[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 af_alg_completion completion;

	unsigned int len;
	bool more;

	struct ahash_request req;
};

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;
	int err;

	err = crypto_ahash_export(req, state);
	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 = 1;

	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 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;

	sock_kzfree_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(void *private, struct sock *sk)
{
	struct hash_ctx *ctx;
	struct alg_sock *ask = alg_sk(sk);
	unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private);
	unsigned ds = crypto_ahash_digestsize(private);

	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, private);
	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 const struct af_alg_type algif_type_hash = {
	.bind		=	hash_bind,
	.release	=	hash_release,
	.setkey		=	hash_setkey,
	.accept		=	hash_accept_parent,
	.ops		=	&algif_hash_ops,
	.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
	29	struct af_alg_completion completion;
	30
	31	unsigned int len;
	32	bool more;
	33
	34	struct ahash_request req;
	35	};
	36
1b784140 YX	37	static int hash_sendmsg(struct socket sock, struct msghdr msg,
1b784140 YX	38	size_t ignored)
fe869cdb HX	39	{
	40	int limit = ALG_MAX_PAGES * PAGE_SIZE;
	41	struct sock *sk = sock->sk;
	42	struct alg_sock *ask = alg_sk(sk);
	43	struct hash_ctx *ctx = ask->private;
fe869cdb HX	44	long copied = 0;
	45	int err;
	46
	47	if (limit > sk->sk_sndbuf)
	48	limit = sk->sk_sndbuf;
	49
	50	lock_sock(sk);
	51	if (!ctx->more) {
	52	err = crypto_ahash_init(&ctx->req);
	53	if (err)
	54	goto unlock;
	55	}
	56
	57	ctx->more = 0;
	58
01e97e65 AV	59	while (msg_data_left(msg)) {
01e97e65 AV	60	int len = msg_data_left(msg);
fe869cdb	61
1d10eb2f AV	62	if (len > limit)
1d10eb2f AV	63	len = limit;
fe869cdb	64
1d10eb2f AV	65	len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
	66	if (len < 0) {
	67	err = copied ? 0 : len;
	68	goto unlock;
	69	}
fe869cdb	70
1d10eb2f	71	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
fe869cdb	72
1d10eb2f AV	73	err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
	74	&ctx->completion);
	75	af_alg_free_sg(&ctx->sgl);
	76	if (err)
	77	goto unlock;
fe869cdb	78
1d10eb2f AV	79	copied += len;
1d10eb2f AV	80	iov_iter_advance(&msg->msg_iter, len);
fe869cdb HX	81	}
	82
	83	err = 0;
	84
	85	ctx->more = msg->msg_flags & MSG_MORE;
	86	if (!ctx->more) {
	87	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	88	err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
	89	&ctx->completion);
	90	}
	91
	92	unlock:
	93	release_sock(sk);
	94
	95	return err ?: copied;
	96	}
	97
	98	static ssize_t hash_sendpage(struct socket sock, struct page page,
	99	int offset, size_t size, int flags)
	100	{
	101	struct sock *sk = sock->sk;
	102	struct alg_sock *ask = alg_sk(sk);
	103	struct hash_ctx *ctx = ask->private;
	104	int err;
	105
d3f7d56a SL	106	if (flags & MSG_SENDPAGE_NOTLAST)
	107	flags \|= MSG_MORE;
	108
fe869cdb HX	109	lock_sock(sk);
	110	sg_init_table(ctx->sgl.sg, 1);
	111	sg_set_page(ctx->sgl.sg, page, size, offset);
	112
	113	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
	114
	115	if (!(flags & MSG_MORE)) {
	116	if (ctx->more)
	117	err = crypto_ahash_finup(&ctx->req);
	118	else
	119	err = crypto_ahash_digest(&ctx->req);
	120	} else {
	121	if (!ctx->more) {
	122	err = crypto_ahash_init(&ctx->req);
	123	if (err)
	124	goto unlock;
	125	}
	126
	127	err = crypto_ahash_update(&ctx->req);
	128	}
	129
	130	err = af_alg_wait_for_completion(err, &ctx->completion);
	131	if (err)
	132	goto unlock;
	133
	134	ctx->more = flags & MSG_MORE;
	135
	136	unlock:
	137	release_sock(sk);
	138
	139	return err ?: size;
	140	}
	141
1b784140 YX	142	static int hash_recvmsg(struct socket sock, struct msghdr msg, size_t len,
1b784140 YX	143	int flags)
fe869cdb HX	144	{
	145	struct sock *sk = sock->sk;
	146	struct alg_sock *ask = alg_sk(sk);
	147	struct hash_ctx *ctx = ask->private;
	148	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	149	int err;
	150
	151	if (len > ds)
	152	len = ds;
	153	else if (len < ds)
	154	msg->msg_flags \|= MSG_TRUNC;
	155
	156	lock_sock(sk);
	157	if (ctx->more) {
	158	ctx->more = 0;
	159	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	160	err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
	161	&ctx->completion);
	162	if (err)
	163	goto unlock;
	164	}
	165
7eab8d9e	166	err = memcpy_to_msg(msg, ctx->result, len);
fe869cdb HX	167
	168	unlock:
	169	release_sock(sk);
	170
	171	return err ?: len;
	172	}
	173
	174	static int hash_accept(struct socket sock, struct socket newsock, int flags)
	175	{
	176	struct sock *sk = sock->sk;
	177	struct alg_sock *ask = alg_sk(sk);
	178	struct hash_ctx *ctx = ask->private;
	179	struct ahash_request *req = &ctx->req;
	180	char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
	181	struct sock *sk2;
	182	struct alg_sock *ask2;
	183	struct hash_ctx *ctx2;
	184	int err;
	185
	186	err = crypto_ahash_export(req, state);
	187	if (err)
	188	return err;
	189
	190	err = af_alg_accept(ask->parent, newsock);
	191	if (err)
	192	return err;
	193
	194	sk2 = newsock->sk;
	195	ask2 = alg_sk(sk2);
	196	ctx2 = ask2->private;
	197	ctx2->more = 1;
	198
	199	err = crypto_ahash_import(&ctx2->req, state);
	200	if (err) {
	201	sock_orphan(sk2);
	202	sock_put(sk2);
	203	}
	204
	205	return err;
	206	}
	207
	208	static struct proto_ops algif_hash_ops = {
	209	.family = PF_ALG,
	210
	211	.connect = sock_no_connect,
	212	.socketpair = sock_no_socketpair,
	213	.getname = sock_no_getname,
	214	.ioctl = sock_no_ioctl,
	215	.listen = sock_no_listen,
	216	.shutdown = sock_no_shutdown,
	217	.getsockopt = sock_no_getsockopt,
	218	.mmap = sock_no_mmap,
	219	.bind = sock_no_bind,
	220	.setsockopt = sock_no_setsockopt,
	221	.poll = sock_no_poll,
	222
	223	.release = af_alg_release,
	224	.sendmsg = hash_sendmsg,
	225	.sendpage = hash_sendpage,
	226	.recvmsg = hash_recvmsg,
	227	.accept = hash_accept,
	228	};
	229
	230	static void hash_bind(const char name, u32 type, u32 mask)
231	{
232	return crypto_alloc_ahash(name, type, mask);
233	}
234
235	static void hash_release(void *private)
236	{
237	crypto_free_ahash(private);
238	}
239
240	static int hash_setkey(void private, const u8 key, unsigned int keylen)
241	{
242	return crypto_ahash_setkey(private, key, keylen);
243	}
244
245	static void hash_sock_destruct(struct sock *sk)
246	{
247	struct alg_sock *ask = alg_sk(sk);
248	struct hash_ctx *ctx = ask->private;
249
79e88659 DB	250	sock_kzfree_s(sk, ctx->result,
79e88659 DB	251	crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
fe869cdb HX	252	sock_kfree_s(sk, ctx, ctx->len);
	253	af_alg_release_parent(sk);
	254	}
	255
	256	static int hash_accept_parent(void private, struct sock sk)
	257	{
	258	struct hash_ctx *ctx;
	259	struct alg_sock *ask = alg_sk(sk);
	260	unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private);
	261	unsigned ds = crypto_ahash_digestsize(private);
	262
	263	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	264	if (!ctx)
	265	return -ENOMEM;
	266
	267	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
	268	if (!ctx->result) {
	269	sock_kfree_s(sk, ctx, len);
	270	return -ENOMEM;
	271	}
	272
	273	memset(ctx->result, 0, ds);
	274
	275	ctx->len = len;
	276	ctx->more = 0;
	277	af_alg_init_completion(&ctx->completion);
	278
	279	ask->private = ctx;
	280
	281	ahash_request_set_tfm(&ctx->req, private);
	282	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
	283	af_alg_complete, &ctx->completion);
	284
	285	sk->sk_destruct = hash_sock_destruct;
	286
	287	return 0;
	288	}
	289
	290	static const struct af_alg_type algif_type_hash = {
	291	.bind = hash_bind,
	292	.release = hash_release,
	293	.setkey = hash_setkey,
	294	.accept = hash_accept_parent,
	295	.ops = &algif_hash_ops,
	296	.name = "hash",
	297	.owner = THIS_MODULE
	298	};
	299
	300	static int __init algif_hash_init(void)
	301	{
	302	return af_alg_register_type(&algif_type_hash);
	303	}
	304
	305	static void __exit algif_hash_exit(void)
	306	{
	307	int err = af_alg_unregister_type(&algif_type_hash);
	308	BUG_ON(err);
	309	}
	310
	311	module_init(algif_hash_init);
	312	module_exit(algif_hash_exit);
	313	MODULE_LICENSE("GPL");