2 * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
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.
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.
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
23 #include <linux/debugfs.h>
24 #include <linux/slab.h>
25 #include "icmp_socket.h"
29 #include "hard-interface.h"
32 static struct socket_client *socket_client_hash[256];
34 static void bat_socket_add_packet(struct socket_client *socket_client,
35 struct icmp_packet_rr *icmp_packet,
38 void bat_socket_init(void)
40 memset(socket_client_hash, 0, sizeof(socket_client_hash));
43 static int bat_socket_open(struct inode *inode, struct file *file)
46 struct socket_client *socket_client;
48 socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
53 for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
54 if (!socket_client_hash[i]) {
55 socket_client_hash[i] = socket_client;
60 if (i == ARRAY_SIZE(socket_client_hash)) {
61 pr_err("Error - can't add another packet client: "
62 "maximum number of clients reached\n");
67 INIT_LIST_HEAD(&socket_client->queue_list);
68 socket_client->queue_len = 0;
69 socket_client->index = i;
70 socket_client->bat_priv = inode->i_private;
71 spin_lock_init(&socket_client->lock);
72 init_waitqueue_head(&socket_client->queue_wait);
74 file->private_data = socket_client;
80 static int bat_socket_release(struct inode *inode, struct file *file)
82 struct socket_client *socket_client = file->private_data;
83 struct socket_packet *socket_packet;
84 struct list_head *list_pos, *list_pos_tmp;
87 spin_lock_irqsave(&socket_client->lock, flags);
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);
98 socket_client_hash[socket_client->index] = NULL;
99 spin_unlock_irqrestore(&socket_client->lock, flags);
101 kfree(socket_client);
107 static ssize_t bat_socket_read(struct file *file, char __user *buf,
108 size_t count, loff_t *ppos)
110 struct socket_client *socket_client = file->private_data;
111 struct socket_packet *socket_packet;
116 if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
119 if ((!buf) || (count < sizeof(struct icmp_packet)))
122 if (!access_ok(VERIFY_WRITE, buf, count))
125 error = wait_event_interruptible(socket_client->queue_wait,
126 socket_client->queue_len);
131 spin_lock_irqsave(&socket_client->lock, flags);
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--;
138 spin_unlock_irqrestore(&socket_client->lock, flags);
140 error = __copy_to_user(buf, &socket_packet->icmp_packet,
141 socket_packet->icmp_len);
143 packet_len = socket_packet->icmp_len;
144 kfree(socket_packet);
152 static ssize_t bat_socket_write(struct file *file, const char __user *buff,
153 size_t len, loff_t *off)
155 struct socket_client *socket_client = file->private_data;
156 struct bat_priv *bat_priv = socket_client->bat_priv;
157 struct icmp_packet_rr icmp_packet;
158 struct orig_node *orig_node;
159 struct batman_if *batman_if;
160 size_t packet_len = sizeof(struct icmp_packet);
161 uint8_t dstaddr[ETH_ALEN];
164 if (len < sizeof(struct icmp_packet)) {
165 bat_dbg(DBG_BATMAN, bat_priv,
166 "Error - can't send packet from char device: "
167 "invalid packet size\n");
171 if (!bat_priv->primary_if)
174 if (len >= sizeof(struct icmp_packet_rr))
175 packet_len = sizeof(struct icmp_packet_rr);
177 if (!access_ok(VERIFY_READ, buff, packet_len))
180 if (__copy_from_user(&icmp_packet, buff, packet_len))
183 if (icmp_packet.packet_type != BAT_ICMP) {
184 bat_dbg(DBG_BATMAN, bat_priv,
185 "Error - can't send packet from char device: "
186 "got bogus packet type (expected: BAT_ICMP)\n");
190 if (icmp_packet.msg_type != ECHO_REQUEST) {
191 bat_dbg(DBG_BATMAN, bat_priv,
192 "Error - can't send packet from char device: "
193 "got bogus message type (expected: ECHO_REQUEST)\n");
197 icmp_packet.uid = socket_client->index;
199 if (icmp_packet.version != COMPAT_VERSION) {
200 icmp_packet.msg_type = PARAMETER_PROBLEM;
201 icmp_packet.ttl = COMPAT_VERSION;
202 bat_socket_add_packet(socket_client, &icmp_packet, packet_len);
206 if (atomic_read(&module_state) != MODULE_ACTIVE)
209 spin_lock_irqsave(&orig_hash_lock, flags);
210 orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet.dst));
215 if (!orig_node->router)
218 batman_if = orig_node->router->if_incoming;
219 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
221 spin_unlock_irqrestore(&orig_hash_lock, flags);
226 if (batman_if->if_status != IF_ACTIVE)
229 memcpy(icmp_packet.orig,
230 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
232 if (packet_len == sizeof(struct icmp_packet_rr))
233 memcpy(icmp_packet.rr, batman_if->net_dev->dev_addr, ETH_ALEN);
235 send_raw_packet((unsigned char *)&icmp_packet,
236 packet_len, batman_if, dstaddr);
241 spin_unlock_irqrestore(&orig_hash_lock, flags);
243 icmp_packet.msg_type = DESTINATION_UNREACHABLE;
244 bat_socket_add_packet(socket_client, &icmp_packet, packet_len);
249 static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
251 struct socket_client *socket_client = file->private_data;
253 poll_wait(file, &socket_client->queue_wait, wait);
255 if (socket_client->queue_len > 0)
256 return POLLIN | POLLRDNORM;
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,
270 int bat_socket_setup(struct bat_priv *bat_priv)
274 if (!bat_priv->debug_dir)
277 d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
278 bat_priv->debug_dir, bat_priv, &fops);
288 static void bat_socket_add_packet(struct socket_client *socket_client,
289 struct icmp_packet_rr *icmp_packet,
292 struct socket_packet *socket_packet;
295 socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
300 INIT_LIST_HEAD(&socket_packet->list);
301 memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
302 socket_packet->icmp_len = icmp_len;
304 spin_lock_irqsave(&socket_client->lock, flags);
306 /* while waiting for the lock the socket_client could have been
308 if (!socket_client_hash[icmp_packet->uid]) {
309 spin_unlock_irqrestore(&socket_client->lock, flags);
310 kfree(socket_packet);
314 list_add_tail(&socket_packet->list, &socket_client->queue_list);
315 socket_client->queue_len++;
317 if (socket_client->queue_len > 100) {
318 socket_packet = list_first_entry(&socket_client->queue_list,
319 struct socket_packet, list);
321 list_del(&socket_packet->list);
322 kfree(socket_packet);
323 socket_client->queue_len--;
326 spin_unlock_irqrestore(&socket_client->lock, flags);
328 wake_up(&socket_client->queue_wait);
331 void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
334 struct socket_client *hash = socket_client_hash[icmp_packet->uid];
337 bat_socket_add_packet(hash, icmp_packet, icmp_len);