On 28/12/17 1:37 am, John Lyon wrote:
Julian,
Unfortunately, this issue remains unresolved. I would like to think
that this is just a PEBKAC issue, but I have tried every permutation
of escape characters in case it's an issue with my syntax and I get
the same set of errors. No matter what I do, I can't connect the no
match hook of an ETF node to the upper hook of an ng_ether node. Do
you have any insights into why this might be occurring?
By the way, thanks for reaching out to me! I was going to email you
directly after the holidays since your name and email address are at
the bottom of the relevant Netgraph man pages. I figured that must
mean if you didn't know the answer, no one does. :-)
what is EAP?
what about return EAP packets? (are there any?)
I think this is what you want:
$ sudo ngctl list
There are 7 total nodes:
Name: igb0 Type: ether ID: 00000001 Num hooks: 0
Name: igb1 Type: ether ID: 00000002 Num hooks: 0
Name: ix0 Type: ether ID: 00000003 Num hooks: 0
Name: ix1 Type: ether ID: 00000004 Num hooks: 0
Name: tap0 Type: ether ID: 00000005 Num hooks: 0
Name: bridge3 Type: ether ID: 00000006 Num hooks: 0
Name: ngctl7372 Type: socket ID: 00000007 Num hooks: 0
$ sudo kldload ng_etf
$ sudo ngctl name ix0:lower eapfilter
$ sudo ngctl connect eapfilter: ix0: nomatch upper
$ sudo ngctl connect eapfilter: ix1: eapout lower
$ sudo ngctl show eapfilter:
Name: eapfilter Type: etf ID: 00000021 Num hooks: 3
Local hook Peer name Peer type Peer ID Peer hook
---------- --------- --------- ------- ---------
eapout ix1 ether 00000004 lower
nomatch ix0 ether 00000003 upper
downstream ix0 ether 00000003 lower
$ sudo ngctl msg eapfilter: 'setfilter { matchhook="eapout"
ethertype=0x888e }'
$
Thanks.
--------------------------------
John L. Lyon
PGP Key Available At:
https://www.dropbox.com/s/skmedtscs0tgex7/02150BFE.asc
On Wed, Dec 27, 2017 at 10:32 AM, Julian Elischer
<jul...@freebsd.org <mailto:jul...@freebsd.org>> wrote:
John did you get a resolution to this issue?
On 16/12/17 2:59 am, John Lyon wrote:
Harry and Eugene (and others),
I appreciate all of your help. It's been really
insightful. Although I
feel like I'm getting much closer to the solution, I don't
think my problem
has been diagnosed. I've outlined my thought process
below. Can you
please tell me if I am misunderstanding something?
Admittedly, I am not a
kernel developer and my C language skills have atrophied the
last few
years. However, I've reviewed my script and I looked in the
code for
ng_etf.c and I don't think I am violating any of the
requirements for
linking a hook for no match.
As Eugene stated:
1) referenced "matchook" exists and you should not
use "indirect name"
here,
only hook own name, or else you get error ENOENT (No
such file or
directory);
This does not seem to be a problem as the upper and lower
hooks for the em1
already exist (I can confirm this).
2) referenced "matchook" is *not* downstream hook,
or else you get error
EINVAL (Invalid argument);
I read the ng_etf.c file in the source tree and found this
little snippet:
/* and is not the downstream hook */
if (hook == etfp->downstream_hook.hook) {
error = EINVAL;
break;
}
This appears to be an error check to make sure you are not
creating a cycle
in the graph by referencing the ETF node's own downstream
hook (i.e.
filtering incoming traffic and circularly feeding
non-matching frames back
into the ETF's own filter). I'm not doing this. I am
feeding non-matching
packets into the *lower* hook of another ether node and not
back into the
*downstream* hook of the etf node I am creating. As a
result, my netgraph
should not be triggering this error condition.
3) it was not already configured, or else you get
error EEXIST (File
exists).
I am not getting this error, so it appears not to be an
issue in my case.
What am I missing here? The man page states that "*any
other *hook" can be
used for the non-matching packets. So the man page says
this should work,
and there's no explicit error condition that I see (caveat,
I have not
written in C for at least 10 years - PEBKAC is entirely
possible) that
would be triggered in the ng_etf code. So what is going wrong?
Thanks for all of your help, patience, and understanding.
--------------------------------
John L. Lyon
PGP Key Available At:
https://www.dropbox.com/s/skmedtscs0tgex7/02150BFE.asc
<https://www.dropbox.com/s/skmedtscs0tgex7/02150BFE.asc>
On Fri, Dec 15, 2017 at 3:48 AM, Harry Schmalzbauer
<free...@omnilan.de <mailto:free...@omnilan.de>>
wrote:
Bezüglich Eugene Grosbein's Nachricht vom 14.12.2017
23:07 (localtime):
15.12.2017 4:27, John Lyon wrote:
I'm a new Netgraph user, but am having
some problems with a simple
Netgraph
script I have written. Unfortunately,
the error message is cryptic
and I
can't tell what I am doing wrong since
my script closely follows the
example provided in the ng_etf man page.
For some context, I'm trying to filter
EAP traffic coming in on my LAN
interface. Any ethernet frames that
correspond to EAP traffic need
to be
immediately forwarded from the LAN
interface to my WAN interface. All
other ethernet frames coming in on my
LAN interface need to be
handled by
the kernel's network stack. A (horrid)
ASCII art representation of my
desired netgraph would look like this:
lower -> em0 -> downstream -> ETF -> no
match -> upper em0
-> match ->
lower em1
The script I have written is this:
#! /bin/sh
ngctl mkpeer em0: etf lower downstream
ngctl name em0:lower lan_filter
ngctl connect em0: lan_filter:
upper nomatch
ngctl msg lan_filter: setfilter {
matchhook="em1:lower"
ethertype=0x888e }
Unfortunately, the last line of my
script generates the following
error
message:
ngctl: send msg: Invalid Argument
For "setfilter" command to work, ng_etf requires that:
1) referenced "matchook" exists and you should not
use "indirect name"
here,
only hook own name, or else you get error ENOENT (No
such file or
directory);
2) referenced "matchook" is *not* downstream hook,
or else you get error
EINVAL (Invalid argument);
3) it was not already configured, or else you get
error EEXIST (File
exists).
Eugene kindly looked into the code and found that the
error is due to
wrong matchhook definition.
I've never had any contact with ng_etf yet, but
according to the man
page, you need to set the (additional) filter hook by
'nghook -a
lan_filter: mydrain' and use 'matchhook=mydrain' for the
'msg' command.
Do idea about the intention, so for the rest you have to
tweak as needed.
-harry
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