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Commit fc957275 authored by Marek Lindner's avatar Marek Lindner
Browse files

batman-adv: agglomerate all batman iv ogm processing functions in a single file 



In preparation of the upcoming improved routing algorithm the code based has
to be re-organized to allow choosing the routing algorithm at compile time.

Signed-off-by: default avatarMarek Lindner <lindner_marek@yahoo.de>
parent b6da4bf5

net/batman-adv/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
obj-$(CONFIG_BATMAN_ADV) += batman-adv.o

batman-adv-y += aggregation.o

batman-adv-y += bat_debugfs.o

batman-adv-y += bat_iv_ogm.o

batman-adv-y += bat_sysfs.o

batman-adv-y += bitarray.o

batman-adv-y += gateway_client.o

net/batman-adv/aggregation.c

+0 −31
Original line number Diff line number Diff line
@@ -264,34 +264,3 @@ void add_bat_packet_to_list(struct bat_priv *bat_priv, 
		spin_unlock_bh(&bat_priv->forw_bat_list_lock);

	}

}
 


/* unpack the aggregated packets and process them one by one */

void receive_aggr_bat_packet(const struct ethhdr *ethhdr,

			     unsigned char *packet_buff, int packet_len,

			     struct hard_iface *if_incoming)

{

	struct batman_ogm_packet *batman_ogm_packet;

	int buff_pos = 0;

	unsigned char *tt_buff;



	batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;



	do {

		/* network to host order for our 32bit seqno and the

		   orig_interval */

		batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);

		batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);



		tt_buff = packet_buff + buff_pos + BATMAN_OGM_LEN;



		receive_bat_packet(ethhdr, batman_ogm_packet,

				   tt_buff, if_incoming);



		buff_pos += BATMAN_OGM_LEN +

				tt_len(batman_ogm_packet->tt_num_changes);



		batman_ogm_packet = (struct batman_ogm_packet *)

						(packet_buff + buff_pos);

	} while (aggregated_packet(buff_pos, packet_len,

				   batman_ogm_packet->tt_num_changes));

}

net/batman-adv/aggregation.h

+0 −3
Original line number Diff line number Diff line
@@ -38,8 +38,5 @@ void add_bat_packet_to_list(struct bat_priv *bat_priv, 
			    unsigned char *packet_buff, int packet_len,

			    struct hard_iface *if_incoming, int own_packet,

			    unsigned long send_time);

void receive_aggr_bat_packet(const struct ethhdr *ethhdr,

			     unsigned char *packet_buff, int packet_len,

			     struct hard_iface *if_incoming);



#endif /* _NET_BATMAN_ADV_AGGREGATION_H_ */

net/batman-adv/bat_iv_ogm.c

0 → 100644
+639 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:

 *

 * Marek Lindner, Simon Wunderlich

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of version 2 of the GNU General Public

 * License as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

 * 02110-1301, USA

 *

 */



#include "main.h"

#include "bat_ogm.h"

#include "translation-table.h"

#include "ring_buffer.h"

#include "originator.h"

#include "routing.h"

#include "gateway_common.h"

#include "gateway_client.h"

#include "hard-interface.h"

#include "send.h"



/* is there another aggregated packet here? */

static int bat_ogm_aggr_packet(int buff_pos, int packet_len,

			       int tt_num_changes)

{

	int next_buff_pos = buff_pos + BATMAN_OGM_LEN + tt_len(tt_num_changes);



	return (next_buff_pos <= packet_len) &&

		(next_buff_pos <= MAX_AGGREGATION_BYTES);

}



static void bat_ogm_orig_update(struct bat_priv *bat_priv,

				struct orig_node *orig_node,

				const struct ethhdr *ethhdr,

				const struct batman_ogm_packet

							*batman_ogm_packet,

				struct hard_iface *if_incoming,

				const unsigned char *tt_buff, int is_duplicate)

{

	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;

	struct neigh_node *router = NULL;

	struct orig_node *orig_node_tmp;

	struct hlist_node *node;

	uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;



	bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "

		"Searching and updating originator entry of received packet\n");



	rcu_read_lock();

	hlist_for_each_entry_rcu(tmp_neigh_node, node,

				 &orig_node->neigh_list, list) {

		if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&

		    (tmp_neigh_node->if_incoming == if_incoming) &&

		     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {

			if (neigh_node)

				neigh_node_free_ref(neigh_node);

			neigh_node = tmp_neigh_node;

			continue;

		}



		if (is_duplicate)

			continue;



		spin_lock_bh(&tmp_neigh_node->tq_lock);

		ring_buffer_set(tmp_neigh_node->tq_recv,

				&tmp_neigh_node->tq_index, 0);

		tmp_neigh_node->tq_avg =

			ring_buffer_avg(tmp_neigh_node->tq_recv);

		spin_unlock_bh(&tmp_neigh_node->tq_lock);

	}



	if (!neigh_node) {

		struct orig_node *orig_tmp;



		orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);

		if (!orig_tmp)

			goto unlock;



		neigh_node = create_neighbor(orig_node, orig_tmp,

					     ethhdr->h_source, if_incoming);



		orig_node_free_ref(orig_tmp);

		if (!neigh_node)

			goto unlock;

	} else

		bat_dbg(DBG_BATMAN, bat_priv,

			"Updating existing last-hop neighbor of originator\n");



	rcu_read_unlock();



	orig_node->flags = batman_ogm_packet->flags;

	neigh_node->last_valid = jiffies;



	spin_lock_bh(&neigh_node->tq_lock);

	ring_buffer_set(neigh_node->tq_recv,

			&neigh_node->tq_index,

			batman_ogm_packet->tq);

	neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);

	spin_unlock_bh(&neigh_node->tq_lock);



	if (!is_duplicate) {

		orig_node->last_ttl = batman_ogm_packet->ttl;

		neigh_node->last_ttl = batman_ogm_packet->ttl;

	}



	bonding_candidate_add(orig_node, neigh_node);



	/* if this neighbor already is our next hop there is nothing

	 * to change */

	router = orig_node_get_router(orig_node);

	if (router == neigh_node)

		goto update_tt;



	/* if this neighbor does not offer a better TQ we won't consider it */

	if (router && (router->tq_avg > neigh_node->tq_avg))

		goto update_tt;



	/* if the TQ is the same and the link not more symmetric we

	 * won't consider it either */

	if (router && (neigh_node->tq_avg == router->tq_avg)) {

		orig_node_tmp = router->orig_node;

		spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);

		bcast_own_sum_orig =

			orig_node_tmp->bcast_own_sum[if_incoming->if_num];

		spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);



		orig_node_tmp = neigh_node->orig_node;

		spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);

		bcast_own_sum_neigh =

			orig_node_tmp->bcast_own_sum[if_incoming->if_num];

		spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);



		if (bcast_own_sum_orig >= bcast_own_sum_neigh)

			goto update_tt;

	}



	update_route(bat_priv, orig_node, neigh_node);



update_tt:

	/* I have to check for transtable changes only if the OGM has been

	 * sent through a primary interface */

	if (((batman_ogm_packet->orig != ethhdr->h_source) &&

	     (batman_ogm_packet->ttl > 2)) ||

	    (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))

		tt_update_orig(bat_priv, orig_node, tt_buff,

			       batman_ogm_packet->tt_num_changes,

			       batman_ogm_packet->ttvn,

			       batman_ogm_packet->tt_crc);



	if (orig_node->gw_flags != batman_ogm_packet->gw_flags)

		gw_node_update(bat_priv, orig_node,

			       batman_ogm_packet->gw_flags);



	orig_node->gw_flags = batman_ogm_packet->gw_flags;



	/* restart gateway selection if fast or late switching was enabled */

	if ((orig_node->gw_flags) &&

	    (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&

	    (atomic_read(&bat_priv->gw_sel_class) > 2))

		gw_check_election(bat_priv, orig_node);



	goto out;



unlock:

	rcu_read_unlock();

out:

	if (neigh_node)

		neigh_node_free_ref(neigh_node);

	if (router)

		neigh_node_free_ref(router);

}



static int bat_ogm_calc_tq(struct orig_node *orig_node,

			   struct orig_node *orig_neigh_node,

			   struct batman_ogm_packet *batman_ogm_packet,

			   struct hard_iface *if_incoming)

{

	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);

	struct neigh_node *neigh_node = NULL, *tmp_neigh_node;

	struct hlist_node *node;

	uint8_t total_count;

	uint8_t orig_eq_count, neigh_rq_count, tq_own;

	int tq_asym_penalty, ret = 0;



	/* find corresponding one hop neighbor */

	rcu_read_lock();

	hlist_for_each_entry_rcu(tmp_neigh_node, node,

				 &orig_neigh_node->neigh_list, list) {



		if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))

			continue;



		if (tmp_neigh_node->if_incoming != if_incoming)

			continue;



		if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))

			continue;



		neigh_node = tmp_neigh_node;

		break;

	}

	rcu_read_unlock();



	if (!neigh_node)

		neigh_node = create_neighbor(orig_neigh_node,

					     orig_neigh_node,

					     orig_neigh_node->orig,

					     if_incoming);



	if (!neigh_node)

		goto out;



	/* if orig_node is direct neighbor update neigh_node last_valid */

	if (orig_node == orig_neigh_node)

		neigh_node->last_valid = jiffies;



	orig_node->last_valid = jiffies;



	/* find packet count of corresponding one hop neighbor */

	spin_lock_bh(&orig_node->ogm_cnt_lock);

	orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];

	neigh_rq_count = neigh_node->real_packet_count;

	spin_unlock_bh(&orig_node->ogm_cnt_lock);



	/* pay attention to not get a value bigger than 100 % */

	total_count = (orig_eq_count > neigh_rq_count ?

		       neigh_rq_count : orig_eq_count);



	/* if we have too few packets (too less data) we set tq_own to zero */

	/* if we receive too few packets it is not considered bidirectional */

	if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||

	    (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))

		tq_own = 0;

	else

		/* neigh_node->real_packet_count is never zero as we

		 * only purge old information when getting new

		 * information */

		tq_own = (TQ_MAX_VALUE * total_count) /	neigh_rq_count;



	/*

	 * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does

	 * affect the nearly-symmetric links only a little, but

	 * punishes asymmetric links more.  This will give a value

	 * between 0 and TQ_MAX_VALUE

	 */

	tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *

				(TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *

				(TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *

				(TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /

					(TQ_LOCAL_WINDOW_SIZE *

					 TQ_LOCAL_WINDOW_SIZE *

					 TQ_LOCAL_WINDOW_SIZE);



	batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own

							* tq_asym_penalty) /

						(TQ_MAX_VALUE * TQ_MAX_VALUE));



	bat_dbg(DBG_BATMAN, bat_priv,

		"bidirectional: "

		"orig = %-15pM neigh = %-15pM => own_bcast = %2i, "

		"real recv = %2i, local tq: %3i, asym_penalty: %3i, "

		"total tq: %3i\n",

		orig_node->orig, orig_neigh_node->orig, total_count,

		neigh_rq_count, tq_own,	tq_asym_penalty, batman_ogm_packet->tq);



	/* if link has the minimum required transmission quality

	 * consider it bidirectional */

	if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)

		ret = 1;



out:

	if (neigh_node)

		neigh_node_free_ref(neigh_node);

	return ret;

}



/* processes a batman packet for all interfaces, adjusts the sequence number and

 * finds out whether it is a duplicate.

 * returns:

 *   1 the packet is a duplicate

 *   0 the packet has not yet been received

 *  -1 the packet is old and has been received while the seqno window

 *     was protected. Caller should drop it.

 */

static int bat_ogm_update_seqnos(const struct ethhdr *ethhdr,

				 const struct batman_ogm_packet

							*batman_ogm_packet,

				 const struct hard_iface *if_incoming)

{

	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);

	struct orig_node *orig_node;

	struct neigh_node *tmp_neigh_node;

	struct hlist_node *node;

	int is_duplicate = 0;

	int32_t seq_diff;

	int need_update = 0;

	int set_mark, ret = -1;



	orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);

	if (!orig_node)

		return 0;



	spin_lock_bh(&orig_node->ogm_cnt_lock);

	seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;



	/* signalize caller that the packet is to be dropped. */

	if (window_protected(bat_priv, seq_diff,

			     &orig_node->batman_seqno_reset))

		goto out;



	rcu_read_lock();

	hlist_for_each_entry_rcu(tmp_neigh_node, node,

				 &orig_node->neigh_list, list) {



		is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,

					       orig_node->last_real_seqno,

					       batman_ogm_packet->seqno);



		if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&

		    (tmp_neigh_node->if_incoming == if_incoming))

			set_mark = 1;

		else

			set_mark = 0;



		/* if the window moved, set the update flag. */

		need_update |= bit_get_packet(bat_priv,

					      tmp_neigh_node->real_bits,

					      seq_diff, set_mark);



		tmp_neigh_node->real_packet_count =

			bit_packet_count(tmp_neigh_node->real_bits);

	}

	rcu_read_unlock();



	if (need_update) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"updating last_seqno: old %d, new %d\n",

			orig_node->last_real_seqno, batman_ogm_packet->seqno);

		orig_node->last_real_seqno = batman_ogm_packet->seqno;

	}



	ret = is_duplicate;



out:

	spin_unlock_bh(&orig_node->ogm_cnt_lock);

	orig_node_free_ref(orig_node);

	return ret;

}



static void bat_ogm_process(const struct ethhdr *ethhdr,

			    struct batman_ogm_packet *batman_ogm_packet,

			    const unsigned char *tt_buff,

			    struct hard_iface *if_incoming)

{

	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);

	struct hard_iface *hard_iface;

	struct orig_node *orig_neigh_node, *orig_node;

	struct neigh_node *router = NULL, *router_router = NULL;

	struct neigh_node *orig_neigh_router = NULL;

	int has_directlink_flag;

	int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;

	int is_broadcast = 0, is_bidirectional, is_single_hop_neigh;

	int is_duplicate;

	uint32_t if_incoming_seqno;



	/* Silently drop when the batman packet is actually not a

	 * correct packet.

	 *

	 * This might happen if a packet is padded (e.g. Ethernet has a

	 * minimum frame length of 64 byte) and the aggregation interprets

	 * it as an additional length.

	 *

	 * TODO: A more sane solution would be to have a bit in the

	 * batman_ogm_packet to detect whether the packet is the last

	 * packet in an aggregation.  Here we expect that the padding

	 * is always zero (or not 0x01)

	 */

	if (batman_ogm_packet->packet_type != BAT_OGM)

		return;



	/* could be changed by schedule_own_packet() */

	if_incoming_seqno = atomic_read(&if_incoming->seqno);



	has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);



	is_single_hop_neigh = (compare_eth(ethhdr->h_source,

					   batman_ogm_packet->orig) ? 1 : 0);



	bat_dbg(DBG_BATMAN, bat_priv,

		"Received BATMAN packet via NB: %pM, IF: %s [%pM] "

		"(from OG: %pM, via prev OG: %pM, seqno %d, ttvn %u, "

		"crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n",

		ethhdr->h_source, if_incoming->net_dev->name,

		if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,

		batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,

		batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,

		batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,

		batman_ogm_packet->ttl, batman_ogm_packet->version,

		has_directlink_flag);



	rcu_read_lock();

	list_for_each_entry_rcu(hard_iface, &hardif_list, list) {

		if (hard_iface->if_status != IF_ACTIVE)

			continue;



		if (hard_iface->soft_iface != if_incoming->soft_iface)

			continue;



		if (compare_eth(ethhdr->h_source,

				hard_iface->net_dev->dev_addr))

			is_my_addr = 1;



		if (compare_eth(batman_ogm_packet->orig,

				hard_iface->net_dev->dev_addr))

			is_my_orig = 1;



		if (compare_eth(batman_ogm_packet->prev_sender,

				hard_iface->net_dev->dev_addr))

			is_my_oldorig = 1;



		if (is_broadcast_ether_addr(ethhdr->h_source))

			is_broadcast = 1;

	}

	rcu_read_unlock();



	if (batman_ogm_packet->version != COMPAT_VERSION) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"Drop packet: incompatible batman version (%i)\n",

			batman_ogm_packet->version);

		return;

	}



	if (is_my_addr) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"Drop packet: received my own broadcast (sender: %pM"

			")\n",

			ethhdr->h_source);

		return;

	}



	if (is_broadcast) {

		bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "

		"ignoring all packets with broadcast source addr (sender: %pM"

		")\n", ethhdr->h_source);

		return;

	}



	if (is_my_orig) {

		unsigned long *word;

		int offset;



		orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);

		if (!orig_neigh_node)

			return;



		/* neighbor has to indicate direct link and it has to

		 * come via the corresponding interface */

		/* save packet seqno for bidirectional check */

		if (has_directlink_flag &&

		    compare_eth(if_incoming->net_dev->dev_addr,

				batman_ogm_packet->orig)) {

			offset = if_incoming->if_num * NUM_WORDS;



			spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);

			word = &(orig_neigh_node->bcast_own[offset]);

			bit_mark(word,

				 if_incoming_seqno -

						batman_ogm_packet->seqno - 2);

			orig_neigh_node->bcast_own_sum[if_incoming->if_num] =

				bit_packet_count(word);

			spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);

		}



		bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "

			"originator packet from myself (via neighbor)\n");

		orig_node_free_ref(orig_neigh_node);

		return;

	}



	if (is_my_oldorig) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"Drop packet: ignoring all rebroadcast echos (sender: "

			"%pM)\n", ethhdr->h_source);

		return;

	}



	orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);

	if (!orig_node)

		return;



	is_duplicate = bat_ogm_update_seqnos(ethhdr, batman_ogm_packet,

					     if_incoming);



	if (is_duplicate == -1) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"Drop packet: packet within seqno protection time "

			"(sender: %pM)\n", ethhdr->h_source);

		goto out;

	}



	if (batman_ogm_packet->tq == 0) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"Drop packet: originator packet with tq equal 0\n");

		goto out;

	}



	router = orig_node_get_router(orig_node);

	if (router)

		router_router = orig_node_get_router(router->orig_node);



	/* avoid temporary routing loops */

	if (router && router_router &&

	    (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&

	    !(compare_eth(batman_ogm_packet->orig,

			  batman_ogm_packet->prev_sender)) &&

	    (compare_eth(router->addr, router_router->addr))) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"Drop packet: ignoring all rebroadcast packets that "

			"may make me loop (sender: %pM)\n", ethhdr->h_source);

		goto out;

	}



	/* if sender is a direct neighbor the sender mac equals

	 * originator mac */

	orig_neigh_node = (is_single_hop_neigh ?

			   orig_node :

			   get_orig_node(bat_priv, ethhdr->h_source));

	if (!orig_neigh_node)

		goto out;



	orig_neigh_router = orig_node_get_router(orig_neigh_node);



	/* drop packet if sender is not a direct neighbor and if we

	 * don't route towards it */

	if (!is_single_hop_neigh && (!orig_neigh_router)) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"Drop packet: OGM via unknown neighbor!\n");

		goto out_neigh;

	}



	is_bidirectional = bat_ogm_calc_tq(orig_node, orig_neigh_node,

					   batman_ogm_packet, if_incoming);



	bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);



	/* update ranking if it is not a duplicate or has the same

	 * seqno and similar ttl as the non-duplicate */

	if (is_bidirectional &&

	    (!is_duplicate ||

	     ((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&

	      (orig_node->last_ttl - 3 <= batman_ogm_packet->ttl))))

		bat_ogm_orig_update(bat_priv, orig_node, ethhdr,

				    batman_ogm_packet, if_incoming,

				    tt_buff, is_duplicate);



	/* is single hop (direct) neighbor */

	if (is_single_hop_neigh) {



		/* mark direct link on incoming interface */

		schedule_forward_packet(orig_node, ethhdr, batman_ogm_packet,

					1, if_incoming);



		bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "

			"rebroadcast neighbor packet with direct link flag\n");

		goto out_neigh;

	}



	/* multihop originator */

	if (!is_bidirectional) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"Drop packet: not received via bidirectional link\n");

		goto out_neigh;

	}



	if (is_duplicate) {

		bat_dbg(DBG_BATMAN, bat_priv,

			"Drop packet: duplicate packet received\n");

		goto out_neigh;

	}



	bat_dbg(DBG_BATMAN, bat_priv,

		"Forwarding packet: rebroadcast originator packet\n");

	schedule_forward_packet(orig_node, ethhdr, batman_ogm_packet,

				0, if_incoming);



out_neigh:

	if ((orig_neigh_node) && (!is_single_hop_neigh))

		orig_node_free_ref(orig_neigh_node);

out:

	if (router)

		neigh_node_free_ref(router);

	if (router_router)

		neigh_node_free_ref(router_router);

	if (orig_neigh_router)

		neigh_node_free_ref(orig_neigh_router);



	orig_node_free_ref(orig_node);

}



void bat_ogm_receive(const struct ethhdr *ethhdr, unsigned char *packet_buff,

		     int packet_len, struct hard_iface *if_incoming)

{

	struct batman_ogm_packet *batman_ogm_packet;

	int buff_pos = 0;

	unsigned char *tt_buff;



	batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;



	/* unpack the aggregated packets and process them one by one */

	do {

		/* network to host order for our 32bit seqno and the

		   orig_interval */

		batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);

		batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);



		tt_buff = packet_buff + buff_pos + BATMAN_OGM_LEN;



		bat_ogm_process(ethhdr, batman_ogm_packet,

				tt_buff, if_incoming);



		buff_pos += BATMAN_OGM_LEN +

				tt_len(batman_ogm_packet->tt_num_changes);



		batman_ogm_packet = (struct batman_ogm_packet *)

						(packet_buff + buff_pos);

	} while (bat_ogm_aggr_packet(buff_pos, packet_len,

				     batman_ogm_packet->tt_num_changes));

}

net/batman-adv/bat_ogm.h

0 → 100644
+30 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2007-2011 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

 *

 */



#ifndef _NET_BATMAN_ADV_OGM_H_

#define _NET_BATMAN_ADV_OGM_H_



#include "main.h"



void bat_ogm_receive(const struct ethhdr *ethhdr, unsigned char *packet_buff,

		     int packet_len, struct hard_iface *if_incoming);



#endif /* _NET_BATMAN_ADV_OGM_H_ */