ripng_interface.c

大名鼎鼎的路由器源码。程序分ZEBRA、OSPFRIP等3个包。程序框架采用一个路由协议一个进程的方式

}

/* Delete interface from ripng_enable_if. */
int
ripng_enable_if_delete (char *ifname)
{
  int index;
  char *str;

  index = ripng_enable_if_lookup (ifname);
  if (index < 0)
    return -1;

  str = vector_slot (ripng_enable_if, index);
  free (str);
  vector_unset (ripng_enable_if, index);

  return 1;
}

/* Wake up interface. */
int
ripng_interface_wakeup (struct thread *t)
{
  struct interface *ifp;
  struct ripng_interface *ri;

  /* Get interface. */
  ifp = THREAD_ARG (t);

  ri = ifp->info;
  ri->t_wakeup = NULL;

  /* Join to multicast group. */
  ripng_multicast_join (ifp);

  /* Send RIP request to the interface. */
  ripng_request (ifp);

  return 0;
}

/* Check RIPng is enabed on this interface. */
void
ripng_enable_apply (struct interface *ifp)
{
  int ret;
  struct ripng_interface *ri = NULL;

  /* Check interface. */
  if (if_is_loopback (ifp))
    return;

  if (! if_is_up (ifp))
    return;
  
  ri = ifp->info;

  /* Check network configuration. */
  ret = ripng_enable_network_lookup (ifp);

  /* If the interface is matched. */
  if (ret > 0)
    ri->enable_network = 1;
  else
    ri->enable_network = 0;

  /* Check interface name configuration. */
  ret = ripng_enable_if_lookup (ifp->name);
  if (ret >= 0)
    ri->enable_interface = 1;
  else
    ri->enable_interface = 0;

  /* Update running status of the interface. */
  if (ri->enable_network || ri->enable_interface)
    {
      if (! ri->running)
	{
	  if (IS_RIPNG_DEBUG_EVENT)
	    zlog_info ("RIPng turn on %s", ifp->name);

	  /* Add interface wake up thread. */
	  if (! ri->t_wakeup)
	    ri->t_wakeup = thread_add_timer (master, ripng_interface_wakeup,
					     ifp, 1);
#if 0
	  /* Join to multicast group. */
	  ripng_multicast_join (ifp);

	  /* Send RIP request to the interface. */
	  ripng_request (ifp);
#endif /* 0 */

	  ri->running = 1;
	}
    }
  else
    {
      if (ri->running)
	{
	  if (IS_RIPNG_DEBUG_EVENT)
	    zlog_info ("RIPng turn off %s", ifp->name);

	  /* Leave from multicast group. */
	  ripng_multicast_leave (ifp);

	  ri->running = 0;
	}
    }
}

/* Set distribute list to all interfaces. */
static void
ripng_enable_apply_all ()
{
  struct interface *ifp;
  listnode node;

  for (node = listhead (iflist); node; nextnode (node))
    {
      ifp = getdata (node);
      ripng_enable_apply (ifp);
    }
}

/* Vector to store passive-interface name. */
vector Vripng_passive_interface;

/* Utility function for looking up passive interface settings. */
int
ripng_passive_interface_lookup (char *ifname)
{
  int i;
  char *str;

  for (i = 0; i < vector_max (Vripng_passive_interface); i++)
    if ((str = vector_slot (Vripng_passive_interface, i)) != NULL)
      if (strcmp (str, ifname) == 0)
	return i;
  return -1;
}

void
ripng_passive_interface_apply (struct interface *ifp)
{
  int ret;
  struct ripng_interface *ri;

  ri = ifp->info;

  ret = ripng_passive_interface_lookup (ifp->name);
  if (ret < 0)
    ri->passive = 0;
  else
    ri->passive = 1;
}

void
ripng_passive_interface_apply_all (void)
{
  struct interface *ifp;
  listnode node;

  for (node = listhead (iflist); node; nextnode (node))
    {
      ifp = getdata (node);
      ripng_passive_interface_apply (ifp);
    }
}

/* Passive interface. */
int
ripng_passive_interface_set (struct vty *vty, char *ifname)
{
  if (ripng_passive_interface_lookup (ifname) >= 0)
    return CMD_WARNING;

  vector_set (Vripng_passive_interface, strdup (ifname));

  ripng_passive_interface_apply_all ();

  return CMD_SUCCESS;
}

int
ripng_passive_interface_unset (struct vty *vty, char *ifname)
{
  int i;
  char *str;

  i = ripng_passive_interface_lookup (ifname);
  if (i < 0)
    return CMD_WARNING;

  str = vector_slot (Vripng_passive_interface, i);
  free (str);
  vector_unset (Vripng_passive_interface, i);

  ripng_passive_interface_apply_all ();

  return CMD_SUCCESS;
}

/* Free all configured RIP passive-interface settings. */
void
ripng_passive_interface_clean (void)
{
  int i;
  char *str;

  for (i = 0; i < vector_max (Vripng_passive_interface); i++)
    if ((str = vector_slot (Vripng_passive_interface, i)) != NULL)
      {
	free (str);
	vector_slot (Vripng_passive_interface, i) = NULL;
      }
  ripng_passive_interface_apply_all ();
}

/* Write RIPng enable network and interface to the vty. */
int
ripng_network_write (struct vty *vty)
{
  int i;
  char *str;
  char *ifname;
  struct route_node *node;
  char buf[BUFSIZ];

  /* Write enable network. */
  for (node = route_top (ripng_enable_network); node; node = route_next (node))
    if (node->info)
      {
	struct prefix *p = &node->p;
	vty_out (vty, " network %s/%d%s", 
		 inet_ntop (p->family, &p->u.prefix, buf, BUFSIZ),
		 p->prefixlen,
		 VTY_NEWLINE);

      }
  
  /* Write enable interface. */
  for (i = 0; i < vector_max (ripng_enable_if); i++)
    if ((str = vector_slot (ripng_enable_if, i)) != NULL)
      vty_out (vty, " network %s%s", str,
	       VTY_NEWLINE);

  /* Write passive interface. */
  for (i = 0; i < vector_max (Vripng_passive_interface); i++)
    if ((ifname = vector_slot (Vripng_passive_interface, i)) != NULL)
      vty_out (vty, " passive-interface %s%s", ifname, VTY_NEWLINE);

  return 0;
}

/* RIPng enable on specified interface or matched network. */
DEFUN (ripng_network,
       ripng_network_cmd,
       "network IF_OR_ADDR",
       "RIPng enable on specified interface or network.\n"
       "Interface or address")
{
  int ret;
  struct prefix p;

  ret = str2prefix (argv[0], &p);

  /* Given string is IPv6 network or interface name. */
  if (ret)
    ret = ripng_enable_network_add (&p);
  else
    ret = ripng_enable_if_add (argv[0]);

  if (ret < 0)
    {
      vty_out (vty, "There is same network configuration %s%s", argv[0],
	       VTY_NEWLINE);
      return CMD_WARNING;
    }

  ripng_enable_apply_all ();

  return CMD_SUCCESS;
}

/* RIPng enable on specified interface or matched network. */
DEFUN (no_ripng_network,
       no_ripng_network_cmd,
       "no network IF_OR_ADDR",
       NO_STR
       "RIPng enable on specified interface or network.\n"
       "Interface or address")
{
  int ret;
  struct prefix p;

  ret = str2prefix (argv[0], &p);

  /* Given string is interface name. */
  if (ret)
    ret = ripng_enable_network_delete (&p);
  else
    ret = ripng_enable_if_delete (argv[0]);

  if (ret < 0)
    {
      vty_out (vty, "can't find network %s%s", argv[0],
	       VTY_NEWLINE);
      return CMD_WARNING;
    }
  
  ripng_enable_apply_all ();

  return CMD_SUCCESS;
}

DEFUN (ripng_passive_interface,
       ripng_passive_interface_cmd,
       "passive-interface IFNAME",
       "Suppress routing updates on an interface\n"
       "Interface name\n")
{
  return ripng_passive_interface_set (vty, argv[0]);
}

DEFUN (no_ripng_passive_interface,
       no_ripng_passive_interface_cmd,
       "no passive-interface IFNAME",
       NO_STR
       "Suppress routing updates on an interface\n"
       "Interface name\n")
{
  return ripng_passive_interface_unset (vty, argv[0]);
}

struct ripng_interface *
ri_new ()
{
  struct ripng_interface *ri;
  ri = XCALLOC (MTYPE_IF, sizeof (struct ripng_interface));
  return ri;
}

int
ripng_if_new_hook (struct interface *ifp)
{
  ifp->info = ri_new ();
  return 0;
}

/* Configuration write function for ripngd. */
int
interface_config_write (struct vty *vty)
{
  listnode node;
  struct interface *ifp;
  struct ripng_interface *ri;
  int write = 0;

  for (node = listhead (iflist); node; nextnode (node))
    {
      ifp = getdata (node);
      ri = ifp->info;

      vty_out (vty, "interface %s%s", ifp->name,
	       VTY_NEWLINE);
      if (ifp->desc)
	vty_out (vty, " description %s%s", ifp->desc,
		 VTY_NEWLINE);

      vty_out (vty, "!%s", VTY_NEWLINE);

      write++;
    }
  return write;
}

/* ripngd's interface node. */
struct cmd_node interface_node =
{
  INTERFACE_NODE,
  "%s(config-if)# ",
};

/* Initialization of interface. */
void
ripng_if_init ()
{
  /* Interface initialize. */
  iflist = list_new ();
  if_add_hook (IF_NEW_HOOK, ripng_if_new_hook);

  /* RIPng enable network init. */
  ripng_enable_network = route_table_init ();

  /* RIPng enable interface init. */
  ripng_enable_if = vector_init (1);

  /* RIPng passive interface. */
  Vripng_passive_interface = vector_init (1);

  /* Install interface node. */
  install_node (&interface_node, interface_config_write);

  install_element (CONFIG_NODE, &interface_cmd);
  install_element (INTERFACE_NODE, &config_end_cmd);
  install_element (INTERFACE_NODE, &config_exit_cmd);
  install_element (INTERFACE_NODE, &config_help_cmd);
  install_element (INTERFACE_NODE, &interface_desc_cmd);
  install_element (INTERFACE_NODE, &no_interface_desc_cmd);

  install_element (RIPNG_NODE, &ripng_network_cmd);
  install_element (RIPNG_NODE, &no_ripng_network_cmd);
  install_element (RIPNG_NODE, &ripng_passive_interface_cmd);
  install_element (RIPNG_NODE, &no_ripng_passive_interface_cmd);
}