[deliverable/linux.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 batadv_hardif_list;
static int (*batadv_rx_handler[256])(struct sk_buff *,
				     struct hard_iface *);
char batadv_routing_algo[20] = "BATMAN_IV";
static struct hlist_head batadv_algo_list;

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

struct workqueue_struct *batadv_event_workqueue;

static void batadv_recv_handler_init(void);

static int __init batadv_init(void)
{
	INIT_LIST_HEAD(&batadv_hardif_list);
	INIT_HLIST_HEAD(&batadv_algo_list);

	batadv_recv_handler_init();

	batadv_iv_init();

	/* the name should not be longer than 10 chars - see
	 * http://lwn.net/Articles/23634/
	 */
	batadv_event_workqueue = create_singlethread_workqueue("bat_events");

	if (!batadv_event_workqueue)
		return -ENOMEM;

	batadv_socket_init();
	batadv_debugfs_init();

	register_netdevice_notifier(&batadv_hard_if_notifier);

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

	return 0;
}

static void __exit batadv_exit(void)
{
	batadv_debugfs_destroy();
	unregister_netdevice_notifier(&batadv_hard_if_notifier);
	batadv_hardif_remove_interfaces();

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

	rcu_barrier();
}

int batadv_mesh_init(struct net_device *soft_iface)
{
	struct bat_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_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);

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

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

	batadv_tt_local_add(soft_iface, soft_iface->dev_addr,
			    BATADV_NULL_IFINDEX);

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

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

	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;
}

void batadv_mesh_free(struct net_device *soft_iface)
{
	struct bat_priv *bat_priv = netdev_priv(soft_iface);

	atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);

	batadv_purge_outstanding_packets(bat_priv, NULL);

	batadv_vis_quit(bat_priv);

	batadv_gw_node_purge(bat_priv);
	batadv_originator_free(bat_priv);

	batadv_tt_free(bat_priv);

	batadv_bla_free(bat_priv);

	free_percpu(bat_priv->bat_counters);

	atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
}

void batadv_inc_module_count(void)
{
	try_module_get(THIS_MODULE);
}

void batadv_dec_module_count(void)
{
	module_put(THIS_MODULE);
}

int batadv_is_my_mac(const uint8_t *addr)
{
	const struct hard_iface *hard_iface;

	rcu_read_lock();
	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
		if (hard_iface->if_status != BATADV_IF_ACTIVE)
			continue;

		if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
			rcu_read_unlock();
			return 1;
		}
	}
	rcu_read_unlock();
	return 0;
}

static int batadv_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 batadv_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 batadv_ogm_packet *batadv_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) != BATADV_MESH_ACTIVE)
		goto err_free;

	/* discard frames on not active interfaces */
	if (hard_iface->if_status != BATADV_IF_ACTIVE)
		goto err_free;

	batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;

	if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
			   "Drop packet: incompatible batman version (%i)\n",
			   batadv_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 = batadv_ogm_packet->header.packet_type;
	ret = (*batadv_rx_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 batadv_recv_handler_init(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
		batadv_rx_handler[i] = batadv_recv_unhandled_packet;

	/* batman icmp packet */
	batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
	/* unicast packet */
	batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
	/* fragmented unicast packet */
	batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
	/* broadcast packet */
	batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
	/* vis packet */
	batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet;
	/* Translation table query (request or response) */
	batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query;
	/* Roaming advertisement */
	batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv;
}

int batadv_recv_handler_register(uint8_t packet_type,
				 int (*recv_handler)(struct sk_buff *,
						     struct hard_iface *))
{
	if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet)
		return -EBUSY;

	batadv_rx_handler[packet_type] = recv_handler;
	return 0;
}

void batadv_recv_handler_unregister(uint8_t packet_type)
{
	batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
}

static struct bat_algo_ops *batadv_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, &batadv_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 batadv_algo_register(struct bat_algo_ops *bat_algo_ops)
{
	struct bat_algo_ops *bat_algo_ops_tmp;
	int ret;

	bat_algo_ops_tmp = batadv_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);
		ret = -EEXIST;
		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);
		ret = -EINVAL;
		goto out;
	}

	INIT_HLIST_NODE(&bat_algo_ops->list);
	hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
	ret = 0;

out:
	return ret;
}

int batadv_algo_select(struct bat_priv *bat_priv, char *name)
{
	struct bat_algo_ops *bat_algo_ops;
	int ret = -EINVAL;

	bat_algo_ops = batadv_algo_get(name);
	if (!bat_algo_ops)
		goto out;

	bat_priv->bat_algo_ops = bat_algo_ops;
	ret = 0;

out:
	return ret;
}

int batadv_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, &batadv_algo_list, list) {
		seq_printf(seq, "%s\n", bat_algo_ops->name);
	}

	return 0;
}

static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
{
	struct bat_algo_ops *bat_algo_ops;
	char *algo_name = (char *)val;
	size_t name_len = strlen(algo_name);

	if (algo_name[name_len - 1] == '\n')
		algo_name[name_len - 1] = '\0';

	bat_algo_ops = batadv_algo_get(algo_name);
	if (!bat_algo_ops) {
		pr_err("Routing algorithm '%s' is not supported\n", algo_name);
		return -EINVAL;
	}

	return param_set_copystring(algo_name, kp);
}

static const struct kernel_param_ops batadv_param_ops_ra = {
	.set = batadv_param_set_ra,
	.get = param_get_string,
};

static struct kparam_string batadv_param_string_ra = {
	.maxlen = sizeof(batadv_routing_algo),
	.string = batadv_routing_algo,
};

module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
		0644);
module_init(batadv_init);
module_exit(batadv_exit);

MODULE_LICENSE("GPL");

MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
MODULE_VERSION(BATADV_SOURCE_VERSION);
Commit	Line	Data
	1	/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
	2	*
	3	* Marek Lindner, Simon Wunderlich
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of version 2 of the GNU General Public
	7	* License as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	* General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	17	* 02110-1301, USA
	18	*/
	19
	20	#include "main.h"
	21	#include "bat_sysfs.h"
	22	#include "bat_debugfs.h"
	23	#include "routing.h"
	24	#include "send.h"
	25	#include "originator.h"
	26	#include "soft-interface.h"
	27	#include "icmp_socket.h"
	28	#include "translation-table.h"
	29	#include "hard-interface.h"
	30	#include "gateway_client.h"
	31	#include "bridge_loop_avoidance.h"
	32	#include "vis.h"
	33	#include "hash.h"
	34	#include "bat_algo.h"
	35
	36
	37	/* List manipulations on hardif_list have to be rtnl_lock()'ed,
	38	* list traversals just rcu-locked
	39	*/
	40	struct list_head batadv_hardif_list;
	41	static int (batadv_rx_handler[256])(struct sk_buff ,
	42	struct hard_iface *);
	43	char batadv_routing_algo[20] = "BATMAN_IV";
	44	static struct hlist_head batadv_algo_list;
	45
	46	unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
	47
	48	struct workqueue_struct *batadv_event_workqueue;
	49
	50	static void batadv_recv_handler_init(void);
	51
	52	static int __init batadv_init(void)
	53	{
	54	INIT_LIST_HEAD(&batadv_hardif_list);
	55	INIT_HLIST_HEAD(&batadv_algo_list);
	56
	57	batadv_recv_handler_init();
	58
	59	batadv_iv_init();
	60
	61	/* the name should not be longer than 10 chars - see
	62	* http://lwn.net/Articles/23634/
	63	*/
	64	batadv_event_workqueue = create_singlethread_workqueue("bat_events");
	65
	66	if (!batadv_event_workqueue)
	67	return -ENOMEM;
	68
	69	batadv_socket_init();
	70	batadv_debugfs_init();
	71
	72	register_netdevice_notifier(&batadv_hard_if_notifier);
	73
	74	pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
	75	BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
	76
	77	return 0;
	78	}
	79
	80	static void __exit batadv_exit(void)
	81	{
	82	batadv_debugfs_destroy();
	83	unregister_netdevice_notifier(&batadv_hard_if_notifier);
	84	batadv_hardif_remove_interfaces();
	85
	86	flush_workqueue(batadv_event_workqueue);
	87	destroy_workqueue(batadv_event_workqueue);
	88	batadv_event_workqueue = NULL;
	89
	90	rcu_barrier();
	91	}
	92
	93	int batadv_mesh_init(struct net_device *soft_iface)
	94	{
	95	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	96	int ret;
	97
	98	spin_lock_init(&bat_priv->forw_bat_list_lock);
	99	spin_lock_init(&bat_priv->forw_bcast_list_lock);
	100	spin_lock_init(&bat_priv->tt_changes_list_lock);
	101	spin_lock_init(&bat_priv->tt_req_list_lock);
	102	spin_lock_init(&bat_priv->tt_roam_list_lock);
	103	spin_lock_init(&bat_priv->tt_buff_lock);
	104	spin_lock_init(&bat_priv->gw_list_lock);
	105	spin_lock_init(&bat_priv->vis_hash_lock);
	106	spin_lock_init(&bat_priv->vis_list_lock);
	107
	108	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
	109	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
	110	INIT_HLIST_HEAD(&bat_priv->gw_list);
	111	INIT_LIST_HEAD(&bat_priv->tt_changes_list);
	112	INIT_LIST_HEAD(&bat_priv->tt_req_list);
	113	INIT_LIST_HEAD(&bat_priv->tt_roam_list);
	114
	115	ret = batadv_originator_init(bat_priv);
	116	if (ret < 0)
	117	goto err;
	118
	119	ret = batadv_tt_init(bat_priv);
	120	if (ret < 0)
	121	goto err;
	122
	123	batadv_tt_local_add(soft_iface, soft_iface->dev_addr,
	124	BATADV_NULL_IFINDEX);
	125
	126	ret = batadv_vis_init(bat_priv);
	127	if (ret < 0)
	128	goto err;
	129
	130	ret = batadv_bla_init(bat_priv);
	131	if (ret < 0)
	132	goto err;
	133
	134	atomic_set(&bat_priv->gw_reselect, 0);
	135	atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);
	136
	137	return 0;
	138
	139	err:
	140	batadv_mesh_free(soft_iface);
	141	return ret;
	142	}
	143
	144	void batadv_mesh_free(struct net_device *soft_iface)
	145	{
	146	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	147
	148	atomic_set(&bat_priv->mesh_state, BATADV_MESH_DEACTIVATING);
	149
	150	batadv_purge_outstanding_packets(bat_priv, NULL);
	151
	152	batadv_vis_quit(bat_priv);
	153
	154	batadv_gw_node_purge(bat_priv);
	155	batadv_originator_free(bat_priv);
	156
	157	batadv_tt_free(bat_priv);
	158
	159	batadv_bla_free(bat_priv);
	160
	161	free_percpu(bat_priv->bat_counters);
	162
	163	atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
	164	}
	165
	166	void batadv_inc_module_count(void)
	167	{
	168	try_module_get(THIS_MODULE);
	169	}
	170
	171	void batadv_dec_module_count(void)
	172	{
	173	module_put(THIS_MODULE);
	174	}
	175
	176	int batadv_is_my_mac(const uint8_t *addr)
	177	{
	178	const struct hard_iface *hard_iface;
	179
	180	rcu_read_lock();
	181	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
	182	if (hard_iface->if_status != BATADV_IF_ACTIVE)
	183	continue;
	184
	185	if (batadv_compare_eth(hard_iface->net_dev->dev_addr, addr)) {
	186	rcu_read_unlock();
	187	return 1;
	188	}
	189	}
	190	rcu_read_unlock();
	191	return 0;
	192	}
	193
	194	static int batadv_recv_unhandled_packet(struct sk_buff *skb,
	195	struct hard_iface *recv_if)
	196	{
	197	return NET_RX_DROP;
	198	}
	199
	200	/* incoming packets with the batman ethertype received on any active hard
	201	* interface
	202	*/
	203	int batadv_batman_skb_recv(struct sk_buff skb, struct net_device dev,
	204	struct packet_type *ptype,
	205	struct net_device *orig_dev)
	206	{
	207	struct bat_priv *bat_priv;
	208	struct batadv_ogm_packet *batadv_ogm_packet;
	209	struct hard_iface *hard_iface;
	210	uint8_t idx;
	211	int ret;
	212
	213	hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
	214	skb = skb_share_check(skb, GFP_ATOMIC);
	215
	216	/* skb was released by skb_share_check() */
	217	if (!skb)
	218	goto err_out;
	219
	220	/* packet should hold at least type and version */
	221	if (unlikely(!pskb_may_pull(skb, 2)))
	222	goto err_free;
	223
	224	/* expect a valid ethernet header here. */
	225	if (unlikely(skb->mac_len != ETH_HLEN \|\| !skb_mac_header(skb)))
	226	goto err_free;
	227
	228	if (!hard_iface->soft_iface)
	229	goto err_free;
	230
	231	bat_priv = netdev_priv(hard_iface->soft_iface);
	232
	233	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
	234	goto err_free;
	235
	236	/* discard frames on not active interfaces */
	237	if (hard_iface->if_status != BATADV_IF_ACTIVE)
	238	goto err_free;
	239
	240	batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
	241
	242	if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
	243	batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
	244	"Drop packet: incompatible batman version (%i)\n",
	245	batadv_ogm_packet->header.version);
	246	goto err_free;
	247	}
	248
	249	/* all receive handlers return whether they received or reused
	250	* the supplied skb. if not, we have to free the skb.
	251	*/
	252	idx = batadv_ogm_packet->header.packet_type;
	253	ret = (*batadv_rx_handler[idx])(skb, hard_iface);
	254
	255	if (ret == NET_RX_DROP)
	256	kfree_skb(skb);
	257
	258	/* return NET_RX_SUCCESS in any case as we
	259	* most probably dropped the packet for
	260	* routing-logical reasons.
	261	*/
	262	return NET_RX_SUCCESS;
	263
	264	err_free:
	265	kfree_skb(skb);
	266	err_out:
	267	return NET_RX_DROP;
	268	}
	269
	270	static void batadv_recv_handler_init(void)
	271	{
	272	int i;
	273
	274	for (i = 0; i < ARRAY_SIZE(batadv_rx_handler); i++)
	275	batadv_rx_handler[i] = batadv_recv_unhandled_packet;
	276
	277	/* batman icmp packet */
	278	batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet;
	279	/* unicast packet */
	280	batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet;
	281	/* fragmented unicast packet */
	282	batadv_rx_handler[BATADV_UNICAST_FRAG] = batadv_recv_ucast_frag_packet;
	283	/* broadcast packet */
	284	batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
	285	/* vis packet */
	286	batadv_rx_handler[BATADV_VIS] = batadv_recv_vis_packet;
	287	/* Translation table query (request or response) */
	288	batadv_rx_handler[BATADV_TT_QUERY] = batadv_recv_tt_query;
	289	/* Roaming advertisement */
	290	batadv_rx_handler[BATADV_ROAM_ADV] = batadv_recv_roam_adv;
	291	}
	292
	293	int batadv_recv_handler_register(uint8_t packet_type,
	294	int (recv_handler)(struct sk_buff ,
	295	struct hard_iface *))
	296	{
	297	if (batadv_rx_handler[packet_type] != &batadv_recv_unhandled_packet)
	298	return -EBUSY;
	299
	300	batadv_rx_handler[packet_type] = recv_handler;
	301	return 0;
	302	}
	303
	304	void batadv_recv_handler_unregister(uint8_t packet_type)
	305	{
	306	batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
	307	}
	308
	309	static struct bat_algo_ops batadv_algo_get(char name)
	310	{
	311	struct bat_algo_ops bat_algo_ops = NULL, bat_algo_ops_tmp;
	312	struct hlist_node *node;
	313
	314	hlist_for_each_entry(bat_algo_ops_tmp, node, &batadv_algo_list, list) {
	315	if (strcmp(bat_algo_ops_tmp->name, name) != 0)
	316	continue;
	317
	318	bat_algo_ops = bat_algo_ops_tmp;
	319	break;
	320	}
	321
	322	return bat_algo_ops;
	323	}
	324
	325	int batadv_algo_register(struct bat_algo_ops *bat_algo_ops)
	326	{
	327	struct bat_algo_ops *bat_algo_ops_tmp;
	328	int ret;
	329
	330	bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
	331	if (bat_algo_ops_tmp) {
	332	pr_info("Trying to register already registered routing algorithm: %s\n",
	333	bat_algo_ops->name);
	334	ret = -EEXIST;
	335	goto out;
	336	}
	337
	338	/* all algorithms must implement all ops (for now) */
	339	if (!bat_algo_ops->bat_iface_enable \|\|
	340	!bat_algo_ops->bat_iface_disable \|\|
	341	!bat_algo_ops->bat_iface_update_mac \|\|
	342	!bat_algo_ops->bat_primary_iface_set \|\|
	343	!bat_algo_ops->bat_ogm_schedule \|\|
	344	!bat_algo_ops->bat_ogm_emit) {
	345	pr_info("Routing algo '%s' does not implement required ops\n",
	346	bat_algo_ops->name);
	347	ret = -EINVAL;
	348	goto out;
	349	}
	350
	351	INIT_HLIST_NODE(&bat_algo_ops->list);
	352	hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
	353	ret = 0;
	354
	355	out:
	356	return ret;
	357	}
	358
	359	int batadv_algo_select(struct bat_priv bat_priv, char name)
	360	{
	361	struct bat_algo_ops *bat_algo_ops;
	362	int ret = -EINVAL;
	363
	364	bat_algo_ops = batadv_algo_get(name);
	365	if (!bat_algo_ops)
	366	goto out;
	367
	368	bat_priv->bat_algo_ops = bat_algo_ops;
	369	ret = 0;
	370
	371	out:
	372	return ret;
	373	}
	374
	375	int batadv_algo_seq_print_text(struct seq_file seq, void offset)
	376	{
	377	struct bat_algo_ops *bat_algo_ops;
	378	struct hlist_node *node;
	379
	380	seq_printf(seq, "Available routing algorithms:\n");
	381
	382	hlist_for_each_entry(bat_algo_ops, node, &batadv_algo_list, list) {
	383	seq_printf(seq, "%s\n", bat_algo_ops->name);
	384	}
	385
	386	return 0;
	387	}
	388
	389	static int batadv_param_set_ra(const char val, const struct kernel_param kp)
	390	{
	391	struct bat_algo_ops *bat_algo_ops;
	392	char algo_name = (char )val;
	393	size_t name_len = strlen(algo_name);
	394
	395	if (algo_name[name_len - 1] == '\n')
	396	algo_name[name_len - 1] = '\0';
	397
	398	bat_algo_ops = batadv_algo_get(algo_name);
	399	if (!bat_algo_ops) {
	400	pr_err("Routing algorithm '%s' is not supported\n", algo_name);
	401	return -EINVAL;
	402	}
	403
	404	return param_set_copystring(algo_name, kp);
	405	}
	406
	407	static const struct kernel_param_ops batadv_param_ops_ra = {
	408	.set = batadv_param_set_ra,
	409	.get = param_get_string,
	410	};
	411
	412	static struct kparam_string batadv_param_string_ra = {
	413	.maxlen = sizeof(batadv_routing_algo),
	414	.string = batadv_routing_algo,
	415	};
	416
	417	module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
	418	0644);
	419	module_init(batadv_init);
	420	module_exit(batadv_exit);
	421
	422	MODULE_LICENSE("GPL");
	423
	424	MODULE_AUTHOR(BATADV_DRIVER_AUTHOR);
	425	MODULE_DESCRIPTION(BATADV_DRIVER_DESC);
	426	MODULE_SUPPORTED_DEVICE(BATADV_DRIVER_DEVICE);
	427	MODULE_VERSION(BATADV_SOURCE_VERSION);