[net-next-2.6.git] / drivers / staging / batman-adv / send.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 "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(void)
{
	return jiffies +
		(((atomic_read(&originator_interval) - JITTER +
		   (random32() % 2*JITTER)) * HZ) / 1000);
}

/* when do we schedule a forwarded packet to be sent */
static unsigned long forward_send_time(void)
{
	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_active != 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_active != 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_active != 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)
{
	unsigned long send_time;
	struct batman_packet *batman_packet;
	int vis_server = atomic_read(&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_active == IF_TO_BE_ACTIVATED)
		batman_if->if_active = IF_ACTIVE;

	/* if local hna has changed and interface is a primary interface */
	if ((atomic_read(&hna_local_changed)) && (batman_if->if_num == 0))
		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 = 0;

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

	slide_own_bcast_window(batman_if);
	send_time = own_send_time();
	add_bat_packet_to_list(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)
{
	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();
	add_bat_packet_to_list((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);
}

void add_bcast_packet_to_list(struct sk_buff *skb)
{
	struct forw_packet *forw_packet;

	forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
	if (!forw_packet)
		return;

	skb = skb_copy(skb, GFP_ATOMIC);
	if (!skb) {
		kfree(forw_packet);
		return;
	}

	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);
}

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);

	/* 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 and we are not shutting
	 * down */
	if ((forw_packet->num_packets < 3) &&
	    (atomic_read(&module_state) != MODULE_DEACTIVATING))
		_add_bcast_packet_to_list(forw_packet, ((5 * HZ) / 1000));
	else
		forw_packet_free(forw_packet);
}

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);

	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) &&
	    (atomic_read(&module_state) != MODULE_DEACTIVATING))
		schedule_own_packet(forw_packet->if_incoming);

	forw_packet_free(forw_packet);
}

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

	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) {

		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) {

		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 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 "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 */
	39	static unsigned long own_send_time(void)
	40	{
	41	return jiffies +
	42	(((atomic_read(&originator_interval) - JITTER +
	43	(random32() % 2JITTER)) HZ) / 1000);
	44	}
	45
	46	/* when do we schedule a forwarded packet to be sent */
	47	static unsigned long forward_send_time(void)
	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 AL	59
5beef3c9 AL	60	if (batman_if->if_active != 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 AL	67	printk(KERN_WARNING
	68	"batman-adv:Interface %s is not up - can't send packet via that interface!\n",
	69	batman_if->dev);
e7017195	70	goto send_skb_err;
5beef3c9 AL	71	}
5beef3c9 AL	72
e7017195 SW	73	/* push to the ethernet header. */
	74	if (my_skb_push(skb, sizeof(struct ethhdr)) < 0)
	75	goto send_skb_err;
5beef3c9	76
e7017195	77	skb_reset_mac_header(skb);
5beef3c9	78
e7017195	79	ethhdr = (struct ethhdr *) skb_mac_header(skb);
5beef3c9 AL	80	memcpy(ethhdr->h_source, batman_if->net_dev->dev_addr, ETH_ALEN);
	81	memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN);
	82	ethhdr->h_proto = __constant_htons(ETH_P_BATMAN);
	83
5beef3c9 AL	84	skb_set_network_header(skb, ETH_HLEN);
	85	skb->priority = TC_PRIO_CONTROL;
	86	skb->protocol = __constant_htons(ETH_P_BATMAN);
e7017195	87
5beef3c9 AL	88	skb->dev = batman_if->net_dev;
	89
	90	/* dev_queue_xmit() returns a negative result on error. However on
	91	* congestion and traffic shaping, it drops and returns NET_XMIT_DROP
	92	* (which is > 0). This will not be treated as an error. */
e7017195 SW	93
	94	return dev_queue_xmit(skb);
	95	send_skb_err:
	96	kfree_skb(skb);
	97	return NET_XMIT_DROP;
	98	}
	99
	100	/* sends a raw packet. */
	101	void send_raw_packet(unsigned char *pack_buff, int pack_buff_len,
	102	struct batman_if batman_if, uint8_t dst_addr)
	103	{
	104	struct sk_buff *skb;
	105	char *data;
	106
	107	skb = dev_alloc_skb(pack_buff_len + sizeof(struct ethhdr));
	108	if (!skb)
	109	return;
	110	data = skb_put(skb, pack_buff_len + sizeof(struct ethhdr));
	111	memcpy(data + sizeof(struct ethhdr), pack_buff, pack_buff_len);
	112	/* pull back to the batman "network header" */
	113	skb_pull(skb, sizeof(struct ethhdr));
	114	send_skb_packet(skb, batman_if, dst_addr);
5beef3c9 AL	115	}
	116
	117	/* Send a packet to a given interface */
	118	static void send_packet_to_if(struct forw_packet *forw_packet,
	119	struct batman_if *batman_if)
	120	{
	121	char *fwd_str;
	122	uint8_t packet_num;
	123	int16_t buff_pos;
	124	struct batman_packet *batman_packet;
5beef3c9 AL	125
	126	if (batman_if->if_active != IF_ACTIVE)
	127	return;
	128
46712df6 AG	129	packet_num = 0;
46712df6 AG	130	buff_pos = 0;
5beef3c9 AL	131	batman_packet = (struct batman_packet *)
	132	(forw_packet->packet_buff);
	133
	134	/* adjust all flags and log packets */
	135	while (aggregated_packet(buff_pos,
	136	forw_packet->packet_len,
	137	batman_packet->num_hna)) {
	138
	139	/* we might have aggregated direct link packets with an
	140	* ordinary base packet */
	141	if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
	142	(forw_packet->if_incoming == batman_if))
	143	batman_packet->flags \|= DIRECTLINK;
	144	else
	145	batman_packet->flags &= ~DIRECTLINK;
	146
5beef3c9 AL	147	fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
	148	"Sending own" :
	149	"Forwarding"));
bad2239e	150	bat_dbg(DBG_BATMAN,
b9b27e4e	151	"%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d, IDF %s) on interface %s [%s]\n",
bad2239e AL	152	fwd_str,
bad2239e AL	153	(packet_num > 0 ? "aggregated " : ""),
b9b27e4e	154	batman_packet->orig, ntohs(batman_packet->seqno),
bad2239e AL	155	batman_packet->tq, batman_packet->ttl,
	156	(batman_packet->flags & DIRECTLINK ?
	157	"on" : "off"),
	158	batman_if->dev, batman_if->addr_str);
5beef3c9 AL	159
	160	buff_pos += sizeof(struct batman_packet) +
	161	(batman_packet->num_hna * ETH_ALEN);
	162	packet_num++;
	163	batman_packet = (struct batman_packet *)
	164	(forw_packet->packet_buff + buff_pos);
	165	}
	166
	167	send_raw_packet(forw_packet->packet_buff,
	168	forw_packet->packet_len,
	169	batman_if, broadcastAddr);
	170	}
	171
	172	/* send a batman packet */
	173	static void send_packet(struct forw_packet *forw_packet)
	174	{
	175	struct batman_if *batman_if;
	176	struct batman_packet *batman_packet =
	177	(struct batman_packet *)(forw_packet->packet_buff);
5beef3c9 AL	178	unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0);
	179
	180	if (!forw_packet->if_incoming) {
bad2239e	181	printk(KERN_ERR "batman-adv: Error - can't forward packet: incoming iface not specified\n");
5beef3c9 AL	182	return;
	183	}
	184
	185	if (forw_packet->if_incoming->if_active != IF_ACTIVE)
	186	return;
	187
5beef3c9 AL	188	/* multihomed peer assumed */
	189	/* non-primary OGMs are only broadcasted on their interface */
	190	if ((directlink && (batman_packet->ttl == 1)) \|\|
	191	(forw_packet->own && (forw_packet->if_incoming->if_num > 0))) {
	192
	193	/* FIXME: what about aggregated packets ? */
bad2239e	194	bat_dbg(DBG_BATMAN,
b9b27e4e	195	"%s packet (originator %pM, seqno %d, TTL %d) on interface %s [%s]\n",
bad2239e	196	(forw_packet->own ? "Sending own" : "Forwarding"),
b9b27e4e	197	batman_packet->orig, ntohs(batman_packet->seqno),
bad2239e AL	198	batman_packet->ttl, forw_packet->if_incoming->dev,
bad2239e AL	199	forw_packet->if_incoming->addr_str);
5beef3c9 AL	200
	201	send_raw_packet(forw_packet->packet_buff,
	202	forw_packet->packet_len,
	203	forw_packet->if_incoming,
	204	broadcastAddr);
	205	return;
	206	}
	207
	208	/* broadcast on every interface */
	209	rcu_read_lock();
	210	list_for_each_entry_rcu(batman_if, &if_list, list)
	211	send_packet_to_if(forw_packet, batman_if);
	212	rcu_read_unlock();
	213	}
	214
	215	static void rebuild_batman_packet(struct batman_if *batman_if)
	216	{
	217	int new_len;
	218	unsigned char *new_buff;
	219	struct batman_packet *batman_packet;
	220
	221	new_len = sizeof(struct batman_packet) + (num_hna * ETH_ALEN);
	222	new_buff = kmalloc(new_len, GFP_ATOMIC);
	223
	224	/* keep old buffer if kmalloc should fail */
	225	if (new_buff) {
	226	memcpy(new_buff, batman_if->packet_buff,
	227	sizeof(struct batman_packet));
	228	batman_packet = (struct batman_packet *)new_buff;
	229
	230	batman_packet->num_hna = hna_local_fill_buffer(
	231	new_buff + sizeof(struct batman_packet),
	232	new_len - sizeof(struct batman_packet));
	233
	234	kfree(batman_if->packet_buff);
	235	batman_if->packet_buff = new_buff;
	236	batman_if->packet_len = new_len;
	237	}
	238	}
	239
	240	void schedule_own_packet(struct batman_if *batman_if)
	241	{
	242	unsigned long send_time;
	243	struct batman_packet *batman_packet;
837b8248	244	int vis_server = atomic_read(&vis_mode);
5beef3c9 AL	245
	246	/**
	247	* the interface gets activated here to avoid race conditions between
	248	* the moment of activating the interface in
	249	* hardif_activate_interface() where the originator mac is set and
	250	* outdated packets (especially uninitialized mac addresses) in the
	251	* packet queue
	252	*/
	253	if (batman_if->if_active == IF_TO_BE_ACTIVATED)
	254	batman_if->if_active = IF_ACTIVE;
	255
	256	/* if local hna has changed and interface is a primary interface */
	257	if ((atomic_read(&hna_local_changed)) && (batman_if->if_num == 0))
	258	rebuild_batman_packet(batman_if);
	259
	260	/**
	261	* NOTE: packet_buff might just have been re-allocated in
	262	* rebuild_batman_packet()
	263	*/
	264	batman_packet = (struct batman_packet *)batman_if->packet_buff;
	265
	266	/* change sequence number to network order */
	267	batman_packet->seqno = htons((uint16_t)atomic_read(&batman_if->seqno));
	268
837b8248	269	if (vis_server == VIS_TYPE_SERVER_SYNC)
5beef3c9 AL	270	batman_packet->flags = VIS_SERVER;
	271	else
	272	batman_packet->flags = 0;
	273
	274	/* could be read by receive_bat_packet() */
	275	atomic_inc(&batman_if->seqno);
	276
	277	slide_own_bcast_window(batman_if);
	278	send_time = own_send_time();
	279	add_bat_packet_to_list(batman_if->packet_buff,
	280	batman_if->packet_len, batman_if, 1, send_time);
	281	}
	282
	283	void schedule_forward_packet(struct orig_node *orig_node,
	284	struct ethhdr *ethhdr,
	285	struct batman_packet *batman_packet,
	286	uint8_t directlink, int hna_buff_len,
	287	struct batman_if *if_incoming)
	288	{
	289	unsigned char in_tq, in_ttl, tq_avg = 0;
	290	unsigned long send_time;
	291
	292	if (batman_packet->ttl <= 1) {
bad2239e	293	bat_dbg(DBG_BATMAN, "ttl exceeded \n");
5beef3c9 AL	294	return;
	295	}
	296
	297	in_tq = batman_packet->tq;
	298	in_ttl = batman_packet->ttl;
	299
	300	batman_packet->ttl--;
	301	memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
	302
	303	/* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
	304	* of our best tq value */
	305	if ((orig_node->router) && (orig_node->router->tq_avg != 0)) {
	306
	307	/* rebroadcast ogm of best ranking neighbor as is */
	308	if (!compare_orig(orig_node->router->addr, ethhdr->h_source)) {
	309	batman_packet->tq = orig_node->router->tq_avg;
	310
	311	if (orig_node->router->last_ttl)
	312	batman_packet->ttl = orig_node->router->last_ttl - 1;
	313	}
	314
	315	tq_avg = orig_node->router->tq_avg;
	316	}
	317
	318	/* apply hop penalty */
	319	batman_packet->tq = hop_penalty(batman_packet->tq);
	320
bad2239e AL	321	bat_dbg(DBG_BATMAN, "Forwarding packet: tq_orig: %i, tq_avg: %i, tq_forw: %i, ttl_orig: %i, ttl_forw: %i \n",
	322	in_tq, tq_avg, batman_packet->tq, in_ttl - 1,
	323	batman_packet->ttl);
5beef3c9 AL	324
	325	batman_packet->seqno = htons(batman_packet->seqno);
	326
	327	if (directlink)
	328	batman_packet->flags \|= DIRECTLINK;
	329	else
	330	batman_packet->flags &= ~DIRECTLINK;
	331
	332	send_time = forward_send_time();
	333	add_bat_packet_to_list((unsigned char *)batman_packet,
	334	sizeof(struct batman_packet) + hna_buff_len,
	335	if_incoming, 0, send_time);
	336	}
	337
	338	static void forw_packet_free(struct forw_packet *forw_packet)
	339	{
e7017195 SW	340	if (forw_packet->skb)
e7017195 SW	341	kfree_skb(forw_packet->skb);
5beef3c9 AL	342	kfree(forw_packet->packet_buff);
	343	kfree(forw_packet);
	344	}
	345
	346	static void _add_bcast_packet_to_list(struct forw_packet *forw_packet,
	347	unsigned long send_time)
	348	{
cec4a69c	349	unsigned long flags;
5beef3c9 AL	350	INIT_HLIST_NODE(&forw_packet->list);
	351
	352	/* add new packet to packet list */
cec4a69c	353	spin_lock_irqsave(&forw_bcast_list_lock, flags);
5beef3c9	354	hlist_add_head(&forw_packet->list, &forw_bcast_list);
cec4a69c	355	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
5beef3c9 AL	356
	357	/* start timer for this packet */
	358	INIT_DELAYED_WORK(&forw_packet->delayed_work,
	359	send_outstanding_bcast_packet);
	360	queue_delayed_work(bat_event_workqueue, &forw_packet->delayed_work,
	361	send_time);
	362	}
	363
e7017195	364	void add_bcast_packet_to_list(struct sk_buff *skb)
5beef3c9 AL	365	{
	366	struct forw_packet *forw_packet;
	367
	368	forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
	369	if (!forw_packet)
	370	return;
	371
e7017195 SW	372	skb = skb_copy(skb, GFP_ATOMIC);
e7017195 SW	373	if (!skb) {
e281cf89	374	kfree(forw_packet);
5beef3c9	375	return;
e281cf89	376	}
5beef3c9	377
e7017195 SW	378	skb_reset_mac_header(skb);
	379
	380	forw_packet->skb = skb;
	381	forw_packet->packet_buff = NULL;
5beef3c9 AL	382
	383	/* how often did we send the bcast packet ? */
	384	forw_packet->num_packets = 0;
	385
	386	_add_bcast_packet_to_list(forw_packet, 1);
	387	}
	388
	389	void send_outstanding_bcast_packet(struct work_struct *work)
	390	{
	391	struct batman_if *batman_if;
	392	struct delayed_work *delayed_work =
	393	container_of(work, struct delayed_work, work);
	394	struct forw_packet *forw_packet =
	395	container_of(delayed_work, struct forw_packet, delayed_work);
cec4a69c	396	unsigned long flags;
e7017195	397	struct sk_buff *skb1;
5beef3c9	398
cec4a69c	399	spin_lock_irqsave(&forw_bcast_list_lock, flags);
5beef3c9	400	hlist_del(&forw_packet->list);
cec4a69c	401	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
5beef3c9 AL	402
	403	/* rebroadcast packet */
	404	rcu_read_lock();
	405	list_for_each_entry_rcu(batman_if, &if_list, list) {
e7017195 SW	406	/* send a copy of the saved skb */
	407	skb1 = skb_copy(forw_packet->skb, GFP_ATOMIC);
	408	if (skb1)
	409	send_skb_packet(skb1,
5beef3c9 AL	410	batman_if, broadcastAddr);
	411	}
	412	rcu_read_unlock();
	413
	414	forw_packet->num_packets++;
	415
	416	/* if we still have some more bcasts to send and we are not shutting
	417	* down */
	418	if ((forw_packet->num_packets < 3) &&
	419	(atomic_read(&module_state) != MODULE_DEACTIVATING))
	420	_add_bcast_packet_to_list(forw_packet, ((5 * HZ) / 1000));
	421	else
	422	forw_packet_free(forw_packet);
	423	}
	424
	425	void send_outstanding_bat_packet(struct work_struct *work)
	426	{
	427	struct delayed_work *delayed_work =
	428	container_of(work, struct delayed_work, work);
	429	struct forw_packet *forw_packet =
	430	container_of(delayed_work, struct forw_packet, delayed_work);
e7017195	431	unsigned long flags;
5beef3c9	432
e7017195	433	spin_lock_irqsave(&forw_bat_list_lock, flags);
5beef3c9	434	hlist_del(&forw_packet->list);
e7017195	435	spin_unlock_irqrestore(&forw_bat_list_lock, flags);
5beef3c9 AL	436
	437	send_packet(forw_packet);
	438
	439	/**
	440	* we have to have at least one packet in the queue
	441	* to determine the queues wake up time unless we are
	442	* shutting down
	443	*/
	444	if ((forw_packet->own) &&
	445	(atomic_read(&module_state) != MODULE_DEACTIVATING))
	446	schedule_own_packet(forw_packet->if_incoming);
	447
	448	forw_packet_free(forw_packet);
	449	}
	450
	451	void purge_outstanding_packets(void)
	452	{
	453	struct forw_packet *forw_packet;
	454	struct hlist_node tmp_node, safe_tmp_node;
cec4a69c	455	unsigned long flags;
5beef3c9	456
bad2239e	457	bat_dbg(DBG_BATMAN, "purge_outstanding_packets()\n");
5beef3c9 AL	458
5beef3c9 AL	459	/* free bcast list */
cec4a69c	460	spin_lock_irqsave(&forw_bcast_list_lock, flags);
5beef3c9 AL	461	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
	462	&forw_bcast_list, list) {
	463
cec4a69c	464	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
5beef3c9 AL	465
	466	/**
	467	* send_outstanding_bcast_packet() will lock the list to
	468	* delete the item from the list
	469	*/
	470	cancel_delayed_work_sync(&forw_packet->delayed_work);
cec4a69c	471	spin_lock_irqsave(&forw_bcast_list_lock, flags);
5beef3c9	472	}
cec4a69c	473	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
5beef3c9 AL	474
5beef3c9 AL	475	/* free batman packet list */
e7017195	476	spin_lock_irqsave(&forw_bat_list_lock, flags);
5beef3c9 AL	477	hlist_for_each_entry_safe(forw_packet, tmp_node, safe_tmp_node,
	478	&forw_bat_list, list) {
	479
e7017195	480	spin_unlock_irqrestore(&forw_bat_list_lock, flags);
5beef3c9 AL	481
	482	/**
	483	* send_outstanding_bat_packet() will lock the list to
	484	* delete the item from the list
	485	*/
	486	cancel_delayed_work_sync(&forw_packet->delayed_work);
e7017195	487	spin_lock_irqsave(&forw_bat_list_lock, flags);
5beef3c9	488	}
e7017195	489	spin_unlock_irqrestore(&forw_bat_list_lock, flags);
5beef3c9	490	}