netdev - bride: IPv6 multicast snooping enhancements

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1378253619-23918-1-git-send-email-linus.luessing@web.de>
Date:	Wed,  4 Sep 2013 02:13:37 +0200
From:	Linus Lüssing <linus.luessing@....de>
To:	netdev@...r.kernel.org
Cc:	bridge@...ts.linux-foundation.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Cong Wang <amwang@...hat.com>,
	Adam Baker <linux@...er-net.org.uk>,
	Linus Lüssing <linus.luessing@....de>
Subject: bride: IPv6 multicast snooping enhancements

Hi,

Here are two, small feature changes I would like to submit to increase
the usefulness of the multicast snooping of the bridge code.

The first patch is an unaltered one I had submitted before, but since it
got no feedback I'm resubmitting it here for net-next. With the recently
added patch to disable snooping if there is no querier (b00589af + 248ba8ec05
+ 8d50af4fb), it should be a safe choice now (without these, patch 1/2 would
have introduced another potential for lost IPv6 multicast packets).

Both conceptually and also with some testing and fuzzing, I couldn't spot
any more causes for potential packet loss. And since the multicast snooping
code has now been tried by various people, I think it should be a safe
choice to apply the multicast snooping not only for IPv6 multicast packets
with a scope greater than link-local, but also for packets of exactly this
scope. The IPv6 standard mandates MLD reports for link-local multicast, too,
so we can safely snoop them as well (in contrast to IPv4 link-local).

Cheers, Linus

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html