Implements an option that allows to change a set of stub networks.

doc/bird.sgml

@@ -1195,8 +1195,13 @@ protocol ospf <name> {
 			<prefix>;
 			<prefix> hidden;
 		}
-		interface <interface pattern>
-		{
+		stubnet <prefix>;
+		stubnet <prefix> {
+			hidden <switch>;
+			summary <switch>;
+			cost <num>;
+		}
+		interface <interface pattern> {
 			cost <num>;
 			stub <switch>;
 			hello <num>;
@@ -1223,8 +1228,7 @@ protocol ospf <name> {
 				<ip> eligible;
 			};
 		};
-		virtual link <id>
-		{
+		virtual link <id>	{
 			hello <num>;
 			retransmit <num>;
 			wait <num>;
@@ -1265,6 +1269,24 @@ protocol ospf <name> {
          Definition of area IP ranges. This is used in summary lsa origination.
 	 Hidden networks are not propagated into other areas.
 
+	<tag>stubnet <m/prefix/ { <m/options/ }</tag>
+	 Stub networks are networks that are not transit networks
+	 between OSPF routers. They are also propagated through an
+	 OSPF area as a part of a link state database. By default,
+	 BIRD generates a stub network record for each primary network
+	 address on each OSPF interface that does not have any OSPF
+	 neighbors, and also for each non-primary network address on
+	 each OSPF interface. This option allows to alter a set of
+	 stub networks propagated by this router. 
+
+	 Each instance of this option adds a stub network with given
+	 network prefix to the set of propagated stub network, unless
+	 option <cf/hidden/ is used. It also suppresses default stub
+	 networks for given network prefix. When option
+	 <cf/summary/ is used, also default stub networks that are
+	 subnetworks of given stub network are suppressed. This might
+	 be used, for example, to aggregate generated stub networks.
+	 
 	<tag>interface <M>pattern</M></tag>
 	 Defines that the specified interfaces belong to the area being defined.
 	 See <ref id="dsc-iface" name="interface"> common option for detailed description.

proto/ospf/config.Y

@@ -18,6 +18,7 @@ CF_DEFINES
 static struct ospf_area_config *this_area;
 static struct nbma_node *this_nbma;
 static struct area_net_config *this_pref;
+static struct ospf_stubnet_config *this_stubnet; 
 
 static void
 finish_iface_config(struct ospf_iface_patt *ip)
@@ -38,7 +39,7 @@ CF_KEYWORDS(NEIGHBORS, RFC1583COMPAT, STUB, TICK, COST, RETRANSMIT)
 CF_KEYWORDS(HELLO, TRANSMIT, PRIORITY, DEAD, NONBROADCAST, POINTOPOINT, TYPE)
 CF_KEYWORDS(NONE, SIMPLE, AUTHENTICATION, STRICT, CRYPTOGRAPHIC)
 CF_KEYWORDS(ELIGIBLE, POLL, NETWORKS, HIDDEN, VIRTUAL, LINK)
-CF_KEYWORDS(RX, BUFFER, LARGE, NORMAL)
+CF_KEYWORDS(RX, BUFFER, LARGE, NORMAL, STUBNET, HIDDEN, SUMMARY)
 
 %type <t> opttext
 
@@ -75,6 +76,7 @@ ospf_area_start: AREA idval '{' {
   init_list(&this_area->patt_list);
   init_list(&this_area->vlink_list);
   init_list(&this_area->net_list);
+  init_list(&this_area->stubnet_list);
  }
  ;
 
@@ -90,10 +92,36 @@ ospf_area_item:
    STUB COST expr { this_area->stub = $3 ; if($3<=0) cf_error("Stub cost must be greater than zero"); }
  | STUB bool {if($2) { if(!this_area->stub) this_area->stub=DEFAULT_STUB_COST;}else{ this_area->stub=0;}}
  | NETWORKS '{' pref_list '}'
+ | STUBNET ospf_stubnet
  | INTERFACE ospf_iface
  | ospf_vlink
  ;
 
+ospf_stubnet:
+   ospf_stubnet_start '{' ospf_stubnet_opts '}'
+ | ospf_stubnet_start
+ ;
+
+ospf_stubnet_start:
+   prefix {
+     this_stubnet = cfg_allocz(sizeof(struct stubnet_config));
+     add_tail(&this_area->stubnet_list, NODE this_stubnet);
+     this_stubnet->px = $1;
+     this_stubnet->cost = COST_D;
+   } 
+ ;
+
+ospf_stubnet_opts:
+   /* empty */
+ | ospf_stubnet_opts ospf_stubnet_item ';'
+ ;
+
+ospf_stubnet_item:
+   HIDDEN bool { this_stubnet->hidden = $2; }
+ | SUMMARY bool { this_stubnet->summary = $2; }
+ | COST expr { this_stubnet->cost = $2; }
+ ;
+
 ospf_vlink:
    ospf_vlink_start '{' ospf_vlink_opts '}' { finish_iface_config(OSPF_PATT); }
  | ospf_vlink_start

proto/ospf/ospf.c

@@ -148,6 +148,7 @@ ospf_start(struct proto *p)
     oa = mb_allocz(p->pool, sizeof(struct ospf_area));
     add_tail(&po->area_list, NODE oa);
     po->areano++;
+    oa->ac = ac;
     oa->stub = ac->stub;
     oa->areaid = ac->areaid;
     oa->rt = NULL;
@@ -629,9 +630,31 @@ ospf_reconfigure(struct proto *p, struct proto_config *c)
     if (!oa)
       return 0;
 
+    oa->ac = newac;
     oa->stub = newac->stub;
     if (newac->stub && (oa->areaid == 0)) oa->stub = 0;
 
+    /* Check stubnet_list */
+    struct ospf_stubnet_config *oldsn = HEAD(oldac->stubnet_list);
+    struct ospf_stubnet_config *newsn = HEAD(newac->stubnet_list);
+
+    while (((NODE(oldsn))->next != NULL) && ((NODE(newsn))->next != NULL))
+      {
+	if (!ipa_equal(oldsn->px.addr, newsn->px.addr) ||
+	    (oldsn->px.len != newsn->px.len) ||
+	    (oldsn->hidden != newsn->hidden) ||
+	    (oldsn->summary != newsn->summary) ||
+	    (oldsn->cost != newsn->cost))
+	  break;
+
+	oldsn = (struct ospf_stubnet_config *)(NODE(oldsn))->next;
+	newsn = (struct ospf_stubnet_config *)(NODE(newsn))->next;
+      }
+
+    /* If there is no change, both pointers should be NULL */
+    if (((NODE(oldsn))->next) != ((NODE(newsn))->next))
+      schedule_rt_lsa(oa);
+
     /* Change net_list */
     FIB_WALK(&oa->net_fib, nf)	/* First check if some networks are deleted */
     {

proto/ospf/ospf.h

@@ -99,6 +99,14 @@ struct area_net
   u32 metric;
 };
 
+struct ospf_stubnet_config
+{
+  node n;
+  struct prefix px;
+  int hidden, summary;
+  u32 cost;
+};
+
 struct ospf_area_config
 {
   node n;
@@ -107,6 +115,7 @@ struct ospf_area_config
   list patt_list;
   list vlink_list;
   list net_list;
+  list stubnet_list;
 };
 
 struct obits
@@ -523,6 +532,7 @@ struct ospf_area
 {
   node n;
   u32 areaid;
+  struct ospf_area_config *ac;	/* Related area config */
   int origrt;			/* Rt lsa origination scheduled? */
   struct top_hash_entry *rt;	/* My own router LSA */
   list cand;			/* List of candidates for RT calc. */

proto/ospf/topology.c

@@ -52,6 +52,25 @@ lsab_flush(struct proto_ospf *po)
   return r;
 }
 
+static int
+configured_stubnet(struct ospf_area *oa, struct ifa *a)
+{
+  struct ospf_stubnet_config *sn;
+  WALK_LIST(sn, oa->ac->stubnet_list)
+    {
+      if (sn->summary)
+	{
+	  if (ipa_in_net(a->prefix, sn->px.addr, sn->px.len) && (a->pxlen >= sn->px.len))
+	    return 1;
+	}
+      else
+	{
+	  if (ipa_equal(a->prefix, sn->px.addr) && (a->pxlen == sn->px.len))
+	    return 1;
+	}
+    }
+  return 0;
+}
 
 static void *
 originate_rt_lsa_body(struct ospf_area *oa, u16 * length)
@@ -163,9 +182,11 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 * length)
       {
 	if (((a == ifa->iface->addr) && master) ||
 	    (a->flags & IA_SECONDARY) ||
-	    (a->flags & IA_UNNUMBERED))
+	    (a->flags & IA_UNNUMBERED) ||
+	    configured_stubnet(oa, a))
 	  continue;
 
+
 	ln = lsab_alloc(po, sizeof(struct ospf_lsa_rt_link));
 	ln->type = LSART_STUB;
 	ln->id = ipa_to_u32(a->prefix);
@@ -176,6 +197,19 @@ originate_rt_lsa_body(struct ospf_area *oa, u16 * length)
       }
   }
 
+  struct ospf_stubnet_config *sn;
+  WALK_LIST(sn, oa->ac->stubnet_list)
+    if (!sn->hidden)
+      {
+	ln = lsab_alloc(po, sizeof(struct ospf_lsa_rt_link));
+	ln->type = LSART_STUB;
+	ln->id = ipa_to_u32(sn->px.addr);
+	ln->data = ipa_to_u32(ipa_mkmask(sn->px.len));
+	ln->metric = sn->cost;
+	ln->notos = 0;
+	i++;
+      }
+
   rt = po->lsab;
   rt->links = i;
   rt->veb.bit.v = bitv;