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madwifi/net80211/ieee80211_beacon.c

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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id$
*/
#ifndef EXPORT_SYMTAB
#define EXPORT_SYMTAB
#endif
/*
* IEEE 802.11 beacon handling routines
*/
#ifndef AUTOCONF_INCLUDED
#include <linux/config.h>
#endif
#include <linux/version.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include "if_media.h"
#include <net80211/ieee80211_var.h>
static u_int8_t *
ieee80211_beacon_init(struct ieee80211_node *ni, struct ieee80211_beacon_offsets *bo,
u_int8_t *frm)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
u_int16_t capinfo;
struct ieee80211_rateset *rs = &ni->ni_rates;
KASSERT(ic->ic_bsschan != IEEE80211_CHAN_ANYC, ("no bss chan"));
/* XXX timestamp is set by hardware/driver */
memset(frm, 0, 8);
frm += 8;
/* beacon interval */
*(__le16 *)frm = htole16(ni->ni_intval);
frm += 2;
/* capability information */
if (vap->iv_opmode == IEEE80211_M_IBSS)
capinfo = IEEE80211_CAPINFO_IBSS;
else
capinfo = IEEE80211_CAPINFO_ESS;
if (vap->iv_flags & IEEE80211_F_PRIVACY)
capinfo |= IEEE80211_CAPINFO_PRIVACY;
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan))
capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
if (ic->ic_flags & IEEE80211_F_SHSLOT)
capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
if (ic->ic_flags & IEEE80211_F_DOTH)
capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
bo->bo_caps = (__le16 *)frm;
*(__le16 *)frm = htole16(capinfo);
frm += 2;
/* ssid */
*frm++ = IEEE80211_ELEMID_SSID;
if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) {
*frm++ = ni->ni_esslen;
memcpy(frm, ni->ni_essid, ni->ni_esslen);
frm += ni->ni_esslen;
} else
*frm++ = 0;
/* supported rates */
frm = ieee80211_add_rates(frm, rs);
/* XXX: better way to check this? */
/* XXX: how about DS ? */
if (!IEEE80211_IS_CHAN_FHSS(ic->ic_bsschan)) {
*frm++ = IEEE80211_ELEMID_DSPARMS;
*frm++ = 1;
*frm++ = ieee80211_chan2ieee(ic, ic->ic_bsschan);
}
bo->bo_tim = frm;
/* IBSS/TIM */
if (vap->iv_opmode == IEEE80211_M_IBSS) {
*frm++ = IEEE80211_ELEMID_IBSSPARMS;
*frm++ = 2;
*frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
bo->bo_tim_len = 0;
} else {
struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *)frm;
tie->tim_ie = IEEE80211_ELEMID_TIM;
tie->tim_len = 4; /* length */
tie->tim_count = 0; /* DTIM count */
tie->tim_period = vap->iv_dtim_period; /* DTIM period */
tie->tim_bitctl = 0; /* bitmap control */
tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */
frm += sizeof(struct ieee80211_tim_ie);
bo->bo_tim_len = 1;
}
bo->bo_tim_trailer = frm;
/* country */
if ((ic->ic_flags & IEEE80211_F_DOTH) ||
(ic->ic_flags_ext & IEEE80211_FEXT_COUNTRYIE))
frm = ieee80211_add_country(frm, ic);
/* power constraint */
if (ic->ic_flags & IEEE80211_F_DOTH)
frm = ieee80211_add_pwrcnstr(frm, ic);
/* channel switch announcement */
bo->bo_chanswitch = frm;
/* ERP */
if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan)) {
bo->bo_erp = frm;
frm = ieee80211_add_erp(frm, ic);
}
/* Ext. Supp. Rates */
frm = ieee80211_add_xrates(frm, rs);
/* WME */
if (vap->iv_flags & IEEE80211_F_WME) {
bo->bo_wme = frm;
frm = ieee80211_add_wme_param(frm, &ic->ic_wme, IEEE80211_VAP_UAPSD_ENABLED(vap));
vap->iv_flags &= ~IEEE80211_F_WMEUPDATE;
}
/* WPA 1+2 */
if (vap->iv_flags & IEEE80211_F_WPA)
frm = ieee80211_add_wpa(frm, vap);
/* athAdvCaps */
bo->bo_ath_caps = frm;
if (vap->iv_bss && vap->iv_bss->ni_ath_flags)
frm = ieee80211_add_athAdvCap(frm, vap->iv_bss->ni_ath_flags,
vap->iv_bss->ni_ath_defkeyindex);
/* XR */
bo->bo_xr = frm;
#ifdef ATH_SUPERG_XR
if (vap->iv_xrvap && vap->iv_ath_cap & IEEE80211_ATHC_XR) /* XR */
frm = ieee80211_add_xr_param(frm, vap);
#endif
bo->bo_appie_buf = frm;
bo->bo_appie_buf_len = 0;
bo->bo_tim_trailerlen = frm - bo->bo_tim_trailer;
bo->bo_chanswitch_trailerlen = frm - bo->bo_chanswitch;
return frm;
}
/*
* Allocate a beacon frame and fillin the appropriate bits.
*/
struct sk_buff *
ieee80211_beacon_alloc(struct ieee80211_node *ni,
struct ieee80211_beacon_offsets *bo)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_frame *wh;
struct sk_buff *skb;
int pktlen;
u_int8_t *frm;
struct ieee80211_rateset *rs;
/*
* beacon frame format
* [8] time stamp
* [2] beacon interval
* [2] capability information
* [tlv] ssid
* [tlv] supported rates
* [7] FH/DS parameter set
* [tlv] IBSS/TIM parameter set
* [tlv] country code
* [3] power constraint
* [5] channel switch announcement
* [3] extended rate phy (ERP)
* [tlv] extended supported rates
* [tlv] WME parameters
* [tlv] WPA/RSN parameters
* [tlv] Atheros Advanced Capabilities
* [tlv] AtherosXR parameters
* XXX Vendor-specific OIDs (e.g. Atheros)
* NB: we allocate the max space required for the TIM bitmap.
*/
rs = &ni->ni_rates;
pktlen = 8 /* time stamp */
+ sizeof(u_int16_t) /* beacon interval */
+ sizeof(u_int16_t) /* capability information */
+ 2 + ni->ni_esslen /* ssid */
+ 2 + IEEE80211_RATE_SIZE /* supported rates */
+ 7 /* FH/DS parameters max(7,3) */
+ 2 + 4 + vap->iv_tim_len /* IBSS/TIM parameter set*/
+ ic->ic_country_ie.country_len + 2 /* country code */
+ 3 /* power constraint */
+ 5 /* channel switch announcement */
+ 3 /* ERP */
+ 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) /* Ext. Supp. Rates */
+ (vap->iv_caps & IEEE80211_C_WME ? /* WME */
sizeof(struct ieee80211_wme_param) : 0)
+ (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */
2 * sizeof(struct ieee80211_ie_wpa) : 0)
+ sizeof(struct ieee80211_ie_athAdvCap)
#ifdef ATH_SUPERG_XR
+ (ic->ic_ath_cap & IEEE80211_ATHC_XR ? /* XR */
sizeof(struct ieee80211_xr_param) : 0)
#endif
;
skb = ieee80211_getmgtframe(&frm, pktlen);
if (skb == NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
"%s: cannot get buf; size %u", __func__, pktlen);
vap->iv_stats.is_tx_nobuf++;
return NULL;
}
SKB_NI(skb) = ieee80211_ref_node(ni);
frm = ieee80211_beacon_init(ni, bo, frm);
skb_trim(skb, frm - skb->data);
wh = (struct ieee80211_frame *)
skb_push(skb, sizeof(struct ieee80211_frame));
wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
IEEE80211_FC0_SUBTYPE_BEACON;
wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
wh->i_dur = 0;
IEEE80211_ADDR_COPY(wh->i_addr1, ic->ic_dev->broadcast);
IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bssid);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: beacon bssid:" MAC_FMT "\n",
__func__, MAC_ADDR(wh->i_addr3));
*(u_int16_t *)wh->i_seq = 0;
return skb;
}
EXPORT_SYMBOL(ieee80211_beacon_alloc);
/*
* Update the dynamic parts of a beacon frame based on the current state.
*/
int
ieee80211_beacon_update(struct ieee80211_node *ni,
struct ieee80211_beacon_offsets *bo, struct sk_buff *skb,
int mcast, int *is_dtim)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
int len_changed = 0;
u_int16_t capinfo;
IEEE80211_LOCK_IRQ(ic);
/* Check if we need to change channel right now */
if ((ic->ic_flags & IEEE80211_F_DOTH) &&
(vap->iv_flags & IEEE80211_F_CHANSWITCH)) {
struct ieee80211_channel *c =
ieee80211_doth_findchan(vap, ic->ic_chanchange_chan);
if (!vap->iv_chanchange_count && !c) {
vap->iv_flags &= ~IEEE80211_F_CHANSWITCH;
ic->ic_flags &= ~IEEE80211_F_CHANSWITCH;
} else if (vap->iv_chanchange_count &&
((!ic->ic_chanchange_tbtt) ||
(vap->iv_chanchange_count == ic->ic_chanchange_tbtt))) {
u_int8_t *frm;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOTH,
"%s: reinit beacon\n", __func__);
/* NB: ic_bsschan is in the DSPARMS beacon IE, so must
* set this prior to the beacon re-init, below. */
if (c == NULL) {
/* Requested channel invalid; drop the channel
* switch announcement and do nothing. */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOTH,
"%s: find channel failure\n", __func__);
} else
ic->ic_bsschan = c;
skb_pull(skb, sizeof(struct ieee80211_frame));
skb_trim(skb, 0);
frm = skb->data;
skb_put(skb, ieee80211_beacon_init(ni, bo, frm) - frm);
skb_push(skb, sizeof(struct ieee80211_frame));
vap->iv_chanchange_count = 0;
vap->iv_flags &= ~IEEE80211_F_CHANSWITCH;
ic->ic_flags &= ~IEEE80211_F_CHANSWITCH;
/* NB: Only for the first VAP to get here, and when we
* have a valid channel to which to change. */
if (c && (ic->ic_curchan != c)) {
ic->ic_curchan = c;
ic->ic_set_channel(ic);
}
len_changed = 1;
}
}
/* XXX faster to recalculate entirely or just changes? */
if (vap->iv_opmode == IEEE80211_M_IBSS)
capinfo = IEEE80211_CAPINFO_IBSS;
else
capinfo = IEEE80211_CAPINFO_ESS;
if (vap->iv_flags & IEEE80211_F_PRIVACY)
capinfo |= IEEE80211_CAPINFO_PRIVACY;
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan))
capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
if (ic->ic_flags & IEEE80211_F_SHSLOT)
capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
if (ic->ic_flags & IEEE80211_F_DOTH)
capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
*bo->bo_caps = htole16(capinfo);
if (vap->iv_flags & IEEE80211_F_WME) {
struct ieee80211_wme_state *wme = &ic->ic_wme;
/*
* Check for aggressive mode change. When there is
* significant high priority traffic in the BSS
* throttle back BE traffic by using conservative
* parameters. Otherwise BE uses aggressive params
* to optimize performance of legacy/non-QoS traffic.
*/
if (wme->wme_flags & WME_F_AGGRMODE) {
if (wme->wme_hipri_traffic >
wme->wme_hipri_switch_thresh) {
IEEE80211_NOTE(vap, IEEE80211_MSG_WME, ni,
"%s: traffic %u, disable aggressive mode",
__func__, wme->wme_hipri_traffic);
wme->wme_flags &= ~WME_F_AGGRMODE;
ieee80211_wme_updateparams_locked(vap);
wme->wme_hipri_traffic =
wme->wme_hipri_switch_hysteresis;
} else
wme->wme_hipri_traffic = 0;
} else {
if (wme->wme_hipri_traffic <=
wme->wme_hipri_switch_thresh) {
IEEE80211_NOTE(vap, IEEE80211_MSG_WME, ni,
"%s: traffic %u, enable aggressive mode",
__func__, wme->wme_hipri_traffic);
wme->wme_flags |= WME_F_AGGRMODE;
ieee80211_wme_updateparams_locked(vap);
wme->wme_hipri_traffic = 0;
} else
wme->wme_hipri_traffic =
wme->wme_hipri_switch_hysteresis;
}
/* XXX multi-bss */
if (vap->iv_flags & IEEE80211_F_WMEUPDATE) {
(void) ieee80211_add_wme_param(bo->bo_wme, wme, IEEE80211_VAP_UAPSD_ENABLED(vap));
vap->iv_flags &= ~IEEE80211_F_WMEUPDATE;
}
}
if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/
struct ieee80211_tim_ie *tie =
(struct ieee80211_tim_ie *)bo->bo_tim;
if (vap->iv_flags & IEEE80211_F_TIMUPDATE) {
u_int timlen, timoff, i;
/*
* ATIM/DTIM needs updating. If it fits in the
* current space allocated then just copy in the
* new bits. Otherwise we need to move any trailing
* data to make room. Note that we know there is
* contiguous space because ieee80211_beacon_allocate
* ensures there is space in the mbuf to write a
* maximal-size virtual bitmap (based on ic_max_aid).
*/
/*
* Calculate the bitmap size and offset, copy any
* trailer out of the way, and then copy in the
* new bitmap and update the information element.
* Note that the tim bitmap must contain at least
* one byte and any offset must be even.
*/
if (vap->iv_ps_pending != 0) {
timoff = 128; /* impossibly large */
for (i = 0; i < vap->iv_tim_len; i++)
if (vap->iv_tim_bitmap[i]) {
timoff = i & BITCTL_BUFD_UCAST_AID_MASK;
break;
}
KASSERT(timoff != 128, ("tim bitmap empty!"));
for (i = vap->iv_tim_len-1; i >= timoff; i--)
if (vap->iv_tim_bitmap[i])
break;
timlen = 1 + (i - timoff);
} else {
timoff = 0;
timlen = 1;
}
if (timlen != bo->bo_tim_len) {
/* copy up/down trailer */
int trailer_adjust =
(tie->tim_bitmap+timlen) - (bo->bo_tim_trailer);
memmove(tie->tim_bitmap+timlen, bo->bo_tim_trailer,
bo->bo_tim_trailerlen);
bo->bo_tim_trailer = tie->tim_bitmap+timlen;
bo->bo_chanswitch += trailer_adjust;
bo->bo_wme += trailer_adjust;
bo->bo_erp += trailer_adjust;
bo->bo_ath_caps += trailer_adjust;
bo->bo_xr += trailer_adjust;
if (timlen > bo->bo_tim_len)
skb_put(skb, timlen - bo->bo_tim_len);
else
skb_trim(skb, skb->len - (bo->bo_tim_len - timlen));
bo->bo_tim_len = timlen;
/* update information element */
tie->tim_len = 3 + timlen;
tie->tim_bitctl = timoff;
len_changed = 1;
}
memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff,
bo->bo_tim_len);
vap->iv_flags &= ~IEEE80211_F_TIMUPDATE;
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"%s: TIM updated, pending %u, off %u, len %u",
__func__, vap->iv_ps_pending, timoff, timlen);
}
/* count down DTIM period */
if (tie->tim_count == 0)
tie->tim_count = tie->tim_period - 1;
else
tie->tim_count--;
/* update state for buffered multicast frames on DTIM */
if (mcast && (tie->tim_count == 0))
tie->tim_bitctl |= BITCTL_BUFD_MCAST;
else
tie->tim_bitctl &= ~BITCTL_BUFD_MCAST;
*is_dtim = (tie->tim_count == 0);
}
/* Whenever we want to switch to a new channel, we need to follow the
* following steps:
*
* - iv_chanchange_count= number of beacon intervals elapsed (0)
* - ic_chanchange_tbtt = number of beacon intervals before switching
* - ic_chanchange_chan = IEEE channel number after switching
* - ic_flags |= IEEE80211_F_CHANSWITCH */
if (IEEE80211_IS_MODE_BEACON(vap->iv_opmode)) {
if ((ic->ic_flags & IEEE80211_F_DOTH) &&
(ic->ic_flags & IEEE80211_F_CHANSWITCH)) {
struct ieee80211_ie_csa *csa_ie =
(struct ieee80211_ie_csa *)bo->bo_chanswitch;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOTH,
"%s: Sending 802.11h chanswitch IE: "
"%d/%d\n", __func__,
ic->ic_chanchange_chan,
ic->ic_chanchange_tbtt);
if (!vap->iv_chanchange_count) {
vap->iv_flags |= IEEE80211_F_CHANSWITCH;
/* copy out trailer to open up a slot */
memmove(bo->bo_chanswitch + sizeof(*csa_ie),
bo->bo_chanswitch,
bo->bo_chanswitch_trailerlen);
/* add ie in opened slot */
csa_ie->csa_id = IEEE80211_ELEMID_CHANSWITCHANN;
/* fixed length */
csa_ie->csa_len = sizeof(*csa_ie) - 2;
/* STA shall transmit no further frames */
csa_ie->csa_mode = 1;
csa_ie->csa_chan = ic->ic_chanchange_chan;
csa_ie->csa_count = ic->ic_chanchange_tbtt;
/* update the trailer lens */
bo->bo_chanswitch_trailerlen += sizeof(*csa_ie);
bo->bo_tim_trailerlen += sizeof(*csa_ie);
bo->bo_wme += sizeof(*csa_ie);
bo->bo_erp += sizeof(*csa_ie);
bo->bo_ath_caps += sizeof(*csa_ie);
bo->bo_xr += sizeof(*csa_ie);
/* indicate new beacon length so other layers
* may manage memory */
skb_put(skb, sizeof(*csa_ie));
len_changed = 1;
} else if (csa_ie->csa_count)
csa_ie->csa_count--;
vap->iv_chanchange_count++;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOTH,
"%s: CHANSWITCH IE, change in %d TBTT\n",
__func__, csa_ie->csa_count);
}
#ifdef ATH_SUPERG_XR
if (vap->iv_flags & IEEE80211_F_XRUPDATE) {
if (vap->iv_xrvap)
(void)ieee80211_add_xr_param(bo->bo_xr, vap);
vap->iv_flags &= ~IEEE80211_F_XRUPDATE;
}
#endif
if ((ic->ic_flags_ext & IEEE80211_FEXT_ERPUPDATE) &&
(bo->bo_erp != NULL)) {
(void)ieee80211_add_erp(bo->bo_erp, ic);
ic->ic_flags_ext &= ~IEEE80211_FEXT_ERPUPDATE;
}
}
/* if it is a mode change beacon for dynamic turbo case */
if (((ic->ic_ath_cap & IEEE80211_ATHC_BOOST) != 0) ^
IEEE80211_IS_CHAN_TURBO(ic->ic_curchan))
ieee80211_add_athAdvCap(bo->bo_ath_caps,
vap->iv_bss->ni_ath_flags,
vap->iv_bss->ni_ath_defkeyindex);
/* add APP_IE buffer if app updated it */
if (vap->iv_flags_ext & IEEE80211_FEXT_APPIE_UPDATE) {
/* adjust the buffer size if the size is changed */
if (vap->app_ie[IEEE80211_APPIE_FRAME_BEACON].length !=
bo->bo_appie_buf_len) {
int diff_len;
diff_len =
vap->app_ie[IEEE80211_APPIE_FRAME_BEACON].
length -
bo->bo_appie_buf_len;
if (diff_len > 0)
skb_put(skb, diff_len);
else
skb_trim(skb, skb->len + diff_len);
bo->bo_appie_buf_len =
vap->app_ie[IEEE80211_APPIE_FRAME_BEACON].
length;
/* update the trailer lens */
bo->bo_chanswitch_trailerlen += diff_len;
bo->bo_tim_trailerlen += diff_len;
len_changed = 1;
}
memcpy(bo->bo_appie_buf,
vap->app_ie[IEEE80211_APPIE_FRAME_BEACON].ie,
vap->app_ie[IEEE80211_APPIE_FRAME_BEACON].length);
vap->iv_flags_ext &= ~IEEE80211_FEXT_APPIE_UPDATE;
}
IEEE80211_UNLOCK_IRQ(ic);
return len_changed;
}
EXPORT_SYMBOL(ieee80211_beacon_update);
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