]>
Commit | Line | Data |
---|---|---|
c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 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)) { | |
86ceb360 | 62 | pr_err("Error - can't add another packet client: maximum number of clients reached\n"); |
c6c8fea2 SE |
63 | kfree(socket_client); |
64 | return -EXFULL; | |
65 | } | |
66 | ||
67 | INIT_LIST_HEAD(&socket_client->queue_list); | |
68 | socket_client->queue_len = 0; | |
69 | socket_client->index = i; | |
70 | socket_client->bat_priv = inode->i_private; | |
71 | spin_lock_init(&socket_client->lock); | |
72 | init_waitqueue_head(&socket_client->queue_wait); | |
73 | ||
74 | file->private_data = socket_client; | |
75 | ||
76 | inc_module_count(); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static int bat_socket_release(struct inode *inode, struct file *file) | |
81 | { | |
82 | struct socket_client *socket_client = file->private_data; | |
83 | struct socket_packet *socket_packet; | |
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, | |
91 | struct socket_packet, list); | |
92 | ||
93 | list_del(list_pos); | |
94 | kfree(socket_packet); | |
95 | } | |
96 | ||
97 | socket_client_hash[socket_client->index] = NULL; | |
98 | spin_unlock_bh(&socket_client->lock); | |
99 | ||
100 | kfree(socket_client); | |
101 | dec_module_count(); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | static ssize_t bat_socket_read(struct file *file, char __user *buf, | |
107 | size_t count, loff_t *ppos) | |
108 | { | |
109 | struct socket_client *socket_client = file->private_data; | |
110 | struct socket_packet *socket_packet; | |
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 | ||
117 | if ((!buf) || (count < sizeof(struct icmp_packet))) | |
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, | |
132 | struct socket_packet, list); | |
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 | ||
149 | static ssize_t bat_socket_write(struct file *file, const char __user *buff, | |
150 | size_t len, loff_t *off) | |
151 | { | |
152 | struct socket_client *socket_client = file->private_data; | |
153 | struct bat_priv *bat_priv = socket_client->bat_priv; | |
32ae9b22 | 154 | struct hard_iface *primary_if = NULL; |
c6c8fea2 SE |
155 | struct sk_buff *skb; |
156 | struct icmp_packet_rr *icmp_packet; | |
157 | ||
44524fcd ML |
158 | struct orig_node *orig_node = NULL; |
159 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 | 160 | size_t packet_len = sizeof(struct icmp_packet); |
c6c8fea2 SE |
161 | |
162 | if (len < sizeof(struct icmp_packet)) { | |
163 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 164 | "Error - can't send packet from char device: invalid packet size\n"); |
c6c8fea2 SE |
165 | return -EINVAL; |
166 | } | |
167 | ||
32ae9b22 ML |
168 | primary_if = primary_if_get_selected(bat_priv); |
169 | ||
170 | if (!primary_if) { | |
171 | len = -EFAULT; | |
172 | goto out; | |
173 | } | |
c6c8fea2 SE |
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)); | |
32ae9b22 ML |
179 | if (!skb) { |
180 | len = -ENOMEM; | |
181 | goto out; | |
182 | } | |
c6c8fea2 SE |
183 | |
184 | skb_reserve(skb, sizeof(struct ethhdr)); | |
185 | icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len); | |
186 | ||
d18eb453 | 187 | if (copy_from_user(icmp_packet, buff, packet_len)) { |
c6c8fea2 SE |
188 | len = -EFAULT; |
189 | goto free_skb; | |
190 | } | |
191 | ||
76543d14 | 192 | if (icmp_packet->header.packet_type != BAT_ICMP) { |
c6c8fea2 | 193 | bat_dbg(DBG_BATMAN, bat_priv, |
86ceb360 | 194 | "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n"); |
c6c8fea2 SE |
195 | len = -EINVAL; |
196 | goto free_skb; | |
197 | } | |
198 | ||
199 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
200 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 201 | "Error - can't send packet from char device: got bogus message type (expected: ECHO_REQUEST)\n"); |
c6c8fea2 SE |
202 | len = -EINVAL; |
203 | goto free_skb; | |
204 | } | |
205 | ||
206 | icmp_packet->uid = socket_client->index; | |
207 | ||
76543d14 | 208 | if (icmp_packet->header.version != COMPAT_VERSION) { |
c6c8fea2 | 209 | icmp_packet->msg_type = PARAMETER_PROBLEM; |
76543d14 | 210 | icmp_packet->header.version = COMPAT_VERSION; |
c6c8fea2 SE |
211 | bat_socket_add_packet(socket_client, icmp_packet, packet_len); |
212 | goto free_skb; | |
213 | } | |
214 | ||
215 | if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) | |
216 | goto dst_unreach; | |
217 | ||
7aadf889 | 218 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
c6c8fea2 | 219 | if (!orig_node) |
e1a5382f | 220 | goto dst_unreach; |
44524fcd | 221 | |
e1a5382f | 222 | neigh_node = orig_node_get_router(orig_node); |
44524fcd | 223 | if (!neigh_node) |
e1a5382f | 224 | goto dst_unreach; |
c6c8fea2 | 225 | |
d0072609 | 226 | if (!neigh_node->if_incoming) |
c6c8fea2 SE |
227 | goto dst_unreach; |
228 | ||
d0072609 | 229 | if (neigh_node->if_incoming->if_status != IF_ACTIVE) |
c6c8fea2 SE |
230 | goto dst_unreach; |
231 | ||
232 | memcpy(icmp_packet->orig, | |
32ae9b22 | 233 | primary_if->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 SE |
234 | |
235 | if (packet_len == sizeof(struct icmp_packet_rr)) | |
44524fcd | 236 | memcpy(icmp_packet->rr, |
d0072609 | 237 | neigh_node->if_incoming->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 238 | |
d0072609 | 239 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
c6c8fea2 SE |
240 | goto out; |
241 | ||
c6c8fea2 SE |
242 | dst_unreach: |
243 | icmp_packet->msg_type = DESTINATION_UNREACHABLE; | |
244 | bat_socket_add_packet(socket_client, icmp_packet, packet_len); | |
245 | free_skb: | |
246 | kfree_skb(skb); | |
247 | out: | |
32ae9b22 ML |
248 | if (primary_if) |
249 | hardif_free_ref(primary_if); | |
44524fcd ML |
250 | if (neigh_node) |
251 | neigh_node_free_ref(neigh_node); | |
252 | if (orig_node) | |
7b36e8ee | 253 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
254 | return len; |
255 | } | |
256 | ||
257 | static unsigned int bat_socket_poll(struct file *file, poll_table *wait) | |
258 | { | |
259 | struct socket_client *socket_client = file->private_data; | |
260 | ||
261 | poll_wait(file, &socket_client->queue_wait, wait); | |
262 | ||
263 | if (socket_client->queue_len > 0) | |
264 | return POLLIN | POLLRDNORM; | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static const struct file_operations fops = { | |
270 | .owner = THIS_MODULE, | |
271 | .open = bat_socket_open, | |
272 | .release = bat_socket_release, | |
273 | .read = bat_socket_read, | |
274 | .write = bat_socket_write, | |
275 | .poll = bat_socket_poll, | |
276 | .llseek = no_llseek, | |
277 | }; | |
278 | ||
279 | int bat_socket_setup(struct bat_priv *bat_priv) | |
280 | { | |
281 | struct dentry *d; | |
282 | ||
283 | if (!bat_priv->debug_dir) | |
284 | goto err; | |
285 | ||
286 | d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR, | |
287 | bat_priv->debug_dir, bat_priv, &fops); | |
288 | if (d) | |
289 | goto err; | |
290 | ||
291 | return 0; | |
292 | ||
293 | err: | |
294 | return 1; | |
295 | } | |
296 | ||
297 | static void bat_socket_add_packet(struct socket_client *socket_client, | |
298 | struct icmp_packet_rr *icmp_packet, | |
299 | size_t icmp_len) | |
300 | { | |
301 | struct socket_packet *socket_packet; | |
302 | ||
704509b8 | 303 | socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC); |
c6c8fea2 SE |
304 | |
305 | if (!socket_packet) | |
306 | return; | |
307 | ||
308 | INIT_LIST_HEAD(&socket_packet->list); | |
309 | memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len); | |
310 | socket_packet->icmp_len = icmp_len; | |
311 | ||
312 | spin_lock_bh(&socket_client->lock); | |
313 | ||
314 | /* while waiting for the lock the socket_client could have been | |
315 | * deleted */ | |
316 | if (!socket_client_hash[icmp_packet->uid]) { | |
317 | spin_unlock_bh(&socket_client->lock); | |
318 | kfree(socket_packet); | |
319 | return; | |
320 | } | |
321 | ||
322 | list_add_tail(&socket_packet->list, &socket_client->queue_list); | |
323 | socket_client->queue_len++; | |
324 | ||
325 | if (socket_client->queue_len > 100) { | |
326 | socket_packet = list_first_entry(&socket_client->queue_list, | |
327 | struct socket_packet, list); | |
328 | ||
329 | list_del(&socket_packet->list); | |
330 | kfree(socket_packet); | |
331 | socket_client->queue_len--; | |
332 | } | |
333 | ||
334 | spin_unlock_bh(&socket_client->lock); | |
335 | ||
336 | wake_up(&socket_client->queue_wait); | |
337 | } | |
338 | ||
339 | void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet, | |
340 | size_t icmp_len) | |
341 | { | |
342 | struct socket_client *hash = socket_client_hash[icmp_packet->uid]; | |
343 | ||
344 | if (hash) | |
345 | bat_socket_add_packet(hash, icmp_packet, icmp_len); | |
346 | } |