[PATCH] Netlink on FreeBSD support

[Alexander Chernikov]

> On 17 Dec 2022, at 16:06, Ondrej Zajicek <santiago at crfreenet.org> wrote:
> 
> On Sat, Dec 17, 2022 at 01:27:23PM +0000, Alexander Chernikov wrote:
>>>> * 0002-FreeBSD-use-interface-index-instead-of-IP-address-wh.patch switches multicast interface specification from ip address to interface index. That allows to avoid iface->sysdep value, which is not filled by netlink.
>>> 
>>> Nice. Is this supported since long ago, or does it require some recent BSD version?
>>> Do you know whether it is supported also in other BSD flavors?
>> 
>> It’s a bit complicated :-)
>> 
>> FreeBSD:
>> IP_MULTICAST_IF - ip_mreqn support was added in [1] @ 2007.
>> IP_<ADD|DEL>_MEMBERSHIP - ip_mreqn support was added in [2] @ 2019 / FreeBSD 12.1. All currently supported FreeBSD versions have this functionality in place
>> 
>> OpenBSD:
>> IP_MULTICAST_IF - ip_mreqn support was added in [3] @ 2021
>> IP_<ADD|DEL>_MEMBERSHIP - ip_mreqn support was added in [4] @ 2021
>> 
>> NetBSD:
>> IP_MULTICAST_IF,  IP_<ADD|DEL>_MEMBERSHIP uses old API hack, treating 0/8 IPv4 addresses as ifindex. It was added in [5] @ 2001
> 
> Thanks for the overview!
> 
> So we can assume that the ip_mreqn API is available since FreeBSD 12.1
> and OpenBSD 6.9 and enable CONFIG_USE_IP_MREQN based on __FreeBSD_version
It’s certainly correct for FreeBSD (_FreeBSD_version >= 1201000)
> and OpenBSD version macros?
Probably.

> 
> I generally prefer to keep old system compatibility code for ~ 5 years,
> although it makes more sense on Linux, where are some LTS distributions
> with similar long-term commitments, than on BSD.
Yep, that makes great sense.
> 
> -- 
> Elen sila lumenn' omentielvo
> 
> Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
> "To err is human -- to blame it on a computer is even more so."

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