![Thomas Pedersen](/assets/img/avatar_default.png)
Although adding an IE is almost guaranteed to succeed since we already accounted for its length while allocating the skb, we should still free the skb in case of failure. Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
983 lines
26 KiB
C
983 lines
26 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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#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(sdata,
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"mesh_plink %pM: nonHT sta (%pM) is present\n",
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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(sdata,
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"mesh_plink %pM: HT20 sta (%pM) is present\n",
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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(sdata,
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"mesh_plink %pM: protection mode changed to %d\n",
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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_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 = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
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sizeof(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 + 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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info = IEEE80211_SKB_CB(skb);
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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, skb, true,
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local->oper_channel->band) ||
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ieee80211_add_ext_srates_ie(sdata, skb, true,
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local->oper_channel->band) ||
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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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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(skb, sdata))
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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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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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goto free;
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}
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if (mesh_add_vendor_ies(skb, sdata))
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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_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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if (sta->plink_state == NL80211_PLINK_ESTAB) {
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spin_unlock_bh(&sta->lock);
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return sta;
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}
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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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|
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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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|
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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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/*
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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(sta->sdata,
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"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(sta->sdata,
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"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;
|
|
mod_plink_timer(sta, sta->plink_timeout);
|
|
spin_unlock_bh(&sta->lock);
|
|
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
|
|
sta->sta.addr, llid, 0, 0);
|
|
break;
|
|
}
|
|
reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES);
|
|
/* 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(sdata,
|
|
"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;
|
|
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"
|
|
};
|
|
|
|
/* need action_code, aux */
|
|
if (len < IEEE80211_MIN_ACTION_SIZE + 3)
|
|
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;
|
|
}
|
|
ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
|
|
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;
|
|
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(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.
|
|
*/
|
|
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(sdata, "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(sdata, "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(sdata, "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(sdata, "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(sdata, "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(sdata, "Mesh plink: failed to init peer!\n");
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
}
|
|
|
|
mpl_dbg(sdata,
|
|
"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(sdata, "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(sdata, "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);
|
|
}
|