[net-next-2.6.git] / drivers / staging / batman-adv / icmp_socket.c

/*
 * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
 *
 * Marek Lindner
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 *
 */

#include "main.h"
#include <linux/debugfs.h>
#include <linux/slab.h>
#include "icmp_socket.h"
#include "send.h"
#include "types.h"
#include "hash.h"
#include "hard-interface.h"


static struct socket_client *socket_client_hash[256];

static void bat_socket_add_packet(struct socket_client *socket_client,
				  struct icmp_packet_rr *icmp_packet,
				  size_t icmp_len);

void bat_socket_init(void)
{
	memset(socket_client_hash, 0, sizeof(socket_client_hash));
}

static int bat_socket_open(struct inode *inode, struct file *file)
{
	unsigned int i;
	struct socket_client *socket_client;

	socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);

	if (!socket_client)
		return -ENOMEM;

	for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
		if (!socket_client_hash[i]) {
			socket_client_hash[i] = socket_client;
			break;
		}
	}

	if (i == ARRAY_SIZE(socket_client_hash)) {
		pr_err("Error - can't add another packet client: "
		       "maximum number of clients reached\n");
		kfree(socket_client);
		return -EXFULL;
	}

	INIT_LIST_HEAD(&socket_client->queue_list);
	socket_client->queue_len = 0;
	socket_client->index = i;
	socket_client->bat_priv = inode->i_private;
	spin_lock_init(&socket_client->lock);
	init_waitqueue_head(&socket_client->queue_wait);

	file->private_data = socket_client;

	inc_module_count();
	return 0;
}

static int bat_socket_release(struct inode *inode, struct file *file)
{
	struct socket_client *socket_client = file->private_data;
	struct socket_packet *socket_packet;
	struct list_head *list_pos, *list_pos_tmp;
	unsigned long flags;

	spin_lock_irqsave(&socket_client->lock, flags);

	/* for all packets in the queue ... */
	list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) {
		socket_packet = list_entry(list_pos,
					   struct socket_packet, list);

		list_del(list_pos);
		kfree(socket_packet);
	}

	socket_client_hash[socket_client->index] = NULL;
	spin_unlock_irqrestore(&socket_client->lock, flags);

	kfree(socket_client);
	dec_module_count();

	return 0;
}

static ssize_t bat_socket_read(struct file *file, char __user *buf,
			       size_t count, loff_t *ppos)
{
	struct socket_client *socket_client = file->private_data;
	struct socket_packet *socket_packet;
	size_t packet_len;
	int error;
	unsigned long flags;

	if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
		return -EAGAIN;

	if ((!buf) || (count < sizeof(struct icmp_packet)))
		return -EINVAL;

	if (!access_ok(VERIFY_WRITE, buf, count))
		return -EFAULT;

	error = wait_event_interruptible(socket_client->queue_wait,
					 socket_client->queue_len);

	if (error)
		return error;

	spin_lock_irqsave(&socket_client->lock, flags);

	socket_packet = list_first_entry(&socket_client->queue_list,
					 struct socket_packet, list);
	list_del(&socket_packet->list);
	socket_client->queue_len--;

	spin_unlock_irqrestore(&socket_client->lock, flags);

	error = __copy_to_user(buf, &socket_packet->icmp_packet,
			       socket_packet->icmp_len);

	packet_len = socket_packet->icmp_len;
	kfree(socket_packet);

	if (error)
		return -EFAULT;

	return packet_len;
}

static ssize_t bat_socket_write(struct file *file, const char __user *buff,
				size_t len, loff_t *off)
{
	struct socket_client *socket_client = file->private_data;
	struct bat_priv *bat_priv = socket_client->bat_priv;
	struct icmp_packet_rr icmp_packet;
	struct orig_node *orig_node;
	struct batman_if *batman_if;
	size_t packet_len = sizeof(struct icmp_packet);
	uint8_t dstaddr[ETH_ALEN];
	unsigned long flags;

	if (len < sizeof(struct icmp_packet)) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Error - can't send packet from char device: "
			"invalid packet size\n");
		return -EINVAL;
	}

	if (!bat_priv->primary_if)
		return -EFAULT;

	if (len >= sizeof(struct icmp_packet_rr))
		packet_len = sizeof(struct icmp_packet_rr);

	if (!access_ok(VERIFY_READ, buff, packet_len))
		return -EFAULT;

	if (__copy_from_user(&icmp_packet, buff, packet_len))
		return -EFAULT;

	if (icmp_packet.packet_type != BAT_ICMP) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Error - can't send packet from char device: "
			"got bogus packet type (expected: BAT_ICMP)\n");
		return -EINVAL;
	}

	if (icmp_packet.msg_type != ECHO_REQUEST) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Error - can't send packet from char device: "
			"got bogus message type (expected: ECHO_REQUEST)\n");
		return -EINVAL;
	}

	icmp_packet.uid = socket_client->index;

	if (icmp_packet.version != COMPAT_VERSION) {
		icmp_packet.msg_type = PARAMETER_PROBLEM;
		icmp_packet.ttl = COMPAT_VERSION;
		bat_socket_add_packet(socket_client, &icmp_packet, packet_len);
		goto out;
	}

	if (atomic_read(&module_state) != MODULE_ACTIVE)
		goto dst_unreach;

	spin_lock_irqsave(&orig_hash_lock, flags);
	orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet.dst));

	if (!orig_node)
		goto unlock;

	if (!orig_node->router)
		goto unlock;

	batman_if = orig_node->router->if_incoming;
	memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);

	spin_unlock_irqrestore(&orig_hash_lock, flags);

	if (!batman_if)
		goto dst_unreach;

	if (batman_if->if_status != IF_ACTIVE)
		goto dst_unreach;

	memcpy(icmp_packet.orig,
	       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);

	if (packet_len == sizeof(struct icmp_packet_rr))
		memcpy(icmp_packet.rr, batman_if->net_dev->dev_addr, ETH_ALEN);

	send_raw_packet((unsigned char *)&icmp_packet,
			packet_len, batman_if, dstaddr);

	goto out;

unlock:
	spin_unlock_irqrestore(&orig_hash_lock, flags);
dst_unreach:
	icmp_packet.msg_type = DESTINATION_UNREACHABLE;
	bat_socket_add_packet(socket_client, &icmp_packet, packet_len);
out:
	return len;
}

static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
{
	struct socket_client *socket_client = file->private_data;

	poll_wait(file, &socket_client->queue_wait, wait);

	if (socket_client->queue_len > 0)
		return POLLIN | POLLRDNORM;

	return 0;
}

static const struct file_operations fops = {
	.owner = THIS_MODULE,
	.open = bat_socket_open,
	.release = bat_socket_release,
	.read = bat_socket_read,
	.write = bat_socket_write,
	.poll = bat_socket_poll,
};

int bat_socket_setup(struct bat_priv *bat_priv)
{
	struct dentry *d;

	if (!bat_priv->debug_dir)
		goto err;

	d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
				bat_priv->debug_dir, bat_priv, &fops);
	if (d)
		goto err;

	return 0;

err:
	return 1;
}

static void bat_socket_add_packet(struct socket_client *socket_client,
				  struct icmp_packet_rr *icmp_packet,
				  size_t icmp_len)
{
	struct socket_packet *socket_packet;
	unsigned long flags;

	socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);

	if (!socket_packet)
		return;

	INIT_LIST_HEAD(&socket_packet->list);
	memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
	socket_packet->icmp_len = icmp_len;

	spin_lock_irqsave(&socket_client->lock, flags);

	/* while waiting for the lock the socket_client could have been
	 * deleted */
	if (!socket_client_hash[icmp_packet->uid]) {
		spin_unlock_irqrestore(&socket_client->lock, flags);
		kfree(socket_packet);
		return;
	}

	list_add_tail(&socket_packet->list, &socket_client->queue_list);
	socket_client->queue_len++;

	if (socket_client->queue_len > 100) {
		socket_packet = list_first_entry(&socket_client->queue_list,
						 struct socket_packet, list);

		list_del(&socket_packet->list);
		kfree(socket_packet);
		socket_client->queue_len--;
	}

	spin_unlock_irqrestore(&socket_client->lock, flags);

	wake_up(&socket_client->queue_wait);
}

void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
			       size_t icmp_len)
{
	struct socket_client *hash = socket_client_hash[icmp_packet->uid];

	if (hash)
		bat_socket_add_packet(hash, icmp_packet, icmp_len);
}
Commit	Line	Data
c4121432 SE	1	/*
	2	* Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
	3	*
	4	* Marek Lindner
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of version 2 of the GNU General Public
	8	* License as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	18	* 02110-1301, USA
	19	*
	20	*/
	21
c1641862	22	#include "main.h"
c4121432 SE	23	#include <linux/debugfs.h>
c4121432 SE	24	#include <linux/slab.h>
c4121432 SE	25	#include "icmp_socket.h"
	26	#include "send.h"
	27	#include "types.h"
	28	#include "hash.h"
	29	#include "hard-interface.h"
	30
	31
	32	static struct socket_client *socket_client_hash[256];
	33
	34	static void bat_socket_add_packet(struct socket_client *socket_client,
e4cb3720 DS	35	struct icmp_packet_rr *icmp_packet,
e4cb3720 DS	36	size_t icmp_len);
c4121432 SE	37
	38	void bat_socket_init(void)
	39	{
	40	memset(socket_client_hash, 0, sizeof(socket_client_hash));
	41	}
	42
	43	static int bat_socket_open(struct inode inode, struct file file)
	44	{
	45	unsigned int i;
	46	struct socket_client *socket_client;
	47
	48	socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
	49
	50	if (!socket_client)
	51	return -ENOMEM;
	52
	53	for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
	54	if (!socket_client_hash[i]) {
	55	socket_client_hash[i] = socket_client;
	56	break;
	57	}
	58	}
	59
	60	if (i == ARRAY_SIZE(socket_client_hash)) {
c1641862	61	pr_err("Error - can't add another packet client: "
c4121432 SE	62	"maximum number of clients reached\n");
	63	kfree(socket_client);
	64	return -EXFULL;
	65	}
	66
	67	INIT_LIST_HEAD(&socket_client->queue_list);
	68	socket_client->queue_len = 0;
	69	socket_client->index = i;
13334d48	70	socket_client->bat_priv = inode->i_private;
c4121432 SE	71	spin_lock_init(&socket_client->lock);
	72	init_waitqueue_head(&socket_client->queue_wait);
	73
	74	file->private_data = socket_client;
	75
	76	inc_module_count();
	77	return 0;
	78	}
	79
	80	static int bat_socket_release(struct inode inode, struct file file)
	81	{
ba952d84	82	struct socket_client *socket_client = file->private_data;
c4121432 SE	83	struct socket_packet *socket_packet;
	84	struct list_head list_pos, list_pos_tmp;
	85	unsigned long flags;
	86
	87	spin_lock_irqsave(&socket_client->lock, flags);
	88
	89	/* for all packets in the queue ... */
	90	list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) {
	91	socket_packet = list_entry(list_pos,
	92	struct socket_packet, list);
	93
	94	list_del(list_pos);
	95	kfree(socket_packet);
	96	}
	97
	98	socket_client_hash[socket_client->index] = NULL;
	99	spin_unlock_irqrestore(&socket_client->lock, flags);
	100
	101	kfree(socket_client);
	102	dec_module_count();
	103
	104	return 0;
	105	}
	106
	107	static ssize_t bat_socket_read(struct file file, char __user buf,
	108	size_t count, loff_t *ppos)
	109	{
ba952d84	110	struct socket_client *socket_client = file->private_data;
c4121432	111	struct socket_packet *socket_packet;
e4cb3720	112	size_t packet_len;
c4121432 SE	113	int error;
	114	unsigned long flags;
	115
	116	if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
	117	return -EAGAIN;
	118
	119	if ((!buf) \|\| (count < sizeof(struct icmp_packet)))
	120	return -EINVAL;
	121
	122	if (!access_ok(VERIFY_WRITE, buf, count))
	123	return -EFAULT;
	124
	125	error = wait_event_interruptible(socket_client->queue_wait,
	126	socket_client->queue_len);
	127
	128	if (error)
	129	return error;
	130
	131	spin_lock_irqsave(&socket_client->lock, flags);
	132
	133	socket_packet = list_first_entry(&socket_client->queue_list,
	134	struct socket_packet, list);
	135	list_del(&socket_packet->list);
	136	socket_client->queue_len--;
	137
	138	spin_unlock_irqrestore(&socket_client->lock, flags);
	139
	140	error = __copy_to_user(buf, &socket_packet->icmp_packet,
e4cb3720	141	socket_packet->icmp_len);
c4121432	142
e4cb3720	143	packet_len = socket_packet->icmp_len;
c4121432 SE	144	kfree(socket_packet);
	145
	146	if (error)
	147	return -EFAULT;
	148
e4cb3720	149	return packet_len;
c4121432 SE	150	}
	151
	152	static ssize_t bat_socket_write(struct file file, const char __user buff,
	153	size_t len, loff_t *off)
	154	{
ba952d84	155	struct socket_client *socket_client = file->private_data;
13334d48	156	struct bat_priv *bat_priv = socket_client->bat_priv;
e4cb3720	157	struct icmp_packet_rr icmp_packet;
c4121432 SE	158	struct orig_node *orig_node;
c4121432 SE	159	struct batman_if *batman_if;
e4cb3720	160	size_t packet_len = sizeof(struct icmp_packet);
c4121432 SE	161	uint8_t dstaddr[ETH_ALEN];
	162	unsigned long flags;
	163
	164	if (len < sizeof(struct icmp_packet)) {
84ec0864	165	bat_dbg(DBG_BATMAN, bat_priv,
c4121432 SE	166	"Error - can't send packet from char device: "
	167	"invalid packet size\n");
	168	return -EINVAL;
	169	}
	170
13334d48 ML	171	if (!bat_priv->primary_if)
	172	return -EFAULT;
	173
e4cb3720 DS	174	if (len >= sizeof(struct icmp_packet_rr))
	175	packet_len = sizeof(struct icmp_packet_rr);
	176
	177	if (!access_ok(VERIFY_READ, buff, packet_len))
c4121432 SE	178	return -EFAULT;
c4121432 SE	179
e4cb3720	180	if (__copy_from_user(&icmp_packet, buff, packet_len))
c4121432 SE	181	return -EFAULT;
	182
	183	if (icmp_packet.packet_type != BAT_ICMP) {
84ec0864	184	bat_dbg(DBG_BATMAN, bat_priv,
c4121432 SE	185	"Error - can't send packet from char device: "
	186	"got bogus packet type (expected: BAT_ICMP)\n");
	187	return -EINVAL;
	188	}
	189
	190	if (icmp_packet.msg_type != ECHO_REQUEST) {
84ec0864	191	bat_dbg(DBG_BATMAN, bat_priv,
c4121432 SE	192	"Error - can't send packet from char device: "
	193	"got bogus message type (expected: ECHO_REQUEST)\n");
	194	return -EINVAL;
	195	}
	196
	197	icmp_packet.uid = socket_client->index;
	198
	199	if (icmp_packet.version != COMPAT_VERSION) {
	200	icmp_packet.msg_type = PARAMETER_PROBLEM;
	201	icmp_packet.ttl = COMPAT_VERSION;
e4cb3720	202	bat_socket_add_packet(socket_client, &icmp_packet, packet_len);
c4121432 SE	203	goto out;
	204	}
	205
	206	if (atomic_read(&module_state) != MODULE_ACTIVE)
	207	goto dst_unreach;
	208
	209	spin_lock_irqsave(&orig_hash_lock, flags);
	210	orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet.dst));
	211
	212	if (!orig_node)
	213	goto unlock;
	214
	215	if (!orig_node->router)
	216	goto unlock;
	217
	218	batman_if = orig_node->router->if_incoming;
	219	memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
	220
	221	spin_unlock_irqrestore(&orig_hash_lock, flags);
	222
	223	if (!batman_if)
	224	goto dst_unreach;
	225
	226	if (batman_if->if_status != IF_ACTIVE)
	227	goto dst_unreach;
	228
13334d48 ML	229	memcpy(icmp_packet.orig,
13334d48 ML	230	bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
e4cb3720 DS	231
	232	if (packet_len == sizeof(struct icmp_packet_rr))
	233	memcpy(icmp_packet.rr, batman_if->net_dev->dev_addr, ETH_ALEN);
c4121432 SE	234
c4121432 SE	235	send_raw_packet((unsigned char *)&icmp_packet,
e4cb3720	236	packet_len, batman_if, dstaddr);
c4121432 SE	237
	238	goto out;
	239
	240	unlock:
	241	spin_unlock_irqrestore(&orig_hash_lock, flags);
	242	dst_unreach:
	243	icmp_packet.msg_type = DESTINATION_UNREACHABLE;
e4cb3720	244	bat_socket_add_packet(socket_client, &icmp_packet, packet_len);
c4121432 SE	245	out:
	246	return len;
	247	}
	248
	249	static unsigned int bat_socket_poll(struct file file, poll_table wait)
	250	{
ba952d84	251	struct socket_client *socket_client = file->private_data;
c4121432 SE	252
	253	poll_wait(file, &socket_client->queue_wait, wait);
	254
	255	if (socket_client->queue_len > 0)
	256	return POLLIN \| POLLRDNORM;
	257
	258	return 0;
	259	}
	260
	261	static const struct file_operations fops = {
	262	.owner = THIS_MODULE,
	263	.open = bat_socket_open,
	264	.release = bat_socket_release,
	265	.read = bat_socket_read,
	266	.write = bat_socket_write,
	267	.poll = bat_socket_poll,
	268	};
	269
	270	int bat_socket_setup(struct bat_priv *bat_priv)
	271	{
	272	struct dentry *d;
	273
	274	if (!bat_priv->debug_dir)
	275	goto err;
	276
	277	d = debugfs_create_file(ICMP_SOCKET, S_IFREG \| S_IWUSR \| S_IRUSR,
13334d48	278	bat_priv->debug_dir, bat_priv, &fops);
c4121432 SE	279	if (d)
	280	goto err;
	281
	282	return 0;
	283
	284	err:
	285	return 1;
	286	}
	287
	288	static void bat_socket_add_packet(struct socket_client *socket_client,
e4cb3720 DS	289	struct icmp_packet_rr *icmp_packet,
e4cb3720 DS	290	size_t icmp_len)
c4121432 SE	291	{
	292	struct socket_packet *socket_packet;
	293	unsigned long flags;
	294
	295	socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
	296
	297	if (!socket_packet)
	298	return;
	299
	300	INIT_LIST_HEAD(&socket_packet->list);
e4cb3720 DS	301	memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
e4cb3720 DS	302	socket_packet->icmp_len = icmp_len;
c4121432 SE	303
	304	spin_lock_irqsave(&socket_client->lock, flags);
	305
	306	/* while waiting for the lock the socket_client could have been
	307	* deleted */
	308	if (!socket_client_hash[icmp_packet->uid]) {
	309	spin_unlock_irqrestore(&socket_client->lock, flags);
	310	kfree(socket_packet);
	311	return;
	312	}
	313
	314	list_add_tail(&socket_packet->list, &socket_client->queue_list);
	315	socket_client->queue_len++;
	316
	317	if (socket_client->queue_len > 100) {
	318	socket_packet = list_first_entry(&socket_client->queue_list,
	319	struct socket_packet, list);
	320
	321	list_del(&socket_packet->list);
	322	kfree(socket_packet);
	323	socket_client->queue_len--;
	324	}
	325
	326	spin_unlock_irqrestore(&socket_client->lock, flags);
	327
	328	wake_up(&socket_client->queue_wait);
	329	}
	330
e4cb3720 DS	331	void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
e4cb3720 DS	332	size_t icmp_len)
c4121432 SE	333	{
	334	struct socket_client *hash = socket_client_hash[icmp_packet->uid];
	335
	336	if (hash)
e4cb3720	337	bat_socket_add_packet(hash, icmp_packet, icmp_len);
c4121432	338	}