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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>
546 lines
17 KiB
C
546 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2011-2018 B.A.T.M.A.N. contributors:
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*
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* Linus Lüssing, Marek Lindner
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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_elp.h"
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/bitops.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/ethtool.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/netdevice.h>
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#include <linux/nl80211.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/rtnetlink.h>
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#include <linux/skbuff.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 <net/cfg80211.h>
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#include <uapi/linux/batadv_packet.h>
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#include "bat_algo.h"
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#include "bat_v_ogm.h"
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#include "hard-interface.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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/**
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* batadv_v_elp_start_timer() - restart timer for ELP periodic work
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* @hard_iface: the interface for which the timer has to be reset
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*/
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static void batadv_v_elp_start_timer(struct batadv_hard_iface *hard_iface)
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{
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unsigned int msecs;
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msecs = atomic_read(&hard_iface->bat_v.elp_interval) - BATADV_JITTER;
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msecs += prandom_u32() % (2 * BATADV_JITTER);
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queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.elp_wq,
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msecs_to_jiffies(msecs));
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}
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/**
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* batadv_v_elp_get_throughput() - get the throughput towards a neighbour
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* @neigh: the neighbour for which the throughput has to be obtained
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*
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* Return: The throughput towards the given neighbour in multiples of 100kpbs
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* (a value of '1' equals to 0.1Mbps, '10' equals 1Mbps, etc).
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*/
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static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh)
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{
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struct batadv_hard_iface *hard_iface = neigh->if_incoming;
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struct ethtool_link_ksettings link_settings;
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struct net_device *real_netdev;
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struct station_info sinfo;
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u32 throughput;
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int ret;
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/* if the user specified a customised value for this interface, then
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* return it directly
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*/
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throughput = atomic_read(&hard_iface->bat_v.throughput_override);
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if (throughput != 0)
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return throughput;
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/* if this is a wireless device, then ask its throughput through
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* cfg80211 API
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*/
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if (batadv_is_wifi_hardif(hard_iface)) {
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if (!batadv_is_cfg80211_hardif(hard_iface))
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/* unsupported WiFi driver version */
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goto default_throughput;
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real_netdev = batadv_get_real_netdev(hard_iface->net_dev);
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if (!real_netdev)
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goto default_throughput;
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ret = cfg80211_get_station(real_netdev, neigh->addr, &sinfo);
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dev_put(real_netdev);
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if (ret == -ENOENT) {
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/* Node is not associated anymore! It would be
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* possible to delete this neighbor. For now set
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* the throughput metric to 0.
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*/
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return 0;
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}
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if (ret)
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goto default_throughput;
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if (!(sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT)))
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goto default_throughput;
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return sinfo.expected_throughput / 100;
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}
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/* if not a wifi interface, check if this device provides data via
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* ethtool (e.g. an Ethernet adapter)
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*/
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memset(&link_settings, 0, sizeof(link_settings));
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rtnl_lock();
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ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings);
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rtnl_unlock();
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if (ret == 0) {
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/* link characteristics might change over time */
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if (link_settings.base.duplex == DUPLEX_FULL)
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hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX;
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else
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hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX;
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throughput = link_settings.base.speed;
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if (throughput && throughput != SPEED_UNKNOWN)
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return throughput * 10;
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}
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default_throughput:
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if (!(hard_iface->bat_v.flags & BATADV_WARNING_DEFAULT)) {
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batadv_info(hard_iface->soft_iface,
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"WiFi driver or ethtool info does not provide information about link speeds on interface %s, therefore defaulting to hardcoded throughput values of %u.%1u Mbps. Consider overriding the throughput manually or checking your driver.\n",
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hard_iface->net_dev->name,
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BATADV_THROUGHPUT_DEFAULT_VALUE / 10,
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BATADV_THROUGHPUT_DEFAULT_VALUE % 10);
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hard_iface->bat_v.flags |= BATADV_WARNING_DEFAULT;
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}
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/* if none of the above cases apply, return the base_throughput */
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return BATADV_THROUGHPUT_DEFAULT_VALUE;
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}
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/**
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* batadv_v_elp_throughput_metric_update() - worker updating the throughput
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* metric of a single hop neighbour
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* @work: the work queue item
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*/
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void batadv_v_elp_throughput_metric_update(struct work_struct *work)
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{
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struct batadv_hardif_neigh_node_bat_v *neigh_bat_v;
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struct batadv_hardif_neigh_node *neigh;
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neigh_bat_v = container_of(work, struct batadv_hardif_neigh_node_bat_v,
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metric_work);
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neigh = container_of(neigh_bat_v, struct batadv_hardif_neigh_node,
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bat_v);
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ewma_throughput_add(&neigh->bat_v.throughput,
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batadv_v_elp_get_throughput(neigh));
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/* decrement refcounter to balance increment performed before scheduling
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* this task
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*/
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batadv_hardif_neigh_put(neigh);
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}
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/**
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* batadv_v_elp_wifi_neigh_probe() - send link probing packets to a neighbour
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* @neigh: the neighbour to probe
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*
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* Sends a predefined number of unicast wifi packets to a given neighbour in
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* order to trigger the throughput estimation on this link by the RC algorithm.
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* Packets are sent only if there there is not enough payload unicast traffic
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* towards this neighbour..
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*
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* Return: True on success and false in case of error during skb preparation.
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*/
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static bool
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batadv_v_elp_wifi_neigh_probe(struct batadv_hardif_neigh_node *neigh)
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{
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struct batadv_hard_iface *hard_iface = neigh->if_incoming;
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struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
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unsigned long last_tx_diff;
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struct sk_buff *skb;
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int probe_len, i;
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int elp_skb_len;
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/* this probing routine is for Wifi neighbours only */
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if (!batadv_is_wifi_hardif(hard_iface))
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return true;
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/* probe the neighbor only if no unicast packets have been sent
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* to it in the last 100 milliseconds: this is the rate control
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* algorithm sampling interval (minstrel). In this way, if not
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* enough traffic has been sent to the neighbor, batman-adv can
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* generate 2 probe packets and push the RC algorithm to perform
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* the sampling
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*/
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last_tx_diff = jiffies_to_msecs(jiffies - neigh->bat_v.last_unicast_tx);
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if (last_tx_diff <= BATADV_ELP_PROBE_MAX_TX_DIFF)
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return true;
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probe_len = max_t(int, sizeof(struct batadv_elp_packet),
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BATADV_ELP_MIN_PROBE_SIZE);
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for (i = 0; i < BATADV_ELP_PROBES_PER_NODE; i++) {
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elp_skb_len = hard_iface->bat_v.elp_skb->len;
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skb = skb_copy_expand(hard_iface->bat_v.elp_skb, 0,
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probe_len - elp_skb_len,
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GFP_ATOMIC);
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if (!skb)
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return false;
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/* Tell the skb to get as big as the allocated space (we want
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* the packet to be exactly of that size to make the link
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* throughput estimation effective.
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*/
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skb_put(skb, probe_len - hard_iface->bat_v.elp_skb->len);
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Sending unicast (probe) ELP packet on interface %s to %pM\n",
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hard_iface->net_dev->name, neigh->addr);
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batadv_send_skb_packet(skb, hard_iface, neigh->addr);
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}
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return true;
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}
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/**
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* batadv_v_elp_periodic_work() - ELP periodic task per interface
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* @work: work queue item
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*
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* Emits broadcast ELP message in regular intervals.
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*/
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static void batadv_v_elp_periodic_work(struct work_struct *work)
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{
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struct batadv_hardif_neigh_node *hardif_neigh;
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struct batadv_hard_iface *hard_iface;
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struct batadv_hard_iface_bat_v *bat_v;
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struct batadv_elp_packet *elp_packet;
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struct batadv_priv *bat_priv;
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struct sk_buff *skb;
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u32 elp_interval;
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bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work);
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hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v);
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bat_priv = netdev_priv(hard_iface->soft_iface);
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if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
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goto out;
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/* we are in the process of shutting this interface down */
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if (hard_iface->if_status == BATADV_IF_NOT_IN_USE ||
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hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)
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goto out;
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/* the interface was enabled but may not be ready yet */
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if (hard_iface->if_status != BATADV_IF_ACTIVE)
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goto restart_timer;
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skb = skb_copy(hard_iface->bat_v.elp_skb, GFP_ATOMIC);
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if (!skb)
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goto restart_timer;
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elp_packet = (struct batadv_elp_packet *)skb->data;
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elp_packet->seqno = htonl(atomic_read(&hard_iface->bat_v.elp_seqno));
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elp_interval = atomic_read(&hard_iface->bat_v.elp_interval);
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elp_packet->elp_interval = htonl(elp_interval);
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Sending broadcast ELP packet on interface %s, seqno %u\n",
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hard_iface->net_dev->name,
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atomic_read(&hard_iface->bat_v.elp_seqno));
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batadv_send_broadcast_skb(skb, hard_iface);
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atomic_inc(&hard_iface->bat_v.elp_seqno);
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/* The throughput metric is updated on each sent packet. This way, if a
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* node is dead and no longer sends packets, batman-adv is still able to
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* react timely to its death.
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*
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* The throughput metric is updated by following these steps:
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* 1) if the hard_iface is wifi => send a number of unicast ELPs for
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* probing/sampling to each neighbor
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* 2) update the throughput metric value of each neighbor (note that the
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* value retrieved in this step might be 100ms old because the
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* probing packets at point 1) could still be in the HW queue)
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*/
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rcu_read_lock();
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hlist_for_each_entry_rcu(hardif_neigh, &hard_iface->neigh_list, list) {
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if (!batadv_v_elp_wifi_neigh_probe(hardif_neigh))
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/* if something goes wrong while probing, better to stop
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* sending packets immediately and reschedule the task
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*/
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break;
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if (!kref_get_unless_zero(&hardif_neigh->refcount))
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continue;
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/* Reading the estimated throughput from cfg80211 is a task that
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* may sleep and that is not allowed in an rcu protected
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* context. Therefore schedule a task for that.
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*/
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queue_work(batadv_event_workqueue,
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&hardif_neigh->bat_v.metric_work);
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}
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rcu_read_unlock();
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restart_timer:
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batadv_v_elp_start_timer(hard_iface);
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out:
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return;
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}
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/**
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* batadv_v_elp_iface_enable() - setup the ELP interface private resources
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* @hard_iface: interface for which the data has to be prepared
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*
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* Return: 0 on success or a -ENOMEM in case of failure.
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*/
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int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface)
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{
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struct batadv_elp_packet *elp_packet;
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unsigned char *elp_buff;
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u32 random_seqno;
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size_t size;
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int res = -ENOMEM;
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size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN;
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hard_iface->bat_v.elp_skb = dev_alloc_skb(size);
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if (!hard_iface->bat_v.elp_skb)
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goto out;
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skb_reserve(hard_iface->bat_v.elp_skb, ETH_HLEN + NET_IP_ALIGN);
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elp_buff = skb_put_zero(hard_iface->bat_v.elp_skb, BATADV_ELP_HLEN);
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elp_packet = (struct batadv_elp_packet *)elp_buff;
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elp_packet->packet_type = BATADV_ELP;
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elp_packet->version = BATADV_COMPAT_VERSION;
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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_v.elp_seqno, random_seqno);
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/* assume full-duplex by default */
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hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX;
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/* warn the user (again) if there is no throughput data is available */
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hard_iface->bat_v.flags &= ~BATADV_WARNING_DEFAULT;
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if (batadv_is_wifi_hardif(hard_iface))
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hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX;
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INIT_DELAYED_WORK(&hard_iface->bat_v.elp_wq,
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batadv_v_elp_periodic_work);
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batadv_v_elp_start_timer(hard_iface);
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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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/**
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* batadv_v_elp_iface_disable() - release ELP interface private resources
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* @hard_iface: interface for which the resources have to be released
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*/
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void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface)
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{
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cancel_delayed_work_sync(&hard_iface->bat_v.elp_wq);
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dev_kfree_skb(hard_iface->bat_v.elp_skb);
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hard_iface->bat_v.elp_skb = NULL;
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}
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/**
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* batadv_v_elp_iface_activate() - update the ELP buffer belonging to the given
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* hard-interface
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* @primary_iface: the new primary interface
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* @hard_iface: interface holding the to-be-updated buffer
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*/
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void batadv_v_elp_iface_activate(struct batadv_hard_iface *primary_iface,
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struct batadv_hard_iface *hard_iface)
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{
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struct batadv_elp_packet *elp_packet;
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struct sk_buff *skb;
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if (!hard_iface->bat_v.elp_skb)
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return;
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skb = hard_iface->bat_v.elp_skb;
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elp_packet = (struct batadv_elp_packet *)skb->data;
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ether_addr_copy(elp_packet->orig,
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primary_iface->net_dev->dev_addr);
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}
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/**
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* batadv_v_elp_primary_iface_set() - change internal data to reflect the new
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* primary interface
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* @primary_iface: the new primary interface
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*/
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void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface)
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{
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struct batadv_hard_iface *hard_iface;
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/* update orig field of every elp iface belonging to this mesh */
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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 (primary_iface->soft_iface != hard_iface->soft_iface)
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continue;
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batadv_v_elp_iface_activate(primary_iface, hard_iface);
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}
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rcu_read_unlock();
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}
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/**
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* batadv_v_elp_neigh_update() - update an ELP neighbour node
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* @bat_priv: the bat priv with all the soft interface information
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* @neigh_addr: the neighbour interface address
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* @if_incoming: the interface the packet was received through
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* @elp_packet: the received ELP packet
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*
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* Updates the ELP neighbour node state with the data received within the new
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* ELP packet.
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*/
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static void batadv_v_elp_neigh_update(struct batadv_priv *bat_priv,
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u8 *neigh_addr,
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struct batadv_hard_iface *if_incoming,
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struct batadv_elp_packet *elp_packet)
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{
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struct batadv_neigh_node *neigh;
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struct batadv_orig_node *orig_neigh;
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struct batadv_hardif_neigh_node *hardif_neigh;
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s32 seqno_diff;
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s32 elp_latest_seqno;
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orig_neigh = batadv_v_ogm_orig_get(bat_priv, elp_packet->orig);
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if (!orig_neigh)
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return;
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neigh = batadv_neigh_node_get_or_create(orig_neigh,
|
|
if_incoming, neigh_addr);
|
|
if (!neigh)
|
|
goto orig_free;
|
|
|
|
hardif_neigh = batadv_hardif_neigh_get(if_incoming, neigh_addr);
|
|
if (!hardif_neigh)
|
|
goto neigh_free;
|
|
|
|
elp_latest_seqno = hardif_neigh->bat_v.elp_latest_seqno;
|
|
seqno_diff = ntohl(elp_packet->seqno) - elp_latest_seqno;
|
|
|
|
/* known or older sequence numbers are ignored. However always adopt
|
|
* if the router seems to have been restarted.
|
|
*/
|
|
if (seqno_diff < 1 && seqno_diff > -BATADV_ELP_MAX_AGE)
|
|
goto hardif_free;
|
|
|
|
neigh->last_seen = jiffies;
|
|
hardif_neigh->last_seen = jiffies;
|
|
hardif_neigh->bat_v.elp_latest_seqno = ntohl(elp_packet->seqno);
|
|
hardif_neigh->bat_v.elp_interval = ntohl(elp_packet->elp_interval);
|
|
|
|
hardif_free:
|
|
if (hardif_neigh)
|
|
batadv_hardif_neigh_put(hardif_neigh);
|
|
neigh_free:
|
|
if (neigh)
|
|
batadv_neigh_node_put(neigh);
|
|
orig_free:
|
|
if (orig_neigh)
|
|
batadv_orig_node_put(orig_neigh);
|
|
}
|
|
|
|
/**
|
|
* batadv_v_elp_packet_recv() - main ELP packet handler
|
|
* @skb: the received packet
|
|
* @if_incoming: the interface this packet was received through
|
|
*
|
|
* Return: NET_RX_SUCCESS and consumes the skb if the packet was peoperly
|
|
* processed or NET_RX_DROP in case of failure.
|
|
*/
|
|
int batadv_v_elp_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_elp_packet *elp_packet;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
bool res;
|
|
int ret = NET_RX_DROP;
|
|
|
|
res = batadv_check_management_packet(skb, if_incoming, BATADV_ELP_HLEN);
|
|
if (!res)
|
|
goto free_skb;
|
|
|
|
if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
|
|
goto free_skb;
|
|
|
|
/* did we receive a B.A.T.M.A.N. V ELP packet on an interface
|
|
* that does not have B.A.T.M.A.N. V ELP enabled ?
|
|
*/
|
|
if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0)
|
|
goto free_skb;
|
|
|
|
elp_packet = (struct batadv_elp_packet *)skb->data;
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Received ELP packet from %pM seqno %u ORIG: %pM\n",
|
|
ethhdr->h_source, ntohl(elp_packet->seqno),
|
|
elp_packet->orig);
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto free_skb;
|
|
|
|
batadv_v_elp_neigh_update(bat_priv, ethhdr->h_source, if_incoming,
|
|
elp_packet);
|
|
|
|
ret = NET_RX_SUCCESS;
|
|
batadv_hardif_put(primary_if);
|
|
|
|
free_skb:
|
|
if (ret == NET_RX_SUCCESS)
|
|
consume_skb(skb);
|
|
else
|
|
kfree_skb(skb);
|
|
|
|
return ret;
|
|
}
|