Re: [PATCH v4] add stealth mode

From	Eric Dumazet <eric.dumazet@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v4] add stealth mode
Date	2015-09-23 19:30 +0200
Message-ID	<qbW1J-2ph-23@gated-at.bofh.it> (permalink)
References	<q93M6-5yj-19@gated-at.bofh.it> <q9hFo-Ro-13@gated-at.bofh.it> <q9iL8-2Ej-13@gated-at.bofh.it> <qbVfj-1fg-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, 2015-09-23 at 18:36 +0200, Matteo Croce wrote:
> 2015-09-16 13:06 GMT+02:00 Florian Westphal <fw@strlen.de>:
> >
> > Matteo Croce <matteo@openwrt.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

Yes, but this adds code in many places, even for people not caring of
such protection.

The point is : people wanting firewall like protections should instead
use netfilter framework.


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Thread

Re: [PATCH v4] add stealth mode Matteo Croce <matteo@openwrt.org> - 2015-09-23 18:40 +0200
  Re: [PATCH v4] add stealth mode Eric Dumazet <eric.dumazet@gmail.com> - 2015-09-23 19:30 +0200
    Re: [PATCH v4] add stealth mode David Miller <davem@davemloft.net> - 2015-09-23 20:20 +0200
  Re: [PATCH v4] add stealth mode David Miller <davem@davemloft.net> - 2015-09-23 20:20 +0200

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