Date: Mon, 16 Aug 1999 18:58:11 -0400 (EDT) From: Bosko Milekic <bmilekic@dsuper.net> To: lists@idle.za.org Cc: freebsd-hackers@freebsd.org Subject: Re: Raw Packet code containing security bits Message-ID: <Pine.OSF.4.05.9908161829490.6210-100000@oracle.dsuper.net>
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Hello Andrew,
When filling your struct ip *iphead, try replacing:
iphead->ip_len = htons(length);
with:
iphead->ip_len = length;
or, for portability reasons, you may want to do something like:
#ifdef LINUX || OpenBSD21
#define BO(x) htons(x)
#else
#define BO(x) (x)
#endif
And, when filling the ip packet length, do a: iphead->ip_len = BO(length);
This is a byte-order issue that has often caused confusion for Linux
people...
/usr/include/machine/endian.h provides some insight...
/Bosko.
> I wonder if anyone here could perhaps of be assistance, Im currently
> playing with implementing certain things in trusted bsd to do with ip
> security classes and how the system responds to security bits, and
> implementing certain things the stack etc. However my first piece of
> test
> code playing with raw packets to test how things respond to packets with
> the security bit set, doesnt seem to want to work. This code compiles
> fine, however when I try and run it it says invalid argument when it
> tries
> to send the packet. If anyone could give me any insight as to why this
> code doesnt run properly, it would be much appreciated, and would
> certainly help me in my efforts to continue expanding trusted bsd.
>
> Ive included the code below...
>
> Thanks
> Andrew
[snipped]
<----- - - . .
Bosko Milekic <bmilekic@dsuper.net> http://www.dsuper.net/~bmilekic/
Network Operations - Delphi SuperNet, an Internet Direct company
+1.514.281.7500 (vox) / +1.514.281.6599 (fax) / http://www.dsuper.net/
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