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Date:      Fri, 10 Feb 2012 23:38:38 +0000 (UTC)
From:      Michael Tuexen <tuexen@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org
Subject:   svn commit: r231478 - stable/8/sys/netinet
Message-ID:  <201202102338.q1ANccVm002356@svn.freebsd.org>

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Author: tuexen
Date: Fri Feb 10 23:38:38 2012
New Revision: 231478
URL: http://svn.freebsd.org/changeset/base/231478

Log:
  MFC r227540:
  Set the MTU of an path to an approriate value if the interface MTU
  can't be determined.

Modified:
  stable/8/sys/netinet/sctp_pcb.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/boot/   (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)
  stable/8/sys/dev/e1000/   (props changed)

Modified: stable/8/sys/netinet/sctp_pcb.c
==============================================================================
--- stable/8/sys/netinet/sctp_pcb.c	Fri Feb 10 23:36:33 2012	(r231477)
+++ stable/8/sys/netinet/sctp_pcb.c	Fri Feb 10 23:38:38 2012	(r231478)
@@ -4064,13 +4064,8 @@ sctp_add_remote_addr(struct sctp_tcb *st
 		/* Now get the interface MTU */
 		if (net->ro._s_addr && net->ro._s_addr->ifn_p) {
 			net->mtu = SCTP_GATHER_MTU_FROM_INTFC(net->ro._s_addr->ifn_p);
-		} else {
-			net->mtu = 0;
 		}
-		if (net->mtu == 0) {
-			/* Huh ?? */
-			net->mtu = SCTP_DEFAULT_MTU;
-		} else {
+		if (net->mtu > 0) {
 			uint32_t rmtu;
 
 			rmtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, net->ro.ro_rt);
@@ -4090,11 +4085,31 @@ sctp_add_remote_addr(struct sctp_tcb *st
 				net->mtu = rmtu;
 			}
 		}
-		if (from == SCTP_ALLOC_ASOC) {
-			stcb->asoc.smallest_mtu = net->mtu;
+	}
+	if (net->mtu == 0) {
+		switch (newaddr->sa_family) {
+#ifdef INET
+		case AF_INET:
+			net->mtu = SCTP_DEFAULT_MTU;
+			break;
+#endif
+#ifdef INET6
+		case AF_INET6:
+			net->mtu = 1280;
+			break;
+#endif
+		default:
+			break;
 		}
-	} else {
-		net->mtu = stcb->asoc.smallest_mtu;
+	}
+	if (net->port) {
+		net->mtu -= (uint32_t) sizeof(struct udphdr);
+	}
+	if (from == SCTP_ALLOC_ASOC) {
+		stcb->asoc.smallest_mtu = net->mtu;
+	}
+	if (stcb->asoc.smallest_mtu > net->mtu) {
+		stcb->asoc.smallest_mtu = net->mtu;
 	}
 #ifdef INET6
 	if (newaddr->sa_family == AF_INET6) {
@@ -4104,12 +4119,7 @@ sctp_add_remote_addr(struct sctp_tcb *st
 		(void)sa6_recoverscope(sin6);
 	}
 #endif
-	if (net->port) {
-		net->mtu -= sizeof(struct udphdr);
-	}
-	if (stcb->asoc.smallest_mtu > net->mtu) {
-		stcb->asoc.smallest_mtu = net->mtu;
-	}
+
 	/* JRS - Use the congestion control given in the CC module */
 	if (stcb->asoc.cc_functions.sctp_set_initial_cc_param != NULL)
 		(*stcb->asoc.cc_functions.sctp_set_initial_cc_param) (stcb, net);



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