netdev - Re: [RFC] bridge: allow passing link-local multicast

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <CAEJpZP2FGhPmTi0+eS+QRhj4y+aqfQHnEUrjmOOLHUay1SuAKg@mail.gmail.com>
Date:	Thu, 18 Aug 2011 16:52:45 +0100
From:	Nick Carter <ncarter100@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Ed Swierk <eswierk@...switch.com>, netdev@...r.kernel.org,
	David Lamparter <equinox@...c24.net>,
	bridge@...ux-foundation.org
Subject: Re: [RFC] bridge: allow passing link-local multicast

On 18 August 2011 16:10, Stephen Hemminger <shemminger@...tta.com> wrote:
> On Thu, 18 Aug 2011 16:06:19 +0100
> Nick Carter <ncarter100@...il.com> wrote:
>
>> Why can't we use the 802.1D specified STP group address to identify ?
>> The existing code uses that address.
>> I know you said on another thread that there are people using other addresses.
>> Who are these people ?
>> Are they following any standard ?
>> What address / address range are they using ?
>
> The group address can be reprogrammed, and it is settable on other
> routing equipment. People do it to create spanning tree domains.
>
But before the new
+               if (!is_stp_bpdu(skb) && br_forward_link_local)
check, we have already checked
	if (unlikely(is_link_local(dest))) {
So the frame must have a link local destination.  If the reprogrammed
group address is outside of the link local range then the new code in
this patch will never be hit.  If the reprogrammed group address is in
the link local range then i'd suggest my previous group_fwd_mask patch
is cleaner and more flexible.

Nick
--
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