Date: Wed, 06 Jun 2001 23:16:57 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: hackers@FreeBSD.ORG Subject: Re: cloning network interfaces Message-ID: <85874.991862217@critter> In-Reply-To: Your message of "Wed, 06 Jun 2001 14:12:28 PDT." <20010606141228.A13639@Odin.AC.HMC.Edu>
next in thread | previous in thread | raw e-mail | index | archive | help
In message <20010606141228.A13639@Odin.AC.HMC.Edu>, Brooks Davis writes:
>With network devices that are also normal devices the way tun is,
>you do this by just implementing a dev_clone event handler so when the
>user attempts to open a non-existent instance it's created. The problem
>with gif is that there's no device in /dev to open. Since most network
>devices at attached to hardware this usually doesn't matter, but in this
>case it does.
>
>[...]
>
>How would this work anyway?
>
>Comments, thoughts, ideas?
The quick and dirty way:
Make a clone handler despite the fact that there is no /dev
entry needed. You don't actually have to create a dev entry
in the clone handler, you could just create the gif_interface.
Applications would then:
stat("/dev/gif345") /* Ignore error */
system("ifconfig gif345 bla bla bla");
The slower but less dirty:
Make a sysctl which returns an integer which is the next
free gif device.
The really slow and very dirty:
Implement cloning in ifconfig.
--
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.
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?85874.991862217>