[linux.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 <[email protected]>
 *
 * 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 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 = 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 = 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 = 0;
		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[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1];
	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,
	.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 = 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,
	.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)
{
	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 = 0;
	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
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 <[email protected]>
	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
2c3f8b16	29	struct crypto_wait wait;
fe869cdb HX	30
	31	unsigned int len;
	32	bool more;
	33
	34	struct ahash_request req;
	35	};
	36
493b2ed3 HX	37	static int hash_alloc_result(struct sock sk, struct hash_ctx ctx)
	38	{
	39	unsigned ds;
	40
	41	if (ctx->result)
	42	return 0;
	43
	44	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	45
	46	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
	47	if (!ctx->result)
	48	return -ENOMEM;
	49
	50	memset(ctx->result, 0, ds);
	51
	52	return 0;
	53	}
	54
	55	static void hash_free_result(struct sock sk, struct hash_ctx ctx)
	56	{
	57	unsigned ds;
	58
	59	if (!ctx->result)
	60	return;
	61
	62	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	63
	64	sock_kzfree_s(sk, ctx->result, ds);
	65	ctx->result = NULL;
	66	}
	67
1b784140 YX	68	static int hash_sendmsg(struct socket sock, struct msghdr msg,
1b784140 YX	69	size_t ignored)
fe869cdb HX	70	{
	71	int limit = ALG_MAX_PAGES * PAGE_SIZE;
	72	struct sock *sk = sock->sk;
	73	struct alg_sock *ask = alg_sk(sk);
	74	struct hash_ctx *ctx = ask->private;
fe869cdb HX	75	long copied = 0;
	76	int err;
	77
	78	if (limit > sk->sk_sndbuf)
	79	limit = sk->sk_sndbuf;
	80
	81	lock_sock(sk);
	82	if (!ctx->more) {
493b2ed3 HX	83	if ((msg->msg_flags & MSG_MORE))
	84	hash_free_result(sk, ctx);
	85
2c3f8b16	86	err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
fe869cdb HX	87	if (err)
	88	goto unlock;
	89	}
	90
	91	ctx->more = 0;
	92
01e97e65 AV	93	while (msg_data_left(msg)) {
01e97e65 AV	94	int len = msg_data_left(msg);
fe869cdb	95
1d10eb2f AV	96	if (len > limit)
1d10eb2f AV	97	len = limit;
fe869cdb	98
1d10eb2f AV	99	len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
	100	if (len < 0) {
	101	err = copied ? 0 : len;
	102	goto unlock;
	103	}
fe869cdb	104
1d10eb2f	105	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
fe869cdb	106
2c3f8b16 GBY	107	err = crypto_wait_req(crypto_ahash_update(&ctx->req),
2c3f8b16 GBY	108	&ctx->wait);
1d10eb2f AV	109	af_alg_free_sg(&ctx->sgl);
	110	if (err)
	111	goto unlock;
fe869cdb	112
1d10eb2f AV	113	copied += len;
1d10eb2f AV	114	iov_iter_advance(&msg->msg_iter, len);
fe869cdb HX	115	}
	116
	117	err = 0;
	118
	119	ctx->more = msg->msg_flags & MSG_MORE;
	120	if (!ctx->more) {
493b2ed3 HX	121	err = hash_alloc_result(sk, ctx);
	122	if (err)
	123	goto unlock;
	124
fe869cdb	125	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
2c3f8b16 GBY	126	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
2c3f8b16 GBY	127	&ctx->wait);
fe869cdb HX	128	}
	129
	130	unlock:
	131	release_sock(sk);
	132
	133	return err ?: copied;
	134	}
	135
	136	static ssize_t hash_sendpage(struct socket sock, struct page page,
	137	int offset, size_t size, int flags)
	138	{
	139	struct sock *sk = sock->sk;
	140	struct alg_sock *ask = alg_sk(sk);
	141	struct hash_ctx *ctx = ask->private;
	142	int err;
	143
d3f7d56a SL	144	if (flags & MSG_SENDPAGE_NOTLAST)
	145	flags \|= MSG_MORE;
	146
fe869cdb HX	147	lock_sock(sk);
	148	sg_init_table(ctx->sgl.sg, 1);
	149	sg_set_page(ctx->sgl.sg, page, size, offset);
	150
493b2ed3 HX	151	if (!(flags & MSG_MORE)) {
	152	err = hash_alloc_result(sk, ctx);
	153	if (err)
	154	goto unlock;
	155	} else if (!ctx->more)
	156	hash_free_result(sk, ctx);
	157
fe869cdb HX	158	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
	159
	160	if (!(flags & MSG_MORE)) {
	161	if (ctx->more)
	162	err = crypto_ahash_finup(&ctx->req);
	163	else
	164	err = crypto_ahash_digest(&ctx->req);
	165	} else {
	166	if (!ctx->more) {
	167	err = crypto_ahash_init(&ctx->req);
2c3f8b16	168	err = crypto_wait_req(err, &ctx->wait);
fe869cdb HX	169	if (err)
	170	goto unlock;
	171	}
	172
	173	err = crypto_ahash_update(&ctx->req);
	174	}
	175
2c3f8b16	176	err = crypto_wait_req(err, &ctx->wait);
fe869cdb HX	177	if (err)
	178	goto unlock;
	179
	180	ctx->more = flags & MSG_MORE;
	181
	182	unlock:
	183	release_sock(sk);
	184
	185	return err ?: size;
	186	}
	187
1b784140 YX	188	static int hash_recvmsg(struct socket sock, struct msghdr msg, size_t len,
1b784140 YX	189	int flags)
fe869cdb HX	190	{
	191	struct sock *sk = sock->sk;
	192	struct alg_sock *ask = alg_sk(sk);
	193	struct hash_ctx *ctx = ask->private;
	194	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
493b2ed3	195	bool result;
fe869cdb HX	196	int err;
	197
	198	if (len > ds)
	199	len = ds;
	200	else if (len < ds)
	201	msg->msg_flags \|= MSG_TRUNC;
	202
	203	lock_sock(sk);
493b2ed3 HX	204	result = ctx->result;
	205	err = hash_alloc_result(sk, ctx);
	206	if (err)
	207	goto unlock;
	208
	209	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	210
8acf7a10	211	if (!result && !ctx->more) {
2c3f8b16 GBY	212	err = crypto_wait_req(crypto_ahash_init(&ctx->req),
2c3f8b16 GBY	213	&ctx->wait);
a8348bca HX	214	if (err)
	215	goto unlock;
	216	}
	217
	218	if (!result \|\| ctx->more) {
fe869cdb	219	ctx->more = 0;
2c3f8b16 GBY	220	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
2c3f8b16 GBY	221	&ctx->wait);
fe869cdb HX	222	if (err)
	223	goto unlock;
	224	}
	225
7eab8d9e	226	err = memcpy_to_msg(msg, ctx->result, len);
fe869cdb HX	227
fe869cdb HX	228	unlock:
a8348bca	229	hash_free_result(sk, ctx);
fe869cdb HX	230	release_sock(sk);
	231
	232	return err ?: len;
	233	}
	234
cdfbabfb DH	235	static int hash_accept(struct socket sock, struct socket newsock, int flags,
cdfbabfb DH	236	bool kern)
fe869cdb HX	237	{
	238	struct sock *sk = sock->sk;
	239	struct alg_sock *ask = alg_sk(sk);
	240	struct hash_ctx *ctx = ask->private;
	241	struct ahash_request *req = &ctx->req;
62071194	242	char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1];
fe869cdb HX	243	struct sock *sk2;
	244	struct alg_sock *ask2;
	245	struct hash_ctx *ctx2;
4afa5f96	246	bool more;
fe869cdb HX	247	int err;
fe869cdb HX	248
4afa5f96 HX	249	lock_sock(sk);
	250	more = ctx->more;
	251	err = more ? crypto_ahash_export(req, state) : 0;
	252	release_sock(sk);
	253
fe869cdb HX	254	if (err)
	255	return err;
	256
cdfbabfb	257	err = af_alg_accept(ask->parent, newsock, kern);
fe869cdb HX	258	if (err)
	259	return err;
	260
	261	sk2 = newsock->sk;
	262	ask2 = alg_sk(sk2);
	263	ctx2 = ask2->private;
4afa5f96 HX	264	ctx2->more = more;
	265
	266	if (!more)
	267	return err;
fe869cdb HX	268
	269	err = crypto_ahash_import(&ctx2->req, state);
	270	if (err) {
	271	sock_orphan(sk2);
	272	sock_put(sk2);
	273	}
	274
	275	return err;
	276	}
	277
	278	static struct proto_ops algif_hash_ops = {
	279	.family = PF_ALG,
	280
	281	.connect = sock_no_connect,
	282	.socketpair = sock_no_socketpair,
	283	.getname = sock_no_getname,
	284	.ioctl = sock_no_ioctl,
	285	.listen = sock_no_listen,
	286	.shutdown = sock_no_shutdown,
	287	.getsockopt = sock_no_getsockopt,
	288	.mmap = sock_no_mmap,
	289	.bind = sock_no_bind,
	290	.setsockopt = sock_no_setsockopt,
	291	.poll = sock_no_poll,
	292
	293	.release = af_alg_release,
	294	.sendmsg = hash_sendmsg,
	295	.sendpage = hash_sendpage,
	296	.recvmsg = hash_recvmsg,
	297	.accept = hash_accept,
	298	};
	299
6de62f15 HX	300	static int hash_check_key(struct socket *sock)
6de62f15 HX	301	{
ad46d7e3	302	int err = 0;
6de62f15 HX	303	struct sock *psk;
6de62f15 HX	304	struct alg_sock *pask;
9fa68f62	305	struct crypto_ahash *tfm;
6de62f15 HX	306	struct sock *sk = sock->sk;
	307	struct alg_sock *ask = alg_sk(sk);
	308
ad46d7e3	309	lock_sock(sk);
6de62f15	310	if (ask->refcnt)
ad46d7e3	311	goto unlock_child;
6de62f15 HX	312
	313	psk = ask->parent;
	314	pask = alg_sk(ask->parent);
	315	tfm = pask->private;
	316
	317	err = -ENOKEY;
ad46d7e3	318	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
9fa68f62	319	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
6de62f15 HX	320	goto unlock;
	321
	322	if (!pask->refcnt++)
	323	sock_hold(psk);
	324
	325	ask->refcnt = 1;
	326	sock_put(psk);
	327
	328	err = 0;
	329
	330	unlock:
	331	release_sock(psk);
ad46d7e3 HX	332	unlock_child:
ad46d7e3 HX	333	release_sock(sk);
6de62f15 HX	334
	335	return err;
	336	}
	337
	338	static int hash_sendmsg_nokey(struct socket sock, struct msghdr msg,
	339	size_t size)
	340	{
	341	int err;
	342
	343	err = hash_check_key(sock);
	344	if (err)
	345	return err;
	346
	347	return hash_sendmsg(sock, msg, size);
	348	}
	349
	350	static ssize_t hash_sendpage_nokey(struct socket sock, struct page page,
	351	int offset, size_t size, int flags)
	352	{
	353	int err;
	354
	355	err = hash_check_key(sock);
	356	if (err)
	357	return err;
	358
	359	return hash_sendpage(sock, page, offset, size, flags);
	360	}
	361
	362	static int hash_recvmsg_nokey(struct socket sock, struct msghdr msg,
	363	size_t ignored, int flags)
	364	{
	365	int err;
	366
	367	err = hash_check_key(sock);
	368	if (err)
	369	return err;
	370
	371	return hash_recvmsg(sock, msg, ignored, flags);
	372	}
	373
	374	static int hash_accept_nokey(struct socket sock, struct socket newsock,
cdfbabfb	375	int flags, bool kern)
6de62f15 HX	376	{
	377	int err;
	378
	379	err = hash_check_key(sock);
	380	if (err)
	381	return err;
	382
cdfbabfb	383	return hash_accept(sock, newsock, flags, kern);
6de62f15 HX	384	}
	385
	386	static struct proto_ops algif_hash_ops_nokey = {
	387	.family = PF_ALG,
	388
	389	.connect = sock_no_connect,
	390	.socketpair = sock_no_socketpair,
	391	.getname = sock_no_getname,
	392	.ioctl = sock_no_ioctl,
	393	.listen = sock_no_listen,
	394	.shutdown = sock_no_shutdown,
	395	.getsockopt = sock_no_getsockopt,
	396	.mmap = sock_no_mmap,
	397	.bind = sock_no_bind,
	398	.setsockopt = sock_no_setsockopt,
	399	.poll = sock_no_poll,
	400
	401	.release = af_alg_release,
	402	.sendmsg = hash_sendmsg_nokey,
	403	.sendpage = hash_sendpage_nokey,
	404	.recvmsg = hash_recvmsg_nokey,
	405	.accept = hash_accept_nokey,
	406	};
	407
fe869cdb HX	408	static void hash_bind(const char name, u32 type, u32 mask)
fe869cdb HX	409	{
9fa68f62	410	return crypto_alloc_ahash(name, type, mask);
fe869cdb HX	411	}
	412
	413	static void hash_release(void *private)
	414	{
9fa68f62	415	crypto_free_ahash(private);
fe869cdb HX	416	}
	417
	418	static int hash_setkey(void private, const u8 key, unsigned int keylen)
	419	{
9fa68f62	420	return crypto_ahash_setkey(private, key, keylen);
fe869cdb HX	421	}
fe869cdb HX	422
f1d84af1	423	static void hash_sock_destruct(struct sock *sk)
fe869cdb HX	424	{
	425	struct alg_sock *ask = alg_sk(sk);
	426	struct hash_ctx *ctx = ask->private;
	427
493b2ed3	428	hash_free_result(sk, ctx);
fe869cdb	429	sock_kfree_s(sk, ctx, ctx->len);
6de62f15 HX	430	af_alg_release_parent(sk);
	431	}
	432
f1d84af1	433	static int hash_accept_parent_nokey(void private, struct sock sk)
fe869cdb	434	{
9fa68f62	435	struct crypto_ahash *tfm = private;
fe869cdb	436	struct alg_sock *ask = alg_sk(sk);
9fa68f62 EB	437	struct hash_ctx *ctx;
9fa68f62 EB	438	unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
fe869cdb HX	439
	440	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	441	if (!ctx)
	442	return -ENOMEM;
	443
493b2ed3	444	ctx->result = NULL;
fe869cdb HX	445	ctx->len = len;
fe869cdb HX	446	ctx->more = 0;
2c3f8b16	447	crypto_init_wait(&ctx->wait);
fe869cdb HX	448
	449	ask->private = ctx;
	450
9fa68f62	451	ahash_request_set_tfm(&ctx->req, tfm);
fe869cdb	452	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
2c3f8b16	453	crypto_req_done, &ctx->wait);
fe869cdb HX	454
	455	sk->sk_destruct = hash_sock_destruct;
	456
	457	return 0;
	458	}
	459
6de62f15 HX	460	static int hash_accept_parent(void private, struct sock sk)
6de62f15 HX	461	{
9fa68f62	462	struct crypto_ahash *tfm = private;
6de62f15	463
9fa68f62	464	if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
6de62f15 HX	465	return -ENOKEY;
6de62f15 HX	466
f1d84af1	467	return hash_accept_parent_nokey(private, sk);
6de62f15 HX	468	}
6de62f15 HX	469
fe869cdb HX	470	static const struct af_alg_type algif_type_hash = {
	471	.bind = hash_bind,
	472	.release = hash_release,
	473	.setkey = hash_setkey,
	474	.accept = hash_accept_parent,
6de62f15	475	.accept_nokey = hash_accept_parent_nokey,
fe869cdb	476	.ops = &algif_hash_ops,
6de62f15	477	.ops_nokey = &algif_hash_ops_nokey,
fe869cdb HX	478	.name = "hash",
	479	.owner = THIS_MODULE
	480	};
	481
	482	static int __init algif_hash_init(void)
	483	{
	484	return af_alg_register_type(&algif_type_hash);
	485	}
	486
	487	static void __exit algif_hash_exit(void)
	488	{
	489	int err = af_alg_unregister_type(&algif_type_hash);
	490	BUG_ON(err);
	491	}
	492
	493	module_init(algif_hash_init);
	494	module_exit(algif_hash_exit);
	495	MODULE_LICENSE("GPL");