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Date: Thu, 2 Oct 2014 14:32:22 +0400
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: "Alexander V. Chernikov" <melifaro@FreeBSD.org>
Subject: Re: svn commit: r272391 - in head/sys: netinet netinet6
Message-ID: <20141002103222.GG73266@FreeBSD.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
 Hiroki Sato <hrs@FreeBSD.org>, src-committers@freebsd.org
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On Thu, Oct 02, 2014 at 12:16:15PM +0400, Alexander V. Chernikov wrote:
A> On 02.10.2014 04:25, Hiroki Sato wrote:
A> > Author: hrs
A> > Date: Thu Oct  2 00:25:57 2014
A> > New Revision: 272391
A> > URL: https://svnweb.freebsd.org/changeset/base/272391
A> >
A> > Log:
A> >    Add an additional routing table lookup when m->m_pkthdr.fibnum is changed
A> >    at a PFIL hook in ip{,6}_output().  IPFW setfib rule did not perform
A> >    a routing table lookup when the destination address was not changed.
A> >    
A> >    CR:	D805
A> >
A> > Modified:
A> >    head/sys/netinet/ip_output.c
A> >    head/sys/netinet6/ip6_output.c
A> I'm not very happy with this.
A> We already have large conditional for checking if dst has changed, how 
A> you have added another conditional for fib..
A> This idea is quite weird: why should we try to check all this stuff for 
A> every packet instead of asking pfil consumers
A> to provide information they already know?
A> 
A> We'd better discuss something like M_DSTCHANGED flag instead of doing 
A> these hacks.

And here you suggest to abuse mbuf flags to merely carry return value of
a pfil hook :)

-- 
Totus tuus, Glebius.