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mac80211: detect existing interface before adding

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Keep existing wdev when creating new nl80211 interfaces if phy and
type match, delete it otherwise.
To make this work, also remove left-over debugging function which
prevented the return-value of the 'iw' command to be taken into
account in mac80211_iw_interface_add().
As 4addr-mode (WDS) was setup during interface creation for station
interfaces, also set it after interface creation to make sure an
existing sta interface ends up with the right mode.

Fixes: a5bc9787d4 ("mac80211: add support for dynamically
                    reconfiguring wifi")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2019-11-16 16:29:45 +01:00
parent 50d6e92619
commit ccf2aa9d4b
1 changed files with 35 additions and 4 deletions
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39
package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
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@ -15,10 +15,6 @@ MP_CONFIG_INT="mesh_retry_timeout mesh_confirm_timeout mesh_holding_timeout mesh
MP_CONFIG_BOOL="mesh_auto_open_plinks mesh_fwding"
MP_CONFIG_STRING="mesh_power_mode"
iw() {
command iw $@ || logger -t mac80211 "Failed command: iw $@"
}
NEWAPLIST=
OLDAPLIST=
NEWSPLIST=
@ -446,6 +442,36 @@ mac80211_iw_interface_add() {
rc="$?"
}
[ "$rc" = 233 ] && {
# Keep matching pre-existing interface
[ -d "/sys/class/ieee80211/${phy}/device/net/${ifname}" ] && \
case "$(iw dev wlan0 info | grep "^\ttype" | cut -d' ' -f2- 2>/dev/null)" in
"AP")
[ "$type" = "__ap" ] && rc=0
;;
"IBSS")
[ "$type" = "adhoc" ] && rc=0
;;
"managed")
[ "$type" = "managed" ] && rc=0
;;
"mesh point")
[ "$type" = "mp" ] && rc=0
;;
"monitor")
[ "$type" = "monitor" ] && rc=0
;;
esac
}
[ "$rc" = 233 ] && {
iw dev "$ifname" del
sleep 1
iw phy "$phy" interface add "$ifname" type "$type" $wdsflag
rc="$?"
}
[ "$rc" = 233 ] && {
# Device might not support virtual interfaces, so the interface never got deleted in the first place.
# Check if the interface already exists, and avoid failing in this case.
@ -511,6 +537,11 @@ mac80211_prepare_vif() {
[ "$enable" = 0 ] || staidx="$(($staidx + 1))"
[ "$wds" -gt 0 ] && wdsflag="4addr on"
mac80211_iw_interface_add "$phy" "$ifname" managed "$wdsflag" || return
if [ "$wds" -gt 0 ]; then
iw "$ifname" set 4addr on
else
iw "$ifname" set 4addr off
fi
[ "$powersave" -gt 0 ] && powersave="on" || powersave="off"
iw "$ifname" set power_save "$powersave"
;;