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
22 #include <linux/device.h>
23 #include <linux/slab.h>
29 #include "hard-interface.h"
31 static struct class *batman_class;
33 static int Major; /* Major number assigned to our device driver */
35 static const struct file_operations fops = {
36 .open = bat_device_open,
37 .release = bat_device_release,
38 .read = bat_device_read,
39 .write = bat_device_write,
40 .poll = bat_device_poll,
43 static struct device_client *device_client_hash[256];
45 void bat_device_init(void)
47 memset(device_client_hash, 0, sizeof(device_client_hash));
50 int bat_device_setup(void)
57 /* register our device - kernel assigns a free major number */
58 tmp_major = register_chrdev(0, DRIVER_DEVICE, &fops);
60 printk(KERN_ERR "batman-adv:"
61 "Registering the character device failed with %d\n",
66 batman_class = class_create(THIS_MODULE, "batman-adv");
68 if (IS_ERR(batman_class)) {
69 printk(KERN_ERR "batman-adv:"
70 "Could not register class 'batman-adv'\n");
74 device_create(batman_class, NULL, MKDEV(tmp_major, 0), NULL,
81 void bat_device_destroy(void)
86 device_destroy(batman_class, MKDEV(Major, 0));
87 class_destroy(batman_class);
89 /* Unregister the device */
90 unregister_chrdev(Major, DRIVER_DEVICE);
95 int bat_device_open(struct inode *inode, struct file *file)
98 struct device_client *device_client;
100 device_client = kmalloc(sizeof(struct device_client), GFP_KERNEL);
105 for (i = 0; i < ARRAY_SIZE(device_client_hash); i++) {
106 if (!device_client_hash[i]) {
107 device_client_hash[i] = device_client;
112 if (i == ARRAY_SIZE(device_client_hash)) {
113 printk(KERN_ERR "batman-adv:"
114 "Error - can't add another packet client: "
115 "maximum number of clients reached\n");
116 kfree(device_client);
120 INIT_LIST_HEAD(&device_client->queue_list);
121 device_client->queue_len = 0;
122 device_client->index = i;
123 spin_lock_init(&device_client->lock);
124 init_waitqueue_head(&device_client->queue_wait);
126 file->private_data = device_client;
132 int bat_device_release(struct inode *inode, struct file *file)
134 struct device_client *device_client =
135 (struct device_client *)file->private_data;
136 struct device_packet *device_packet;
137 struct list_head *list_pos, *list_pos_tmp;
140 spin_lock_irqsave(&device_client->lock, flags);
142 /* for all packets in the queue ... */
143 list_for_each_safe(list_pos, list_pos_tmp, &device_client->queue_list) {
144 device_packet = list_entry(list_pos,
145 struct device_packet, list);
148 kfree(device_packet);
151 device_client_hash[device_client->index] = NULL;
152 spin_unlock_irqrestore(&device_client->lock, flags);
154 kfree(device_client);
160 ssize_t bat_device_read(struct file *file, char __user *buf, size_t count,
163 struct device_client *device_client =
164 (struct device_client *)file->private_data;
165 struct device_packet *device_packet;
169 if ((file->f_flags & O_NONBLOCK) && (device_client->queue_len == 0))
172 if ((!buf) || (count < sizeof(struct icmp_packet)))
175 if (!access_ok(VERIFY_WRITE, buf, count))
178 error = wait_event_interruptible(device_client->queue_wait,
179 device_client->queue_len);
184 spin_lock_irqsave(&device_client->lock, flags);
186 device_packet = list_first_entry(&device_client->queue_list,
187 struct device_packet, list);
188 list_del(&device_packet->list);
189 device_client->queue_len--;
191 spin_unlock_irqrestore(&device_client->lock, flags);
193 error = __copy_to_user(buf, &device_packet->icmp_packet,
194 sizeof(struct icmp_packet));
196 kfree(device_packet);
201 return sizeof(struct icmp_packet);
204 ssize_t bat_device_write(struct file *file, const char __user *buff,
205 size_t len, loff_t *off)
207 struct device_client *device_client =
208 (struct device_client *)file->private_data;
209 struct icmp_packet icmp_packet;
210 struct orig_node *orig_node;
211 struct batman_if *batman_if;
212 uint8_t dstaddr[ETH_ALEN];
215 if (len < sizeof(struct icmp_packet)) {
216 bat_dbg(DBG_BATMAN, "batman-adv:"
217 "Error - can't send packet from char device: "
218 "invalid packet size\n");
222 if (!access_ok(VERIFY_READ, buff, sizeof(struct icmp_packet)))
225 if (__copy_from_user(&icmp_packet, buff, sizeof(icmp_packet)))
228 if (icmp_packet.packet_type != BAT_ICMP) {
229 bat_dbg(DBG_BATMAN, "batman-adv:"
230 "Error - can't send packet from char device: "
231 "got bogus packet type (expected: BAT_ICMP)\n");
235 if (icmp_packet.msg_type != ECHO_REQUEST) {
236 bat_dbg(DBG_BATMAN, "batman-adv:"
237 "Error - can't send packet from char device: "
238 "got bogus message type (expected: ECHO_REQUEST)\n");
242 icmp_packet.uid = device_client->index;
244 if (icmp_packet.version != COMPAT_VERSION) {
245 icmp_packet.msg_type = PARAMETER_PROBLEM;
246 icmp_packet.ttl = COMPAT_VERSION;
247 bat_device_add_packet(device_client, &icmp_packet);
251 if (atomic_read(&module_state) != MODULE_ACTIVE)
254 spin_lock_irqsave(&orig_hash_lock, flags);
255 orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet.dst));
260 if (!orig_node->router)
263 batman_if = orig_node->router->if_incoming;
264 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
266 spin_unlock_irqrestore(&orig_hash_lock, flags);
271 if (batman_if->if_status != IF_ACTIVE)
274 memcpy(icmp_packet.orig,
275 batman_if->net_dev->dev_addr,
278 send_raw_packet((unsigned char *)&icmp_packet,
279 sizeof(struct icmp_packet),
285 spin_unlock_irqrestore(&orig_hash_lock, flags);
287 icmp_packet.msg_type = DESTINATION_UNREACHABLE;
288 bat_device_add_packet(device_client, &icmp_packet);
293 unsigned int bat_device_poll(struct file *file, poll_table *wait)
295 struct device_client *device_client =
296 (struct device_client *)file->private_data;
298 poll_wait(file, &device_client->queue_wait, wait);
300 if (device_client->queue_len > 0)
301 return POLLIN | POLLRDNORM;
306 void bat_device_add_packet(struct device_client *device_client,
307 struct icmp_packet *icmp_packet)
309 struct device_packet *device_packet;
312 device_packet = kmalloc(sizeof(struct device_packet), GFP_ATOMIC);
317 INIT_LIST_HEAD(&device_packet->list);
318 memcpy(&device_packet->icmp_packet, icmp_packet,
319 sizeof(struct icmp_packet));
321 spin_lock_irqsave(&device_client->lock, flags);
323 /* while waiting for the lock the device_client could have been
325 if (!device_client_hash[icmp_packet->uid]) {
326 spin_unlock_irqrestore(&device_client->lock, flags);
327 kfree(device_packet);
331 list_add_tail(&device_packet->list, &device_client->queue_list);
332 device_client->queue_len++;
334 if (device_client->queue_len > 100) {
335 device_packet = list_first_entry(&device_client->queue_list,
336 struct device_packet, list);
338 list_del(&device_packet->list);
339 kfree(device_packet);
340 device_client->queue_len--;
343 spin_unlock_irqrestore(&device_client->lock, flags);
345 wake_up(&device_client->queue_wait);
348 void bat_device_receive_packet(struct icmp_packet *icmp_packet)
350 struct device_client *hash = device_client_hash[icmp_packet->uid];
353 bat_device_add_packet(hash, icmp_packet);