selftest: netcons: create a torture test

	netcons_fragmented_msg.sh \

	netcons_overflow.sh \

	netcons_sysdata.sh \

	netcons_torture.sh \

	netpoll_basic.py \

	ping.py \

	psp.py \

#!/usr/bin/env bash

# SPDX-License-Identifier: GPL-2.0

# Repeatedly send kernel messages, toggles netconsole targets on and off,

# creates and deletes targets in parallel, and toggles the source interface to

# simulate stress conditions.

#

# This test aims to verify the robustness of netconsole under dynamic

# configurations and concurrent operations.

#

# The major goal is to run this test with LOCKDEP, Kmemleak and KASAN to make

# sure no issues is reported.

#

# Author: Breno Leitao <leitao@debian.org>

set -euo pipefail

SCRIPTDIR=$(dirname "$(readlink -e "${BASH_SOURCE[0]}")")

source "${SCRIPTDIR}"/lib/sh/lib_netcons.sh

# Number of times the main loop run

ITERATIONS=${1:-150}

# Only test extended format

FORMAT="extended"

# And ipv6 only

IP_VERSION="ipv6"

# Create, enable and delete some targets.

create_and_delete_random_target() {

	COUNT=2

	RND_PREFIX=$(mktemp -u netcons_rnd_XXXX_)

	if [ -d "${NETCONS_CONFIGFS}/${RND_PREFIX}${COUNT}"  ] || \

	   [ -d "${NETCONS_CONFIGFS}/${RND_PREFIX}0" ]; then

		echo "Function didn't finish yet, skipping it." >&2

		return

	fi

	# enable COUNT targets

	for i in $(seq ${COUNT})

	do

		RND_TARGET="${RND_PREFIX}"${i}

		RND_TARGET_PATH="${NETCONS_CONFIGFS}"/"${RND_TARGET}"

		# Basic population so the target can come up

		_create_dynamic_target "${FORMAT}" "${RND_TARGET_PATH}"

	done

	echo "netconsole selftest: ${COUNT} additional targets were created" > /dev/kmsg

	# disable them all

	for i in $(seq ${COUNT})

	do

		RND_TARGET="${RND_PREFIX}"${i}

		RND_TARGET_PATH="${NETCONS_CONFIGFS}"/"${RND_TARGET}"

		if [[ $(cat "${RND_TARGET_PATH}/enabled") -eq 1 ]]

		then

			echo 0 > "${RND_TARGET_PATH}"/enabled

		fi

		rmdir "${RND_TARGET_PATH}"

	done

}

# Disable and enable the target mid-air, while messages

# are being transmitted.

toggle_netcons_target() {

	for i in $(seq 2)

	do

		if [ ! -d "${NETCONS_PATH}" ]

		then

			break

		fi

		echo 0 > "${NETCONS_PATH}"/enabled 2> /dev/null || true

		# Try to enable a bit harder, given it might fail to enable

		# Write to `enabled` might fail depending on the lock, which is

		# highly contentious here

		for _ in $(seq 5)

		do

			echo 1 > "${NETCONS_PATH}"/enabled 2> /dev/null || true

		done

	done

}

toggle_iface(){

	ip link set "${SRCIF}" down

	ip link set "${SRCIF}" up

}

# Start here

modprobe netdevsim 2> /dev/null || true

modprobe netconsole 2> /dev/null || true

# Check for basic system dependency and exit if not found

check_for_dependencies

# Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5)

echo "6 5" > /proc/sys/kernel/printk

# Remove the namespace, interfaces and netconsole target on exit

trap cleanup EXIT

# Create one namespace and two interfaces

set_network "${IP_VERSION}"

# Create a dynamic target for netconsole

create_dynamic_target "${FORMAT}"

for i in $(seq "$ITERATIONS")

do

	for _ in $(seq 10)

	do

		echo "${MSG}: ${TARGET} ${i}" > /dev/kmsg

	done

	wait

	if (( i % 30 == 0 )); then

		toggle_netcons_target &

	fi

	if (( i % 50 == 0 )); then

		# create some targets, enable them, send msg and disable

		# all in a parallel thread

		create_and_delete_random_target &

	fi

	if (( i % 70 == 0 )); then

		toggle_iface &

	fi

done

wait

exit "${EXIT_STATUS}"