Date: Wed, 6 Sep 2006 20:27:33 +0200 From: Max Laier <max@love2party.net> To: freebsd-doc@freebsd.org Cc: Remko Lodder <remko@freebsd.org>, John Archambeau <jcarchambeau@gmail.com> Subject: Re: docs/101114: icmptype names not in icmp(4) manpage Message-ID: <200609062027.41273.max@love2party.net> In-Reply-To: <b17ab3230609060546o6717d24ar2be845e07f83e975@mail.gmail.com> References: <200609051159.k85BxO6H049544@freefall.freebsd.org> <44FE6068.5000801@infracaninophile.co.uk> <b17ab3230609060546o6717d24ar2be845e07f83e975@mail.gmail.com>
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On Wednesday 06 September 2006 14:46, John Archambeau wrote:
> I must be one of the few people who rtfm's first. The Free/OpenBSD
> pf.conf manpage implies that number codes won't work but the icmptype
> abbreviations will.
Where does it say so? There even is an example with the number code in=20
pf.conf(5):
# pass out/in certain ICMP queries and keep state (ping)
# state matching is done on host addresses and ICMP id (not type/code),
# so replies (like 0/0 for 8/0) will match queries
# ICMP error messages (which always refer to a TCP/UDP packet) are
# handled by the TCP/UDP states
pass on $ext_if inet proto icmp all icmp-type 8 code 0 keep state
> Also consider the output you get from pfctl=20
> -s[ar] which is in the OpenBSD icmptype abbreviation, not the number
> code. Another ambiguity of filtering icmp traffic with the pf.conf
> manpage that should be addressed especially for those of us that
> migrate from ipfw to pf.
I can't see why the additional information in "-sr" is a bad thing.
> On 9/5/06, Matthew Seaman <m.seaman@infracaninophile.co.uk> wrote:
> > John Archambeau wrote:
> > > To create a pf.conf file (see man pf.conf) properly for filtering
> > > of icmp, you must specify the icmptype(s) by abbreviation per the
> > > OpenBSD icmp(4) manpage you wish to filter. It's not like ipfw
> > > where you can specify the icmptype by number, it must be the type
> > > by the abbreviation as specified as by the OpenBSD manpage for
> > > icmptypes.
> >
> > Are you sure about that?
> >
> > happy-idiot-talk:/etc:% uname -a
> > FreeBSD happy-idiot-talk.infracaninophile.co.uk 6.1-STABLE FreeBSD
> > 6.1-STABLE #6: Mon Aug 28 14:01:08 BST 2006 =20
> > root@happy-idiot-talk.infracaninophile.co.uk:/usr/obj/usr/src/sys/HAP
> >PY-IDIOT-TALK i386 happy-idiot-talk:/etc:% cat pf.conf
> >
> > icmp_types=3D"{ 0 3 8 11 }"
> >
> > scrub in
> > pass all
> >
> > pass inet proto icmp all icmp-type $icmp_types keep state
> >
> > happy-idiot-talk:/etc:% sudo pfctl -f pf.conf
> > happy-idiot-talk:/etc:% sudo pfctl -sr
> > scrub in all fragment reassemble
> > pass all
> > pass inet proto icmp all icmp-type echorep keep state
> > pass inet proto icmp all icmp-type unreach keep state
> > pass inet proto icmp all icmp-type echoreq keep state
> > pass inet proto icmp all icmp-type timex keep state
> >
> >
> > Cheers,
> >
> > Matthew
> >
> > --
> > Dr Matthew J Seaman MA, D.Phil. 7 Priory
> > Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey =20
> > Ramsgate Kent, CT11 9PW
>
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=2D-=20
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