routing.c 39.2 KB
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/*
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 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
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 *
 * 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 "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];

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		rcu_read_lock();
		hlist_for_each_entry_rcu(bucket, walk, head, hlist) {
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			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);
		}
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		rcu_read_unlock();
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	}

	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)
{
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	struct neigh_node *neigh_node_tmp;

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	/* 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);
	}

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	if (neigh_node)
		kref_get(&neigh_node->refcount);
	neigh_node_tmp = orig_node->router;
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	orig_node->router = neigh_node;
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	if (neigh_node_tmp)
		kref_put(&neigh_node_tmp->refcount, neigh_node_free_ref);
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}


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;
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	struct hlist_node *node;
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	unsigned char total_count;
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	int ret = 0;
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	if (orig_node == orig_neigh_node) {
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		rcu_read_lock();
		hlist_for_each_entry_rcu(tmp_neigh_node, node,
					 &orig_node->neigh_list, list) {
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			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)
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			goto unlock;

		kref_get(&neigh_node->refcount);
		rcu_read_unlock();
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		neigh_node->last_valid = jiffies;
	} else {
		/* find packet count of corresponding one hop neighbor */
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		rcu_read_lock();
		hlist_for_each_entry_rcu(tmp_neigh_node, node,
					 &orig_neigh_node->neigh_list, list) {
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			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)
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			goto unlock;

		kref_get(&neigh_node->refcount);
		rcu_read_unlock();
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	}

	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)
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		ret = 1;

	goto out;
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unlock:
	rcu_read_unlock();
out:
	if (neigh_node)
		kref_put(&neigh_node->refcount, neigh_node_free_ref);
	return ret;
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}

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;
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	struct hlist_node *node;
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	int tmp_hna_buff_len;

	bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
		"Searching and updating originator entry of received packet\n");

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	rcu_read_lock();
	hlist_for_each_entry_rcu(tmp_neigh_node, node,
				 &orig_node->neigh_list, list) {
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		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)
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			goto unlock;
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		neigh_node = create_neighbor(orig_node, orig_tmp,
					     ethhdr->h_source, if_incoming);
		if (!neigh_node)
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			goto unlock;
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	} else
		bat_dbg(DBG_BATMAN, bat_priv,
			"Updating existing last-hop neighbor of originator\n");

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	kref_get(&neigh_node->refcount);
	rcu_read_unlock();

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	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);
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	goto out;

unlock:
	rcu_read_unlock();
out:
	if (neigh_node)
		kref_put(&neigh_node->refcount, neigh_node_free_ref);
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}

/* 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;
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	struct hlist_node *node;
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	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;

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	rcu_read_lock();
	hlist_for_each_entry_rcu(tmp_neigh_node, node,
				 &orig_node->neigh_list, list) {
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		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);
	}
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	rcu_read_unlock();
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	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 */
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static void mark_bonding_address(struct orig_node *orig_node,
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				 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 */
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void update_bonding_candidates(struct orig_node *orig_node)
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{
	int candidates;
	int interference_candidate;
	int best_tq;
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	struct hlist_node *node, *node2;
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	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 */
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	rcu_read_lock();
	hlist_for_each_entry_rcu(tmp_neigh_node, node,
				 &orig_node->neigh_list, list) {
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		tmp_neigh_node->next_bond_candidate = NULL;
	}
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	rcu_read_unlock();
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	first_candidate = NULL;
	last_candidate = NULL;
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	rcu_read_lock();
	hlist_for_each_entry_rcu(tmp_neigh_node, node,
				 &orig_node->neigh_list, list) {
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		/* 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;
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		hlist_for_each_entry_rcu(tmp_neigh_node2, node2,
					 &orig_node->neigh_list, list) {
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			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++;
	}
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	rcu_read_unlock();
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	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);

781 782
	mark_bonding_address(orig_node, orig_neigh_node, batman_packet);
	update_bonding_candidates(orig_node);
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877

	/* 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 batman_if *batman_if;
	int ret;
	uint8_t dstaddr[ETH_ALEN];

	icmp_packet = (struct icmp_packet_rr *)skb->data;

	/* 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);
878
	rcu_read_lock();
879 880 881
	orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash,
						   compare_orig, choose_orig,
						   icmp_packet->orig));
882
	rcu_read_unlock();
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914
	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;

		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,
915
				  struct sk_buff *skb)
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937
{
	struct orig_node *orig_node;
	struct icmp_packet *icmp_packet;
	struct batman_if *batman_if;
	int ret;
	uint8_t dstaddr[ETH_ALEN];

	icmp_packet = (struct icmp_packet *)skb->data;

	/* 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);
938
	rcu_read_lock();
939 940 941
	orig_node = ((struct orig_node *)
		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
			       icmp_packet->orig));
942
	rcu_read_unlock();
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	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;

		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)
1026
		return recv_icmp_ttl_exceeded(bat_priv, skb);
1027 1028 1029 1030 1031

	ret = NET_RX_DROP;

	/* get routing information */
	spin_lock_bh(&bat_priv->orig_hash_lock);
1032
	rcu_read_lock();
1033 1034 1035
	orig_node = ((struct orig_node *)
		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
			       icmp_packet->dst));
1036
	rcu_read_unlock();
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104

	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;

		/* 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 {
1105
		rcu_read_lock();
1106 1107 1108
		primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig,
					       choose_orig,
					       router_orig->primary_addr);
1109
		rcu_read_unlock();
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		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);
1212
	rcu_read_lock();
1213 1214 1215
	orig_node = ((struct orig_node *)
		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
			       unicast_packet->dest));
1216
	rcu_read_unlock();
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245

	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 &&
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	    frag_can_reassemble(skb, batman_if->net_dev->mtu)) {
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		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);
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	rcu_read_lock();
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	orig_node = ((struct orig_node *)
		     hash_find(bat_priv->orig_hash, compare_orig, choose_orig,
			       bcast_packet->orig));
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	rcu_read_unlock();
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	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;
}