blob: 319a7ccf6efa803075515104d96256d2b786707b [file] [log] [blame]
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001/*
Sven Eckelmann64afe352011-01-27 10:38:15 +01002 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00003 *
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"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000027#include "hash.h"
28#include "originator.h"
29#include "hard-interface.h"
30
31static struct socket_client *socket_client_hash[256];
32
33static void bat_socket_add_packet(struct socket_client *socket_client,
34 struct icmp_packet_rr *icmp_packet,
35 size_t icmp_len);
36
37void bat_socket_init(void)
38{
39 memset(socket_client_hash, 0, sizeof(socket_client_hash));
40}
41
42static int bat_socket_open(struct inode *inode, struct file *file)
43{
44 unsigned int i;
45 struct socket_client *socket_client;
46
47 nonseekable_open(inode, file);
48
49 socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
50
51 if (!socket_client)
52 return -ENOMEM;
53
54 for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
55 if (!socket_client_hash[i]) {
56 socket_client_hash[i] = socket_client;
57 break;
58 }
59 }
60
61 if (i == ARRAY_SIZE(socket_client_hash)) {
62 pr_err("Error - can't add another packet client: "
63 "maximum number of clients reached\n");
64 kfree(socket_client);
65 return -EXFULL;
66 }
67
68 INIT_LIST_HEAD(&socket_client->queue_list);
69 socket_client->queue_len = 0;
70 socket_client->index = i;
71 socket_client->bat_priv = inode->i_private;
72 spin_lock_init(&socket_client->lock);
73 init_waitqueue_head(&socket_client->queue_wait);
74
75 file->private_data = socket_client;
76
77 inc_module_count();
78 return 0;
79}
80
81static int bat_socket_release(struct inode *inode, struct file *file)
82{
83 struct socket_client *socket_client = file->private_data;
84 struct socket_packet *socket_packet;
85 struct list_head *list_pos, *list_pos_tmp;
86
87 spin_lock_bh(&socket_client->lock);
88
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);
93
94 list_del(list_pos);
95 kfree(socket_packet);
96 }
97
98 socket_client_hash[socket_client->index] = NULL;
99 spin_unlock_bh(&socket_client->lock);
100
101 kfree(socket_client);
102 dec_module_count();
103
104 return 0;
105}
106
107static ssize_t bat_socket_read(struct file *file, char __user *buf,
108 size_t count, loff_t *ppos)
109{
110 struct socket_client *socket_client = file->private_data;
111 struct socket_packet *socket_packet;
112 size_t packet_len;
113 int error;
114
115 if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
116 return -EAGAIN;
117
118 if ((!buf) || (count < sizeof(struct icmp_packet)))
119 return -EINVAL;
120
121 if (!access_ok(VERIFY_WRITE, buf, count))
122 return -EFAULT;
123
124 error = wait_event_interruptible(socket_client->queue_wait,
125 socket_client->queue_len);
126
127 if (error)
128 return error;
129
130 spin_lock_bh(&socket_client->lock);
131
132 socket_packet = list_first_entry(&socket_client->queue_list,
133 struct socket_packet, list);
134 list_del(&socket_packet->list);
135 socket_client->queue_len--;
136
137 spin_unlock_bh(&socket_client->lock);
138
139 error = __copy_to_user(buf, &socket_packet->icmp_packet,
140 socket_packet->icmp_len);
141
142 packet_len = socket_packet->icmp_len;
143 kfree(socket_packet);
144
145 if (error)
146 return -EFAULT;
147
148 return packet_len;
149}
150
151static ssize_t bat_socket_write(struct file *file, const char __user *buff,
152 size_t len, loff_t *off)
153{
154 struct socket_client *socket_client = file->private_data;
155 struct bat_priv *bat_priv = socket_client->bat_priv;
156 struct sk_buff *skb;
157 struct icmp_packet_rr *icmp_packet;
158
159 struct orig_node *orig_node;
160 struct batman_if *batman_if;
161 size_t packet_len = sizeof(struct icmp_packet);
162 uint8_t dstaddr[ETH_ALEN];
163
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");
168 return -EINVAL;
169 }
170
171 if (!bat_priv->primary_if)
172 return -EFAULT;
173
174 if (len >= sizeof(struct icmp_packet_rr))
175 packet_len = sizeof(struct icmp_packet_rr);
176
177 skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
178 if (!skb)
179 return -ENOMEM;
180
181 skb_reserve(skb, sizeof(struct ethhdr));
182 icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
183
184 if (!access_ok(VERIFY_READ, buff, packet_len)) {
185 len = -EFAULT;
186 goto free_skb;
187 }
188
189 if (__copy_from_user(icmp_packet, buff, packet_len)) {
190 len = -EFAULT;
191 goto free_skb;
192 }
193
194 if (icmp_packet->packet_type != BAT_ICMP) {
195 bat_dbg(DBG_BATMAN, bat_priv,
196 "Error - can't send packet from char device: "
197 "got bogus packet type (expected: BAT_ICMP)\n");
198 len = -EINVAL;
199 goto free_skb;
200 }
201
202 if (icmp_packet->msg_type != ECHO_REQUEST) {
203 bat_dbg(DBG_BATMAN, bat_priv,
204 "Error - can't send packet from char device: "
205 "got bogus message type (expected: ECHO_REQUEST)\n");
206 len = -EINVAL;
207 goto free_skb;
208 }
209
210 icmp_packet->uid = socket_client->index;
211
212 if (icmp_packet->version != COMPAT_VERSION) {
213 icmp_packet->msg_type = PARAMETER_PROBLEM;
214 icmp_packet->ttl = COMPAT_VERSION;
215 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
216 goto free_skb;
217 }
218
219 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
220 goto dst_unreach;
221
222 spin_lock_bh(&bat_priv->orig_hash_lock);
223 orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
224 compare_orig, choose_orig,
225 icmp_packet->dst));
226
227 if (!orig_node)
228 goto unlock;
229
230 if (!orig_node->router)
231 goto unlock;
232
233 batman_if = orig_node->router->if_incoming;
234 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
235
236 spin_unlock_bh(&bat_priv->orig_hash_lock);
237
238 if (!batman_if)
239 goto dst_unreach;
240
241 if (batman_if->if_status != IF_ACTIVE)
242 goto dst_unreach;
243
244 memcpy(icmp_packet->orig,
245 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
246
247 if (packet_len == sizeof(struct icmp_packet_rr))
248 memcpy(icmp_packet->rr, batman_if->net_dev->dev_addr, ETH_ALEN);
249
250
251 send_skb_packet(skb, batman_if, dstaddr);
252
253 goto out;
254
255unlock:
256 spin_unlock_bh(&bat_priv->orig_hash_lock);
257dst_unreach:
258 icmp_packet->msg_type = DESTINATION_UNREACHABLE;
259 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
260free_skb:
261 kfree_skb(skb);
262out:
263 return len;
264}
265
266static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
267{
268 struct socket_client *socket_client = file->private_data;
269
270 poll_wait(file, &socket_client->queue_wait, wait);
271
272 if (socket_client->queue_len > 0)
273 return POLLIN | POLLRDNORM;
274
275 return 0;
276}
277
278static const struct file_operations fops = {
279 .owner = THIS_MODULE,
280 .open = bat_socket_open,
281 .release = bat_socket_release,
282 .read = bat_socket_read,
283 .write = bat_socket_write,
284 .poll = bat_socket_poll,
285 .llseek = no_llseek,
286};
287
288int bat_socket_setup(struct bat_priv *bat_priv)
289{
290 struct dentry *d;
291
292 if (!bat_priv->debug_dir)
293 goto err;
294
295 d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
296 bat_priv->debug_dir, bat_priv, &fops);
297 if (d)
298 goto err;
299
300 return 0;
301
302err:
303 return 1;
304}
305
306static void bat_socket_add_packet(struct socket_client *socket_client,
307 struct icmp_packet_rr *icmp_packet,
308 size_t icmp_len)
309{
310 struct socket_packet *socket_packet;
311
312 socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
313
314 if (!socket_packet)
315 return;
316
317 INIT_LIST_HEAD(&socket_packet->list);
318 memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
319 socket_packet->icmp_len = icmp_len;
320
321 spin_lock_bh(&socket_client->lock);
322
323 /* while waiting for the lock the socket_client could have been
324 * deleted */
325 if (!socket_client_hash[icmp_packet->uid]) {
326 spin_unlock_bh(&socket_client->lock);
327 kfree(socket_packet);
328 return;
329 }
330
331 list_add_tail(&socket_packet->list, &socket_client->queue_list);
332 socket_client->queue_len++;
333
334 if (socket_client->queue_len > 100) {
335 socket_packet = list_first_entry(&socket_client->queue_list,
336 struct socket_packet, list);
337
338 list_del(&socket_packet->list);
339 kfree(socket_packet);
340 socket_client->queue_len--;
341 }
342
343 spin_unlock_bh(&socket_client->lock);
344
345 wake_up(&socket_client->queue_wait);
346}
347
348void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
349 size_t icmp_len)
350{
351 struct socket_client *hash = socket_client_hash[icmp_packet->uid];
352
353 if (hash)
354 bat_socket_add_packet(hash, icmp_packet, icmp_len);
355}