blob: 2523436907e68dff2a4aae9c045acfe91e9665ca [file] [log] [blame]
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +02001/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00002 *
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
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000018 */
19
20#include "main.h"
21#include <linux/debugfs.h>
22#include <linux/slab.h>
23#include "icmp_socket.h"
24#include "send.h"
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000025#include "hash.h"
26#include "originator.h"
27#include "hard-interface.h"
28
29static struct socket_client *socket_client_hash[256];
30
31static void bat_socket_add_packet(struct socket_client *socket_client,
32 struct icmp_packet_rr *icmp_packet,
33 size_t icmp_len);
34
Sven Eckelmann9039dc72012-05-12 02:09:33 +020035void batadv_socket_init(void)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000036{
37 memset(socket_client_hash, 0, sizeof(socket_client_hash));
38}
39
40static 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
Sven Eckelmann704509b2011-05-14 23:14:54 +020047 socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000048
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)) {
Sven Eckelmann86ceb362012-03-07 09:07:45 +010060 pr_err("Error - can't add another packet client: maximum number of clients reached\n");
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000061 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
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020074 batadv_inc_module_count();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000075 return 0;
76}
77
78static 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);
Sven Eckelmann3193e8f2012-05-12 02:09:42 +020099 batadv_dec_module_count();
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000100
101 return 0;
102}
103
104static 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
Sven Eckelmannb5a1eee2011-12-10 15:28:36 +0100136 packet_len = min(count, socket_packet->icmp_len);
137 error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000138
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000139 kfree(socket_packet);
140
141 if (error)
142 return -EFAULT;
143
144 return packet_len;
145}
146
147static 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;
Marek Lindner32ae9b22011-04-20 15:40:58 +0200152 struct hard_iface *primary_if = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000153 struct sk_buff *skb;
154 struct icmp_packet_rr *icmp_packet;
155
Marek Lindner44524fc2011-02-10 14:33:53 +0000156 struct orig_node *orig_node = NULL;
157 struct neigh_node *neigh_node = NULL;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000158 size_t packet_len = sizeof(struct icmp_packet);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000159
160 if (len < sizeof(struct icmp_packet)) {
161 bat_dbg(DBG_BATMAN, bat_priv,
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100162 "Error - can't send packet from char device: invalid packet size\n");
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000163 return -EINVAL;
164 }
165
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200166 primary_if = batadv_primary_if_get_selected(bat_priv);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200167
168 if (!primary_if) {
169 len = -EFAULT;
170 goto out;
171 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000172
173 if (len >= sizeof(struct icmp_packet_rr))
174 packet_len = sizeof(struct icmp_packet_rr);
175
Antonio Quartulli0d125072012-02-18 11:27:34 +0100176 skb = dev_alloc_skb(packet_len + ETH_HLEN);
Marek Lindner32ae9b22011-04-20 15:40:58 +0200177 if (!skb) {
178 len = -ENOMEM;
179 goto out;
180 }
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000181
Antonio Quartulli0d125072012-02-18 11:27:34 +0100182 skb_reserve(skb, ETH_HLEN);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000183 icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
184
Sven Eckelmannd18eb452011-12-10 15:28:35 +0100185 if (copy_from_user(icmp_packet, buff, packet_len)) {
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000186 len = -EFAULT;
187 goto free_skb;
188 }
189
Sven Eckelmann76543d12011-11-20 15:47:38 +0100190 if (icmp_packet->header.packet_type != BAT_ICMP) {
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000191 bat_dbg(DBG_BATMAN, bat_priv,
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100192 "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n");
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000193 len = -EINVAL;
194 goto free_skb;
195 }
196
197 if (icmp_packet->msg_type != ECHO_REQUEST) {
198 bat_dbg(DBG_BATMAN, bat_priv,
Sven Eckelmann86ceb362012-03-07 09:07:45 +0100199 "Error - can't send packet from char device: got bogus message type (expected: ECHO_REQUEST)\n");
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000200 len = -EINVAL;
201 goto free_skb;
202 }
203
204 icmp_packet->uid = socket_client->index;
205
Sven Eckelmann76543d12011-11-20 15:47:38 +0100206 if (icmp_packet->header.version != COMPAT_VERSION) {
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000207 icmp_packet->msg_type = PARAMETER_PROBLEM;
Sven Eckelmann76543d12011-11-20 15:47:38 +0100208 icmp_packet->header.version = COMPAT_VERSION;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000209 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
Marek Lindner7aadf882011-02-18 12:28:09 +0000216 orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000217 if (!orig_node)
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000218 goto dst_unreach;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000219
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200220 neigh_node = batadv_orig_node_get_router(orig_node);
Marek Lindner44524fc2011-02-10 14:33:53 +0000221 if (!neigh_node)
Linus Lüssinge1a5382f2011-03-14 22:43:37 +0000222 goto dst_unreach;
Marek Lindner44524fc2011-02-10 14:33:53 +0000223
Marek Lindnerd0072602011-01-19 20:01:44 +0000224 if (!neigh_node->if_incoming)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000225 goto dst_unreach;
226
Marek Lindnerd0072602011-01-19 20:01:44 +0000227 if (neigh_node->if_incoming->if_status != IF_ACTIVE)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000228 goto dst_unreach;
229
230 memcpy(icmp_packet->orig,
Marek Lindner32ae9b22011-04-20 15:40:58 +0200231 primary_if->net_dev->dev_addr, ETH_ALEN);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000232
233 if (packet_len == sizeof(struct icmp_packet_rr))
Marek Lindner44524fc2011-02-10 14:33:53 +0000234 memcpy(icmp_packet->rr,
Marek Lindnerd0072602011-01-19 20:01:44 +0000235 neigh_node->if_incoming->net_dev->dev_addr, ETH_ALEN);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000236
Sven Eckelmann9455e342012-05-12 02:09:37 +0200237 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000238 goto out;
239
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000240dst_unreach:
241 icmp_packet->msg_type = DESTINATION_UNREACHABLE;
242 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
243free_skb:
244 kfree_skb(skb);
245out:
Marek Lindner32ae9b22011-04-20 15:40:58 +0200246 if (primary_if)
Sven Eckelmanne5d89252012-05-12 13:48:54 +0200247 batadv_hardif_free_ref(primary_if);
Marek Lindner44524fc2011-02-10 14:33:53 +0000248 if (neigh_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200249 batadv_neigh_node_free_ref(neigh_node);
Marek Lindner44524fc2011-02-10 14:33:53 +0000250 if (orig_node)
Sven Eckelmann7d211ef2012-05-12 02:09:34 +0200251 batadv_orig_node_free_ref(orig_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000252 return len;
253}
254
255static 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
267static 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
Sven Eckelmann9039dc72012-05-12 02:09:33 +0200277int batadv_socket_setup(struct bat_priv *bat_priv)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000278{
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);
Sven Eckelmann5346c352012-05-05 13:27:28 +0200286 if (!d)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000287 goto err;
288
289 return 0;
290
291err:
Sven Eckelmann5346c352012-05-05 13:27:28 +0200292 return -ENOMEM;
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000293}
294
295static 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
Sven Eckelmann704509b2011-05-14 23:14:54 +0200301 socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000302
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
Sven Eckelmann9cfc7bd2012-05-12 02:09:43 +0200313 * deleted
314 */
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000315 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
Sven Eckelmann9039dc72012-05-12 02:09:33 +0200338void batadv_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
339 size_t icmp_len)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000340{
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}