netdev - Re: [PATCH net-next 2/2] vxlan: Eliminate dependency on UDP socket in transmit path

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: <CA+mtBx9p0hXP=f4pCTASM_7RXfP8t2qkGQ34iQ7-vuCq1sMAWQ@mail.gmail.com>
Date:	Tue, 20 Jan 2015 14:53:33 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/2] vxlan: Eliminate dependency on UDP socket in
 transmit path

On Tue, Jan 20, 2015 at 10:13 AM, Thomas Graf <tgraf@...g.ch> wrote:
> On 01/20/15 at 09:29am, Tom Herbert wrote:
>> I didn't see any reason to preclude that, if it needs to be symmetric
>> in that case it can be forced at the configuration. Being able to
>> receive RCO but not have to send it to certain peers is important use
>> case. You may want to consider this also for GBP if there are cases
>> where we accept GBP from different peers, but only send it to certain
>> ones.
>
> I think asymmetric configurations are fine, in particular
> receive-only. I was reluctant to the send-only scenario initially
> as I would expect a VTEP sending RCO frames on UDP dport 8472 to
> also always be able to accept RCO frames on that port. I can't
> come up with any specific cases where this would lead to problems
> though so I have no objections.
>
> As for GBP, as processing of the policy group requires additional
> iptables or OVS rules anyway, such behaviour would be implemented
> in those rules by either ignoring the mark or dropping such frames.

It's risky from a protocol perspective to assume that sending
something will be properly ignored. Just because we're willing to
receive something, doesn't mean we necessarily want to send it--
that's the robustness principle :-)
--
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