netdev - Re: [PATCHv2 nf] selftests: netfilter: disable rp

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Date:   Fri, 11 Feb 2022 00:00:53 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        Florian Westphal <fw@...len.de>, Yi Chen <yiche@...hat.com>
Subject: Re: [PATCHv2 nf] selftests: netfilter: disable rp_filter on router

On Thu, Feb 10, 2022 at 05:50:56PM +0800, Hangbin Liu wrote:
> Some distros may enalbe rp_filter by default. After ns1 change addr to
> 10.0.2.99 and set default router to 10.0.2.1, while the connected router
> address is still 10.0.1.1. The router will not reply the arp request
> from ns1. Fix it by setting the router's veth0 rp_filter to 0.
> 
> Before the fix:
>   # ./nft_fib.sh
>   PASS: fib expression did not cause unwanted packet drops
>   Netns nsrouter-HQkDORO2 fib counter doesn't match expected packet count of 1 for 1.1.1.1
>   table inet filter {
>           chain prerouting {
>                   type filter hook prerouting priority filter; policy accept;
>                   ip daddr 1.1.1.1 fib saddr . iif oif missing counter packets 0 bytes 0 drop
>                   ip6 daddr 1c3::c01d fib saddr . iif oif missing counter packets 0 bytes 0 drop
>           }
>   }
> 
> After the fix:
>   # ./nft_fib.sh
>   PASS: fib expression did not cause unwanted packet drops
>   PASS: fib expression did drop packets for 1.1.1.1
>   PASS: fib expression did drop packets for 1c3::c01d

Applied, thanks