kern/112612: [lo] Traffic via additional lo(4) interface shows up on lo0 in bpf(4)

[Cristian KLEIN]

The following reply was made to PR kern/112612; it has been noted by GNATS.

From: Cristian KLEIN <cristi at net.utcluj.ro>
To: bug-followup at FreeBSD.org,  yar at comp.chem.msu.su
Cc:  
Subject: Re: kern/112612: [lo] Traffic via additional lo(4) interface shows
 up on lo0 in bpf(4)
Date: Mon, 16 Jul 2007 17:18:33 +0300

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 The following patch is against -CURRENT:
 
 cd /usr/src
 patch < if_loop.patch
 
 Recompile the kernel and it should work.
 
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  filename="if_loop.patch"
 
 --- sys/net/if_loop.c.orig	2007-02-09 02:09:35.000000000 +0200
 +++ sys/net/if_loop.c	2007-07-16 17:02:31.438464106 +0300
 @@ -274,15 +274,15 @@
  			bpf_mtap(ifp->if_bpf, m);
  		}
  	} else {
 -		if (bpf_peers_present(loif->if_bpf)) {
 -			if ((m->m_flags & M_MCAST) == 0 || loif == ifp) {
 +		if (bpf_peers_present(ifp->if_bpf)) {
 +			if ((m->m_flags & M_MCAST) == 0 || (ifp->if_flags == IFF_LOOPBACK)) {
  				/* XXX beware sizeof(af) != 4 */
  				u_int32_t af1 = af;	
  
  				/*
  				 * We need to prepend the address family.
  				 */
 -				bpf_mtap2(loif->if_bpf, &af1, sizeof(af1), m);
 +				bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
  			}
  		}
  	}
 
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