[mirror_ubuntu-artful-kernel.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;
	if (type->ops_nokey)
		type->ops_nokey->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);

void af_alg_release_parent(struct sock *sk)
{
	struct alg_sock *ask = alg_sk(sk);
	bool last;

	sk = ask->parent;
	ask = alg_sk(sk);

	lock_sock(sk);
	last = !--ask->refcnt;
	release_sock(sk);

	if (last)
		sock_put(sk);
}
EXPORT_SYMBOL_GPL(af_alg_release_parent);

static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
	const u32 forbidden = CRYPTO_ALG_INTERNAL;
	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;
	int err;

	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 & ~forbidden,
			     sa->salg_mask & ~forbidden);
	if (IS_ERR(private)) {
		module_put(type->owner);
		return PTR_ERR(private);
	}

	err = -EBUSY;
	lock_sock(sk);
	if (ask->refcnt)
		goto unlock;

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

	err = 0;

unlock:
	release_sock(sk);

	alg_do_release(type, private);

	return err;
}

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 = -EBUSY;

	lock_sock(sk);
	if (ask->refcnt)
		goto unlock;

	type = ask->type;

	err = -ENOPROTOOPT;
	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;
	bool nokey;

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

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

	sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, 0);
	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);

	nokey = err == -ENOKEY;
	if (nokey && type->accept_nokey)
		err = type->accept_nokey(ask->private, sk2);

	if (err)
		goto unlock;

	sk2->sk_family = PF_ALG;

	if (nokey || !ask->refcnt++)
		sock_hold(sk);
	alg_sk(sk2)->parent = sk;
	alg_sk(sk2)->type = type;

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

	if (nokey)
		newsock->ops = type->ops_nokey;

	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, kern);
	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 <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;
37766586 HX	79	if (type->ops_nokey)
37766586 HX	80	type->ops_nokey->owner = THIS_MODULE;
03c8efc1 HX	81	node->type = type;
	82	list_add(&node->list, &alg_types);
	83	err = 0;
	84
	85	unlock:
	86	up_write(&alg_types_sem);
	87
	88	return err;
	89	}
	90	EXPORT_SYMBOL_GPL(af_alg_register_type);
	91
	92	int af_alg_unregister_type(const struct af_alg_type *type)
	93	{
	94	struct alg_type_list *node;
	95	int err = -ENOENT;
	96
	97	down_write(&alg_types_sem);
	98	list_for_each_entry(node, &alg_types, list) {
	99	if (strcmp(node->type->name, type->name))
	100	continue;
	101
	102	list_del(&node->list);
	103	kfree(node);
	104	err = 0;
	105	break;
	106	}
	107	up_write(&alg_types_sem);
	108
	109	return err;
	110	}
	111	EXPORT_SYMBOL_GPL(af_alg_unregister_type);
	112
	113	static void alg_do_release(const struct af_alg_type type, void private)
	114	{
	115	if (!type)
	116	return;
	117
	118	type->release(private);
	119	module_put(type->owner);
	120	}
	121
	122	int af_alg_release(struct socket *sock)
	123	{
	124	if (sock->sk)
	125	sock_put(sock->sk);
	126	return 0;
	127	}
	128	EXPORT_SYMBOL_GPL(af_alg_release);
	129
c840ac6a HX	130	void af_alg_release_parent(struct sock *sk)
	131	{
	132	struct alg_sock *ask = alg_sk(sk);
	133	bool last;
	134
	135	sk = ask->parent;
	136	ask = alg_sk(sk);
	137
	138	lock_sock(sk);
	139	last = !--ask->refcnt;
	140	release_sock(sk);
	141
	142	if (last)
	143	sock_put(sk);
	144	}
	145	EXPORT_SYMBOL_GPL(af_alg_release_parent);
	146
03c8efc1 HX	147	static int alg_bind(struct socket sock, struct sockaddr uaddr, int addr_len)
03c8efc1 HX	148	{
15539de5	149	const u32 forbidden = CRYPTO_ALG_INTERNAL;
03c8efc1 HX	150	struct sock *sk = sock->sk;
	151	struct alg_sock *ask = alg_sk(sk);
	152	struct sockaddr_alg sa = (void )uaddr;
	153	const struct af_alg_type *type;
	154	void *private;
c840ac6a	155	int err;
03c8efc1 HX	156
	157	if (sock->state == SS_CONNECTED)
	158	return -EINVAL;
	159
	160	if (addr_len != sizeof(*sa))
	161	return -EINVAL;
	162
	163	sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
	164	sa->salg_name[sizeof(sa->salg_name) - 1] = 0;
	165
	166	type = alg_get_type(sa->salg_type);
	167	if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) {
	168	request_module("algif-%s", sa->salg_type);
	169	type = alg_get_type(sa->salg_type);
	170	}
	171
	172	if (IS_ERR(type))
	173	return PTR_ERR(type);
	174
15539de5 HX	175	private = type->bind(sa->salg_name,
	176	sa->salg_feat & ~forbidden,
	177	sa->salg_mask & ~forbidden);
03c8efc1 HX	178	if (IS_ERR(private)) {
	179	module_put(type->owner);
	180	return PTR_ERR(private);
	181	}
	182
c840ac6a	183	err = -EBUSY;
03c8efc1	184	lock_sock(sk);
c840ac6a HX	185	if (ask->refcnt)
c840ac6a HX	186	goto unlock;
03c8efc1 HX	187
	188	swap(ask->type, type);
	189	swap(ask->private, private);
	190
c840ac6a HX	191	err = 0;
	192
	193	unlock:
03c8efc1 HX	194	release_sock(sk);
	195
	196	alg_do_release(type, private);
	197
c840ac6a	198	return err;
03c8efc1 HX	199	}
	200
	201	static int alg_setkey(struct sock sk, char __user ukey,
	202	unsigned int keylen)
	203	{
	204	struct alg_sock *ask = alg_sk(sk);
	205	const struct af_alg_type *type = ask->type;
	206	u8 *key;
	207	int err;
	208
	209	key = sock_kmalloc(sk, keylen, GFP_KERNEL);
	210	if (!key)
	211	return -ENOMEM;
	212
	213	err = -EFAULT;
	214	if (copy_from_user(key, ukey, keylen))
	215	goto out;
	216
	217	err = type->setkey(ask->private, key, keylen);
	218
	219	out:
ad202c8c	220	sock_kzfree_s(sk, key, keylen);
03c8efc1 HX	221
	222	return err;
	223	}
	224
	225	static int alg_setsockopt(struct socket *sock, int level, int optname,
	226	char __user *optval, unsigned int optlen)
	227	{
	228	struct sock *sk = sock->sk;
	229	struct alg_sock *ask = alg_sk(sk);
	230	const struct af_alg_type *type;
c840ac6a	231	int err = -EBUSY;
03c8efc1 HX	232
03c8efc1 HX	233	lock_sock(sk);
c840ac6a HX	234	if (ask->refcnt)
	235	goto unlock;
	236
03c8efc1 HX	237	type = ask->type;
03c8efc1 HX	238
c840ac6a	239	err = -ENOPROTOOPT;
03c8efc1 HX	240	if (level != SOL_ALG \|\| !type)
	241	goto unlock;
	242
	243	switch (optname) {
	244	case ALG_SET_KEY:
	245	if (sock->state == SS_CONNECTED)
	246	goto unlock;
	247	if (!type->setkey)
	248	goto unlock;
	249
	250	err = alg_setkey(sk, optval, optlen);
25fb8638 SM	251	break;
	252	case ALG_SET_AEAD_AUTHSIZE:
	253	if (sock->state == SS_CONNECTED)
	254	goto unlock;
	255	if (!type->setauthsize)
	256	goto unlock;
	257	err = type->setauthsize(ask->private, optlen);
03c8efc1 HX	258	}
	259
	260	unlock:
	261	release_sock(sk);
	262
	263	return err;
	264	}
	265
	266	int af_alg_accept(struct sock sk, struct socket newsock)
	267	{
	268	struct alg_sock *ask = alg_sk(sk);
	269	const struct af_alg_type *type;
	270	struct sock *sk2;
	271	int err;
37766586	272	bool nokey;
03c8efc1 HX	273
	274	lock_sock(sk);
	275	type = ask->type;
	276
	277	err = -EINVAL;
	278	if (!type)
	279	goto unlock;
	280
11aa9c28	281	sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, 0);
03c8efc1 HX	282	err = -ENOMEM;
	283	if (!sk2)
	284	goto unlock;
	285
	286	sock_init_data(newsock, sk2);
507cad35	287	sock_graft(sk2, newsock);
4c63f83c	288	security_sk_clone(sk, sk2);
03c8efc1 HX	289
03c8efc1 HX	290	err = type->accept(ask->private, sk2);
37766586 HX	291
	292	nokey = err == -ENOKEY;
	293	if (nokey && type->accept_nokey)
	294	err = type->accept_nokey(ask->private, sk2);
	295
a383292c	296	if (err)
03c8efc1	297	goto unlock;
03c8efc1 HX	298
	299	sk2->sk_family = PF_ALG;
	300
37766586	301	if (nokey \|\| !ask->refcnt++)
c840ac6a	302	sock_hold(sk);
03c8efc1 HX	303	alg_sk(sk2)->parent = sk;
	304	alg_sk(sk2)->type = type;
	305
	306	newsock->ops = type->ops;
	307	newsock->state = SS_CONNECTED;
	308
37766586 HX	309	if (nokey)
	310	newsock->ops = type->ops_nokey;
	311
03c8efc1 HX	312	err = 0;
	313
	314	unlock:
	315	release_sock(sk);
	316
	317	return err;
	318	}
	319	EXPORT_SYMBOL_GPL(af_alg_accept);
	320
	321	static int alg_accept(struct socket sock, struct socket newsock, int flags)
	322	{
	323	return af_alg_accept(sock->sk, newsock);
	324	}
	325
	326	static const struct proto_ops alg_proto_ops = {
	327	.family = PF_ALG,
	328	.owner = THIS_MODULE,
	329
	330	.connect = sock_no_connect,
	331	.socketpair = sock_no_socketpair,
	332	.getname = sock_no_getname,
	333	.ioctl = sock_no_ioctl,
	334	.listen = sock_no_listen,
	335	.shutdown = sock_no_shutdown,
	336	.getsockopt = sock_no_getsockopt,
	337	.mmap = sock_no_mmap,
	338	.sendpage = sock_no_sendpage,
	339	.sendmsg = sock_no_sendmsg,
	340	.recvmsg = sock_no_recvmsg,
	341	.poll = sock_no_poll,
	342
	343	.bind = alg_bind,
	344	.release = af_alg_release,
	345	.setsockopt = alg_setsockopt,
	346	.accept = alg_accept,
	347	};
	348
	349	static void alg_sock_destruct(struct sock *sk)
	350	{
	351	struct alg_sock *ask = alg_sk(sk);
	352
	353	alg_do_release(ask->type, ask->private);
	354	}
	355
	356	static int alg_create(struct net net, struct socket sock, int protocol,
	357	int kern)
	358	{
	359	struct sock *sk;
	360	int err;
	361
	362	if (sock->type != SOCK_SEQPACKET)
	363	return -ESOCKTNOSUPPORT;
	364	if (protocol != 0)
	365	return -EPROTONOSUPPORT;
	366
	367	err = -ENOMEM;
11aa9c28	368	sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto, kern);
03c8efc1 HX	369	if (!sk)
	370	goto out;
	371
	372	sock->ops = &alg_proto_ops;
	373	sock_init_data(sock, sk);
	374
	375	sk->sk_family = PF_ALG;
	376	sk->sk_destruct = alg_sock_destruct;
	377
	378	return 0;
	379	out:
	380	return err;
	381	}
	382
	383	static const struct net_proto_family alg_family = {
	384	.family = PF_ALG,
	385	.create = alg_create,
	386	.owner = THIS_MODULE,
	387	};
	388
1d10eb2f	389	int af_alg_make_sg(struct af_alg_sgl sgl, struct iov_iter iter, int len)
03c8efc1	390	{
1d10eb2f AV	391	size_t off;
	392	ssize_t n;
	393	int npages, i;
03c8efc1	394
1d10eb2f AV	395	n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
	396	if (n < 0)
	397	return n;
03c8efc1	398
9399f0c5	399	npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;
03c8efc1	400	if (WARN_ON(npages == 0))
1d10eb2f	401	return -EINVAL;
66db3739 TS	402	/* Add one extra for linking */
66db3739 TS	403	sg_init_table(sgl->sg, npages + 1);
03c8efc1	404
1d10eb2f	405	for (i = 0, len = n; i < npages; i++) {
03c8efc1 HX	406	int plen = min_t(int, len, PAGE_SIZE - off);
	407
	408	sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
	409
	410	off = 0;
	411	len -= plen;
03c8efc1	412	}
66db3739 TS	413	sg_mark_end(sgl->sg + npages - 1);
	414	sgl->npages = npages;
	415
1d10eb2f	416	return n;
03c8efc1 HX	417	}
	418	EXPORT_SYMBOL_GPL(af_alg_make_sg);
	419
66db3739 TS	420	void af_alg_link_sg(struct af_alg_sgl sgl_prev, struct af_alg_sgl sgl_new)
	421	{
	422	sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
	423	sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
	424	}
bd507520	425	EXPORT_SYMBOL_GPL(af_alg_link_sg);
66db3739	426
03c8efc1 HX	427	void af_alg_free_sg(struct af_alg_sgl *sgl)
	428	{
	429	int i;
	430
66db3739	431	for (i = 0; i < sgl->npages; i++)
03c8efc1	432	put_page(sgl->pages[i]);
03c8efc1 HX	433	}
	434	EXPORT_SYMBOL_GPL(af_alg_free_sg);
	435
	436	int af_alg_cmsg_send(struct msghdr msg, struct af_alg_control con)
	437	{
	438	struct cmsghdr *cmsg;
	439
f95b414e	440	for_each_cmsghdr(cmsg, msg) {
03c8efc1 HX	441	if (!CMSG_OK(msg, cmsg))
	442	return -EINVAL;
	443	if (cmsg->cmsg_level != SOL_ALG)
	444	continue;
	445
267c4221	446	switch (cmsg->cmsg_type) {
03c8efc1 HX	447	case ALG_SET_IV:
	448	if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
	449	return -EINVAL;
	450	con->iv = (void *)CMSG_DATA(cmsg);
	451	if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
	452	sizeof(*con->iv)))
	453	return -EINVAL;
	454	break;
	455
	456	case ALG_SET_OP:
	457	if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
	458	return -EINVAL;
	459	con->op = (u32 )CMSG_DATA(cmsg);
	460	break;
	461
af8e8073 SM	462	case ALG_SET_AEAD_ASSOCLEN:
	463	if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
	464	return -EINVAL;
	465	con->aead_assoclen = (u32 )CMSG_DATA(cmsg);
	466	break;
	467
03c8efc1 HX	468	default:
	469	return -EINVAL;
	470	}
	471	}
	472
	473	return 0;
	474	}
	475	EXPORT_SYMBOL_GPL(af_alg_cmsg_send);
	476
	477	int af_alg_wait_for_completion(int err, struct af_alg_completion *completion)
	478	{
	479	switch (err) {
	480	case -EINPROGRESS:
	481	case -EBUSY:
	482	wait_for_completion(&completion->completion);
16735d02	483	reinit_completion(&completion->completion);
03c8efc1 HX	484	err = completion->err;
	485	break;
	486	};
	487
	488	return err;
	489	}
	490	EXPORT_SYMBOL_GPL(af_alg_wait_for_completion);
	491
	492	void af_alg_complete(struct crypto_async_request *req, int err)
	493	{
	494	struct af_alg_completion *completion = req->data;
	495
7e77bdeb RV	496	if (err == -EINPROGRESS)
	497	return;
	498
03c8efc1 HX	499	completion->err = err;
	500	complete(&completion->completion);
	501	}
	502	EXPORT_SYMBOL_GPL(af_alg_complete);
	503
	504	static int __init af_alg_init(void)
	505	{
	506	int err = proto_register(&alg_proto, 0);
	507
	508	if (err)
	509	goto out;
	510
	511	err = sock_register(&alg_family);
	512	if (err != 0)
	513	goto out_unregister_proto;
	514
	515	out:
	516	return err;
	517
	518	out_unregister_proto:
	519	proto_unregister(&alg_proto);
	520	goto out;
	521	}
	522
	523	static void __exit af_alg_exit(void)
	524	{
	525	sock_unregister(PF_ALG);
	526	proto_unregister(&alg_proto);
	527	}
	528
	529	module_init(af_alg_init);
	530	module_exit(af_alg_exit);
	531	MODULE_LICENSE("GPL");
	532	MODULE_ALIAS_NETPROTO(AF_ALG);