From 86fd58c179c55c61f1f10045ae3b9c755ad820b0 Mon Sep 17 00:00:00 2001
From: joerg <joerg@FreeBSD.org>
Date: Tue, 20 May 1997 22:54:04 +0000
Subject: [PATCH] Major nit: i've confused link0 and link1 in my brain and/or
 in either the man page or the source file.  Fix this.

Minor problem: don't choke with ENETDOWN early.  As long as our output
queue has space, put the IP packets there even if IPCP ain't up yet.
We will eventually be able delivering them once the PPP state machine
came up.
---
 sys/net/if_spppsubr.c | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

diff --git a/sys/net/if_spppsubr.c b/sys/net/if_spppsubr.c
index 5b10f3acf0aa..6c425a835344 100644
--- a/sys/net/if_spppsubr.c
+++ b/sys/net/if_spppsubr.c
@@ -17,7 +17,7 @@
  *
  * From: Version 1.9, Wed Oct  4 18:58:15 MSK 1995
  *
- * $Id: if_spppsubr.c,v 1.18 1997/05/11 10:04:24 joerg Exp $
+ * $Id: if_spppsubr.c,v 1.19 1997/05/19 22:03:09 joerg Exp $
  */
 
 #include <sys/param.h>
@@ -65,17 +65,17 @@
 /*
  * Interface flags that can be set in an ifconfig command.
  *
- * Setting link0 will cause the link to auto-dial only as packets
- * arrive to be sent.
- *
- * Setting link1 will make the link passive, i.e. it will be marked
+ * Setting link0 will make the link passive, i.e. it will be marked
  * as being administrative openable, but won't be opened to begin
  * with.  Incoming calls will be answered, or subsequent calls with
  * -link1 will cause the administrative open of the LCP layer.
+ *
+ * Setting link1 will cause the link to auto-dial only as packets
+ * arrive to be sent.
  */
 
-#define IFF_AUTO	IFF_LINK0	/* auto-dial on output */
-#define IFF_PASSIVE	IFF_LINK1	/* wait passively for connection */
+#define IFF_PASSIVE	IFF_LINK0	/* wait passively for connection */
+#define IFF_AUTO	IFF_LINK1	/* auto-dial on output */
 
 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
 #define PPP_UI          0x03            /* Unnumbered Information */
@@ -483,7 +483,7 @@ sppp_output(struct ifnet *ifp, struct mbuf *m,
 	struct sppp *sp = (struct sppp*) ifp;
 	struct ppp_header *h;
 	struct ifqueue *ifq;
-	int s;
+	int s, rv = 0;
 
 	s = splimp();
 
@@ -551,13 +551,19 @@ sppp_output(struct ifnet *ifp, struct mbuf *m,
 	case AF_INET:   /* Internet Protocol */
 		if (sp->pp_flags & PP_CISCO)
 			h->protocol = htons (ETHERTYPE_IP);
-		else if (sp->state[IDX_IPCP] == STATE_OPENED)
-			h->protocol = htons (PPP_IP);
 		else {
-			m_freem (m);
-			++ifp->if_oerrors;
-			splx (s);
-			return (ENETDOWN);
+			/*
+			 * Don't choke with an ENETDOWN early.  It's
+			 * possible that we just started dialing out,
+			 * so don't drop the packet immediately.  If
+			 * we notice that we run out of buffer space
+			 * below, we will however remember that we are
+			 * not ready to carry IP packets, and return
+			 * ENETDOWN, as opposed to ENOBUFS.
+			 */
+			h->protocol = htons(PPP_IP);
+			if (sp->state[IDX_IPCP] != STATE_OPENED)
+				rv = ENETDOWN;
 		}
 		break;
 #endif
@@ -597,7 +603,7 @@ sppp_output(struct ifnet *ifp, struct mbuf *m,
 		m_freem (m);
 		++ifp->if_oerrors;
 		splx (s);
-		return (ENOBUFS);
+		return (rv? rv: ENOBUFS);
 	}
 	IF_ENQUEUE (ifq, m);
 	if (! (ifp->if_flags & IFF_OACTIVE))