All of lore.kernel.org
 help / color / mirror / Atom feed
From: Walter Karshat <wkarshat@yahoo.com>
To: lartc@vger.kernel.org
Subject: [LARTC] offset mask usage in u32 filter
Date: Sat, 16 Aug 2003 04:52:35 +0000	[thread overview]
Message-ID: <marc-lartc-106100961629949@msgid-missing> (raw)

iproute2 distribution in README.iproute2+tc includes
toward the end an example of usage of syntax 'offset
mask' as follows:

# Lookup hash table, if it is not fragmented frame
# Use protocol as hash key
$TC filter add dev eth1 parent 1:0 prio 5 handle ::1
u32 ht 800:: \
	match ip nofrag \
	offset mask 0x0F00 shift 6 \
	hashkey mask 0x00ff0000 at 8 \
	link 1:

Also, identical usage is shown in an example in Linux
- Advanced Networking Overview:
http://qos.ittc.ku.edu/howto/node48.html

I could find no explanation of this usage in LARTC,
and specifically, Section 12.4 on Hashing filters does
not use it.  Searches of the mailing list did not
yield an answer.  Review of tc code in f_u32.c showed
that in parse_offset() the arguments were assembled
into tc_u32_sel structure fields and passed into the
kernel.  However, I could not figure out what the
intent was in cls_u32.c for these fields.

I would much appreciate an explanation or pointers to
information.
  Walter

__________________________________
Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software
http://sitebuilder.yahoo.com
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

                 reply	other threads:[~2003-08-16  4:52 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=marc-lartc-106100961629949@msgid-missing \
    --to=wkarshat@yahoo.com \
    --cc=lartc@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.