![Ashok Nagarajan](/assets/img/avatar_default.png)
Determining types of peers is modified to have less indentation. This change is suggested by Johannes. This patch also corrects the reference in comment to IEEE 802.11-2012 version. Signed-off-by: Ashok Nagarajan <ashok@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
964 lines
25 KiB
C
964 lines
25 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 "ieee80211_i.h"
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#include "rate.h"
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#include "mesh.h"
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#ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
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#define mpl_dbg(fmt, args...) printk(KERN_DEBUG fmt, ##args)
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#else
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#define mpl_dbg(fmt, args...) do { (void)(0); } while (0)
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#endif
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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->plink_timer, \
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jiffies + HZ * t / 1000))
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#define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries)
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#define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout)
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#define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout)
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#define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
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#define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
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/* We only need a valid sta if user configured a minimum rssi_threshold. */
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#define rssi_threshold_check(sta, sdata) \
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(sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\
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(sta && (s8) -ewma_read(&sta->avg_signal) > \
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sdata->u.mesh.mshcfg.rssi_threshold))
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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 int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
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enum ieee80211_self_protected_actioncode action,
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u8 *da, __le16 llid, __le16 plid, __le16 reason);
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static inline
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void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
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{
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atomic_inc(&sdata->u.mesh.mshstats.estab_plinks);
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mesh_accept_plinks_update(sdata);
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}
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static inline
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void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
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{
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atomic_dec(&sdata->u.mesh.mshstats.estab_plinks);
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mesh_accept_plinks_update(sdata);
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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->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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sta->plink_state = NL80211_PLINK_LISTEN;
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sta->llid = sta->plid = sta->reason = 0;
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sta->plink_retries = 0;
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}
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/*
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* Allocate mesh sta entry and insert into station table
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*/
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static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
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u8 *hw_addr)
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{
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struct sta_info *sta;
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if (sdata->local->num_sta >= MESH_MAX_PLINKS)
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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_info_pre_move_state(sta, IEEE80211_STA_AUTH);
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sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
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sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
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set_sta_flag(sta, WLAN_STA_WME);
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return sta;
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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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u32 changed = 0;
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u16 ht_opmode;
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bool non_ht_sta = false, ht20_sta = false;
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if (local->_oper_channel_type == NL80211_CHAN_NO_HT)
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return 0;
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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->plink_state != NL80211_PLINK_ESTAB)
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continue;
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switch (sta->ch_type) {
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case NL80211_CHAN_NO_HT:
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mpl_dbg("mesh_plink %pM: nonHT sta (%pM) is present",
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sdata->vif.addr, sta->sta.addr);
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non_ht_sta = true;
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goto out;
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case NL80211_CHAN_HT20:
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mpl_dbg("mesh_plink %pM: HT20 sta (%pM) is present",
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sdata->vif.addr, sta->sta.addr);
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ht20_sta = true;
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default:
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break;
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}
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}
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out:
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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 && local->_oper_channel_type > NL80211_CHAN_HT20)
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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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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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changed = BSS_CHANGED_HT;
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mpl_dbg("mesh_plink %pM: protection mode changed to %d",
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sdata->vif.addr, ht_opmode);
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}
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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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* Locking: the caller must hold sta->lock
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*/
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static bool __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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bool deactivated = false;
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if (sta->plink_state == NL80211_PLINK_ESTAB) {
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mesh_plink_dec_estab_count(sdata);
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deactivated = true;
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}
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sta->plink_state = NL80211_PLINK_BLOCKED;
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mesh_path_flush_by_nexthop(sta);
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return deactivated;
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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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void 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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bool deactivated;
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spin_lock_bh(&sta->lock);
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deactivated = __mesh_plink_deactivate(sta);
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sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED);
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mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
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sta->sta.addr, sta->llid, sta->plid,
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sta->reason);
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spin_unlock_bh(&sta->lock);
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if (deactivated)
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ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
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}
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static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
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enum ieee80211_self_protected_actioncode action,
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u8 *da, __le16 llid, __le16 plid, __le16 reason) {
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struct ieee80211_local *local = sdata->local;
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struct sk_buff *skb;
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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 = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
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sizeof(mgmt->u.action.u.self_prot);
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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 + 8 + /* peering IE */
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sdata->u.mesh.ie_len);
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if (!skb)
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return -1;
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skb_reserve(skb, local->tx_headroom);
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mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
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memset(mgmt, 0, 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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/* capability info */
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pos = skb_put(skb, 2);
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memset(pos, 0, 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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memcpy(pos + 2, &plid, 2);
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}
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if (ieee80211_add_srates_ie(&sdata->vif, skb, true) ||
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ieee80211_add_ext_srates_ie(&sdata->vif, skb, true) ||
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mesh_add_rsn_ie(skb, sdata) ||
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mesh_add_meshid_ie(skb, sdata) ||
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mesh_add_meshconf_ie(skb, sdata))
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return -1;
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} else { /* WLAN_SP_MESH_PEERING_CLOSE */
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if (mesh_add_meshid_ie(skb, sdata))
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return -1;
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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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return -EINVAL;
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}
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if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
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return -ENOMEM;
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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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memcpy(pos, &llid, 2);
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pos += 2;
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if (include_plid) {
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memcpy(pos, &plid, 2);
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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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memcpy(pos, &reason, 2);
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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(skb, sdata) ||
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mesh_add_ht_oper_ie(skb, sdata))
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return -1;
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}
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if (mesh_add_vendor_ies(skb, sdata))
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return -1;
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ieee80211_tx_skb(sdata, skb);
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return 0;
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}
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/* mesh_peer_init - initialize new mesh peer and return resulting sta_info
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*
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* @sdata: local meshif
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* @addr: peer's address
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* @elems: IEs from beacon or mesh peering frame
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*
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* call under RCU
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*/
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static struct sta_info *mesh_peer_init(struct ieee80211_sub_if_data *sdata,
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u8 *addr,
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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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enum ieee80211_band band = local->oper_channel->band;
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struct ieee80211_supported_band *sband;
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u32 rates, basic_rates = 0;
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struct sta_info *sta;
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bool insert = false;
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sband = local->hw.wiphy->bands[band];
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rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates);
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sta = sta_info_get(sdata, addr);
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if (!sta) {
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/* Userspace handles peer allocation when security is enabled */
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if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
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cfg80211_notify_new_peer_candidate(sdata->dev, addr,
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elems->ie_start,
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elems->total_len,
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GFP_ATOMIC);
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return NULL;
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}
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sta = mesh_plink_alloc(sdata, addr);
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if (!sta)
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return NULL;
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insert = true;
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}
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spin_lock_bh(&sta->lock);
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sta->last_rx = jiffies;
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sta->sta.supp_rates[band] = rates;
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if (elems->ht_cap_elem &&
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sdata->local->_oper_channel_type != NL80211_CHAN_NO_HT)
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ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
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elems->ht_cap_elem,
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&sta->sta.ht_cap);
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else
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memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap));
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if (elems->ht_operation) {
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if (!(elems->ht_operation->ht_param &
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IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
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sta->sta.ht_cap.cap &=
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~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
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sta->ch_type =
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ieee80211_ht_oper_to_channel_type(elems->ht_operation);
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}
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rate_control_rate_init(sta);
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spin_unlock_bh(&sta->lock);
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if (insert && sta_info_insert(sta))
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return NULL;
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return sta;
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}
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void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
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u8 *hw_addr,
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struct ieee802_11_elems *elems)
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{
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struct sta_info *sta;
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rcu_read_lock();
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sta = mesh_peer_init(sdata, hw_addr, elems);
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if (!sta)
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goto out;
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if (mesh_peer_accepts_plinks(elems) &&
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sta->plink_state == NL80211_PLINK_LISTEN &&
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sdata->u.mesh.accepting_plinks &&
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sdata->u.mesh.mshcfg.auto_open_plinks &&
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rssi_threshold_check(sta, sdata))
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mesh_plink_open(sta);
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out:
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rcu_read_unlock();
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}
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static void mesh_plink_timer(unsigned long data)
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{
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struct sta_info *sta;
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__le16 llid, plid, reason;
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struct ieee80211_sub_if_data *sdata;
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/*
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* This STA is valid because sta_info_destroy() will
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* del_timer_sync() this timer after having made sure
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* it cannot be readded (by deleting the plink.)
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*/
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sta = (struct sta_info *) data;
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if (sta->sdata->local->quiescing) {
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sta->plink_timer_was_running = true;
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return;
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}
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spin_lock_bh(&sta->lock);
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if (sta->ignore_plink_timer) {
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sta->ignore_plink_timer = false;
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spin_unlock_bh(&sta->lock);
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return;
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}
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mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
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sta->sta.addr, sta->plink_state);
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reason = 0;
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llid = sta->llid;
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plid = sta->plid;
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sdata = sta->sdata;
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switch (sta->plink_state) {
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case NL80211_PLINK_OPN_RCVD:
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case NL80211_PLINK_OPN_SNT:
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/* retry timer */
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if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
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u32 rand;
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mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
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sta->sta.addr, sta->plink_retries,
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sta->plink_timeout);
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get_random_bytes(&rand, sizeof(u32));
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sta->plink_timeout = sta->plink_timeout +
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rand % sta->plink_timeout;
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++sta->plink_retries;
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mod_plink_timer(sta, sta->plink_timeout);
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spin_unlock_bh(&sta->lock);
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mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
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sta->sta.addr, llid, 0, 0);
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break;
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}
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reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES);
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/* fall through on else */
|
|
case NL80211_PLINK_CNF_RCVD:
|
|
/* confirm timer */
|
|
if (!reason)
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT);
|
|
sta->plink_state = NL80211_PLINK_HOLDING;
|
|
mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
|
|
sta->sta.addr, llid, plid, reason);
|
|
break;
|
|
case NL80211_PLINK_HOLDING:
|
|
/* holding timer */
|
|
del_timer(&sta->plink_timer);
|
|
mesh_plink_fsm_restart(sta);
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
default:
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
void mesh_plink_quiesce(struct sta_info *sta)
|
|
{
|
|
if (del_timer_sync(&sta->plink_timer))
|
|
sta->plink_timer_was_running = true;
|
|
}
|
|
|
|
void mesh_plink_restart(struct sta_info *sta)
|
|
{
|
|
if (sta->plink_timer_was_running) {
|
|
add_timer(&sta->plink_timer);
|
|
sta->plink_timer_was_running = false;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
|
|
{
|
|
sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
|
|
sta->plink_timer.data = (unsigned long) sta;
|
|
sta->plink_timer.function = mesh_plink_timer;
|
|
sta->plink_timeout = timeout;
|
|
add_timer(&sta->plink_timer);
|
|
}
|
|
|
|
int mesh_plink_open(struct sta_info *sta)
|
|
{
|
|
__le16 llid;
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
|
|
if (!test_sta_flag(sta, WLAN_STA_AUTH))
|
|
return -EPERM;
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
get_random_bytes(&llid, 2);
|
|
sta->llid = llid;
|
|
if (sta->plink_state != NL80211_PLINK_LISTEN) {
|
|
spin_unlock_bh(&sta->lock);
|
|
return -EBUSY;
|
|
}
|
|
sta->plink_state = NL80211_PLINK_OPN_SNT;
|
|
mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
|
|
spin_unlock_bh(&sta->lock);
|
|
mpl_dbg("Mesh plink: starting establishment with %pM\n",
|
|
sta->sta.addr);
|
|
|
|
return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
|
|
sta->sta.addr, llid, 0, 0);
|
|
}
|
|
|
|
void mesh_plink_block(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
bool deactivated;
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
deactivated = __mesh_plink_deactivate(sta);
|
|
sta->plink_state = NL80211_PLINK_BLOCKED;
|
|
spin_unlock_bh(&sta->lock);
|
|
|
|
if (deactivated)
|
|
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
|
|
}
|
|
|
|
|
|
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;
|
|
struct sta_info *sta;
|
|
enum plink_event event;
|
|
enum ieee80211_self_protected_actioncode ftype;
|
|
size_t baselen;
|
|
bool matches_local = true;
|
|
u8 ie_len;
|
|
u8 *baseaddr;
|
|
u32 changed = 0;
|
|
__le16 plid, llid, reason;
|
|
#ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
|
|
static const char *mplstates[] = {
|
|
[NL80211_PLINK_LISTEN] = "LISTEN",
|
|
[NL80211_PLINK_OPN_SNT] = "OPN-SNT",
|
|
[NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
|
|
[NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
|
|
[NL80211_PLINK_ESTAB] = "ESTAB",
|
|
[NL80211_PLINK_HOLDING] = "HOLDING",
|
|
[NL80211_PLINK_BLOCKED] = "BLOCKED"
|
|
};
|
|
#endif
|
|
|
|
/* need action_code, aux */
|
|
if (len < IEEE80211_MIN_ACTION_SIZE + 3)
|
|
return;
|
|
|
|
if (is_multicast_ether_addr(mgmt->da)) {
|
|
mpl_dbg("Mesh plink: ignore frame from multicast address");
|
|
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;
|
|
}
|
|
ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
|
|
if (!elems.peering) {
|
|
mpl_dbg("Mesh plink: missing necessary peer link ie\n");
|
|
return;
|
|
}
|
|
if (elems.rsn_len &&
|
|
sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
|
|
mpl_dbg("Mesh plink: can't establish link with secure peer\n");
|
|
return;
|
|
}
|
|
|
|
ftype = mgmt->u.action.u.self_prot.action_code;
|
|
ie_len = elems.peering_len;
|
|
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("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("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.
|
|
*/
|
|
memcpy(&plid, PLINK_GET_LLID(elems.peering), 2);
|
|
if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
|
|
(ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
|
|
memcpy(&llid, PLINK_GET_PLID(elems.peering), 2);
|
|
|
|
rcu_read_lock();
|
|
|
|
sta = sta_info_get(sdata, mgmt->sa);
|
|
if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) {
|
|
mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
|
|
!rssi_threshold_check(sta, sdata)) {
|
|
mpl_dbg("Mesh plink: %pM does not meet rssi threshold\n",
|
|
mgmt->sa);
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) {
|
|
mpl_dbg("Mesh plink: Action frame from non-authed peer\n");
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) {
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
/* Now we will figure out the appropriate event... */
|
|
event = PLINK_UNDEFINED;
|
|
if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
|
|
!mesh_matches_local(sdata, &elems)) {
|
|
matches_local = false;
|
|
switch (ftype) {
|
|
case WLAN_SP_MESH_PEERING_OPEN:
|
|
event = OPN_RJCT;
|
|
break;
|
|
case WLAN_SP_MESH_PEERING_CONFIRM:
|
|
event = CNF_RJCT;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!sta && !matches_local) {
|
|
rcu_read_unlock();
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
|
|
llid = 0;
|
|
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
|
|
mgmt->sa, llid, plid, reason);
|
|
return;
|
|
} else if (!sta) {
|
|
/* ftype == WLAN_SP_MESH_PEERING_OPEN */
|
|
if (!mesh_plink_free_count(sdata)) {
|
|
mpl_dbg("Mesh plink error: no more free plinks\n");
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
event = OPN_ACPT;
|
|
} else if (matches_local) {
|
|
switch (ftype) {
|
|
case WLAN_SP_MESH_PEERING_OPEN:
|
|
if (!mesh_plink_free_count(sdata) ||
|
|
(sta->plid && sta->plid != plid))
|
|
event = OPN_IGNR;
|
|
else
|
|
event = OPN_ACPT;
|
|
break;
|
|
case WLAN_SP_MESH_PEERING_CONFIRM:
|
|
if (!mesh_plink_free_count(sdata) ||
|
|
(sta->llid != llid || sta->plid != plid))
|
|
event = CNF_IGNR;
|
|
else
|
|
event = CNF_ACPT;
|
|
break;
|
|
case WLAN_SP_MESH_PEERING_CLOSE:
|
|
if (sta->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->plid != plid)
|
|
event = CLS_IGNR;
|
|
else if (ie_len == 7 && sta->llid != llid)
|
|
event = CLS_IGNR;
|
|
else
|
|
event = CLS_ACPT;
|
|
break;
|
|
default:
|
|
mpl_dbg("Mesh plink: unknown frame subtype\n");
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (event == OPN_ACPT) {
|
|
/* allocate sta entry if necessary and update info */
|
|
sta = mesh_peer_init(sdata, mgmt->sa, &elems);
|
|
if (!sta) {
|
|
mpl_dbg("Mesh plink: failed to init peer!\n");
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
}
|
|
|
|
mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
|
|
mgmt->sa, mplstates[sta->plink_state],
|
|
le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
|
|
event);
|
|
reason = 0;
|
|
spin_lock_bh(&sta->lock);
|
|
switch (sta->plink_state) {
|
|
/* spin_unlock as soon as state is updated at each case */
|
|
case NL80211_PLINK_LISTEN:
|
|
switch (event) {
|
|
case CLS_ACPT:
|
|
mesh_plink_fsm_restart(sta);
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
case OPN_ACPT:
|
|
sta->plink_state = NL80211_PLINK_OPN_RCVD;
|
|
sta->plid = plid;
|
|
get_random_bytes(&llid, 2);
|
|
sta->llid = llid;
|
|
mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata,
|
|
WLAN_SP_MESH_PEERING_OPEN,
|
|
sta->sta.addr, llid, 0, 0);
|
|
mesh_plink_frame_tx(sdata,
|
|
WLAN_SP_MESH_PEERING_CONFIRM,
|
|
sta->sta.addr, llid, plid, 0);
|
|
break;
|
|
default:
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case NL80211_PLINK_OPN_SNT:
|
|
switch (event) {
|
|
case OPN_RJCT:
|
|
case CNF_RJCT:
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
|
|
case CLS_ACPT:
|
|
if (!reason)
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
|
|
sta->reason = reason;
|
|
sta->plink_state = NL80211_PLINK_HOLDING;
|
|
if (!mod_plink_timer(sta,
|
|
dot11MeshHoldingTimeout(sdata)))
|
|
sta->ignore_plink_timer = true;
|
|
|
|
llid = sta->llid;
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata,
|
|
WLAN_SP_MESH_PEERING_CLOSE,
|
|
sta->sta.addr, llid, plid, reason);
|
|
break;
|
|
case OPN_ACPT:
|
|
/* retry timer is left untouched */
|
|
sta->plink_state = NL80211_PLINK_OPN_RCVD;
|
|
sta->plid = plid;
|
|
llid = sta->llid;
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata,
|
|
WLAN_SP_MESH_PEERING_CONFIRM,
|
|
sta->sta.addr, llid, plid, 0);
|
|
break;
|
|
case CNF_ACPT:
|
|
sta->plink_state = NL80211_PLINK_CNF_RCVD;
|
|
if (!mod_plink_timer(sta,
|
|
dot11MeshConfirmTimeout(sdata)))
|
|
sta->ignore_plink_timer = true;
|
|
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
default:
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case NL80211_PLINK_OPN_RCVD:
|
|
switch (event) {
|
|
case OPN_RJCT:
|
|
case CNF_RJCT:
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
|
|
case CLS_ACPT:
|
|
if (!reason)
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
|
|
sta->reason = reason;
|
|
sta->plink_state = NL80211_PLINK_HOLDING;
|
|
if (!mod_plink_timer(sta,
|
|
dot11MeshHoldingTimeout(sdata)))
|
|
sta->ignore_plink_timer = true;
|
|
|
|
llid = sta->llid;
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
|
|
sta->sta.addr, llid, plid, reason);
|
|
break;
|
|
case OPN_ACPT:
|
|
llid = sta->llid;
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata,
|
|
WLAN_SP_MESH_PEERING_CONFIRM,
|
|
sta->sta.addr, llid, plid, 0);
|
|
break;
|
|
case CNF_ACPT:
|
|
del_timer(&sta->plink_timer);
|
|
sta->plink_state = NL80211_PLINK_ESTAB;
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_inc_estab_count(sdata);
|
|
changed |= mesh_set_ht_prot_mode(sdata);
|
|
changed |= BSS_CHANGED_BEACON;
|
|
mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
|
|
sta->sta.addr);
|
|
break;
|
|
default:
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case NL80211_PLINK_CNF_RCVD:
|
|
switch (event) {
|
|
case OPN_RJCT:
|
|
case CNF_RJCT:
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
|
|
case CLS_ACPT:
|
|
if (!reason)
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
|
|
sta->reason = reason;
|
|
sta->plink_state = NL80211_PLINK_HOLDING;
|
|
if (!mod_plink_timer(sta,
|
|
dot11MeshHoldingTimeout(sdata)))
|
|
sta->ignore_plink_timer = true;
|
|
|
|
llid = sta->llid;
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata,
|
|
WLAN_SP_MESH_PEERING_CLOSE,
|
|
sta->sta.addr, llid, plid, reason);
|
|
break;
|
|
case OPN_ACPT:
|
|
del_timer(&sta->plink_timer);
|
|
sta->plink_state = NL80211_PLINK_ESTAB;
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_inc_estab_count(sdata);
|
|
changed |= mesh_set_ht_prot_mode(sdata);
|
|
changed |= BSS_CHANGED_BEACON;
|
|
mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
|
|
sta->sta.addr);
|
|
mesh_plink_frame_tx(sdata,
|
|
WLAN_SP_MESH_PEERING_CONFIRM,
|
|
sta->sta.addr, llid, plid, 0);
|
|
break;
|
|
default:
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case NL80211_PLINK_ESTAB:
|
|
switch (event) {
|
|
case CLS_ACPT:
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
|
|
sta->reason = reason;
|
|
__mesh_plink_deactivate(sta);
|
|
sta->plink_state = NL80211_PLINK_HOLDING;
|
|
llid = sta->llid;
|
|
mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
|
|
spin_unlock_bh(&sta->lock);
|
|
changed |= mesh_set_ht_prot_mode(sdata);
|
|
changed |= BSS_CHANGED_BEACON;
|
|
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
|
|
sta->sta.addr, llid, plid, reason);
|
|
break;
|
|
case OPN_ACPT:
|
|
llid = sta->llid;
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata,
|
|
WLAN_SP_MESH_PEERING_CONFIRM,
|
|
sta->sta.addr, llid, plid, 0);
|
|
break;
|
|
default:
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
}
|
|
break;
|
|
case NL80211_PLINK_HOLDING:
|
|
switch (event) {
|
|
case CLS_ACPT:
|
|
if (del_timer(&sta->plink_timer))
|
|
sta->ignore_plink_timer = 1;
|
|
mesh_plink_fsm_restart(sta);
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
case OPN_ACPT:
|
|
case CNF_ACPT:
|
|
case OPN_RJCT:
|
|
case CNF_RJCT:
|
|
llid = sta->llid;
|
|
reason = sta->reason;
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
|
|
sta->sta.addr, llid, plid, reason);
|
|
break;
|
|
default:
|
|
spin_unlock_bh(&sta->lock);
|
|
}
|
|
break;
|
|
default:
|
|
/* should not get here, PLINK_BLOCKED is dealt with at the
|
|
* beginning of the function
|
|
*/
|
|
spin_unlock_bh(&sta->lock);
|
|
break;
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
if (changed)
|
|
ieee80211_bss_info_change_notify(sdata, changed);
|
|
}
|