235 lines · bash
1#!/usr/bin/env bash2# SPDX-License-Identifier: GPL-2.03 4# This test creates two netdevsim virtual interfaces, assigns one of them (the5# "destination interface") to a new namespace, and assigns IP addresses to both6# interfaces.7#8# It listens on the destination interface using socat and configures a dynamic9# target on netconsole, pointing to the destination IP address.10#11# Finally, it checks whether the message was received properly on the12# destination interface. Note that this test may pollute the kernel log buffer13# (dmesg) and relies on dynamic configuration and namespaces being configured.14#15# Author: Breno Leitao <leitao@debian.org>16 17set -euo pipefail18 19SCRIPTDIR=$(dirname "$(readlink -e "${BASH_SOURCE[0]}")")20 21# Simple script to test dynamic targets in netconsole22SRCIF="" # to be populated later23SRCIP=192.168.1.124DSTIF="" # to be populated later25DSTIP=192.168.1.226 27PORT="6666"28MSG="netconsole selftest"29TARGET=$(mktemp -u netcons_XXXXX)30DEFAULT_PRINTK_VALUES=$(cat /proc/sys/kernel/printk)31NETCONS_CONFIGFS="/sys/kernel/config/netconsole"32NETCONS_PATH="${NETCONS_CONFIGFS}"/"${TARGET}"33# NAMESPACE will be populated by setup_ns with a random value34NAMESPACE=""35 36# IDs for netdevsim37NSIM_DEV_1_ID=$((256 + RANDOM % 256))38NSIM_DEV_2_ID=$((512 + RANDOM % 256))39 40# Used to create and delete namespaces41source "${SCRIPTDIR}"/../../net/lib.sh42source "${SCRIPTDIR}"/../../net/net_helper.sh43 44# Create netdevsim interfaces45create_ifaces() {46 local NSIM_DEV_SYS_NEW=/sys/bus/netdevsim/new_device47 48 echo "$NSIM_DEV_2_ID" > "$NSIM_DEV_SYS_NEW"49 echo "$NSIM_DEV_1_ID" > "$NSIM_DEV_SYS_NEW"50 udevadm settle 2> /dev/null || true51 52 local NSIM1=/sys/bus/netdevsim/devices/netdevsim"$NSIM_DEV_1_ID"53 local NSIM2=/sys/bus/netdevsim/devices/netdevsim"$NSIM_DEV_2_ID"54 55 # These are global variables56 SRCIF=$(find "$NSIM1"/net -maxdepth 1 -type d ! \57 -path "$NSIM1"/net -exec basename {} \;)58 DSTIF=$(find "$NSIM2"/net -maxdepth 1 -type d ! \59 -path "$NSIM2"/net -exec basename {} \;)60}61 62link_ifaces() {63 local NSIM_DEV_SYS_LINK="/sys/bus/netdevsim/link_device"64 local SRCIF_IFIDX=$(cat /sys/class/net/"$SRCIF"/ifindex)65 local DSTIF_IFIDX=$(cat /sys/class/net/"$DSTIF"/ifindex)66 67 exec {NAMESPACE_FD}</var/run/netns/"${NAMESPACE}"68 exec {INITNS_FD}</proc/self/ns/net69 70 # Bind the dst interface to namespace71 ip link set "${DSTIF}" netns "${NAMESPACE}"72 73 # Linking one device to the other one (on the other namespace}74 if ! echo "${INITNS_FD}:$SRCIF_IFIDX $NAMESPACE_FD:$DSTIF_IFIDX" > $NSIM_DEV_SYS_LINK75 then76 echo "linking netdevsim1 with netdevsim2 should succeed"77 cleanup78 exit "${ksft_skip}"79 fi80}81 82function configure_ip() {83 # Configure the IPs for both interfaces84 ip netns exec "${NAMESPACE}" ip addr add "${DSTIP}"/24 dev "${DSTIF}"85 ip netns exec "${NAMESPACE}" ip link set "${DSTIF}" up86 87 ip addr add "${SRCIP}"/24 dev "${SRCIF}"88 ip link set "${SRCIF}" up89}90 91function set_network() {92 # setup_ns function is coming from lib.sh93 setup_ns NAMESPACE94 95 # Create both interfaces, and assign the destination to a different96 # namespace97 create_ifaces98 99 # Link both interfaces back to back100 link_ifaces101 102 configure_ip103}104 105function create_dynamic_target() {106 DSTMAC=$(ip netns exec "${NAMESPACE}" \107 ip link show "${DSTIF}" | awk '/ether/ {print $2}')108 109 # Create a dynamic target110 mkdir "${NETCONS_PATH}"111 112 echo "${DSTIP}" > "${NETCONS_PATH}"/remote_ip113 echo "${SRCIP}" > "${NETCONS_PATH}"/local_ip114 echo "${DSTMAC}" > "${NETCONS_PATH}"/remote_mac115 echo "${SRCIF}" > "${NETCONS_PATH}"/dev_name116 117 echo 1 > "${NETCONS_PATH}"/enabled118}119 120function cleanup() {121 local NSIM_DEV_SYS_DEL="/sys/bus/netdevsim/del_device"122 123 # delete netconsole dynamic reconfiguration124 echo 0 > "${NETCONS_PATH}"/enabled125 # Remove the configfs entry126 rmdir "${NETCONS_PATH}"127 128 # Delete netdevsim devices129 echo "$NSIM_DEV_2_ID" > "$NSIM_DEV_SYS_DEL"130 echo "$NSIM_DEV_1_ID" > "$NSIM_DEV_SYS_DEL"131 132 # this is coming from lib.sh133 cleanup_all_ns134 135 # Restoring printk configurations136 echo "${DEFAULT_PRINTK_VALUES}" > /proc/sys/kernel/printk137}138 139function listen_port_and_save_to() {140 local OUTPUT=${1}141 # Just wait for 2 seconds142 timeout 2 ip netns exec "${NAMESPACE}" \143 socat UDP-LISTEN:"${PORT}",fork "${OUTPUT}"144}145 146function validate_result() {147 local TMPFILENAME="$1"148 149 # Check if the file exists150 if [ ! -f "$TMPFILENAME" ]; then151 echo "FAIL: File was not generated." >&2152 exit "${ksft_fail}"153 fi154 155 if ! grep -q "${MSG}" "${TMPFILENAME}"; then156 echo "FAIL: ${MSG} not found in ${TMPFILENAME}" >&2157 cat "${TMPFILENAME}" >&2158 exit "${ksft_fail}"159 fi160 161 # Delete the file once it is validated, otherwise keep it162 # for debugging purposes163 rm "${TMPFILENAME}"164 exit "${ksft_pass}"165}166 167function check_for_dependencies() {168 if [ "$(id -u)" -ne 0 ]; then169 echo "This test must be run as root" >&2170 exit "${ksft_skip}"171 fi172 173 if ! which socat > /dev/null ; then174 echo "SKIP: socat(1) is not available" >&2175 exit "${ksft_skip}"176 fi177 178 if ! which ip > /dev/null ; then179 echo "SKIP: ip(1) is not available" >&2180 exit "${ksft_skip}"181 fi182 183 if ! which udevadm > /dev/null ; then184 echo "SKIP: udevadm(1) is not available" >&2185 exit "${ksft_skip}"186 fi187 188 if [ ! -d "${NETCONS_CONFIGFS}" ]; then189 echo "SKIP: directory ${NETCONS_CONFIGFS} does not exist. Check if NETCONSOLE_DYNAMIC is enabled" >&2190 exit "${ksft_skip}"191 fi192 193 if ip link show "${DSTIF}" 2> /dev/null; then194 echo "SKIP: interface ${DSTIF} exists in the system. Not overwriting it." >&2195 exit "${ksft_skip}"196 fi197 198 if ip addr list | grep -E "inet.*(${SRCIP}|${DSTIP})" 2> /dev/null; then199 echo "SKIP: IPs already in use. Skipping it" >&2200 exit "${ksft_skip}"201 fi202}203 204# ========== #205# Start here #206# ========== #207modprobe netdevsim 2> /dev/null || true208modprobe netconsole 2> /dev/null || true209 210# The content of kmsg will be save to the following file211OUTPUT_FILE="/tmp/${TARGET}"212 213# Check for basic system dependency and exit if not found214check_for_dependencies215# Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5)216echo "6 5" > /proc/sys/kernel/printk217# Remove the namespace, interfaces and netconsole target on exit218trap cleanup EXIT219# Create one namespace and two interfaces220set_network221# Create a dynamic target for netconsole222create_dynamic_target223# Listed for netconsole port inside the namespace and destination interface224listen_port_and_save_to "${OUTPUT_FILE}" &225# Wait for socat to start and listen to the port.226wait_local_port_listen "${NAMESPACE}" "${PORT}" udp227# Send the message228echo "${MSG}: ${TARGET}" > /dev/kmsg229# Wait until socat saves the file to disk230busywait "${BUSYWAIT_TIMEOUT}" test -s "${OUTPUT_FILE}"231 232# Make sure the message was received in the dst part233# and exit234validate_result "${OUTPUT_FILE}"235