RFC#1812 directed broadcast compliant patch for FreeBSD 2.2.1R

*** sys/i386/conf/GENERIC.orig	Fri Jun 13 18:42:46 1997
--- src/sys/i386/conf/GENERIC	Fri Jun 13 18:43:00 1997
***************
*** 29,34 ****
--- 29,35 ----
  options		"CD9660"		#ISO 9660 Filesystem
  options		PROCFS			#Process filesystem
  options		"COMPAT_43"		#Compatible with BSD 4.3 [KEEP THIS!]
+ #options		DIRECTED_BROADCAST	#Broadcast across subnets
  options		SCSI_DELAY=15		#Be pessimistic about Joe SCSI device
  options		BOUNCE_BUFFERS		#include support for DMA bounce buffers
  options		UCONSOLE		#Allow users to grab the console

*** sys/netinet/ip_input.c.orig	Fri Jun 13 11:16:48 1997
--- sys/netinet/ip_input.c	Fri Jun 13 18:40:33 1997
***************
*** 365,371 ****
  
  		if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr)
  			goto ours;
! 		if (ia->ia_ifp && ia->ia_ifp->if_flags & IFF_BROADCAST) {
  			if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
  			    ip->ip_dst.s_addr)
  				goto ours;
--- 365,375 ----
  
  		if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr)
  			goto ours;
! 		if (ia->ia_ifp && ia->ia_ifp->if_flags & IFF_BROADCAST
! #ifdef DIRECTED_BROADCAST
! 		 && ia->ia_ifp == m->m_pkthdr.rcvif
! #endif
! 						) {
  			if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
  			    ip->ip_dst.s_addr)
  				goto ours;
***************
*** 1270,1275 ****
--- 1274,1282 ----
  	}
  
  	error = ip_output(m, (struct mbuf *)0, &ipforward_rt, 
+ #ifdef DIRECTED_BROADCAST
+ 			IP_ALLOWBROADCAST |
+ #endif
  			  IP_FORWARDING, 0);
  	if (error)
  		ipstat.ips_cantforward++;