netdev - Re: [patch net-next] devlink: don't allow to change net namespace for FW

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Date:   Mon, 13 Feb 2023 11:45:16 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Simon Horman <simon.horman@...igine.com>
Cc:     Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, moshe@...dia.com
Subject: Re: [patch net-next] devlink: don't allow to change net namespace
 for FW_ACTIVATE reload action

Sat, Feb 11, 2023 at 02:23:28PM CET, simon.horman@...igine.com wrote:
>On Fri, Feb 10, 2023 at 11:43:04AM -0800, Jacob Keller wrote:
>> 
>> 
>> On 2/10/2023 5:15 AM, Simon Horman wrote:
>> > On Fri, Feb 10, 2023 at 12:58:27PM +0100, Jiri Pirko wrote:
>> >> From: Jiri Pirko <jiri@...dia.com>
>> >>
>> >> The change on network namespace only makes sense during re-init reload
>> >> action. For FW activation it is not applicable. So check if user passed
>> >> an ATTR indicating network namespace change request and forbid it.
>> >>
>> >> Fixes: ccdf07219da6 ("devlink: Add reload action option to devlink reload command")
>> >> Signed-off-by: Jiri Pirko <jiri@...dia.com>
>> >> ---
>> >> Sending to net-next as this is not actually fixing any real bug,
>> >> it just adds a forgotten check.
>> >> ---
>> >>  net/devlink/dev.c | 5 +++++
>> >>  1 file changed, 5 insertions(+)
>> >>
>> >> diff --git a/net/devlink/dev.c b/net/devlink/dev.c
>> >> index 78d824eda5ec..a6a2bcded723 100644
>> >> --- a/net/devlink/dev.c
>> >> +++ b/net/devlink/dev.c
>> >> @@ -474,6 +474,11 @@ int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)
>> >>  	if (info->attrs[DEVLINK_ATTR_NETNS_PID] ||
>> >>  	    info->attrs[DEVLINK_ATTR_NETNS_FD] ||
>> >>  	    info->attrs[DEVLINK_ATTR_NETNS_ID]) {
>> >> +		if (action != DEVLINK_RELOAD_ACTION_DRIVER_REINIT) {
>> >> +			NL_SET_ERR_MSG_MOD(info->extack,
>> >> +					   "Changing namespace is only supported for reinit action");
>> >> +			return -EOPNOTSUPP;
>> >> +		}
>> > 
>> > Is this also applicable in the case where the requested ns (dest_net)
>> > is the same as the current ns, which I think means that the ns
>> > is not changed?
>> > 
>> 
>> In that case wouldn't userspace simply not add the attribute though?
>
>Yes, that may be the case.
>But my question is about the correct behaviour if user space doesn't do that.

Okay. Will send v2.