linux-kernel - Re: [2.6 patch] unexport icmpmsg

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Message-ID: <OF621D1730.3D3366AC-ON8825737E.0069CDD5-8825737E.006AEDF9@us.ibm.com>
Date:	Wed, 24 Oct 2007 12:29:01 -0700
From:	David Stevens <dlstevens@...ibm.com>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	netdev-owner@...r.kernel.org
Subject: Re: [2.6 patch] unexport icmpmsg_statistics

netdev-owner@...r.kernel.org wrote on 10/24/2007 12:14:37 PM:

> On Wed, Oct 24, 2007 at 12:07:45PM -0700, David Stevens wrote:
> > netdev-owner@...r.kernel.org wrote on 10/24/2007 09:24:10 AM:
> > 
> > > This patch removes the unused EXPORT_SYMBOL(icmpmsg_statistics).
> > > 
> > > Signed-off-by: Adrian Bunk <bunk@...nel.org>
> > > 
> > > ---
> > > 4ce74657ac0b1bdcb4c7bc359d05643f8cc4a08b 
> > > diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
> > > index 272c69e..233de06 100644
> > > --- a/net/ipv4/icmp.c
> > > +++ b/net/ipv4/icmp.c
> > > @@ -1104,5 +1104,4 @@ void __init icmp_init(struct net_proto_family 
> > *ops)
> > >  EXPORT_SYMBOL(icmp_err_convert);
> > >  EXPORT_SYMBOL(icmp_send);
> > >  EXPORT_SYMBOL(icmp_statistics);
> > > -EXPORT_SYMBOL(icmpmsg_statistics);
> > >  EXPORT_SYMBOL(xrlim_allow);
> > 
> >         "icmpmsg_statistics" belongs with (and replaces some of the 
> > old...)
> > "icmp_statistics". I'm not sure that any modules use it, but I think 
you
> > should remove both or neither.
> 
> icmp_statistics is used by the dccp_ipv4 and sctp modules.

        The only items left in icmp_statistics are "InMsgs, InErrs, 
OutMsgs, OutErrs",
so if dccp and sctp are sending or receiving any in or out ICMP messages, 
they
should be using the new macros (which reference icmpmsg_statistics, not
icmp_statistics) to count them.
        I took a quick look at SCTP. I don't know if that's going through 
icmp_rcv()
or not; if so, I think it's double-counting; if not, then it isn't 
counting the
individual types (as it should), and it should have ICMPMSG macros doing 
that.

        So, again, icmpmsg_statistics either should stay exported, or 
neither
icmpmsg_statistics nor icmp_statistics should be exported (depending on 
how
SCTP and DCCP code is resolved). It's incorrect in the current code to
incrememnt ICMP_MIB_INMSGS without incrementing one of the types too.

 +-DLS


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