zebra link state detection support

bgpd/bgp_zebra.c

@@ -208,7 +208,7 @@ bgp_interface_address_add (int command, struct zclient *zclient,
 
   bgp_if_update (ifc->ifp);
 
-  if (if_is_up (ifc->ifp))
+  if (if_is_operative (ifc->ifp))
     bgp_connected_add (ifc);
 
   return 0;
@@ -227,7 +227,7 @@ bgp_interface_address_delete (int command, struct zclient *zclient,
 
   bgp_if_update (ifc->ifp);
 
-  if (if_is_up (ifc->ifp))
+  if (if_is_operative (ifc->ifp))
     bgp_connected_delete (ifc);
 
   connected_free (ifc);

lib/if.c

@@ -270,6 +270,22 @@ if_is_up (struct interface *ifp)
   return ifp->flags & IFF_UP;
 }
 
+/* Is interface running? */
+int
+if_is_running (struct interface *ifp)
+{
+  return ifp->flags & IFF_RUNNING;
+}
+
+/* Is the interface operative, eg. either UP & RUNNING
+   or UP & !ZEBRA_INTERFACE_LINK_DETECTION */
+int
+if_is_operative (struct interface *ifp)
+{
+  return ((ifp->flags & IFF_UP) &&
+	  (ifp->flags & IFF_RUNNING || !CHECK_FLAG(ifp->status, ZEBRA_INTERFACE_LINKDETECTION)));
+}
+
 /* Is this loopback interface ? */
 int
 if_is_loopback (struct interface *ifp)

lib/if.h

@@ -85,6 +85,7 @@ struct interface
   u_char status;
 #define ZEBRA_INTERFACE_ACTIVE     (1 << 0)
 #define ZEBRA_INTERFACE_SUB        (1 << 1)
+#define ZEBRA_INTERFACE_LINKDETECTION (1 << 2)
 
   /* Interface flags. */
   unsigned long flags;
@@ -188,6 +189,8 @@ struct interface *if_lookup_address (struct in_addr);
 struct interface *if_get_by_name (char *);
 void if_delete (struct interface *);
 int if_is_up (struct interface *);
+int if_is_running (struct interface *);
+int if_is_operative (struct interface *);
 int if_is_loopback (struct interface *);
 int if_is_broadcast (struct interface *);
 int if_is_pointopoint (struct interface *);

lib/zclient.c

@@ -564,6 +564,7 @@ zebra_interface_add_read (struct stream *s)
   ifp->ifindex = stream_getl (s);
 
   /* Read interface's value. */
+  ifp->status = stream_getc (s);
   ifp->flags = stream_getl (s);
   ifp->metric = stream_getl (s);
   ifp->mtu = stream_getl (s);
@@ -600,6 +601,7 @@ zebra_interface_state_read (struct stream *s)
   ifp->ifindex = stream_getl (s);
 
   /* Read interface's value. */
+  ifp->status = stream_getc (s);
   ifp->flags = stream_getl (s);
   ifp->metric = stream_getl (s);
   ifp->mtu = stream_getl (s);

ospfd/ospf_ase.c

@@ -154,7 +154,7 @@ ospf_ase_forward_address_check (struct in_addr fwd_addr)
 
   for (ifn = listhead (ospf_top->oiflist); ifn; nextnode (ifn))
     if ((oi = getdata (ifn)) != NULL)
-      if (if_is_up (oi->ifp))
+      if (if_is_operative (oi->ifp))
 	if (oi->type != OSPF_IFTYPE_VIRTUALLINK)
 	  if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &fwd_addr))
 	    return 0;

ospfd/ospf_lsa.c

@@ -640,7 +640,7 @@ router_lsa_link_set (struct stream *s, struct ospf_area *area)
       struct interface *ifp = oi->ifp;
 
       /* Check interface is up, OSPF is enable. */
-      if (if_is_up (ifp))
+      if (if_is_operative (ifp))
 	{
 	  if (oi->state != ISM_Down)
 	    {
@@ -1391,7 +1391,7 @@ ospf_external_lsa_nexthop_get (struct in_addr nexthop)
     {
       struct ospf_interface *oi = getdata (n1);
 
-      if (if_is_up (oi->ifp))
+      if (if_is_operative (oi->ifp))
 	if (oi->address->family == AF_INET)
 	  if (prefix_match (oi->address, &nh))
 	    return nexthop;
@@ -1412,7 +1412,7 @@ ospf_get_ip_from_ifp (struct ospf_interface *oi)
 
   fwd.s_addr = 0;
 
-  if (if_is_up (oi->ifp))
+  if (if_is_operative (oi->ifp))
     return oi->address->u.prefix4;
 
   return fwd;
@@ -1432,7 +1432,7 @@ ospf_get_nssa_ip (void)
     {
       struct ospf_interface *oi = getdata (n1);
 
-      if (if_is_up (oi->ifp))
+      if (if_is_operative (oi->ifp))
 	if (oi->area->external_routing == OSPF_AREA_NSSA)
 	  if (oi->address && oi->address->family == AF_INET)
 	    return (oi->address->u.prefix4 );

ospfd/ospf_vty.c

@@ -2526,12 +2526,11 @@ show_ip_ospf_interface_sub (struct vty *vty, struct interface *ifp)
   oi_count = ospf_oi_count (ifp);
 
   /* Is interface up? */
-  if (if_is_up (ifp))
-    vty_out (vty, "%s is up, line protocol is up%s", ifp->name, VTY_NEWLINE);
-  else
-    {
-      vty_out (vty, "%s is down, line protocol is down%s", ifp->name,
-	       VTY_NEWLINE);
+  if (if_is_operative (ifp)) {
+  	vty_out (vty, "%s is up%s", ifp->name, VTY_NEWLINE);
+  } else
+  	{
+  		vty_out (vty, "%s is down%s", ifp->name, VTY_NEWLINE);
 
 
       if (oi_count == 0)

ospfd/ospf_zebra.c

@@ -154,6 +154,7 @@ zebra_interface_if_set_value (struct stream *s, struct interface *ifp)
   ifp->ifindex = stream_getl (s);
 
   /* Read interface's value. */
+  ifp->status = stream_getc (s);
   ifp->flags = stream_getl (s);
   ifp->metric = stream_getl (s);
   ifp->mtu = stream_getl (s);
@@ -175,7 +176,7 @@ ospf_interface_state_up (int command, struct zclient *zclient,
     return 0;
 
   /* Interface is already up. */
-  if (if_is_up (ifp))
+  if (if_is_operative (ifp))
     {
       /* Temporarily keep ifp values. */
       memcpy (&if_tmp, ifp, sizeof (struct interface));

ospfd/ospfd.c

@@ -761,7 +761,7 @@ ospf_network_run (struct ospf *ospf, struct prefix *p, struct ospf_area *area)
 
 		ospf_area_add_if (oi->area, oi);
 
-		if (if_is_up (ifp)) 
+		if (if_is_operative (ifp)) 
 		  ospf_if_up (oi);
 
 		break;

ripd/rip_interface.c

@@ -248,7 +248,7 @@ rip_request_interface (struct interface *ifp)
     return;
 
   /* If interface is down, don't send RIP packet. */
-  if (! if_is_up (ifp))
+  if (! if_is_operative (ifp))
     return;
 
   /* Fetch RIP interface information. */
@@ -311,7 +311,7 @@ rip_multicast_join (struct interface *ifp, int sock)
 {
   listnode cnode;
 
-  if (if_is_up (ifp) && if_is_multicast (ifp))
+  if (if_is_operative (ifp) && if_is_multicast (ifp))
     {
       if (IS_RIP_DEBUG_EVENT)
 	zlog_info ("multicast join at %s", ifp->name);
@@ -705,7 +705,7 @@ rip_if_down(struct interface *ifp)
 	      {
 		/* All redistributed routes but static and system */
 		if ((rinfo->ifindex == ifp->ifindex) &&
-		    (rinfo->type != ZEBRA_ROUTE_STATIC) &&
+		    /* (rinfo->type != ZEBRA_ROUTE_STATIC) && */
 		    (rinfo->type != ZEBRA_ROUTE_SYSTEM))
 		  rip_redistribute_delete (rinfo->type,rinfo->sub_type,
 					   (struct prefix_ipv4 *)&rp->p,
@@ -1008,7 +1008,7 @@ rip_enable_apply (struct interface *ifp)
   if (if_is_loopback (ifp))
     return;
 
-  if (! if_is_up (ifp))
+  if (! if_is_operative (ifp))
     return;
 
   ri = ifp->info;

ripd/ripd.c

@@ -2231,7 +2231,7 @@ rip_update_process (int route_type)
       if (if_is_loopback (ifp))
 	continue;
 
-      if (! if_is_up (ifp))
+      if (! if_is_operative (ifp))
 	continue;
 
       /* Fetch RIP interface information. */

zebra/interface.c

@@ -147,7 +147,7 @@ if_addr_wakeup (struct interface *ifp)
 
 	      zebra_interface_address_add_update (ifp, ifc);
 
-	      if (if_is_up(ifp))
+	      if (if_is_operative(ifp))
 		connected_up_ipv4 (ifp, ifc);
 	    }
 #ifdef HAVE_IPV6
@@ -170,7 +170,7 @@ if_addr_wakeup (struct interface *ifp)
 
 	      zebra_interface_address_add_update (ifp, ifc);
 
-	      if (if_is_up(ifp))
+	      if (if_is_operative(ifp))
 		connected_up_ipv6 (ifp, ifc);
 	    }
 #endif /* HAVE_IPV6 */
@@ -334,16 +334,16 @@ if_down (struct interface *ifp)
 void
 if_refresh (struct interface *ifp)
 {
-  if (if_is_up (ifp))
+  if (if_is_operative (ifp))
     {
       if_get_flags (ifp);
-      if (! if_is_up (ifp))
+      if (! if_is_operative (ifp))
 	if_down (ifp);
     }
   else
     {
       if_get_flags (ifp);
-      if (if_is_up (ifp))
+      if (if_is_operative (ifp))
 	if_up (ifp);
     }
 }
@@ -479,8 +479,22 @@ if_dump_vty (struct vty *vty, struct interface *ifp)
   struct connected *connected;
   listnode node;
 
-  vty_out (vty, "Interface %s%s", ifp->name,
-	   VTY_NEWLINE);
+  vty_out (vty, "Interface %s is ", ifp->name);
+  if (if_is_up(ifp)) {
+    vty_out (vty, "up, line protocol ");
+
+    if (CHECK_FLAG(ifp->status, ZEBRA_INTERFACE_LINKDETECTION)) {
+      if (if_is_running(ifp))
+       vty_out (vty, "is up%s", VTY_NEWLINE);
+      else
+	vty_out (vty, "is down%s", VTY_NEWLINE);
+    } else {
+      vty_out (vty, "detection is disabled%s", VTY_NEWLINE);
+    }
+  } else {
+    vty_out (vty, "down%s", VTY_NEWLINE);
+  }
+
   if (ifp->desc)
     vty_out (vty, "  Description: %s%s", ifp->desc,
 	     VTY_NEWLINE);
@@ -790,6 +804,51 @@ DEFUN (no_multicast,
   return CMD_SUCCESS;
 }
 
+DEFUN (linkdetect,
+       linkdetect_cmd,
+       "link-detect",
+       "Enable link detection on interface\n")
+{
+  int ret;
+  struct interface *ifp;
+  int if_was_operative;
+
+  ifp = (struct interface *) vty->index;
+  if_was_operative = if_is_operative(ifp);
+  SET_FLAG(ifp->status, ZEBRA_INTERFACE_LINKDETECTION);
+
+  /* When linkdetection is enabled, if might come down */
+  if (!if_is_operative(ifp) && if_was_operative) if_down(ifp);
+
+  /* FIXME: Will defer status change forwarding if interface
+     does not come down! */
+
+  return CMD_SUCCESS;
+}
+
+
+DEFUN (no_linkdetect,
+       no_linkdetect_cmd,
+       "no link-detect",
+       NO_STR
+       "Disable link detection on interface\n")
+{
+  int ret;
+  struct interface *ifp;
+  int if_was_operative;
+
+  ifp = (struct interface *) vty->index;
+  if_was_operative = if_is_operative(ifp);
+  UNSET_FLAG(ifp->status, ZEBRA_INTERFACE_LINKDETECTION);
+
+  /* Interface may come up after disabling link detection */
+  if (if_is_operative(ifp) && !if_was_operative) if_up(ifp);
+
+  /* FIXME: see linkdetect_cmd */
+
+  return CMD_SUCCESS;
+}
+
 DEFUN (shutdown_if,
        shutdown_if_cmd,
        "shutdown",
@@ -859,7 +918,7 @@ DEFUN (bandwidth_if,
   ifp->bandwidth = bandwidth;
 
   /* force protocols to recalculate routes due to cost change */
-  if (if_is_up (ifp))
+  if (if_is_operative (ifp))
     zebra_interface_up_update (ifp);
 
   return CMD_SUCCESS;
@@ -878,7 +937,7 @@ DEFUN (no_bandwidth_if,
   ifp->bandwidth = 0;
 
   /* force protocols to recalculate routes due to cost change */
-  if (if_is_up (ifp))
+  if (if_is_operative (ifp))
     zebra_interface_up_update (ifp);
 
   return CMD_SUCCESS;
@@ -971,7 +1030,7 @@ ip_address_install (struct vty *vty, struct interface *ifp, char *addr_str,
       zebra_interface_address_add_update (ifp, ifc);
 
       /* If interface is up register connected route. */
-      if (if_is_up(ifp))
+      if (if_is_operative(ifp))
 	connected_up_ipv4 (ifp, ifc);
     }
 
@@ -1179,7 +1238,7 @@ ipv6_address_install (struct vty *vty, struct interface *ifp, char *addr_str,
       zebra_interface_address_add_update (ifp, ifc);
 
       /* If interface is up register connected route. */
-      if (if_is_up(ifp))
+      if (if_is_operative(ifp))
 	connected_up_ipv6 (ifp, ifc);
     }
 
@@ -1315,6 +1374,9 @@ if_config_write (struct vty *vty)
       if (ifp->bandwidth != 0)
 	vty_out(vty, " bandwidth %u%s", ifp->bandwidth, VTY_NEWLINE); 
 
+      if (CHECK_FLAG(ifp->status, ZEBRA_INTERFACE_LINKDETECTION))
+	vty_out(vty, " link-detect%s", VTY_NEWLINE);
+
       for (addrnode = listhead (ifp->connected); addrnode; nextnode (addrnode))
 	  {
 	    ifc = getdata (addrnode);
@@ -1377,6 +1439,8 @@ zebra_if_init ()
   install_element (INTERFACE_NODE, &no_interface_desc_cmd);
   install_element (INTERFACE_NODE, &multicast_cmd);
   install_element (INTERFACE_NODE, &no_multicast_cmd);
+  install_element (INTERFACE_NODE, &linkdetect_cmd);
+  install_element (INTERFACE_NODE, &no_linkdetect_cmd);
   install_element (INTERFACE_NODE, &shutdown_if_cmd);
   install_element (INTERFACE_NODE, &no_shutdown_if_cmd);
   install_element (INTERFACE_NODE, &bandwidth_if_cmd);

zebra/rt_netlink.c

@@ -787,16 +787,16 @@ netlink_link_change (struct sockaddr_nl *snl, struct nlmsghdr *h)
 	  ifp->mtu = *(int *)RTA_DATA (tb[IFLA_MTU]);
 	  ifp->metric = 1;
 
-	  if (if_is_up (ifp))
+	  if (if_is_operative (ifp))
 	    {
 	      ifp->flags = ifi->ifi_flags & 0x0000fffff;
-	      if (! if_is_up (ifp))
+	      if (! if_is_operative (ifp))
 		if_down (ifp);
 	    }
 	  else
 	    {
 	      ifp->flags = ifi->ifi_flags & 0x0000fffff;
-	      if (if_is_up (ifp))
+	      if (if_is_operative (ifp))
 		if_up (ifp);
 	    }
 	}