net: Add batman-adv meshing protocol
B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is a routing protocol for multi-hop ad-hoc mesh networks. The networks may be wired or wireless. See http://www.open-mesh.org/ for more information and user space tools. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sven Eckelmann
committed by
David S. Miller
David S. Miller
parent
b236da6931
commit
c6c8fea297
356
net/batman-adv/icmp_socket.c
Normal file
356
net/batman-adv/icmp_socket.c
Normal file
@@ -0,0 +1,356 @@
|
||||
/*
|
||||
* 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 "main.h"
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/slab.h>
|
||||
#include "icmp_socket.h"
|
||||
#include "send.h"
|
||||
#include "types.h"
|
||||
#include "hash.h"
|
||||
#include "originator.h"
|
||||
#include "hard-interface.h"
|
||||
|
||||
static struct socket_client *socket_client_hash[256];
|
||||
|
||||
static void bat_socket_add_packet(struct socket_client *socket_client,
|
||||
struct icmp_packet_rr *icmp_packet,
|
||||
size_t icmp_len);
|
||||
|
||||
void bat_socket_init(void)
|
||||
{
|
||||
memset(socket_client_hash, 0, sizeof(socket_client_hash));
|
||||
}
|
||||
|
||||
static int bat_socket_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
unsigned int i;
|
||||
struct socket_client *socket_client;
|
||||
|
||||
nonseekable_open(inode, file);
|
||||
|
||||
socket_client = kmalloc(sizeof(struct socket_client), GFP_KERNEL);
|
||||
|
||||
if (!socket_client)
|
||||
return -ENOMEM;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(socket_client_hash); i++) {
|
||||
if (!socket_client_hash[i]) {
|
||||
socket_client_hash[i] = socket_client;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (i == ARRAY_SIZE(socket_client_hash)) {
|
||||
pr_err("Error - can't add another packet client: "
|
||||
"maximum number of clients reached\n");
|
||||
kfree(socket_client);
|
||||
return -EXFULL;
|
||||
}
|
||||
|
||||
INIT_LIST_HEAD(&socket_client->queue_list);
|
||||
socket_client->queue_len = 0;
|
||||
socket_client->index = i;
|
||||
socket_client->bat_priv = inode->i_private;
|
||||
spin_lock_init(&socket_client->lock);
|
||||
init_waitqueue_head(&socket_client->queue_wait);
|
||||
|
||||
file->private_data = socket_client;
|
||||
|
||||
inc_module_count();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bat_socket_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct socket_client *socket_client = file->private_data;
|
||||
struct socket_packet *socket_packet;
|
||||
struct list_head *list_pos, *list_pos_tmp;
|
||||
|
||||
spin_lock_bh(&socket_client->lock);
|
||||
|
||||
/* for all packets in the queue ... */
|
||||
list_for_each_safe(list_pos, list_pos_tmp, &socket_client->queue_list) {
|
||||
socket_packet = list_entry(list_pos,
|
||||
struct socket_packet, list);
|
||||
|
||||
list_del(list_pos);
|
||||
kfree(socket_packet);
|
||||
}
|
||||
|
||||
socket_client_hash[socket_client->index] = NULL;
|
||||
spin_unlock_bh(&socket_client->lock);
|
||||
|
||||
kfree(socket_client);
|
||||
dec_module_count();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t bat_socket_read(struct file *file, char __user *buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
struct socket_client *socket_client = file->private_data;
|
||||
struct socket_packet *socket_packet;
|
||||
size_t packet_len;
|
||||
int error;
|
||||
|
||||
if ((file->f_flags & O_NONBLOCK) && (socket_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(socket_client->queue_wait,
|
||||
socket_client->queue_len);
|
||||
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
spin_lock_bh(&socket_client->lock);
|
||||
|
||||
socket_packet = list_first_entry(&socket_client->queue_list,
|
||||
struct socket_packet, list);
|
||||
list_del(&socket_packet->list);
|
||||
socket_client->queue_len--;
|
||||
|
||||
spin_unlock_bh(&socket_client->lock);
|
||||
|
||||
error = __copy_to_user(buf, &socket_packet->icmp_packet,
|
||||
socket_packet->icmp_len);
|
||||
|
||||
packet_len = socket_packet->icmp_len;
|
||||
kfree(socket_packet);
|
||||
|
||||
if (error)
|
||||
return -EFAULT;
|
||||
|
||||
return packet_len;
|
||||
}
|
||||
|
||||
static ssize_t bat_socket_write(struct file *file, const char __user *buff,
|
||||
size_t len, loff_t *off)
|
||||
{
|
||||
struct socket_client *socket_client = file->private_data;
|
||||
struct bat_priv *bat_priv = socket_client->bat_priv;
|
||||
struct sk_buff *skb;
|
||||
struct icmp_packet_rr *icmp_packet;
|
||||
|
||||
struct orig_node *orig_node;
|
||||
struct batman_if *batman_if;
|
||||
size_t packet_len = sizeof(struct icmp_packet);
|
||||
uint8_t dstaddr[ETH_ALEN];
|
||||
|
||||
if (len < sizeof(struct icmp_packet)) {
|
||||
bat_dbg(DBG_BATMAN, bat_priv,
|
||||
"Error - can't send packet from char device: "
|
||||
"invalid packet size\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!bat_priv->primary_if)
|
||||
return -EFAULT;
|
||||
|
||||
if (len >= sizeof(struct icmp_packet_rr))
|
||||
packet_len = sizeof(struct icmp_packet_rr);
|
||||
|
||||
skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
skb_reserve(skb, sizeof(struct ethhdr));
|
||||
icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
|
||||
|
||||
if (!access_ok(VERIFY_READ, buff, packet_len)) {
|
||||
len = -EFAULT;
|
||||
goto free_skb;
|
||||
}
|
||||
|
||||
if (__copy_from_user(icmp_packet, buff, packet_len)) {
|
||||
len = -EFAULT;
|
||||
goto free_skb;
|
||||
}
|
||||
|
||||
if (icmp_packet->packet_type != BAT_ICMP) {
|
||||
bat_dbg(DBG_BATMAN, bat_priv,
|
||||
"Error - can't send packet from char device: "
|
||||
"got bogus packet type (expected: BAT_ICMP)\n");
|
||||
len = -EINVAL;
|
||||
goto free_skb;
|
||||
}
|
||||
|
||||
if (icmp_packet->msg_type != ECHO_REQUEST) {
|
||||
bat_dbg(DBG_BATMAN, bat_priv,
|
||||
"Error - can't send packet from char device: "
|
||||
"got bogus message type (expected: ECHO_REQUEST)\n");
|
||||
len = -EINVAL;
|
||||
goto free_skb;
|
||||
}
|
||||
|
||||
icmp_packet->uid = socket_client->index;
|
||||
|
||||
if (icmp_packet->version != COMPAT_VERSION) {
|
||||
icmp_packet->msg_type = PARAMETER_PROBLEM;
|
||||
icmp_packet->ttl = COMPAT_VERSION;
|
||||
bat_socket_add_packet(socket_client, icmp_packet, packet_len);
|
||||
goto free_skb;
|
||||
}
|
||||
|
||||
if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
|
||||
goto dst_unreach;
|
||||
|
||||
spin_lock_bh(&bat_priv->orig_hash_lock);
|
||||
orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
|
||||
compare_orig, choose_orig,
|
||||
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_bh(&bat_priv->orig_hash_lock);
|
||||
|
||||
if (!batman_if)
|
||||
goto dst_unreach;
|
||||
|
||||
if (batman_if->if_status != IF_ACTIVE)
|
||||
goto dst_unreach;
|
||||
|
||||
memcpy(icmp_packet->orig,
|
||||
bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
|
||||
|
||||
if (packet_len == sizeof(struct icmp_packet_rr))
|
||||
memcpy(icmp_packet->rr, batman_if->net_dev->dev_addr, ETH_ALEN);
|
||||
|
||||
|
||||
send_skb_packet(skb, batman_if, dstaddr);
|
||||
|
||||
goto out;
|
||||
|
||||
unlock:
|
||||
spin_unlock_bh(&bat_priv->orig_hash_lock);
|
||||
dst_unreach:
|
||||
icmp_packet->msg_type = DESTINATION_UNREACHABLE;
|
||||
bat_socket_add_packet(socket_client, icmp_packet, packet_len);
|
||||
free_skb:
|
||||
kfree_skb(skb);
|
||||
out:
|
||||
return len;
|
||||
}
|
||||
|
||||
static unsigned int bat_socket_poll(struct file *file, poll_table *wait)
|
||||
{
|
||||
struct socket_client *socket_client = file->private_data;
|
||||
|
||||
poll_wait(file, &socket_client->queue_wait, wait);
|
||||
|
||||
if (socket_client->queue_len > 0)
|
||||
return POLLIN | POLLRDNORM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct file_operations fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = bat_socket_open,
|
||||
.release = bat_socket_release,
|
||||
.read = bat_socket_read,
|
||||
.write = bat_socket_write,
|
||||
.poll = bat_socket_poll,
|
||||
.llseek = no_llseek,
|
||||
};
|
||||
|
||||
int bat_socket_setup(struct bat_priv *bat_priv)
|
||||
{
|
||||
struct dentry *d;
|
||||
|
||||
if (!bat_priv->debug_dir)
|
||||
goto err;
|
||||
|
||||
d = debugfs_create_file(ICMP_SOCKET, S_IFREG | S_IWUSR | S_IRUSR,
|
||||
bat_priv->debug_dir, bat_priv, &fops);
|
||||
if (d)
|
||||
goto err;
|
||||
|
||||
return 0;
|
||||
|
||||
err:
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void bat_socket_add_packet(struct socket_client *socket_client,
|
||||
struct icmp_packet_rr *icmp_packet,
|
||||
size_t icmp_len)
|
||||
{
|
||||
struct socket_packet *socket_packet;
|
||||
|
||||
socket_packet = kmalloc(sizeof(struct socket_packet), GFP_ATOMIC);
|
||||
|
||||
if (!socket_packet)
|
||||
return;
|
||||
|
||||
INIT_LIST_HEAD(&socket_packet->list);
|
||||
memcpy(&socket_packet->icmp_packet, icmp_packet, icmp_len);
|
||||
socket_packet->icmp_len = icmp_len;
|
||||
|
||||
spin_lock_bh(&socket_client->lock);
|
||||
|
||||
/* while waiting for the lock the socket_client could have been
|
||||
* deleted */
|
||||
if (!socket_client_hash[icmp_packet->uid]) {
|
||||
spin_unlock_bh(&socket_client->lock);
|
||||
kfree(socket_packet);
|
||||
return;
|
||||
}
|
||||
|
||||
list_add_tail(&socket_packet->list, &socket_client->queue_list);
|
||||
socket_client->queue_len++;
|
||||
|
||||
if (socket_client->queue_len > 100) {
|
||||
socket_packet = list_first_entry(&socket_client->queue_list,
|
||||
struct socket_packet, list);
|
||||
|
||||
list_del(&socket_packet->list);
|
||||
kfree(socket_packet);
|
||||
socket_client->queue_len--;
|
||||
}
|
||||
|
||||
spin_unlock_bh(&socket_client->lock);
|
||||
|
||||
wake_up(&socket_client->queue_wait);
|
||||
}
|
||||
|
||||
void bat_socket_receive_packet(struct icmp_packet_rr *icmp_packet,
|
||||
size_t icmp_len)
|
||||
{
|
||||
struct socket_client *hash = socket_client_hash[icmp_packet->uid];
|
||||
|
||||
if (hash)
|
||||
bat_socket_add_packet(hash, icmp_packet, icmp_len);
|
||||
}
|
||||
Reference in New Issue
Block a user