Release 4.11 net/mac80211/ibss.c

/*
 * 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>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright(c) 2016 Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>

#include "ieee80211_i.h"
#include "driver-ops.h"
#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)

#define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ)


#define IEEE80211_IBSS_MAX_STA_ENTRIES 128


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,
			   bool *have_higher_than_11mbit,
			   struct cfg80211_csa_settings *csa_settings)
{
	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
	struct ieee80211_local *local = sdata->local;
	int rates_n = 0, i, ri;
	struct ieee80211_mgmt *mgmt;
	u8 *pos;
	struct ieee80211_supported_band *sband;
	u32 rate_flags, rates = 0, rates_added = 0;
	struct beacon_data *presp;
	int frame_len;
	int shift;

	/* Build IBSS probe response */
	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 */ +
		    5 /* Channel Switch Announcement */ +
		    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)
		return NULL;

	presp->head = (void *)(presp + 1);

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

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

	*pos++ = WLAN_EID_SSID;
	*pos++ = ifibss->ssid_len;
	memcpy(pos, ifibss->ssid, ifibss->ssid_len);
	pos += ifibss->ssid_len;

	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;

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

		rates |= BIT(i);
		rates_n++;
	}

	*pos++ = WLAN_EID_SUPP_RATES;
	*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));
		u8 basic = 0;
		if (!(rates & BIT(ri)))
			continue;

		if (basic_rates & BIT(ri))
			basic = 0x80;
		*pos++ = basic | (u8) rate;
		if (++rates_added == 8) {
			ri++; /* continue at next rate for EXT_SUPP_RATES */
			break;
		}
	}

	if (sband->band == NL80211_BAND_2GHZ) {
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
		*pos++ = ieee80211_frequency_to_channel(
				chandef->chan->center_freq);
	}

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

	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);
		presp->csa_counter_offsets[0] = (pos - presp->head);
		*pos++ = csa_settings->count;
		presp->csa_current_counter = csa_settings->count;
	}

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

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

	if (ifibss->ie_len) {
		memcpy(pos, ifibss->ie, ifibss->ie_len);
		pos += ifibss->ie_len;
	}

	/* add HT capability and information IEs */
	if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
	    chandef->width != NL80211_CHAN_WIDTH_5 &&
	    chandef->width != NL80211_CHAN_WIDTH_10 &&
	    sband->ht_cap.ht_supported) {
		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);
		/*
                 * 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
                 */
		pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
						 chandef, 0, false);

		/* add VHT capability and information IEs */
		if (chandef->width != NL80211_CHAN_WIDTH_20 &&
		    chandef->width != NL80211_CHAN_WIDTH_40 &&
		    sband->vht_cap.vht_supported) {
			pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
							 sband->vht_cap.cap);
			pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap,
							  chandef);
		}
	}

	if (local->hw.queues >= IEEE80211_NUM_ACS)
		pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */

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

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

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Simon Wunderlich
592
56.76%
6
20.00%
Johannes Berg
359
34.42%
14
46.67%
Janusz Dziedzic
55
5.27%
1
3.33%
Chun-Yeow Yeoh
8
0.77%
1
3.33%
Alexander Simon
7
0.67%
1
3.33%
Sujith Manoharan
7
0.67%
2
6.67%
Arik Nemtsov
7
0.67%
2
6.67%
Eliad Peller
3
0.29%
1
3.33%
Andrei Otcheretianski
3
0.29%
1
3.33%
Michal Kazior
2
0.19%
1
3.33%
Total
1043
100.00%
30
100.00%



static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
				      const u8 *bssid, const int beacon_int,
				      struct cfg80211_chan_def *req_chandef,
				      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_mgmt *mgmt;
	struct cfg80211_bss *bss;
	u32 bss_change;
	struct cfg80211_chan_def chandef;
	struct ieee80211_channel *chan;
	struct beacon_data *presp;
	struct cfg80211_inform_bss bss_meta = {};
	bool have_higher_than_11mbit;
	bool radar_required;
	int err;

	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);
		drv_leave_ibss(local, sdata);
	}

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

	/* make a copy of the chandef, it could be modified below. */
	chandef = *req_chandef;
	chan = chandef.chan;
	if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
				     NL80211_IFTYPE_ADHOC)) {
		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;
		/* check again for downgraded chandef */
		if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef,
					     NL80211_IFTYPE_ADHOC)) {
			sdata_info(sdata,
				   "Failed to join IBSS, beacons forbidden\n");
			return;
		}
	}

	err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
					    &chandef, NL80211_IFTYPE_ADHOC);
	if (err < 0) {
		sdata_info(sdata,
			   "Failed to join IBSS, invalid chandef\n");
		return;
	}
	if (err > 0 && !ifibss->userspace_handles_dfs) {
		sdata_info(sdata,
			   "Failed to join IBSS, DFS channel without control program\n");
		return;
	}

	radar_required = err;

	mutex_lock(&local->mtx);
	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");
		mutex_unlock(&local->mtx);
		return;
	}
	sdata->radar_required = radar_required;
	mutex_unlock(&local->mtx);

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

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

	rcu_assign_pointer(ifibss->presp, presp);
	mgmt = (void *)presp->head;

	sdata->vif.bss_conf.enable_beacon = true;
	sdata->vif.bss_conf.beacon_int = beacon_int;
	sdata->vif.bss_conf.basic_rates = basic_rates;
	sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
	memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
	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;
	bss_change |= BSS_CHANGED_BASIC_RATES;
	bss_change |= BSS_CHANGED_HT;
	bss_change |= BSS_CHANGED_IBSS;
	bss_change |= BSS_CHANGED_SSID;

	/*
         * 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 == NL80211_BAND_5GHZ;
	bss_change |= BSS_CHANGED_ERP_SLOT;

	/* cf. IEEE 802.11 9.2.12 */
	if (chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

	ieee80211_set_wmm_default(sdata, true, false);

	sdata->vif.bss_conf.ibss_joined = true;
	sdata->vif.bss_conf.ibss_creator = creator;

	err = drv_join_ibss(local, sdata);
	if (err) {
		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;
		RCU_INIT_POINTER(ifibss->presp, NULL);
		kfree_rcu(presp, rcu_head);
		mutex_lock(&local->mtx);
		ieee80211_vif_release_channel(sdata);
		mutex_unlock(&local->mtx);
		sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n",
			   err);
		return;
	}

	ieee80211_bss_info_change_notify(sdata, bss_change);

	ifibss->state = IEEE80211_IBSS_MLME_JOINED;
	mod_timer(&ifibss->timer,
		  round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));

	bss_meta.chan = chan;
	bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef);
	bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt,
					     presp->head_len, GFP_KERNEL);

	cfg80211_put_bss(local->hw.wiphy, bss);
	netif_carrier_on(sdata->dev);
	cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL);
}

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Simon Wunderlich
453
50.56%
8
21.62%
Johannes Berg
309
34.49%
14
37.84%
Marek Puzyniak
35
3.91%
1
2.70%
Luciano Coelho
20
2.23%
2
5.41%
Alexander Simon
18
2.01%
1
2.70%
John W. Linville
15
1.67%
1
2.70%
Teemu Paasikivi
14
1.56%
2
5.41%
Sujith Manoharan
10
1.12%
1
2.70%
Eliad Peller
7
0.78%
1
2.70%
Michal Kazior
6
0.67%
1
2.70%
Ilan Peer
4
0.45%
1
2.70%
Antonio Quartulli
2
0.22%
1
2.70%
Eric Dumazet
1
0.11%
1
2.70%
Ashok Nagarajan
1
0.11%
1
2.70%
Monam Agarwal
1
0.11%
1
2.70%
Total
896
100.00%
37
100.00%



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

	sdata_assert_lock(sdata);

	if (beacon_int < 10)
		beacon_int = 10;

	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;
	case NL80211_CHAN_WIDTH_80:
	case NL80211_CHAN_WIDTH_80P80:
	case NL80211_CHAN_WIDTH_160:
		chandef = sdata->u.ibss.chandef;
		chandef.chan = cbss->channel;
		break;
	default:
		/* fall back to 20 MHz for unsupported modes */
		cfg80211_chandef_create(&chandef, cbss->channel,
					NL80211_CHAN_WIDTH_20_NOHT);
		break;
	}

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

	basic_rates = 0;

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

		for (j = 0; j < sband->n_bitrates; j++) {
			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) {
				if (is_basic)
					basic_rates |= BIT(j);
				break;
			}
		}
	}

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

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

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8
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Simon Wunderlich
174
39.91%
2
14.29%
Janusz Dziedzic
25
5.73%
1
7.14%
Sujith Manoharan
4
0.92%
2
14.29%
Jouni Malinen
3
0.69%
1
7.14%
Total
436
100.00%
14
100.00%



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 = WLAN_CAPABILITY_IBSS;
	u64 tsf;
	int ret = 0;

	sdata_assert_lock(sdata);

	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, IEEE80211_BSS_TYPE_IBSS,
				IEEE80211_PRIVACY(ifibss->privacy));

	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);

	return BSS_CHANGED_BEACON;
 out:
	return ret;
}

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Simon Wunderlich
164
62.12%
2
25.00%
Johannes Berg
83
31.44%
2
25.00%
Dedy Lansky
8
3.03%
1
12.50%
Ashok Nagarajan
5
1.89%
1
12.50%
Luciano Coelho
2
0.76%
1
12.50%
Koen Vandeputte
2
0.76%
1
12.50%
Total
264
100.00%
8
100.00%



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, changed = 0;

	sdata_assert_lock(sdata);

	/* update cfg80211 bss information with the new channel */
	if (!is_zero_ether_addr(ifibss->bssid)) {
		cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
					ifibss->chandef.chan,
					ifibss->bssid, ifibss->ssid,
					ifibss->ssid_len,
					IEEE80211_BSS_TYPE_IBSS,
					IEEE80211_PRIVACY(ifibss->privacy));
		/* XXX: should not really modify cfg80211 data */
		if (cbss) {
			cbss->channel = sdata->csa_chandef.chan;
			cfg80211_put_bss(sdata->local->hw.wiphy, cbss);
		}
	}

	ifibss->chandef = sdata->csa_chandef;

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

	changed |= err;

	return changed;
}

Contributors
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CommitProp
Simon Wunderlich
105
67.31%
3
30.00%
Antonio Quartulli
34
21.79%
3
30.00%
Michal Kazior
7
4.49%
1
10.00%
Dedy Lansky
7
4.49%
1
10.00%
Luciano Coelho
2
1.28%
1
10.00%
Johannes Berg
1
0.64%
1
10.00%
Total
156
100.00%
10
100.00%



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);
}

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Simon Wunderlich
30
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2
100.00%
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30
100.00%
2
100.00%


static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
	__acquires
(RCU)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	u8 addr[ETH_ALEN];

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

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

	sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
	sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
	/* 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);

	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;
}

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113
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2
100.00%


static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
		       const u8 *addr, u32 supp_rates)
	__acquires
(RCU)