netdev - Re: [PATCH net-next] netlink: support dumping IPv4 multicast addresses

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Message-ID: <CANn89iJsO=FppY=qx6Mo5CUP6v5QgeR-c4StSGmCoQ3kcZ-bEg@mail.gmail.com>
Date: Tue, 17 Dec 2024 08:07:46 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Yuyang Huang <yuyanghuang@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, David Ahern <dsahern@...nel.org>, 
	roopa@...ulusnetworks.com, jiri@...nulli.us, stephen@...workplumber.org, 
	jimictw@...gle.com, prohr@...gle.com, liuhangbin@...il.com, 
	nicolas.dichtel@...nd.com, andrew@...n.ch, netdev@...r.kernel.org, 
	Maciej Żenczykowski <maze@...gle.com>, 
	Lorenzo Colitti <lorenzo@...gle.com>
Subject: Re: [PATCH net-next] netlink: support dumping IPv4 multicast addresses

On Tue, Dec 17, 2024 at 7:31 AM Yuyang Huang <yuyanghuang@...gle.com> wrote:
>
> Extended RTM_GETMULTICAST to support dumping joined IPv4 multicast
> addresses, in addition to the existing IPv6 functionality. This allows
> userspace applications to retrieve both IPv4 and IPv6 multicast
> addresses through similar netlink command and then monitor future
> changes by registering to RTNLGRP_IPV4_MCADDR and RTNLGRP_IPV6_MCADDR.

Hi Yuyang

Have you tested your patch with LOCKDEP enabled ?

CONFIG_PROVE_LOCKING=y

I think this should splat, considering your use of for_each_pmc_rtnl()
in a section where rtnl is not held.

Please make sure to use RCU variant only in the dump operation.