[linux-2.6-block.git] / crypto / af_alg.c

/*
 * af_alg: User-space algorithm interface
 *
 * This file provides the user-space API for 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 <linux/atomic.h>
#include <crypto/if_alg.h>
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/rwsem.h>
#include <linux/security.h>

struct alg_type_list {
	const struct af_alg_type *type;
	struct list_head list;
};

static atomic_long_t alg_memory_allocated;

static struct proto alg_proto = {
	.name			= "ALG",
	.owner			= THIS_MODULE,
	.memory_allocated	= &alg_memory_allocated,
	.obj_size		= sizeof(struct alg_sock),
};

static LIST_HEAD(alg_types);
static DECLARE_RWSEM(alg_types_sem);

static const struct af_alg_type *alg_get_type(const char *name)
{
	const struct af_alg_type *type = ERR_PTR(-ENOENT);
	struct alg_type_list *node;

	down_read(&alg_types_sem);
	list_for_each_entry(node, &alg_types, list) {
		if (strcmp(node->type->name, name))
			continue;

		if (try_module_get(node->type->owner))
			type = node->type;
		break;
	}
	up_read(&alg_types_sem);

	return type;
}

int af_alg_register_type(const struct af_alg_type *type)
{
	struct alg_type_list *node;
	int err = -EEXIST;

	down_write(&alg_types_sem);
	list_for_each_entry(node, &alg_types, list) {
		if (!strcmp(node->type->name, type->name))
			goto unlock;
	}

	node = kmalloc(sizeof(*node), GFP_KERNEL);
	err = -ENOMEM;
	if (!node)
		goto unlock;

	type->ops->owner = THIS_MODULE;
	node->type = type;
	list_add(&node->list, &alg_types);
	err = 0;

unlock:
	up_write(&alg_types_sem);

	return err;
}
EXPORT_SYMBOL_GPL(af_alg_register_type);

int af_alg_unregister_type(const struct af_alg_type *type)
{
	struct alg_type_list *node;
	int err = -ENOENT;

	down_write(&alg_types_sem);
	list_for_each_entry(node, &alg_types, list) {
		if (strcmp(node->type->name, type->name))
			continue;

		list_del(&node->list);
		kfree(node);
		err = 0;
		break;
	}
	up_write(&alg_types_sem);

	return err;
}
EXPORT_SYMBOL_GPL(af_alg_unregister_type);

static void alg_do_release(const struct af_alg_type *type, void *private)
{
	if (!type)
		return;

	type->release(private);
	module_put(type->owner);
}

int af_alg_release(struct socket *sock)
{
	if (sock->sk)
		sock_put(sock->sk);
	return 0;
}
EXPORT_SYMBOL_GPL(af_alg_release);

static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	struct sockaddr_alg *sa = (void *)uaddr;
	const struct af_alg_type *type;
	void *private;

	if (sock->state == SS_CONNECTED)
		return -EINVAL;

	if (addr_len != sizeof(*sa))
		return -EINVAL;

	sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
	sa->salg_name[sizeof(sa->salg_name) - 1] = 0;

	type = alg_get_type(sa->salg_type);
	if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) {
		request_module("algif-%s", sa->salg_type);
		type = alg_get_type(sa->salg_type);
	}

	if (IS_ERR(type))
		return PTR_ERR(type);

	private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask);
	if (IS_ERR(private)) {
		module_put(type->owner);
		return PTR_ERR(private);
	}

	lock_sock(sk);

	swap(ask->type, type);
	swap(ask->private, private);

	release_sock(sk);

	alg_do_release(type, private);

	return 0;
}

static int alg_setkey(struct sock *sk, char __user *ukey,
		      unsigned int keylen)
{
	struct alg_sock *ask = alg_sk(sk);
	const struct af_alg_type *type = ask->type;
	u8 *key;
	int err;

	key = sock_kmalloc(sk, keylen, GFP_KERNEL);
	if (!key)
		return -ENOMEM;

	err = -EFAULT;
	if (copy_from_user(key, ukey, keylen))
		goto out;

	err = type->setkey(ask->private, key, keylen);

out:
	sock_kfree_s(sk, key, keylen);

	return err;
}

static int alg_setsockopt(struct socket *sock, int level, int optname,
			  char __user *optval, unsigned int optlen)
{
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	const struct af_alg_type *type;
	int err = -ENOPROTOOPT;

	lock_sock(sk);
	type = ask->type;

	if (level != SOL_ALG || !type)
		goto unlock;

	switch (optname) {
	case ALG_SET_KEY:
		if (sock->state == SS_CONNECTED)
			goto unlock;
		if (!type->setkey)
			goto unlock;

		err = alg_setkey(sk, optval, optlen);
	}

unlock:
	release_sock(sk);

	return err;
}

int af_alg_accept(struct sock *sk, struct socket *newsock)
{
	struct alg_sock *ask = alg_sk(sk);
	const struct af_alg_type *type;
	struct sock *sk2;
	int err;

	lock_sock(sk);
	type = ask->type;

	err = -EINVAL;
	if (!type)
		goto unlock;

	sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto);
	err = -ENOMEM;
	if (!sk2)
		goto unlock;

	sock_init_data(newsock, sk2);
	sock_graft(sk2, newsock);
	security_sk_clone(sk, sk2);

	err = type->accept(ask->private, sk2);
	if (err) {
		sk_free(sk2);
		goto unlock;
	}

	sk2->sk_family = PF_ALG;

	sock_hold(sk);
	alg_sk(sk2)->parent = sk;
	alg_sk(sk2)->type = type;

	newsock->ops = type->ops;
	newsock->state = SS_CONNECTED;

	err = 0;

unlock:
	release_sock(sk);

	return err;
}
EXPORT_SYMBOL_GPL(af_alg_accept);

static int alg_accept(struct socket *sock, struct socket *newsock, int flags)
{
	return af_alg_accept(sock->sk, newsock);
}

static const struct proto_ops alg_proto_ops = {
	.family		=	PF_ALG,
	.owner		=	THIS_MODULE,

	.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,
	.sendpage	=	sock_no_sendpage,
	.sendmsg	=	sock_no_sendmsg,
	.recvmsg	=	sock_no_recvmsg,
	.poll		=	sock_no_poll,

	.bind		=	alg_bind,
	.release	=	af_alg_release,
	.setsockopt	=	alg_setsockopt,
	.accept		=	alg_accept,
};

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

	alg_do_release(ask->type, ask->private);
}

static int alg_create(struct net *net, struct socket *sock, int protocol,
		      int kern)
{
	struct sock *sk;
	int err;

	if (sock->type != SOCK_SEQPACKET)
		return -ESOCKTNOSUPPORT;
	if (protocol != 0)
		return -EPROTONOSUPPORT;

	err = -ENOMEM;
	sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto);
	if (!sk)
		goto out;

	sock->ops = &alg_proto_ops;
	sock_init_data(sock, sk);

	sk->sk_family = PF_ALG;
	sk->sk_destruct = alg_sock_destruct;

	return 0;
out:
	return err;
}

static const struct net_proto_family alg_family = {
	.family	=	PF_ALG,
	.create	=	alg_create,
	.owner	=	THIS_MODULE,
};

int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
{
	size_t off;
	ssize_t n;
	int npages, i;

	n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
	if (n < 0)
		return n;

	npages = PAGE_ALIGN(off + n);
	if (WARN_ON(npages == 0))
		return -EINVAL;

	sg_init_table(sgl->sg, npages);

	for (i = 0, len = n; i < npages; i++) {
		int plen = min_t(int, len, PAGE_SIZE - off);

		sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);

		off = 0;
		len -= plen;
	}
	return n;
}
EXPORT_SYMBOL_GPL(af_alg_make_sg);

void af_alg_free_sg(struct af_alg_sgl *sgl)
{
	int i;

	i = 0;
	do {
		put_page(sgl->pages[i]);
	} while (!sg_is_last(sgl->sg + (i++)));
}
EXPORT_SYMBOL_GPL(af_alg_free_sg);

int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con)
{
	struct cmsghdr *cmsg;

	for_each_cmsghdr(cmsg, msg) {
		if (!CMSG_OK(msg, cmsg))
			return -EINVAL;
		if (cmsg->cmsg_level != SOL_ALG)
			continue;

		switch(cmsg->cmsg_type) {
		case ALG_SET_IV:
			if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
				return -EINVAL;
			con->iv = (void *)CMSG_DATA(cmsg);
			if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
						      sizeof(*con->iv)))
				return -EINVAL;
			break;

		case ALG_SET_OP:
			if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
				return -EINVAL;
			con->op = *(u32 *)CMSG_DATA(cmsg);
			break;

		case ALG_SET_AEAD_ASSOCLEN:
			if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
				return -EINVAL;
			con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg);
			break;

		default:
			return -EINVAL;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(af_alg_cmsg_send);

int af_alg_wait_for_completion(int err, struct af_alg_completion *completion)
{
	switch (err) {
	case -EINPROGRESS:
	case -EBUSY:
		wait_for_completion(&completion->completion);
		reinit_completion(&completion->completion);
		err = completion->err;
		break;
	};

	return err;
}
EXPORT_SYMBOL_GPL(af_alg_wait_for_completion);

void af_alg_complete(struct crypto_async_request *req, int err)
{
	struct af_alg_completion *completion = req->data;

	if (err == -EINPROGRESS)
		return;

	completion->err = err;
	complete(&completion->completion);
}
EXPORT_SYMBOL_GPL(af_alg_complete);

static int __init af_alg_init(void)
{
	int err = proto_register(&alg_proto, 0);

	if (err)
		goto out;

	err = sock_register(&alg_family);
	if (err != 0)
		goto out_unregister_proto;

out:
	return err;

out_unregister_proto:
	proto_unregister(&alg_proto);
	goto out;
}

static void __exit af_alg_exit(void)
{
	sock_unregister(PF_ALG);
	proto_unregister(&alg_proto);
}

module_init(af_alg_init);
module_exit(af_alg_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(AF_ALG);
Commit	Line	Data
03c8efc1 HX	1	/*
	2	* af_alg: User-space algorithm interface
	3	*
	4	* This file provides the user-space API for 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
60063497	15	#include <linux/atomic.h>
03c8efc1 HX	16	#include <crypto/if_alg.h>
	17	#include <linux/crypto.h>
	18	#include <linux/init.h>
	19	#include <linux/kernel.h>
	20	#include <linux/list.h>
	21	#include <linux/module.h>
	22	#include <linux/net.h>
	23	#include <linux/rwsem.h>
4c63f83c	24	#include <linux/security.h>
03c8efc1 HX	25
	26	struct alg_type_list {
	27	const struct af_alg_type *type;
	28	struct list_head list;
	29	};
	30
06869524	31	static atomic_long_t alg_memory_allocated;
03c8efc1 HX	32
	33	static struct proto alg_proto = {
	34	.name = "ALG",
	35	.owner = THIS_MODULE,
	36	.memory_allocated = &alg_memory_allocated,
	37	.obj_size = sizeof(struct alg_sock),
	38	};
	39
	40	static LIST_HEAD(alg_types);
	41	static DECLARE_RWSEM(alg_types_sem);
	42
	43	static const struct af_alg_type alg_get_type(const char name)
	44	{
	45	const struct af_alg_type *type = ERR_PTR(-ENOENT);
	46	struct alg_type_list *node;
	47
	48	down_read(&alg_types_sem);
	49	list_for_each_entry(node, &alg_types, list) {
	50	if (strcmp(node->type->name, name))
	51	continue;
	52
	53	if (try_module_get(node->type->owner))
	54	type = node->type;
	55	break;
	56	}
	57	up_read(&alg_types_sem);
	58
	59	return type;
	60	}
	61
	62	int af_alg_register_type(const struct af_alg_type *type)
	63	{
	64	struct alg_type_list *node;
	65	int err = -EEXIST;
	66
	67	down_write(&alg_types_sem);
	68	list_for_each_entry(node, &alg_types, list) {
	69	if (!strcmp(node->type->name, type->name))
	70	goto unlock;
	71	}
	72
	73	node = kmalloc(sizeof(*node), GFP_KERNEL);
	74	err = -ENOMEM;
	75	if (!node)
	76	goto unlock;
	77
	78	type->ops->owner = THIS_MODULE;
	79	node->type = type;
	80	list_add(&node->list, &alg_types);
	81	err = 0;
	82
	83	unlock:
	84	up_write(&alg_types_sem);
	85
	86	return err;
	87	}
	88	EXPORT_SYMBOL_GPL(af_alg_register_type);
	89
	90	int af_alg_unregister_type(const struct af_alg_type *type)
	91	{
	92	struct alg_type_list *node;
	93	int err = -ENOENT;
	94
	95	down_write(&alg_types_sem);
96	list_for_each_entry(node, &alg_types, list) {
97	if (strcmp(node->type->name, type->name))
98	continue;
99
100	list_del(&node->list);
101	kfree(node);
102	err = 0;
103	break;
104	}
105	up_write(&alg_types_sem);
106
107	return err;
108	}
109	EXPORT_SYMBOL_GPL(af_alg_unregister_type);
110
111	static void alg_do_release(const struct af_alg_type type, void private)
112	{
113	if (!type)
114	return;
115
116	type->release(private);
117	module_put(type->owner);
118	}
119
120	int af_alg_release(struct socket *sock)
121	{
122	if (sock->sk)
123	sock_put(sock->sk);
124	return 0;
125	}
126	EXPORT_SYMBOL_GPL(af_alg_release);
127
128	static int alg_bind(struct socket sock, struct sockaddr uaddr, int addr_len)
129	{
130	struct sock *sk = sock->sk;
131	struct alg_sock *ask = alg_sk(sk);
132	struct sockaddr_alg sa = (void )uaddr;
133	const struct af_alg_type *type;
134	void *private;
135
136	if (sock->state == SS_CONNECTED)
137	return -EINVAL;
138
139	if (addr_len != sizeof(*sa))
140	return -EINVAL;
141
142	sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
143	sa->salg_name[sizeof(sa->salg_name) - 1] = 0;
144
145	type = alg_get_type(sa->salg_type);
146	if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) {
147	request_module("algif-%s", sa->salg_type);
148	type = alg_get_type(sa->salg_type);
149	}
150
151	if (IS_ERR(type))
152	return PTR_ERR(type);
153
154	private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask);
155	if (IS_ERR(private)) {
156	module_put(type->owner);
157	return PTR_ERR(private);
158	}
159
160	lock_sock(sk);
161
162	swap(ask->type, type);
163	swap(ask->private, private);
164
165	release_sock(sk);
166
167	alg_do_release(type, private);
168
169	return 0;
170	}
171
172	static int alg_setkey(struct sock sk, char __user ukey,
173	unsigned int keylen)
174	{
175	struct alg_sock *ask = alg_sk(sk);
176	const struct af_alg_type *type = ask->type;
177	u8 *key;
178	int err;
179
180	key = sock_kmalloc(sk, keylen, GFP_KERNEL);
181	if (!key)
182	return -ENOMEM;
183
184	err = -EFAULT;
185	if (copy_from_user(key, ukey, keylen))
186	goto out;
187
188	err = type->setkey(ask->private, key, keylen);
189
190	out:
191	sock_kfree_s(sk, key, keylen);
192
193	return err;
194	}
195
196	static int alg_setsockopt(struct socket *sock, int level, int optname,
197	char __user *optval, unsigned int optlen)
198	{
199	struct sock *sk = sock->sk;
200	struct alg_sock *ask = alg_sk(sk);
201	const struct af_alg_type *type;
202	int err = -ENOPROTOOPT;
203
204	lock_sock(sk);
205	type = ask->type;
206
207	if (level != SOL_ALG \|\| !type)
208	goto unlock;
209
210	switch (optname) {
211	case ALG_SET_KEY:
212	if (sock->state == SS_CONNECTED)
213	goto unlock;
214	if (!type->setkey)
215	goto unlock;
216
217	err = alg_setkey(sk, optval, optlen);
218	}
219
220	unlock:
221	release_sock(sk);
222
223	return err;
224	}
225
226	int af_alg_accept(struct sock sk, struct socket newsock)
227	{
228	struct alg_sock *ask = alg_sk(sk);
229	const struct af_alg_type *type;
230	struct sock *sk2;
231	int err;
232
233	lock_sock(sk);
234	type = ask->type;
235
236	err = -EINVAL;
237	if (!type)
238	goto unlock;
239
240	sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto);
241	err = -ENOMEM;
242	if (!sk2)
243	goto unlock;
244
245	sock_init_data(newsock, sk2);
507cad35	246	sock_graft(sk2, newsock);
4c63f83c	247	security_sk_clone(sk, sk2);
03c8efc1 HX	248
	249	err = type->accept(ask->private, sk2);
	250	if (err) {
	251	sk_free(sk2);
	252	goto unlock;
	253	}
	254
	255	sk2->sk_family = PF_ALG;
	256
	257	sock_hold(sk);
	258	alg_sk(sk2)->parent = sk;
	259	alg_sk(sk2)->type = type;
	260
	261	newsock->ops = type->ops;
	262	newsock->state = SS_CONNECTED;
	263
	264	err = 0;
	265
	266	unlock:
	267	release_sock(sk);
	268
	269	return err;
	270	}
	271	EXPORT_SYMBOL_GPL(af_alg_accept);
	272
	273	static int alg_accept(struct socket sock, struct socket newsock, int flags)
	274	{
	275	return af_alg_accept(sock->sk, newsock);
	276	}
	277
	278	static const struct proto_ops alg_proto_ops = {
	279	.family = PF_ALG,
	280	.owner = THIS_MODULE,
	281
	282	.connect = sock_no_connect,
	283	.socketpair = sock_no_socketpair,
	284	.getname = sock_no_getname,
	285	.ioctl = sock_no_ioctl,
	286	.listen = sock_no_listen,
	287	.shutdown = sock_no_shutdown,
	288	.getsockopt = sock_no_getsockopt,
	289	.mmap = sock_no_mmap,
	290	.sendpage = sock_no_sendpage,
	291	.sendmsg = sock_no_sendmsg,
	292	.recvmsg = sock_no_recvmsg,
	293	.poll = sock_no_poll,
	294
	295	.bind = alg_bind,
	296	.release = af_alg_release,
	297	.setsockopt = alg_setsockopt,
	298	.accept = alg_accept,
	299	};
	300
	301	static void alg_sock_destruct(struct sock *sk)
	302	{
	303	struct alg_sock *ask = alg_sk(sk);
	304
	305	alg_do_release(ask->type, ask->private);
	306	}
	307
	308	static int alg_create(struct net net, struct socket sock, int protocol,
	309	int kern)
	310	{
	311	struct sock *sk;
312	int err;
313
314	if (sock->type != SOCK_SEQPACKET)
315	return -ESOCKTNOSUPPORT;
316	if (protocol != 0)
317	return -EPROTONOSUPPORT;
318
319	err = -ENOMEM;
320	sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto);
321	if (!sk)
322	goto out;
323
324	sock->ops = &alg_proto_ops;
325	sock_init_data(sock, sk);
326
327	sk->sk_family = PF_ALG;
328	sk->sk_destruct = alg_sock_destruct;
329
330	return 0;
331	out:
332	return err;
333	}
334
335	static const struct net_proto_family alg_family = {
336	.family = PF_ALG,
337	.create = alg_create,
338	.owner = THIS_MODULE,
339	};
340
1d10eb2f	341	int af_alg_make_sg(struct af_alg_sgl sgl, struct iov_iter iter, int len)
03c8efc1	342	{
1d10eb2f AV	343	size_t off;
	344	ssize_t n;
	345	int npages, i;
03c8efc1	346
1d10eb2f AV	347	n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
	348	if (n < 0)
	349	return n;
03c8efc1	350
1d10eb2f	351	npages = PAGE_ALIGN(off + n);
03c8efc1	352	if (WARN_ON(npages == 0))
1d10eb2f	353	return -EINVAL;
03c8efc1 HX	354
	355	sg_init_table(sgl->sg, npages);
	356
1d10eb2f	357	for (i = 0, len = n; i < npages; i++) {
03c8efc1 HX	358	int plen = min_t(int, len, PAGE_SIZE - off);
	359
	360	sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
	361
	362	off = 0;
	363	len -= plen;
03c8efc1	364	}
1d10eb2f	365	return n;
03c8efc1 HX	366	}
	367	EXPORT_SYMBOL_GPL(af_alg_make_sg);
	368
	369	void af_alg_free_sg(struct af_alg_sgl *sgl)
	370	{
	371	int i;
	372
	373	i = 0;
	374	do {
	375	put_page(sgl->pages[i]);
	376	} while (!sg_is_last(sgl->sg + (i++)));
	377	}
	378	EXPORT_SYMBOL_GPL(af_alg_free_sg);
	379
	380	int af_alg_cmsg_send(struct msghdr msg, struct af_alg_control con)
	381	{
	382	struct cmsghdr *cmsg;
	383
f95b414e	384	for_each_cmsghdr(cmsg, msg) {
03c8efc1 HX	385	if (!CMSG_OK(msg, cmsg))
	386	return -EINVAL;
	387	if (cmsg->cmsg_level != SOL_ALG)
	388	continue;
	389
	390	switch(cmsg->cmsg_type) {
	391	case ALG_SET_IV:
	392	if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
	393	return -EINVAL;
	394	con->iv = (void *)CMSG_DATA(cmsg);
	395	if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
	396	sizeof(*con->iv)))
	397	return -EINVAL;
	398	break;
	399
	400	case ALG_SET_OP:
	401	if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
	402	return -EINVAL;
	403	con->op = (u32 )CMSG_DATA(cmsg);
	404	break;
	405
af8e8073 SM	406	case ALG_SET_AEAD_ASSOCLEN:
	407	if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
	408	return -EINVAL;
	409	con->aead_assoclen = (u32 )CMSG_DATA(cmsg);
	410	break;
	411
03c8efc1 HX	412	default:
	413	return -EINVAL;
	414	}
	415	}
	416
	417	return 0;
	418	}
	419	EXPORT_SYMBOL_GPL(af_alg_cmsg_send);
	420
	421	int af_alg_wait_for_completion(int err, struct af_alg_completion *completion)
	422	{
	423	switch (err) {
	424	case -EINPROGRESS:
	425	case -EBUSY:
	426	wait_for_completion(&completion->completion);
16735d02	427	reinit_completion(&completion->completion);
03c8efc1 HX	428	err = completion->err;
	429	break;
	430	};
	431
	432	return err;
	433	}
	434	EXPORT_SYMBOL_GPL(af_alg_wait_for_completion);
	435
	436	void af_alg_complete(struct crypto_async_request *req, int err)
	437	{
	438	struct af_alg_completion *completion = req->data;
	439
7e77bdeb RV	440	if (err == -EINPROGRESS)
	441	return;
	442
03c8efc1 HX	443	completion->err = err;
	444	complete(&completion->completion);
	445	}
	446	EXPORT_SYMBOL_GPL(af_alg_complete);
	447
	448	static int __init af_alg_init(void)
	449	{
	450	int err = proto_register(&alg_proto, 0);
	451
	452	if (err)
	453	goto out;
	454
	455	err = sock_register(&alg_family);
	456	if (err != 0)
	457	goto out_unregister_proto;
	458
	459	out:
	460	return err;
	461
	462	out_unregister_proto:
	463	proto_unregister(&alg_proto);
	464	goto out;
	465	}
	466
	467	static void __exit af_alg_exit(void)
	468	{
	469	sock_unregister(PF_ALG);
	470	proto_unregister(&alg_proto);
	471	}
	472
	473	module_init(af_alg_init);
	474	module_exit(af_alg_exit);
	475	MODULE_LICENSE("GPL");
	476	MODULE_ALIAS_NETPROTO(AF_ALG);