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
  10         config_get device "$vif" device
  11         config_get country "$device" country
  12         config_get hwmode "$device" hwmode
  13         config_get channel "$device" channel
  14         config_get beacon_int "$device" beacon_int
  15         config_get basic_rate_list "$device" basic_rate
  16         config_get_bool noscan "$device" noscan
  17
  18         hostapd_set_log_options base_cfg "$device"
  19
  20         [ -n "$channel" -a -z "$hwmode" ] && wifi_fixup_hwmode "$device"
  21
  22         [ "$channel" = auto ] && {
  23                 channel=$(iw phy "$phy" info | \
  24                         sed -ne '/MHz/ { /disabled\|passive\|radar/d; s/.*\[//; s/\].*//; p; q }')
  25                 config_set "$device" channel "$channel"
  26         }
  27
  28         [ -n "$hwmode" ] && {
  29                 config_get hwmode_11n "$device" hwmode_11n
  30                 [ -n "$hwmode_11n" ] && {
  31                         hwmode="$hwmode_11n"
  32                         append base_cfg "ieee80211n=1" "$N"
  33                         config_get htmode "$device" htmode
  34                         config_get ht_capab_list "$device" ht_capab
  35                         case "$htmode" in
  36                                 HT20|HT40+|HT40-) ht_capab="[$htmode]";;
  37                                 *)ht_capab=;;
  38                         esac
  39                         for cap in $ht_capab_list; do
  40                                 ht_capab="$ht_capab[$cap]"
  41                         done
  42                         [ -n "$ht_capab" ] && append base_cfg "ht_capab=$ht_capab" "$N"
  43                 }
  44         }
  45
  46         local country_ie=0
  47         [ -n "$country" ] && country_ie=1
  48         config_get_bool country_ie "$device" country_ie "$country_ie"
  49         [ "$country_ie" -gt 0 ] && append base_cfg "ieee80211d=1" "$N"
  50
  51         local br brval brstr
  52         [ -n "$basic_rate_list" ] && {
  53                 for br in $basic_rate_list; do
  54                         brval="$(($br / 100))"
  55                         [ -n "$brstr" ] && brstr="$brstr "
  56                         brstr="$brstr$brval"
  57                 done
  58         }
  59
  60         cat >> "$cfgfile" <<EOF
  61 ctrl_interface=/var/run/hostapd-$phy
  62 driver=nl80211
  63 wmm_ac_bk_cwmin=4
  64 wmm_ac_bk_cwmax=10
  65 wmm_ac_bk_aifs=7
  66 wmm_ac_bk_txop_limit=0
  67 wmm_ac_bk_acm=0
  68 wmm_ac_be_aifs=3
  69 wmm_ac_be_cwmin=4
  70 wmm_ac_be_cwmax=10
  71 wmm_ac_be_txop_limit=0
  72 wmm_ac_be_acm=0
  73 wmm_ac_vi_aifs=2
  74 wmm_ac_vi_cwmin=3
  75 wmm_ac_vi_cwmax=4
  76 wmm_ac_vi_txop_limit=94
  77 wmm_ac_vi_acm=0
  78 wmm_ac_vo_aifs=2
  79 wmm_ac_vo_cwmin=2
  80 wmm_ac_vo_cwmax=3
  81 wmm_ac_vo_txop_limit=47
  82 wmm_ac_vo_acm=0
  83 tx_queue_data3_aifs=7
  84 tx_queue_data3_cwmin=15
  85 tx_queue_data3_cwmax=1023
  86 tx_queue_data3_burst=0
  87 tx_queue_data2_aifs=3
  88 tx_queue_data2_cwmin=15
  89 tx_queue_data2_cwmax=63
  90 tx_queue_data2_burst=0
  91 tx_queue_data1_aifs=1
  92 tx_queue_data1_cwmin=7
  93 tx_queue_data1_cwmax=15
  94 tx_queue_data1_burst=3.0
  95 tx_queue_data0_aifs=1
  96 tx_queue_data0_cwmin=3
  97 tx_queue_data0_cwmax=7
  98 tx_queue_data0_burst=1.5
  99 ${hwmode:+hw_mode=$hwmode}
 100 ${channel:+channel=$channel}
 101 ${beacon_int:+beacon_int=$beacon_int}
 102 ${country:+country_code=$country}
 103 ${noscan:+noscan=$noscan}
 104 ${brstr:+basic_rates=$brstr}
 105 $base_cfg
 106
 107 EOF
 108 }
 109
 110 mac80211_hostapd_setup_bss() {
 111         local phy="$1"
 112         local vif="$2"
 113
 114         hostapd_cfg=
 115         cfgfile="/var/run/hostapd-$phy.conf"
 116         config_get ifname "$vif" ifname
 117
 118         if [ -f "$cfgfile" ]; then
 119                 append hostapd_cfg "bss=$ifname" "$N"
 120         else
 121                 mac80211_hostapd_setup_base "$phy" "$ifname"
 122                 append hostapd_cfg "interface=$ifname" "$N"
 123         fi
 124
 125         local net_cfg bridge
 126         net_cfg="$(find_net_config "$vif")"
 127         [ -z "$net_cfg" ] || bridge="$(bridge_interface "$net_cfg")"
 128         config_set "$vif" bridge "$bridge"
 129
 130         hostapd_set_bss_options hostapd_cfg "$vif"
 131
 132         config_get_bool wds "$vif" wds 0
 133         [ "$wds" -gt 0 ] && append hostapd_cfg "wds_sta=1" "$N"
 134
 135         local macaddr hidden maxassoc wmm
 136         config_get macaddr "$vif" macaddr
 137         config_get maxassoc "$vif" maxassoc
 138         config_get dtim_period "$vif" dtim_period
 139         config_get max_listen_int "$vif" max_listen_int
 140         config_get_bool hidden "$vif" hidden 0
 141         config_get_bool wmm "$vif" wmm 1
 142         cat >> /var/run/hostapd-$phy.conf <<EOF
 143 $hostapd_cfg
 144 wmm_enabled=$wmm
 145 bssid=$macaddr
 146 ignore_broadcast_ssid=$hidden
 147 ${dtim_period:+dtim_period=$dtim_period}
 148 ${max_listen_int:+max_listen_interval=$max_listen_int}
 149 ${maxassoc:+max_num_sta=$maxassoc}
 150 EOF
 151 }
 152
 153 mac80211_start_vif() {
 154         local vif="$1"
 155         local ifname="$2"
 156
 157         local net_cfg
 158         net_cfg="$(find_net_config "$vif")"
 159         [ -z "$net_cfg" ] || start_net "$ifname" "$net_cfg"
 160
 161         set_wifi_up "$vif" "$ifname"
 162 }
 163
 164 lookup_phy() {
 165         [ -n "$phy" ] && {
 166                 [ -d /sys/class/ieee80211/$phy ] && return
 167         }
 168
 169         local devpath
 170         config_get devpath "$device" path
 171         [ -n "$devpath" -a -d "/sys/devices/$devpath/ieee80211" ] && {
 172                 phy="$(ls /sys/devices/$devpath/ieee80211 | grep -m 1 phy)"
 173                 [ -n "$phy" ] && return
 174         }
 175
 176         local macaddr="$(config_get "$device" macaddr | tr 'A-Z' 'a-z')"
 177         [ -n "$macaddr" ] && {
 178                 for _phy in $(ls /sys/class/ieee80211 2>/dev/null); do
 179                         [ "$macaddr" = "$(cat /sys/class/ieee80211/${_phy}/macaddress)" ] || continue
 180                         phy="$_phy"
 181                         return
 182                 done
 183         }
 184         phy=
 185         return
 186 }
 187
 188 find_mac80211_phy() {
 189         local device="$1"
 190
 191         config_get phy "$device" phy
 192         lookup_phy
 193         [ -n "$phy" -a -d "/sys/class/ieee80211/$phy" ] || {
 194                 echo "PHY for wifi device $1 not found"
 195                 return 1
 196         }
 197         config_set "$device" phy "$phy"
 198
 199         config_get macaddr "$device" macaddr
 200         [ -z "$macaddr" ] && {
 201                 config_set "$device" macaddr "$(cat /sys/class/ieee80211/${phy}/macaddress)"
 202         }
 203
 204         return 0
 205 }
 206
 207 scan_mac80211() {
 208         local device="$1"
 209         local adhoc sta ap monitor mesh disabled
 210
 211         config_get vifs "$device" vifs
 212         for vif in $vifs; do
 213                 config_get_bool disabled "$vif" disabled 0
 214                 [ $disabled = 0 ] || continue
 215
 216                 config_get mode "$vif" mode
 217                 case "$mode" in
 218                         adhoc|sta|ap|monitor|mesh)
 219                                 append $mode "$vif"
 220                         ;;
 221                         *) echo "$device($vif): Invalid mode, ignored."; continue;;
 222                 esac
 223         done
 224
 225         config_set "$device" vifs "${ap:+$ap }${adhoc:+$adhoc }${sta:+$sta }${monitor:+$monitor }${mesh:+$mesh}"
 226 }
 227
 228 list_phy_interfaces() {
 229         local phy="$1"
 230         if [ -d "/sys/class/ieee80211/${phy}/device/net" ]; then
 231                 ls "/sys/class/ieee80211/${phy}/device/net" 2>/dev/null;
 232         else
 233                 ls "/sys/class/ieee80211/${phy}/device" 2>/dev/null | grep net: | sed -e 's,net:,,g'
 234         fi
 235 }
 236
 237 disable_mac80211() (
 238         local device="$1"
 239
 240         find_mac80211_phy "$device" || return 0
 241         config_get phy "$device" phy
 242
 243         set_wifi_down "$device"
 244         # kill all running hostapd and wpa_supplicant processes that
 245         # are running on atheros/mac80211 vifs
 246         for pid in `pidof hostapd`; do
 247                 grep -E "$phy" /proc/$pid/cmdline >/dev/null && \
 248                         kill $pid
 249         done
 250
 251         include /lib/network
 252         for wdev in $(list_phy_interfaces "$phy"); do
 253                 [ -f "/var/run/$wdev.pid" ] && kill $(cat /var/run/$wdev.pid) >&/dev/null 2>&1
 254                 for pid in `pidof wpa_supplicant`; do
 255                         grep "$wdev" /proc/$pid/cmdline >/dev/null && \
 256                                 kill $pid
 257                 done
 258                 ifconfig "$wdev" down 2>/dev/null
 259                 unbridge "$dev"
 260                 iw dev "$wdev" del
 261         done
 262
 263         return 0
 264 )
 265
 266 get_freq() {
 267         local phy="$1"
 268         local chan="$2"
 269         iw "$phy" info | grep -E -m1 "(\* ${chan:-....} MHz${chan:+|\\[$chan\\]})" | grep MHz | awk '{print $2}'
 270 }
 271
 272 mac80211_generate_mac() {
 273         local id="$1"
 274         local ref="$2"
 275         local mask="$3"
 276
 277         [ "$mask" = "00:00:00:00:00:00" ] && mask="ff:ff:ff:ff:ff:ff";
 278         local oIFS="$IFS"; IFS=":"; set -- $mask; IFS="$oIFS"
 279
 280         local mask1=$1
 281         local mask6=$6
 282
 283         local oIFS="$IFS"; IFS=":"; set -- $ref; IFS="$oIFS"
 284         [ "$((0x$mask1))" -gt 0 ] && {
 285                 b1=$(((0x$1 | 0x2) ^ ($id << 2)))
 286                 printf "%02x:%s:%s:%s:%s:%s" $b1 $2 $3 $4 $5 $6
 287                 return
 288         }
 289
 290         [ "$((0x$mask6))" -lt 255 ] && {
 291                 printf "%s:%s:%s:%s:%s:%02x" $1 $2 $3 $4 $5 $(( 0x$6 ^ $id ))
 292                 return
 293         }
 294
 295         off2=$(( (0x$6 + $id) / 0x100 ))
 296         printf "%s:%s:%s:%s:%02x:%02x" \
 297                 $1 $2 $3 $4 \
 298                 $(( (0x$5 + $off2) % 0x100 )) \
 299                 $(( (0x$6 + $id) % 0x100 ))
 300 }
 301
 302 enable_mac80211() {
 303         local device="$1"
 304         config_get channel "$device" channel
 305         config_get vifs "$device" vifs
 306         config_get txpower "$device" txpower
 307         config_get country "$device" country
 308         config_get distance "$device" distance
 309         config_get txantenna "$device" txantenna all
 310         config_get rxantenna "$device" rxantenna all
 311         config_get antenna_gain "$device" antenna_gain 0
 312         config_get frag "$device" frag
 313         config_get rts "$device" rts
 314         find_mac80211_phy "$device" || return 0
 315         config_get phy "$device" phy
 316         local i=0
 317         local macidx=0
 318         local apidx=0
 319         fixed=""
 320         local hostapd_ctrl=""
 321
 322         [ -n "$country" ] && {
 323                 iw reg get | grep -q "^country $country:" || {
 324                         iw reg set "$country"
 325                         sleep 1
 326                 }
 327         }
 328
 329         config_get chanbw "$device" chanbw
 330         [ -n "$chanbw" -a -d /sys/kernel/debug/ieee80211/$phy/ath9k ] && echo "$chanbw" > /sys/kernel/debug/ieee80211/$phy/ath9k/chanbw
 331         [ -n "$chanbw" -a -d /sys/kernel/debug/ieee80211/$phy/ath5k ] && echo "$chanbw" > /sys/kernel/debug/ieee80211/$phy/ath5k/bwmode
 332
 333         [ "$channel" = "auto" -o "$channel" = "0" ] || {
 334                 fixed=1
 335         }
 336
 337         iw phy "$phy" set antenna $txantenna $rxantenna >/dev/null 2>&1
 338         iw phy "$phy" set antenna_gain $antenna_gain
 339
 340         [ -n "$distance" ] && iw phy "$phy" set distance "$distance"
 341         [ -n "$frag" ] && iw phy "$phy" set frag "${frag%%.*}"
 342         [ -n "$rts" ] && iw phy "$phy" set rts "${rts%%.*}"
 343
 344         export channel fixed
 345         # convert channel to frequency
 346         local freq="$(get_freq "$phy" "${fixed:+$channel}")"
 347
 348         wifi_fixup_hwmode "$device" "g"
 349         for vif in $vifs; do
 350                 config_get ifname "$vif" ifname
 351                 [ -n "$ifname" ] || {
 352                         [ $i -gt 0 ] && ifname="wlan${phy#phy}-$i" || ifname="wlan${phy#phy}"
 353                 }
 354                 config_set "$vif" ifname "$ifname"
 355
 356                 config_get mode "$vif" mode
 357                 config_get ssid "$vif" ssid
 358
 359                 # It is far easier to delete and create the desired interface
 360                 case "$mode" in
 361                         adhoc)
 362                                 iw phy "$phy" interface add "$ifname" type adhoc
 363                         ;;
 364                         ap)
 365                                 # Hostapd will handle recreating the interface and
 366                                 # it's accompanying monitor
 367                                 apidx="$(($apidx + 1))"
 368                                 [ "$apidx" -gt 1 ] || iw phy "$phy" interface add "$ifname" type managed
 369                         ;;
 370                         mesh)
 371                                 config_get mesh_id "$vif" mesh_id
 372                                 iw phy "$phy" interface add "$ifname" type mp mesh_id "$mesh_id"
 373                         ;;
 374                         monitor)
 375                                 iw phy "$phy" interface add "$ifname" type monitor
 376                         ;;
 377                         sta)
 378                                 local wdsflag
 379                                 config_get_bool wds "$vif" wds 0
 380                                 [ "$wds" -gt 0 ] && wdsflag="4addr on"
 381                                 iw phy "$phy" interface add "$ifname" type managed $wdsflag
 382                                 config_get_bool powersave "$vif" powersave 0
 383                                 [ "$powersave" -gt 0 ] && powersave="on" || powersave="off"
 384                                 iw "$ifname" set power_save "$powersave"
 385                         ;;
 386                 esac
 387
 388                 # All interfaces must have unique mac addresses
 389                 # which can either be explicitly set in the device
 390                 # section, or automatically generated
 391                 config_get macaddr "$device" macaddr
 392                 config_get vif_mac "$vif" macaddr
 393                 [ -n "$vif_mac" ] || {
 394                         vif_mac="$(mac80211_generate_mac $macidx $macaddr $(cat /sys/class/ieee80211/${phy}/address_mask))"
 395                         macidx="$(($macidx + 1))"
 396                 }
 397                 [ "$mode" = "ap" ] || ifconfig "$ifname" hw ether "$vif_mac"
 398                 config_set "$vif" macaddr "$vif_mac"
 399
 400                 # !! ap !!
 401                 #
 402                 # ALL ap functionality will be passed to hostapd
 403                 #
 404                 # !! station !!
 405                 #
 406                 # ALL station functionality will be passed to wpa_supplicant
 407                 #
 408                 if [ ! "$mode" = "ap" ]; then
 409                         # We attempt to set the channel for all interfaces, although
 410                         # mac80211 may not support it or the driver might not yet
 411                         # for ap mode this is handled by hostapd
 412                         [ -n "$fixed" -a -n "$channel" ] && iw dev "$ifname" set channel "$channel"
 413                 fi
 414
 415                 i=$(($i + 1))
 416         done
 417
 418         local start_hostapd=
 419         rm -f /var/run/hostapd-$phy.conf
 420         for vif in $vifs; do
 421                 config_get mode "$vif" mode
 422                 [ "$mode" = "ap" ] || continue
 423                 mac80211_hostapd_setup_bss "$phy" "$vif"
 424                 start_hostapd=1
 425         done
 426
 427         [ -n "$start_hostapd" ] && {
 428                 hostapd -P /var/run/wifi-$phy.pid -B /var/run/hostapd-$phy.conf || {
 429                         echo "Failed to start hostapd for $phy"
 430                         return
 431                 }
 432                 sleep 2
 433
 434                 for vif in $vifs; do
 435                         config_get mode "$vif" mode
 436                         config_get ifname "$vif" ifname
 437                         [ "$mode" = "ap" ] || continue
 438                         hostapd_ctrl="${hostapd_ctrl:-/var/run/hostapd-$phy/$ifname}"
 439                         mac80211_start_vif "$vif" "$ifname"
 440                 done
 441         }
 442
 443         for vif in $vifs; do
 444                 config_get mode "$vif" mode
 445                 config_get ifname "$vif" ifname
 446                 [ "$mode" = "ap" ] || ifconfig "$ifname" up
 447
 448                 config_get vif_txpower "$vif" txpower
 449                 # use vif_txpower (from wifi-iface) to override txpower (from
 450                 # wifi-device) if the latter doesn't exist
 451                 txpower="${txpower:-$vif_txpower}"
 452                 [ -z "$txpower" ] || iw dev "$ifname" set txpower fixed "${txpower%%.*}00"
 453
 454                 case "$mode" in
 455                         adhoc)
 456                                 config_get bssid "$vif" bssid
 457                                 config_get ssid "$vif" ssid
 458                                 config_get beacon_int "$device" beacon_int
 459                                 config_get basic_rate_list "$device" basic_rate
 460                                 config_get encryption "$vif" encryption
 461                                 config_get key "$vif" key 1
 462                                 config_get mcast_rate "$vif" mcast_rate
 463                                 config_get htmode "$device" htmode
 464                                 case "$htmode" in
 465                                         HT20|HT40+|HT40-) ;;
 466                                         *) htmode= ;;
 467                                 esac
 468
 469
 470                                 local keyspec=""
 471                                 [ "$encryption" == "psk" -o "$encryption" == "psk2" ] && {
 472                                         if eval "type wpa_supplicant_setup_vif" 2>/dev/null >/dev/null; then
 473                                                 wpa_supplicant_setup_vif "$vif" nl80211 "${hostapd_ctrl:+-H $hostapd_ctrl}" $freq $htmode || {
 474                                                         echo "enable_mac80211($device): Failed to set up wpa_supplicant for interface $ifname" >&2
 475                                                         # make sure this wifi interface won't accidentally stay open without encryption
 476                                                         ifconfig "$ifname" down
 477                                                 }
 478                                                 mac80211_start_vif "$vif" "$ifname"
 479                                                 continue
 480                                         fi
 481                                 }
 482
 483                                 [ "$encryption" == "wep" ] && {
 484                                         case "$key" in
 485                                                 [1234])
 486                                                         local idx
 487                                                         for idx in 1 2 3 4; do
 488                                                                 local ikey
 489                                                                 config_get ikey "$vif" "key$idx"
 490
 491                                                                 [ -n "$ikey" ] && {
 492                                                                         ikey="$(($idx - 1)):$(prepare_key_wep "$ikey")"
 493                                                                         [ $idx -eq $key ] && ikey="d:$ikey"
 494                                                                         append keyspec "$ikey"
 495                                                                 }
 496                                                         done
 497                                                 ;;
 498                                                 *) append keyspec "d:0:$(prepare_key_wep "$key")" ;;
 499                                         esac
 500                                 }
 501
 502                                 local br brval brsub brstr
 503                                 [ -n "$basic_rate_list" ] && {
 504                                         for br in $basic_rate_list; do
 505                                                 brval="$(($br / 1000))"
 506                                                 brsub="$((($br / 100) % 10))"
 507                                                 [ "$brsub" -gt 0 ] && brval="$brval.$brsub"
 508                                                 [ -n "$brstr" ] && brstr="$brstr,"
 509                                                 brstr="$brstr$brval"
 510                                         done
 511                                 }
 512
 513                                 local mcval=""
 514                                 [ -n "$mcast_rate" ] && {
 515                                         mcval="$(($mcast_rate / 1000))"
 516                                         mcsub="$(( ($mcast_rate / 100) % 10 ))"
 517                                         [ "$mcsub" -gt 0 ] && mcval="$mcval.$mcsub"
 518                                 }
 519
 520                                 iw dev "$ifname" ibss join "$ssid" $freq $htmode \
 521                                         ${fixed:+fixed-freq} $bssid \
 522                                         ${beacon_int:+beacon-interval $beacon_int} \
 523                                         ${brstr:+basic-rates $brstr} \
 524                                         ${mcval:+mcast-rate $mcval} \
 525                                         ${keyspec:+keys $keyspec}
 526                         ;;
 527                         sta)
 528                                 if eval "type wpa_supplicant_setup_vif" 2>/dev/null >/dev/null; then
 529                                         wpa_supplicant_setup_vif "$vif" nl80211 "${hostapd_ctrl:+-H $hostapd_ctrl}" || {
 530                                                 echo "enable_mac80211($device): Failed to set up wpa_supplicant for interface $ifname" >&2
 531                                                 # make sure this wifi interface won't accidentally stay open without encryption
 532                                                 ifconfig "$ifname" down
 533                                                 continue
 534                                         }
 535                                 fi
 536                         ;;
 537                 esac
 538                 [ "$mode" = "ap" ] || mac80211_start_vif "$vif" "$ifname"
 539         done
 540
 541 }
 542
 543
 544 check_mac80211_device() {
 545         config_get phy "$1" phy
 546         [ -z "$phy" ] && {
 547                 find_mac80211_phy "$1" >/dev/null || return 0
 548                 config_get phy "$1" phy
 549         }
 550         [ "$phy" = "$dev" ] && found=1
 551 }
 552
 553 detect_mac80211() {
 554         devidx=0
 555         config_load wireless
 556         while :; do
 557                 config_get type "radio$devidx" type
 558                 [ -n "$type" ] || break
 559                 devidx=$(($devidx + 1))
 560         done
 561         for dev in $(ls /sys/class/ieee80211); do
 562                 found=0
 563                 config_foreach check_mac80211_device wifi-device
 564                 [ "$found" -gt 0 ] && continue
 565
 566                 mode_11n=""
 567                 mode_band="g"
 568                 channel="11"
 569                 ht_cap=0
 570                 for cap in $(iw phy "$dev" info | grep 'Capabilities:' | cut -d: -f2); do
 571                         ht_cap="$(($ht_cap | $cap))"
 572                 done
 573                 ht_capab="";
 574                 [ "$ht_cap" -gt 0 ] && {
 575                         mode_11n="n"
 576                         append ht_capab "       option htmode   HT20" "$N"
 577
 578                         list="  list ht_capab"
 579                         [ "$(($ht_cap & 1))" -eq 1 ] && append ht_capab "$list  LDPC" "$N"
 580                         [ "$(($ht_cap & 16))" -eq 16 ] && append ht_capab "$list        GF" "$N"
 581                         [ "$(($ht_cap & 32))" -eq 32 ] && append ht_capab "$list        SHORT-GI-20" "$N"
 582                         [ "$(($ht_cap & 64))" -eq 64 ] && append ht_capab "$list        SHORT-GI-40" "$N"
 583                         [ "$(($ht_cap & 128))" -eq 128 ] && append ht_capab "$list      TX-STBC" "$N"
 584                         [ "$(($ht_cap & 768))" -eq 256 ] && append ht_capab "$list      RX-STBC1" "$N"
 585                         [ "$(($ht_cap & 768))" -eq 512 ] && append ht_capab "$list      RX-STBC12" "$N"
 586                         [ "$(($ht_cap & 768))" -eq 768 ] && append ht_capab "$list      RX-STBC123" "$N"
 587                         [ "$(($ht_cap & 4096))" -eq 4096 ] && append ht_capab "$list    DSSS_CCK-40" "$N"
 588                 }
 589                 iw phy "$dev" info | grep -q '2412 MHz' || { mode_band="a"; channel="36"; }
 590
 591                 if [ -x /usr/bin/readlink ]; then
 592                         path="$(readlink -f /sys/class/ieee80211/${dev}/device)"
 593                         path="${path##/sys/devices/}"
 594                         dev_id="        option path     '$path'"
 595                 else
 596                         dev_id="        option macaddr  $(cat /sys/class/ieee80211/${dev}/macaddress)"
 597                 fi
 598
 599                 cat <<EOF
 600 config wifi-device  radio$devidx
 601         option type     mac80211
 602         option channel  ${channel}
 603         option hwmode   11${mode_11n}${mode_band}
 604 $dev_id
 605 $ht_capab
 606         # REMOVE THIS LINE TO ENABLE WIFI:
 607         option disabled 1
 608
 609 config wifi-iface
 610         option device   radio$devidx
 611         option network  lan
 612         option mode     ap
 613         option ssid     OpenWrt
 614         option encryption none
 615
 616 EOF
 617         devidx=$(($devidx + 1))
 618         done
 619 }
 620