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#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-2.0
# This test validates that netconsole is able to resume a target that was
# deactivated when its interface was removed when the interface is brought
# back up.
#
# The test configures a netconsole target and then removes netdevsim module to
# cause the interface to disappear. Targets are configured via cmdline to ensure
# targets bound by interface name and mac address can be resumed.
# The test verifies that the target moved to disabled state before adding
# netdevsim and the interface back.
#
# Finally, the test verifies that the target is re-enabled automatically and
# the message is received on the destination interface.
#
# Author: Andre Carvalho <asantostc@gmail.com>
set -euo pipefail
SCRIPTDIR=$(dirname "$(readlink -e "${BASH_SOURCE[0]}")")
source "${SCRIPTDIR}"/../lib/sh/lib_netcons.sh
SAVED_SRCMAC="" # to be populated later
SAVED_DSTMAC="" # to be populated later
modprobe netdevsim 2> /dev/null || true
rmmod netconsole 2> /dev/null || true
check_netconsole_module
function cleanup() {
cleanup_netcons "${NETCONS_CONFIGFS}/cmdline0"
do_cleanup
rmmod netconsole
}
function trigger_reactivation() {
# Add back low level module
modprobe netdevsim
# Recreate namespace and two interfaces
set_network
# Restore MACs
ip netns exec "${NAMESPACE}" ip link set "${DSTIF}" \
address "${SAVED_DSTMAC}"
if [ "${BINDMODE}" == "mac" ]; then
ip link set dev "${SRCIF}" down
ip link set dev "${SRCIF}" address "${SAVED_SRCMAC}"
# Rename device in order to trigger target resume, as initial
# when device was recreated it didn't have correct mac address.
ip link set dev "${SRCIF}" name "${TARGET}"
fi
}
function trigger_deactivation() {
# Start by storing mac addresses so we can be restored in reactivate
SAVED_DSTMAC=$(ip netns exec "${NAMESPACE}" \
cat /sys/class/net/"$DSTIF"/address)
SAVED_SRCMAC=$(mac_get "${SRCIF}")
# Remove low level module
rmmod netdevsim
}
trap cleanup EXIT
# Run the test twice, with different cmdline parameters
for BINDMODE in "ifname" "mac"
do
echo "Running with bind mode: ${BINDMODE}" >&2
# Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5)
echo "6 5" > /proc/sys/kernel/printk
# Create one namespace and two interfaces
set_network
# Create the command line for netconsole, with the configuration from
# the function above
CMDLINE=$(create_cmdline_str "${BINDMODE}")
# The content of kmsg will be save to the following file
OUTPUT_FILE="/tmp/${TARGET}-${BINDMODE}"
# Load the module, with the cmdline set
modprobe netconsole "${CMDLINE}"
# Expose cmdline target in configfs
mkdir "${NETCONS_CONFIGFS}/cmdline0"
# Target should be enabled
wait_target_state "cmdline0" "enabled"
# Trigger deactivation by unloading netdevsim module. Target should be
# disabled.
trigger_deactivation
wait_target_state "cmdline0" "disabled"
# Trigger reactivation by loading netdevsim, recreating the network and
# restoring mac addresses. Target should be re-enabled.
trigger_reactivation
wait_target_state "cmdline0" "enabled"
# Listen for netconsole port inside the namespace and destination
# interface
listen_port_and_save_to "${OUTPUT_FILE}" &
# Wait for socat to start and listen to the port.
wait_local_port_listen "${NAMESPACE}" "${PORT}" udp
# Send the message
echo "${MSG}: ${TARGET}" > /dev/kmsg
# Wait until socat saves the file to disk
busywait "${BUSYWAIT_TIMEOUT}" test -s "${OUTPUT_FILE}"
# Make sure the message was received in the dst part
# and exit
validate_msg "${OUTPUT_FILE}"
# kill socat in case it is still running
pkill_socat
# Cleanup & unload the module
cleanup
echo "${BINDMODE} : Test passed" >&2
done
trap - EXIT
exit "${EXIT_STATUS}"
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