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Date:      Sat, 07 Apr 2018 08:17:29 +0000
From:      "Poul-Henning Kamp" <phk@phk.freebsd.dk>
To:        Roman Bogorodskiy <novel@FreeBSD.org>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: Getting /dev entry by interface name
Message-ID:  <37078.1523089049@critter.freebsd.dk>
In-Reply-To: <20180407025807.GA18883@kloomba>
References:  <20180407025807.GA18883@kloomba>

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In message <20180407025807.GA18883@kloomba>, Roman Bogorodskiy writes:

>1. Create tap(4) like that:
>
># ifconfig tap create
>tap2
>#
>
>2. Rename it
>
># ifconfig tap2 name testif
>testif
>
>Now I can do 'ifconfig testif' and there'll be no signs that it was
>named 'tap2' previously, however, in /dev it's still /dev/tap2.

I would argue that is an error.

The /dev entry should also be renamed, or maybe better, a symlink
with the new name should be created, pointing to the /dev/tap%d
entry.

However, I dont know if that is actually possible, is the device
driver even even told about the new interface name ?

There is also a name-space validation issue to think about:

	ifconfig tap2 name ../etc

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.



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