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linux/net/mac80211/mlme.c

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/*
* BSS client mode implementation
* Copyright 2003-2008, Jouni Malinen <j@w1.fi>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include "ieee80211_i.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_INTERVAL (60 * HZ)
#define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
/* 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;
}
/* frame sending functions */
static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
{
if (ies)
memcpy(skb_put(skb, ies_len), ies, ies_len);
}
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, *e_ies;
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;
size_t e_ies_len;
if (ifmgd->flags & IEEE80211_IBSS_PREV_BSSID_SET) {
e_ies = sdata->u.mgd.ie_reassocreq;
e_ies_len = sdata->u.mgd.ie_reassocreq_len;
} else {
e_ies = sdata->u.mgd.ie_assocreq;
e_ies_len = sdata->u.mgd.ie_assocreq_len;
}
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
ifmgd->ssid_len + e_ies_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_FAT_ABOVE) {
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_FAT_BELOW) {
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));
}
add_extra_ies(skb, e_ies, e_ies_len);
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;
u8 *ies;
size_t ies_len;
if (stype == IEEE80211_STYPE_DEAUTH) {
ies = sdata->u.mgd.ie_deauth;
ies_len = sdata->u.mgd.ie_deauth_len;
} else {
ies = sdata->u.mgd.ie_disassoc;
ies_len = sdata->u.mgd.ie_disassoc_len;
}
skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
ies_len);
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);
add_extra_ies(skb, ies, ies_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);
}
/* 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));
if (!local->ops->conf_tx)
return;
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:
queue = 3;
if (acm)
local->wmm_acm |= BIT(0) | BIT(3);
break;
case 2:
queue = 1;
if (acm)
local->wmm_acm |= BIT(4) | BIT(5);
break;
case 3:
queue = 0;
if (acm)
local->wmm_acm |= BIT(6) | BIT(7);
break;
case 0:
default:
queue = 2;
if (acm)
local->wmm_acm |= BIT(1) | BIT(2);
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",
local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
params.cw_max, params.txop);
#endif
/* TODO: handle ACM (block TX, fallback to next lowest allowed
* AC for now) */
if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
printk(KERN_DEBUG "%s: failed to set TX queue "
"parameters for queue %d\n", local->mdev->name, queue);
}
}
}
static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
{
u8 mask;
u8 index, indexn1, indexn2;
struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
aid &= 0x3fff;
index = aid / 8;
mask = 1 << (aid & 7);
indexn1 = tim->bitmap_ctrl & 0xfe;
indexn2 = elems->tim_len + indexn1 - 4;
if (index < indexn1 || index > indexn2)
return false;
index -= indexn1;
return !!(tim->virtual_map[index] & mask);
}
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 |= ieee80211_handle_bss_capability(sdata,
bss->cbss.capability, bss->has_erp_value, bss->erp_value);
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;
ieee80211_bss_info_change_notify(sdata, bss_info_changed);
if (local->powersave) {
if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
local->hw.conf.dynamic_ps_timeout > 0) {
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(
local->hw.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);
}
}
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;
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_sta_send_apinfo(sdata);
/*
* 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);
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;
set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
/* 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;
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_sta_send_apinfo(sdata);
ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
sdata->local->hw.conf.channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
return;
}
ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
sdata->dev->name, ifmgd->bssid);
ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, NULL, 0,
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 sta_info *sta;
u32 changed = 0, config_changed = 0;
rcu_read_lock();
sta = sta_info_get(local, ifmgd->bssid);
if (!sta) {
rcu_read_unlock();
return;
}
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);
ieee80211_sta_tear_down_BA_sessions(sta);
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);
}
rcu_read_unlock();
/* channel(_type) changes are handled by ieee80211_hw_config */
local->oper_channel_type = NL80211_CHAN_NO_HT;
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);
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_MIXED_CELL))
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;
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_sta_send_apinfo(sdata);
ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
sdata->local->hw.conf.channel->center_freq,
ifmgd->ssid, ifmgd->ssid_len);
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;
return;
}
ieee80211_send_assoc(sdata);
mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
}
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;
int disassoc;
/* 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 = 1;
} else {
disassoc = 0;
if (time_after(jiffies,
sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) {
printk(KERN_DEBUG "%s: No ProbeResp from "
"current AP %pM - assume out of "
"range\n",
sdata->dev->name, ifmgd->bssid);
disassoc = 1;
} else
ieee80211_send_probe_req(sdata, ifmgd->bssid,
ifmgd->ssid,
ifmgd->ssid_len,
NULL, 0);
ifmgd->flags ^= IEEE80211_STA_PROBEREQ_POLL;
} else {
ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
if (time_after(jiffies, ifmgd->last_probe +
IEEE80211_PROBE_INTERVAL)) {
ifmgd->last_probe = jiffies;
ieee80211_send_probe_req(sdata, ifmgd->bssid,
ifmgd->ssid,
ifmgd->ssid_len,
NULL, 0);
}
}
}
rcu_read_unlock();
if (disassoc)
ieee80211_set_disassoc(sdata, true, true,
WLAN_REASON_PREV_AUTH_NOT_VALID);
else
mod_timer(&ifmgd->timer, jiffies +
IEEE80211_MONITORING_INTERVAL);
}
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;
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:
ieee80211_auth_completed(sdata);
break;
case WLAN_AUTH_SHARED_KEY:
if (ifmgd->auth_transaction == 4)
ieee80211_auth_completed(sdata);
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->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;
}
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->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);
}
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;
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 |
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.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);
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);
ieee80211_associated(sdata);
}
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_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)
{
size_t baselen;
struct ieee802_11_elems elems;
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 (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE,
&sdata->u.mgd.request)) {
printk(KERN_DEBUG "%s direct probe responded\n",
sdata->dev->name);
ieee80211_authenticate(sdata);
}
}
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;
size_t baselen;
struct ieee802_11_elems elems;
struct ieee80211_local *local = sdata->local;
u32 changed = 0;
bool erp_valid, directed_tim;
u8 erp_value = 0;
/* Process beacon from the current BSS */
baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
if (baselen > len)
return;
ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems);
ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return;
ifmgd = &sdata->u.mgd;
if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED) ||
memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0)
return;
if (rx_status->freq != local->hw.conf.channel->center_freq)
return;
ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
elems.wmm_param_len);
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
directed_tim = ieee80211_check_tim(&elems, ifmgd->aid);
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 (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_rx_status *rx_status)
{
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:
memcpy(skb->cb, rx_status, sizeof(*rx_status));
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;
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;
if (local->ops->reset_tsf) {
/* Reset own TSF to allow time synchronization work. */
local->ops->reset_tsf(local_to_hw(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
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_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) {
ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
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++;
/* XXX maybe racy? */
if (local->scan_req)
return -1;
memcpy(local->int_scan_req.ssids[0].ssid,
ifmgd->ssid, IEEE80211_MAX_SSID_LEN);
if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL)
local->int_scan_req.ssids[0].ssid_len = 0;
else
local->int_scan_req.ssids[0].ssid_len = ifmgd->ssid_len;
ieee80211_start_scan(sdata, &local->int_scan_req);
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;
}
}
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;
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)) {
ieee80211_start_scan(sdata, local->scan_req);
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;
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)
queue_work(sdata->local->hw.workqueue,
&sdata->u.mgd.work);
}
/* 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->chswitch_work, ieee80211_chswitch_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 (ieee80211_num_regular_queues(&sdata->local->hw) >= 4)
ifmgd->flags |= IEEE80211_STA_WMM_ENABLED;
}
/* 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);
set_bit(IEEE80211_STA_REQ_AUTH, &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;
ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
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) {
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 (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;
}
if (netif_running(sdata->dev)) {
if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
printk(KERN_DEBUG "%s: Failed to config new BSSID to "
"the low-level driver\n", sdata->dev->name);
}
}
return ieee80211_sta_commit(sdata);
}
int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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);
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return -EINVAL;
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 (sdata->vif.type != NL80211_IFTYPE_STATION)
return -EINVAL;
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();
}
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->scan_sdata;
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;
queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
}
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);
}
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