[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 crypto_wait wait;

	unsigned int len;
	bool more;

	struct ahash_request req;
};

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

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 algif_hash_tfm *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 (!tfm->has_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)
{
	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(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 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);

	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, hash);
	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 algif_hash_tfm *tfm = private;

	if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
		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 <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
2c3f8b16	29	struct crypto_wait wait;
fe869cdb HX	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
493b2ed3 HX	42	static int hash_alloc_result(struct sock sk, struct hash_ctx ctx)
	43	{
	44	unsigned ds;
	45
	46	if (ctx->result)
	47	return 0;
	48
	49	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	50
	51	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
	52	if (!ctx->result)
	53	return -ENOMEM;
	54
	55	memset(ctx->result, 0, ds);
	56
	57	return 0;
	58	}
	59
	60	static void hash_free_result(struct sock sk, struct hash_ctx ctx)
	61	{
	62	unsigned ds;
	63
	64	if (!ctx->result)
	65	return;
	66
	67	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	68
	69	sock_kzfree_s(sk, ctx->result, ds);
	70	ctx->result = NULL;
	71	}
	72
1b784140 YX	73	static int hash_sendmsg(struct socket sock, struct msghdr msg,
1b784140 YX	74	size_t ignored)
fe869cdb HX	75	{
	76	int limit = ALG_MAX_PAGES * PAGE_SIZE;
	77	struct sock *sk = sock->sk;
	78	struct alg_sock *ask = alg_sk(sk);
	79	struct hash_ctx *ctx = ask->private;
fe869cdb HX	80	long copied = 0;
	81	int err;
	82
	83	if (limit > sk->sk_sndbuf)
	84	limit = sk->sk_sndbuf;
	85
	86	lock_sock(sk);
	87	if (!ctx->more) {
493b2ed3 HX	88	if ((msg->msg_flags & MSG_MORE))
	89	hash_free_result(sk, ctx);
	90
2c3f8b16	91	err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
fe869cdb HX	92	if (err)
	93	goto unlock;
	94	}
	95
	96	ctx->more = 0;
	97
01e97e65 AV	98	while (msg_data_left(msg)) {
01e97e65 AV	99	int len = msg_data_left(msg);
fe869cdb	100
1d10eb2f AV	101	if (len > limit)
1d10eb2f AV	102	len = limit;
fe869cdb	103
1d10eb2f AV	104	len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
	105	if (len < 0) {
	106	err = copied ? 0 : len;
	107	goto unlock;
	108	}
fe869cdb	109
1d10eb2f	110	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
fe869cdb	111
2c3f8b16 GBY	112	err = crypto_wait_req(crypto_ahash_update(&ctx->req),
2c3f8b16 GBY	113	&ctx->wait);
1d10eb2f AV	114	af_alg_free_sg(&ctx->sgl);
	115	if (err)
	116	goto unlock;
fe869cdb	117
1d10eb2f AV	118	copied += len;
1d10eb2f AV	119	iov_iter_advance(&msg->msg_iter, len);
fe869cdb HX	120	}
	121
	122	err = 0;
	123
	124	ctx->more = msg->msg_flags & MSG_MORE;
	125	if (!ctx->more) {
493b2ed3 HX	126	err = hash_alloc_result(sk, ctx);
	127	if (err)
	128	goto unlock;
	129
fe869cdb	130	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
2c3f8b16 GBY	131	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
2c3f8b16 GBY	132	&ctx->wait);
fe869cdb HX	133	}
	134
	135	unlock:
	136	release_sock(sk);
	137
	138	return err ?: copied;
	139	}
	140
	141	static ssize_t hash_sendpage(struct socket sock, struct page page,
	142	int offset, size_t size, int flags)
	143	{
	144	struct sock *sk = sock->sk;
	145	struct alg_sock *ask = alg_sk(sk);
	146	struct hash_ctx *ctx = ask->private;
	147	int err;
	148
d3f7d56a SL	149	if (flags & MSG_SENDPAGE_NOTLAST)
	150	flags \|= MSG_MORE;
	151
fe869cdb HX	152	lock_sock(sk);
	153	sg_init_table(ctx->sgl.sg, 1);
	154	sg_set_page(ctx->sgl.sg, page, size, offset);
	155
493b2ed3 HX	156	if (!(flags & MSG_MORE)) {
	157	err = hash_alloc_result(sk, ctx);
	158	if (err)
	159	goto unlock;
	160	} else if (!ctx->more)
	161	hash_free_result(sk, ctx);
	162
fe869cdb HX	163	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
	164
	165	if (!(flags & MSG_MORE)) {
	166	if (ctx->more)
	167	err = crypto_ahash_finup(&ctx->req);
	168	else
	169	err = crypto_ahash_digest(&ctx->req);
	170	} else {
	171	if (!ctx->more) {
	172	err = crypto_ahash_init(&ctx->req);
2c3f8b16	173	err = crypto_wait_req(err, &ctx->wait);
fe869cdb HX	174	if (err)
	175	goto unlock;
	176	}
	177
	178	err = crypto_ahash_update(&ctx->req);
	179	}
	180
2c3f8b16	181	err = crypto_wait_req(err, &ctx->wait);
fe869cdb HX	182	if (err)
	183	goto unlock;
	184
	185	ctx->more = flags & MSG_MORE;
	186
	187	unlock:
	188	release_sock(sk);
	189
	190	return err ?: size;
	191	}
	192
1b784140 YX	193	static int hash_recvmsg(struct socket sock, struct msghdr msg, size_t len,
1b784140 YX	194	int flags)
fe869cdb HX	195	{
	196	struct sock *sk = sock->sk;
	197	struct alg_sock *ask = alg_sk(sk);
	198	struct hash_ctx *ctx = ask->private;
	199	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
493b2ed3	200	bool result;
fe869cdb HX	201	int err;
	202
	203	if (len > ds)
	204	len = ds;
	205	else if (len < ds)
	206	msg->msg_flags \|= MSG_TRUNC;
	207
	208	lock_sock(sk);
493b2ed3 HX	209	result = ctx->result;
	210	err = hash_alloc_result(sk, ctx);
	211	if (err)
	212	goto unlock;
	213
	214	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	215
8acf7a10	216	if (!result && !ctx->more) {
2c3f8b16 GBY	217	err = crypto_wait_req(crypto_ahash_init(&ctx->req),
2c3f8b16 GBY	218	&ctx->wait);
a8348bca HX	219	if (err)
	220	goto unlock;
	221	}
	222
	223	if (!result \|\| ctx->more) {
fe869cdb	224	ctx->more = 0;
2c3f8b16 GBY	225	err = crypto_wait_req(crypto_ahash_final(&ctx->req),
2c3f8b16 GBY	226	&ctx->wait);
fe869cdb HX	227	if (err)
	228	goto unlock;
	229	}
	230
7eab8d9e	231	err = memcpy_to_msg(msg, ctx->result, len);
fe869cdb HX	232
fe869cdb HX	233	unlock:
a8348bca	234	hash_free_result(sk, ctx);
fe869cdb HX	235	release_sock(sk);
	236
	237	return err ?: len;
	238	}
	239
cdfbabfb DH	240	static int hash_accept(struct socket sock, struct socket newsock, int flags,
cdfbabfb DH	241	bool kern)
fe869cdb HX	242	{
	243	struct sock *sk = sock->sk;
	244	struct alg_sock *ask = alg_sk(sk);
	245	struct hash_ctx *ctx = ask->private;
	246	struct ahash_request *req = &ctx->req;
62071194	247	char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1];
fe869cdb HX	248	struct sock *sk2;
	249	struct alg_sock *ask2;
	250	struct hash_ctx *ctx2;
4afa5f96	251	bool more;
fe869cdb HX	252	int err;
fe869cdb HX	253
4afa5f96 HX	254	lock_sock(sk);
	255	more = ctx->more;
	256	err = more ? crypto_ahash_export(req, state) : 0;
	257	release_sock(sk);
	258
fe869cdb HX	259	if (err)
	260	return err;
	261
cdfbabfb	262	err = af_alg_accept(ask->parent, newsock, kern);
fe869cdb HX	263	if (err)
	264	return err;
	265
	266	sk2 = newsock->sk;
	267	ask2 = alg_sk(sk2);
	268	ctx2 = ask2->private;
4afa5f96 HX	269	ctx2->more = more;
	270
	271	if (!more)
	272	return err;
fe869cdb HX	273
	274	err = crypto_ahash_import(&ctx2->req, state);
	275	if (err) {
	276	sock_orphan(sk2);
	277	sock_put(sk2);
	278	}
	279
	280	return err;
	281	}
	282
	283	static struct proto_ops algif_hash_ops = {
	284	.family = PF_ALG,
	285
	286	.connect = sock_no_connect,
	287	.socketpair = sock_no_socketpair,
	288	.getname = sock_no_getname,
	289	.ioctl = sock_no_ioctl,
	290	.listen = sock_no_listen,
	291	.shutdown = sock_no_shutdown,
	292	.getsockopt = sock_no_getsockopt,
	293	.mmap = sock_no_mmap,
	294	.bind = sock_no_bind,
	295	.setsockopt = sock_no_setsockopt,
	296	.poll = sock_no_poll,
	297
	298	.release = af_alg_release,
	299	.sendmsg = hash_sendmsg,
	300	.sendpage = hash_sendpage,
	301	.recvmsg = hash_recvmsg,
	302	.accept = hash_accept,
	303	};
	304
6de62f15 HX	305	static int hash_check_key(struct socket *sock)
6de62f15 HX	306	{
ad46d7e3	307	int err = 0;
6de62f15 HX	308	struct sock *psk;
	309	struct alg_sock *pask;
	310	struct algif_hash_tfm *tfm;
	311	struct sock *sk = sock->sk;
	312	struct alg_sock *ask = alg_sk(sk);
	313
ad46d7e3	314	lock_sock(sk);
6de62f15	315	if (ask->refcnt)
ad46d7e3	316	goto unlock_child;
6de62f15 HX	317
	318	psk = ask->parent;
	319	pask = alg_sk(ask->parent);
	320	tfm = pask->private;
	321
	322	err = -ENOKEY;
ad46d7e3	323	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
6de62f15 HX	324	if (!tfm->has_key)
	325	goto unlock;
	326
	327	if (!pask->refcnt++)
	328	sock_hold(psk);
	329
	330	ask->refcnt = 1;
	331	sock_put(psk);
	332
	333	err = 0;
	334
	335	unlock:
	336	release_sock(psk);
ad46d7e3 HX	337	unlock_child:
ad46d7e3 HX	338	release_sock(sk);
6de62f15 HX	339
	340	return err;
	341	}
	342
	343	static int hash_sendmsg_nokey(struct socket sock, struct msghdr msg,
	344	size_t size)
	345	{
	346	int err;
	347
	348	err = hash_check_key(sock);
	349	if (err)
	350	return err;
	351
	352	return hash_sendmsg(sock, msg, size);
	353	}
	354
	355	static ssize_t hash_sendpage_nokey(struct socket sock, struct page page,
	356	int offset, size_t size, int flags)
	357	{
	358	int err;
	359
	360	err = hash_check_key(sock);
	361	if (err)
	362	return err;
	363
	364	return hash_sendpage(sock, page, offset, size, flags);
	365	}
	366
	367	static int hash_recvmsg_nokey(struct socket sock, struct msghdr msg,
	368	size_t ignored, int flags)
	369	{
	370	int err;
	371
	372	err = hash_check_key(sock);
	373	if (err)
	374	return err;
	375
	376	return hash_recvmsg(sock, msg, ignored, flags);
	377	}
	378
	379	static int hash_accept_nokey(struct socket sock, struct socket newsock,
cdfbabfb	380	int flags, bool kern)
6de62f15 HX	381	{
	382	int err;
	383
	384	err = hash_check_key(sock);
	385	if (err)
	386	return err;
	387
cdfbabfb	388	return hash_accept(sock, newsock, flags, kern);
6de62f15 HX	389	}
	390
	391	static struct proto_ops algif_hash_ops_nokey = {
	392	.family = PF_ALG,
	393
	394	.connect = sock_no_connect,
	395	.socketpair = sock_no_socketpair,
	396	.getname = sock_no_getname,
	397	.ioctl = sock_no_ioctl,
	398	.listen = sock_no_listen,
	399	.shutdown = sock_no_shutdown,
	400	.getsockopt = sock_no_getsockopt,
	401	.mmap = sock_no_mmap,
	402	.bind = sock_no_bind,
	403	.setsockopt = sock_no_setsockopt,
	404	.poll = sock_no_poll,
	405
	406	.release = af_alg_release,
	407	.sendmsg = hash_sendmsg_nokey,
	408	.sendpage = hash_sendpage_nokey,
	409	.recvmsg = hash_recvmsg_nokey,
	410	.accept = hash_accept_nokey,
	411	};
	412
fe869cdb HX	413	static void hash_bind(const char name, u32 type, u32 mask)
fe869cdb HX	414	{
6de62f15 HX	415	struct algif_hash_tfm *tfm;
	416	struct crypto_ahash *hash;
	417
	418	tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
	419	if (!tfm)
	420	return ERR_PTR(-ENOMEM);
	421
	422	hash = crypto_alloc_ahash(name, type, mask);
	423	if (IS_ERR(hash)) {
	424	kfree(tfm);
	425	return ERR_CAST(hash);
	426	}
	427
	428	tfm->hash = hash;
	429
	430	return tfm;
fe869cdb HX	431	}
	432
	433	static void hash_release(void *private)
	434	{
6de62f15 HX	435	struct algif_hash_tfm *tfm = private;
	436
	437	crypto_free_ahash(tfm->hash);
	438	kfree(tfm);
fe869cdb HX	439	}
	440
	441	static int hash_setkey(void private, const u8 key, unsigned int keylen)
	442	{
6de62f15 HX	443	struct algif_hash_tfm *tfm = private;
	444	int err;
	445
	446	err = crypto_ahash_setkey(tfm->hash, key, keylen);
	447	tfm->has_key = !err;
	448
	449	return err;
fe869cdb HX	450	}
fe869cdb HX	451
f1d84af1	452	static void hash_sock_destruct(struct sock *sk)
fe869cdb HX	453	{
	454	struct alg_sock *ask = alg_sk(sk);
	455	struct hash_ctx *ctx = ask->private;
	456
493b2ed3	457	hash_free_result(sk, ctx);
fe869cdb	458	sock_kfree_s(sk, ctx, ctx->len);
6de62f15 HX	459	af_alg_release_parent(sk);
	460	}
	461
f1d84af1	462	static int hash_accept_parent_nokey(void private, struct sock sk)
fe869cdb HX	463	{
	464	struct hash_ctx *ctx;
	465	struct alg_sock *ask = alg_sk(sk);
6de62f15 HX	466	struct algif_hash_tfm *tfm = private;
	467	struct crypto_ahash *hash = tfm->hash;
	468	unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
fe869cdb HX	469
	470	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	471	if (!ctx)
	472	return -ENOMEM;
	473
493b2ed3	474	ctx->result = NULL;
fe869cdb HX	475	ctx->len = len;
fe869cdb HX	476	ctx->more = 0;
2c3f8b16	477	crypto_init_wait(&ctx->wait);
fe869cdb HX	478
	479	ask->private = ctx;
	480
6de62f15	481	ahash_request_set_tfm(&ctx->req, hash);
fe869cdb	482	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
2c3f8b16	483	crypto_req_done, &ctx->wait);
fe869cdb HX	484
	485	sk->sk_destruct = hash_sock_destruct;
	486
	487	return 0;
	488	}
	489
6de62f15 HX	490	static int hash_accept_parent(void private, struct sock sk)
	491	{
	492	struct algif_hash_tfm *tfm = private;
	493
	494	if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
	495	return -ENOKEY;
	496
f1d84af1	497	return hash_accept_parent_nokey(private, sk);
6de62f15 HX	498	}
6de62f15 HX	499
fe869cdb HX	500	static const struct af_alg_type algif_type_hash = {
	501	.bind = hash_bind,
	502	.release = hash_release,
	503	.setkey = hash_setkey,
	504	.accept = hash_accept_parent,
6de62f15	505	.accept_nokey = hash_accept_parent_nokey,
fe869cdb	506	.ops = &algif_hash_ops,
6de62f15	507	.ops_nokey = &algif_hash_ops_nokey,
fe869cdb HX	508	.name = "hash",
	509	.owner = THIS_MODULE
	510	};
	511
	512	static int __init algif_hash_init(void)
	513	{
	514	return af_alg_register_type(&algif_type_hash);
	515	}
	516
	517	static void __exit algif_hash_exit(void)
	518	{
	519	int err = af_alg_unregister_type(&algif_type_hash);
	520	BUG_ON(err);
	521	}
	522
	523	module_init(algif_hash_init);
	524	module_exit(algif_hash_exit);
	525	MODULE_LICENSE("GPL");