net: Add batman-adv meshing protocol

B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is a routing
protocol for multi-hop ad-hoc mesh networks. The networks may be wired or
wireless. See http://www.open-mesh.org/ for more information and user space
tools.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1397 insertions, 0 deletions

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
new file mode 100644
index 000000000000..8828eddd3f72
--- /dev/null
+++ b/net/batman-adv/routing.c
@@ -0,0 +1,1397 @@
+/*
+ * 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 "routing.h"
+#include "send.h"
+#include "hash.h"
+#include "soft-interface.h"
+#include "hard-interface.h"
+#include "icmp_socket.h"
+#include "translation-table.h"
+#include "originator.h"
+#include "types.h"
+#include "ring_buffer.h"
+#include "vis.h"
+#include "aggregation.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+#include "unicast.h"
+
+void slide_own_bcast_window(struct batman_if *batman_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+	struct hashtable_t *hash = bat_priv->orig_hash;
+	struct hlist_node *walk;
+	struct hlist_head *head;
+	struct element_t *bucket;
+	struct orig_node *orig_node;
+	unsigned long *word;
+	int i;
+	size_t word_index;
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		hlist_for_each_entry(bucket, walk, head, hlist) {
+			orig_node = bucket->data;
+			word_index = batman_if->if_num * NUM_WORDS;
+			word = &(orig_node->bcast_own[word_index]);
+
+			bit_get_packet(bat_priv, word, 1, 0);
+			orig_node->bcast_own_sum[batman_if->if_num] =
+				bit_packet_count(word);
+		}
+	}
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+}
+
+static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node,
+		       unsigned char *hna_buff, int hna_buff_len)
+{
+	if ((hna_buff_len != orig_node->hna_buff_len) ||
+	    ((hna_buff_len > 0) &&
+	     (orig_node->hna_buff_len > 0) &&
+	     (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) {
+
+		if (orig_node->hna_buff_len > 0)
+			hna_global_del_orig(bat_priv, orig_node,
+					    "originator changed hna");
+
+		if ((hna_buff_len > 0) && (hna_buff))
+			hna_global_add_orig(bat_priv, orig_node,
+					    hna_buff, hna_buff_len);
+	}
+}
+
+static void update_route(struct bat_priv *bat_priv,
+			 struct orig_node *orig_node,
+			 struct neigh_node *neigh_node,
+			 unsigned char *hna_buff, int hna_buff_len)
+{
+	/* route deleted */
+	if ((orig_node->router) && (!neigh_node)) {
+
+		bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n",
+			orig_node->orig);
+		hna_global_del_orig(bat_priv, orig_node,
+				    "originator timed out");
+
+		/* route added */
+	} else if ((!orig_node->router) && (neigh_node)) {
+
+		bat_dbg(DBG_ROUTES, bat_priv,
+			"Adding route towards: %pM (via %pM)\n",
+			orig_node->orig, neigh_node->addr);
+		hna_global_add_orig(bat_priv, orig_node,
+				    hna_buff, hna_buff_len);
+
+		/* route changed */
+	} else {
+		bat_dbg(DBG_ROUTES, bat_priv,
+			"Changing route towards: %pM "
+			"(now via %pM - was via %pM)\n",
+			orig_node->orig, neigh_node->addr,
+			orig_node->router->addr);
+	}
+
+	orig_node->router = neigh_node;
+}
+
+
+void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node,
+		   struct neigh_node *neigh_node, unsigned char *hna_buff,
+		   int hna_buff_len)
+{
+
+	if (!orig_node)
+		return;
+
+	if (orig_node->router != neigh_node)
+		update_route(bat_priv, orig_node, neigh_node,
+			     hna_buff, hna_buff_len);
+	/* may be just HNA changed */
+	else
+		update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len);
+}
+
+static int is_bidirectional_neigh(struct orig_node *orig_node,
+				struct orig_node *orig_neigh_node,
+				struct batman_packet *batman_packet,
+				struct batman_if *if_incoming)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
+	unsigned char total_count;
+
+	if (orig_node == orig_neigh_node) {
+		list_for_each_entry(tmp_neigh_node,
+				    &orig_node->neigh_list,
+				    list) {
+
+			if (compare_orig(tmp_neigh_node->addr,
+					 orig_neigh_node->orig) &&
+			    (tmp_neigh_node->if_incoming == if_incoming))
+				neigh_node = tmp_neigh_node;
+		}
+
+		if (!neigh_node)
+			neigh_node = create_neighbor(orig_node,
+						     orig_neigh_node,
+						     orig_neigh_node->orig,
+						     if_incoming);
+		/* create_neighbor failed, return 0 */
+		if (!neigh_node)
+			return 0;
+
+		neigh_node->last_valid = jiffies;
+	} else {
+		/* find packet count of corresponding one hop neighbor */
+		list_for_each_entry(tmp_neigh_node,
+				    &orig_neigh_node->neigh_list, list) {
+
+			if (compare_orig(tmp_neigh_node->addr,
+					 orig_neigh_node->orig) &&
+			    (tmp_neigh_node->if_incoming == if_incoming))
+				neigh_node = tmp_neigh_node;
+		}
+
+		if (!neigh_node)
+			neigh_node = create_neighbor(orig_neigh_node,
+						     orig_neigh_node,
+						     orig_neigh_node->orig,
+						     if_incoming);
+		/* create_neighbor failed, return 0 */
+		if (!neigh_node)
+			return 0;
+	}
+
+	orig_node->last_valid = jiffies;
+
+	/* pay attention to not get a value bigger than 100 % */
+	total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] >
+		       neigh_node->real_packet_count ?
+		       neigh_node->real_packet_count :
+		       orig_neigh_node->bcast_own_sum[if_incoming->if_num]);
+
+	/* 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_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
+		orig_neigh_node->tq_own = 0;
+	else
+		/* neigh_node->real_packet_count is never zero as we
+		 * only purge old information when getting new
+		 * information */
+		orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) /
+			neigh_node->real_packet_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
+	 */
+	orig_neigh_node->tq_asym_penalty =
+		TQ_MAX_VALUE -
+		(TQ_MAX_VALUE *
+		 (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
+		 (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
+		 (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
+		(TQ_LOCAL_WINDOW_SIZE *
+		 TQ_LOCAL_WINDOW_SIZE *
+		 TQ_LOCAL_WINDOW_SIZE);
+
+	batman_packet->tq = ((batman_packet->tq *
+			      orig_neigh_node->tq_own *
+			      orig_neigh_node->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_node->real_packet_count, orig_neigh_node->tq_own,
+		orig_neigh_node->tq_asym_penalty, batman_packet->tq);
+
+	/* if link has the minimum required transmission quality
+	 * consider it bidirectional */
+	if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
+		return 1;
+
+	return 0;
+}
+
+static void update_orig(struct bat_priv *bat_priv,
+			struct orig_node *orig_node,
+			struct ethhdr *ethhdr,
+			struct batman_packet *batman_packet,
+			struct batman_if *if_incoming,
+			unsigned char *hna_buff, int hna_buff_len,
+			char is_duplicate)
+{
+	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
+	int tmp_hna_buff_len;
+
+	bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
+		"Searching and updating originator entry of received packet\n");
+
+	list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
+		if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) &&
+		    (tmp_neigh_node->if_incoming == if_incoming)) {
+			neigh_node = tmp_neigh_node;
+			continue;
+		}
+
+		if (is_duplicate)
+			continue;
+
+		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);
+	}
+
+	if (!neigh_node) {
+		struct orig_node *orig_tmp;
+
+		orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
+		if (!orig_tmp)
+			return;
+
+		neigh_node = create_neighbor(orig_node, orig_tmp,
+					     ethhdr->h_source, if_incoming);
+		if (!neigh_node)
+			return;
+	} else
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Updating existing last-hop neighbor of originator\n");
+
+	orig_node->flags = batman_packet->flags;
+	neigh_node->last_valid = jiffies;
+
+	ring_buffer_set(neigh_node->tq_recv,
+			&neigh_node->tq_index,
+			batman_packet->tq);
+	neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
+
+	if (!is_duplicate) {
+		orig_node->last_ttl = batman_packet->ttl;
+		neigh_node->last_ttl = batman_packet->ttl;
+	}
+
+	tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ?
+			    batman_packet->num_hna * ETH_ALEN : hna_buff_len);
+
+	/* if this neighbor already is our next hop there is nothing
+	 * to change */
+	if (orig_node->router == neigh_node)
+		goto update_hna;
+
+	/* if this neighbor does not offer a better TQ we won't consider it */
+	if ((orig_node->router) &&
+	    (orig_node->router->tq_avg > neigh_node->tq_avg))
+		goto update_hna;
+
+	/* if the TQ is the same and the link not more symetric we
+	 * won't consider it either */
+	if ((orig_node->router) &&
+	     ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
+	     (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
+	      >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
+		goto update_hna;
+
+	update_routes(bat_priv, orig_node, neigh_node,
+		      hna_buff, tmp_hna_buff_len);
+	goto update_gw;
+
+update_hna:
+	update_routes(bat_priv, orig_node, orig_node->router,
+		      hna_buff, tmp_hna_buff_len);
+
+update_gw:
+	if (orig_node->gw_flags != batman_packet->gw_flags)
+		gw_node_update(bat_priv, orig_node, batman_packet->gw_flags);
+
+	orig_node->gw_flags = batman_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);
+}
+
+/* checks whether the host restarted and is in the protection time.
+ * returns:
+ *  0 if the packet is to be accepted
+ *  1 if the packet is to be ignored.
+ */
+static int window_protected(struct bat_priv *bat_priv,
+			    int32_t seq_num_diff,
+			    unsigned long *last_reset)
+{
+	if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE)
+		|| (seq_num_diff >= EXPECTED_SEQNO_RANGE)) {
+		if (time_after(jiffies, *last_reset +
+			msecs_to_jiffies(RESET_PROTECTION_MS))) {
+
+			*last_reset = jiffies;
+			bat_dbg(DBG_BATMAN, bat_priv,
+				"old packet received, start protection\n");
+
+			return 0;
+		} else
+			return 1;
+	}
+	return 0;
+}
+
+/* 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 char count_real_packets(struct ethhdr *ethhdr,
+			       struct batman_packet *batman_packet,
+			       struct batman_if *if_incoming)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct orig_node *orig_node;
+	struct neigh_node *tmp_neigh_node;
+	char is_duplicate = 0;
+	int32_t seq_diff;
+	int need_update = 0;
+	int set_mark;
+
+	orig_node = get_orig_node(bat_priv, batman_packet->orig);
+	if (!orig_node)
+		return 0;
+
+	seq_diff = batman_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))
+		return -1;
+
+	list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
+
+		is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
+					       orig_node->last_real_seqno,
+					       batman_packet->seqno);
+
+		if (compare_orig(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);
+	}
+
+	if (need_update) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"updating last_seqno: old %d, new %d\n",
+			orig_node->last_real_seqno, batman_packet->seqno);
+		orig_node->last_real_seqno = batman_packet->seqno;
+	}
+
+	return is_duplicate;
+}
+
+/* copy primary address for bonding */
+static void mark_bonding_address(struct bat_priv *bat_priv,
+				 struct orig_node *orig_node,
+				 struct orig_node *orig_neigh_node,
+				 struct batman_packet *batman_packet)
+
+{
+	if (batman_packet->flags & PRIMARIES_FIRST_HOP)
+		memcpy(orig_neigh_node->primary_addr,
+		       orig_node->orig, ETH_ALEN);
+
+	return;
+}
+
+/* mark possible bond.candidates in the neighbor list */
+void update_bonding_candidates(struct bat_priv *bat_priv,
+			       struct orig_node *orig_node)
+{
+	int candidates;
+	int interference_candidate;
+	int best_tq;
+	struct neigh_node *tmp_neigh_node, *tmp_neigh_node2;
+	struct neigh_node *first_candidate, *last_candidate;
+
+	/* update the candidates for this originator */
+	if (!orig_node->router) {
+		orig_node->bond.candidates = 0;
+		return;
+	}
+
+	best_tq = orig_node->router->tq_avg;
+
+	/* update bond.candidates */
+
+	candidates = 0;
+
+	/* mark other nodes which also received "PRIMARIES FIRST HOP" packets
+	 * as "bonding partner" */
+
+	/* first, zero the list */
+	list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
+		tmp_neigh_node->next_bond_candidate = NULL;
+	}
+
+	first_candidate = NULL;
+	last_candidate = NULL;
+	list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) {
+
+		/* only consider if it has the same primary address ...  */
+		if (memcmp(orig_node->orig,
+				tmp_neigh_node->orig_node->primary_addr,
+				ETH_ALEN) != 0)
+			continue;
+
+		/* ... and is good enough to be considered */
+		if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD)
+			continue;
+
+		/* check if we have another candidate with the same
+		 * mac address or interface. If we do, we won't
+		 * select this candidate because of possible interference. */
+
+		interference_candidate = 0;
+		list_for_each_entry(tmp_neigh_node2,
+				&orig_node->neigh_list, list) {
+
+			if (tmp_neigh_node2 == tmp_neigh_node)
+				continue;
+
+			/* we only care if the other candidate is even
+			 * considered as candidate. */
+			if (!tmp_neigh_node2->next_bond_candidate)
+				continue;
+
+
+			if ((tmp_neigh_node->if_incoming ==
+				tmp_neigh_node2->if_incoming)
+				|| (memcmp(tmp_neigh_node->addr,
+				tmp_neigh_node2->addr, ETH_ALEN) == 0)) {
+
+				interference_candidate = 1;
+				break;
+			}
+		}
+		/* don't care further if it is an interference candidate */
+		if (interference_candidate)
+			continue;
+
+		if (!first_candidate) {
+			first_candidate = tmp_neigh_node;
+			tmp_neigh_node->next_bond_candidate = first_candidate;
+		} else
+			tmp_neigh_node->next_bond_candidate = last_candidate;
+
+		last_candidate = tmp_neigh_node;
+
+		candidates++;
+	}
+
+	if (candidates > 0) {
+		first_candidate->next_bond_candidate = last_candidate;
+		orig_node->bond.selected = first_candidate;
+	}
+
+	orig_node->bond.candidates = candidates;
+}
+
+void receive_bat_packet(struct ethhdr *ethhdr,
+				struct batman_packet *batman_packet,
+				unsigned char *hna_buff, int hna_buff_len,
+				struct batman_if *if_incoming)
+{
+	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
+	struct batman_if *batman_if;
+	struct orig_node *orig_neigh_node, *orig_node;
+	char has_directlink_flag;
+	char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
+	char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
+	char 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_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_packet->packet_type != BAT_PACKET)
+		return;
+
+	/* could be changed by schedule_own_packet() */
+	if_incoming_seqno = atomic_read(&if_incoming->seqno);
+
+	has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0);
+
+	is_single_hop_neigh = (compare_orig(ethhdr->h_source,
+					    batman_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, tq %d, "
+		"TTL %d, V %d, IDF %d)\n",
+		ethhdr->h_source, if_incoming->net_dev->name,
+		if_incoming->net_dev->dev_addr, batman_packet->orig,
+		batman_packet->prev_sender, batman_packet->seqno,
+		batman_packet->tq, batman_packet->ttl, batman_packet->version,
+		has_directlink_flag);
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(batman_if, &if_list, list) {
+		if (batman_if->if_status != IF_ACTIVE)
+			continue;
+
+		if (batman_if->soft_iface != if_incoming->soft_iface)
+			continue;
+
+		if (compare_orig(ethhdr->h_source,
+				 batman_if->net_dev->dev_addr))
+			is_my_addr = 1;
+
+		if (compare_orig(batman_packet->orig,
+				 batman_if->net_dev->dev_addr))
+			is_my_orig = 1;
+
+		if (compare_orig(batman_packet->prev_sender,
+				 batman_if->net_dev->dev_addr))
+			is_my_oldorig = 1;
+
+		if (compare_orig(ethhdr->h_source, broadcast_addr))
+			is_broadcast = 1;
+	}
+	rcu_read_unlock();
+
+	if (batman_packet->version != COMPAT_VERSION) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: incompatible batman version (%i)\n",
+			batman_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 */
+		/* if received seqno equals last send seqno save new
+		 * seqno for bidirectional check */
+		if (has_directlink_flag &&
+		    compare_orig(if_incoming->net_dev->dev_addr,
+				 batman_packet->orig) &&
+		    (batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
+			offset = if_incoming->if_num * NUM_WORDS;
+			word = &(orig_neigh_node->bcast_own[offset]);
+			bit_mark(word, 0);
+			orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
+				bit_packet_count(word);
+		}
+
+		bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
+			"originator packet from myself (via neighbor)\n");
+		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_packet->orig);
+	if (!orig_node)
+		return;
+
+	is_duplicate = count_real_packets(ethhdr, batman_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);
+		return;
+	}
+
+	if (batman_packet->tq == 0) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: originator packet with tq equal 0\n");
+		return;
+	}
+
+	/* avoid temporary routing loops */
+	if ((orig_node->router) &&
+	    (orig_node->router->orig_node->router) &&
+	    (compare_orig(orig_node->router->addr,
+			  batman_packet->prev_sender)) &&
+	    !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) &&
+	    (compare_orig(orig_node->router->addr,
+			  orig_node->router->orig_node->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);
+		return;
+	}
+
+	/* 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)
+		return;
+
+	/* drop packet if sender is not a direct neighbor and if we
+	 * don't route towards it */
+	if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: OGM via unknown neighbor!\n");
+		return;
+	}
+
+	is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
+						batman_packet, if_incoming);
+
+	/* 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_packet->seqno) &&
+	      (orig_node->last_ttl - 3 <= batman_packet->ttl))))
+		update_orig(bat_priv, orig_node, ethhdr, batman_packet,
+			    if_incoming, hna_buff, hna_buff_len, is_duplicate);
+
+	mark_bonding_address(bat_priv, orig_node,
+			     orig_neigh_node, batman_packet);
+	update_bonding_candidates(bat_priv, orig_node);
+
+	/* is single hop (direct) neighbor */
+	if (is_single_hop_neigh) {
+
+		/* mark direct link on incoming interface */
+		schedule_forward_packet(orig_node, ethhdr, batman_packet,
+					1, hna_buff_len, if_incoming);
+
+		bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
+			"rebroadcast neighbor packet with direct link flag\n");
+		return;
+	}
+
+	/* multihop originator */
+	if (!is_bidirectional) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: not received via bidirectional link\n");
+		return;
+	}
+
+	if (is_duplicate) {
+		bat_dbg(DBG_BATMAN, bat_priv,
+			"Drop packet: duplicate packet received\n");
+		return;
+	}
+
+	bat_dbg(DBG_BATMAN, bat_priv,
+		"Forwarding packet: rebroadcast originator packet\n");
+	schedule_forward_packet(orig_node, ethhdr, batman_packet,
+				0, hna_buff_len, if_incoming);
+}
+
+int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface);
+	struct ethhdr *ethhdr;
+
+	/* drop packet if it has not necessary minimum size */
+	if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet))))
+		return NET_RX_DROP;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* packet with broadcast indication but unicast recipient */
+	if (!is_broadcast_ether_addr(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	/* packet with broadcast sender address */
+	if (is_broadcast_ether_addr(ethhdr->h_source))
+		return NET_RX_DROP;
+
+	/* create a copy of the skb, if needed, to modify it. */
+	if (skb_cow(skb, 0) < 0)
+		return NET_RX_DROP;
+
+	/* keep skb linear */
+	if (skb_linearize(skb) < 0)
+		return NET_RX_DROP;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	receive_aggr_bat_packet(ethhdr,
+				skb->data,
+				skb_headlen(skb),
+				batman_if);
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	kfree_skb(skb);
+	return NET_RX_SUCCESS;
+}
+
+static int recv_my_icmp_packet(struct bat_priv *bat_priv,
+			       struct sk_buff *skb, size_t icmp_len)
+{
+	struct orig_node *orig_node;
+	struct icmp_packet_rr *icmp_packet;
+	struct ethhdr *ethhdr;
+	struct batman_if *batman_if;
+	int ret;
+	uint8_t dstaddr[ETH_ALEN];
+
+	icmp_packet = (struct icmp_packet_rr *)skb->data;
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* add data to device queue */
+	if (icmp_packet->msg_type != ECHO_REQUEST) {
+		bat_socket_receive_packet(icmp_packet, icmp_len);
+		return NET_RX_DROP;
+	}
+
+	if (!bat_priv->primary_if)
+		return NET_RX_DROP;
+
+	/* answer echo request (ping) */
+	/* get routing information */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
+						   compare_orig, choose_orig,
+						   icmp_packet->orig));
+	ret = NET_RX_DROP;
+
+	if ((orig_node) && (orig_node->router)) {
+
+		/* don't lock while sending the packets ... we therefore
+		 * copy the required data before sending */
+		batman_if = orig_node->router->if_incoming;
+		memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+		/* create a copy of the skb, if needed, to modify it. */
+		if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+			return NET_RX_DROP;
+
+		icmp_packet = (struct icmp_packet_rr *)skb->data;
+		ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+		memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
+		memcpy(icmp_packet->orig,
+		       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+		icmp_packet->msg_type = ECHO_REPLY;
+		icmp_packet->ttl = TTL;
+
+		send_skb_packet(skb, batman_if, dstaddr);
+		ret = NET_RX_SUCCESS;
+
+	} else
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	return ret;
+}
+
+static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv,
+				  struct sk_buff *skb, size_t icmp_len)
+{
+	struct orig_node *orig_node;
+	struct icmp_packet *icmp_packet;
+	struct ethhdr *ethhdr;
+	struct batman_if *batman_if;
+	int ret;
+	uint8_t dstaddr[ETH_ALEN];
+
+	icmp_packet = (struct icmp_packet *)skb->data;
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* send TTL exceeded if packet is an echo request (traceroute) */
+	if (icmp_packet->msg_type != ECHO_REQUEST) {
+		pr_debug("Warning - can't forward icmp packet from %pM to "
+			 "%pM: ttl exceeded\n", icmp_packet->orig,
+			 icmp_packet->dst);
+		return NET_RX_DROP;
+	}
+
+	if (!bat_priv->primary_if)
+		return NET_RX_DROP;
+
+	/* get routing information */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)
+		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
+			       icmp_packet->orig));
+	ret = NET_RX_DROP;
+
+	if ((orig_node) && (orig_node->router)) {
+
+		/* don't lock while sending the packets ... we therefore
+		 * copy the required data before sending */
+		batman_if = orig_node->router->if_incoming;
+		memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+		/* create a copy of the skb, if needed, to modify it. */
+		if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+			return NET_RX_DROP;
+
+		icmp_packet = (struct icmp_packet *) skb->data;
+		ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+		memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN);
+		memcpy(icmp_packet->orig,
+		       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+		icmp_packet->msg_type = TTL_EXCEEDED;
+		icmp_packet->ttl = TTL;
+
+		send_skb_packet(skb, batman_if, dstaddr);
+		ret = NET_RX_SUCCESS;
+
+	} else
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	return ret;
+}
+
+
+int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct icmp_packet_rr *icmp_packet;
+	struct ethhdr *ethhdr;
+	struct orig_node *orig_node;
+	struct batman_if *batman_if;
+	int hdr_size = sizeof(struct icmp_packet);
+	int ret;
+	uint8_t dstaddr[ETH_ALEN];
+
+	/**
+	 * we truncate all incoming icmp packets if they don't match our size
+	 */
+	if (skb->len >= sizeof(struct icmp_packet_rr))
+		hdr_size = sizeof(struct icmp_packet_rr);
+
+	/* drop packet if it has not necessary minimum size */
+	if (unlikely(!pskb_may_pull(skb, hdr_size)))
+		return NET_RX_DROP;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* packet with unicast indication but broadcast recipient */
+	if (is_broadcast_ether_addr(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	/* packet with broadcast sender address */
+	if (is_broadcast_ether_addr(ethhdr->h_source))
+		return NET_RX_DROP;
+
+	/* not for me */
+	if (!is_my_mac(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	icmp_packet = (struct icmp_packet_rr *)skb->data;
+
+	/* add record route information if not full */
+	if ((hdr_size == sizeof(struct icmp_packet_rr)) &&
+	    (icmp_packet->rr_cur < BAT_RR_LEN)) {
+		memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]),
+			ethhdr->h_dest, ETH_ALEN);
+		icmp_packet->rr_cur++;
+	}
+
+	/* packet for me */
+	if (is_my_mac(icmp_packet->dst))
+		return recv_my_icmp_packet(bat_priv, skb, hdr_size);
+
+	/* TTL exceeded */
+	if (icmp_packet->ttl < 2)
+		return recv_icmp_ttl_exceeded(bat_priv, skb, hdr_size);
+
+	ret = NET_RX_DROP;
+
+	/* get routing information */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)
+		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
+			       icmp_packet->dst));
+
+	if ((orig_node) && (orig_node->router)) {
+
+		/* don't lock while sending the packets ... we therefore
+		 * copy the required data before sending */
+		batman_if = orig_node->router->if_incoming;
+		memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+		/* create a copy of the skb, if needed, to modify it. */
+		if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+			return NET_RX_DROP;
+
+		icmp_packet = (struct icmp_packet_rr *)skb->data;
+		ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+		/* decrement ttl */
+		icmp_packet->ttl--;
+
+		/* route it */
+		send_skb_packet(skb, batman_if, dstaddr);
+		ret = NET_RX_SUCCESS;
+
+	} else
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	return ret;
+}
+
+/* find a suitable router for this originator, and use
+ * bonding if possible. */
+struct neigh_node *find_router(struct bat_priv *bat_priv,
+			       struct orig_node *orig_node,
+			       struct batman_if *recv_if)
+{
+	struct orig_node *primary_orig_node;
+	struct orig_node *router_orig;
+	struct neigh_node *router, *first_candidate, *best_router;
+	static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
+	int bonding_enabled;
+
+	if (!orig_node)
+		return NULL;
+
+	if (!orig_node->router)
+		return NULL;
+
+	/* without bonding, the first node should
+	 * always choose the default router. */
+
+	bonding_enabled = atomic_read(&bat_priv->bonding);
+
+	if ((!recv_if) && (!bonding_enabled))
+		return orig_node->router;
+
+	router_orig = orig_node->router->orig_node;
+
+	/* if we have something in the primary_addr, we can search
+	 * for a potential bonding candidate. */
+	if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0)
+		return orig_node->router;
+
+	/* find the orig_node which has the primary interface. might
+	 * even be the same as our router_orig in many cases */
+
+	if (memcmp(router_orig->primary_addr,
+				router_orig->orig, ETH_ALEN) == 0) {
+		primary_orig_node = router_orig;
+	} else {
+		primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig,
+					       choose_orig,
+					       router_orig->primary_addr);
+
+		if (!primary_orig_node)
+			return orig_node->router;
+	}
+
+	/* with less than 2 candidates, we can't do any
+	 * bonding and prefer the original router. */
+
+	if (primary_orig_node->bond.candidates < 2)
+		return orig_node->router;
+
+
+	/* all nodes between should choose a candidate which
+	 * is is not on the interface where the packet came
+	 * in. */
+	first_candidate = primary_orig_node->bond.selected;
+	router = first_candidate;
+
+	if (bonding_enabled) {
+		/* in the bonding case, send the packets in a round
+		 * robin fashion over the remaining interfaces. */
+		do {
+			/* recv_if == NULL on the first node. */
+			if (router->if_incoming != recv_if)
+				break;
+
+			router = router->next_bond_candidate;
+		} while (router != first_candidate);
+
+		primary_orig_node->bond.selected = router->next_bond_candidate;
+
+	} else {
+		/* if bonding is disabled, use the best of the
+		 * remaining candidates which are not using
+		 * this interface. */
+		best_router = first_candidate;
+
+		do {
+			/* recv_if == NULL on the first node. */
+			if ((router->if_incoming != recv_if) &&
+				(router->tq_avg > best_router->tq_avg))
+					best_router = router;
+
+			router = router->next_bond_candidate;
+		} while (router != first_candidate);
+
+		router = best_router;
+	}
+
+	return router;
+}
+
+static int check_unicast_packet(struct sk_buff *skb, int hdr_size)
+{
+	struct ethhdr *ethhdr;
+
+	/* drop packet if it has not necessary minimum size */
+	if (unlikely(!pskb_may_pull(skb, hdr_size)))
+		return -1;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* packet with unicast indication but broadcast recipient */
+	if (is_broadcast_ether_addr(ethhdr->h_dest))
+		return -1;
+
+	/* packet with broadcast sender address */
+	if (is_broadcast_ether_addr(ethhdr->h_source))
+		return -1;
+
+	/* not for me */
+	if (!is_my_mac(ethhdr->h_dest))
+		return -1;
+
+	return 0;
+}
+
+int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if,
+			 int hdr_size)
+{
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct orig_node *orig_node;
+	struct neigh_node *router;
+	struct batman_if *batman_if;
+	uint8_t dstaddr[ETH_ALEN];
+	struct unicast_packet *unicast_packet;
+	struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
+	int ret;
+	struct sk_buff *new_skb;
+
+	unicast_packet = (struct unicast_packet *)skb->data;
+
+	/* TTL exceeded */
+	if (unicast_packet->ttl < 2) {
+		pr_debug("Warning - can't forward unicast packet from %pM to "
+			 "%pM: ttl exceeded\n", ethhdr->h_source,
+			 unicast_packet->dest);
+		return NET_RX_DROP;
+	}
+
+	/* get routing information */
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)
+		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
+			       unicast_packet->dest));
+
+	router = find_router(bat_priv, orig_node, recv_if);
+
+	if (!router) {
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+		return NET_RX_DROP;
+	}
+
+	/* don't lock while sending the packets ... we therefore
+	 * copy the required data before sending */
+
+	batman_if = router->if_incoming;
+	memcpy(dstaddr, router->addr, ETH_ALEN);
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+
+	/* create a copy of the skb, if needed, to modify it. */
+	if (skb_cow(skb, sizeof(struct ethhdr)) < 0)
+		return NET_RX_DROP;
+
+	unicast_packet = (struct unicast_packet *)skb->data;
+
+	if (unicast_packet->packet_type == BAT_UNICAST &&
+	    atomic_read(&bat_priv->fragmentation) &&
+	    skb->len > batman_if->net_dev->mtu)
+		return frag_send_skb(skb, bat_priv, batman_if,
+				     dstaddr);
+
+	if (unicast_packet->packet_type == BAT_UNICAST_FRAG &&
+	    2 * skb->len - hdr_size <= batman_if->net_dev->mtu) {
+
+		ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
+
+		if (ret == NET_RX_DROP)
+			return NET_RX_DROP;
+
+		/* packet was buffered for late merge */
+		if (!new_skb)
+			return NET_RX_SUCCESS;
+
+		skb = new_skb;
+		unicast_packet = (struct unicast_packet *)skb->data;
+	}
+
+	/* decrement ttl */
+	unicast_packet->ttl--;
+
+	/* route it */
+	send_skb_packet(skb, batman_if, dstaddr);
+
+	return NET_RX_SUCCESS;
+}
+
+int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct unicast_packet *unicast_packet;
+	int hdr_size = sizeof(struct unicast_packet);
+
+	if (check_unicast_packet(skb, hdr_size) < 0)
+		return NET_RX_DROP;
+
+	unicast_packet = (struct unicast_packet *)skb->data;
+
+	/* packet for me */
+	if (is_my_mac(unicast_packet->dest)) {
+		interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
+		return NET_RX_SUCCESS;
+	}
+
+	return route_unicast_packet(skb, recv_if, hdr_size);
+}
+
+int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct unicast_frag_packet *unicast_packet;
+	int hdr_size = sizeof(struct unicast_frag_packet);
+	struct sk_buff *new_skb = NULL;
+	int ret;
+
+	if (check_unicast_packet(skb, hdr_size) < 0)
+		return NET_RX_DROP;
+
+	unicast_packet = (struct unicast_frag_packet *)skb->data;
+
+	/* packet for me */
+	if (is_my_mac(unicast_packet->dest)) {
+
+		ret = frag_reassemble_skb(skb, bat_priv, &new_skb);
+
+		if (ret == NET_RX_DROP)
+			return NET_RX_DROP;
+
+		/* packet was buffered for late merge */
+		if (!new_skb)
+			return NET_RX_SUCCESS;
+
+		interface_rx(recv_if->soft_iface, new_skb, recv_if,
+			     sizeof(struct unicast_packet));
+		return NET_RX_SUCCESS;
+	}
+
+	return route_unicast_packet(skb, recv_if, hdr_size);
+}
+
+
+int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	struct orig_node *orig_node;
+	struct bcast_packet *bcast_packet;
+	struct ethhdr *ethhdr;
+	int hdr_size = sizeof(struct bcast_packet);
+	int32_t seq_diff;
+
+	/* drop packet if it has not necessary minimum size */
+	if (unlikely(!pskb_may_pull(skb, hdr_size)))
+		return NET_RX_DROP;
+
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* packet with broadcast indication but unicast recipient */
+	if (!is_broadcast_ether_addr(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	/* packet with broadcast sender address */
+	if (is_broadcast_ether_addr(ethhdr->h_source))
+		return NET_RX_DROP;
+
+	/* ignore broadcasts sent by myself */
+	if (is_my_mac(ethhdr->h_source))
+		return NET_RX_DROP;
+
+	bcast_packet = (struct bcast_packet *)skb->data;
+
+	/* ignore broadcasts originated by myself */
+	if (is_my_mac(bcast_packet->orig))
+		return NET_RX_DROP;
+
+	if (bcast_packet->ttl < 2)
+		return NET_RX_DROP;
+
+	spin_lock_bh(&bat_priv->orig_hash_lock);
+	orig_node = ((struct orig_node *)
+		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
+			       bcast_packet->orig));
+
+	if (!orig_node) {
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+		return NET_RX_DROP;
+	}
+
+	/* check whether the packet is a duplicate */
+	if (get_bit_status(orig_node->bcast_bits,
+			   orig_node->last_bcast_seqno,
+			   ntohl(bcast_packet->seqno))) {
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+		return NET_RX_DROP;
+	}
+
+	seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno;
+
+	/* check whether the packet is old and the host just restarted. */
+	if (window_protected(bat_priv, seq_diff,
+			     &orig_node->bcast_seqno_reset)) {
+		spin_unlock_bh(&bat_priv->orig_hash_lock);
+		return NET_RX_DROP;
+	}
+
+	/* mark broadcast in flood history, update window position
+	 * if required. */
+	if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1))
+		orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno);
+
+	spin_unlock_bh(&bat_priv->orig_hash_lock);
+	/* rebroadcast packet */
+	add_bcast_packet_to_list(bat_priv, skb);
+
+	/* broadcast for me */
+	interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size);
+
+	return NET_RX_SUCCESS;
+}
+
+int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if)
+{
+	struct vis_packet *vis_packet;
+	struct ethhdr *ethhdr;
+	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+	int hdr_size = sizeof(struct vis_packet);
+
+	/* keep skb linear */
+	if (skb_linearize(skb) < 0)
+		return NET_RX_DROP;
+
+	if (unlikely(!pskb_may_pull(skb, hdr_size)))
+		return NET_RX_DROP;
+
+	vis_packet = (struct vis_packet *)skb->data;
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
+
+	/* not for me */
+	if (!is_my_mac(ethhdr->h_dest))
+		return NET_RX_DROP;
+
+	/* ignore own packets */
+	if (is_my_mac(vis_packet->vis_orig))
+		return NET_RX_DROP;
+
+	if (is_my_mac(vis_packet->sender_orig))
+		return NET_RX_DROP;
+
+	switch (vis_packet->vis_type) {
+	case VIS_TYPE_SERVER_SYNC:
+		receive_server_sync_packet(bat_priv, vis_packet,
+					   skb_headlen(skb));
+		break;
+
+	case VIS_TYPE_CLIENT_UPDATE:
+		receive_client_update_packet(bat_priv, vis_packet,
+					     skb_headlen(skb));
+		break;
+
+	default:	/* ignore unknown packet */
+		break;
+	}
+
+	/* We take a copy of the data in the packet, so we should
+	   always free the skbuf. */
+	return NET_RX_DROP;
+}