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Date: Thu, 6 May 2004 13:58:54 -0500
From: "Jacques A. Vidrine" <nectar@FreeBSD.org>
To: Andre Oppermann <andre@FreeBSD.org>
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References: <200405061846.i46Ik3Jc060969@repoman.freebsd.org>
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Subject: Re: cvs commit: src/sys/netinet ip_fastfwd.c ip_input.c ip_var.h
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On Thu, May 06, 2004 at 11:46:03AM -0700, Andre Oppermann wrote:
> andre       2004/05/06 11:46:03 PDT
> 
>   FreeBSD src repository
> 
>   Modified files:
>     sys/netinet          ip_fastfwd.c ip_input.c ip_var.h 
>   Log:
>   Provide the sysctl net.inet.ip.process_options to control the processing
>   of IP options.
>   
>    net.inet.ip.process_options=0  Ignore IP options and pass packets unmodified.
>    net.inet.ip.process_options=1  Process all IP options (default).
>    net.inet.ip.process_options=2  Reject all packets with IP options with ICMP
>     filter prohibited message.
>   
>   This sysctl affects packets destined for the local host as well as those
>   only transiting through the host (routing).
>   
>   IP options do not have any legitimate purpose anymore and are only used
>   to circumvent firewalls or to exploit certain behaviours or bugs in TCP/IP
>   stacks.
>   
>   Reviewed by:    sam (mentor)

Yay!
Shall we have the default be `2 Reject all packets with IP options...' ?
I think so.

Cheers,
-- 
Jacques Vidrine / nectar@celabo.org / jvidrine@verio.net / nectar@freebsd.org