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openwrt/package/mac80211/files/lib/wifi/mac80211.sh
Felix Fietkau 3494bdc59a mac80211: allow AP configuration of beacon interval, DTIM period, maximum permissible STA listen interval, and basic rates 
This introduces beacon_int and basic_rate (per wifi-device), and
dtim_period and max_listen_int (per wifi-iface) for mac80211. These
configure the beacon interval, basic rate specification, DTIM period
(one DTIM per this many beacon frames), and maximum listen interval
that a STA will be permitted to associate with. All of the new
settings are optional; if they're absent, the existing hostapd (or, in
the case of basic_rate, driver) defaults will be used.

The existing bintval property only used for type adhoc is moved from
wifi-iface to wifi-device, and is renamed to beacon_interval because
bintval isn't a great name. The beacon interval is property of the
wifi-device; while the choice between wifi-device and wifi-iface may
not be relevant with an adhoc network, there's no reason to configure
the same property one way for type adhoc and another for type ap. This
change isn't expected to cause many problems, as bintval was added
recently, in r25111.

Similarly, the list of basic rates, also added for type adhoc in
r25111, is a property of the device and not the interface. Further, it
ought to be represented in UCI as a list, not a string dependent on
the format that iw uses. I’ve moved it onto the device, renamed it to
basic_rate, and made it configurable for APs via hostapd. Finally, I
adapted it to use the same kb/s representation as mcast_rate; there's
precedent for this format in that it's also how madwifi interprets
mcast_rate.

Neither bintval nor basicrates were ever documented in the UCI
wireless configuration page on the wiki. When this change is
committed, I'll update the documentation as needed.

Signed-off-by: Mark Mentovai <mark@moxienet.com>

SVN-Revision: 25837
2011-03-02 21:08:28 +00:00

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#!/bin/sh
append DRIVERS "mac80211"
mac80211_hostapd_setup_base() {
local phy="$1"
local ifname="$2"
cfgfile="/var/run/hostapd-$phy.conf"
macfile="/var/run/hostapd-$phy.maclist"
[ -e "$macfile" ] && rm -f "$macfile"
config_get device "$vif" device
config_get country "$device" country
config_get hwmode "$device" hwmode
config_get channel "$device" channel
config_get beacon_int "$device" beacon_int
config_get basic_rate_list "$device" basic_rate
config_get_bool noscan "$device" noscan
[ -n "$channel" -a -z "$hwmode" ] && wifi_fixup_hwmode "$device"
[ "$channel" = auto ] && channel=
[ -n "$hwmode" ] && {
config_get hwmode_11n "$device" hwmode_11n
[ -n "$hwmode_11n" ] && {
hwmode="$hwmode_11n"
append base_cfg "ieee80211n=1" "$N"
config_get htmode "$device" htmode
config_get ht_capab_list "$device" ht_capab
case "$htmode" in
HT20|HT40+|HT40-) ht_capab="[$htmode]";;
*)ht_capab=;;
esac
for cap in $ht_capab_list; do
ht_capab="$ht_capab[$cap]"
done
[ -n "$ht_capab" ] && append base_cfg "ht_capab=$ht_capab" "$N"
}
}
config_get macfilter "$vif" macfilter
case "$macfilter" in
allow)
append base_cfg "macaddr_acl=1" "$N"
append base_cfg "accept_mac_file=$macfile" "$N"
;;
deny)
append base_cfg "macaddr_acl=0" "$N"
append base_cfg "deny_mac_file=$macfile" "$N"
;;
esac
config_get maclist "$vif" maclist
[ -n "$maclist" ] && {
for mac in $maclist; do
echo "$mac" >> $macfile
done
}
local br brval brstr
[ -n "$basic_rate_list" ] && {
for br in $basic_rate_list; do
brval="$(($br / 100))"
[ -n "$brstr" ] && brstr="$brstr "
brstr="$brstr$brval"
done
}
cat >> "$cfgfile" <<EOF
ctrl_interface=/var/run/hostapd-$phy
driver=nl80211
wmm_ac_bk_cwmin=4
wmm_ac_bk_cwmax=10
wmm_ac_bk_aifs=7
wmm_ac_bk_txop_limit=0
wmm_ac_bk_acm=0
wmm_ac_be_aifs=3
wmm_ac_be_cwmin=4
wmm_ac_be_cwmax=10
wmm_ac_be_txop_limit=0
wmm_ac_be_acm=0
wmm_ac_vi_aifs=2
wmm_ac_vi_cwmin=3
wmm_ac_vi_cwmax=4
wmm_ac_vi_txop_limit=94
wmm_ac_vi_acm=0
wmm_ac_vo_aifs=2
wmm_ac_vo_cwmin=2
wmm_ac_vo_cwmax=3
wmm_ac_vo_txop_limit=47
wmm_ac_vo_acm=0
tx_queue_data3_aifs=7
tx_queue_data3_cwmin=15
tx_queue_data3_cwmax=1023
tx_queue_data3_burst=0
tx_queue_data2_aifs=3
tx_queue_data2_cwmin=15
tx_queue_data2_cwmax=63
tx_queue_data2_burst=0
tx_queue_data1_aifs=1
tx_queue_data1_cwmin=7
tx_queue_data1_cwmax=15
tx_queue_data1_burst=3.0
tx_queue_data0_aifs=1
tx_queue_data0_cwmin=3
tx_queue_data0_cwmax=7
tx_queue_data0_burst=1.5
${hwmode:+hw_mode=$hwmode}
${channel:+channel=$channel}
${beacon_int:+beacon_int=$beacon_int}
${country:+country_code=$country}
${noscan:+noscan=$noscan}
${brstr:+basic_rates=$brstr}
$base_cfg
EOF
}
mac80211_hostapd_setup_bss() {
local phy="$1"
local vif="$2"
hostapd_cfg=
cfgfile="/var/run/hostapd-$phy.conf"
config_get ifname "$vif" ifname
if [ -f "$cfgfile" ]; then
append hostapd_cfg "bss=$ifname" "$N"
else
mac80211_hostapd_setup_base "$phy" "$ifname"
append hostapd_cfg "interface=$ifname" "$N"
fi
local net_cfg bridge
net_cfg="$(find_net_config "$vif")"
[ -z "$net_cfg" ] || bridge="$(bridge_interface "$net_cfg")"
config_set "$vif" bridge "$bridge"
hostapd_set_bss_options hostapd_cfg "$vif"
config_get_bool wds "$vif" wds 0
[ "$wds" -gt 0 ] && append hostapd_cfg "wds_sta=1" "$N"
local macaddr hidden maxassoc wmm
config_get macaddr "$vif" macaddr
config_get maxassoc "$vif" maxassoc
config_get dtim_period "$vif" dtim_period
config_get max_listen_int "$vif" max_listen_int
config_get_bool hidden "$vif" hidden 0
config_get_bool wmm "$vif" wmm 1
cat >> /var/run/hostapd-$phy.conf <<EOF
$hostapd_cfg
wmm_enabled=$wmm
bssid=$macaddr
ignore_broadcast_ssid=$hidden
${dtim_period:+dtim_period=$dtim_period}
${max_listen_int:+max_listen_interval=$max_listen_int}
${maxassoc:+max_num_sta=$maxassoc}
EOF
}
mac80211_start_vif() {
local vif="$1"
local ifname="$2"
local net_cfg
net_cfg="$(find_net_config "$vif")"
[ -z "$net_cfg" ] || start_net "$ifname" "$net_cfg"
set_wifi_up "$vif" "$ifname"
}
find_mac80211_phy() {
local device="$1"
local macaddr="$(config_get "$device" macaddr | tr 'A-Z' 'a-z')"
config_get phy "$device" phy
[ -z "$phy" -a -n "$macaddr" ] && {
for phy in $(ls /sys/class/ieee80211 2>/dev/null); do
[ "$macaddr" = "$(cat /sys/class/ieee80211/${phy}/macaddress)" ] || continue
config_set "$device" phy "$phy"
break
done
config_get phy "$device" phy
}
[ -n "$phy" -a -d "/sys/class/ieee80211/$phy" ] || {
echo "PHY for wifi device $1 not found"
return 1
}
[ -z "$macaddr" ] && {
config_set "$device" macaddr "$(cat /sys/class/ieee80211/${phy}/macaddress)"
}
return 0
}
scan_mac80211() {
local device="$1"
local adhoc sta ap monitor mesh
config_get vifs "$device" vifs
for vif in $vifs; do
config_get mode "$vif" mode
case "$mode" in
adhoc|sta|ap|monitor|mesh)
append $mode "$vif"
;;
*) echo "$device($vif): Invalid mode, ignored."; continue;;
esac
done
config_set "$device" vifs "${ap:+$ap }${adhoc:+$adhoc }${sta:+$sta }${monitor:+$monitor }${mesh:+$mesh}"
}
list_phy_interfaces() {
local phy="$1"
if [ -d "/sys/class/ieee80211/${phy}/device/net" ]; then
ls "/sys/class/ieee80211/${phy}/device/net" 2>/dev/null;
else
ls "/sys/class/ieee80211/${phy}/device" 2>/dev/null | grep net: | sed -e 's,net:,,g'
fi
}
disable_mac80211() (
local device="$1"
find_mac80211_phy "$device" || return 0
config_get phy "$device" phy
set_wifi_down "$device"
# kill all running hostapd and wpa_supplicant processes that
# are running on atheros/mac80211 vifs
for pid in `pidof hostapd`; do
grep -E "$phy" /proc/$pid/cmdline >/dev/null && \
kill $pid
done
include /lib/network
for wdev in $(list_phy_interfaces "$phy"); do
[ -f "/var/run/$wdev.pid" ] && kill $(cat /var/run/$wdev.pid) >&/dev/null 2>&1
for pid in `pidof wpa_supplicant`; do
grep "$wdev" /proc/$pid/cmdline >/dev/null && \
kill $pid
done
ifconfig "$wdev" down 2>/dev/null
unbridge "$dev"
iw dev "$wdev" del
done
return 0
)
get_freq() {
local phy="$1"
local chan="$2"
iw "$phy" info | grep -E -m1 "(\* ${chan:-....} MHz${chan:+|\\[$chan\\]})" | grep MHz | awk '{print $2}'
}
enable_mac80211() {
local device="$1"
config_get channel "$device" channel
config_get vifs "$device" vifs
config_get txpower "$device" txpower
config_get country "$device" country
config_get distance "$device" distance
config_get txantenna "$device" txantenna all
config_get rxantenna "$device" rxantenna all
config_get frag "$device" frag
config_get rts "$device" rts
find_mac80211_phy "$device" || return 0
config_get phy "$device" phy
local i=0
local macidx=0
local apidx=0
fixed=""
local hostapd_ctrl=""
[ -n "$country" ] && iw reg set "$country"
[ "$channel" = "auto" -o "$channel" = "0" ] || {
fixed=1
}
iw phy "$phy" set antenna $txantenna $rxantenna >/dev/null 2>&1
[ -n "$distance" ] && iw phy "$phy" set distance "$distance"
[ -n "$frag" ] && iw phy "$phy" set frag "${frag%%.*}"
[ -n "$rts" ] && iw phy "$phy" set rts "${rts%%.*}"
export channel fixed
# convert channel to frequency
local freq="$(get_freq "$phy" "${fixed:+$channel}")"
wifi_fixup_hwmode "$device" "g"
for vif in $vifs; do
while [ -d "/sys/class/net/wlan$i" ]; do
i=$(($i + 1))
done
config_get ifname "$vif" ifname
[ -n "$ifname" ] || {
ifname="wlan$i"
}
config_set "$vif" ifname "$ifname"
config_get mode "$vif" mode
config_get ssid "$vif" ssid
# It is far easier to delete and create the desired interface
case "$mode" in
adhoc)
iw phy "$phy" interface add "$ifname" type adhoc
;;
ap)
# Hostapd will handle recreating the interface and
# it's accompanying monitor
apidx="$(($apidx + 1))"
i=$(($i + 1))
[ "$apidx" -gt 1 ] || iw phy "$phy" interface add "$ifname" type managed
;;
mesh)
config_get mesh_id "$vif" mesh_id
iw phy "$phy" interface add "$ifname" type mp mesh_id "$mesh_id"
;;
monitor)
iw phy "$phy" interface add "$ifname" type monitor
;;
sta)
local wdsflag
config_get_bool wds "$vif" wds 0
[ "$wds" -gt 0 ] && wdsflag="4addr on"
iw phy "$phy" interface add "$ifname" type managed $wdsflag
config_get_bool powersave "$vif" powersave 0
[ "$powersave" -gt 0 ] && powersave="on" || powersave="off"
iwconfig "$ifname" power "$powersave"
;;
esac
# All interfaces must have unique mac addresses
# which can either be explicitly set in the device
# section, or automatically generated
config_get macaddr "$device" macaddr
local mac_1="${macaddr%%:*}"
local mac_2="${macaddr#*:}"
config_get vif_mac "$vif" macaddr
[ -n "$vif_mac" ] || {
if [ "$macidx" -gt 0 ]; then
offset="$(( 2 + $macidx * 4 ))"
else
offset="0"
fi
vif_mac="$( printf %02x $((0x$mac_1 + $offset)) ):$mac_2"
macidx="$(($macidx + 1))"
}
[ "$mode" = "ap" ] || ifconfig "$ifname" hw ether "$vif_mac"
config_set "$vif" macaddr "$vif_mac"
# !! ap !!
#
# ALL ap functionality will be passed to hostapd
#
# !! station !!
#
# ALL station functionality will be passed to wpa_supplicant
#
if [ ! "$mode" = "ap" ]; then
# We attempt to set the channel for all interfaces, although
# mac80211 may not support it or the driver might not yet
# for ap mode this is handled by hostapd
[ -n "$fixed" -a -n "$channel" ] && iw dev "$ifname" set channel "$channel"
fi
config_get vif_txpower "$vif" txpower
# use vif_txpower (from wifi-iface) to override txpower (from
# wifi-device) if the latter doesn't exist
txpower="${txpower:-$vif_txpower}"
[ -z "$txpower" ] || iw dev "$ifname" set txpower fixed "${txpower%%.*}00"
done
local start_hostapd=
rm -f /var/run/hostapd-$phy.conf
for vif in $vifs; do
config_get mode "$vif" mode
[ "$mode" = "ap" ] || continue
mac80211_hostapd_setup_bss "$phy" "$vif"
start_hostapd=1
done
[ -n "$start_hostapd" ] && {
hostapd -P /var/run/wifi-$phy.pid -B /var/run/hostapd-$phy.conf || {
echo "Failed to start hostapd for $phy"
return
}
sleep 2
for vif in $vifs; do
config_get mode "$vif" mode
config_get ifname "$vif" ifname
[ "$mode" = "ap" ] || continue
hostapd_ctrl="${hostapd_ctrl:-/var/run/hostapd-$phy/$ifname}"
mac80211_start_vif "$vif" "$ifname"
done
}
for vif in $vifs; do
config_get mode "$vif" mode
config_get ifname "$vif" ifname
[ ! "$mode" = "ap" ] || continue
ifconfig "$ifname" up
if [ ! "$mode" = "ap" ]; then
ifconfig "$ifname" up
case "$mode" in
adhoc)
config_get bssid "$vif" bssid
config_get ssid "$vif" ssid
config_get beacon_int "$device" beacon_int
config_get basic_rate_list "$device" basic_rate
config_get encryption "$vif" encryption
config_get key "$vif" key 1
config_get mcast_rate "$vif" mcast_rate
local keyspec=""
[ "$encryption" == "wep" ] && {
case "$key" in
[1234])
local idx
for idx in 1 2 3 4; do
local ikey
config_get ikey "$vif" "key$idx"
[ -n "$ikey" ] && {
ikey="$(($idx - 1)):$(prepare_key_wep "$ikey")"
[ $idx -eq $key ] && ikey="d:$ikey"
append keyspec "$ikey"
}
done
;;
*) append keyspec "d:0:$(prepare_key_wep "$key")" ;;
esac
}
local br brval brsub brstr
[ -n "$basic_rate_list" ] && {
for br in $basic_rate_list; do
brval="$(($br / 1000))"
brsub="$((($br / 100) % 10))"
[ "$brsub" -gt 0 ] && brval="$brval.$brsub"
[ -n "$brstr" ] && brstr="$brstr,"
brstr="$brstr$brval"
done
}
local mcval=""
[ -n "$mcast_rate" ] && {
mcval="$(($mcast_rate / 1000))"
mcsub="$(( ($mcast_rate / 100) % 10 ))"
[ "$mcsub" -gt 0 ] && mcval="$mcval.$mcsub"
}
iw dev "$ifname" ibss join "$ssid" $freq \
${fixed:+fixed-freq} $bssid \
${beacon_int:+beacon-interval $beacon_int} \
${brstr:+basic-rates $brstr} \
${mcval:+mcast-rate $mcval} \
${keyspec:+keys $keyspec}
;;
sta)
if eval "type wpa_supplicant_setup_vif" 2>/dev/null >/dev/null; then
wpa_supplicant_setup_vif "$vif" nl80211 "${hostapd_ctrl:+-H $hostapd_ctrl}" || {
echo "enable_mac80211($device): Failed to set up wpa_supplicant for interface $ifname" >&2
# make sure this wifi interface won't accidentally stay open without encryption
ifconfig "$ifname" down
continue
}
fi
;;
esac
mac80211_start_vif "$vif" "$ifname"
fi
done
}
check_device() {
config_get phy "$1" phy
[ -z "$phy" ] && {
find_mac80211_phy "$1" >/dev/null || return 0
config_get phy "$1" phy
}
[ "$phy" = "$dev" ] && found=1
}
detect_mac80211() {
devidx=0
config_load wireless
while :; do
config_get type "radio$devidx" type
[ -n "$type" ] || break
devidx=$(($devidx + 1))
done
for dev in $(ls /sys/class/ieee80211); do
found=0
config_foreach check_device wifi-device
[ "$found" -gt 0 ] && continue
mode_11n=""
mode_band="g"
channel="11"
ht_cap=0
for cap in $(iw phy "$dev" info | grep 'Capabilities:' | cut -d: -f2); do
ht_cap="$(($ht_cap | $cap))"
done
ht_capab="";
[ "$ht_cap" -gt 0 ] && {
mode_11n="n"
append ht_capab " option htmode HT20" "$N"
list=" list ht_capab"
[ "$(($ht_cap & 1))" -eq 1 ] && append ht_capab "$list LDPC" "$N"
[ "$(($ht_cap & 16))" -eq 16 ] && append ht_capab "$list GF" "$N"
[ "$(($ht_cap & 32))" -eq 32 ] && append ht_capab "$list SHORT-GI-20" "$N"
[ "$(($ht_cap & 64))" -eq 64 ] && append ht_capab "$list SHORT-GI-40" "$N"
[ "$(($ht_cap & 128))" -eq 128 ] && append ht_capab "$list TX-STBC" "$N"
[ "$(($ht_cap & 768))" -eq 256 ] && append ht_capab "$list RX-STBC1" "$N"
[ "$(($ht_cap & 768))" -eq 512 ] && append ht_capab "$list RX-STBC12" "$N"
[ "$(($ht_cap & 768))" -eq 768 ] && append ht_capab "$list RX-STBC123" "$N"
[ "$(($ht_cap & 4096))" -eq 4096 ] && append ht_capab "$list DSSS_CCK-40" "$N"
}
iw phy "$dev" info | grep -q '2412 MHz' || { mode_band="a"; channel="36"; }
cat <<EOF
config wifi-device radio$devidx
option type mac80211
option channel ${channel}
option macaddr $(cat /sys/class/ieee80211/${dev}/macaddress)
option hwmode 11${mode_11n}${mode_band}
$ht_capab
# REMOVE THIS LINE TO ENABLE WIFI:
option disabled 1
config wifi-iface
option device radio$devidx
option network lan
option mode ap
option ssid OpenWrt
option encryption none
EOF
devidx=$(($devidx + 1))
done
}
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