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#!/bin/bash
set -e
EXPECTED="table inet filter {
map portmap {
type inet_service : verdict
counter
}
chain ssh_input {
}
chain wan_input {
tcp dport vmap @portmap
}
chain prerouting {
type filter hook prerouting priority -300; policy accept;
iif vmap { "lo" : jump wan_input }
}
}"
$NFT -f - <<< "$EXPECTED"
$NFT 'add element inet filter portmap { 22 : jump ssh_input, * : drop }'
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