blob: ecf6d7ffab2ededc79c4a4d119163bad9662899c [file] [log] [blame]
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001/*
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
22#include "main.h"
23#include <linux/debugfs.h>
24#include <linux/slab.h>
25#include "icmp_socket.h"
26#include "send.h"
27#include "types.h"
28#include "hash.h"
29#include "originator.h"
30#include "hard-interface.h"
31
32static struct socket_client *socket_client_hash[256];
33
34static void bat_socket_add_packet(struct socket_client *socket_client,
35 struct icmp_packet_rr *icmp_packet,
36 size_t icmp_len);
37
38void bat_socket_init(void)
39{
40 memset(socket_client_hash, 0, sizeof(socket_client_hash));
41}
42
43static int bat_socket_open(struct inode *inode, struct file *file)
44{
45 unsigned int i;
46 struct socket_client *socket_client;
47
48 nonseekable_open(inode, file);
49
50 socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
51
52 if (!socket_client)
53 return -ENOMEM;
54
55 for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
56 if (!socket_client_hash[i]) {
57 socket_client_hash[i] = socket_client;
58 break;
59 }
60 }
61
62 if (i == ARRAY_SIZE(socket_client_hash)) {
63 pr_err("Error - can't add another packet client: "
64 "maximum number of clients reached\n");
65 kfree(socket_client);
66 return -EXFULL;
67 }
68
69 INIT_LIST_HEAD(&socket_client->queue_list);
70 socket_client->queue_len = 0;
71 socket_client->index = i;
72 socket_client->bat_priv = inode->i_private;
73 spin_lock_init(&socket_client->lock);
74 init_waitqueue_head(&socket_client->queue_wait);
75
76 file->private_data = socket_client;
77
78 inc_module_count();
79 return 0;
80}
81
82static int bat_socket_release(struct inode *inode, struct file *file)
83{
84 struct socket_client *socket_client = file->private_data;
85 struct socket_packet *socket_packet;
86 struct list_head *list_pos, *list_pos_tmp;
87
88 spin_lock_bh(&socket_client->lock);
89
90 /* for all packets in the queue ... */
91 list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) {
92 socket_packet = list_entry(list_pos,
93 struct socket_packet, list);
94
95 list_del(list_pos);
96 kfree(socket_packet);
97 }
98
99 socket_client_hash[socket_client->index] = NULL;
100 spin_unlock_bh(&socket_client->lock);
101
102 kfree(socket_client);
103 dec_module_count();
104
105 return 0;
106}
107
108static ssize_t bat_socket_read(struct file *file, char __user *buf,
109 size_t count, loff_t *ppos)
110{
111 struct socket_client *socket_client = file->private_data;
112 struct socket_packet *socket_packet;
113 size_t packet_len;
114 int error;
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_bh(&socket_client->lock);
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_bh(&socket_client->lock);
139
140 error = __copy_to_user(buf, &socket_packet->icmp_packet,
141 socket_packet->icmp_len);
142
143 packet_len = socket_packet->icmp_len;
144 kfree(socket_packet);
145
146 if (error)
147 return -EFAULT;
148
149 return packet_len;
150}
151
152static ssize_t bat_socket_write(struct file *file, const char __user *buff,
153 size_t len, loff_t *off)
154{
155 struct socket_client *socket_client = file->private_data;
156 struct bat_priv *bat_priv = socket_client->bat_priv;
157 struct sk_buff *skb;
158 struct icmp_packet_rr *icmp_packet;
159
160 struct orig_node *orig_node;
161 struct batman_if *batman_if;
162 size_t packet_len = sizeof(struct icmp_packet);
163 uint8_t dstaddr[ETH_ALEN];
164
165 if (len < sizeof(struct icmp_packet)) {
166 bat_dbg(DBG_BATMAN, bat_priv,
167 "Error - can't send packet from char device: "
168 "invalid packet size\n");
169 return -EINVAL;
170 }
171
172 if (!bat_priv->primary_if)
173 return -EFAULT;
174
175 if (len >= sizeof(struct icmp_packet_rr))
176 packet_len = sizeof(struct icmp_packet_rr);
177
178 skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
179 if (!skb)
180 return -ENOMEM;
181
182 skb_reserve(skb, sizeof(struct ethhdr));
183 icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
184
185 if (!access_ok(VERIFY_READ, buff, packet_len)) {
186 len = -EFAULT;
187 goto free_skb;
188 }
189
190 if (__copy_from_user(icmp_packet, buff, packet_len)) {
191 len = -EFAULT;
192 goto free_skb;
193 }
194
195 if (icmp_packet->packet_type != BAT_ICMP) {
196 bat_dbg(DBG_BATMAN, bat_priv,
197 "Error - can't send packet from char device: "
198 "got bogus packet type (expected: BAT_ICMP)\n");
199 len = -EINVAL;
200 goto free_skb;
201 }
202
203 if (icmp_packet->msg_type != ECHO_REQUEST) {
204 bat_dbg(DBG_BATMAN, bat_priv,
205 "Error - can't send packet from char device: "
206 "got bogus message type (expected: ECHO_REQUEST)\n");
207 len = -EINVAL;
208 goto free_skb;
209 }
210
211 icmp_packet->uid = socket_client->index;
212
213 if (icmp_packet->version != COMPAT_VERSION) {
214 icmp_packet->msg_type = PARAMETER_PROBLEM;
215 icmp_packet->ttl = COMPAT_VERSION;
216 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
217 goto free_skb;
218 }
219
220 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
221 goto dst_unreach;
222
223 spin_lock_bh(&bat_priv->orig_hash_lock);
224 orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
225 compare_orig, choose_orig,
226 icmp_packet->dst));
227
228 if (!orig_node)
229 goto unlock;
230
231 if (!orig_node->router)
232 goto unlock;
233
234 batman_if = orig_node->router->if_incoming;
235 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
236
237 spin_unlock_bh(&bat_priv->orig_hash_lock);
238
239 if (!batman_if)
240 goto dst_unreach;
241
242 if (batman_if->if_status != IF_ACTIVE)
243 goto dst_unreach;
244
245 memcpy(icmp_packet->orig,
246 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
247
248 if (packet_len == sizeof(struct icmp_packet_rr))
249 memcpy(icmp_packet->rr, batman_if->net_dev->dev_addr, ETH_ALEN);
250
251
252 send_skb_packet(skb, batman_if, dstaddr);
253
254 goto out;
255
256unlock:
257 spin_unlock_bh(&bat_priv->orig_hash_lock);
258dst_unreach:
259 icmp_packet->msg_type = DESTINATION_UNREACHABLE;
260 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
261free_skb:
262 kfree_skb(skb);
263out:
264 return len;
265}
266
267static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
268{
269 struct socket_client *socket_client = file->private_data;
270
271 poll_wait(file, &socket_client->queue_wait, wait);
272
273 if (socket_client->queue_len > 0)
274 return POLLIN | POLLRDNORM;
275
276 return 0;
277}
278
279static const struct file_operations fops = {
280 .owner = THIS_MODULE,
281 .open = bat_socket_open,
282 .release = bat_socket_release,
283 .read = bat_socket_read,
284 .write = bat_socket_write,
285 .poll = bat_socket_poll,
286 .llseek = no_llseek,
287};
288
289int bat_socket_setup(struct bat_priv *bat_priv)
290{
291 struct dentry *d;
292
293 if (!bat_priv->debug_dir)
294 goto err;
295
296 d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
297 bat_priv->debug_dir, bat_priv, &fops);
298 if (d)
299 goto err;
300
301 return 0;
302
303err:
304 return 1;
305}
306
307static void bat_socket_add_packet(struct socket_client *socket_client,
308 struct icmp_packet_rr *icmp_packet,
309 size_t icmp_len)
310{
311 struct socket_packet *socket_packet;
312
313 socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
314
315 if (!socket_packet)
316 return;
317
318 INIT_LIST_HEAD(&socket_packet->list);
319 memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
320 socket_packet->icmp_len = icmp_len;
321
322 spin_lock_bh(&socket_client->lock);
323
324 /* while waiting for the lock the socket_client could have been
325 * deleted */
326 if (!socket_client_hash[icmp_packet->uid]) {
327 spin_unlock_bh(&socket_client->lock);
328 kfree(socket_packet);
329 return;
330 }
331
332 list_add_tail(&socket_packet->list, &socket_client->queue_list);
333 socket_client->queue_len++;
334
335 if (socket_client->queue_len > 100) {
336 socket_packet = list_first_entry(&socket_client->queue_list,
337 struct socket_packet, list);
338
339 list_del(&socket_packet->list);
340 kfree(socket_packet);
341 socket_client->queue_len--;
342 }
343
344 spin_unlock_bh(&socket_client->lock);
345
346 wake_up(&socket_client->queue_wait);
347}
348
349void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
350 size_t icmp_len)
351{
352 struct socket_client *hash = socket_client_hash[icmp_packet->uid];
353
354 if (hash)
355 bat_socket_add_packet(hash, icmp_packet, icmp_len);
356}