[net-next-2.6.git] / drivers / staging / batman-adv / hard-interface.c

/*
 * Copyright (C) 2007-2009 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 "hard-interface.h"
#include "soft-interface.h"
#include "send.h"
#include "translation-table.h"
#include "routing.h"
#include "hash.h"

#define MIN(x, y) ((x) < (y) ? (x) : (y))

static char avail_ifs;
static char active_ifs;

static void hardif_free_interface(struct rcu_head *rcu);

static struct batman_if *get_batman_if_by_name(char *name)
{
	struct batman_if *batman_if;

	rcu_read_lock();
	list_for_each_entry_rcu(batman_if, &if_list, list) {
		if (strncmp(batman_if->dev, name, IFNAMSIZ) == 0)
			goto out;
	}

	batman_if = NULL;

out:
	rcu_read_unlock();
	return batman_if;
}

int hardif_min_mtu(void)
{
	struct batman_if *batman_if;
	/* allow big frames if all devices are capable to do so
	 * (have MTU > 1500 + BAT_HEADER_LEN) */
	int min_mtu = ETH_DATA_LEN;

	rcu_read_lock();
	list_for_each_entry_rcu(batman_if, &if_list, list) {
		if ((batman_if->if_active == IF_ACTIVE) ||
		    (batman_if->if_active == IF_TO_BE_ACTIVATED))
			min_mtu = MIN(batman_if->net_dev->mtu - BAT_HEADER_LEN,
				      min_mtu);
	}
	rcu_read_unlock();

	return min_mtu;
}

static void check_known_mac_addr(uint8_t *addr)
{
	struct batman_if *batman_if;

	rcu_read_lock();
	list_for_each_entry_rcu(batman_if, &if_list, list) {
		if ((batman_if->if_active != IF_ACTIVE) &&
		    (batman_if->if_active != IF_TO_BE_ACTIVATED))
			continue;

		if (!compare_orig(batman_if->net_dev->dev_addr, addr))
			continue;

		printk(KERN_WARNING "batman-adv:The newly added mac address (%pM) already exists on: %s\n",
		       addr, batman_if->dev);
		printk(KERN_WARNING "batman-adv:It is strongly recommended to keep mac addresses unique to avoid problems!\n");
	}
	rcu_read_unlock();
}

/* adjusts the MTU if a new interface with a smaller MTU appeared. */
void update_min_mtu(void)
{
	int min_mtu;

	min_mtu = hardif_min_mtu();
	if (soft_device->mtu != min_mtu)
		soft_device->mtu = min_mtu;
}

/* checks if the interface is up. (returns 1 if it is) */
static int hardif_is_interface_up(char *dev)
{
	struct net_device *net_dev;

	/**
	 * if we already have an interface in our interface list and
	 * the current interface is not the primary interface and
	 * the primary interface is not up and
	 * the primary interface has never been up - don't activate any
	 * secondary interface !
	 */

	rcu_read_lock();
	if ((!list_empty(&if_list)) &&
	    strncmp(((struct batman_if *)if_list.next)->dev, dev, IFNAMSIZ) &&
	    !(((struct batman_if *)if_list.next)->if_active == IF_ACTIVE) &&
	    !(((struct batman_if *)if_list.next)->if_active == IF_TO_BE_ACTIVATED) &&
	    (!main_if_was_up())) {
		rcu_read_unlock();
		goto end;
	}
	rcu_read_unlock();

#ifdef __NET_NET_NAMESPACE_H
	net_dev = dev_get_by_name(&init_net, dev);
#else
	net_dev = dev_get_by_name(dev);
#endif
	if (!net_dev)
		goto end;

	if (!(net_dev->flags & IFF_UP))
		goto failure;

	dev_put(net_dev);
	return 1;

failure:
	dev_put(net_dev);
end:
	return 0;
}

/* deactivates the interface. */
void hardif_deactivate_interface(struct batman_if *batman_if)
{
	if (batman_if->if_active != IF_ACTIVE)
		return;

	/**
	 * batman_if->net_dev has been acquired by dev_get_by_name() in
	 * proc_interfaces_write() and has to be unreferenced.
	 */

	if (batman_if->net_dev)
		dev_put(batman_if->net_dev);

	batman_if->if_active = IF_INACTIVE;
	active_ifs--;

	printk(KERN_INFO "batman-adv:Interface deactivated: %s\n",
		  batman_if->dev);
}

/* (re)activate given interface. */
static void hardif_activate_interface(struct batman_if *batman_if)
{
	if (batman_if->if_active != IF_INACTIVE)
		return;

#ifdef __NET_NET_NAMESPACE_H
	batman_if->net_dev = dev_get_by_name(&init_net, batman_if->dev);
#else
	batman_if->net_dev = dev_get_by_name(batman_if->dev);
#endif
	if (!batman_if->net_dev)
		goto dev_err;

	check_known_mac_addr(batman_if->net_dev->dev_addr);

	addr_to_string(batman_if->addr_str, batman_if->net_dev->dev_addr);

	memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
	       batman_if->net_dev->dev_addr, ETH_ALEN);
	memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender,
	       batman_if->net_dev->dev_addr, ETH_ALEN);

	batman_if->if_active = IF_TO_BE_ACTIVATED;
	active_ifs++;

	/* save the mac address if it is our primary interface */
	if (batman_if->if_num == 0)
		set_main_if_addr(batman_if->net_dev->dev_addr);

	printk(KERN_INFO "batman-adv:Interface activated: %s\n",
		  batman_if->dev);

	return;

dev_err:
	batman_if->net_dev = NULL;
}

static void hardif_free_interface(struct rcu_head *rcu)
{
	struct batman_if *batman_if = container_of(rcu, struct batman_if, rcu);

	kfree(batman_if->packet_buff);
	kfree(batman_if->dev);
	kfree(batman_if);
}

/**
 * called by
 *  - echo '' > /proc/.../interfaces
 *  - modprobe -r batman-adv-core
 */
/* removes and frees all interfaces */
void hardif_remove_interfaces(void)
{
	struct batman_if *batman_if = NULL;

	avail_ifs = 0;

	/* no lock needed - we don't delete somewhere else */
	list_for_each_entry(batman_if, &if_list, list) {

		list_del_rcu(&batman_if->list);

		/* first deactivate interface */
		if (batman_if->if_active != IF_INACTIVE)
			hardif_deactivate_interface(batman_if);

		call_rcu(&batman_if->rcu, hardif_free_interface);
	}
}

static int resize_orig(struct orig_node *orig_node, int if_num)
{
	void *data_ptr;

	data_ptr = kmalloc((if_num + 1) * sizeof(TYPE_OF_WORD) * NUM_WORDS,
			   GFP_ATOMIC);
	if (!data_ptr) {
		printk(KERN_ERR "batman-adv:Can't resize orig: out of memory\n");
		return -1;
	}

	memcpy(data_ptr, orig_node->bcast_own,
	       if_num * sizeof(TYPE_OF_WORD) * NUM_WORDS);
	kfree(orig_node->bcast_own);
	orig_node->bcast_own = data_ptr;

	data_ptr = kmalloc((if_num + 1) * sizeof(uint8_t), GFP_ATOMIC);
	if (!data_ptr) {
		printk(KERN_ERR "batman-adv:Can't resize orig: out of memory\n");
		return -1;
	}

	memcpy(data_ptr, orig_node->bcast_own_sum, if_num * sizeof(uint8_t));
	kfree(orig_node->bcast_own_sum);
	orig_node->bcast_own_sum = data_ptr;

	return 0;
}


/* adds an interface the interface list and activate it, if possible */
int hardif_add_interface(char *dev, int if_num)
{
	struct batman_if *batman_if;
	struct batman_packet *batman_packet;
	struct orig_node *orig_node;
	unsigned long flags;
	HASHIT(hashit);

	batman_if = kmalloc(sizeof(struct batman_if), GFP_KERNEL);

	if (!batman_if) {
		printk(KERN_ERR "batman-adv:Can't add interface (%s): out of memory\n", dev);
		return -1;
	}

	batman_if->net_dev = NULL;

	if ((if_num == 0) && (num_hna > 0))
		batman_if->packet_len = BAT_PACKET_LEN + num_hna * ETH_ALEN;
	else
		batman_if->packet_len = BAT_PACKET_LEN;

	batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_KERNEL);

	if (!batman_if->packet_buff) {
		printk(KERN_ERR "batman-adv:Can't add interface packet (%s): out of memory\n", dev);
		goto out;
	}

	batman_if->if_num = if_num;
	batman_if->dev = dev;
	batman_if->if_active = IF_INACTIVE;
	INIT_RCU_HEAD(&batman_if->rcu);

	printk(KERN_INFO "batman-adv:Adding interface: %s\n", dev);
	avail_ifs++;

	INIT_LIST_HEAD(&batman_if->list);

	batman_packet = (struct batman_packet *)(batman_if->packet_buff);
	batman_packet->packet_type = BAT_PACKET;
	batman_packet->version = COMPAT_VERSION;
	batman_packet->flags = 0x00;
	batman_packet->ttl = (batman_if->if_num > 0 ? 2 : TTL);
	batman_packet->flags = 0;
	batman_packet->tq = TQ_MAX_VALUE;
	batman_packet->num_hna = 0;

	if (batman_if->packet_len != BAT_PACKET_LEN) {
		unsigned char *hna_buff;
		int hna_len;

		hna_buff = batman_if->packet_buff + BAT_PACKET_LEN;
		hna_len = batman_if->packet_len - BAT_PACKET_LEN;
		batman_packet->num_hna = hna_local_fill_buffer(hna_buff,
							       hna_len);
	}

	atomic_set(&batman_if->seqno, 1);

	/* resize all orig nodes because orig_node->bcast_own(_sum) depend on
	 * if_num */
	spin_lock_irqsave(&orig_hash_lock, flags);

	while (hash_iterate(orig_hash, &hashit)) {
		orig_node = hashit.bucket->data;
		if (resize_orig(orig_node, if_num) == -1) {
			spin_unlock_irqrestore(&orig_hash_lock, flags);
			goto out;
		}
	}

	spin_unlock_irqrestore(&orig_hash_lock, flags);

	if (!hardif_is_interface_up(batman_if->dev))
		printk(KERN_ERR "batman-adv:Not using interface %s (retrying later): interface not active\n", batman_if->dev);
	else
		hardif_activate_interface(batman_if);

	list_add_tail_rcu(&batman_if->list, &if_list);

	/* begin sending originator messages on that interface */
	schedule_own_packet(batman_if);
	return 1;

out:
	kfree(batman_if->packet_buff);
	kfree(batman_if);
	kfree(dev);
	return -1;
}

char hardif_get_active_if_num(void)
{
	return active_ifs;
}

static int hard_if_event(struct notifier_block *this,
			    unsigned long event, void *ptr)
{
	struct net_device *dev = (struct net_device *)ptr;
	struct batman_if *batman_if = get_batman_if_by_name(dev->name);

	if (!batman_if)
		goto out;

	switch (event) {
	case NETDEV_GOING_DOWN:
	case NETDEV_DOWN:
	case NETDEV_UNREGISTER:
		hardif_deactivate_interface(batman_if);
		break;
	case NETDEV_UP:
		hardif_activate_interface(batman_if);
		if ((atomic_read(&module_state) == MODULE_INACTIVE) &&
		    (hardif_get_active_if_num() > 0)) {
			activate_module();
		}
		break;
	/* NETDEV_CHANGEADDR - mac address change - what are we doing here ? */
	default:
		break;
	};

	update_min_mtu();

out:
	return NOTIFY_DONE;
}

/* find batman interface by netdev. assumes rcu_read_lock on */
static struct batman_if *find_batman_if(struct net_device *dev)
{
	struct batman_if *batman_if;

	rcu_read_lock();
	list_for_each_entry_rcu(batman_if, &if_list, list) {
		if (batman_if->net_dev == dev) {
			rcu_read_unlock();
			return batman_if;
		}
	}
	rcu_read_unlock();
	return NULL;
}


/* receive a packet with the batman ethertype coming on a hard
 * interface */
int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
	struct packet_type *ptype, struct net_device *orig_dev)
{
	struct batman_packet *batman_packet;
	struct batman_if *batman_if;
	struct net_device_stats *stats;
	int ret;

    skb = skb_share_check(skb, GFP_ATOMIC);

    if (skb == NULL)
		goto err_free;

	/* packet should hold at least type and version */
	if (unlikely(skb_headlen(skb) < 2))
		goto err_free;

	/* expect a valid ethernet header here. */
	if (unlikely(skb->mac_len != sizeof(struct ethhdr)
				|| !skb_mac_header(skb)))
		goto err_free;

	batman_if = find_batman_if(skb->dev);
	if (!batman_if)
		goto err_free;

    stats = (struct net_device_stats *) dev_get_stats(skb->dev);
	if (stats) {
		stats->rx_packets++;
		stats->rx_bytes += skb->len;
	}

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

	if (batman_packet->version != COMPAT_VERSION) {
		bat_dbg(DBG_BATMAN,
			"Drop packet: incompatible batman version (%i)\n",
			batman_packet->version);
		goto err_free;
	}

	/* all receive handlers return whether they received or reused
	 * the supplied skb. if not, we have to free the skb. */

	switch (batman_packet->packet_type) {
		/* batman originator packet */
	case BAT_PACKET:
		ret = recv_bat_packet(skb, batman_if);
		break;

		/* batman icmp packet */
	case BAT_ICMP:
		ret = recv_icmp_packet(skb);
		break;

		/* unicast packet */
	case BAT_UNICAST:
		ret = recv_unicast_packet(skb);
		break;

		/* broadcast packet */
	case BAT_BCAST:
		ret = recv_bcast_packet(skb);
		break;

		/* vis packet */
	case BAT_VIS:
		ret = recv_vis_packet(skb);
		break;
	default:
		ret = NET_RX_DROP;
	}
	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);
    return NET_RX_DROP;

}


struct notifier_block hard_if_notifier = {
	.notifier_call = hard_if_event,
};
Commit	Line	Data
5beef3c9 AL	1	/*
	2	* Copyright (C) 2007-2009 B.A.T.M.A.N. contributors:
	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 "hard-interface.h"
5beef3c9 AL	24	#include "soft-interface.h"
	25	#include "send.h"
	26	#include "translation-table.h"
	27	#include "routing.h"
	28	#include "hash.h"
5beef3c9 AL	29
	30	#define MIN(x, y) ((x) < (y) ? (x) : (y))
	31
	32	static char avail_ifs;
	33	static char active_ifs;
	34
	35	static void hardif_free_interface(struct rcu_head *rcu);
	36
	37	static struct batman_if get_batman_if_by_name(char name)
	38	{
	39	struct batman_if *batman_if;
	40
	41	rcu_read_lock();
	42	list_for_each_entry_rcu(batman_if, &if_list, list) {
	43	if (strncmp(batman_if->dev, name, IFNAMSIZ) == 0)
	44	goto out;
	45	}
	46
	47	batman_if = NULL;
	48
	49	out:
	50	rcu_read_unlock();
	51	return batman_if;
	52	}
	53
	54	int hardif_min_mtu(void)
	55	{
	56	struct batman_if *batman_if;
	57	/* allow big frames if all devices are capable to do so
	58	* (have MTU > 1500 + BAT_HEADER_LEN) */
	59	int min_mtu = ETH_DATA_LEN;
	60
	61	rcu_read_lock();
	62	list_for_each_entry_rcu(batman_if, &if_list, list) {
	63	if ((batman_if->if_active == IF_ACTIVE) \|\|
	64	(batman_if->if_active == IF_TO_BE_ACTIVATED))
	65	min_mtu = MIN(batman_if->net_dev->mtu - BAT_HEADER_LEN,
	66	min_mtu);
	67	}
	68	rcu_read_unlock();
	69
	70	return min_mtu;
	71	}
	72
	73	static void check_known_mac_addr(uint8_t *addr)
	74	{
	75	struct batman_if *batman_if;
5beef3c9 AL	76
	77	rcu_read_lock();
	78	list_for_each_entry_rcu(batman_if, &if_list, list) {
	79	if ((batman_if->if_active != IF_ACTIVE) &&
	80	(batman_if->if_active != IF_TO_BE_ACTIVATED))
	81	continue;
	82
	83	if (!compare_orig(batman_if->net_dev->dev_addr, addr))
	84	continue;
	85
b9b27e4e AL	86	printk(KERN_WARNING "batman-adv:The newly added mac address (%pM) already exists on: %s\n",
b9b27e4e AL	87	addr, batman_if->dev);
bad2239e	88	printk(KERN_WARNING "batman-adv:It is strongly recommended to keep mac addresses unique to avoid problems!\n");
5beef3c9 AL	89	}
	90	rcu_read_unlock();
	91	}
	92
	93	/* adjusts the MTU if a new interface with a smaller MTU appeared. */
	94	void update_min_mtu(void)
	95	{
	96	int min_mtu;
	97
	98	min_mtu = hardif_min_mtu();
	99	if (soft_device->mtu != min_mtu)
	100	soft_device->mtu = min_mtu;
	101	}
	102
	103	/* checks if the interface is up. (returns 1 if it is) */
	104	static int hardif_is_interface_up(char *dev)
	105	{
	106	struct net_device *net_dev;
	107
	108	/**
	109	* if we already have an interface in our interface list and
	110	* the current interface is not the primary interface and
	111	* the primary interface is not up and
	112	* the primary interface has never been up - don't activate any
	113	* secondary interface !
	114	*/
	115
	116	rcu_read_lock();
	117	if ((!list_empty(&if_list)) &&
	118	strncmp(((struct batman_if *)if_list.next)->dev, dev, IFNAMSIZ) &&
	119	!(((struct batman_if *)if_list.next)->if_active == IF_ACTIVE) &&
	120	!(((struct batman_if *)if_list.next)->if_active == IF_TO_BE_ACTIVATED) &&
	121	(!main_if_was_up())) {
	122	rcu_read_unlock();
	123	goto end;
	124	}
	125	rcu_read_unlock();
	126
	127	#ifdef __NET_NET_NAMESPACE_H
	128	net_dev = dev_get_by_name(&init_net, dev);
	129	#else
	130	net_dev = dev_get_by_name(dev);
	131	#endif
	132	if (!net_dev)
	133	goto end;
	134
	135	if (!(net_dev->flags & IFF_UP))
	136	goto failure;
	137
	138	dev_put(net_dev);
	139	return 1;
	140
	141	failure:
	142	dev_put(net_dev);
	143	end:
	144	return 0;
	145	}
	146
	147	/* deactivates the interface. */
	148	void hardif_deactivate_interface(struct batman_if *batman_if)
	149	{
	150	if (batman_if->if_active != IF_ACTIVE)
	151	return;
	152
5beef3c9 AL	153	/**
	154	* batman_if->net_dev has been acquired by dev_get_by_name() in
	155	* proc_interfaces_write() and has to be unreferenced.
	156	*/
	157
	158	if (batman_if->net_dev)
	159	dev_put(batman_if->net_dev);
	160
5beef3c9 AL	161	batman_if->if_active = IF_INACTIVE;
	162	active_ifs--;
	163
bad2239e AL	164	printk(KERN_INFO "batman-adv:Interface deactivated: %s\n",
bad2239e AL	165	batman_if->dev);
5beef3c9 AL	166	}
	167
	168	/* (re)activate given interface. */
	169	static void hardif_activate_interface(struct batman_if *batman_if)
	170	{
5beef3c9 AL	171	if (batman_if->if_active != IF_INACTIVE)
	172	return;
	173
	174	#ifdef __NET_NET_NAMESPACE_H
	175	batman_if->net_dev = dev_get_by_name(&init_net, batman_if->dev);
	176	#else
	177	batman_if->net_dev = dev_get_by_name(batman_if->dev);
	178	#endif
	179	if (!batman_if->net_dev)
	180	goto dev_err;
	181
5beef3c9 AL	182	check_known_mac_addr(batman_if->net_dev->dev_addr);
5beef3c9 AL	183
5beef3c9 AL	184	addr_to_string(batman_if->addr_str, batman_if->net_dev->dev_addr);
	185
	186	memcpy(((struct batman_packet *)(batman_if->packet_buff))->orig,
	187	batman_if->net_dev->dev_addr, ETH_ALEN);
	188	memcpy(((struct batman_packet *)(batman_if->packet_buff))->prev_sender,
	189	batman_if->net_dev->dev_addr, ETH_ALEN);
	190
	191	batman_if->if_active = IF_TO_BE_ACTIVATED;
	192	active_ifs++;
	193
	194	/* save the mac address if it is our primary interface */
	195	if (batman_if->if_num == 0)
	196	set_main_if_addr(batman_if->net_dev->dev_addr);
	197
bad2239e AL	198	printk(KERN_INFO "batman-adv:Interface activated: %s\n",
bad2239e AL	199	batman_if->dev);
5beef3c9 AL	200
	201	return;
	202
5beef3c9	203	dev_err:
5beef3c9 AL	204	batman_if->net_dev = NULL;
	205	}
	206
	207	static void hardif_free_interface(struct rcu_head *rcu)
	208	{
	209	struct batman_if *batman_if = container_of(rcu, struct batman_if, rcu);
	210
	211	kfree(batman_if->packet_buff);
	212	kfree(batman_if->dev);
	213	kfree(batman_if);
	214	}
	215
	216	/**
	217	* called by
	218	* - echo '' > /proc/.../interfaces
	219	* - modprobe -r batman-adv-core
	220	*/
	221	/* removes and frees all interfaces */
	222	void hardif_remove_interfaces(void)
	223	{
	224	struct batman_if *batman_if = NULL;
	225
	226	avail_ifs = 0;
	227
	228	/* no lock needed - we don't delete somewhere else */
	229	list_for_each_entry(batman_if, &if_list, list) {
	230
	231	list_del_rcu(&batman_if->list);
	232
	233	/* first deactivate interface */
	234	if (batman_if->if_active != IF_INACTIVE)
	235	hardif_deactivate_interface(batman_if);
	236
	237	call_rcu(&batman_if->rcu, hardif_free_interface);
	238	}
	239	}
	240
	241	static int resize_orig(struct orig_node *orig_node, int if_num)
	242	{
	243	void *data_ptr;
	244
	245	data_ptr = kmalloc((if_num + 1) * sizeof(TYPE_OF_WORD) * NUM_WORDS,
	246	GFP_ATOMIC);
	247	if (!data_ptr) {
bad2239e	248	printk(KERN_ERR "batman-adv:Can't resize orig: out of memory\n");
5beef3c9 AL	249	return -1;
	250	}
	251
	252	memcpy(data_ptr, orig_node->bcast_own,
	253	if_num * sizeof(TYPE_OF_WORD) * NUM_WORDS);
	254	kfree(orig_node->bcast_own);
	255	orig_node->bcast_own = data_ptr;
	256
	257	data_ptr = kmalloc((if_num + 1) * sizeof(uint8_t), GFP_ATOMIC);
	258	if (!data_ptr) {
bad2239e	259	printk(KERN_ERR "batman-adv:Can't resize orig: out of memory\n");
5beef3c9 AL	260	return -1;
	261	}
	262
	263	memcpy(data_ptr, orig_node->bcast_own_sum, if_num * sizeof(uint8_t));
	264	kfree(orig_node->bcast_own_sum);
	265	orig_node->bcast_own_sum = data_ptr;
	266
	267	return 0;
	268	}
	269
	270
	271	/* adds an interface the interface list and activate it, if possible */
	272	int hardif_add_interface(char *dev, int if_num)
	273	{
	274	struct batman_if *batman_if;
	275	struct batman_packet *batman_packet;
	276	struct orig_node *orig_node;
e7017195	277	unsigned long flags;
b6c35976	278	HASHIT(hashit);
5beef3c9 AL	279
	280	batman_if = kmalloc(sizeof(struct batman_if), GFP_KERNEL);
	281
	282	if (!batman_if) {
bad2239e	283	printk(KERN_ERR "batman-adv:Can't add interface (%s): out of memory\n", dev);
5beef3c9 AL	284	return -1;
	285	}
	286
5beef3c9 AL	287	batman_if->net_dev = NULL;
	288
	289	if ((if_num == 0) && (num_hna > 0))
	290	batman_if->packet_len = BAT_PACKET_LEN + num_hna * ETH_ALEN;
	291	else
	292	batman_if->packet_len = BAT_PACKET_LEN;
	293
	294	batman_if->packet_buff = kmalloc(batman_if->packet_len, GFP_KERNEL);
	295
	296	if (!batman_if->packet_buff) {
bad2239e	297	printk(KERN_ERR "batman-adv:Can't add interface packet (%s): out of memory\n", dev);
5beef3c9 AL	298	goto out;
	299	}
	300
	301	batman_if->if_num = if_num;
	302	batman_if->dev = dev;
	303	batman_if->if_active = IF_INACTIVE;
	304	INIT_RCU_HEAD(&batman_if->rcu);
	305
bad2239e	306	printk(KERN_INFO "batman-adv:Adding interface: %s\n", dev);
5beef3c9 AL	307	avail_ifs++;
	308
	309	INIT_LIST_HEAD(&batman_if->list);
	310
	311	batman_packet = (struct batman_packet *)(batman_if->packet_buff);
	312	batman_packet->packet_type = BAT_PACKET;
	313	batman_packet->version = COMPAT_VERSION;
	314	batman_packet->flags = 0x00;
	315	batman_packet->ttl = (batman_if->if_num > 0 ? 2 : TTL);
	316	batman_packet->flags = 0;
	317	batman_packet->tq = TQ_MAX_VALUE;
	318	batman_packet->num_hna = 0;
	319
	320	if (batman_if->packet_len != BAT_PACKET_LEN) {
	321	unsigned char *hna_buff;
	322	int hna_len;
	323
	324	hna_buff = batman_if->packet_buff + BAT_PACKET_LEN;
	325	hna_len = batman_if->packet_len - BAT_PACKET_LEN;
	326	batman_packet->num_hna = hna_local_fill_buffer(hna_buff,
	327	hna_len);
	328	}
	329
	330	atomic_set(&batman_if->seqno, 1);
	331
	332	/* resize all orig nodes because orig_node->bcast_own(_sum) depend on
	333	* if_num */
e7017195	334	spin_lock_irqsave(&orig_hash_lock, flags);
5beef3c9	335
b6c35976 SW	336	while (hash_iterate(orig_hash, &hashit)) {
b6c35976 SW	337	orig_node = hashit.bucket->data;
5beef3c9	338	if (resize_orig(orig_node, if_num) == -1) {
e7017195	339	spin_unlock_irqrestore(&orig_hash_lock, flags);
5beef3c9 AL	340	goto out;
	341	}
	342	}
	343
e7017195	344	spin_unlock_irqrestore(&orig_hash_lock, flags);
5beef3c9 AL	345
5beef3c9 AL	346	if (!hardif_is_interface_up(batman_if->dev))
bad2239e	347	printk(KERN_ERR "batman-adv:Not using interface %s (retrying later): interface not active\n", batman_if->dev);
5beef3c9 AL	348	else
	349	hardif_activate_interface(batman_if);
	350
	351	list_add_tail_rcu(&batman_if->list, &if_list);
	352
	353	/* begin sending originator messages on that interface */
	354	schedule_own_packet(batman_if);
	355	return 1;
	356
	357	out:
acdfd0e0	358	kfree(batman_if->packet_buff);
5beef3c9 AL	359	kfree(batman_if);
	360	kfree(dev);
	361	return -1;
	362	}
	363
	364	char hardif_get_active_if_num(void)
	365	{
	366	return active_ifs;
	367	}
	368
	369	static int hard_if_event(struct notifier_block *this,
bad2239e	370	unsigned long event, void *ptr)
5beef3c9 AL	371	{
	372	struct net_device dev = (struct net_device )ptr;
	373	struct batman_if *batman_if = get_batman_if_by_name(dev->name);
	374
	375	if (!batman_if)
	376	goto out;
	377
	378	switch (event) {
	379	case NETDEV_GOING_DOWN:
	380	case NETDEV_DOWN:
	381	case NETDEV_UNREGISTER:
	382	hardif_deactivate_interface(batman_if);
	383	break;
	384	case NETDEV_UP:
	385	hardif_activate_interface(batman_if);
	386	if ((atomic_read(&module_state) == MODULE_INACTIVE) &&
	387	(hardif_get_active_if_num() > 0)) {
	388	activate_module();
	389	}
	390	break;
	391	/* NETDEV_CHANGEADDR - mac address change - what are we doing here ? */
	392	default:
5beef3c9 AL	393	break;
	394	};
	395
	396	update_min_mtu();
	397
	398	out:
	399	return NOTIFY_DONE;
	400	}
	401
e7017195 SW	402	/* find batman interface by netdev. assumes rcu_read_lock on */
	403	static struct batman_if find_batman_if(struct net_device dev)
	404	{
	405	struct batman_if *batman_if;
	406
	407	rcu_read_lock();
	408	list_for_each_entry_rcu(batman_if, &if_list, list) {
	409	if (batman_if->net_dev == dev) {
	410	rcu_read_unlock();
	411	return batman_if;
	412	}
	413	}
	414	rcu_read_unlock();
	415	return NULL;
	416	}
	417
	418
	419	/* receive a packet with the batman ethertype coming on a hard
	420	* interface */
	421	int batman_skb_recv(struct sk_buff skb, struct net_device dev,
	422	struct packet_type ptype, struct net_device orig_dev)
	423	{
	424	struct batman_packet *batman_packet;
	425	struct batman_if *batman_if;
	426	struct net_device_stats *stats;
	427	int ret;
	428
	429	skb = skb_share_check(skb, GFP_ATOMIC);
	430
	431	if (skb == NULL)
	432	goto err_free;
	433
	434	/* packet should hold at least type and version */
	435	if (unlikely(skb_headlen(skb) < 2))
	436	goto err_free;
	437
	438	/* expect a valid ethernet header here. */
	439	if (unlikely(skb->mac_len != sizeof(struct ethhdr)
	440	\|\| !skb_mac_header(skb)))
	441	goto err_free;
	442
	443	batman_if = find_batman_if(skb->dev);
	444	if (!batman_if)
	445	goto err_free;
	446
b9b27e4e AL	447	stats = (struct net_device_stats *) dev_get_stats(skb->dev);
	448	if (stats) {
	449	stats->rx_packets++;
	450	stats->rx_bytes += skb->len;
	451	}
e7017195 SW	452
	453	batman_packet = (struct batman_packet *)skb->data;
	454
	455	if (batman_packet->version != COMPAT_VERSION) {
	456	bat_dbg(DBG_BATMAN,
	457	"Drop packet: incompatible batman version (%i)\n",
	458	batman_packet->version);
	459	goto err_free;
	460	}
	461
	462	/* all receive handlers return whether they received or reused
	463	* the supplied skb. if not, we have to free the skb. */
	464
	465	switch (batman_packet->packet_type) {
	466	/* batman originator packet */
	467	case BAT_PACKET:
	468	ret = recv_bat_packet(skb, batman_if);
	469	break;
	470
	471	/* batman icmp packet */
	472	case BAT_ICMP:
	473	ret = recv_icmp_packet(skb);
	474	break;
	475
	476	/* unicast packet */
	477	case BAT_UNICAST:
	478	ret = recv_unicast_packet(skb);
	479	break;
	480
	481	/* broadcast packet */
	482	case BAT_BCAST:
	483	ret = recv_bcast_packet(skb);
	484	break;
	485
	486	/* vis packet */
	487	case BAT_VIS:
	488	ret = recv_vis_packet(skb);
	489	break;
	490	default:
	491	ret = NET_RX_DROP;
	492	}
	493	if (ret == NET_RX_DROP)
	494	kfree_skb(skb);
	495
	496	/* return NET_RX_SUCCESS in any case as we
	497	* most probably dropped the packet for
	498	* routing-logical reasons. */
	499
	500	return NET_RX_SUCCESS;
	501
	502	err_free:
	503	kfree_skb(skb);
	504	return NET_RX_DROP;
	505
	506	}
	507
	508
5beef3c9	509	struct notifier_block hard_if_notifier = {
bad2239e	510	.notifier_call = hard_if_event,
5beef3c9	511	};