netdev - Re: interprocess communication with netlinks

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Message-ID: <20090512162701.GC5019@hmsreliant.think-freely.org>
Date:	Tue, 12 May 2009 12:27:01 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Daniel Lezcano <daniel.lezcano@...e.fr>,
	Tianjin Zhang <ztianjin@...il.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: interprocess communication with netlinks

On Mon, May 11, 2009 at 12:36:43PM -0700, Randy Dunlap wrote:
> Daniel Lezcano wrote:
> > Tianjin Zhang wrote:
> >> i think the following  material can help you.
> >>
> >> 1. http://lwn.net/Articles/262385/  introduce the IPN,
> >>
> >> 2. http://www.linuxjournal.com/article/7356   introduce how to use
> >> netlink
> >> socket and why
> >>   
> > Thank you but I already saw these documents. I am used to play with the
> > netlink for kernel <-> user communication, I am wondering if it is
> > possible to have the applications to communicate, I mean user <-> user.
> > 
> > I saw a comment in the mailing list archive
> > http://kerneltrap.org/mailarchive/linux-kernel/2007/12/7/493793/thread
> > 
> > "... with minor adjustments we have the facilities to
> > meet your needs.  There is no need for yet-another-protocol to do what
> > you're trying to do, we already have too much duplicated
> > functionality."
> > 
> > 
> > Were these "minor adjustements" done ?
> > 
> > Thanks
> >  -- Daniel
> > 
> >> On Fri, May 8, 2009 at 12:00 AM, Daniel Lezcano
> >> <daniel.lezcano@...e.fr>wrote:
> >>
> >>  
> >>> Hi netdev gurus !
> >>>
> >>> I am trying to make several processes to communicate via the netlink
> >>> protocol.
> >>>
> >>> I saw a discussion around the AF_IPN (inter process communication)
> >>> protocol
> >>> and it seems the same can be done with the AF_NETLINK protocol with
> >>> minor
> >>> modifications in the kernel. Were these modifications done ?
> >>>
> >>> I am trying to use multicast between several processes, for
> >>> notification.
> >>>
> >>> What protocol should I use to create the socket ?
> >>>
> >>>   fd = socket(PF_NETLINK, SOCK_RAW,  ???);
> >>>
> >>> I was not able to find any suitable pointer to explain how to do
> >>> that, so I
> >>> blindly tried several combinations but I am afraid to interact with the
> >>> other netlink protocols when using a multicast group, especially when
> >>> there
> >>> are other applications like avahi-daemon or "ip monitor all".
> >>>
> >>> Does anyone have a pointer to a documentation (not the redhat one,
> >>> pls), or
> >>> some clues ?
> 
> There's also a paper/doc here:
>   http://people.redhat.com/nhorman/papers/netlink.pdf
> 
Apologies that its still not finished.  I've been trying to get that done
forever.

Neil

> -- 
> ~Randy
> LPC 2009, Sept. 23-25, Portland, Oregon
> http://linuxplumbersconf.org/2009/
> --
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