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

/*
 * Copyright (C) 2007-2010 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 "send.h"
#include "routing.h"
#include "translation-table.h"
#include "soft-interface.h"
#include "hard-interface.h"
#include "types.h"
#include "vis.h"
#include "aggregation.h"

/* apply hop penalty for a normal link */
static uint8_t hop_penalty(const uint8_t tq)
{
	return (tq * (TQ_MAX_VALUE - TQ_HOP_PENALTY)) / (TQ_MAX_VALUE);
}

/* when do we schedule our own packet to be sent */
static unsigned long own_send_time(struct bat_priv *bat_priv)
{
	return jiffies +
		(((atomic_read(&bat_priv->orig_interval) - JITTER +
		   (random32() % 2*JITTER)) * HZ) / 1000);
}

/* when do we schedule a forwarded packet to be sent */
static unsigned long forward_send_time(struct bat_priv *bat_priv)
{
	return jiffies + (((random32() % (JITTER/2)) * HZ) / 1000);
}

/* send out an already prepared packet to the given address via the
 * specified batman interface */
int send_skb_packet(struct sk_buff *skb,
				struct batman_if *batman_if,
				uint8_t *dst_addr)
{
	struct ethhdr *ethhdr;

	if (batman_if->if_status != IF_ACTIVE)
		goto send_skb_err;

	if (unlikely(!batman_if->net_dev))
		goto send_skb_err;

	if (!(batman_if->net_dev->flags & IFF_UP)) {
		printk(KERN_WARNING
		       "batman-adv:Interface %s "
		       "is not up - can't send packet via that interface!\n",
		       batman_if->dev);
		goto send_skb_err;
	}

	/* push to the ethernet header. */
	if (my_skb_push(skb, sizeof(struct ethhdr)) < 0)
		goto send_skb_err;

	skb_reset_mac_header(skb);

	ethhdr = (struct ethhdr *) skb_mac_header(skb);
	memcpy(ethhdr->h_source, batman_if->net_dev->dev_addr, ETH_ALEN);
	memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
	ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);

	skb_set_network_header(skb, ETH_HLEN);
	skb->priority = TC_PRIO_CONTROL;
	skb->protocol = __constant_htons(ETH_P_BATMAN);

	skb->dev = batman_if->net_dev;

	/* dev_queue_xmit() returns a negative result on error.	 However on
	 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
	 * (which is > 0). This will not be treated as an error. */

	return dev_queue_xmit(skb);
send_skb_err:
	kfree_skb(skb);
	return NET_XMIT_DROP;
}

/* sends a raw packet. */
void send_raw_packet(unsigned char *pack_buff, int pack_buff_len,
		     struct batman_if *batman_if, uint8_t *dst_addr)
{
	struct sk_buff *skb;
	char *data;

	skb = dev_alloc_skb(pack_buff_len + sizeof(struct ethhdr));
	if (!skb)
		return;
	data = skb_put(skb, pack_buff_len + sizeof(struct ethhdr));
	memcpy(data + sizeof(struct ethhdr), pack_buff, pack_buff_len);
	/* pull back to the batman "network header" */
	skb_pull(skb, sizeof(struct ethhdr));
	send_skb_packet(skb, batman_if, dst_addr);
}

/* Send a packet to a given interface */
static void send_packet_to_if(struct forw_packet *forw_packet,
			      struct batman_if *batman_if)
{
	char *fwd_str;
	uint8_t packet_num;
	int16_t buff_pos;
	struct batman_packet *batman_packet;

	if (batman_if->if_status != IF_ACTIVE)
		return;

	packet_num = 0;
	buff_pos = 0;
	batman_packet = (struct batman_packet *)
		(forw_packet->packet_buff);

	/* adjust all flags and log packets */
	while (aggregated_packet(buff_pos,
				 forw_packet->packet_len,
				 batman_packet->num_hna)) {

		/* we might have aggregated direct link packets with an
		 * ordinary base packet */
		if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
		    (forw_packet->if_incoming == batman_if))
			batman_packet->flags |= DIRECTLINK;
		else
			batman_packet->flags &= ~DIRECTLINK;

		fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
							    "Sending own" :
							    "Forwarding"));
		bat_dbg(DBG_BATMAN,
			"%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d,"
			" IDF %s) on interface %s [%s]\n",
			fwd_str, (packet_num > 0 ? "aggregated " : ""),
			batman_packet->orig, ntohs(batman_packet->seqno),
			batman_packet->tq, batman_packet->ttl,
			(batman_packet->flags & DIRECTLINK ?
			 "on" : "off"),
			batman_if->dev, batman_if->addr_str);

		buff_pos += sizeof(struct batman_packet) +
			(batman_packet->num_hna * ETH_ALEN);
		packet_num++;
		batman_packet = (struct batman_packet *)
			(forw_packet->packet_buff + buff_pos);
	}

	send_raw_packet(forw_packet->packet_buff,
			forw_packet->packet_len,
			batman_if, broadcastAddr);
}

/* send a batman packet */
static void send_packet(struct forw_packet *forw_packet)
{
	struct batman_if *batman_if;
	struct batman_packet *batman_packet =
		(struct batman_packet *)(forw_packet->packet_buff);
	unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);

	if (!forw_packet->if_incoming) {
		printk(KERN_ERR "batman-adv: Error - can't forward packet: "
		       "incoming iface not specified\n");
		return;
	}

	if (forw_packet->if_incoming->if_status != IF_ACTIVE)
		return;

	/* multihomed peer assumed */
	/* non-primary OGMs are only broadcasted on their interface */
	if ((directlink && (batman_packet->ttl == 1)) ||
	    (forw_packet->own && (forw_packet->if_incoming->if_num > 0))) {

		/* FIXME: what about aggregated packets ? */
		bat_dbg(DBG_BATMAN,
			"%s packet (originator %pM, seqno %d, TTL %d) "
			"on interface %s [%s]\n",
			(forw_packet->own ? "Sending own" : "Forwarding"),
			batman_packet->orig, ntohs(batman_packet->seqno),
			batman_packet->ttl, forw_packet->if_incoming->dev,
			forw_packet->if_incoming->addr_str);

		send_raw_packet(forw_packet->packet_buff,
				forw_packet->packet_len,
				forw_packet->if_incoming,
				broadcastAddr);
		return;
	}

	/* broadcast on every interface */
	rcu_read_lock();
	list_for_each_entry_rcu(batman_if, &if_list, list)
		send_packet_to_if(forw_packet, batman_if);
	rcu_read_unlock();
}

static void rebuild_batman_packet(struct batman_if *batman_if)
{
	int new_len;
	unsigned char *new_buff;
	struct batman_packet *batman_packet;

	new_len = sizeof(struct batman_packet) + (num_hna * ETH_ALEN);
	new_buff = kmalloc(new_len, GFP_ATOMIC);

	/* keep old buffer if kmalloc should fail */
	if (new_buff) {
		memcpy(new_buff, batman_if->packet_buff,
		       sizeof(struct batman_packet));
		batman_packet = (struct batman_packet *)new_buff;

		batman_packet->num_hna = hna_local_fill_buffer(
			new_buff + sizeof(struct batman_packet),
			new_len - sizeof(struct batman_packet));

		kfree(batman_if->packet_buff);
		batman_if->packet_buff = new_buff;
		batman_if->packet_len = new_len;
	}
}

void schedule_own_packet(struct batman_if *batman_if)
{
	/* FIXME: each batman_if will be attached to a softif */
	struct bat_priv *bat_priv = netdev_priv(soft_device);
	unsigned long send_time;
	struct batman_packet *batman_packet;
	int vis_server;

	if ((batman_if->if_status == IF_NOT_IN_USE) ||
	    (batman_if->if_status == IF_TO_BE_REMOVED))
		return;

	vis_server = atomic_read(&bat_priv->vis_mode);

	/**
	 * the interface gets activated here to avoid race conditions between
	 * the moment of activating the interface in
	 * hardif_activate_interface() where the originator mac is set and
	 * outdated packets (especially uninitialized mac addresses) in the
	 * packet queue
	 */
	if (batman_if->if_status == IF_TO_BE_ACTIVATED)
		batman_if->if_status = IF_ACTIVE;

	/* if local hna has changed and interface is a primary interface */
	if ((atomic_read(&hna_local_changed)) &&
	    (batman_if == bat_priv->primary_if))
		rebuild_batman_packet(batman_if);

	/**
	 * NOTE: packet_buff might just have been re-allocated in
	 * rebuild_batman_packet()
	 */
	batman_packet = (struct batman_packet *)batman_if->packet_buff;

	/* change sequence number to network order */
	batman_packet->seqno = htons((uint16_t)atomic_read(&batman_if->seqno));

	if (vis_server == VIS_TYPE_SERVER_SYNC)
		batman_packet->flags = VIS_SERVER;
	else
		batman_packet->flags &= ~VIS_SERVER;

	/* could be read by receive_bat_packet() */
	atomic_inc(&batman_if->seqno);

	slide_own_bcast_window(batman_if);
	send_time = own_send_time(bat_priv);
	add_bat_packet_to_list(bat_priv,
			       batman_if->packet_buff,
			       batman_if->packet_len,
			       batman_if, 1, send_time);
}

void schedule_forward_packet(struct orig_node *orig_node,
			     struct ethhdr *ethhdr,
			     struct batman_packet *batman_packet,
			     uint8_t directlink, int hna_buff_len,
			     struct batman_if *if_incoming)
{
	/* FIXME: each batman_if will be attached to a softif */
	struct bat_priv *bat_priv = netdev_priv(soft_device);
	unsigned char in_tq, in_ttl, tq_avg = 0;
	unsigned long send_time;

	if (batman_packet->ttl <= 1) {
		bat_dbg(DBG_BATMAN, "ttl exceeded\n");
		return;
	}

	in_tq = batman_packet->tq;
	in_ttl = batman_packet->ttl;

	batman_packet->ttl--;
	memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);

	/* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
	 * of our best tq value */
	if ((orig_node->router) && (orig_node->router->tq_avg != 0)) {

		/* rebroadcast ogm of best ranking neighbor as is */
		if (!compare_orig(orig_node->router->addr, ethhdr->h_source)) {
			batman_packet->tq = orig_node->router->tq_avg;

			if (orig_node->router->last_ttl)
				batman_packet->ttl = orig_node->router->last_ttl
							- 1;
		}

		tq_avg = orig_node->router->tq_avg;
	}

	/* apply hop penalty */
	batman_packet->tq = hop_penalty(batman_packet->tq);

	bat_dbg(DBG_BATMAN, "Forwarding packet: tq_orig: %i, tq_avg: %i, "
		"tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
		in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
		batman_packet->ttl);

	batman_packet->seqno = htons(batman_packet->seqno);

	if (directlink)
		batman_packet->flags |= DIRECTLINK;
	else
		batman_packet->flags &= ~DIRECTLINK;

	send_time = forward_send_time(bat_priv);
	add_bat_packet_to_list(bat_priv,
			       (unsigned char *)batman_packet,
			       sizeof(struct batman_packet) + hna_buff_len,
			       if_incoming, 0, send_time);
}

static void forw_packet_free(struct forw_packet *forw_packet)
{
	if (forw_packet->skb)
		kfree_skb(forw_packet->skb);
	kfree(forw_packet->packet_buff);
	kfree(forw_packet);
}

static void _add_bcast_packet_to_list(struct forw_packet *forw_packet,
				      unsigned long send_time)
{
	unsigned long flags;
	INIT_HLIST_NODE(&forw_packet->list);

	/* add new packet to packet list */
	spin_lock_irqsave(&forw_bcast_list_lock, flags);
	hlist_add_head(&forw_packet->list, &forw_bcast_list);
	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);

	/* start timer for this packet */
	INIT_DELAYED_WORK(&forw_packet->delayed_work,
			  send_outstanding_bcast_packet);
	queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work,
			   send_time);
}

#define atomic_dec_not_zero(v)          atomic_add_unless((v), -1, 0)
/* add a broadcast packet to the queue and setup timers. broadcast packets
 * are sent multiple times to increase probability for beeing received.
 *
 * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
 * errors.
 *
 * The skb is not consumed, so the caller should make sure that the
 * skb is freed. */
int add_bcast_packet_to_list(struct sk_buff *skb)
{
	struct forw_packet *forw_packet;

	if (!atomic_dec_not_zero(&bcast_queue_left)) {
		bat_dbg(DBG_BATMAN, "bcast packet queue full\n");
		goto out;
	}

	forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);

	if (!forw_packet)
		goto out_and_inc;

	skb = skb_copy(skb, GFP_ATOMIC);
	if (!skb)
		goto packet_free;

	skb_reset_mac_header(skb);

	forw_packet->skb = skb;
	forw_packet->packet_buff = NULL;

	/* how often did we send the bcast packet ? */
	forw_packet->num_packets = 0;

	_add_bcast_packet_to_list(forw_packet, 1);
	return NETDEV_TX_OK;

packet_free:
	kfree(forw_packet);
out_and_inc:
	atomic_inc(&bcast_queue_left);
out:
	return NETDEV_TX_BUSY;
}

void send_outstanding_bcast_packet(struct work_struct *work)
{
	struct batman_if *batman_if;
	struct delayed_work *delayed_work =
		container_of(work, struct delayed_work, work);
	struct forw_packet *forw_packet =
		container_of(delayed_work, struct forw_packet, delayed_work);
	unsigned long flags;
	struct sk_buff *skb1;

	spin_lock_irqsave(&forw_bcast_list_lock, flags);
	hlist_del(&forw_packet->list);
	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);

	if (atomic_read(&module_state) == MODULE_DEACTIVATING)
		goto out;

	/* rebroadcast packet */
	rcu_read_lock();
	list_for_each_entry_rcu(batman_if, &if_list, list) {
		/* send a copy of the saved skb */
		skb1 = skb_copy(forw_packet->skb, GFP_ATOMIC);
		if (skb1)
			send_skb_packet(skb1,
				batman_if, broadcastAddr);
	}
	rcu_read_unlock();

	forw_packet->num_packets++;

	/* if we still have some more bcasts to send */
	if (forw_packet->num_packets < 3) {
		_add_bcast_packet_to_list(forw_packet, ((5 * HZ) / 1000));
		return;
	}

out:
	forw_packet_free(forw_packet);
	atomic_inc(&bcast_queue_left);
}

void send_outstanding_bat_packet(struct work_struct *work)
{
	struct delayed_work *delayed_work =
		container_of(work, struct delayed_work, work);
	struct forw_packet *forw_packet =
		container_of(delayed_work, struct forw_packet, delayed_work);
	unsigned long flags;

	spin_lock_irqsave(&forw_bat_list_lock, flags);
	hlist_del(&forw_packet->list);
	spin_unlock_irqrestore(&forw_bat_list_lock, flags);

	if (atomic_read(&module_state) == MODULE_DEACTIVATING)
		goto out;

	send_packet(forw_packet);

	/**
	 * we have to have at least one packet in the queue
	 * to determine the queues wake up time unless we are
	 * shutting down
	 */
	if (forw_packet->own)
		schedule_own_packet(forw_packet->if_incoming);

out:
	/* don't count own packet */
	if (!forw_packet->own)
		atomic_inc(&batman_queue_left);

	forw_packet_free(forw_packet);
}

void purge_outstanding_packets(struct batman_if *batman_if)
{
	struct forw_packet *forw_packet;
	struct hlist_node *tmp_node, *safe_tmp_node;
	unsigned long flags;

	if (batman_if)
		bat_dbg(DBG_BATMAN, "purge_outstanding_packets(): %s\n",
			batman_if->dev);
	else
		bat_dbg(DBG_BATMAN, "purge_outstanding_packets()\n");

	/* free bcast list */
	spin_lock_irqsave(&forw_bcast_list_lock, flags);
	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
				  &forw_bcast_list, list) {

		/**
		 * if purge_outstanding_packets() was called with an argmument
		 * we delete only packets belonging to the given interface
		 */
		if ((batman_if) &&
		    (forw_packet->if_incoming != batman_if))
			continue;

		spin_unlock_irqrestore(&forw_bcast_list_lock, flags);

		/**
		 * send_outstanding_bcast_packet() will lock the list to
		 * delete the item from the list
		 */
		cancel_delayed_work_sync(&forw_packet->delayed_work);
		spin_lock_irqsave(&forw_bcast_list_lock, flags);
	}
	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);

	/* free batman packet list */
	spin_lock_irqsave(&forw_bat_list_lock, flags);
	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
				  &forw_bat_list, list) {

		/**
		 * if purge_outstanding_packets() was called with an argmument
		 * we delete only packets belonging to the given interface
		 */
		if ((batman_if) &&
		    (forw_packet->if_incoming != batman_if))
			continue;

		spin_unlock_irqrestore(&forw_bat_list_lock, flags);

		/**
		 * send_outstanding_bat_packet() will lock the list to
		 * delete the item from the list
		 */
		cancel_delayed_work_sync(&forw_packet->delayed_work);
		spin_lock_irqsave(&forw_bat_list_lock, flags);
	}
	spin_unlock_irqrestore(&forw_bat_list_lock, flags);
}
Commit	Line	Data
5beef3c9	1	/*
9b6d10b7	2	* Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
5beef3c9 AL	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 "send.h"
5beef3c9 AL	24	#include "routing.h"
5beef3c9 AL	25	#include "translation-table.h"
e7017195	26	#include "soft-interface.h"
5beef3c9 AL	27	#include "hard-interface.h"
	28	#include "types.h"
	29	#include "vis.h"
	30	#include "aggregation.h"
	31
5beef3c9 AL	32	/* apply hop penalty for a normal link */
	33	static uint8_t hop_penalty(const uint8_t tq)
	34	{
	35	return (tq * (TQ_MAX_VALUE - TQ_HOP_PENALTY)) / (TQ_MAX_VALUE);
	36	}
	37
	38	/* when do we schedule our own packet to be sent */
1d59f82c	39	static unsigned long own_send_time(struct bat_priv *bat_priv)
5beef3c9 AL	40	{
5beef3c9 AL	41	return jiffies +
1d59f82c	42	(((atomic_read(&bat_priv->orig_interval) - JITTER +
5beef3c9 AL	43	(random32() % 2JITTER)) HZ) / 1000);
	44	}
	45
	46	/* when do we schedule a forwarded packet to be sent */
47fdf097	47	static unsigned long forward_send_time(struct bat_priv *bat_priv)
5beef3c9	48	{
bd13b616	49	return jiffies + (((random32() % (JITTER/2)) * HZ) / 1000);
5beef3c9 AL	50	}
5beef3c9 AL	51
e7017195 SW	52	/* send out an already prepared packet to the given address via the
	53	* specified batman interface */
	54	int send_skb_packet(struct sk_buff *skb,
	55	struct batman_if *batman_if,
	56	uint8_t *dst_addr)
5beef3c9 AL	57	{
5beef3c9 AL	58	struct ethhdr *ethhdr;
5beef3c9	59
208e13e4	60	if (batman_if->if_status != IF_ACTIVE)
e7017195 SW	61	goto send_skb_err;
	62
	63	if (unlikely(!batman_if->net_dev))
	64	goto send_skb_err;
5beef3c9 AL	65
5beef3c9 AL	66	if (!(batman_if->net_dev->flags & IFF_UP)) {
bad2239e	67	printk(KERN_WARNING
6d45d8df SE	68	"batman-adv:Interface %s "
6d45d8df SE	69	"is not up - can't send packet via that interface!\n",
bad2239e	70	batman_if->dev);
e7017195	71	goto send_skb_err;
5beef3c9 AL	72	}
5beef3c9 AL	73
e7017195 SW	74	/* push to the ethernet header. */
	75	if (my_skb_push(skb, sizeof(struct ethhdr)) < 0)
	76	goto send_skb_err;
5beef3c9	77
e7017195	78	skb_reset_mac_header(skb);
5beef3c9	79
e7017195	80	ethhdr = (struct ethhdr *) skb_mac_header(skb);
5beef3c9 AL	81	memcpy(ethhdr->h_source, batman_if->net_dev->dev_addr, ETH_ALEN);
	82	memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
	83	ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);
	84
5beef3c9 AL	85	skb_set_network_header(skb, ETH_HLEN);
	86	skb->priority = TC_PRIO_CONTROL;
	87	skb->protocol = __constant_htons(ETH_P_BATMAN);
e7017195	88
5beef3c9 AL	89	skb->dev = batman_if->net_dev;
	90
	91	/* dev_queue_xmit() returns a negative result on error. However on
	92	* congestion and traffic shaping, it drops and returns NET_XMIT_DROP
	93	* (which is > 0). This will not be treated as an error. */
e7017195 SW	94
	95	return dev_queue_xmit(skb);
	96	send_skb_err:
	97	kfree_skb(skb);
	98	return NET_XMIT_DROP;
	99	}
	100
	101	/* sends a raw packet. */
	102	void send_raw_packet(unsigned char *pack_buff, int pack_buff_len,
	103	struct batman_if batman_if, uint8_t dst_addr)
	104	{
	105	struct sk_buff *skb;
	106	char *data;
	107
	108	skb = dev_alloc_skb(pack_buff_len + sizeof(struct ethhdr));
	109	if (!skb)
	110	return;
	111	data = skb_put(skb, pack_buff_len + sizeof(struct ethhdr));
	112	memcpy(data + sizeof(struct ethhdr), pack_buff, pack_buff_len);
	113	/* pull back to the batman "network header" */
	114	skb_pull(skb, sizeof(struct ethhdr));
	115	send_skb_packet(skb, batman_if, dst_addr);
5beef3c9 AL	116	}
	117
	118	/* Send a packet to a given interface */
	119	static void send_packet_to_if(struct forw_packet *forw_packet,
	120	struct batman_if *batman_if)
	121	{
	122	char *fwd_str;
	123	uint8_t packet_num;
	124	int16_t buff_pos;
	125	struct batman_packet *batman_packet;
5beef3c9	126
208e13e4	127	if (batman_if->if_status != IF_ACTIVE)
5beef3c9 AL	128	return;
5beef3c9 AL	129
46712df6 AG	130	packet_num = 0;
46712df6 AG	131	buff_pos = 0;
5beef3c9 AL	132	batman_packet = (struct batman_packet *)
	133	(forw_packet->packet_buff);
	134
	135	/* adjust all flags and log packets */
	136	while (aggregated_packet(buff_pos,
	137	forw_packet->packet_len,
	138	batman_packet->num_hna)) {
	139
	140	/* we might have aggregated direct link packets with an
	141	* ordinary base packet */
	142	if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
	143	(forw_packet->if_incoming == batman_if))
	144	batman_packet->flags \|= DIRECTLINK;
	145	else
	146	batman_packet->flags &= ~DIRECTLINK;
	147
5beef3c9 AL	148	fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
	149	"Sending own" :
	150	"Forwarding"));
bad2239e	151	bat_dbg(DBG_BATMAN,
6d45d8df SE	152	"%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d,"
	153	" IDF %s) on interface %s [%s]\n",
	154	fwd_str, (packet_num > 0 ? "aggregated " : ""),
b9b27e4e	155	batman_packet->orig, ntohs(batman_packet->seqno),
bad2239e AL	156	batman_packet->tq, batman_packet->ttl,
	157	(batman_packet->flags & DIRECTLINK ?
	158	"on" : "off"),
	159	batman_if->dev, batman_if->addr_str);
5beef3c9 AL	160
	161	buff_pos += sizeof(struct batman_packet) +
	162	(batman_packet->num_hna * ETH_ALEN);
	163	packet_num++;
	164	batman_packet = (struct batman_packet *)
	165	(forw_packet->packet_buff + buff_pos);
	166	}
	167
	168	send_raw_packet(forw_packet->packet_buff,
	169	forw_packet->packet_len,
	170	batman_if, broadcastAddr);
	171	}
	172
	173	/* send a batman packet */
	174	static void send_packet(struct forw_packet *forw_packet)
	175	{
	176	struct batman_if *batman_if;
	177	struct batman_packet *batman_packet =
	178	(struct batman_packet *)(forw_packet->packet_buff);
5beef3c9 AL	179	unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);
	180
	181	if (!forw_packet->if_incoming) {
6d45d8df SE	182	printk(KERN_ERR "batman-adv: Error - can't forward packet: "
6d45d8df SE	183	"incoming iface not specified\n");
5beef3c9 AL	184	return;
	185	}
	186
208e13e4	187	if (forw_packet->if_incoming->if_status != IF_ACTIVE)
5beef3c9 AL	188	return;
5beef3c9 AL	189
5beef3c9 AL	190	/* multihomed peer assumed */
	191	/* non-primary OGMs are only broadcasted on their interface */
	192	if ((directlink && (batman_packet->ttl == 1)) \|\|
	193	(forw_packet->own && (forw_packet->if_incoming->if_num > 0))) {
	194
	195	/* FIXME: what about aggregated packets ? */
bad2239e	196	bat_dbg(DBG_BATMAN,
6d45d8df SE	197	"%s packet (originator %pM, seqno %d, TTL %d) "
6d45d8df SE	198	"on interface %s [%s]\n",
bad2239e	199	(forw_packet->own ? "Sending own" : "Forwarding"),
b9b27e4e	200	batman_packet->orig, ntohs(batman_packet->seqno),
bad2239e AL	201	batman_packet->ttl, forw_packet->if_incoming->dev,
bad2239e AL	202	forw_packet->if_incoming->addr_str);
5beef3c9 AL	203
	204	send_raw_packet(forw_packet->packet_buff,
	205	forw_packet->packet_len,
	206	forw_packet->if_incoming,
	207	broadcastAddr);
	208	return;
	209	}
	210
	211	/* broadcast on every interface */
	212	rcu_read_lock();
	213	list_for_each_entry_rcu(batman_if, &if_list, list)
	214	send_packet_to_if(forw_packet, batman_if);
	215	rcu_read_unlock();
	216	}
	217
	218	static void rebuild_batman_packet(struct batman_if *batman_if)
	219	{
	220	int new_len;
	221	unsigned char *new_buff;
	222	struct batman_packet *batman_packet;
	223
	224	new_len = sizeof(struct batman_packet) + (num_hna * ETH_ALEN);
	225	new_buff = kmalloc(new_len, GFP_ATOMIC);
	226
	227	/* keep old buffer if kmalloc should fail */
	228	if (new_buff) {
	229	memcpy(new_buff, batman_if->packet_buff,
	230	sizeof(struct batman_packet));
	231	batman_packet = (struct batman_packet *)new_buff;
	232
	233	batman_packet->num_hna = hna_local_fill_buffer(
	234	new_buff + sizeof(struct batman_packet),
	235	new_len - sizeof(struct batman_packet));
	236
	237	kfree(batman_if->packet_buff);
	238	batman_if->packet_buff = new_buff;
	239	batman_if->packet_len = new_len;
	240	}
	241	}
	242
	243	void schedule_own_packet(struct batman_if *batman_if)
	244	{
47fdf097 ML	245	/* FIXME: each batman_if will be attached to a softif */
47fdf097 ML	246	struct bat_priv *bat_priv = netdev_priv(soft_device);
5beef3c9 AL	247	unsigned long send_time;
5beef3c9 AL	248	struct batman_packet *batman_packet;
208e13e4 ML	249	int vis_server;
	250
	251	if ((batman_if->if_status == IF_NOT_IN_USE) \|\|
	252	(batman_if->if_status == IF_TO_BE_REMOVED))
	253	return;
	254
	255	vis_server = atomic_read(&bat_priv->vis_mode);
5beef3c9 AL	256
	257	/**
	258	* the interface gets activated here to avoid race conditions between
	259	* the moment of activating the interface in
	260	* hardif_activate_interface() where the originator mac is set and
	261	* outdated packets (especially uninitialized mac addresses) in the
	262	* packet queue
	263	*/
208e13e4 ML	264	if (batman_if->if_status == IF_TO_BE_ACTIVATED)
208e13e4 ML	265	batman_if->if_status = IF_ACTIVE;
5beef3c9 AL	266
5beef3c9 AL	267	/* if local hna has changed and interface is a primary interface */
208e13e4 ML	268	if ((atomic_read(&hna_local_changed)) &&
208e13e4 ML	269	(batman_if == bat_priv->primary_if))
5beef3c9 AL	270	rebuild_batman_packet(batman_if);
	271
	272	/**
	273	* NOTE: packet_buff might just have been re-allocated in
	274	* rebuild_batman_packet()
	275	*/
	276	batman_packet = (struct batman_packet *)batman_if->packet_buff;
	277
	278	/* change sequence number to network order */
	279	batman_packet->seqno = htons((uint16_t)atomic_read(&batman_if->seqno));
	280
837b8248	281	if (vis_server == VIS_TYPE_SERVER_SYNC)
5beef3c9 AL	282	batman_packet->flags = VIS_SERVER;
5beef3c9 AL	283	else
14741240	284	batman_packet->flags &= ~VIS_SERVER;
5beef3c9 AL	285
	286	/* could be read by receive_bat_packet() */
	287	atomic_inc(&batman_if->seqno);
	288
	289	slide_own_bcast_window(batman_if);
1d59f82c	290	send_time = own_send_time(bat_priv);
14741240 ML	291	add_bat_packet_to_list(bat_priv,
14741240 ML	292	batman_if->packet_buff,
47fdf097	293	batman_if->packet_len,
14741240	294	batman_if, 1, send_time);
5beef3c9 AL	295	}
	296
	297	void schedule_forward_packet(struct orig_node *orig_node,
	298	struct ethhdr *ethhdr,
	299	struct batman_packet *batman_packet,
	300	uint8_t directlink, int hna_buff_len,
	301	struct batman_if *if_incoming)
	302	{
47fdf097 ML	303	/* FIXME: each batman_if will be attached to a softif */
47fdf097 ML	304	struct bat_priv *bat_priv = netdev_priv(soft_device);
5beef3c9 AL	305	unsigned char in_tq, in_ttl, tq_avg = 0;
	306	unsigned long send_time;
	307
	308	if (batman_packet->ttl <= 1) {
0887635b	309	bat_dbg(DBG_BATMAN, "ttl exceeded\n");
5beef3c9 AL	310	return;
	311	}
	312
	313	in_tq = batman_packet->tq;
	314	in_ttl = batman_packet->ttl;
	315
	316	batman_packet->ttl--;
	317	memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
	318
	319	/* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
	320	* of our best tq value */
	321	if ((orig_node->router) && (orig_node->router->tq_avg != 0)) {
	322
	323	/* rebroadcast ogm of best ranking neighbor as is */
	324	if (!compare_orig(orig_node->router->addr, ethhdr->h_source)) {
	325	batman_packet->tq = orig_node->router->tq_avg;
	326
	327	if (orig_node->router->last_ttl)
6d45d8df SE	328	batman_packet->ttl = orig_node->router->last_ttl
6d45d8df SE	329	- 1;
5beef3c9 AL	330	}
	331
	332	tq_avg = orig_node->router->tq_avg;
	333	}
	334
	335	/* apply hop penalty */
	336	batman_packet->tq = hop_penalty(batman_packet->tq);
	337
6d45d8df SE	338	bat_dbg(DBG_BATMAN, "Forwarding packet: tq_orig: %i, tq_avg: %i, "
6d45d8df SE	339	"tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
bad2239e AL	340	in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
bad2239e AL	341	batman_packet->ttl);
5beef3c9 AL	342
	343	batman_packet->seqno = htons(batman_packet->seqno);
	344
	345	if (directlink)
	346	batman_packet->flags \|= DIRECTLINK;
	347	else
	348	batman_packet->flags &= ~DIRECTLINK;
	349
47fdf097	350	send_time = forward_send_time(bat_priv);
14741240 ML	351	add_bat_packet_to_list(bat_priv,
14741240 ML	352	(unsigned char *)batman_packet,
5beef3c9	353	sizeof(struct batman_packet) + hna_buff_len,
14741240	354	if_incoming, 0, send_time);
5beef3c9 AL	355	}
	356
	357	static void forw_packet_free(struct forw_packet *forw_packet)
	358	{
e7017195 SW	359	if (forw_packet->skb)
e7017195 SW	360	kfree_skb(forw_packet->skb);
5beef3c9 AL	361	kfree(forw_packet->packet_buff);
	362	kfree(forw_packet);
	363	}
	364
	365	static void _add_bcast_packet_to_list(struct forw_packet *forw_packet,
	366	unsigned long send_time)
	367	{
cec4a69c	368	unsigned long flags;
5beef3c9 AL	369	INIT_HLIST_NODE(&forw_packet->list);
	370
	371	/* add new packet to packet list */
cec4a69c	372	spin_lock_irqsave(&forw_bcast_list_lock, flags);
5beef3c9	373	hlist_add_head(&forw_packet->list, &forw_bcast_list);
cec4a69c	374	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
5beef3c9 AL	375
	376	/* start timer for this packet */
	377	INIT_DELAYED_WORK(&forw_packet->delayed_work,
	378	send_outstanding_bcast_packet);
	379	queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work,
	380	send_time);
	381	}
	382
19dae340 SW	383	#define atomic_dec_not_zero(v) atomic_add_unless((v), -1, 0)
	384	/* add a broadcast packet to the queue and setup timers. broadcast packets
	385	* are sent multiple times to increase probability for beeing received.
	386	*
	387	* This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on
	388	* errors.
	389	*
	390	* The skb is not consumed, so the caller should make sure that the
	391	* skb is freed. */
	392	int add_bcast_packet_to_list(struct sk_buff *skb)
5beef3c9 AL	393	{
	394	struct forw_packet *forw_packet;
	395
19dae340 SW	396	if (!atomic_dec_not_zero(&bcast_queue_left)) {
	397	bat_dbg(DBG_BATMAN, "bcast packet queue full\n");
	398	goto out;
	399	}
	400
5beef3c9	401	forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
19dae340	402
5beef3c9	403	if (!forw_packet)
19dae340	404	goto out_and_inc;
5beef3c9	405
e7017195	406	skb = skb_copy(skb, GFP_ATOMIC);
208e13e4 ML	407	if (!skb)
208e13e4 ML	408	goto packet_free;
5beef3c9	409
e7017195 SW	410	skb_reset_mac_header(skb);
	411
	412	forw_packet->skb = skb;
	413	forw_packet->packet_buff = NULL;
5beef3c9 AL	414
	415	/* how often did we send the bcast packet ? */
	416	forw_packet->num_packets = 0;
	417
	418	_add_bcast_packet_to_list(forw_packet, 1);
19dae340	419	return NETDEV_TX_OK;
208e13e4 ML	420
	421	packet_free:
	422	kfree(forw_packet);
19dae340 SW	423	out_and_inc:
19dae340 SW	424	atomic_inc(&bcast_queue_left);
208e13e4	425	out:
19dae340	426	return NETDEV_TX_BUSY;
5beef3c9 AL	427	}
	428
	429	void send_outstanding_bcast_packet(struct work_struct *work)
	430	{
	431	struct batman_if *batman_if;
	432	struct delayed_work *delayed_work =
	433	container_of(work, struct delayed_work, work);
	434	struct forw_packet *forw_packet =
	435	container_of(delayed_work, struct forw_packet, delayed_work);
cec4a69c	436	unsigned long flags;
e7017195	437	struct sk_buff *skb1;
5beef3c9	438
cec4a69c	439	spin_lock_irqsave(&forw_bcast_list_lock, flags);
5beef3c9	440	hlist_del(&forw_packet->list);
cec4a69c	441	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
5beef3c9	442
5f411a90 ML	443	if (atomic_read(&module_state) == MODULE_DEACTIVATING)
	444	goto out;
	445
5beef3c9 AL	446	/* rebroadcast packet */
	447	rcu_read_lock();
	448	list_for_each_entry_rcu(batman_if, &if_list, list) {
e7017195 SW	449	/* send a copy of the saved skb */
	450	skb1 = skb_copy(forw_packet->skb, GFP_ATOMIC);
	451	if (skb1)
	452	send_skb_packet(skb1,
5beef3c9 AL	453	batman_if, broadcastAddr);
	454	}
	455	rcu_read_unlock();
	456
	457	forw_packet->num_packets++;
	458
5f411a90 ML	459	/* if we still have some more bcasts to send */
5f411a90 ML	460	if (forw_packet->num_packets < 3) {
5beef3c9	461	_add_bcast_packet_to_list(forw_packet, ((5 * HZ) / 1000));
5f411a90	462	return;
19dae340	463	}
5f411a90 ML	464
	465	out:
	466	forw_packet_free(forw_packet);
	467	atomic_inc(&bcast_queue_left);
5beef3c9 AL	468	}
	469
	470	void send_outstanding_bat_packet(struct work_struct *work)
	471	{
	472	struct delayed_work *delayed_work =
	473	container_of(work, struct delayed_work, work);
	474	struct forw_packet *forw_packet =
	475	container_of(delayed_work, struct forw_packet, delayed_work);
e7017195	476	unsigned long flags;
5beef3c9	477
e7017195	478	spin_lock_irqsave(&forw_bat_list_lock, flags);
5beef3c9	479	hlist_del(&forw_packet->list);
e7017195	480	spin_unlock_irqrestore(&forw_bat_list_lock, flags);
5beef3c9	481
5f411a90 ML	482	if (atomic_read(&module_state) == MODULE_DEACTIVATING)
	483	goto out;
	484
5beef3c9 AL	485	send_packet(forw_packet);
	486
	487	/**
	488	* we have to have at least one packet in the queue
	489	* to determine the queues wake up time unless we are
	490	* shutting down
	491	*/
5f411a90	492	if (forw_packet->own)
5beef3c9 AL	493	schedule_own_packet(forw_packet->if_incoming);
5beef3c9 AL	494
5f411a90	495	out:
19dae340 SW	496	/* don't count own packet */
	497	if (!forw_packet->own)
	498	atomic_inc(&batman_queue_left);
	499
5beef3c9 AL	500	forw_packet_free(forw_packet);
	501	}
	502
208e13e4	503	void purge_outstanding_packets(struct batman_if *batman_if)
5beef3c9 AL	504	{
	505	struct forw_packet *forw_packet;
	506	struct hlist_node tmp_node, safe_tmp_node;
cec4a69c	507	unsigned long flags;
5beef3c9	508
208e13e4 ML	509	if (batman_if)
	510	bat_dbg(DBG_BATMAN, "purge_outstanding_packets(): %s\n",
	511	batman_if->dev);
	512	else
	513	bat_dbg(DBG_BATMAN, "purge_outstanding_packets()\n");
5beef3c9 AL	514
5beef3c9 AL	515	/* free bcast list */
cec4a69c	516	spin_lock_irqsave(&forw_bcast_list_lock, flags);
5beef3c9 AL	517	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
	518	&forw_bcast_list, list) {
	519
208e13e4 ML	520	/**
	521	* if purge_outstanding_packets() was called with an argmument
	522	* we delete only packets belonging to the given interface
	523	*/
	524	if ((batman_if) &&
	525	(forw_packet->if_incoming != batman_if))
	526	continue;
	527
cec4a69c	528	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
5beef3c9 AL	529
	530	/**
	531	* send_outstanding_bcast_packet() will lock the list to
	532	* delete the item from the list
	533	*/
	534	cancel_delayed_work_sync(&forw_packet->delayed_work);
cec4a69c	535	spin_lock_irqsave(&forw_bcast_list_lock, flags);
5beef3c9	536	}
cec4a69c	537	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
5beef3c9 AL	538
5beef3c9 AL	539	/* free batman packet list */
e7017195	540	spin_lock_irqsave(&forw_bat_list_lock, flags);
5beef3c9 AL	541	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
	542	&forw_bat_list, list) {
	543
208e13e4 ML	544	/**
	545	* if purge_outstanding_packets() was called with an argmument
	546	* we delete only packets belonging to the given interface
	547	*/
	548	if ((batman_if) &&
	549	(forw_packet->if_incoming != batman_if))
	550	continue;
	551
e7017195	552	spin_unlock_irqrestore(&forw_bat_list_lock, flags);
5beef3c9 AL	553
	554	/**
	555	* send_outstanding_bat_packet() will lock the list to
	556	* delete the item from the list
	557	*/
	558	cancel_delayed_work_sync(&forw_packet->delayed_work);
e7017195	559	spin_lock_irqsave(&forw_bat_list_lock, flags);
5beef3c9	560	}
e7017195	561	spin_unlock_irqrestore(&forw_bat_list_lock, flags);
5beef3c9	562	}