[mirror_ubuntu-bionic-kernel.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;
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();

	batadv_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);
	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 = originator_init(bat_priv);
	if (ret < 0)
		goto err;

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

	tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX);

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

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

	atomic_set(&bat_priv->gw_reselect, 0);
	atomic_set(&bat_priv->mesh_state, MESH_ACTIVE);

	return 0;

err:
	mesh_free(soft_iface);
	return ret;
}

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);

	free_percpu(bat_priv->bat_counters);

	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;

	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);
		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, &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 = -EINVAL;

	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;
	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 = bat_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 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;
ffa995e0	42	static int (recv_packet_handler[256])(struct sk_buff , struct hard_iface *);
519d3497	43	char bat_routing_algo[20] = "BATMAN_IV";
1c280471	44	static struct hlist_head bat_algo_list;
c6c8fea2 SE	45
	46	unsigned char broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
	47
	48	struct workqueue_struct *bat_event_workqueue;
	49
ffa995e0 ML	50	static void recv_handler_init(void);
ffa995e0 ML	51
c6c8fea2 SE	52	static int __init batman_init(void)
c6c8fea2 SE	53	{
4389e47a	54	INIT_LIST_HEAD(&hardif_list);
1c280471 ML	55	INIT_HLIST_HEAD(&bat_algo_list);
1c280471 ML	56
ffa995e0 ML	57	recv_handler_init();
ffa995e0 ML	58
81c524f7	59	batadv_iv_init();
c6c8fea2 SE	60
	61	/* the name should not be longer than 10 chars - see
	62	* http://lwn.net/Articles/23634/ */
	63	bat_event_workqueue = create_singlethread_workqueue("bat_events");
	64
	65	if (!bat_event_workqueue)
	66	return -ENOMEM;
	67
	68	bat_socket_init();
	69	debugfs_init();
	70
	71	register_netdevice_notifier(&hard_if_notifier);
	72
86ceb360 SE	73	pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
86ceb360 SE	74	SOURCE_VERSION, COMPAT_VERSION);
c6c8fea2 SE	75
	76	return 0;
	77	}
	78
	79	static void __exit batman_exit(void)
	80	{
	81	debugfs_destroy();
	82	unregister_netdevice_notifier(&hard_if_notifier);
	83	hardif_remove_interfaces();
	84
	85	flush_workqueue(bat_event_workqueue);
	86	destroy_workqueue(bat_event_workqueue);
	87	bat_event_workqueue = NULL;
	88
	89	rcu_barrier();
	90	}
	91
	92	int mesh_init(struct net_device *soft_iface)
	93	{
	94	struct bat_priv *bat_priv = netdev_priv(soft_iface);
5346c35e	95	int ret;
c6c8fea2	96
c6c8fea2 SE	97	spin_lock_init(&bat_priv->forw_bat_list_lock);
c6c8fea2 SE	98	spin_lock_init(&bat_priv->forw_bcast_list_lock);
a73105b8 AQ	99	spin_lock_init(&bat_priv->tt_changes_list_lock);
a73105b8 AQ	100	spin_lock_init(&bat_priv->tt_req_list_lock);
cc47f66e	101	spin_lock_init(&bat_priv->tt_roam_list_lock);
a73105b8	102	spin_lock_init(&bat_priv->tt_buff_lock);
c6c8fea2 SE	103	spin_lock_init(&bat_priv->gw_list_lock);
	104	spin_lock_init(&bat_priv->vis_hash_lock);
	105	spin_lock_init(&bat_priv->vis_list_lock);
c6c8fea2 SE	106
	107	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
	108	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
	109	INIT_HLIST_HEAD(&bat_priv->gw_list);
a73105b8 AQ	110	INIT_LIST_HEAD(&bat_priv->tt_changes_list);
a73105b8 AQ	111	INIT_LIST_HEAD(&bat_priv->tt_req_list);
cc47f66e	112	INIT_LIST_HEAD(&bat_priv->tt_roam_list);
c6c8fea2	113
5346c35e SE	114	ret = originator_init(bat_priv);
5346c35e SE	115	if (ret < 0)
c6c8fea2 SE	116	goto err;
c6c8fea2 SE	117
5346c35e SE	118	ret = tt_init(bat_priv);
5346c35e SE	119	if (ret < 0)
c6c8fea2 SE	120	goto err;
c6c8fea2 SE	121
bc279080	122	tt_local_add(soft_iface, soft_iface->dev_addr, NULL_IFINDEX);
c6c8fea2	123
5346c35e SE	124	ret = vis_init(bat_priv);
5346c35e SE	125	if (ret < 0)
c6c8fea2 SE	126	goto err;
c6c8fea2 SE	127
5346c35e SE	128	ret = bla_init(bat_priv);
5346c35e SE	129	if (ret < 0)
23721387 SW	130	goto err;
23721387 SW	131
2265c141	132	atomic_set(&bat_priv->gw_reselect, 0);
c6c8fea2	133	atomic_set(&bat_priv->mesh_state, MESH_ACTIVE);
5346c35e SE	134
5346c35e SE	135	return 0;
c6c8fea2 SE	136
c6c8fea2 SE	137	err:
c6c8fea2	138	mesh_free(soft_iface);
5346c35e	139	return ret;
c6c8fea2 SE	140	}
	141
	142	void mesh_free(struct net_device *soft_iface)
	143	{
	144	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	145
	146	atomic_set(&bat_priv->mesh_state, MESH_DEACTIVATING);
	147
	148	purge_outstanding_packets(bat_priv, NULL);
	149
	150	vis_quit(bat_priv);
	151
	152	gw_node_purge(bat_priv);
	153	originator_free(bat_priv);
	154
a73105b8	155	tt_free(bat_priv);
c6c8fea2	156
23721387 SW	157	bla_free(bat_priv);
23721387 SW	158
f8214865 MH	159	free_percpu(bat_priv->bat_counters);
f8214865 MH	160
c6c8fea2 SE	161	atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
	162	}
	163
	164	void inc_module_count(void)
	165	{
	166	try_module_get(THIS_MODULE);
	167	}
	168
	169	void dec_module_count(void)
	170	{
	171	module_put(THIS_MODULE);
	172	}
	173
747e4221	174	int is_my_mac(const uint8_t *addr)
c6c8fea2	175	{
747e4221	176	const struct hard_iface *hard_iface;
c6c8fea2 SE	177
c6c8fea2 SE	178	rcu_read_lock();
e6c10f43 ML	179	list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
e6c10f43 ML	180	if (hard_iface->if_status != IF_ACTIVE)
c6c8fea2 SE	181	continue;
c6c8fea2 SE	182
e6c10f43	183	if (compare_eth(hard_iface->net_dev->dev_addr, addr)) {
c6c8fea2 SE	184	rcu_read_unlock();
	185	return 1;
	186	}
	187	}
	188	rcu_read_unlock();
	189	return 0;
c6c8fea2 SE	190	}
c6c8fea2 SE	191
ffa995e0 ML	192	static int recv_unhandled_packet(struct sk_buff *skb,
	193	struct hard_iface *recv_if)
	194	{
	195	return NET_RX_DROP;
	196	}
	197
	198	/* incoming packets with the batman ethertype received on any active hard
	199	* interface
	200	*/
	201	int batman_skb_recv(struct sk_buff skb, struct net_device dev,
	202	struct packet_type ptype, struct net_device orig_dev)
	203	{
	204	struct bat_priv *bat_priv;
	205	struct batman_ogm_packet *batman_ogm_packet;
	206	struct hard_iface *hard_iface;
	207	uint8_t idx;
	208	int ret;
	209
	210	hard_iface = container_of(ptype, struct hard_iface, batman_adv_ptype);
	211	skb = skb_share_check(skb, GFP_ATOMIC);
	212
	213	/* skb was released by skb_share_check() */
	214	if (!skb)
	215	goto err_out;
	216
	217	/* packet should hold at least type and version */
	218	if (unlikely(!pskb_may_pull(skb, 2)))
	219	goto err_free;
	220
	221	/* expect a valid ethernet header here. */
	222	if (unlikely(skb->mac_len != ETH_HLEN \|\| !skb_mac_header(skb)))
	223	goto err_free;
	224
	225	if (!hard_iface->soft_iface)
	226	goto err_free;
	227
	228	bat_priv = netdev_priv(hard_iface->soft_iface);
	229
	230	if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
	231	goto err_free;
	232
	233	/* discard frames on not active interfaces */
	234	if (hard_iface->if_status != IF_ACTIVE)
	235	goto err_free;
	236
	237	batman_ogm_packet = (struct batman_ogm_packet *)skb->data;
	238
	239	if (batman_ogm_packet->header.version != COMPAT_VERSION) {
	240	bat_dbg(DBG_BATMAN, bat_priv,
	241	"Drop packet: incompatible batman version (%i)\n",
	242	batman_ogm_packet->header.version);
	243	goto err_free;
	244	}
	245
	246	/* all receive handlers return whether they received or reused
	247	* the supplied skb. if not, we have to free the skb.
	248	*/
	249	idx = batman_ogm_packet->header.packet_type;
	250	ret = (*recv_packet_handler[idx])(skb, hard_iface);
	251
	252	if (ret == NET_RX_DROP)
	253	kfree_skb(skb);
	254
	255	/* return NET_RX_SUCCESS in any case as we
256	* most probably dropped the packet for
257	* routing-logical reasons.
258	*/
259	return NET_RX_SUCCESS;
260
261	err_free:
262	kfree_skb(skb);
263	err_out:
264	return NET_RX_DROP;
265	}
266
267	static void recv_handler_init(void)
268	{
269	int i;
270
271	for (i = 0; i < ARRAY_SIZE(recv_packet_handler); i++)
272	recv_packet_handler[i] = recv_unhandled_packet;
273
ffa995e0 ML	274	/* batman icmp packet */
	275	recv_packet_handler[BAT_ICMP] = recv_icmp_packet;
	276	/* unicast packet */
	277	recv_packet_handler[BAT_UNICAST] = recv_unicast_packet;
	278	/* fragmented unicast packet */
	279	recv_packet_handler[BAT_UNICAST_FRAG] = recv_ucast_frag_packet;
	280	/* broadcast packet */
	281	recv_packet_handler[BAT_BCAST] = recv_bcast_packet;
	282	/* vis packet */
	283	recv_packet_handler[BAT_VIS] = recv_vis_packet;
	284	/* Translation table query (request or response) */
	285	recv_packet_handler[BAT_TT_QUERY] = recv_tt_query;
	286	/* Roaming advertisement */
	287	recv_packet_handler[BAT_ROAM_ADV] = recv_roam_adv;
	288	}
	289
	290	int recv_handler_register(uint8_t packet_type,
	291	int (recv_handler)(struct sk_buff ,
	292	struct hard_iface *))
	293	{
	294	if (recv_packet_handler[packet_type] != &recv_unhandled_packet)
	295	return -EBUSY;
	296
	297	recv_packet_handler[packet_type] = recv_handler;
	298	return 0;
	299	}
	300
	301	void recv_handler_unregister(uint8_t packet_type)
	302	{
	303	recv_packet_handler[packet_type] = recv_unhandled_packet;
	304	}
	305
1c280471 ML	306	static struct bat_algo_ops bat_algo_get(char name)
	307	{
	308	struct bat_algo_ops bat_algo_ops = NULL, bat_algo_ops_tmp;
	309	struct hlist_node *node;
	310
	311	hlist_for_each_entry(bat_algo_ops_tmp, node, &bat_algo_list, list) {
	312	if (strcmp(bat_algo_ops_tmp->name, name) != 0)
	313	continue;
	314
	315	bat_algo_ops = bat_algo_ops_tmp;
	316	break;
	317	}
	318
	319	return bat_algo_ops;
	320	}
	321
	322	int bat_algo_register(struct bat_algo_ops *bat_algo_ops)
	323	{
	324	struct bat_algo_ops *bat_algo_ops_tmp;
5346c35e	325	int ret;
1c280471 ML	326
	327	bat_algo_ops_tmp = bat_algo_get(bat_algo_ops->name);
	328	if (bat_algo_ops_tmp) {
86ceb360 SE	329	pr_info("Trying to register already registered routing algorithm: %s\n",
86ceb360 SE	330	bat_algo_ops->name);
5346c35e	331	ret = -EEXIST;
1c280471 ML	332	goto out;
	333	}
	334
01c4224b	335	/* all algorithms must implement all ops (for now) */
c2aca022	336	if (!bat_algo_ops->bat_iface_enable \|\|
00a50076	337	!bat_algo_ops->bat_iface_disable \|\|
c3229398	338	!bat_algo_ops->bat_iface_update_mac \|\|
cd8b78e7	339	!bat_algo_ops->bat_primary_iface_set \|\|
01c4224b	340	!bat_algo_ops->bat_ogm_schedule \|\|
c3e29312	341	!bat_algo_ops->bat_ogm_emit) {
01c4224b ML	342	pr_info("Routing algo '%s' does not implement required ops\n",
01c4224b ML	343	bat_algo_ops->name);
5346c35e	344	ret = -EINVAL;
01c4224b ML	345	goto out;
	346	}
	347
1c280471 ML	348	INIT_HLIST_NODE(&bat_algo_ops->list);
	349	hlist_add_head(&bat_algo_ops->list, &bat_algo_list);
	350	ret = 0;
	351
	352	out:
	353	return ret;
	354	}
	355
	356	int bat_algo_select(struct bat_priv bat_priv, char name)
	357	{
	358	struct bat_algo_ops *bat_algo_ops;
5346c35e	359	int ret = -EINVAL;
1c280471 ML	360
	361	bat_algo_ops = bat_algo_get(name);
	362	if (!bat_algo_ops)
	363	goto out;
	364
	365	bat_priv->bat_algo_ops = bat_algo_ops;
	366	ret = 0;
	367
	368	out:
	369	return ret;
	370	}
	371
	372	int bat_algo_seq_print_text(struct seq_file seq, void offset)
	373	{
	374	struct bat_algo_ops *bat_algo_ops;
	375	struct hlist_node *node;
	376
	377	seq_printf(seq, "Available routing algorithms:\n");
	378
	379	hlist_for_each_entry(bat_algo_ops, node, &bat_algo_list, list) {
	380	seq_printf(seq, "%s\n", bat_algo_ops->name);
	381	}
	382
	383	return 0;
	384	}
	385
d419be1f ML	386	static int param_set_ra(const char val, const struct kernel_param kp)
	387	{
	388	struct bat_algo_ops *bat_algo_ops;
d8cb5486 ML	389	char algo_name = (char )val;
d8cb5486 ML	390	size_t name_len = strlen(algo_name);
d419be1f	391
d8cb5486 ML	392	if (algo_name[name_len - 1] == '\n')
	393	algo_name[name_len - 1] = '\0';
	394
	395	bat_algo_ops = bat_algo_get(algo_name);
d419be1f	396	if (!bat_algo_ops) {
d8cb5486	397	pr_err("Routing algorithm '%s' is not supported\n", algo_name);
d419be1f ML	398	return -EINVAL;
	399	}
	400
d8cb5486	401	return param_set_copystring(algo_name, kp);
d419be1f ML	402	}
	403
	404	static const struct kernel_param_ops param_ops_ra = {
	405	.set = param_set_ra,
	406	.get = param_get_string,
	407	};
	408
	409	static struct kparam_string __param_string_ra = {
	410	.maxlen = sizeof(bat_routing_algo),
	411	.string = bat_routing_algo,
	412	};
	413
	414	module_param_cb(routing_algo, &param_ops_ra, &__param_string_ra, 0644);
c6c8fea2 SE	415	module_init(batman_init);
	416	module_exit(batman_exit);
	417
	418	MODULE_LICENSE("GPL");
	419
	420	MODULE_AUTHOR(DRIVER_AUTHOR);
	421	MODULE_DESCRIPTION(DRIVER_DESC);
	422	MODULE_SUPPORTED_DEVICE(DRIVER_DEVICE);
c6c8fea2	423	MODULE_VERSION(SOURCE_VERSION);