[people/arne_f/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;

	if (ask->nokey_refcnt && !ask->refcnt) {
		sock_put(sk);
		return;
	}

	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;
	unsigned int nokey;
	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, 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;
	alg_sk(sk2)->nokey_refcnt = nokey;

	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;
6a935170 HX	136
	137	if (ask->nokey_refcnt && !ask->refcnt) {
	138	sock_put(sk);
	139	return;
	140	}
	141
c840ac6a HX	142	ask = alg_sk(sk);
	143
	144	lock_sock(sk);
	145	last = !--ask->refcnt;
	146	release_sock(sk);
	147
	148	if (last)
	149	sock_put(sk);
	150	}
	151	EXPORT_SYMBOL_GPL(af_alg_release_parent);
	152
03c8efc1 HX	153	static int alg_bind(struct socket sock, struct sockaddr uaddr, int addr_len)
03c8efc1 HX	154	{
15539de5	155	const u32 forbidden = CRYPTO_ALG_INTERNAL;
03c8efc1 HX	156	struct sock *sk = sock->sk;
	157	struct alg_sock *ask = alg_sk(sk);
	158	struct sockaddr_alg sa = (void )uaddr;
	159	const struct af_alg_type *type;
	160	void *private;
c840ac6a	161	int err;
03c8efc1 HX	162
	163	if (sock->state == SS_CONNECTED)
	164	return -EINVAL;
	165
	166	if (addr_len != sizeof(*sa))
	167	return -EINVAL;
	168
	169	sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
	170	sa->salg_name[sizeof(sa->salg_name) - 1] = 0;
	171
	172	type = alg_get_type(sa->salg_type);
	173	if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) {
	174	request_module("algif-%s", sa->salg_type);
	175	type = alg_get_type(sa->salg_type);
	176	}
	177
	178	if (IS_ERR(type))
	179	return PTR_ERR(type);
	180
15539de5 HX	181	private = type->bind(sa->salg_name,
	182	sa->salg_feat & ~forbidden,
	183	sa->salg_mask & ~forbidden);
03c8efc1 HX	184	if (IS_ERR(private)) {
	185	module_put(type->owner);
	186	return PTR_ERR(private);
	187	}
	188
c840ac6a	189	err = -EBUSY;
03c8efc1	190	lock_sock(sk);
c840ac6a HX	191	if (ask->refcnt)
c840ac6a HX	192	goto unlock;
03c8efc1 HX	193
	194	swap(ask->type, type);
	195	swap(ask->private, private);
	196
c840ac6a HX	197	err = 0;
	198
	199	unlock:
03c8efc1 HX	200	release_sock(sk);
	201
	202	alg_do_release(type, private);
	203
c840ac6a	204	return err;
03c8efc1 HX	205	}
	206
	207	static int alg_setkey(struct sock sk, char __user ukey,
	208	unsigned int keylen)
	209	{
	210	struct alg_sock *ask = alg_sk(sk);
	211	const struct af_alg_type *type = ask->type;
	212	u8 *key;
	213	int err;
	214
	215	key = sock_kmalloc(sk, keylen, GFP_KERNEL);
	216	if (!key)
	217	return -ENOMEM;
	218
	219	err = -EFAULT;
	220	if (copy_from_user(key, ukey, keylen))
	221	goto out;
	222
	223	err = type->setkey(ask->private, key, keylen);
	224
	225	out:
ad202c8c	226	sock_kzfree_s(sk, key, keylen);
03c8efc1 HX	227
	228	return err;
	229	}
	230
	231	static int alg_setsockopt(struct socket *sock, int level, int optname,
	232	char __user *optval, unsigned int optlen)
	233	{
	234	struct sock *sk = sock->sk;
	235	struct alg_sock *ask = alg_sk(sk);
	236	const struct af_alg_type *type;
c840ac6a	237	int err = -EBUSY;
03c8efc1 HX	238
03c8efc1 HX	239	lock_sock(sk);
c840ac6a HX	240	if (ask->refcnt)
	241	goto unlock;
	242
03c8efc1 HX	243	type = ask->type;
03c8efc1 HX	244
c840ac6a	245	err = -ENOPROTOOPT;
03c8efc1 HX	246	if (level != SOL_ALG \|\| !type)
	247	goto unlock;
	248
	249	switch (optname) {
	250	case ALG_SET_KEY:
	251	if (sock->state == SS_CONNECTED)
	252	goto unlock;
	253	if (!type->setkey)
	254	goto unlock;
	255
	256	err = alg_setkey(sk, optval, optlen);
25fb8638 SM	257	break;
	258	case ALG_SET_AEAD_AUTHSIZE:
	259	if (sock->state == SS_CONNECTED)
	260	goto unlock;
	261	if (!type->setauthsize)
	262	goto unlock;
	263	err = type->setauthsize(ask->private, optlen);
03c8efc1 HX	264	}
	265
	266	unlock:
	267	release_sock(sk);
	268
	269	return err;
	270	}
	271
	272	int af_alg_accept(struct sock sk, struct socket newsock)
	273	{
	274	struct alg_sock *ask = alg_sk(sk);
	275	const struct af_alg_type *type;
	276	struct sock *sk2;
6a935170	277	unsigned int nokey;
03c8efc1 HX	278	int err;
	279
	280	lock_sock(sk);
	281	type = ask->type;
	282
	283	err = -EINVAL;
	284	if (!type)
	285	goto unlock;
	286
11aa9c28	287	sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, 0);
03c8efc1 HX	288	err = -ENOMEM;
	289	if (!sk2)
	290	goto unlock;
	291
	292	sock_init_data(newsock, sk2);
507cad35	293	sock_graft(sk2, newsock);
4c63f83c	294	security_sk_clone(sk, sk2);
03c8efc1 HX	295
03c8efc1 HX	296	err = type->accept(ask->private, sk2);
37766586 HX	297
	298	nokey = err == -ENOKEY;
	299	if (nokey && type->accept_nokey)
	300	err = type->accept_nokey(ask->private, sk2);
	301
a383292c	302	if (err)
03c8efc1	303	goto unlock;
03c8efc1 HX	304
	305	sk2->sk_family = PF_ALG;
	306
37766586	307	if (nokey \|\| !ask->refcnt++)
c840ac6a	308	sock_hold(sk);
03c8efc1 HX	309	alg_sk(sk2)->parent = sk;
03c8efc1 HX	310	alg_sk(sk2)->type = type;
6a935170	311	alg_sk(sk2)->nokey_refcnt = nokey;
03c8efc1 HX	312
	313	newsock->ops = type->ops;
	314	newsock->state = SS_CONNECTED;
	315
37766586 HX	316	if (nokey)
	317	newsock->ops = type->ops_nokey;
	318
03c8efc1 HX	319	err = 0;
	320
	321	unlock:
	322	release_sock(sk);
	323
	324	return err;
	325	}
	326	EXPORT_SYMBOL_GPL(af_alg_accept);
	327
	328	static int alg_accept(struct socket sock, struct socket newsock, int flags)
	329	{
	330	return af_alg_accept(sock->sk, newsock);
	331	}
	332
	333	static const struct proto_ops alg_proto_ops = {
	334	.family = PF_ALG,
	335	.owner = THIS_MODULE,
	336
	337	.connect = sock_no_connect,
	338	.socketpair = sock_no_socketpair,
	339	.getname = sock_no_getname,
	340	.ioctl = sock_no_ioctl,
	341	.listen = sock_no_listen,
	342	.shutdown = sock_no_shutdown,
	343	.getsockopt = sock_no_getsockopt,
	344	.mmap = sock_no_mmap,
	345	.sendpage = sock_no_sendpage,
	346	.sendmsg = sock_no_sendmsg,
	347	.recvmsg = sock_no_recvmsg,
	348	.poll = sock_no_poll,
	349
	350	.bind = alg_bind,
	351	.release = af_alg_release,
	352	.setsockopt = alg_setsockopt,
	353	.accept = alg_accept,
	354	};
	355
	356	static void alg_sock_destruct(struct sock *sk)
	357	{
	358	struct alg_sock *ask = alg_sk(sk);
	359
	360	alg_do_release(ask->type, ask->private);
	361	}
	362
	363	static int alg_create(struct net net, struct socket sock, int protocol,
	364	int kern)
	365	{
	366	struct sock *sk;
	367	int err;
	368
	369	if (sock->type != SOCK_SEQPACKET)
	370	return -ESOCKTNOSUPPORT;
	371	if (protocol != 0)
	372	return -EPROTONOSUPPORT;
	373
	374	err = -ENOMEM;
11aa9c28	375	sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto, kern);
03c8efc1 HX	376	if (!sk)
	377	goto out;
	378
	379	sock->ops = &alg_proto_ops;
	380	sock_init_data(sock, sk);
	381
	382	sk->sk_family = PF_ALG;
	383	sk->sk_destruct = alg_sock_destruct;
	384
	385	return 0;
	386	out:
	387	return err;
	388	}
	389
	390	static const struct net_proto_family alg_family = {
	391	.family = PF_ALG,
	392	.create = alg_create,
	393	.owner = THIS_MODULE,
	394	};
	395
1d10eb2f	396	int af_alg_make_sg(struct af_alg_sgl sgl, struct iov_iter iter, int len)
03c8efc1	397	{
1d10eb2f AV	398	size_t off;
	399	ssize_t n;
	400	int npages, i;
03c8efc1	401
1d10eb2f AV	402	n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
	403	if (n < 0)
	404	return n;
03c8efc1	405
9399f0c5	406	npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;
03c8efc1	407	if (WARN_ON(npages == 0))
1d10eb2f	408	return -EINVAL;
66db3739 TS	409	/* Add one extra for linking */
66db3739 TS	410	sg_init_table(sgl->sg, npages + 1);
03c8efc1	411
1d10eb2f	412	for (i = 0, len = n; i < npages; i++) {
03c8efc1 HX	413	int plen = min_t(int, len, PAGE_SIZE - off);
	414
	415	sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
	416
	417	off = 0;
	418	len -= plen;
03c8efc1	419	}
66db3739 TS	420	sg_mark_end(sgl->sg + npages - 1);
	421	sgl->npages = npages;
	422
1d10eb2f	423	return n;
03c8efc1 HX	424	}
	425	EXPORT_SYMBOL_GPL(af_alg_make_sg);
	426
66db3739 TS	427	void af_alg_link_sg(struct af_alg_sgl sgl_prev, struct af_alg_sgl sgl_new)
	428	{
	429	sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
	430	sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
	431	}
bd507520	432	EXPORT_SYMBOL_GPL(af_alg_link_sg);
66db3739	433
03c8efc1 HX	434	void af_alg_free_sg(struct af_alg_sgl *sgl)
	435	{
	436	int i;
	437
66db3739	438	for (i = 0; i < sgl->npages; i++)
03c8efc1	439	put_page(sgl->pages[i]);
03c8efc1 HX	440	}
	441	EXPORT_SYMBOL_GPL(af_alg_free_sg);
	442
	443	int af_alg_cmsg_send(struct msghdr msg, struct af_alg_control con)
	444	{
	445	struct cmsghdr *cmsg;
	446
f95b414e	447	for_each_cmsghdr(cmsg, msg) {
03c8efc1 HX	448	if (!CMSG_OK(msg, cmsg))
	449	return -EINVAL;
	450	if (cmsg->cmsg_level != SOL_ALG)
	451	continue;
	452
267c4221	453	switch (cmsg->cmsg_type) {
03c8efc1 HX	454	case ALG_SET_IV:
	455	if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
	456	return -EINVAL;
	457	con->iv = (void *)CMSG_DATA(cmsg);
	458	if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
	459	sizeof(*con->iv)))
	460	return -EINVAL;
	461	break;
	462
	463	case ALG_SET_OP:
	464	if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
	465	return -EINVAL;
	466	con->op = (u32 )CMSG_DATA(cmsg);
	467	break;
	468
af8e8073 SM	469	case ALG_SET_AEAD_ASSOCLEN:
	470	if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
	471	return -EINVAL;
	472	con->aead_assoclen = (u32 )CMSG_DATA(cmsg);
	473	break;
	474
03c8efc1 HX	475	default:
	476	return -EINVAL;
	477	}
	478	}
	479
	480	return 0;
	481	}
	482	EXPORT_SYMBOL_GPL(af_alg_cmsg_send);
	483
	484	int af_alg_wait_for_completion(int err, struct af_alg_completion *completion)
	485	{
	486	switch (err) {
	487	case -EINPROGRESS:
	488	case -EBUSY:
	489	wait_for_completion(&completion->completion);
16735d02	490	reinit_completion(&completion->completion);
03c8efc1 HX	491	err = completion->err;
	492	break;
	493	};
	494
	495	return err;
	496	}
	497	EXPORT_SYMBOL_GPL(af_alg_wait_for_completion);
	498
	499	void af_alg_complete(struct crypto_async_request *req, int err)
	500	{
	501	struct af_alg_completion *completion = req->data;
	502
7e77bdeb RV	503	if (err == -EINPROGRESS)
	504	return;
	505
03c8efc1 HX	506	completion->err = err;
	507	complete(&completion->completion);
	508	}
	509	EXPORT_SYMBOL_GPL(af_alg_complete);
	510
	511	static int __init af_alg_init(void)
	512	{
	513	int err = proto_register(&alg_proto, 0);
	514
	515	if (err)
	516	goto out;
	517
	518	err = sock_register(&alg_family);
	519	if (err != 0)
	520	goto out_unregister_proto;
	521
	522	out:
	523	return err;
	524
	525	out_unregister_proto:
	526	proto_unregister(&alg_proto);
	527	goto out;
	528	}
	529
	530	static void __exit af_alg_exit(void)
	531	{
	532	sock_unregister(PF_ALG);
	533	proto_unregister(&alg_proto);
	534	}
	535
	536	module_init(af_alg_init);
	537	module_exit(af_alg_exit);
	538	MODULE_LICENSE("GPL");
	539	MODULE_ALIAS_NETPROTO(AF_ALG);