39 lines
1.0 KiB
Plaintext
39 lines
1.0 KiB
Plaintext
# Sample configuration snippet for nftables service.
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# Meant to be included by main.nft, not for direct use.
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# dedicated table for IPv4
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table ip nftables_svc {
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# interfaces to masquerade traffic from
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set masq_interfaces {
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type ifname
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elements = { "virbr0" }
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}
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# networks to masquerade traffic from
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# 'interval' flag is required to support subnets
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set masq_ips {
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type ipv4_addr
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flags interval
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elements = { 192.168.122.0/24 }
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}
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# force port randomization for non-locally originated connections using
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# suspicious port values to prevent port-shadow attacks, i.e.
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# accidental matching of new inbound connections vs. existing ones
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chain do_masquerade {
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meta iif > 0 th sport < 16384 th dport >= 32768 masquerade random
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masquerade
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}
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# base-chain to manipulate conntrack in postrouting,
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# will see packets for new or related traffic only
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chain POSTROUTING {
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type nat hook postrouting priority srcnat + 20
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policy accept
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iifname @masq_interfaces oifname != @masq_interfaces jump do_masquerade
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ip saddr @masq_ips jump do_masquerade
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}
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}
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