Added stub interface. (Interface which is propagated to OSPF but

it does not sends nor listens packets.)

I added some new options, please look at it and look into doc if it's OK.

doc/bird.sgml

@@ -1014,6 +1014,7 @@ protocol ospf <name> {
 		interface <interface pattern>
 		{
 			cost <num>;
+			stub <switch>;
 			hello <num>;
 			poll <num>;
 			retransmit <num>;
@@ -1060,6 +1061,10 @@ protocol ospf <name> {
 	<tag>cost <M>num</M></tag>
 	 Specifies output cost (metric) of an interface. Default value is 10.
 
+	<tag>stub <M>switch</M></tag>
+	 If set to interface it does not listen to any packet and does not send
+	 any hello. Default value is no.
+
 	<tag>hello <M>num</M></tag>
 	 Specifies interval in seconds between sending of Hello messages. Beware, all
 	 routers on the same network need to have the same hello interval.
@@ -1093,13 +1098,17 @@ protocol ospf &lt;name&gt; {
 	 convenient to force use of a different type manually.
 	 On broadcast networks, flooding and Hello messages are sent using multicasts (a single packet for all the neighbors).
 
+	<tag>type pointopoint</tag>
+	 Point-to-point networks connect just 2 routers together. No election
+	 is performed there which reduces the number of messages sent.
+
 	<tag>type nonbroadcast</tag>
 	 On nonbroadcast networks, the packets are sent to each neighbor
 	 separately because of lack of multicast capabilities.
 
-	<tag>type pointopoint</tag>
-	 Point-to-point networks connect just 2 routers together. No election
-	 is performed there which reduces the number of messages sent.
+	<tag>strict nonbroadcast <M>switch</M></tag>
+	 If set, don't send hello to any undefined neighbor. This switch
+	 is ignored on on any non-NBMA network. Default is No.
 
 	<tag>authentication none</tag>
 	 No passwords are sent in OSPF packets. This is the default value.
@@ -1116,10 +1125,6 @@ protocol ospf &lt;name&gt; {
 	 A set of neighbors to which Hello messages on nonbroadcast networks
 	 are to be sent. Some of them could be marked as eligible.
 
-	<tag>strict nonbroadcast <M>switch</M></tag>
-	 If set, don't send hello to any undefined neighbor. This switch
-	 is ignored on on any non-NBMA network. Default is No.
-
 </descrip>
 
 <sect1>Attributes
@@ -1162,13 +1167,17 @@ protocol ospf MyOSPF {
 		interface "ppp*" {
 			cost 100;
 		};
+		interface "arc0" {
+			cost 10;
+			stub yes;
+		};
 	};
 	area 120 {
 		stub yes;
 		interface "-arc0" , "arc*" {
 			type nonbroadcast;
 			authentication none;
-			strict nonbroadcast no;
+			strict nonbroadcast yes;
 			wait 120;
 			poll 40;
 			dead count 8;

proto/ospf/config.Y

@@ -88,6 +88,7 @@ ospf_iface_item:
  | TYPE NONBROADCAST { OSPF_PATT->type = OSPF_IT_NBMA ; }
  | TYPE POINTOPOINT { OSPF_PATT->type = OSPF_IT_PTP ; }
  | STRICT NONBROADCAST bool { OSPF_PATT->strictnbma = $3 ; }
+ | STUB bool { OSPF_PATT->stub = $2 ; }
  | NEIGHBORS '{' ipa_list '}'
  | AUTHENTICATION NONE { OSPF_PATT->autype=AU_NONE ; }
  | AUTHENTICATION SIMPLE { OSPF_PATT->autype=AU_SIMPLE ; }
@@ -137,6 +138,7 @@ ospf_iface_start:
   OSPF_PATT->deadc = DEADC_D;
   OSPF_PATT->type = OSPF_IT_UNDEF;
   OSPF_PATT->strictnbma = 0;
+  OSPF_PATT->stub = 0;
   init_list(&OSPF_PATT->nbma_list);
   OSPF_PATT->autype=AU_NONE;
  }

proto/ospf/hello.c

@@ -249,6 +249,8 @@ hello_send(timer *timer,int poll, struct ospf_neighbor *dirn)
   if(timer==NULL) ifa=dirn->ifa;
   else ifa=(struct ospf_iface *)timer->data;
 
+  if(ifa->stub) return;		/* Don't send any packet on stub iface */
+
   p=(struct proto *)(ifa->proto);
   DBG("%s: Hello/Poll timer fired on interface %s.\n",
     p->name, ifa->iface->name);

proto/ospf/iface.c

@@ -370,7 +370,8 @@ ospf_iface_info(struct ospf_iface *ifa)
   cli_msg(-1015,"Interface \"%s\":", ifa->iface->name);
   cli_msg(-1015,"\tArea: %I (%u)", ifa->oa->areaid, ifa->oa->areaid);
   cli_msg(-1015,"\tType: %s %s", ospf_it[ifa->type], strict);
-  cli_msg(-1015,"\tState: %s", ospf_is[ifa->state]);
+  cli_msg(-1015,"\tState: %s %s", ospf_is[ifa->state],
+    ifa->stub ? "(stub)" : "");
   cli_msg(-1015,"\tPriority: %u", ifa->priority);
   cli_msg(-1015,"\tCost: %u", ifa->cost);
   cli_msg(-1015,"\tHello timer: %u", ifa->helloint);
@@ -429,6 +430,7 @@ ospf_ifa_add(struct object_lock *lock)
   ifa->strictnbma=ip->strictnbma;
   ifa->waitint=ip->waitint;
   ifa->deadc=ip->deadc;
+  ifa->stub=ip->stub;
   ifa->autype=ip->autype;
   memcpy(ifa->aukey,ip->password,8);
   ifa->options=2;	/* FIXME what options? */

proto/ospf/ospf.c

@@ -558,14 +558,30 @@ ospf_reconfigure(struct proto *p, struct proto_config *c)
 	{
 	  ifa->strictnbma=ip2->strictnbma;
 	  OSPF_TRACE(D_EVENTS,
-	    "Interface %s is now strict NBMA",
+	    "Interface %s is now strict NBMA.",
 	    ifa->iface->name);
 	}
 	if((ip1->strictnbma!=0)&&(ip2->strictnbma==0))
 	{
 	  ifa->strictnbma=ip2->strictnbma;
 	  OSPF_TRACE(D_EVENTS,
-	    "Interface %s is no longer strict NBMA",
+	    "Interface %s is no longer strict NBMA.",
+	    ifa->iface->name);
+	}
+
+	/* stub */
+	if((ip1->stub==0)&&(ip2->stub!=0))
+	{
+	  ifa->stub=ip2->stub;
+	  OSPF_TRACE(D_EVENTS,
+	    "Interface %s is now stub.",
+	    ifa->iface->name);
+	}
+	if((ip1->stub!=0)&&(ip2->stub==0))
+	{
+	  ifa->stub=ip2->stub;
+	  OSPF_TRACE(D_EVENTS,
+	    "Interface %s is no longer stub.",
 	    ifa->iface->name);
 	}
 

proto/ospf/ospf.h

@@ -103,6 +103,7 @@ struct ospf_iface {
   u32 bdrid;
   u8 type;		/* OSPF view of type */
   u8 strictnbma;	/* Can I talk with unknown neighbors? */
+  u8 stub;		/* Inactive interface */
 #define OSPF_IT_BCAST 0
 #define OSPF_IT_NBMA 1
 #define OSPF_IT_PTP 2
@@ -390,6 +391,7 @@ struct ospf_iface_patt {
   int type;
   int autype;
   int strictnbma;
+  int stub;
 #define AU_NONE 0
 #define AU_SIMPLE 1
 #define AU_CRYPT 2

proto/ospf/packet.c

@@ -84,6 +84,8 @@ ospf_rx_hook(sock *sk, int size)
   int i;
   u8 *pu8;
 
+  if(ifa->stub) return(1);
+
   DBG("%s: RX_Hook called on interface %s.\n",p->name, sk->iface->name);
 
   ps = (struct ospf_packet *) ipv4_skip_header(sk->rbuf, &size);