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OpenCloudOS-Kernel/net/mac80211/mesh.c

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/*
* Copyright (c) 2008, 2009 open80211s Ltd.
* Authors: Luis Carlos Cobo <luisca@cozybit.com>
* Javier Cardona <javier@cozybit.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/slab.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "mesh.h"
#include "driver-ops.h"
static int mesh_allocated;
static struct kmem_cache *rm_cache;
bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
{
return (mgmt->u.action.u.mesh_action.action_code ==
WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
}
void ieee80211s_init(void)
{
mesh_pathtbl_init();
mesh_allocated = 1;
rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
0, 0, NULL);
}
void ieee80211s_stop(void)
{
if (!mesh_allocated)
return;
mesh_pathtbl_unregister();
kmem_cache_destroy(rm_cache);
}
static void ieee80211_mesh_housekeeping_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata = (void *) data;
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
ieee80211_queue_work(&local->hw, &sdata->work);
}
/**
* mesh_matches_local - check if the config of a mesh point matches ours
*
* @sdata: local mesh subif
* @ie: information elements of a management frame from the mesh peer
*
* This function checks if the mesh configuration of a mesh point matches the
* local mesh configuration, i.e. if both nodes belong to the same mesh network.
*/
bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
struct ieee802_11_elems *ie)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u32 basic_rates = 0;
struct cfg80211_chan_def sta_chan_def;
/*
* As support for each feature is added, check for matching
* - On mesh config capabilities
* - Power Save Support En
* - Sync support enabled
* - Sync support active
* - Sync support required from peer
* - MDA enabled
* - Power management control on fc
*/
if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
(ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
(ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
(ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
(ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
(ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
return false;
ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
&basic_rates);
if (sdata->vif.bss_conf.basic_rates != basic_rates)
return false;
ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
ie->ht_operation, &sta_chan_def);
if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
&sta_chan_def))
return false;
return true;
}
/**
* mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
*
* @ie: information elements of a management frame from the mesh peer
*/
bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
{
return (ie->mesh_config->meshconf_cap &
IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
}
/**
* mesh_accept_plinks_update - update accepting_plink in local mesh beacons
*
* @sdata: mesh interface in which mesh beacons are going to be updated
*
* Returns: beacon changed flag if the beacon content changed.
*/
u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
{
bool free_plinks;
u32 changed = 0;
/* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
* the mesh interface might be able to establish plinks with peers that
* are already on the table but are not on PLINK_ESTAB state. However,
* in general the mesh interface is not accepting peer link requests
* from new peers, and that must be reflected in the beacon
*/
free_plinks = mesh_plink_availables(sdata);
if (free_plinks != sdata->u.mesh.accepting_plinks) {
sdata->u.mesh.accepting_plinks = free_plinks;
changed = BSS_CHANGED_BEACON;
}
return changed;
}
/*
* mesh_sta_cleanup - clean up any mesh sta state
*
* @sta: mesh sta to clean up.
*/
void mesh_sta_cleanup(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
u32 changed;
/*
* maybe userspace handles peer allocation and peering, but in either
* case the beacon is still generated by the kernel and we might need
* an update.
*/
changed = mesh_accept_plinks_update(sdata);
if (!sdata->u.mesh.user_mpm) {
changed |= mesh_plink_deactivate(sta);
del_timer_sync(&sta->plink_timer);
}
if (changed)
ieee80211_mbss_info_change_notify(sdata, changed);
}
int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
{
int i;
sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
if (!sdata->u.mesh.rmc)
return -ENOMEM;
sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
for (i = 0; i < RMC_BUCKETS; i++)
INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
return 0;
}
void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
{
struct mesh_rmc *rmc = sdata->u.mesh.rmc;
struct rmc_entry *p, *n;
int i;
if (!sdata->u.mesh.rmc)
return;
for (i = 0; i < RMC_BUCKETS; i++) {
list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
list_del(&p->list);
kmem_cache_free(rm_cache, p);
}
}
kfree(rmc);
sdata->u.mesh.rmc = NULL;
}
/**
* mesh_rmc_check - Check frame in recent multicast cache and add if absent.
*
* @sdata: interface
* @sa: source address
* @mesh_hdr: mesh_header
*
* Returns: 0 if the frame is not in the cache, nonzero otherwise.
*
* Checks using the source address and the mesh sequence number if we have
* received this frame lately. If the frame is not in the cache, it is added to
* it.
*/
int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
{
struct mesh_rmc *rmc = sdata->u.mesh.rmc;
u32 seqnum = 0;
int entries = 0;
u8 idx;
struct rmc_entry *p, *n;
/* Don't care about endianness since only match matters */
memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
++entries;
if (time_after(jiffies, p->exp_time) ||
entries == RMC_QUEUE_MAX_LEN) {
list_del(&p->list);
kmem_cache_free(rm_cache, p);
--entries;
} else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
return -1;
}
p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
if (!p)
return 0;
p->seqnum = seqnum;
p->exp_time = jiffies + RMC_TIMEOUT;
memcpy(p->sa, sa, ETH_ALEN);
list_add(&p->list, &rmc->bucket[idx]);
return 0;
}
int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u8 *pos, neighbors;
u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
if (skb_tailroom(skb) < 2 + meshconf_len)
return -ENOMEM;
pos = skb_put(skb, 2 + meshconf_len);
*pos++ = WLAN_EID_MESH_CONFIG;
*pos++ = meshconf_len;
/* Active path selection protocol ID */
*pos++ = ifmsh->mesh_pp_id;
/* Active path selection metric ID */
*pos++ = ifmsh->mesh_pm_id;
/* Congestion control mode identifier */
*pos++ = ifmsh->mesh_cc_id;
/* Synchronization protocol identifier */
*pos++ = ifmsh->mesh_sp_id;
/* Authentication Protocol identifier */
*pos++ = ifmsh->mesh_auth_id;
/* Mesh Formation Info - number of neighbors */
neighbors = atomic_read(&ifmsh->estab_plinks);
neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
*pos++ = neighbors << 1;
/* Mesh capability */
*pos = 0x00;
*pos |= ifmsh->mshcfg.dot11MeshForwarding ?
IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
*pos |= ifmsh->accepting_plinks ?
IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
/* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
*pos |= ifmsh->ps_peers_deep_sleep ?
IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
*pos++ |= ifmsh->adjusting_tbtt ?
IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
*pos++ = 0x00;
return 0;
}
int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u8 *pos;
if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
return -ENOMEM;
pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
*pos++ = WLAN_EID_MESH_ID;
*pos++ = ifmsh->mesh_id_len;
if (ifmsh->mesh_id_len)
memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
return 0;
}
static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u8 *pos;
/* see IEEE802.11-2012 13.14.6 */
if (ifmsh->ps_peers_light_sleep == 0 &&
ifmsh->ps_peers_deep_sleep == 0 &&
ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
return 0;
if (skb_tailroom(skb) < 4)
return -ENOMEM;
pos = skb_put(skb, 2 + 2);
*pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
*pos++ = 2;
put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
return 0;
}
int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u8 offset, len;
const u8 *data;
if (!ifmsh->ie || !ifmsh->ie_len)
return 0;
/* fast-forward to vendor IEs */
offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
if (offset) {
len = ifmsh->ie_len - offset;
data = ifmsh->ie + offset;
if (skb_tailroom(skb) < len)
return -ENOMEM;
memcpy(skb_put(skb, len), data, len);
}
return 0;
}
int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u8 len = 0;
const u8 *data;
if (!ifmsh->ie || !ifmsh->ie_len)
return 0;
/* find RSN IE */
data = ifmsh->ie;
while (data < ifmsh->ie + ifmsh->ie_len) {
if (*data == WLAN_EID_RSN) {
len = data[1] + 2;
break;
}
data++;
}
if (len) {
if (skb_tailroom(skb) < len)
return -ENOMEM;
memcpy(skb_put(skb, len), data, len);
}
return 0;
}
static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_chanctx_conf *chanctx_conf;
struct ieee80211_channel *chan;
u8 *pos;
if (skb_tailroom(skb) < 3)
return -ENOMEM;
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (WARN_ON(!chanctx_conf)) {
rcu_read_unlock();
return -EINVAL;
}
chan = chanctx_conf->def.chan;
rcu_read_unlock();
pos = skb_put(skb, 2 + 1);
*pos++ = WLAN_EID_DS_PARAMS;
*pos++ = 1;
*pos++ = ieee80211_frequency_to_channel(chan->center_freq);
return 0;
}
int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
struct ieee80211_supported_band *sband;
u8 *pos;
sband = local->hw.wiphy->bands[band];
if (!sband->ht_cap.ht_supported ||
sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
return 0;
if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
return -ENOMEM;
pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
return 0;
}
int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *chanctx_conf;
struct ieee80211_channel *channel;
enum nl80211_channel_type channel_type =
cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
struct ieee80211_supported_band *sband;
struct ieee80211_sta_ht_cap *ht_cap;
u8 *pos;
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (WARN_ON(!chanctx_conf)) {
rcu_read_unlock();
return -EINVAL;
}
channel = chanctx_conf->def.chan;
rcu_read_unlock();
sband = local->hw.wiphy->bands[channel->band];
ht_cap = &sband->ht_cap;
if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
return 0;
if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
return -ENOMEM;
pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
sdata->vif.bss_conf.ht_operation_mode);
return 0;
}
static void ieee80211_mesh_path_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
ieee80211_queue_work(&sdata->local->hw, &sdata->work);
}
static void ieee80211_mesh_path_root_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
ieee80211_queue_work(&sdata->local->hw, &sdata->work);
}
void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
{
if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
else {
clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
/* stop running timer */
del_timer_sync(&ifmsh->mesh_path_root_timer);
}
}
/**
* ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
* @hdr: 802.11 frame header
* @fc: frame control field
* @meshda: destination address in the mesh
* @meshsa: source address address in the mesh. Same as TA, as frame is
* locally originated.
*
* Return the length of the 802.11 (does not include a mesh control header)
*/
int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
const u8 *meshda, const u8 *meshsa)
{
if (is_multicast_ether_addr(meshda)) {
*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
/* DA TA SA */
memcpy(hdr->addr1, meshda, ETH_ALEN);
memcpy(hdr->addr2, meshsa, ETH_ALEN);
memcpy(hdr->addr3, meshsa, ETH_ALEN);
return 24;
} else {
*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
/* RA TA DA SA */
memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
memcpy(hdr->addr2, meshsa, ETH_ALEN);
memcpy(hdr->addr3, meshda, ETH_ALEN);
memcpy(hdr->addr4, meshsa, ETH_ALEN);
return 30;
}
}
/**
* ieee80211_new_mesh_header - create a new mesh header
* @sdata: mesh interface to be used
* @meshhdr: uninitialized mesh header
* @addr4or5: 1st address in the ae header, which may correspond to address 4
* (if addr6 is NULL) or address 5 (if addr6 is present). It may
* be NULL.
* @addr6: 2nd address in the ae header, which corresponds to addr6 of the
* mesh frame
*
* Return the header length.
*/
int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
struct ieee80211s_hdr *meshhdr,
const char *addr4or5, const char *addr6)
{
if (WARN_ON(!addr4or5 && addr6))
return 0;
memset(meshhdr, 0, sizeof(*meshhdr));
meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
/* FIXME: racy -- TX on multiple queues can be concurrent */
put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
sdata->u.mesh.mesh_seqnum++;
if (addr4or5 && !addr6) {
meshhdr->flags |= MESH_FLAGS_AE_A4;
memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
return 2 * ETH_ALEN;
} else if (addr4or5 && addr6) {
meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
return 3 * ETH_ALEN;
}
return ETH_ALEN;
}
static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u32 changed;
ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
mesh_path_expire(sdata);
changed = mesh_accept_plinks_update(sdata);
ieee80211_mbss_info_change_notify(sdata, changed);
mod_timer(&ifmsh->housekeeping_timer,
round_jiffies(jiffies +
IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
}
static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u32 interval;
mesh_path_tx_root_frame(sdata);
if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
else
interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
mod_timer(&ifmsh->mesh_path_root_timer,
round_jiffies(TU_TO_EXP_TIME(interval)));
}
static int
ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
{
struct beacon_data *bcn;
int head_len, tail_len;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
struct ieee80211_chanctx_conf *chanctx_conf;
struct mesh_csa_settings *csa;
enum ieee80211_band band;
u8 *pos;
struct ieee80211_sub_if_data *sdata;
int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
sizeof(mgmt->u.beacon);
sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
band = chanctx_conf->def.chan->band;
rcu_read_unlock();
head_len = hdr_len +
2 + /* NULL SSID */
/* Channel Switch Announcement */
2 + sizeof(struct ieee80211_channel_sw_ie) +
/* Mesh Channel Swith Parameters */
2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
2 + 8 + /* supported rates */
2 + 3; /* DS params */
tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2 + sizeof(struct ieee80211_ht_cap) +
2 + sizeof(struct ieee80211_ht_operation) +
2 + ifmsh->mesh_id_len +
2 + sizeof(struct ieee80211_meshconf_ie) +
2 + sizeof(__le16) + /* awake window */
ifmsh->ie_len;
bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
/* need an skb for IE builders to operate on */
skb = dev_alloc_skb(max(head_len, tail_len));
if (!bcn || !skb)
goto out_free;
/*
* pointers go into the block we allocated,
* memory is | beacon_data | head | tail |
*/
bcn->head = ((u8 *) bcn) + sizeof(*bcn);
/* fill in the head */
mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
memset(mgmt, 0, hdr_len);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_BEACON);
eth_broadcast_addr(mgmt->da);
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
mgmt->u.beacon.beacon_int =
cpu_to_le16(sdata->vif.bss_conf.beacon_int);
mgmt->u.beacon.capab_info |= cpu_to_le16(
sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
pos = skb_put(skb, 2);
*pos++ = WLAN_EID_SSID;
*pos++ = 0x0;
rcu_read_lock();
csa = rcu_dereference(ifmsh->csa);
if (csa) {
__le16 pre_value;
pos = skb_put(skb, 13);
memset(pos, 0, 13);
*pos++ = WLAN_EID_CHANNEL_SWITCH;
*pos++ = 3;
*pos++ = 0x0;
*pos++ = ieee80211_frequency_to_channel(
csa->settings.chandef.chan->center_freq);
sdata->csa_counter_offset_beacon = hdr_len + 6;
*pos++ = csa->settings.count;
*pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
*pos++ = 6;
if (ifmsh->chsw_init) {
*pos++ = ifmsh->mshcfg.dot11MeshTTL;
*pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
} else {
*pos++ = ifmsh->chsw_ttl;
}
*pos++ |= csa->settings.block_tx ?
WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
pos += 2;
pre_value = cpu_to_le16(ifmsh->pre_value);
memcpy(pos, &pre_value, 2);
pos += 2;
}
rcu_read_unlock();
if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
mesh_add_ds_params_ie(sdata, skb))
goto out_free;
bcn->head_len = skb->len;
memcpy(bcn->head, skb->data, bcn->head_len);
/* now the tail */
skb_trim(skb, 0);
bcn->tail = bcn->head + bcn->head_len;
if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
mesh_add_rsn_ie(sdata, skb) ||
mesh_add_ht_cap_ie(sdata, skb) ||
mesh_add_ht_oper_ie(sdata, skb) ||
mesh_add_meshid_ie(sdata, skb) ||
mesh_add_meshconf_ie(sdata, skb) ||
mesh_add_awake_window_ie(sdata, skb) ||
mesh_add_vendor_ies(sdata, skb))
goto out_free;
bcn->tail_len = skb->len;
memcpy(bcn->tail, skb->data, bcn->tail_len);
dev_kfree_skb(skb);
rcu_assign_pointer(ifmsh->beacon, bcn);
return 0;
out_free:
kfree(bcn);
dev_kfree_skb(skb);
return -ENOMEM;
}
static int
ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
{
struct beacon_data *old_bcn;
int ret;
old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
lockdep_is_held(&sdata->wdev.mtx));
ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
if (ret)
/* just reuse old beacon */
return ret;
if (old_bcn)
kfree_rcu(old_bcn, rcu_head);
return 0;
}
void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
u32 changed)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
unsigned long bits = changed;
u32 bit;
if (!bits)
return;
/* if we race with running work, worst case this work becomes a noop */
for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
set_bit(bit, &ifmsh->mbss_changed);
set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
ieee80211_queue_work(&sdata->local->hw, &sdata->work);
}
int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct ieee80211_local *local = sdata->local;
u32 changed = BSS_CHANGED_BEACON |
BSS_CHANGED_BEACON_ENABLED |
BSS_CHANGED_HT |
BSS_CHANGED_BASIC_RATES |
BSS_CHANGED_BEACON_INT;
local->fif_other_bss++;
/* mesh ifaces must set allmulti to forward mcast traffic */
atomic_inc(&local->iff_allmultis);
ieee80211_configure_filter(local);
ifmsh->mesh_cc_id = 0; /* Disabled */
/* register sync ops from extensible synchronization framework */
ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
ifmsh->adjusting_tbtt = false;
ifmsh->sync_offset_clockdrift_max = 0;
set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
ieee80211_mesh_root_setup(ifmsh);
ieee80211_queue_work(&local->hw, &sdata->work);
sdata->vif.bss_conf.ht_operation_mode =
ifmsh->mshcfg.ht_opmode;
sdata->vif.bss_conf.enable_beacon = true;
changed |= ieee80211_mps_local_status_update(sdata);
if (ieee80211_mesh_build_beacon(ifmsh)) {
ieee80211_stop_mesh(sdata);
return -ENOMEM;
}
ieee80211_bss_info_change_notify(sdata, changed);
netif_carrier_on(sdata->dev);
return 0;
}
void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct beacon_data *bcn;
netif_carrier_off(sdata->dev);
/* stop the beacon */
ifmsh->mesh_id_len = 0;
sdata->vif.bss_conf.enable_beacon = false;
clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
bcn = rcu_dereference_protected(ifmsh->beacon,
lockdep_is_held(&sdata->wdev.mtx));
rcu_assign_pointer(ifmsh->beacon, NULL);
kfree_rcu(bcn, rcu_head);
/* flush STAs and mpaths on this iface */
sta_info_flush(sdata);
mesh_path_flush_by_iface(sdata);
/* free all potentially still buffered group-addressed frames */
local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
skb_queue_purge(&ifmsh->ps.bc_buf);
del_timer_sync(&sdata->u.mesh.housekeeping_timer);
del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
del_timer_sync(&sdata->u.mesh.mesh_path_timer);
/* clear any mesh work (for next join) we may have accrued */
ifmsh->wrkq_flags = 0;
ifmsh->mbss_changed = 0;
local->fif_other_bss--;
atomic_dec(&local->iff_allmultis);
ieee80211_configure_filter(local);
}
static bool
ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
struct ieee802_11_elems *elems, bool beacon)
{
struct cfg80211_csa_settings params;
struct ieee80211_csa_ie csa_ie;
struct ieee80211_chanctx_conf *chanctx_conf;
struct ieee80211_chanctx *chanctx;
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
int err, num_chanctx;
u32 sta_flags;
if (sdata->vif.csa_active)
return true;
if (!ifmsh->mesh_id)
return false;
sta_flags = IEEE80211_STA_DISABLE_VHT;
switch (sdata->vif.bss_conf.chandef.width) {
case NL80211_CHAN_WIDTH_20_NOHT:
sta_flags |= IEEE80211_STA_DISABLE_HT;
case NL80211_CHAN_WIDTH_20:
sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
break;
default:
break;
}
memset(&params, 0, sizeof(params));
memset(&csa_ie, 0, sizeof(csa_ie));
err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, band,
sta_flags, sdata->vif.addr,
&csa_ie);
if (err < 0)
return false;
if (err)
return false;
params.chandef = csa_ie.chandef;
params.count = csa_ie.count;
if (sdata->vif.bss_conf.chandef.chan->band !=
params.chandef.chan->band)
return false;
if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
IEEE80211_CHAN_DISABLED)) {
sdata_info(sdata,
"mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
sdata->vif.addr,
params.chandef.chan->center_freq,
params.chandef.width,
params.chandef.center_freq1,
params.chandef.center_freq2);
return false;
}
err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
&params.chandef);
if (err < 0)
return false;
if (err) {
params.radar_required = true;
/* TODO: DFS not (yet) supported */
return false;
}
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (!chanctx_conf)
goto failed_chswitch;
/* don't handle for multi-VIF cases */
chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
if (chanctx->refcount > 1)
goto failed_chswitch;
num_chanctx = 0;
list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
num_chanctx++;
if (num_chanctx > 1)
goto failed_chswitch;
rcu_read_unlock();
mcsa_dbg(sdata,
"received channel switch announcement to go to channel %d MHz\n",
params.chandef.chan->center_freq);
params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
if (beacon)
ifmsh->chsw_ttl = csa_ie.ttl - 1;
else
ifmsh->chsw_ttl = 0;
if (ifmsh->chsw_ttl > 0)
if (ieee80211_mesh_csa_beacon(sdata, &params, false) < 0)
return false;
sdata->csa_radar_required = params.radar_required;
if (params.block_tx)
ieee80211_stop_queues_by_reason(&sdata->local->hw,
IEEE80211_MAX_QUEUE_MAP,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->local->csa_chandef = params.chandef;
sdata->vif.csa_active = true;
ieee80211_bss_info_change_notify(sdata, err);
drv_channel_switch_beacon(sdata, &params.chandef);
return true;
failed_chswitch:
rcu_read_unlock();
return false;
}
static void
ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct sk_buff *presp;
struct beacon_data *bcn;
struct ieee80211_mgmt *hdr;
struct ieee802_11_elems elems;
size_t baselen;
u8 *pos;
pos = mgmt->u.probe_req.variable;
baselen = (u8 *) pos - (u8 *) mgmt;
if (baselen > len)
return;
ieee802_11_parse_elems(pos, len - baselen, false, &elems);
if (!elems.mesh_id)
return;
/* 802.11-2012 10.1.4.3.2 */
if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
!is_broadcast_ether_addr(mgmt->da)) ||
elems.ssid_len != 0)
return;
if (elems.mesh_id_len != 0 &&
(elems.mesh_id_len != ifmsh->mesh_id_len ||
memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
return;
rcu_read_lock();
bcn = rcu_dereference(ifmsh->beacon);
if (!bcn)
goto out;
presp = dev_alloc_skb(local->tx_headroom +
bcn->head_len + bcn->tail_len);
if (!presp)
goto out;
skb_reserve(presp, local->tx_headroom);
memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
hdr = (struct ieee80211_mgmt *) presp->data;
hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_PROBE_RESP);
memcpy(hdr->da, mgmt->sa, ETH_ALEN);
IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
ieee80211_tx_skb(sdata, presp);
out:
rcu_read_unlock();
}
static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
u16 stype,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct ieee802_11_elems elems;
struct ieee80211_channel *channel;
size_t baselen;
int freq;
enum ieee80211_band band = rx_status->band;
/* ignore ProbeResp to foreign address */
if (stype == IEEE80211_STYPE_PROBE_RESP &&
!ether_addr_equal(mgmt->da, sdata->vif.addr))
return;
baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
if (baselen > len)
return;
ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
false, &elems);
/* ignore non-mesh or secure / unsecure mismatch */
if ((!elems.mesh_id || !elems.mesh_config) ||
(elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
(!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
return;
if (elems.ds_params)
freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
else
freq = rx_status->freq;
channel = ieee80211_get_channel(local->hw.wiphy, freq);
if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
return;
if (mesh_matches_local(sdata, &elems))
mesh_neighbour_update(sdata, mgmt->sa, &elems);
if (ifmsh->sync_ops)
ifmsh->sync_ops->rx_bcn_presp(sdata,
stype, mgmt, &elems, rx_status);
if (!ifmsh->chsw_init)
ieee80211_mesh_process_chnswitch(sdata, &elems, true);
}
int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct mesh_csa_settings *tmp_csa_settings;
int ret = 0;
/* Reset the TTL value and Initiator flag */
ifmsh->chsw_init = false;
ifmsh->chsw_ttl = 0;
/* Remove the CSA and MCSP elements from the beacon */
tmp_csa_settings = rcu_dereference(ifmsh->csa);
rcu_assign_pointer(ifmsh->csa, NULL);
kfree_rcu(tmp_csa_settings, rcu_head);
ret = ieee80211_mesh_rebuild_beacon(sdata);
if (ret)
return -EINVAL;
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
mcsa_dbg(sdata, "complete switching to center freq %d MHz",
sdata->vif.bss_conf.chandef.chan->center_freq);
return 0;
}
int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
struct cfg80211_csa_settings *csa_settings,
bool csa_action)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct mesh_csa_settings *tmp_csa_settings;
int ret = 0;
tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
GFP_ATOMIC);
if (!tmp_csa_settings)
return -ENOMEM;
memcpy(&tmp_csa_settings->settings, csa_settings,
sizeof(struct cfg80211_csa_settings));
rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
ret = ieee80211_mesh_rebuild_beacon(sdata);
if (ret) {
tmp_csa_settings = rcu_dereference(ifmsh->csa);
rcu_assign_pointer(ifmsh->csa, NULL);
kfree_rcu(tmp_csa_settings, rcu_head);
return ret;
}
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
if (csa_action)
ieee80211_send_action_csa(sdata, csa_settings);
return 0;
}
static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_mgmt *mgmt_fwd;
struct sk_buff *skb;
struct ieee80211_local *local = sdata->local;
u8 *pos = mgmt->u.action.u.chan_switch.variable;
size_t offset_ttl;
skb = dev_alloc_skb(local->tx_headroom + len);
if (!skb)
return -ENOMEM;
skb_reserve(skb, local->tx_headroom);
mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
/* offset_ttl is based on whether the secondary channel
* offset is available or not. Substract 1 from the mesh TTL
* and disable the initiator flag before forwarding.
*/
offset_ttl = (len < 42) ? 7 : 10;
*(pos + offset_ttl) -= 1;
*(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
sdata->u.mesh.chsw_ttl = *(pos + offset_ttl);
memcpy(mgmt_fwd, mgmt, len);
eth_broadcast_addr(mgmt_fwd->da);
memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
ieee80211_tx_skb(sdata, skb);
return 0;
}
static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct ieee802_11_elems elems;
u16 pre_value;
bool fwd_csa = true;
size_t baselen;
u8 *pos, ttl;
if (mgmt->u.action.u.measurement.action_code !=
WLAN_ACTION_SPCT_CHL_SWITCH)
return;
pos = mgmt->u.action.u.chan_switch.variable;
baselen = offsetof(struct ieee80211_mgmt,
u.action.u.chan_switch.variable);
ieee802_11_parse_elems(pos, len - baselen, false, &elems);
ttl = elems.mesh_chansw_params_ie->mesh_ttl;
if (!--ttl)
fwd_csa = false;
pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
if (ifmsh->pre_value >= pre_value)
return;
ifmsh->pre_value = pre_value;
if (!ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
mcsa_dbg(sdata, "Failed to process CSA action frame");
return;
}
/* forward or re-broadcast the CSA frame */
if (fwd_csa) {
if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
mcsa_dbg(sdata, "Failed to forward the CSA frame");
}
}
static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee80211_rx_status *rx_status)
{
switch (mgmt->u.action.category) {
case WLAN_CATEGORY_SELF_PROTECTED:
switch (mgmt->u.action.u.self_prot.action_code) {
case WLAN_SP_MESH_PEERING_OPEN:
case WLAN_SP_MESH_PEERING_CLOSE:
case WLAN_SP_MESH_PEERING_CONFIRM:
mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
break;
}
break;
case WLAN_CATEGORY_MESH_ACTION:
if (mesh_action_is_path_sel(mgmt))
mesh_rx_path_sel_frame(sdata, mgmt, len);
break;
case WLAN_CATEGORY_SPECTRUM_MGMT:
mesh_rx_csa_frame(sdata, mgmt, len);
break;
}
}
void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_rx_status *rx_status;
struct ieee80211_mgmt *mgmt;
u16 stype;
sdata_lock(sdata);
/* mesh already went down */
if (!sdata->wdev.mesh_id_len)
goto out;
rx_status = IEEE80211_SKB_RXCB(skb);
mgmt = (struct ieee80211_mgmt *) skb->data;
stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
switch (stype) {
case IEEE80211_STYPE_PROBE_RESP:
case IEEE80211_STYPE_BEACON:
ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
rx_status);
break;
case IEEE80211_STYPE_PROBE_REQ:
ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
break;
case IEEE80211_STYPE_ACTION:
ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
break;
}
out:
sdata_unlock(sdata);
}
static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u32 bit, changed = 0;
for_each_set_bit(bit, &ifmsh->mbss_changed,
sizeof(changed) * BITS_PER_BYTE) {
clear_bit(bit, &ifmsh->mbss_changed);
changed |= BIT(bit);
}
if (sdata->vif.bss_conf.enable_beacon &&
(changed & (BSS_CHANGED_BEACON |
BSS_CHANGED_HT |
BSS_CHANGED_BASIC_RATES |
BSS_CHANGED_BEACON_INT)))
if (ieee80211_mesh_rebuild_beacon(sdata))
return;
ieee80211_bss_info_change_notify(sdata, changed);
}
void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
sdata_lock(sdata);
/* mesh already went down */
if (!sdata->wdev.mesh_id_len)
goto out;
if (ifmsh->preq_queue_len &&
time_after(jiffies,
ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
mesh_path_start_discovery(sdata);
if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
mesh_mpath_table_grow();
if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
mesh_mpp_table_grow();
if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
ieee80211_mesh_housekeeping(sdata);
if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
ieee80211_mesh_rootpath(sdata);
if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
mesh_sync_adjust_tbtt(sdata);
if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
mesh_bss_info_changed(sdata);
out:
sdata_unlock(sdata);
}
void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list)
if (ieee80211_vif_is_mesh(&sdata->vif) &&
ieee80211_sdata_running(sdata))
ieee80211_queue_work(&local->hw, &sdata->work);
rcu_read_unlock();
}
void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
static u8 zero_addr[ETH_ALEN] = {};
setup_timer(&ifmsh->housekeeping_timer,
ieee80211_mesh_housekeeping_timer,
(unsigned long) sdata);
ifmsh->accepting_plinks = true;
atomic_set(&ifmsh->mpaths, 0);
mesh_rmc_init(sdata);
ifmsh->last_preq = jiffies;
ifmsh->next_perr = jiffies;
ifmsh->chsw_init = false;
/* Allocate all mesh structures when creating the first mesh interface. */
if (!mesh_allocated)
ieee80211s_init();
setup_timer(&ifmsh->mesh_path_timer,
ieee80211_mesh_path_timer,
(unsigned long) sdata);
setup_timer(&ifmsh->mesh_path_root_timer,
ieee80211_mesh_path_root_timer,
(unsigned long) sdata);
INIT_LIST_HEAD(&ifmsh->preq_queue.list);
skb_queue_head_init(&ifmsh->ps.bc_buf);
spin_lock_init(&ifmsh->mesh_preq_queue_lock);
spin_lock_init(&ifmsh->sync_offset_lock);
RCU_INIT_POINTER(ifmsh->beacon, NULL);
sdata->vif.bss_conf.bssid = zero_addr;
}
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