/*
* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
* 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 "bat_sysfs.h"
#include "bat_debugfs.h"
#include "routing.h"
#include "send.h"
#include "originator.h"
#include "soft-interface.h"
#include "icmp_socket.h"
#include "translation-table.h"
#include "hard-interface.h"
#include "gateway_client.h"
#include "bridge_loop_avoidance.h"
#include "vis.h"
#include "hash.h"
#include "bat_algo.h"
/* List manipulations on hardif_list have to be rtnl_lock()'ed,
* list traversals just rcu-locked */
struct list_head hardif_list;
static int (*recv_packet_handler[256])(struct sk_buff *, struct hard_iface *);
char bat_routing_algo[20] = "BATMAN IV";
static struct hlist_head bat_algo_list;
unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
struct workqueue_struct *bat_event_workqueue;
static void recv_handler_init(void);
static int __init batman_init(void)
{
INIT_LIST_HEAD(&hardif_list);
INIT_HLIST_HEAD(&bat_algo_list);
recv_handler_init();
bat_iv_init();
/* the name should not be longer than 10 chars - see
* http://lwn.net/Articles/23634/ */
bat_event_workqueue = create_singlethread_workqueue("bat_events");
if (!bat_event_workqueue)
return -ENOMEM;
bat_socket_init();
debugfs_init();
register_netdevice_notifier(&hard_if_notifier);
pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
SOURCE_VERSION, COMPAT_VERSION);
return 0;
}
static void __exit batman_exit(void)
{
debugfs_destroy();
unregister_netdevice_notifier(&hard_if_notifier);
hardif_remove_interfaces();
flush_workqueue(bat_event_workqueue);
destroy_workqueue(bat_event_workqueue);
bat_event_workqueue = NULL;
rcu_barrier();
}
int mesh_init(struct net_device *soft_iface)
{
struct bat_priv *bat_priv = netdev_priv(soft_iface);
spin_lock_init(&bat_priv->forw_bat_list_lock);
spin_lock_init(&bat_priv->forw_bcast_list_lock);
spin_lock_init(&bat_priv->tt_changes_list_lock);
spin_lock_init(&bat_priv->tt_req_list_lock);
spin_lock_init(&bat_priv->tt_roam_list_lock);
spin_lock_init(&bat_priv->tt_buff_lock);
spin_lock_init(&bat_priv->gw_list_lock);
spin_lock_init(&bat_priv->vis_hash_lock);
spin_lock_init(&bat_priv->vis_list_lock);
INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
INIT_HLIST_HEAD(&bat_priv->gw_list);
INIT_LIST_HEAD(&bat_priv->tt_changes_list);
INIT_LIST_HEAD(&bat_priv->tt_req_list);
INIT_LIST_HEAD(&bat_priv->tt_roam_list);
if (originator_init(bat_priv) < 1)
goto err;
if (tt_init(bat_priv) < 1)
goto err;
tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX);
if (vis_init(bat_priv) < 1)
goto err;
if (bla_init(bat_priv) < 1)
goto err;
atomic_set(&bat_priv->gw_reselect, 0);
atomic_set(&bat_priv->mesh_state, MESH_ACTIVE);
goto end;
err:
mesh_free(soft_iface);
return -1;
end:
return 0;
}
void mesh_free(struct net_device *soft_iface)
{
struct bat_priv *bat_priv = netdev_priv(soft_iface);
atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING);
purge_outstanding_packets(bat_priv, NULL);
vis_quit(bat_priv);
gw_node_purge(bat_priv);
originator_free(bat_priv);
tt_free(bat_priv);
bla_free(bat_priv);
atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
}
void inc_module_count(void)
{
try_module_get(THIS_MODULE);
}
void dec_module_count(void)
{
module_put(THIS_MODULE);
}
int is_my_mac(const uint8_t *addr)
{
const struct hard_iface *hard_iface;
rcu_read_lock();
list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
if (hard_iface->if_status != IF_ACTIVE)
continue;
if (compare_eth(hard_iface->net_dev->dev_addr, addr)) {
rcu_read_unlock();
return 1;
}
}
rcu_read_unlock();
return 0;
}
static int recv_unhandled_packet(struct sk_buff *skb,
struct hard_iface *recv_if)
{
return NET_RX_DROP;
}
/* incoming packets with the batman ethertype received on any active hard
* interface
*/
int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype, struct net_device *orig_dev)
{
struct bat_priv *bat_priv;
struct batman_ogm_packet *batman_ogm_packet;
struct hard_iface *hard_iface;
uint8_t idx;
int ret;
hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
skb = skb_share_check(skb, GFP_ATOMIC);
/* skb was released by skb_share_check() */
if (!skb)
goto err_out;
/* packet should hold at least type and version */
if (unlikely(!pskb_may_pull(skb, 2)))
goto err_free;
/* expect a valid ethernet header here. */
if (unlikely(skb->mac_len != ETH_HLEN || !skb_mac_header(skb)))
goto err_free;
if (!hard_iface->soft_iface)
goto err_free;
bat_priv = netdev_priv(hard_iface->soft_iface);
if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
goto err_free;
/* discard frames on not active interfaces */
if (hard_iface->if_status != IF_ACTIVE)
goto err_free;
batman_ogm_packet = (struct batman_ogm_packet *)skb->data;
if (batman_ogm_packet->header.version != COMPAT_VERSION) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: incompatible batman version (%i)\n",
batman_ogm_packet->header.version);
goto err_free;
}
/* all receive handlers return whether they received or reused
* the supplied skb. if not, we have to free the skb.
*/
idx = batman_ogm_packet->header.packet_type;
ret = (*recv_packet_handler[idx])(skb, hard_iface);
if (ret == NET_RX_DROP)
kfree_skb(skb);
/* return NET_RX_SUCCESS in any case as we
* most probably dropped the packet for
* routing-logical reasons.
*/
return NET_RX_SUCCESS;
err_free:
kfree_skb(skb);
err_out:
return NET_RX_DROP;
}
static void recv_handler_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(recv_packet_handler); i++)
recv_packet_handler[i] = recv_unhandled_packet;
/* batman icmp packet */
recv_packet_handler[BAT_ICMP] = recv_icmp_packet;
/* unicast packet */
recv_packet_handler[BAT_UNICAST] = recv_unicast_packet;
/* fragmented unicast packet */
recv_packet_handler[BAT_UNICAST_FRAG] = recv_ucast_frag_packet;
/* broadcast packet */
recv_packet_handler[BAT_BCAST] = recv_bcast_packet;
/* vis packet */
recv_packet_handler[BAT_VIS] = recv_vis_packet;
/* Translation table query (request or response) */
recv_packet_handler[BAT_TT_QUERY] = recv_tt_query;
/* Roaming advertisement */
recv_packet_handler[BAT_ROAM_ADV] = recv_roam_adv;
}
int recv_handler_register(uint8_t packet_type,
int (*recv_handler)(struct sk_buff *,
struct hard_iface *))
{
if (recv_packet_handler[packet_type] != &recv_unhandled_packet)
return -EBUSY;
recv_packet_handler[packet_type] = recv_handler;
return 0;
}
void recv_handler_unregister(uint8_t packet_type)
{
recv_packet_handler[packet_type] = recv_unhandled_packet;
}
static struct bat_algo_ops *bat_algo_get(char *name)
{
struct bat_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
struct hlist_node *node;
hlist_for_each_entry(bat_algo_ops_tmp, node, &bat_algo_list, list) {
if (strcmp(bat_algo_ops_tmp->name, name) != 0)
continue;
bat_algo_ops = bat_algo_ops_tmp;
break;
}
return bat_algo_ops;
}
int bat_algo_register(struct bat_algo_ops *bat_algo_ops)
{
struct bat_algo_ops *bat_algo_ops_tmp;
int ret = -1;
bat_algo_ops_tmp = bat_algo_get(bat_algo_ops->name);
if (bat_algo_ops_tmp) {
pr_info("Trying to register already registered routing algorithm: %s\n",
bat_algo_ops->name);
goto out;
}
/* all algorithms must implement all ops (for now) */
if (!bat_algo_ops->bat_iface_enable ||
!bat_algo_ops->bat_iface_disable ||
!bat_algo_ops->bat_iface_update_mac ||
!bat_algo_ops->bat_primary_iface_set ||
!bat_algo_ops->bat_ogm_schedule ||
!bat_algo_ops->bat_ogm_emit) {
pr_info("Routing algo '%s' does not implement required ops\n",
bat_algo_ops->name);
goto out;
}
INIT_HLIST_NODE(&bat_algo_ops->list);
hlist_add_head(&bat_algo_ops->list, &bat_algo_list);
ret = 0;
out:
return ret;
}
int bat_algo_select(struct bat_priv *bat_priv, char *name)
{
struct bat_algo_ops *bat_algo_ops;
int ret = -1;
bat_algo_ops = bat_algo_get(name);
if (!bat_algo_ops)
goto out;
bat_priv->bat_algo_ops = bat_algo_ops;
ret = 0;
out:
return ret;
}
int bat_algo_seq_print_text(struct seq_file *seq, void *offset)
{
struct bat_algo_ops *bat_algo_ops;
struct hlist_node *node;
seq_printf(seq, "Available routing algorithms:\n");
hlist_for_each_entry(bat_algo_ops, node, &bat_algo_list, list) {
seq_printf(seq, "%s\n", bat_algo_ops->name);
}
return 0;
}
static int param_set_ra(const char *val, const struct kernel_param *kp)
{
struct bat_algo_ops *bat_algo_ops;
bat_algo_ops = bat_algo_get((char *)val);
if (!bat_algo_ops) {
pr_err("Routing algorithm '%s' is not supported\n", val);
return -EINVAL;
}
return param_set_copystring(val, kp);
}
static const struct kernel_param_ops param_ops_ra = {
.set = param_set_ra,
.get = param_get_string,
};
static struct kparam_string __param_string_ra = {
.maxlen = sizeof(bat_routing_algo),
.string = bat_routing_algo,
};
module_param_cb(routing_algo, ¶m_ops_ra, &__param_string_ra, 0644);
module_init(batman_init);
module_exit(batman_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
MODULE_VERSION(SOURCE_VERSION);