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#!/bin/bash
tmpfile=$(mktemp)
if [ ! -w $tmpfile ] ; then
echo "Failed to create tmp file" >&2
exit 0
fi
trap "rm -rf $tmpfile" EXIT # cleanup if aborted
RULESET="table ip mangle {
set blackhole {
type ipv4_addr
elements = { 192.168.1.4, 192.168.1.5 }
}
chain prerouting {
type filter hook prerouting priority 0; policy accept;
tcp dport { ssh, http } accept
ip saddr @blackhole drop
icmp type echo-request accept
iifname \"lo\" accept
icmp type echo-request counter packets 0 bytes 0
ct state established,related accept
tcp flags != syn counter packets 7 bytes 841
ip saddr 192.168.1.100 ip daddr 192.168.1.1 counter packets 0 bytes 0
}
}
table arp x {
chain y {
arp htype 22
arp ptype ip
arp operation != rrequest
arp operation { request, reply, rrequest, rreply, inrequest, inreply, nak }
arp hlen 33-45
}
}
table bridge x {
chain y {
type filter hook input priority 0; policy accept;
vlan id 4094
vlan id 4094 vlan cfi 0
vlan id 1 ip saddr 10.0.0.0/23 udp dport domain
}
}
table ip6 x {
chain y {
type nat hook postrouting priority 0; policy accept;
icmpv6 id 33-45
ip6 daddr fe00::1-fe00::200 udp dport domain counter packets 0 bytes 0
meta l4proto tcp masquerade to :1024
iifname \"wlan0\" ct state established,new tcp dport vmap { ssh : drop, 222 : drop } masquerade
tcp dport ssh ip6 daddr 1::2 ether saddr 00:0f:54:0c:11:04 accept
ip6 daddr fe00::1-fe00::200 udp dport domain counter packets 0 bytes 0 masquerade
}
}"
echo "$RULESET" > $tmpfile
$NFT -f $tmpfile
$NFT export vm json > $tmpfile
$NFT flush ruleset
cat $tmpfile | $NFT import vm json
RESULT="$($NFT list ruleset)"
if [ "$RULESET" != "$RESULT" ] ; then
DIFF="$(which diff)"
[ -x $DIFF ] && $DIFF -u <(echo "$RULESET") <(echo "$RESULT")
fi
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