netdev - Re: [PATCH net-next v2] genetlink: Use internal flags for multicast groups

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Date: Thu, 21 Dec 2023 18:29:28 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Ido Schimmel <idosch@...dia.com>
Cc: netdev@...r.kernel.org, mptcp@...ts.linux.dev, davem@...emloft.net,
	kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
	nhorman@...driver.com, matttbe@...nel.org, martineau@...nel.org,
	yotam.gi@...il.com, jiri@...nulli.us, jacob.e.keller@...el.com,
	johannes@...solutions.net, fw@...len.de
Subject: Re: [PATCH net-next v2] genetlink: Use internal flags for multicast
 groups

On Wed, Dec 20, 2023 at 05:43:58PM +0200, Ido Schimmel wrote:
> As explained in commit e03781879a0d ("drop_monitor: Require
> 'CAP_SYS_ADMIN' when joining "events" group"), the "flags" field in the
> multicast group structure reuses uAPI flags despite the field not being
> exposed to user space. This makes it impossible to extend its use
> without adding new uAPI flags, which is inappropriate for internal
> kernel checks.
> 
> Solve this by adding internal flags (i.e., "GENL_MCAST_*") and convert
> the existing users to use them instead of the uAPI flags.
> 
> Tested using the reproducers in commit 44ec98ea5ea9 ("psample: Require
> 'CAP_NET_ADMIN' when joining "packets" group") and commit e03781879a0d
> ("drop_monitor: Require 'CAP_SYS_ADMIN' when joining "events" group").
> 
> No functional changes intended.

FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

-- 
With Best Regards,
Andy Shevchenko