1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
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.
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.
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
21 #include <linux/debugfs.h>
22 #include <linux/slab.h>
23 #include "icmp_socket.h"
26 #include "originator.h"
27 #include "hard-interface.h"
29 static struct socket_client *socket_client_hash[256];
31 static void bat_socket_add_packet(struct socket_client *socket_client,
32 struct icmp_packet_rr *icmp_packet,
35 void batadv_socket_init(void)
37 memset(socket_client_hash, 0, sizeof(socket_client_hash));
40 static int bat_socket_open(struct inode *inode, struct file *file)
43 struct socket_client *socket_client;
45 nonseekable_open(inode, file);
47 socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
52 for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
53 if (!socket_client_hash[i]) {
54 socket_client_hash[i] = socket_client;
59 if (i == ARRAY_SIZE(socket_client_hash)) {
60 pr_err("Error - can't add another packet client: maximum number of clients reached\n");
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);
72 file->private_data = socket_client;
74 batadv_inc_module_count();
78 static int bat_socket_release(struct inode *inode, struct file *file)
80 struct socket_client *socket_client = file->private_data;
81 struct socket_packet *socket_packet;
82 struct list_head *list_pos, *list_pos_tmp;
84 spin_lock_bh(&socket_client->lock);
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);
95 socket_client_hash[socket_client->index] = NULL;
96 spin_unlock_bh(&socket_client->lock);
99 batadv_dec_module_count();
104 static ssize_t bat_socket_read(struct file *file, char __user *buf,
105 size_t count, loff_t *ppos)
107 struct socket_client *socket_client = file->private_data;
108 struct socket_packet *socket_packet;
112 if ((file->f_flags & O_NONBLOCK) && (socket_client->queue_len == 0))
115 if ((!buf) || (count < sizeof(struct icmp_packet)))
118 if (!access_ok(VERIFY_WRITE, buf, count))
121 error = wait_event_interruptible(socket_client->queue_wait,
122 socket_client->queue_len);
127 spin_lock_bh(&socket_client->lock);
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--;
134 spin_unlock_bh(&socket_client->lock);
136 packet_len = min(count, socket_packet->icmp_len);
137 error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);
139 kfree(socket_packet);
147 static ssize_t bat_socket_write(struct file *file, const char __user *buff,
148 size_t len, loff_t *off)
150 struct socket_client *socket_client = file->private_data;
151 struct bat_priv *bat_priv = socket_client->bat_priv;
152 struct hard_iface *primary_if = NULL;
154 struct icmp_packet_rr *icmp_packet;
156 struct orig_node *orig_node = NULL;
157 struct neigh_node *neigh_node = NULL;
158 size_t packet_len = sizeof(struct icmp_packet);
160 if (len < sizeof(struct icmp_packet)) {
161 bat_dbg(DBG_BATMAN, bat_priv,
162 "Error - can't send packet from char device: invalid packet size\n");
166 primary_if = primary_if_get_selected(bat_priv);
173 if (len >= sizeof(struct icmp_packet_rr))
174 packet_len = sizeof(struct icmp_packet_rr);
176 skb = dev_alloc_skb(packet_len + ETH_HLEN);
182 skb_reserve(skb, ETH_HLEN);
183 icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
185 if (copy_from_user(icmp_packet, buff, packet_len)) {
190 if (icmp_packet->header.packet_type != BAT_ICMP) {
191 bat_dbg(DBG_BATMAN, bat_priv,
192 "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n");
197 if (icmp_packet->msg_type != ECHO_REQUEST) {
198 bat_dbg(DBG_BATMAN, bat_priv,
199 "Error - can't send packet from char device: got bogus message type (expected: ECHO_REQUEST)\n");
204 icmp_packet->uid = socket_client->index;
206 if (icmp_packet->header.version != COMPAT_VERSION) {
207 icmp_packet->msg_type = PARAMETER_PROBLEM;
208 icmp_packet->header.version = COMPAT_VERSION;
209 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
213 if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
216 orig_node = orig_hash_find(bat_priv, icmp_packet->dst);
220 neigh_node = batadv_orig_node_get_router(orig_node);
224 if (!neigh_node->if_incoming)
227 if (neigh_node->if_incoming->if_status != IF_ACTIVE)
230 memcpy(icmp_packet->orig,
231 primary_if->net_dev->dev_addr, ETH_ALEN);
233 if (packet_len == sizeof(struct icmp_packet_rr))
234 memcpy(icmp_packet->rr,
235 neigh_node->if_incoming->net_dev->dev_addr, ETH_ALEN);
237 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
241 icmp_packet->msg_type = DESTINATION_UNREACHABLE;
242 bat_socket_add_packet(socket_client, icmp_packet, packet_len);
247 hardif_free_ref(primary_if);
249 batadv_neigh_node_free_ref(neigh_node);
251 batadv_orig_node_free_ref(orig_node);
255 static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
257 struct socket_client *socket_client = file->private_data;
259 poll_wait(file, &socket_client->queue_wait, wait);
261 if (socket_client->queue_len > 0)
262 return POLLIN | POLLRDNORM;
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,
277 int batadv_socket_setup(struct bat_priv *bat_priv)
281 if (!bat_priv->debug_dir)
284 d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
285 bat_priv->debug_dir, bat_priv, &fops);
295 static void bat_socket_add_packet(struct socket_client *socket_client,
296 struct icmp_packet_rr *icmp_packet,
299 struct socket_packet *socket_packet;
301 socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC);
306 INIT_LIST_HEAD(&socket_packet->list);
307 memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
308 socket_packet->icmp_len = icmp_len;
310 spin_lock_bh(&socket_client->lock);
312 /* while waiting for the lock the socket_client could have been
315 if (!socket_client_hash[icmp_packet->uid]) {
316 spin_unlock_bh(&socket_client->lock);
317 kfree(socket_packet);
321 list_add_tail(&socket_packet->list, &socket_client->queue_list);
322 socket_client->queue_len++;
324 if (socket_client->queue_len > 100) {
325 socket_packet = list_first_entry(&socket_client->queue_list,
326 struct socket_packet, list);
328 list_del(&socket_packet->list);
329 kfree(socket_packet);
330 socket_client->queue_len--;
333 spin_unlock_bh(&socket_client->lock);
335 wake_up(&socket_client->queue_wait);
338 void batadv_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
341 struct socket_client *hash = socket_client_hash[icmp_packet->uid];
344 bat_socket_add_packet(hash, icmp_packet, icmp_len);