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 [ "${BINDMODE}" == "mac" ] && 48 [ "$(mac_get "${SRCIF}")" != "${SAVED_SRCMAC}" ]; then 49 ip link set dev "${SRCIF}" down 50 ip link set dev "${SRCIF}" address "${SAVED_SRCMAC}" 51 # Rename device in order to trigger target resume, as initial 52 # when device was recreated it didn't have correct mac address. 53 ip link set dev "${SRCIF}" name "${TARGET}" 54 fi 55} 56 57function trigger_deactivation() { 58 # Start by storing mac addresses so we can be restored in reactivate 59 SAVED_DSTMAC=$(ip netns exec "${NAMESPACE}" \ 60 cat /sys/class/net/"$DSTIF"/address) 61 SAVED_SRCMAC=$(mac_get "${SRCIF}") 62 # Remove low level module 63 rmmod netdevsim 64} 65 66trap cleanup EXIT 67 68# Run the test twice, with different cmdline parameters 69for BINDMODE in "ifname" "mac" 70do 71 echo "Running with bind mode: ${BINDMODE}" >&2 72 # Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5) 73 echo "6 5" > /proc/sys/kernel/printk 74 75 # Create one namespace and two interfaces 76 set_network 77 78 # Create the command line for netconsole, with the configuration from 79 # the function above 80 CMDLINE=$(create_cmdline_str "${BINDMODE}") 81 82 # The content of kmsg will be save to the following file 83 OUTPUT_FILE="/tmp/${TARGET}-${BINDMODE}" 84 85 # Load the module, with the cmdline set 86 modprobe netconsole "${CMDLINE}" 87 # Expose cmdline target in configfs 88 mkdir "${NETCONS_CONFIGFS}/cmdline0" 89 90 # Target should be enabled 91 wait_target_state "cmdline0" "enabled" 92 93 # Trigger deactivation by unloading netdevsim module. Target should be 94 # disabled. 95 trigger_deactivation 96 wait_target_state "cmdline0" "disabled" 97 98 # Trigger reactivation by loading netdevsim, recreating the network and 99 # restoring mac addresses. Target should be re-enabled. 100 trigger_reactivation 101 wait_target_state "cmdline0" "enabled" 102 103 # Listen for netconsole port inside the namespace and destination 104 # interface 105 listen_port_and_save_to "${OUTPUT_FILE}" & 106 # Wait for socat to start and listen to the port. 107 wait_local_port_listen "${NAMESPACE}" "${PORT}" udp 108 # Send the message 109 echo "${MSG}: ${TARGET}" > /dev/kmsg 110 # Wait until socat saves the file to disk 111 busywait "${BUSYWAIT_TIMEOUT}" test -s "${OUTPUT_FILE}" 112 # Make sure the message was received in the dst part 113 # and exit 114 validate_msg "${OUTPUT_FILE}" 115 116 # kill socat in case it is still running 117 pkill_socat 118 # Cleanup & unload the module 119 cleanup 120 121 echo "${BINDMODE} : Test passed" >&2 122done 123 124trap - EXIT 125exit "${EXIT_STATUS}" 126