ibss.c 47.7 KB
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/*
 * IBSS 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>
 * Copyright 2009, 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.
 */

#include <linux/delay.h>
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#include <linux/slab.h>
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#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 "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"

#define IEEE80211_SCAN_INTERVAL (2 * HZ)
#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)

#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
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#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)
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#define IEEE80211_IBSS_MAX_STA_ENTRIES 128

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static struct beacon_data *
ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata,
			   const int beacon_int, const u32 basic_rates,
			   const u16 capability, u64 tsf,
			   struct cfg80211_chan_def *chandef,
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			   bool *have_higher_than_11mbit,
			   struct cfg80211_csa_settings *csa_settings)
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{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct ieee80211_local *local = sdata->local;
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	int rates_n = 0, i, ri;
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	struct ieee80211_mgmt *mgmt;
	u8 *pos;
	struct ieee80211_supported_band *sband;
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	u32 rate_flags, rates = 0, rates_added = 0;
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	struct beacon_data *presp;
	int frame_len;
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	int shift;
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	/* Build IBSS probe response */
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	frame_len = sizeof(struct ieee80211_hdr_3addr) +
		    12 /* struct ieee80211_mgmt.u.beacon */ +
		    2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
		    2 + 8 /* max Supported Rates */ +
		    3 /* max DS params */ +
		    4 /* IBSS params */ +
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		    5 /* Channel Switch Announcement */ +
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		    2 + (IEEE80211_MAX_SUPP_RATES - 8) +
		    2 + sizeof(struct ieee80211_ht_cap) +
		    2 + sizeof(struct ieee80211_ht_operation) +
		    ifibss->ie_len;
	presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
	if (!presp)
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		return NULL;
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	presp->head = (void *)(presp + 1);

	mgmt = (void *) presp->head;
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	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_PROBE_RESP);
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	eth_broadcast_addr(mgmt->da);
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	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
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	memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
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	mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
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	mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
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	mgmt->u.beacon.capab_info = cpu_to_le16(capability);

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	pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable);

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	*pos++ = WLAN_EID_SSID;
	*pos++ = ifibss->ssid_len;
	memcpy(pos, ifibss->ssid, ifibss->ssid_len);
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	pos += ifibss->ssid_len;
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	sband = local->hw.wiphy->bands[chandef->chan->band];
	rate_flags = ieee80211_chandef_rate_flags(chandef);
	shift = ieee80211_chandef_get_shift(chandef);
	rates_n = 0;
	if (have_higher_than_11mbit)
		*have_higher_than_11mbit = false;

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	for (i = 0; i < sband->n_bitrates; i++) {
		if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
			continue;
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		if (sband->bitrates[i].bitrate > 110 &&
		    have_higher_than_11mbit)
			*have_higher_than_11mbit = true;
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		rates |= BIT(i);
		rates_n++;
	}

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	*pos++ = WLAN_EID_SUPP_RATES;
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	*pos++ = min_t(int, 8, rates_n);
	for (ri = 0; ri < sband->n_bitrates; ri++) {
		int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
					5 * (1 << shift));
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		u8 basic = 0;
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		if (!(rates & BIT(ri)))
			continue;

		if (basic_rates & BIT(ri))
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			basic = 0x80;
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		*pos++ = basic | (u8) rate;
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		if (++rates_added == 8) {
			ri++; /* continue at next rate for EXT_SUPP_RATES */
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			break;
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		}
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	}
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	if (sband->band == IEEE80211_BAND_2GHZ) {
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
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		*pos++ = ieee80211_frequency_to_channel(
				chandef->chan->center_freq);
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	}

	*pos++ = WLAN_EID_IBSS_PARAMS;
	*pos++ = 2;
	/* FIX: set ATIM window based on scan results */
	*pos++ = 0;
	*pos++ = 0;

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	if (csa_settings) {
		*pos++ = WLAN_EID_CHANNEL_SWITCH;
		*pos++ = 3;
		*pos++ = csa_settings->block_tx ? 1 : 0;
		*pos++ = ieee80211_frequency_to_channel(
				csa_settings->chandef.chan->center_freq);
		sdata->csa_counter_offset_beacon = (pos - presp->head);
		*pos++ = csa_settings->count;
	}

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	/* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */
	if (rates_n > 8) {
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		*pos++ = WLAN_EID_EXT_SUPP_RATES;
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		*pos++ = rates_n - 8;
		for (; ri < sband->n_bitrates; ri++) {
			int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate,
						5 * (1 << shift));
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			u8 basic = 0;
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			if (!(rates & BIT(ri)))
				continue;

			if (basic_rates & BIT(ri))
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				basic = 0x80;
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			*pos++ = basic | (u8) rate;
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		}
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	}

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	if (ifibss->ie_len) {
		memcpy(pos, ifibss->ie, ifibss->ie_len);
		pos += ifibss->ie_len;
	}
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	/* add HT capability and information IEs */
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	if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
	    chandef->width != NL80211_CHAN_WIDTH_5 &&
	    chandef->width != NL80211_CHAN_WIDTH_10 &&
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	    sband->ht_cap.ht_supported) {
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		struct ieee80211_sta_ht_cap ht_cap;

		memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
		ieee80211_apply_htcap_overrides(sdata, &ht_cap);

		pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap);
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		/*
		 * Note: According to 802.11n-2009 9.13.3.1, HT Protection
		 * field and RIFS Mode are reserved in IBSS mode, therefore
		 * keep them at 0
		 */
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		pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
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						 chandef, 0);
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	}

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	if (local->hw.queues >= IEEE80211_NUM_ACS) {
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		*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; /* U-APSD no in use */
	}

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	presp->head_len = pos - presp->head;
	if (WARN_ON(presp->head_len > frame_len))
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		goto error;

	return presp;
error:
	kfree(presp);
	return NULL;
}

static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
				      const u8 *bssid, const int beacon_int,
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				      struct cfg80211_chan_def *req_chandef,
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				      const u32 basic_rates,
				      const u16 capability, u64 tsf,
				      bool creator)
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct ieee80211_mgmt *mgmt;
	struct cfg80211_bss *bss;
	u32 bss_change;
	struct cfg80211_chan_def chandef;
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	struct ieee80211_channel *chan;
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	struct beacon_data *presp;
	enum nl80211_bss_scan_width scan_width;
	bool have_higher_than_11mbit;

	sdata_assert_lock(sdata);

	/* Reset own TSF to allow time synchronization work. */
	drv_reset_tsf(local, sdata);

	if (!ether_addr_equal(ifibss->bssid, bssid))
		sta_info_flush(sdata);

	/* if merging, indicate to driver that we leave the old IBSS */
	if (sdata->vif.bss_conf.ibss_joined) {
		sdata->vif.bss_conf.ibss_joined = false;
		sdata->vif.bss_conf.ibss_creator = false;
		sdata->vif.bss_conf.enable_beacon = false;
		netif_carrier_off(sdata->dev);
		ieee80211_bss_info_change_notify(sdata,
						 BSS_CHANGED_IBSS |
						 BSS_CHANGED_BEACON_ENABLED);
	}

	presp = rcu_dereference_protected(ifibss->presp,
					  lockdep_is_held(&sdata->wdev.mtx));
	rcu_assign_pointer(ifibss->presp, NULL);
	if (presp)
		kfree_rcu(presp, rcu_head);

	sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;

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	/* make a copy of the chandef, it could be modified below. */
	chandef = *req_chandef;
	chan = chandef.chan;
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	if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef)) {
		if (chandef.width == NL80211_CHAN_WIDTH_5 ||
		    chandef.width == NL80211_CHAN_WIDTH_10 ||
		    chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
		    chandef.width == NL80211_CHAN_WIDTH_20) {
			sdata_info(sdata,
				   "Failed to join IBSS, beacons forbidden\n");
			return;
		}
		chandef.width = NL80211_CHAN_WIDTH_20;
		chandef.center_freq1 = chan->center_freq;
	}

	ieee80211_vif_release_channel(sdata);
	if (ieee80211_vif_use_channel(sdata, &chandef,
				      ifibss->fixed_channel ?
					IEEE80211_CHANCTX_SHARED :
					IEEE80211_CHANCTX_EXCLUSIVE)) {
		sdata_info(sdata, "Failed to join IBSS, no channel context\n");
		return;
	}

	memcpy(ifibss->bssid, bssid, ETH_ALEN);

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

	presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates,
					   capability, tsf, &chandef,
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					   &have_higher_than_11mbit, NULL);
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	if (!presp)
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		return;

	rcu_assign_pointer(ifibss->presp, presp);
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	mgmt = (void *)presp->head;
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	sdata->vif.bss_conf.enable_beacon = true;
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	sdata->vif.bss_conf.beacon_int = beacon_int;
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	sdata->vif.bss_conf.basic_rates = basic_rates;
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	sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
	memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
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	bss_change = BSS_CHANGED_BEACON_INT;
	bss_change |= ieee80211_reset_erp_info(sdata);
	bss_change |= BSS_CHANGED_BSSID;
	bss_change |= BSS_CHANGED_BEACON;
	bss_change |= BSS_CHANGED_BEACON_ENABLED;
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	bss_change |= BSS_CHANGED_BASIC_RATES;
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	bss_change |= BSS_CHANGED_HT;
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	bss_change |= BSS_CHANGED_IBSS;
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	bss_change |= BSS_CHANGED_SSID;
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	/*
	 * In 5 GHz/802.11a, we can always use short slot time.
	 * (IEEE 802.11-2012 18.3.8.7)
	 *
	 * In 2.4GHz, we must always use long slots in IBSS for compatibility
	 * reasons.
	 * (IEEE 802.11-2012 19.4.5)
	 *
	 * HT follows these specifications (IEEE 802.11-2012 20.3.18)
	 */
	sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;
	bss_change |= BSS_CHANGED_ERP_SLOT;

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	/* cf. IEEE 802.11 9.2.12 */
	if (chan->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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	sdata->vif.bss_conf.ibss_joined = true;
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	sdata->vif.bss_conf.ibss_creator = creator;
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	ieee80211_bss_info_change_notify(sdata, bss_change);
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	ieee80211_set_wmm_default(sdata, true);
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	ifibss->state = IEEE80211_IBSS_MLME_JOINED;
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	mod_timer(&ifibss->timer,
		  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
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	scan_width = cfg80211_chandef_to_scan_width(&chandef);
	bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
					      scan_width, mgmt,
					      presp->head_len, 0, GFP_KERNEL);
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	cfg80211_put_bss(local->hw.wiphy, bss);
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	netif_carrier_on(sdata->dev);
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	cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
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}

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static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
				    struct ieee80211_bss *bss)
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{
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	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
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	struct ieee80211_supported_band *sband;
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	struct cfg80211_chan_def chandef;
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	u32 basic_rates;
	int i, j;
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	u16 beacon_int = cbss->beacon_interval;
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	const struct cfg80211_bss_ies *ies;
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	enum nl80211_channel_type chan_type;
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	u64 tsf;
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	u32 rate_flags;
	int shift;
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	sdata_assert_lock(sdata);
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	if (beacon_int < 10)
		beacon_int = 10;

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	switch (sdata->u.ibss.chandef.width) {
	case NL80211_CHAN_WIDTH_20_NOHT:
	case NL80211_CHAN_WIDTH_20:
	case NL80211_CHAN_WIDTH_40:
		chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef);
		cfg80211_chandef_create(&chandef, cbss->channel, chan_type);
		break;
	case NL80211_CHAN_WIDTH_5:
	case NL80211_CHAN_WIDTH_10:
		cfg80211_chandef_create(&chandef, cbss->channel,
					NL80211_CHAN_WIDTH_20_NOHT);
		chandef.width = sdata->u.ibss.chandef.width;
		break;
	default:
		/* fall back to 20 MHz for unsupported modes */
		cfg80211_chandef_create(&chandef, cbss->channel,
					NL80211_CHAN_WIDTH_20_NOHT);
		break;
	}

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	sband = sdata->local->hw.wiphy->bands[cbss->channel->band];
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	rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef);
	shift = ieee80211_vif_get_shift(&sdata->vif);
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	basic_rates = 0;

	for (i = 0; i < bss->supp_rates_len; i++) {
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		int rate = bss->supp_rates[i] & 0x7f;
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		bool is_basic = !!(bss->supp_rates[i] & 0x80);

		for (j = 0; j < sband->n_bitrates; j++) {
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			int brate;
			if ((rate_flags & sband->bitrates[j].flags)
			    != rate_flags)
				continue;

			brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
					     5 * (1 << shift));
			if (brate == rate) {
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				if (is_basic)
					basic_rates |= BIT(j);
				break;
			}
		}
	}

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	rcu_read_lock();
	ies = rcu_dereference(cbss->ies);
	tsf = ies->tsf;
	rcu_read_unlock();

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	__ieee80211_sta_join_ibss(sdata, cbss->bssid,
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				  beacon_int,
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				  &chandef,
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				  basic_rates,
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				  cbss->capability,
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				  tsf, false);
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}

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static int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
				     struct cfg80211_csa_settings *csa_settings)
{
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct ieee80211_local *local = sdata->local;
	int freq;
	int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
		      sizeof(mgmt->u.action.u.chan_switch);
	u8 *pos;

	skb = dev_alloc_skb(local->tx_headroom + hdr_len +
			    5 +	/* channel switch announcement element */
			    3);	/* secondary channel offset element */
	if (!skb)
		return -1;

	skb_reserve(skb, local->tx_headroom);
	mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
	memset(mgmt, 0, hdr_len);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_ACTION);

	eth_broadcast_addr(mgmt->da);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
	mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
	mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
	pos = skb_put(skb, 5);
	*pos++ = WLAN_EID_CHANNEL_SWITCH;			/* EID */
	*pos++ = 3;						/* IE length */
	*pos++ = csa_settings->block_tx ? 1 : 0;		/* CSA mode */
	freq = csa_settings->chandef.chan->center_freq;
	*pos++ = ieee80211_frequency_to_channel(freq);		/* channel */
	*pos++ = csa_settings->count;				/* count */

	if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
		enum nl80211_channel_type ch_type;

		skb_put(skb, 3);
		*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;	/* EID */
		*pos++ = 1;					/* IE length */
		ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
		if (ch_type == NL80211_CHAN_HT40PLUS)
			*pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
		else
			*pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
	}

	ieee80211_tx_skb(sdata, skb);
	return 0;
}

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int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata,
			      struct cfg80211_csa_settings *csa_settings)
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct beacon_data *presp, *old_presp;
	struct cfg80211_bss *cbss;
	const struct cfg80211_bss_ies *ies;
	u16 capability;
	u64 tsf;
	int ret = 0;

	sdata_assert_lock(sdata);

	capability = WLAN_CAPABILITY_IBSS;

	if (ifibss->privacy)
		capability |= WLAN_CAPABILITY_PRIVACY;

	cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan,
				ifibss->bssid, ifibss->ssid,
				ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
				WLAN_CAPABILITY_PRIVACY,
				capability);

	if (WARN_ON(!cbss)) {
		ret = -EINVAL;
		goto out;
	}

	rcu_read_lock();
	ies = rcu_dereference(cbss->ies);
	tsf = ies->tsf;
	rcu_read_unlock();
	cfg80211_put_bss(sdata->local->hw.wiphy, cbss);

	old_presp = rcu_dereference_protected(ifibss->presp,
					  lockdep_is_held(&sdata->wdev.mtx));

	presp = ieee80211_ibss_build_presp(sdata,
					   sdata->vif.bss_conf.beacon_int,
					   sdata->vif.bss_conf.basic_rates,
					   capability, tsf, &ifibss->chandef,
					   NULL, csa_settings);
	if (!presp) {
		ret = -ENOMEM;
		goto out;
	}

	rcu_assign_pointer(ifibss->presp, presp);
	if (old_presp)
		kfree_rcu(old_presp, rcu_head);

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	/* it might not send the beacon for a while. send an action frame
	 * immediately to announce the channel switch.
	 */
	if (csa_settings)
		ieee80211_send_action_csa(sdata, csa_settings);

543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 out:
	return ret;
}

int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct cfg80211_bss *cbss;
	int err;
	u16 capability;

	sdata_lock(sdata);
	/* update cfg80211 bss information with the new channel */
	if (!is_zero_ether_addr(ifibss->bssid)) {
		capability = WLAN_CAPABILITY_IBSS;

		if (ifibss->privacy)
			capability |= WLAN_CAPABILITY_PRIVACY;

		cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
					ifibss->chandef.chan,
					ifibss->bssid, ifibss->ssid,
					ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
					WLAN_CAPABILITY_PRIVACY,
					capability);
		/* XXX: should not really modify cfg80211 data */
		if (cbss) {
			cbss->channel = sdata->local->csa_chandef.chan;
			cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
		}
	}

	ifibss->chandef = sdata->local->csa_chandef;

	/* generate the beacon */
	err = ieee80211_ibss_csa_beacon(sdata, NULL);
	sdata_unlock(sdata);
	if (err < 0)
		return err;

	return 0;
}

void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

	cancel_work_sync(&ifibss->csa_connection_drop_work);
}

594
static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
595 596 597 598 599 600 601
	__acquires(RCU)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	u8 addr[ETH_ALEN];

	memcpy(addr, sta->sta.addr, ETH_ALEN);

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	ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr);
603

604 605
	sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
	sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
606 607 608 609
	/* authorize the station only if the network is not RSN protected. If
	 * not wait for the userspace to authorize it */
	if (!sta->sdata->u.ibss.control_port)
		sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
610 611 612 613 614 615 616 617 618 619

	rate_control_rate_init(sta);

	/* If it fails, maybe we raced another insertion? */
	if (sta_info_insert_rcu(sta))
		return sta_info_get(sdata, addr);
	return sta;
}

static struct sta_info *
620 621
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
		       const u8 *addr, u32 supp_rates)
622 623 624 625 626
	__acquires(RCU)
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
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627
	struct ieee80211_chanctx_conf *chanctx_conf;
628
	struct ieee80211_supported_band *sband;
629
	enum nl80211_bss_scan_width scan_width;
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630
	int band;
631 632 633 634 635 636

	/*
	 * XXX: Consider removing the least recently used entry and
	 * 	allow new one to be added.
	 */
	if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
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637
		net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
638
				    sdata->name, addr);
639 640 641 642 643 644 645 646 647
		rcu_read_lock();
		return NULL;
	}

	if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
		rcu_read_lock();
		return NULL;
	}

648
	if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) {
649 650 651 652
		rcu_read_lock();
		return NULL;
	}

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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON_ONCE(!chanctx_conf))
		return NULL;
657
	band = chanctx_conf->def.chan->band;
658
	scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
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	rcu_read_unlock();

661 662 663 664 665 666 667 668 669
	sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
	if (!sta) {
		rcu_read_lock();
		return NULL;
	}

	sta->last_rx = jiffies;

	/* make sure mandatory rates are always added */
670
	sband = local->hw.wiphy->bands[band];
671
	sta->sta.supp_rates[band] = supp_rates |
672
			ieee80211_mandatory_rates(sband, scan_width);
673

674
	return ieee80211_ibss_finish_sta(sta);
675 676
}

677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	int active = 0;
	struct sta_info *sta;

	sdata_assert_lock(sdata);

	rcu_read_lock();

	list_for_each_entry_rcu(sta, &local->sta_list, list) {
		if (sta->sdata == sdata &&
		    time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL,
			       jiffies)) {
			active++;
			break;
		}
	}

	rcu_read_unlock();

	return active;
}

static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct ieee80211_local *local = sdata->local;
	struct cfg80211_bss *cbss;
	struct beacon_data *presp;
	struct sta_info *sta;
	int active_ibss;
	u16 capability;

	active_ibss = ieee80211_sta_active_ibss(sdata);

	if (!active_ibss && !is_zero_ether_addr(ifibss->bssid)) {
		capability = WLAN_CAPABILITY_IBSS;

		if (ifibss->privacy)
			capability |= WLAN_CAPABILITY_PRIVACY;

		cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan,
					ifibss->bssid, ifibss->ssid,
					ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
					WLAN_CAPABILITY_PRIVACY,
					capability);

		if (cbss) {
			cfg80211_unlink_bss(local->hw.wiphy, cbss);
			cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
		}
	}

	ifibss->state = IEEE80211_IBSS_MLME_SEARCH;

	sta_info_flush(sdata);

	spin_lock_bh(&ifibss->incomplete_lock);
	while (!list_empty(&ifibss->incomplete_stations)) {
		sta = list_first_entry(&ifibss->incomplete_stations,
				       struct sta_info, list);
		list_del(&sta->list);
		spin_unlock_bh(&ifibss->incomplete_lock);

		sta_info_free(local, sta);
		spin_lock_bh(&ifibss->incomplete_lock);
	}
	spin_unlock_bh(&ifibss->incomplete_lock);

	netif_carrier_off(sdata->dev);

	sdata->vif.bss_conf.ibss_joined = false;
	sdata->vif.bss_conf.ibss_creator = false;
	sdata->vif.bss_conf.enable_beacon = false;
	sdata->vif.bss_conf.ssid_len = 0;

	/* remove beacon */
	presp = rcu_dereference_protected(ifibss->presp,
					  lockdep_is_held(&sdata->wdev.mtx));
	RCU_INIT_POINTER(sdata->u.ibss.presp, NULL);
	if (presp)
		kfree_rcu(presp, rcu_head);

	clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
						BSS_CHANGED_IBSS);
	ieee80211_vif_release_channel(sdata);
}

767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964
static void ieee80211_csa_connection_drop_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
			     u.ibss.csa_connection_drop_work);

	ieee80211_ibss_disconnect(sdata);
	synchronize_rcu();
	skb_queue_purge(&sdata->skb_queue);

	/* trigger a scan to find another IBSS network to join */
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
}

static bool
ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				  struct ieee802_11_elems *elems,
				  bool beacon)
{
	struct cfg80211_csa_settings params;
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_chanctx *chanctx;
	enum nl80211_channel_type ch_type;
	int err, num_chanctx;
	u32 sta_flags;
	u8 mode;

	if (sdata->vif.csa_active)
		return true;

	if (!sdata->vif.bss_conf.ibss_joined)
		return false;

	sta_flags = IEEE80211_STA_DISABLE_VHT;
	switch (ifibss->chandef.width) {
	case NL80211_CHAN_WIDTH_5:
	case NL80211_CHAN_WIDTH_10:
	case NL80211_CHAN_WIDTH_20_NOHT:
		sta_flags |= IEEE80211_STA_DISABLE_HT;
		/* fall through */
	case NL80211_CHAN_WIDTH_20:
		sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
		break;
	default:
		break;
	}

	memset(&params, 0, sizeof(params));
	err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon,
					   ifibss->chandef.chan->band,
					   sta_flags, ifibss->bssid,
					   &params.count, &mode,
					   &params.chandef);

	/* can't switch to destination channel, fail */
	if (err < 0)
		goto disconnect;

	/* did not contain a CSA */
	if (err)
		return false;

	if (ifibss->chandef.chan->band != params.chandef.chan->band)
		goto disconnect;

	switch (ifibss->chandef.width) {
	case NL80211_CHAN_WIDTH_20_NOHT:
	case NL80211_CHAN_WIDTH_20:
	case NL80211_CHAN_WIDTH_40:
		/* keep our current HT mode (HT20/HT40+/HT40-), even if
		 * another mode  has been announced. The mode is not adopted
		 * within the beacon while doing CSA and we should therefore
		 * keep the mode which we announce.
		 */
		ch_type = cfg80211_get_chandef_type(&ifibss->chandef);
		cfg80211_chandef_create(&params.chandef, params.chandef.chan,
					ch_type);
		break;
	case NL80211_CHAN_WIDTH_5:
	case NL80211_CHAN_WIDTH_10:
		if (params.chandef.width != ifibss->chandef.width) {
			sdata_info(sdata,
				   "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
				   ifibss->bssid,
				   params.chandef.chan->center_freq,
				   params.chandef.width,
				   params.chandef.center_freq1,
				   params.chandef.center_freq2);
			goto disconnect;
		}
		break;
	default:
		/* should not happen, sta_flags should prevent VHT modes. */
		WARN_ON(1);
		goto disconnect;
	}

	if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
			   ifibss->bssid,
			   params.chandef.chan->center_freq,
			   params.chandef.width,
			   params.chandef.center_freq1,
			   params.chandef.center_freq2);
		goto disconnect;
	}

	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
					    &params.chandef);
	if (err < 0)
		goto disconnect;
	if (err) {
		params.radar_required = true;

		/* TODO: IBSS-DFS not (yet) supported, disconnect. */
		goto disconnect;
	}

	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
		goto disconnect;
	}

	/* don't handle for multi-VIF cases */
	chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
	if (chanctx->refcount > 1) {
		rcu_read_unlock();
		goto disconnect;
	}
	num_chanctx = 0;
	list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
		num_chanctx++;

	if (num_chanctx > 1) {
		rcu_read_unlock();
		goto disconnect;
	}
	rcu_read_unlock();

	/* all checks done, now perform the channel switch. */
	ibss_dbg(sdata,
		 "received channel switch announcement to go to channel %d MHz\n",
		 params.chandef.chan->center_freq);

	params.block_tx = !!mode;

	ieee80211_ibss_csa_beacon(sdata, &params);
	sdata->csa_radar_required = params.radar_required;

	if (params.block_tx)
		ieee80211_stop_queues_by_reason(&sdata->local->hw,
				IEEE80211_MAX_QUEUE_MAP,
				IEEE80211_QUEUE_STOP_REASON_CSA);

	sdata->local->csa_chandef = params.chandef;
	sdata->vif.csa_active = true;

	ieee80211_bss_info_change_notify(sdata, err);
	drv_channel_switch_beacon(sdata, &params.chandef);

	return true;
disconnect:
	ibss_dbg(sdata, "Can't handle channel switch, disconnect\n");
	ieee80211_queue_work(&sdata->local->hw,
			     &ifibss->csa_connection_drop_work);

	return true;
}

static void
ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata,
				struct ieee80211_mgmt *mgmt, size_t len,
				struct ieee80211_rx_status *rx_status,
				struct ieee802_11_elems *elems)
{
	int required_len;

	if (len < IEEE80211_MIN_ACTION_SIZE + 1)
		return;

	/* CSA is the only action we handle for now */
	if (mgmt->u.action.u.measurement.action_code !=
	    WLAN_ACTION_SPCT_CHL_SWITCH)
		return;

	required_len = IEEE80211_MIN_ACTION_SIZE +
		       sizeof(mgmt->u.action.u.chan_switch);
	if (len < required_len)
		return;

	ieee80211_ibss_process_chanswitch(sdata, elems, false);
}

965 966 967 968 969 970 971 972 973 974 975 976 977 978
static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata,
					  struct ieee80211_mgmt *mgmt,
					  size_t len)
{
	u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code);

	if (len < IEEE80211_DEAUTH_FRAME_LEN)
		return;

	ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM BSSID=%pM (reason: %d)\n",
		 mgmt->sa, mgmt->da, mgmt->bssid, reason);
	sta_info_destroy_addr(sdata, mgmt->sa);
}

979 980 981 982 983 984
static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
					struct ieee80211_mgmt *mgmt,
					size_t len)
{
	u16 auth_alg, auth_transaction;

985
	sdata_assert_lock(sdata);
986 987 988 989 990 991 992

	if (len < 24 + 6)
		return;

	auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
	auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);

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Johannes Berg 已提交
993 994 995
	ibss_dbg(sdata,
		 "RX Auth SA=%pM DA=%pM BSSID=%pM (auth_transaction=%d)\n",
		 mgmt->sa, mgmt->da, mgmt->bssid, auth_transaction);
996 997 998 999

	if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
		return;

1000 1001 1002 1003 1004 1005
	/*
	 * IEEE 802.11 standard does not require authentication in IBSS
	 * networks and most implementations do not seem to use it.
	 * However, try to reply to authentication attempts if someone
	 * has actually implemented this.
	 */
1006
	ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0,
1007
			    mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0);
1008 1009
}

1010
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1011
				  struct ieee80211_mgmt *mgmt, size_t len,
1012
				  struct ieee80211_rx_status *rx_status,
1013
				  struct ieee802_11_elems *elems)
1014 1015 1016
{
	struct ieee80211_local *local = sdata->local;
	int freq;
1017
	struct cfg80211_bss *cbss;
1018 1019 1020 1021 1022 1023
	struct ieee80211_bss *bss;
	struct sta_info *sta;
	struct ieee80211_channel *channel;
	u64 beacon_timestamp, rx_timestamp;
	u32 supp_rates = 0;
	enum ieee80211_band band = rx_status->band;
1024
	enum nl80211_bss_scan_width scan_width;
1025 1026
	struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
	bool rates_updated = false;
1027

1028
	if (elems->ds_params)
1029 1030
		freq = ieee80211_channel_to_frequency(elems->ds_params[0],
						      band);
1031 1032 1033 1034 1035 1036 1037 1038
	else
		freq = rx_status->freq;

	channel = ieee80211_get_channel(local->hw.wiphy, freq);

	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
		return;

1039
	if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1040
	    ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) {
1041 1042

		rcu_read_lock();
1043
		sta = sta_info_get(sdata, mgmt->sa);
1044

1045
		if (elems->supp_rates) {
1046
			supp_rates = ieee80211_sta_get_rates(sdata, elems,
1047
							     band, NULL);
1048 1049 1050 1051 1052
			if (sta) {
				u32 prev_rates;

				prev_rates = sta->sta.supp_rates[band];
				/* make sure mandatory rates are always added */
1053 1054 1055 1056 1057
				scan_width = NL80211_BSS_CHAN_WIDTH_20;
				if (rx_status->flag & RX_FLAG_5MHZ)
					scan_width = NL80211_BSS_CHAN_WIDTH_5;
				if (rx_status->flag & RX_FLAG_10MHZ)
					scan_width = NL80211_BSS_CHAN_WIDTH_10;
1058

1059 1060 1061
				sta->sta.supp_rates[band] = supp_rates |
					ieee80211_mandatory_rates(sband,
								  scan_width);
1062
				if (sta->sta.supp_rates[band] != prev_rates) {
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Johannes Berg 已提交
1063 1064 1065 1066
					ibss_dbg(sdata,
						 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
						 sta->sta.addr, prev_rates,
						 sta->sta.supp_rates[band]);
1067
					rates_updated = true;
1068
				}
1069 1070
			} else {
				rcu_read_unlock();
1071
				sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
1072
						mgmt->sa, supp_rates);
1073
			}
1074
		}
1075 1076

		if (sta && elems->wmm_info)
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Johannes Berg 已提交
1077
			set_sta_flag(sta, WLAN_STA_WME);
1078

1079
		if (sta && elems->ht_operation && elems->ht_cap_elem &&
1080 1081 1082
		    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
		    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 &&
		    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) {
1083
			/* we both use HT */
1084
			struct ieee80211_ht_cap htcap_ie;
1085 1086 1087 1088 1089
			struct cfg80211_chan_def chandef;

			ieee80211_ht_oper_to_chandef(channel,
						     elems->ht_operation,
						     &chandef);
1090

1091
			memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie));
1092 1093 1094 1095 1096

			/*
			 * fall back to HT20 if we don't use or use
			 * the other extension channel
			 */
1097 1098
			if (chandef.center_freq1 !=
			    sdata->u.ibss.chandef.center_freq1)
1099 1100 1101 1102 1103
				htcap_ie.cap_info &=
					cpu_to_le16(~IEEE80211_HT_CAP_SUP_WIDTH_20_40);

			rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(
						sdata, sband, &htcap_ie, sta);
1104 1105
		}

1106 1107 1108
		if (sta && rates_updated) {
			drv_sta_rc_update(local, sdata, &sta->sta,
					  IEEE80211_RC_SUPP_RATES_CHANGED);
1109
			rate_control_rate_init(sta);
1110
		}
1111

1112
		rcu_read_unlock();
1113 1114 1115
	}

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1116
					channel);
1117 1118 1119
	if (!bss)
		return;

1120 1121
	cbss = container_of((void *)bss, struct cfg80211_bss, priv);

J
Johannes Berg 已提交
1122 1123
	/* same for beacon and probe response */
	beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1124 1125 1126 1127

	/* check if we need to merge IBSS */

	/* not an IBSS */
1128
	if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
1129 1130 1131
		goto put_bss;

	/* different channel */
J
Johannes Berg 已提交
1132
	if (sdata->u.ibss.fixed_channel &&
1133
	    sdata->u.ibss.chandef.chan != cbss->channel)
1134 1135 1136 1137 1138 1139 1140 1141
		goto put_bss;

	/* different SSID */
	if (elems->ssid_len != sdata->u.ibss.ssid_len ||
	    memcmp(elems->ssid, sdata->u.ibss.ssid,
				sdata->u.ibss.ssid_len))
		goto put_bss;

1142 1143 1144 1145
	/* process channel switch */
	if (ieee80211_ibss_process_chanswitch(sdata, elems, true))
		goto put_bss;

1146
	/* same BSSID */
1147
	if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid))
1148 1149
		goto put_bss;

1150 1151 1152 1153
	/* we use a fixed BSSID */
	if (sdata->u.ibss.fixed_bssid)
		goto put_bss;

1154 1155 1156 1157 1158
	if (ieee80211_have_rx_timestamp(rx_status)) {
		/* time when timestamp field was received */
		rx_timestamp =
			ieee80211_calculate_rx_timestamp(local, rx_status,
							 len + FCS_LEN, 24);
1159 1160 1161 1162 1163
	} else {
		/*
		 * second best option: get current TSF
		 * (will return -1 if not supported)
		 */
1164
		rx_timestamp = drv_get_tsf(local, sdata);
1165
	}
1166

J
Johannes Berg 已提交
1167 1168 1169 1170 1171 1172 1173
	ibss_dbg(sdata,
		 "RX beacon SA=%pM BSSID=%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
		 mgmt->sa, mgmt->bssid,
		 (unsigned long long)rx_timestamp,
		 (unsigned long long)beacon_timestamp,
		 (unsigned long long)(rx_timestamp - beacon_timestamp),
		 jiffies);
1174 1175

	if (beacon_timestamp > rx_timestamp) {
J
Johannes Berg 已提交
1176 1177 1178
		ibss_dbg(sdata,
			 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n",
			 mgmt->bssid);
1179
		ieee80211_sta_join_ibss(sdata, bss);
1180
		supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL);
1181
		ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
1182
				       supp_rates);
1183
		rcu_read_unlock();
1184 1185 1186 1187 1188 1189
	}

 put_bss:
	ieee80211_rx_bss_put(local, bss);
}

1190 1191 1192
void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
			      const u8 *bssid, const u8 *addr,
			      u32 supp_rates)
1193
{
1194
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1195 1196
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
J
Johannes Berg 已提交
1197
	struct ieee80211_chanctx_conf *chanctx_conf;
1198
	struct ieee80211_supported_band *sband;
1199
	enum nl80211_bss_scan_width scan_width;
J
Johannes Berg 已提交
1200
	int band;
1201

1202 1203 1204 1205
	/*
	 * XXX: Consider removing the least recently used entry and
	 * 	allow new one to be added.
	 */
1206
	if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
J
Johannes Berg 已提交
1207
		net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n",
1208
				    sdata->name, addr);
1209
		return;
1210 1211
	}

1212
	if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
1213
		return;
1214

1215
	if (!ether_addr_equal(bssid, sdata->u.ibss.bssid))
1216
		return;
1217

J
Johannes Berg 已提交
1218 1219 1220 1221 1222 1223
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON_ONCE(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
1224
	band = chanctx_conf->def.chan->band;
1225
	scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
J
Johannes Berg 已提交
1226 1227
	rcu_read_unlock();

1228
	sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
1229
	if (!sta)
1230
		return;
1231

1232
	sta->last_rx = jiffies;
1233

1234
	/* make sure mandatory rates are always added */
1235
	sband = local->hw.wiphy->bands[band];
1236
	sta->sta.supp_rates[band] = supp_rates |
1237
			ieee80211_mandatory_rates(sband, scan_width);
1238

1239 1240 1241 1242
	spin_lock(&ifibss->incomplete_lock);
	list_add(&sta->list, &ifibss->incomplete_stations);
	spin_unlock(&ifibss->incomplete_lock);
	ieee80211_queue_work(&local->hw, &sdata->work);
1243 1244
}

1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta, *tmp;
	unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
	unsigned long exp_rsn_time = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT;

	mutex_lock(&local->sta_mtx);

	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
		if (sdata != sta->sdata)
			continue;

		if (time_after(jiffies, sta->last_rx + exp_time) ||
		    (time_after(jiffies, sta->last_rx + exp_rsn_time) &&
		     sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
			sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
				sta->sta_state != IEEE80211_STA_AUTHORIZED ?
				"not authorized " : "", sta->sta.addr);

			WARN_ON(__sta_info_destroy(sta));
		}
	}

	mutex_unlock(&local->sta_mtx);
}

1272 1273 1274
/*
 * This function is called with state == IEEE80211_IBSS_MLME_JOINED
 */
1275 1276 1277 1278

static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1279
	enum nl80211_bss_scan_width scan_width;
1280

1281
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
1282

1283 1284
	mod_timer(&ifibss->timer,
		  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
1285

1286
	ieee80211_ibss_sta_expire(sdata);
1287

S
Sujith 已提交
1288 1289 1290 1291
	if (time_before(jiffies, ifibss->last_scan_completed +
		       IEEE80211_IBSS_MERGE_INTERVAL))
		return;

1292 1293 1294
	if (ieee80211_sta_active_ibss(sdata))
		return;

1295
	if (ifibss->fixed_channel)
1296 1297
		return;

J
Johannes Berg 已提交
1298 1299
	sdata_info(sdata,
		   "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
1300

1301
	scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
S
Stanislaw Gruszka 已提交
1302
	ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
1303
				    NULL, scan_width);
1304 1305
}

1306
static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
1307 1308 1309 1310 1311 1312
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	u8 bssid[ETH_ALEN];
	u16 capability;
	int i;

1313
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
1314

1315
	if (ifibss->fixed_bssid) {
1316 1317 1318 1319 1320 1321 1322
		memcpy(bssid, ifibss->bssid, ETH_ALEN);
	} else {
		/* Generate random, not broadcast, locally administered BSSID. Mix in
		 * own MAC address to make sure that devices that do not have proper
		 * random number generator get different BSSID. */
		get_random_bytes(bssid, ETH_ALEN);
		for (i = 0; i < ETH_ALEN; i++)
1323
			bssid[i] ^= sdata->vif.addr[i];
1324 1325 1326 1327
		bssid[0] &= ~0x01;
		bssid[0] |= 0x02;
	}

J
Johannes Berg 已提交
1328
	sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid);
1329 1330 1331

	capability = WLAN_CAPABILITY_IBSS;

J
Johannes Berg 已提交
1332
	if (ifibss->privacy)
1333 1334 1335 1336
		capability |= WLAN_CAPABILITY_PRIVACY;
	else
		sdata->drop_unencrypted = 0;

1337
	__ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
1338
				  &ifibss->chandef, ifibss->basic_rates,
1339
				  capability, 0, true);
1340 1341
}

1342 1343 1344 1345
/*
 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH
 */

1346
static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
1347 1348 1349
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct ieee80211_local *local = sdata->local;
1350
	struct cfg80211_bss *cbss;
1351
	struct ieee80211_channel *chan = NULL;
1352
	const u8 *bssid = NULL;
1353
	enum nl80211_bss_scan_width scan_width;
1354
	int active_ibss;
1355
	u16 capability;
1356

1357
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
1358

1359
	active_ibss = ieee80211_sta_active_ibss(sdata);
J
Johannes Berg 已提交
1360
	ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss);
1361 1362

	if (active_ibss)
1363
		return;
1364

1365
	capability = WLAN_CAPABILITY_IBSS;
J
Johannes Berg 已提交
1366
	if (ifibss->privacy)
1367
		capability |= WLAN_CAPABILITY_PRIVACY;
1368 1369 1370
	if (ifibss->fixed_bssid)
		bssid = ifibss->bssid;
	if (ifibss->fixed_channel)
1371
		chan = ifibss->chandef.chan;
1372
	if (!is_zero_ether_addr(ifibss->bssid))
1373
		bssid = ifibss->bssid;
1374 1375 1376 1377 1378 1379 1380
	cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
				ifibss->ssid, ifibss->ssid_len,
				WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
				capability);

	if (cbss) {
		struct ieee80211_bss *bss;
1381

1382
		bss = (void *)cbss->priv;
J
Johannes Berg 已提交
1383 1384 1385 1386 1387 1388
		ibss_dbg(sdata,
			 "sta_find_ibss: selected %pM current %pM\n",
			 cbss->bssid, ifibss->bssid);
		sdata_info(sdata,
			   "Selected IBSS BSSID %pM based on configured SSID\n",
			   cbss->bssid);
1389

1390
		ieee80211_sta_join_ibss(sdata, bss);
1391
		ieee80211_rx_bss_put(local, bss);
1392
		return;
R
Reinette Chatre 已提交
1393
	}
1394

1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
	/* if a fixed bssid and a fixed freq have been provided create the IBSS
	 * directly and do not waste time scanning
	 */
	if (ifibss->fixed_bssid && ifibss->fixed_channel) {
		sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n",
			   bssid);
		ieee80211_sta_create_ibss(sdata);
		return;
	}


J
Johannes Berg 已提交
1406
	ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n");
1407 1408

	/* Selected IBSS not found in current scan results - try to scan */
1409
	if (time_after(jiffies, ifibss->last_scan_completed +
1410
					IEEE80211_SCAN_INTERVAL)) {
J
Johannes Berg 已提交
1411
		sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
1412

1413
		scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
S
Stanislaw Gruszka 已提交
1414
		ieee80211_request_ibss_scan(sdata, ifibss->ssid,
1415 1416
					    ifibss->ssid_len, chan,
					    scan_width);
1417
	} else {
1418 1419 1420
		int interval = IEEE80211_SCAN_INTERVAL;

		if (time_after(jiffies, ifibss->ibss_join_req +
J
Johannes Berg 已提交
1421 1422
			       IEEE80211_IBSS_JOIN_TIMEOUT))
			ieee80211_sta_create_ibss(sdata);
1423

1424 1425
		mod_timer(&ifibss->timer,
			  round_jiffies(jiffies + interval));
1426 1427 1428 1429
	}
}

static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
1430
					struct sk_buff *req)
1431
{
1432
	struct ieee80211_mgmt *mgmt = (void *)req->data;
1433 1434
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct ieee80211_local *local = sdata->local;
1435
	int tx_last_beacon, len = req->len;
1436
	struct sk_buff *skb;
1437
	struct beacon_data *presp;
1438 1439
	u8 *pos, *end;

1440
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
1441

J
Johannes Berg 已提交
1442
	presp = rcu_dereference_protected(ifibss->presp,
1443
					  lockdep_is_held(&sdata->wdev.mtx));
J
Johannes Berg 已提交
1444

1445
	if (ifibss->state != IEEE80211_IBSS_MLME_JOINED ||
J
Johannes Berg 已提交
1446
	    len < 24 + 2 || !presp)
1447 1448
		return;

1449
	tx_last_beacon = drv_tx_last_beacon(local);
1450

J
Johannes Berg 已提交
1451 1452 1453
	ibss_dbg(sdata,
		 "RX ProbeReq SA=%pM DA=%pM BSSID=%pM (tx_last_beacon=%d)\n",
		 mgmt->sa, mgmt->da, mgmt->bssid, tx_last_beacon);
1454

1455
	if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da))
1456 1457
		return;

1458
	if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) &&
1459
	    !is_broadcast_ether_addr(mgmt->bssid))
1460 1461 1462 1463 1464 1465
		return;

	end = ((u8 *) mgmt) + len;
	pos = mgmt->u.probe_req.variable;
	if (pos[0] != WLAN_EID_SSID ||
	    pos + 2 + pos[1] > end) {
J
Johannes Berg 已提交
1466 1467
		ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n",
			 mgmt->sa);
1468 1469 1470 1471
		return;
	}
	if (pos[1] != 0 &&
	    (pos[1] != ifibss->ssid_len ||
1472
	     memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) {
1473 1474 1475 1476 1477
		/* Ignore ProbeReq for foreign SSID */
		return;
	}

	/* Reply with ProbeResp */
1478
	skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
1479 1480 1481
	if (!skb)
		return;

1482 1483 1484 1485 1486
	skb_reserve(skb, local->tx_headroom);
	memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len);

	memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN);
	ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa);
1487 1488
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
1489 1490
}

1491 1492 1493 1494
static
void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata,
				    struct ieee80211_mgmt *mgmt, size_t len,
				    struct ieee80211_rx_status *rx_status)
1495 1496 1497 1498
{
	size_t baselen;
	struct ieee802_11_elems elems;

1499 1500 1501 1502 1503 1504 1505
	BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) !=
		     offsetof(typeof(mgmt->u.beacon), variable));

	/*
	 * either beacon or probe_resp but the variable field is at the
	 * same offset
	 */
1506 1507 1508 1509 1510
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1511
			       false, &elems);
1512

1513
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
1514 1515
}

1516 1517
void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				   struct sk_buff *skb)
1518 1519 1520 1521
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
1522 1523
	struct ieee802_11_elems elems;
	int ies_len;
1524

1525
	rx_status = IEEE80211_SKB_RXCB(skb);
1526 1527 1528
	mgmt = (struct ieee80211_mgmt *) skb->data;
	fc = le16_to_cpu(mgmt->frame_control);

1529
	sdata_lock(sdata);
J
Johannes Berg 已提交
1530

1531 1532 1533
	if (!sdata->u.ibss.ssid_len)
		goto mgmt_out; /* not ready to merge yet */

1534 1535
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_PROBE_REQ:
1536
		ieee80211_rx_mgmt_probe_req(sdata, skb);
1537 1538 1539
		break;
	case IEEE80211_STYPE_PROBE_RESP:
	case IEEE80211_STYPE_BEACON:
1540 1541
		ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len,
					       rx_status);
1542 1543 1544 1545
		break;
	case IEEE80211_STYPE_AUTH:
		ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len);
		break;
1546 1547 1548
	case IEEE80211_STYPE_DEAUTH:
		ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len);
		break;
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
	case IEEE80211_STYPE_ACTION:
		switch (mgmt->u.action.category) {
		case WLAN_CATEGORY_SPECTRUM_MGMT:
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
				ies_len, true, &elems);

			if (elems.parse_error)
				break;

			ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, skb->len,
							rx_status, &elems);
			break;
		}
1570
	}
J
Johannes Berg 已提交
1571

1572
 mgmt_out:
1573
	sdata_unlock(sdata);
1574 1575
}

1576
void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
1577
{
1578
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
1579
	struct sta_info *sta;
1580

1581
	sdata_lock(sdata);
J
Johannes Berg 已提交
1582 1583 1584 1585 1586 1587 1588 1589

	/*
	 * Work could be scheduled after scan or similar
	 * when we aren't even joined (or trying) with a
	 * network.
	 */
	if (!ifibss->ssid_len)
		goto out;
1590

1591 1592 1593 1594 1595 1596 1597
	spin_lock_bh(&ifibss->incomplete_lock);
	while (!list_empty(&ifibss->incomplete_stations)) {
		sta = list_first_entry(&ifibss->incomplete_stations,
				       struct sta_info, list);
		list_del(&sta->list);
		spin_unlock_bh(&ifibss->incomplete_lock);

1598
		ieee80211_ibss_finish_sta(sta);
1599 1600 1601 1602 1603
		rcu_read_unlock();
		spin_lock_bh(&ifibss->incomplete_lock);
	}
	spin_unlock_bh(&ifibss->incomplete_lock);

1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
	switch (ifibss->state) {
	case IEEE80211_IBSS_MLME_SEARCH:
		ieee80211_sta_find_ibss(sdata);
		break;
	case IEEE80211_IBSS_MLME_JOINED:
		ieee80211_sta_merge_ibss(sdata);
		break;
	default:
		WARN_ON(1);
		break;
	}

J
Johannes Berg 已提交
1616
 out:
1617
	sdata_unlock(sdata);
1618 1619
}

1620 1621 1622 1623
static void ieee80211_ibss_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
1624

1625
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1626 1627
}

1628 1629 1630 1631 1632 1633
void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

	setup_timer(&ifibss->timer, ieee80211_ibss_timer,
		    (unsigned long) sdata);
1634 1635
	INIT_LIST_HEAD(&ifibss->incomplete_stations);
	spin_lock_init(&ifibss->incomplete_lock);
1636 1637
	INIT_WORK(&ifibss->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
1638 1639 1640 1641 1642
}

/* scan finished notification */
void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
{
1643
	struct ieee80211_sub_if_data *sdata;
1644

1645 1646
	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(sdata, &local->interfaces, list) {
1647
		if (!ieee80211_sdata_running(sdata))
1648
			continue;
1649 1650 1651
		if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
			continue;
		sdata->u.ibss.last_scan_completed = jiffies;
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		ieee80211_queue_work(&local->hw, &sdata->work);
1653
	}
1654
	mutex_unlock(&local->iflist_mtx);
1655 1656
}

1657 1658 1659
int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_ibss_params *params)
{
1660
	u32 changed = 0;
1661 1662 1663
	u32 rate_flags;
	struct ieee80211_supported_band *sband;
	int i;
1664 1665 1666 1667 1668 1669 1670

	if (params->bssid) {
		memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN);
		sdata->u.ibss.fixed_bssid = true;
	} else
		sdata->u.ibss.fixed_bssid = false;

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	sdata->u.ibss.privacy = params->privacy;
1672
	sdata->u.ibss.control_port = params->control_port;
1673
	sdata->u.ibss.basic_rates = params->basic_rates;
1674 1675 1676 1677 1678 1679 1680 1681

	/* fix basic_rates if channel does not support these rates */
	rate_flags = ieee80211_chandef_rate_flags(&params->chandef);
	sband = sdata->local->hw.wiphy->bands[params->chandef.chan->band];
	for (i = 0; i < sband->n_bitrates; i++) {
		if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
			sdata->u.ibss.basic_rates &= ~BIT(i);
	}
1682 1683
	memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate,
	       sizeof(params->mcast_rate));
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1685 1686
	sdata->vif.bss_conf.beacon_int = params->beacon_interval;

1687
	sdata->u.ibss.chandef = params->chandef;
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699
	sdata->u.ibss.fixed_channel = params->channel_fixed;

	if (params->ie) {
		sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len,
					   GFP_KERNEL);
		if (sdata->u.ibss.ie)
			sdata->u.ibss.ie_len = params->ie_len;
	}

	sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
	sdata->u.ibss.ibss_join_req = jiffies;

1700
	memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
1701 1702
	sdata->u.ibss.ssid_len = params->ssid_len;

1703 1704 1705 1706 1707
	memcpy(&sdata->u.ibss.ht_capa, &params->ht_capa,
	       sizeof(sdata->u.ibss.ht_capa));
	memcpy(&sdata->u.ibss.ht_capa_mask, &params->ht_capa_mask,
	       sizeof(sdata->u.ibss.ht_capa_mask));

1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724
	/*
	 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is
	 * reserved, but an HT STA shall protect HT transmissions as though
	 * the HT Protection field were set to non-HT mixed mode.
	 *
	 * In an IBSS, the RIFS Mode field of the HT Operation element is
	 * also reserved, but an HT STA shall operate as though this field
	 * were set to 1.
	 */

	sdata->vif.bss_conf.ht_operation_mode |=
		  IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED
		| IEEE80211_HT_PARAM_RIFS_MODE;

	changed |= BSS_CHANGED_HT;
	ieee80211_bss_info_change_notify(sdata, changed);

1725 1726 1727
	sdata->smps_mode = IEEE80211_SMPS_OFF;
	sdata->needed_rx_chains = sdata->local->rx_chains;

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	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1729 1730 1731 1732 1733 1734

	return 0;
}

int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
{
1735 1736
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

1737
	ieee80211_ibss_disconnect(sdata);
1738
	ifibss->ssid_len = 0;
1739
	memset(ifibss->bssid, 0, ETH_ALEN);
1740 1741 1742

	/* remove beacon */
	kfree(sdata->u.ibss.ie);
1743 1744 1745 1746 1747

	/* on the next join, re-program HT parameters */
	memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa));
	memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask));

1748 1749
	synchronize_rcu();

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	skb_queue_purge(&sdata->skb_queue);
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1751

1752
	del_timer_sync(&sdata->u.ibss.timer);
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1754 1755
	return 0;
}