Re: git: 7e5bf68495cc - main - netlink: add netlink support

From: Gleb Smirnoff <>
Date: Wed, 15 Mar 2023 20:05:47 UTC
On Thu, Mar 09, 2023 at 05:45:50PM +0000, Alexander Chernikov wrote:
A> > So, really fun thing here, we also have #define NETLINK_GENERIC 0 in sys/net/if_mib.h. (And that’s exposed to userspace, and used there, so we can’t just change that.)
A> > 
A> Wow. Thanks for pointing it out - it wasn’t defined in the kernel headers so I missed it.
A> That looks like something FreeBSD-specific. Both NetBSD / OpenBSD doesn’t have it.
A> It seem to provide:
A> - iteration over the list of the interfaces
A> - some basic interface traffic statistics
A> - copy of the ’struct ifdata’ (basic interface properties and some interface traffic statistics)
A> - Link-specific data (IFDATA_LINKSPECIFIC), not used by anything in base
A> - Original “driver name” (IFDATA_DRIVERNAME)
A> Most of this is already provided by either getifaddr(3) or netlink or even rtsock. I’m thinking of deprecating it in mid-term in favour of Netlink.
A> I see the following options:
A> 1) Remove usage of if_mib.h from ifconfig
A> 2) Add compat layer:
A> *) Rename NETLINK_GENERIC to NET_LINK_GENERIC (which is the right name de-facto)
A> *) Add conditional define for NETLINK_GENERIC to if_mib and set it to 16
A> *) Define another tree in if_mib.c under <>.generic16 with value 16

Let's request exp-run with NETLINK_GENERIC removed or renamed to NET_LINK_GENERIC.
Very likely deprecating this name would go fairly easy.

Gleb Smirnoff