Route export problem with FreeBSD 13.0

[David S.]

Hello,

Please try this patch:

https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224258&action=diff
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255089

Thank you.

Best regards,
David S.
------------------------------------------------
e. david at zeromail.us
w. pnyet.web.id
p. 087881216110


On Sun, Aug 29, 2021 at 5:07 PM Alexander V. Chernikov <melifaro at ipfw.ru>
wrote:

>
> > On 28 Aug 2021, at 15:23, Luiz Amaral <email at luiz.eng.br> wrote:
> >
> > Hello guys,
> Hi Luiz,
>
> >
> > After upgrading one of my hosts from FreeBSD 12.2 to FreeBSD 13.0, I
> > started noticing a problem when exporting routes to the KRT.
> Unfortunately, there were a number of issues in 13.0 w.r.t rtsock handling.
> I’d suggest considering updating to 13-STABLE.
> >
> > My logs were getting flooded with "kernel: gw sdl_len too small". This
> > message comes from cleanup_xaddrs_gateway() in sys/net/rtsock.c of
> > releng/13.0, so I checked with "route monitor" and noticed that the
> > blackhole routes and one interface route were the ones causing the
> message.
> >
> > got message of size 192 on Sat Aug 28 15:57:32 2021
> > RTM_ADD: Add Route: len 192, pid: 2293, seq 3, errno 22,
> > flags:<UP,BLACKHOLE,PROTO1>
> > locks:  inits:
> > sockaddrs: <DST,GATEWAY,NETMASK>
> >  10.0.0.0 link#4 255.0.0.0
> >
> > got message of size 192 on Sat Aug 28 15:57:32 2021
> > RTM_ADD: Add Route: len 192, pid: 2293, seq 4, errno 22,
> flags:<UP,PROTO1>
> > locks:  inits:
> > sockaddrs: <DST,GATEWAY,NETMASK>
> >  10.42.10.0 link#5 255.255.255.0
> >
> > In BIRD they look the same as before the upgrade:
> >
> > bird> show route all 10.0.0.0/8
> > Table master4:
> > 10.0.0.0/8           blackhole [s_null_4 2021-08-28 15:57:32] ! (200)
> >         Type: static univ
> > bird> show route all 10.42.10.0/24
> > Table master4:
> > 10.42.10.0/24        unicast [direct1 2021-08-28 16:07:59] ! (240)
> >         dev vlan10
> >         Type: device univ
> >
> >
> > I then decided to try manually adding a blackhole route using "route add
> > -net 10.0.0.0/8 -blackhole -proto1 -nostatic", to get as close to what
> > BIRD was trying to add and noticed that BIRD had a gateway, but "route
> > add" didn't have one.
> >
> > got message of size 184 on Sat Aug 28 16:05:43 2021
> > RTM_ADD: Add Route: len 184, pid: 2766, seq 1, errno 0,
> > flags:<UP,GATEWAY,DONE,BLACKHOLE,PROTO1>
> > locks:  inits:
> > sockaddrs: <DST,NETMASK>
> >  10.0.0.0 255.0.0.0
> >
> > I tried commenting out line 324 in sysdep/bsd/krt-sock.c of v2.0.8 to
> > see if that could fix it and bird was able to insert the blackhole route
> > (can be seen below), but then bird started dying a couple seconds after
> > starting up, with no error showing up on the logs.
> >
> > got message of size 184 on Sat Aug 28 15:27:33 2021
> > RTM_ADD: Add Route: len 184, pid: 46425, seq 2, errno 22,
> flags:<UP,PROTO1>
> > locks:  inits:
> > sockaddrs: <DST,NETMASK>
> >  10.42.10.0 255.255.255.0
> >
> > got message of size 184 on Sat Aug 28 15:27:33 2021
> > RTM_ADD: Add Route: len 184, pid: 46425, seq 3, errno 0,
> > flags:<UP,GATEWAY,DONE,BLACKHOLE,PROTO1>
> > locks:  inits:
> > sockaddrs: <DST,NETMASK>
> >  10.0.0.0 255.0.0.0
> >
> >
> > At this point, I ran out of ideas on what else to try. This is in a
> > testing environment, so I can easily try things out or provide extra
> > information.
> >
> > Thank you,
> > Luiz
> >
> >
> >
>
>
>
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