^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Copyright (C) 2011-2020 B.A.T.M.A.N. contributors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Linus Lüssing, Marek Lindner
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include "bat_v_elp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include "main.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/byteorder/generic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/etherdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/ethtool.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/if_ether.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/kref.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/nl80211.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/prandom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/rculist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <net/cfg80211.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <uapi/linux/batadv_packet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include "bat_algo.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include "bat_v_ogm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include "hard-interface.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include "log.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include "originator.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include "routing.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include "send.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * batadv_v_elp_start_timer() - restart timer for ELP periodic work
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * @hard_iface: the interface for which the timer has to be reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static void batadv_v_elp_start_timer(struct batadv_hard_iface *hard_iface)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned int msecs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) msecs = atomic_read(&hard_iface->bat_v.elp_interval) - BATADV_JITTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) msecs += prandom_u32_max(2 * BATADV_JITTER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.elp_wq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) msecs_to_jiffies(msecs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * batadv_v_elp_get_throughput() - get the throughput towards a neighbour
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * @neigh: the neighbour for which the throughput has to be obtained
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * Return: The throughput towards the given neighbour in multiples of 100kpbs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * (a value of '1' equals 0.1Mbps, '10' equals 1Mbps, etc).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct batadv_hard_iface *hard_iface = neigh->if_incoming;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct ethtool_link_ksettings link_settings;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct net_device *real_netdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct station_info sinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) u32 throughput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /* if the user specified a customised value for this interface, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * return it directly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) throughput = atomic_read(&hard_iface->bat_v.throughput_override);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (throughput != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return throughput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /* if this is a wireless device, then ask its throughput through
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * cfg80211 API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (batadv_is_wifi_hardif(hard_iface)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (!batadv_is_cfg80211_hardif(hard_iface))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /* unsupported WiFi driver version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) goto default_throughput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) real_netdev = batadv_get_real_netdev(hard_iface->net_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (!real_netdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) goto default_throughput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) ret = cfg80211_get_station(real_netdev, neigh->addr, &sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* free the TID stats immediately */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) cfg80211_sinfo_release_content(&sinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) dev_put(real_netdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (ret == -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /* Node is not associated anymore! It would be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * possible to delete this neighbor. For now set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * the throughput metric to 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) goto default_throughput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return sinfo.expected_throughput / 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* try to estimate the expected throughput based on reported tx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * rates
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (sinfo.filled & BIT(NL80211_STA_INFO_TX_BITRATE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return cfg80211_calculate_bitrate(&sinfo.txrate) / 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) goto default_throughput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* if not a wifi interface, check if this device provides data via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * ethtool (e.g. an Ethernet adapter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) memset(&link_settings, 0, sizeof(link_settings));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) rtnl_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) rtnl_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (ret == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /* link characteristics might change over time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (link_settings.base.duplex == DUPLEX_FULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) throughput = link_settings.base.speed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (throughput && throughput != SPEED_UNKNOWN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return throughput * 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) default_throughput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (!(hard_iface->bat_v.flags & BATADV_WARNING_DEFAULT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) batadv_info(hard_iface->soft_iface,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) "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",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) hard_iface->net_dev->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) BATADV_THROUGHPUT_DEFAULT_VALUE / 10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) BATADV_THROUGHPUT_DEFAULT_VALUE % 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) hard_iface->bat_v.flags |= BATADV_WARNING_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /* if none of the above cases apply, return the base_throughput */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return BATADV_THROUGHPUT_DEFAULT_VALUE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * batadv_v_elp_throughput_metric_update() - worker updating the throughput
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * metric of a single hop neighbour
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * @work: the work queue item
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) void batadv_v_elp_throughput_metric_update(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct batadv_hardif_neigh_node_bat_v *neigh_bat_v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) struct batadv_hardif_neigh_node *neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) neigh_bat_v = container_of(work, struct batadv_hardif_neigh_node_bat_v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) metric_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) neigh = container_of(neigh_bat_v, struct batadv_hardif_neigh_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) bat_v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) ewma_throughput_add(&neigh->bat_v.throughput,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) batadv_v_elp_get_throughput(neigh));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* decrement refcounter to balance increment performed before scheduling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * this task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) batadv_hardif_neigh_put(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * batadv_v_elp_wifi_neigh_probe() - send link probing packets to a neighbour
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * @neigh: the neighbour to probe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * Sends a predefined number of unicast wifi packets to a given neighbour in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * order to trigger the throughput estimation on this link by the RC algorithm.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * Packets are sent only if there is not enough payload unicast traffic towards
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * this neighbour..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * Return: True on success and false in case of error during skb preparation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static bool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) batadv_v_elp_wifi_neigh_probe(struct batadv_hardif_neigh_node *neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct batadv_hard_iface *hard_iface = neigh->if_incoming;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) unsigned long last_tx_diff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) int probe_len, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int elp_skb_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /* this probing routine is for Wifi neighbours only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (!batadv_is_wifi_hardif(hard_iface))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /* probe the neighbor only if no unicast packets have been sent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * to it in the last 100 milliseconds: this is the rate control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * algorithm sampling interval (minstrel). In this way, if not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * enough traffic has been sent to the neighbor, batman-adv can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * generate 2 probe packets and push the RC algorithm to perform
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * the sampling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) last_tx_diff = jiffies_to_msecs(jiffies - neigh->bat_v.last_unicast_tx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (last_tx_diff <= BATADV_ELP_PROBE_MAX_TX_DIFF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) probe_len = max_t(int, sizeof(struct batadv_elp_packet),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) BATADV_ELP_MIN_PROBE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) for (i = 0; i < BATADV_ELP_PROBES_PER_NODE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) elp_skb_len = hard_iface->bat_v.elp_skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) skb = skb_copy_expand(hard_iface->bat_v.elp_skb, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) probe_len - elp_skb_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) /* Tell the skb to get as big as the allocated space (we want
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * the packet to be exactly of that size to make the link
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * throughput estimation effective.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) skb_put_zero(skb, probe_len - hard_iface->bat_v.elp_skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) "Sending unicast (probe) ELP packet on interface %s to %pM\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) hard_iface->net_dev->name, neigh->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) batadv_send_skb_packet(skb, hard_iface, neigh->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * batadv_v_elp_periodic_work() - ELP periodic task per interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * @work: work queue item
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * Emits broadcast ELP messages in regular intervals.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static void batadv_v_elp_periodic_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) struct batadv_hardif_neigh_node *hardif_neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct batadv_hard_iface *hard_iface;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct batadv_hard_iface_bat_v *bat_v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) struct batadv_elp_packet *elp_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct batadv_priv *bat_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) u32 elp_interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) bool ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) bat_priv = netdev_priv(hard_iface->soft_iface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) /* we are in the process of shutting this interface down */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (hard_iface->if_status == BATADV_IF_NOT_IN_USE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) /* the interface was enabled but may not be ready yet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if (hard_iface->if_status != BATADV_IF_ACTIVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) goto restart_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) skb = skb_copy(hard_iface->bat_v.elp_skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) goto restart_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) elp_packet = (struct batadv_elp_packet *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) elp_packet->seqno = htonl(atomic_read(&hard_iface->bat_v.elp_seqno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) elp_interval = atomic_read(&hard_iface->bat_v.elp_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) elp_packet->elp_interval = htonl(elp_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) "Sending broadcast ELP packet on interface %s, seqno %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) hard_iface->net_dev->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) atomic_read(&hard_iface->bat_v.elp_seqno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) batadv_send_broadcast_skb(skb, hard_iface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) atomic_inc(&hard_iface->bat_v.elp_seqno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /* The throughput metric is updated on each sent packet. This way, if a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * node is dead and no longer sends packets, batman-adv is still able to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * react timely to its death.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) * The throughput metric is updated by following these steps:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) * 1) if the hard_iface is wifi => send a number of unicast ELPs for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * probing/sampling to each neighbor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * 2) update the throughput metric value of each neighbor (note that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * value retrieved in this step might be 100ms old because the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * probing packets at point 1) could still be in the HW queue)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) hlist_for_each_entry_rcu(hardif_neigh, &hard_iface->neigh_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) if (!batadv_v_elp_wifi_neigh_probe(hardif_neigh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /* if something goes wrong while probing, better to stop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * sending packets immediately and reschedule the task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (!kref_get_unless_zero(&hardif_neigh->refcount))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) /* Reading the estimated throughput from cfg80211 is a task that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * may sleep and that is not allowed in an rcu protected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) * context. Therefore schedule a task for that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) ret = queue_work(batadv_event_workqueue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) &hardif_neigh->bat_v.metric_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) batadv_hardif_neigh_put(hardif_neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) restart_timer:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) batadv_v_elp_start_timer(hard_iface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * batadv_v_elp_iface_enable() - setup the ELP interface private resources
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * @hard_iface: interface for which the data has to be prepared
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * Return: 0 on success or a -ENOMEM in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) static const size_t tvlv_padding = sizeof(__be32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) struct batadv_elp_packet *elp_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) unsigned char *elp_buff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) u32 random_seqno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) int res = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN + tvlv_padding;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) hard_iface->bat_v.elp_skb = dev_alloc_skb(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (!hard_iface->bat_v.elp_skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) skb_reserve(hard_iface->bat_v.elp_skb, ETH_HLEN + NET_IP_ALIGN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) elp_buff = skb_put_zero(hard_iface->bat_v.elp_skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) BATADV_ELP_HLEN + tvlv_padding);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) elp_packet = (struct batadv_elp_packet *)elp_buff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) elp_packet->packet_type = BATADV_ELP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) elp_packet->version = BATADV_COMPAT_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) /* randomize initial seqno to avoid collision */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) get_random_bytes(&random_seqno, sizeof(random_seqno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) atomic_set(&hard_iface->bat_v.elp_seqno, random_seqno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) /* assume full-duplex by default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) /* warn the user (again) if there is no throughput data is available */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) hard_iface->bat_v.flags &= ~BATADV_WARNING_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (batadv_is_wifi_hardif(hard_iface))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) INIT_DELAYED_WORK(&hard_iface->bat_v.elp_wq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) batadv_v_elp_periodic_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) batadv_v_elp_start_timer(hard_iface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * batadv_v_elp_iface_disable() - release ELP interface private resources
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * @hard_iface: interface for which the resources have to be released
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) cancel_delayed_work_sync(&hard_iface->bat_v.elp_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) dev_kfree_skb(hard_iface->bat_v.elp_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) hard_iface->bat_v.elp_skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) * batadv_v_elp_iface_activate() - update the ELP buffer belonging to the given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) * hard-interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) * @primary_iface: the new primary interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) * @hard_iface: interface holding the to-be-updated buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) void batadv_v_elp_iface_activate(struct batadv_hard_iface *primary_iface,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) struct batadv_hard_iface *hard_iface)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) struct batadv_elp_packet *elp_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (!hard_iface->bat_v.elp_skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) skb = hard_iface->bat_v.elp_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) elp_packet = (struct batadv_elp_packet *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) ether_addr_copy(elp_packet->orig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) primary_iface->net_dev->dev_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * batadv_v_elp_primary_iface_set() - change internal data to reflect the new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * primary interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) * @primary_iface: the new primary interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) struct batadv_hard_iface *hard_iface;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) /* update orig field of every elp iface belonging to this mesh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (primary_iface->soft_iface != hard_iface->soft_iface)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) batadv_v_elp_iface_activate(primary_iface, hard_iface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * batadv_v_elp_neigh_update() - update an ELP neighbour node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) * @neigh_addr: the neighbour interface address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) * @if_incoming: the interface the packet was received through
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) * @elp_packet: the received ELP packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * Updates the ELP neighbour node state with the data received within the new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) * ELP packet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) static void batadv_v_elp_neigh_update(struct batadv_priv *bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) u8 *neigh_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) struct batadv_hard_iface *if_incoming,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) struct batadv_elp_packet *elp_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) struct batadv_neigh_node *neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) struct batadv_orig_node *orig_neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) struct batadv_hardif_neigh_node *hardif_neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) s32 seqno_diff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) s32 elp_latest_seqno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) orig_neigh = batadv_v_ogm_orig_get(bat_priv, elp_packet->orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (!orig_neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) neigh = batadv_neigh_node_get_or_create(orig_neigh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) if_incoming, neigh_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) if (!neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) goto orig_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) hardif_neigh = batadv_hardif_neigh_get(if_incoming, neigh_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (!hardif_neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) goto neigh_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) elp_latest_seqno = hardif_neigh->bat_v.elp_latest_seqno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) seqno_diff = ntohl(elp_packet->seqno) - elp_latest_seqno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) /* known or older sequence numbers are ignored. However always adopt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) * if the router seems to have been restarted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (seqno_diff < 1 && seqno_diff > -BATADV_ELP_MAX_AGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) goto hardif_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) neigh->last_seen = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) hardif_neigh->last_seen = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) hardif_neigh->bat_v.elp_latest_seqno = ntohl(elp_packet->seqno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) hardif_neigh->bat_v.elp_interval = ntohl(elp_packet->elp_interval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) hardif_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) if (hardif_neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) batadv_hardif_neigh_put(hardif_neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) neigh_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) batadv_neigh_node_put(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) orig_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) if (orig_neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) batadv_orig_node_put(orig_neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * batadv_v_elp_packet_recv() - main ELP packet handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * @skb: the received packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * @if_incoming: the interface this packet was received through
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) * Return: NET_RX_SUCCESS and consumes the skb if the packet was properly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * processed or NET_RX_DROP in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) int batadv_v_elp_packet_recv(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) struct batadv_hard_iface *if_incoming)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) struct batadv_elp_packet *elp_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) struct batadv_hard_iface *primary_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) bool res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) int ret = NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) res = batadv_check_management_packet(skb, if_incoming, BATADV_ELP_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (!res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (batadv_is_my_mac(bat_priv, ethhdr->h_source))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) /* did we receive a B.A.T.M.A.N. V ELP packet on an interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) * that does not have B.A.T.M.A.N. V ELP enabled ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) elp_packet = (struct batadv_elp_packet *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) "Received ELP packet from %pM seqno %u ORIG: %pM\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) ethhdr->h_source, ntohl(elp_packet->seqno),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) elp_packet->orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) primary_if = batadv_primary_if_get_selected(bat_priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) if (!primary_if)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) batadv_v_elp_neigh_update(bat_priv, ethhdr->h_source, if_incoming,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) elp_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) ret = NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) batadv_hardif_put(primary_if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) free_skb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) if (ret == NET_RX_SUCCESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags