blob: 7eb6559e03158d07eada6eccddf882ddaa2ec537 [file] [log] [blame]
/*
* Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
*
* Marek Lindner
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*
*/
#include <linux/device.h>
#include <linux/slab.h>
#include "main.h"
#include "device.h"
#include "send.h"
#include "types.h"
#include "hash.h"
#include "hard-interface.h"
static struct class *batman_class;
static int Major; /* Major number assigned to our device driver */
static const struct file_operations fops = {
.open = bat_device_open,
.release = bat_device_release,
.read = bat_device_read,
.write = bat_device_write,
.poll = bat_device_poll,
};
static struct device_client *device_client_hash[256];
void bat_device_init(void)
{
memset(device_client_hash, 0, sizeof(device_client_hash));
}
int bat_device_setup(void)
{
int tmp_major;
if (Major)
return 1;
/* register our device - kernel assigns a free major number */
tmp_major = register_chrdev(0, DRIVER_DEVICE, &fops);
if (tmp_major < 0) {
printk(KERN_ERR "batman-adv:"
"Registering the character device failed with %d\n",
tmp_major);
return 0;
}
batman_class = class_create(THIS_MODULE, "batman-adv");
if (IS_ERR(batman_class)) {
printk(KERN_ERR "batman-adv:"
"Could not register class 'batman-adv'\n");
return 0;
}
device_create(batman_class, NULL, MKDEV(tmp_major, 0), NULL,
"batman-adv");
Major = tmp_major;
return 1;
}
void bat_device_destroy(void)
{
if (!Major)
return;
device_destroy(batman_class, MKDEV(Major, 0));
class_destroy(batman_class);
/* Unregister the device */
unregister_chrdev(Major, DRIVER_DEVICE);
Major = 0;
}
int bat_device_open(struct inode *inode, struct file *file)
{
unsigned int i;
struct device_client *device_client;
device_client = kmalloc(sizeof(struct device_client), GFP_KERNEL);
if (!device_client)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(device_client_hash); i++) {
if (!device_client_hash[i]) {
device_client_hash[i] = device_client;
break;
}
}
if (i == ARRAY_SIZE(device_client_hash)) {
printk(KERN_ERR "batman-adv:"
"Error - can't add another packet client: "
"maximum number of clients reached\n");
kfree(device_client);
return -EXFULL;
}
INIT_LIST_HEAD(&device_client->queue_list);
device_client->queue_len = 0;
device_client->index = i;
spin_lock_init(&device_client->lock);
init_waitqueue_head(&device_client->queue_wait);
file->private_data = device_client;
inc_module_count();
return 0;
}
int bat_device_release(struct inode *inode, struct file *file)
{
struct device_client *device_client =
(struct device_client *)file->private_data;
struct device_packet *device_packet;
struct list_head *list_pos, *list_pos_tmp;
unsigned long flags;
spin_lock_irqsave(&device_client->lock, flags);
/* for all packets in the queue ... */
list_for_each_safe(list_pos, list_pos_tmp, &device_client->queue_list) {
device_packet = list_entry(list_pos,
struct device_packet, list);
list_del(list_pos);
kfree(device_packet);
}
device_client_hash[device_client->index] = NULL;
spin_unlock_irqrestore(&device_client->lock, flags);
kfree(device_client);
dec_module_count();
return 0;
}
ssize_t bat_device_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
struct device_client *device_client =
(struct device_client *)file->private_data;
struct device_packet *device_packet;
int error;
unsigned long flags;
if ((file->f_flags & O_NONBLOCK) && (device_client->queue_len == 0))
return -EAGAIN;
if ((!buf) || (count < sizeof(struct icmp_packet)))
return -EINVAL;
if (!access_ok(VERIFY_WRITE, buf, count))
return -EFAULT;
error = wait_event_interruptible(device_client->queue_wait,
device_client->queue_len);
if (error)
return error;
spin_lock_irqsave(&device_client->lock, flags);
device_packet = list_first_entry(&device_client->queue_list,
struct device_packet, list);
list_del(&device_packet->list);
device_client->queue_len--;
spin_unlock_irqrestore(&device_client->lock, flags);
error = __copy_to_user(buf, &device_packet->icmp_packet,
sizeof(struct icmp_packet));
kfree(device_packet);
if (error)
return error;
return sizeof(struct icmp_packet);
}
ssize_t bat_device_write(struct file *file, const char __user *buff,
size_t len, loff_t *off)
{
struct device_client *device_client =
(struct device_client *)file->private_data;
struct icmp_packet icmp_packet;
struct orig_node *orig_node;
struct batman_if *batman_if;
uint8_t dstaddr[ETH_ALEN];
unsigned long flags;
if (len < sizeof(struct icmp_packet)) {
bat_dbg(DBG_BATMAN, "batman-adv:"
"Error - can't send packet from char device: "
"invalid packet size\n");
return -EINVAL;
}
if (!access_ok(VERIFY_READ, buff, sizeof(struct icmp_packet)))
return -EFAULT;
if (__copy_from_user(&icmp_packet, buff, sizeof(icmp_packet)))
return -EFAULT;
if (icmp_packet.packet_type != BAT_ICMP) {
bat_dbg(DBG_BATMAN, "batman-adv:"
"Error - can't send packet from char device: "
"got bogus packet type (expected: BAT_ICMP)\n");
return -EINVAL;
}
if (icmp_packet.msg_type != ECHO_REQUEST) {
bat_dbg(DBG_BATMAN, "batman-adv:"
"Error - can't send packet from char device: "
"got bogus message type (expected: ECHO_REQUEST)\n");
return -EINVAL;
}
icmp_packet.uid = device_client->index;
if (icmp_packet.version != COMPAT_VERSION) {
icmp_packet.msg_type = PARAMETER_PROBLEM;
icmp_packet.ttl = COMPAT_VERSION;
bat_device_add_packet(device_client, &icmp_packet);
goto out;
}
if (atomic_read(&module_state) != MODULE_ACTIVE)
goto dst_unreach;
spin_lock_irqsave(&orig_hash_lock, flags);
orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet.dst));
if (!orig_node)
goto unlock;
if (!orig_node->router)
goto unlock;
batman_if = orig_node->router->if_incoming;
memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
spin_unlock_irqrestore(&orig_hash_lock, flags);
if (!batman_if)
goto dst_unreach;
if (batman_if->if_status != IF_ACTIVE)
goto dst_unreach;
memcpy(icmp_packet.orig,
batman_if->net_dev->dev_addr,
ETH_ALEN);
send_raw_packet((unsigned char *)&icmp_packet,
sizeof(struct icmp_packet),
batman_if, dstaddr);
goto out;
unlock:
spin_unlock_irqrestore(&orig_hash_lock, flags);
dst_unreach:
icmp_packet.msg_type = DESTINATION_UNREACHABLE;
bat_device_add_packet(device_client, &icmp_packet);
out:
return len;
}
unsigned int bat_device_poll(struct file *file, poll_table *wait)
{
struct device_client *device_client =
(struct device_client *)file->private_data;
poll_wait(file, &device_client->queue_wait, wait);
if (device_client->queue_len > 0)
return POLLIN | POLLRDNORM;
return 0;
}
void bat_device_add_packet(struct device_client *device_client,
struct icmp_packet *icmp_packet)
{
struct device_packet *device_packet;
unsigned long flags;
device_packet = kmalloc(sizeof(struct device_packet), GFP_ATOMIC);
if (!device_packet)
return;
INIT_LIST_HEAD(&device_packet->list);
memcpy(&device_packet->icmp_packet, icmp_packet,
sizeof(struct icmp_packet));
spin_lock_irqsave(&device_client->lock, flags);
/* while waiting for the lock the device_client could have been
* deleted */
if (!device_client_hash[icmp_packet->uid]) {
spin_unlock_irqrestore(&device_client->lock, flags);
kfree(device_packet);
return;
}
list_add_tail(&device_packet->list, &device_client->queue_list);
device_client->queue_len++;
if (device_client->queue_len > 100) {
device_packet = list_first_entry(&device_client->queue_list,
struct device_packet, list);
list_del(&device_packet->list);
kfree(device_packet);
device_client->queue_len--;
}
spin_unlock_irqrestore(&device_client->lock, flags);
wake_up(&device_client->queue_wait);
}
void bat_device_receive_packet(struct icmp_packet *icmp_packet)
{
struct device_client *hash = device_client_hash[icmp_packet->uid];
if (hash)
bat_device_add_packet(hash, icmp_packet);
}