2 * Copyright (C) 2007-2010 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"
29 #include "hard-interface.h"
32 static struct socket_client
*socket_client_hash
[256];
34 static void bat_socket_add_packet(struct socket_client
*socket_client
,
35 struct icmp_packet_rr
*icmp_packet
,
38 void bat_socket_init(void)
40 memset(socket_client_hash
, 0, sizeof(socket_client_hash
));
43 static int bat_socket_open(struct inode
*inode
, struct file
*file
)
46 struct socket_client
*socket_client
;
48 socket_client
= kmalloc(sizeof(struct socket_client
), GFP_KERNEL
);
53 for (i
= 0; i
< ARRAY_SIZE(socket_client_hash
); i
++) {
54 if (!socket_client_hash
[i
]) {
55 socket_client_hash
[i
] = socket_client
;
60 if (i
== ARRAY_SIZE(socket_client_hash
)) {
61 pr_err("Error - can't add another packet client: "
62 "maximum number of clients reached\n");
67 INIT_LIST_HEAD(&socket_client
->queue_list
);
68 socket_client
->queue_len
= 0;
69 socket_client
->index
= i
;
70 spin_lock_init(&socket_client
->lock
);
71 init_waitqueue_head(&socket_client
->queue_wait
);
73 file
->private_data
= socket_client
;
79 static int bat_socket_release(struct inode
*inode
, struct file
*file
)
81 struct socket_client
*socket_client
= file
->private_data
;
82 struct socket_packet
*socket_packet
;
83 struct list_head
*list_pos
, *list_pos_tmp
;
86 spin_lock_irqsave(&socket_client
->lock
, flags
);
88 /* for all packets in the queue ... */
89 list_for_each_safe(list_pos
, list_pos_tmp
, &socket_client
->queue_list
) {
90 socket_packet
= list_entry(list_pos
,
91 struct socket_packet
, list
);
97 socket_client_hash
[socket_client
->index
] = NULL
;
98 spin_unlock_irqrestore(&socket_client
->lock
, flags
);
100 kfree(socket_client
);
106 static ssize_t
bat_socket_read(struct file
*file
, char __user
*buf
,
107 size_t count
, loff_t
*ppos
)
109 struct socket_client
*socket_client
= file
->private_data
;
110 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_irqsave(&socket_client
->lock
, flags
);
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_irqrestore(&socket_client
->lock
, flags
);
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 /* FIXME: each orig_node->batman_if will be attached to a softif */
155 struct bat_priv
*bat_priv
= netdev_priv(soft_device
);
156 struct socket_client
*socket_client
= file
->private_data
;
157 struct icmp_packet_rr icmp_packet
;
158 struct orig_node
*orig_node
;
159 struct batman_if
*batman_if
;
160 size_t packet_len
= sizeof(struct icmp_packet
);
161 uint8_t dstaddr
[ETH_ALEN
];
164 if (len
< sizeof(struct icmp_packet
)) {
165 bat_dbg(DBG_BATMAN
, bat_priv
,
166 "Error - can't send packet from char device: "
167 "invalid packet size\n");
171 if (len
>= sizeof(struct icmp_packet_rr
))
172 packet_len
= sizeof(struct icmp_packet_rr
);
174 if (!access_ok(VERIFY_READ
, buff
, packet_len
))
177 if (__copy_from_user(&icmp_packet
, buff
, packet_len
))
180 if (icmp_packet
.packet_type
!= BAT_ICMP
) {
181 bat_dbg(DBG_BATMAN
, bat_priv
,
182 "Error - can't send packet from char device: "
183 "got bogus packet type (expected: BAT_ICMP)\n");
187 if (icmp_packet
.msg_type
!= ECHO_REQUEST
) {
188 bat_dbg(DBG_BATMAN
, bat_priv
,
189 "Error - can't send packet from char device: "
190 "got bogus message type (expected: ECHO_REQUEST)\n");
194 icmp_packet
.uid
= socket_client
->index
;
196 if (icmp_packet
.version
!= COMPAT_VERSION
) {
197 icmp_packet
.msg_type
= PARAMETER_PROBLEM
;
198 icmp_packet
.ttl
= COMPAT_VERSION
;
199 bat_socket_add_packet(socket_client
, &icmp_packet
, packet_len
);
203 if (atomic_read(&module_state
) != MODULE_ACTIVE
)
206 spin_lock_irqsave(&orig_hash_lock
, flags
);
207 orig_node
= ((struct orig_node
*)hash_find(orig_hash
, icmp_packet
.dst
));
212 if (!orig_node
->router
)
215 batman_if
= orig_node
->router
->if_incoming
;
216 memcpy(dstaddr
, orig_node
->router
->addr
, ETH_ALEN
);
218 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
223 if (batman_if
->if_status
!= IF_ACTIVE
)
226 memcpy(icmp_packet
.orig
, batman_if
->net_dev
->dev_addr
, ETH_ALEN
);
228 if (packet_len
== sizeof(struct icmp_packet_rr
))
229 memcpy(icmp_packet
.rr
, batman_if
->net_dev
->dev_addr
, ETH_ALEN
);
231 send_raw_packet((unsigned char *)&icmp_packet
,
232 packet_len
, batman_if
, dstaddr
);
237 spin_unlock_irqrestore(&orig_hash_lock
, flags
);
239 icmp_packet
.msg_type
= DESTINATION_UNREACHABLE
;
240 bat_socket_add_packet(socket_client
, &icmp_packet
, packet_len
);
245 static unsigned int bat_socket_poll(struct file
*file
, poll_table
*wait
)
247 struct socket_client
*socket_client
= file
->private_data
;
249 poll_wait(file
, &socket_client
->queue_wait
, wait
);
251 if (socket_client
->queue_len
> 0)
252 return POLLIN
| POLLRDNORM
;
257 static const struct file_operations fops
= {
258 .owner
= THIS_MODULE
,
259 .open
= bat_socket_open
,
260 .release
= bat_socket_release
,
261 .read
= bat_socket_read
,
262 .write
= bat_socket_write
,
263 .poll
= bat_socket_poll
,
266 int bat_socket_setup(struct bat_priv
*bat_priv
)
270 if (!bat_priv
->debug_dir
)
273 d
= debugfs_create_file(ICMP_SOCKET
, S_IFREG
| S_IWUSR
| S_IRUSR
,
274 bat_priv
->debug_dir
, NULL
, &fops
);
284 static void bat_socket_add_packet(struct socket_client
*socket_client
,
285 struct icmp_packet_rr
*icmp_packet
,
288 struct socket_packet
*socket_packet
;
291 socket_packet
= kmalloc(sizeof(struct socket_packet
), GFP_ATOMIC
);
296 INIT_LIST_HEAD(&socket_packet
->list
);
297 memcpy(&socket_packet
->icmp_packet
, icmp_packet
, icmp_len
);
298 socket_packet
->icmp_len
= icmp_len
;
300 spin_lock_irqsave(&socket_client
->lock
, flags
);
302 /* while waiting for the lock the socket_client could have been
304 if (!socket_client_hash
[icmp_packet
->uid
]) {
305 spin_unlock_irqrestore(&socket_client
->lock
, flags
);
306 kfree(socket_packet
);
310 list_add_tail(&socket_packet
->list
, &socket_client
->queue_list
);
311 socket_client
->queue_len
++;
313 if (socket_client
->queue_len
> 100) {
314 socket_packet
= list_first_entry(&socket_client
->queue_list
,
315 struct socket_packet
, list
);
317 list_del(&socket_packet
->list
);
318 kfree(socket_packet
);
319 socket_client
->queue_len
--;
322 spin_unlock_irqrestore(&socket_client
->lock
, flags
);
324 wake_up(&socket_client
->queue_wait
);
327 void bat_socket_receive_packet(struct icmp_packet_rr
*icmp_packet
,
330 struct socket_client
*hash
= socket_client_hash
[icmp_packet
->uid
];
333 bat_socket_add_packet(hash
, icmp_packet
, icmp_len
);