From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: ingress hook on interface with multiple addresses ?
Date: Wed, 12 Aug 2020 22:57:05 +0200
Message-ID: <20200812205705.GA1660@breakpoint.cc>
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To: sean darcy <seandarcy2@gmail.com>
Cc: netfilter@vger.kernel.org

sean darcy <seandarcy2@gmail.com> wrote:
> I have an interface with 2 ip addresses:
> 
> ip a
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
> default qlen 1000
> ............
> 2: enp1s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state
> UP group default qlen 1000
>     link/ether 98:29:a6:48:49:8e brd ff:ff:ff:ff:ff:ff
>     inet 10.0.0.61/24 brd 10.0.0.255 scope global noprefixroute enp1s0f1
>        valid_lft forever preferred_lft forever
>     inet 10.0.0.2/32 scope global noprefixroute enp1s0f1
>        valid_lft forever preferred_lft forever
> 
> When I try to add a chain on ingress hook, nft is unhappy:
> 
> nft list table netdev foo
> table netdev foo {
> 	set allowlist {
> 		type ipv4_addr
> 		flags interval
> 		auto-merge
> 		elements = { 10.0.0.0/8, 127.0.0.1 }
> 	}
> }
> 
> 
> nft 'add chain netdev foo dev0filter { type filter hook ingress device
> enp1s0f1 priority 0 ; }'
> Error: Could not process rule: No such file or directory
> add chain netdev foo dev0filter { type filter hook ingress device enp1s0f1
> priority 0 ; }

works fine for me on 5.7.11 kernel (with adjusted interface name).

> Can you have a chain on ingress hook for an interface that has multiple
> addresses ?

Its not relevant how many addresses are assigned.