path: root/net/batman-adv/main.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2007-2020  B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 */

#include "main.h"

#include <linux/atomic.h>
#include <linux/build_bug.h>
#include <linux/byteorder/generic.h>
#include <linux/crc32c.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/genetlink.h>
#include <linux/gfp.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/kernel.h>
#include <linux/kobject.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/printk.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/workqueue.h>
#include <net/dsfield.h>
#include <net/rtnetlink.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>

#include "bat_algo.h"
#include "bat_iv_ogm.h"
#include "bat_v.h"
#include "bridge_loop_avoidance.h"
#include "distributed-arp-table.h"
#include "gateway_client.h"
#include "gateway_common.h"
#include "hard-interface.h"
#include "log.h"
#include "multicast.h"
#include "netlink.h"
#include "network-coding.h"
#include "originator.h"
#include "routing.h"
#include "send.h"
#include "soft-interface.h"
#include "tp_meter.h"
#include "translation-table.h"

/* List manipulations on hardif_list have to be rtnl_lock()'ed,
 * list traversals just rcu-locked
 */
struct list_head batadv_hardif_list;
unsigned int batadv_hardif_generation;
static int (*batadv_rx_handler[256])(struct sk_buff *skb,
				     struct batadv_hard_iface *recv_if);

unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

struct workqueue_struct *batadv_event_workqueue;

static void batadv_recv_handler_init(void);

#define BATADV_UEV_TYPE_VAR	"BATTYPE="
#define BATADV_UEV_ACTION_VAR	"BATACTION="
#define BATADV_UEV_DATA_VAR	"BATDATA="

static char *batadv_uev_action_str[] = {
	"add",
	"del",
	"change",
	"loopdetect",
};

static char *batadv_uev_type_str[] = {
	"gw",
	"bla",
};

static int __init batadv_init(void)
{
	int ret;

	ret = batadv_tt_cache_init();
	if (ret < 0)
		return ret;

	INIT_LIST_HEAD(&batadv_hardif_list);
	batadv_algo_init();

	batadv_recv_handler_init();

	batadv_v_init();
	batadv_iv_init();
	batadv_nc_init();
	batadv_tp_meter_init();

	batadv_event_workqueue = create_singlethread_workqueue("bat_events");
	if (!batadv_event_workqueue)
		goto err_create_wq;

	register_netdevice_notifier(&batadv_hard_if_notifier);
	rtnl_link_register(&batadv_link_ops);
	batadv_netlink_register();

	pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
		BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);

	return 0;

err_create_wq:
	batadv_tt_cache_destroy();

	return -ENOMEM;
}

static void __exit batadv_exit(void)
{
	batadv_netlink_unregister();
	rtnl_link_unregister(&batadv_link_ops);
	unregister_netdevice_notifier(&batadv_hard_if_notifier);

	flush_workqueue(batadv_event_workqueue);
	destroy_workqueue(batadv_event_workqueue);
	batadv_event_workqueue = NULL;

	rcu_barrier();

	batadv_tt_cache_destroy();
}

/**
 * batadv_mesh_init() - Initialize soft interface
 * @soft_iface: netdev struct of the soft interface
 *
 * Return: 0 on success or negative error number in case of failure
 */
int batadv_mesh_init(struct net_device *soft_iface)
{
	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	int ret;

	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.last_changeset_lock);
	spin_lock_init(&bat_priv->tt.commit_lock);
	spin_lock_init(&bat_priv->gw.list_lock);
#ifdef CONFIG_BATMAN_ADV_MCAST
	spin_lock_init(&bat_priv->mcast.mla_lock);
	spin_lock_init(&bat_priv->mcast.want_lists_lock);
#endif
	spin_lock_init(&bat_priv->tvlv.container_list_lock);
	spin_lock_init(&bat_priv->tvlv.handler_list_lock);
	spin_lock_init(&bat_priv->softif_vlan_list_lock);
	spin_lock_init(&bat_priv->tp_list_lock);

	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
	INIT_HLIST_HEAD(&bat_priv->gw.gateway_list);
#ifdef CONFIG_BATMAN_ADV_MCAST
	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
#endif
	INIT_LIST_HEAD(&bat_priv->tt.changes_list);
	INIT_HLIST_HEAD(&bat_priv->tt.req_list);
	INIT_LIST_HEAD(&bat_priv->tt.roam_list);
#ifdef CONFIG_BATMAN_ADV_MCAST
	INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
#endif
	INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
	INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
	INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
	INIT_HLIST_HEAD(&bat_priv->tp_list);

	bat_priv->gw.generation = 0;

	ret = batadv_v_mesh_init(bat_priv);
	if (ret < 0)
		goto err;

	ret = batadv_originator_init(bat_priv);
	if (ret < 0)
		goto err;

	ret = batadv_tt_init(bat_priv);
	if (ret < 0)
		goto err;

	ret = batadv_bla_init(bat_priv);
	if (ret < 0)
		goto err;

	ret = batadv_dat_init(bat_priv);
	if (ret < 0)
		goto err;

	ret = batadv_nc_mesh_init(bat_priv);
	if (ret < 0)
		goto err;

	batadv_gw_init(bat_priv);
	batadv_mcast_init(bat_priv);

	atomic_set(&bat_priv->gw.reselect, 0);
	atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);

	return 0;

err:
	batadv_mesh_free(soft_iface);
	return ret;
}

/**
 * batadv_mesh_free() - Deinitialize soft interface
 * @soft_iface: netdev struct of the soft interface
 */
void batadv_mesh_free(struct net_device *soft_iface)
{
	struct batadv_priv *bat_priv = netdev_priv(soft_iface);

	atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);

	batadv_purge_outstanding_packets(bat_priv, NULL);

	batadv_gw_node_free(bat_priv);

	batadv_v_mesh_free(bat_priv);
	batadv_nc_mesh_free(bat_priv);
	batadv_dat_free(bat_priv);
	batadv_bla_free(bat_priv);

	batadv_mcast_free(bat_priv);

	/* Free the TT and the originator tables only after having terminated
	 * all the other depending components which may use these structures for
	 * their purposes.
	 */
	batadv_tt_free(bat_priv);

	/* Since the originator table clean up routine is accessing the TT
	 * tables as well, it has to be invoked after the TT tables have been
	 * freed and marked as empty. This ensures that no cleanup RCU callbacks
	 * accessing the TT data are scheduled for later execution.
	 */
	batadv_originator_free(bat_priv);

	batadv_gw_free(bat_priv);

	free_percpu(bat_priv->bat_counters);
	bat_priv->bat_counters