#!/bin/bash# SPDX-License-Identifier: GPL-2.0+## Author: Justin Iurman <justin.iurman@uliege.be>## WARNING# -------# This is just a dummy script that triggers encap cases with possible dst cache# reference loops in affected lwt users (see list below). Some cases are# pathological configurations for simplicity, others are valid. Overall, we# don't want this issue to happen, no matter what. In order to catch any# reference loops, kmemleak MUST be used. The results alone are always blindly# successful, don't rely on them. Note that the following tests may crash the# kernel if the fix to prevent lwtunnel_{input|output|xmit}() reentry loops is# not present.## Affected lwt users so far (please update accordingly if needed):#  - ila_lwt (output only)#  - ioam6_iptunnel (output only)#  - rpl_iptunnel (both input and output)#  - seg6_iptunnel (both input and output) source lib.sh check_compatibility(){	setup_ns tmp_node &>/dev/null	if [ $? != 0 ]; then		echo "SKIP: Cannot create netns."		exit $ksft_skip	fi 	ip link add name veth0 netns $tmp_node type veth \		peer name veth1 netns $tmp_node &>/dev/null	local ret=$? 	ip -netns $tmp_node link set veth0 up &>/dev/null	ret=$((ret + $?)) 	ip -netns $tmp_node link set veth1 up &>/dev/null	ret=$((ret + $?)) 	if [ $ret != 0 ]; then		echo "SKIP: Cannot configure links."		cleanup_ns $tmp_node		exit $ksft_skip	fi 	lsmod 2>/dev/null | grep -q "ila"	ila_lsmod=$?	[ $ila_lsmod != 0 ] && modprobe ila &>/dev/null 	ip -netns $tmp_node route add 2001:db8:1::/64 \		encap ila 1:2:3:4 csum-mode no-action ident-type luid \			hook-type output \		dev veth0 &>/dev/null 	ip -netns $tmp_node route add 2001:db8:2::/64 \		encap ioam6 trace prealloc type 0x800000 ns 0 size 4 \		dev veth0 &>/dev/null 	ip -netns $tmp_node route add 2001:db8:3::/64 \		encap rpl segs 2001:db8:3::1 dev veth0 &>/dev/null 	ip -netns $tmp_node route add 2001:db8:4::/64 \		encap seg6 mode inline segs 2001:db8:4::1 dev veth0 &>/dev/null 	ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap ila"	skip_ila=$? 	ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap ioam6"	skip_ioam6=$? 	ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap rpl"	skip_rpl=$? 	ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap seg6"	skip_seg6=$? 	cleanup_ns $tmp_node} setup(){	setup_ns alpha beta gamma &>/dev/null 	ip link add name veth-alpha netns $alpha type veth \		peer name veth-betaL netns $beta &>/dev/null 	ip link add name veth-betaR netns $beta type veth \		peer name veth-gamma netns $gamma &>/dev/null 	ip -netns $alpha link set veth-alpha name veth0 &>/dev/null	ip -netns $beta link set veth-betaL name veth0 &>/dev/null	ip -netns $beta link set veth-betaR name veth1 &>/dev/null	ip -netns $gamma link set veth-gamma name veth0 &>/dev/null 	ip -netns $alpha addr add 2001:db8:1::2/64 dev veth0 &>/dev/null	ip -netns $alpha link set veth0 up &>/dev/null	ip -netns $alpha link set lo up &>/dev/null	ip -netns $alpha route add 2001:db8:2::/64 \		via 2001:db8:1::1 dev veth0 &>/dev/null 	ip -netns $beta addr add 2001:db8:1::1/64 dev veth0 &>/dev/null	ip -netns $beta addr add 2001:db8:2::1/64 dev veth1 &>/dev/null	ip -netns $beta link set veth0 up &>/dev/null	ip -netns $beta link set veth1 up &>/dev/null	ip -netns $beta link set lo up &>/dev/null	ip -netns $beta route del 2001:db8:2::/64	ip -netns $beta route add 2001:db8:2::/64 dev veth1	ip netns exec $beta \		sysctl -wq net.ipv6.conf.all.forwarding=1 &>/dev/null 	ip -netns $gamma addr add 2001:db8:2::2/64 dev veth0 &>/dev/null	ip -netns $gamma link set veth0 up &>/dev/null	ip -netns $gamma link set lo up &>/dev/null	ip -netns $gamma route add 2001:db8:1::/64 \		via 2001:db8:2::1 dev veth0 &>/dev/null 	sleep 1 	ip netns exec $alpha ping6 -c 5 -W 1 2001:db8:2::2 &>/dev/null	if [ $? != 0 ]; then		echo "SKIP: Setup failed."		exit $ksft_skip	fi 	sleep 1} cleanup(){	cleanup_ns $alpha $beta $gamma	[ $ila_lsmod != 0 ] && modprobe -r ila &>/dev/null} run_ila(){	if [ $skip_ila != 0 ]; then		echo "SKIP: ila (output)"		return	fi 	ip -netns $beta route del 2001:db8:2::/64	ip -netns $beta route add 2001:db8:2:0:0:0:0:2/128 \		encap ila 2001:db8:2:0 csum-mode no-action ident-type luid \			hook-type output \		dev veth1 &>/dev/null	sleep 1 	echo "TEST: ila (output)"	ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null	sleep 1 	ip -netns $beta route del 2001:db8:2:0:0:0:0:2/128	ip -netns $beta route add 2001:db8:2::/64 dev veth1	sleep 1} run_ioam6(){	if [ $skip_ioam6 != 0 ]; then		echo "SKIP: ioam6 (output)"		return	fi 	ip -netns $beta route change 2001:db8:2::/64 \		encap ioam6 trace prealloc type 0x800000 ns 1 size 4 \		dev veth1 &>/dev/null	sleep 1 	echo "TEST: ioam6 (output)"	ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null	sleep 1} run_rpl(){	if [ $skip_rpl != 0 ]; then		echo "SKIP: rpl (input)"		echo "SKIP: rpl (output)"		return	fi 	ip -netns $beta route change 2001:db8:2::/64 \		encap rpl segs 2001:db8:2::2 \		dev veth1 &>/dev/null	sleep 1 	echo "TEST: rpl (input)"	ip netns exec $alpha ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null	sleep 1 	echo "TEST: rpl (output)"	ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null	sleep 1} run_seg6(){	if [ $skip_seg6 != 0 ]; then		echo "SKIP: seg6 (input)"		echo "SKIP: seg6 (output)"		return	fi 	ip -netns $beta route change 2001:db8:2::/64 \		encap seg6 mode inline segs 2001:db8:2::2 \		dev veth1 &>/dev/null	sleep 1 	echo "TEST: seg6 (input)"	ip netns exec $alpha ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null	sleep 1 	echo "TEST: seg6 (output)"	ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null	sleep 1} run(){	run_ila	run_ioam6	run_rpl	run_seg6} if [ "$(id -u)" -ne 0 ]; then	echo "SKIP: Need root privileges."	exit $ksft_skipfi if [ ! -x "$(command -v ip)" ]; then	echo "SKIP: Could not run test without ip tool."	exit $ksft_skipfi check_compatibility trap cleanup EXIT setuprun exit $ksft_pass