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: Marek Lindner <lindner_marek@yahoo.de>

1 files changed, 639 insertions, 0 deletions

diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
new file mode 100644
index 000000000000..6fa2d465b6cd
--- /dev/null
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -0,0 +1,639 @@
+/*
+ * 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));
+}