#!/bin/bash# SPDX-License-Identifier: GPL-2.0 source lib.sh IP4=172.16.0.1/24TGT4=172.16.0.2IP6=2001:db8:1::1/64TGT6=2001:db8:1::2MARK=1000 cleanup(){    cleanup_ns $NS} trap cleanup EXIT # Namespacessetup_ns NS ip netns exec $NS sysctl -w net.ipv4.ping_group_range='0 2147483647' > /dev/null # Connectivityip -netns $NS link add type dummyip -netns $NS link set dev dummy0 upip -netns $NS addr add $IP4 dev dummy0ip -netns $NS addr add $IP6 dev dummy0 ip -netns $NS rule add fwmark $MARK lookup 300ip -6 -netns $NS rule add fwmark $MARK lookup 300ip -netns $NS route add prohibit any table 300ip -6 -netns $NS route add prohibit any table 300 # TestBAD=0TOTAL=0 check_result() {    ((TOTAL++))    if [ $1 -ne $2 ]; then	echo "  Case $3 returned $1, expected $2"	((BAD++))    fi} for ovr in setsock cmsg both; do    for i in 4 6; do	[ $i == 4 ] && TGT=$TGT4 || TGT=$TGT6 	for p in u i r; do	    [ $p == "u" ] && prot=UDP	    [ $p == "i" ] && prot=ICMP	    [ $p == "r" ] && prot=RAW 	    [ $ovr == "setsock" ] && m="-M"	    [ $ovr == "cmsg" ]    && m="-m"	    [ $ovr == "both" ]    && m="-M $MARK -m" 	    ip netns exec $NS ./cmsg_sender -$i -p $p $m $((MARK + 1)) $TGT 1234	    check_result $? 0 "$prot $ovr - pass" 	    [ $ovr == "diff" ] && m="-M $((MARK + 1)) -m" 	    ip netns exec $NS ./cmsg_sender -$i -p $p $m $MARK -s $TGT 1234	    check_result $? 1 "$prot $ovr - rejection"	done    donedone # Summaryif [ $BAD -ne 0 ]; then    echo "FAIL - $BAD/$TOTAL cases failed"    exit 1else    echo "OK"    exit 0fi