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From: Michael Tuexen <tuexen@FreeBSD.org>
Date: Wed, 25 May 2016 15:54:21 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r300687 - head/sys/netinet
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Author: tuexen
Date: Wed May 25 15:54:21 2016
New Revision: 300687
URL: https://svnweb.freebsd.org/changeset/base/300687

Log:
  Send an ICMP packet indicating destination unreachable/protocol
  unreachable if we don't handle the packet in the kernel and not
  in userspace.
  
  MFC after:	1 week

Modified:
  head/sys/netinet/raw_ip.c

Modified: head/sys/netinet/raw_ip.c
==============================================================================
--- head/sys/netinet/raw_ip.c	Wed May 25 15:49:29 2016	(r300686)
+++ head/sys/netinet/raw_ip.c	Wed May 25 15:54:21 2016	(r300687)
@@ -71,6 +71,7 @@ __FBSDID("$FreeBSD$");
 #include <netinet/ip.h>
 #include <netinet/ip_var.h>
 #include <netinet/ip_mroute.h>
+#include <netinet/ip_icmp.h>
 
 #ifdef IPSEC
 #include <netipsec/ipsec.h>
@@ -416,8 +417,10 @@ rip_input(struct mbuf **mp, int *offp, i
 		if (inetsw[ip_protox[ip->ip_p]].pr_input == rip_input) {
 			IPSTAT_INC(ips_noproto);
 			IPSTAT_DEC(ips_delivered);
+			icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, 0);
+		} else {
+			m_freem(m);
 		}
-		m_freem(m);
 	}
 	return (IPPROTO_DONE);
 }