Minor finalizations of link state checks.

doc/bird.sgml

@@ -1675,7 +1675,7 @@ protocol ospf <name> {
 	<tag>rx buffer <M>num</M></tag>
 	 This sets the size of buffer used for receiving packets. The buffer should
 	 be bigger than maximal size of any packets. Value NORMAL (default)
-	 means 2*MTU, value LARGE means maximal allowed packet - 65536.
+	 means 2*MTU, value LARGE means maximal allowed packet - 65535.
 
 	<tag>type broadcast</tag>
 	 BIRD detects a type of a connected network automatically, but sometimes it's
@@ -1695,6 +1695,14 @@ protocol ospf &lt;name&gt; {
 	 If set, don't send hello to any undefined neighbor. This switch
 	 is ignored on any non-NBMA network. Default is No.
 
+	<tag>check link <M>switch</M></tag>
+	 if set, a hardware link state (reported by OS) is taken into
+	 consideration. When a link disappears (e.g. an ethernet cable is
+	 unplugged), neighbors are immediately considered unreachable
+	 and only the address of the iface (instead of whole network
+	 prefix) is propagated. It is possible that some hardware
+	 drivers or platforms do not implement this feature. Default: off.
+
 	<tag>authentication none</tag>
 	 No passwords are sent in OSPF packets. This is the default value.
 
@@ -2045,8 +2053,8 @@ the next hop of the route is not a neighbor at the moment), Static just
 uninstalls the route from the table it is connected to and adds it again as soon
 as the destination becomes adjacent again.
 
-<p>The Static protocol has no configuration options. Instead, the
+<p>The Static protocol does not have many configuration options. The
-definition of the protocol contains a list of static routes:
+definition of the protocol contains mainly a list of static routes:
 
 <descrip>
 	<tag>route <m/prefix/ via <m/ip/</tag> Static route through
@@ -2056,6 +2064,14 @@ definition of the protocol contains a list of static routes:
 	<tag>route <m/prefix/ drop|reject|prohibit</tag> Special routes
 	specifying to drop the packet, return it as unreachable or return
 	it as administratively prohibited.
+
+	<tag>check link <M>switch</M></tag>
+	The only option of the static protocol. If set, hardware link
+	states of network interfaces are taken into consideration.
+	When link disappears (e.g. ethernet cable is unplugged),
+	static routes directing to that interface are removed. It is
+	possible that some hardware drivers or platforms do not
+	implement this feature. Default: off.
 </descrip>
 
 <p>Static routes have no specific attributes.

proto/ospf/config.Y

@@ -49,7 +49,7 @@ CF_KEYWORDS(OSPF, AREA, OSPF_METRIC1, OSPF_METRIC2, OSPF_TAG, OSPF_ROUTER_ID)
 CF_KEYWORDS(BROADCAST, 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(ELIGIBLE, POLL, NETWORKS, HIDDEN, VIRTUAL, CHECK, LINK)
 CF_KEYWORDS(RX, BUFFER, LARGE, NORMAL, STUBNET, HIDDEN, SUMMARY)
 CF_KEYWORDS(WAIT, DELAY, LSADB)
 
@@ -192,7 +192,7 @@ ospf_iface_item:
  | TYPE POINTOPOINT { OSPF_PATT->type = OSPF_IT_PTP ; }
  | STRICT NONBROADCAST bool { OSPF_PATT->strictnbma = $3 ; }
  | STUB bool { OSPF_PATT->stub = $2 ; }
- | LINK bool { OSPF_PATT->use_link = $2 ; }
+ | CHECK LINK bool { OSPF_PATT->check_link = $3; }
  | NEIGHBORS '{' ipa_list '}'
  | AUTHENTICATION NONE { OSPF_PATT->autype = OSPF_AUTH_NONE ; }
  | AUTHENTICATION SIMPLE { OSPF_PATT->autype = OSPF_AUTH_SIMPLE ; }
@@ -274,9 +274,6 @@ ospf_iface_start:
   OSPF_PATT->deadc = DEADC_D;
   OSPF_PATT->dead = 0;
   OSPF_PATT->type = OSPF_IT_UNDEF;
-  OSPF_PATT->strictnbma = 0;
-  OSPF_PATT->stub = 0;
-  OSPF_PATT->use_link = 1;
   init_list(&OSPF_PATT->nbma_list);
   OSPF_PATT->autype = OSPF_AUTH_NONE;
   reset_passwords();

proto/ospf/hello.c

@@ -247,7 +247,7 @@ ospf_hello_send(timer *timer, int poll, struct ospf_neighbor *dirn)
   else
     ifa = (struct ospf_iface *) timer->data;
 
-  if (ifa->state == OSPF_IS_DOWN)
+  if (ifa->state <= OSPF_IS_LOOP)
     return;
 
   if (ifa->stub)

proto/ospf/iface.c

@@ -334,7 +334,7 @@ ospf_iface_sm(struct ospf_iface *ifa, int event)
     break;
 
   case ISM_LOOP:
-    if (ifa->sk && ifa->use_link)
+    if (ifa->sk && ifa->check_link)
       ospf_iface_chstate(ifa, OSPF_IS_LOOP);
     break;
 
@@ -401,7 +401,7 @@ ospf_iface_add(struct object_lock *lock)
   }
 
   /* Do iface UP, unless there is no link and we use link detection */
-  ospf_iface_sm(ifa, (ifa->use_link && !(ifa->iface->flags & IF_LINK_UP)) ? ISM_LOOP : ISM_UP);
+  ospf_iface_sm(ifa, (ifa->check_link && !(ifa->iface->flags & IF_LINK_UP)) ? ISM_LOOP : ISM_UP);
 }
 
 void
@@ -435,7 +435,7 @@ ospf_iface_new(struct proto_ospf *po, struct iface *iface, struct ifa *addr,
   ifa->stub = ospf_iface_stubby(ip, addr);
   ifa->ioprob = OSPF_I_OK;
   ifa->rxbuf = ip->rxbuf;
-  ifa->use_link = ip->use_link;
+  ifa->check_link = ip->check_link;
 
 #ifdef OSPFv2
   ifa->autype = ip->autype;

proto/ospf/neighbor.c

@@ -284,6 +284,7 @@ can_do_adj(struct ospf_neighbor *n)
     switch (ifa->state)
     {
     case OSPF_IS_DOWN:
+    case OSPF_IS_LOOP:
       bug("%s: Iface %s in down state?", p->name, ifa->iface->name);
       break;
     case OSPF_IS_WAITING:

proto/ospf/ospf.c

@@ -759,12 +759,12 @@ ospf_reconfigure(struct proto *p, struct proto_config *c)
 	}
 
 	/* LINK */
-	if (oldip->use_link != newip->use_link)
+	if (oldip->check_link != newip->check_link)
 	{
-	  ifa->use_link = newip->use_link;
+	  ifa->check_link = newip->check_link;
 
 	  if (!(ifa->iface->flags & IF_LINK_UP))
-	    ospf_iface_sm(ifa, ifa->use_link ? ISM_LOOP : ISM_UNLOOP);
+	    ospf_iface_sm(ifa, ifa->check_link ? ISM_LOOP : ISM_UNLOOP);
 	}
 
 	/* strict nbma */

proto/ospf/ospf.h

@@ -246,7 +246,7 @@ struct ospf_iface
   u8 sk_spf;			/* Socket is a member of SPFRouters group */
   u8 sk_dr; 			/* Socket is a member of DRouters group */
   u16 rxbuf;			/* Buffer size */
-  u8 use_link;			/* Whether iface link change is used */
+  u8 check_link;		/* Whether iface link change is used */
 };
 
 struct ospf_md5
@@ -755,7 +755,7 @@ struct ospf_iface_patt
   u32 stub;
   u32 vid;
   u16 rxbuf;
-  u8 use_link;
+  u8 check_link;
 #define OSPF_RXBUF_NORMAL 0
 #define OSPF_RXBUF_LARGE 1
 #define OSPF_RXBUF_MINSIZE 256	/* Minimal allowed size */

proto/static/config.Y

@@ -32,7 +32,7 @@ static_proto_start: proto_start STATIC {
 static_proto:
    static_proto_start proto_name '{'
  | static_proto proto_item ';'
- | static_proto CHECK LINK ';' { STATIC_CFG->check = STATIC_CHECK_LINK; }
+ | static_proto CHECK LINK bool ';' { STATIC_CFG->check_link = $4; }
  | static_proto stat_route ';'
  ;
 

proto/static/static.c

@@ -72,7 +72,7 @@ static_decide(struct static_config *cf, struct static_route *r)
   if (!ifa)
     return 0;
 
-  if ((cf->check == STATIC_CHECK_LINK) && !(ifa->flags & IF_LINK_UP))
+  if (cf->check_link && !(ifa->flags & IF_LINK_UP))
     return 0;
 
   return 1;

proto/static/static.h

@@ -13,11 +13,9 @@ struct static_config {
   struct proto_config c;
   list iface_routes;		/* Routes to search on interface events */
   list other_routes;		/* Routes hooked to neighbor cache and reject routes */
-  int check;			/* Condition for route install */
+  int check_link;		/* Whether iface link state is used */
 };
 
-#define STATIC_CHECK_NONE 0
-#define STATIC_CHECK_LINK 1
 
 void static_init_config(struct static_config *);