netdev - [PATCH RFCv3 0/4] batman-adv: Unicasting multicast reports to querier-node only

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Date:	Tue,  7 Apr 2015 21:57:28 +0200
From:	Linus Lüssing <linus.luessing@...3.blue>
To:	b.a.t.m.a.n@...ts.open-mesh.org, netdev@...r.kernel.org,
	bridge@...ts.linux-foundation.org
Subject: [PATCH RFCv3 0/4] batman-adv: Unicasting multicast reports to
 querier-node only

The last round of multicast patches send to the batman-adv mailinglist
to add support for the multicast optimizations in bridged scenarios, too,
unfortunately had one major conceptual flaw: It could lead to packet loss.
It's not sufficient to have the unicasting of reports implemented on
bridge-nodes only. Nodes without bridges need to treat reports the same
way.

The issue is described in detail here:

https://www.open-mesh.org/projects/batman-adv/wiki/Multicast-optimizations-listener-reports

I'd also be interested in what the netdev/bridge people think about
patches #1 and #2 in particular, therefore including the according mailinglists
now.

Cheers, Linus

-----

Changelog:
v3:
 * Adding Kconfig-depends and #if's
   (so basically adding similar dependancy constraints as the bridge code
    has, except that there are no depends if batman-adv gets compiled without
    multicast optimizations)
   -> the case of IPv6=M and batman-adv=y is still impossible if multicast
      optimizations are enabled; but I don't see the practical demand for that
      either - people who use IPv6 as a module will probably also want to
      use batman-adv as a module
v2:
 * various bugfixes (now runtime tested, too - should(tm) work)
 * added netdev+bridge mailinglists
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