[linux-2.6-block.git] / net / batman-adv / icmp_socket.c

/* Copyright (C) 2007-2015 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, see <http://www.gnu.org/licenses/>.
 */

#include "icmp_socket.h"
#include "main.h"

#include <linux/atomic.h>
#include <linux/compiler.h>
#include <linux/debugfs.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/export.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/if_ether.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/pkt_sched.h>
#include <linux/poll.h>
#include <linux/printk.h>
#include <linux/sched.h> /* for linux/wait.h */
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stat.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/wait.h>

#include "hard-interface.h"
#include "originator.h"
#include "packet.h"
#include "send.h"

static struct batadv_socket_client *batadv_socket_client_hash[256];

static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
				     struct batadv_icmp_header *icmph,
				     size_t icmp_len);

void batadv_socket_init(void)
{
	memset(batadv_socket_client_hash, 0, sizeof(batadv_socket_client_hash));
}

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

	if (!try_module_get(THIS_MODULE))
		return -EBUSY;

	nonseekable_open(inode, file);

	socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
	if (!socket_client) {
		module_put(THIS_MODULE);
		return -ENOMEM;
	}

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

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

	return 0;
}

static int batadv_socket_release(struct inode *inode, struct file *file)
{
	struct batadv_socket_client *socket_client = file->private_data;
	struct batadv_socket_packet *socket_packet;
	struct list_head *list_pos, *list_pos_tmp;

	spin_lock_bh(&socket_client->lock);

	/* 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 batadv_socket_packet, list);

		list_del(list_pos);
		kfree(socket_packet);
	}

	batadv_socket_client_hash[socket_client->index] = NULL;
	spin_unlock_bh(&socket_client->lock);

	kfree(socket_client);
	module_put(THIS_MODULE);

	return 0;
}

static ssize_t batadv_socket_read(struct file *file, char __user *buf,
				  size_t count, loff_t *ppos)
{
	struct batadv_socket_client *socket_client = file->private_data;
	struct batadv_socket_packet *socket_packet;
	size_t packet_len;
	int error;

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

	if ((!buf) || (count < sizeof(struct batadv_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_bh(&socket_client->lock);

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

	spin_unlock_bh(&socket_client->lock);

	packet_len = min(count, socket_packet->icmp_len);
	error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);

	kfree(socket_packet);

	if (error)
		return -EFAULT;

	return packet_len;
}

static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
				   size_t len, loff_t *off)
{
	struct batadv_socket_client *socket_client = file->private_data;
	struct batadv_priv *bat_priv = socket_client->bat_priv;
	struct batadv_hard_iface *primary_if = NULL;
	struct sk_buff *skb;
	struct batadv_icmp_packet_rr *icmp_packet_rr;
	struct batadv_icmp_header *icmp_header;
	struct batadv_orig_node *orig_node = NULL;
	struct batadv_neigh_node *neigh_node = NULL;
	size_t packet_len = sizeof(struct batadv_icmp_packet);
	u8 *addr;

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

	primary_if = batadv_primary_if_get_selected(bat_priv);

	if (!primary_if) {
		len = -EFAULT;
		goto out;
	}

	if (len >= BATADV_ICMP_MAX_PACKET_SIZE)
		packet_len = BATADV_ICMP_MAX_PACKET_SIZE;
	else
		packet_len = len;

	skb = netdev_alloc_skb_ip_align(NULL, packet_len + ETH_HLEN);
	if (!skb) {
		len = -ENOMEM;
		goto out;
	}

	skb->priority = TC_PRIO_CONTROL;
	skb_reserve(skb, ETH_HLEN);
	icmp_header = (struct batadv_icmp_header *)skb_put(skb, packet_len);

	if (copy_from_user(icmp_header, buff, packet_len)) {
		len = -EFAULT;
		goto free_skb;
	}

	if (icmp_header->packet_type != BATADV_ICMP) {
		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
			   "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n");
		len = -EINVAL;
		goto free_skb;
	}

	switch (icmp_header->msg_type) {
	case BATADV_ECHO_REQUEST:
		if (len < sizeof(struct batadv_icmp_packet)) {
			batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
				   "Error - can't send packet from char device: invalid packet size\n");
			len = -EINVAL;
			goto free_skb;
		}

		if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
			goto dst_unreach;

		orig_node = batadv_orig_hash_find(bat_priv, icmp_header->dst);
		if (!orig_node)
			goto dst_unreach;

		neigh_node = batadv_orig_router_get(orig_node,
						    BATADV_IF_DEFAULT);
		if (!neigh_node)
			goto dst_unreach;

		if (!neigh_node->if_incoming)
			goto dst_unreach;

		if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE)
			goto dst_unreach;

		icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header;
		if (packet_len == sizeof(*icmp_packet_rr)) {
			addr = neigh_node->if_incoming->net_dev->dev_addr;
			ether_addr_copy(icmp_packet_rr->rr[0], addr);
		}

		break;
	default:
		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
			   "Error - can't send packet from char device: got unknown message type\n");
		len = -EINVAL;
		goto free_skb;
	}

	icmp_header->uid = socket_client->index;

	if (icmp_header->version != BATADV_COMPAT_VERSION) {
		icmp_header->msg_type = BATADV_PARAMETER_PROBLEM;
		icmp_header->version = BATADV_COMPAT_VERSION;
		batadv_socket_add_packet(socket_client, icmp_header,
					 packet_len);
		goto free_skb;
	}

	ether_addr_copy(icmp_header->orig, primary_if->net_dev->dev_addr);

	batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
	goto out;

dst_unreach:
	icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE;
	batadv_socket_add_packet(socket_client, icmp_header, packet_len);
free_skb:
	kfree_skb(skb);
out:
	if (primary_if)
		batadv_hardif_free_ref(primary_if);
	if (neigh_node)
		batadv_neigh_node_free_ref(neigh_node);
	if (orig_node)
		batadv_orig_node_free_ref(orig_node);
	return len;
}

static unsigned int batadv_socket_poll(struct file *file, poll_table *wait)
{
	struct batadv_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 batadv_fops = {
	.owner = THIS_MODULE,
	.open = batadv_socket_open,
	.release = batadv_socket_release,
	.read = batadv_socket_read,
	.write = batadv_socket_write,
	.poll = batadv_socket_poll,
	.llseek = no_llseek,
};

int batadv_socket_setup(struct batadv_priv *bat_priv)
{
	struct dentry *d;

	if (!bat_priv->debug_dir)
		goto err;

	d = debugfs_create_file(BATADV_ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
				bat_priv->debug_dir, bat_priv, &batadv_fops);
	if (!d)
		goto err;

	return 0;

err:
	return -ENOMEM;
}

/**
 * batadv_socket_receive_packet - schedule an icmp packet to be sent to
 *  userspace on an icmp socket.
 * @socket_client: the socket this packet belongs to
 * @icmph: pointer to the header of the icmp packet
 * @icmp_len: total length of the icmp packet
 */
static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
				     struct batadv_icmp_header *icmph,
				     size_t icmp_len)
{
	struct batadv_socket_packet *socket_packet;
	size_t len;

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

	if (!socket_packet)
		return;

	len = icmp_len;
	/* check the maximum length before filling the buffer */
	if (len > sizeof(socket_packet->icmp_packet))
		len = sizeof(socket_packet->icmp_packet);

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

	spin_lock_bh(&socket_client->lock);

	/* while waiting for the lock the socket_client could have been
	 * deleted
	 */
	if (!batadv_socket_client_hash[icmph->uid]) {
		spin_unlock_bh(&socket_client->lock);
		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 batadv_socket_packet,
						 list);

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

	spin_unlock_bh(&socket_client->lock);

	wake_up(&socket_client->queue_wait);
}

/**
 * batadv_socket_receive_packet - schedule an icmp packet to be received
 *  locally and sent to userspace.
 * @icmph: pointer to the header of the icmp packet
 * @icmp_len: total length of the icmp packet
 */
void batadv_socket_receive_packet(struct batadv_icmp_header *icmph,
				  size_t icmp_len)
{
	struct batadv_socket_client *hash;

	hash = batadv_socket_client_hash[icmph->uid];
	if (hash)
		batadv_socket_add_packet(hash, icmph, icmp_len);
}
Commit	Line	Data
9f6446c7	1	/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors:
c6c8fea2 SE	2	*
	3	* Marek Lindner
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of version 2 of the GNU General Public
	7	* License as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	* General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
ebf38fb7	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
c6c8fea2 SE	16	*/
c6c8fea2 SE	17
1e2c2a4f	18	#include "icmp_socket.h"
c6c8fea2	19	#include "main.h"
1e2c2a4f SE	20
	21	#include <linux/atomic.h>
	22	#include <linux/compiler.h>
c6c8fea2	23	#include <linux/debugfs.h>
1e2c2a4f SE	24	#include <linux/errno.h>
	25	#include <linux/etherdevice.h>
	26	#include <linux/export.h>
	27	#include <linux/fcntl.h>
	28	#include <linux/fs.h>
	29	#include <linux/if_ether.h>
	30	#include <linux/kernel.h>
	31	#include <linux/list.h>
	32	#include <linux/module.h>
	33	#include <linux/netdevice.h>
	34	#include <linux/pkt_sched.h>
	35	#include <linux/poll.h>
	36	#include <linux/printk.h>
	37	#include <linux/sched.h> /* for linux/wait.h */
	38	#include <linux/skbuff.h>
c6c8fea2	39	#include <linux/slab.h>
1e2c2a4f SE	40	#include <linux/spinlock.h>
	41	#include <linux/stat.h>
	42	#include <linux/stddef.h>
	43	#include <linux/string.h>
	44	#include <linux/uaccess.h>
	45	#include <linux/wait.h>
	46
c6c8fea2	47	#include "hard-interface.h"
1e2c2a4f SE	48	#include "originator.h"
	49	#include "packet.h"
	50	#include "send.h"
c6c8fea2	51
56303d34	52	static struct batadv_socket_client *batadv_socket_client_hash[256];
c6c8fea2	53
56303d34	54	static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
da6b8c20	55	struct batadv_icmp_header *icmph,
af4447f6	56	size_t icmp_len);
c6c8fea2	57
9039dc7e	58	void batadv_socket_init(void)
c6c8fea2	59	{
af4447f6	60	memset(batadv_socket_client_hash, 0, sizeof(batadv_socket_client_hash));
c6c8fea2 SE	61	}
c6c8fea2 SE	62
af4447f6	63	static int batadv_socket_open(struct inode inode, struct file file)
c6c8fea2 SE	64	{
c6c8fea2 SE	65	unsigned int i;
56303d34	66	struct batadv_socket_client *socket_client;
c6c8fea2	67
bd5b80d5 SE	68	if (!try_module_get(THIS_MODULE))
	69	return -EBUSY;
	70
c6c8fea2 SE	71	nonseekable_open(inode, file);
c6c8fea2 SE	72
704509b8	73	socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
bd5b80d5 SE	74	if (!socket_client) {
bd5b80d5 SE	75	module_put(THIS_MODULE);
c6c8fea2	76	return -ENOMEM;
bd5b80d5	77	}
c6c8fea2	78
af4447f6 SE	79	for (i = 0; i < ARRAY_SIZE(batadv_socket_client_hash); i++) {
	80	if (!batadv_socket_client_hash[i]) {
	81	batadv_socket_client_hash[i] = socket_client;
c6c8fea2 SE	82	break;
	83	}
	84	}
	85
af4447f6	86	if (i == ARRAY_SIZE(batadv_socket_client_hash)) {
86ceb360	87	pr_err("Error - can't add another packet client: maximum number of clients reached\n");
c6c8fea2	88	kfree(socket_client);
bd5b80d5	89	module_put(THIS_MODULE);
c6c8fea2 SE	90	return -EXFULL;
	91	}
	92
	93	INIT_LIST_HEAD(&socket_client->queue_list);
	94	socket_client->queue_len = 0;
	95	socket_client->index = i;
	96	socket_client->bat_priv = inode->i_private;
	97	spin_lock_init(&socket_client->lock);
	98	init_waitqueue_head(&socket_client->queue_wait);
	99
	100	file->private_data = socket_client;
	101
c6c8fea2 SE	102	return 0;
	103	}
	104
af4447f6	105	static int batadv_socket_release(struct inode inode, struct file file)
c6c8fea2	106	{
56303d34 SE	107	struct batadv_socket_client *socket_client = file->private_data;
56303d34 SE	108	struct batadv_socket_packet *socket_packet;
c6c8fea2 SE	109	struct list_head list_pos, list_pos_tmp;
	110
	111	spin_lock_bh(&socket_client->lock);
	112
	113	/* for all packets in the queue ... */
	114	list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) {
	115	socket_packet = list_entry(list_pos,
56303d34	116	struct batadv_socket_packet, list);
c6c8fea2 SE	117
	118	list_del(list_pos);
	119	kfree(socket_packet);
	120	}
	121
af4447f6	122	batadv_socket_client_hash[socket_client->index] = NULL;
c6c8fea2 SE	123	spin_unlock_bh(&socket_client->lock);
	124
	125	kfree(socket_client);
bd5b80d5	126	module_put(THIS_MODULE);
c6c8fea2 SE	127
	128	return 0;
	129	}
	130
af4447f6 SE	131	static ssize_t batadv_socket_read(struct file file, char __user buf,
af4447f6 SE	132	size_t count, loff_t *ppos)
c6c8fea2	133	{
56303d34 SE	134	struct batadv_socket_client *socket_client = file->private_data;
56303d34 SE	135	struct batadv_socket_packet *socket_packet;
c6c8fea2 SE	136	size_t packet_len;
	137	int error;
	138
	139	if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
	140	return -EAGAIN;
	141
96412690	142	if ((!buf) \|\| (count < sizeof(struct batadv_icmp_packet)))
c6c8fea2 SE	143	return -EINVAL;
	144
	145	if (!access_ok(VERIFY_WRITE, buf, count))
	146	return -EFAULT;
	147
	148	error = wait_event_interruptible(socket_client->queue_wait,
	149	socket_client->queue_len);
	150
	151	if (error)
	152	return error;
	153
	154	spin_lock_bh(&socket_client->lock);
	155
	156	socket_packet = list_first_entry(&socket_client->queue_list,
56303d34	157	struct batadv_socket_packet, list);
c6c8fea2 SE	158	list_del(&socket_packet->list);
	159	socket_client->queue_len--;
	160
	161	spin_unlock_bh(&socket_client->lock);
	162
b5a1eeef SE	163	packet_len = min(count, socket_packet->icmp_len);
b5a1eeef SE	164	error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);
c6c8fea2	165
c6c8fea2 SE	166	kfree(socket_packet);
	167
	168	if (error)
	169	return -EFAULT;
	170
	171	return packet_len;
	172	}
	173
af4447f6 SE	174	static ssize_t batadv_socket_write(struct file file, const char __user buff,
af4447f6 SE	175	size_t len, loff_t *off)
c6c8fea2	176	{
56303d34 SE	177	struct batadv_socket_client *socket_client = file->private_data;
	178	struct batadv_priv *bat_priv = socket_client->bat_priv;
	179	struct batadv_hard_iface *primary_if = NULL;
c6c8fea2	180	struct sk_buff *skb;
da6b8c20 SW	181	struct batadv_icmp_packet_rr *icmp_packet_rr;
da6b8c20 SW	182	struct batadv_icmp_header *icmp_header;
56303d34 SE	183	struct batadv_orig_node *orig_node = NULL;
56303d34 SE	184	struct batadv_neigh_node *neigh_node = NULL;
96412690	185	size_t packet_len = sizeof(struct batadv_icmp_packet);
6b5e971a	186	u8 *addr;
c6c8fea2	187
da6b8c20	188	if (len < sizeof(struct batadv_icmp_header)) {
39c75a51	189	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1eda58bf	190	"Error - can't send packet from char device: invalid packet size\n");
c6c8fea2 SE	191	return -EINVAL;
	192	}
	193
e5d89254	194	primary_if = batadv_primary_if_get_selected(bat_priv);
32ae9b22 ML	195
	196	if (!primary_if) {
	197	len = -EFAULT;
	198	goto out;
	199	}
c6c8fea2	200
da6b8c20 SW	201	if (len >= BATADV_ICMP_MAX_PACKET_SIZE)
	202	packet_len = BATADV_ICMP_MAX_PACKET_SIZE;
	203	else
	204	packet_len = len;
c6c8fea2	205
41ab6c48	206	skb = netdev_alloc_skb_ip_align(NULL, packet_len + ETH_HLEN);
32ae9b22 ML	207	if (!skb) {
	208	len = -ENOMEM;
	209	goto out;
	210	}
c6c8fea2	211
c54f38c9	212	skb->priority = TC_PRIO_CONTROL;
41ab6c48	213	skb_reserve(skb, ETH_HLEN);
da6b8c20	214	icmp_header = (struct batadv_icmp_header *)skb_put(skb, packet_len);
c6c8fea2	215
da6b8c20	216	if (copy_from_user(icmp_header, buff, packet_len)) {
c6c8fea2 SE	217	len = -EFAULT;
	218	goto free_skb;
	219	}
	220
a40d9b07	221	if (icmp_header->packet_type != BATADV_ICMP) {
39c75a51	222	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1eda58bf	223	"Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n");
c6c8fea2 SE	224	len = -EINVAL;
	225	goto free_skb;
	226	}
	227
da6b8c20 SW	228	switch (icmp_header->msg_type) {
	229	case BATADV_ECHO_REQUEST:
	230	if (len < sizeof(struct batadv_icmp_packet)) {
	231	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
	232	"Error - can't send packet from char device: invalid packet size\n");
	233	len = -EINVAL;
	234	goto free_skb;
	235	}
	236
	237	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
	238	goto dst_unreach;
	239
	240	orig_node = batadv_orig_hash_find(bat_priv, icmp_header->dst);
	241	if (!orig_node)
	242	goto dst_unreach;
	243
7351a482 SW	244	neigh_node = batadv_orig_router_get(orig_node,
7351a482 SW	245	BATADV_IF_DEFAULT);
da6b8c20 SW	246	if (!neigh_node)
	247	goto dst_unreach;
	248
	249	if (!neigh_node->if_incoming)
	250	goto dst_unreach;
	251
	252	if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE)
	253	goto dst_unreach;
	254
	255	icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header;
8fdd0153 AQ	256	if (packet_len == sizeof(*icmp_packet_rr)) {
	257	addr = neigh_node->if_incoming->net_dev->dev_addr;
	258	ether_addr_copy(icmp_packet_rr->rr[0], addr);
	259	}
da6b8c20 SW	260
	261	break;
	262	default:
39c75a51	263	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
da6b8c20	264	"Error - can't send packet from char device: got unknown message type\n");
c6c8fea2 SE	265	len = -EINVAL;
	266	goto free_skb;
	267	}
	268
da6b8c20	269	icmp_header->uid = socket_client->index;
c6c8fea2	270
a40d9b07	271	if (icmp_header->version != BATADV_COMPAT_VERSION) {
da6b8c20	272	icmp_header->msg_type = BATADV_PARAMETER_PROBLEM;
a40d9b07	273	icmp_header->version = BATADV_COMPAT_VERSION;
da6b8c20	274	batadv_socket_add_packet(socket_client, icmp_header,
af4447f6	275	packet_len);
c6c8fea2 SE	276	goto free_skb;
	277	}
	278
8fdd0153	279	ether_addr_copy(icmp_header->orig, primary_if->net_dev->dev_addr);
c6c8fea2	280
9455e34c	281	batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
c6c8fea2 SE	282	goto out;
c6c8fea2 SE	283
c6c8fea2	284	dst_unreach:
da6b8c20 SW	285	icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE;
da6b8c20 SW	286	batadv_socket_add_packet(socket_client, icmp_header, packet_len);
c6c8fea2 SE	287	free_skb:
	288	kfree_skb(skb);
	289	out:
32ae9b22	290	if (primary_if)
e5d89254	291	batadv_hardif_free_ref(primary_if);
44524fcd	292	if (neigh_node)
7d211efc	293	batadv_neigh_node_free_ref(neigh_node);
44524fcd	294	if (orig_node)
7d211efc	295	batadv_orig_node_free_ref(orig_node);
c6c8fea2 SE	296	return len;
	297	}
	298
af4447f6	299	static unsigned int batadv_socket_poll(struct file file, poll_table wait)
c6c8fea2	300	{
56303d34	301	struct batadv_socket_client *socket_client = file->private_data;
c6c8fea2 SE	302
	303	poll_wait(file, &socket_client->queue_wait, wait);
	304
	305	if (socket_client->queue_len > 0)
	306	return POLLIN \| POLLRDNORM;
	307
	308	return 0;
	309	}
	310
af4447f6	311	static const struct file_operations batadv_fops = {
c6c8fea2	312	.owner = THIS_MODULE,
af4447f6 SE	313	.open = batadv_socket_open,
	314	.release = batadv_socket_release,
	315	.read = batadv_socket_read,
	316	.write = batadv_socket_write,
	317	.poll = batadv_socket_poll,
c6c8fea2 SE	318	.llseek = no_llseek,
	319	};
	320
56303d34	321	int batadv_socket_setup(struct batadv_priv *bat_priv)
c6c8fea2 SE	322	{
	323	struct dentry *d;
	324
	325	if (!bat_priv->debug_dir)
	326	goto err;
	327
64346643	328	d = debugfs_create_file(BATADV_ICMP_SOCKET, S_IFREG \| S_IWUSR \| S_IRUSR,
af4447f6	329	bat_priv->debug_dir, bat_priv, &batadv_fops);
5346c35e	330	if (!d)
c6c8fea2 SE	331	goto err;
	332
	333	return 0;
	334
	335	err:
5346c35e	336	return -ENOMEM;
c6c8fea2 SE	337	}
c6c8fea2 SE	338
da6b8c20	339	/**
34473822 SE	340	* batadv_socket_receive_packet - schedule an icmp packet to be sent to
34473822 SE	341	* userspace on an icmp socket.
da6b8c20 SW	342	* @socket_client: the socket this packet belongs to
	343	* @icmph: pointer to the header of the icmp packet
	344	* @icmp_len: total length of the icmp packet
	345	*/
56303d34	346	static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
da6b8c20	347	struct batadv_icmp_header *icmph,
af4447f6	348	size_t icmp_len)
c6c8fea2	349	{
56303d34	350	struct batadv_socket_packet *socket_packet;
da6b8c20	351	size_t len;
c6c8fea2	352
704509b8	353	socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC);
c6c8fea2 SE	354
	355	if (!socket_packet)
	356	return;
	357
da6b8c20 SW	358	len = icmp_len;
	359	/* check the maximum length before filling the buffer */
	360	if (len > sizeof(socket_packet->icmp_packet))
	361	len = sizeof(socket_packet->icmp_packet);
	362
c6c8fea2	363	INIT_LIST_HEAD(&socket_packet->list);
da6b8c20 SW	364	memcpy(&socket_packet->icmp_packet, icmph, len);
da6b8c20 SW	365	socket_packet->icmp_len = len;
c6c8fea2 SE	366
	367	spin_lock_bh(&socket_client->lock);
	368
	369	/* while waiting for the lock the socket_client could have been
9cfc7bd6 SE	370	* deleted
9cfc7bd6 SE	371	*/
da6b8c20	372	if (!batadv_socket_client_hash[icmph->uid]) {
c6c8fea2 SE	373	spin_unlock_bh(&socket_client->lock);
	374	kfree(socket_packet);
	375	return;
	376	}
	377
	378	list_add_tail(&socket_packet->list, &socket_client->queue_list);
	379	socket_client->queue_len++;
	380
	381	if (socket_client->queue_len > 100) {
	382	socket_packet = list_first_entry(&socket_client->queue_list,
56303d34 SE	383	struct batadv_socket_packet,
56303d34 SE	384	list);
c6c8fea2 SE	385
	386	list_del(&socket_packet->list);
	387	kfree(socket_packet);
	388	socket_client->queue_len--;
	389	}
	390
	391	spin_unlock_bh(&socket_client->lock);
	392
	393	wake_up(&socket_client->queue_wait);
	394	}
	395
da6b8c20 SW	396	/**
	397	* batadv_socket_receive_packet - schedule an icmp packet to be received
	398	* locally and sent to userspace.
	399	* @icmph: pointer to the header of the icmp packet
	400	* @icmp_len: total length of the icmp packet
	401	*/
	402	void batadv_socket_receive_packet(struct batadv_icmp_header *icmph,
9039dc7e	403	size_t icmp_len)
c6c8fea2	404	{
56303d34	405	struct batadv_socket_client *hash;
c6c8fea2	406
da6b8c20	407	hash = batadv_socket_client_hash[icmph->uid];
c6c8fea2	408	if (hash)
da6b8c20	409	batadv_socket_add_packet(hash, icmph, icmp_len);
c6c8fea2	410	}