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