From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Subject: Re: [PATCH conntrack-tools 1/2] conntrackd: restrict multicast reception
Date: Mon, 10 Nov 2025 13:35:55 +0100 [thread overview]
Message-ID: <aRHcK0reHpFVExYi@calendula> (raw)
In-Reply-To: <20251110103531.2158-1-pablo@netfilter.org>
On Mon, Nov 10, 2025 at 11:35:30AM +0100, Pablo Neira Ayuso wrote:
> - For IPv4, bind multicast socket to the address specified by
> IPv4_interface to restrict the interface.
>
> - For IPv6, bind the multicast socket to the IPv6 multicast address.
> Although interface_index6 already restricts the interface, binding to
> inaddr_any still allows for IPv4 sync messages to be received.
>
> Without this patch, multicast sync messages can be received from any
> address if your firewall policy does not restrict the interface used for
> sending and receiving them.
This patch breaks communication between nodes, scratch that.
prev parent reply other threads:[~2025-11-10 12:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-10 10:35 [PATCH conntrack-tools 1/2] conntrackd: restrict multicast reception Pablo Neira Ayuso
2025-11-10 10:35 ` [PATCH conntrack-tools 2/2] conntrackd: remove double close() in multicast resulting in EBADFD Pablo Neira Ayuso
2025-11-10 12:35 ` Pablo Neira Ayuso [this message]
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