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![Sven Eckelmann](/assets/img/avatar_default.png)
Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
898 lines
27 KiB
C
898 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2013-2018 B.A.T.M.A.N. contributors:
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*
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* Antonio Quartulli
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include "bat_v_ogm.h"
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/byteorder/generic.h>
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#include <linux/errno.h>
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#include <linux/etherdevice.h>
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#include <linux/gfp.h>
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#include <linux/if_ether.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/random.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include <uapi/linux/batadv_packet.h>
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#include "bat_algo.h"
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#include "hard-interface.h"
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#include "hash.h"
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#include "log.h"
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#include "originator.h"
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#include "routing.h"
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#include "send.h"
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#include "translation-table.h"
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#include "tvlv.h"
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/**
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* batadv_v_ogm_orig_get() - retrieve and possibly create an originator node
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* @bat_priv: the bat priv with all the soft interface information
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* @addr: the address of the originator
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*
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* Return: the orig_node corresponding to the specified address. If such object
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* does not exist it is allocated here. In case of allocation failure returns
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* NULL.
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*/
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struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv,
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const u8 *addr)
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{
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struct batadv_orig_node *orig_node;
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int hash_added;
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orig_node = batadv_orig_hash_find(bat_priv, addr);
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if (orig_node)
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return orig_node;
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orig_node = batadv_orig_node_new(bat_priv, addr);
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if (!orig_node)
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return NULL;
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kref_get(&orig_node->refcount);
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hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
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batadv_choose_orig, orig_node,
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&orig_node->hash_entry);
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if (hash_added != 0) {
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/* remove refcnt for newly created orig_node and hash entry */
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batadv_orig_node_put(orig_node);
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batadv_orig_node_put(orig_node);
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orig_node = NULL;
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}
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return orig_node;
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}
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/**
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* batadv_v_ogm_start_timer() - restart the OGM sending timer
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* @bat_priv: the bat priv with all the soft interface information
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*/
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static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv)
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{
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unsigned long msecs;
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/* this function may be invoked in different contexts (ogm rescheduling
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* or hard_iface activation), but the work timer should not be reset
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*/
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if (delayed_work_pending(&bat_priv->bat_v.ogm_wq))
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return;
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msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
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msecs += prandom_u32() % (2 * BATADV_JITTER);
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queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq,
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msecs_to_jiffies(msecs));
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}
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/**
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* batadv_v_ogm_send_to_if() - send a batman ogm using a given interface
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* @skb: the OGM to send
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* @hard_iface: the interface to use to send the OGM
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*/
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static void batadv_v_ogm_send_to_if(struct sk_buff *skb,
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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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if (hard_iface->if_status != BATADV_IF_ACTIVE)
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return;
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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_broadcast_skb(skb, hard_iface);
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}
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/**
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* batadv_v_ogm_send() - periodic worker broadcasting the own OGM
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* @work: work queue item
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*/
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static void batadv_v_ogm_send(struct work_struct *work)
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{
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struct batadv_hard_iface *hard_iface;
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struct batadv_priv_bat_v *bat_v;
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struct batadv_priv *bat_priv;
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struct batadv_ogm2_packet *ogm_packet;
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struct sk_buff *skb, *skb_tmp;
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unsigned char *ogm_buff;
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int ogm_buff_len;
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u16 tvlv_len = 0;
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int ret;
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bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work);
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bat_priv = container_of(bat_v, struct batadv_priv, bat_v);
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if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
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goto out;
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ogm_buff = bat_priv->bat_v.ogm_buff;
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ogm_buff_len = bat_priv->bat_v.ogm_buff_len;
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/* tt changes have to be committed before the tvlv data is
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* appended as it may alter the tt tvlv container
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*/
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batadv_tt_local_commit_changes(bat_priv);
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tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff,
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&ogm_buff_len,
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BATADV_OGM2_HLEN);
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bat_priv->bat_v.ogm_buff = ogm_buff;
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bat_priv->bat_v.ogm_buff_len = ogm_buff_len;
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skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len);
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if (!skb)
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goto reschedule;
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skb_reserve(skb, ETH_HLEN);
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skb_put_data(skb, ogm_buff, ogm_buff_len);
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ogm_packet = (struct batadv_ogm2_packet *)skb->data;
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ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno));
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atomic_inc(&bat_priv->bat_v.ogm_seqno);
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ogm_packet->tvlv_len = htons(tvlv_len);
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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 != bat_priv->soft_iface)
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continue;
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if (!kref_get_unless_zero(&hard_iface->refcount))
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continue;
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ret = batadv_hardif_no_broadcast(hard_iface, NULL, NULL);
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if (ret) {
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char *type;
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switch (ret) {
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case BATADV_HARDIF_BCAST_NORECIPIENT:
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type = "no neighbor";
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break;
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case BATADV_HARDIF_BCAST_DUPFWD:
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type = "single neighbor is source";
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break;
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case BATADV_HARDIF_BCAST_DUPORIG:
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type = "single neighbor is originator";
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break;
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default:
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type = "unknown";
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}
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 from ourselves on %s suppressed: %s\n",
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hard_iface->net_dev->name, type);
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batadv_hardif_put(hard_iface);
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continue;
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}
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n",
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ogm_packet->orig, ntohl(ogm_packet->seqno),
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ntohl(ogm_packet->throughput), ogm_packet->ttl,
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hard_iface->net_dev->name,
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hard_iface->net_dev->dev_addr);
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/* this skb gets consumed by batadv_v_ogm_send_to_if() */
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skb_tmp = skb_clone(skb, GFP_ATOMIC);
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if (!skb_tmp) {
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batadv_hardif_put(hard_iface);
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break;
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}
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batadv_v_ogm_send_to_if(skb_tmp, hard_iface);
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batadv_hardif_put(hard_iface);
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}
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rcu_read_unlock();
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consume_skb(skb);
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reschedule:
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batadv_v_ogm_start_timer(bat_priv);
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out:
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return;
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}
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/**
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* batadv_v_ogm_iface_enable() - prepare an interface for B.A.T.M.A.N. V
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* @hard_iface: the interface to prepare
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*
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* Takes care of scheduling own OGM sending routine for this interface.
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*
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* Return: 0 on success or a negative error code otherwise
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*/
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int batadv_v_ogm_iface_enable(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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batadv_v_ogm_start_timer(bat_priv);
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return 0;
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}
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/**
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* batadv_v_ogm_primary_iface_set() - set a new primary interface
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* @primary_iface: the new primary interface
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*/
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void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface)
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{
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struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface);
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struct batadv_ogm2_packet *ogm_packet;
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if (!bat_priv->bat_v.ogm_buff)
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return;
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ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff;
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ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr);
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}
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/**
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* batadv_v_forward_penalty() - apply a penalty to the throughput metric
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* forwarded with B.A.T.M.A.N. V OGMs
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* @bat_priv: the bat priv with all the soft interface information
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* @if_incoming: the interface where the OGM has been received
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* @if_outgoing: the interface where the OGM has to be forwarded to
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* @throughput: the current throughput
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*
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* Apply a penalty on the current throughput metric value based on the
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* characteristic of the interface where the OGM has been received. The return
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* value is computed as follows:
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* - throughput * 50% if the incoming and outgoing interface are the
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* same WiFi interface and the throughput is above
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* 1MBit/s
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* - throughput if the outgoing interface is the default
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* interface (i.e. this OGM is processed for the
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* internal table and not forwarded)
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* - throughput * hop penalty otherwise
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*
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* Return: the penalised throughput metric.
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*/
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static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv,
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struct batadv_hard_iface *if_incoming,
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struct batadv_hard_iface *if_outgoing,
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u32 throughput)
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{
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int hop_penalty = atomic_read(&bat_priv->hop_penalty);
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int hop_penalty_max = BATADV_TQ_MAX_VALUE;
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/* Don't apply hop penalty in default originator table. */
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if (if_outgoing == BATADV_IF_DEFAULT)
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return throughput;
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/* Forwarding on the same WiFi interface cuts the throughput in half
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* due to the store & forward characteristics of WIFI.
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* Very low throughput values are the exception.
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*/
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if (throughput > 10 &&
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if_incoming == if_outgoing &&
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!(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX))
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return throughput / 2;
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/* hop penalty of 255 equals 100% */
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return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max;
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}
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/**
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* batadv_v_ogm_forward() - check conditions and forward an OGM to the given
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* outgoing interface
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* @bat_priv: the bat priv with all the soft interface information
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* @ogm_received: previously received OGM to be forwarded
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* @orig_node: the originator which has been updated
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* @neigh_node: the neigh_node through with the OGM has been received
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* @if_incoming: the interface on which this OGM was received on
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* @if_outgoing: the interface to which the OGM has to be forwarded to
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*
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* Forward an OGM to an interface after having altered the throughput metric and
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* the TTL value contained in it. The original OGM isn't modified.
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*/
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static void batadv_v_ogm_forward(struct batadv_priv *bat_priv,
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const struct batadv_ogm2_packet *ogm_received,
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struct batadv_orig_node *orig_node,
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struct batadv_neigh_node *neigh_node,
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struct batadv_hard_iface *if_incoming,
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struct batadv_hard_iface *if_outgoing)
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{
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struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
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struct batadv_orig_ifinfo *orig_ifinfo = NULL;
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struct batadv_neigh_node *router = NULL;
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struct batadv_ogm2_packet *ogm_forward;
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unsigned char *skb_buff;
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struct sk_buff *skb;
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size_t packet_len;
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u16 tvlv_len;
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/* only forward for specific interfaces, not for the default one. */
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if (if_outgoing == BATADV_IF_DEFAULT)
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goto out;
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orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
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if (!orig_ifinfo)
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goto out;
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/* acquire possibly updated router */
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router = batadv_orig_router_get(orig_node, if_outgoing);
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/* strict rule: forward packets coming from the best next hop only */
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if (neigh_node != router)
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goto out;
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/* don't forward the same seqno twice on one interface */
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if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm_received->seqno))
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goto out;
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orig_ifinfo->last_seqno_forwarded = ntohl(ogm_received->seqno);
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if (ogm_received->ttl <= 1) {
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
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goto out;
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}
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neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
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if (!neigh_ifinfo)
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goto out;
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tvlv_len = ntohs(ogm_received->tvlv_len);
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packet_len = BATADV_OGM2_HLEN + tvlv_len;
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skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev,
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ETH_HLEN + packet_len);
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if (!skb)
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goto out;
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skb_reserve(skb, ETH_HLEN);
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skb_buff = skb_put_data(skb, ogm_received, packet_len);
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/* apply forward penalty */
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ogm_forward = (struct batadv_ogm2_packet *)skb_buff;
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ogm_forward->throughput = htonl(neigh_ifinfo->bat_v.throughput);
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ogm_forward->ttl--;
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n",
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if_outgoing->net_dev->name, ntohl(ogm_forward->throughput),
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ogm_forward->ttl, if_incoming->net_dev->name);
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batadv_v_ogm_send_to_if(skb, if_outgoing);
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out:
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if (orig_ifinfo)
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batadv_orig_ifinfo_put(orig_ifinfo);
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if (router)
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batadv_neigh_node_put(router);
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if (neigh_ifinfo)
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batadv_neigh_ifinfo_put(neigh_ifinfo);
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}
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/**
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* batadv_v_ogm_metric_update() - update route metric based on OGM
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* @bat_priv: the bat priv with all the soft interface information
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* @ogm2: OGM2 structure
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* @orig_node: Originator structure for which the OGM has been received
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* @neigh_node: the neigh_node through with the OGM has been received
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* @if_incoming: the interface where this packet was received
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* @if_outgoing: the interface for which the packet should be considered
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*
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* Return:
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* 1 if the OGM is new,
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* 0 if it is not new but valid,
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* <0 on error (e.g. old OGM)
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*/
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static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv,
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const struct batadv_ogm2_packet *ogm2,
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struct batadv_orig_node *orig_node,
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struct batadv_neigh_node *neigh_node,
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struct batadv_hard_iface *if_incoming,
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struct batadv_hard_iface *if_outgoing)
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{
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struct batadv_orig_ifinfo *orig_ifinfo;
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struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
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bool protection_started = false;
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int ret = -EINVAL;
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u32 path_throughput;
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s32 seq_diff;
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orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
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if (!orig_ifinfo)
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goto out;
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seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno;
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if (!hlist_empty(&orig_node->neigh_list) &&
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batadv_window_protected(bat_priv, seq_diff,
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BATADV_OGM_MAX_AGE,
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&orig_ifinfo->batman_seqno_reset,
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&protection_started)) {
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Drop packet: packet within window protection time from %pM\n",
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ogm2->orig);
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Last reset: %ld, %ld\n",
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orig_ifinfo->batman_seqno_reset, jiffies);
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goto out;
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}
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|
|
/* drop packets with old seqnos, however accept the first packet after
|
|
* a host has been rebooted.
|
|
*/
|
|
if (seq_diff < 0 && !protection_started)
|
|
goto out;
|
|
|
|
neigh_node->last_seen = jiffies;
|
|
|
|
orig_node->last_seen = jiffies;
|
|
|
|
orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno);
|
|
orig_ifinfo->last_ttl = ogm2->ttl;
|
|
|
|
neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
|
|
if (!neigh_ifinfo)
|
|
goto out;
|
|
|
|
path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming,
|
|
if_outgoing,
|
|
ntohl(ogm2->throughput));
|
|
neigh_ifinfo->bat_v.throughput = path_throughput;
|
|
neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno);
|
|
neigh_ifinfo->last_ttl = ogm2->ttl;
|
|
|
|
if (seq_diff > 0 || protection_started)
|
|
ret = 1;
|
|
else
|
|
ret = 0;
|
|
out:
|
|
if (orig_ifinfo)
|
|
batadv_orig_ifinfo_put(orig_ifinfo);
|
|
if (neigh_ifinfo)
|
|
batadv_neigh_ifinfo_put(neigh_ifinfo);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_v_ogm_route_update() - update routes based on OGM
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @ethhdr: the Ethernet header of the OGM2
|
|
* @ogm2: OGM2 structure
|
|
* @orig_node: Originator structure for which the OGM has been received
|
|
* @neigh_node: the neigh_node through with the OGM has been received
|
|
* @if_incoming: the interface where this packet was received
|
|
* @if_outgoing: the interface for which the packet should be considered
|
|
*
|
|
* Return: true if the packet should be forwarded, false otherwise
|
|
*/
|
|
static bool batadv_v_ogm_route_update(struct batadv_priv *bat_priv,
|
|
const struct ethhdr *ethhdr,
|
|
const struct batadv_ogm2_packet *ogm2,
|
|
struct batadv_orig_node *orig_node,
|
|
struct batadv_neigh_node *neigh_node,
|
|
struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing)
|
|
{
|
|
struct batadv_neigh_node *router = NULL;
|
|
struct batadv_orig_node *orig_neigh_node;
|
|
struct batadv_neigh_node *orig_neigh_router = NULL;
|
|
struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL;
|
|
u32 router_throughput, neigh_throughput;
|
|
u32 router_last_seqno;
|
|
u32 neigh_last_seqno;
|
|
s32 neigh_seq_diff;
|
|
bool forward = false;
|
|
|
|
orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source);
|
|
if (!orig_neigh_node)
|
|
goto out;
|
|
|
|
orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
|
|
if_outgoing);
|
|
|
|
/* drop packet if sender is not a direct neighbor and if we
|
|
* don't route towards it
|
|
*/
|
|
router = batadv_orig_router_get(orig_node, if_outgoing);
|
|
if (router && router->orig_node != orig_node && !orig_neigh_router) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: OGM via unknown neighbor!\n");
|
|
goto out;
|
|
}
|
|
|
|
/* Mark the OGM to be considered for forwarding, and update routes
|
|
* if needed.
|
|
*/
|
|
forward = true;
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Searching and updating originator entry of received packet\n");
|
|
|
|
/* if this neighbor already is our next hop there is nothing
|
|
* to change
|
|
*/
|
|
if (router == neigh_node)
|
|
goto out;
|
|
|
|
/* don't consider neighbours with worse throughput.
|
|
* also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than
|
|
* the last received seqno from our best next hop.
|
|
*/
|
|
if (router) {
|
|
router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
|
|
neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
|
|
|
|
/* if these are not allocated, something is wrong. */
|
|
if (!router_ifinfo || !neigh_ifinfo)
|
|
goto out;
|
|
|
|
neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno;
|
|
router_last_seqno = router_ifinfo->bat_v.last_seqno;
|
|
neigh_seq_diff = neigh_last_seqno - router_last_seqno;
|
|
router_throughput = router_ifinfo->bat_v.throughput;
|
|
neigh_throughput = neigh_ifinfo->bat_v.throughput;
|
|
|
|
if (neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF &&
|
|
router_throughput >= neigh_throughput)
|
|
goto out;
|
|
}
|
|
|
|
batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
|
|
out:
|
|
if (router)
|
|
batadv_neigh_node_put(router);
|
|
if (orig_neigh_router)
|
|
batadv_neigh_node_put(orig_neigh_router);
|
|
if (orig_neigh_node)
|
|
batadv_orig_node_put(orig_neigh_node);
|
|
if (router_ifinfo)
|
|
batadv_neigh_ifinfo_put(router_ifinfo);
|
|
if (neigh_ifinfo)
|
|
batadv_neigh_ifinfo_put(neigh_ifinfo);
|
|
|
|
return forward;
|
|
}
|
|
|
|
/**
|
|
* batadv_v_ogm_process_per_outif() - process a batman v OGM for an outgoing if
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @ethhdr: the Ethernet header of the OGM2
|
|
* @ogm2: OGM2 structure
|
|
* @orig_node: Originator structure for which the OGM has been received
|
|
* @neigh_node: the neigh_node through with the OGM has been received
|
|
* @if_incoming: the interface where this packet was received
|
|
* @if_outgoing: the interface for which the packet should be considered
|
|
*/
|
|
static void
|
|
batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv,
|
|
const struct ethhdr *ethhdr,
|
|
const struct batadv_ogm2_packet *ogm2,
|
|
struct batadv_orig_node *orig_node,
|
|
struct batadv_neigh_node *neigh_node,
|
|
struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing)
|
|
{
|
|
int seqno_age;
|
|
bool forward;
|
|
|
|
/* first, update the metric with according sanity checks */
|
|
seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node,
|
|
neigh_node, if_incoming,
|
|
if_outgoing);
|
|
|
|
/* outdated sequence numbers are to be discarded */
|
|
if (seqno_age < 0)
|
|
return;
|
|
|
|
/* only unknown & newer OGMs contain TVLVs we are interested in */
|
|
if (seqno_age > 0 && if_outgoing == BATADV_IF_DEFAULT)
|
|
batadv_tvlv_containers_process(bat_priv, true, orig_node,
|
|
NULL, NULL,
|
|
(unsigned char *)(ogm2 + 1),
|
|
ntohs(ogm2->tvlv_len));
|
|
|
|
/* if the metric update went through, update routes if needed */
|
|
forward = batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node,
|
|
neigh_node, if_incoming,
|
|
if_outgoing);
|
|
|
|
/* if the routes have been processed correctly, check and forward */
|
|
if (forward)
|
|
batadv_v_ogm_forward(bat_priv, ogm2, orig_node, neigh_node,
|
|
if_incoming, if_outgoing);
|
|
}
|
|
|
|
/**
|
|
* batadv_v_ogm_aggr_packet() - checks if there is another OGM aggregated
|
|
* @buff_pos: current position in the skb
|
|
* @packet_len: total length of the skb
|
|
* @tvlv_len: tvlv length of the previously considered OGM
|
|
*
|
|
* Return: true if there is enough space for another OGM, false otherwise.
|
|
*/
|
|
static bool batadv_v_ogm_aggr_packet(int buff_pos, int packet_len,
|
|
__be16 tvlv_len)
|
|
{
|
|
int next_buff_pos = 0;
|
|
|
|
next_buff_pos += buff_pos + BATADV_OGM2_HLEN;
|
|
next_buff_pos += ntohs(tvlv_len);
|
|
|
|
return (next_buff_pos <= packet_len) &&
|
|
(next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
|
|
}
|
|
|
|
/**
|
|
* batadv_v_ogm_process() - process an incoming batman v OGM
|
|
* @skb: the skb containing the OGM
|
|
* @ogm_offset: offset to the OGM which should be processed (for aggregates)
|
|
* @if_incoming: the interface where this packet was receved
|
|
*/
|
|
static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset,
|
|
struct batadv_hard_iface *if_incoming)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct ethhdr *ethhdr;
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
struct batadv_hardif_neigh_node *hardif_neigh = NULL;
|
|
struct batadv_neigh_node *neigh_node = NULL;
|
|
struct batadv_hard_iface *hard_iface;
|
|
struct batadv_ogm2_packet *ogm_packet;
|
|
u32 ogm_throughput, link_throughput, path_throughput;
|
|
int ret;
|
|
|
|
ethhdr = eth_hdr(skb);
|
|
ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset);
|
|
|
|
ogm_throughput = ntohl(ogm_packet->throughput);
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Received OGM2 packet via NB: %pM, IF: %s [%pM] (from OG: %pM, seqno %u, throughput %u, TTL %u, V %u, tvlv_len %u)\n",
|
|
ethhdr->h_source, if_incoming->net_dev->name,
|
|
if_incoming->net_dev->dev_addr, ogm_packet->orig,
|
|
ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl,
|
|
ogm_packet->version, ntohs(ogm_packet->tvlv_len));
|
|
|
|
/* If the throughput metric is 0, immediately drop the packet. No need
|
|
* to create orig_node / neigh_node for an unusable route.
|
|
*/
|
|
if (ogm_throughput == 0) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: originator packet with throughput metric of 0\n");
|
|
return;
|
|
}
|
|
|
|
/* require ELP packets be to received from this neighbor first */
|
|
hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source);
|
|
if (!hardif_neigh) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: OGM via unknown neighbor!\n");
|
|
goto out;
|
|
}
|
|
|
|
orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig);
|
|
if (!orig_node)
|
|
return;
|
|
|
|
neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming,
|
|
ethhdr->h_source);
|
|
if (!neigh_node)
|
|
goto out;
|
|
|
|
/* Update the received throughput metric to match the link
|
|
* characteristic:
|
|
* - If this OGM traveled one hop so far (emitted by single hop
|
|
* neighbor) the path throughput metric equals the link throughput.
|
|
* - For OGMs traversing more than hop the path throughput metric is
|
|
* the smaller of the path throughput and the link throughput.
|
|
*/
|
|
link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput);
|
|
path_throughput = min_t(u32, link_throughput, ogm_throughput);
|
|
ogm_packet->throughput = htonl(path_throughput);
|
|
|
|
batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node,
|
|
neigh_node, if_incoming,
|
|
BATADV_IF_DEFAULT);
|
|
|
|
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 != bat_priv->soft_iface)
|
|
continue;
|
|
|
|
if (!kref_get_unless_zero(&hard_iface->refcount))
|
|
continue;
|
|
|
|
ret = batadv_hardif_no_broadcast(hard_iface,
|
|
ogm_packet->orig,
|
|
hardif_neigh->orig);
|
|
|
|
if (ret) {
|
|
char *type;
|
|
|
|
switch (ret) {
|
|
case BATADV_HARDIF_BCAST_NORECIPIENT:
|
|
type = "no neighbor";
|
|
break;
|
|
case BATADV_HARDIF_BCAST_DUPFWD:
|
|
type = "single neighbor is source";
|
|
break;
|
|
case BATADV_HARDIF_BCAST_DUPORIG:
|
|
type = "single neighbor is originator";
|
|
break;
|
|
default:
|
|
type = "unknown";
|
|
}
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "OGM2 packet from %pM on %s suppressed: %s\n",
|
|
ogm_packet->orig, hard_iface->net_dev->name,
|
|
type);
|
|
|
|
batadv_hardif_put(hard_iface);
|
|
continue;
|
|
}
|
|
|
|
batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet,
|
|
orig_node, neigh_node,
|
|
if_incoming, hard_iface);
|
|
|
|
batadv_hardif_put(hard_iface);
|
|
}
|
|
rcu_read_unlock();
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_put(orig_node);
|
|
if (neigh_node)
|
|
batadv_neigh_node_put(neigh_node);
|
|
if (hardif_neigh)
|
|
batadv_hardif_neigh_put(hardif_neigh);
|
|
}
|
|
|
|
/**
|
|
* batadv_v_ogm_packet_recv() - OGM2 receiving handler
|
|
* @skb: the received OGM
|
|
* @if_incoming: the interface where this OGM has been received
|
|
*
|
|
* Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP
|
|
* (without freeing the skb) on failure
|
|
*/
|
|
int batadv_v_ogm_packet_recv(struct sk_buff *skb,
|
|
struct batadv_hard_iface *if_incoming)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_ogm2_packet *ogm_packet;
|
|
struct ethhdr *ethhdr = eth_hdr(skb);
|
|
int ogm_offset;
|
|
u8 *packet_pos;
|
|
int ret = NET_RX_DROP;
|
|
|
|
/* did we receive a OGM2 packet on an interface that does not have
|
|
* B.A.T.M.A.N. V enabled ?
|
|
*/
|
|
if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0)
|
|
goto free_skb;
|
|
|
|
if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN))
|
|
goto free_skb;
|
|
|
|
if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
|
|
goto free_skb;
|
|
|
|
ogm_packet = (struct batadv_ogm2_packet *)skb->data;
|
|
|
|
if (batadv_is_my_mac(bat_priv, ogm_packet->orig))
|
|
goto free_skb;
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
|
|
batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
|
|
skb->len + ETH_HLEN);
|
|
|
|
ogm_offset = 0;
|
|
ogm_packet = (struct batadv_ogm2_packet *)skb->data;
|
|
|
|
while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
|
|
ogm_packet->tvlv_len)) {
|
|
batadv_v_ogm_process(skb, ogm_offset, if_incoming);
|
|
|
|
ogm_offset += BATADV_OGM2_HLEN;
|
|
ogm_offset += ntohs(ogm_packet->tvlv_len);
|
|
|
|
packet_pos = skb->data + ogm_offset;
|
|
ogm_packet = (struct batadv_ogm2_packet *)packet_pos;
|
|
}
|
|
|
|
ret = NET_RX_SUCCESS;
|
|
|
|
free_skb:
|
|
if (ret == NET_RX_SUCCESS)
|
|
consume_skb(skb);
|
|
else
|
|
kfree_skb(skb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_v_ogm_init() - initialise the OGM2 engine
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*
|
|
* Return: 0 on success or a negative error code in case of failure
|
|
*/
|
|
int batadv_v_ogm_init(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_ogm2_packet *ogm_packet;
|
|
unsigned char *ogm_buff;
|
|
u32 random_seqno;
|
|
|
|
bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN;
|
|
ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC);
|
|
if (!ogm_buff)
|
|
return -ENOMEM;
|
|
|
|
bat_priv->bat_v.ogm_buff = ogm_buff;
|
|
ogm_packet = (struct batadv_ogm2_packet *)ogm_buff;
|
|
ogm_packet->packet_type = BATADV_OGM2;
|
|
ogm_packet->version = BATADV_COMPAT_VERSION;
|
|
ogm_packet->ttl = BATADV_TTL;
|
|
ogm_packet->flags = BATADV_NO_FLAGS;
|
|
ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE);
|
|
|
|
/* randomize initial seqno to avoid collision */
|
|
get_random_bytes(&random_seqno, sizeof(random_seqno));
|
|
atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno);
|
|
INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* batadv_v_ogm_free() - free OGM private resources
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*/
|
|
void batadv_v_ogm_free(struct batadv_priv *bat_priv)
|
|
{
|
|
cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq);
|
|
|
|
kfree(bat_priv->bat_v.ogm_buff);
|
|
bat_priv->bat_v.ogm_buff = NULL;
|
|
bat_priv->bat_v.ogm_buff_len = 0;
|
|
}
|