1#!/usr/bin/env bash 2# SPDX-License-Identifier: GPL-2.0 3 4# This test validates that netconsole is able to resume a target that was 5# deactivated when its interface was removed when the interface is brought 6# back up. 7# 8# The test configures a netconsole target and then removes netdevsim module to 9# cause the interface to disappear. Targets are configured via cmdline to ensure 10# targets bound by interface name and mac address can be resumed. 11# The test verifies that the target moved to disabled state before adding 12# netdevsim and the interface back. 13# 14# Finally, the test verifies that the target is re-enabled automatically and 15# the message is received on the destination interface. 16# 17# Author: Andre Carvalho <asantostc@gmail.com> 18 19set -euo pipefail 20 21SCRIPTDIR=$(dirname "$(readlink -e "${BASH_SOURCE[0]}")") 22 23source "${SCRIPTDIR}"/../lib/sh/lib_netcons.sh 24 25SAVED_SRCMAC="" # to be populated later 26SAVED_DSTMAC="" # to be populated later 27 28modprobe netdevsim 2> /dev/null || true 29rmmod netconsole 2> /dev/null || true 30 31check_netconsole_module 32 33function cleanup() { 34 cleanup_netcons "${NETCONS_CONFIGFS}/cmdline0" 35 do_cleanup 36 rmmod netconsole 37} 38 39function trigger_reactivation() { 40 # Add back low level module 41 modprobe netdevsim 42 # Recreate namespace and two interfaces 43 set_network 44 # Restore MACs 45 ip netns exec "${NAMESPACE}" ip link set "${DSTIF}" \ 46 address "${SAVED_DSTMAC}" 47 if [ "${BINDMODE}" == "mac" ]; then 48 ip link set dev "${SRCIF}" down 49 ip link set dev "${SRCIF}" address "${SAVED_SRCMAC}" 50 # Rename device in order to trigger target resume, as initial 51 # when device was recreated it didn't have correct mac address. 52 ip link set dev "${SRCIF}" name "${TARGET}" 53 fi 54} 55 56function trigger_deactivation() { 57 # Start by storing mac addresses so we can be restored in reactivate 58 SAVED_DSTMAC=$(ip netns exec "${NAMESPACE}" \ 59 cat /sys/class/net/"$DSTIF"/address) 60 SAVED_SRCMAC=$(mac_get "${SRCIF}") 61 # Remove low level module 62 rmmod netdevsim 63} 64 65trap cleanup EXIT 66 67# Run the test twice, with different cmdline parameters 68for BINDMODE in "ifname" "mac" 69do 70 echo "Running with bind mode: ${BINDMODE}" >&2 71 # Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5) 72 echo "6 5" > /proc/sys/kernel/printk 73 74 # Create one namespace and two interfaces 75 set_network 76 77 # Create the command line for netconsole, with the configuration from 78 # the function above 79 CMDLINE=$(create_cmdline_str "${BINDMODE}") 80 81 # The content of kmsg will be save to the following file 82 OUTPUT_FILE="/tmp/${TARGET}-${BINDMODE}" 83 84 # Load the module, with the cmdline set 85 modprobe netconsole "${CMDLINE}" 86 # Expose cmdline target in configfs 87 mkdir "${NETCONS_CONFIGFS}/cmdline0" 88 89 # Target should be enabled 90 wait_target_state "cmdline0" "enabled" 91 92 # Trigger deactivation by unloading netdevsim module. Target should be 93 # disabled. 94 trigger_deactivation 95 wait_target_state "cmdline0" "disabled" 96 97 # Trigger reactivation by loading netdevsim, recreating the network and 98 # restoring mac addresses. Target should be re-enabled. 99 trigger_reactivation 100 wait_target_state "cmdline0" "enabled" 101 102 # Listen for netconsole port inside the namespace and destination 103 # interface 104 listen_port_and_save_to "${OUTPUT_FILE}" & 105 # Wait for socat to start and listen to the port. 106 wait_local_port_listen "${NAMESPACE}" "${PORT}" udp 107 # Send the message 108 echo "${MSG}: ${TARGET}" > /dev/kmsg 109 # Wait until socat saves the file to disk 110 busywait "${BUSYWAIT_TIMEOUT}" test -s "${OUTPUT_FILE}" 111 # Make sure the message was received in the dst part 112 # and exit 113 validate_msg "${OUTPUT_FILE}" 114 115 # kill socat in case it is still running 116 pkill_socat 117 # Cleanup & unload the module 118 cleanup 119 120 echo "${BINDMODE} : Test passed" >&2 121done 122 123trap - EXIT 124exit "${EXIT_STATUS}" 125