Date: Fri, 08 Nov 2019 16:55:11 -0600 From: Mike Karels <mike@karels.net> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD as multicast router Message-ID: <201911082255.xA8MtBq3079126@mail.karels.net> In-Reply-To: Your message of Fri, 08 Nov 2019 15:03:45 %2B0000. <6F37B324-17FB-49EE-BA22-0BC78BA2C3EC@lists.zabbadoz.net>
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> On 8 Nov 2019, at 7:30, Mike Karels wrote: > >> P.S. I rebuild kernel with MROUTING option but > >> ===== > >> # netstat -gs -f inet > >> No IPv4 MROUTING kernel support > >> ===== > > > >> still here > > > > Oh, I see; that's another manifestation of the bug that makes netstat > > fail with the loadable module. It doesn't work if VNET is defined, > > because then there isn't a single stats structure with the expected > > name. My fixed netstat would work. Let me know what FreeBSD version > > you are running, and I can build a fixed version; or I can send a > > patch. > How did you fix netstat? > The proper way to fix this seems to be to stop using lkvm for querying > the stats and properly exporting them in the kernel. They are already exported via sysctl, and fetched that way on a live system. But netstat was stupidly insisting that _mrtstats have a value in the namelist first. That is not true if ip_mroute was loaded as a module, and also if VNET was defined. The fix is not to complain or quit unless sysctl fails, or if operating on a core file and _mrtstat is not found. When I'm happy with the patch, I'll put it in review. I haven't checked yet how other functions deal with VNET (if at all) in a core file. Mike
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