Commit | Line | Data |
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c6c8fea2 | 1 | /* |
64afe353 | 2 | * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
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" | |
c6c8fea2 SE |
27 | #include "hash.h" |
28 | #include "originator.h" | |
29 | #include "hard-interface.h" | |
30 | ||
31 | static struct socket_client *socket_client_hash[256]; | |
32 | ||
33 | static void bat_socket_add_packet(struct socket_client *socket_client, | |
34 | struct icmp_packet_rr *icmp_packet, | |
35 | size_t icmp_len); | |
36 | ||
37 | void bat_socket_init(void) | |
38 | { | |
39 | memset(socket_client_hash, 0, sizeof(socket_client_hash)); | |
40 | } | |
41 | ||
42 | static 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 | ||
704509b8 | 49 | socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL); |
c6c8fea2 SE |
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 | ||
81 | static 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 | ||
107 | static 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 | ||
151 | static 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; | |
32ae9b22 | 156 | struct hard_iface *primary_if = NULL; |
c6c8fea2 SE |
157 | struct sk_buff *skb; |
158 | struct icmp_packet_rr *icmp_packet; | |
159 | ||
44524fcd ML |
160 | struct orig_node *orig_node = NULL; |
161 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 | 162 | size_t packet_len = sizeof(struct icmp_packet); |
c6c8fea2 SE |
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 | ||
32ae9b22 ML |
171 | primary_if = primary_if_get_selected(bat_priv); |
172 | ||
173 | if (!primary_if) { | |
174 | len = -EFAULT; | |
175 | goto out; | |
176 | } | |
c6c8fea2 SE |
177 | |
178 | if (len >= sizeof(struct icmp_packet_rr)) | |
179 | packet_len = sizeof(struct icmp_packet_rr); | |
180 | ||
181 | skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr)); | |
32ae9b22 ML |
182 | if (!skb) { |
183 | len = -ENOMEM; | |
184 | goto out; | |
185 | } | |
c6c8fea2 SE |
186 | |
187 | skb_reserve(skb, sizeof(struct ethhdr)); | |
188 | icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len); | |
189 | ||
190 | if (!access_ok(VERIFY_READ, buff, packet_len)) { | |
191 | len = -EFAULT; | |
192 | goto free_skb; | |
193 | } | |
194 | ||
195 | if (__copy_from_user(icmp_packet, buff, packet_len)) { | |
196 | len = -EFAULT; | |
197 | goto free_skb; | |
198 | } | |
199 | ||
200 | if (icmp_packet->packet_type != BAT_ICMP) { | |
201 | bat_dbg(DBG_BATMAN, bat_priv, | |
202 | "Error - can't send packet from char device: " | |
203 | "got bogus packet type (expected: BAT_ICMP)\n"); | |
204 | len = -EINVAL; | |
205 | goto free_skb; | |
206 | } | |
207 | ||
208 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
209 | bat_dbg(DBG_BATMAN, bat_priv, | |
210 | "Error - can't send packet from char device: " | |
211 | "got bogus message type (expected: ECHO_REQUEST)\n"); | |
212 | len = -EINVAL; | |
213 | goto free_skb; | |
214 | } | |
215 | ||
216 | icmp_packet->uid = socket_client->index; | |
217 | ||
218 | if (icmp_packet->version != COMPAT_VERSION) { | |
219 | icmp_packet->msg_type = PARAMETER_PROBLEM; | |
220 | icmp_packet->ttl = COMPAT_VERSION; | |
221 | bat_socket_add_packet(socket_client, icmp_packet, packet_len); | |
222 | goto free_skb; | |
223 | } | |
224 | ||
225 | if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) | |
226 | goto dst_unreach; | |
227 | ||
7aadf889 | 228 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
c6c8fea2 | 229 | if (!orig_node) |
e1a5382f | 230 | goto dst_unreach; |
44524fcd | 231 | |
e1a5382f | 232 | neigh_node = orig_node_get_router(orig_node); |
44524fcd | 233 | if (!neigh_node) |
e1a5382f | 234 | goto dst_unreach; |
c6c8fea2 | 235 | |
d0072609 | 236 | if (!neigh_node->if_incoming) |
c6c8fea2 SE |
237 | goto dst_unreach; |
238 | ||
d0072609 | 239 | if (neigh_node->if_incoming->if_status != IF_ACTIVE) |
c6c8fea2 SE |
240 | goto dst_unreach; |
241 | ||
242 | memcpy(icmp_packet->orig, | |
32ae9b22 | 243 | primary_if->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 SE |
244 | |
245 | if (packet_len == sizeof(struct icmp_packet_rr)) | |
44524fcd | 246 | memcpy(icmp_packet->rr, |
d0072609 | 247 | neigh_node->if_incoming->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 248 | |
d0072609 | 249 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
c6c8fea2 SE |
250 | goto out; |
251 | ||
c6c8fea2 SE |
252 | dst_unreach: |
253 | icmp_packet->msg_type = DESTINATION_UNREACHABLE; | |
254 | bat_socket_add_packet(socket_client, icmp_packet, packet_len); | |
255 | free_skb: | |
256 | kfree_skb(skb); | |
257 | out: | |
32ae9b22 ML |
258 | if (primary_if) |
259 | hardif_free_ref(primary_if); | |
44524fcd ML |
260 | if (neigh_node) |
261 | neigh_node_free_ref(neigh_node); | |
262 | if (orig_node) | |
7b36e8ee | 263 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
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 | ||
704509b8 | 313 | socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC); |
c6c8fea2 SE |
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 | } |