[mirror_ubuntu-artful-kernel.git] / net / batman-adv / main.c

/*
 * Copyright (C) 2007-2011 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 "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);
	spin_lock_init(&bat_priv->softif_neigh_lock);
	spin_lock_init(&bat_priv->softif_neigh_vid_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_HLIST_HEAD(&bat_priv->softif_neigh_vids);
	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;

	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);

	softif_neigh_purge(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_ogm_init ||
	    !bat_algo_ops->bat_ogm_init_primary ||
	    !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	/*
64afe353	2	* Copyright (C) 2007-2011 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"
c6c8fea2 SE	33	#include "vis.h"
c6c8fea2 SE	34	#include "hash.h"
1c280471	35	#include "bat_algo.h"
c6c8fea2	36
c3caf519 SE	37
	38	/* List manipulations on hardif_list have to be rtnl_lock()'ed,
	39	* list traversals just rcu-locked */
4389e47a	40	struct list_head hardif_list;
1c280471 ML	41	char bat_routing_algo[20] = "BATMAN IV";
1c280471 ML	42	static struct hlist_head bat_algo_list;
c6c8fea2 SE	43
	44	unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
	45
	46	struct workqueue_struct *bat_event_workqueue;
	47
	48	static int __init batman_init(void)
	49	{
4389e47a	50	INIT_LIST_HEAD(&hardif_list);
1c280471 ML	51	INIT_HLIST_HEAD(&bat_algo_list);
	52
	53	bat_iv_init();
c6c8fea2 SE	54
	55	/* the name should not be longer than 10 chars - see
	56	* http://lwn.net/Articles/23634/ */
	57	bat_event_workqueue = create_singlethread_workqueue("bat_events");
	58
	59	if (!bat_event_workqueue)
	60	return -ENOMEM;
	61
	62	bat_socket_init();
	63	debugfs_init();
	64
	65	register_netdevice_notifier(&hard_if_notifier);
	66
44c4349a SE	67	pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) "
44c4349a SE	68	"loaded\n", SOURCE_VERSION, COMPAT_VERSION);
c6c8fea2 SE	69
	70	return 0;
	71	}
	72
	73	static void __exit batman_exit(void)
	74	{
	75	debugfs_destroy();
	76	unregister_netdevice_notifier(&hard_if_notifier);
	77	hardif_remove_interfaces();
	78
	79	flush_workqueue(bat_event_workqueue);
	80	destroy_workqueue(bat_event_workqueue);
	81	bat_event_workqueue = NULL;
	82
	83	rcu_barrier();
	84	}
	85
	86	int mesh_init(struct net_device *soft_iface)
	87	{
	88	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	89
c6c8fea2 SE	90	spin_lock_init(&bat_priv->forw_bat_list_lock);
c6c8fea2 SE	91	spin_lock_init(&bat_priv->forw_bcast_list_lock);
a73105b8 AQ	92	spin_lock_init(&bat_priv->tt_changes_list_lock);
a73105b8 AQ	93	spin_lock_init(&bat_priv->tt_req_list_lock);
cc47f66e	94	spin_lock_init(&bat_priv->tt_roam_list_lock);
a73105b8	95	spin_lock_init(&bat_priv->tt_buff_lock);
c6c8fea2 SE	96	spin_lock_init(&bat_priv->gw_list_lock);
	97	spin_lock_init(&bat_priv->vis_hash_lock);
	98	spin_lock_init(&bat_priv->vis_list_lock);
	99	spin_lock_init(&bat_priv->softif_neigh_lock);
61906ae8	100	spin_lock_init(&bat_priv->softif_neigh_vid_lock);
c6c8fea2 SE	101
	102	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
	103	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
	104	INIT_HLIST_HEAD(&bat_priv->gw_list);
61906ae8	105	INIT_HLIST_HEAD(&bat_priv->softif_neigh_vids);
a73105b8 AQ	106	INIT_LIST_HEAD(&bat_priv->tt_changes_list);
a73105b8 AQ	107	INIT_LIST_HEAD(&bat_priv->tt_req_list);
cc47f66e	108	INIT_LIST_HEAD(&bat_priv->tt_roam_list);
c6c8fea2 SE	109
	110	if (originator_init(bat_priv) < 1)
	111	goto err;
	112
a73105b8	113	if (tt_init(bat_priv) < 1)
c6c8fea2 SE	114	goto err;
c6c8fea2 SE	115
bc279080	116	tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX);
c6c8fea2 SE	117
	118	if (vis_init(bat_priv) < 1)
	119	goto err;
	120
2265c141	121	atomic_set(&bat_priv->gw_reselect, 0);
c6c8fea2 SE	122	atomic_set(&bat_priv->mesh_state, MESH_ACTIVE);
	123	goto end;
	124
	125	err:
c6c8fea2 SE	126	mesh_free(soft_iface);
	127	return -1;
	128
	129	end:
	130	return 0;
	131	}
	132
	133	void mesh_free(struct net_device *soft_iface)
	134	{
	135	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	136
	137	atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING);
	138
	139	purge_outstanding_packets(bat_priv, NULL);
	140
	141	vis_quit(bat_priv);
	142
	143	gw_node_purge(bat_priv);
	144	originator_free(bat_priv);
	145
a73105b8	146	tt_free(bat_priv);
c6c8fea2 SE	147
	148	softif_neigh_purge(bat_priv);
	149
	150	atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
	151	}
	152
	153	void inc_module_count(void)
	154	{
	155	try_module_get(THIS_MODULE);
	156	}
	157
	158	void dec_module_count(void)
	159	{
	160	module_put(THIS_MODULE);
	161	}
	162
747e4221	163	int is_my_mac(const uint8_t *addr)
c6c8fea2	164	{
747e4221	165	const struct hard_iface *hard_iface;
c6c8fea2 SE	166
c6c8fea2 SE	167	rcu_read_lock();
e6c10f43 ML	168	list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
e6c10f43 ML	169	if (hard_iface->if_status != IF_ACTIVE)
c6c8fea2 SE	170	continue;
c6c8fea2 SE	171
e6c10f43	172	if (compare_eth(hard_iface->net_dev->dev_addr, addr)) {
c6c8fea2 SE	173	rcu_read_unlock();
	174	return 1;
	175	}
	176	}
	177	rcu_read_unlock();
	178	return 0;
c6c8fea2 SE	179	}
c6c8fea2 SE	180
1c280471 ML	181	static struct bat_algo_ops bat_algo_get(char name)
	182	{
	183	struct bat_algo_ops bat_algo_ops = NULL, bat_algo_ops_tmp;
	184	struct hlist_node *node;
	185
	186	hlist_for_each_entry(bat_algo_ops_tmp, node, &bat_algo_list, list) {
	187	if (strcmp(bat_algo_ops_tmp->name, name) != 0)
	188	continue;
	189
	190	bat_algo_ops = bat_algo_ops_tmp;
	191	break;
	192	}
	193
	194	return bat_algo_ops;
	195	}
	196
	197	int bat_algo_register(struct bat_algo_ops *bat_algo_ops)
	198	{
	199	struct bat_algo_ops *bat_algo_ops_tmp;
	200	int ret = -1;
	201
	202	bat_algo_ops_tmp = bat_algo_get(bat_algo_ops->name);
	203	if (bat_algo_ops_tmp) {
	204	pr_info("Trying to register already registered routing "
	205	"algorithm: %s\n", bat_algo_ops->name);
	206	goto out;
	207	}
	208
01c4224b ML	209	/* all algorithms must implement all ops (for now) */
	210	if (!bat_algo_ops->bat_ogm_init \|\|
	211	!bat_algo_ops->bat_ogm_init_primary \|\|
	212	!bat_algo_ops->bat_ogm_update_mac \|\|
	213	!bat_algo_ops->bat_ogm_schedule \|\|
	214	!bat_algo_ops->bat_ogm_emit \|\|
	215	!bat_algo_ops->bat_ogm_receive) {
	216	pr_info("Routing algo '%s' does not implement required ops\n",
	217	bat_algo_ops->name);
	218	goto out;
	219	}
	220
1c280471 ML	221	INIT_HLIST_NODE(&bat_algo_ops->list);
	222	hlist_add_head(&bat_algo_ops->list, &bat_algo_list);
	223	ret = 0;
	224
	225	out:
	226	return ret;
	227	}
	228
	229	int bat_algo_select(struct bat_priv bat_priv, char name)
	230	{
	231	struct bat_algo_ops *bat_algo_ops;
	232	int ret = -1;
	233
	234	bat_algo_ops = bat_algo_get(name);
	235	if (!bat_algo_ops)
	236	goto out;
	237
	238	bat_priv->bat_algo_ops = bat_algo_ops;
	239	ret = 0;
	240
	241	out:
	242	return ret;
	243	}
	244
	245	int bat_algo_seq_print_text(struct seq_file seq, void offset)
	246	{
	247	struct bat_algo_ops *bat_algo_ops;
	248	struct hlist_node *node;
	249
	250	seq_printf(seq, "Available routing algorithms:\n");
	251
	252	hlist_for_each_entry(bat_algo_ops, node, &bat_algo_list, list) {
	253	seq_printf(seq, "%s\n", bat_algo_ops->name);
	254	}
	255
	256	return 0;
	257	}
	258
d419be1f ML	259	static int param_set_ra(const char val, const struct kernel_param kp)
	260	{
	261	struct bat_algo_ops *bat_algo_ops;
	262
	263	bat_algo_ops = bat_algo_get((char *)val);
	264	if (!bat_algo_ops) {
	265	pr_err("Routing algorithm '%s' is not supported\n", val);
	266	return -EINVAL;
	267	}
	268
	269	return param_set_copystring(val, kp);
	270	}
	271
	272	static const struct kernel_param_ops param_ops_ra = {
	273	.set = param_set_ra,
	274	.get = param_get_string,
	275	};
	276
	277	static struct kparam_string __param_string_ra = {
	278	.maxlen = sizeof(bat_routing_algo),
	279	.string = bat_routing_algo,
	280	};
	281
	282	module_param_cb(routing_algo, &param_ops_ra, &__param_string_ra, 0644);
c6c8fea2 SE	283	module_init(batman_init);
	284	module_exit(batman_exit);
	285
	286	MODULE_LICENSE("GPL");
	287
	288	MODULE_AUTHOR(DRIVER_AUTHOR);
	289	MODULE_DESCRIPTION(DRIVER_DESC);
	290	MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
c6c8fea2	291	MODULE_VERSION(SOURCE_VERSION);