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/*
* 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->vif, skb, true) ||
ieee80211_add_ext_srates_ie(&sdata->vif, 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;
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);
}
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