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9cfc7bd6 | 1 | /* Copyright (C) 2007-2012 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 | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
21 | #include <linux/debugfs.h> | |
22 | #include <linux/slab.h> | |
23 | #include "icmp_socket.h" | |
24 | #include "send.h" | |
c6c8fea2 SE |
25 | #include "hash.h" |
26 | #include "originator.h" | |
27 | #include "hard-interface.h" | |
28 | ||
29 | static struct socket_client *socket_client_hash[256]; | |
30 | ||
31 | static void bat_socket_add_packet(struct socket_client *socket_client, | |
32 | struct icmp_packet_rr *icmp_packet, | |
33 | size_t icmp_len); | |
34 | ||
9039dc7e | 35 | void batadv_socket_init(void) |
c6c8fea2 SE |
36 | { |
37 | memset(socket_client_hash, 0, sizeof(socket_client_hash)); | |
38 | } | |
39 | ||
40 | static int bat_socket_open(struct inode *inode, struct file *file) | |
41 | { | |
42 | unsigned int i; | |
43 | struct socket_client *socket_client; | |
44 | ||
45 | nonseekable_open(inode, file); | |
46 | ||
704509b8 | 47 | socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL); |
c6c8fea2 SE |
48 | |
49 | if (!socket_client) | |
50 | return -ENOMEM; | |
51 | ||
52 | for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) { | |
53 | if (!socket_client_hash[i]) { | |
54 | socket_client_hash[i] = socket_client; | |
55 | break; | |
56 | } | |
57 | } | |
58 | ||
59 | if (i == ARRAY_SIZE(socket_client_hash)) { | |
86ceb360 | 60 | pr_err("Error - can't add another packet client: maximum number of clients reached\n"); |
c6c8fea2 SE |
61 | kfree(socket_client); |
62 | return -EXFULL; | |
63 | } | |
64 | ||
65 | INIT_LIST_HEAD(&socket_client->queue_list); | |
66 | socket_client->queue_len = 0; | |
67 | socket_client->index = i; | |
68 | socket_client->bat_priv = inode->i_private; | |
69 | spin_lock_init(&socket_client->lock); | |
70 | init_waitqueue_head(&socket_client->queue_wait); | |
71 | ||
72 | file->private_data = socket_client; | |
73 | ||
3193e8fd | 74 | batadv_inc_module_count(); |
c6c8fea2 SE |
75 | return 0; |
76 | } | |
77 | ||
78 | static int bat_socket_release(struct inode *inode, struct file *file) | |
79 | { | |
80 | struct socket_client *socket_client = file->private_data; | |
81 | struct socket_packet *socket_packet; | |
82 | struct list_head *list_pos, *list_pos_tmp; | |
83 | ||
84 | spin_lock_bh(&socket_client->lock); | |
85 | ||
86 | /* for all packets in the queue ... */ | |
87 | list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) { | |
88 | socket_packet = list_entry(list_pos, | |
89 | struct socket_packet, list); | |
90 | ||
91 | list_del(list_pos); | |
92 | kfree(socket_packet); | |
93 | } | |
94 | ||
95 | socket_client_hash[socket_client->index] = NULL; | |
96 | spin_unlock_bh(&socket_client->lock); | |
97 | ||
98 | kfree(socket_client); | |
3193e8fd | 99 | batadv_dec_module_count(); |
c6c8fea2 SE |
100 | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static ssize_t bat_socket_read(struct file *file, char __user *buf, | |
105 | size_t count, loff_t *ppos) | |
106 | { | |
107 | struct socket_client *socket_client = file->private_data; | |
108 | struct socket_packet *socket_packet; | |
109 | size_t packet_len; | |
110 | int error; | |
111 | ||
112 | if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0)) | |
113 | return -EAGAIN; | |
114 | ||
115 | if ((!buf) || (count < sizeof(struct icmp_packet))) | |
116 | return -EINVAL; | |
117 | ||
118 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
119 | return -EFAULT; | |
120 | ||
121 | error = wait_event_interruptible(socket_client->queue_wait, | |
122 | socket_client->queue_len); | |
123 | ||
124 | if (error) | |
125 | return error; | |
126 | ||
127 | spin_lock_bh(&socket_client->lock); | |
128 | ||
129 | socket_packet = list_first_entry(&socket_client->queue_list, | |
130 | struct socket_packet, list); | |
131 | list_del(&socket_packet->list); | |
132 | socket_client->queue_len--; | |
133 | ||
134 | spin_unlock_bh(&socket_client->lock); | |
135 | ||
b5a1eeef SE |
136 | packet_len = min(count, socket_packet->icmp_len); |
137 | error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len); | |
c6c8fea2 | 138 | |
c6c8fea2 SE |
139 | kfree(socket_packet); |
140 | ||
141 | if (error) | |
142 | return -EFAULT; | |
143 | ||
144 | return packet_len; | |
145 | } | |
146 | ||
147 | static ssize_t bat_socket_write(struct file *file, const char __user *buff, | |
148 | size_t len, loff_t *off) | |
149 | { | |
150 | struct socket_client *socket_client = file->private_data; | |
151 | struct bat_priv *bat_priv = socket_client->bat_priv; | |
32ae9b22 | 152 | struct hard_iface *primary_if = NULL; |
c6c8fea2 SE |
153 | struct sk_buff *skb; |
154 | struct icmp_packet_rr *icmp_packet; | |
155 | ||
44524fcd ML |
156 | struct orig_node *orig_node = NULL; |
157 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 | 158 | size_t packet_len = sizeof(struct icmp_packet); |
c6c8fea2 SE |
159 | |
160 | if (len < sizeof(struct icmp_packet)) { | |
161 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 162 | "Error - can't send packet from char device: invalid packet size\n"); |
c6c8fea2 SE |
163 | return -EINVAL; |
164 | } | |
165 | ||
e5d89254 | 166 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
167 | |
168 | if (!primary_if) { | |
169 | len = -EFAULT; | |
170 | goto out; | |
171 | } | |
c6c8fea2 SE |
172 | |
173 | if (len >= sizeof(struct icmp_packet_rr)) | |
174 | packet_len = sizeof(struct icmp_packet_rr); | |
175 | ||
0d125074 | 176 | skb = dev_alloc_skb(packet_len + ETH_HLEN); |
32ae9b22 ML |
177 | if (!skb) { |
178 | len = -ENOMEM; | |
179 | goto out; | |
180 | } | |
c6c8fea2 | 181 | |
0d125074 | 182 | skb_reserve(skb, ETH_HLEN); |
c6c8fea2 SE |
183 | icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len); |
184 | ||
d18eb453 | 185 | if (copy_from_user(icmp_packet, buff, packet_len)) { |
c6c8fea2 SE |
186 | len = -EFAULT; |
187 | goto free_skb; | |
188 | } | |
189 | ||
76543d14 | 190 | if (icmp_packet->header.packet_type != BAT_ICMP) { |
c6c8fea2 | 191 | bat_dbg(DBG_BATMAN, bat_priv, |
86ceb360 | 192 | "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n"); |
c6c8fea2 SE |
193 | len = -EINVAL; |
194 | goto free_skb; | |
195 | } | |
196 | ||
197 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
198 | bat_dbg(DBG_BATMAN, bat_priv, | |
86ceb360 | 199 | "Error - can't send packet from char device: got bogus message type (expected: ECHO_REQUEST)\n"); |
c6c8fea2 SE |
200 | len = -EINVAL; |
201 | goto free_skb; | |
202 | } | |
203 | ||
204 | icmp_packet->uid = socket_client->index; | |
205 | ||
76543d14 | 206 | if (icmp_packet->header.version != COMPAT_VERSION) { |
c6c8fea2 | 207 | icmp_packet->msg_type = PARAMETER_PROBLEM; |
76543d14 | 208 | icmp_packet->header.version = COMPAT_VERSION; |
c6c8fea2 SE |
209 | bat_socket_add_packet(socket_client, icmp_packet, packet_len); |
210 | goto free_skb; | |
211 | } | |
212 | ||
213 | if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE) | |
214 | goto dst_unreach; | |
215 | ||
7aadf889 | 216 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
c6c8fea2 | 217 | if (!orig_node) |
e1a5382f | 218 | goto dst_unreach; |
44524fcd | 219 | |
7d211efc | 220 | neigh_node = batadv_orig_node_get_router(orig_node); |
44524fcd | 221 | if (!neigh_node) |
e1a5382f | 222 | goto dst_unreach; |
c6c8fea2 | 223 | |
d0072609 | 224 | if (!neigh_node->if_incoming) |
c6c8fea2 SE |
225 | goto dst_unreach; |
226 | ||
d0072609 | 227 | if (neigh_node->if_incoming->if_status != IF_ACTIVE) |
c6c8fea2 SE |
228 | goto dst_unreach; |
229 | ||
230 | memcpy(icmp_packet->orig, | |
32ae9b22 | 231 | primary_if->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 SE |
232 | |
233 | if (packet_len == sizeof(struct icmp_packet_rr)) | |
44524fcd | 234 | memcpy(icmp_packet->rr, |
d0072609 | 235 | neigh_node->if_incoming->net_dev->dev_addr, ETH_ALEN); |
c6c8fea2 | 236 | |
9455e34c | 237 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
c6c8fea2 SE |
238 | goto out; |
239 | ||
c6c8fea2 SE |
240 | dst_unreach: |
241 | icmp_packet->msg_type = DESTINATION_UNREACHABLE; | |
242 | bat_socket_add_packet(socket_client, icmp_packet, packet_len); | |
243 | free_skb: | |
244 | kfree_skb(skb); | |
245 | out: | |
32ae9b22 | 246 | if (primary_if) |
e5d89254 | 247 | batadv_hardif_free_ref(primary_if); |
44524fcd | 248 | if (neigh_node) |
7d211efc | 249 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 250 | if (orig_node) |
7d211efc | 251 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
252 | return len; |
253 | } | |
254 | ||
255 | static unsigned int bat_socket_poll(struct file *file, poll_table *wait) | |
256 | { | |
257 | struct socket_client *socket_client = file->private_data; | |
258 | ||
259 | poll_wait(file, &socket_client->queue_wait, wait); | |
260 | ||
261 | if (socket_client->queue_len > 0) | |
262 | return POLLIN | POLLRDNORM; | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static const struct file_operations fops = { | |
268 | .owner = THIS_MODULE, | |
269 | .open = bat_socket_open, | |
270 | .release = bat_socket_release, | |
271 | .read = bat_socket_read, | |
272 | .write = bat_socket_write, | |
273 | .poll = bat_socket_poll, | |
274 | .llseek = no_llseek, | |
275 | }; | |
276 | ||
9039dc7e | 277 | int batadv_socket_setup(struct bat_priv *bat_priv) |
c6c8fea2 SE |
278 | { |
279 | struct dentry *d; | |
280 | ||
281 | if (!bat_priv->debug_dir) | |
282 | goto err; | |
283 | ||
284 | d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR, | |
285 | bat_priv->debug_dir, bat_priv, &fops); | |
5346c35e | 286 | if (!d) |
c6c8fea2 SE |
287 | goto err; |
288 | ||
289 | return 0; | |
290 | ||
291 | err: | |
5346c35e | 292 | return -ENOMEM; |
c6c8fea2 SE |
293 | } |
294 | ||
295 | static void bat_socket_add_packet(struct socket_client *socket_client, | |
296 | struct icmp_packet_rr *icmp_packet, | |
297 | size_t icmp_len) | |
298 | { | |
299 | struct socket_packet *socket_packet; | |
300 | ||
704509b8 | 301 | socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC); |
c6c8fea2 SE |
302 | |
303 | if (!socket_packet) | |
304 | return; | |
305 | ||
306 | INIT_LIST_HEAD(&socket_packet->list); | |
307 | memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len); | |
308 | socket_packet->icmp_len = icmp_len; | |
309 | ||
310 | spin_lock_bh(&socket_client->lock); | |
311 | ||
312 | /* while waiting for the lock the socket_client could have been | |
9cfc7bd6 SE |
313 | * deleted |
314 | */ | |
c6c8fea2 SE |
315 | if (!socket_client_hash[icmp_packet->uid]) { |
316 | spin_unlock_bh(&socket_client->lock); | |
317 | kfree(socket_packet); | |
318 | return; | |
319 | } | |
320 | ||
321 | list_add_tail(&socket_packet->list, &socket_client->queue_list); | |
322 | socket_client->queue_len++; | |
323 | ||
324 | if (socket_client->queue_len > 100) { | |
325 | socket_packet = list_first_entry(&socket_client->queue_list, | |
326 | struct socket_packet, list); | |
327 | ||
328 | list_del(&socket_packet->list); | |
329 | kfree(socket_packet); | |
330 | socket_client->queue_len--; | |
331 | } | |
332 | ||
333 | spin_unlock_bh(&socket_client->lock); | |
334 | ||
335 | wake_up(&socket_client->queue_wait); | |
336 | } | |
337 | ||
9039dc7e SE |
338 | void batadv_socket_receive_packet(struct icmp_packet_rr *icmp_packet, |
339 | size_t icmp_len) | |
c6c8fea2 SE |
340 | { |
341 | struct socket_client *hash = socket_client_hash[icmp_packet->uid]; | |
342 | ||
343 | if (hash) | |
344 | bat_socket_add_packet(hash, icmp_packet, icmp_len); | |
345 | } |