linux-kernel - Re: [PATCH v3 6/7] netlink: Add multicast group level permissions

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Message-ID: <20230330233941.70c98715@kernel.org>
Date:   Thu, 30 Mar 2023 23:39:41 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Anjali Kulkarni <anjali.k.kulkarni@...cle.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        zbr@...emap.net, brauner@...nel.org, johannes@...solutions.net,
        ecree.xilinx@...il.com, leon@...nel.org, keescook@...omium.org,
        socketcan@...tkopp.net, petrm@...dia.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 6/7] netlink: Add multicast group level permissions

On Wed, 29 Mar 2023 11:25:42 -0700 Anjali Kulkarni wrote:
> A new field perm_groups is added in netlink_sock to store the protocol's
> multicast group access permissions. This is to allow for a more fine
> grained access control than just at the protocol level. These
> permissions can be supplied by the protocol via the netlink_kernel_cfg.
> A new function netlink_multicast_allowed() is added, which checks if
> the protocol's multicast group has non-root access before allowing bind.

Is there a reason this is better than implementing .bind
in the connector family and filtering there?