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From: "Andrey V. Elsukov" <ae@FreeBSD.org>
Date: Wed, 3 Aug 2011 04:27:47 +0000 (UTC)
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Subject: svn commit: r224622 - stable/8/sys/netinet
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Author: ae
Date: Wed Aug  3 04:27:47 2011
New Revision: 224622
URL: http://svn.freebsd.org/changeset/base/224622

Log:
  MFC r223753:
    ARP code reuses mbuf from ARP request to make a reply, but it does not
    reset rcvif to NULL. Since rcvif is not NULL, ipfw(4) supposes that ARP
    replies were received on specified interface.
    Reset rcvif to NULL for ARP replies to fix this issue.
  
    PR:		kern/131817

Modified:
  stable/8/sys/netinet/if_ether.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/netinet/if_ether.c
==============================================================================
--- stable/8/sys/netinet/if_ether.c	Wed Aug  3 03:52:15 2011	(r224621)
+++ stable/8/sys/netinet/if_ether.c	Wed Aug  3 04:27:47 2011	(r224622)
@@ -843,6 +843,7 @@ reply:
 	ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */
 	m->m_len = sizeof(*ah) + (2 * ah->ar_pln) + (2 * ah->ar_hln);   
 	m->m_pkthdr.len = m->m_len;   
+	m->m_pkthdr.rcvif = NULL;
 	sa.sa_family = AF_ARP;
 	sa.sa_len = 2;
 	(*ifp->if_output)(ifp, m, &sa, NULL);