2 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
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.
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.
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
23 #include <linux/debugfs.h>
24 #include <linux/slab.h>
25 #include "icmp_socket.h"
28 #include "originator.h"
29 #include "hard-interface.h"
31 static struct socket_client *socket_client_hash[256];
33 static void bat_socket_add_packet(struct socket_client *socket_client,
34 struct icmp_packet_rr *icmp_packet,
37 void bat_socket_init(void)
39 memset(socket_client_hash, 0, sizeof(socket_client_hash));
42 static int bat_socket_open(struct inode *inode, struct file *file)
45 struct socket_client *socket_client;
47 nonseekable_open(inode, file);
49 socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
54 for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
55 if (!socket_client_hash[i]) {
56 socket_client_hash[i] = socket_client;
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");
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);
75 file->private_data = socket_client;
81 static int bat_socket_release(struct inode *inode, struct file *file)
83 struct socket_client *socket_client = file->private_data;
84 struct socket_packet *socket_packet;
85 struct list_head *list_pos, *list_pos_tmp;
87 spin_lock_bh(&socket_client->lock);
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);
98 socket_client_hash[socket_client->index] = NULL;
99 spin_unlock_bh(&socket_client->lock);
101 kfree(socket_client);
107 static ssize_t bat_socket_read(struct file *file, char __user *buf,
108 size_t count, loff_t *ppos)
110 struct socket_client *socket_client = file->private_data;
111 struct socket_packet *socket_packet;
115 if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
118 if ((!buf) || (count < sizeof(struct icmp_packet)))
121 if (!access_ok(VERIFY_WRITE, buf, count))
124 error = wait_event_interruptible(socket_client->queue_wait,
125 socket_client->queue_len);
130 spin_lock_bh(&socket_client->lock);
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--;
137 spin_unlock_bh(&socket_client->lock);
139 error = __copy_to_user(buf, &socket_packet->icmp_packet,
140 socket_packet->icmp_len);
142 packet_len = socket_packet->icmp_len;
143 kfree(socket_packet);
151 static ssize_t bat_socket_write(struct file *file, const char __user *buff,
152 size_t len, loff_t *off)
154 struct socket_client *socket_client = file->private_data;
155 struct bat_priv *bat_priv = socket_client->bat_priv;
157 struct icmp_packet_rr *icmp_packet;
159 struct orig_node *orig_node = NULL;
160 struct neigh_node *neigh_node = NULL;
161 struct batman_if *batman_if;
162 size_t packet_len = sizeof(struct icmp_packet);
163 uint8_t dstaddr[ETH_ALEN];
165 if (len < sizeof(struct icmp_packet)) {
166 bat_dbg(DBG_BATMAN, bat_priv,
167 "Error - can't send packet from char device: "
168 "invalid packet size\n");
172 if (!bat_priv->primary_if)
175 if (len >= sizeof(struct icmp_packet_rr))
176 packet_len = sizeof(struct icmp_packet_rr);
178 skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
182 skb_reserve(skb, sizeof(struct ethhdr));
183 icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
185 if (!access_ok(VERIFY_READ, buff, packet_len)) {
190 if (__copy_from_user(icmp_packet, buff, packet_len)) {
195 if (icmp_packet->packet_type != BAT_ICMP) {
196 bat_dbg(DBG_BATMAN, bat_priv,
197 "Error - can't send packet from char device: "
198 "got bogus packet type (expected: BAT_ICMP)\n");
203 if (icmp_packet->msg_type != ECHO_REQUEST) {
204 bat_dbg(DBG_BATMAN, bat_priv,
205 "Error - can't send packet from char device: "
206 "got bogus message type (expected: ECHO_REQUEST)\n");
211 icmp_packet->uid = socket_client->index;
213 if (icmp_packet->version != COMPAT_VERSION) {
214 icmp_packet->msg_type = PARAMETER_PROBLEM;
215 icmp_packet->ttl = COMPAT_VERSION;
216 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
220 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
223 spin_lock_bh(&bat_priv->orig_hash_lock);
225 orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
226 compare_orig, choose_orig,
232 kref_get(&orig_node->refcount);
233 neigh_node = orig_node->router;
238 if (!atomic_inc_not_zero(&neigh_node->refcount)) {
245 batman_if = orig_node->router->if_incoming;
246 memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
247 spin_unlock_bh(&bat_priv->orig_hash_lock);
252 if (batman_if->if_status != IF_ACTIVE)
255 memcpy(icmp_packet->orig,
256 bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
258 if (packet_len == sizeof(struct icmp_packet_rr))
259 memcpy(icmp_packet->rr,
260 batman_if->net_dev->dev_addr, ETH_ALEN);
262 send_skb_packet(skb, batman_if, dstaddr);
267 spin_unlock_bh(&bat_priv->orig_hash_lock);
269 icmp_packet->msg_type = DESTINATION_UNREACHABLE;
270 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
275 neigh_node_free_ref(neigh_node);
277 kref_put(&orig_node->refcount, orig_node_free_ref);
281 static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
283 struct socket_client *socket_client = file->private_data;
285 poll_wait(file, &socket_client->queue_wait, wait);
287 if (socket_client->queue_len > 0)
288 return POLLIN | POLLRDNORM;
293 static const struct file_operations fops = {
294 .owner = THIS_MODULE,
295 .open = bat_socket_open,
296 .release = bat_socket_release,
297 .read = bat_socket_read,
298 .write = bat_socket_write,
299 .poll = bat_socket_poll,
303 int bat_socket_setup(struct bat_priv *bat_priv)
307 if (!bat_priv->debug_dir)
310 d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
311 bat_priv->debug_dir, bat_priv, &fops);
321 static void bat_socket_add_packet(struct socket_client *socket_client,
322 struct icmp_packet_rr *icmp_packet,
325 struct socket_packet *socket_packet;
327 socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
332 INIT_LIST_HEAD(&socket_packet->list);
333 memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
334 socket_packet->icmp_len = icmp_len;
336 spin_lock_bh(&socket_client->lock);
338 /* while waiting for the lock the socket_client could have been
340 if (!socket_client_hash[icmp_packet->uid]) {
341 spin_unlock_bh(&socket_client->lock);
342 kfree(socket_packet);
346 list_add_tail(&socket_packet->list, &socket_client->queue_list);
347 socket_client->queue_len++;
349 if (socket_client->queue_len > 100) {
350 socket_packet = list_first_entry(&socket_client->queue_list,
351 struct socket_packet, list);
353 list_del(&socket_packet->list);
354 kfree(socket_packet);
355 socket_client->queue_len--;
358 spin_unlock_bh(&socket_client->lock);
360 wake_up(&socket_client->queue_wait);
363 void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
366 struct socket_client *hash = socket_client_hash[icmp_packet->uid];
369 bat_socket_add_packet(hash, icmp_packet, icmp_len);