Use ipset and conntrack with nftables

Use ipset and conntrack with nftables

[Amiq Nahas]

Hi Guys,

What would be the nftables equivalent for this rule:
iptables -D FORWARD -m conntrack --ctorigsrc 172.5.1.123 --ctproto tcp
-j MARK --set-mark 123

Also how can such a rule be made for a collection of different
ip-addresses in an ipset.

So as an example: 172.5.1.123, 172.5.1.124, 172.5.1.125, 172.5.1.126
all these ips are part of an ipset called 'myset'

How can a rule like mentioned above be applied to a collection of ips
denoted by an ipset 'myset'?

Thanks
Amiq

Re: Use ipset and conntrack with nftables

[Pablo Neira Ayuso]

On Tue, Aug 18, 2020 at 03:14:04PM +0530, Amiq Nahas wrote:
> Hi Guys,
> 
> What would be the nftables equivalent for this rule:
> iptables -D FORWARD -m conntrack --ctorigsrc 172.5.1.123 --ctproto tcp
> -j MARK --set-mark 123

# iptables-translate -A FORWARD -m conntrack --ctorigsrc 172.5.1.123 --ctproto tcp
nft add rule ip filter FORWARD ct original protocol tcp ct original saddr 172.5.1.123 counter

> Also how can such a rule be made for a collection of different
> ip-addresses in an ipset.
> 
> So as an example: 172.5.1.123, 172.5.1.124, 172.5.1.125, 172.5.1.126
> all these ips are part of an ipset called 'myset'
>
> How can a rule like mentioned above be applied to a collection of ips
> denoted by an ipset 'myset'?

  nft add rule ip filter FORWARD ct original protocol tcp ct original saddr @myset counter

You have to define the set:

  nft add set ip filter myset { type ipv4_addr \; }