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

      listnode_add (ifp->connected, ifc);
    }

  /* This address is configured from zebra. */
  if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED))
    SET_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED);

  /* In case of this route need to install kernel. */
  if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL)
      && CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE))
    {
      /* Some system need to up the interface to set IP address. */
      if (! if_is_up (ifp))
	{
	  if_set_flags (ifp, IFF_UP | IFF_RUNNING);
	  if_refresh (ifp);
	}

      ret = if_set_prefix (ifp, ifc);
      if (ret < 0)
	{
	  vty_out (vty, "%% Can't set interface IP address: %s.%s", 
		   strerror(errno), VTY_NEWLINE);
	  return CMD_WARNING;
	}

      /* IP address propery set. */
      SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);

      /* Update interface address information to protocol daemon. */
      zebra_interface_address_add_update (ifp, ifc);

      /* If interface is up register connected route. */
      if (if_is_up(ifp))
	connected_up_ipv4 (ifp, ifc);
    }

  return CMD_SUCCESS;
}

int
ip_address_uninstall (struct vty *vty, struct interface *ifp, char *addr_str,
		      char *peer_str, char *label, int secondry)
{
  struct prefix_ipv4 cp;
  struct connected *ifc;
  int ret;

  /* Convert to prefix structure. */
  ret = str2prefix_ipv4 (addr_str, &cp);
  if (ret <= 0)
    {
      vty_out (vty, "%% Malformed address %s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Check current interface address. */
  ifc = connected_check_ipv4 (ifp, (struct prefix *) &cp);
  if (! ifc)
    {
      vty_out (vty, "%% Can't find address%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* This is not configured address. */
  if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED))
    return CMD_WARNING;

  /* This is not real address or interface is not active. */
  if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL)
      || ! CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE))
    {
      listnode_delete (ifp->connected, ifc);
      connected_free (ifc);
      return CMD_WARNING;
    }

  /* This is real route. */
  ret = if_unset_prefix (ifp, ifc);
  if (ret < 0)
    {
      vty_out (vty, "%% Can't unset interface IP address: %s.%s", 
	       strerror(errno), VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Redistribute this information. */
  zebra_interface_address_delete_update (ifp, ifc);

  /* Remove connected route. */
  connected_down_ipv4 (ifp, ifc);

  /* Free address information. */
  listnode_delete (ifp->connected, ifc);
  connected_free (ifc);

  return CMD_SUCCESS;
}

DEFUN (ip_address,
       ip_address_cmd,
       "ip address A.B.C.D/M",
       "Interface Internet Protocol config commands\n"
       "Set the IP address of an interface\n"
       "IP address (e.g. 10.0.0.1/8)\n")
{
  return ip_address_install (vty, vty->index, argv[0], NULL, NULL, 0);
}

DEFUN (no_ip_address,
       no_ip_address_cmd,
       "no ip address A.B.C.D/M",
       NO_STR
       "Interface Internet Protocol config commands\n"
       "Set the IP address of an interface\n"
       "IP Address (e.g. 10.0.0.1/8)")
{
  return ip_address_uninstall (vty, vty->index, argv[0], NULL, NULL, 0);
}

#ifdef HAVE_NETLINK
DEFUN (ip_address_secondary,
       ip_address_secondary_cmd,
       "ip address A.B.C.D/M secondary",
       "Interface Internet Protocol config commands\n"
       "Set the IP address of an interface\n"
       "IP address (e.g. 10.0.0.1/8)\n"
       "Secondary IP address\n")
{
  return ip_address_install (vty, vty->index, argv[0], NULL, NULL, 1);
}

DEFUN (ip_address_label,
       ip_address_label_cmd,
       "ip address A.B.C.D/M label LINE",
       "Interface Internet Protocol config commands\n"
       "Set the IP address of an interface\n"
       "IP address (e.g. 10.0.0.1/8)\n"
       "Label of this address\n"
       "Label\n")
{
  return ip_address_install (vty, vty->index, argv[0], NULL, argv[1], 1);
}

DEFUN (no_ip_address_secondary,
       no_ip_address_secondary_cmd,
       "no ip address A.B.C.D/M secondary",
       NO_STR
       "Interface Internet Protocol config commands\n"
       "Set the IP address of an interface\n"
       "IP address (e.g. 10.0.0.1/8)\n"
       "Secondary IP address\n")
{
  return ip_address_uninstall (vty, vty->index, argv[0], NULL, NULL, 1);
}

DEFUN (no_ip_address_label,
       no_ip_address_label_cmd,
       "no ip address A.B.C.D/M label LINE",
       NO_STR
       "Interface Internet Protocol config commands\n"
       "Set the IP address of an interface\n"
       "IP address (e.g. 10.0.0.1/8)\n"
       "Label of this address\n"
       "Label\n")
{
  return ip_address_uninstall (vty, vty->index, argv[0], NULL, argv[1], 1);
}
#endif /* HAVE_NETLINK */

#ifdef HAVE_IPV6
int
ipv6_address_install (struct vty *vty, struct interface *ifp, char *addr_str,
		      char *peer_str, char *label, int secondary)
{
  struct prefix_ipv6 cp;
  struct connected *ifc;
  struct prefix_ipv6 *p;
  int ret;

  ret = str2prefix_ipv6 (addr_str, &cp);
  if (ret <= 0)
    {
      vty_out (vty, "%% Malformed address %s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  ifc = connected_check_ipv6 (ifp, (struct prefix *) &cp);
  if (! ifc)
    {
      ifc = connected_new ();
      ifc->ifp = ifp;

      /* Address. */
      p = prefix_ipv6_new ();
      *p = cp;
      ifc->address = (struct prefix *) p;

      /* Secondary. */
      if (secondary)
	SET_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY);

      /* Label. */
      if (label)
	ifc->label = strdup (label);

      /* Add to linked list. */
      listnode_add (ifp->connected, ifc);
    }

  /* This address is configured from zebra. */
  if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED))
    SET_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED);

  /* In case of this route need to install kernel. */
  if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL)
      && CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE))
    {
      /* Some system need to up the interface to set IP address. */
      if (! if_is_up (ifp))
	{
	  if_set_flags (ifp, IFF_UP | IFF_RUNNING);
	  if_refresh (ifp);
	}

      ret = if_prefix_add_ipv6 (ifp, ifc);

      if (ret < 0)
	{
	  vty_out (vty, "%% Can't set interface IP address: %s.%s", 
		   strerror(errno), VTY_NEWLINE);
	  return CMD_WARNING;
	}

      /* IP address propery set. */
      SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);

      /* Update interface address information to protocol daemon. */
      zebra_interface_address_add_update (ifp, ifc);

      /* If interface is up register connected route. */
      if (if_is_up(ifp))
	connected_up_ipv6 (ifp, ifc);
    }

  return CMD_SUCCESS;
}

int
ipv6_address_uninstall (struct vty *vty, struct interface *ifp, char *addr_str,
			char *peer_str, char *label, int secondry)
{
  struct prefix_ipv6 cp;
  struct connected *ifc;
  int ret;

  /* Convert to prefix structure. */
  ret = str2prefix_ipv6 (addr_str, &cp);
  if (ret <= 0)
    {
      vty_out (vty, "%% Malformed address %s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Check current interface address. */
  ifc = connected_check_ipv6 (ifp, (struct prefix *) &cp);
  if (! ifc)
    {
      vty_out (vty, "%% Can't find address%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* This is not configured address. */
  if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED))
    return CMD_WARNING;

  /* This is not real address or interface is not active. */
  if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL)
      || ! CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE))
    {
      listnode_delete (ifp->connected, ifc);
      connected_free (ifc);
      return CMD_WARNING;
    }

  /* This is real route. */
  ret = if_prefix_delete_ipv6 (ifp, ifc);
  if (ret < 0)
    {
      vty_out (vty, "%% Can't unset interface IP address: %s.%s", 
	       strerror(errno), VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Redistribute this information. */
  zebra_interface_address_delete_update (ifp, ifc);

  /* Remove connected route. */
  connected_down_ipv6 (ifp, ifc);

  /* Free address information. */
  listnode_delete (ifp->connected, ifc);
  connected_free (ifc);

  return CMD_SUCCESS;
}

DEFUN (ipv6_address,
       ipv6_address_cmd,
       "ipv6 address X:X::X:X/M",
       "Interface Internet Protocol config commands\n"
       "Set the IP address of an interface\n"
       "IPv6 address (e.g. 3ffe:506::1/48)\n")
{
  return ipv6_address_install (vty, vty->index, argv[0], NULL, NULL, 0);
}

DEFUN (no_ipv6_address,
       no_ipv6_address_cmd,
       "no ipv6 address X:X::X:X/M",
       NO_STR
       "Interface Internet Protocol config commands\n"
       "Set the IP address of an interface\n"
       "IPv6 address (e.g. 3ffe:506::1/48)\n")
{
  return ipv6_address_uninstall (vty, vty->index, argv[0], NULL, NULL, 0);
}
#endif /* HAVE_IPV6 */

#ifdef KAME
DEFUN (ip_tunnel,
       ip_tunnel_cmd,
       "ip tunnel IP_address IP_address",
       "KAME ip tunneling configuration commands\n"
       "Set FROM IP address and TO IP address\n")
{
  return CMD_SUCCESS;
}

DEFUN (no_ip_tunnel, no_ip_tunnel_cmd,
       "no ip tunnel",
       NO_STR
       "Set FROM IP address and TO IP address\n")
{
  return CMD_SUCCESS;
}
#endif /* KAME */

int
if_config_write (struct vty *vty)
{
  listnode node;
  struct interface *ifp;
  char buf[BUFSIZ];

  for (node = listhead (iflist); node; nextnode (node))
    {
      struct zebra_if *if_data;
      listnode addrnode;
      struct connected *ifc;
      struct prefix *p;

      ifp = getdata (node);
      if_data = 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);

      /* Assign bandwidth here to avoid unnecessary interface flap
	 while processing config script */
      if (ifp->bandwidth != 0)
	vty_out(vty, " bandwidth %u%s", ifp->bandwidth, VTY_NEWLINE); 

      for (addrnode = listhead (ifp->connected); addrnode; nextnode (addrnode))
	  {
	    ifc = getdata (addrnode);
	    if (CHECK_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED))
	      {
		p = ifc->address;
		vty_out (vty, " ip%s address %s/%d",
			 p->family == AF_INET ? "" : "v6",
			 inet_ntop (p->family, &p->u.prefix, buf, BUFSIZ),
			 p->prefixlen);

		if (CHECK_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY))
		  vty_out (vty, " secondary");
		  
		if (ifc->label)
		  vty_out (vty, " label %s", ifc->label);

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

      if (if_data)
	{
	  if (if_data->shutdown == IF_ZEBRA_SHUTDOWN_ON)
	    vty_out (vty, " shutdown%s", VTY_NEWLINE);

	  if (if_data->multicast != IF_ZEBRA_MULTICAST_UNSPEC)
	    vty_out (vty, " %smulticast%s",
		     if_data->multicast == IF_ZEBRA_MULTICAST_ON ? "" : "no ",
		     VTY_NEWLINE);
	}

#ifdef RTADV
      rtadv_config_write (vty, ifp);
#endif /* RTADV */

      vty_out (vty, "!%s", VTY_NEWLINE);
    }
  return 0;
}

/* Allocate and initialize interface vector. */
void
zebra_if_init ()
{
  /* Initialize interface and new hook. */
  if_init ();
  if_add_hook (IF_NEW_HOOK, if_zebra_new_hook);
  if_add_hook (IF_DELETE_HOOK, if_zebra_delete_hook);
  
  /* Install configuration write function. */
  install_node (&interface_node, if_config_write);

  install_element (VIEW_NODE, &show_interface_cmd);
  install_element (ENABLE_NODE, &show_interface_cmd);
  install_element (CONFIG_NODE, &zebra_interface_cmd);
  install_element (CONFIG_NODE, &no_zebra_interface_cmd);
  install_default (INTERFACE_NODE);
  install_element (INTERFACE_NODE, &interface_desc_cmd);
  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, &shutdown_if_cmd);
  install_element (INTERFACE_NODE, &no_shutdown_if_cmd);
  install_element (INTERFACE_NODE, &bandwidth_if_cmd);
  install_element (INTERFACE_NODE, &no_bandwidth_if_cmd);
  install_element (INTERFACE_NODE, &no_bandwidth_if_val_cmd);
  install_element (INTERFACE_NODE, &ip_address_cmd);
  install_element (INTERFACE_NODE, &no_ip_address_cmd);
#ifdef HAVE_IPV6
  install_element (INTERFACE_NODE, &ipv6_address_cmd);
  install_element (INTERFACE_NODE, &no_ipv6_address_cmd);
#endif /* HAVE_IPV6 */
#ifdef KAME
  install_element (INTERFACE_NODE, &ip_tunnel_cmd);
  install_element (INTERFACE_NODE, &no_ip_tunnel_cmd);
#endif /* KAME */
#ifdef HAVE_NETLINK
  install_element (INTERFACE_NODE, &ip_address_secondary_cmd);
  install_element (INTERFACE_NODE, &ip_address_label_cmd);
  install_element (INTERFACE_NODE, &no_ip_address_secondary_cmd);
  install_element (INTERFACE_NODE, &no_ip_address_label_cmd);
#endif /* HAVE_NETLINK */
}