summaryrefslogtreecommitdiff
path: root/package/mac80211/files/lib/wifi/mac80211.sh
blob: a052a1cbfb9584ed86fd3fc150bef22686156ea7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
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
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
#!/bin/sh
append DRIVERS "mac80211"

mac80211_hostapd_setup_base() {
	local phy="$1"
	local ifname="$2"

	cfgfile="/var/run/hostapd-$phy.conf"

	config_get device "$vif" device
	config_get country "$device" country
	config_get hwmode "$device" hwmode
	config_get channel "$device" channel
	config_get beacon_int "$device" beacon_int
	config_get basic_rate_list "$device" basic_rate
	config_get_bool noscan "$device" noscan

	hostapd_set_log_options base_cfg "$device"

	[ -n "$channel" -a -z "$hwmode" ] && wifi_fixup_hwmode "$device"

	[ "$channel" = auto ] && {
		channel=$(iw phy "$phy" info | \
			sed -ne '/MHz/ { /disabled\|passive\|radar/d; s/.*\[//; s/\].*//; p; q }')
		config_set "$device" channel "$channel"
	}

	[ -n "$hwmode" ] && {
		config_get hwmode_11n "$device" hwmode_11n
		[ -n "$hwmode_11n" ] && {
			hwmode="$hwmode_11n"
			append base_cfg "ieee80211n=1" "$N"
			config_get htmode "$device" htmode
			config_get ht_capab_list "$device" ht_capab
			case "$htmode" in
				HT20|HT40+|HT40-) ht_capab="[$htmode]";;
				*)ht_capab=;;
			esac
			for cap in $ht_capab_list; do
				ht_capab="$ht_capab[$cap]"
			done
			[ -n "$ht_capab" ] && append base_cfg "ht_capab=$ht_capab" "$N"
		}
	}

	local country_ie=0
	[ -n "$country" ] && country_ie=1
	config_get_bool country_ie "$device" country_ie "$country_ie"
	[ "$country_ie" -gt 0 ] && append base_cfg "ieee80211d=1" "$N"

	local br brval brstr
	[ -n "$basic_rate_list" ] && {
		for br in $basic_rate_list; do
			brval="$(($br / 100))"
			[ -n "$brstr" ] && brstr="$brstr "
			brstr="$brstr$brval"
		done
	}

	cat >> "$cfgfile" <<EOF
ctrl_interface=/var/run/hostapd-$phy
driver=nl80211
wmm_ac_bk_cwmin=4
wmm_ac_bk_cwmax=10
wmm_ac_bk_aifs=7
wmm_ac_bk_txop_limit=0
wmm_ac_bk_acm=0
wmm_ac_be_aifs=3
wmm_ac_be_cwmin=4
wmm_ac_be_cwmax=10
wmm_ac_be_txop_limit=0
wmm_ac_be_acm=0
wmm_ac_vi_aifs=2
wmm_ac_vi_cwmin=3
wmm_ac_vi_cwmax=4
wmm_ac_vi_txop_limit=94
wmm_ac_vi_acm=0
wmm_ac_vo_aifs=2
wmm_ac_vo_cwmin=2
wmm_ac_vo_cwmax=3
wmm_ac_vo_txop_limit=47
wmm_ac_vo_acm=0
tx_queue_data3_aifs=7
tx_queue_data3_cwmin=15
tx_queue_data3_cwmax=1023
tx_queue_data3_burst=0
tx_queue_data2_aifs=3
tx_queue_data2_cwmin=15
tx_queue_data2_cwmax=63
tx_queue_data2_burst=0
tx_queue_data1_aifs=1
tx_queue_data1_cwmin=7
tx_queue_data1_cwmax=15
tx_queue_data1_burst=3.0
tx_queue_data0_aifs=1
tx_queue_data0_cwmin=3
tx_queue_data0_cwmax=7
tx_queue_data0_burst=1.5
${hwmode:+hw_mode=$hwmode}
${channel:+channel=$channel}
${beacon_int:+beacon_int=$beacon_int}
${country:+country_code=$country}
${noscan:+noscan=$noscan}
${brstr:+basic_rates=$brstr}
$base_cfg

EOF
}

mac80211_hostapd_setup_bss() {
	local phy="$1"
	local vif="$2"

	hostapd_cfg=
	cfgfile="/var/run/hostapd-$phy.conf"
	config_get ifname "$vif" ifname

	if [ -f "$cfgfile" ]; then
		append hostapd_cfg "bss=$ifname" "$N"
	else
		mac80211_hostapd_setup_base "$phy" "$ifname"
		append hostapd_cfg "interface=$ifname" "$N"
	fi

	local net_cfg bridge
	net_cfg="$(find_net_config "$vif")"
	[ -z "$net_cfg" ] || bridge="$(bridge_interface "$net_cfg")"
	config_set "$vif" bridge "$bridge"

	hostapd_set_bss_options hostapd_cfg "$vif"

	config_get_bool wds "$vif" wds 0
	[ "$wds" -gt 0 ] && append hostapd_cfg "wds_sta=1" "$N"

	local macaddr hidden maxassoc wmm
	config_get macaddr "$vif" macaddr
	config_get maxassoc "$vif" maxassoc
	config_get dtim_period "$vif" dtim_period
	config_get max_listen_int "$vif" max_listen_int
	config_get_bool hidden "$vif" hidden 0
	config_get_bool wmm "$vif" wmm 1
	cat >> /var/run/hostapd-$phy.conf <<EOF
$hostapd_cfg
wmm_enabled=$wmm
bssid=$macaddr
ignore_broadcast_ssid=$hidden
${dtim_period:+dtim_period=$dtim_period}
${max_listen_int:+max_listen_interval=$max_listen_int}
${maxassoc:+max_num_sta=$maxassoc}
EOF
}

mac80211_start_vif() {
	local vif="$1"
	local ifname="$2"

	local net_cfg
	net_cfg="$(find_net_config "$vif")"
	[ -z "$net_cfg" ] || start_net "$ifname" "$net_cfg"

	set_wifi_up "$vif" "$ifname"
}

lookup_phy() {
	[ -n "$phy" ] && {
		[ -d /sys/class/ieee80211/$phy ] && return
	}

	local devpath
	config_get devpath "$device" path
	[ -n "$devpath" -a -d "/sys/devices/$devpath/ieee80211" ] && {
		phy="$(ls /sys/devices/$devpath/ieee80211 | grep -m 1 phy)"
		[ -n "$phy" ] && return
	}

	local macaddr="$(config_get "$device" macaddr | tr 'A-Z' 'a-z')"
	[ -n "$macaddr" ] && {
		for _phy in $(ls /sys/class/ieee80211 2>/dev/null); do
			[ "$macaddr" = "$(cat /sys/class/ieee80211/${_phy}/macaddress)" ] || continue
			phy="$_phy"
			return
		done
	}
	phy=
	return
}

find_mac80211_phy() {
	local device="$1"

	config_get phy "$device" phy
	lookup_phy
	[ -n "$phy" -a -d "/sys/class/ieee80211/$phy" ] || {
		echo "PHY for wifi device $1 not found"
		return 1
	}
	config_set "$device" phy "$phy"

	config_get macaddr "$device" macaddr
	[ -z "$macaddr" ] && {
		config_set "$device" macaddr "$(cat /sys/class/ieee80211/${phy}/macaddress)"
	}

	return 0
}

scan_mac80211() {
	local device="$1"
	local adhoc sta ap monitor mesh disabled

	config_get vifs "$device" vifs
	for vif in $vifs; do
		config_get_bool disabled "$vif" disabled 0
		[ $disabled = 0 ] || continue

		config_get mode "$vif" mode
		case "$mode" in
			adhoc|sta|ap|monitor|mesh)
				append $mode "$vif"
			;;
			*) echo "$device($vif): Invalid mode, ignored."; continue;;
		esac
	done

	config_set "$device" vifs "${ap:+$ap }${adhoc:+$adhoc }${sta:+$sta }${monitor:+$monitor }${mesh:+$mesh}"
}

list_phy_interfaces() {
	local phy="$1"
	if [ -d "/sys/class/ieee80211/${phy}/device/net" ]; then
		ls "/sys/class/ieee80211/${phy}/device/net" 2>/dev/null;
	else
		ls "/sys/class/ieee80211/${phy}/device" 2>/dev/null | grep net: | sed -e 's,net:,,g'
	fi
}

disable_mac80211() (
	local device="$1"

	find_mac80211_phy "$device" || return 0
	config_get phy "$device" phy

	set_wifi_down "$device"
	# kill all running hostapd and wpa_supplicant processes that
	# are running on atheros/mac80211 vifs
	for pid in `pidof hostapd`; do
		grep -E "$phy" /proc/$pid/cmdline >/dev/null && \
			kill $pid
	done

	include /lib/network
	for wdev in $(list_phy_interfaces "$phy"); do
		[ -f "/var/run/$wdev.pid" ] && kill $(cat /var/run/$wdev.pid) >&/dev/null 2>&1
		for pid in `pidof wpa_supplicant`; do
			grep "$wdev" /proc/$pid/cmdline >/dev/null && \
				kill $pid
		done
		ifconfig "$wdev" down 2>/dev/null
		unbridge "$dev"
		iw dev "$wdev" del
	done

	return 0
)

get_freq() {
	local phy="$1"
	local chan="$2"
	iw "$phy" info | grep -E -m1 "(\* ${chan:-....} MHz${chan:+|\\[$chan\\]})" | grep MHz | awk '{print $2}'
}

mac80211_generate_mac() {
	local id="$1"
	local ref="$2"
	local mask="$3"

	[ "$mask" = "00:00:00:00:00:00" ] && mask="ff:ff:ff:ff:ff:ff";
	local oIFS="$IFS"; IFS=":"; set -- $mask; IFS="$oIFS"

	local mask1=$1
	local mask6=$6

	local oIFS="$IFS"; IFS=":"; set -- $ref; IFS="$oIFS"
	[ "$((0x$mask1))" -gt 0 ] && {
		b1="0x$1"
		[ "$id" -gt 0 ] && \
			b1=$((($b1 | 0x2) ^ (($id - 1) << 2)))
		printf "%02x:%s:%s:%s:%s:%s" $b1 $2 $3 $4 $5 $6
		return
	}

	[ "$((0x$mask6))" -lt 255 ] && {
		printf "%s:%s:%s:%s:%s:%02x" $1 $2 $3 $4 $5 $(( 0x$6 ^ $id ))
		return
	}

	off2=$(( (0x$6 + $id) / 0x100 ))
	printf "%s:%s:%s:%s:%02x:%02x" \
		$1 $2 $3 $4 \
		$(( (0x$5 + $off2) % 0x100 )) \
		$(( (0x$6 + $id) % 0x100 ))
}

enable_mac80211() {
	local device="$1"
	config_get channel "$device" channel
	config_get vifs "$device" vifs
	config_get txpower "$device" txpower
	config_get country "$device" country
	config_get distance "$device" distance
	config_get txantenna "$device" txantenna all
	config_get rxantenna "$device" rxantenna all
	config_get antenna_gain "$device" antenna_gain 0
	config_get frag "$device" frag
	config_get rts "$device" rts
	find_mac80211_phy "$device" || return 0
	config_get phy "$device" phy
	local i=0
	local macidx=0
	local apidx=0
	fixed=""
	local hostapd_ctrl=""

	[ -n "$country" ] && {
		iw reg get | grep -q "^country $country:" || {
			iw reg set "$country"
			sleep 1
		}
	}

	config_get chanbw "$device" chanbw
	[ -n "$chanbw" -a -d /sys/kernel/debug/ieee80211/$phy/ath9k ] && echo "$chanbw" > /sys/kernel/debug/ieee80211/$phy/ath9k/chanbw
	[ -n "$chanbw" -a -d /sys/kernel/debug/ieee80211/$phy/ath5k ] && echo "$chanbw" > /sys/kernel/debug/ieee80211/$phy/ath5k/bwmode

	[ "$channel" = "auto" -o "$channel" = "0" ] || {
		fixed=1
	}

	iw phy "$phy" set antenna $txantenna $rxantenna >/dev/null 2>&1
	iw phy "$phy" set antenna_gain $antenna_gain

	[ -n "$distance" ] && iw phy "$phy" set distance "$distance"
	[ -n "$frag" ] && iw phy "$phy" set frag "${frag%%.*}"
	[ -n "$rts" ] && iw phy "$phy" set rts "${rts%%.*}"

	export channel fixed
	# convert channel to frequency
	local freq="$(get_freq "$phy" "${fixed:+$channel}")"

	wifi_fixup_hwmode "$device" "g"
	for vif in $vifs; do
		config_get ifname "$vif" ifname
		[ -n "$ifname" ] || {
			[ $i -gt 0 ] && ifname="wlan${phy#phy}-$i" || ifname="wlan${phy#phy}"
		}
		config_set "$vif" ifname "$ifname"

		config_get mode "$vif" mode
		config_get ssid "$vif" ssid

		# It is far easier to delete and create the desired interface
		case "$mode" in
			adhoc)
				iw phy "$phy" interface add "$ifname" type adhoc
			;;
			ap)
				# Hostapd will handle recreating the interface and
				# it's accompanying monitor
				apidx="$(($apidx + 1))"
				[ "$apidx" -gt 1 ] || iw phy "$phy" interface add "$ifname" type managed
			;;
			mesh)
				config_get mesh_id "$vif" mesh_id
				iw phy "$phy" interface add "$ifname" type mp mesh_id "$mesh_id"
			;;
			monitor)
				iw phy "$phy" interface add "$ifname" type monitor
			;;
			sta)
				local wdsflag
				config_get_bool wds "$vif" wds 0
				[ "$wds" -gt 0 ] && wdsflag="4addr on"
				iw phy "$phy" interface add "$ifname" type managed $wdsflag
				config_get_bool powersave "$vif" powersave 0
				[ "$powersave" -gt 0 ] && powersave="on" || powersave="off"
				iw "$ifname" set power_save "$powersave"
			;;
		esac

		# All interfaces must have unique mac addresses
		# which can either be explicitly set in the device
		# section, or automatically generated
		config_get macaddr "$device" macaddr
		config_get vif_mac "$vif" macaddr
		[ -n "$vif_mac" ] || {
			vif_mac="$(mac80211_generate_mac $macidx $macaddr $(cat /sys/class/ieee80211/${phy}/address_mask))"
			macidx="$(($macidx + 1))"
		}
		[ "$mode" = "ap" ] || ifconfig "$ifname" hw ether "$vif_mac"
		config_set "$vif" macaddr "$vif_mac"

		# !! ap !!
		#
		# ALL ap functionality will be passed to hostapd
		#
		# !! station !!
		#
		# ALL station functionality will be passed to wpa_supplicant
		#
		if [ ! "$mode" = "ap" ]; then
			# We attempt to set the channel for all interfaces, although
			# mac80211 may not support it or the driver might not yet
			# for ap mode this is handled by hostapd
			config_get htmode "$device" htmode
			case "$htmode" in
				HT20|HT40+|HT40-) ;;
				*) htmode= ;;
			esac
			[ -n "$fixed" -a -n "$channel" ] && iw dev "$ifname" set channel "$channel" $htmode
		fi

		i=$(($i + 1))
	done

	local start_hostapd=
	rm -f /var/run/hostapd-$phy.conf
	for vif in $vifs; do
		config_get mode "$vif" mode
		[ "$mode" = "ap" ] || continue
		mac80211_hostapd_setup_bss "$phy" "$vif"
		start_hostapd=1
	done

	[ -n "$start_hostapd" ] && {
		hostapd -P /var/run/wifi-$phy.pid -B /var/run/hostapd-$phy.conf || {
			echo "Failed to start hostapd for $phy"
			return
		}
		sleep 2

		for vif in $vifs; do
			config_get mode "$vif" mode
			config_get ifname "$vif" ifname
			[ "$mode" = "ap" ] || continue
			hostapd_ctrl="${hostapd_ctrl:-/var/run/hostapd-$phy/$ifname}"
			mac80211_start_vif "$vif" "$ifname"
		done
	}

	for vif in $vifs; do
		config_get mode "$vif" mode
		config_get ifname "$vif" ifname
		[ "$mode" = "ap" ] || ifconfig "$ifname" up

		config_get vif_txpower "$vif" txpower
		# use vif_txpower (from wifi-iface) to override txpower (from
		# wifi-device) if the latter doesn't exist
		txpower="${txpower:-$vif_txpower}"
		[ -z "$txpower" ] || iw dev "$ifname" set txpower fixed "${txpower%%.*}00"

		case "$mode" in
			adhoc)
				config_get bssid "$vif" bssid
				config_get ssid "$vif" ssid
				config_get beacon_int "$device" beacon_int
				config_get basic_rate_list "$device" basic_rate
				config_get encryption "$vif" encryption
				config_get key "$vif" key 1
				config_get mcast_rate "$vif" mcast_rate
				config_get htmode "$device" htmode
				case "$htmode" in
					HT20|HT40+|HT40-) ;;
					*) htmode= ;;
				esac


				local keyspec=""
				[ "$encryption" == "psk" -o "$encryption" == "psk2" ] && {
					if eval "type wpa_supplicant_setup_vif" 2>/dev/null >/dev/null; then
						wpa_supplicant_setup_vif "$vif" nl80211 "${hostapd_ctrl:+-H $hostapd_ctrl}" $freq $htmode || {
							echo "enable_mac80211($device): Failed to set up wpa_supplicant for interface $ifname" >&2
							# make sure this wifi interface won't accidentally stay open without encryption
							ifconfig "$ifname" down
						}
						mac80211_start_vif "$vif" "$ifname"
						continue
					fi
				}

				[ "$encryption" == "wep" ] && {
					case "$key" in
						[1234])
							local idx
							for idx in 1 2 3 4; do
								local ikey
								config_get ikey "$vif" "key$idx"

								[ -n "$ikey" ] && {
									ikey="$(($idx - 1)):$(prepare_key_wep "$ikey")"
									[ $idx -eq $key ] && ikey="d:$ikey"
									append keyspec "$ikey"
								}
							done
						;;
						*) append keyspec "d:0:$(prepare_key_wep "$key")" ;;
					esac
				}

				local br brval brsub brstr
				[ -n "$basic_rate_list" ] && {
					for br in $basic_rate_list; do
						brval="$(($br / 1000))"
						brsub="$((($br / 100) % 10))"
						[ "$brsub" -gt 0 ] && brval="$brval.$brsub"
						[ -n "$brstr" ] && brstr="$brstr,"
						brstr="$brstr$brval"
					done
				}

				local mcval=""
				[ -n "$mcast_rate" ] && {
					mcval="$(($mcast_rate / 1000))"
					mcsub="$(( ($mcast_rate / 100) % 10 ))"
					[ "$mcsub" -gt 0 ] && mcval="$mcval.$mcsub"
				}

				iw dev "$ifname" ibss join "$ssid" $freq $htmode \
					${fixed:+fixed-freq} $bssid \
					${beacon_int:+beacon-interval $beacon_int} \
					${brstr:+basic-rates $brstr} \
					${mcval:+mcast-rate $mcval} \
					${keyspec:+keys $keyspec}
			;;
			mesh)
				mp_list="mesh_retry_timeout mesh_confirm_timeout mesh_holding_timeout mesh_max_peer_links
					mesh_max_retries mesh_ttl mesh_element_ttl mesh_auto_open_plinks mesh_hwmp_max_preq_retries
					mesh_path_refresh_time mesh_min_discovery_timeout mesh_hwmp_active_path_timeout
					mesh_hwmp_preq_min_interval mesh_hwmp_net_diameter_traversal_time mesh_hwmp_rootmode
					mesh_hwmp_rann_interval mesh_gate_announcements mesh_fwding mesh_sync_offset_max_neighor
					mesh_rssi_threshold mesh_hwmp_active_path_to_root_timeout mesh_hwmp_root_interval
					mesh_hwmp_confirmation_interval mesh_power_mode mesh_awake_window"
				for mp in $mp_list
				do
					config_get mp_val "$vif" "$mp" ""
					[ -n "$mp_val" ] && iw dev "$ifname" set mesh_param "$mp" "$mp_val"
				done
			;;
			sta)
				if eval "type wpa_supplicant_setup_vif" 2>/dev/null >/dev/null; then
					wpa_supplicant_setup_vif "$vif" nl80211 "${hostapd_ctrl:+-H $hostapd_ctrl}" || {
						echo "enable_mac80211($device): Failed to set up wpa_supplicant for interface $ifname" >&2
						# make sure this wifi interface won't accidentally stay open without encryption
						ifconfig "$ifname" down
						continue
					}
				fi
			;;
		esac
		[ "$mode" = "ap" ] || mac80211_start_vif "$vif" "$ifname"
	done

}


check_mac80211_device() {
	config_get phy "$1" phy
	[ -z "$phy" ] && {
		find_mac80211_phy "$1" >/dev/null || return 0
		config_get phy "$1" phy
	}
	[ "$phy" = "$dev" ] && found=1
}

detect_mac80211() {
	devidx=0
	config_load wireless
	while :; do
		config_get type "radio$devidx" type
		[ -n "$type" ] || break
		devidx=$(($devidx + 1))
	done
	for dev in $(ls /sys/class/ieee80211); do
		found=0
		config_foreach check_mac80211_device wifi-device
		[ "$found" -gt 0 ] && continue

		mode_11n=""
		mode_band="g"
		channel="11"
		ht_cap=0
		for cap in $(iw phy "$dev" info | grep 'Capabilities:' | cut -d: -f2); do
			ht_cap="$(($ht_cap | $cap))"
		done
		ht_capab="";
		[ "$ht_cap" -gt 0 ] && {
			mode_11n="n"
			append ht_capab "	option htmode	HT20" "$N"

			list="	list ht_capab"
			[ "$(($ht_cap & 1))" -eq 1 ] && append ht_capab "$list	LDPC" "$N"
			[ "$(($ht_cap & 16))" -eq 16 ] && append ht_capab "$list	GF" "$N"
			[ "$(($ht_cap & 32))" -eq 32 ] && append ht_capab "$list	SHORT-GI-20" "$N"
			[ "$(($ht_cap & 64))" -eq 64 ] && append ht_capab "$list	SHORT-GI-40" "$N"
			[ "$(($ht_cap & 128))" -eq 128 ] && append ht_capab "$list	TX-STBC" "$N"
			[ "$(($ht_cap & 768))" -eq 256 ] && append ht_capab "$list	RX-STBC1" "$N"
			[ "$(($ht_cap & 768))" -eq 512 ] && append ht_capab "$list	RX-STBC12" "$N"
			[ "$(($ht_cap & 768))" -eq 768 ] && append ht_capab "$list	RX-STBC123" "$N"
			[ "$(($ht_cap & 4096))" -eq 4096 ] && append ht_capab "$list	DSSS_CCK-40" "$N"
		}
		iw phy "$dev" info | grep -q '2412 MHz' || { mode_band="a"; channel="36"; }

		if [ -x /usr/bin/readlink ]; then
			path="$(readlink -f /sys/class/ieee80211/${dev}/device)"
			path="${path##/sys/devices/}"
			dev_id="	option path	'$path'"
		else
			dev_id="	option macaddr	$(cat /sys/class/ieee80211/${dev}/macaddress)"
		fi

		cat <<EOF
config wifi-device  radio$devidx
	option type     mac80211
	option channel  ${channel}
	option hwmode	11${mode_11n}${mode_band}
$dev_id
$ht_capab
	# REMOVE THIS LINE TO ENABLE WIFI:
	option disabled 1

config wifi-iface
	option device   radio$devidx
	option network  lan
	option mode     ap
	option ssid     OpenWrt
	option encryption none

EOF
	devidx=$(($devidx + 1))
	done
}