From: Patrick McHardy <kaber@trash.net>
To: Jan Engelhardt <jengelh@medozas.de>
Cc: Pascal Hambourg <pascal.mail@plouf.fr.eu.org>,
Netfilter Development Mailinglist
<netfilter-devel@vger.kernel.org>
Subject: Re: netfilter: nf_conntrack: log packets dropped by helpers
Date: Wed, 26 Aug 2009 15:20:27 +0200 [thread overview]
Message-ID: <4A95369B.10404@trash.net> (raw)
In-Reply-To: <alpine.LSU.2.00.0908261503340.32385@fbirervta.pbzchgretzou.qr>
Jan Engelhardt wrote:
> On Wednesday 2009-08-26 14:55, Patrick McHardy wrote:
>
>> Pascal Hambourg wrote:
>>> Hello,
>>>
>>> May I ask what are the reasons for a helper to drop packets ?
>> Mainly parsing errors, memory allocation errors and bugs.
>
> I am not so quite sure whether parsing errors (like, a port > 65535 for
> FTP) should cause them to be dropped; after all, it might be, for
> example, a vendor-specific form of a protocol that just does not fit the
> nf_conntrack_ftp parsing exactly. That is to say, packets should be let
> through, though without setting up expectations.
Thats what usually happens. There are a few exceptions though, most
notably the SIP helper, which drops packets since they might already
have been mangled.
prev parent reply other threads:[~2009-08-26 13:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-25 12:24 netfilter: nf_conntrack: log packets dropped by helpers Patrick McHardy
2009-08-25 13:23 ` Jan Engelhardt
2009-08-25 13:26 ` Patrick McHardy
2009-08-25 15:46 ` Pascal Hambourg
2009-08-26 12:55 ` Patrick McHardy
2009-08-26 13:04 ` Jan Engelhardt
2009-08-26 13:15 ` Jozsef Kadlecsik
2009-08-26 14:43 ` Pascal Hambourg
2009-08-26 19:19 ` Jozsef Kadlecsik
2009-08-26 13:20 ` Patrick McHardy [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4A95369B.10404@trash.net \
--to=kaber@trash.net \
--cc=jengelh@medozas.de \
--cc=netfilter-devel@vger.kernel.org \
--cc=pascal.mail@plouf.fr.eu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.