Raw AF_INET ICMP sockets

[Mike Muuss]

As the comment on the front of PING.C says, it depends on
your having installed various fixes to your kernel.
Most importantly, you have to change /sys/netinet/in_proto.c:

Remove:
< { 0,		PF_INET,	IPPROTO_ICMP,	0,
<   icmp_input,	0,		0,		0,
<   0,
<   0,		0,		0,		0,
< },

At the end of the protosw table, add:
> { SOCK_RAW,	PF_INET,	IPPROTO_ICMP,	PR_ATOMIC|PR_ADDR,
>   icmp_input,	rip_output,	0,		0,
>   raw_usrreq,
>   0,		0,		0,		0,
> },

This will be enough to get you started.  There are bugs in
ip_input.c as well;  contact me by electronic mail if you
need these changes too;  they are too numerous to post here.

Best,
 -Mike Muuss

(301)-278-6678
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Postal:
  Mike Muuss
  Leader, Advanced Computer Systems Team
  Computer Science and Mathematics Branch
  Systems Engineering and Concepts Analysis Division
  U.S. Army Ballistic Research Laboratory
  Attn: AMXBR-SECAD (Muuss)
  APG, MD  21005