List and reimport Ruleset fails with "Error: transport protocol mapping is only valid after transport protocol match"

[Henning Reich <henning.reich@xxxxxxxxx>]

Hi,

maybe somebody can give me a hint.

I'm using some systemd-nspawn containers with exposed Port.
Systemd creates automatically some masquerading rules and all works fine.
But if I restart nft.service, these rules are gone (obviously). So I
want to store and re-import them.

so this
nft list table ip io.systemd.nat | tee systemd_nat_rules
shows me:

table ip io.systemd.nat {
       set masq_saddr {
               type ipv4_addr
               flags interval
               elements = { 192.168.162.112/28 }
       }

       map map_port_ipport {
               type inet_proto . inet_service : ipv4_addr . inet_service
               elements = { tcp . 8088 : 192.168.162.117 . 80 }
       }

       chain prerouting {
               type nat hook prerouting priority dstnat + 1; policy accept;
               fib daddr type local dnat ip addr . port to meta
l4proto . th dport map @map_port_ipport
       }

       chain output {
               type nat hook output priority -99; policy accept;
               ip daddr != 127.0.0.0/8 oif "lo" dnat ip addr . port to
meta l4proto . th dport map @map_port_ipport
       }

       chain postrouting {
               type nat hook postrouting priority srcnat + 1; policy accept;
               ip saddr @masq_saddr masquerade
       }
}


But trying to import it:

nft -c -f systemd_nat_rules
results in:
ruleset:9:48-59: Error: transport protocol mapping is only valid after
transport protocol match
               type inet_proto . inet_service : ipv4_addr . inet_service



I also tried to store and import the complete ruleset (nft list
ruleset), but with the same error.

Thanks for your help.
Henning