package/mac80211/files/lib/wifi/mac80211.sh

   1 #!/bin/sh
   2 append DRIVERS "mac80211"
   3
   4 mac80211_hostapd_setup_base() {
   5         local phy="$1"
   6         local ifname="$2"
   7
   8         cfgfile="/var/run/hostapd-$phy.conf"
   9         macfile="/var/run/hostapd-$phy.maclist"
  10         [ -e "$macfile" ] && rm -f "$macfile"
  11
  12         config_get device "$vif" device
  13         config_get country "$device" country
  14         config_get hwmode "$device" hwmode
  15         config_get channel "$device" channel
  16         config_get beacon_int "$device" beacon_int
  17         config_get basic_rate_list "$device" basic_rate
  18         config_get_bool noscan "$device" noscan
  19         config_get_bool short_preamble "$device" short_preamble "0"
  20
  21         hostapd_set_log_options base_cfg "$device"
  22
  23         [ -n "$channel" -a -z "$hwmode" ] && wifi_fixup_hwmode "$device"
  24
  25         [ "$channel" = auto ] && {
  26                 channel=$(iw phy "$phy" info | \
  27                         sed -ne '/MHz/ { /disabled\|passive\|radar/d; s/.*\[//; s/\].*//; p; q }')
  28                 config_set "$device" channel "$channel"
  29         }
  30
  31         [ -n "$hwmode" ] && {
  32                 config_get hwmode_11n "$device" hwmode_11n
  33                 [ -n "$hwmode_11n" ] && {
  34                         hwmode="$hwmode_11n"
  35                         append base_cfg "ieee80211n=1" "$N"
  36                         config_get htmode "$device" htmode
  37                         config_get ht_capab_list "$device" ht_capab
  38                         case "$htmode" in
  39                                 HT20|HT40+|HT40-) ht_capab="[$htmode]";;
  40                                 *)ht_capab=;;
  41                         esac
  42                         for cap in $ht_capab_list; do
  43                                 ht_capab="$ht_capab[$cap]"
  44                         done
  45                         [ -n "$ht_capab" ] && append base_cfg "ht_capab=$ht_capab" "$N"
  46                 }
  47         }
  48
  49         local country_ie=0
  50         [ -n "$country" ] && country_ie=1
  51         config_get_bool country_ie "$device" country_ie "$country_ie"
  52         [ "$country_ie" -gt 0 ] && append base_cfg "ieee80211d=1" "$N"
  53
  54         config_get macfilter "$vif" macfilter
  55         case "$macfilter" in
  56                 allow)
  57                         append base_cfg "macaddr_acl=1" "$N"
  58                         append base_cfg "accept_mac_file=$macfile" "$N"
  59                         ;;
  60                 deny)
  61                         append base_cfg "macaddr_acl=0" "$N"
  62                         append base_cfg "deny_mac_file=$macfile" "$N"
  63                         ;;
  64         esac
  65         config_get maclist "$vif" maclist
  66         [ -n "$maclist" ] && {
  67                 for mac in $maclist; do
  68                         echo "$mac" >> $macfile
  69                 done
  70         }
  71
  72         local br brval brstr
  73         [ -n "$basic_rate_list" ] && {
  74                 for br in $basic_rate_list; do
  75                         brval="$(($br / 100))"
  76                         [ -n "$brstr" ] && brstr="$brstr "
  77                         brstr="$brstr$brval"
  78                 done
  79         }
  80
  81         append base_cfg "preamble=$short_preamble" "$N"
  82
  83         cat >> "$cfgfile" <<EOF
  84 ctrl_interface=/var/run/hostapd-$phy
  85 driver=nl80211
  86 wmm_ac_bk_cwmin=4
  87 wmm_ac_bk_cwmax=10
  88 wmm_ac_bk_aifs=7
  89 wmm_ac_bk_txop_limit=0
  90 wmm_ac_bk_acm=0
  91 wmm_ac_be_aifs=3
  92 wmm_ac_be_cwmin=4
  93 wmm_ac_be_cwmax=10
  94 wmm_ac_be_txop_limit=0
  95 wmm_ac_be_acm=0
  96 wmm_ac_vi_aifs=2
  97 wmm_ac_vi_cwmin=3
  98 wmm_ac_vi_cwmax=4
  99 wmm_ac_vi_txop_limit=94
 100 wmm_ac_vi_acm=0
 101 wmm_ac_vo_aifs=2
 102 wmm_ac_vo_cwmin=2
 103 wmm_ac_vo_cwmax=3
 104 wmm_ac_vo_txop_limit=47
 105 wmm_ac_vo_acm=0
 106 tx_queue_data3_aifs=7
 107 tx_queue_data3_cwmin=15
 108 tx_queue_data3_cwmax=1023
 109 tx_queue_data3_burst=0
 110 tx_queue_data2_aifs=3
 111 tx_queue_data2_cwmin=15
 112 tx_queue_data2_cwmax=63
 113 tx_queue_data2_burst=0
 114 tx_queue_data1_aifs=1
 115 tx_queue_data1_cwmin=7
 116 tx_queue_data1_cwmax=15
 117 tx_queue_data1_burst=3.0
 118 tx_queue_data0_aifs=1
 119 tx_queue_data0_cwmin=3
 120 tx_queue_data0_cwmax=7
 121 tx_queue_data0_burst=1.5
 122 ${hwmode:+hw_mode=$hwmode}
 123 ${channel:+channel=$channel}
 124 ${beacon_int:+beacon_int=$beacon_int}
 125 ${country:+country_code=$country}
 126 ${noscan:+noscan=$noscan}
 127 ${brstr:+basic_rates=$brstr}
 128 $base_cfg
 129
 130 EOF
 131 }
 132
 133 mac80211_hostapd_setup_bss() {
 134         local phy="$1"
 135         local vif="$2"
 136
 137         hostapd_cfg=
 138         cfgfile="/var/run/hostapd-$phy.conf"
 139         config_get ifname "$vif" ifname
 140
 141         if [ -f "$cfgfile" ]; then
 142                 append hostapd_cfg "bss=$ifname" "$N"
 143         else
 144                 mac80211_hostapd_setup_base "$phy" "$ifname"
 145                 append hostapd_cfg "interface=$ifname" "$N"
 146         fi
 147
 148         local net_cfg bridge
 149         net_cfg="$(find_net_config "$vif")"
 150         [ -z "$net_cfg" ] || bridge="$(bridge_interface "$net_cfg")"
 151         config_set "$vif" bridge "$bridge"
 152
 153         hostapd_set_bss_options hostapd_cfg "$vif"
 154
 155         config_get_bool wds "$vif" wds 0
 156         [ "$wds" -gt 0 ] && append hostapd_cfg "wds_sta=1" "$N"
 157
 158         local macaddr hidden maxassoc wmm
 159         config_get macaddr "$vif" macaddr
 160         config_get maxassoc "$vif" maxassoc
 161         config_get dtim_period "$vif" dtim_period
 162         config_get max_listen_int "$vif" max_listen_int
 163         config_get_bool hidden "$vif" hidden 0
 164         config_get_bool wmm "$vif" wmm 1
 165         cat >> /var/run/hostapd-$phy.conf <<EOF
 166 $hostapd_cfg
 167 wmm_enabled=$wmm
 168 bssid=$macaddr
 169 ignore_broadcast_ssid=$hidden
 170 ${dtim_period:+dtim_period=$dtim_period}
 171 ${max_listen_int:+max_listen_interval=$max_listen_int}
 172 ${maxassoc:+max_num_sta=$maxassoc}
 173 EOF
 174 }
 175
 176 mac80211_start_vif() {
 177         local vif="$1"
 178         local ifname="$2"
 179
 180         local net_cfg
 181         net_cfg="$(find_net_config "$vif")"
 182         [ -z "$net_cfg" ] || start_net "$ifname" "$net_cfg"
 183
 184         set_wifi_up "$vif" "$ifname"
 185 }
 186
 187 lookup_phy() {
 188         [ -n "$phy" ] && {
 189                 [ -d /sys/class/ieee80211/phy ] && return
 190         }
 191
 192         local devpath
 193         config_get devpath "$device" path
 194         [ -n "$devpath" -a -d "/sys/devices/$devpath/ieee80211" ] && {
 195                 phy="$(ls /sys/devices/$devpath/ieee80211 | grep -m 1 phy)"
 196                 [ -n "$phy" ] && return
 197         }
 198
 199         local macaddr="$(config_get "$device" macaddr | tr 'A-Z' 'a-z')"
 200         [ -n "$macaddr" ] && {
 201                 for _phy in $(ls /sys/class/ieee80211 2>/dev/null); do
 202                         [ "$macaddr" = "$(cat /sys/class/ieee80211/${_phy}/macaddress)" ] || continue
 203                         phy="$_phy"
 204                         return
 205                 done
 206         }
 207         phy=
 208         return
 209 }
 210
 211 find_mac80211_phy() {
 212         local device="$1"
 213
 214         config_get phy "$device" phy
 215         lookup_phy
 216         [ -n "$phy" -a -d "/sys/class/ieee80211/$phy" ] || {
 217                 echo "PHY for wifi device $1 not found"
 218                 return 1
 219         }
 220         config_set "$device" phy "$phy"
 221
 222         config_get macaddr "$device" macaddr
 223         [ -z "$macaddr" ] && {
 224                 config_set "$device" macaddr "$(cat /sys/class/ieee80211/${phy}/macaddress)"
 225         }
 226
 227         return 0
 228 }
 229
 230 scan_mac80211() {
 231         local device="$1"
 232         local adhoc sta ap monitor mesh disabled
 233
 234         config_get vifs "$device" vifs
 235         for vif in $vifs; do
 236                 config_get_bool disabled "$vif" disabled 0
 237                 [ $disabled = 0 ] || continue
 238
 239                 config_get mode "$vif" mode
 240                 case "$mode" in
 241                         adhoc|sta|ap|monitor|mesh)
 242                                 append $mode "$vif"
 243                         ;;
 244                         *) echo "$device($vif): Invalid mode, ignored."; continue;;
 245                 esac
 246         done
 247
 248         config_set "$device" vifs "${ap:+$ap }${adhoc:+$adhoc }${sta:+$sta }${monitor:+$monitor }${mesh:+$mesh}"
 249 }
 250
 251 list_phy_interfaces() {
 252         local phy="$1"
 253         if [ -d "/sys/class/ieee80211/${phy}/device/net" ]; then
 254                 ls "/sys/class/ieee80211/${phy}/device/net" 2>/dev/null;
 255         else
 256                 ls "/sys/class/ieee80211/${phy}/device" 2>/dev/null | grep net: | sed -e 's,net:,,g'
 257         fi
 258 }
 259
 260 disable_mac80211() (
 261         local device="$1"
 262
 263         find_mac80211_phy "$device" || return 0
 264         config_get phy "$device" phy
 265
 266         set_wifi_down "$device"
 267         # kill all running hostapd and wpa_supplicant processes that
 268         # are running on atheros/mac80211 vifs
 269         for pid in `pidof hostapd`; do
 270                 grep -E "$phy" /proc/$pid/cmdline >/dev/null && \
 271                         kill $pid
 272         done
 273
 274         include /lib/network
 275         for wdev in $(list_phy_interfaces "$phy"); do
 276                 [ -f "/var/run/$wdev.pid" ] && kill $(cat /var/run/$wdev.pid) >&/dev/null 2>&1
 277                 for pid in `pidof wpa_supplicant`; do
 278                         grep "$wdev" /proc/$pid/cmdline >/dev/null && \
 279                                 kill $pid
 280                 done
 281                 ifconfig "$wdev" down 2>/dev/null
 282                 unbridge "$dev"
 283                 iw dev "$wdev" del
 284         done
 285
 286         return 0
 287 )
 288
 289 get_freq() {
 290         local phy="$1"
 291         local chan="$2"
 292         iw "$phy" info | grep -E -m1 "(\* ${chan:-....} MHz${chan:+|\\[$chan\\]})" | grep MHz | awk '{print $2}'
 293 }
 294
 295 mac80211_generate_mac() {
 296         local off="$1"
 297         local mac="$2"
 298         local oIFS="$IFS"; IFS=":"; set -- $mac; IFS="$oIFS"
 299
 300         local b2mask=0x00
 301         [ $off -gt 0 ] && b2mask=0x02
 302
 303         printf "%02x:%s:%s:%s:%02x:%02x" \
 304                 $(( 0x$1 | $b2mask )) $2 $3 $4 \
 305                 $(( (0x$5 + ($off / 0x100)) % 0x100 )) \
 306                 $(( (0x$6 + $off) % 0x100 ))
 307 }
 308
 309 enable_mac80211() {
 310         local device="$1"
 311         config_get channel "$device" channel
 312         config_get vifs "$device" vifs
 313         config_get txpower "$device" txpower
 314         config_get country "$device" country
 315         config_get distance "$device" distance
 316         config_get txantenna "$device" txantenna all
 317         config_get rxantenna "$device" rxantenna all
 318         config_get antenna_gain "$device" antenna_gain 0
 319         config_get frag "$device" frag
 320         config_get rts "$device" rts
 321         find_mac80211_phy "$device" || return 0
 322         config_get phy "$device" phy
 323         local i=0
 324         local macidx=0
 325         local apidx=0
 326         fixed=""
 327         local hostapd_ctrl=""
 328
 329         [ -n "$country" ] && {
 330                 iw reg get | grep -q "^country $country:" || {
 331                         iw reg set "$country"
 332                         sleep 1
 333                 }
 334         }
 335
 336         config_get chanbw "$device" chanbw
 337         [ -n "$chanbw" -a -d /sys/kernel/debug/ieee80211/$phy/ath9k ] && echo "$chanbw" > /sys/kernel/debug/ieee80211/$phy/ath9k/chanbw
 338         [ -n "$chanbw" -a -d /sys/kernel/debug/ieee80211/$phy/ath5k ] && echo "$chanbw" > /sys/kernel/debug/ieee80211/$phy/ath5k/bwmode
 339
 340         [ "$channel" = "auto" -o "$channel" = "0" ] || {
 341                 fixed=1
 342         }
 343
 344         iw phy "$phy" set antenna $txantenna $rxantenna >/dev/null 2>&1
 345         iw phy "$phy" set antenna_gain $antenna_gain
 346
 347         [ -n "$distance" ] && iw phy "$phy" set distance "$distance"
 348         [ -n "$frag" ] && iw phy "$phy" set frag "${frag%%.*}"
 349         [ -n "$rts" ] && iw phy "$phy" set rts "${rts%%.*}"
 350
 351         export channel fixed
 352         # convert channel to frequency
 353         local freq="$(get_freq "$phy" "${fixed:+$channel}")"
 354
 355         wifi_fixup_hwmode "$device" "g"
 356         for vif in $vifs; do
 357                 config_get ifname "$vif" ifname
 358                 [ -n "$ifname" ] || {
 359                         [ $i -gt 0 ] && ifname="wlan${phy#phy}-$i" || ifname="wlan${phy#phy}"
 360                 }
 361                 config_set "$vif" ifname "$ifname"
 362
 363                 config_get mode "$vif" mode
 364                 config_get ssid "$vif" ssid
 365
 366                 # It is far easier to delete and create the desired interface
 367                 case "$mode" in
 368                         adhoc)
 369                                 iw phy "$phy" interface add "$ifname" type adhoc
 370                         ;;
 371                         ap)
 372                                 # Hostapd will handle recreating the interface and
 373                                 # it's accompanying monitor
 374                                 apidx="$(($apidx + 1))"
 375                                 [ "$apidx" -gt 1 ] || iw phy "$phy" interface add "$ifname" type managed
 376                         ;;
 377                         mesh)
 378                                 config_get mesh_id "$vif" mesh_id
 379                                 iw phy "$phy" interface add "$ifname" type mp mesh_id "$mesh_id"
 380                         ;;
 381                         monitor)
 382                                 iw phy "$phy" interface add "$ifname" type monitor
 383                         ;;
 384                         sta)
 385                                 local wdsflag
 386                                 config_get_bool wds "$vif" wds 0
 387                                 [ "$wds" -gt 0 ] && wdsflag="4addr on"
 388                                 iw phy "$phy" interface add "$ifname" type managed $wdsflag
 389                                 config_get_bool powersave "$vif" powersave 0
 390                                 [ "$powersave" -gt 0 ] && powersave="on" || powersave="off"
 391                                 iw "$ifname" set power_save "$powersave"
 392                         ;;
 393                 esac
 394
 395                 # All interfaces must have unique mac addresses
 396                 # which can either be explicitly set in the device
 397                 # section, or automatically generated
 398                 config_get macaddr "$device" macaddr
 399                 config_get vif_mac "$vif" macaddr
 400                 [ -n "$vif_mac" ] || {
 401                         vif_mac="$(mac80211_generate_mac $macidx $macaddr)"
 402                         macidx="$(($macidx + 1))"
 403                 }
 404                 [ "$mode" = "ap" ] || ifconfig "$ifname" hw ether "$vif_mac"
 405                 config_set "$vif" macaddr "$vif_mac"
 406
 407                 # !! ap !!
 408                 #
 409                 # ALL ap functionality will be passed to hostapd
 410                 #
 411                 # !! station !!
 412                 #
 413                 # ALL station functionality will be passed to wpa_supplicant
 414                 #
 415                 if [ ! "$mode" = "ap" ]; then
 416                         # We attempt to set the channel for all interfaces, although
 417                         # mac80211 may not support it or the driver might not yet
 418                         # for ap mode this is handled by hostapd
 419                         [ -n "$fixed" -a -n "$channel" ] && iw dev "$ifname" set channel "$channel"
 420                 fi
 421
 422                 i=$(($i + 1))
 423         done
 424
 425         local start_hostapd=
 426         rm -f /var/run/hostapd-$phy.conf
 427         for vif in $vifs; do
 428                 config_get mode "$vif" mode
 429                 [ "$mode" = "ap" ] || continue
 430                 mac80211_hostapd_setup_bss "$phy" "$vif"
 431                 start_hostapd=1
 432         done
 433
 434         [ -n "$start_hostapd" ] && {
 435                 hostapd -P /var/run/wifi-$phy.pid -B /var/run/hostapd-$phy.conf || {
 436                         echo "Failed to start hostapd for $phy"
 437                         return
 438                 }
 439                 sleep 2
 440
 441                 for vif in $vifs; do
 442                         config_get mode "$vif" mode
 443                         config_get ifname "$vif" ifname
 444                         [ "$mode" = "ap" ] || continue
 445                         hostapd_ctrl="${hostapd_ctrl:-/var/run/hostapd-$phy/$ifname}"
 446                         mac80211_start_vif "$vif" "$ifname"
 447                 done
 448         }
 449
 450         for vif in $vifs; do
 451                 config_get mode "$vif" mode
 452                 config_get ifname "$vif" ifname
 453                 [ "$mode" = "ap" ] || ifconfig "$ifname" up
 454
 455                 config_get vif_txpower "$vif" txpower
 456                 # use vif_txpower (from wifi-iface) to override txpower (from
 457                 # wifi-device) if the latter doesn't exist
 458                 txpower="${txpower:-$vif_txpower}"
 459                 [ -z "$txpower" ] || iw dev "$ifname" set txpower fixed "${txpower%%.*}00"
 460
 461                 case "$mode" in
 462                         adhoc)
 463                                 config_get bssid "$vif" bssid
 464                                 config_get ssid "$vif" ssid
 465                                 config_get beacon_int "$device" beacon_int
 466                                 config_get basic_rate_list "$device" basic_rate
 467                                 config_get encryption "$vif" encryption
 468                                 config_get key "$vif" key 1
 469                                 config_get mcast_rate "$vif" mcast_rate
 470                                 config_get htmode "$device" htmode
 471                                 case "$htmode" in
 472                                         HT20|HT40+|HT40-) ;;
 473                                         *) htmode= ;;
 474                                 esac
 475
 476
 477                                 local keyspec=""
 478                                 [ "$encryption" == "psk" -o "$encryption" == "psk2" ] && {
 479                                         if eval "type wpa_supplicant_setup_vif" 2>/dev/null >/dev/null; then
 480                                                 wpa_supplicant_setup_vif "$vif" nl80211 "${hostapd_ctrl:+-H $hostapd_ctrl}" $freq $htmode || {
 481                                                         echo "enable_mac80211($device): Failed to set up wpa_supplicant for interface $ifname" >&2
 482                                                         # make sure this wifi interface won't accidentally stay open without encryption
 483                                                         ifconfig "$ifname" down
 484                                                 }
 485                                                 # wpa_supplicant will bring the iface up
 486                                                 continue
 487                                         fi
 488                                 }
 489
 490                                 [ "$encryption" == "wep" ] && {
 491                                         case "$key" in
 492                                                 [1234])
 493                                                         local idx
 494                                                         for idx in 1 2 3 4; do
 495                                                                 local ikey
 496                                                                 config_get ikey "$vif" "key$idx"
 497
 498                                                                 [ -n "$ikey" ] && {
 499                                                                         ikey="$(($idx - 1)):$(prepare_key_wep "$ikey")"
 500                                                                         [ $idx -eq $key ] && ikey="d:$ikey"
 501                                                                         append keyspec "$ikey"
 502                                                                 }
 503                                                         done
 504                                                 ;;
 505                                                 *) append keyspec "d:0:$(prepare_key_wep "$key")" ;;
 506                                         esac
 507                                 }
 508
 509                                 local br brval brsub brstr
 510                                 [ -n "$basic_rate_list" ] && {
 511                                         for br in $basic_rate_list; do
 512                                                 brval="$(($br / 1000))"
 513                                                 brsub="$((($br / 100) % 10))"
 514                                                 [ "$brsub" -gt 0 ] && brval="$brval.$brsub"
 515                                                 [ -n "$brstr" ] && brstr="$brstr,"
 516                                                 brstr="$brstr$brval"
 517                                         done
 518                                 }
 519
 520                                 local mcval=""
 521                                 [ -n "$mcast_rate" ] && {
 522                                         mcval="$(($mcast_rate / 1000))"
 523                                         mcsub="$(( ($mcast_rate / 100) % 10 ))"
 524                                         [ "$mcsub" -gt 0 ] && mcval="$mcval.$mcsub"
 525                                 }
 526
 527                                 iw dev "$ifname" ibss join "$ssid" $freq $htmode \
 528                                         ${fixed:+fixed-freq} $bssid \
 529                                         ${beacon_int:+beacon-interval $beacon_int} \
 530                                         ${brstr:+basic-rates $brstr} \
 531                                         ${mcval:+mcast-rate $mcval} \
 532                                         ${keyspec:+keys $keyspec}
 533                         ;;
 534                         sta)
 535                                 if eval "type wpa_supplicant_setup_vif" 2>/dev/null >/dev/null; then
 536                                         wpa_supplicant_setup_vif "$vif" nl80211 "${hostapd_ctrl:+-H $hostapd_ctrl}" || {
 537                                                 echo "enable_mac80211($device): Failed to set up wpa_supplicant for interface $ifname" >&2
 538                                                 # make sure this wifi interface won't accidentally stay open without encryption
 539                                                 ifconfig "$ifname" down
 540                                                 continue
 541                                         }
 542                                 fi
 543                         ;;
 544                 esac
 545                 [ "$mode" = "ap" ] || mac80211_start_vif "$vif" "$ifname"
 546         done
 547
 548 }
 549
 550
 551 check_mac80211_device() {
 552         config_get phy "$1" phy
 553         [ -z "$phy" ] && {
 554                 find_mac80211_phy "$1" >/dev/null || return 0
 555                 config_get phy "$1" phy
 556         }
 557         [ "$phy" = "$dev" ] && found=1
 558 }
 559
 560 detect_mac80211() {
 561         devidx=0
 562         config_load wireless
 563         while :; do
 564                 config_get type "radio$devidx" type
 565                 [ -n "$type" ] || break
 566                 devidx=$(($devidx + 1))
 567         done
 568         for dev in $(ls /sys/class/ieee80211); do
 569                 found=0
 570                 config_foreach check_mac80211_device wifi-device
 571                 [ "$found" -gt 0 ] && continue
 572
 573                 mode_11n=""
 574                 mode_band="g"
 575                 channel="11"
 576                 ht_cap=0
 577                 for cap in $(iw phy "$dev" info | grep 'Capabilities:' | cut -d: -f2); do
 578                         ht_cap="$(($ht_cap | $cap))"
 579                 done
 580                 ht_capab="";
 581                 [ "$ht_cap" -gt 0 ] && {
 582                         mode_11n="n"
 583                         append ht_capab "       option htmode   HT20" "$N"
 584
 585                         list="  list ht_capab"
 586                         [ "$(($ht_cap & 1))" -eq 1 ] && append ht_capab "$list  LDPC" "$N"
 587                         [ "$(($ht_cap & 16))" -eq 16 ] && append ht_capab "$list        GF" "$N"
 588                         [ "$(($ht_cap & 32))" -eq 32 ] && append ht_capab "$list        SHORT-GI-20" "$N"
 589                         [ "$(($ht_cap & 64))" -eq 64 ] && append ht_capab "$list        SHORT-GI-40" "$N"
 590                         [ "$(($ht_cap & 128))" -eq 128 ] && append ht_capab "$list      TX-STBC" "$N"
 591                         [ "$(($ht_cap & 768))" -eq 256 ] && append ht_capab "$list      RX-STBC1" "$N"
 592                         [ "$(($ht_cap & 768))" -eq 512 ] && append ht_capab "$list      RX-STBC12" "$N"
 593                         [ "$(($ht_cap & 768))" -eq 768 ] && append ht_capab "$list      RX-STBC123" "$N"
 594                         [ "$(($ht_cap & 4096))" -eq 4096 ] && append ht_capab "$list    DSSS_CCK-40" "$N"
 595                 }
 596                 iw phy "$dev" info | grep -q '2412 MHz' || { mode_band="a"; channel="36"; }
 597
 598                 if [ -x /usr/bin/readlink ]; then
 599                         path="$(readlink -f /sys/class/ieee80211/${dev}/device)"
 600                         path="${path##/sys/devices/}"
 601                         dev_id="        option path     '$path'"
 602                 else
 603                         dev_id="        option macaddr  $(cat /sys/class/ieee80211/${dev}/macaddress)"
 604                 fi
 605
 606                 cat <<EOF
 607 config wifi-device  radio$devidx
 608         option type     mac80211
 609         option channel  ${channel}
 610         option hwmode   11${mode_11n}${mode_band}
 611 $dev_id
 612 $ht_capab
 613         # REMOVE THIS LINE TO ENABLE WIFI:
 614         option disabled 1
 615
 616 config wifi-iface
 617         option device   radio$devidx
 618         option network  lan
 619         option mode     ap
 620         option ssid     OpenWrt
 621         option encryption none
 622
 623 EOF
 624         devidx=$(($devidx + 1))
 625         done
 626 }
 627