Re: Bidirectional Forwarding Detection

[yar]

Hello Olivier.

Thanks for the detailed answer.

I meant something like this:
https://www.bsdcan.org/2016/schedule/events/667.en.html
https://www.bsdcan.org/2016/schedule/attachments/358_bsdcan2016-bfd.pdf

On Mon, 4 Dec 2017, 15:41, you wrote:


On Mon, Dec 4, 2017 at 1:53 PM, yar  wrote:


Hello All.

Does FreeBSD support BFD (Bidirectional Forwarding Detection)?
rfc5880, rfc5881



​Hi,

BFD is supported (ie: not filtered) by FreeBSD: you just need to use a BFD
daemon software.

If your question was "Does FreeBSD includes a BFD daemon into base?", the
answer is no.

Main usage of BFD is to detect network failure between routing peers and
give this information to the routing protocol​.
As example, once an OSPF process detect new neighbours, it will sent their
IP addresses to the BFD process:
Once received, the BFD process will monitor the reachability of these
neighbours and will communicate back to the OSPF process if they are not
reachable.

But I'm not aware of a standard way for an "independent" bfd daemon to
communicate between all the routing softwares (bird, FRR, quagga, etc.):
This is why they includes their own BFD daemon (like bird).

Regards,

Olivier



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yar
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[Bug 223824] Kernel panic in ng_base.c (netgraph)

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223824

Kubilay Kocak  changed:

   What|Removed |Added

 Status|New |Open
Summary|[arm64] Kernel panic in |Kernel panic in ng_base.c
   |ng_base.c (netgraph)|(netgraph)
  Flags||mfc-stable10?,
   ||mfc-stable11?
   Keywords||crash, needs-qa

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[Bug 206185] [netgraph][patch] refactoring ng_patch

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206185

Kubilay Kocak  changed:

   What|Removed |Added

   Assignee|freebsd-net@FreeBSD.org |jul...@freebsd.org
  Flags||mfc-stable10+,
   ||mfc-stable11+
 Status|New |In Progress

--- Comment #6 from Kubilay Kocak  ---
Mark and classify to track what occurred. Assign to committer resolving.

What left to do to resolve/close?

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[Bug 223824] [arm64] Kernel panic in ng_base.c (netgraph)

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223824

Eugene Grosbein  changed:

   What|Removed |Added

  Flags|mfc-stable10?,  |mfc-stable10-,
   |mfc-stable11?   |mfc-stable11-
Summary|Kernel panic in ng_base.c   |[arm64] Kernel panic in
   |(netgraph)  |ng_base.c (netgraph)

--- Comment #7 from Eugene Grosbein  ---
This issue is ARM-specific as it does not manifest for other platforms. ARM is
not FreeBSD Tier1 platform yet, so MFC is not important for this.

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[Bug 224061] IpV6 SCTP - sctp_sendv() from client does not work

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224061

Michael Tuexen  changed:

   What|Removed |Added

 CC||tue...@freebsd.org
   Assignee|freebsd-net@FreeBSD.org |tue...@freebsd.org

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Bidirectional Forwarding Detection

[yar]

Hello All.

Does FreeBSD support BFD (Bidirectional Forwarding Detection)?
rfc5880, rfc5881

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yar
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Re: Netmap ouch double free

[Martina Balintova]

Hi Vincenzo,

Thank you for pointing me in right direction. Yes indeed, those were
overflow buffers that did the trick. I did not point them back before
closing.
(I am using linux).

Martina



On Dec 3, 2017 08:56, "Vincenzo Maffione"  wrote:

> Hi,
>   It may be related to the "extra buffers feature" of netmap, that lb uses.
> When the netmap port is opened, some additional buffers (not bound to any
> netmap ring) are allocated to be used by the application for slot swapping.
> They are provided through the ni_bufs_head field as a linked list (see
> updated netmap manual https://github.com/luigirizzo/
> netmap/blob/master/share/man/man4/netmap.4 ).
> To free them, the free list must be returned when closing the netmap file
> descriptor, using the same ni_bufs_head field.
>
> To check if this is true you could make sure that you are using "-B 0"
> option, which means no extra buffers are used.
>
> Are you using the latest netmap code from github? Are you using FreeBSD or
> Linux?
>
> Cheers,
>   Vincenzo
>
> 2017-12-01 15:21 GMT+01:00 Martina Balintova :
>
>> Hi,
>> I am currently playing with lb app in netmap. Every time I kill/close it,
>> the app hangs for some time and does not end immediately. In syslogs I am
>> getting:
>> '
>> Netmap_do_unregif   deleting last instance for myapp{1
>> Netmap_do_deref active=5
>> Netnap_obj_free   ouch, double free on buffer 2
>> Netmap_extra_free   freed 0 buffers
>> '
>>
>> This happens when I have some consumer on the pipe and at some point
>> during
>> whole lb lifetime, it did not consume all packets (resulting in oq being
>> filled or packets being dropped). If the pipe did not ever have a
>> consumer,
>> then it will not end up in the double free.
>> I am finding it quite hard to debug in gdb, as this is happening at the
>> shutdown.
>> Could someone pls point me to reason?
>>
>> I am running lb with one interface and 2 groups, different numb of pipes
>> per group and this happens even with no  extra buffers.
>>
>> Martina
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>
>
>
> --
> Vincenzo Maffione
>
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Re: Bidirectional Forwarding Detection

[Olivier Cochard-Labbé]

On Mon, Dec 4, 2017 at 1:53 PM, yar  wrote:

> Hello All.
>
> Does FreeBSD support BFD (Bidirectional Forwarding Detection)?
> rfc5880, rfc5881


​Hi,

BFD is supported (ie: not filtered) by FreeBSD: you just need to use a BFD
daemon software.

If your question was "Does FreeBSD includes a BFD daemon into base?", the
answer is no.

Main usage of BFD is to detect network failure between routing peers and
give this information to the routing protocol​.
As example, once an OSPF process detect new neighbours, it will sent their
IP addresses to the BFD process:
Once received, the BFD process will monitor the reachability of these
neighbours and will communicate back to the OSPF process if they are not
reachable.

But I'm not aware of a standard way for an "independent" bfd daemon to
communicate between all the routing softwares (bird, FRR, quagga, etc.):
This is why they includes their own BFD daemon (like bird).

Regards,

Olivier
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