hostapd: Add support for card specific hacks

Hacky way to allow to override any settings for individual cards. This
makes it possible to fix configuration of cards that wrongly report
their capabilities.

Proper way is to somehow integrate it upfront, override reading of
possible capabilities and disable the options in all UIs and properly
report options that are not supported.

That would be quite some complex work and would take quite some time.
But this solution is simple enough and allows us to correct wrong
settings and make problematic cards work again.

patches/openwrt/hack/0023-hostapd-Add-support-for-card-specific-hacks.patch

+From 718197001148a24ecf15ef807263c708854581bf Mon Sep 17 00:00:00 2001
+From: Michal Hrusecky <michal.hrusecky@turris.com>
+Date: Wed, 28 Dec 2022 22:59:30 +0100
+Subject: [PATCH] hostapd: Add support for card specific hacks
+
+Hacky way to allow to override any settings for individual cards. This
+makes it possible to fix configuration of cards that wrongly report
+their capabilities.
+
+Proper way is to somehow integrate it upfront, override reading of
+possible capabilities and disable the options in all UIs and properly
+report options that are not supported.
+
+That would be quite some complex work and would take quite some time.
+But this solution is simple enough and allows us to correct wrong
+settings and make problematic cards work again.
+---
+ package/network/services/hostapd/files/hostapd.sh | 10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+diff --git a/package/network/services/hostapd/files/hostapd.sh b/package/network/services/hostapd/files/hostapd.sh
+index 3c08d55c5d..284ce50812 100644
+--- a/package/network/services/hostapd/files/hostapd.sh
++++ b/package/network/services/hostapd/files/hostapd.sh
+@@ -129,6 +129,11 @@ hostapd_prepare_device_config() {
+ 	set_default airtime_mode 0
+ 	set_default cell_density 0
+ 
++	local card_id="$(cat /sys/class/ieee80211/${phy}/device/vendor)-$(cat /sys/class/ieee80211/${phy}/device/device)"
++	if [ -r /lib/netifd/wireless/hacks/${card_id}-device ]; then
++		. /lib/netifd/wireless/hacks/${card_id}-device
++	fi
++
+ 	[ -n "$country" ] && {
+ 		append base_cfg "country_code=$country" "$N"
+ 		[ -n "$country3" ] && append base_cfg "country3=$country3" "$N"
+@@ -546,6 +551,11 @@ hostapd_set_bss_options() {
+ 	set_default airtime_bss_limit 0
+ 	set_default eap_server 0
+ 
++	local card_id="$(cat /sys/class/ieee80211/${phy}/device/vendor)-$(cat /sys/class/ieee80211/${phy}/device/device)"
++	if [ -r /lib/netifd/wireless/hacks/${card_id}-bss ]; then
++		. /lib/netifd/wireless/hacks/${card_id}-bss
++	fi
++
+ 	append bss_conf "ctrl_interface=/var/run/hostapd"
+ 	if [ "$isolate" -gt 0 ]; then
+ 		append bss_conf "ap_isolate=$isolate" "$N"
+-- 
+2.39.0
+