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#!/bin/bash

# test using many netns

# arbitry value of 'many'
HOWMANY=20

IP=$(which ip)
if [ ! -x "$IP" ] ; then
	echo "E: no ip binary" >&2
	exit 1
fi

tmpfile=$(mktemp)
if [ ! -w $tmpfile ] ; then
	echo "Failed to create tmp file" >&2
	exit 0
fi

trap "rm -rf $tmpfile" EXIT # cleanup if aborted

RULESET="table ip t {
	set s {
		type ipv4_addr
		elements = { 1.1.0.0}
	}

	chain c {
		ct state new
		udp dport { 12345}
		ip saddr @s drop
		jump other
	}

	chain other {
	}
}
table ip6 t {
	set s {
		type ipv6_addr
		elements = { fe00::1}
	}

	chain c {
		ct state new
		udp dport { 12345}
		ip6 saddr @s drop
		jump other
	}

	chain other {
	}
}
table inet t {
	set s {
		type ipv6_addr
		elements = { fe00::1}
	}

	chain c {
		ct state new
		udp dport { 12345}
		ip6 saddr @s drop
		jump other
	}

	chain other {
	}
}
table bridge t {
	chain c {
		jump other
	}

	chain other {
		accept
	}
}
table arp t {
	chain c {
		jump other
	}

	chain other {
		accept
	}
}"

echo "$RULESET" > $tmpfile

function test_netns()
{
	local NETNS_NAME=$1
	$IP netns add $NETNS_NAME
	if [ $? -ne 0 ] ; then
		echo "E: unable to create netns" >&2
		exit 1
	fi

	$IP netns exec $NETNS_NAME $NFT -f $tmpfile
	if [ $? -ne 0 ] ; then
		echo "E: unable to load ruleset in netns" >&2
		$IP netns del $NETNS_NAME
		exit 1
	fi

	KERNEL_RULESET="$($IP netns exec $NETNS_NAME $NFT list ruleset)"
	if [ "$RULESET" != "$KERNEL_RULESET" ] ; then
		echo "E: ruleset in netns $NETNS_NAME differs from the loaded" >&2
	        DIFF="$(which diff)"
	        [ -x $DIFF ] && $DIFF -u <(echo "$RULESET") <(echo "$KERNEL_RULESET")
	        exit 1
	fi

	$IP netns del $NETNS_NAME
}

for i in $(seq 1 $HOWMANY) ; do
	NETNS_NAME="$netns${i}_$(basename "$0")"
	test_netns $NETNS_NAME
done

exit 0