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linux/net/mac80211/mlme.c

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/*
* BSS client mode implementation
* Copyright 2003-2008, Jouni Malinen <j@w1.fi>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
*
* 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/delay.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/pm_qos_params.h>
#include <linux/crc32.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "led.h"
#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_MAX_TRIES 3
#define IEEE80211_MAX_PROBE_TRIES 5
/*
* beacon loss detection timeout
* XXX: should depend on beacon interval
*/
#define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
/*
* Time the connection can be idle before we probe
* it to see if we can still talk to the AP.
*/
#define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
/*
* Time we wait for a probe response after sending
* a probe request because of beacon loss or for
* checking the connection still works.
*/
#define IEEE80211_PROBE_WAIT (HZ / 2)
#define TMR_RUNNING_TIMER 0
#define TMR_RUNNING_CHANSW 1
/*
* All cfg80211 functions have to be called outside a locked
* section so that they can acquire a lock themselves... This
* is much simpler than queuing up things in cfg80211, but we
* do need some indirection for that here.
*/
enum rx_mgmt_action {
/* no action required */
RX_MGMT_NONE,
/* caller must call cfg80211_send_rx_auth() */
RX_MGMT_CFG80211_AUTH,
/* caller must call cfg80211_send_rx_assoc() */
RX_MGMT_CFG80211_ASSOC,
/* caller must call cfg80211_send_deauth() */
RX_MGMT_CFG80211_DEAUTH,
/* caller must call cfg80211_send_disassoc() */
RX_MGMT_CFG80211_DISASSOC,
/* caller must call cfg80211_auth_timeout() & free work */
RX_MGMT_CFG80211_AUTH_TO,
/* caller must call cfg80211_assoc_timeout() & free work */
RX_MGMT_CFG80211_ASSOC_TO,
};
/* utils */
static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
WARN_ON(!mutex_is_locked(&ifmgd->mtx));
}
/*
* We can have multiple work items (and connection probing)
* scheduling this timer, but we need to take care to only
* reschedule it when it should fire _earlier_ than it was
* asked for before, or if it's not pending right now. This
* function ensures that. Note that it then is required to
* run this function for all timeouts after the first one
* has happened -- the work that runs from this timer will
* do that.
*/
static void run_again(struct ieee80211_if_managed *ifmgd,
unsigned long timeout)
{
ASSERT_MGD_MTX(ifmgd);
if (!timer_pending(&ifmgd->timer) ||
time_before(timeout, ifmgd->timer.expires))
mod_timer(&ifmgd->timer, timeout);
}
static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
{
if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
return;
mod_timer(&sdata->u.mgd.bcn_mon_timer,
round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
}
static int ecw2cw(int ecw)
{
return (1 << ecw) - 1;
}
static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
struct ieee80211_supported_band *sband,
u32 *rates)
{
int i, j, count;
*rates = 0;
count = 0;
for (i = 0; i < bss->supp_rates_len; i++) {
int rate = (bss->supp_rates[i] & 0x7F) * 5;
for (j = 0; j < sband->n_bitrates; j++)
if (sband->bitrates[j].bitrate == rate) {
*rates |= BIT(j);
count++;
break;
}
}
return count;
}
/*
* ieee80211_enable_ht should be called only after the operating band
* has been determined as ht configuration depends on the hw's
* HT abilities for a specific band.
*/
static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
struct ieee80211_ht_info *hti,
const u8 *bssid, u16 ap_ht_cap_flags)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_supported_band *sband;
struct sta_info *sta;
u32 changed = 0;
u16 ht_opmode;
bool enable_ht = true, ht_changed;
enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
/* HT is not supported */
if (!sband->ht_cap.ht_supported)
enable_ht = false;
/* check that channel matches the right operating channel */
if (local->hw.conf.channel->center_freq !=
ieee80211_channel_to_frequency(hti->control_chan))
enable_ht = false;
if (enable_ht) {
channel_type = NL80211_CHAN_HT20;
if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
(sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
(hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
if (!(local->hw.conf.channel->flags &
IEEE80211_CHAN_NO_HT40PLUS))
channel_type = NL80211_CHAN_HT40PLUS;
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
if (!(local->hw.conf.channel->flags &
IEEE80211_CHAN_NO_HT40MINUS))
channel_type = NL80211_CHAN_HT40MINUS;
break;
}
}
}
ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
channel_type != local->hw.conf.channel_type;
local->oper_channel_type = channel_type;
if (ht_changed) {
/* channel_type change automatically detected */
ieee80211_hw_config(local, 0);
rcu_read_lock();
sta = sta_info_get(local, bssid);
if (sta)
rate_control_rate_update(local, sband, sta,
IEEE80211_RC_HT_CHANGED);
rcu_read_unlock();
}
/* disable HT */
if (!enable_ht)
return 0;
ht_opmode = le16_to_cpu(hti->operation_mode);
/* if bss configuration changed store the new one */
if (!sdata->ht_opmode_valid ||
sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
changed |= BSS_CHANGED_HT;
sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
sdata->ht_opmode_valid = true;
}
return changed;
}
/* frame sending functions */
static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
u8 *pos;
const u8 *ies, *ht_ie;
int i, len, count, rates_len, supp_rates_len;
u16 capab;
int wmm = 0;
struct ieee80211_supported_band *sband;
u32 rates = 0;
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
sizeof(*mgmt) + 200 + wk->ie_len +
wk->ssid_len);
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
"frame\n", sdata->dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
capab = ifmgd->capab;
if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) {
if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
}
if (wk->bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
capab |= WLAN_CAPABILITY_PRIVACY;
if (wk->bss->wmm_used)
wmm = 1;
/* get all rates supported by the device and the AP as
* some APs don't like getting a superset of their rates
* in the association request (e.g. D-Link DAP 1353 in
* b-only mode) */
rates_len = ieee80211_compatible_rates(wk->bss, sband, &rates);
if ((wk->bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
(local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, wk->bss->cbss.bssid, ETH_ALEN);
memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
memcpy(mgmt->bssid, wk->bss->cbss.bssid, ETH_ALEN);
if (!is_zero_ether_addr(wk->prev_bssid)) {
skb_put(skb, 10);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_REASSOC_REQ);
mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
mgmt->u.reassoc_req.listen_interval =
cpu_to_le16(local->hw.conf.listen_interval);
memcpy(mgmt->u.reassoc_req.current_ap, wk->prev_bssid,
ETH_ALEN);
} else {
skb_put(skb, 4);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ASSOC_REQ);
mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
mgmt->u.assoc_req.listen_interval =
cpu_to_le16(local->hw.conf.listen_interval);
}
/* SSID */
ies = pos = skb_put(skb, 2 + wk->ssid_len);
*pos++ = WLAN_EID_SSID;
*pos++ = wk->ssid_len;
memcpy(pos, wk->ssid, wk->ssid_len);
/* add all rates which were marked to be used above */
supp_rates_len = rates_len;
if (supp_rates_len > 8)
supp_rates_len = 8;
len = sband->n_bitrates;
pos = skb_put(skb, supp_rates_len + 2);
*pos++ = WLAN_EID_SUPP_RATES;
*pos++ = supp_rates_len;
count = 0;
for (i = 0; i < sband->n_bitrates; i++) {
if (BIT(i) & rates) {
int rate = sband->bitrates[i].bitrate;
*pos++ = (u8) (rate / 5);
if (++count == 8)
break;
}
}
if (rates_len > count) {
pos = skb_put(skb, rates_len - count + 2);
*pos++ = WLAN_EID_EXT_SUPP_RATES;
*pos++ = rates_len - count;
for (i++; i < sband->n_bitrates; i++) {
if (BIT(i) & rates) {
int rate = sband->bitrates[i].bitrate;
*pos++ = (u8) (rate / 5);
}
}
}
if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
/* 1. power capabilities */
pos = skb_put(skb, 4);
*pos++ = WLAN_EID_PWR_CAPABILITY;
*pos++ = 2;
*pos++ = 0; /* min tx power */
*pos++ = local->hw.conf.channel->max_power; /* max tx power */
/* 2. supported channels */
/* TODO: get this in reg domain format */
pos = skb_put(skb, 2 * sband->n_channels + 2);
*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
*pos++ = 2 * sband->n_channels;
for (i = 0; i < sband->n_channels; i++) {
*pos++ = ieee80211_frequency_to_channel(
sband->channels[i].center_freq);
*pos++ = 1; /* one channel in the subband*/
}
}
if (wk->ie_len && wk->ie) {
pos = skb_put(skb, wk->ie_len);
memcpy(pos, wk->ie, wk->ie_len);
}
if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
pos = skb_put(skb, 9);
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
*pos++ = 7; /* len */
*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
*pos++ = 0x50;
*pos++ = 0xf2;
*pos++ = 2; /* WME */
*pos++ = 0; /* WME info */
*pos++ = 1; /* WME ver */
*pos++ = 0;
}
/* wmm support is a must to HT */
/*
* IEEE802.11n does not allow TKIP/WEP as pairwise
* ciphers in HT mode. We still associate in non-ht
* mode (11a/b/g) if any one of these ciphers is
* configured as pairwise.
*/
if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
sband->ht_cap.ht_supported &&
(ht_ie = ieee80211_bss_get_ie(&wk->bss->cbss, WLAN_EID_HT_INFORMATION)) &&
ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
(!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
struct ieee80211_ht_info *ht_info =
(struct ieee80211_ht_info *)(ht_ie + 2);
u16 cap = sband->ht_cap.cap;
__le16 tmp;
u32 flags = local->hw.conf.channel->flags;
switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
cap &= ~IEEE80211_HT_CAP_SGI_40;
}
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
cap &= ~IEEE80211_HT_CAP_SGI_40;
}
break;
}
tmp = cpu_to_le16(cap);
pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
*pos++ = WLAN_EID_HT_CAPABILITY;
*pos++ = sizeof(struct ieee80211_ht_cap);
memset(pos, 0, sizeof(struct ieee80211_ht_cap));
memcpy(pos, &tmp, sizeof(u16));
pos += sizeof(u16);
/* TODO: needs a define here for << 2 */
*pos++ = sband->ht_cap.ampdu_factor |
(sband->ht_cap.ampdu_density << 2);
memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
}
ieee80211_tx_skb(sdata, skb, 0);
}
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
const u8 *bssid, u16 stype, u16 reason,
void *cookie)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for "
"deauth/disassoc frame\n", sdata->dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, bssid, ETH_ALEN);
memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
memcpy(mgmt->bssid, bssid, ETH_ALEN);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
skb_put(skb, 2);
/* u.deauth.reason_code == u.disassoc.reason_code */
mgmt->u.deauth.reason_code = cpu_to_le16(reason);
if (stype == IEEE80211_STYPE_DEAUTH)
if (cookie)
__cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
else
cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
else
if (cookie)
__cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
else
cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
}
void ieee80211_send_pspoll(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_pspoll *pspoll;
struct sk_buff *skb;
u16 fc;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for "
"pspoll frame\n", sdata->dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
memset(pspoll, 0, sizeof(*pspoll));
fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
pspoll->frame_control = cpu_to_le16(fc);
pspoll->aid = cpu_to_le16(ifmgd->aid);
/* aid in PS-Poll has its two MSBs each set to 1 */
pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
ieee80211_tx_skb(sdata, skb, 0);
}
void ieee80211_send_nullfunc(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
int powersave)
{
struct sk_buff *skb;
struct ieee80211_hdr *nullfunc;
__le16 fc;
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
return;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
"frame\n", sdata->dev->name);
return;
}
skb_reserve(skb, local->hw.extra_tx_headroom);
nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
memset(nullfunc, 0, 24);
fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
IEEE80211_FCTL_TODS);
if (powersave)
fc |= cpu_to_le16(IEEE80211_FCTL_PM);
nullfunc->frame_control = fc;
memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
ieee80211_tx_skb(sdata, skb, 0);
}
/* spectrum management related things */
static void ieee80211_chswitch_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (!netif_running(sdata->dev))
return;
mutex_lock(&ifmgd->mtx);
if (!ifmgd->associated)
goto out;
sdata->local->oper_channel = sdata->local->csa_channel;
ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
/* XXX: shouldn't really modify cfg80211-owned data! */
ifmgd->associated->cbss.channel = sdata->local->oper_channel;
ieee80211_wake_queues_by_reason(&sdata->local->hw,
IEEE80211_QUEUE_STOP_REASON_CSA);
out:
ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
mutex_unlock(&ifmgd->mtx);
}
static void ieee80211_chswitch_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (sdata->local->quiescing) {
set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
return;
}
ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
}
void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel_sw_ie *sw_elem,
struct ieee80211_bss *bss)
{
struct ieee80211_channel *new_ch;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
ASSERT_MGD_MTX(ifmgd);
if (!ifmgd->associated)
return;
if (sdata->local->scanning)
return;
/* Disregard subsequent beacons if we are already running a timer
processing a CSA */
if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
return;
new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
return;
sdata->local->csa_channel = new_ch;
if (sw_elem->count <= 1) {
ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
} else {
ieee80211_stop_queues_by_reason(&sdata->local->hw,
IEEE80211_QUEUE_STOP_REASON_CSA);
ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
mod_timer(&ifmgd->chswitch_timer,
jiffies +
msecs_to_jiffies(sw_elem->count *
bss->cbss.beacon_interval));
}
}
static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
u16 capab_info, u8 *pwr_constr_elem,
u8 pwr_constr_elem_len)
{
struct ieee80211_conf *conf = &sdata->local->hw.conf;
if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
return;
/* Power constraint IE length should be 1 octet */
if (pwr_constr_elem_len != 1)
return;
if ((*pwr_constr_elem <= conf->channel->max_power) &&
(*pwr_constr_elem != sdata->local->power_constr_level)) {
sdata->local->power_constr_level = *pwr_constr_elem;
ieee80211_hw_config(sdata->local, 0);
}
}
/* powersave */
static void ieee80211_enable_ps(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_conf *conf = &local->hw.conf;
/*
* If we are scanning right now then the parameters will
* take effect when scan finishes.
*/
if (local->scanning)
return;
if (conf->dynamic_ps_timeout > 0 &&
!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(conf->dynamic_ps_timeout));
} else {
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
ieee80211_send_nullfunc(local, sdata, 1);
conf->flags |= IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
}
static void ieee80211_change_ps(struct ieee80211_local *local)
{
struct ieee80211_conf *conf = &local->hw.conf;
if (local->ps_sdata) {
ieee80211_enable_ps(local, local->ps_sdata);
} else if (conf->flags & IEEE80211_CONF_PS) {
conf->flags &= ~IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
del_timer_sync(&local->dynamic_ps_timer);
cancel_work_sync(&local->dynamic_ps_enable_work);
}
}
/* need to hold RTNL or interface lock */
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
{
struct ieee80211_sub_if_data *sdata, *found = NULL;
int count = 0;
if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
local->ps_sdata = NULL;
return;
}
list_for_each_entry(sdata, &local->interfaces, list) {
if (!netif_running(sdata->dev))
continue;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
continue;
found = sdata;
count++;
}
if (count == 1 && found->u.mgd.powersave &&
found->u.mgd.associated && list_empty(&found->u.mgd.work_list) &&
!(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL))) {
s32 beaconint_us;
if (latency < 0)
latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
beaconint_us = ieee80211_tu_to_usec(
found->vif.bss_conf.beacon_int);
if (beaconint_us > latency) {
local->ps_sdata = NULL;
} else {
u8 dtimper = found->vif.bss_conf.dtim_period;
int maxslp = 1;
if (dtimper > 1)
maxslp = min_t(int, dtimper,
latency / beaconint_us);
local->hw.conf.max_sleep_period = maxslp;
local->ps_sdata = found;
}
} else {
local->ps_sdata = NULL;
}
ieee80211_change_ps(local);
}
void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local,
dynamic_ps_disable_work);
if (local->hw.conf.flags & IEEE80211_CONF_PS) {
local->hw.conf.flags &= ~IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
ieee80211_wake_queues_by_reason(&local->hw,
IEEE80211_QUEUE_STOP_REASON_PS);
}
void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local,
dynamic_ps_enable_work);
struct ieee80211_sub_if_data *sdata = local->ps_sdata;
/* can only happen when PS was just disabled anyway */
if (!sdata)
return;
if (local->hw.conf.flags & IEEE80211_CONF_PS)
return;
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
ieee80211_send_nullfunc(local, sdata, 1);
local->hw.conf.flags |= IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
void ieee80211_dynamic_ps_timer(unsigned long data)
{
struct ieee80211_local *local = (void *) data;
if (local->quiescing || local->suspended)
return;
ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
}
/* MLME */
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
struct ieee80211_if_managed *ifmgd,
u8 *wmm_param, size_t wmm_param_len)
{
struct ieee80211_tx_queue_params params;
size_t left;
int count;
u8 *pos;
if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
return;
if (!wmm_param)
return;
if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
return;
count = wmm_param[6] & 0x0f;
if (count == ifmgd->wmm_last_param_set)
return;
ifmgd->wmm_last_param_set = count;
pos = wmm_param + 8;
left = wmm_param_len - 8;
memset(&params, 0, sizeof(params));
local->wmm_acm = 0;
for (; left >= 4; left -= 4, pos += 4) {
int aci = (pos[0] >> 5) & 0x03;
int acm = (pos[0] >> 4) & 0x01;
int queue;
switch (aci) {
case 1: /* AC_BK */
queue = 3;
if (acm)
local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
break;
case 2: /* AC_VI */
queue = 1;
if (acm)
local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
break;
case 3: /* AC_VO */
queue = 0;
if (acm)
local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
break;
case 0: /* AC_BE */
default:
queue = 2;
if (acm)
local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
break;
}
params.aifs = pos[0] & 0x0f;
params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
params.cw_min = ecw2cw(pos[1] & 0x0f);
params.txop = get_unaligned_le16(pos + 2);
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
"cWmin=%d cWmax=%d txop=%d\n",
wiphy_name(local->hw.wiphy), queue, aci, acm,
params.aifs, params.cw_min, params.cw_max, params.txop);
#endif
if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
printk(KERN_DEBUG "%s: failed to set TX queue "
"parameters for queue %d\n",
wiphy_name(local->hw.wiphy), queue);
}
}
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
u16 capab, bool erp_valid, u8 erp)
{
struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
u32 changed = 0;
bool use_protection;
bool use_short_preamble;
bool use_short_slot;
if (erp_valid) {
use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
} else {
use_protection = false;
use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
}
use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
if (use_protection != bss_conf->use_cts_prot) {
bss_conf->use_cts_prot = use_protection;
changed |= BSS_CHANGED_ERP_CTS_PROT;
}
if (use_short_preamble != bss_conf->use_short_preamble) {
bss_conf->use_short_preamble = use_short_preamble;
changed |= BSS_CHANGED_ERP_PREAMBLE;
}
if (use_short_slot != bss_conf->use_short_slot) {
bss_conf->use_short_slot = use_short_slot;
changed |= BSS_CHANGED_ERP_SLOT;
}
return changed;
}
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk,
u32 bss_info_changed)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_bss *bss = wk->bss;
bss_info_changed |= BSS_CHANGED_ASSOC;
/* set timing information */
sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
sdata->vif.bss_conf.dtim_period = bss->dtim_period;
bss_info_changed |= BSS_CHANGED_BEACON_INT;
bss_info_changed |= ieee80211_handle_bss_capability(sdata,
bss->cbss.capability, bss->has_erp_value, bss->erp_value);
sdata->u.mgd.associated = bss;
sdata->u.mgd.old_associate_work = wk;
memcpy(sdata->u.mgd.bssid, bss->cbss.bssid, ETH_ALEN);
/* just to be sure */
sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
IEEE80211_STA_BEACON_POLL);
ieee80211_led_assoc(local, 1);
sdata->vif.bss_conf.assoc = 1;
/*
* For now just always ask the driver to update the basic rateset
* when we have associated, we aren't checking whether it actually
* changed or not.
*/
bss_info_changed |= BSS_CHANGED_BASIC_RATES;
/* And the BSSID changed - we're associated now */
bss_info_changed |= BSS_CHANGED_BSSID;
ieee80211_bss_info_change_notify(sdata, bss_info_changed);
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
netif_start_queue(sdata->dev);
netif_carrier_on(sdata->dev);
}
static enum rx_mgmt_action __must_check
ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
wk->tries++;
if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
sdata->dev->name, wk->bss->cbss.bssid);
/*
* Most likely AP is not in the range so remove the
* bss struct for that AP.
*/
cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
/*
* We might have a pending scan which had no chance to run yet
* due to work needing to be done. Hence, queue the STAs work
* again for that.
*/
ieee80211_queue_work(&local->hw, &ifmgd->work);
return RX_MGMT_CFG80211_AUTH_TO;
}
printk(KERN_DEBUG "%s: direct probe to AP %pM (try %d)\n",
sdata->dev->name, wk->bss->cbss.bssid,
wk->tries);
/*
* Direct probe is sent to broadcast address as some APs
* will not answer to direct packet in unassociated state.
*/
ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
run_again(ifmgd, wk->timeout);
return RX_MGMT_NONE;
}
static enum rx_mgmt_action __must_check
ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
wk->tries++;
if (wk->tries > IEEE80211_AUTH_MAX_TRIES) {
printk(KERN_DEBUG "%s: authentication with AP %pM"
" timed out\n",
sdata->dev->name, wk->bss->cbss.bssid);
/*
* Most likely AP is not in the range so remove the
* bss struct for that AP.
*/
cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
/*
* We might have a pending scan which had no chance to run yet
* due to work needing to be done. Hence, queue the STAs work
* again for that.
*/
ieee80211_queue_work(&local->hw, &ifmgd->work);
return RX_MGMT_CFG80211_AUTH_TO;
}
printk(KERN_DEBUG "%s: authenticate with AP %pM (try %d)\n",
sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
ieee80211_send_auth(sdata, 1, wk->auth_alg, wk->ie, wk->ie_len,
wk->bss->cbss.bssid, NULL, 0, 0);
wk->auth_transaction = 2;
wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
run_again(ifmgd, wk->timeout);
return RX_MGMT_NONE;
}
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
bool deauth)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
u32 changed = 0, config_changed = 0;
u8 bssid[ETH_ALEN];
ASSERT_MGD_MTX(ifmgd);
if (WARN_ON(!ifmgd->associated))
return;
memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
ifmgd->associated = NULL;
memset(ifmgd->bssid, 0, ETH_ALEN);
if (deauth) {
kfree(ifmgd->old_associate_work);
ifmgd->old_associate_work = NULL;
} else {
struct ieee80211_mgd_work *wk = ifmgd->old_associate_work;
wk->state = IEEE80211_MGD_STATE_IDLE;
list_add(&wk->list, &ifmgd->work_list);
}
/*
* we need to commit the associated = NULL change because the
* scan code uses that to determine whether this iface should
* go to/wake up from powersave or not -- and could otherwise
* wake the queues erroneously.
*/
smp_mb();
/*
* Thus, we can only afterwards stop the queues -- to account
* for the case where another CPU is finishing a scan at this
* time -- we don't want the scan code to enable queues.
*/
netif_stop_queue(sdata->dev);
netif_carrier_off(sdata->dev);
rcu_read_lock();
sta = sta_info_get(local, bssid);
if (sta)
ieee80211_sta_tear_down_BA_sessions(sta);
rcu_read_unlock();
changed |= ieee80211_reset_erp_info(sdata);
ieee80211_led_assoc(local, 0);
changed |= BSS_CHANGED_ASSOC;
sdata->vif.bss_conf.assoc = false;
ieee80211_set_wmm_default(sdata);
ieee80211_recalc_idle(local);
/* channel(_type) changes are handled by ieee80211_hw_config */
local->oper_channel_type = NL80211_CHAN_NO_HT;
/* on the next assoc, re-program HT parameters */
sdata->ht_opmode_valid = false;
local->power_constr_level = 0;
del_timer_sync(&local->dynamic_ps_timer);
cancel_work_sync(&local->dynamic_ps_enable_work);
if (local->hw.conf.flags & IEEE80211_CONF_PS) {
local->hw.conf.flags &= ~IEEE80211_CONF_PS;
config_changed |= IEEE80211_CONF_CHANGE_PS;
}
ieee80211_hw_config(local, config_changed);
/* And the BSSID changed -- not very interesting here */
changed |= BSS_CHANGED_BSSID;
ieee80211_bss_info_change_notify(sdata, changed);
rcu_read_lock();
sta = sta_info_get(local, bssid);
if (!sta) {
rcu_read_unlock();
return;
}
sta_info_unlink(&sta);
rcu_read_unlock();
sta_info_destroy(sta);
}
static enum rx_mgmt_action __must_check
ieee80211_associate(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
wk->tries++;
if (wk->tries > IEEE80211_ASSOC_MAX_TRIES) {
printk(KERN_DEBUG "%s: association with AP %pM"
" timed out\n",
sdata->dev->name, wk->bss->cbss.bssid);
/*
* Most likely AP is not in the range so remove the
* bss struct for that AP.
*/
cfg80211_unlink_bss(local->hw.wiphy, &wk->bss->cbss);
/*
* We might have a pending scan which had no chance to run yet
* due to work needing to be done. Hence, queue the STAs work
* again for that.
*/
ieee80211_queue_work(&local->hw, &ifmgd->work);
return RX_MGMT_CFG80211_ASSOC_TO;
}
printk(KERN_DEBUG "%s: associate with AP %pM (try %d)\n",
sdata->dev->name, wk->bss->cbss.bssid, wk->tries);
ieee80211_send_assoc(sdata, wk);
wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
run_again(ifmgd, wk->timeout);
return RX_MGMT_NONE;
}
void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
struct ieee80211_hdr *hdr)
{
/*
* We can postpone the mgd.timer whenever receiving unicast frames
* from AP because we know that the connection is working both ways
* at that time. But multicast frames (and hence also beacons) must
* be ignored here, because we need to trigger the timer during
* data idle periods for sending the periodic probe request to the
* AP we're connected to.
*/
if (is_multicast_ether_addr(hdr->addr1))
return;
mod_timer(&sdata->u.mgd.conn_mon_timer,
round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
}
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *ssid;
ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
ssid + 2, ssid[1], NULL, 0);
ifmgd->probe_send_count++;
ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
run_again(ifmgd, ifmgd->probe_timeout);
}
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
bool beacon)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
bool already = false;
if (!netif_running(sdata->dev))
return;
if (sdata->local->scanning)
return;
mutex_lock(&ifmgd->mtx);
if (!ifmgd->associated)
goto out;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (beacon && net_ratelimit())
printk(KERN_DEBUG "%s: detected beacon loss from AP "
"- sending probe request\n", sdata->dev->name);
#endif
/*
* The driver/our work has already reported this event or the
* connection monitoring has kicked in and we have already sent
* a probe request. Or maybe the AP died and the driver keeps
* reporting until we disassociate...
*
* In either case we have to ignore the current call to this
* function (except for setting the correct probe reason bit)
* because otherwise we would reset the timer every time and
* never check whether we received a probe response!
*/
if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL))
already = true;
if (beacon)
ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
else
ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
if (already)
goto out;
mutex_lock(&sdata->local->iflist_mtx);
ieee80211_recalc_ps(sdata->local, -1);
mutex_unlock(&sdata->local->iflist_mtx);
ifmgd->probe_send_count = 0;
ieee80211_mgd_probe_ap_send(sdata);
out:
mutex_unlock(&ifmgd->mtx);
}
void ieee80211_beacon_loss_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data,
u.mgd.beacon_loss_work);
ieee80211_mgd_probe_ap(sdata, true);
}
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
}
EXPORT_SYMBOL(ieee80211_beacon_loss);
static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk)
{
wk->state = IEEE80211_MGD_STATE_IDLE;
printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
}
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk,
struct ieee80211_mgmt *mgmt,
size_t len)
{
u8 *pos;
struct ieee802_11_elems elems;
pos = mgmt->u.auth.variable;
ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
if (!elems.challenge)
return;
ieee80211_send_auth(sdata, 3, wk->auth_alg,
elems.challenge - 2, elems.challenge_len + 2,
wk->bss->cbss.bssid,
wk->key, wk->key_len, wk->key_idx);
wk->auth_transaction = 4;
}
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk,
struct ieee80211_mgmt *mgmt, size_t len)
{
u16 auth_alg, auth_transaction, status_code;
if (wk->state != IEEE80211_MGD_STATE_AUTH)
return RX_MGMT_NONE;
if (len < 24 + 6)
return RX_MGMT_NONE;
if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
return RX_MGMT_NONE;
if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
return RX_MGMT_NONE;
auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
status_code = le16_to_cpu(mgmt->u.auth.status_code);
if (auth_alg != wk->auth_alg ||
auth_transaction != wk->auth_transaction)
return RX_MGMT_NONE;
if (status_code != WLAN_STATUS_SUCCESS) {
list_del(&wk->list);
kfree(wk);
return RX_MGMT_CFG80211_AUTH;
}
switch (wk->auth_alg) {
case WLAN_AUTH_OPEN:
case WLAN_AUTH_LEAP:
case WLAN_AUTH_FT:
ieee80211_auth_completed(sdata, wk);
return RX_MGMT_CFG80211_AUTH;
case WLAN_AUTH_SHARED_KEY:
if (wk->auth_transaction == 4) {
ieee80211_auth_completed(sdata, wk);
return RX_MGMT_CFG80211_AUTH;
} else
ieee80211_auth_challenge(sdata, wk, mgmt, len);
break;
}
return RX_MGMT_NONE;
}
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *bssid = NULL;
u16 reason_code;
if (len < 24 + 2)
return RX_MGMT_NONE;
ASSERT_MGD_MTX(ifmgd);
if (wk)
bssid = wk->bss->cbss.bssid;
else
bssid = ifmgd->associated->cbss.bssid;
reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
sdata->dev->name, bssid, reason_code);
if (!wk) {
ieee80211_set_disassoc(sdata, true);
} else {
list_del(&wk->list);
kfree(wk);
}
return RX_MGMT_CFG80211_DEAUTH;
}
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt, size_t len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u16 reason_code;
if (len < 24 + 2)
return RX_MGMT_NONE;
ASSERT_MGD_MTX(ifmgd);
if (WARN_ON(!ifmgd->associated))
return RX_MGMT_NONE;
if (WARN_ON(memcmp(ifmgd->associated->cbss.bssid, mgmt->sa, ETH_ALEN)))
return RX_MGMT_NONE;
reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
sdata->dev->name, mgmt->sa, reason_code);
ieee80211_set_disassoc(sdata, false);
return RX_MGMT_CFG80211_DISASSOC;
}
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk,
struct ieee80211_mgmt *mgmt, size_t len,
bool reassoc)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct ieee80211_supported_band *sband;
struct sta_info *sta;
u32 rates, basic_rates;
u16 capab_info, status_code, aid;
struct ieee802_11_elems elems;
struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
u8 *pos;
u32 changed = 0;
int i, j;
bool have_higher_than_11mbit = false, newsta = false;
u16 ap_ht_cap_flags;
/*
* AssocResp and ReassocResp have identical structure, so process both
* of them in this function.
*/
if (len < 24 + 6)
return RX_MGMT_NONE;
if (memcmp(wk->bss->cbss.bssid, mgmt->sa, ETH_ALEN) != 0)
return RX_MGMT_NONE;
capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
"status=%d aid=%d)\n",
sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
pos = mgmt->u.assoc_resp.variable;
ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
elems.timeout_int && elems.timeout_int_len == 5 &&
elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
u32 tu, ms;
tu = get_unaligned_le32(elems.timeout_int + 1);
ms = tu * 1024 / 1000;
printk(KERN_DEBUG "%s: AP rejected association temporarily; "
"comeback duration %u TU (%u ms)\n",
sdata->dev->name, tu, ms);
wk->timeout = jiffies + msecs_to_jiffies(ms);
if (ms > IEEE80211_ASSOC_TIMEOUT)
run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
return RX_MGMT_NONE;
}
if (status_code != WLAN_STATUS_SUCCESS) {
printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
sdata->dev->name, status_code);
wk->state = IEEE80211_MGD_STATE_IDLE;
return RX_MGMT_CFG80211_ASSOC;
}
if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
"set\n", sdata->dev->name, aid);
aid &= ~(BIT(15) | BIT(14));
if (!elems.supp_rates) {
printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
sdata->dev->name);
return RX_MGMT_NONE;
}
printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
ifmgd->aid = aid;
rcu_read_lock();
/* Add STA entry for the AP */
sta = sta_info_get(local, wk->bss->cbss.bssid);
if (!sta) {
newsta = true;
rcu_read_unlock();
sta = sta_info_alloc(sdata, wk->bss->cbss.bssid, GFP_KERNEL);
if (!sta) {
printk(KERN_DEBUG "%s: failed to alloc STA entry for"
" the AP\n", sdata->dev->name);
return RX_MGMT_NONE;
}
set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
WLAN_STA_ASSOC_AP);
if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
set_sta_flags(sta, WLAN_STA_AUTHORIZED);
rcu_read_lock();
}
rates = 0;
basic_rates = 0;
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
for (i = 0; i < elems.supp_rates_len; i++) {
int rate = (elems.supp_rates[i] & 0x7f) * 5;
bool is_basic = !!(elems.supp_rates[i] & 0x80);
if (rate > 110)
have_higher_than_11mbit = true;
for (j = 0; j < sband->n_bitrates; j++) {
if (sband->bitrates[j].bitrate == rate) {
rates |= BIT(j);
if (is_basic)
basic_rates |= BIT(j);
break;
}
}
}
for (i = 0; i < elems.ext_supp_rates_len; i++) {
int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
if (rate > 110)
have_higher_than_11mbit = true;
for (j = 0; j < sband->n_bitrates; j++) {
if (sband->bitrates[j].bitrate == rate) {
rates |= BIT(j);
if (is_basic)
basic_rates |= BIT(j);
break;
}
}
}
sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
sdata->vif.bss_conf.basic_rates = basic_rates;
/* cf. IEEE 802.11 9.2.12 */
if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
have_higher_than_11mbit)
sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
else
sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
elems.ht_cap_elem, &sta->sta.ht_cap);
ap_ht_cap_flags = sta->sta.ht_cap.cap;
rate_control_rate_init(sta);
if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
set_sta_flags(sta, WLAN_STA_MFP);
if (elems.wmm_param)
set_sta_flags(sta, WLAN_STA_WME);
if (newsta) {
int err = sta_info_insert(sta);
if (err) {
printk(KERN_DEBUG "%s: failed to insert STA entry for"
" the AP (error %d)\n", sdata->dev->name, err);
rcu_read_unlock();
return RX_MGMT_NONE;
}
}
rcu_read_unlock();
if (elems.wmm_param)
ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
elems.wmm_param_len);
else
ieee80211_set_wmm_default(sdata);
if (elems.ht_info_elem && elems.wmm_param &&
(ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
wk->bss->cbss.bssid,
ap_ht_cap_flags);
/* delete work item -- must be before set_associated for PS */
list_del(&wk->list);
/* set AID and assoc capability,
* ieee80211_set_associated() will tell the driver */
bss_conf->aid = aid;
bss_conf->assoc_capability = capab_info;
/* this will take ownership of wk */
ieee80211_set_associated(sdata, wk, changed);
/*
* Start timer to probe the connection to the AP now.
* Also start the timer that will detect beacon loss.
*/
ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
mod_beacon_timer(sdata);
return RX_MGMT_CFG80211_ASSOC;
}
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee80211_rx_status *rx_status,
struct ieee802_11_elems *elems,
bool beacon)
{
struct ieee80211_local *local = sdata->local;
int freq;
struct ieee80211_bss *bss;
struct ieee80211_channel *channel;
if (elems->ds_params && elems->ds_params_len == 1)
freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
else
freq = rx_status->freq;
channel = ieee80211_get_channel(local->hw.wiphy, freq);
if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
return;
bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
channel, beacon);
if (bss)
ieee80211_rx_bss_put(local, bss);
if (!sdata->u.mgd.associated)
return;
if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
(memcmp(mgmt->bssid, sdata->u.mgd.associated->cbss.bssid,
ETH_ALEN) == 0)) {
struct ieee80211_channel_sw_ie *sw_elem =
(struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
}
}
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_work *wk,
struct ieee80211_mgmt *mgmt, size_t len,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_if_managed *ifmgd;
size_t baselen;
struct ieee802_11_elems elems;
ifmgd = &sdata->u.mgd;
ASSERT_MGD_MTX(ifmgd);
if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
return; /* ignore ProbeResp to foreign address */
baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
if (baselen > len)
return;
ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
&elems);
ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
/* direct probe may be part of the association flow */
if (wk && wk->state == IEEE80211_MGD_STATE_PROBE) {
printk(KERN_DEBUG "%s: direct probe responded\n",
sdata->dev->name);
wk->tries = 0;
wk->state = IEEE80211_MGD_STATE_AUTH;
WARN_ON(ieee80211_authenticate(sdata, wk) != RX_MGMT_NONE);
}
if (ifmgd->associated &&
memcmp(mgmt->bssid, ifmgd->associated->cbss.bssid, ETH_ALEN) == 0 &&
ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL)) {
ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
IEEE80211_STA_BEACON_POLL);
mutex_lock(&sdata->local->iflist_mtx);
ieee80211_recalc_ps(sdata->local, -1);
mutex_unlock(&sdata->local->iflist_mtx);
/*
* We've received a probe response, but are not sure whether
* we have or will be receiving any beacons or data, so let's
* schedule the timers again, just in case.
*/
mod_beacon_timer(sdata);
mod_timer(&ifmgd->conn_mon_timer,
round_jiffies_up(jiffies +
IEEE80211_CONNECTION_IDLE_TIME));
}
}
/*
* This is the canonical list of information elements we care about,
* the filter code also gives us all changes to the Microsoft OUI
* (00:50:F2) vendor IE which is used for WMM which we need to track.
*
* We implement beacon filtering in software since that means we can
* avoid processing the frame here and in cfg80211, and userspace
* will not be able to tell whether the hardware supports it or not.
*
* XXX: This list needs to be dynamic -- userspace needs to be able to
* add items it requires. It also needs to be able to tell us to
* look out for other vendor IEs.
*/
static const u64 care_about_ies =
(1ULL << WLAN_EID_COUNTRY) |
(1ULL << WLAN_EID_ERP_INFO) |
(1ULL << WLAN_EID_CHANNEL_SWITCH) |
(1ULL << WLAN_EID_PWR_CONSTRAINT) |
(1ULL << WLAN_EID_HT_CAPABILITY) |
(1ULL << WLAN_EID_HT_INFORMATION);
static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
size_t baselen;
struct ieee802_11_elems elems;
struct ieee80211_local *local = sdata->local;
u32 changed = 0;
bool erp_valid, directed_tim = false;
u8 erp_value = 0;
u32 ncrc;
u8 *bssid;
ASSERT_MGD_MTX(ifmgd);
/* Process beacon from the current BSS */
baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
if (baselen > len)
return;
if (rx_status->freq != local->hw.conf.channel->center_freq)
return;
/*
* We might have received a number of frames, among them a
* disassoc frame and a beacon...
*/
if (!ifmgd->associated)
return;
bssid = ifmgd->associated->cbss.bssid;
/*
* And in theory even frames from a different AP we were just
* associated to a split-second ago!
*/
if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
return;
if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: cancelling probereq poll due "
"to a received beacon\n", sdata->dev->name);
}
#endif
ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
}
/*
* Push the beacon loss detection into the future since
* we are processing a beacon from the AP just now.
*/
mod_beacon_timer(sdata);
ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
len - baselen, &elems,
care_about_ies, ncrc);
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
ifmgd->aid);
if (ncrc != ifmgd->beacon_crc) {
ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
true);
ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
elems.wmm_param_len);
}
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
if (directed_tim) {
if (local->hw.conf.dynamic_ps_timeout > 0) {
local->hw.conf.flags &= ~IEEE80211_CONF_PS;
ieee80211_hw_config(local,
IEEE80211_CONF_CHANGE_PS);
ieee80211_send_nullfunc(local, sdata, 0);
} else {
local->pspolling = true;
/*
* Here is assumed that the driver will be
* able to send ps-poll frame and receive a
* response even though power save mode is
* enabled, but some drivers might require
* to disable power save here. This needs
* to be investigated.
*/
ieee80211_send_pspoll(local, sdata);
}
}
}
if (ncrc == ifmgd->beacon_crc)
return;
ifmgd->beacon_crc = ncrc;
if (elems.erp_info && elems.erp_info_len >= 1) {
erp_valid = true;
erp_value = elems.erp_info[0];
} else {
erp_valid = false;
}
changed |= ieee80211_handle_bss_capability(sdata,
le16_to_cpu(mgmt->u.beacon.capab_info),
erp_valid, erp_value);
if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
struct sta_info *sta;
struct ieee80211_supported_band *sband;
u16 ap_ht_cap_flags;
rcu_read_lock();
sta = sta_info_get(local, bssid);
if (WARN_ON(!sta)) {
rcu_read_unlock();
return;
}
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
elems.ht_cap_elem, &sta->sta.ht_cap);
ap_ht_cap_flags = sta->sta.ht_cap.cap;
rcu_read_unlock();
changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
bssid, ap_ht_cap_flags);
}
/* Note: country IE parsing is done for us by cfg80211 */
if (elems.country_elem) {
/* TODO: IBSS also needs this */
if (elems.pwr_constr_elem)
ieee80211_handle_pwr_constr(sdata,
le16_to_cpu(mgmt->u.probe_resp.capab_info),
elems.pwr_constr_elem,
elems.pwr_constr_elem_len);
}
ieee80211_bss_info_change_notify(sdata, changed);
}
ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_mgmt *mgmt;
u16 fc;
if (skb->len < 24)
return RX_DROP_MONITOR;
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = le16_to_cpu(mgmt->frame_control);
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_PROBE_REQ:
case IEEE80211_STYPE_PROBE_RESP:
case IEEE80211_STYPE_BEACON:
case IEEE80211_STYPE_AUTH:
case IEEE80211_STYPE_ASSOC_RESP:
case IEEE80211_STYPE_REASSOC_RESP:
case IEEE80211_STYPE_DEAUTH:
case IEEE80211_STYPE_DISASSOC:
case IEEE80211_STYPE_ACTION:
skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
return RX_QUEUED;
}
return RX_DROP_MONITOR;
}
static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_rx_status *rx_status;
struct ieee80211_mgmt *mgmt;
struct ieee80211_mgd_work *wk;
enum rx_mgmt_action rma = RX_MGMT_NONE;
u16 fc;
rx_status = (struct ieee80211_rx_status *) skb->cb;
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = le16_to_cpu(mgmt->frame_control);
mutex_lock(&ifmgd->mtx);
if (ifmgd->associated &&
memcmp(ifmgd->associated->cbss.bssid, mgmt->bssid,
ETH_ALEN) == 0) {
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_BEACON:
ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
rx_status);
break;
case IEEE80211_STYPE_PROBE_RESP:
ieee80211_rx_mgmt_probe_resp(sdata, NULL, mgmt,
skb->len, rx_status);
break;
case IEEE80211_STYPE_DEAUTH:
rma = ieee80211_rx_mgmt_deauth(sdata, NULL,
mgmt, skb->len);
break;
case IEEE80211_STYPE_DISASSOC:
rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
break;
case IEEE80211_STYPE_ACTION:
/* XXX: differentiate, can only happen for CSA now! */
ieee80211_sta_process_chanswitch(sdata,
&mgmt->u.action.u.chan_switch.sw_elem,
ifmgd->associated);
break;
}
mutex_unlock(&ifmgd->mtx);
switch (rma) {
case RX_MGMT_NONE:
/* no action */
break;
case RX_MGMT_CFG80211_DEAUTH:
cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
break;
case RX_MGMT_CFG80211_DISASSOC:
cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
break;
default:
WARN(1, "unexpected: %d", rma);
}
goto out;
}
list_for_each_entry(wk, &ifmgd->work_list, list) {
if (memcmp(wk->bss->cbss.bssid, mgmt->bssid, ETH_ALEN) != 0)
continue;
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_PROBE_RESP:
ieee80211_rx_mgmt_probe_resp(sdata, wk, mgmt, skb->len,
rx_status);
break;
case IEEE80211_STYPE_AUTH:
rma = ieee80211_rx_mgmt_auth(sdata, wk, mgmt, skb->len);
break;
case IEEE80211_STYPE_ASSOC_RESP:
rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
skb->len, false);
break;
case IEEE80211_STYPE_REASSOC_RESP:
rma = ieee80211_rx_mgmt_assoc_resp(sdata, wk, mgmt,
skb->len, true);
break;
case IEEE80211_STYPE_DEAUTH:
rma = ieee80211_rx_mgmt_deauth(sdata, wk, mgmt,
skb->len);
break;
}
/*
* We've processed this frame for that work, so it can't
* belong to another work struct.
* NB: this is also required for correctness because the
* called functions can free 'wk', and for 'rma'!
*/
break;
}
mutex_unlock(&ifmgd->mtx);
switch (rma) {
case RX_MGMT_NONE:
/* no action */
break;
case RX_MGMT_CFG80211_AUTH:
cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, skb->len);
break;
case RX_MGMT_CFG80211_ASSOC:
cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len);
break;
case RX_MGMT_CFG80211_DEAUTH:
cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
break;
default:
WARN(1, "unexpected: %d", rma);
}
out:
kfree_skb(skb);
}
static void ieee80211_sta_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
if (local->quiescing) {
set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
return;
}
ieee80211_queue_work(&local->hw, &ifmgd->work);
}
static void ieee80211_sta_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd;
struct sk_buff *skb;
struct ieee80211_mgd_work *wk, *tmp;
LIST_HEAD(free_work);
enum rx_mgmt_action rma;
bool anybusy = false;
if (!netif_running(sdata->dev))
return;
if (local->scanning)
return;
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
return;
/*
* ieee80211_queue_work() should have picked up most cases,
* here we'll pick the the rest.
*/
if (WARN(local->suspended, "STA MLME work scheduled while "
"going to suspend\n"))
return;
ifmgd = &sdata->u.mgd;
/* first process frames to avoid timing out while a frame is pending */
while ((skb = skb_dequeue(&ifmgd->skb_queue)))
ieee80211_sta_rx_queued_mgmt(sdata, skb);
/* then process the rest of the work */
mutex_lock(&ifmgd->mtx);
if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL) &&
ifmgd->associated) {
u8 bssid[ETH_ALEN];
memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
if (time_is_after_jiffies(ifmgd->probe_timeout))
run_again(ifmgd, ifmgd->probe_timeout);
else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "No probe response from AP %pM"
" after %dms, try %d\n", bssid,
(1000 * IEEE80211_PROBE_WAIT)/HZ,
ifmgd->probe_send_count);
#endif
ieee80211_mgd_probe_ap_send(sdata);
} else {
/*
* We actually lost the connection ... or did we?
* Let's make sure!
*/
ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
IEEE80211_STA_BEACON_POLL);
printk(KERN_DEBUG "No probe response from AP %pM"
" after %dms, disconnecting.\n",
bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
ieee80211_set_disassoc(sdata, true);
mutex_unlock(&ifmgd->mtx);
/*
* must be outside lock due to cfg80211,
* but that's not a problem.
*/
ieee80211_send_deauth_disassoc(sdata, bssid,
IEEE80211_STYPE_DEAUTH,
WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
NULL);
mutex_lock(&ifmgd->mtx);
}
}
ieee80211_recalc_idle(local);
list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
if (time_is_after_jiffies(wk->timeout)) {
/*
* This work item isn't supposed to be worked on
* right now, but take care to adjust the timer
* properly.
*/
run_again(ifmgd, wk->timeout);
continue;
}
switch (wk->state) {
default:
WARN_ON(1);
/* fall through */
case IEEE80211_MGD_STATE_IDLE:
/* nothing */
rma = RX_MGMT_NONE;
break;
case IEEE80211_MGD_STATE_PROBE:
rma = ieee80211_direct_probe(sdata, wk);
break;
case IEEE80211_MGD_STATE_AUTH:
rma = ieee80211_authenticate(sdata, wk);
break;
case IEEE80211_MGD_STATE_ASSOC:
rma = ieee80211_associate(sdata, wk);
break;
}
switch (rma) {
case RX_MGMT_NONE:
/* no action required */
break;
case RX_MGMT_CFG80211_AUTH_TO:
case RX_MGMT_CFG80211_ASSOC_TO:
list_del(&wk->list);
list_add(&wk->list, &free_work);
wk->tries = rma; /* small abuse but only local */
break;
default:
WARN(1, "unexpected: %d", rma);
}
}
list_for_each_entry(wk, &ifmgd->work_list, list) {
if (wk->state != IEEE80211_MGD_STATE_IDLE) {
anybusy = true;
break;
}
}
if (!anybusy &&
test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request))
ieee80211_queue_delayed_work(&local->hw,
&local->scan_work,
round_jiffies_relative(0));
mutex_unlock(&ifmgd->mtx);
list_for_each_entry_safe(wk, tmp, &free_work, list) {
switch (wk->tries) {
case RX_MGMT_CFG80211_AUTH_TO:
cfg80211_send_auth_timeout(sdata->dev,
wk->bss->cbss.bssid);
break;
case RX_MGMT_CFG80211_ASSOC_TO:
cfg80211_send_assoc_timeout(sdata->dev,
wk->bss->cbss.bssid);
break;
default:
WARN(1, "unexpected: %d", wk->tries);
}
list_del(&wk->list);
kfree(wk);
}
ieee80211_recalc_idle(local);
}
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
struct ieee80211_local *local = sdata->local;
if (local->quiescing)
return;
ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
}
static void ieee80211_sta_conn_mon_timer(unsigned long data)
{
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
if (local->quiescing)
return;
ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
}
static void ieee80211_sta_monitor_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
container_of(work, struct ieee80211_sub_if_data,
u.mgd.monitor_work);
ieee80211_mgd_probe_ap(sdata, false);
}
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL);
/* let's probe the connection once */
ieee80211_queue_work(&sdata->local->hw,
&sdata->u.mgd.monitor_work);
/* and do all the other regular work too */
ieee80211_queue_work(&sdata->local->hw,
&sdata->u.mgd.work);
}
}
#ifdef CONFIG_PM
void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
/*
* we need to use atomic bitops for the running bits
* only because both timers might fire at the same
* time -- the code here is properly synchronised.
*/
cancel_work_sync(&ifmgd->work);
cancel_work_sync(&ifmgd->beacon_loss_work);
if (del_timer_sync(&ifmgd->timer))
set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
cancel_work_sync(&ifmgd->chswitch_work);
if (del_timer_sync(&ifmgd->chswitch_timer))
set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
cancel_work_sync(&ifmgd->monitor_work);
/* these will just be re-established on connection */
del_timer_sync(&ifmgd->conn_mon_timer);
del_timer_sync(&ifmgd->bcn_mon_timer);
}
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
add_timer(&ifmgd->timer);
if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
add_timer(&ifmgd->chswitch_timer);
}
#endif
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd;
ifmgd = &sdata->u.mgd;
INIT_WORK(&ifmgd->work, ieee80211_sta_work);
INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
setup_timer(&ifmgd->timer, ieee80211_sta_timer,
(unsigned long) sdata);
setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
(unsigned long) sdata);
setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
(unsigned long) sdata);
setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
(unsigned long) sdata);
skb_queue_head_init(&ifmgd->skb_queue);
INIT_LIST_HEAD(&ifmgd->work_list);
ifmgd->capab = WLAN_CAPABILITY_ESS;
ifmgd->flags = 0;
if (sdata->local->hw.queues >= 4)
ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
mutex_init(&ifmgd->mtx);
}
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata = local->scan_sdata;
/* Restart STA timers */
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list)
ieee80211_restart_sta_timer(sdata);
rcu_read_unlock();
}
int ieee80211_max_network_latency(struct notifier_block *nb,
unsigned long data, void *dummy)
{
s32 latency_usec = (s32) data;
struct ieee80211_local *local =
container_of(nb, struct ieee80211_local,
network_latency_notifier);
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, latency_usec);
mutex_unlock(&local->iflist_mtx);
return 0;
}
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
struct cfg80211_auth_request *req)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *ssid;
struct ieee80211_mgd_work *wk;
u16 auth_alg;
switch (req->auth_type) {
case NL80211_AUTHTYPE_OPEN_SYSTEM:
auth_alg = WLAN_AUTH_OPEN;
break;
case NL80211_AUTHTYPE_SHARED_KEY:
auth_alg = WLAN_AUTH_SHARED_KEY;
break;
case NL80211_AUTHTYPE_FT:
auth_alg = WLAN_AUTH_FT;
break;
case NL80211_AUTHTYPE_NETWORK_EAP:
auth_alg = WLAN_AUTH_LEAP;
break;
default:
return -EOPNOTSUPP;
}
wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
if (!wk)
return -ENOMEM;
wk->bss = (void *)req->bss;
if (req->ie && req->ie_len) {
memcpy(wk->ie, req->ie, req->ie_len);
wk->ie_len = req->ie_len;
}
if (req->key && req->key_len) {
wk->key_len = req->key_len;
wk->key_idx = req->key_idx;
memcpy(wk->key, req->key, req->key_len);
}
ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
memcpy(wk->ssid, ssid + 2, ssid[1]);
wk->ssid_len = ssid[1];
wk->state = IEEE80211_MGD_STATE_PROBE;
wk->auth_alg = auth_alg;
wk->timeout = jiffies; /* run right away */
/*
* XXX: if still associated need to tell AP that we're going
* to sleep and then change channel etc.
*/
sdata->local->oper_channel = req->bss->channel;
ieee80211_hw_config(sdata->local, 0);
mutex_lock(&ifmgd->mtx);
list_add(&wk->list, &sdata->u.mgd.work_list);
mutex_unlock(&ifmgd->mtx);
ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
return 0;
}
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
struct cfg80211_assoc_request *req)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_mgd_work *wk, *found = NULL;
int i, err;
mutex_lock(&ifmgd->mtx);
list_for_each_entry(wk, &ifmgd->work_list, list) {
if (&wk->bss->cbss == req->bss &&
wk->state == IEEE80211_MGD_STATE_IDLE) {
found = wk;
break;
}
}
if (!found) {
err = -ENOLINK;
goto out;
}
list_del(&found->list);
wk = krealloc(found, sizeof(*wk) + req->ie_len, GFP_KERNEL);
if (!wk) {
list_add(&found->list, &ifmgd->work_list);
err = -ENOMEM;
goto out;
}
list_add(&wk->list, &ifmgd->work_list);
ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
sdata->local->oper_channel = req->bss->channel;
ieee80211_hw_config(sdata->local, 0);
if (req->ie && req->ie_len) {
memcpy(wk->ie, req->ie, req->ie_len);
wk->ie_len = req->ie_len;
} else
wk->ie_len = 0;
if (req->prev_bssid)
memcpy(wk->prev_bssid, req->prev_bssid, ETH_ALEN);
wk->state = IEEE80211_MGD_STATE_ASSOC;
wk->tries = 0;
wk->timeout = jiffies; /* run right away */
if (req->use_mfp) {
ifmgd->mfp = IEEE80211_MFP_REQUIRED;
ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
} else {
ifmgd->mfp = IEEE80211_MFP_DISABLED;
ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
}
if (req->crypto.control_port)
ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
else
ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.work);
err = 0;
out:
mutex_unlock(&ifmgd->mtx);
return err;
}
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
struct cfg80211_deauth_request *req,
void *cookie)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_mgd_work *wk;
const u8 *bssid = NULL;
mutex_lock(&ifmgd->mtx);
if (ifmgd->associated && &ifmgd->associated->cbss == req->bss) {
bssid = req->bss->bssid;
ieee80211_set_disassoc(sdata, true);
} else list_for_each_entry(wk, &ifmgd->work_list, list) {
if (&wk->bss->cbss == req->bss) {
bssid = req->bss->bssid;
list_del(&wk->list);
kfree(wk);
break;
}
}
/*
* cfg80211 should catch this ... but it's racy since
* we can receive a deauth frame, process it, hand it
* to cfg80211 while that's in a locked section already
* trying to tell us that the user wants to disconnect.
*/
if (!bssid) {
mutex_unlock(&ifmgd->mtx);
return -ENOLINK;
}
mutex_unlock(&ifmgd->mtx);
printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
sdata->dev->name, bssid, req->reason_code);
ieee80211_send_deauth_disassoc(sdata, bssid,
IEEE80211_STYPE_DEAUTH, req->reason_code,
cookie);
return 0;
}
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
struct cfg80211_disassoc_request *req,
void *cookie)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
mutex_lock(&ifmgd->mtx);
/*
* cfg80211 should catch this ... but it's racy since
* we can receive a disassoc frame, process it, hand it
* to cfg80211 while that's in a locked section already
* trying to tell us that the user wants to disconnect.
*/
if (&ifmgd->associated->cbss != req->bss) {
mutex_unlock(&ifmgd->mtx);
return -ENOLINK;
}
printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
sdata->dev->name, req->bss->bssid, req->reason_code);
ieee80211_set_disassoc(sdata, false);
mutex_unlock(&ifmgd->mtx);
ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
IEEE80211_STYPE_DISASSOC, req->reason_code,
cookie);
return 0;
}
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