ospf6_zebra.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

/*
 * Copyright (C) 1999 Yasuhiro Ohara
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Zebra; see the file COPYING.  If not, write to the 
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 
 * Boston, MA 02111-1307, USA.  
 */

#include "ospf6d.h"

#include "ospf6_interface.h"
#include "ospf6_asbr.h"

#include "ospf6_linklist.h"

/* information about zebra. */
struct zclient *zclient = NULL;

/* redistribute function */
void
ospf6_zebra_redistribute (int type)
{
  int top_change = 0;

  if (zclient->redist[type])
    return;

  if (! ospf6_is_asbr (ospf6))
    top_change = 1;

  zclient->redist[type] = 1;

  if (zclient->sock > 0)
    zebra_redistribute_send (ZEBRA_REDISTRIBUTE_ADD, zclient->sock, type);

  if (top_change)
    CALL_CHANGE_HOOK (&top_hook, ospf6);
}

void
ospf6_zebra_no_redistribute (int type)
{
  int top_change = 0;

  if (!zclient->redist[type])
    return;

  if (ospf6_is_asbr (ospf6))
    top_change = 1;

  zclient->redist[type] = 0;

  if (zclient->sock > 0)
    zebra_redistribute_send (ZEBRA_REDISTRIBUTE_DELETE, zclient->sock, type);

  if (top_change)
    CALL_CHANGE_HOOK (&top_hook, ospf6);
}

int
ospf6_zebra_is_redistribute (int type)
{
  return zclient->redist[type];
}


/* Inteface addition message from zebra. */
int
ospf6_zebra_if_add (int command, struct zclient *zclient, zebra_size_t length)
{
  struct interface *ifp;

  ifp = zebra_interface_add_read (zclient->ibuf);

  /* log */
  if (IS_OSPF6_DUMP_ZEBRA)
    zlog_info ("ZEBRA: I/F add: %s index %d mtu %d",
               ifp->name, ifp->ifindex, ifp->mtu);

  ospf6_interface_if_add (ifp);

  return 0;
}

int
ospf6_zebra_if_del (int command, struct zclient *zclient, zebra_size_t length)
{
#if 0
  struct interface *ifp = NULL;

  ifp = zebra_interface_delete_read (zclient->ibuf);

  /* log */
  if (IS_OSPF6_DUMP_ZEBRA)
    zlog_info ("ZEBRA: I/F delete: %s index %d mtu %d",
               ifp->name, ifp->ifindex, ifp->mtu);

  ospf6_interface_if_del (ifp);
#endif

  return 0;
}

int
ospf6_zebra_if_state_update (int command, struct zclient *zclient,
                             zebra_size_t length)
{
  struct interface *ifp;

  ifp = zebra_interface_state_read (zclient->ibuf);

  /* log */
  if (IS_OSPF6_DUMP_ZEBRA)
    zlog_info ("ZEBRA: I/F %s state change: index %d flags %ld metric %d mtu %d",
               ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu);

  ospf6_interface_state_update (ifp);
  return 0;
}

int
ospf6_zebra_if_address_update_add (int command, struct zclient *zclient,
				   zebra_size_t length)
{
  struct connected *c;
  char buf[128];

  c = zebra_interface_address_add_read (zclient->ibuf);
  if (c == NULL)
    return 0;

  if (IS_OSPF6_DUMP_ZEBRA)
    zlog_info ("ZEBRA: I/F %s address add: %5s %s/%d",
               c->ifp->name, prefix_family_str (c->address),
               inet_ntop (c->address->family, &c->address->u.prefix,
                          buf, sizeof (buf)), c->address->prefixlen);

  if (c->address->family == AF_INET6)
    ospf6_interface_address_update (c->ifp);

  return 0;
}

int
ospf6_zebra_if_address_update_delete (int command, struct zclient *zclient,
				      zebra_size_t length)
{
  struct connected *c;
  char buf[128];

  c = zebra_interface_address_delete_read (zclient->ibuf);
  if (c == NULL)
    return 0;

  if (IS_OSPF6_DUMP_ZEBRA)
    zlog_info ("ZEBRA: I/F %s address del: %5s %s/%d",
               c->ifp->name, prefix_family_str (c->address),
               inet_ntop (c->address->family, &c->address->u.prefix,
                          buf, sizeof (buf)), c->address->prefixlen);

  if (c->address->family == AF_INET6)
    ospf6_interface_address_update (c->ifp);

  return 0;
}



const char *zebra_route_name[ZEBRA_ROUTE_MAX] =
  {
    "System",
    "Kernel",
    "Connect",
    "Static",
    "RIP",
    "RIPng",
    "OSPF",
    "OSPF6",
    "BGP",
  };

const char *zebra_route_abname[ZEBRA_ROUTE_MAX] =
  { "X", "K", "C", "S", "r", "R", "o", "O", "B" };

int
ospf6_zebra_read_ipv6 (int command, struct zclient *zclient,
                       zebra_size_t length)
{
  struct stream *s;
  struct zapi_ipv6 api;
  unsigned long ifindex;
  struct prefix_ipv6 p;
  struct in6_addr *nexthop;
  char prefixstr[128], nexthopstr[128];

  s = zclient->ibuf;
  ifindex = 0;
  nexthop = NULL;
  memset (&api, 0, sizeof (api));

  /* Type, flags, message. */
  api.type = stream_getc (s);
  api.flags = stream_getc (s);
  api.message = stream_getc (s);

  /* IPv6 prefix. */
  memset (&p, 0, sizeof (struct prefix_ipv6));
  p.family = AF_INET6;
  p.prefixlen = stream_getc (s);
  stream_get (&p.prefix, s, PSIZE (p.prefixlen));

  /* Nexthop, ifindex, distance, metric. */
  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP))
    {
      api.nexthop_num = stream_getc (s);
      nexthop = (struct in6_addr *)
        malloc (api.nexthop_num * sizeof (struct in6_addr));
      stream_get (nexthop, s, api.nexthop_num * sizeof (struct in6_addr));
    }
  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_IFINDEX))
    {
      api.ifindex_num = stream_getc (s);
      ifindex = stream_getl (s);
    }
  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_DISTANCE))
    api.distance = stream_getc (s);
  else
    api.distance = 0;
  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_METRIC))
    api.metric = stream_getl (s);
  else
    api.metric = 0;

  /* log */
  if (IS_OSPF6_DUMP_ZEBRA)
    {
      prefix2str ((struct prefix *)&p, prefixstr, sizeof (prefixstr));
      inet_ntop (AF_INET6, &nexthop, nexthopstr, sizeof (nexthopstr));

      if (command == ZEBRA_IPV6_ROUTE_ADD)
	zlog_info ("ZEBRA: Receive add %s route: %s nexthop:%s ifindex:%ld",
		   zebra_route_name [api.type], prefixstr,
		   nexthopstr, ifindex);
      else
	zlog_info ("ZEBRA: Receive remove %s route: %s nexthop:%s ifindex:%ld",
		   zebra_route_name [api.type], prefixstr,
		   nexthopstr, ifindex);
    }
 
  if (command == ZEBRA_IPV6_ROUTE_ADD)
    ospf6_asbr_route_add (api.type, ifindex, (struct prefix *) &p,
                          api.nexthop_num, nexthop);
  else
    ospf6_asbr_route_remove (api.type, ifindex, (struct prefix *) &p);

  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP))
    free (nexthop);

  return 0;
}


DEFUN (show_zebra,
       show_zebra_cmd,
       "show zebra",
       SHOW_STR
       "Zebra information\n")
{
  int i;
  if (!zclient)
    vty_out (vty, "Not connected to zebra%s", VTY_NEWLINE);

  vty_out (vty, "Zebra Infomation%s", VTY_NEWLINE);
  vty_out (vty, "  enable: %d%s", zclient->enable, VTY_NEWLINE);
  vty_out (vty, "  fail: %d%s", zclient->fail, VTY_NEWLINE);
  vty_out (vty, "  redistribute default: %d%s", zclient->redist_default,
           VTY_NEWLINE);
  for (i = 0; i < ZEBRA_ROUTE_MAX; i++)
    vty_out (vty, "    RouteType: %s - %s%s", zebra_route_name[i],
             zclient->redist[i] ? "redistributed" : "not redistributed",
             VTY_NEWLINE);
  return CMD_SUCCESS;
}

DEFUN (router_zebra,
       router_zebra_cmd,
       "router zebra",
       "Enable a routing process\n"
       "Make connection to zebra daemon\n")
{
  if (IS_OSPF6_DUMP_CONFIG)
    zlog_info ("Config: router zebra");

  vty->node = ZEBRA_NODE;
  zclient->enable = 1;
  zclient_start (zclient);
  return CMD_SUCCESS;
}

DEFUN (no_router_zebra,
       no_router_zebra_cmd,
       "no router zebra",
       NO_STR
       "Configure routing process\n"
       "Disable connection to zebra daemon\n")
{
  if (IS_OSPF6_DUMP_CONFIG)
    zlog_info ("no router zebra");

  zclient->enable = 0;
  zclient_stop (zclient);
  return CMD_SUCCESS;
}

/* Zebra configuration write function. */
int
ospf6_zebra_config_write (struct vty *vty)
{
  if (! zclient->enable)
    {
      vty_out (vty, "no router zebra%s", VTY_NEWLINE);
      return 1;
    }
  else if (! zclient->redist[ZEBRA_ROUTE_OSPF6])
    {
      vty_out (vty, "router zebra%s", VTY_NEWLINE);
      vty_out (vty, " no redistribute ospf6%s", VTY_NEWLINE);
      return 1;
    }
  return 0;
}

/* Zebra node structure. */
struct cmd_node zebra_node =
  {
    ZEBRA_NODE,
    "%s(config-zebra)# ",
    0
  };

#define ADD    0
#define CHANGE 1
#define REMOVE 2

static void
ospf6_zebra_route_update (int type, struct ospf6_route_req *request)
{
  char buf[96], ifname[IFNAMSIZ];

  struct zapi_ipv6 api;
  struct ospf6_route_req route;
  struct linklist *nexthop_list;