From 67bfedfe52ed2063ba3f0bff1cb71b1e807f4b89 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 21 Feb 2022 18:25:18 +0100
Subject: [dhcp-busybox] Add service to create additional bridges

---
 .../systemd/system/bridge-additional-nics.service  | 10 +++++
 .../bridge-additional-nics.service                 |  1 +
 .../openslx/scripts/systemd-bridge_additional_nics | 50 ++++++++++++++++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 core/modules/dhcpc-busybox/data/etc/systemd/system/bridge-additional-nics.service
 create mode 120000 core/modules/dhcpc-busybox/data/etc/systemd/system/network.target.wants/bridge-additional-nics.service
 create mode 100755 core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-bridge_additional_nics

(limited to 'core/modules/dhcpc-busybox/data')

diff --git a/core/modules/dhcpc-busybox/data/etc/systemd/system/bridge-additional-nics.service b/core/modules/dhcpc-busybox/data/etc/systemd/system/bridge-additional-nics.service
new file mode 100644
index 00000000..df36e015
--- /dev/null
+++ b/core/modules/dhcpc-busybox/data/etc/systemd/system/bridge-additional-nics.service
@@ -0,0 +1,10 @@
+[Unit]
+Description=Setup bridges for addition network interfaces
+Wants=systemd-udevd.service
+After=systemd-udev-settle.service systemd-udevd.service
+Before=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/opt/openslx/scripts/systemd-bridge_additional_nics
+RemainAfterExit=true
diff --git a/core/modules/dhcpc-busybox/data/etc/systemd/system/network.target.wants/bridge-additional-nics.service b/core/modules/dhcpc-busybox/data/etc/systemd/system/network.target.wants/bridge-additional-nics.service
new file mode 120000
index 00000000..948dc5d7
--- /dev/null
+++ b/core/modules/dhcpc-busybox/data/etc/systemd/system/network.target.wants/bridge-additional-nics.service
@@ -0,0 +1 @@
+../bridge-additional-nics.service
\ No newline at end of file
diff --git a/core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-bridge_additional_nics b/core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-bridge_additional_nics
new file mode 100755
index 00000000..295483f9
--- /dev/null
+++ b/core/modules/dhcpc-busybox/data/opt/openslx/scripts/systemd-bridge_additional_nics
@@ -0,0 +1,50 @@
+#!/bin/bash
+#
+# Small script scanning sysfs for physical network interfaces
+# and creating additional network bridges 'br-nic-[0-9]'.
+
+. /opt/openslx/config
+
+# do nothing if not netbooted
+[ -z "$SLX_PXE_NETIF" ] && exit 0
+# or feature disabled
+[ "$SLX_BRIDGE_OTHER_NICS" != "yes" ] && exit 0
+
+declare -g id=1
+for nic in /sys/class/net/*; do
+	# The presence of this symlink pointing to the physical device
+	# seems to be the better way to detect them.
+	[ -h "${nic}/device" ] || continue
+
+	# do not handle the primary interface
+	[ "$SLX_PXE_NETIF" = "${nic##*/}" ] && continue
+
+	# physical nic found, create a bridge with the same MAC
+	bridge="br-nic-${id}"
+	mac="$(cat "${nic}/address")"
+	if ! [[ $mac =~ ^([0-9a-f]{2}:){5}[0-9a-f]{2}$ ]]; then
+		echo "'$mac' does not seem like a valid MAC address."
+		continue
+	fi
+
+	(
+	set -e
+	brctl addbr "$bridge"
+	brctl stp "$bridge" 0
+	ip link set addr "$mac" "$bridge"
+	ip link set dev "${nic##*/}" up
+	brctl addif "$bridge" "${nic##*/}"
+	ip link set dev "$bridge" up
+	)
+	ret=$?
+	if [ "$ret" != 0 ]; then
+		echo "Failed to setup additional bridge '$bridge' for '$nic'."
+		brctl delbr "$bridge"
+		continue
+	fi
+
+	# all fine, increase counter and continue
+	(( id++ ))
+done
+
+exit 0
-- 
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