From: Changli Gao <xiaosuo@gmail.com>
To: Jan Engelhardt <jengelh@medozas.de>
Cc: Patrick McHardy <kaber@trash.net>,
"David S. Miller" <davem@davemloft.net>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
"Pekka Savola (ipv6)" <pekkas@netcore.fi>,
James Morris <jmorris@namei.org>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
netfilter-devel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH] ip6tables: use skb->len for accounting
Date: Fri, 23 Jul 2010 14:38:20 +0800 [thread overview]
Message-ID: <AANLkTik_2HMl3OaGvZiJPCO09Bu4lj6S0PNWFbw1BGXe@mail.gmail.com> (raw)
In-Reply-To: <alpine.LSU.2.01.1007230813300.815@obet.zrqbmnf.qr>
On Fri, Jul 23, 2010 at 2:16 PM, Jan Engelhardt <jengelh@medozas.de> wrote:
>
>
> I wonder how this fares with trailing padding or data, like, when
> you have a standard v4/v6 packet created in a raw socket, and append
> a bunch of \0s to it.
>
>
For the packets received, ip_rcv, ipv6_rcv and bridge all call
pskb_trim_rcsum before feeding them to netfilter. The raw packets are
sent via dev_queue_xmit(), and they don't pass through the output path
of netfilter. One case, maybe the queued packets mangled "wrongly" in
userspace are reinjected, however, we can't prevent a user from
changing the payload_len wrongly.
--
Regards,
Changli Gao(xiaosuo@gmail.com)
next prev parent reply other threads:[~2010-07-23 6:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-23 3:31 [PATCH] ip6tables: use skb->len for accounting Changli Gao
2010-07-23 6:16 ` Jan Engelhardt
2010-07-23 6:38 ` Changli Gao [this message]
2010-07-23 11:48 ` Patrick McHardy
2010-07-23 13:05 ` Changli Gao
2010-07-23 14:21 ` Patrick McHardy
2010-07-23 16:40 ` Jan Engelhardt
2010-07-23 14:24 ` Patrick McHardy
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=AANLkTik_2HMl3OaGvZiJPCO09Bu4lj6S0PNWFbw1BGXe@mail.gmail.com \
--to=xiaosuo@gmail.com \
--cc=davem@davemloft.net \
--cc=jengelh@medozas.de \
--cc=jmorris@namei.org \
--cc=kaber@trash.net \
--cc=kuznet@ms2.inr.ac.ru \
--cc=netdev@vger.kernel.org \
--cc=netfilter-devel@vger.kernel.org \
--cc=pekkas@netcore.fi \
--cc=yoshfuji@linux-ipv6.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).