Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
1343 lines
41 KiB
C
1343 lines
41 KiB
C
/* Copyright (C) 2007-2012 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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#include "main.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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#include "bat_algo.h"
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static struct batadv_neigh_node *
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batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
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const uint8_t *neigh_addr,
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struct batadv_orig_node *orig_node,
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struct batadv_orig_node *orig_neigh, __be32 seqno)
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{
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struct batadv_neigh_node *neigh_node;
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neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr,
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ntohl(seqno));
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if (!neigh_node)
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goto out;
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INIT_LIST_HEAD(&neigh_node->bonding_list);
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neigh_node->orig_node = orig_neigh;
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neigh_node->if_incoming = hard_iface;
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spin_lock_bh(&orig_node->neigh_list_lock);
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hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
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spin_unlock_bh(&orig_node->neigh_list_lock);
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out:
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return neigh_node;
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}
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static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
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{
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struct batadv_ogm_packet *batadv_ogm_packet;
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unsigned char *ogm_buff;
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uint32_t random_seqno;
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int res = -ENOMEM;
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/* randomize initial seqno to avoid collision */
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get_random_bytes(&random_seqno, sizeof(random_seqno));
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atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
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hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
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ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
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if (!ogm_buff)
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goto out;
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hard_iface->bat_iv.ogm_buff = ogm_buff;
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batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
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batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
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batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
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batadv_ogm_packet->header.ttl = 2;
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batadv_ogm_packet->flags = BATADV_NO_FLAGS;
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batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
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batadv_ogm_packet->tt_num_changes = 0;
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batadv_ogm_packet->ttvn = 0;
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res = 0;
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out:
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return res;
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}
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static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
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{
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kfree(hard_iface->bat_iv.ogm_buff);
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hard_iface->bat_iv.ogm_buff = NULL;
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}
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static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
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{
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struct batadv_ogm_packet *batadv_ogm_packet;
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unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
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batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
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memcpy(batadv_ogm_packet->orig,
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hard_iface->net_dev->dev_addr, ETH_ALEN);
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memcpy(batadv_ogm_packet->prev_sender,
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hard_iface->net_dev->dev_addr, ETH_ALEN);
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}
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static void
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batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
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{
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struct batadv_ogm_packet *batadv_ogm_packet;
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unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
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batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
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batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
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batadv_ogm_packet->header.ttl = BATADV_TTL;
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}
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/* when do we schedule our own ogm to be sent */
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static unsigned long
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batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
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{
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unsigned int msecs;
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msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
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msecs += random32() % (2 * BATADV_JITTER);
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return jiffies + msecs_to_jiffies(msecs);
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}
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/* when do we schedule a ogm packet to be sent */
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static unsigned long batadv_iv_ogm_fwd_send_time(void)
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{
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return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2));
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}
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/* apply hop penalty for a normal link */
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static uint8_t batadv_hop_penalty(uint8_t tq,
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const struct batadv_priv *bat_priv)
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{
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int hop_penalty = atomic_read(&bat_priv->hop_penalty);
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int new_tq;
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new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
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new_tq /= BATADV_TQ_MAX_VALUE;
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return new_tq;
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}
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/* is there another aggregated packet here? */
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static int batadv_iv_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 = 0;
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next_buff_pos += buff_pos + BATADV_OGM_HLEN;
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next_buff_pos += batadv_tt_len(tt_num_changes);
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return (next_buff_pos <= packet_len) &&
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(next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
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}
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/* send a batman ogm to a given interface */
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static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
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struct batadv_hard_iface *hard_iface)
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{
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struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
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char *fwd_str;
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uint8_t packet_num;
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int16_t buff_pos;
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struct batadv_ogm_packet *batadv_ogm_packet;
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struct sk_buff *skb;
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uint8_t *packet_pos;
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if (hard_iface->if_status != BATADV_IF_ACTIVE)
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return;
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packet_num = 0;
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buff_pos = 0;
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packet_pos = forw_packet->skb->data;
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batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
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/* adjust all flags and log packets */
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while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
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batadv_ogm_packet->tt_num_changes)) {
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/* we might have aggregated direct link packets with an
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* ordinary base packet
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*/
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if (forw_packet->direct_link_flags & BIT(packet_num) &&
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forw_packet->if_incoming == hard_iface)
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batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
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else
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batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
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if (packet_num > 0 || !forw_packet->own)
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fwd_str = "Forwarding";
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else
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fwd_str = "Sending own";
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
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fwd_str, (packet_num > 0 ? "aggregated " : ""),
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batadv_ogm_packet->orig,
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ntohl(batadv_ogm_packet->seqno),
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batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
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(batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
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"on" : "off"),
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batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
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hard_iface->net_dev->dev_addr);
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buff_pos += BATADV_OGM_HLEN;
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buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
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packet_num++;
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packet_pos = forw_packet->skb->data + buff_pos;
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batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
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}
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/* create clone because function is called more than once */
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skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
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if (skb) {
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batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
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batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
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skb->len + ETH_HLEN);
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batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
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}
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}
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/* send a batman ogm packet */
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static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
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{
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struct batadv_hard_iface *hard_iface;
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struct net_device *soft_iface;
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struct batadv_priv *bat_priv;
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struct batadv_hard_iface *primary_if = NULL;
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struct batadv_ogm_packet *batadv_ogm_packet;
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unsigned char directlink;
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uint8_t *packet_pos;
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packet_pos = forw_packet->skb->data;
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batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
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directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
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if (!forw_packet->if_incoming) {
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pr_err("Error - can't forward packet: incoming iface not specified\n");
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goto out;
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}
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soft_iface = forw_packet->if_incoming->soft_iface;
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bat_priv = netdev_priv(soft_iface);
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if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
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goto out;
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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goto out;
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/* multihomed peer assumed
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* non-primary OGMs are only broadcasted on their interface
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*/
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if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
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(forw_packet->own && (forw_packet->if_incoming != primary_if))) {
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/* FIXME: what about aggregated packets ? */
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
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(forw_packet->own ? "Sending own" : "Forwarding"),
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batadv_ogm_packet->orig,
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ntohl(batadv_ogm_packet->seqno),
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batadv_ogm_packet->header.ttl,
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forw_packet->if_incoming->net_dev->name,
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forw_packet->if_incoming->net_dev->dev_addr);
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/* skb is only used once and than forw_packet is free'd */
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batadv_send_skb_packet(forw_packet->skb,
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forw_packet->if_incoming,
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batadv_broadcast_addr);
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forw_packet->skb = NULL;
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goto out;
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}
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/* broadcast on every interface */
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rcu_read_lock();
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list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
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if (hard_iface->soft_iface != soft_iface)
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continue;
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batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
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}
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rcu_read_unlock();
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out:
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if (primary_if)
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batadv_hardif_free_ref(primary_if);
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}
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/* return true if new_packet can be aggregated with forw_packet */
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static bool
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batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
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struct batadv_priv *bat_priv,
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int packet_len, unsigned long send_time,
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bool directlink,
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const struct batadv_hard_iface *if_incoming,
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const struct batadv_forw_packet *forw_packet)
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{
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struct batadv_ogm_packet *batadv_ogm_packet;
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int aggregated_bytes = forw_packet->packet_len + packet_len;
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struct batadv_hard_iface *primary_if = NULL;
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bool res = false;
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unsigned long aggregation_end_time;
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batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
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aggregation_end_time = send_time;
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aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
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/* we can aggregate the current packet to this aggregated packet
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* if:
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*
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* - the send time is within our MAX_AGGREGATION_MS time
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* - the resulting packet wont be bigger than
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* MAX_AGGREGATION_BYTES
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*/
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if (time_before(send_time, forw_packet->send_time) &&
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time_after_eq(aggregation_end_time, forw_packet->send_time) &&
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(aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
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/* check aggregation compatibility
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* -> direct link packets are broadcasted on
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* their interface only
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* -> aggregate packet if the current packet is
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* a "global" packet as well as the base
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* packet
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*/
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primary_if = batadv_primary_if_get_selected(bat_priv);
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if (!primary_if)
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goto out;
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/* packets without direct link flag and high TTL
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* are flooded through the net
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*/
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if ((!directlink) &&
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(!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
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(batadv_ogm_packet->header.ttl != 1) &&
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/* own packets originating non-primary
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* interfaces leave only that interface
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*/
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((!forw_packet->own) ||
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(forw_packet->if_incoming == primary_if))) {
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res = true;
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goto out;
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}
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/* if the incoming packet is sent via this one
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* interface only - we still can aggregate
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*/
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if ((directlink) &&
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(new_bat_ogm_packet->header.ttl == 1) &&
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(forw_packet->if_incoming == if_incoming) &&
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/* packets from direct neighbors or
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* own secondary interface packets
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* (= secondary interface packets in general)
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*/
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(batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
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(forw_packet->own &&
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forw_packet->if_incoming != primary_if))) {
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res = true;
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goto out;
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}
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}
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out:
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if (primary_if)
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batadv_hardif_free_ref(primary_if);
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return res;
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}
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/* create a new aggregated packet and add this packet to it */
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static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
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int packet_len, unsigned long send_time,
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bool direct_link,
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struct batadv_hard_iface *if_incoming,
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int own_packet)
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{
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struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
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struct batadv_forw_packet *forw_packet_aggr;
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unsigned char *skb_buff;
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unsigned int skb_size;
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if (!atomic_inc_not_zero(&if_incoming->refcount))
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return;
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/* own packet should always be scheduled */
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if (!own_packet) {
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if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"batman packet queue full\n");
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goto out;
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}
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}
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|
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forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
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if (!forw_packet_aggr) {
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if (!own_packet)
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atomic_inc(&bat_priv->batman_queue_left);
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goto out;
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}
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if ((atomic_read(&bat_priv->aggregated_ogms)) &&
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(packet_len < BATADV_MAX_AGGREGATION_BYTES))
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skb_size = BATADV_MAX_AGGREGATION_BYTES;
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else
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skb_size = packet_len;
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skb_size += ETH_HLEN + NET_IP_ALIGN;
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forw_packet_aggr->skb = dev_alloc_skb(skb_size);
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if (!forw_packet_aggr->skb) {
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if (!own_packet)
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atomic_inc(&bat_priv->batman_queue_left);
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kfree(forw_packet_aggr);
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goto out;
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}
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skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN);
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INIT_HLIST_NODE(&forw_packet_aggr->list);
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skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
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forw_packet_aggr->packet_len = packet_len;
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memcpy(skb_buff, packet_buff, packet_len);
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forw_packet_aggr->own = own_packet;
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forw_packet_aggr->if_incoming = if_incoming;
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forw_packet_aggr->num_packets = 0;
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forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
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forw_packet_aggr->send_time = send_time;
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|
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/* save packet direct link flag status */
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if (direct_link)
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forw_packet_aggr->direct_link_flags |= 1;
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|
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/* add new packet to packet list */
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spin_lock_bh(&bat_priv->forw_bat_list_lock);
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hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
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spin_unlock_bh(&bat_priv->forw_bat_list_lock);
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|
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/* start timer for this packet */
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INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
|
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batadv_send_outstanding_bat_ogm_packet);
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queue_delayed_work(batadv_event_workqueue,
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&forw_packet_aggr->delayed_work,
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send_time - jiffies);
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|
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return;
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|
out:
|
|
batadv_hardif_free_ref(if_incoming);
|
|
}
|
|
|
|
/* aggregate a new packet into the existing ogm packet */
|
|
static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
|
|
const unsigned char *packet_buff,
|
|
int packet_len, bool direct_link)
|
|
{
|
|
unsigned char *skb_buff;
|
|
unsigned long new_direct_link_flag;
|
|
|
|
skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
|
|
memcpy(skb_buff, packet_buff, packet_len);
|
|
forw_packet_aggr->packet_len += packet_len;
|
|
forw_packet_aggr->num_packets++;
|
|
|
|
/* save packet direct link flag status */
|
|
if (direct_link) {
|
|
new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
|
|
forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
|
|
}
|
|
}
|
|
|
|
static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
|
|
unsigned char *packet_buff,
|
|
int packet_len,
|
|
struct batadv_hard_iface *if_incoming,
|
|
int own_packet, unsigned long send_time)
|
|
{
|
|
/* _aggr -> pointer to the packet we want to aggregate with
|
|
* _pos -> pointer to the position in the queue
|
|
*/
|
|
struct batadv_forw_packet *forw_packet_aggr = NULL;
|
|
struct batadv_forw_packet *forw_packet_pos = NULL;
|
|
struct hlist_node *tmp_node;
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
bool direct_link;
|
|
unsigned long max_aggregation_jiffies;
|
|
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
|
|
direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
|
|
max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
|
|
|
|
/* find position for the packet in the forward queue */
|
|
spin_lock_bh(&bat_priv->forw_bat_list_lock);
|
|
/* own packets are not to be aggregated */
|
|
if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
|
|
hlist_for_each_entry(forw_packet_pos, tmp_node,
|
|
&bat_priv->forw_bat_list, list) {
|
|
if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
|
|
bat_priv, packet_len,
|
|
send_time, direct_link,
|
|
if_incoming,
|
|
forw_packet_pos)) {
|
|
forw_packet_aggr = forw_packet_pos;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* nothing to aggregate with - either aggregation disabled or no
|
|
* suitable aggregation packet found
|
|
*/
|
|
if (!forw_packet_aggr) {
|
|
/* the following section can run without the lock */
|
|
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
|
|
|
|
/* if we could not aggregate this packet with one of the others
|
|
* we hold it back for a while, so that it might be aggregated
|
|
* later on
|
|
*/
|
|
if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
|
|
send_time += max_aggregation_jiffies;
|
|
|
|
batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
|
|
send_time, direct_link,
|
|
if_incoming, own_packet);
|
|
} else {
|
|
batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
|
|
packet_len, direct_link);
|
|
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
|
|
}
|
|
}
|
|
|
|
static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
|
|
const struct ethhdr *ethhdr,
|
|
struct batadv_ogm_packet *batadv_ogm_packet,
|
|
bool is_single_hop_neigh,
|
|
bool is_from_best_next_hop,
|
|
struct batadv_hard_iface *if_incoming)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
uint8_t tt_num_changes;
|
|
|
|
if (batadv_ogm_packet->header.ttl <= 1) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
|
|
return;
|
|
}
|
|
|
|
if (!is_from_best_next_hop) {
|
|
/* Mark the forwarded packet when it is not coming from our
|
|
* best next hop. We still need to forward the packet for our
|
|
* neighbor link quality detection to work in case the packet
|
|
* originated from a single hop neighbor. Otherwise we can
|
|
* simply drop the ogm.
|
|
*/
|
|
if (is_single_hop_neigh)
|
|
batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
|
|
else
|
|
return;
|
|
}
|
|
|
|
tt_num_changes = batadv_ogm_packet->tt_num_changes;
|
|
|
|
batadv_ogm_packet->header.ttl--;
|
|
memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
|
|
|
|
/* apply hop penalty */
|
|
batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
|
|
bat_priv);
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Forwarding packet: tq: %i, ttl: %i\n",
|
|
batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
|
|
|
|
/* switch of primaries first hop flag when forwarding */
|
|
batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
|
|
if (is_single_hop_neigh)
|
|
batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
|
|
else
|
|
batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
|
|
|
|
batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
|
|
BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
|
|
if_incoming, 0, batadv_iv_ogm_fwd_send_time());
|
|
}
|
|
|
|
static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
struct batadv_hard_iface *primary_if;
|
|
int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
|
|
int vis_server, tt_num_changes = 0;
|
|
uint32_t seqno;
|
|
uint8_t bandwidth;
|
|
|
|
vis_server = atomic_read(&bat_priv->vis_mode);
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
|
|
if (hard_iface == primary_if)
|
|
tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff,
|
|
ogm_buff_len,
|
|
BATADV_OGM_HLEN);
|
|
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
|
|
|
|
/* change sequence number to network order */
|
|
seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
|
|
batadv_ogm_packet->seqno = htonl(seqno);
|
|
atomic_inc(&hard_iface->bat_iv.ogm_seqno);
|
|
|
|
batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
|
|
batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
|
|
if (tt_num_changes >= 0)
|
|
batadv_ogm_packet->tt_num_changes = tt_num_changes;
|
|
|
|
if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
|
|
batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
|
|
else
|
|
batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
|
|
|
|
if (hard_iface == primary_if &&
|
|
atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
|
|
bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
|
|
batadv_ogm_packet->gw_flags = bandwidth;
|
|
} else {
|
|
batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
|
|
}
|
|
|
|
batadv_slide_own_bcast_window(hard_iface);
|
|
batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff,
|
|
hard_iface->bat_iv.ogm_buff_len, hard_iface, 1,
|
|
batadv_iv_ogm_emit_send_time(bat_priv));
|
|
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
static void
|
|
batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
const struct ethhdr *ethhdr,
|
|
const struct batadv_ogm_packet *batadv_ogm_packet,
|
|
struct batadv_hard_iface *if_incoming,
|
|
const unsigned char *tt_buff,
|
|
int is_duplicate)
|
|
{
|
|
struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
|
|
struct batadv_neigh_node *router = NULL;
|
|
struct batadv_orig_node *orig_node_tmp;
|
|
struct hlist_node *node;
|
|
int if_num;
|
|
uint8_t sum_orig, sum_neigh;
|
|
uint8_t *neigh_addr;
|
|
uint8_t tq_avg;
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"update_originator(): Searching and updating originator entry of received packet\n");
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tmp_neigh_node, node,
|
|
&orig_node->neigh_list, list) {
|
|
neigh_addr = tmp_neigh_node->addr;
|
|
if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
|
|
tmp_neigh_node->if_incoming == if_incoming &&
|
|
atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
|
|
if (neigh_node)
|
|
batadv_neigh_node_free_ref(neigh_node);
|
|
neigh_node = tmp_neigh_node;
|
|
continue;
|
|
}
|
|
|
|
if (is_duplicate)
|
|
continue;
|
|
|
|
spin_lock_bh(&tmp_neigh_node->lq_update_lock);
|
|
batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
|
|
&tmp_neigh_node->tq_index, 0);
|
|
tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
|
|
tmp_neigh_node->tq_avg = tq_avg;
|
|
spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
|
|
}
|
|
|
|
if (!neigh_node) {
|
|
struct batadv_orig_node *orig_tmp;
|
|
|
|
orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
|
|
if (!orig_tmp)
|
|
goto unlock;
|
|
|
|
neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
|
|
ethhdr->h_source,
|
|
orig_node, orig_tmp,
|
|
batadv_ogm_packet->seqno);
|
|
|
|
batadv_orig_node_free_ref(orig_tmp);
|
|
if (!neigh_node)
|
|
goto unlock;
|
|
} else
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Updating existing last-hop neighbor of originator\n");
|
|
|
|
rcu_read_unlock();
|
|
|
|
orig_node->flags = batadv_ogm_packet->flags;
|
|
neigh_node->last_seen = jiffies;
|
|
|
|
spin_lock_bh(&neigh_node->lq_update_lock);
|
|
batadv_ring_buffer_set(neigh_node->tq_recv,
|
|
&neigh_node->tq_index,
|
|
batadv_ogm_packet->tq);
|
|
neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
|
|
spin_unlock_bh(&neigh_node->lq_update_lock);
|
|
|
|
if (!is_duplicate) {
|
|
orig_node->last_ttl = batadv_ogm_packet->header.ttl;
|
|
neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
|
|
}
|
|
|
|
batadv_bonding_candidate_add(orig_node, neigh_node);
|
|
|
|
/* if this neighbor already is our next hop there is nothing
|
|
* to change
|
|
*/
|
|
router = batadv_orig_node_get_router(orig_node);
|
|
if (router == neigh_node)
|
|
goto update_tt;
|
|
|
|
/* if this neighbor does not offer a better TQ we won't consider it */
|
|
if (router && (router->tq_avg > neigh_node->tq_avg))
|
|
goto update_tt;
|
|
|
|
/* if the TQ is the same and the link not more symmetric we
|
|
* won't consider it either
|
|
*/
|
|
if (router && (neigh_node->tq_avg == router->tq_avg)) {
|
|
orig_node_tmp = router->orig_node;
|
|
spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
|
|
if_num = router->if_incoming->if_num;
|
|
sum_orig = orig_node_tmp->bcast_own_sum[if_num];
|
|
spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
|
|
|
|
orig_node_tmp = neigh_node->orig_node;
|
|
spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
|
|
if_num = neigh_node->if_incoming->if_num;
|
|
sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
|
|
spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
|
|
|
|
if (sum_orig >= sum_neigh)
|
|
goto update_tt;
|
|
}
|
|
|
|
batadv_update_route(bat_priv, orig_node, neigh_node);
|
|
|
|
update_tt:
|
|
/* I have to check for transtable changes only if the OGM has been
|
|
* sent through a primary interface
|
|
*/
|
|
if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
|
|
(batadv_ogm_packet->header.ttl > 2)) ||
|
|
(batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
|
|
batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
|
|
batadv_ogm_packet->tt_num_changes,
|
|
batadv_ogm_packet->ttvn,
|
|
ntohs(batadv_ogm_packet->tt_crc));
|
|
|
|
if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
|
|
batadv_gw_node_update(bat_priv, orig_node,
|
|
batadv_ogm_packet->gw_flags);
|
|
|
|
orig_node->gw_flags = batadv_ogm_packet->gw_flags;
|
|
|
|
/* restart gateway selection if fast or late switching was enabled */
|
|
if ((orig_node->gw_flags) &&
|
|
(atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
|
|
(atomic_read(&bat_priv->gw_sel_class) > 2))
|
|
batadv_gw_check_election(bat_priv, orig_node);
|
|
|
|
goto out;
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
out:
|
|
if (neigh_node)
|
|
batadv_neigh_node_free_ref(neigh_node);
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
}
|
|
|
|
static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
|
|
struct batadv_orig_node *orig_neigh_node,
|
|
struct batadv_ogm_packet *batadv_ogm_packet,
|
|
struct batadv_hard_iface *if_incoming)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
|
|
struct hlist_node *node;
|
|
uint8_t total_count;
|
|
uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
|
|
unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
|
|
int tq_asym_penalty, inv_asym_penalty, ret = 0;
|
|
unsigned int combined_tq;
|
|
|
|
/* find corresponding one hop neighbor */
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tmp_neigh_node, node,
|
|
&orig_neigh_node->neigh_list, list) {
|
|
if (!batadv_compare_eth(tmp_neigh_node->addr,
|
|
orig_neigh_node->orig))
|
|
continue;
|
|
|
|
if (tmp_neigh_node->if_incoming != if_incoming)
|
|
continue;
|
|
|
|
if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
|
|
continue;
|
|
|
|
neigh_node = tmp_neigh_node;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (!neigh_node)
|
|
neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
|
|
orig_neigh_node->orig,
|
|
orig_neigh_node,
|
|
orig_neigh_node,
|
|
batadv_ogm_packet->seqno);
|
|
|
|
if (!neigh_node)
|
|
goto out;
|
|
|
|
/* if orig_node is direct neighbor update neigh_node last_seen */
|
|
if (orig_node == orig_neigh_node)
|
|
neigh_node->last_seen = jiffies;
|
|
|
|
orig_node->last_seen = jiffies;
|
|
|
|
/* find packet count of corresponding one hop neighbor */
|
|
spin_lock_bh(&orig_node->ogm_cnt_lock);
|
|
orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
|
|
neigh_rq_count = neigh_node->real_packet_count;
|
|
spin_unlock_bh(&orig_node->ogm_cnt_lock);
|
|
|
|
/* pay attention to not get a value bigger than 100 % */
|
|
if (orig_eq_count > neigh_rq_count)
|
|
total_count = neigh_rq_count;
|
|
else
|
|
total_count = orig_eq_count;
|
|
|
|
/* if we have too few packets (too less data) we set tq_own to zero
|
|
* if we receive too few packets it is not considered bidirectional
|
|
*/
|
|
if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
|
|
neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
|
|
tq_own = 0;
|
|
else
|
|
/* neigh_node->real_packet_count is never zero as we
|
|
* only purge old information when getting new
|
|
* information
|
|
*/
|
|
tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
|
|
|
|
/* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
|
|
* affect the nearly-symmetric links only a little, but
|
|
* punishes asymmetric links more. This will give a value
|
|
* between 0 and TQ_MAX_VALUE
|
|
*/
|
|
neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
|
|
neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
|
|
neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
|
|
BATADV_TQ_LOCAL_WINDOW_SIZE *
|
|
BATADV_TQ_LOCAL_WINDOW_SIZE;
|
|
inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
|
|
inv_asym_penalty /= neigh_rq_max_cube;
|
|
tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
|
|
|
|
combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
|
|
combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
|
|
batadv_ogm_packet->tq = combined_tq;
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
|
|
orig_node->orig, orig_neigh_node->orig, total_count,
|
|
neigh_rq_count, tq_own,
|
|
tq_asym_penalty, batadv_ogm_packet->tq);
|
|
|
|
/* if link has the minimum required transmission quality
|
|
* consider it bidirectional
|
|
*/
|
|
if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
|
|
ret = 1;
|
|
|
|
out:
|
|
if (neigh_node)
|
|
batadv_neigh_node_free_ref(neigh_node);
|
|
return ret;
|
|
}
|
|
|
|
/* processes a batman packet for all interfaces, adjusts the sequence number and
|
|
* finds out whether it is a duplicate.
|
|
* returns:
|
|
* 1 the packet is a duplicate
|
|
* 0 the packet has not yet been received
|
|
* -1 the packet is old and has been received while the seqno window
|
|
* was protected. Caller should drop it.
|
|
*/
|
|
static int
|
|
batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
|
|
const struct batadv_ogm_packet *batadv_ogm_packet,
|
|
const struct batadv_hard_iface *if_incoming)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_orig_node *orig_node;
|
|
struct batadv_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;
|
|
uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
|
|
uint8_t *neigh_addr;
|
|
uint8_t packet_count;
|
|
|
|
orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
|
|
if (!orig_node)
|
|
return 0;
|
|
|
|
spin_lock_bh(&orig_node->ogm_cnt_lock);
|
|
seq_diff = seqno - orig_node->last_real_seqno;
|
|
|
|
/* signalize caller that the packet is to be dropped. */
|
|
if (!hlist_empty(&orig_node->neigh_list) &&
|
|
batadv_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 |= batadv_test_bit(tmp_neigh_node->real_bits,
|
|
orig_node->last_real_seqno,
|
|
seqno);
|
|
|
|
neigh_addr = tmp_neigh_node->addr;
|
|
if (batadv_compare_eth(neigh_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 |= batadv_bit_get_packet(bat_priv,
|
|
tmp_neigh_node->real_bits,
|
|
seq_diff, set_mark);
|
|
|
|
packet_count = bitmap_weight(tmp_neigh_node->real_bits,
|
|
BATADV_TQ_LOCAL_WINDOW_SIZE);
|
|
tmp_neigh_node->real_packet_count = packet_count;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (need_update) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"updating last_seqno: old %u, new %u\n",
|
|
orig_node->last_real_seqno, seqno);
|
|
orig_node->last_real_seqno = seqno;
|
|
}
|
|
|
|
ret = is_duplicate;
|
|
|
|
out:
|
|
spin_unlock_bh(&orig_node->ogm_cnt_lock);
|
|
batadv_orig_node_free_ref(orig_node);
|
|
return ret;
|
|
}
|
|
|
|
static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
|
|
struct batadv_ogm_packet *batadv_ogm_packet,
|
|
const unsigned char *tt_buff,
|
|
struct batadv_hard_iface *if_incoming)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_hard_iface *hard_iface;
|
|
struct batadv_orig_node *orig_neigh_node, *orig_node;
|
|
struct batadv_neigh_node *router = NULL, *router_router = NULL;
|
|
struct batadv_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_bidirect;
|
|
bool is_single_hop_neigh = false;
|
|
bool is_from_best_next_hop = false;
|
|
int is_duplicate, sameseq, simlar_ttl;
|
|
uint32_t if_incoming_seqno;
|
|
uint8_t *prev_sender;
|
|
|
|
/* 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
|
|
* batadv_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 (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
|
|
return;
|
|
|
|
/* could be changed by schedule_own_packet() */
|
|
if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
|
|
|
|
if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
|
|
has_directlink_flag = 1;
|
|
else
|
|
has_directlink_flag = 0;
|
|
|
|
if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
|
|
is_single_hop_neigh = true;
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %#.4x, 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, batadv_ogm_packet->orig,
|
|
batadv_ogm_packet->prev_sender,
|
|
ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
|
|
ntohs(batadv_ogm_packet->tt_crc),
|
|
batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
|
|
batadv_ogm_packet->header.ttl,
|
|
batadv_ogm_packet->header.version, has_directlink_flag);
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if (hard_iface->if_status != BATADV_IF_ACTIVE)
|
|
continue;
|
|
|
|
if (hard_iface->soft_iface != if_incoming->soft_iface)
|
|
continue;
|
|
|
|
if (batadv_compare_eth(ethhdr->h_source,
|
|
hard_iface->net_dev->dev_addr))
|
|
is_my_addr = 1;
|
|
|
|
if (batadv_compare_eth(batadv_ogm_packet->orig,
|
|
hard_iface->net_dev->dev_addr))
|
|
is_my_orig = 1;
|
|
|
|
if (batadv_compare_eth(batadv_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 (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: incompatible batman version (%i)\n",
|
|
batadv_ogm_packet->header.version);
|
|
return;
|
|
}
|
|
|
|
if (is_my_addr) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: received my own broadcast (sender: %pM)\n",
|
|
ethhdr->h_source);
|
|
return;
|
|
}
|
|
|
|
if (is_broadcast) {
|
|
batadv_dbg(BATADV_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;
|
|
int32_t bit_pos;
|
|
int16_t if_num;
|
|
uint8_t *weight;
|
|
|
|
orig_neigh_node = batadv_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 &&
|
|
batadv_compare_eth(if_incoming->net_dev->dev_addr,
|
|
batadv_ogm_packet->orig)) {
|
|
if_num = if_incoming->if_num;
|
|
offset = if_num * BATADV_NUM_WORDS;
|
|
|
|
spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
|
|
word = &(orig_neigh_node->bcast_own[offset]);
|
|
bit_pos = if_incoming_seqno - 2;
|
|
bit_pos -= ntohl(batadv_ogm_packet->seqno);
|
|
batadv_set_bit(word, bit_pos);
|
|
weight = &orig_neigh_node->bcast_own_sum[if_num];
|
|
*weight = bitmap_weight(word,
|
|
BATADV_TQ_LOCAL_WINDOW_SIZE);
|
|
spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
|
|
}
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: originator packet from myself (via neighbor)\n");
|
|
batadv_orig_node_free_ref(orig_neigh_node);
|
|
return;
|
|
}
|
|
|
|
if (is_my_oldorig) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
|
|
ethhdr->h_source);
|
|
return;
|
|
}
|
|
|
|
if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
|
|
ethhdr->h_source);
|
|
return;
|
|
}
|
|
|
|
orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
|
|
if (!orig_node)
|
|
return;
|
|
|
|
is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
|
|
if_incoming);
|
|
|
|
if (is_duplicate == -1) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: packet within seqno protection time (sender: %pM)\n",
|
|
ethhdr->h_source);
|
|
goto out;
|
|
}
|
|
|
|
if (batadv_ogm_packet->tq == 0) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: originator packet with tq equal 0\n");
|
|
goto out;
|
|
}
|
|
|
|
router = batadv_orig_node_get_router(orig_node);
|
|
if (router)
|
|
router_router = batadv_orig_node_get_router(router->orig_node);
|
|
|
|
if ((router && router->tq_avg != 0) &&
|
|
(batadv_compare_eth(router->addr, ethhdr->h_source)))
|
|
is_from_best_next_hop = true;
|
|
|
|
prev_sender = batadv_ogm_packet->prev_sender;
|
|
/* avoid temporary routing loops */
|
|
if (router && router_router &&
|
|
(batadv_compare_eth(router->addr, prev_sender)) &&
|
|
!(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
|
|
(batadv_compare_eth(router->addr, router_router->addr))) {
|
|
batadv_dbg(BATADV_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
|
|
*/
|
|
if (is_single_hop_neigh)
|
|
orig_neigh_node = orig_node;
|
|
else
|
|
orig_neigh_node = batadv_get_orig_node(bat_priv,
|
|
ethhdr->h_source);
|
|
|
|
if (!orig_neigh_node)
|
|
goto out;
|
|
|
|
orig_neigh_router = batadv_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)) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: OGM via unknown neighbor!\n");
|
|
goto out_neigh;
|
|
}
|
|
|
|
is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
|
|
batadv_ogm_packet, if_incoming);
|
|
|
|
batadv_bonding_save_primary(orig_node, orig_neigh_node,
|
|
batadv_ogm_packet);
|
|
|
|
/* update ranking if it is not a duplicate or has the same
|
|
* seqno and similar ttl as the non-duplicate
|
|
*/
|
|
sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
|
|
simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
|
|
if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
|
|
batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
|
|
batadv_ogm_packet, if_incoming,
|
|
tt_buff, is_duplicate);
|
|
|
|
/* is single hop (direct) neighbor */
|
|
if (is_single_hop_neigh) {
|
|
/* mark direct link on incoming interface */
|
|
batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
|
|
is_single_hop_neigh,
|
|
is_from_best_next_hop, if_incoming);
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
|
|
goto out_neigh;
|
|
}
|
|
|
|
/* multihop originator */
|
|
if (!is_bidirect) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: not received via bidirectional link\n");
|
|
goto out_neigh;
|
|
}
|
|
|
|
if (is_duplicate) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: duplicate packet received\n");
|
|
goto out_neigh;
|
|
}
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Forwarding packet: rebroadcast originator packet\n");
|
|
batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
|
|
is_single_hop_neigh, is_from_best_next_hop,
|
|
if_incoming);
|
|
|
|
out_neigh:
|
|
if ((orig_neigh_node) && (!is_single_hop_neigh))
|
|
batadv_orig_node_free_ref(orig_neigh_node);
|
|
out:
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
if (router_router)
|
|
batadv_neigh_node_free_ref(router_router);
|
|
if (orig_neigh_router)
|
|
batadv_neigh_node_free_ref(orig_neigh_router);
|
|
|
|
batadv_orig_node_free_ref(orig_node);
|
|
}
|
|
|
|
static int batadv_iv_ogm_receive(struct sk_buff *skb,
|
|
struct batadv_hard_iface *if_incoming)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
struct ethhdr *ethhdr;
|
|
int buff_pos = 0, packet_len;
|
|
unsigned char *tt_buff, *packet_buff;
|
|
bool ret;
|
|
uint8_t *packet_pos;
|
|
|
|
ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
|
|
if (!ret)
|
|
return NET_RX_DROP;
|
|
|
|
/* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
|
|
* that does not have B.A.T.M.A.N. IV enabled ?
|
|
*/
|
|
if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
|
|
return NET_RX_DROP;
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
|
|
batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
|
|
skb->len + ETH_HLEN);
|
|
|
|
packet_len = skb_headlen(skb);
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
packet_buff = skb->data;
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
|
|
|
|
/* unpack the aggregated packets and process them one by one */
|
|
do {
|
|
tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
|
|
|
|
batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
|
|
if_incoming);
|
|
|
|
buff_pos += BATADV_OGM_HLEN;
|
|
buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
|
|
|
|
packet_pos = packet_buff + buff_pos;
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
|
|
} while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
|
|
batadv_ogm_packet->tt_num_changes));
|
|
|
|
kfree_skb(skb);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
|
|
.name = "BATMAN_IV",
|
|
.bat_iface_enable = batadv_iv_ogm_iface_enable,
|
|
.bat_iface_disable = batadv_iv_ogm_iface_disable,
|
|
.bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
|
|
.bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
|
|
.bat_ogm_schedule = batadv_iv_ogm_schedule,
|
|
.bat_ogm_emit = batadv_iv_ogm_emit,
|
|
};
|
|
|
|
int __init batadv_iv_init(void)
|
|
{
|
|
int ret;
|
|
|
|
/* batman originator packet */
|
|
ret = batadv_recv_handler_register(BATADV_IV_OGM,
|
|
batadv_iv_ogm_receive);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = batadv_algo_register(&batadv_batman_iv);
|
|
if (ret < 0)
|
|
goto handler_unregister;
|
|
|
|
goto out;
|
|
|
|
handler_unregister:
|
|
batadv_recv_handler_unregister(BATADV_IV_OGM);
|
|
out:
|
|
return ret;
|
|
}
|