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Date:      Sun, 19 Feb 2012 20:15:13 +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: r231916 - stable/8/sys/netinet
Message-ID:  <201202192015.q1JKFDJu013233@svn.freebsd.org>
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Author: tuexen
Date: Sun Feb 19 20:15:13 2012
New Revision: 231916
URL: http://svn.freebsd.org/changeset/base/231916

Log:
  MFC 231672:
  
  Fix a bug where the wrong protocol overhead was used. This can lead
  to a deadlock of an association when an IPv6 socket was used to
  communicate with IPv4 and an ICMPv4 fragmentation needed message
  was received.
  While there, simplify the code a bit.
  
  Approved by: re@

Modified:
  stable/8/sys/netinet/sctp_output.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_output.c
==============================================================================
--- stable/8/sys/netinet/sctp_output.c	Sun Feb 19 18:16:42 2012	(r231915)
+++ stable/8/sys/netinet/sctp_output.c	Sun Feb 19 20:15:13 2012	(r231916)
@@ -7612,16 +7612,22 @@ sctp_fill_outqueue(struct sctp_tcb *stcb
 
 	SCTP_TCB_LOCK_ASSERT(stcb);
 	asoc = &stcb->asoc;
+	switch (net->ro._l_addr.sa.sa_family) {
+#ifdef INET
+	case AF_INET:
+		goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
+		break;
+#endif
 #ifdef INET6
-	if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
+	case AF_INET6:
 		goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
-	} else {
-		/* ?? not sure what else to do */
-		goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
-	}
-#else
-	goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
+		break;
 #endif
+	default:
+		/* TSNH */
+		goal_mtu = net->mtu;
+		break;
+	}
 	/* Need an allowance for the data chunk header too */
 	goal_mtu -= sizeof(struct sctp_data_chunk);
 
@@ -8180,10 +8186,21 @@ again_one_more_time:
 					if (!no_out_cnt)
 						*num_out += ctl_cnt;
 					/* recalc a clean slate and setup */
-					if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
-						mtu = (net->mtu - SCTP_MIN_OVERHEAD);
-					} else {
-						mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
+					switch (net->ro._l_addr.sa.sa_family) {
+#ifdef INET
+					case AF_INET:
+						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
+						break;
+#endif
+#ifdef INET6
+					case AF_INET6:
+						mtu = net->mtu - SCTP_MIN_OVERHEAD;
+						break;
+#endif
+					default:
+						/* TSNH */
+						mtu = net->mtu;
+						break;
 					}
 					to_out = 0;
 					no_fragmentflg = 1;
@@ -8446,10 +8463,21 @@ again_one_more_time:
 					if (!no_out_cnt)
 						*num_out += ctl_cnt;
 					/* recalc a clean slate and setup */
-					if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
-						mtu = (net->mtu - SCTP_MIN_OVERHEAD);
-					} else {
-						mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
+					switch (net->ro._l_addr.sa.sa_family) {
+#ifdef INET
+					case AF_INET:
+						mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
+						break;
+#endif
+#ifdef INET6
+					case AF_INET6:
+						mtu = net->mtu - SCTP_MIN_OVERHEAD;
+						break;
+#endif
+					default:
+						/* TSNH */
+						mtu = net->mtu;
+						break;
 					}
 					to_out = 0;
 					no_fragmentflg = 1;
@@ -9492,10 +9520,21 @@ sctp_chunk_retransmission(struct sctp_in
 		}
 		/* pick up the net */
 		net = chk->whoTo;
-		if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
-			mtu = (net->mtu - SCTP_MIN_OVERHEAD);
-		} else {
+		switch (net->ro._l_addr.sa.sa_family) {
+#ifdef INET
+		case AF_INET:
 			mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
+			break;
+#endif
+#ifdef INET6
+		case AF_INET6:
+			mtu = net->mtu - SCTP_MIN_OVERHEAD;
+			break;
+#endif
+		default:
+			/* TSNH */
+			mtu = net->mtu;
+			break;
 		}
 
 		if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
@@ -9816,12 +9855,10 @@ one_chunk_around:
 	return (0);
 }
 
-
-static int
+static void
 sctp_timer_validation(struct sctp_inpcb *inp,
     struct sctp_tcb *stcb,
-    struct sctp_association *asoc,
-    int ret)
+    struct sctp_association *asoc)
 {
 	struct sctp_nets *net;
 
@@ -9829,7 +9866,7 @@ sctp_timer_validation(struct sctp_inpcb 
 	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 		if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 			/* Here is a timer */
-			return (ret);
+			return;
 		}
 	}
 	SCTP_TCB_LOCK_ASSERT(stcb);
@@ -9840,7 +9877,7 @@ sctp_timer_validation(struct sctp_inpcb 
 	} else {
 		sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
 	}
-	return (ret);
+	return;
 }
 
 void
@@ -9950,7 +9987,7 @@ sctp_chunk_output(struct sctp_inpcb *inp
 #ifdef SCTP_AUDITING_ENABLED
 			sctp_auditing(8, inp, stcb, NULL);
 #endif
-			(void)sctp_timer_validation(inp, stcb, asoc, ret);
+			sctp_timer_validation(inp, stcb, asoc);
 			return;
 		}
 		if (ret < 0) {

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