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113 lines
3.0 KiB
113 lines
3.0 KiB
2 months ago
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#!/bin/sh
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PATH=/sbin:/bin:/usr/sbin:/usr/bin
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TARGET_ETH0_NODE="ethernet@fe010000"
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TARGET_ETH1_NODE="ethernet@fe2a0000"
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TEMP_NAME="tera-swap0"
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log_message() {
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echo "tera-ethernet-map: $*"
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}
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node_for_interface() {
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node_path=$(readlink -f "/sys/class/net/$1/device/of_node" 2>/dev/null) || return 1
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echo "${node_path##*/}"
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}
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wait_for_interfaces() {
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attempt=0
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while [ "$attempt" -lt 5 ]; do
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if [ -e /sys/class/net/eth0 ] && [ -e /sys/class/net/eth1 ]; then
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return 0
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fi
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attempt=$((attempt + 1))
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sleep 1
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done
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return 1
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}
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start_mapping() {
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if ! wait_for_interfaces; then
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log_message "eth0/eth1 did not appear"
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return 1
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fi
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eth0_node=$(node_for_interface eth0) || {
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log_message "cannot resolve eth0 device-tree node"
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return 1
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}
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eth1_node=$(node_for_interface eth1) || {
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log_message "cannot resolve eth1 device-tree node"
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return 1
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}
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if [ "$eth0_node" = "$TARGET_ETH0_NODE" ] && \
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[ "$eth1_node" = "$TARGET_ETH1_NODE" ]; then
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log_message "target mapping is already active"
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return 0
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fi
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if [ "$eth0_node" != "$TARGET_ETH1_NODE" ] || \
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[ "$eth1_node" != "$TARGET_ETH0_NODE" ]; then
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log_message "unexpected mapping: eth0=$eth0_node eth1=$eth1_node"
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return 1
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fi
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if ip link show dev "$TEMP_NAME" >/dev/null 2>&1; then
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log_message "temporary interface $TEMP_NAME already exists"
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return 1
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fi
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ip link set dev eth0 down || return 1
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ip link set dev eth1 down || return 1
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ip link set dev eth0 name "$TEMP_NAME" || return 1
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if ! ip link set dev eth1 name eth0; then
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ip link set dev "$TEMP_NAME" name eth0 >/dev/null 2>&1
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log_message "failed to rename original eth1 to eth0; rolled back"
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return 1
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fi
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if ! ip link set dev "$TEMP_NAME" name eth1; then
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ip link set dev eth0 name eth1 >/dev/null 2>&1
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ip link set dev "$TEMP_NAME" name eth0 >/dev/null 2>&1
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log_message "failed to finish interface swap; rolled back"
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return 1
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fi
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eth0_node=$(node_for_interface eth0)
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eth1_node=$(node_for_interface eth1)
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if [ "$eth0_node" != "$TARGET_ETH0_NODE" ] || \
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[ "$eth1_node" != "$TARGET_ETH1_NODE" ]; then
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log_message "post-swap verification failed: eth0=$eth0_node eth1=$eth1_node"
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return 1
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fi
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log_message "mapping applied: eth0=$eth0_node eth1=$eth1_node"
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return 0
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}
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case "${1:-start}" in
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start|restart)
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start_mapping
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;;
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stop)
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;;
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status)
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eth0_node=$(node_for_interface eth0 2>/dev/null || echo missing)
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eth1_node=$(node_for_interface eth1 2>/dev/null || echo missing)
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echo "eth0=$eth0_node"
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echo "eth1=$eth1_node"
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if [ "$eth0_node" = "$TARGET_ETH0_NODE" ] && \
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[ "$eth1_node" = "$TARGET_ETH1_NODE" ]; then
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exit 0
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fi
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exit 1
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;;
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*)
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echo "Usage: $0 {start|stop|restart|status}" >&2
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exit 2
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;;
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esac
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