2011-07-30 12:04:12 +02:00
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/*
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* Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#include "main.h"
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#include "bat_ogm.h"
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#include "translation-table.h"
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#include "ring_buffer.h"
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#include "originator.h"
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#include "routing.h"
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#include "gateway_common.h"
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#include "gateway_client.h"
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#include "hard-interface.h"
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#include "send.h"
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2011-07-30 12:33:33 +02:00
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void bat_ogm_init(struct hard_iface *hard_iface)
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{
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struct batman_ogm_packet *batman_ogm_packet;
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hard_iface->packet_len = BATMAN_OGM_LEN;
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hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
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batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
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batman_ogm_packet->packet_type = BAT_OGM;
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batman_ogm_packet->version = COMPAT_VERSION;
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batman_ogm_packet->flags = NO_FLAGS;
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batman_ogm_packet->ttl = 2;
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batman_ogm_packet->tq = TQ_MAX_VALUE;
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batman_ogm_packet->tt_num_changes = 0;
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batman_ogm_packet->ttvn = 0;
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}
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void bat_ogm_init_primary(struct hard_iface *hard_iface)
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{
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struct batman_ogm_packet *batman_ogm_packet;
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batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
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batman_ogm_packet->flags = PRIMARIES_FIRST_HOP;
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batman_ogm_packet->ttl = TTL;
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}
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void bat_ogm_update_mac(struct hard_iface *hard_iface)
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{
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struct batman_ogm_packet *batman_ogm_packet;
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batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
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memcpy(batman_ogm_packet->orig,
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hard_iface->net_dev->dev_addr, ETH_ALEN);
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memcpy(batman_ogm_packet->prev_sender,
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hard_iface->net_dev->dev_addr, ETH_ALEN);
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}
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2011-07-30 12:04:12 +02:00
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/* is there another aggregated packet here? */
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static int bat_ogm_aggr_packet(int buff_pos, int packet_len,
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int tt_num_changes)
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{
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int next_buff_pos = buff_pos + BATMAN_OGM_LEN + tt_len(tt_num_changes);
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return (next_buff_pos <= packet_len) &&
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(next_buff_pos <= MAX_AGGREGATION_BYTES);
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}
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static void bat_ogm_orig_update(struct bat_priv *bat_priv,
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struct orig_node *orig_node,
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const struct ethhdr *ethhdr,
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const struct batman_ogm_packet
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*batman_ogm_packet,
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struct hard_iface *if_incoming,
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const unsigned char *tt_buff, int is_duplicate)
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{
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struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
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struct neigh_node *router = NULL;
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struct orig_node *orig_node_tmp;
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struct hlist_node *node;
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uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
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bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
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"Searching and updating originator entry of received packet\n");
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rcu_read_lock();
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hlist_for_each_entry_rcu(tmp_neigh_node, node,
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&orig_node->neigh_list, list) {
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if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
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(tmp_neigh_node->if_incoming == if_incoming) &&
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atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
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if (neigh_node)
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neigh_node_free_ref(neigh_node);
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neigh_node = tmp_neigh_node;
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continue;
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}
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if (is_duplicate)
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continue;
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spin_lock_bh(&tmp_neigh_node->tq_lock);
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ring_buffer_set(tmp_neigh_node->tq_recv,
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&tmp_neigh_node->tq_index, 0);
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tmp_neigh_node->tq_avg =
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ring_buffer_avg(tmp_neigh_node->tq_recv);
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spin_unlock_bh(&tmp_neigh_node->tq_lock);
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}
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if (!neigh_node) {
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struct orig_node *orig_tmp;
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orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
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if (!orig_tmp)
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goto unlock;
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neigh_node = create_neighbor(orig_node, orig_tmp,
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ethhdr->h_source, if_incoming);
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orig_node_free_ref(orig_tmp);
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if (!neigh_node)
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goto unlock;
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} else
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bat_dbg(DBG_BATMAN, bat_priv,
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"Updating existing last-hop neighbor of originator\n");
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rcu_read_unlock();
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orig_node->flags = batman_ogm_packet->flags;
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neigh_node->last_valid = jiffies;
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spin_lock_bh(&neigh_node->tq_lock);
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ring_buffer_set(neigh_node->tq_recv,
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&neigh_node->tq_index,
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batman_ogm_packet->tq);
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neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
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spin_unlock_bh(&neigh_node->tq_lock);
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if (!is_duplicate) {
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orig_node->last_ttl = batman_ogm_packet->ttl;
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neigh_node->last_ttl = batman_ogm_packet->ttl;
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}
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bonding_candidate_add(orig_node, neigh_node);
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/* if this neighbor already is our next hop there is nothing
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* to change */
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router = orig_node_get_router(orig_node);
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if (router == neigh_node)
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goto update_tt;
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/* if this neighbor does not offer a better TQ we won't consider it */
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if (router && (router->tq_avg > neigh_node->tq_avg))
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goto update_tt;
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/* if the TQ is the same and the link not more symmetric we
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* won't consider it either */
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if (router && (neigh_node->tq_avg == router->tq_avg)) {
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orig_node_tmp = router->orig_node;
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spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
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bcast_own_sum_orig =
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orig_node_tmp->bcast_own_sum[if_incoming->if_num];
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spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
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orig_node_tmp = neigh_node->orig_node;
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spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
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bcast_own_sum_neigh =
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orig_node_tmp->bcast_own_sum[if_incoming->if_num];
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spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
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if (bcast_own_sum_orig >= bcast_own_sum_neigh)
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goto update_tt;
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}
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update_route(bat_priv, orig_node, neigh_node);
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update_tt:
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/* I have to check for transtable changes only if the OGM has been
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* sent through a primary interface */
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if (((batman_ogm_packet->orig != ethhdr->h_source) &&
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(batman_ogm_packet->ttl > 2)) ||
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(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
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tt_update_orig(bat_priv, orig_node, tt_buff,
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batman_ogm_packet->tt_num_changes,
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batman_ogm_packet->ttvn,
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batman_ogm_packet->tt_crc);
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if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
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gw_node_update(bat_priv, orig_node,
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batman_ogm_packet->gw_flags);
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orig_node->gw_flags = batman_ogm_packet->gw_flags;
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/* restart gateway selection if fast or late switching was enabled */
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if ((orig_node->gw_flags) &&
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(atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
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(atomic_read(&bat_priv->gw_sel_class) > 2))
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gw_check_election(bat_priv, orig_node);
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goto out;
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unlock:
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rcu_read_unlock();
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out:
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if (neigh_node)
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neigh_node_free_ref(neigh_node);
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if (router)
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neigh_node_free_ref(router);
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}
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static int bat_ogm_calc_tq(struct orig_node *orig_node,
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struct orig_node *orig_neigh_node,
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struct batman_ogm_packet *batman_ogm_packet,
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struct hard_iface *if_incoming)
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{
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struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
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struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
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struct hlist_node *node;
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uint8_t total_count;
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uint8_t orig_eq_count, neigh_rq_count, tq_own;
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int tq_asym_penalty, ret = 0;
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/* find corresponding one hop neighbor */
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rcu_read_lock();
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hlist_for_each_entry_rcu(tmp_neigh_node, node,
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&orig_neigh_node->neigh_list, list) {
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if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
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continue;
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if (tmp_neigh_node->if_incoming != if_incoming)
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continue;
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if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
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continue;
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neigh_node = tmp_neigh_node;
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break;
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}
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rcu_read_unlock();
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if (!neigh_node)
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neigh_node = create_neighbor(orig_neigh_node,
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orig_neigh_node,
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orig_neigh_node->orig,
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if_incoming);
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if (!neigh_node)
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goto out;
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/* if orig_node is direct neighbor update neigh_node last_valid */
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if (orig_node == orig_neigh_node)
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neigh_node->last_valid = jiffies;
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orig_node->last_valid = jiffies;
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/* find packet count of corresponding one hop neighbor */
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spin_lock_bh(&orig_node->ogm_cnt_lock);
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orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
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neigh_rq_count = neigh_node->real_packet_count;
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spin_unlock_bh(&orig_node->ogm_cnt_lock);
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/* pay attention to not get a value bigger than 100 % */
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total_count = (orig_eq_count > neigh_rq_count ?
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neigh_rq_count : orig_eq_count);
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/* if we have too few packets (too less data) we set tq_own to zero */
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/* if we receive too few packets it is not considered bidirectional */
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if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
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(neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
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tq_own = 0;
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else
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/* neigh_node->real_packet_count is never zero as we
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* only purge old information when getting new
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* information */
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tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count;
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/*
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* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
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* affect the nearly-symmetric links only a little, but
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* punishes asymmetric links more. This will give a value
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* between 0 and TQ_MAX_VALUE
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*/
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tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
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(TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
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(TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
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(TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
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(TQ_LOCAL_WINDOW_SIZE *
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TQ_LOCAL_WINDOW_SIZE *
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TQ_LOCAL_WINDOW_SIZE);
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batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
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* tq_asym_penalty) /
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(TQ_MAX_VALUE * TQ_MAX_VALUE));
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bat_dbg(DBG_BATMAN, bat_priv,
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"bidirectional: "
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"orig = %-15pM neigh = %-15pM => own_bcast = %2i, "
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"real recv = %2i, local tq: %3i, asym_penalty: %3i, "
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"total tq: %3i\n",
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orig_node->orig, orig_neigh_node->orig, total_count,
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neigh_rq_count, tq_own, tq_asym_penalty, batman_ogm_packet->tq);
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/* if link has the minimum required transmission quality
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* consider it bidirectional */
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if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
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ret = 1;
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out:
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if (neigh_node)
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neigh_node_free_ref(neigh_node);
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return ret;
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}
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/* processes a batman packet for all interfaces, adjusts the sequence number and
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* finds out whether it is a duplicate.
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* returns:
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* 1 the packet is a duplicate
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* 0 the packet has not yet been received
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* -1 the packet is old and has been received while the seqno window
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* was protected. Caller should drop it.
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*/
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static int bat_ogm_update_seqnos(const struct ethhdr *ethhdr,
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const struct batman_ogm_packet
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|
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*batman_ogm_packet,
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|
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const struct hard_iface *if_incoming)
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{
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struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
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|
|
struct orig_node *orig_node;
|
|
|
|
struct neigh_node *tmp_neigh_node;
|
|
|
|
struct hlist_node *node;
|
|
|
|
int is_duplicate = 0;
|
|
|
|
int32_t seq_diff;
|
|
|
|
int need_update = 0;
|
|
|
|
int set_mark, ret = -1;
|
|
|
|
|
|
|
|
orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
|
|
|
|
if (!orig_node)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
spin_lock_bh(&orig_node->ogm_cnt_lock);
|
|
|
|
seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;
|
|
|
|
|
|
|
|
/* signalize caller that the packet is to be dropped. */
|
|
|
|
if (window_protected(bat_priv, seq_diff,
|
|
|
|
&orig_node->batman_seqno_reset))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
rcu_read_lock();
|
|
|
|
hlist_for_each_entry_rcu(tmp_neigh_node, node,
|
|
|
|
&orig_node->neigh_list, list) {
|
|
|
|
|
|
|
|
is_duplicate |= get_bit_status(tmp_neigh_node->real_bits,
|
|
|
|
orig_node->last_real_seqno,
|
|
|
|
batman_ogm_packet->seqno);
|
|
|
|
|
|
|
|
if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
|
|
|
|
(tmp_neigh_node->if_incoming == if_incoming))
|
|
|
|
set_mark = 1;
|
|
|
|
else
|
|
|
|
set_mark = 0;
|
|
|
|
|
|
|
|
/* if the window moved, set the update flag. */
|
|
|
|
need_update |= bit_get_packet(bat_priv,
|
|
|
|
tmp_neigh_node->real_bits,
|
|
|
|
seq_diff, set_mark);
|
|
|
|
|
|
|
|
tmp_neigh_node->real_packet_count =
|
|
|
|
bit_packet_count(tmp_neigh_node->real_bits);
|
|
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
|
|
|
|
if (need_update) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"updating last_seqno: old %d, new %d\n",
|
|
|
|
orig_node->last_real_seqno, batman_ogm_packet->seqno);
|
|
|
|
orig_node->last_real_seqno = batman_ogm_packet->seqno;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = is_duplicate;
|
|
|
|
|
|
|
|
out:
|
|
|
|
spin_unlock_bh(&orig_node->ogm_cnt_lock);
|
|
|
|
orig_node_free_ref(orig_node);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void bat_ogm_process(const struct ethhdr *ethhdr,
|
|
|
|
struct batman_ogm_packet *batman_ogm_packet,
|
|
|
|
const unsigned char *tt_buff,
|
|
|
|
struct hard_iface *if_incoming)
|
|
|
|
{
|
|
|
|
struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
|
|
struct hard_iface *hard_iface;
|
|
|
|
struct orig_node *orig_neigh_node, *orig_node;
|
|
|
|
struct neigh_node *router = NULL, *router_router = NULL;
|
|
|
|
struct neigh_node *orig_neigh_router = NULL;
|
|
|
|
int has_directlink_flag;
|
|
|
|
int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
|
|
|
|
int is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
|
|
|
|
int is_duplicate;
|
|
|
|
uint32_t if_incoming_seqno;
|
|
|
|
|
|
|
|
/* Silently drop when the batman packet is actually not a
|
|
|
|
* correct packet.
|
|
|
|
*
|
|
|
|
* This might happen if a packet is padded (e.g. Ethernet has a
|
|
|
|
* minimum frame length of 64 byte) and the aggregation interprets
|
|
|
|
* it as an additional length.
|
|
|
|
*
|
|
|
|
* TODO: A more sane solution would be to have a bit in the
|
|
|
|
* batman_ogm_packet to detect whether the packet is the last
|
|
|
|
* packet in an aggregation. Here we expect that the padding
|
|
|
|
* is always zero (or not 0x01)
|
|
|
|
*/
|
|
|
|
if (batman_ogm_packet->packet_type != BAT_OGM)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* could be changed by schedule_own_packet() */
|
|
|
|
if_incoming_seqno = atomic_read(&if_incoming->seqno);
|
|
|
|
|
|
|
|
has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);
|
|
|
|
|
|
|
|
is_single_hop_neigh = (compare_eth(ethhdr->h_source,
|
|
|
|
batman_ogm_packet->orig) ? 1 : 0);
|
|
|
|
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Received BATMAN packet via NB: %pM, IF: %s [%pM] "
|
|
|
|
"(from OG: %pM, via prev OG: %pM, seqno %d, ttvn %u, "
|
|
|
|
"crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n",
|
|
|
|
ethhdr->h_source, if_incoming->net_dev->name,
|
|
|
|
if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
|
|
|
|
batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,
|
|
|
|
batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,
|
|
|
|
batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
|
|
|
|
batman_ogm_packet->ttl, batman_ogm_packet->version,
|
|
|
|
has_directlink_flag);
|
|
|
|
|
|
|
|
rcu_read_lock();
|
|
|
|
list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
|
|
|
|
if (hard_iface->if_status != IF_ACTIVE)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (hard_iface->soft_iface != if_incoming->soft_iface)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (compare_eth(ethhdr->h_source,
|
|
|
|
hard_iface->net_dev->dev_addr))
|
|
|
|
is_my_addr = 1;
|
|
|
|
|
|
|
|
if (compare_eth(batman_ogm_packet->orig,
|
|
|
|
hard_iface->net_dev->dev_addr))
|
|
|
|
is_my_orig = 1;
|
|
|
|
|
|
|
|
if (compare_eth(batman_ogm_packet->prev_sender,
|
|
|
|
hard_iface->net_dev->dev_addr))
|
|
|
|
is_my_oldorig = 1;
|
|
|
|
|
|
|
|
if (is_broadcast_ether_addr(ethhdr->h_source))
|
|
|
|
is_broadcast = 1;
|
|
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
|
|
|
|
if (batman_ogm_packet->version != COMPAT_VERSION) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Drop packet: incompatible batman version (%i)\n",
|
|
|
|
batman_ogm_packet->version);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (is_my_addr) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Drop packet: received my own broadcast (sender: %pM"
|
|
|
|
")\n",
|
|
|
|
ethhdr->h_source);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (is_broadcast) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
|
|
|
|
"ignoring all packets with broadcast source addr (sender: %pM"
|
|
|
|
")\n", ethhdr->h_source);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (is_my_orig) {
|
|
|
|
unsigned long *word;
|
|
|
|
int offset;
|
|
|
|
|
|
|
|
orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
|
|
|
|
if (!orig_neigh_node)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* neighbor has to indicate direct link and it has to
|
|
|
|
* come via the corresponding interface */
|
|
|
|
/* save packet seqno for bidirectional check */
|
|
|
|
if (has_directlink_flag &&
|
|
|
|
compare_eth(if_incoming->net_dev->dev_addr,
|
|
|
|
batman_ogm_packet->orig)) {
|
|
|
|
offset = if_incoming->if_num * NUM_WORDS;
|
|
|
|
|
|
|
|
spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
|
|
|
|
word = &(orig_neigh_node->bcast_own[offset]);
|
|
|
|
bit_mark(word,
|
|
|
|
if_incoming_seqno -
|
|
|
|
batman_ogm_packet->seqno - 2);
|
|
|
|
orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
|
|
|
|
bit_packet_count(word);
|
|
|
|
spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
|
|
|
|
"originator packet from myself (via neighbor)\n");
|
|
|
|
orig_node_free_ref(orig_neigh_node);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (is_my_oldorig) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Drop packet: ignoring all rebroadcast echos (sender: "
|
|
|
|
"%pM)\n", ethhdr->h_source);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
|
|
|
|
if (!orig_node)
|
|
|
|
return;
|
|
|
|
|
|
|
|
is_duplicate = bat_ogm_update_seqnos(ethhdr, batman_ogm_packet,
|
|
|
|
if_incoming);
|
|
|
|
|
|
|
|
if (is_duplicate == -1) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Drop packet: packet within seqno protection time "
|
|
|
|
"(sender: %pM)\n", ethhdr->h_source);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (batman_ogm_packet->tq == 0) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Drop packet: originator packet with tq equal 0\n");
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
router = orig_node_get_router(orig_node);
|
|
|
|
if (router)
|
|
|
|
router_router = orig_node_get_router(router->orig_node);
|
|
|
|
|
|
|
|
/* avoid temporary routing loops */
|
|
|
|
if (router && router_router &&
|
|
|
|
(compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
|
|
|
|
!(compare_eth(batman_ogm_packet->orig,
|
|
|
|
batman_ogm_packet->prev_sender)) &&
|
|
|
|
(compare_eth(router->addr, router_router->addr))) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Drop packet: ignoring all rebroadcast packets that "
|
|
|
|
"may make me loop (sender: %pM)\n", ethhdr->h_source);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* if sender is a direct neighbor the sender mac equals
|
|
|
|
* originator mac */
|
|
|
|
orig_neigh_node = (is_single_hop_neigh ?
|
|
|
|
orig_node :
|
|
|
|
get_orig_node(bat_priv, ethhdr->h_source));
|
|
|
|
if (!orig_neigh_node)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
orig_neigh_router = orig_node_get_router(orig_neigh_node);
|
|
|
|
|
|
|
|
/* drop packet if sender is not a direct neighbor and if we
|
|
|
|
* don't route towards it */
|
|
|
|
if (!is_single_hop_neigh && (!orig_neigh_router)) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Drop packet: OGM via unknown neighbor!\n");
|
|
|
|
goto out_neigh;
|
|
|
|
}
|
|
|
|
|
|
|
|
is_bidirectional = bat_ogm_calc_tq(orig_node, orig_neigh_node,
|
|
|
|
batman_ogm_packet, if_incoming);
|
|
|
|
|
|
|
|
bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);
|
|
|
|
|
|
|
|
/* update ranking if it is not a duplicate or has the same
|
|
|
|
* seqno and similar ttl as the non-duplicate */
|
|
|
|
if (is_bidirectional &&
|
|
|
|
(!is_duplicate ||
|
|
|
|
((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&
|
|
|
|
(orig_node->last_ttl - 3 <= batman_ogm_packet->ttl))))
|
|
|
|
bat_ogm_orig_update(bat_priv, orig_node, ethhdr,
|
|
|
|
batman_ogm_packet, if_incoming,
|
|
|
|
tt_buff, is_duplicate);
|
|
|
|
|
|
|
|
/* is single hop (direct) neighbor */
|
|
|
|
if (is_single_hop_neigh) {
|
|
|
|
|
|
|
|
/* mark direct link on incoming interface */
|
|
|
|
schedule_forward_packet(orig_node, ethhdr, batman_ogm_packet,
|
|
|
|
1, if_incoming);
|
|
|
|
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
|
|
|
|
"rebroadcast neighbor packet with direct link flag\n");
|
|
|
|
goto out_neigh;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* multihop originator */
|
|
|
|
if (!is_bidirectional) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Drop packet: not received via bidirectional link\n");
|
|
|
|
goto out_neigh;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (is_duplicate) {
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Drop packet: duplicate packet received\n");
|
|
|
|
goto out_neigh;
|
|
|
|
}
|
|
|
|
|
|
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
|
|
"Forwarding packet: rebroadcast originator packet\n");
|
|
|
|
schedule_forward_packet(orig_node, ethhdr, batman_ogm_packet,
|
|
|
|
0, if_incoming);
|
|
|
|
|
|
|
|
out_neigh:
|
|
|
|
if ((orig_neigh_node) && (!is_single_hop_neigh))
|
|
|
|
orig_node_free_ref(orig_neigh_node);
|
|
|
|
out:
|
|
|
|
if (router)
|
|
|
|
neigh_node_free_ref(router);
|
|
|
|
if (router_router)
|
|
|
|
neigh_node_free_ref(router_router);
|
|
|
|
if (orig_neigh_router)
|
|
|
|
neigh_node_free_ref(orig_neigh_router);
|
|
|
|
|
|
|
|
orig_node_free_ref(orig_node);
|
|
|
|
}
|
|
|
|
|
|
|
|
void bat_ogm_receive(const struct ethhdr *ethhdr, unsigned char *packet_buff,
|
|
|
|
int packet_len, struct hard_iface *if_incoming)
|
|
|
|
{
|
|
|
|
struct batman_ogm_packet *batman_ogm_packet;
|
|
|
|
int buff_pos = 0;
|
|
|
|
unsigned char *tt_buff;
|
|
|
|
|
|
|
|
batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
|
|
|
|
|
|
|
|
/* unpack the aggregated packets and process them one by one */
|
|
|
|
do {
|
|
|
|
/* network to host order for our 32bit seqno and the
|
|
|
|
orig_interval */
|
|
|
|
batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);
|
|
|
|
batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);
|
|
|
|
|
|
|
|
tt_buff = packet_buff + buff_pos + BATMAN_OGM_LEN;
|
|
|
|
|
|
|
|
bat_ogm_process(ethhdr, batman_ogm_packet,
|
|
|
|
tt_buff, if_incoming);
|
|
|
|
|
|
|
|
buff_pos += BATMAN_OGM_LEN +
|
|
|
|
tt_len(batman_ogm_packet->tt_num_changes);
|
|
|
|
|
|
|
|
batman_ogm_packet = (struct batman_ogm_packet *)
|
|
|
|
(packet_buff + buff_pos);
|
|
|
|
} while (bat_ogm_aggr_packet(buff_pos, packet_len,
|
|
|
|
batman_ogm_packet->tt_num_changes));
|
|
|
|
}
|