bsbf-usb-netdev-autodhcp: add

bsbf-usb-netdev-autodhcp creates a network with a DHCP client using a newly
created network interface. It uses metric values from 1 to 8.

Signed-off-by: Chester A. Unal <redacted>

diff --git a/net/bsbf-usb-netdev-autodhcp/Makefile b/net/bsbf-usb-netdev-autodhcp/Makefile
new file mode 100644 (file)
index 0000000..46c7e8c
--- /dev/null
+++ b/net/bsbf-usb-netdev-autodhcp/Makefile
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# Copyright (C) 2025-2026 Chester A. Unal <chester.a.unal@arinc9.com>
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=bsbf-usb-netdev-autodhcp
+PKG_VERSION:=1
+
+PKG_LICENSE:=AGPL-3.0-or-later
+PKG_MAINTAINER:=Chester A. Unal <chester.a.unal@arinc9.com>
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/bsbf-usb-netdev-autodhcp
+  SECTION:=net
+  CATEGORY:=Network
+  TITLE:=bsbf-usb-netdev-autodhcp
+endef
+
+define Package/bsbf-usb-netdev-autodhcp/description
+  bsbf-usb-netdev-autodhcp creates a network with a DHCP client using a newly
+  created network interface. It uses metric values from 1 to 8.
+endef
+
+define Build/Compile
+endef
+
+define Package/bsbf-usb-netdev-autodhcp/install
+       $(INSTALL_DIR) $(1)/etc/hotplug.d/net
+       $(INSTALL_BIN) ./files/etc/hotplug.d/net/99-bsbf-usb-netdev-autodhcp $(1)/etc/hotplug.d/net
+endef
+
+$(eval $(call BuildPackage,bsbf-usb-netdev-autodhcp))

diff --git a/net/bsbf-usb-netdev-autodhcp/files/etc/hotplug.d/net/99-bsbf-usb-netdev-autodhcp b/net/bsbf-usb-netdev-autodhcp/files/etc/hotplug.d/net/99-bsbf-usb-netdev-autodhcp
new file mode 100644 (file)
index 0000000..6cf87e3
--- /dev/null
+++ b/net/bsbf-usb-netdev-autodhcp/files/etc/hotplug.d/net/99-bsbf-usb-netdev-autodhcp
@@ -0,0 +1,35 @@
+#!/bin/sh
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# Copyright (C) 2025-2026 Chester A. Unal <chester.a.unal@arinc9.com>
+
+# Only run if a network interface from a USB device is being added.
+[ "$ACTION" = "add" ] && echo "$DEVPATH" | grep -q usb || exit
+
+# Exclude wwan and qmimux network interfaces which a DHCP client wouldn't work
+# on.
+case "$DEVICENAME" in
+       wwan*|qmimux*) exit ;;
+esac
+
+# Decide on the metric value. Start from 1 and work up to 8.
+metric=1
+while [ $metric -le 8 ]; do
+       # Break if this metric isn't in use.
+       uci show network | grep -q ".metric='$metric'" || break
+
+       # Exit if this metric is in use for the same network interface.
+       [ "$(uci get network.wan_"$DEVICENAME".metric)" = "$metric" ] && exit
+
+       # Add 1 to metric if another network uses this metric.
+       metric=$((metric + 1))
+done
+# If there are no available metrics, exit with code 1.
+[ "$metric" -gt 8 ] && exit 1
+
+uci set network.wan_"$DEVICENAME"=interface
+uci set network.wan_"$DEVICENAME".device="$DEVICENAME"
+uci set network.wan_"$DEVICENAME".proto='dhcp'
+uci set network.wan_"$DEVICENAME".peerdns='0'
+uci set network.wan_"$DEVICENAME".metric="$metric"
+uci commit network
+ifup wan_"$DEVICENAME"