netdev - Re: [RFC PATCH net] vxlan: fix incorrect RCO bit in VXLAN header

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]

Date:	Fri, 4 Dec 2015 08:43:59 -0800
From:	Tom Herbert <tom@...bertland.com>
To:	Jiri Benc <jbenc@...hat.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Thomas Graf <tgraf@...g.ch>, Tom Herbert <therbert@...gle.com>
Subject: Re: [RFC PATCH net] vxlan: fix incorrect RCO bit in VXLAN header

On Fri, Dec 4, 2015 at 4:54 AM, Jiri Benc <jbenc@...hat.com> wrote:
> Commit 3511494ce2f3d ("vxlan: Group Policy extension") changed definition of
> VXLAN_HF_RCO from 0x00200000 to BIT(24). This is obviously incorrect. It's
> also in violation with the RFC draft.
>
> Fixes: 3511494ce2f3d ("vxlan: Group Policy extension")
> Cc: Thomas Graf <tgraf@...g.ch>
> Cc: Tom Herbert <therbert@...gle.com>
> Signed-off-by: Jiri Benc <jbenc@...hat.com>
> ---
> This code is, unfortunately, in the tree since 4.0. Not sure whether we can
> change it now. On the other hand, we're in violation with the RFC draft and
> collide with VXLAN-GPE flags assignment which defines this bit as OAM flag.
>
> Opinions welcome, especially by Tom and Thomas.

Thanks Jiri!

What a mess VXLAN has become. There are no guidelines or order in
defining these reserved bits! If anyone is looking to do some work in
encapsulation please consider bringing up VXLAN-GPE/NSH in the stack,
hopefully that world will be better....

Acked-by: Tom Herbert <tom@...bertland.com>

> ---
>  include/net/vxlan.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/net/vxlan.h b/include/net/vxlan.h
> index c1c899c3a51b..e289ada6adf6 100644
> --- a/include/net/vxlan.h
> +++ b/include/net/vxlan.h
> @@ -79,7 +79,7 @@ struct vxlanhdr {
>  };
>
>  /* VXLAN header flags. */
> -#define VXLAN_HF_RCO BIT(24)
> +#define VXLAN_HF_RCO BIT(21)
>  #define VXLAN_HF_VNI BIT(27)
>  #define VXLAN_HF_GBP BIT(31)
>
> --
> 1.8.3.1
>
> --
> 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
--
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