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

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2007-2020  B.A.T.M.A.N. contributors:
 *
 * Marek Lindner
 */

#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/eventpoll.h>
#include <linux/export.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/gfp.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/stddef.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/wait.h>
#include <uapi/linux/batadv_packet.h>

#include "debugfs.h"
#include "hard-interface.h"
#include "log.h"
#include "originator.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);

/**
 * batadv_socket_init() - Initialize soft interface independent socket data
 */
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;

	batadv_debugfs_deprecated(file, "");

	stream_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 *client = file->private_data;
	struct batadv_socket_packet *packet, *tmp;

	spin_lock_bh(&client->lock);

	/* for all packets in the queue ... */
	list_for_each_entry_safe(packet, tmp, &client->queue_list, list) {
		list_del(&packet->list);
		kfree(packet);
	}

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

	kfree(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;

	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 = 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_unicast_skb(skb, neigh_node);
	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_put(primary_if);
	if (neigh_node)
		batadv_neigh_node_put(neigh_node);
	if (orig_node)
		batadv_orig_node_put(orig_node);
	return len;
}

static __poll_t 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 EPOLLIN | EPOLLRDNORM;

	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,
};

/**
 * batadv_socket_setup() - Create debugfs "socket" file
 * @bat_priv: the bat priv with all the soft interface information
 */
void batadv_socket_setup(struct batadv_priv *bat_priv)
{
	debugfs_create_file(BATADV_ICMP_SOCKET, 0600, bat_priv->debug_dir,
			    bat_priv, &batadv_fops);
}

/**
 * batadv_socket_add_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
7db7d9f3	1	// SPDX-License-Identifier: GPL-2.0
68e039f9	2	/* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors:
c6c8fea2 SE	3	*
c6c8fea2 SE	4	* Marek Lindner
c6c8fea2 SE	5	*/
c6c8fea2 SE	6
1e2c2a4f	7	#include "icmp_socket.h"
c6c8fea2	8	#include "main.h"
1e2c2a4f SE	9
	10	#include <linux/atomic.h>
	11	#include <linux/compiler.h>
c6c8fea2	12	#include <linux/debugfs.h>
1e2c2a4f SE	13	#include <linux/errno.h>
1e2c2a4f SE	14	#include <linux/etherdevice.h>
48881ed5	15	#include <linux/eventpoll.h>
1e2c2a4f SE	16	#include <linux/export.h>
	17	#include <linux/fcntl.h>
	18	#include <linux/fs.h>
b92b94ac	19	#include <linux/gfp.h>
1e2c2a4f SE	20	#include <linux/if_ether.h>
	21	#include <linux/kernel.h>
	22	#include <linux/list.h>
	23	#include <linux/module.h>
	24	#include <linux/netdevice.h>
	25	#include <linux/pkt_sched.h>
	26	#include <linux/poll.h>
	27	#include <linux/printk.h>
	28	#include <linux/sched.h> /* for linux/wait.h */
	29	#include <linux/skbuff.h>
c6c8fea2	30	#include <linux/slab.h>
1e2c2a4f	31	#include <linux/spinlock.h>
1e2c2a4f SE	32	#include <linux/stddef.h>
	33	#include <linux/string.h>
	34	#include <linux/uaccess.h>
	35	#include <linux/wait.h>
fec149f5	36	#include <uapi/linux/batadv_packet.h>
1e2c2a4f	37
00caf6a2	38	#include "debugfs.h"
c6c8fea2	39	#include "hard-interface.h"
ba412080	40	#include "log.h"
1e2c2a4f	41	#include "originator.h"
1e2c2a4f	42	#include "send.h"
c6c8fea2	43
56303d34	44	static struct batadv_socket_client *batadv_socket_client_hash[256];
c6c8fea2	45
56303d34	46	static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
da6b8c20	47	struct batadv_icmp_header *icmph,
af4447f6	48	size_t icmp_len);
c6c8fea2	49
ff15c27c SE	50	/**
	51	* batadv_socket_init() - Initialize soft interface independent socket data
	52	*/
9039dc7e	53	void batadv_socket_init(void)
c6c8fea2	54	{
af4447f6	55	memset(batadv_socket_client_hash, 0, sizeof(batadv_socket_client_hash));
c6c8fea2 SE	56	}
c6c8fea2 SE	57
af4447f6	58	static int batadv_socket_open(struct inode inode, struct file file)
c6c8fea2 SE	59	{
c6c8fea2 SE	60	unsigned int i;
56303d34	61	struct batadv_socket_client *socket_client;
c6c8fea2	62
bd5b80d5 SE	63	if (!try_module_get(THIS_MODULE))
	64	return -EBUSY;
	65
00caf6a2 SE	66	batadv_debugfs_deprecated(file, "");
00caf6a2 SE	67
c5bf68fe	68	stream_open(inode, file);
c6c8fea2	69
704509b8	70	socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
bd5b80d5 SE	71	if (!socket_client) {
bd5b80d5 SE	72	module_put(THIS_MODULE);
c6c8fea2	73	return -ENOMEM;
bd5b80d5	74	}
c6c8fea2	75
af4447f6 SE	76	for (i = 0; i < ARRAY_SIZE(batadv_socket_client_hash); i++) {
	77	if (!batadv_socket_client_hash[i]) {
	78	batadv_socket_client_hash[i] = socket_client;
c6c8fea2 SE	79	break;
	80	}
	81	}
	82
af4447f6	83	if (i == ARRAY_SIZE(batadv_socket_client_hash)) {
86ceb360	84	pr_err("Error - can't add another packet client: maximum number of clients reached\n");
c6c8fea2	85	kfree(socket_client);
bd5b80d5	86	module_put(THIS_MODULE);
c6c8fea2 SE	87	return -EXFULL;
	88	}
	89
	90	INIT_LIST_HEAD(&socket_client->queue_list);
	91	socket_client->queue_len = 0;
	92	socket_client->index = i;
	93	socket_client->bat_priv = inode->i_private;
	94	spin_lock_init(&socket_client->lock);
	95	init_waitqueue_head(&socket_client->queue_wait);
	96
	97	file->private_data = socket_client;
	98
c6c8fea2 SE	99	return 0;
	100	}
	101
af4447f6	102	static int batadv_socket_release(struct inode inode, struct file file)
c6c8fea2	103	{
fb1f23ea GT	104	struct batadv_socket_client *client = file->private_data;
fb1f23ea GT	105	struct batadv_socket_packet packet, tmp;
c6c8fea2	106
fb1f23ea	107	spin_lock_bh(&client->lock);
c6c8fea2 SE	108
c6c8fea2 SE	109	/* for all packets in the queue ... */
fb1f23ea GT	110	list_for_each_entry_safe(packet, tmp, &client->queue_list, list) {
	111	list_del(&packet->list);
	112	kfree(packet);
c6c8fea2 SE	113	}
c6c8fea2 SE	114
fb1f23ea GT	115	batadv_socket_client_hash[client->index] = NULL;
fb1f23ea GT	116	spin_unlock_bh(&client->lock);
c6c8fea2	117
fb1f23ea	118	kfree(client);
bd5b80d5	119	module_put(THIS_MODULE);
c6c8fea2 SE	120
	121	return 0;
	122	}
	123
af4447f6 SE	124	static ssize_t batadv_socket_read(struct file file, char __user buf,
af4447f6 SE	125	size_t count, loff_t *ppos)
c6c8fea2	126	{
56303d34 SE	127	struct batadv_socket_client *socket_client = file->private_data;
56303d34 SE	128	struct batadv_socket_packet *socket_packet;
c6c8fea2 SE	129	size_t packet_len;
	130	int error;
	131
825ffe1f	132	if ((file->f_flags & O_NONBLOCK) && socket_client->queue_len == 0)
c6c8fea2 SE	133	return -EAGAIN;
c6c8fea2 SE	134
825ffe1f	135	if (!buf \|\| count < sizeof(struct batadv_icmp_packet))
c6c8fea2 SE	136	return -EINVAL;
c6c8fea2 SE	137
c6c8fea2 SE	138	error = wait_event_interruptible(socket_client->queue_wait,
	139	socket_client->queue_len);
	140
	141	if (error)
	142	return error;
	143
	144	spin_lock_bh(&socket_client->lock);
	145
	146	socket_packet = list_first_entry(&socket_client->queue_list,
56303d34	147	struct batadv_socket_packet, list);
c6c8fea2 SE	148	list_del(&socket_packet->list);
	149	socket_client->queue_len--;
	150
	151	spin_unlock_bh(&socket_client->lock);
	152
b5a1eeef SE	153	packet_len = min(count, socket_packet->icmp_len);
b5a1eeef SE	154	error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);
c6c8fea2	155
c6c8fea2 SE	156	kfree(socket_packet);
	157
	158	if (error)
	159	return -EFAULT;
	160
	161	return packet_len;
	162	}
	163
af4447f6 SE	164	static ssize_t batadv_socket_write(struct file file, const char __user buff,
af4447f6 SE	165	size_t len, loff_t *off)
c6c8fea2	166	{
56303d34 SE	167	struct batadv_socket_client *socket_client = file->private_data;
	168	struct batadv_priv *bat_priv = socket_client->bat_priv;
	169	struct batadv_hard_iface *primary_if = NULL;
c6c8fea2	170	struct sk_buff *skb;
da6b8c20 SW	171	struct batadv_icmp_packet_rr *icmp_packet_rr;
da6b8c20 SW	172	struct batadv_icmp_header *icmp_header;
56303d34 SE	173	struct batadv_orig_node *orig_node = NULL;
56303d34 SE	174	struct batadv_neigh_node *neigh_node = NULL;
96412690	175	size_t packet_len = sizeof(struct batadv_icmp_packet);
6b5e971a	176	u8 *addr;
c6c8fea2	177
da6b8c20	178	if (len < sizeof(struct batadv_icmp_header)) {
39c75a51	179	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1eda58bf	180	"Error - can't send packet from char device: invalid packet size\n");
c6c8fea2 SE	181	return -EINVAL;
	182	}
	183
e5d89254	184	primary_if = batadv_primary_if_get_selected(bat_priv);
32ae9b22 ML	185
	186	if (!primary_if) {
	187	len = -EFAULT;
	188	goto out;
	189	}
c6c8fea2	190
da6b8c20 SW	191	if (len >= BATADV_ICMP_MAX_PACKET_SIZE)
	192	packet_len = BATADV_ICMP_MAX_PACKET_SIZE;
	193	else
	194	packet_len = len;
c6c8fea2	195
41ab6c48	196	skb = netdev_alloc_skb_ip_align(NULL, packet_len + ETH_HLEN);
32ae9b22 ML	197	if (!skb) {
	198	len = -ENOMEM;
	199	goto out;
	200	}
c6c8fea2	201
c54f38c9	202	skb->priority = TC_PRIO_CONTROL;
41ab6c48	203	skb_reserve(skb, ETH_HLEN);
4df864c1	204	icmp_header = skb_put(skb, packet_len);
c6c8fea2	205
da6b8c20	206	if (copy_from_user(icmp_header, buff, packet_len)) {
c6c8fea2 SE	207	len = -EFAULT;
	208	goto free_skb;
	209	}
	210
a40d9b07	211	if (icmp_header->packet_type != BATADV_ICMP) {
39c75a51	212	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1eda58bf	213	"Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n");
c6c8fea2 SE	214	len = -EINVAL;
	215	goto free_skb;
	216	}
	217
da6b8c20 SW	218	switch (icmp_header->msg_type) {
	219	case BATADV_ECHO_REQUEST:
	220	if (len < sizeof(struct batadv_icmp_packet)) {
	221	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
	222	"Error - can't send packet from char device: invalid packet size\n");
	223	len = -EINVAL;
	224	goto free_skb;
	225	}
	226
	227	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
	228	goto dst_unreach;
	229
	230	orig_node = batadv_orig_hash_find(bat_priv, icmp_header->dst);
	231	if (!orig_node)
	232	goto dst_unreach;
	233
7351a482 SW	234	neigh_node = batadv_orig_router_get(orig_node,
7351a482 SW	235	BATADV_IF_DEFAULT);
da6b8c20 SW	236	if (!neigh_node)
	237	goto dst_unreach;
	238
	239	if (!neigh_node->if_incoming)
	240	goto dst_unreach;
	241
	242	if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE)
	243	goto dst_unreach;
	244
	245	icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header;
8fdd0153 AQ	246	if (packet_len == sizeof(*icmp_packet_rr)) {
	247	addr = neigh_node->if_incoming->net_dev->dev_addr;
	248	ether_addr_copy(icmp_packet_rr->rr[0], addr);
	249	}
da6b8c20 SW	250
	251	break;
	252	default:
39c75a51	253	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
da6b8c20	254	"Error - can't send packet from char device: got unknown message type\n");
c6c8fea2 SE	255	len = -EINVAL;
	256	goto free_skb;
	257	}
	258
da6b8c20	259	icmp_header->uid = socket_client->index;
c6c8fea2	260
a40d9b07	261	if (icmp_header->version != BATADV_COMPAT_VERSION) {
da6b8c20	262	icmp_header->msg_type = BATADV_PARAMETER_PROBLEM;
a40d9b07	263	icmp_header->version = BATADV_COMPAT_VERSION;
da6b8c20	264	batadv_socket_add_packet(socket_client, icmp_header,
af4447f6	265	packet_len);
c6c8fea2 SE	266	goto free_skb;
	267	}
	268
8fdd0153	269	ether_addr_copy(icmp_header->orig, primary_if->net_dev->dev_addr);
c6c8fea2	270
95d39278	271	batadv_send_unicast_skb(skb, neigh_node);
c6c8fea2 SE	272	goto out;
c6c8fea2 SE	273
c6c8fea2	274	dst_unreach:
da6b8c20 SW	275	icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE;
da6b8c20 SW	276	batadv_socket_add_packet(socket_client, icmp_header, packet_len);
c6c8fea2 SE	277	free_skb:
	278	kfree_skb(skb);
	279	out:
32ae9b22	280	if (primary_if)
82047ad7	281	batadv_hardif_put(primary_if);
44524fcd	282	if (neigh_node)
25bb2509	283	batadv_neigh_node_put(neigh_node);
44524fcd	284	if (orig_node)
5d967310	285	batadv_orig_node_put(orig_node);
c6c8fea2 SE	286	return len;
	287	}
	288
ade994f4	289	static __poll_t batadv_socket_poll(struct file file, poll_table wait)
c6c8fea2	290	{
56303d34	291	struct batadv_socket_client *socket_client = file->private_data;
c6c8fea2 SE	292
	293	poll_wait(file, &socket_client->queue_wait, wait);
	294
	295	if (socket_client->queue_len > 0)
a9a08845	296	return EPOLLIN \| EPOLLRDNORM;
c6c8fea2 SE	297
	298	return 0;
	299	}
	300
af4447f6	301	static const struct file_operations batadv_fops = {
c6c8fea2	302	.owner = THIS_MODULE,
af4447f6 SE	303	.open = batadv_socket_open,
	304	.release = batadv_socket_release,
	305	.read = batadv_socket_read,
	306	.write = batadv_socket_write,
	307	.poll = batadv_socket_poll,
c6c8fea2 SE	308	.llseek = no_llseek,
	309	};
	310
ff15c27c SE	311	/**
	312	* batadv_socket_setup() - Create debugfs "socket" file
	313	* @bat_priv: the bat priv with all the soft interface information
ff15c27c	314	*/
3bcacd1e	315	void batadv_socket_setup(struct batadv_priv *bat_priv)
c6c8fea2	316	{
3bcacd1e GKH	317	debugfs_create_file(BATADV_ICMP_SOCKET, 0600, bat_priv->debug_dir,
3bcacd1e GKH	318	bat_priv, &batadv_fops);
c6c8fea2 SE	319	}
c6c8fea2 SE	320
da6b8c20	321	/**
7e9a8c2c	322	* batadv_socket_add_packet() - schedule an icmp packet to be sent to
34473822	323	* userspace on an icmp socket.
da6b8c20 SW	324	* @socket_client: the socket this packet belongs to
	325	* @icmph: pointer to the header of the icmp packet
	326	* @icmp_len: total length of the icmp packet
	327	*/
56303d34	328	static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
da6b8c20	329	struct batadv_icmp_header *icmph,
af4447f6	330	size_t icmp_len)
c6c8fea2	331	{
56303d34	332	struct batadv_socket_packet *socket_packet;
da6b8c20	333	size_t len;
c6c8fea2	334
704509b8	335	socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC);
c6c8fea2 SE	336
	337	if (!socket_packet)
	338	return;
	339
da6b8c20 SW	340	len = icmp_len;
	341	/* check the maximum length before filling the buffer */
	342	if (len > sizeof(socket_packet->icmp_packet))
	343	len = sizeof(socket_packet->icmp_packet);
	344
c6c8fea2	345	INIT_LIST_HEAD(&socket_packet->list);
da6b8c20 SW	346	memcpy(&socket_packet->icmp_packet, icmph, len);
da6b8c20 SW	347	socket_packet->icmp_len = len;
c6c8fea2 SE	348
	349	spin_lock_bh(&socket_client->lock);
	350
	351	/* while waiting for the lock the socket_client could have been
9cfc7bd6 SE	352	* deleted
9cfc7bd6 SE	353	*/
da6b8c20	354	if (!batadv_socket_client_hash[icmph->uid]) {
c6c8fea2 SE	355	spin_unlock_bh(&socket_client->lock);
	356	kfree(socket_packet);
	357	return;
	358	}
	359
	360	list_add_tail(&socket_packet->list, &socket_client->queue_list);
	361	socket_client->queue_len++;
	362
	363	if (socket_client->queue_len > 100) {
	364	socket_packet = list_first_entry(&socket_client->queue_list,
56303d34 SE	365	struct batadv_socket_packet,
56303d34 SE	366	list);
c6c8fea2 SE	367
	368	list_del(&socket_packet->list);
	369	kfree(socket_packet);
	370	socket_client->queue_len--;
	371	}
	372
	373	spin_unlock_bh(&socket_client->lock);
	374
	375	wake_up(&socket_client->queue_wait);
	376	}
	377
da6b8c20	378	/**
7e9a8c2c	379	* batadv_socket_receive_packet() - schedule an icmp packet to be received
da6b8c20 SW	380	* locally and sent to userspace.
	381	* @icmph: pointer to the header of the icmp packet
	382	* @icmp_len: total length of the icmp packet
	383	*/
	384	void batadv_socket_receive_packet(struct batadv_icmp_header *icmph,
9039dc7e	385	size_t icmp_len)
c6c8fea2	386	{
56303d34	387	struct batadv_socket_client *hash;
c6c8fea2	388
da6b8c20	389	hash = batadv_socket_client_hash[icmph->uid];
c6c8fea2	390	if (hash)
da6b8c20	391	batadv_socket_add_packet(hash, icmph, icmp_len);
c6c8fea2	392	}