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c2d1560ad8
Introduce a new file util.c and move a whole bunch of functions into it. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Jiri Benc <jbenc@suse.cz> Signed-off-by: John W. Linville <linville@tuxdriver.com>
464 lines
12 KiB
C
464 lines
12 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* utilities for mac80211
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*/
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#include <net/mac80211.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/wireless.h>
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#include <linux/bitmap.h>
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#include <net/cfg80211.h>
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#include "ieee80211_i.h"
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#include "ieee80211_rate.h"
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#include "wme.h"
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/* privid for wiphys to determine whether they belong to us or not */
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void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
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/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
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/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
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const unsigned char rfc1042_header[] =
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{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
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/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
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const unsigned char bridge_tunnel_header[] =
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{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
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/* No encapsulation header if EtherType < 0x600 (=length) */
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static const unsigned char eapol_header[] =
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{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
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static int rate_list_match(const int *rate_list, int rate)
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{
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int i;
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if (!rate_list)
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return 0;
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for (i = 0; rate_list[i] >= 0; i++)
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if (rate_list[i] == rate)
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return 1;
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return 0;
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}
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void ieee80211_prepare_rates(struct ieee80211_local *local,
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struct ieee80211_hw_mode *mode)
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{
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int i;
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for (i = 0; i < mode->num_rates; i++) {
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struct ieee80211_rate *rate = &mode->rates[i];
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rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
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IEEE80211_RATE_BASIC);
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if (local->supp_rates[mode->mode]) {
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if (!rate_list_match(local->supp_rates[mode->mode],
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rate->rate))
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continue;
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}
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rate->flags |= IEEE80211_RATE_SUPPORTED;
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/* Use configured basic rate set if it is available. If not,
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* use defaults that are sane for most cases. */
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if (local->basic_rates[mode->mode]) {
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if (rate_list_match(local->basic_rates[mode->mode],
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rate->rate))
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rate->flags |= IEEE80211_RATE_BASIC;
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} else switch (mode->mode) {
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case MODE_IEEE80211A:
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if (rate->rate == 60 || rate->rate == 120 ||
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rate->rate == 240)
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rate->flags |= IEEE80211_RATE_BASIC;
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break;
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case MODE_IEEE80211B:
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if (rate->rate == 10 || rate->rate == 20)
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rate->flags |= IEEE80211_RATE_BASIC;
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break;
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case MODE_ATHEROS_TURBO:
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if (rate->rate == 120 || rate->rate == 240 ||
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rate->rate == 480)
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rate->flags |= IEEE80211_RATE_BASIC;
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break;
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case MODE_IEEE80211G:
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if (rate->rate == 10 || rate->rate == 20 ||
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rate->rate == 55 || rate->rate == 110)
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rate->flags |= IEEE80211_RATE_BASIC;
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break;
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}
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/* Set ERP and MANDATORY flags based on phymode */
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switch (mode->mode) {
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case MODE_IEEE80211A:
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if (rate->rate == 60 || rate->rate == 120 ||
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rate->rate == 240)
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rate->flags |= IEEE80211_RATE_MANDATORY;
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break;
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case MODE_IEEE80211B:
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if (rate->rate == 10)
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rate->flags |= IEEE80211_RATE_MANDATORY;
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break;
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case MODE_ATHEROS_TURBO:
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break;
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case MODE_IEEE80211G:
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if (rate->rate == 10 || rate->rate == 20 ||
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rate->rate == 55 || rate->rate == 110 ||
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rate->rate == 60 || rate->rate == 120 ||
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rate->rate == 240)
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rate->flags |= IEEE80211_RATE_MANDATORY;
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break;
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}
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if (ieee80211_is_erp_rate(mode->mode, rate->rate))
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rate->flags |= IEEE80211_RATE_ERP;
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}
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}
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u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
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{
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u16 fc;
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if (len < 24)
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return NULL;
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fc = le16_to_cpu(hdr->frame_control);
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switch (fc & IEEE80211_FCTL_FTYPE) {
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case IEEE80211_FTYPE_DATA:
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switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
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case IEEE80211_FCTL_TODS:
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return hdr->addr1;
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case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
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return NULL;
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case IEEE80211_FCTL_FROMDS:
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return hdr->addr2;
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case 0:
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return hdr->addr3;
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}
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break;
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case IEEE80211_FTYPE_MGMT:
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return hdr->addr3;
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case IEEE80211_FTYPE_CTL:
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if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
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return hdr->addr1;
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else
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return NULL;
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}
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return NULL;
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}
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int ieee80211_get_hdrlen(u16 fc)
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{
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int hdrlen = 24;
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switch (fc & IEEE80211_FCTL_FTYPE) {
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case IEEE80211_FTYPE_DATA:
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if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
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hdrlen = 30; /* Addr4 */
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/*
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* The QoS Control field is two bytes and its presence is
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* indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
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* hdrlen if that bit is set.
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* This works by masking out the bit and shifting it to
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* bit position 1 so the result has the value 0 or 2.
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*/
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hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
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>> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
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break;
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case IEEE80211_FTYPE_CTL:
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/*
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* ACK and CTS are 10 bytes, all others 16. To see how
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* to get this condition consider
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* subtype mask: 0b0000000011110000 (0x00F0)
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* ACK subtype: 0b0000000011010000 (0x00D0)
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* CTS subtype: 0b0000000011000000 (0x00C0)
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* bits that matter: ^^^ (0x00E0)
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* value of those: 0b0000000011000000 (0x00C0)
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*/
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if ((fc & 0xE0) == 0xC0)
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hdrlen = 10;
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else
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hdrlen = 16;
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break;
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}
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return hdrlen;
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}
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EXPORT_SYMBOL(ieee80211_get_hdrlen);
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int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
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{
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const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *) skb->data;
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int hdrlen;
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if (unlikely(skb->len < 10))
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return 0;
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hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
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if (unlikely(hdrlen > skb->len))
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return 0;
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return hdrlen;
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}
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EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
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int ieee80211_is_eapol(const struct sk_buff *skb)
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{
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const struct ieee80211_hdr *hdr;
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u16 fc;
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int hdrlen;
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if (unlikely(skb->len < 10))
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return 0;
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hdr = (const struct ieee80211_hdr *) skb->data;
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fc = le16_to_cpu(hdr->frame_control);
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if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
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return 0;
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hdrlen = ieee80211_get_hdrlen(fc);
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if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
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memcmp(skb->data + hdrlen, eapol_header,
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sizeof(eapol_header)) == 0))
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return 1;
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return 0;
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}
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void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
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hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
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if (tx->u.tx.extra_frag) {
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struct ieee80211_hdr *fhdr;
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int i;
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for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
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fhdr = (struct ieee80211_hdr *)
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tx->u.tx.extra_frag[i]->data;
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fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
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}
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}
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}
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int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
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int rate, int erp, int short_preamble)
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{
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int dur;
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/* calculate duration (in microseconds, rounded up to next higher
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* integer if it includes a fractional microsecond) to send frame of
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* len bytes (does not include FCS) at the given rate. Duration will
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* also include SIFS.
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*
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* rate is in 100 kbps, so divident is multiplied by 10 in the
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* DIV_ROUND_UP() operations.
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*/
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if (local->hw.conf.phymode == MODE_IEEE80211A || erp ||
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local->hw.conf.phymode == MODE_ATHEROS_TURBO) {
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/*
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* OFDM:
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*
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* N_DBPS = DATARATE x 4
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* N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
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* (16 = SIGNAL time, 6 = tail bits)
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* TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
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*
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* T_SYM = 4 usec
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* 802.11a - 17.5.2: aSIFSTime = 16 usec
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* 802.11g - 19.8.4: aSIFSTime = 10 usec +
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* signal ext = 6 usec
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*/
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/* FIX: Atheros Turbo may have different (shorter) duration? */
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dur = 16; /* SIFS + signal ext */
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dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
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dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
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dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
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4 * rate); /* T_SYM x N_SYM */
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} else {
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/*
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* 802.11b or 802.11g with 802.11b compatibility:
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* 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
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* Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
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*
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* 802.11 (DS): 15.3.3, 802.11b: 18.3.4
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* aSIFSTime = 10 usec
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* aPreambleLength = 144 usec or 72 usec with short preamble
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* aPLCPHeaderLength = 48 usec or 24 usec with short preamble
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*/
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dur = 10; /* aSIFSTime = 10 usec */
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dur += short_preamble ? (72 + 24) : (144 + 48);
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dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
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}
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return dur;
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}
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/* Exported duration function for driver use */
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__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
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size_t frame_len, int rate)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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u16 dur;
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int erp;
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erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
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dur = ieee80211_frame_duration(local, frame_len, rate,
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erp, local->short_preamble);
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return cpu_to_le16(dur);
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}
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EXPORT_SYMBOL(ieee80211_generic_frame_duration);
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__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
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size_t frame_len,
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const struct ieee80211_tx_control *frame_txctl)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_rate *rate;
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int short_preamble = local->short_preamble;
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int erp;
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u16 dur;
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rate = frame_txctl->rts_rate;
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erp = !!(rate->flags & IEEE80211_RATE_ERP);
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/* CTS duration */
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dur = ieee80211_frame_duration(local, 10, rate->rate,
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erp, short_preamble);
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/* Data frame duration */
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dur += ieee80211_frame_duration(local, frame_len, rate->rate,
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erp, short_preamble);
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/* ACK duration */
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dur += ieee80211_frame_duration(local, 10, rate->rate,
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erp, short_preamble);
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return cpu_to_le16(dur);
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}
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EXPORT_SYMBOL(ieee80211_rts_duration);
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__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
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size_t frame_len,
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const struct ieee80211_tx_control *frame_txctl)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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struct ieee80211_rate *rate;
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int short_preamble = local->short_preamble;
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int erp;
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u16 dur;
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rate = frame_txctl->rts_rate;
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erp = !!(rate->flags & IEEE80211_RATE_ERP);
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/* Data frame duration */
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dur = ieee80211_frame_duration(local, frame_len, rate->rate,
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erp, short_preamble);
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if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
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/* ACK duration */
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dur += ieee80211_frame_duration(local, 10, rate->rate,
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erp, short_preamble);
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}
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return cpu_to_le16(dur);
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}
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EXPORT_SYMBOL(ieee80211_ctstoself_duration);
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struct ieee80211_rate *
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ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
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{
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struct ieee80211_hw_mode *mode;
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int r;
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list_for_each_entry(mode, &local->modes_list, list) {
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if (mode->mode != phymode)
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continue;
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for (r = 0; r < mode->num_rates; r++) {
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struct ieee80211_rate *rate = &mode->rates[r];
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if (rate->val == hw_rate ||
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(rate->flags & IEEE80211_RATE_PREAMBLE2 &&
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rate->val2 == hw_rate))
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return rate;
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}
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}
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return NULL;
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}
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void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
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&local->state[queue])) {
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if (test_bit(IEEE80211_LINK_STATE_PENDING,
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&local->state[queue]))
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tasklet_schedule(&local->tx_pending_tasklet);
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else
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if (!ieee80211_qdisc_installed(local->mdev)) {
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if (queue == 0)
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netif_wake_queue(local->mdev);
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} else
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__netif_schedule(local->mdev);
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}
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}
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EXPORT_SYMBOL(ieee80211_wake_queue);
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void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
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netif_stop_queue(local->mdev);
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set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
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}
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EXPORT_SYMBOL(ieee80211_stop_queue);
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void ieee80211_start_queues(struct ieee80211_hw *hw)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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int i;
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for (i = 0; i < local->hw.queues; i++)
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clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
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if (!ieee80211_qdisc_installed(local->mdev))
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netif_start_queue(local->mdev);
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}
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EXPORT_SYMBOL(ieee80211_start_queues);
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void ieee80211_stop_queues(struct ieee80211_hw *hw)
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{
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int i;
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for (i = 0; i < hw->queues; i++)
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ieee80211_stop_queue(hw, i);
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}
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EXPORT_SYMBOL(ieee80211_stop_queues);
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void ieee80211_wake_queues(struct ieee80211_hw *hw)
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{
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int i;
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for (i = 0; i < hw->queues; i++)
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ieee80211_wake_queue(hw, i);
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}
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EXPORT_SYMBOL(ieee80211_wake_queues);
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