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From: "Andrey V. Elsukov" <ae@FreeBSD.org>
Date: Tue, 7 Jun 2011 06:42:29 +0000 (UTC)
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Subject: svn commit: r222806 - head/sys/netinet/ipfw
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Author: ae
Date: Tue Jun  7 06:42:29 2011
New Revision: 222806
URL: http://svn.freebsd.org/changeset/base/222806

Log:
  Make a behaviour of the libalias based in-kernel NAT a bit closer to
  how natd(8) does work. natd(8) drops packets only when libalias returns
  PKT_ALIAS_IGNORED and "deny_incoming" option is set, but ipfw_nat
  always did drop packets that were not aliased, even if they should
  not be aliased and just are going through.
  
  PR:		kern/122109, kern/129093, kern/157379
  Submitted by:	Alexander V. Chernikov (previous version)
  MFC after:	1 month

Modified:
  head/sys/netinet/ipfw/ip_fw_nat.c

Modified: head/sys/netinet/ipfw/ip_fw_nat.c
==============================================================================
--- head/sys/netinet/ipfw/ip_fw_nat.c	Tue Jun  7 06:18:02 2011	(r222805)
+++ head/sys/netinet/ipfw/ip_fw_nat.c	Tue Jun  7 06:42:29 2011	(r222806)
@@ -262,17 +262,27 @@ ipfw_nat(struct ip_fw_args *args, struct
 	else
 		retval = LibAliasOut(t->lib, c,
 			mcl->m_len + M_TRAILINGSPACE(mcl));
-	if (retval == PKT_ALIAS_RESPOND) {
-		m->m_flags |= M_SKIP_FIREWALL;
-		retval = PKT_ALIAS_OK;
-	}
-	if (retval != PKT_ALIAS_OK &&
-	    retval != PKT_ALIAS_FOUND_HEADER_FRAGMENT) {
+
+	/*
+	 * We drop packet when:
+	 * 1. libalias returns PKT_ALIAS_ERROR;
+	 * 2. For incoming packets:
+	 *	a) for unresolved fragments;
+	 *	b) libalias returns PKT_ALIAS_IGNORED and
+	 *		PKT_ALIAS_DENY_INCOMING flag is set.
+	 */
+	if (retval == PKT_ALIAS_ERROR ||
+	    (args->oif == NULL && (retval == PKT_ALIAS_UNRESOLVED_FRAGMENT ||
+	    (retval == PKT_ALIAS_IGNORED &&
+	    (t->lib->packetAliasMode & PKT_ALIAS_DENY_INCOMING) != 0)))) {
 		/* XXX - should i add some logging? */
 		m_free(mcl);
 		args->m = NULL;
 		return (IP_FW_DENY);
 	}
+
+	if (retval == PKT_ALIAS_RESPOND)
+		m->m_flags |= M_SKIP_FIREWALL;
 	mcl->m_pkthdr.len = mcl->m_len = ntohs(ip->ip_len);
 
 	/*