rfc3514 - Security Flag in the IPv4 Header

[Mike Hoskins]

On Wed, 2 Apr 2003, David Pick wrote:
> > Any chance this is an April Fool's joke?

Yes.

> The idea is sound and brilliant in concept.

It was a joke. :)

> > Inquiring minds see a real snakepit involved in applications
> > setting and honoring a bit that conveys dishonorable
> > intentions.   /-:

Exactly, as if people wouldn't 'fiddle' with the bit.

> I think it's unfortunate that someone as well respected as
> Stephen Bellovin should fall prey to an obvious trap. One

He didn't.  :)  Funny, this got sucked into *BSD and Linux CVS
repositories, and discussed on a number of mailing lists.

>From bmanning at karoshi.com Wed Apr  2 22:45:56 2003
Date: Tue, 1 Apr 2003 09:40:26 -0800 (PST)
From: bmanning at karoshi.com
To: nanog at nanog.org
Subject: Re: RFC3514
> Well, you weren't taking it seriously, I hope. lol
> -Jack
Subject: cvs commit: src/sbin/ping ping.8 ping.c src/share/man/man4
         inet.4 ip.4 src/sys/netinet in.h in_pcb.h ip.h ip_input.c
         ip_output.c ip_var.h src/usr.bin/netstat inet.c
Date: Tue, 1 Apr 2003 00:21:44 -0800 (PST)
To: src-committers at FreeBSD.org, cvs-src at FreeBSD.org,
    cvs-all at FreeBSD.org

mdodd       2003/04/01 00:21:44 PST

  FreeBSD src repository

  Modified files:
    sbin/ping            ping.8 ping.c
    share/man/man4       inet.4 ip.4
    sys/netinet          in.h in_pcb.h ip.h ip_input.c ip_output.c
                         ip_var.h
    usr.bin/netstat      inet.c
  Log:
  Implement support for RFC 3514 (The Security Flag in the IPv4 Header).
  (See: ftp://ftp.rfc-editor.org/in-notes/rfc3514.txt)

  This fulfills the host requirements for userland support by
  way of the setsockopt() IP_EVIL_INTENT message.

  There are three sysctl tunables provided to govern system behavior.

          net.inet.ip.rfc3514:

                  Enables support for rfc3514.  As this is an
                  Informational RFC and support is not yet widespread
                  this option is disabled by default.

          net.inet.ip.hear_no_evil

                   If set the host will discard all received evil packets.

          net.inet.ip.speak_no_evil

                  If set the host will discard all transmitted evil packets.

  The IP statistics counter 'ips_evil' (available via 'netstat') provides
  information on the number of 'evil' packets recieved.

  For reference, the '-E' option to 'ping' has been provided to demonstrate
  and test the implementation.

  Revision  Changes    Path
  1.47      +4 -2      src/sbin/ping/ping.8
  1.92      +13 -1     src/sbin/ping/ping.c
  1.21      +11 -0     src/share/man/man4/inet.4
  1.29      +9 -0      src/share/man/man4/ip.4
  1.75      +2 -0      src/sys/netinet/in.h
  1.59      +1 -0      src/sys/netinet/in_pcb.h
  1.22      +1 -0      src/sys/netinet/ip.h
  1.232     +14 -0     src/sys/netinet/ip_input.c
  1.181     +28 -1     src/sys/netinet/ip_output.c
  1.72      +1 -0      src/sys/netinet/ip_var.h
  1.57      +1 -0      src/usr.bin/netstat/inet.c

----- End forwarded message:


-mrh

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