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 off="$1"
 274         local mac="$2"
 275         local mask="$3"
 276         local oIFS="$IFS"; IFS=":"; set -- $mac; IFS="$oIFS"
 277
 278         local b2mask=0x00
 279         [ $off -gt 0 ] &&
 280                 [ "$mask" = "00:00:00:00:00:00" -o $(( 0x${mask%%:*} & 0x2 )) -gt 0 ] && b2mask=0x02
 281
 282         printf "%02x:%s:%s:%s:%02x:%02x" \
 283                 $(( 0x$1 | $b2mask )) $2 $3 $4 \
 284                 $(( (0x$5 + ($off / 0x100)) % 0x100 )) \
 285                 $(( (0x$6 + $off) % 0x100 ))
 286 }
 287
 288 enable_mac80211() {
 289         local device="$1"
 290         config_get channel "$device" channel
 291         config_get vifs "$device" vifs
 292         config_get txpower "$device" txpower
 293         config_get country "$device" country
 294         config_get distance "$device" distance
 295         config_get txantenna "$device" txantenna all
 296         config_get rxantenna "$device" rxantenna all
 297         config_get antenna_gain "$device" antenna_gain 0
 298         config_get frag "$device" frag
 299         config_get rts "$device" rts
 300         find_mac80211_phy "$device" || return 0
 301         config_get phy "$device" phy
 302         local i=0
 303         local macidx=0
 304         local apidx=0
 305         fixed=""
 306         local hostapd_ctrl=""
 307
 308         [ -n "$country" ] && {
 309                 iw reg get | grep -q "^country $country:" || {
 310                         iw reg set "$country"
 311                         sleep 1
 312                 }
 313         }
 314
 315         config_get chanbw "$device" chanbw
 316         [ -n "$chanbw" -a -d /sys/kernel/debug/ieee80211/$phy/ath9k ] && echo "$chanbw" > /sys/kernel/debug/ieee80211/$phy/ath9k/chanbw
 317         [ -n "$chanbw" -a -d /sys/kernel/debug/ieee80211/$phy/ath5k ] && echo "$chanbw" > /sys/kernel/debug/ieee80211/$phy/ath5k/bwmode
 318
 319         [ "$channel" = "auto" -o "$channel" = "0" ] || {
 320                 fixed=1
 321         }
 322
 323         iw phy "$phy" set antenna $txantenna $rxantenna >/dev/null 2>&1
 324         iw phy "$phy" set antenna_gain $antenna_gain
 325
 326         [ -n "$distance" ] && iw phy "$phy" set distance "$distance"
 327         [ -n "$frag" ] && iw phy "$phy" set frag "${frag%%.*}"
 328         [ -n "$rts" ] && iw phy "$phy" set rts "${rts%%.*}"
 329
 330         export channel fixed
 331         # convert channel to frequency
 332         local freq="$(get_freq "$phy" "${fixed:+$channel}")"
 333
 334         wifi_fixup_hwmode "$device" "g"
 335         for vif in $vifs; do
 336                 config_get ifname "$vif" ifname
 337                 [ -n "$ifname" ] || {
 338                         [ $i -gt 0 ] && ifname="wlan${phy#phy}-$i" || ifname="wlan${phy#phy}"
 339                 }
 340                 config_set "$vif" ifname "$ifname"
 341
 342                 config_get mode "$vif" mode
 343                 config_get ssid "$vif" ssid
 344
 345                 # It is far easier to delete and create the desired interface
 346                 case "$mode" in
 347                         adhoc)
 348                                 iw phy "$phy" interface add "$ifname" type adhoc
 349                         ;;
 350                         ap)
 351                                 # Hostapd will handle recreating the interface and
 352                                 # it's accompanying monitor
 353                                 apidx="$(($apidx + 1))"
 354                                 [ "$apidx" -gt 1 ] || iw phy "$phy" interface add "$ifname" type managed
 355                         ;;
 356                         mesh)
 357                                 config_get mesh_id "$vif" mesh_id
 358                                 iw phy "$phy" interface add "$ifname" type mp mesh_id "$mesh_id"
 359                         ;;
 360                         monitor)
 361                                 iw phy "$phy" interface add "$ifname" type monitor
 362                         ;;
 363                         sta)
 364                                 local wdsflag
 365                                 config_get_bool wds "$vif" wds 0
 366                                 [ "$wds" -gt 0 ] && wdsflag="4addr on"
 367                                 iw phy "$phy" interface add "$ifname" type managed $wdsflag
 368                                 config_get_bool powersave "$vif" powersave 0
 369                                 [ "$powersave" -gt 0 ] && powersave="on" || powersave="off"
 370                                 iw "$ifname" set power_save "$powersave"
 371                         ;;
 372                 esac
 373
 374                 # All interfaces must have unique mac addresses
 375                 # which can either be explicitly set in the device
 376                 # section, or automatically generated
 377                 config_get macaddr "$device" macaddr
 378                 config_get vif_mac "$vif" macaddr
 379                 [ -n "$vif_mac" ] || {
 380                         vif_mac="$(mac80211_generate_mac $macidx $macaddr $(cat /sys/class/ieee80211/${phy}/address_mask))"
 381                         macidx="$(($macidx + 1))"
 382                 }
 383                 [ "$mode" = "ap" ] || ifconfig "$ifname" hw ether "$vif_mac"
 384                 config_set "$vif" macaddr "$vif_mac"
 385
 386                 # !! ap !!
 387                 #
 388                 # ALL ap functionality will be passed to hostapd
 389                 #
 390                 # !! station !!
 391                 #
 392                 # ALL station functionality will be passed to wpa_supplicant
 393                 #
 394                 if [ ! "$mode" = "ap" ]; then
 395                         # We attempt to set the channel for all interfaces, although
 396                         # mac80211 may not support it or the driver might not yet
 397                         # for ap mode this is handled by hostapd
 398                         [ -n "$fixed" -a -n "$channel" ] && iw dev "$ifname" set channel "$channel"
 399                 fi
 400
 401                 i=$(($i + 1))
 402         done
 403
 404         local start_hostapd=
 405         rm -f /var/run/hostapd-$phy.conf
 406         for vif in $vifs; do
 407                 config_get mode "$vif" mode
 408                 [ "$mode" = "ap" ] || continue
 409                 mac80211_hostapd_setup_bss "$phy" "$vif"
 410                 start_hostapd=1
 411         done
 412
 413         [ -n "$start_hostapd" ] && {
 414                 hostapd -P /var/run/wifi-$phy.pid -B /var/run/hostapd-$phy.conf || {
 415                         echo "Failed to start hostapd for $phy"
 416                         return
 417                 }
 418                 sleep 2
 419
 420                 for vif in $vifs; do
 421                         config_get mode "$vif" mode
 422                         config_get ifname "$vif" ifname
 423                         [ "$mode" = "ap" ] || continue
 424                         hostapd_ctrl="${hostapd_ctrl:-/var/run/hostapd-$phy/$ifname}"
 425                         mac80211_start_vif "$vif" "$ifname"
 426                 done
 427         }
 428
 429         for vif in $vifs; do
 430                 config_get mode "$vif" mode
 431                 config_get ifname "$vif" ifname
 432                 [ "$mode" = "ap" ] || ifconfig "$ifname" up
 433
 434                 config_get vif_txpower "$vif" txpower
 435                 # use vif_txpower (from wifi-iface) to override txpower (from
 436                 # wifi-device) if the latter doesn't exist
 437                 txpower="${txpower:-$vif_txpower}"
 438                 [ -z "$txpower" ] || iw dev "$ifname" set txpower fixed "${txpower%%.*}00"
 439
 440                 case "$mode" in
 441                         adhoc)
 442                                 config_get bssid "$vif" bssid
 443                                 config_get ssid "$vif" ssid
 444                                 config_get beacon_int "$device" beacon_int
 445                                 config_get basic_rate_list "$device" basic_rate
 446                                 config_get encryption "$vif" encryption
 447                                 config_get key "$vif" key 1
 448                                 config_get mcast_rate "$vif" mcast_rate
 449                                 config_get htmode "$device" htmode
 450                                 case "$htmode" in
 451                                         HT20|HT40+|HT40-) ;;
 452                                         *) htmode= ;;
 453                                 esac
 454
 455
 456                                 local keyspec=""
 457                                 [ "$encryption" == "psk" -o "$encryption" == "psk2" ] && {
 458                                         if eval "type wpa_supplicant_setup_vif" 2>/dev/null >/dev/null; then
 459                                                 wpa_supplicant_setup_vif "$vif" nl80211 "${hostapd_ctrl:+-H $hostapd_ctrl}" $freq $htmode || {
 460                                                         echo "enable_mac80211($device): Failed to set up wpa_supplicant for interface $ifname" >&2
 461                                                         # make sure this wifi interface won't accidentally stay open without encryption
 462                                                         ifconfig "$ifname" down
 463                                                 }
 464                                                 mac80211_start_vif "$vif" "$ifname"
 465                                                 continue
 466                                         fi
 467                                 }
 468
 469                                 [ "$encryption" == "wep" ] && {
 470                                         case "$key" in
 471                                                 [1234])
 472                                                         local idx
 473                                                         for idx in 1 2 3 4; do
 474                                                                 local ikey
 475                                                                 config_get ikey "$vif" "key$idx"
 476
 477                                                                 [ -n "$ikey" ] && {
 478                                                                         ikey="$(($idx - 1)):$(prepare_key_wep "$ikey")"
 479                                                                         [ $idx -eq $key ] && ikey="d:$ikey"
 480                                                                         append keyspec "$ikey"
 481                                                                 }
 482                                                         done
 483                                                 ;;
 484                                                 *) append keyspec "d:0:$(prepare_key_wep "$key")" ;;
 485                                         esac
 486                                 }
 487
 488                                 local br brval brsub brstr
 489                                 [ -n "$basic_rate_list" ] && {
 490                                         for br in $basic_rate_list; do
 491                                                 brval="$(($br / 1000))"
 492                                                 brsub="$((($br / 100) % 10))"
 493                                                 [ "$brsub" -gt 0 ] && brval="$brval.$brsub"
 494                                                 [ -n "$brstr" ] && brstr="$brstr,"
 495                                                 brstr="$brstr$brval"
 496                                         done
 497                                 }
 498
 499                                 local mcval=""
 500                                 [ -n "$mcast_rate" ] && {
 501                                         mcval="$(($mcast_rate / 1000))"
 502                                         mcsub="$(( ($mcast_rate / 100) % 10 ))"
 503                                         [ "$mcsub" -gt 0 ] && mcval="$mcval.$mcsub"
 504                                 }
 505
 506                                 iw dev "$ifname" ibss join "$ssid" $freq $htmode \
 507                                         ${fixed:+fixed-freq} $bssid \
 508                                         ${beacon_int:+beacon-interval $beacon_int} \
 509                                         ${brstr:+basic-rates $brstr} \
 510                                         ${mcval:+mcast-rate $mcval} \
 511                                         ${keyspec:+keys $keyspec}
 512                         ;;
 513                         sta)
 514                                 if eval "type wpa_supplicant_setup_vif" 2>/dev/null >/dev/null; then
 515                                         wpa_supplicant_setup_vif "$vif" nl80211 "${hostapd_ctrl:+-H $hostapd_ctrl}" || {
 516                                                 echo "enable_mac80211($device): Failed to set up wpa_supplicant for interface $ifname" >&2
 517                                                 # make sure this wifi interface won't accidentally stay open without encryption
 518                                                 ifconfig "$ifname" down
 519                                                 continue
 520                                         }
 521                                 fi
 522                         ;;
 523                 esac
 524                 [ "$mode" = "ap" ] || mac80211_start_vif "$vif" "$ifname"
 525         done
 526
 527 }
 528
 529
 530 check_mac80211_device() {
 531         config_get phy "$1" phy
 532         [ -z "$phy" ] && {
 533                 find_mac80211_phy "$1" >/dev/null || return 0
 534                 config_get phy "$1" phy
 535         }
 536         [ "$phy" = "$dev" ] && found=1
 537 }
 538
 539 detect_mac80211() {
 540         devidx=0
 541         config_load wireless
 542         while :; do
 543                 config_get type "radio$devidx" type
 544                 [ -n "$type" ] || break
 545                 devidx=$(($devidx + 1))
 546         done
 547         for dev in $(ls /sys/class/ieee80211); do
 548                 found=0
 549                 config_foreach check_mac80211_device wifi-device
 550                 [ "$found" -gt 0 ] && continue
 551
 552                 mode_11n=""
 553                 mode_band="g"
 554                 channel="11"
 555                 ht_cap=0
 556                 for cap in $(iw phy "$dev" info | grep 'Capabilities:' | cut -d: -f2); do
 557                         ht_cap="$(($ht_cap | $cap))"
 558                 done
 559                 ht_capab="";
 560                 [ "$ht_cap" -gt 0 ] && {
 561                         mode_11n="n"
 562                         append ht_capab "       option htmode   HT20" "$N"
 563
 564                         list="  list ht_capab"
 565                         [ "$(($ht_cap & 1))" -eq 1 ] && append ht_capab "$list  LDPC" "$N"
 566                         [ "$(($ht_cap & 16))" -eq 16 ] && append ht_capab "$list        GF" "$N"
 567                         [ "$(($ht_cap & 32))" -eq 32 ] && append ht_capab "$list        SHORT-GI-20" "$N"
 568                         [ "$(($ht_cap & 64))" -eq 64 ] && append ht_capab "$list        SHORT-GI-40" "$N"
 569                         [ "$(($ht_cap & 128))" -eq 128 ] && append ht_capab "$list      TX-STBC" "$N"
 570                         [ "$(($ht_cap & 768))" -eq 256 ] && append ht_capab "$list      RX-STBC1" "$N"
 571                         [ "$(($ht_cap & 768))" -eq 512 ] && append ht_capab "$list      RX-STBC12" "$N"
 572                         [ "$(($ht_cap & 768))" -eq 768 ] && append ht_capab "$list      RX-STBC123" "$N"
 573                         [ "$(($ht_cap & 4096))" -eq 4096 ] && append ht_capab "$list    DSSS_CCK-40" "$N"
 574                 }
 575                 iw phy "$dev" info | grep -q '2412 MHz' || { mode_band="a"; channel="36"; }
 576
 577                 if [ -x /usr/bin/readlink ]; then
 578                         path="$(readlink -f /sys/class/ieee80211/${dev}/device)"
 579                         path="${path##/sys/devices/}"
 580                         dev_id="        option path     '$path'"
 581                 else
 582                         dev_id="        option macaddr  $(cat /sys/class/ieee80211/${dev}/macaddress)"
 583                 fi
 584
 585                 cat <<EOF
 586 config wifi-device  radio$devidx
 587         option type     mac80211
 588         option channel  ${channel}
 589         option hwmode   11${mode_11n}${mode_band}
 590 $dev_id
 591 $ht_capab
 592         # REMOVE THIS LINE TO ENABLE WIFI:
 593         option disabled 1
 594
 595 config wifi-iface
 596         option device   radio$devidx
 597         option network  lan
 598         option mode     ap
 599         option ssid     OpenWrt
 600         option encryption none
 601
 602 EOF
 603         devidx=$(($devidx + 1))
 604         done
 605 }
 606