[linux-block.git] / net / batman-adv / main.c

/*
 * 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;
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 int __init batman_init(void)
{
	INIT_LIST_HEAD(&hardif_list);
	INIT_HLIST_HEAD(&bat_algo_list);

	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 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_primary_iface_set ||
	    !bat_algo_ops->bat_ogm_update_mac ||
	    !bat_algo_ops->bat_ogm_schedule ||
	    !bat_algo_ops->bat_ogm_emit ||
	    !bat_algo_ops->bat_ogm_receive) {
		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, &param_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);
Commit	Line	Data
c6c8fea2	1	/*
567db7b0	2	* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
c6c8fea2 SE	3	*
	4	* Marek Lindner, Simon Wunderlich
	5	*
	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.
	9	*
	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.
	14	*
	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
	18	* 02110-1301, USA
	19	*
	20	*/
	21
	22	#include "main.h"
	23	#include "bat_sysfs.h"
	24	#include "bat_debugfs.h"
	25	#include "routing.h"
	26	#include "send.h"
	27	#include "originator.h"
	28	#include "soft-interface.h"
	29	#include "icmp_socket.h"
	30	#include "translation-table.h"
	31	#include "hard-interface.h"
	32	#include "gateway_client.h"
23721387	33	#include "bridge_loop_avoidance.h"
c6c8fea2 SE	34	#include "vis.h"
c6c8fea2 SE	35	#include "hash.h"
1c280471	36	#include "bat_algo.h"
c6c8fea2	37
c3caf519 SE	38
	39	/* List manipulations on hardif_list have to be rtnl_lock()'ed,
	40	* list traversals just rcu-locked */
4389e47a	41	struct list_head hardif_list;
1c280471 ML	42	char bat_routing_algo[20] = "BATMAN IV";
1c280471 ML	43	static struct hlist_head bat_algo_list;
c6c8fea2 SE	44
	45	unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
	46
	47	struct workqueue_struct *bat_event_workqueue;
	48
	49	static int __init batman_init(void)
	50	{
4389e47a	51	INIT_LIST_HEAD(&hardif_list);
1c280471 ML	52	INIT_HLIST_HEAD(&bat_algo_list);
	53
	54	bat_iv_init();
c6c8fea2 SE	55
	56	/* the name should not be longer than 10 chars - see
	57	* http://lwn.net/Articles/23634/ */
	58	bat_event_workqueue = create_singlethread_workqueue("bat_events");
	59
	60	if (!bat_event_workqueue)
	61	return -ENOMEM;
	62
	63	bat_socket_init();
	64	debugfs_init();
	65
	66	register_netdevice_notifier(&hard_if_notifier);
	67
86ceb360 SE	68	pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
86ceb360 SE	69	SOURCE_VERSION, COMPAT_VERSION);
c6c8fea2 SE	70
	71	return 0;
	72	}
	73
	74	static void __exit batman_exit(void)
	75	{
	76	debugfs_destroy();
	77	unregister_netdevice_notifier(&hard_if_notifier);
	78	hardif_remove_interfaces();
	79
	80	flush_workqueue(bat_event_workqueue);
	81	destroy_workqueue(bat_event_workqueue);
	82	bat_event_workqueue = NULL;
	83
	84	rcu_barrier();
	85	}
	86
	87	int mesh_init(struct net_device *soft_iface)
	88	{
	89	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	90
c6c8fea2 SE	91	spin_lock_init(&bat_priv->forw_bat_list_lock);
c6c8fea2 SE	92	spin_lock_init(&bat_priv->forw_bcast_list_lock);
a73105b8 AQ	93	spin_lock_init(&bat_priv->tt_changes_list_lock);
a73105b8 AQ	94	spin_lock_init(&bat_priv->tt_req_list_lock);
cc47f66e	95	spin_lock_init(&bat_priv->tt_roam_list_lock);
a73105b8	96	spin_lock_init(&bat_priv->tt_buff_lock);
c6c8fea2 SE	97	spin_lock_init(&bat_priv->gw_list_lock);
	98	spin_lock_init(&bat_priv->vis_hash_lock);
	99	spin_lock_init(&bat_priv->vis_list_lock);
c6c8fea2 SE	100
	101	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
	102	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
	103	INIT_HLIST_HEAD(&bat_priv->gw_list);
a73105b8 AQ	104	INIT_LIST_HEAD(&bat_priv->tt_changes_list);
a73105b8 AQ	105	INIT_LIST_HEAD(&bat_priv->tt_req_list);
cc47f66e	106	INIT_LIST_HEAD(&bat_priv->tt_roam_list);
c6c8fea2 SE	107
	108	if (originator_init(bat_priv) < 1)
	109	goto err;
	110
a73105b8	111	if (tt_init(bat_priv) < 1)
c6c8fea2 SE	112	goto err;
c6c8fea2 SE	113
bc279080	114	tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX);
c6c8fea2 SE	115
	116	if (vis_init(bat_priv) < 1)
	117	goto err;
	118
23721387 SW	119	if (bla_init(bat_priv) < 1)
	120	goto err;
	121
2265c141	122	atomic_set(&bat_priv->gw_reselect, 0);
c6c8fea2 SE	123	atomic_set(&bat_priv->mesh_state, MESH_ACTIVE);
	124	goto end;
	125
	126	err:
c6c8fea2 SE	127	mesh_free(soft_iface);
	128	return -1;
	129
	130	end:
	131	return 0;
	132	}
	133
	134	void mesh_free(struct net_device *soft_iface)
	135	{
	136	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	137
	138	atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING);
	139
	140	purge_outstanding_packets(bat_priv, NULL);
	141
	142	vis_quit(bat_priv);
	143
	144	gw_node_purge(bat_priv);
	145	originator_free(bat_priv);
	146
a73105b8	147	tt_free(bat_priv);
c6c8fea2	148
23721387 SW	149	bla_free(bat_priv);
23721387 SW	150
c6c8fea2 SE	151	atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
	152	}
	153
	154	void inc_module_count(void)
	155	{
	156	try_module_get(THIS_MODULE);
	157	}
	158
	159	void dec_module_count(void)
	160	{
	161	module_put(THIS_MODULE);
	162	}
	163
747e4221	164	int is_my_mac(const uint8_t *addr)
c6c8fea2	165	{
747e4221	166	const struct hard_iface *hard_iface;
c6c8fea2 SE	167
c6c8fea2 SE	168	rcu_read_lock();
e6c10f43 ML	169	list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
e6c10f43 ML	170	if (hard_iface->if_status != IF_ACTIVE)
c6c8fea2 SE	171	continue;
c6c8fea2 SE	172
e6c10f43	173	if (compare_eth(hard_iface->net_dev->dev_addr, addr)) {
c6c8fea2 SE	174	rcu_read_unlock();
	175	return 1;
	176	}
	177	}
	178	rcu_read_unlock();
	179	return 0;
c6c8fea2 SE	180	}
c6c8fea2 SE	181
1c280471 ML	182	static struct bat_algo_ops bat_algo_get(char name)
	183	{
	184	struct bat_algo_ops bat_algo_ops = NULL, bat_algo_ops_tmp;
	185	struct hlist_node *node;
	186
	187	hlist_for_each_entry(bat_algo_ops_tmp, node, &bat_algo_list, list) {
	188	if (strcmp(bat_algo_ops_tmp->name, name) != 0)
	189	continue;
	190
	191	bat_algo_ops = bat_algo_ops_tmp;
	192	break;
	193	}
	194
	195	return bat_algo_ops;
	196	}
	197
	198	int bat_algo_register(struct bat_algo_ops *bat_algo_ops)
	199	{
	200	struct bat_algo_ops *bat_algo_ops_tmp;
	201	int ret = -1;
	202
	203	bat_algo_ops_tmp = bat_algo_get(bat_algo_ops->name);
	204	if (bat_algo_ops_tmp) {
86ceb360 SE	205	pr_info("Trying to register already registered routing algorithm: %s\n",
86ceb360 SE	206	bat_algo_ops->name);
1c280471 ML	207	goto out;
	208	}
	209
01c4224b	210	/* all algorithms must implement all ops (for now) */
c2aca022	211	if (!bat_algo_ops->bat_iface_enable \|\|
00a50076	212	!bat_algo_ops->bat_iface_disable \|\|
cd8b78e7	213	!bat_algo_ops->bat_primary_iface_set \|\|
01c4224b ML	214	!bat_algo_ops->bat_ogm_update_mac \|\|
	215	!bat_algo_ops->bat_ogm_schedule \|\|
	216	!bat_algo_ops->bat_ogm_emit \|\|
	217	!bat_algo_ops->bat_ogm_receive) {
	218	pr_info("Routing algo '%s' does not implement required ops\n",
	219	bat_algo_ops->name);
	220	goto out;
	221	}
	222
1c280471 ML	223	INIT_HLIST_NODE(&bat_algo_ops->list);
	224	hlist_add_head(&bat_algo_ops->list, &bat_algo_list);
	225	ret = 0;
	226
	227	out:
	228	return ret;
	229	}
	230
	231	int bat_algo_select(struct bat_priv bat_priv, char name)
	232	{
	233	struct bat_algo_ops *bat_algo_ops;
	234	int ret = -1;
	235
	236	bat_algo_ops = bat_algo_get(name);
	237	if (!bat_algo_ops)
	238	goto out;
	239
	240	bat_priv->bat_algo_ops = bat_algo_ops;
	241	ret = 0;
	242
	243	out:
	244	return ret;
	245	}
	246
	247	int bat_algo_seq_print_text(struct seq_file seq, void offset)
	248	{
	249	struct bat_algo_ops *bat_algo_ops;
	250	struct hlist_node *node;
	251
	252	seq_printf(seq, "Available routing algorithms:\n");
	253
	254	hlist_for_each_entry(bat_algo_ops, node, &bat_algo_list, list) {
	255	seq_printf(seq, "%s\n", bat_algo_ops->name);
	256	}
	257
	258	return 0;
	259	}
	260
d419be1f ML	261	static int param_set_ra(const char val, const struct kernel_param kp)
	262	{
	263	struct bat_algo_ops *bat_algo_ops;
	264
	265	bat_algo_ops = bat_algo_get((char *)val);
	266	if (!bat_algo_ops) {
	267	pr_err("Routing algorithm '%s' is not supported\n", val);
	268	return -EINVAL;
	269	}
	270
	271	return param_set_copystring(val, kp);
	272	}
	273
	274	static const struct kernel_param_ops param_ops_ra = {
	275	.set = param_set_ra,
	276	.get = param_get_string,
	277	};
	278
	279	static struct kparam_string __param_string_ra = {
	280	.maxlen = sizeof(bat_routing_algo),
	281	.string = bat_routing_algo,
	282	};
	283
	284	module_param_cb(routing_algo, &param_ops_ra, &__param_string_ra, 0644);
c6c8fea2 SE	285	module_init(batman_init);
	286	module_exit(batman_exit);
	287
	288	MODULE_LICENSE("GPL");
	289
	290	MODULE_AUTHOR(DRIVER_AUTHOR);
	291	MODULE_DESCRIPTION(DRIVER_DESC);
	292	MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
c6c8fea2	293	MODULE_VERSION(SOURCE_VERSION);