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linux/net/mac80211/mlme.c
Felix Fietkau d790744880 mac80211: add missing sanity checks for action frames 
Various missing sanity checks caused rejected action frames to be
interpreted as channel switch announcements, which can cause a client
mode interface to switch away from its operating channel, thereby losing
connectivity. This patch ensures that only spectrum management action
frames are processed by the CSA handling function and prevents rejected
action frames from getting processed by the MLME code.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Cc: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-01-08 15:49:28 -05:00

2613 lines
70 KiB
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_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
ieee80211_tx_skb(sdata, skb);
}
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);
if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
ieee80211_tx_skb(sdata, skb);
}
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_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
ieee80211_tx_skb(sdata, skb);
}
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_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
ieee80211_tx_skb(sdata, skb);
}
/* 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);
/*
* Always handle WMM once after association regardless
* of the first value the AP uses. Setting -1 here has
* that effect because the AP values is an unsigned
* 4-bit value.
*/
sdata->u.mgd.wmm_last_param_set = -1;
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_tx_start_all_queues(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_tx_stop_all_queues(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);
/* 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);
ieee80211_recalc_idle(sdata->local);
} 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);
ieee80211_recalc_idle(sdata->local);
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_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:
if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
break;
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);
ieee80211_recalc_idle(local);
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;
bool not_auth_yet = false;
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;
if (wk->state == IEEE80211_MGD_STATE_PROBE)
not_auth_yet = true;
list_del(&wk->list);
kfree(wk);
break;
}
}
/*
* If somebody requests authentication and we haven't
* sent out an auth frame yet there's no need to send
* out a deauth frame either. If the state was PROBE,
* then this is the case. If it's AUTH we have sent a
* frame, and if it's IDLE we have completed the auth
* process already.
*/
if (not_auth_yet) {
mutex_unlock(&ifmgd->mtx);
__cfg80211_auth_canceled(sdata->dev, bssid);
return 0;
}
/*
* 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);
ieee80211_recalc_idle(sdata->local);
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);
ieee80211_recalc_idle(sdata->local);
return 0;
}
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