1205 lines
31 KiB
C
1205 lines
31 KiB
C
/*
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* Copyright (c) 2008, 2009 open80211s Ltd.
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* Author: Luis Carlos Cobo <luisca@cozybit.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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#include "ieee80211_i.h"
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#include "rate.h"
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#include "mesh.h"
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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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#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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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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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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/* 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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* 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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* 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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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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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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* mesh_set_ht_prot_mode - set correct HT protection mode
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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 atleast 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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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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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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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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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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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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int hdr_len = offsetofend(struct ieee80211_mgmt, u.action.u.self_prot);
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int err = -ENOMEM;
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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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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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/* 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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/* 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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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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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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goto free;
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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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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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* __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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* 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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spin_lock_bh(&sta->mesh->plink_lock);
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changed = __mesh_plink_deactivate(sta);
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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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/* make sure no readers can access nexthop sta from here on */
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synchronize_net();
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return changed;
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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, bool insert)
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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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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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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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|
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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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ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
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elems->vht_cap_elem, sta);
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|
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if (bw != sta->sta.bandwidth)
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changed |= IEEE80211_RC_BW_CHANGED;
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|
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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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|
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if (insert)
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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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|
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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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|
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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 */
|
|
__set_bit(0, aid_map);
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|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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) {
|
|
if (mesh_peer_accepts_plinks(elems) &&
|
|
mesh_plink_availables(sdata))
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
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;
|
|
/* fall through */
|
|
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 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);
|
|
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);
|
|
mesh_process_plink_frame(sdata, mgmt, &elems);
|
|
}
|