*** if_loop.c.virgin	Sun Jun 23 02:51:48 1996
--- if_loop.c	Sun Jun 23 02:52:07 1996
***************
*** 37,42 ****
--- 37,49 ----
  #include <vax/mtpr.h>
  #endif
  
+ #include "bpfilter.h"
+ #if NBPFILTER > 0
+ #include <sys/time.h>
+ #include <net/bpf.h>
+ static caddr_t lo_bpf;
+ #endif
+ 
  #define	LOMTU	(1024+512)
  
  struct	ifnet loif;
***************
*** 65,70 ****
--- 72,80 ----
  	ifp->if_flags |= IFF_UP;
  #endif BERK
  	ifp->if_flags |= IFF_RUNNING;
+ #if NBPFILTER > 0
+ 	bpfattach(&lo_bpf, ifp, DLT_NULL, sizeof(u_int));
+ #endif
  }
  
  looutput(ifp, m0, dst)
***************
*** 93,98 ****
--- 103,114 ----
  		m->m_next = m0;
  		m0 = m;
  	}
+ #if NBPFILTER > 0
+ 	if (lo_bpf) {
+ 		*(mtod(m0, u_int *)) = dst->sa_family;
+ 		bpf_mtap(lo_bpf, m0);
+ 	}
+ #endif
  	*(mtod(m0, struct ifnet **)) = ifp;
  	s = splimp();
  	ifp->if_opackets++;