netdev - Re: [PATCH v4] add stealth mode

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Date:	Wed, 23 Sep 2015 18:36:12 +0200
From:	Matteo Croce <matteo@...nwrt.org>
To:	Florian Westphal <fw@...len.de>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] add stealth mode

2015-09-16 13:06 GMT+02:00 Florian Westphal <fw@...len.de>:
>
> Matteo Croce <matteo@...nwrt.org> wrote:
> > Add option to disable any reply not related to a listening socket,
> > like RST/ACK for TCP and ICMP Port-Unreachable for UDP.
> > Also disables ICMP replies to echo request and timestamp.
> > The stealth mode can be enabled selectively for a single interface.
>
> I think it would make more sense to extend the socket match
> in xtables if it can't be used to achive this already.
>
> seems like
> *filter
> :INPUT ACCEPT [0:0]
> -A INPUT -p tcp -m socket --nowildcard -j ACCEPT
> -A INPUT -p tcp -j DROP
> COMMIT
>
> Already does what you want for tcp, udp should work too.
> I'd much rather see xtables and/or nftables to be extended
> with whatever feature(s) are needed to configure such a policy
> rather than pushing this into the core network stack.

The point is to do the filtering without *tables at all,
like /proc/sys/net/ipv4/icmp_echo_ignore_all does for pings

-- 
Matteo Croce
OpenWrt Developer
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