SIOCGIFCONF and AF_AX25

SIOCGIFCONF and AF_AX25

[Roland Schwarz]

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Using ioctl SIOCGIFCONF one was able to list all interfaces, including 
AF_AX25.

This seems to be not be the case any more. I discovered it by trying to 
find out why N1UROs axdigi stopped working.

Is this a bug, or is there some other means how the interfaces can be 
enumerated?

73 roland, oe1rsa

-- 
__________________________________________
   _  _  | Roland Schwarz
  |_)(_  |
  | \__) | mailto:roland.schwarz@blackspace.at
________| http://www.blackspace.at

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Re: SIOCGIFCONF and AF_AX25

[Dan Carpenter]

On Sun, Jan 16, 2022 at 05:54:53PM +0100, Roland Schwarz wrote:
> Using ioctl SIOCGIFCONF one was able to list all interfaces, including
> AF_AX25.
> 
> This seems to be not be the case any more. I discovered it by trying to find
> out why N1UROs axdigi stopped working.
> 
> Is this a bug, or is there some other means how the interfaces can be
> enumerated?

In the kernel, the rule is "you're not allowed to break userspace".
What that means is that you can change the User facing API so long as
people don't notice and/or complain.  Since you are complaining that
means it is a bug.

Can you use git bisect to find out which patch broke this?

regards,
dan carpenter

Re: SIOCGIFCONF and AF_AX25

[Roland Schwarz]

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On 17.01.22 at 14:51 wrote Dan Carpenter:
> Can you use git bisect to find out which patch broke this?

Thank you for coming back. It seems however there is no bug. I was 
expecting that N1URO's axdigi would work on plain AX25 ports, i.e. such 
that have no IP address assigned. It turns out, that as soon as I assign 
IP addresses the interfaces are enumerated as expected.

So it is not a kernel bug, and not likely a bug at all, probably only 
lacking documentation (or my inability to find it).

73 Roland

-- 
__________________________________________
   _  _  | Roland Schwarz
  |_)(_  |
  | \__) | mailto:roland.schwarz@blackspace.at
________| http://www.blackspace.at

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