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TOMOYO Linux Cross Reference
Linux/net/batman-adv/icmp_socket.c

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  1 /*
  2  * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
  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"
 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 
 49         socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
 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;
156         struct sk_buff *skb;
157         struct icmp_packet_rr *icmp_packet;
158 
159         struct orig_node *orig_node = NULL;
160         struct neigh_node *neigh_node = NULL;
161         size_t packet_len = sizeof(struct icmp_packet);
162 
163         if (len < sizeof(struct icmp_packet)) {
164                 bat_dbg(DBG_BATMAN, bat_priv,
165                         "Error - can't send packet from char device: "
166                         "invalid packet size\n");
167                 return -EINVAL;
168         }
169 
170         if (!bat_priv->primary_if)
171                 return -EFAULT;
172 
173         if (len >= sizeof(struct icmp_packet_rr))
174                 packet_len = sizeof(struct icmp_packet_rr);
175 
176         skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
177         if (!skb)
178                 return -ENOMEM;
179 
180         skb_reserve(skb, sizeof(struct ethhdr));
181         icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
182 
183         if (!access_ok(VERIFY_READ, buff, packet_len)) {
184                 len = -EFAULT;
185                 goto free_skb;
186         }
187 
188         if (__copy_from_user(icmp_packet, buff, packet_len)) {
189                 len = -EFAULT;
190                 goto free_skb;
191         }
192 
193         if (icmp_packet->packet_type != BAT_ICMP) {
194                 bat_dbg(DBG_BATMAN, bat_priv,
195                         "Error - can't send packet from char device: "
196                         "got bogus packet type (expected: BAT_ICMP)\n");
197                 len = -EINVAL;
198                 goto free_skb;
199         }
200 
201         if (icmp_packet->msg_type != ECHO_REQUEST) {
202                 bat_dbg(DBG_BATMAN, bat_priv,
203                         "Error - can't send packet from char device: "
204                         "got bogus message type (expected: ECHO_REQUEST)\n");
205                 len = -EINVAL;
206                 goto free_skb;
207         }
208 
209         icmp_packet->uid = socket_client->index;
210 
211         if (icmp_packet->version != COMPAT_VERSION) {
212                 icmp_packet->msg_type = PARAMETER_PROBLEM;
213                 icmp_packet->ttl = COMPAT_VERSION;
214                 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
215                 goto free_skb;
216         }
217 
218         if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
219                 goto dst_unreach;
220 
221         rcu_read_lock();
222         orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
223 
224         if (!orig_node)
225                 goto unlock;
226 
227         neigh_node = orig_node->router;
228 
229         if (!neigh_node)
230                 goto unlock;
231 
232         if (!atomic_inc_not_zero(&neigh_node->refcount)) {
233                 neigh_node = NULL;
234                 goto unlock;
235         }
236 
237         rcu_read_unlock();
238 
239         if (!neigh_node->if_incoming)
240                 goto dst_unreach;
241 
242         if (neigh_node->if_incoming->if_status != IF_ACTIVE)
243                 goto dst_unreach;
244 
245         memcpy(icmp_packet->orig,
246                bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
247 
248         if (packet_len == sizeof(struct icmp_packet_rr))
249                 memcpy(icmp_packet->rr,
250                        neigh_node->if_incoming->net_dev->dev_addr, ETH_ALEN);
251 
252         send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
253         goto out;
254 
255 unlock:
256         rcu_read_unlock();
257 dst_unreach:
258         icmp_packet->msg_type = DESTINATION_UNREACHABLE;
259         bat_socket_add_packet(socket_client, icmp_packet, packet_len);
260 free_skb:
261         kfree_skb(skb);
262 out:
263         if (neigh_node)
264                 neigh_node_free_ref(neigh_node);
265         if (orig_node)
266                 orig_node_free_ref(orig_node);
267         return len;
268 }
269 
270 static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
271 {
272         struct socket_client *socket_client = file->private_data;
273 
274         poll_wait(file, &socket_client->queue_wait, wait);
275 
276         if (socket_client->queue_len > 0)
277                 return POLLIN | POLLRDNORM;
278 
279         return 0;
280 }
281 
282 static const struct file_operations fops = {
283         .owner = THIS_MODULE,
284         .open = bat_socket_open,
285         .release = bat_socket_release,
286         .read = bat_socket_read,
287         .write = bat_socket_write,
288         .poll = bat_socket_poll,
289         .llseek = no_llseek,
290 };
291 
292 int bat_socket_setup(struct bat_priv *bat_priv)
293 {
294         struct dentry *d;
295 
296         if (!bat_priv->debug_dir)
297                 goto err;
298 
299         d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
300                                 bat_priv->debug_dir, bat_priv, &fops);
301         if (d)
302                 goto err;
303 
304         return 0;
305 
306 err:
307         return 1;
308 }
309 
310 static void bat_socket_add_packet(struct socket_client *socket_client,
311                                   struct icmp_packet_rr *icmp_packet,
312                                   size_t icmp_len)
313 {
314         struct socket_packet *socket_packet;
315 
316         socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
317 
318         if (!socket_packet)
319                 return;
320 
321         INIT_LIST_HEAD(&socket_packet->list);
322         memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
323         socket_packet->icmp_len = icmp_len;
324 
325         spin_lock_bh(&socket_client->lock);
326 
327         /* while waiting for the lock the socket_client could have been
328          * deleted */
329         if (!socket_client_hash[icmp_packet->uid]) {
330                 spin_unlock_bh(&socket_client->lock);
331                 kfree(socket_packet);
332                 return;
333         }
334 
335         list_add_tail(&socket_packet->list, &socket_client->queue_list);
336         socket_client->queue_len++;
337 
338         if (socket_client->queue_len > 100) {
339                 socket_packet = list_first_entry(&socket_client->queue_list,
340                                                  struct socket_packet, list);
341 
342                 list_del(&socket_packet->list);
343                 kfree(socket_packet);
344                 socket_client->queue_len--;
345         }
346 
347         spin_unlock_bh(&socket_client->lock);
348 
349         wake_up(&socket_client->queue_wait);
350 }
351 
352 void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
353                                size_t icmp_len)
354 {
355         struct socket_client *hash = socket_client_hash[icmp_packet->uid];
356 
357         if (hash)
358                 bat_socket_add_packet(hash, icmp_packet, icmp_len);
359 }
360 

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