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c6c8fea2 SE |
1 | /* |
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 | ||
32 | static struct socket_client *socket_client_hash[256]; | |
33 | ||
34 | static void bat_socket_add_packet(struct socket_client *socket_client, | |
35 | struct icmp_packet_rr *icmp_packet, | |
36 | size_t icmp_len); | |
37 | ||
38 | void bat_socket_init(void) | |
39 | { | |
40 | memset(socket_client_hash, 0, sizeof(socket_client_hash)); | |
41 | } | |
42 | ||
43 | static 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 | ||
82 | static 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 | ||
108 | static 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 | ||
152 | static 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 | ||
256 | unlock: | |
257 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
258 | dst_unreach: | |
259 | icmp_packet->msg_type = DESTINATION_UNREACHABLE; | |
260 | bat_socket_add_packet(socket_client, icmp_packet, packet_len); | |
261 | free_skb: | |
262 | kfree_skb(skb); | |
263 | out: | |
264 | return len; | |
265 | } | |
266 | ||
267 | static 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 | ||
279 | static 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 | ||
289 | int 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 | ||
303 | err: | |
304 | return 1; | |
305 | } | |
306 | ||
307 | static 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 | ||
349 | void 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 | } |