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kernel-fxtec-pro1x/net/mac80211/mlme.c
Johannes Berg f1d58c2521 mac80211: push rx status into skb->cb 
Within mac80211, we often need to copy the rx status into
skb->cb. This is wasteful, as drivers could be building it
in there to start with. This patch changes the API so that
drivers are expected to pass the RX status in skb->cb, now
accessible as IEEE80211_SKB_RXCB(skb). It also updates all
drivers to pass the rx status in there, but only by making
them memcpy() it into place before the call to the receive
function (ieee80211_rx(_irqsafe)). Each driver can now be
optimised on its own schedule.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-07-10 14:57:54 -04:00

2602 lines
72 KiB
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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_ASSOC_SCANS_MAX_TRIES 2
#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_MONITORING_INTERVAL (2 * HZ)
#define IEEE80211_PROBE_WAIT (HZ / 5)
#define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
#define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
#define TMR_RUNNING_TIMER 0
#define TMR_RUNNING_CHANSW 1
/* utils */
static int ecw2cw(int ecw)
{
return (1 << ecw) - 1;
}
static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
{
u8 *end, *pos;
pos = bss->cbss.information_elements;
if (pos == NULL)
return NULL;
end = pos + bss->cbss.len_information_elements;
while (pos + 1 < end) {
if (pos + 2 + pos[1] > end)
break;
if (pos[0] == ie)
return pos;
pos += 2 + pos[1];
}
return NULL;
}
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,
u16 ap_ht_cap_flags)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_supported_band *sband;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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, ifmgd->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_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
u8 *pos, *ies, *ht_ie;
int i, len, count, rates_len, supp_rates_len;
u16 capab;
struct ieee80211_bss *bss;
int wmm = 0;
struct ieee80211_supported_band *sband;
u32 rates = 0;
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
ifmgd->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;
}
bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
local->hw.conf.channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
if (bss) {
if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
capab |= WLAN_CAPABILITY_PRIVACY;
if (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(bss, sband, &rates);
if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
(local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
ieee80211_rx_bss_put(local, bss);
} else {
rates = ~0;
rates_len = sband->n_bitrates;
}
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(mgmt, 0, 24);
memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
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, ifmgd->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 + ifmgd->ssid_len);
*pos++ = WLAN_EID_SSID;
*pos++ = ifmgd->ssid_len;
memcpy(pos, ifmgd->ssid, ifmgd->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 (ifmgd->extra_ie) {
pos = skb_put(skb, ifmgd->extra_ie_len);
memcpy(pos, ifmgd->extra_ie, ifmgd->extra_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(bss, WLAN_EID_HT_INFORMATION)) &&
ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
(!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
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));
}
kfree(ifmgd->assocreq_ies);
ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
if (ifmgd->assocreq_ies)
memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
ieee80211_tx_skb(sdata, skb, 0);
}
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
u16 stype, u16 reason)
{
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, ifmgd->bssid, ETH_ALEN);
memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
memcpy(mgmt->bssid, ifmgd->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)
cfg80211_send_deauth(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_bss *bss;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (!netif_running(sdata->dev))
return;
bss = ieee80211_rx_bss_get(sdata->local, ifmgd->bssid,
sdata->local->hw.conf.channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
if (!bss)
goto exit;
sdata->local->oper_channel = sdata->local->csa_channel;
/* XXX: shouldn't really modify cfg80211-owned data! */
if (!ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL))
bss->cbss.channel = sdata->local->oper_channel;
ieee80211_rx_bss_put(sdata->local, bss);
exit:
ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
ieee80211_wake_queues_by_reason(&sdata->local->hw,
IEEE80211_QUEUE_STOP_REASON_CSA);
}
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;
}
queue_work(sdata->local->hw.workqueue, &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);
if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATED)
return;
if (sdata->local->sw_scanning || sdata->local->hw_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) {
queue_work(sdata->local->hw.workqueue, &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->hw_scanning || local->sw_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.flags & IEEE80211_STA_ASSOCIATED) &&
!(found->u.mgd.flags & IEEE80211_STA_PROBEREQ_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)
return;
queue_work(local->hw.workqueue, &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;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
#endif
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) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
sdata->dev->name,
use_protection ? "enabled" : "disabled",
ifmgd->bssid);
}
#endif
bss_conf->use_cts_prot = use_protection;
changed |= BSS_CHANGED_ERP_CTS_PROT;
}
if (use_short_preamble != bss_conf->use_short_preamble) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: switched to %s barker preamble"
" (BSSID=%pM)\n",
sdata->dev->name,
use_short_preamble ? "short" : "long",
ifmgd->bssid);
}
#endif
bss_conf->use_short_preamble = use_short_preamble;
changed |= BSS_CHANGED_ERP_PREAMBLE;
}
if (use_short_slot != bss_conf->use_short_slot) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: switched to %s slot time"
" (BSSID=%pM)\n",
sdata->dev->name,
use_short_slot ? "short" : "long",
ifmgd->bssid);
}
#endif
bss_conf->use_short_slot = use_short_slot;
changed |= BSS_CHANGED_ERP_SLOT;
}
return changed;
}
static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
{
union iwreq_data wrqu;
memset(&wrqu, 0, sizeof(wrqu));
if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
}
static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
char *buf;
size_t len;
int i;
union iwreq_data wrqu;
if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
return;
buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
ifmgd->assocresp_ies_len), GFP_KERNEL);
if (!buf)
return;
len = sprintf(buf, "ASSOCINFO(");
if (ifmgd->assocreq_ies) {
len += sprintf(buf + len, "ReqIEs=");
for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
len += sprintf(buf + len, "%02x",
ifmgd->assocreq_ies[i]);
}
}
if (ifmgd->assocresp_ies) {
if (ifmgd->assocreq_ies)
len += sprintf(buf + len, " ");
len += sprintf(buf + len, "RespIEs=");
for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
len += sprintf(buf + len, "%02x",
ifmgd->assocresp_ies[i]);
}
}
len += sprintf(buf + len, ")");
if (len > IW_CUSTOM_MAX) {
len = sprintf(buf, "ASSOCRESPIE=");
for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
len += sprintf(buf + len, "%02x",
ifmgd->assocresp_ies[i]);
}
}
if (len <= IW_CUSTOM_MAX) {
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = len;
wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
}
kfree(buf);
}
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
u32 bss_info_changed)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct ieee80211_conf *conf = &local_to_hw(local)->conf;
struct ieee80211_bss *bss;
bss_info_changed |= BSS_CHANGED_ASSOC;
ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
conf->channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
if (bss) {
/* 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);
cfg80211_hold_bss(&bss->cbss);
ieee80211_rx_bss_put(local, bss);
}
ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
ieee80211_sta_send_associnfo(sdata);
ifmgd->last_probe = jiffies;
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);
/* will be same as sdata */
if (local->ps_sdata) {
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
}
netif_tx_start_all_queues(sdata->dev);
netif_carrier_on(sdata->dev);
ieee80211_sta_send_apinfo(sdata);
}
static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
ifmgd->direct_probe_tries++;
if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
sdata->dev->name, ifmgd->bssid);
ifmgd->state = IEEE80211_STA_MLME_DISABLED;
ieee80211_recalc_idle(local);
cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
/*
* Most likely AP is not in the range so remove the
* bss information associated to the AP
*/
ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
sdata->local->hw.conf.channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
/*
* We might have a pending scan which had no chance to run yet
* due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
* Hence, queue the STAs work again
*/
queue_work(local->hw.workqueue, &ifmgd->work);
return;
}
printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
sdata->dev->name, ifmgd->bssid,
ifmgd->direct_probe_tries);
ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
/* 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,
ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
}
static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
u8 *ies;
size_t ies_len;
ifmgd->auth_tries++;
if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
printk(KERN_DEBUG "%s: authentication with AP %pM"
" timed out\n",
sdata->dev->name, ifmgd->bssid);
ifmgd->state = IEEE80211_STA_MLME_DISABLED;
ieee80211_recalc_idle(local);
cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
sdata->local->hw.conf.channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
/*
* We might have a pending scan which had no chance to run yet
* due to state == IEEE80211_STA_MLME_AUTHENTICATE.
* Hence, queue the STAs work again
*/
queue_work(local->hw.workqueue, &ifmgd->work);
return;
}
ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
sdata->dev->name, ifmgd->bssid);
if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
ies = ifmgd->sme_auth_ie;
ies_len = ifmgd->sme_auth_ie_len;
} else {
ies = NULL;
ies_len = 0;
}
ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
ifmgd->bssid, 0);
ifmgd->auth_transaction = 2;
mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
}
/*
* The disassoc 'reason' argument can be either our own reason
* if self disconnected or a reason code from the AP.
*/
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
bool deauth, bool self_disconnected,
u16 reason)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct ieee80211_conf *conf = &local_to_hw(local)->conf;
struct ieee80211_bss *bss;
struct sta_info *sta;
u32 changed = 0, config_changed = 0;
if (deauth) {
ifmgd->direct_probe_tries = 0;
ifmgd->auth_tries = 0;
}
ifmgd->assoc_scan_tries = 0;
ifmgd->assoc_tries = 0;
netif_tx_stop_all_queues(sdata->dev);
netif_carrier_off(sdata->dev);
rcu_read_lock();
sta = sta_info_get(local, ifmgd->bssid);
if (sta)
ieee80211_sta_tear_down_BA_sessions(sta);
rcu_read_unlock();
bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
conf->channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
if (bss) {
cfg80211_unhold_bss(&bss->cbss);
ieee80211_rx_bss_put(local, bss);
}
if (self_disconnected) {
if (deauth)
ieee80211_send_deauth_disassoc(sdata,
IEEE80211_STYPE_DEAUTH, reason);
else
ieee80211_send_deauth_disassoc(sdata,
IEEE80211_STYPE_DISASSOC, reason);
}
ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
changed |= ieee80211_reset_erp_info(sdata);
ieee80211_led_assoc(local, 0);
changed |= BSS_CHANGED_ASSOC;
sdata->vif.bss_conf.assoc = false;
ieee80211_sta_send_apinfo(sdata);
if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
ifmgd->state = IEEE80211_STA_MLME_DISABLED;
ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
sdata->local->hw.conf.channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
}
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, ifmgd->bssid);
if (!sta) {
rcu_read_unlock();
return;
}
sta_info_unlink(&sta);
rcu_read_unlock();
sta_info_destroy(sta);
}
static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
{
if (!sdata || !sdata->default_key ||
sdata->default_key->conf.alg != ALG_WEP)
return 0;
return 1;
}
static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct ieee80211_bss *bss;
int bss_privacy;
int wep_privacy;
int privacy_invoked;
if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME))
return 0;
bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
local->hw.conf.channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
if (!bss)
return 0;
bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
wep_privacy = !!ieee80211_sta_wep_configured(sdata);
privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED);
ieee80211_rx_bss_put(local, bss);
if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
return 0;
return 1;
}
static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
ifmgd->assoc_tries++;
if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
printk(KERN_DEBUG "%s: association with AP %pM"
" timed out\n",
sdata->dev->name, ifmgd->bssid);
ifmgd->state = IEEE80211_STA_MLME_DISABLED;
ieee80211_recalc_idle(local);
cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
sdata->local->hw.conf.channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
/*
* We might have a pending scan which had no chance to run yet
* due to state == IEEE80211_STA_MLME_ASSOCIATE.
* Hence, queue the STAs work again
*/
queue_work(local->hw.workqueue, &ifmgd->work);
return;
}
ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
printk(KERN_DEBUG "%s: associate with AP %pM\n",
sdata->dev->name, ifmgd->bssid);
if (ieee80211_privacy_mismatch(sdata)) {
printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
"mixed-cell disabled - abort association\n", sdata->dev->name);
ifmgd->state = IEEE80211_STA_MLME_DISABLED;
ieee80211_recalc_idle(local);
return;
}
ieee80211_send_assoc(sdata);
mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
}
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 periodical probe request to
* the AP.
*/
if (!is_multicast_ether_addr(hdr->addr1))
mod_timer(&sdata->u.mgd.timer,
jiffies + IEEE80211_MONITORING_INTERVAL);
}
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);
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
/*
* The driver has already reported this event and we have
* already sent a probe request. Maybe the AP died and the
* driver keeps reporting until we disassociate... We have
* to ignore that because otherwise we would continually
* reset the timer and never check whether we received a
* probe response!
*/
if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL)
return;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM "
"- sending probe request\n", sdata->dev->name,
sdata->u.mgd.bssid);
}
#endif
ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
mutex_lock(&sdata->local->iflist_mtx);
ieee80211_recalc_ps(sdata->local, -1);
mutex_unlock(&sdata->local->iflist_mtx);
ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
ifmgd->ssid_len, NULL, 0);
mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
}
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
queue_work(sdata->local->hw.workqueue,
&sdata->u.mgd.beacon_loss_work);
}
EXPORT_SYMBOL(ieee80211_beacon_loss);
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
unsigned long last_rx;
bool disassoc = false;
/* TODO: start monitoring current AP signal quality and number of
* missed beacons. Scan other channels every now and then and search
* for better APs. */
/* TODO: remove expired BSSes */
ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED;
rcu_read_lock();
sta = sta_info_get(local, ifmgd->bssid);
if (!sta) {
printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
sdata->dev->name, ifmgd->bssid);
disassoc = true;
rcu_read_unlock();
goto out;
}
last_rx = sta->last_rx;
rcu_read_unlock();
if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) &&
time_after(jiffies, last_rx + IEEE80211_PROBE_WAIT)) {
printk(KERN_DEBUG "%s: no probe response from AP %pM "
"- disassociating\n",
sdata->dev->name, ifmgd->bssid);
disassoc = true;
ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
goto out;
}
/*
* Beacon filtering is only enabled with power save and then the
* stack should not check for beacon loss.
*/
if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) &&
(local->hw.conf.flags & IEEE80211_CONF_PS)) &&
time_after(jiffies,
ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: beacon loss from AP %pM "
"- sending probe request\n",
sdata->dev->name, ifmgd->bssid);
}
#endif
ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
ifmgd->ssid_len, NULL, 0);
mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
goto out;
}
if (time_after(jiffies, last_rx + IEEE80211_PROBE_IDLE_TIME)) {
ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL;
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid,
ifmgd->ssid_len, NULL, 0);
}
out:
if (!disassoc)
mod_timer(&ifmgd->timer,
jiffies + IEEE80211_MONITORING_INTERVAL);
else
ieee80211_set_disassoc(sdata, true, true,
WLAN_REASON_PREV_AUTH_NOT_VALID);
}
static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
ifmgd->flags |= IEEE80211_STA_AUTHENTICATED;
if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
/* Wait for SME to request association */
ifmgd->state = IEEE80211_STA_MLME_DISABLED;
ieee80211_recalc_idle(sdata->local);
} else
ieee80211_associate(sdata);
}
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
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, sdata->u.mgd.auth_alg,
elems.challenge - 2, elems.challenge_len + 2,
sdata->u.mgd.bssid, 1);
sdata->u.mgd.auth_transaction = 4;
}
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
size_t len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
u16 auth_alg, auth_transaction, status_code;
if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE)
return;
if (len < 24 + 6)
return;
if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
return;
if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
return;
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 != ifmgd->auth_alg ||
auth_transaction != ifmgd->auth_transaction)
return;
if (status_code != WLAN_STATUS_SUCCESS) {
if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
u8 algs[3];
const int num_algs = ARRAY_SIZE(algs);
int i, pos;
algs[0] = algs[1] = algs[2] = 0xff;
if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
algs[0] = WLAN_AUTH_OPEN;
if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
algs[1] = WLAN_AUTH_SHARED_KEY;
if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
algs[2] = WLAN_AUTH_LEAP;
if (ifmgd->auth_alg == WLAN_AUTH_OPEN)
pos = 0;
else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY)
pos = 1;
else
pos = 2;
for (i = 0; i < num_algs; i++) {
pos++;
if (pos >= num_algs)
pos = 0;
if (algs[pos] == ifmgd->auth_alg ||
algs[pos] == 0xff)
continue;
if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
!ieee80211_sta_wep_configured(sdata))
continue;
ifmgd->auth_alg = algs[pos];
break;
}
}
return;
}
switch (ifmgd->auth_alg) {
case WLAN_AUTH_OPEN:
case WLAN_AUTH_LEAP:
case WLAN_AUTH_FT:
ieee80211_auth_completed(sdata);
cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
break;
case WLAN_AUTH_SHARED_KEY:
if (ifmgd->auth_transaction == 4) {
ieee80211_auth_completed(sdata);
cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len);
} else
ieee80211_auth_challenge(sdata, mgmt, len);
break;
}
}
static void ieee80211_rx_mgmt_deauth(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;
if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
return;
reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED)
printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n",
sdata->dev->name, reason_code);
if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
(ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE ||
ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) {
ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
mod_timer(&ifmgd->timer, jiffies +
IEEE80211_RETRY_AUTH_INTERVAL);
}
ieee80211_set_disassoc(sdata, true, false, 0);
ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED;
cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len);
}
static void 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;
if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN))
return;
reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
if (ifmgd->flags & IEEE80211_STA_ASSOCIATED)
printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n",
sdata->dev->name, reason_code);
if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) {
ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE;
mod_timer(&ifmgd->timer, jiffies +
IEEE80211_RETRY_AUTH_INTERVAL);
}
ieee80211_set_disassoc(sdata, false, false, reason_code);
cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len);
}
static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
size_t len,
int 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 (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
return;
if (len < 24 + 6)
return;
if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0)
return;
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);
if (ms > IEEE80211_ASSOC_TIMEOUT)
mod_timer(&ifmgd->timer,
jiffies + msecs_to_jiffies(ms));
return;
}
if (status_code != WLAN_STATUS_SUCCESS) {
printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
sdata->dev->name, status_code);
/* if this was a reassociation, ensure we try a "full"
* association next time. This works around some broken APs
* which do not correctly reject reassociation requests. */
ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
/* Wait for SME to decide what to do next */
ifmgd->state = IEEE80211_STA_MLME_DISABLED;
ieee80211_recalc_idle(local);
}
return;
}
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;
}
printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
ifmgd->aid = aid;
ifmgd->ap_capab = capab_info;
kfree(ifmgd->assocresp_ies);
ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt);
ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL);
if (ifmgd->assocresp_ies)
memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len);
rcu_read_lock();
/* Add STA entry for the AP */
sta = sta_info_get(local, ifmgd->bssid);
if (!sta) {
newsta = true;
sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC);
if (!sta) {
printk(KERN_DEBUG "%s: failed to alloc STA entry for"
" the AP\n", sdata->dev->name);
rcu_read_unlock();
return;
}
/* update new sta with its last rx activity */
sta->last_rx = jiffies;
}
/*
* FIXME: Do we really need to update the sta_info's information here?
* We already know about the AP (we found it in our list) so it
* should already be filled with the right info, no?
* As is stands, all this is racy because typically we assume
* the information that is filled in here (except flags) doesn't
* change while a STA structure is alive. As such, it should move
* to between the sta_info_alloc() and sta_info_insert() above.
*/
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);
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 TKIP/WEP is used, no need to parse AP's HT capabilities */
if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))
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;
}
}
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_TKIP_WEP_USED))
changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
ap_ht_cap_flags);
/* set AID and assoc capability,
* ieee80211_set_associated() will tell the driver */
bss_conf->aid = aid;
bss_conf->assoc_capability = capab_info;
ieee80211_set_associated(sdata, changed);
/*
* initialise the time of last beacon to be the association time,
* otherwise beacon loss check will trigger immediately
*/
ifmgd->last_beacon = jiffies;
ieee80211_associated(sdata);
cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len);
}
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)
return;
if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
(memcmp(mgmt->bssid, sdata->u.mgd.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);
}
ieee80211_rx_bss_put(local, bss);
}
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
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;
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 (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) {
printk(KERN_DEBUG "%s direct probe responded\n",
sdata->dev->name);
ieee80211_authenticate(sdata);
}
if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
mutex_lock(&sdata->local->iflist_mtx);
ieee80211_recalc_ps(sdata->local, -1);
mutex_unlock(&sdata->local->iflist_mtx);
}
}
/*
* 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;
/* 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;
if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
return;
if (ifmgd->flags & IEEE80211_STA_PROBEREQ_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_PROBEREQ_POLL;
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
}
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_TKIP_WEP_USED)) {
struct sta_info *sta;
struct ieee80211_supported_band *sband;
u16 ap_ht_cap_flags;
rcu_read_lock();
sta = sta_info_get(local, ifmgd->bssid);
if (!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,
ap_ht_cap_flags);
}
if (elems.country_elem) {
/* Note we are only reviewing this on beacons
* for the BSSID we are associated to */
regulatory_hint_11d(local->hw.wiphy,
elems.country_elem, elems.country_elem_len);
/* 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:
skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
queue_work(local->hw.workqueue, &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_rx_status *rx_status;
struct ieee80211_mgmt *mgmt;
u16 fc;
rx_status = (struct ieee80211_rx_status *) skb->cb;
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = le16_to_cpu(mgmt->frame_control);
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_PROBE_RESP:
ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
rx_status);
break;
case IEEE80211_STYPE_BEACON:
ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
rx_status);
break;
case IEEE80211_STYPE_AUTH:
ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
break;
case IEEE80211_STYPE_ASSOC_RESP:
ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0);
break;
case IEEE80211_STYPE_REASSOC_RESP:
ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1);
break;
case IEEE80211_STYPE_DEAUTH:
ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
break;
case IEEE80211_STYPE_DISASSOC:
ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
break;
}
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;
}
set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
queue_work(local->hw.workqueue, &ifmgd->work);
}
static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
/* Reset own TSF to allow time synchronization work. */
drv_reset_tsf(local);
ifmgd->wmm_last_param_set = -1; /* allow any WMM update */
if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN)
ifmgd->auth_alg = WLAN_AUTH_OPEN;
else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY;
else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP)
ifmgd->auth_alg = WLAN_AUTH_LEAP;
else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT)
ifmgd->auth_alg = WLAN_AUTH_FT;
else
ifmgd->auth_alg = WLAN_AUTH_OPEN;
ifmgd->auth_transaction = -1;
ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
ifmgd->assoc_scan_tries = 0;
ifmgd->direct_probe_tries = 0;
ifmgd->auth_tries = 0;
ifmgd->assoc_tries = 0;
netif_tx_stop_all_queues(sdata->dev);
netif_carrier_off(sdata->dev);
}
static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
struct ieee80211_bss *bss;
u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid;
u8 ssid_len = ifmgd->ssid_len;
u16 capa_mask = WLAN_CAPABILITY_ESS;
u16 capa_val = WLAN_CAPABILITY_ESS;
struct ieee80211_channel *chan = local->oper_channel;
if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) &&
ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL |
IEEE80211_STA_AUTO_BSSID_SEL |
IEEE80211_STA_AUTO_CHANNEL_SEL)) {
capa_mask |= WLAN_CAPABILITY_PRIVACY;
if (sdata->default_key)
capa_val |= WLAN_CAPABILITY_PRIVACY;
}
if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
chan = NULL;
if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL)
bssid = NULL;
if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) {
ssid = NULL;
ssid_len = 0;
}
bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
bssid, ssid, ssid_len,
capa_mask, capa_val);
if (bss) {
local->oper_channel = bss->cbss.channel;
local->oper_channel_type = NL80211_CHAN_NO_HT;
ieee80211_hw_config(local, 0);
if (!(ifmgd->flags & IEEE80211_STA_SSID_SET))
ieee80211_sta_set_ssid(sdata, bss->ssid,
bss->ssid_len);
ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
bss->supp_rates);
if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED)
sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED;
else
sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED;
/* Send out direct probe if no probe resp was received or
* the one we have is outdated
*/
if (!bss->last_probe_resp ||
time_after(jiffies, bss->last_probe_resp
+ IEEE80211_SCAN_RESULT_EXPIRE))
ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
else
ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
ieee80211_rx_bss_put(local, bss);
ieee80211_sta_reset_auth(sdata);
return 0;
} else {
if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
ifmgd->assoc_scan_tries++;
ieee80211_request_internal_scan(sdata, ifmgd->ssid,
ssid_len);
ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
} else {
ifmgd->assoc_scan_tries = 0;
ifmgd->state = IEEE80211_STA_MLME_DISABLED;
ieee80211_recalc_idle(local);
}
}
return -1;
}
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;
if (!netif_running(sdata->dev))
return;
if (local->sw_scanning || local->hw_scanning)
return;
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
return;
/*
* Nothing should have been stuffed into the workqueue during
* the suspend->resume cycle. If this WARN is seen then there
* is a bug with either the driver suspend or something in
* mac80211 stuffing into the workqueue which we haven't yet
* cleared during mac80211's suspend cycle.
*/
if (WARN_ON(local->suspended))
return;
ifmgd = &sdata->u.mgd;
while ((skb = skb_dequeue(&ifmgd->skb_queue)))
ieee80211_sta_rx_queued_mgmt(sdata, skb);
if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE &&
ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE &&
ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE &&
test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) {
queue_delayed_work(local->hw.workqueue, &local->scan_work,
round_jiffies_relative(0));
return;
}
if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) {
if (ieee80211_sta_config_auth(sdata))
return;
clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
} else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
return;
ieee80211_recalc_idle(local);
switch (ifmgd->state) {
case IEEE80211_STA_MLME_DISABLED:
break;
case IEEE80211_STA_MLME_DIRECT_PROBE:
ieee80211_direct_probe(sdata);
break;
case IEEE80211_STA_MLME_AUTHENTICATE:
ieee80211_authenticate(sdata);
break;
case IEEE80211_STA_MLME_ASSOCIATE:
ieee80211_associate(sdata);
break;
case IEEE80211_STA_MLME_ASSOCIATED:
ieee80211_associated(sdata);
break;
default:
WARN_ON(1);
break;
}
if (ieee80211_privacy_mismatch(sdata)) {
printk(KERN_DEBUG "%s: privacy configuration mismatch and "
"mixed-cell disabled - disassociate\n", sdata->dev->name);
ieee80211_set_disassoc(sdata, false, true,
WLAN_REASON_UNSPECIFIED);
}
}
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
/*
* Need to update last_beacon to avoid beacon loss
* test to trigger.
*/
sdata->u.mgd.last_beacon = jiffies;
queue_work(sdata->local->hw.workqueue,
&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);
}
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;
u32 hw_flags;
ifmgd = &sdata->u.mgd;
INIT_WORK(&ifmgd->work, ieee80211_sta_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->chswitch_timer, ieee80211_chswitch_timer,
(unsigned long) sdata);
skb_queue_head_init(&ifmgd->skb_queue);
ifmgd->capab = WLAN_CAPABILITY_ESS;
ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN |
IEEE80211_AUTH_ALG_SHARED_KEY;
ifmgd->flags |= IEEE80211_STA_CREATE_IBSS |
IEEE80211_STA_AUTO_BSSID_SEL |
IEEE80211_STA_AUTO_CHANNEL_SEL;
if (sdata->local->hw.queues >= 4)
ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
hw_flags = sdata->local->hw.flags;
if (hw_flags & IEEE80211_HW_SUPPORTS_PS) {
ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE;
sdata->local->hw.conf.dynamic_ps_timeout = 500;
}
}
/* configuration hooks */
void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
return;
if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET |
IEEE80211_STA_AUTO_BSSID_SEL)) &&
(ifmgd->flags & (IEEE80211_STA_SSID_SET |
IEEE80211_STA_AUTO_SSID_SEL))) {
if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
ieee80211_set_disassoc(sdata, true, true,
WLAN_REASON_DEAUTH_LEAVING);
if (ifmgd->ssid_len == 0) {
/*
* Only allow association to be started if a valid SSID
* is configured.
*/
return;
}
if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) ||
ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE)
set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request);
else if (ifmgd->flags & IEEE80211_STA_EXT_SME)
set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request);
queue_work(local->hw.workqueue, &ifmgd->work);
}
}
int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (ifmgd->ssid_len)
ifmgd->flags |= IEEE80211_STA_SSID_SET;
else
ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
return 0;
}
int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
{
struct ieee80211_if_managed *ifmgd;
if (len > IEEE80211_MAX_SSID_LEN)
return -EINVAL;
ifmgd = &sdata->u.mgd;
if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) {
if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
ieee80211_set_disassoc(sdata, true, true,
WLAN_REASON_DEAUTH_LEAVING);
/*
* Do not use reassociation if SSID is changed (different ESS).
*/
ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid));
memcpy(ifmgd->ssid, ssid, len);
ifmgd->ssid_len = len;
}
return ieee80211_sta_commit(sdata);
}
int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len);
*len = ifmgd->ssid_len;
return 0;
}
int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (compare_ether_addr(bssid, ifmgd->bssid) != 0 &&
ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)
ieee80211_set_disassoc(sdata, true, true,
WLAN_REASON_DEAUTH_LEAVING);
if (is_valid_ether_addr(bssid)) {
memcpy(ifmgd->bssid, bssid, ETH_ALEN);
ifmgd->flags |= IEEE80211_STA_BSSID_SET;
} else {
memset(ifmgd->bssid, 0, ETH_ALEN);
ifmgd->flags &= ~IEEE80211_STA_BSSID_SET;
}
return ieee80211_sta_commit(sdata);
}
int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
const char *ie, size_t len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (len == 0 && ifmgd->extra_ie_len == 0)
return -EALREADY;
if (len == ifmgd->extra_ie_len && ifmgd->extra_ie &&
memcmp(ifmgd->extra_ie, ie, len) == 0)
return -EALREADY;
kfree(ifmgd->extra_ie);
if (len == 0) {
ifmgd->extra_ie = NULL;
ifmgd->extra_ie_len = 0;
return 0;
}
ifmgd->extra_ie = kmalloc(len, GFP_KERNEL);
if (!ifmgd->extra_ie) {
ifmgd->extra_ie_len = 0;
return -ENOMEM;
}
memcpy(ifmgd->extra_ie, ie, len);
ifmgd->extra_ie_len = len;
return 0;
}
int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason)
{
printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n",
sdata->dev->name, reason);
ieee80211_set_disassoc(sdata, true, true, reason);
return 0;
}
int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n",
sdata->dev->name, reason);
if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED))
return -ENOLINK;
ieee80211_set_disassoc(sdata, false, true, reason);
return 0;
}
/* 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;
}
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