[linux.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 <[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 <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_kzfree_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);
		break;
	case ALG_SET_AEAD_AUTHSIZE:
		if (sock->state == SS_CONNECTED)
			goto unlock;
		if (!type->setauthsize)
			goto unlock;
		err = type->setauthsize(ask->private, 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 = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;
	if (WARN_ON(npages == 0))
		return -EINVAL;
	/* Add one extra for linking */
	sg_init_table(sgl->sg, npages + 1);

	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;
	}
	sg_mark_end(sgl->sg + npages - 1);
	sgl->npages = npages;

	return n;
}
EXPORT_SYMBOL_GPL(af_alg_make_sg);

void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new)
{
	sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
	sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
}
EXPORT_SYMBOL_GPL(af_alg_link_sg);

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

	for (i = 0; i < sgl->npages; i++)
		put_page(sgl->pages[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 <[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
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:
ad202c8c	191	sock_kzfree_s(sk, key, keylen);
03c8efc1 HX	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);
25fb8638 SM	218	break;
	219	case ALG_SET_AEAD_AUTHSIZE:
	220	if (sock->state == SS_CONNECTED)
	221	goto unlock;
	222	if (!type->setauthsize)
	223	goto unlock;
	224	err = type->setauthsize(ask->private, optlen);
03c8efc1 HX	225	}
	226
	227	unlock:
	228	release_sock(sk);
	229
	230	return err;
	231	}
	232
	233	int af_alg_accept(struct sock sk, struct socket newsock)
	234	{
	235	struct alg_sock *ask = alg_sk(sk);
	236	const struct af_alg_type *type;
	237	struct sock *sk2;
	238	int err;
	239
	240	lock_sock(sk);
	241	type = ask->type;
	242
	243	err = -EINVAL;
	244	if (!type)
	245	goto unlock;
	246
	247	sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto);
	248	err = -ENOMEM;
	249	if (!sk2)
	250	goto unlock;
	251
	252	sock_init_data(newsock, sk2);
507cad35	253	sock_graft(sk2, newsock);
4c63f83c	254	security_sk_clone(sk, sk2);
03c8efc1 HX	255
	256	err = type->accept(ask->private, sk2);
	257	if (err) {
	258	sk_free(sk2);
	259	goto unlock;
	260	}
	261
	262	sk2->sk_family = PF_ALG;
	263
	264	sock_hold(sk);
	265	alg_sk(sk2)->parent = sk;
	266	alg_sk(sk2)->type = type;
	267
	268	newsock->ops = type->ops;
	269	newsock->state = SS_CONNECTED;
	270
	271	err = 0;
	272
	273	unlock:
	274	release_sock(sk);
	275
	276	return err;
	277	}
	278	EXPORT_SYMBOL_GPL(af_alg_accept);
	279
	280	static int alg_accept(struct socket sock, struct socket newsock, int flags)
	281	{
	282	return af_alg_accept(sock->sk, newsock);
	283	}
	284
	285	static const struct proto_ops alg_proto_ops = {
	286	.family = PF_ALG,
	287	.owner = THIS_MODULE,
	288
	289	.connect = sock_no_connect,
	290	.socketpair = sock_no_socketpair,
	291	.getname = sock_no_getname,
	292	.ioctl = sock_no_ioctl,
	293	.listen = sock_no_listen,
	294	.shutdown = sock_no_shutdown,
	295	.getsockopt = sock_no_getsockopt,
	296	.mmap = sock_no_mmap,
	297	.sendpage = sock_no_sendpage,
	298	.sendmsg = sock_no_sendmsg,
	299	.recvmsg = sock_no_recvmsg,
	300	.poll = sock_no_poll,
	301
	302	.bind = alg_bind,
	303	.release = af_alg_release,
	304	.setsockopt = alg_setsockopt,
	305	.accept = alg_accept,
	306	};
	307
	308	static void alg_sock_destruct(struct sock *sk)
	309	{
	310	struct alg_sock *ask = alg_sk(sk);
	311
	312	alg_do_release(ask->type, ask->private);
	313	}
	314
	315	static int alg_create(struct net net, struct socket sock, int protocol,
	316	int kern)
	317	{
	318	struct sock *sk;
319	int err;
320
321	if (sock->type != SOCK_SEQPACKET)
322	return -ESOCKTNOSUPPORT;
323	if (protocol != 0)
324	return -EPROTONOSUPPORT;
325
326	err = -ENOMEM;
327	sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto);
328	if (!sk)
329	goto out;
330
331	sock->ops = &alg_proto_ops;
332	sock_init_data(sock, sk);
333
334	sk->sk_family = PF_ALG;
335	sk->sk_destruct = alg_sock_destruct;
336
337	return 0;
338	out:
339	return err;
340	}
341
342	static const struct net_proto_family alg_family = {
343	.family = PF_ALG,
344	.create = alg_create,
345	.owner = THIS_MODULE,
346	};
347
1d10eb2f	348	int af_alg_make_sg(struct af_alg_sgl sgl, struct iov_iter iter, int len)
03c8efc1	349	{
1d10eb2f AV	350	size_t off;
	351	ssize_t n;
	352	int npages, i;
03c8efc1	353
1d10eb2f AV	354	n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
	355	if (n < 0)
	356	return n;
03c8efc1	357
9399f0c5	358	npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;
03c8efc1	359	if (WARN_ON(npages == 0))
1d10eb2f	360	return -EINVAL;
66db3739 TS	361	/* Add one extra for linking */
66db3739 TS	362	sg_init_table(sgl->sg, npages + 1);
03c8efc1	363
1d10eb2f	364	for (i = 0, len = n; i < npages; i++) {
03c8efc1 HX	365	int plen = min_t(int, len, PAGE_SIZE - off);
	366
	367	sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
	368
	369	off = 0;
	370	len -= plen;
03c8efc1	371	}
66db3739 TS	372	sg_mark_end(sgl->sg + npages - 1);
	373	sgl->npages = npages;
	374
1d10eb2f	375	return n;
03c8efc1 HX	376	}
	377	EXPORT_SYMBOL_GPL(af_alg_make_sg);
	378
66db3739 TS	379	void af_alg_link_sg(struct af_alg_sgl sgl_prev, struct af_alg_sgl sgl_new)
	380	{
	381	sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
	382	sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
	383	}
bd507520	384	EXPORT_SYMBOL_GPL(af_alg_link_sg);
66db3739	385
03c8efc1 HX	386	void af_alg_free_sg(struct af_alg_sgl *sgl)
	387	{
	388	int i;
	389
66db3739	390	for (i = 0; i < sgl->npages; i++)
03c8efc1	391	put_page(sgl->pages[i]);
03c8efc1 HX	392	}
	393	EXPORT_SYMBOL_GPL(af_alg_free_sg);
	394
	395	int af_alg_cmsg_send(struct msghdr msg, struct af_alg_control con)
	396	{
	397	struct cmsghdr *cmsg;
	398
f95b414e	399	for_each_cmsghdr(cmsg, msg) {
03c8efc1 HX	400	if (!CMSG_OK(msg, cmsg))
	401	return -EINVAL;
	402	if (cmsg->cmsg_level != SOL_ALG)
	403	continue;
	404
267c4221	405	switch (cmsg->cmsg_type) {
03c8efc1 HX	406	case ALG_SET_IV:
	407	if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
	408	return -EINVAL;
	409	con->iv = (void *)CMSG_DATA(cmsg);
	410	if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
	411	sizeof(*con->iv)))
	412	return -EINVAL;
	413	break;
	414
	415	case ALG_SET_OP:
	416	if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
	417	return -EINVAL;
	418	con->op = (u32 )CMSG_DATA(cmsg);
	419	break;
	420
af8e8073 SM	421	case ALG_SET_AEAD_ASSOCLEN:
	422	if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
	423	return -EINVAL;
	424	con->aead_assoclen = (u32 )CMSG_DATA(cmsg);
	425	break;
	426
03c8efc1 HX	427	default:
	428	return -EINVAL;
	429	}
	430	}
	431
	432	return 0;
	433	}
	434	EXPORT_SYMBOL_GPL(af_alg_cmsg_send);
	435
	436	int af_alg_wait_for_completion(int err, struct af_alg_completion *completion)
	437	{
	438	switch (err) {
	439	case -EINPROGRESS:
	440	case -EBUSY:
	441	wait_for_completion(&completion->completion);
16735d02	442	reinit_completion(&completion->completion);
03c8efc1 HX	443	err = completion->err;
	444	break;
	445	};
	446
	447	return err;
	448	}
	449	EXPORT_SYMBOL_GPL(af_alg_wait_for_completion);
	450
	451	void af_alg_complete(struct crypto_async_request *req, int err)
	452	{
	453	struct af_alg_completion *completion = req->data;
	454
7e77bdeb RV	455	if (err == -EINPROGRESS)
	456	return;
	457
03c8efc1 HX	458	completion->err = err;
	459	complete(&completion->completion);
	460	}
	461	EXPORT_SYMBOL_GPL(af_alg_complete);
	462
	463	static int __init af_alg_init(void)
	464	{
	465	int err = proto_register(&alg_proto, 0);
	466
	467	if (err)
	468	goto out;
	469
	470	err = sock_register(&alg_family);
	471	if (err != 0)
	472	goto out_unregister_proto;
	473
	474	out:
	475	return err;
	476
	477	out_unregister_proto:
	478	proto_unregister(&alg_proto);
	479	goto out;
	480	}
	481
	482	static void __exit af_alg_exit(void)
	483	{
	484	sock_unregister(PF_ALG);
	485	proto_unregister(&alg_proto);
	486	}
	487
	488	module_init(af_alg_init);
	489	module_exit(af_alg_exit);
	490	MODULE_LICENSE("GPL");
	491	MODULE_ALIAS_NETPROTO(AF_ALG);