[deliverable/linux.git] / net / mac80211 / util.c

/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.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.
 *
 * utilities for mac80211
 */

#include <net/mac80211.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/bitmap.h>
#include <net/net_namespace.h>
#include <net/cfg80211.h>
#include <net/rtnetlink.h>

#include "ieee80211_i.h"
#include "rate.h"
#include "mesh.h"
#include "wme.h"

/* privid for wiphys to determine whether they belong to us or not */
void *mac80211_wiphy_privid = &mac80211_wiphy_privid;

/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
const unsigned char rfc1042_header[] __aligned(2) =
	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
const unsigned char bridge_tunnel_header[] __aligned(2) =
	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };


u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
			enum nl80211_iftype type)
{
	__le16 fc = hdr->frame_control;

	 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
	if (len < 16)
		return NULL;

	if (ieee80211_is_data(fc)) {
		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;

		if (ieee80211_has_a4(fc))
			return NULL;
		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
			return hdr->addr2;

		return hdr->addr3;
	}

	if (ieee80211_is_mgmt(fc)) {
		if (len < 24) /* drop incorrect hdr len (mgmt) */
			return NULL;
		return hdr->addr3;
	}

	if (ieee80211_is_ctl(fc)) {
		if(ieee80211_is_pspoll(fc))
			return hdr->addr1;

		if (ieee80211_is_back_req(fc)) {
			switch (type) {
			case NL80211_IFTYPE_STATION:
				return hdr->addr2;
			case NL80211_IFTYPE_AP:
			case NL80211_IFTYPE_AP_VLAN:
				return hdr->addr1;
			default:
				break; /* fall through to the return */
			}
		}
	}

	return NULL;
}

unsigned int ieee80211_hdrlen(__le16 fc)
{
	unsigned int hdrlen = 24;

	if (ieee80211_is_data(fc)) {
		if (ieee80211_has_a4(fc))
			hdrlen = 30;
		if (ieee80211_is_data_qos(fc))
			hdrlen += IEEE80211_QOS_CTL_LEN;
		goto out;
	}

	if (ieee80211_is_ctl(fc)) {
		/*
		 * ACK and CTS are 10 bytes, all others 16. To see how
		 * to get this condition consider
		 *   subtype mask:   0b0000000011110000 (0x00F0)
		 *   ACK subtype:    0b0000000011010000 (0x00D0)
		 *   CTS subtype:    0b0000000011000000 (0x00C0)
		 *   bits that matter:         ^^^      (0x00E0)
		 *   value of those: 0b0000000011000000 (0x00C0)
		 */
		if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
			hdrlen = 10;
		else
			hdrlen = 16;
	}
out:
	return hdrlen;
}
EXPORT_SYMBOL(ieee80211_hdrlen);

unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
{
	const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
	unsigned int hdrlen;

	if (unlikely(skb->len < 10))
		return 0;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (unlikely(hdrlen > skb->len))
		return 0;
	return hdrlen;
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);

int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
{
	int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
	/* 7.1.3.5a.2 */
	switch (ae) {
	case 0:
		return 6;
	case 1:
		return 12;
	case 2:
		return 18;
	case 3:
		return 24;
	default:
		return 6;
	}
}

void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;

	hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	if (tx->extra_frag) {
		struct ieee80211_hdr *fhdr;
		int i;
		for (i = 0; i < tx->num_extra_frag; i++) {
			fhdr = (struct ieee80211_hdr *)
				tx->extra_frag[i]->data;
			fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
		}
	}
}

int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
			     int rate, int erp, int short_preamble)
{
	int dur;

	/* calculate duration (in microseconds, rounded up to next higher
	 * integer if it includes a fractional microsecond) to send frame of
	 * len bytes (does not include FCS) at the given rate. Duration will
	 * also include SIFS.
	 *
	 * rate is in 100 kbps, so divident is multiplied by 10 in the
	 * DIV_ROUND_UP() operations.
	 */

	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
		/*
		 * OFDM:
		 *
		 * N_DBPS = DATARATE x 4
		 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
		 *	(16 = SIGNAL time, 6 = tail bits)
		 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
		 *
		 * T_SYM = 4 usec
		 * 802.11a - 17.5.2: aSIFSTime = 16 usec
		 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
		 *	signal ext = 6 usec
		 */
		dur = 16; /* SIFS + signal ext */
		dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
		dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
		dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
					4 * rate); /* T_SYM x N_SYM */
	} else {
		/*
		 * 802.11b or 802.11g with 802.11b compatibility:
		 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
		 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
		 *
		 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
		 * aSIFSTime = 10 usec
		 * aPreambleLength = 144 usec or 72 usec with short preamble
		 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
		 */
		dur = 10; /* aSIFSTime = 10 usec */
		dur += short_preamble ? (72 + 24) : (144 + 48);

		dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
	}

	return dur;
}

/* Exported duration function for driver use */
__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif,
					size_t frame_len,
					struct ieee80211_rate *rate)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	u16 dur;
	int erp;

	erp = 0;
	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
		erp = rate->flags & IEEE80211_RATE_ERP_G;

	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
				       sdata->bss_conf.use_short_preamble);

	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_generic_frame_duration);

__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif, size_t frame_len,
			      const struct ieee80211_tx_info *frame_txctl)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	bool short_preamble;
	int erp;
	u16 dur;
	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

	short_preamble = sdata->bss_conf.use_short_preamble;

	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];

	erp = 0;
	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
		erp = rate->flags & IEEE80211_RATE_ERP_G;

	/* CTS duration */
	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
				       erp, short_preamble);
	/* Data frame duration */
	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
					erp, short_preamble);
	/* ACK duration */
	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
					erp, short_preamble);

	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_rts_duration);

__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
				    struct ieee80211_vif *vif,
				    size_t frame_len,
				    const struct ieee80211_tx_info *frame_txctl)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	bool short_preamble;
	int erp;
	u16 dur;
	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

	short_preamble = sdata->bss_conf.use_short_preamble;

	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
	erp = 0;
	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
		erp = rate->flags & IEEE80211_RATE_ERP_G;

	/* Data frame duration */
	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
				       erp, short_preamble);
	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
		/* ACK duration */
		dur += ieee80211_frame_duration(local, 10, rate->bitrate,
						erp, short_preamble);
	}

	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_ctstoself_duration);

void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);

	if (test_bit(queue, local->queues_pending)) {
		set_bit(queue, local->queues_pending_run);
		tasklet_schedule(&local->tx_pending_tasklet);
	} else {
		netif_wake_subqueue(local->mdev, queue);
	}
}
EXPORT_SYMBOL(ieee80211_wake_queue);

void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);

	netif_stop_subqueue(local->mdev, queue);
}
EXPORT_SYMBOL(ieee80211_stop_queue);

void ieee80211_stop_queues(struct ieee80211_hw *hw)
{
	int i;

	for (i = 0; i < ieee80211_num_queues(hw); i++)
		ieee80211_stop_queue(hw, i);
}
EXPORT_SYMBOL(ieee80211_stop_queues);

int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);
	return __netif_subqueue_stopped(local->mdev, queue);
}
EXPORT_SYMBOL(ieee80211_queue_stopped);

void ieee80211_wake_queues(struct ieee80211_hw *hw)
{
	int i;

	for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
		ieee80211_wake_queue(hw, i);
}
EXPORT_SYMBOL(ieee80211_wake_queues);

void ieee80211_iterate_active_interfaces(
	struct ieee80211_hw *hw,
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

	rtnl_lock();

	list_for_each_entry(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
		case __NL80211_IFTYPE_AFTER_LAST:
		case NL80211_IFTYPE_UNSPECIFIED:
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
			continue;
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
			break;
		}
		if (netif_running(sdata->dev))
			iterator(data, sdata->dev->dev_addr,
				 &sdata->vif);
	}

	rtnl_unlock();
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);

void ieee80211_iterate_active_interfaces_atomic(
	struct ieee80211_hw *hw,
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

	rcu_read_lock();

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
		case __NL80211_IFTYPE_AFTER_LAST:
		case NL80211_IFTYPE_UNSPECIFIED:
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
			continue;
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
			break;
		}
		if (netif_running(sdata->dev))
			iterator(data, sdata->dev->dev_addr,
				 &sdata->vif);
	}

	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);

void ieee802_11_parse_elems(u8 *start, size_t len,
			    struct ieee802_11_elems *elems)
{
	size_t left = len;
	u8 *pos = start;

	memset(elems, 0, sizeof(*elems));
	elems->ie_start = start;
	elems->total_len = len;

	while (left >= 2) {
		u8 id, elen;

		id = *pos++;
		elen = *pos++;
		left -= 2;

		if (elen > left)
			return;

		switch (id) {
		case WLAN_EID_SSID:
			elems->ssid = pos;
			elems->ssid_len = elen;
			break;
		case WLAN_EID_SUPP_RATES:
			elems->supp_rates = pos;
			elems->supp_rates_len = elen;
			break;
		case WLAN_EID_FH_PARAMS:
			elems->fh_params = pos;
			elems->fh_params_len = elen;
			break;
		case WLAN_EID_DS_PARAMS:
			elems->ds_params = pos;
			elems->ds_params_len = elen;
			break;
		case WLAN_EID_CF_PARAMS:
			elems->cf_params = pos;
			elems->cf_params_len = elen;
			break;
		case WLAN_EID_TIM:
			elems->tim = pos;
			elems->tim_len = elen;
			break;
		case WLAN_EID_IBSS_PARAMS:
			elems->ibss_params = pos;
			elems->ibss_params_len = elen;
			break;
		case WLAN_EID_CHALLENGE:
			elems->challenge = pos;
			elems->challenge_len = elen;
			break;
		case WLAN_EID_WPA:
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */
				if (pos[3] == 1) {
					/* OUI Type 1 - WPA IE */
					elems->wpa = pos;
					elems->wpa_len = elen;
				} else if (elen >= 5 && pos[3] == 2) {
					if (pos[4] == 0) {
						elems->wmm_info = pos;
						elems->wmm_info_len = elen;
					} else if (pos[4] == 1) {
						elems->wmm_param = pos;
						elems->wmm_param_len = elen;
					}
				}
			}
			break;
		case WLAN_EID_RSN:
			elems->rsn = pos;
			elems->rsn_len = elen;
			break;
		case WLAN_EID_ERP_INFO:
			elems->erp_info = pos;
			elems->erp_info_len = elen;
			break;
		case WLAN_EID_EXT_SUPP_RATES:
			elems->ext_supp_rates = pos;
			elems->ext_supp_rates_len = elen;
			break;
		case WLAN_EID_HT_CAPABILITY:
			elems->ht_cap_elem = pos;
			elems->ht_cap_elem_len = elen;
			break;
		case WLAN_EID_HT_EXTRA_INFO:
			elems->ht_info_elem = pos;
			elems->ht_info_elem_len = elen;
			break;
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
			elems->mesh_config = pos;
			elems->mesh_config_len = elen;
			break;
		case WLAN_EID_PEER_LINK:
			elems->peer_link = pos;
			elems->peer_link_len = elen;
			break;
		case WLAN_EID_PREQ:
			elems->preq = pos;
			elems->preq_len = elen;
			break;
		case WLAN_EID_PREP:
			elems->prep = pos;
			elems->prep_len = elen;
			break;
		case WLAN_EID_PERR:
			elems->perr = pos;
			elems->perr_len = elen;
			break;
		case WLAN_EID_CHANNEL_SWITCH:
			elems->ch_switch_elem = pos;
			elems->ch_switch_elem_len = elen;
			break;
		case WLAN_EID_QUIET:
			if (!elems->quiet_elem) {
				elems->quiet_elem = pos;
				elems->quiet_elem_len = elen;
			}
			elems->num_of_quiet_elem++;
			break;
		case WLAN_EID_COUNTRY:
			elems->country_elem = pos;
			elems->country_elem_len = elen;
			break;
		case WLAN_EID_PWR_CONSTRAINT:
			elems->pwr_constr_elem = pos;
			elems->pwr_constr_elem_len = elen;
			break;
		default:
			break;
		}

		left -= elen;
		pos += elen;
	}
}

void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
	int i;

	if (!local->ops->conf_tx)
		return;

	memset(&qparam, 0, sizeof(qparam));

	qparam.aifs = 2;

	if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
	    !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
		qparam.cw_min = 31;
	else
		qparam.cw_min = 15;

	qparam.cw_max = 1023;
	qparam.txop = 0;

	for (i = 0; i < local_to_hw(local)->queues; i++)
		local->ops->conf_tx(local_to_hw(local), i, &qparam);
}

void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		      int encrypt)
{
	skb->dev = sdata->local->mdev;
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

	skb->iif = sdata->dev->ifindex;
	skb->do_not_encrypt = !encrypt;

	dev_queue_xmit(skb);
}

int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
{
	int ret = -EINVAL;
	struct ieee80211_channel *chan;
	struct ieee80211_local *local = sdata->local;

	chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);

	if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
		if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
		    chan->flags & IEEE80211_CHAN_NO_IBSS) {
			printk(KERN_DEBUG "%s: IBSS not allowed on frequency "
				"%d MHz\n", sdata->dev->name, chan->center_freq);
			return ret;
		}
		local->oper_channel = chan;

		if (local->sw_scanning || local->hw_scanning)
			ret = 0;
		else
			ret = ieee80211_hw_config(local);

		rate_control_clear(local);
	}

	return ret;
}

u64 ieee80211_mandatory_rates(struct ieee80211_local *local,
			      enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
	u64 mandatory_rates;
	enum ieee80211_rate_flags mandatory_flag;
	int i;

	sband = local->hw.wiphy->bands[band];
	if (!sband) {
		WARN_ON(1);
		sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	}

	if (band == IEEE80211_BAND_2GHZ)
		mandatory_flag = IEEE80211_RATE_MANDATORY_B;
	else
		mandatory_flag = IEEE80211_RATE_MANDATORY_A;

	bitrates = sband->bitrates;
	mandatory_rates = 0;
	for (i = 0; i < sband->n_bitrates; i++)
		if (bitrates[i].flags & mandatory_flag)
			mandatory_rates |= BIT(i);
	return mandatory_rates;
}
Commit	Line	Data
c2d1560a JB	1	/*
	2	* Copyright 2002-2005, Instant802 Networks, Inc.
	3	* Copyright 2005-2006, Devicescape Software, Inc.
	4	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
	5	* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* utilities for mac80211
	12	*/
	13
	14	#include <net/mac80211.h>
	15	#include <linux/netdevice.h>
	16	#include <linux/types.h>
	17	#include <linux/slab.h>
	18	#include <linux/skbuff.h>
	19	#include <linux/etherdevice.h>
	20	#include <linux/if_arp.h>
	21	#include <linux/wireless.h>
	22	#include <linux/bitmap.h>
881d966b	23	#include <net/net_namespace.h>
c2d1560a	24	#include <net/cfg80211.h>
dabeb344	25	#include <net/rtnetlink.h>
c2d1560a JB	26
c2d1560a JB	27	#include "ieee80211_i.h"
2c8dccc7	28	#include "rate.h"
ee385855	29	#include "mesh.h"
c2d1560a JB	30	#include "wme.h"
	31
	32	/* privid for wiphys to determine whether they belong to us or not */
	33	void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
	34
	35	/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
	36	/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
c97c23e3	37	const unsigned char rfc1042_header[] __aligned(2) =
c2d1560a JB	38	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
	39
	40	/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
c97c23e3	41	const unsigned char bridge_tunnel_header[] __aligned(2) =
c2d1560a JB	42	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
c2d1560a JB	43
c2d1560a	44
71364716	45	u8 ieee80211_get_bssid(struct ieee80211_hdr hdr, size_t len,
05c914fe	46	enum nl80211_iftype type)
c2d1560a	47	{
a494bb1c	48	__le16 fc = hdr->frame_control;
c2d1560a	49
98f0b0a3 RR	50	/* drop ACK/CTS frames and incorrect hdr len (ctrl) */
98f0b0a3 RR	51	if (len < 16)
c2d1560a JB	52	return NULL;
c2d1560a JB	53
a494bb1c	54	if (ieee80211_is_data(fc)) {
98f0b0a3 RR	55	if (len < 24) /* drop incorrect hdr len (data) */
98f0b0a3 RR	56	return NULL;
a494bb1c HH	57
a494bb1c HH	58	if (ieee80211_has_a4(fc))
c2d1560a	59	return NULL;
a494bb1c HH	60	if (ieee80211_has_tods(fc))
	61	return hdr->addr1;
	62	if (ieee80211_has_fromds(fc))
c2d1560a	63	return hdr->addr2;
a494bb1c HH	64
	65	return hdr->addr3;
	66	}
	67
	68	if (ieee80211_is_mgmt(fc)) {
98f0b0a3 RR	69	if (len < 24) /* drop incorrect hdr len (mgmt) */
98f0b0a3 RR	70	return NULL;
c2d1560a	71	return hdr->addr3;
a494bb1c HH	72	}
	73
	74	if (ieee80211_is_ctl(fc)) {
	75	if(ieee80211_is_pspoll(fc))
c2d1560a	76	return hdr->addr1;
a494bb1c HH	77
a494bb1c HH	78	if (ieee80211_is_back_req(fc)) {
71364716	79	switch (type) {
05c914fe	80	case NL80211_IFTYPE_STATION:
71364716	81	return hdr->addr2;
05c914fe JB	82	case NL80211_IFTYPE_AP:
05c914fe JB	83	case NL80211_IFTYPE_AP_VLAN:
71364716 RR	84	return hdr->addr1;
71364716 RR	85	default:
a494bb1c	86	break; /* fall through to the return */
71364716 RR	87	}
71364716 RR	88	}
c2d1560a JB	89	}
	90
	91	return NULL;
	92	}
	93
6693be71 HH	94	unsigned int ieee80211_hdrlen(__le16 fc)
	95	{
	96	unsigned int hdrlen = 24;
	97
	98	if (ieee80211_is_data(fc)) {
	99	if (ieee80211_has_a4(fc))
	100	hdrlen = 30;
	101	if (ieee80211_is_data_qos(fc))
	102	hdrlen += IEEE80211_QOS_CTL_LEN;
	103	goto out;
	104	}
	105
	106	if (ieee80211_is_ctl(fc)) {
	107	/*
	108	* ACK and CTS are 10 bytes, all others 16. To see how
	109	* to get this condition consider
	110	* subtype mask: 0b0000000011110000 (0x00F0)
	111	* ACK subtype: 0b0000000011010000 (0x00D0)
	112	* CTS subtype: 0b0000000011000000 (0x00C0)
	113	* bits that matter: ^^^ (0x00E0)
	114	* value of those: 0b0000000011000000 (0x00C0)
	115	*/
	116	if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
	117	hdrlen = 10;
	118	else
	119	hdrlen = 16;
	120	}
	121	out:
	122	return hdrlen;
	123	}
	124	EXPORT_SYMBOL(ieee80211_hdrlen);
	125
c9c6950c	126	unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
c2d1560a	127	{
c9c6950c HH	128	const struct ieee80211_hdr hdr = (const struct ieee80211_hdr )skb->data;
c9c6950c HH	129	unsigned int hdrlen;
c2d1560a JB	130
	131	if (unlikely(skb->len < 10))
	132	return 0;
c9c6950c	133	hdrlen = ieee80211_hdrlen(hdr->frame_control);
c2d1560a JB	134	if (unlikely(hdrlen > skb->len))
	135	return 0;
	136	return hdrlen;
	137	}
	138	EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
	139
ee385855 LCC	140	int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
	141	{
	142	int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
	143	/* 7.1.3.5a.2 */
	144	switch (ae) {
	145	case 0:
ef269254	146	return 6;
ee385855	147	case 1:
ef269254	148	return 12;
ee385855	149	case 2:
ef269254	150	return 18;
ee385855	151	case 3:
ef269254	152	return 24;
ee385855	153	default:
ef269254	154	return 6;
ee385855 LCC	155	}
ee385855 LCC	156	}
ee385855	157
5cf121c3	158	void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
c2d1560a JB	159	{
	160	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) tx->skb->data;
	161
	162	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
5cf121c3	163	if (tx->extra_frag) {
c2d1560a JB	164	struct ieee80211_hdr *fhdr;
c2d1560a JB	165	int i;
5cf121c3	166	for (i = 0; i < tx->num_extra_frag; i++) {
c2d1560a	167	fhdr = (struct ieee80211_hdr *)
5cf121c3	168	tx->extra_frag[i]->data;
c2d1560a JB	169	fhdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	170	}
	171	}
	172	}
	173
	174	int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
	175	int rate, int erp, int short_preamble)
	176	{
	177	int dur;
	178
	179	/* calculate duration (in microseconds, rounded up to next higher
	180	* integer if it includes a fractional microsecond) to send frame of
	181	* len bytes (does not include FCS) at the given rate. Duration will
	182	* also include SIFS.
	183	*
	184	* rate is in 100 kbps, so divident is multiplied by 10 in the
	185	* DIV_ROUND_UP() operations.
	186	*/
	187
8318d78a	188	if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ \|\| erp) {
c2d1560a JB	189	/*
	190	* OFDM:
	191	*
	192	* N_DBPS = DATARATE x 4
	193	* N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
	194	* (16 = SIGNAL time, 6 = tail bits)
	195	* TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
	196	*
	197	* T_SYM = 4 usec
	198	* 802.11a - 17.5.2: aSIFSTime = 16 usec
	199	* 802.11g - 19.8.4: aSIFSTime = 10 usec +
	200	* signal ext = 6 usec
	201	*/
c2d1560a JB	202	dur = 16; /* SIFS + signal ext */
	203	dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
	204	dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
	205	dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
	206	4 * rate); /* T_SYM x N_SYM */
	207	} else {
	208	/*
	209	* 802.11b or 802.11g with 802.11b compatibility:
	210	* 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
	211	* Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
	212	*
	213	* 802.11 (DS): 15.3.3, 802.11b: 18.3.4
	214	* aSIFSTime = 10 usec
	215	* aPreambleLength = 144 usec or 72 usec with short preamble
	216	* aPLCPHeaderLength = 48 usec or 24 usec with short preamble
	217	*/
	218	dur = 10; /* aSIFSTime = 10 usec */
	219	dur += short_preamble ? (72 + 24) : (144 + 48);
	220
	221	dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
	222	}
	223
	224	return dur;
	225	}
	226
	227	/* Exported duration function for driver use */
32bfd35d JB	228	__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
32bfd35d JB	229	struct ieee80211_vif *vif,
8318d78a JB	230	size_t frame_len,
8318d78a JB	231	struct ieee80211_rate *rate)
c2d1560a JB	232	{
c2d1560a JB	233	struct ieee80211_local *local = hw_to_local(hw);
32bfd35d	234	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
c2d1560a JB	235	u16 dur;
	236	int erp;
	237
8318d78a JB	238	erp = 0;
	239	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	240	erp = rate->flags & IEEE80211_RATE_ERP_G;
	241
	242	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
471b3efd	243	sdata->bss_conf.use_short_preamble);
c2d1560a JB	244
	245	return cpu_to_le16(dur);
	246	}
	247	EXPORT_SYMBOL(ieee80211_generic_frame_duration);
	248
32bfd35d JB	249	__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
32bfd35d JB	250	struct ieee80211_vif *vif, size_t frame_len,
e039fa4a	251	const struct ieee80211_tx_info *frame_txctl)
c2d1560a JB	252	{
	253	struct ieee80211_local *local = hw_to_local(hw);
	254	struct ieee80211_rate *rate;
32bfd35d	255	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
471b3efd	256	bool short_preamble;
c2d1560a JB	257	int erp;
c2d1560a JB	258	u16 dur;
2e92e6f2 JB	259	struct ieee80211_supported_band *sband;
	260
	261	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
c2d1560a	262
471b3efd	263	short_preamble = sdata->bss_conf.use_short_preamble;
7e9ed188	264
e039fa4a	265	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
8318d78a JB	266
	267	erp = 0;
	268	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	269	erp = rate->flags & IEEE80211_RATE_ERP_G;
c2d1560a JB	270
c2d1560a JB	271	/* CTS duration */
8318d78a	272	dur = ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	273	erp, short_preamble);
c2d1560a JB	274	/* Data frame duration */
8318d78a	275	dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
c2d1560a JB	276	erp, short_preamble);
c2d1560a JB	277	/* ACK duration */
8318d78a	278	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	279	erp, short_preamble);
	280
	281	return cpu_to_le16(dur);
	282	}
	283	EXPORT_SYMBOL(ieee80211_rts_duration);
	284
32bfd35d JB	285	__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
32bfd35d JB	286	struct ieee80211_vif *vif,
c2d1560a	287	size_t frame_len,
e039fa4a	288	const struct ieee80211_tx_info *frame_txctl)
c2d1560a JB	289	{
	290	struct ieee80211_local *local = hw_to_local(hw);
	291	struct ieee80211_rate *rate;
32bfd35d	292	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
471b3efd	293	bool short_preamble;
c2d1560a JB	294	int erp;
c2d1560a JB	295	u16 dur;
2e92e6f2 JB	296	struct ieee80211_supported_band *sband;
	297
	298	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
c2d1560a	299
471b3efd	300	short_preamble = sdata->bss_conf.use_short_preamble;
7e9ed188	301
e039fa4a	302	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
8318d78a JB	303	erp = 0;
	304	if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
	305	erp = rate->flags & IEEE80211_RATE_ERP_G;
c2d1560a JB	306
c2d1560a JB	307	/* Data frame duration */
8318d78a	308	dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
c2d1560a	309	erp, short_preamble);
e039fa4a	310	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
c2d1560a	311	/* ACK duration */
8318d78a	312	dur += ieee80211_frame_duration(local, 10, rate->bitrate,
c2d1560a JB	313	erp, short_preamble);
	314	}
	315
	316	return cpu_to_le16(dur);
	317	}
	318	EXPORT_SYMBOL(ieee80211_ctstoself_duration);
	319
c2d1560a JB	320	void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
	321	{
	322	struct ieee80211_local *local = hw_to_local(hw);
	323
e2530083	324	if (test_bit(queue, local->queues_pending)) {
f8e79ddd	325	set_bit(queue, local->queues_pending_run);
e2530083 JB	326	tasklet_schedule(&local->tx_pending_tasklet);
e2530083 JB	327	} else {
51cb6db0	328	netif_wake_subqueue(local->mdev, queue);
c2d1560a JB	329	}
	330	}
	331	EXPORT_SYMBOL(ieee80211_wake_queue);
	332
	333	void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
	334	{
	335	struct ieee80211_local *local = hw_to_local(hw);
	336
51cb6db0	337	netif_stop_subqueue(local->mdev, queue);
c2d1560a JB	338	}
	339	EXPORT_SYMBOL(ieee80211_stop_queue);
	340
c2d1560a JB	341	void ieee80211_stop_queues(struct ieee80211_hw *hw)
	342	{
	343	int i;
	344
e2530083	345	for (i = 0; i < ieee80211_num_queues(hw); i++)
c2d1560a JB	346	ieee80211_stop_queue(hw, i);
	347	}
	348	EXPORT_SYMBOL(ieee80211_stop_queues);
	349
92ab8535 TW	350	int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
	351	{
	352	struct ieee80211_local *local = hw_to_local(hw);
	353	return __netif_subqueue_stopped(local->mdev, queue);
	354	}
	355	EXPORT_SYMBOL(ieee80211_queue_stopped);
	356
c2d1560a JB	357	void ieee80211_wake_queues(struct ieee80211_hw *hw)
	358	{
	359	int i;
	360
c4680470	361	for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
c2d1560a JB	362	ieee80211_wake_queue(hw, i);
	363	}
	364	EXPORT_SYMBOL(ieee80211_wake_queues);
dabeb344	365
32bfd35d JB	366	void ieee80211_iterate_active_interfaces(
	367	struct ieee80211_hw *hw,
	368	void (iterator)(void data, u8 *mac,
	369	struct ieee80211_vif *vif),
	370	void *data)
dabeb344 JB	371	{
	372	struct ieee80211_local *local = hw_to_local(hw);
	373	struct ieee80211_sub_if_data *sdata;
	374
2f561feb ID	375	rtnl_lock();
	376
	377	list_for_each_entry(sdata, &local->interfaces, list) {
	378	switch (sdata->vif.type) {
05c914fe JB	379	case __NL80211_IFTYPE_AFTER_LAST:
	380	case NL80211_IFTYPE_UNSPECIFIED:
	381	case NL80211_IFTYPE_MONITOR:
	382	case NL80211_IFTYPE_AP_VLAN:
2f561feb	383	continue;
05c914fe JB	384	case NL80211_IFTYPE_AP:
	385	case NL80211_IFTYPE_STATION:
	386	case NL80211_IFTYPE_ADHOC:
	387	case NL80211_IFTYPE_WDS:
	388	case NL80211_IFTYPE_MESH_POINT:
2f561feb ID	389	break;
2f561feb ID	390	}
2f561feb ID	391	if (netif_running(sdata->dev))
	392	iterator(data, sdata->dev->dev_addr,
	393	&sdata->vif);
	394	}
	395
	396	rtnl_unlock();
	397	}
	398	EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
	399
	400	void ieee80211_iterate_active_interfaces_atomic(
	401	struct ieee80211_hw *hw,
	402	void (iterator)(void data, u8 *mac,
	403	struct ieee80211_vif *vif),
	404	void *data)
	405	{
	406	struct ieee80211_local *local = hw_to_local(hw);
	407	struct ieee80211_sub_if_data *sdata;
	408
e38bad47	409	rcu_read_lock();
dabeb344	410
e38bad47	411	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
51fb61e7	412	switch (sdata->vif.type) {
05c914fe JB	413	case __NL80211_IFTYPE_AFTER_LAST:
	414	case NL80211_IFTYPE_UNSPECIFIED:
	415	case NL80211_IFTYPE_MONITOR:
	416	case NL80211_IFTYPE_AP_VLAN:
dabeb344	417	continue;
05c914fe JB	418	case NL80211_IFTYPE_AP:
	419	case NL80211_IFTYPE_STATION:
	420	case NL80211_IFTYPE_ADHOC:
	421	case NL80211_IFTYPE_WDS:
	422	case NL80211_IFTYPE_MESH_POINT:
dabeb344 JB	423	break;
dabeb344 JB	424	}
dabeb344 JB	425	if (netif_running(sdata->dev))
dabeb344 JB	426	iterator(data, sdata->dev->dev_addr,
32bfd35d	427	&sdata->vif);
dabeb344	428	}
e38bad47 JB	429
e38bad47 JB	430	rcu_read_unlock();
dabeb344	431	}
2f561feb	432	EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
37ffc8da JB	433
	434	void ieee802_11_parse_elems(u8 *start, size_t len,
	435	struct ieee802_11_elems *elems)
	436	{
	437	size_t left = len;
	438	u8 *pos = start;
	439
	440	memset(elems, 0, sizeof(*elems));
	441	elems->ie_start = start;
	442	elems->total_len = len;
	443
	444	while (left >= 2) {
	445	u8 id, elen;
	446
	447	id = *pos++;
	448	elen = *pos++;
	449	left -= 2;
	450
	451	if (elen > left)
	452	return;
	453
	454	switch (id) {
	455	case WLAN_EID_SSID:
	456	elems->ssid = pos;
	457	elems->ssid_len = elen;
	458	break;
	459	case WLAN_EID_SUPP_RATES:
	460	elems->supp_rates = pos;
	461	elems->supp_rates_len = elen;
	462	break;
	463	case WLAN_EID_FH_PARAMS:
	464	elems->fh_params = pos;
	465	elems->fh_params_len = elen;
	466	break;
	467	case WLAN_EID_DS_PARAMS:
	468	elems->ds_params = pos;
	469	elems->ds_params_len = elen;
	470	break;
	471	case WLAN_EID_CF_PARAMS:
	472	elems->cf_params = pos;
	473	elems->cf_params_len = elen;
	474	break;
	475	case WLAN_EID_TIM:
	476	elems->tim = pos;
	477	elems->tim_len = elen;
	478	break;
	479	case WLAN_EID_IBSS_PARAMS:
	480	elems->ibss_params = pos;
	481	elems->ibss_params_len = elen;
	482	break;
	483	case WLAN_EID_CHALLENGE:
	484	elems->challenge = pos;
	485	elems->challenge_len = elen;
	486	break;
	487	case WLAN_EID_WPA:
	488	if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
	489	pos[2] == 0xf2) {
	490	/* Microsoft OUI (00:50:F2) */
	491	if (pos[3] == 1) {
	492	/* OUI Type 1 - WPA IE */
	493	elems->wpa = pos;
	494	elems->wpa_len = elen;
	495	} else if (elen >= 5 && pos[3] == 2) {
	496	if (pos[4] == 0) {
497	elems->wmm_info = pos;
498	elems->wmm_info_len = elen;
499	} else if (pos[4] == 1) {
500	elems->wmm_param = pos;
501	elems->wmm_param_len = elen;
502	}
503	}
504	}
505	break;
506	case WLAN_EID_RSN:
507	elems->rsn = pos;
508	elems->rsn_len = elen;
509	break;
510	case WLAN_EID_ERP_INFO:
511	elems->erp_info = pos;
512	elems->erp_info_len = elen;
513	break;
514	case WLAN_EID_EXT_SUPP_RATES:
515	elems->ext_supp_rates = pos;
516	elems->ext_supp_rates_len = elen;
517	break;
518	case WLAN_EID_HT_CAPABILITY:
519	elems->ht_cap_elem = pos;
520	elems->ht_cap_elem_len = elen;
521	break;
522	case WLAN_EID_HT_EXTRA_INFO:
523	elems->ht_info_elem = pos;
524	elems->ht_info_elem_len = elen;
525	break;
526	case WLAN_EID_MESH_ID:
527	elems->mesh_id = pos;
528	elems->mesh_id_len = elen;
529	break;
530	case WLAN_EID_MESH_CONFIG:
531	elems->mesh_config = pos;
532	elems->mesh_config_len = elen;
533	break;
534	case WLAN_EID_PEER_LINK:
535	elems->peer_link = pos;
536	elems->peer_link_len = elen;
537	break;
538	case WLAN_EID_PREQ:
539	elems->preq = pos;
540	elems->preq_len = elen;
541	break;
542	case WLAN_EID_PREP:
543	elems->prep = pos;
544	elems->prep_len = elen;
545	break;
546	case WLAN_EID_PERR:
547	elems->perr = pos;
548	elems->perr_len = elen;
549	break;
550	case WLAN_EID_CHANNEL_SWITCH:
551	elems->ch_switch_elem = pos;
552	elems->ch_switch_elem_len = elen;
553	break;
554	case WLAN_EID_QUIET:
555	if (!elems->quiet_elem) {
556	elems->quiet_elem = pos;
557	elems->quiet_elem_len = elen;
558	}
559	elems->num_of_quiet_elem++;
560	break;
561	case WLAN_EID_COUNTRY:
562	elems->country_elem = pos;
563	elems->country_elem_len = elen;
564	break;
565	case WLAN_EID_PWR_CONSTRAINT:
566	elems->pwr_constr_elem = pos;
567	elems->pwr_constr_elem_len = elen;
568	break;
569	default:
570	break;
571	}
572
573	left -= elen;
574	pos += elen;
575	}
576	}
5825fe10 JB	577
	578	void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
	579	{
	580	struct ieee80211_local *local = sdata->local;
	581	struct ieee80211_tx_queue_params qparam;
	582	int i;
	583
	584	if (!local->ops->conf_tx)
	585	return;
	586
	587	memset(&qparam, 0, sizeof(qparam));
	588
	589	qparam.aifs = 2;
	590
	591	if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
	592	!(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
	593	qparam.cw_min = 31;
	594	else
	595	qparam.cw_min = 15;
	596
	597	qparam.cw_max = 1023;
	598	qparam.txop = 0;
	599
	600	for (i = 0; i < local_to_hw(local)->queues; i++)
	601	local->ops->conf_tx(local_to_hw(local), i, &qparam);
	602	}
e50db65c JB	603
	604	void ieee80211_tx_skb(struct ieee80211_sub_if_data sdata, struct sk_buff skb,
	605	int encrypt)
	606	{
	607	skb->dev = sdata->local->mdev;
	608	skb_set_mac_header(skb, 0);
	609	skb_set_network_header(skb, 0);
	610	skb_set_transport_header(skb, 0);
	611
	612	skb->iif = sdata->dev->ifindex;
	613	skb->do_not_encrypt = !encrypt;
	614
	615	dev_queue_xmit(skb);
	616	}
e16751c3 JB	617
	618	int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
	619	{
	620	int ret = -EINVAL;
	621	struct ieee80211_channel *chan;
	622	struct ieee80211_local *local = sdata->local;
	623
	624	chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
	625
	626	if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
05c914fe	627	if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
e16751c3 JB	628	chan->flags & IEEE80211_CHAN_NO_IBSS) {
	629	printk(KERN_DEBUG "%s: IBSS not allowed on frequency "
	630	"%d MHz\n", sdata->dev->name, chan->center_freq);
	631	return ret;
	632	}
	633	local->oper_channel = chan;
	634
c2b13452	635	if (local->sw_scanning \|\| local->hw_scanning)
e16751c3 JB	636	ret = 0;
	637	else
	638	ret = ieee80211_hw_config(local);
	639
	640	rate_control_clear(local);
	641	}
	642
	643	return ret;
	644	}
96dd22ac JB	645
	646	u64 ieee80211_mandatory_rates(struct ieee80211_local *local,
	647	enum ieee80211_band band)
	648	{
	649	struct ieee80211_supported_band *sband;
	650	struct ieee80211_rate *bitrates;
	651	u64 mandatory_rates;
	652	enum ieee80211_rate_flags mandatory_flag;
	653	int i;
	654
	655	sband = local->hw.wiphy->bands[band];
	656	if (!sband) {
	657	WARN_ON(1);
	658	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	659	}
	660
	661	if (band == IEEE80211_BAND_2GHZ)
	662	mandatory_flag = IEEE80211_RATE_MANDATORY_B;
	663	else
	664	mandatory_flag = IEEE80211_RATE_MANDATORY_A;
	665
	666	bitrates = sband->bitrates;
	667	mandatory_rates = 0;
	668	for (i = 0; i < sband->n_bitrates; i++)
	669	if (bitrates[i].flags & mandatory_flag)
	670	mandatory_rates \|= BIT(i);
	671	return mandatory_rates;
	672	}