netdev - [HOWTO?] packet: tx-only socket / binding to "nothing"?

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Message-ID: <20190726154548.GC258193@eidolon.nox.tf>
Date:   Fri, 26 Jul 2019 17:45:48 +0200
From:   David Lamparter <equinox@...c24.net>
To:     netdev@...r.kernel.org
Subject: [HOWTO?] packet: tx-only socket / binding to "nothing"?

Hi netdev,

quick question: is there a recommended setup to get a send-only packet
socket?  I've been reading net/packet/af_packet.c up and down and don't
see an explicit way, so I ended up binding to ("lo", ETH_P_LOOP)
instead.  (Nothing special about ETH_P_LOOP, I just grabbed a random
value that looked like it might never happen.)

Cheers,

-David