	128	if (err)
	129	goto unlock;
	130	}
	131
	132	err = crypto_ahash_update(&ctx->req);
	133	}
	134
	135	err = af_alg_wait_for_completion(err, &ctx->completion);
	136	if (err)
	137	goto unlock;
	138
	139	ctx->more = flags & MSG_MORE;
	140
	141	unlock:
	142	release_sock(sk);
	143
	144	return err ?: size;
	145	}
	146
1b784140 YX	147	static int hash_recvmsg(struct socket sock, struct msghdr msg, size_t len,
1b784140 YX	148	int flags)
fe869cdb HX	149	{
	150	struct sock *sk = sock->sk;
	151	struct alg_sock *ask = alg_sk(sk);
	152	struct hash_ctx *ctx = ask->private;
	153	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	154	int err;
	155
	156	if (len > ds)
	157	len = ds;
	158	else if (len < ds)
	159	msg->msg_flags \|= MSG_TRUNC;
	160
	161	lock_sock(sk);
	162	if (ctx->more) {
	163	ctx->more = 0;
	164	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	165	err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
	166	&ctx->completion);
	167	if (err)
	168	goto unlock;
	169	}
	170
7eab8d9e	171	err = memcpy_to_msg(msg, ctx->result, len);
fe869cdb HX	172
	173	unlock:
	174	release_sock(sk);
	175
	176	return err ?: len;
	177	}
	178
	179	static int hash_accept(struct socket sock, struct socket newsock, int flags)
	180	{
	181	struct sock *sk = sock->sk;
	182	struct alg_sock *ask = alg_sk(sk);
	183	struct hash_ctx *ctx = ask->private;
	184	struct ahash_request *req = &ctx->req;
	185	char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
	186	struct sock *sk2;
	187	struct alg_sock *ask2;
	188	struct hash_ctx *ctx2;
4afa5f96	189	bool more;
fe869cdb HX	190	int err;
fe869cdb HX	191
4afa5f96 HX	192	lock_sock(sk);
	193	more = ctx->more;
	194	err = more ? crypto_ahash_export(req, state) : 0;
	195	release_sock(sk);
	196
fe869cdb HX	197	if (err)
	198	return err;
	199
	200	err = af_alg_accept(ask->parent, newsock);
	201	if (err)
	202	return err;
	203
	204	sk2 = newsock->sk;
	205	ask2 = alg_sk(sk2);
	206	ctx2 = ask2->private;
4afa5f96 HX	207	ctx2->more = more;
	208
	209	if (!more)
	210	return err;
fe869cdb HX	211
	212	err = crypto_ahash_import(&ctx2->req, state);
	213	if (err) {
	214	sock_orphan(sk2);
	215	sock_put(sk2);
	216	}
	217
	218	return err;
	219	}
	220
	221	static struct proto_ops algif_hash_ops = {
	222	.family = PF_ALG,
	223
	224	.connect = sock_no_connect,
	225	.socketpair = sock_no_socketpair,
	226	.getname = sock_no_getname,
	227	.ioctl = sock_no_ioctl,
	228	.listen = sock_no_listen,
	229	.shutdown = sock_no_shutdown,
	230	.getsockopt = sock_no_getsockopt,
	231	.mmap = sock_no_mmap,
	232	.bind = sock_no_bind,
	233	.setsockopt = sock_no_setsockopt,
	234	.poll = sock_no_poll,
	235
	236	.release = af_alg_release,
	237	.sendmsg = hash_sendmsg,
	238	.sendpage = hash_sendpage,
	239	.recvmsg = hash_recvmsg,
	240	.accept = hash_accept,
	241	};
	242
6de62f15 HX	243	static int hash_check_key(struct socket *sock)
	244	{
	245	int err;
	246	struct sock *psk;
	247	struct alg_sock *pask;
	248	struct algif_hash_tfm *tfm;
	249	struct sock *sk = sock->sk;
	250	struct alg_sock *ask = alg_sk(sk);
	251
	252	if (ask->refcnt)
	253	return 0;
	254
	255	psk = ask->parent;
	256	pask = alg_sk(ask->parent);
	257	tfm = pask->private;
	258
	259	err = -ENOKEY;
	260	lock_sock(psk);
	261	if (!tfm->has_key)
	262	goto unlock;
	263
	264	if (!pask->refcnt++)
	265	sock_hold(psk);
	266
	267	ask->refcnt = 1;
	268	sock_put(psk);
	269
	270	err = 0;
	271
	272	unlock:
	273	release_sock(psk);
	274
	275	return err;
	276	}
	277
	278	static int hash_sendmsg_nokey(struct socket sock, struct msghdr msg,
	279	size_t size)
	280	{
	281	int err;
	282
	283	err = hash_check_key(sock);
	284	if (err)
	285	return err;
	286
	287	return hash_sendmsg(sock, msg, size);
	288	}
	289
	290	static ssize_t hash_sendpage_nokey(struct socket sock, struct page page,
	291	int offset, size_t size, int flags)
	292	{
	293	int err;
	294
	295	err = hash_check_key(sock);
	296	if (err)
	297	return err;
	298
	299	return hash_sendpage(sock, page, offset, size, flags);
	300	}
	301
	302	static int hash_recvmsg_nokey(struct socket sock, struct msghdr msg,
	303	size_t ignored, int flags)
	304	{
	305	int err;
	306
307	err = hash_check_key(sock);
308	if (err)
309	return err;
310
311	return hash_recvmsg(sock, msg, ignored, flags);
312	}
313
314	static int hash_accept_nokey(struct socket sock, struct socket newsock,
315	int flags)
316	{
317	int err;
318
319	err = hash_check_key(sock);
320	if (err)
321	return err;
322
323	return hash_accept(sock, newsock, flags);
324	}
325
326	static struct proto_ops algif_hash_ops_nokey = {
327	.family = PF_ALG,
328
329	.connect = sock_no_connect,
330	.socketpair = sock_no_socketpair,
331	.getname = sock_no_getname,
332	.ioctl = sock_no_ioctl,
333	.listen = sock_no_listen,
334	.shutdown = sock_no_shutdown,
335	.getsockopt = sock_no_getsockopt,
336	.mmap = sock_no_mmap,
337	.bind = sock_no_bind,
338	.setsockopt = sock_no_setsockopt,
339	.poll = sock_no_poll,
340
341	.release = af_alg_release,
342	.sendmsg = hash_sendmsg_nokey,
343	.sendpage = hash_sendpage_nokey,
344	.recvmsg = hash_recvmsg_nokey,
345	.accept = hash_accept_nokey,
346	};
347
fe869cdb HX	348	static void hash_bind(const char name, u32 type, u32 mask)
fe869cdb HX	349	{
6de62f15 HX	350	struct algif_hash_tfm *tfm;
	351	struct crypto_ahash *hash;
	352
	353	tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
	354	if (!tfm)
	355	return ERR_PTR(-ENOMEM);
	356
	357	hash = crypto_alloc_ahash(name, type, mask);
	358	if (IS_ERR(hash)) {
	359	kfree(tfm);
	360	return ERR_CAST(hash);
	361	}
	362
	363	tfm->hash = hash;
	364
	365	return tfm;
fe869cdb HX	366	}
	367
	368	static void hash_release(void *private)
	369	{
6de62f15 HX	370	struct algif_hash_tfm *tfm = private;
	371
	372	crypto_free_ahash(tfm->hash);
	373	kfree(tfm);
fe869cdb HX	374	}
	375
	376	static int hash_setkey(void private, const u8 key, unsigned int keylen)
	377	{
6de62f15 HX	378	struct algif_hash_tfm *tfm = private;
	379	int err;
	380
	381	err = crypto_ahash_setkey(tfm->hash, key, keylen);
	382	tfm->has_key = !err;
	383
	384	return err;
fe869cdb HX	385	}
fe869cdb HX	386
6de62f15	387	static void hash_sock_destruct_common(struct sock *sk)
fe869cdb HX	388	{
	389	struct alg_sock *ask = alg_sk(sk);
	390	struct hash_ctx *ctx = ask->private;
	391
79e88659 DB	392	sock_kzfree_s(sk, ctx->result,
79e88659 DB	393	crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
fe869cdb	394	sock_kfree_s(sk, ctx, ctx->len);
6de62f15 HX	395	}
	396
	397	static void hash_sock_destruct(struct sock *sk)
	398	{
	399	hash_sock_destruct_common(sk);
fe869cdb HX	400	af_alg_release_parent(sk);
	401	}
	402
6de62f15 HX	403	static void hash_release_parent_nokey(struct sock *sk)
	404	{
	405	struct alg_sock *ask = alg_sk(sk);
	406
	407	if (!ask->refcnt) {
	408	sock_put(ask->parent);
	409	return;
	410	}
	411
	412	af_alg_release_parent(sk);
	413	}
	414
	415	static void hash_sock_destruct_nokey(struct sock *sk)
	416	{
	417	hash_sock_destruct_common(sk);
	418	hash_release_parent_nokey(sk);
	419	}
	420
	421	static int hash_accept_parent_common(void private, struct sock sk)
fe869cdb HX	422	{
	423	struct hash_ctx *ctx;
	424	struct alg_sock *ask = alg_sk(sk);
6de62f15 HX	425	struct algif_hash_tfm *tfm = private;
	426	struct crypto_ahash *hash = tfm->hash;
	427	unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
	428	unsigned ds = crypto_ahash_digestsize(hash);
fe869cdb HX	429
	430	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	431	if (!ctx)
	432	return -ENOMEM;
	433
	434	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
	435	if (!ctx->result) {
	436	sock_kfree_s(sk, ctx, len);
	437	return -ENOMEM;
	438	}
	439
	440	memset(ctx->result, 0, ds);
	441
	442	ctx->len = len;
	443	ctx->more = 0;
	444	af_alg_init_completion(&ctx->completion);
	445
	446	ask->private = ctx;
	447
6de62f15	448	ahash_request_set_tfm(&ctx->req, hash);
fe869cdb HX	449	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
	450	af_alg_complete, &ctx->completion);
	451
	452	sk->sk_destruct = hash_sock_destruct;
	453
	454	return 0;
	455	}
	456
6de62f15 HX	457	static int hash_accept_parent(void private, struct sock sk)
	458	{
	459	struct algif_hash_tfm *tfm = private;
	460
	461	if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
	462	return -ENOKEY;
	463
	464	return hash_accept_parent_common(private, sk);
	465	}
	466
	467	static int hash_accept_parent_nokey(void private, struct sock sk)
	468	{
	469	int err;
	470
	471	err = hash_accept_parent_common(private, sk);
	472	if (err)
	473	goto out;
	474
	475	sk->sk_destruct = hash_sock_destruct_nokey;
	476
	477	out:
	478	return err;
	479	}
	480
fe869cdb HX	481	static const struct af_alg_type algif_type_hash = {
	482	.bind = hash_bind,
	483	.release = hash_release,
	484	.setkey = hash_setkey,
	485	.accept = hash_accept_parent,
6de62f15	486	.accept_nokey = hash_accept_parent_nokey,
fe869cdb	487	.ops = &algif_hash_ops,
6de62f15	488	.ops_nokey = &algif_hash_ops_nokey,
fe869cdb HX	489	.name = "hash",
	490	.owner = THIS_MODULE
	491	};
	492
	493	static int __init algif_hash_init(void)
	494	{
	495	return af_alg_register_type(&algif_type_hash);
	496	}
	497
	498	static void __exit algif_hash_exit(void)
	499	{
	500	int err = af_alg_unregister_type(&algif_type_hash);
	501	BUG_ON(err);
	502	}
	503
	504	module_init(algif_hash_init);
	505	module_exit(algif_hash_exit);
	506	MODULE_LICENSE("GPL");