mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
bae35d92b6
Rate control is re-initialized whenever a beacon from a mesh peer received, breaking the algorithms and resulting in low performance. Return early from mesh_peer_init if we already established a link with this peer to avoid this. Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com> [clarify commit message] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
973 lines
25 KiB
C
973 lines
25 KiB
C
/*
|
|
* Copyright (c) 2008, 2009 open80211s Ltd.
|
|
* Author: Luis Carlos Cobo <luisca@cozybit.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/gfp.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/random.h>
|
|
#include "ieee80211_i.h"
|
|
#include "rate.h"
|
|
#include "mesh.h"
|
|
|
|
#define PLINK_GET_LLID(p) (p + 2)
|
|
#define PLINK_GET_PLID(p) (p + 4)
|
|
|
|
#define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
|
|
jiffies + HZ * t / 1000))
|
|
|
|
#define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries)
|
|
#define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout)
|
|
#define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout)
|
|
#define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
|
|
#define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
|
|
|
|
/* We only need a valid sta if user configured a minimum rssi_threshold. */
|
|
#define rssi_threshold_check(sta, sdata) \
|
|
(sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\
|
|
(sta && (s8) -ewma_read(&sta->avg_signal) > \
|
|
sdata->u.mesh.mshcfg.rssi_threshold))
|
|
|
|
enum plink_event {
|
|
PLINK_UNDEFINED,
|
|
OPN_ACPT,
|
|
OPN_RJCT,
|
|
OPN_IGNR,
|
|
CNF_ACPT,
|
|
CNF_RJCT,
|
|
CNF_IGNR,
|
|
CLS_ACPT,
|
|
CLS_IGNR
|
|
};
|
|
|
|
static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
|
|
enum ieee80211_self_protected_actioncode action,
|
|
u8 *da, __le16 llid, __le16 plid, __le16 reason);
|
|
|
|
static inline
|
|
void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
atomic_inc(&sdata->u.mesh.mshstats.estab_plinks);
|
|
mesh_accept_plinks_update(sdata);
|
|
}
|
|
|
|
static inline
|
|
void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
atomic_dec(&sdata->u.mesh.mshstats.estab_plinks);
|
|
mesh_accept_plinks_update(sdata);
|
|
}
|
|
|
|
/**
|
|
* mesh_plink_fsm_restart - restart a mesh peer link finite state machine
|
|
*
|
|
* @sta: mesh peer link to restart
|
|
*
|
|
* Locking: this function must be called holding sta->lock
|
|
*/
|
|
static inline void mesh_plink_fsm_restart(struct sta_info *sta)
|
|
{
|
|
sta->plink_state = NL80211_PLINK_LISTEN;
|
|
sta->llid = sta->plid = sta->reason = 0;
|
|
sta->plink_retries = 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate mesh sta entry and insert into station table
|
|
*/
|
|
static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
|
|
u8 *hw_addr)
|
|
{
|
|
struct sta_info *sta;
|
|
|
|
if (sdata->local->num_sta >= MESH_MAX_PLINKS)
|
|
return NULL;
|
|
|
|
sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
|
|
if (!sta)
|
|
return NULL;
|
|
|
|
sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
|
|
sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
|
|
sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
|
|
|
|
set_sta_flag(sta, WLAN_STA_WME);
|
|
|
|
return sta;
|
|
}
|
|
|
|
/**
|
|
* mesh_set_ht_prot_mode - set correct HT protection mode
|
|
*
|
|
* Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT
|
|
* mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT
|
|
* mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is
|
|
* selected if any non-HT peers are present in our MBSS. 20MHz-protection mode
|
|
* is selected if all peers in our 20/40MHz MBSS support HT and atleast one
|
|
* HT20 peer is present. Otherwise no-protection mode is selected.
|
|
*/
|
|
static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sta_info *sta;
|
|
u32 changed = 0;
|
|
u16 ht_opmode;
|
|
bool non_ht_sta = false, ht20_sta = false;
|
|
|
|
if (local->_oper_channel_type == NL80211_CHAN_NO_HT)
|
|
return 0;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(sta, &local->sta_list, list) {
|
|
if (sdata != sta->sdata ||
|
|
sta->plink_state != NL80211_PLINK_ESTAB)
|
|
continue;
|
|
|
|
switch (sta->ch_type) {
|
|
case NL80211_CHAN_NO_HT:
|
|
mpl_dbg(sdata,
|
|
"mesh_plink %pM: nonHT sta (%pM) is present\n",
|
|
sdata->vif.addr, sta->sta.addr);
|
|
non_ht_sta = true;
|
|
goto out;
|
|
case NL80211_CHAN_HT20:
|
|
mpl_dbg(sdata,
|
|
"mesh_plink %pM: HT20 sta (%pM) is present\n",
|
|
sdata->vif.addr, sta->sta.addr);
|
|
ht20_sta = true;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
|
|
if (non_ht_sta)
|
|
ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED;
|
|
else if (ht20_sta && local->_oper_channel_type > NL80211_CHAN_HT20)
|
|
ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ;
|
|
else
|
|
ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
|
|
|
|
if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
|
|
sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
|
|
sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
|
|
changed = BSS_CHANGED_HT;
|
|
mpl_dbg(sdata,
|
|
"mesh_plink %pM: protection mode changed to %d\n",
|
|
sdata->vif.addr, ht_opmode);
|
|
}
|
|
|
|
return changed;
|
|
}
|
|
|
|
/**
|
|
* __mesh_plink_deactivate - deactivate mesh peer link
|
|
*
|
|
* @sta: mesh peer link to deactivate
|
|
*
|
|
* All mesh paths with this peer as next hop will be flushed
|
|
*
|
|
* Locking: the caller must hold sta->lock
|
|
*/
|
|
static bool __mesh_plink_deactivate(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
bool deactivated = false;
|
|
|
|
if (sta->plink_state == NL80211_PLINK_ESTAB) {
|
|
mesh_plink_dec_estab_count(sdata);
|
|
deactivated = true;
|
|
}
|
|
sta->plink_state = NL80211_PLINK_BLOCKED;
|
|
mesh_path_flush_by_nexthop(sta);
|
|
|
|
return deactivated;
|
|
}
|
|
|
|
/**
|
|
* mesh_plink_deactivate - deactivate mesh peer link
|
|
*
|
|
* @sta: mesh peer link to deactivate
|
|
*
|
|
* All mesh paths with this peer as next hop will be flushed
|
|
*/
|
|
void mesh_plink_deactivate(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->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED);
|
|
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
|
|
sta->sta.addr, sta->llid, sta->plid,
|
|
sta->reason);
|
|
spin_unlock_bh(&sta->lock);
|
|
|
|
if (deactivated)
|
|
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
|
|
}
|
|
|
|
static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
|
|
enum ieee80211_self_protected_actioncode action,
|
|
u8 *da, __le16 llid, __le16 plid, __le16 reason) {
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sk_buff *skb;
|
|
struct ieee80211_mgmt *mgmt;
|
|
bool include_plid = false;
|
|
u16 peering_proto = 0;
|
|
u8 *pos, ie_len = 4;
|
|
int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) +
|
|
sizeof(mgmt->u.action.u.self_prot);
|
|
|
|
skb = dev_alloc_skb(local->tx_headroom +
|
|
hdr_len +
|
|
2 + /* capability info */
|
|
2 + /* AID */
|
|
2 + 8 + /* supported rates */
|
|
2 + (IEEE80211_MAX_SUPP_RATES - 8) +
|
|
2 + sdata->u.mesh.mesh_id_len +
|
|
2 + sizeof(struct ieee80211_meshconf_ie) +
|
|
2 + sizeof(struct ieee80211_ht_cap) +
|
|
2 + sizeof(struct ieee80211_ht_operation) +
|
|
2 + 8 + /* peering IE */
|
|
sdata->u.mesh.ie_len);
|
|
if (!skb)
|
|
return -1;
|
|
skb_reserve(skb, local->tx_headroom);
|
|
mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
|
|
memset(mgmt, 0, hdr_len);
|
|
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
|
|
IEEE80211_STYPE_ACTION);
|
|
memcpy(mgmt->da, da, ETH_ALEN);
|
|
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
|
|
memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
|
|
mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED;
|
|
mgmt->u.action.u.self_prot.action_code = action;
|
|
|
|
if (action != WLAN_SP_MESH_PEERING_CLOSE) {
|
|
/* capability info */
|
|
pos = skb_put(skb, 2);
|
|
memset(pos, 0, 2);
|
|
if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
|
|
/* AID */
|
|
pos = skb_put(skb, 2);
|
|
memcpy(pos + 2, &plid, 2);
|
|
}
|
|
if (ieee80211_add_srates_ie(sdata, skb, true) ||
|
|
ieee80211_add_ext_srates_ie(sdata, skb, true) ||
|
|
mesh_add_rsn_ie(skb, sdata) ||
|
|
mesh_add_meshid_ie(skb, sdata) ||
|
|
mesh_add_meshconf_ie(skb, sdata))
|
|
return -1;
|
|
} else { /* WLAN_SP_MESH_PEERING_CLOSE */
|
|
if (mesh_add_meshid_ie(skb, sdata))
|
|
return -1;
|
|
}
|
|
|
|
/* Add Mesh Peering Management element */
|
|
switch (action) {
|
|
case WLAN_SP_MESH_PEERING_OPEN:
|
|
break;
|
|
case WLAN_SP_MESH_PEERING_CONFIRM:
|
|
ie_len += 2;
|
|
include_plid = true;
|
|
break;
|
|
case WLAN_SP_MESH_PEERING_CLOSE:
|
|
if (plid) {
|
|
ie_len += 2;
|
|
include_plid = true;
|
|
}
|
|
ie_len += 2; /* reason code */
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (WARN_ON(skb_tailroom(skb) < 2 + ie_len))
|
|
return -ENOMEM;
|
|
|
|
pos = skb_put(skb, 2 + ie_len);
|
|
*pos++ = WLAN_EID_PEER_MGMT;
|
|
*pos++ = ie_len;
|
|
memcpy(pos, &peering_proto, 2);
|
|
pos += 2;
|
|
memcpy(pos, &llid, 2);
|
|
pos += 2;
|
|
if (include_plid) {
|
|
memcpy(pos, &plid, 2);
|
|
pos += 2;
|
|
}
|
|
if (action == WLAN_SP_MESH_PEERING_CLOSE) {
|
|
memcpy(pos, &reason, 2);
|
|
pos += 2;
|
|
}
|
|
|
|
if (action != WLAN_SP_MESH_PEERING_CLOSE) {
|
|
if (mesh_add_ht_cap_ie(skb, sdata) ||
|
|
mesh_add_ht_oper_ie(skb, sdata))
|
|
return -1;
|
|
}
|
|
|
|
if (mesh_add_vendor_ies(skb, sdata))
|
|
return -1;
|
|
|
|
ieee80211_tx_skb(sdata, skb);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mesh_peer_init - initialize new mesh peer and return resulting sta_info
|
|
*
|
|
* @sdata: local meshif
|
|
* @addr: peer's address
|
|
* @elems: IEs from beacon or mesh peering frame
|
|
*
|
|
* call under RCU
|
|
*/
|
|
static struct sta_info *mesh_peer_init(struct ieee80211_sub_if_data *sdata,
|
|
u8 *addr,
|
|
struct ieee802_11_elems *elems)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
enum ieee80211_band band = local->oper_channel->band;
|
|
struct ieee80211_supported_band *sband;
|
|
u32 rates, basic_rates = 0;
|
|
struct sta_info *sta;
|
|
bool insert = false;
|
|
|
|
sband = local->hw.wiphy->bands[band];
|
|
rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates);
|
|
|
|
sta = sta_info_get(sdata, addr);
|
|
if (!sta) {
|
|
/* Userspace handles peer allocation when security is enabled */
|
|
if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
|
|
cfg80211_notify_new_peer_candidate(sdata->dev, addr,
|
|
elems->ie_start,
|
|
elems->total_len,
|
|
GFP_ATOMIC);
|
|
return NULL;
|
|
}
|
|
|
|
sta = mesh_plink_alloc(sdata, addr);
|
|
if (!sta)
|
|
return NULL;
|
|
insert = true;
|
|
}
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
sta->last_rx = jiffies;
|
|
if (sta->plink_state == NL80211_PLINK_ESTAB) {
|
|
spin_unlock_bh(&sta->lock);
|
|
return sta;
|
|
}
|
|
|
|
sta->sta.supp_rates[band] = rates;
|
|
if (elems->ht_cap_elem &&
|
|
sdata->local->_oper_channel_type != NL80211_CHAN_NO_HT)
|
|
ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
|
|
elems->ht_cap_elem,
|
|
&sta->sta.ht_cap);
|
|
else
|
|
memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap));
|
|
|
|
if (elems->ht_operation) {
|
|
if (!(elems->ht_operation->ht_param &
|
|
IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
|
|
sta->sta.ht_cap.cap &=
|
|
~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
|
|
sta->ch_type =
|
|
ieee80211_ht_oper_to_channel_type(elems->ht_operation);
|
|
}
|
|
|
|
rate_control_rate_init(sta);
|
|
spin_unlock_bh(&sta->lock);
|
|
|
|
if (insert && sta_info_insert(sta))
|
|
return NULL;
|
|
|
|
return sta;
|
|
}
|
|
|
|
void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
|
|
u8 *hw_addr,
|
|
struct ieee802_11_elems *elems)
|
|
{
|
|
struct sta_info *sta;
|
|
|
|
rcu_read_lock();
|
|
sta = mesh_peer_init(sdata, hw_addr, elems);
|
|
if (!sta)
|
|
goto out;
|
|
|
|
if (mesh_peer_accepts_plinks(elems) &&
|
|
sta->plink_state == NL80211_PLINK_LISTEN &&
|
|
sdata->u.mesh.accepting_plinks &&
|
|
sdata->u.mesh.mshcfg.auto_open_plinks &&
|
|
rssi_threshold_check(sta, sdata))
|
|
mesh_plink_open(sta);
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void mesh_plink_timer(unsigned long data)
|
|
{
|
|
struct sta_info *sta;
|
|
__le16 llid, plid, reason;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
/*
|
|
* This STA is valid because sta_info_destroy() will
|
|
* del_timer_sync() this timer after having made sure
|
|
* it cannot be readded (by deleting the plink.)
|
|
*/
|
|
sta = (struct sta_info *) data;
|
|
|
|
if (sta->sdata->local->quiescing) {
|
|
sta->plink_timer_was_running = true;
|
|
return;
|
|
}
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
if (sta->ignore_plink_timer) {
|
|
sta->ignore_plink_timer = false;
|
|
spin_unlock_bh(&sta->lock);
|
|
return;
|
|
}
|
|
mpl_dbg(sta->sdata,
|
|
"Mesh plink timer for %pM fired on state %d\n",
|
|
sta->sta.addr, sta->plink_state);
|
|
reason = 0;
|
|
llid = sta->llid;
|
|
plid = sta->plid;
|
|
sdata = sta->sdata;
|
|
|
|
switch (sta->plink_state) {
|
|
case NL80211_PLINK_OPN_RCVD:
|
|
case NL80211_PLINK_OPN_SNT:
|
|
/* retry timer */
|
|
if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
|
|
u32 rand;
|
|
mpl_dbg(sta->sdata,
|
|
"Mesh plink for %pM (retry, timeout): %d %d\n",
|
|
sta->sta.addr, sta->plink_retries,
|
|
sta->plink_timeout);
|
|
get_random_bytes(&rand, sizeof(u32));
|
|
sta->plink_timeout = sta->plink_timeout +
|
|
rand % sta->plink_timeout;
|
|
++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);
|
|
}
|