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>
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
new file mode 100644
index 0000000..8828edd
--- /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;
+}