Commit | Line | Data |
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0b873931 | 1 | /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
18 | #include "main.h" | |
19 | #include <linux/debugfs.h> | |
20 | #include <linux/slab.h> | |
21 | #include "icmp_socket.h" | |
22 | #include "send.h" | |
c6c8fea2 SE |
23 | #include "hash.h" |
24 | #include "originator.h" | |
25 | #include "hard-interface.h" | |
26 | ||
56303d34 | 27 | static struct batadv_socket_client *batadv_socket_client_hash[256]; |
c6c8fea2 | 28 | |
56303d34 | 29 | static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, |
da6b8c20 | 30 | struct batadv_icmp_header *icmph, |
af4447f6 | 31 | size_t icmp_len); |
c6c8fea2 | 32 | |
9039dc7e | 33 | void batadv_socket_init(void) |
c6c8fea2 | 34 | { |
af4447f6 | 35 | memset(batadv_socket_client_hash, 0, sizeof(batadv_socket_client_hash)); |
c6c8fea2 SE |
36 | } |
37 | ||
af4447f6 | 38 | static int batadv_socket_open(struct inode *inode, struct file *file) |
c6c8fea2 SE |
39 | { |
40 | unsigned int i; | |
56303d34 | 41 | struct batadv_socket_client *socket_client; |
c6c8fea2 | 42 | |
bd5b80d5 SE |
43 | if (!try_module_get(THIS_MODULE)) |
44 | return -EBUSY; | |
45 | ||
c6c8fea2 SE |
46 | nonseekable_open(inode, file); |
47 | ||
704509b8 | 48 | socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL); |
bd5b80d5 SE |
49 | if (!socket_client) { |
50 | module_put(THIS_MODULE); | |
c6c8fea2 | 51 | return -ENOMEM; |
bd5b80d5 | 52 | } |
c6c8fea2 | 53 | |
af4447f6 SE |
54 | for (i = 0; i < ARRAY_SIZE(batadv_socket_client_hash); i++) { |
55 | if (!batadv_socket_client_hash[i]) { | |
56 | batadv_socket_client_hash[i] = socket_client; | |
c6c8fea2 SE |
57 | break; |
58 | } | |
59 | } | |
60 | ||
af4447f6 | 61 | if (i == ARRAY_SIZE(batadv_socket_client_hash)) { |
86ceb360 | 62 | pr_err("Error - can't add another packet client: maximum number of clients reached\n"); |
c6c8fea2 | 63 | kfree(socket_client); |
bd5b80d5 | 64 | module_put(THIS_MODULE); |
c6c8fea2 SE |
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 | ||
c6c8fea2 SE |
77 | return 0; |
78 | } | |
79 | ||
af4447f6 | 80 | static int batadv_socket_release(struct inode *inode, struct file *file) |
c6c8fea2 | 81 | { |
56303d34 SE |
82 | struct batadv_socket_client *socket_client = file->private_data; |
83 | struct batadv_socket_packet *socket_packet; | |
c6c8fea2 SE |
84 | struct list_head *list_pos, *list_pos_tmp; |
85 | ||
86 | spin_lock_bh(&socket_client->lock); | |
87 | ||
88 | /* for all packets in the queue ... */ | |
89 | list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) { | |
90 | socket_packet = list_entry(list_pos, | |
56303d34 | 91 | struct batadv_socket_packet, list); |
c6c8fea2 SE |
92 | |
93 | list_del(list_pos); | |
94 | kfree(socket_packet); | |
95 | } | |
96 | ||
af4447f6 | 97 | batadv_socket_client_hash[socket_client->index] = NULL; |
c6c8fea2 SE |
98 | spin_unlock_bh(&socket_client->lock); |
99 | ||
100 | kfree(socket_client); | |
bd5b80d5 | 101 | module_put(THIS_MODULE); |
c6c8fea2 SE |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
af4447f6 SE |
106 | static ssize_t batadv_socket_read(struct file *file, char __user *buf, |
107 | size_t count, loff_t *ppos) | |
c6c8fea2 | 108 | { |
56303d34 SE |
109 | struct batadv_socket_client *socket_client = file->private_data; |
110 | struct batadv_socket_packet *socket_packet; | |
c6c8fea2 SE |
111 | size_t packet_len; |
112 | int error; | |
113 | ||
114 | if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0)) | |
115 | return -EAGAIN; | |
116 | ||
96412690 | 117 | if ((!buf) || (count < sizeof(struct batadv_icmp_packet))) |
c6c8fea2 SE |
118 | return -EINVAL; |
119 | ||
120 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
121 | return -EFAULT; | |
122 | ||
123 | error = wait_event_interruptible(socket_client->queue_wait, | |
124 | socket_client->queue_len); | |
125 | ||
126 | if (error) | |
127 | return error; | |
128 | ||
129 | spin_lock_bh(&socket_client->lock); | |
130 | ||
131 | socket_packet = list_first_entry(&socket_client->queue_list, | |
56303d34 | 132 | struct batadv_socket_packet, list); |
c6c8fea2 SE |
133 | list_del(&socket_packet->list); |
134 | socket_client->queue_len--; | |
135 | ||
136 | spin_unlock_bh(&socket_client->lock); | |
137 | ||
b5a1eeef SE |
138 | packet_len = min(count, socket_packet->icmp_len); |
139 | error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len); | |
c6c8fea2 | 140 | |
c6c8fea2 SE |
141 | kfree(socket_packet); |
142 | ||
143 | if (error) | |
144 | return -EFAULT; | |
145 | ||
146 | return packet_len; | |
147 | } | |
148 | ||
af4447f6 SE |
149 | static ssize_t batadv_socket_write(struct file *file, const char __user *buff, |
150 | size_t len, loff_t *off) | |
c6c8fea2 | 151 | { |
56303d34 SE |
152 | struct batadv_socket_client *socket_client = file->private_data; |
153 | struct batadv_priv *bat_priv = socket_client->bat_priv; | |
154 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 155 | struct sk_buff *skb; |
da6b8c20 SW |
156 | struct batadv_icmp_packet_rr *icmp_packet_rr; |
157 | struct batadv_icmp_header *icmp_header; | |
56303d34 SE |
158 | struct batadv_orig_node *orig_node = NULL; |
159 | struct batadv_neigh_node *neigh_node = NULL; | |
96412690 | 160 | size_t packet_len = sizeof(struct batadv_icmp_packet); |
c6c8fea2 | 161 | |
da6b8c20 | 162 | if (len < sizeof(struct batadv_icmp_header)) { |
39c75a51 | 163 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 164 | "Error - can't send packet from char device: invalid packet size\n"); |
c6c8fea2 SE |
165 | return -EINVAL; |
166 | } | |
167 | ||
e5d89254 | 168 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
169 | |
170 | if (!primary_if) { | |
171 | len = -EFAULT; | |
172 | goto out; | |
173 | } | |
c6c8fea2 | 174 | |
da6b8c20 SW |
175 | if (len >= BATADV_ICMP_MAX_PACKET_SIZE) |
176 | packet_len = BATADV_ICMP_MAX_PACKET_SIZE; | |
177 | else | |
178 | packet_len = len; | |
c6c8fea2 | 179 | |
41ab6c48 | 180 | skb = netdev_alloc_skb_ip_align(NULL, packet_len + ETH_HLEN); |
32ae9b22 ML |
181 | if (!skb) { |
182 | len = -ENOMEM; | |
183 | goto out; | |
184 | } | |
c6c8fea2 | 185 | |
c54f38c9 | 186 | skb->priority = TC_PRIO_CONTROL; |
41ab6c48 | 187 | skb_reserve(skb, ETH_HLEN); |
da6b8c20 | 188 | icmp_header = (struct batadv_icmp_header *)skb_put(skb, packet_len); |
c6c8fea2 | 189 | |
da6b8c20 | 190 | if (copy_from_user(icmp_header, buff, packet_len)) { |
c6c8fea2 SE |
191 | len = -EFAULT; |
192 | goto free_skb; | |
193 | } | |
194 | ||
a40d9b07 | 195 | if (icmp_header->packet_type != BATADV_ICMP) { |
39c75a51 | 196 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 197 | "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n"); |
c6c8fea2 SE |
198 | len = -EINVAL; |
199 | goto free_skb; | |
200 | } | |
201 | ||
da6b8c20 SW |
202 | switch (icmp_header->msg_type) { |
203 | case BATADV_ECHO_REQUEST: | |
204 | if (len < sizeof(struct batadv_icmp_packet)) { | |
205 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
206 | "Error - can't send packet from char device: invalid packet size\n"); | |
207 | len = -EINVAL; | |
208 | goto free_skb; | |
209 | } | |
210 | ||
211 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
212 | goto dst_unreach; | |
213 | ||
214 | orig_node = batadv_orig_hash_find(bat_priv, icmp_header->dst); | |
215 | if (!orig_node) | |
216 | goto dst_unreach; | |
217 | ||
218 | neigh_node = batadv_orig_node_get_router(orig_node); | |
219 | if (!neigh_node) | |
220 | goto dst_unreach; | |
221 | ||
222 | if (!neigh_node->if_incoming) | |
223 | goto dst_unreach; | |
224 | ||
225 | if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE) | |
226 | goto dst_unreach; | |
227 | ||
228 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header; | |
229 | if (packet_len == sizeof(*icmp_packet_rr)) | |
230 | memcpy(icmp_packet_rr->rr, | |
231 | neigh_node->if_incoming->net_dev->dev_addr, | |
232 | ETH_ALEN); | |
233 | ||
234 | break; | |
235 | default: | |
39c75a51 | 236 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
da6b8c20 | 237 | "Error - can't send packet from char device: got unknown message type\n"); |
c6c8fea2 SE |
238 | len = -EINVAL; |
239 | goto free_skb; | |
240 | } | |
241 | ||
da6b8c20 | 242 | icmp_header->uid = socket_client->index; |
c6c8fea2 | 243 | |
a40d9b07 | 244 | if (icmp_header->version != BATADV_COMPAT_VERSION) { |
da6b8c20 | 245 | icmp_header->msg_type = BATADV_PARAMETER_PROBLEM; |
a40d9b07 | 246 | icmp_header->version = BATADV_COMPAT_VERSION; |
da6b8c20 | 247 | batadv_socket_add_packet(socket_client, icmp_header, |
af4447f6 | 248 | packet_len); |
c6c8fea2 SE |
249 | goto free_skb; |
250 | } | |
251 | ||
da6b8c20 | 252 | memcpy(icmp_header->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 253 | |
9455e34c | 254 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
c6c8fea2 SE |
255 | goto out; |
256 | ||
c6c8fea2 | 257 | dst_unreach: |
da6b8c20 SW |
258 | icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE; |
259 | batadv_socket_add_packet(socket_client, icmp_header, packet_len); | |
c6c8fea2 SE |
260 | free_skb: |
261 | kfree_skb(skb); | |
262 | out: | |
32ae9b22 | 263 | if (primary_if) |
e5d89254 | 264 | batadv_hardif_free_ref(primary_if); |
44524fcd | 265 | if (neigh_node) |
7d211efc | 266 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 267 | if (orig_node) |
7d211efc | 268 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
269 | return len; |
270 | } | |
271 | ||
af4447f6 | 272 | static unsigned int batadv_socket_poll(struct file *file, poll_table *wait) |
c6c8fea2 | 273 | { |
56303d34 | 274 | struct batadv_socket_client *socket_client = file->private_data; |
c6c8fea2 SE |
275 | |
276 | poll_wait(file, &socket_client->queue_wait, wait); | |
277 | ||
278 | if (socket_client->queue_len > 0) | |
279 | return POLLIN | POLLRDNORM; | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
af4447f6 | 284 | static const struct file_operations batadv_fops = { |
c6c8fea2 | 285 | .owner = THIS_MODULE, |
af4447f6 SE |
286 | .open = batadv_socket_open, |
287 | .release = batadv_socket_release, | |
288 | .read = batadv_socket_read, | |
289 | .write = batadv_socket_write, | |
290 | .poll = batadv_socket_poll, | |
c6c8fea2 SE |
291 | .llseek = no_llseek, |
292 | }; | |
293 | ||
56303d34 | 294 | int batadv_socket_setup(struct batadv_priv *bat_priv) |
c6c8fea2 SE |
295 | { |
296 | struct dentry *d; | |
297 | ||
298 | if (!bat_priv->debug_dir) | |
299 | goto err; | |
300 | ||
64346643 | 301 | d = debugfs_create_file(BATADV_ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR, |
af4447f6 | 302 | bat_priv->debug_dir, bat_priv, &batadv_fops); |
5346c35e | 303 | if (!d) |
c6c8fea2 SE |
304 | goto err; |
305 | ||
306 | return 0; | |
307 | ||
308 | err: | |
5346c35e | 309 | return -ENOMEM; |
c6c8fea2 SE |
310 | } |
311 | ||
da6b8c20 SW |
312 | /** |
313 | * batadv_socket_receive_packet - schedule an icmp packet to be sent to userspace | |
314 | * on an icmp socket. | |
315 | * @socket_client: the socket this packet belongs to | |
316 | * @icmph: pointer to the header of the icmp packet | |
317 | * @icmp_len: total length of the icmp packet | |
318 | */ | |
56303d34 | 319 | static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, |
da6b8c20 | 320 | struct batadv_icmp_header *icmph, |
af4447f6 | 321 | size_t icmp_len) |
c6c8fea2 | 322 | { |
56303d34 | 323 | struct batadv_socket_packet *socket_packet; |
da6b8c20 | 324 | size_t len; |
c6c8fea2 | 325 | |
704509b8 | 326 | socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC); |
c6c8fea2 SE |
327 | |
328 | if (!socket_packet) | |
329 | return; | |
330 | ||
da6b8c20 SW |
331 | len = icmp_len; |
332 | /* check the maximum length before filling the buffer */ | |
333 | if (len > sizeof(socket_packet->icmp_packet)) | |
334 | len = sizeof(socket_packet->icmp_packet); | |
335 | ||
c6c8fea2 | 336 | INIT_LIST_HEAD(&socket_packet->list); |
da6b8c20 SW |
337 | memcpy(&socket_packet->icmp_packet, icmph, len); |
338 | socket_packet->icmp_len = len; | |
c6c8fea2 SE |
339 | |
340 | spin_lock_bh(&socket_client->lock); | |
341 | ||
342 | /* while waiting for the lock the socket_client could have been | |
9cfc7bd6 SE |
343 | * deleted |
344 | */ | |
da6b8c20 | 345 | if (!batadv_socket_client_hash[icmph->uid]) { |
c6c8fea2 SE |
346 | spin_unlock_bh(&socket_client->lock); |
347 | kfree(socket_packet); | |
348 | return; | |
349 | } | |
350 | ||
351 | list_add_tail(&socket_packet->list, &socket_client->queue_list); | |
352 | socket_client->queue_len++; | |
353 | ||
354 | if (socket_client->queue_len > 100) { | |
355 | socket_packet = list_first_entry(&socket_client->queue_list, | |
56303d34 SE |
356 | struct batadv_socket_packet, |
357 | list); | |
c6c8fea2 SE |
358 | |
359 | list_del(&socket_packet->list); | |
360 | kfree(socket_packet); | |
361 | socket_client->queue_len--; | |
362 | } | |
363 | ||
364 | spin_unlock_bh(&socket_client->lock); | |
365 | ||
366 | wake_up(&socket_client->queue_wait); | |
367 | } | |
368 | ||
da6b8c20 SW |
369 | /** |
370 | * batadv_socket_receive_packet - schedule an icmp packet to be received | |
371 | * locally and sent to userspace. | |
372 | * @icmph: pointer to the header of the icmp packet | |
373 | * @icmp_len: total length of the icmp packet | |
374 | */ | |
375 | void batadv_socket_receive_packet(struct batadv_icmp_header *icmph, | |
9039dc7e | 376 | size_t icmp_len) |
c6c8fea2 | 377 | { |
56303d34 | 378 | struct batadv_socket_client *hash; |
c6c8fea2 | 379 | |
da6b8c20 | 380 | hash = batadv_socket_client_hash[icmph->uid]; |
c6c8fea2 | 381 | if (hash) |
da6b8c20 | 382 | batadv_socket_add_packet(hash, icmph, icmp_len); |
c6c8fea2 | 383 | } |