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0046b040 | 1 | /* Copyright (C) 2007-2016 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 | ||
1e2c2a4f | 18 | #include "icmp_socket.h" |
c6c8fea2 | 19 | #include "main.h" |
1e2c2a4f SE |
20 | |
21 | #include <linux/atomic.h> | |
22 | #include <linux/compiler.h> | |
c6c8fea2 | 23 | #include <linux/debugfs.h> |
1e2c2a4f SE |
24 | #include <linux/errno.h> |
25 | #include <linux/etherdevice.h> | |
26 | #include <linux/export.h> | |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/if_ether.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/list.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/pkt_sched.h> | |
35 | #include <linux/poll.h> | |
36 | #include <linux/printk.h> | |
37 | #include <linux/sched.h> /* for linux/wait.h */ | |
38 | #include <linux/skbuff.h> | |
c6c8fea2 | 39 | #include <linux/slab.h> |
1e2c2a4f SE |
40 | #include <linux/spinlock.h> |
41 | #include <linux/stat.h> | |
42 | #include <linux/stddef.h> | |
43 | #include <linux/string.h> | |
44 | #include <linux/uaccess.h> | |
45 | #include <linux/wait.h> | |
46 | ||
c6c8fea2 | 47 | #include "hard-interface.h" |
ba412080 | 48 | #include "log.h" |
1e2c2a4f SE |
49 | #include "originator.h" |
50 | #include "packet.h" | |
51 | #include "send.h" | |
c6c8fea2 | 52 | |
56303d34 | 53 | static struct batadv_socket_client *batadv_socket_client_hash[256]; |
c6c8fea2 | 54 | |
56303d34 | 55 | static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, |
da6b8c20 | 56 | struct batadv_icmp_header *icmph, |
af4447f6 | 57 | size_t icmp_len); |
c6c8fea2 | 58 | |
9039dc7e | 59 | void batadv_socket_init(void) |
c6c8fea2 | 60 | { |
af4447f6 | 61 | memset(batadv_socket_client_hash, 0, sizeof(batadv_socket_client_hash)); |
c6c8fea2 SE |
62 | } |
63 | ||
af4447f6 | 64 | static int batadv_socket_open(struct inode *inode, struct file *file) |
c6c8fea2 SE |
65 | { |
66 | unsigned int i; | |
56303d34 | 67 | struct batadv_socket_client *socket_client; |
c6c8fea2 | 68 | |
bd5b80d5 SE |
69 | if (!try_module_get(THIS_MODULE)) |
70 | return -EBUSY; | |
71 | ||
c6c8fea2 SE |
72 | nonseekable_open(inode, file); |
73 | ||
704509b8 | 74 | socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL); |
bd5b80d5 SE |
75 | if (!socket_client) { |
76 | module_put(THIS_MODULE); | |
c6c8fea2 | 77 | return -ENOMEM; |
bd5b80d5 | 78 | } |
c6c8fea2 | 79 | |
af4447f6 SE |
80 | for (i = 0; i < ARRAY_SIZE(batadv_socket_client_hash); i++) { |
81 | if (!batadv_socket_client_hash[i]) { | |
82 | batadv_socket_client_hash[i] = socket_client; | |
c6c8fea2 SE |
83 | break; |
84 | } | |
85 | } | |
86 | ||
af4447f6 | 87 | if (i == ARRAY_SIZE(batadv_socket_client_hash)) { |
86ceb360 | 88 | pr_err("Error - can't add another packet client: maximum number of clients reached\n"); |
c6c8fea2 | 89 | kfree(socket_client); |
bd5b80d5 | 90 | module_put(THIS_MODULE); |
c6c8fea2 SE |
91 | return -EXFULL; |
92 | } | |
93 | ||
94 | INIT_LIST_HEAD(&socket_client->queue_list); | |
95 | socket_client->queue_len = 0; | |
96 | socket_client->index = i; | |
97 | socket_client->bat_priv = inode->i_private; | |
98 | spin_lock_init(&socket_client->lock); | |
99 | init_waitqueue_head(&socket_client->queue_wait); | |
100 | ||
101 | file->private_data = socket_client; | |
102 | ||
c6c8fea2 SE |
103 | return 0; |
104 | } | |
105 | ||
af4447f6 | 106 | static int batadv_socket_release(struct inode *inode, struct file *file) |
c6c8fea2 | 107 | { |
fb1f23ea GT |
108 | struct batadv_socket_client *client = file->private_data; |
109 | struct batadv_socket_packet *packet, *tmp; | |
c6c8fea2 | 110 | |
fb1f23ea | 111 | spin_lock_bh(&client->lock); |
c6c8fea2 SE |
112 | |
113 | /* for all packets in the queue ... */ | |
fb1f23ea GT |
114 | list_for_each_entry_safe(packet, tmp, &client->queue_list, list) { |
115 | list_del(&packet->list); | |
116 | kfree(packet); | |
c6c8fea2 SE |
117 | } |
118 | ||
fb1f23ea GT |
119 | batadv_socket_client_hash[client->index] = NULL; |
120 | spin_unlock_bh(&client->lock); | |
c6c8fea2 | 121 | |
fb1f23ea | 122 | kfree(client); |
bd5b80d5 | 123 | module_put(THIS_MODULE); |
c6c8fea2 SE |
124 | |
125 | return 0; | |
126 | } | |
127 | ||
af4447f6 SE |
128 | static ssize_t batadv_socket_read(struct file *file, char __user *buf, |
129 | size_t count, loff_t *ppos) | |
c6c8fea2 | 130 | { |
56303d34 SE |
131 | struct batadv_socket_client *socket_client = file->private_data; |
132 | struct batadv_socket_packet *socket_packet; | |
c6c8fea2 SE |
133 | size_t packet_len; |
134 | int error; | |
135 | ||
136 | if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0)) | |
137 | return -EAGAIN; | |
138 | ||
96412690 | 139 | if ((!buf) || (count < sizeof(struct batadv_icmp_packet))) |
c6c8fea2 SE |
140 | return -EINVAL; |
141 | ||
142 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
143 | return -EFAULT; | |
144 | ||
145 | error = wait_event_interruptible(socket_client->queue_wait, | |
146 | socket_client->queue_len); | |
147 | ||
148 | if (error) | |
149 | return error; | |
150 | ||
151 | spin_lock_bh(&socket_client->lock); | |
152 | ||
153 | socket_packet = list_first_entry(&socket_client->queue_list, | |
56303d34 | 154 | struct batadv_socket_packet, list); |
c6c8fea2 SE |
155 | list_del(&socket_packet->list); |
156 | socket_client->queue_len--; | |
157 | ||
158 | spin_unlock_bh(&socket_client->lock); | |
159 | ||
b5a1eeef SE |
160 | packet_len = min(count, socket_packet->icmp_len); |
161 | error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len); | |
c6c8fea2 | 162 | |
c6c8fea2 SE |
163 | kfree(socket_packet); |
164 | ||
165 | if (error) | |
166 | return -EFAULT; | |
167 | ||
168 | return packet_len; | |
169 | } | |
170 | ||
af4447f6 SE |
171 | static ssize_t batadv_socket_write(struct file *file, const char __user *buff, |
172 | size_t len, loff_t *off) | |
c6c8fea2 | 173 | { |
56303d34 SE |
174 | struct batadv_socket_client *socket_client = file->private_data; |
175 | struct batadv_priv *bat_priv = socket_client->bat_priv; | |
176 | struct batadv_hard_iface *primary_if = NULL; | |
c6c8fea2 | 177 | struct sk_buff *skb; |
da6b8c20 SW |
178 | struct batadv_icmp_packet_rr *icmp_packet_rr; |
179 | struct batadv_icmp_header *icmp_header; | |
56303d34 SE |
180 | struct batadv_orig_node *orig_node = NULL; |
181 | struct batadv_neigh_node *neigh_node = NULL; | |
96412690 | 182 | size_t packet_len = sizeof(struct batadv_icmp_packet); |
6b5e971a | 183 | u8 *addr; |
c6c8fea2 | 184 | |
da6b8c20 | 185 | if (len < sizeof(struct batadv_icmp_header)) { |
39c75a51 | 186 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 187 | "Error - can't send packet from char device: invalid packet size\n"); |
c6c8fea2 SE |
188 | return -EINVAL; |
189 | } | |
190 | ||
e5d89254 | 191 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
192 | |
193 | if (!primary_if) { | |
194 | len = -EFAULT; | |
195 | goto out; | |
196 | } | |
c6c8fea2 | 197 | |
da6b8c20 SW |
198 | if (len >= BATADV_ICMP_MAX_PACKET_SIZE) |
199 | packet_len = BATADV_ICMP_MAX_PACKET_SIZE; | |
200 | else | |
201 | packet_len = len; | |
c6c8fea2 | 202 | |
41ab6c48 | 203 | skb = netdev_alloc_skb_ip_align(NULL, packet_len + ETH_HLEN); |
32ae9b22 ML |
204 | if (!skb) { |
205 | len = -ENOMEM; | |
206 | goto out; | |
207 | } | |
c6c8fea2 | 208 | |
c54f38c9 | 209 | skb->priority = TC_PRIO_CONTROL; |
41ab6c48 | 210 | skb_reserve(skb, ETH_HLEN); |
da6b8c20 | 211 | icmp_header = (struct batadv_icmp_header *)skb_put(skb, packet_len); |
c6c8fea2 | 212 | |
da6b8c20 | 213 | if (copy_from_user(icmp_header, buff, packet_len)) { |
c6c8fea2 SE |
214 | len = -EFAULT; |
215 | goto free_skb; | |
216 | } | |
217 | ||
a40d9b07 | 218 | if (icmp_header->packet_type != BATADV_ICMP) { |
39c75a51 | 219 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 220 | "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n"); |
c6c8fea2 SE |
221 | len = -EINVAL; |
222 | goto free_skb; | |
223 | } | |
224 | ||
da6b8c20 SW |
225 | switch (icmp_header->msg_type) { |
226 | case BATADV_ECHO_REQUEST: | |
227 | if (len < sizeof(struct batadv_icmp_packet)) { | |
228 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
229 | "Error - can't send packet from char device: invalid packet size\n"); | |
230 | len = -EINVAL; | |
231 | goto free_skb; | |
232 | } | |
233 | ||
234 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
235 | goto dst_unreach; | |
236 | ||
237 | orig_node = batadv_orig_hash_find(bat_priv, icmp_header->dst); | |
238 | if (!orig_node) | |
239 | goto dst_unreach; | |
240 | ||
7351a482 SW |
241 | neigh_node = batadv_orig_router_get(orig_node, |
242 | BATADV_IF_DEFAULT); | |
da6b8c20 SW |
243 | if (!neigh_node) |
244 | goto dst_unreach; | |
245 | ||
246 | if (!neigh_node->if_incoming) | |
247 | goto dst_unreach; | |
248 | ||
249 | if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE) | |
250 | goto dst_unreach; | |
251 | ||
252 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header; | |
8fdd0153 AQ |
253 | if (packet_len == sizeof(*icmp_packet_rr)) { |
254 | addr = neigh_node->if_incoming->net_dev->dev_addr; | |
255 | ether_addr_copy(icmp_packet_rr->rr[0], addr); | |
256 | } | |
da6b8c20 SW |
257 | |
258 | break; | |
259 | default: | |
39c75a51 | 260 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
da6b8c20 | 261 | "Error - can't send packet from char device: got unknown message type\n"); |
c6c8fea2 SE |
262 | len = -EINVAL; |
263 | goto free_skb; | |
264 | } | |
265 | ||
da6b8c20 | 266 | icmp_header->uid = socket_client->index; |
c6c8fea2 | 267 | |
a40d9b07 | 268 | if (icmp_header->version != BATADV_COMPAT_VERSION) { |
da6b8c20 | 269 | icmp_header->msg_type = BATADV_PARAMETER_PROBLEM; |
a40d9b07 | 270 | icmp_header->version = BATADV_COMPAT_VERSION; |
da6b8c20 | 271 | batadv_socket_add_packet(socket_client, icmp_header, |
af4447f6 | 272 | packet_len); |
c6c8fea2 SE |
273 | goto free_skb; |
274 | } | |
275 | ||
8fdd0153 | 276 | ether_addr_copy(icmp_header->orig, primary_if->net_dev->dev_addr); |
c6c8fea2 | 277 | |
95d39278 | 278 | batadv_send_unicast_skb(skb, neigh_node); |
c6c8fea2 SE |
279 | goto out; |
280 | ||
c6c8fea2 | 281 | dst_unreach: |
da6b8c20 SW |
282 | icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE; |
283 | batadv_socket_add_packet(socket_client, icmp_header, packet_len); | |
c6c8fea2 SE |
284 | free_skb: |
285 | kfree_skb(skb); | |
286 | out: | |
32ae9b22 | 287 | if (primary_if) |
82047ad7 | 288 | batadv_hardif_put(primary_if); |
44524fcd | 289 | if (neigh_node) |
25bb2509 | 290 | batadv_neigh_node_put(neigh_node); |
44524fcd | 291 | if (orig_node) |
5d967310 | 292 | batadv_orig_node_put(orig_node); |
c6c8fea2 SE |
293 | return len; |
294 | } | |
295 | ||
af4447f6 | 296 | static unsigned int batadv_socket_poll(struct file *file, poll_table *wait) |
c6c8fea2 | 297 | { |
56303d34 | 298 | struct batadv_socket_client *socket_client = file->private_data; |
c6c8fea2 SE |
299 | |
300 | poll_wait(file, &socket_client->queue_wait, wait); | |
301 | ||
302 | if (socket_client->queue_len > 0) | |
303 | return POLLIN | POLLRDNORM; | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
af4447f6 | 308 | static const struct file_operations batadv_fops = { |
c6c8fea2 | 309 | .owner = THIS_MODULE, |
af4447f6 SE |
310 | .open = batadv_socket_open, |
311 | .release = batadv_socket_release, | |
312 | .read = batadv_socket_read, | |
313 | .write = batadv_socket_write, | |
314 | .poll = batadv_socket_poll, | |
c6c8fea2 SE |
315 | .llseek = no_llseek, |
316 | }; | |
317 | ||
56303d34 | 318 | int batadv_socket_setup(struct batadv_priv *bat_priv) |
c6c8fea2 SE |
319 | { |
320 | struct dentry *d; | |
321 | ||
322 | if (!bat_priv->debug_dir) | |
323 | goto err; | |
324 | ||
64346643 | 325 | d = debugfs_create_file(BATADV_ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR, |
af4447f6 | 326 | bat_priv->debug_dir, bat_priv, &batadv_fops); |
5346c35e | 327 | if (!d) |
c6c8fea2 SE |
328 | goto err; |
329 | ||
330 | return 0; | |
331 | ||
332 | err: | |
5346c35e | 333 | return -ENOMEM; |
c6c8fea2 SE |
334 | } |
335 | ||
da6b8c20 | 336 | /** |
6d030de8 | 337 | * batadv_socket_add_packet - schedule an icmp packet to be sent to |
34473822 | 338 | * userspace on an icmp socket. |
da6b8c20 SW |
339 | * @socket_client: the socket this packet belongs to |
340 | * @icmph: pointer to the header of the icmp packet | |
341 | * @icmp_len: total length of the icmp packet | |
342 | */ | |
56303d34 | 343 | static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, |
da6b8c20 | 344 | struct batadv_icmp_header *icmph, |
af4447f6 | 345 | size_t icmp_len) |
c6c8fea2 | 346 | { |
56303d34 | 347 | struct batadv_socket_packet *socket_packet; |
da6b8c20 | 348 | size_t len; |
c6c8fea2 | 349 | |
704509b8 | 350 | socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC); |
c6c8fea2 SE |
351 | |
352 | if (!socket_packet) | |
353 | return; | |
354 | ||
da6b8c20 SW |
355 | len = icmp_len; |
356 | /* check the maximum length before filling the buffer */ | |
357 | if (len > sizeof(socket_packet->icmp_packet)) | |
358 | len = sizeof(socket_packet->icmp_packet); | |
359 | ||
c6c8fea2 | 360 | INIT_LIST_HEAD(&socket_packet->list); |
da6b8c20 SW |
361 | memcpy(&socket_packet->icmp_packet, icmph, len); |
362 | socket_packet->icmp_len = len; | |
c6c8fea2 SE |
363 | |
364 | spin_lock_bh(&socket_client->lock); | |
365 | ||
366 | /* while waiting for the lock the socket_client could have been | |
9cfc7bd6 SE |
367 | * deleted |
368 | */ | |
da6b8c20 | 369 | if (!batadv_socket_client_hash[icmph->uid]) { |
c6c8fea2 SE |
370 | spin_unlock_bh(&socket_client->lock); |
371 | kfree(socket_packet); | |
372 | return; | |
373 | } | |
374 | ||
375 | list_add_tail(&socket_packet->list, &socket_client->queue_list); | |
376 | socket_client->queue_len++; | |
377 | ||
378 | if (socket_client->queue_len > 100) { | |
379 | socket_packet = list_first_entry(&socket_client->queue_list, | |
56303d34 SE |
380 | struct batadv_socket_packet, |
381 | list); | |
c6c8fea2 SE |
382 | |
383 | list_del(&socket_packet->list); | |
384 | kfree(socket_packet); | |
385 | socket_client->queue_len--; | |
386 | } | |
387 | ||
388 | spin_unlock_bh(&socket_client->lock); | |
389 | ||
390 | wake_up(&socket_client->queue_wait); | |
391 | } | |
392 | ||
da6b8c20 SW |
393 | /** |
394 | * batadv_socket_receive_packet - schedule an icmp packet to be received | |
395 | * locally and sent to userspace. | |
396 | * @icmph: pointer to the header of the icmp packet | |
397 | * @icmp_len: total length of the icmp packet | |
398 | */ | |
399 | void batadv_socket_receive_packet(struct batadv_icmp_header *icmph, | |
9039dc7e | 400 | size_t icmp_len) |
c6c8fea2 | 401 | { |
56303d34 | 402 | struct batadv_socket_client *hash; |
c6c8fea2 | 403 | |
da6b8c20 | 404 | hash = batadv_socket_client_hash[icmph->uid]; |
c6c8fea2 | 405 | if (hash) |
da6b8c20 | 406 | batadv_socket_add_packet(hash, icmph, icmp_len); |
c6c8fea2 | 407 | } |