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Release 4.8 net/mac80211/mesh_plink.c

Directory: net/mac80211
/*
 * Copyright (c) 2008, 2009 open80211s Ltd.
 * Author:     Luis Carlos Cobo <luisca@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/gfp.h>
#include <linux/kernel.h>
#include <linux/random.h>
#include "ieee80211_i.h"
#include "rate.h"
#include "mesh.h"


#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2)

#define PLINK_GET_LLID(p) (p + 2)

#define PLINK_GET_PLID(p) (p + 4)


#define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \
                                jiffies + msecs_to_jiffies(t)))


enum plink_event {
	
PLINK_UNDEFINED,
	
OPN_ACPT,
	
OPN_RJCT,
	
OPN_IGNR,
	
CNF_ACPT,
	
CNF_RJCT,
	
CNF_IGNR,
	
CLS_ACPT,
	
CLS_IGNR
};


static const char * const mplstates[] = {
	[NL80211_PLINK_LISTEN] = "LISTEN",
	[NL80211_PLINK_OPN_SNT] = "OPN-SNT",
	[NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
	[NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
	[NL80211_PLINK_ESTAB] = "ESTAB",
	[NL80211_PLINK_HOLDING] = "HOLDING",
	[NL80211_PLINK_BLOCKED] = "BLOCKED"
};


static const char * const mplevents[] = {
	[PLINK_UNDEFINED] = "NONE",
	[OPN_ACPT] = "OPN_ACPT",
	[OPN_RJCT] = "OPN_RJCT",
	[OPN_IGNR] = "OPN_IGNR",
	[CNF_ACPT] = "CNF_ACPT",
	[CNF_RJCT] = "CNF_RJCT",
	[CNF_IGNR] = "CNF_IGNR",
	[CLS_ACPT] = "CLS_ACPT",
	[CLS_IGNR] = "CLS_IGNR"
};

/* We only need a valid sta if user configured a minimum rssi_threshold. */

static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata, struct sta_info *sta) { s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold; return rssi_threshold == 0 || (sta && (s8)-ewma_signal_read(&sta->rx_stats_avg.signal) > rssi_threshold); }

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bob copelandbob copeland5092.59%125.00%
johannes bergjohannes berg47.41%375.00%
Total54100.00%4100.00%

/** * mesh_plink_fsm_restart - restart a mesh peer link finite state machine * * @sta: mesh peer link to restart * * Locking: this function must be called holding sta->mesh->plink_lock */
static inline void mesh_plink_fsm_restart(struct sta_info *sta) { lockdep_assert_held(&sta->mesh->plink_lock); sta->mesh->plink_state = NL80211_PLINK_LISTEN; sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0; sta->mesh->plink_retries = 0; }

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luis carlos cobo rusluis carlos cobo rus3763.79%240.00%
johannes bergjohannes berg1220.69%120.00%
bob copelandbob copeland813.79%120.00%
javier cardonajavier cardona11.72%120.00%
Total58100.00%5100.00%

/* * mesh_set_short_slot_time - enable / disable ERP short slot time. * * The standard indirectly mandates mesh STAs to turn off short slot time by * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we * can't be sneaky about it. Enable short slot time if all mesh STAs in the * MBSS support ERP rates. * * Returns BSS_CHANGED_ERP_SLOT or 0 for no change. */
static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; enum nl80211_band band = ieee80211_get_sdata_band(sdata); struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; struct sta_info *sta; u32 erp_rates = 0, changed = 0; int i; bool short_slot = false; if (band == NL80211_BAND_5GHZ) { /* (IEEE 802.11-2012 19.4.5) */ short_slot = true; goto out; } else if (band != NL80211_BAND_2GHZ) goto out; for (i = 0; i < sband->n_bitrates; i++) if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G) erp_rates |= BIT(i); if (!erp_rates) goto out; rcu_read_lock(); list_for_each_entry_rcu(sta, &local->sta_list, list) { if (sdata != sta->sdata || sta->mesh->plink_state != NL80211_PLINK_ESTAB) continue; short_slot = false; if (erp_rates & sta->sta.supp_rates[band]) short_slot = true; else break; } rcu_read_unlock(); out: if (sdata->vif.bss_conf.use_short_slot != short_slot) { sdata->vif.bss_conf.use_short_slot = short_slot; changed = BSS_CHANGED_ERP_SLOT; mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n", sdata->vif.addr, short_slot); } return changed; }

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thomas pedersenthomas pedersen23597.92%133.33%
johannes bergjohannes berg52.08%266.67%
Total240100.00%3100.00%

/** * mesh_set_ht_prot_mode - set correct HT protection mode * * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode * is selected if all peers in our 20/40MHz MBSS support HT and atleast one * HT20 peer is present. Otherwise no-protection mode is selected. */
static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; struct sta_info *sta; u16 ht_opmode; bool non_ht_sta = false, ht20_sta = false; switch (sdata->vif.bss_conf.chandef.width) { case NL80211_CHAN_WIDTH_20_NOHT: case NL80211_CHAN_WIDTH_5: case NL80211_CHAN_WIDTH_10: return 0; default: break; } rcu_read_lock(); list_for_each_entry_rcu(sta, &local->sta_list, list) { if (sdata != sta->sdata || sta->mesh->plink_state != NL80211_PLINK_ESTAB) continue; if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20) continue; if (!sta->sta.ht_cap.ht_supported) { mpl_dbg(sdata, "nonHT sta (%pM) is present\n", sta->sta.addr); non_ht_sta = true; break; } mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr); ht20_sta = true; } rcu_read_unlock(); if (non_ht_sta) ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; else if (ht20_sta && sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20) ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; else ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode) return 0; sdata->vif.bss_conf.ht_operation_mode = ht_opmode; sdata->u.mesh.mshcfg.ht_opmode = ht_opmode; mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode); return BSS_CHANGED_HT; }

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ashok nagarajanashok nagarajan17372.08%333.33%
thomas pedersenthomas pedersen2811.67%111.11%
johannes bergjohannes berg2510.42%444.44%
simon wunderlichsimon wunderlich145.83%111.11%
Total240100.00%9100.00%


static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, enum ieee80211_self_protected_actioncode action, u8 *da, u16 llid, u16 plid, u16 reason) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_tx_info *info; struct ieee80211_mgmt *mgmt; bool include_plid = false; u16 peering_proto = 0; u8 *pos, ie_len = 4; int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + sizeof(mgmt->u.action.u.self_prot); int err = -ENOMEM; skb = dev_alloc_skb(local->tx_headroom + hdr_len + 2 + /* capability info */ 2 + /* AID */ 2 + 8 + /* supported rates */ 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 2 + sdata->u.mesh.mesh_id_len + 2 + sizeof(struct ieee80211_meshconf_ie) + 2 + sizeof(struct ieee80211_ht_cap) + 2 + sizeof(struct ieee80211_ht_operation) + 2 + sizeof(struct ieee80211_vht_cap) + 2 + sizeof(struct ieee80211_vht_operation) + 2 + 8 + /* peering IE */ sdata->u.mesh.ie_len); if (!skb) return err; info = IEEE80211_SKB_CB(skb); skb_reserve(skb, local->tx_headroom); 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_ACTION); memcpy(mgmt->da, da, ETH_ALEN); memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; mgmt->u.action.u.self_prot.action_code = action; if (action != WLAN_SP_MESH_PEERING_CLOSE) { enum nl80211_band band = ieee80211_get_sdata_band(sdata); /* capability info */ pos = skb_put(skb, 2); memset(pos, 0, 2); if (action == WLAN_SP_MESH_PEERING_CONFIRM) { /* AID */ pos = skb_put(skb, 2); put_unaligned_le16(sta->sta.aid, pos); } if (ieee80211_add_srates_ie(sdata, skb, true, band) || ieee80211_add_ext_srates_ie(sdata, skb, true, band) || mesh_add_rsn_ie(sdata, skb) || mesh_add_meshid_ie(sdata, skb) || mesh_add_meshconf_ie(sdata, skb)) goto free; } else { /* WLAN_SP_MESH_PEERING_CLOSE */ info->flags |= IEEE80211_TX_CTL_NO_ACK; if (mesh_add_meshid_ie(sdata, skb)) goto free; } /* Add Mesh Peering Management element */ switch (action) { case WLAN_SP_MESH_PEERING_OPEN: break; case WLAN_SP_MESH_PEERING_CONFIRM: ie_len += 2; include_plid = true; break; case WLAN_SP_MESH_PEERING_CLOSE: if (plid) { ie_len += 2; include_plid = true; } ie_len += 2; /* reason code */ break; default: err = -EINVAL; goto free; } if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) goto free; pos = skb_put(skb, 2 + ie_len); *pos++ = WLAN_EID_PEER_MGMT; *pos++ = ie_len; memcpy(pos, &peering_proto, 2); pos += 2; put_unaligned_le16(llid, pos); pos += 2; if (include_plid) { put_unaligned_le16(plid, pos); pos += 2; } if (action == WLAN_SP_MESH_PEERING_CLOSE) { put_unaligned_le16(reason, pos); pos += 2; } if (action != WLAN_SP_MESH_PEERING_CLOSE) { if (mesh_add_ht_cap_ie(sdata, skb) || mesh_add_ht_oper_ie(sdata, skb) || mesh_add_vht_cap_ie(sdata, skb) || mesh_add_vht_oper_ie(sdata, skb)) goto free; } if (mesh_add_vendor_ies(sdata, skb)) goto free; ieee80211_tx_skb(sdata, skb); return 0; free: kfree_skb(skb); return err; }

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thomas pedersenthomas pedersen29943.27%725.93%
luis carlos cobo rusluis carlos cobo rus25637.05%13.70%
bob copelandbob copeland415.93%311.11%
johannes bergjohannes berg334.78%725.93%
javier cardonajavier cardona172.46%27.41%
rui paulorui paulo142.03%27.41%
chun-yeow yeohchun-yeow yeoh111.59%13.70%
jasper bryant-greenejasper bryant-greene81.16%13.70%
arik nemtsovarik nemtsov60.87%13.70%
ashok nagarajanashok nagarajan40.58%13.70%
harvey harrisonharvey harrison20.29%13.70%
Total691100.00%27100.00%

/** * __mesh_plink_deactivate - deactivate mesh peer link * * @sta: mesh peer link to deactivate * * Mesh paths with this peer as next hop should be flushed * by the caller outside of plink_lock. * * Returns beacon changed flag if the beacon content changed. * * Locking: the caller must hold sta->mesh->plink_lock */
static u32 __mesh_plink_deactivate(struct sta_info *sta) { struct ieee80211_sub_if_data *sdata = sta->sdata; u32 changed = 0; lockdep_assert_held(&sta->mesh->plink_lock); if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) changed = mesh_plink_dec_estab_count(sdata); sta->mesh->plink_state = NL80211_PLINK_BLOCKED; ieee80211_mps_sta_status_update(sta); changed |= ieee80211_mps_set_sta_local_pm(sta, NL80211_MESH_POWER_UNKNOWN); return changed; }

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PersonTokensPropCommitsCommitProp
bob copelandbob copeland77100.00%1100.00%
Total77100.00%1100.00%

/** * mesh_plink_deactivate - deactivate mesh peer link * * @sta: mesh peer link to deactivate * * All mesh paths with this peer as next hop will be flushed */
u32 mesh_plink_deactivate(struct sta_info *sta) { struct ieee80211_sub_if_data *sdata = sta->sdata; u32 changed; spin_lock_bh(&sta->mesh->plink_lock); changed = __mesh_plink_deactivate(sta); if (!sdata->u.mesh.user_mpm) { sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED; mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE, sta->sta.addr, sta->mesh->llid, sta->mesh->plid, sta->mesh->reason); } spin_unlock_bh(&sta->mesh->plink_lock); if (!sdata->u.mesh.user_mpm) del_timer_sync(&sta->mesh->plink_timer); mesh_path_flush_by_nexthop(sta); /* make sure no readers can access nexthop sta from here on */ synchronize_net(); return changed; }

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bob copelandbob copeland136100.00%4100.00%
Total136100.00%4100.00%


static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, struct ieee802_11_elems *elems, bool insert) { struct ieee80211_local *local = sdata->local; enum nl80211_band band = ieee80211_get_sdata_band(sdata); struct ieee80211_supported_band *sband; u32 rates, basic_rates = 0, changed = 0; enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; sband = local->hw.wiphy->bands[band]; rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates); spin_lock_bh(&sta->mesh->plink_lock); sta->rx_stats.last_rx = jiffies; /* rates and capabilities don't change during peering */ if (sta->mesh->plink_state == NL80211_PLINK_ESTAB && sta->mesh->processed_beacon) goto out; sta->mesh->processed_beacon = true; if (sta->sta.supp_rates[band] != rates) changed |= IEEE80211_RC_SUPP_RATES_CHANGED; sta->sta.supp_rates[band] = rates; if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, elems->ht_cap_elem, sta)) changed |= IEEE80211_RC_BW_CHANGED; ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, elems->vht_cap_elem, sta); if (bw != sta->sta.bandwidth) changed |= IEEE80211_RC_BW_CHANGED; /* HT peer is operating 20MHz-only */ if (elems->ht_operation && !(elems->ht_operation->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20) changed |= IEEE80211_RC_BW_CHANGED; sta->sta.bandwidth = IEEE80211_STA_RX_BW_20; } if (insert) rate_control_rate_init(sta); else rate_control_rate_update(local, sband, sta, changed); out: spin_unlock_bh(&sta->mesh->plink_lock); }

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thomas pedersenthomas pedersen18463.45%624.00%
johannes bergjohannes berg248.28%832.00%
janusz dziedzicjanusz dziedzic248.28%14.00%
bob copelandbob copeland155.17%28.00%
luis carlos cobo rusluis carlos cobo rus144.83%14.00%
alexis greenalexis green103.45%14.00%
chun-yeow yeohchun-yeow yeoh82.76%14.00%
helmut schaahelmut schaa41.38%14.00%
javier cardonajavier cardona31.03%14.00%
jasper bryant-greenejasper bryant-greene20.69%14.00%
simon wunderlichsimon wunderlich10.34%14.00%
ashok nagarajanashok nagarajan10.34%14.00%
Total290100.00%25100.00%


static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata) { struct sta_info *sta; unsigned long *aid_map; int aid; aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1), sizeof(*aid_map), GFP_KERNEL); if (!aid_map) return -ENOMEM; /* reserve aid 0 for mcast indication */ __set_bit(0, aid_map); rcu_read_lock(); list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) __set_bit(sta->sta.aid, aid_map); rcu_read_unlock(); aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1); kfree(aid_map); if (aid > IEEE80211_MAX_AID) return -ENOBUFS; return aid; }

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bob copelandbob copeland115100.00%1100.00%
Total115100.00%1100.00%


static struct sta_info * __mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr) { struct sta_info *sta; int aid; if (sdata->local->num_sta >= MESH_MAX_PLINKS) return NULL; aid = mesh_allocate_aid(sdata); if (aid < 0) return NULL; sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); if (!sta) return NULL; sta->mesh->plink_state = NL80211_PLINK_LISTEN; sta->sta.wme = true; sta->sta.aid = aid; sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); return sta; }

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thomas pedersenthomas pedersen8469.42%240.00%
bob copelandbob copeland2722.31%120.00%
johannes bergjohannes berg108.26%240.00%
Total121100.00%5100.00%


static struct sta_info * mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr, struct ieee802_11_elems *elems) { struct sta_info *sta = NULL; /* Userspace handles station allocation */ if (sdata->u.mesh.user_mpm || sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) cfg80211_notify_new_peer_candidate(sdata->dev, addr, elems->ie_start, elems->total_len, GFP_KERNEL); else sta = __mesh_sta_info_alloc(sdata, addr); return sta; }

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thomas pedersenthomas pedersen82100.00%3100.00%
Total82100.00%3100.00%

/* * mesh_sta_info_get - return mesh sta info entry for @addr. * * @sdata: local meshif * @addr: peer's address * @elems: IEs from beacon or mesh peering frame. * * Return existing or newly allocated sta_info under RCU read lock. * (re)initialize with given IEs. */
static struct sta_info * mesh_sta_info_get(struct ieee80211_sub_if_data *sdata, u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU) { struct sta_info *sta = NULL; rcu_read_lock(); sta = sta_info_get(sdata, addr); if (sta) { mesh_sta_info_init(sdata, sta, elems, false); } else { rcu_read_unlock(); /* can't run atomic */ sta = mesh_sta_info_alloc(sdata, addr, elems); if (!sta) { rcu_read_lock(); return NULL; } mesh_sta_info_init(sdata, sta, elems, true); if (sta_info_insert_rcu(sta)) return NULL; } return sta; }

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thomas pedersenthomas pedersen117100.00%4100.00%
Total117100.00%4100.00%

/* * mesh_neighbour_update - update or initialize new mesh neighbor. * * @sdata: local meshif * @addr: peer's address * @elems: IEs from beacon or mesh peering frame * * Initiates peering if appropriate. */
void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, u8 *hw_addr, struct ieee802_11_elems *elems) { struct sta_info *sta; u32 changed = 0; sta = mesh_sta_info_get(sdata, hw_addr, elems); if (!sta) goto out; if (mesh_peer_accepts_plinks(elems) && sta->mesh->plink_state == NL80211_PLINK_LISTEN && sdata->u.mesh.accepting_plinks && sdata->u.mesh.mshcfg.auto_open_plinks && rssi_threshold_check(sdata, sta)) changed = mesh_plink_open(sta); ieee80211_mps_frame_release(sta, elems); out: rcu_read_unlock(); ieee80211_mbss_info_change_notify(sdata, changed); }

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PersonTokensPropCommitsCommitProp
thomas pedersenthomas pedersen4438.60%635.29%
luis carlos cobo rusluis carlos cobo rus4035.09%15.88%
johannes bergjohannes berg119.65%423.53%
marco porschmarco porsch76.14%15.88%
javier cardonajavier cardona54.39%211.76%
ashok nagarajanashok nagarajan54.39%211.76%
bob copelandbob copeland21.75%15.88%
Total114100.00%17100.00%


static void mesh_plink_timer(unsigned long data) { struct sta_info *sta; u16 reason = 0; struct ieee80211_sub_if_data *sdata; struct mesh_config *mshcfg; enum ieee80211_self_protected_actioncode action = 0; /* * This STA is valid because sta_info_destroy() will * del_timer_sync() this timer after having made sure * it cannot be readded (by deleting the plink.) */ sta = (struct sta_info *) data; if (sta->sdata->local->quiescing) return; spin_lock_bh(&sta->mesh->plink_lock); /* If a timer fires just before a state transition on another CPU, * we may have already extended the timeout and changed state by the * time we've acquired the lock and arrived here. In that case, * skip this timer and wait for the new one. */ if (time_before(jiffies, sta->mesh->plink_timer.expires)) { mpl_dbg(sta->sdata, "Ignoring timer for %pM in state %s (timer adjusted)", sta->sta.addr, mplstates[sta->mesh->plink_state]); spin_unlock_bh(&sta->mesh->plink_lock); return; } /* del_timer() and handler may race when entering these states */ if (sta->mesh->plink_state == NL80211_PLINK_LISTEN || sta->mesh->plink_state == NL80211_PLINK_ESTAB) { mpl_dbg(sta->sdata, "Ignoring timer for %pM in state %s (timer deleted)", sta->sta.addr, mplstates[sta->mesh->plink_state]); spin_unlock_bh(&sta->mesh->plink_lock); return; } mpl_dbg(sta->sdata, "Mesh plink timer for %pM fired on state %s\n", sta->sta.addr, mplstates[sta->mesh->plink_state]); sdata = sta->sdata; mshcfg = &sdata->u.mesh.mshcfg; switch (sta->mesh->plink_state) { case NL80211_PLINK_OPN_RCVD: case NL80211_PLINK_OPN_SNT: /* retry timer */ if (sta->mesh->plink_retries < mshcfg->dot11MeshMaxRetries) { u32 rand; mpl_dbg(sta->sdata, "Mesh plink for %pM (retry, timeout): %d %d\n", sta->sta.addr, sta->mesh->plink_retries, sta->mesh->plink_timeout); get_random_bytes(&rand, sizeof(u32)); sta->mesh->plink_timeout = sta->mesh->plink_timeout + rand % sta->mesh->plink_timeout; ++sta->mesh->plink_retries; mod_plink_timer(sta, sta->mesh->plink_timeout); action = WLAN_SP_MESH_PEERING_OPEN; break; } reason = WLAN_REASON_MESH_MAX_RETRIES; /* fall through on else */ case NL80211_PLINK_CNF_RCVD: /* confirm timer */ if (!reason) reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT; sta->mesh->plink_state = NL80211_PLINK_HOLDING; mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); action = WLAN_SP_MESH_PEERING_CLOSE; break; case NL80211_PLINK_HOLDING: /* holding timer */ del_timer(&sta->mesh->plink_timer); mesh_plink_fsm_restart(sta