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32 KiB
1234 lines
32 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2008, 2009 open80211s Ltd. |
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* Copyright (C) 2019 Intel Corporation |
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* Author: Luis Carlos Cobo <[email protected]> |
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*/ |
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#include <linux/gfp.h> |
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#include <linux/kernel.h> |
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#include <linux/random.h> |
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#include <linux/rculist.h> |
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|
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#include "ieee80211_i.h" |
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#include "rate.h" |
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#include "mesh.h" |
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|
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#define PLINK_CNF_AID(mgmt) ((mgmt)->u.action.u.self_prot.variable + 2) |
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#define PLINK_GET_LLID(p) (p + 2) |
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#define PLINK_GET_PLID(p) (p + 4) |
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|
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#define mod_plink_timer(s, t) (mod_timer(&s->mesh->plink_timer, \ |
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jiffies + msecs_to_jiffies(t))) |
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enum plink_event { |
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PLINK_UNDEFINED, |
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OPN_ACPT, |
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OPN_RJCT, |
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OPN_IGNR, |
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CNF_ACPT, |
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CNF_RJCT, |
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CNF_IGNR, |
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CLS_ACPT, |
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CLS_IGNR |
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}; |
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|
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static const char * const mplstates[] = { |
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[NL80211_PLINK_LISTEN] = "LISTEN", |
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[NL80211_PLINK_OPN_SNT] = "OPN-SNT", |
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[NL80211_PLINK_OPN_RCVD] = "OPN-RCVD", |
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[NL80211_PLINK_CNF_RCVD] = "CNF_RCVD", |
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[NL80211_PLINK_ESTAB] = "ESTAB", |
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[NL80211_PLINK_HOLDING] = "HOLDING", |
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[NL80211_PLINK_BLOCKED] = "BLOCKED" |
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}; |
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|
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static const char * const mplevents[] = { |
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[PLINK_UNDEFINED] = "NONE", |
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[OPN_ACPT] = "OPN_ACPT", |
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[OPN_RJCT] = "OPN_RJCT", |
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[OPN_IGNR] = "OPN_IGNR", |
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[CNF_ACPT] = "CNF_ACPT", |
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[CNF_RJCT] = "CNF_RJCT", |
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[CNF_IGNR] = "CNF_IGNR", |
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[CLS_ACPT] = "CLS_ACPT", |
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[CLS_IGNR] = "CLS_IGNR" |
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}; |
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|
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/* We only need a valid sta if user configured a minimum rssi_threshold. */ |
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static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata, |
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struct sta_info *sta) |
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{ |
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s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold; |
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return rssi_threshold == 0 || |
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(sta && |
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(s8)-ewma_signal_read(&sta->rx_stats_avg.signal) > |
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rssi_threshold); |
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} |
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|
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/** |
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* mesh_plink_fsm_restart - restart a mesh peer link finite state machine |
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* |
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* @sta: mesh peer link to restart |
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* |
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* Locking: this function must be called holding sta->mesh->plink_lock |
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*/ |
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static inline void mesh_plink_fsm_restart(struct sta_info *sta) |
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{ |
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lockdep_assert_held(&sta->mesh->plink_lock); |
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sta->mesh->plink_state = NL80211_PLINK_LISTEN; |
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sta->mesh->llid = sta->mesh->plid = sta->mesh->reason = 0; |
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sta->mesh->plink_retries = 0; |
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} |
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|
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/* |
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* mesh_set_short_slot_time - enable / disable ERP short slot time. |
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* |
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* The standard indirectly mandates mesh STAs to turn off short slot time by |
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* disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we |
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* can't be sneaky about it. Enable short slot time if all mesh STAs in the |
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* MBSS support ERP rates. |
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* |
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* Returns BSS_CHANGED_ERP_SLOT or 0 for no change. |
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*/ |
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static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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struct ieee80211_supported_band *sband; |
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struct sta_info *sta; |
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u32 erp_rates = 0, changed = 0; |
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int i; |
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bool short_slot = false; |
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|
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sband = ieee80211_get_sband(sdata); |
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if (!sband) |
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return changed; |
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if (sband->band == NL80211_BAND_5GHZ) { |
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/* (IEEE 802.11-2012 19.4.5) */ |
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short_slot = true; |
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goto out; |
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} else if (sband->band != NL80211_BAND_2GHZ) { |
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goto out; |
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} |
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for (i = 0; i < sband->n_bitrates; i++) |
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if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G) |
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erp_rates |= BIT(i); |
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|
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if (!erp_rates) |
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goto out; |
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rcu_read_lock(); |
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list_for_each_entry_rcu(sta, &local->sta_list, list) { |
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if (sdata != sta->sdata || |
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sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
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continue; |
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short_slot = false; |
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if (erp_rates & sta->sta.supp_rates[sband->band]) |
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short_slot = true; |
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else |
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break; |
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} |
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rcu_read_unlock(); |
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out: |
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if (sdata->vif.bss_conf.use_short_slot != short_slot) { |
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sdata->vif.bss_conf.use_short_slot = short_slot; |
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changed = BSS_CHANGED_ERP_SLOT; |
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mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n", |
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sdata->vif.addr, short_slot); |
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} |
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return changed; |
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} |
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|
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/** |
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* mesh_set_ht_prot_mode - set correct HT protection mode |
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* @sdata: the (mesh) interface to handle |
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* |
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* Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT |
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* mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT |
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* mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is |
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* selected if any non-HT peers are present in our MBSS. 20MHz-protection mode |
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* is selected if all peers in our 20/40MHz MBSS support HT and at least one |
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* HT20 peer is present. Otherwise no-protection mode is selected. |
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*/ |
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static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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struct sta_info *sta; |
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u16 ht_opmode; |
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bool non_ht_sta = false, ht20_sta = false; |
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|
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switch (sdata->vif.bss_conf.chandef.width) { |
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case NL80211_CHAN_WIDTH_20_NOHT: |
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case NL80211_CHAN_WIDTH_5: |
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case NL80211_CHAN_WIDTH_10: |
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return 0; |
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default: |
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break; |
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} |
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|
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rcu_read_lock(); |
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list_for_each_entry_rcu(sta, &local->sta_list, list) { |
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if (sdata != sta->sdata || |
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sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
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continue; |
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|
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if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20) |
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continue; |
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if (!sta->sta.ht_cap.ht_supported) { |
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mpl_dbg(sdata, "nonHT sta (%pM) is present\n", |
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sta->sta.addr); |
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non_ht_sta = true; |
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break; |
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} |
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|
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mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr); |
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ht20_sta = true; |
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} |
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rcu_read_unlock(); |
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|
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if (non_ht_sta) |
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ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; |
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else if (ht20_sta && |
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sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20) |
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ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; |
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else |
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ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; |
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if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode) |
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return 0; |
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sdata->vif.bss_conf.ht_operation_mode = ht_opmode; |
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sdata->u.mesh.mshcfg.ht_opmode = ht_opmode; |
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mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode); |
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return BSS_CHANGED_HT; |
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} |
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static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata, |
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struct sta_info *sta, |
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enum ieee80211_self_protected_actioncode action, |
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u8 *da, u16 llid, u16 plid, u16 reason) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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struct sk_buff *skb; |
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struct ieee80211_tx_info *info; |
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struct ieee80211_mgmt *mgmt; |
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bool include_plid = false; |
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u16 peering_proto = 0; |
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u8 *pos, ie_len = 4; |
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u8 ie_len_he_cap; |
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int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot); |
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int err = -ENOMEM; |
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ie_len_he_cap = ieee80211_ie_len_he_cap(sdata, |
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NL80211_IFTYPE_MESH_POINT); |
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skb = dev_alloc_skb(local->tx_headroom + |
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hdr_len + |
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2 + /* capability info */ |
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2 + /* AID */ |
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2 + 8 + /* supported rates */ |
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2 + (IEEE80211_MAX_SUPP_RATES - 8) + |
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2 + sdata->u.mesh.mesh_id_len + |
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2 + sizeof(struct ieee80211_meshconf_ie) + |
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2 + sizeof(struct ieee80211_ht_cap) + |
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2 + sizeof(struct ieee80211_ht_operation) + |
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2 + sizeof(struct ieee80211_vht_cap) + |
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2 + sizeof(struct ieee80211_vht_operation) + |
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ie_len_he_cap + |
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2 + 1 + sizeof(struct ieee80211_he_operation) + |
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sizeof(struct ieee80211_he_6ghz_oper) + |
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2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) + |
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2 + 8 + /* peering IE */ |
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sdata->u.mesh.ie_len); |
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if (!skb) |
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return err; |
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info = IEEE80211_SKB_CB(skb); |
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skb_reserve(skb, local->tx_headroom); |
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mgmt = skb_put_zero(skb, hdr_len); |
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mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
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IEEE80211_STYPE_ACTION); |
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memcpy(mgmt->da, da, ETH_ALEN); |
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memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
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memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
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mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; |
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mgmt->u.action.u.self_prot.action_code = action; |
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if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
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struct ieee80211_supported_band *sband; |
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enum nl80211_band band; |
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sband = ieee80211_get_sband(sdata); |
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if (!sband) { |
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err = -EINVAL; |
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goto free; |
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} |
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band = sband->band; |
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|
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/* capability info */ |
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pos = skb_put_zero(skb, 2); |
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if (action == WLAN_SP_MESH_PEERING_CONFIRM) { |
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/* AID */ |
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pos = skb_put(skb, 2); |
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put_unaligned_le16(sta->sta.aid, pos); |
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} |
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if (ieee80211_add_srates_ie(sdata, skb, true, band) || |
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ieee80211_add_ext_srates_ie(sdata, skb, true, band) || |
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mesh_add_rsn_ie(sdata, skb) || |
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mesh_add_meshid_ie(sdata, skb) || |
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mesh_add_meshconf_ie(sdata, skb)) |
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goto free; |
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} else { /* WLAN_SP_MESH_PEERING_CLOSE */ |
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info->flags |= IEEE80211_TX_CTL_NO_ACK; |
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if (mesh_add_meshid_ie(sdata, skb)) |
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goto free; |
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} |
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|
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/* Add Mesh Peering Management element */ |
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switch (action) { |
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case WLAN_SP_MESH_PEERING_OPEN: |
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break; |
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case WLAN_SP_MESH_PEERING_CONFIRM: |
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ie_len += 2; |
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include_plid = true; |
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break; |
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case WLAN_SP_MESH_PEERING_CLOSE: |
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if (plid) { |
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ie_len += 2; |
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include_plid = true; |
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} |
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ie_len += 2; /* reason code */ |
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break; |
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default: |
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err = -EINVAL; |
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goto free; |
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} |
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|
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if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) |
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goto free; |
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pos = skb_put(skb, 2 + ie_len); |
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*pos++ = WLAN_EID_PEER_MGMT; |
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*pos++ = ie_len; |
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memcpy(pos, &peering_proto, 2); |
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pos += 2; |
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put_unaligned_le16(llid, pos); |
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pos += 2; |
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if (include_plid) { |
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put_unaligned_le16(plid, pos); |
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pos += 2; |
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} |
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if (action == WLAN_SP_MESH_PEERING_CLOSE) { |
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put_unaligned_le16(reason, pos); |
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pos += 2; |
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} |
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|
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if (action != WLAN_SP_MESH_PEERING_CLOSE) { |
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if (mesh_add_ht_cap_ie(sdata, skb) || |
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mesh_add_ht_oper_ie(sdata, skb) || |
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mesh_add_vht_cap_ie(sdata, skb) || |
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mesh_add_vht_oper_ie(sdata, skb) || |
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mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) || |
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mesh_add_he_oper_ie(sdata, skb) || |
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mesh_add_he_6ghz_cap_ie(sdata, skb)) |
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goto free; |
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} |
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|
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if (mesh_add_vendor_ies(sdata, skb)) |
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goto free; |
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|
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ieee80211_tx_skb(sdata, skb); |
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return 0; |
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free: |
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kfree_skb(skb); |
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return err; |
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} |
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|
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/** |
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* __mesh_plink_deactivate - deactivate mesh peer link |
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* |
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* @sta: mesh peer link to deactivate |
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* |
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* Mesh paths with this peer as next hop should be flushed |
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* by the caller outside of plink_lock. |
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* |
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* Returns beacon changed flag if the beacon content changed. |
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* |
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* Locking: the caller must hold sta->mesh->plink_lock |
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*/ |
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static u32 __mesh_plink_deactivate(struct sta_info *sta) |
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{ |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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u32 changed = 0; |
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lockdep_assert_held(&sta->mesh->plink_lock); |
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if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) |
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changed = mesh_plink_dec_estab_count(sdata); |
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sta->mesh->plink_state = NL80211_PLINK_BLOCKED; |
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ieee80211_mps_sta_status_update(sta); |
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changed |= ieee80211_mps_set_sta_local_pm(sta, |
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NL80211_MESH_POWER_UNKNOWN); |
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return changed; |
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} |
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|
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/** |
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* mesh_plink_deactivate - deactivate mesh peer link |
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* |
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* @sta: mesh peer link to deactivate |
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* |
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* All mesh paths with this peer as next hop will be flushed |
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*/ |
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u32 mesh_plink_deactivate(struct sta_info *sta) |
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{ |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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u32 changed; |
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|
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spin_lock_bh(&sta->mesh->plink_lock); |
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changed = __mesh_plink_deactivate(sta); |
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|
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if (!sdata->u.mesh.user_mpm) { |
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sta->mesh->reason = WLAN_REASON_MESH_PEER_CANCELED; |
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mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_CLOSE, |
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sta->sta.addr, sta->mesh->llid, |
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sta->mesh->plid, sta->mesh->reason); |
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} |
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spin_unlock_bh(&sta->mesh->plink_lock); |
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if (!sdata->u.mesh.user_mpm) |
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del_timer_sync(&sta->mesh->plink_timer); |
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mesh_path_flush_by_nexthop(sta); |
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|
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/* make sure no readers can access nexthop sta from here on */ |
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synchronize_net(); |
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|
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return changed; |
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} |
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|
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static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata, |
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struct sta_info *sta, |
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struct ieee802_11_elems *elems) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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struct ieee80211_supported_band *sband; |
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u32 rates, basic_rates = 0, changed = 0; |
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enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth; |
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|
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sband = ieee80211_get_sband(sdata); |
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if (!sband) |
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return; |
|
|
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rates = ieee80211_sta_get_rates(sdata, elems, sband->band, |
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&basic_rates); |
|
|
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spin_lock_bh(&sta->mesh->plink_lock); |
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sta->rx_stats.last_rx = jiffies; |
|
|
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/* rates and capabilities don't change during peering */ |
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if (sta->mesh->plink_state == NL80211_PLINK_ESTAB && |
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sta->mesh->processed_beacon) |
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goto out; |
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sta->mesh->processed_beacon = true; |
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|
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if (sta->sta.supp_rates[sband->band] != rates) |
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changed |= IEEE80211_RC_SUPP_RATES_CHANGED; |
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sta->sta.supp_rates[sband->band] = rates; |
|
|
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if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, |
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elems->ht_cap_elem, sta)) |
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changed |= IEEE80211_RC_BW_CHANGED; |
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|
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ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, |
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elems->vht_cap_elem, sta); |
|
|
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ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband, elems->he_cap, |
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elems->he_cap_len, |
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elems->he_6ghz_capa, |
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sta); |
|
|
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if (bw != sta->sta.bandwidth) |
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changed |= IEEE80211_RC_BW_CHANGED; |
|
|
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/* HT peer is operating 20MHz-only */ |
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if (elems->ht_operation && |
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!(elems->ht_operation->ht_param & |
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IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { |
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if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20) |
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changed |= IEEE80211_RC_BW_CHANGED; |
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sta->sta.bandwidth = IEEE80211_STA_RX_BW_20; |
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} |
|
|
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if (!test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) |
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rate_control_rate_init(sta); |
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else |
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rate_control_rate_update(local, sband, sta, changed); |
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out: |
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spin_unlock_bh(&sta->mesh->plink_lock); |
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} |
|
|
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static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata) |
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{ |
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struct sta_info *sta; |
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unsigned long *aid_map; |
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int aid; |
|
|
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aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1), |
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sizeof(*aid_map), GFP_KERNEL); |
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if (!aid_map) |
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return -ENOMEM; |
|
|
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/* reserve aid 0 for mcast indication */ |
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__set_bit(0, aid_map); |
|
|
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rcu_read_lock(); |
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list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) |
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__set_bit(sta->sta.aid, aid_map); |
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rcu_read_unlock(); |
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|
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aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1); |
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kfree(aid_map); |
|
|
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if (aid > IEEE80211_MAX_AID) |
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return -ENOBUFS; |
|
|
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return aid; |
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} |
|
|
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static struct sta_info * |
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__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr) |
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{ |
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struct sta_info *sta; |
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int aid; |
|
|
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if (sdata->local->num_sta >= MESH_MAX_PLINKS) |
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return NULL; |
|
|
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aid = mesh_allocate_aid(sdata); |
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if (aid < 0) |
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return NULL; |
|
|
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sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL); |
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if (!sta) |
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return NULL; |
|
|
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sta->mesh->plink_state = NL80211_PLINK_LISTEN; |
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sta->sta.wme = true; |
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sta->sta.aid = aid; |
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|
|
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; |
|
} |
|
|
|
static struct sta_info * |
|
mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr, |
|
struct ieee802_11_elems *elems, |
|
struct ieee80211_rx_status *rx_status) |
|
{ |
|
struct sta_info *sta = NULL; |
|
|
|
/* Userspace handles station allocation */ |
|
if (sdata->u.mesh.user_mpm || |
|
sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) { |
|
if (mesh_peer_accepts_plinks(elems) && |
|
mesh_plink_availables(sdata)) { |
|
int sig = 0; |
|
|
|
if (ieee80211_hw_check(&sdata->local->hw, SIGNAL_DBM)) |
|
sig = rx_status->signal; |
|
|
|
cfg80211_notify_new_peer_candidate(sdata->dev, addr, |
|
elems->ie_start, |
|
elems->total_len, |
|
sig, GFP_KERNEL); |
|
} |
|
} else |
|
sta = __mesh_sta_info_alloc(sdata, addr); |
|
|
|
return sta; |
|
} |
|
|
|
/* |
|
* 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. |
|
* @rx_status: rx status for the frame for signal reporting |
|
* |
|
* 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, |
|
struct ieee80211_rx_status *rx_status) __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); |
|
} else { |
|
rcu_read_unlock(); |
|
/* can't run atomic */ |
|
sta = mesh_sta_info_alloc(sdata, addr, elems, rx_status); |
|
if (!sta) { |
|
rcu_read_lock(); |
|
return NULL; |
|
} |
|
|
|
mesh_sta_info_init(sdata, sta, elems); |
|
|
|
if (sta_info_insert_rcu(sta)) |
|
return NULL; |
|
} |
|
|
|
return sta; |
|
} |
|
|
|
/* |
|
* mesh_neighbour_update - update or initialize new mesh neighbor. |
|
* |
|
* @sdata: local meshif |
|
* @addr: peer's address |
|
* @elems: IEs from beacon or mesh peering frame |
|
* @rx_status: rx status for the frame for signal reporting |
|
* |
|
* Initiates peering if appropriate. |
|
*/ |
|
void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, |
|
u8 *hw_addr, |
|
struct ieee802_11_elems *elems, |
|
struct ieee80211_rx_status *rx_status) |
|
{ |
|
struct sta_info *sta; |
|
u32 changed = 0; |
|
|
|
sta = mesh_sta_info_get(sdata, hw_addr, elems, rx_status); |
|
if (!sta) |
|
goto out; |
|
|
|
sta->mesh->connected_to_gate = elems->mesh_config->meshconf_form & |
|
IEEE80211_MESHCONF_FORM_CONNECTED_TO_GATE; |
|
|
|
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); |
|
} |
|
|
|
void mesh_plink_timer(struct timer_list *t) |
|
{ |
|
struct mesh_sta *mesh = from_timer(mesh, t, plink_timer); |
|
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 = mesh->plink_sta; |
|
|
|
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; |
|
fallthrough; |
|
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); |
|
break; |
|
default: |
|
break; |
|
} |
|
spin_unlock_bh(&sta->mesh->plink_lock); |
|
if (action) |
|
mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
|
sta->mesh->llid, sta->mesh->plid, reason); |
|
} |
|
|
|
static inline void mesh_plink_timer_set(struct sta_info *sta, u32 timeout) |
|
{ |
|
sta->mesh->plink_timeout = timeout; |
|
mod_timer(&sta->mesh->plink_timer, jiffies + msecs_to_jiffies(timeout)); |
|
} |
|
|
|
static bool llid_in_use(struct ieee80211_sub_if_data *sdata, |
|
u16 llid) |
|
{ |
|
struct ieee80211_local *local = sdata->local; |
|
bool in_use = false; |
|
struct sta_info *sta; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(sta, &local->sta_list, list) { |
|
if (sdata != sta->sdata) |
|
continue; |
|
|
|
if (!memcmp(&sta->mesh->llid, &llid, sizeof(llid))) { |
|
in_use = true; |
|
break; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
|
|
return in_use; |
|
} |
|
|
|
static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata) |
|
{ |
|
u16 llid; |
|
|
|
do { |
|
get_random_bytes(&llid, sizeof(llid)); |
|
} while (llid_in_use(sdata, llid)); |
|
|
|
return llid; |
|
} |
|
|
|
u32 mesh_plink_open(struct sta_info *sta) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = sta->sdata; |
|
u32 changed; |
|
|
|
if (!test_sta_flag(sta, WLAN_STA_AUTH)) |
|
return 0; |
|
|
|
spin_lock_bh(&sta->mesh->plink_lock); |
|
sta->mesh->llid = mesh_get_new_llid(sdata); |
|
if (sta->mesh->plink_state != NL80211_PLINK_LISTEN && |
|
sta->mesh->plink_state != NL80211_PLINK_BLOCKED) { |
|
spin_unlock_bh(&sta->mesh->plink_lock); |
|
return 0; |
|
} |
|
sta->mesh->plink_state = NL80211_PLINK_OPN_SNT; |
|
mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout); |
|
spin_unlock_bh(&sta->mesh->plink_lock); |
|
mpl_dbg(sdata, |
|
"Mesh plink: starting establishment with %pM\n", |
|
sta->sta.addr); |
|
|
|
/* set the non-peer mode to active during peering */ |
|
changed = ieee80211_mps_local_status_update(sdata); |
|
|
|
mesh_plink_frame_tx(sdata, sta, WLAN_SP_MESH_PEERING_OPEN, |
|
sta->sta.addr, sta->mesh->llid, 0, 0); |
|
return changed; |
|
} |
|
|
|
u32 mesh_plink_block(struct sta_info *sta) |
|
{ |
|
u32 changed; |
|
|
|
spin_lock_bh(&sta->mesh->plink_lock); |
|
changed = __mesh_plink_deactivate(sta); |
|
sta->mesh->plink_state = NL80211_PLINK_BLOCKED; |
|
spin_unlock_bh(&sta->mesh->plink_lock); |
|
mesh_path_flush_by_nexthop(sta); |
|
|
|
return changed; |
|
} |
|
|
|
static void mesh_plink_close(struct ieee80211_sub_if_data *sdata, |
|
struct sta_info *sta, |
|
enum plink_event event) |
|
{ |
|
struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; |
|
u16 reason = (event == CLS_ACPT) ? |
|
WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG; |
|
|
|
sta->mesh->reason = reason; |
|
sta->mesh->plink_state = NL80211_PLINK_HOLDING; |
|
mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout); |
|
} |
|
|
|
static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata, |
|
struct sta_info *sta) |
|
{ |
|
struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; |
|
u32 changed = 0; |
|
|
|
del_timer(&sta->mesh->plink_timer); |
|
sta->mesh->plink_state = NL80211_PLINK_ESTAB; |
|
changed |= mesh_plink_inc_estab_count(sdata); |
|
changed |= mesh_set_ht_prot_mode(sdata); |
|
changed |= mesh_set_short_slot_time(sdata); |
|
mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr); |
|
ieee80211_mps_sta_status_update(sta); |
|
changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode); |
|
return changed; |
|
} |
|
|
|
/** |
|
* mesh_plink_fsm - step @sta MPM based on @event |
|
* |
|
* @sdata: interface |
|
* @sta: mesh neighbor |
|
* @event: peering event |
|
* |
|
* Return: changed MBSS flags |
|
*/ |
|
static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata, |
|
struct sta_info *sta, enum plink_event event) |
|
{ |
|
struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg; |
|
enum ieee80211_self_protected_actioncode action = 0; |
|
u32 changed = 0; |
|
bool flush = false; |
|
|
|
mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr, |
|
mplstates[sta->mesh->plink_state], mplevents[event]); |
|
|
|
spin_lock_bh(&sta->mesh->plink_lock); |
|
switch (sta->mesh->plink_state) { |
|
case NL80211_PLINK_LISTEN: |
|
switch (event) { |
|
case CLS_ACPT: |
|
mesh_plink_fsm_restart(sta); |
|
break; |
|
case OPN_ACPT: |
|
sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
|
sta->mesh->llid = mesh_get_new_llid(sdata); |
|
mesh_plink_timer_set(sta, |
|
mshcfg->dot11MeshRetryTimeout); |
|
|
|
/* set the non-peer mode to active during peering */ |
|
changed |= ieee80211_mps_local_status_update(sdata); |
|
action = WLAN_SP_MESH_PEERING_OPEN; |
|
break; |
|
default: |
|
break; |
|
} |
|
break; |
|
case NL80211_PLINK_OPN_SNT: |
|
switch (event) { |
|
case OPN_RJCT: |
|
case CNF_RJCT: |
|
case CLS_ACPT: |
|
mesh_plink_close(sdata, sta, event); |
|
action = WLAN_SP_MESH_PEERING_CLOSE; |
|
break; |
|
case OPN_ACPT: |
|
/* retry timer is left untouched */ |
|
sta->mesh->plink_state = NL80211_PLINK_OPN_RCVD; |
|
action = WLAN_SP_MESH_PEERING_CONFIRM; |
|
break; |
|
case CNF_ACPT: |
|
sta->mesh->plink_state = NL80211_PLINK_CNF_RCVD; |
|
mod_plink_timer(sta, mshcfg->dot11MeshConfirmTimeout); |
|
break; |
|
default: |
|
break; |
|
} |
|
break; |
|
case NL80211_PLINK_OPN_RCVD: |
|
switch (event) { |
|
case OPN_RJCT: |
|
case CNF_RJCT: |
|
case CLS_ACPT: |
|
mesh_plink_close(sdata, sta, event); |
|
action = WLAN_SP_MESH_PEERING_CLOSE; |
|
break; |
|
case OPN_ACPT: |
|
action = WLAN_SP_MESH_PEERING_CONFIRM; |
|
break; |
|
case CNF_ACPT: |
|
changed |= mesh_plink_establish(sdata, sta); |
|
break; |
|
default: |
|
break; |
|
} |
|
break; |
|
case NL80211_PLINK_CNF_RCVD: |
|
switch (event) { |
|
case OPN_RJCT: |
|
case CNF_RJCT: |
|
case CLS_ACPT: |
|
mesh_plink_close(sdata, sta, event); |
|
action = WLAN_SP_MESH_PEERING_CLOSE; |
|
break; |
|
case OPN_ACPT: |
|
changed |= mesh_plink_establish(sdata, sta); |
|
action = WLAN_SP_MESH_PEERING_CONFIRM; |
|
break; |
|
default: |
|
break; |
|
} |
|
break; |
|
case NL80211_PLINK_ESTAB: |
|
switch (event) { |
|
case CLS_ACPT: |
|
changed |= __mesh_plink_deactivate(sta); |
|
changed |= mesh_set_ht_prot_mode(sdata); |
|
changed |= mesh_set_short_slot_time(sdata); |
|
mesh_plink_close(sdata, sta, event); |
|
action = WLAN_SP_MESH_PEERING_CLOSE; |
|
flush = true; |
|
break; |
|
case OPN_ACPT: |
|
action = WLAN_SP_MESH_PEERING_CONFIRM; |
|
break; |
|
default: |
|
break; |
|
} |
|
break; |
|
case NL80211_PLINK_HOLDING: |
|
switch (event) { |
|
case CLS_ACPT: |
|
del_timer(&sta->mesh->plink_timer); |
|
mesh_plink_fsm_restart(sta); |
|
break; |
|
case OPN_ACPT: |
|
case CNF_ACPT: |
|
case OPN_RJCT: |
|
case CNF_RJCT: |
|
action = WLAN_SP_MESH_PEERING_CLOSE; |
|
break; |
|
default: |
|
break; |
|
} |
|
break; |
|
default: |
|
/* should not get here, PLINK_BLOCKED is dealt with at the |
|
* beginning of the function |
|
*/ |
|
break; |
|
} |
|
spin_unlock_bh(&sta->mesh->plink_lock); |
|
if (flush) |
|
mesh_path_flush_by_nexthop(sta); |
|
if (action) { |
|
mesh_plink_frame_tx(sdata, sta, action, sta->sta.addr, |
|
sta->mesh->llid, sta->mesh->plid, |
|
sta->mesh->reason); |
|
|
|
/* also send confirm in open case */ |
|
if (action == WLAN_SP_MESH_PEERING_OPEN) { |
|
mesh_plink_frame_tx(sdata, sta, |
|
WLAN_SP_MESH_PEERING_CONFIRM, |
|
sta->sta.addr, sta->mesh->llid, |
|
sta->mesh->plid, 0); |
|
} |
|
} |
|
|
|
return changed; |
|
} |
|
|
|
/* |
|
* mesh_plink_get_event - get correct MPM event |
|
* |
|
* @sdata: interface |
|
* @sta: peer, leave NULL if processing a frame from a new suitable peer |
|
* @elems: peering management IEs |
|
* @ftype: frame type |
|
* @llid: peer's peer link ID |
|
* @plid: peer's local link ID |
|
* |
|
* Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as |
|
* an error. |
|
*/ |
|
static enum plink_event |
|
mesh_plink_get_event(struct ieee80211_sub_if_data *sdata, |
|
struct sta_info *sta, |
|
struct ieee802_11_elems *elems, |
|
enum ieee80211_self_protected_actioncode ftype, |
|
u16 llid, u16 plid) |
|
{ |
|
enum plink_event event = PLINK_UNDEFINED; |
|
u8 ie_len = elems->peering_len; |
|
bool matches_local; |
|
|
|
matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE || |
|
mesh_matches_local(sdata, elems)); |
|
|
|
/* deny open request from non-matching peer */ |
|
if (!matches_local && !sta) { |
|
event = OPN_RJCT; |
|
goto out; |
|
} |
|
|
|
if (!sta) { |
|
if (ftype != WLAN_SP_MESH_PEERING_OPEN) { |
|
mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n"); |
|
goto out; |
|
} |
|
/* ftype == WLAN_SP_MESH_PEERING_OPEN */ |
|
if (!mesh_plink_free_count(sdata)) { |
|
mpl_dbg(sdata, "Mesh plink error: no more free plinks\n"); |
|
goto out; |
|
} |
|
|
|
/* new matching peer */ |
|
event = OPN_ACPT; |
|
goto out; |
|
} else { |
|
if (!test_sta_flag(sta, WLAN_STA_AUTH)) { |
|
mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n"); |
|
goto out; |
|
} |
|
if (sta->mesh->plink_state == NL80211_PLINK_BLOCKED) |
|
goto out; |
|
} |
|
|
|
switch (ftype) { |
|
case WLAN_SP_MESH_PEERING_OPEN: |
|
if (!matches_local) |
|
event = OPN_RJCT; |
|
if (!mesh_plink_free_count(sdata) || |
|
(sta->mesh->plid && sta->mesh->plid != plid)) |
|
event = OPN_IGNR; |
|
else |
|
event = OPN_ACPT; |
|
break; |
|
case WLAN_SP_MESH_PEERING_CONFIRM: |
|
if (!matches_local) |
|
event = CNF_RJCT; |
|
if (!mesh_plink_free_count(sdata) || |
|
sta->mesh->llid != llid || |
|
(sta->mesh->plid && sta->mesh->plid != plid)) |
|
event = CNF_IGNR; |
|
else |
|
event = CNF_ACPT; |
|
break; |
|
case WLAN_SP_MESH_PEERING_CLOSE: |
|
if (sta->mesh->plink_state == NL80211_PLINK_ESTAB) |
|
/* Do not check for llid or plid. This does not |
|
* follow the standard but since multiple plinks |
|
* per sta are not supported, it is necessary in |
|
* order to avoid a livelock when MP A sees an |
|
* establish peer link to MP B but MP B does not |
|
* see it. This can be caused by a timeout in |
|
* B's peer link establishment or B beign |
|
* restarted. |
|
*/ |
|
event = CLS_ACPT; |
|
else if (sta->mesh->plid != plid) |
|
event = CLS_IGNR; |
|
else if (ie_len == 8 && sta->mesh->llid != llid) |
|
event = CLS_IGNR; |
|
else |
|
event = CLS_ACPT; |
|
break; |
|
default: |
|
mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n"); |
|
break; |
|
} |
|
|
|
out: |
|
return event; |
|
} |
|
|
|
static void |
|
mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata, |
|
struct ieee80211_mgmt *mgmt, |
|
struct ieee802_11_elems *elems, |
|
struct ieee80211_rx_status *rx_status) |
|
{ |
|
|
|
struct sta_info *sta; |
|
enum plink_event event; |
|
enum ieee80211_self_protected_actioncode ftype; |
|
u32 changed = 0; |
|
u8 ie_len = elems->peering_len; |
|
u16 plid, llid = 0; |
|
|
|
if (!elems->peering) { |
|
mpl_dbg(sdata, |
|
"Mesh plink: missing necessary peer link ie\n"); |
|
return; |
|
} |
|
|
|
if (elems->rsn_len && |
|
sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { |
|
mpl_dbg(sdata, |
|
"Mesh plink: can't establish link with secure peer\n"); |
|
return; |
|
} |
|
|
|
ftype = mgmt->u.action.u.self_prot.action_code; |
|
if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) || |
|
(ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) || |
|
(ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6 |
|
&& ie_len != 8)) { |
|
mpl_dbg(sdata, |
|
"Mesh plink: incorrect plink ie length %d %d\n", |
|
ftype, ie_len); |
|
return; |
|
} |
|
|
|
if (ftype != WLAN_SP_MESH_PEERING_CLOSE && |
|
(!elems->mesh_id || !elems->mesh_config)) { |
|
mpl_dbg(sdata, "Mesh plink: missing necessary ie\n"); |
|
return; |
|
} |
|
/* Note the lines below are correct, the llid in the frame is the plid |
|
* from the point of view of this host. |
|
*/ |
|
plid = get_unaligned_le16(PLINK_GET_LLID(elems->peering)); |
|
if (ftype == WLAN_SP_MESH_PEERING_CONFIRM || |
|
(ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) |
|
llid = get_unaligned_le16(PLINK_GET_PLID(elems->peering)); |
|
|
|
/* WARNING: Only for sta pointer, is dropped & re-acquired */ |
|
rcu_read_lock(); |
|
|
|
sta = sta_info_get(sdata, mgmt->sa); |
|
|
|
if (ftype == WLAN_SP_MESH_PEERING_OPEN && |
|
!rssi_threshold_check(sdata, sta)) { |
|
mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n", |
|
mgmt->sa); |
|
goto unlock_rcu; |
|
} |
|
|
|
/* Now we will figure out the appropriate event... */ |
|
event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid); |
|
|
|
if (event == OPN_ACPT) { |
|
rcu_read_unlock(); |
|
/* allocate sta entry if necessary and update info */ |
|
sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status); |
|
if (!sta) { |
|
mpl_dbg(sdata, "Mesh plink: failed to init peer!\n"); |
|
goto unlock_rcu; |
|
} |
|
sta->mesh->plid = plid; |
|
} else if (!sta && event == OPN_RJCT) { |
|
mesh_plink_frame_tx(sdata, NULL, WLAN_SP_MESH_PEERING_CLOSE, |
|
mgmt->sa, 0, plid, |
|
WLAN_REASON_MESH_CONFIG); |
|
goto unlock_rcu; |
|
} else if (!sta || event == PLINK_UNDEFINED) { |
|
/* something went wrong */ |
|
goto unlock_rcu; |
|
} |
|
|
|
if (event == CNF_ACPT) { |
|
/* 802.11-2012 13.3.7.2 - update plid on CNF if not set */ |
|
if (!sta->mesh->plid) |
|
sta->mesh->plid = plid; |
|
|
|
sta->mesh->aid = get_unaligned_le16(PLINK_CNF_AID(mgmt)); |
|
} |
|
|
|
changed |= mesh_plink_fsm(sdata, sta, event); |
|
|
|
unlock_rcu: |
|
rcu_read_unlock(); |
|
|
|
if (changed) |
|
ieee80211_mbss_info_change_notify(sdata, changed); |
|
} |
|
|
|
void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, |
|
struct ieee80211_mgmt *mgmt, size_t len, |
|
struct ieee80211_rx_status *rx_status) |
|
{ |
|
struct ieee802_11_elems elems; |
|
size_t baselen; |
|
u8 *baseaddr; |
|
|
|
/* need action_code, aux */ |
|
if (len < IEEE80211_MIN_ACTION_SIZE + 3) |
|
return; |
|
|
|
if (sdata->u.mesh.user_mpm) |
|
/* userspace must register for these */ |
|
return; |
|
|
|
if (is_multicast_ether_addr(mgmt->da)) { |
|
mpl_dbg(sdata, |
|
"Mesh plink: ignore frame from multicast address\n"); |
|
return; |
|
} |
|
|
|
baseaddr = mgmt->u.action.u.self_prot.variable; |
|
baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt; |
|
if (mgmt->u.action.u.self_prot.action_code == |
|
WLAN_SP_MESH_PEERING_CONFIRM) { |
|
baseaddr += 4; |
|
baselen += 4; |
|
|
|
if (baselen > len) |
|
return; |
|
} |
|
ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems, |
|
mgmt->bssid, NULL); |
|
mesh_process_plink_frame(sdata, mgmt, &elems, rx_status); |
|
}
|
|
|