[GitHub/mt8127/android_kernel_alcatel_ttab.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 kiocb *unused, 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;
	unsigned long iovlen;
	struct iovec *iov;
	long copied = 0;
	int err;

	if (limit > sk->sk_sndbuf)
		limit = sk->sk_sndbuf;

	lock_sock(sk);
	if (!ctx->more) {
		err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
						&ctx->completion);
		if (err)
			goto unlock;
	}

	ctx->more = 0;

	for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0;
	     iovlen--, iov++) {
		unsigned long seglen = iov->iov_len;
		char __user *from = iov->iov_base;

		while (seglen) {
			int len = min_t(unsigned long, seglen, limit);
			int newlen;

			newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
			if (newlen < 0) {
				err = copied ? 0 : newlen;
				goto unlock;
			}

			ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
						newlen);

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

			af_alg_free_sg(&ctx->sgl);

			if (err)
				goto unlock;

			seglen -= newlen;
			from += newlen;
			copied += newlen;
		}
	}

	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);
			err = af_alg_wait_for_completion(err, &ctx->completion);
			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 kiocb *unused, 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_toiovec(msg->msg_iov, 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)) ? : 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);
	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 kiocb *unused, struct socket *sock,
			      struct msghdr *msg, size_t size)
{
	int err;

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

	return hash_sendmsg(unused, 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 kiocb *unused, 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(unused, 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(struct sock *sk)
{
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;

	sock_kfree_s(sk, ctx->result,
		     crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
	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);
	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_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
	29	struct af_alg_completion completion;
	30
	31	unsigned int len;
	32	bool more;
	33
	34	struct ahash_request req;
	35	};
	36
85529752 HX	37	struct algif_hash_tfm {
	38	struct crypto_ahash *hash;
	39	bool has_key;
	40	};
	41
fe869cdb HX	42	static int hash_sendmsg(struct kiocb unused, struct socket sock,
	43	struct msghdr *msg, size_t ignored)
	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;
	49	unsigned long iovlen;
	50	struct iovec *iov;
	51	long copied = 0;
	52	int err;
	53
	54	if (limit > sk->sk_sndbuf)
	55	limit = sk->sk_sndbuf;
	56
	57	lock_sock(sk);
	58	if (!ctx->more) {
9250afa4 WR	59	err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
9250afa4 WR	60	&ctx->completion);
fe869cdb HX	61	if (err)
	62	goto unlock;
	63	}
	64
	65	ctx->more = 0;
	66
	67	for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0;
	68	iovlen--, iov++) {
	69	unsigned long seglen = iov->iov_len;
	70	char __user *from = iov->iov_base;
	71
	72	while (seglen) {
	73	int len = min_t(unsigned long, seglen, limit);
	74	int newlen;
	75
	76	newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
269230e7 HX	77	if (newlen < 0) {
269230e7 HX	78	err = copied ? 0 : newlen;
fe869cdb	79	goto unlock;
269230e7	80	}
fe869cdb HX	81
	82	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
	83	newlen);
	84
	85	err = af_alg_wait_for_completion(
	86	crypto_ahash_update(&ctx->req),
	87	&ctx->completion);
	88
	89	af_alg_free_sg(&ctx->sgl);
	90
	91	if (err)
	92	goto unlock;
	93
	94	seglen -= newlen;
	95	from += newlen;
	96	copied += newlen;
	97	}
	98	}
	99
	100	err = 0;
	101
	102	ctx->more = msg->msg_flags & MSG_MORE;
	103	if (!ctx->more) {
	104	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	105	err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
	106	&ctx->completion);
	107	}
	108
	109	unlock:
	110	release_sock(sk);
	111
	112	return err ?: copied;
	113	}
	114
	115	static ssize_t hash_sendpage(struct socket sock, struct page page,
	116	int offset, size_t size, int flags)
	117	{
	118	struct sock *sk = sock->sk;
	119	struct alg_sock *ask = alg_sk(sk);
	120	struct hash_ctx *ctx = ask->private;
	121	int err;
	122
86a24344 SL	123	if (flags & MSG_SENDPAGE_NOTLAST)
	124	flags \|= MSG_MORE;
	125
fe869cdb HX	126	lock_sock(sk);
	127	sg_init_table(ctx->sgl.sg, 1);
	128	sg_set_page(ctx->sgl.sg, page, size, offset);
	129
	130	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
	131
	132	if (!(flags & MSG_MORE)) {
	133	if (ctx->more)
	134	err = crypto_ahash_finup(&ctx->req);
	135	else
	136	err = crypto_ahash_digest(&ctx->req);
	137	} else {
	138	if (!ctx->more) {
	139	err = crypto_ahash_init(&ctx->req);
9250afa4	140	err = af_alg_wait_for_completion(err, &ctx->completion);
fe869cdb HX	141	if (err)
	142	goto unlock;
	143	}
	144
	145	err = crypto_ahash_update(&ctx->req);
	146	}
	147
	148	err = af_alg_wait_for_completion(err, &ctx->completion);
	149	if (err)
	150	goto unlock;
	151
	152	ctx->more = flags & MSG_MORE;
	153
	154	unlock:
	155	release_sock(sk);
	156
	157	return err ?: size;
	158	}
	159
	160	static int hash_recvmsg(struct kiocb unused, struct socket sock,
	161	struct msghdr *msg, size_t len, int flags)
	162	{
	163	struct sock *sk = sock->sk;
	164	struct alg_sock *ask = alg_sk(sk);
	165	struct hash_ctx *ctx = ask->private;
	166	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	167	int err;
	168
	169	if (len > ds)
	170	len = ds;
	171	else if (len < ds)
	172	msg->msg_flags \|= MSG_TRUNC;
	173
	174	lock_sock(sk);
	175	if (ctx->more) {
	176	ctx->more = 0;
	177	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	178	err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
	179	&ctx->completion);
	180	if (err)
	181	goto unlock;
	182	}
	183
	184	err = memcpy_toiovec(msg->msg_iov, ctx->result, len);
	185
	186	unlock:
	187	release_sock(sk);
	188
	189	return err ?: len;
	190	}
	191
	192	static int hash_accept(struct socket sock, struct socket newsock, int flags)
	193	{
	194	struct sock *sk = sock->sk;
	195	struct alg_sock *ask = alg_sk(sk);
	196	struct hash_ctx *ctx = ask->private;
	197	struct ahash_request *req = &ctx->req;
0907dbed	198	char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1];
fe869cdb HX	199	struct sock *sk2;
	200	struct alg_sock *ask2;
	201	struct hash_ctx *ctx2;
daaf3fd9	202	bool more;
fe869cdb HX	203	int err;
fe869cdb HX	204
daaf3fd9 HX	205	lock_sock(sk);
	206	more = ctx->more;
	207	err = more ? crypto_ahash_export(req, state) : 0;
	208	release_sock(sk);
	209
fe869cdb HX	210	if (err)
	211	return err;
	212
	213	err = af_alg_accept(ask->parent, newsock);
	214	if (err)
	215	return err;
	216
	217	sk2 = newsock->sk;
	218	ask2 = alg_sk(sk2);
	219	ctx2 = ask2->private;
daaf3fd9 HX	220	ctx2->more = more;
	221
	222	if (!more)
	223	return err;
fe869cdb HX	224
	225	err = crypto_ahash_import(&ctx2->req, state);
	226	if (err) {
	227	sock_orphan(sk2);
	228	sock_put(sk2);
	229	}
	230
	231	return err;
	232	}
	233
	234	static struct proto_ops algif_hash_ops = {
	235	.family = PF_ALG,
	236
	237	.connect = sock_no_connect,
	238	.socketpair = sock_no_socketpair,
	239	.getname = sock_no_getname,
	240	.ioctl = sock_no_ioctl,
	241	.listen = sock_no_listen,
	242	.shutdown = sock_no_shutdown,
	243	.getsockopt = sock_no_getsockopt,
	244	.mmap = sock_no_mmap,
	245	.bind = sock_no_bind,
	246	.setsockopt = sock_no_setsockopt,
	247	.poll = sock_no_poll,
	248
	249	.release = af_alg_release,
	250	.sendmsg = hash_sendmsg,
	251	.sendpage = hash_sendpage,
	252	.recvmsg = hash_recvmsg,
	253	.accept = hash_accept,
	254	};
	255
85529752 HX	256	static int hash_check_key(struct socket *sock)
85529752 HX	257	{
54541dc3	258	int err = 0;
85529752 HX	259	struct sock *psk;
	260	struct alg_sock *pask;
	261	struct algif_hash_tfm *tfm;
	262	struct sock *sk = sock->sk;
	263	struct alg_sock *ask = alg_sk(sk);
	264
54541dc3	265	lock_sock(sk);
85529752	266	if (ask->refcnt)
54541dc3	267	goto unlock_child;
85529752 HX	268
	269	psk = ask->parent;
	270	pask = alg_sk(ask->parent);
	271	tfm = pask->private;
	272
	273	err = -ENOKEY;
54541dc3	274	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
85529752 HX	275	if (!tfm->has_key)
	276	goto unlock;
	277
	278	if (!pask->refcnt++)
	279	sock_hold(psk);
	280
	281	ask->refcnt = 1;
	282	sock_put(psk);
	283
	284	err = 0;
	285
	286	unlock:
	287	release_sock(psk);
54541dc3 HX	288	unlock_child:
54541dc3 HX	289	release_sock(sk);
85529752 HX	290
	291	return err;
	292	}
	293
	294	static int hash_sendmsg_nokey(struct kiocb unused, struct socket sock,
	295	struct msghdr *msg, size_t size)
	296	{
	297	int err;
	298
	299	err = hash_check_key(sock);
	300	if (err)
	301	return err;
	302
	303	return hash_sendmsg(unused, sock, msg, size);
	304	}
	305
	306	static ssize_t hash_sendpage_nokey(struct socket sock, struct page page,
	307	int offset, size_t size, int flags)
	308	{
	309	int err;
	310
	311	err = hash_check_key(sock);
	312	if (err)
	313	return err;
	314
	315	return hash_sendpage(sock, page, offset, size, flags);
	316	}
	317
	318	static int hash_recvmsg_nokey(struct kiocb unused, struct socket sock,
	319	struct msghdr *msg, size_t ignored, int flags)
	320	{
	321	int err;
	322
	323	err = hash_check_key(sock);
	324	if (err)
	325	return err;
	326
	327	return hash_recvmsg(unused, sock, msg, ignored, flags);
	328	}
	329
	330	static int hash_accept_nokey(struct socket sock, struct socket newsock,
	331	int flags)
	332	{
	333	int err;
	334
	335	err = hash_check_key(sock);
	336	if (err)
	337	return err;
	338
	339	return hash_accept(sock, newsock, flags);
	340	}
	341
	342	static struct proto_ops algif_hash_ops_nokey = {
	343	.family = PF_ALG,
	344
	345	.connect = sock_no_connect,
	346	.socketpair = sock_no_socketpair,
	347	.getname = sock_no_getname,
	348	.ioctl = sock_no_ioctl,
	349	.listen = sock_no_listen,
	350	.shutdown = sock_no_shutdown,
	351	.getsockopt = sock_no_getsockopt,
	352	.mmap = sock_no_mmap,
	353	.bind = sock_no_bind,
354	.setsockopt = sock_no_setsockopt,
355	.poll = sock_no_poll,
356
357	.release = af_alg_release,
358	.sendmsg = hash_sendmsg_nokey,
359	.sendpage = hash_sendpage_nokey,
360	.recvmsg = hash_recvmsg_nokey,
361	.accept = hash_accept_nokey,
362	};
363
fe869cdb HX	364	static void hash_bind(const char name, u32 type, u32 mask)
fe869cdb HX	365	{
85529752 HX	366	struct algif_hash_tfm *tfm;
	367	struct crypto_ahash *hash;
	368
	369	tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
	370	if (!tfm)
	371	return ERR_PTR(-ENOMEM);
	372
	373	hash = crypto_alloc_ahash(name, type, mask);
	374	if (IS_ERR(hash)) {
	375	kfree(tfm);
	376	return ERR_CAST(hash);
	377	}
	378
	379	tfm->hash = hash;
	380
	381	return tfm;
fe869cdb HX	382	}
	383
	384	static void hash_release(void *private)
	385	{
85529752 HX	386	struct algif_hash_tfm *tfm = private;
	387
	388	crypto_free_ahash(tfm->hash);
	389	kfree(tfm);
fe869cdb HX	390	}
	391
	392	static int hash_setkey(void private, const u8 key, unsigned int keylen)
	393	{
85529752 HX	394	struct algif_hash_tfm *tfm = private;
	395	int err;
	396
	397	err = crypto_ahash_setkey(tfm->hash, key, keylen);
	398	tfm->has_key = !err;
	399
	400	return err;
fe869cdb HX	401	}
fe869cdb HX	402
023fe7ba	403	static void hash_sock_destruct(struct sock *sk)
fe869cdb HX	404	{
	405	struct alg_sock *ask = alg_sk(sk);
	406	struct hash_ctx *ctx = ask->private;
	407
	408	sock_kfree_s(sk, ctx->result,
	409	crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
	410	sock_kfree_s(sk, ctx, ctx->len);
85529752 HX	411	af_alg_release_parent(sk);
	412	}
	413
023fe7ba	414	static int hash_accept_parent_nokey(void private, struct sock sk)
fe869cdb HX	415	{
	416	struct hash_ctx *ctx;
	417	struct alg_sock *ask = alg_sk(sk);
85529752 HX	418	struct algif_hash_tfm *tfm = private;
	419	struct crypto_ahash *hash = tfm->hash;
	420	unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
	421	unsigned ds = crypto_ahash_digestsize(hash);
fe869cdb HX	422
	423	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	424	if (!ctx)
	425	return -ENOMEM;
	426
	427	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
	428	if (!ctx->result) {
	429	sock_kfree_s(sk, ctx, len);
	430	return -ENOMEM;
	431	}
	432
	433	memset(ctx->result, 0, ds);
	434
	435	ctx->len = len;
	436	ctx->more = 0;
	437	af_alg_init_completion(&ctx->completion);
	438
	439	ask->private = ctx;
	440
85529752	441	ahash_request_set_tfm(&ctx->req, hash);
fe869cdb HX	442	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
	443	af_alg_complete, &ctx->completion);
	444
	445	sk->sk_destruct = hash_sock_destruct;
	446
	447	return 0;
	448	}
	449
85529752 HX	450	static int hash_accept_parent(void private, struct sock sk)
	451	{
	452	struct algif_hash_tfm *tfm = private;
	453
	454	if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
	455	return -ENOKEY;
	456
023fe7ba	457	return hash_accept_parent_nokey(private, sk);
85529752 HX	458	}
85529752 HX	459
fe869cdb HX	460	static const struct af_alg_type algif_type_hash = {
	461	.bind = hash_bind,
	462	.release = hash_release,
	463	.setkey = hash_setkey,
	464	.accept = hash_accept_parent,
85529752	465	.accept_nokey = hash_accept_parent_nokey,
fe869cdb	466	.ops = &algif_hash_ops,
85529752	467	.ops_nokey = &algif_hash_ops_nokey,
fe869cdb HX	468	.name = "hash",
	469	.owner = THIS_MODULE
	470	};
	471
	472	static int __init algif_hash_init(void)
	473	{
	474	return af_alg_register_type(&algif_type_hash);
	475	}
	476
	477	static void __exit algif_hash_exit(void)
	478	{
	479	int err = af_alg_unregister_type(&algif_type_hash);
	480	BUG_ON(err);
	481	}
	482
	483	module_init(algif_hash_init);
	484	module_exit(algif_hash_exit);
	485	MODULE_LICENSE("GPL");