path: root/zebra/zebra_vrf.c

/*
 * Copyright (C) 2016 CumulusNetworks
 *                    Donald Sharp
 *
 * This file is part of Quagga
 *
 * Quagga 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.
 *
 * Quagga 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 <zebra.h>

#include "log.h"
#include "linklist.h"
#include "command.h"
#include "memory.h"
#include "srcdest_table.h"

#include "vty.h"
#include "zebra/debug.h"
#include "zebra/zserv.h"
#include "zebra/rib.h"
#include "zebra/zebra_vrf.h"
#include "zebra/zebra_rnh.h"
#include "zebra/router-id.h"
#include "zebra/zebra_memory.h"
#include "zebra/zebra_static.h"
#include "zebra/interface.h"
#include "zebra/zebra_mpls.h"

extern struct zebra_t zebrad;

/* VRF information update. */
static void
zebra_vrf_add_update (struct zebra_vrf *zvrf)
{
  struct listnode *node, *nnode;
  struct zserv *client;

  if (IS_ZEBRA_DEBUG_EVENT)
    zlog_debug ("MESSAGE: ZEBRA_VRF_ADD %s", zvrf_name (zvrf));

  for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
    zsend_vrf_add (client, zvrf);
}

static void
zebra_vrf_delete_update (struct zebra_vrf *zvrf)
{
  struct listnode *node, *nnode;
  struct zserv *client;

  if (IS_ZEBRA_DEBUG_EVENT)
    zlog_debug ("MESSAGE: ZEBRA_VRF_DELETE %s", zvrf_name (zvrf));

  for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
    zsend_vrf_delete (client, zvrf);
}

void
zebra_vrf_update_all (struct zserv *client)
{
  struct vrf *vrf;

  RB_FOREACH (vrf, vrf_id_head, &vrfs_by_id)
    {
      if (vrf->vrf_id)
        zsend_vrf_add (client, vrf_info_lookup (vrf->vrf_id));
    }
}

/* Callback upon creating a new VRF. */
static int
zebra_vrf_new (struct vrf *vrf)
{
  struct zebra_vrf *zvrf;

  if (IS_ZEBRA_DEBUG_EVENT)
    zlog_info ("ZVRF %s with id %u", vrf->name, vrf->vrf_id);

  zvrf = zebra_vrf_alloc ();
  zvrf->zns = zebra_ns_lookup (NS_DEFAULT); /* Point to the global (single) NS */
  router_id_init (zvrf);
  vrf->info = zvrf;
  zvrf->vrf = vrf;

  return 0;
}

/*
 * Moving an interface amongst different vrf's
 * causes the interface to get a new ifindex
 * so we need to find static routes with
 * the old ifindex and replace with new
 * ifindex to insert back into the table
 */
void
zebra_vrf_static_route_interface_fixup (struct interface *ifp)
{
  afi_t afi;
  safi_t safi;
  struct zebra_vrf *zvrf = zebra_vrf_lookup_by_id (ifp->vrf_id);
  struct route_table *stable = NULL;
  struct route_node *rn = NULL;
  struct static_route *si = NULL;

  if (!zvrf)
    return;

  for (afi = AFI_IP; afi < AFI_MAX; afi++)
    {
      for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++)
        {
          stable = zvrf->stable[afi][safi];
          if (stable)
	    for (rn = route_top (stable); rn; rn = route_next (rn))
	      {
		if (rn->info)
		  {
		    si = rn->info;
		    if ((strcmp (si->ifname, ifp->name) == 0) &&
			(si->ifindex != ifp->ifindex))
		      {
			si->ifindex = ifp->ifindex;
			static_install_route (afi, safi, &rn->p, NULL, si);
		      }	  
		  }
	      }
	}
    }
  
}

/* Callback upon enabling a VRF. */
static int
zebra_vrf_enable (struct vrf *vrf)
{
  struct zebra_vrf *zvrf = vrf->info;
  struct route_table *stable;
  struct route_node *rn;
  struct static_route *si;
  struct interface *ifp;
  afi_t afi;
  safi_t safi;

  assert (zvrf);

  zebra_vrf_add_update (zvrf);

  for (afi = AFI_IP; afi < AFI_MAX; afi++)
    for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++)
      {
	stable = zvrf->stable[afi][safi];
	if (! stable)
	  continue;

	for (rn = route_top (stable); rn; rn = route_next (rn))
	  for (si = rn->info; si; si = si->next)
	    {
	      si->vrf_id = vrf->vrf_id;
	      if (si->ifindex)
		{
		  ifp = if_lookup_by_name (si->ifname, si->vrf_id);
		  if (ifp)
		    si->ifindex = ifp->ifindex;
		  else
		    continue;
		}
	      static_install_route (afi, safi, &rn->p, NULL, si);
	    }
      }

  return 0;
}

/* Callback upon disabling a VRF. */
static int
zebra_vrf_disable (struct vrf *vrf)
{
  struct zebra_vrf *zvrf = vrf->info;
  struct route_table *stable;
  struct route_node *rn;
  struct static_route *si;
  afi_t afi;
  safi_t safi;

  if (IS_ZEBRA_DEBUG_KERNEL)
    zlog_debug ("VRF %s id %u is now disabled.",
                zvrf_name (zvrf), zvrf_id (zvrf));

  for (afi = AFI_IP; afi < AFI_MAX; afi++)
    for (safi = SAFI_UNICAST ; safi < SAFI_MAX ; safi++)
      {
	stable = zvrf->stable[afi][safi];
	if (! stable)
	  continue;

	for (rn = route_top (stable); rn; rn = route_next (rn))
	  for (si = rn->info; si; si = si->next)
	    static_uninstall_route(afi, safi, &rn->p, NULL, si);
      }

  return 0;
}

static int
zebra_vrf_delete (struct vrf *vrf)
{
  struct zebra_vrf *zvrf = vrf->info;
  struct route_table *table;
  u_int32_t table_id;
  afi_t afi;
  safi_t safi;
  unsigned i;

  assert (zvrf);

  zebra_vrf_delete_update (zvrf);

  /* uninstall everything */
  if (! CHECK_FLAG (zvrf->flags, ZEBRA_VRF_RETAIN))
    {
      struct listnode *node;
      struct interface *ifp;

      for (afi = AFI_IP; afi <= AFI_IP6; afi++)
	{
	  for (safi = SAFI_UNICAST; safi <= SAFI_MULTICAST; safi++)
	    rib_close_table (zvrf->table[afi][safi]);

	  if (vrf->vrf_id == VRF_DEFAULT)
	    for (table_id = 0; table_id < ZEBRA_KERNEL_TABLE_MAX; table_id++)
	      if (zvrf->other_table[afi][table_id])
		rib_close_table (zvrf->other_table[afi][table_id]);
	}

      zebra_mpls_close_tables (zvrf);

      for (ALL_LIST_ELEMENTS_RO (vrf->iflist, node, ifp))
	if_nbr_ipv6ll_to_ipv4ll_neigh_del_all (ifp);
    }

  /* clean-up work queues */
  for (i = 0; i < MQ_SIZE; i++)
    {
      struct listnode *lnode, *nnode;
      struct route_node *rnode;
      rib_dest_t *dest;

      for (ALL_LIST_ELEMENTS (zebrad.mq->subq[i], lnode, nnode, rnode))
	{
	  dest = rib_dest_from_rnode (rnode);
	  if (dest && rib_dest_vrf (dest) == zvrf)
	    {
	      route_unlock_node (rnode);
	      list_delete_node (zebrad.mq->subq[i], lnode);
	    }
	}
    }

  /* release allocated memory */
  for (afi = AFI_IP; afi <= AFI_IP6; afi++)
    {
      void *table_info;

      for (safi = SAFI_UNICAST; safi <= SAFI_MULTICAST; safi++)
	{
	  table = zvrf->table[afi][safi];
	  table_info = table->info;
	  route_table_finish (table);
	  XFREE (MTYPE_RIB_TABLE_INFO, table_info);

	  table = zvrf->stable[afi][safi];
	  route_table_finish (table);
	}

      for (table_id = 0; table_id < ZEBRA_KERNEL_TABLE_MAX; table_id++)
	if (zvrf->other_table[afi][table_id])
	  {
	    table = zvrf->other_table[afi][table_id];
	    table_info = table->info;
	    route_table_finish (table);
	    XFREE (MTYPE_RIB_TABLE_INFO, table_info);
	  }

      route_table_finish (zvrf->rnh_table[afi]);
      route_table_finish (zvrf->import_check_table[afi]);
    }
  list_delete_all_node (zvrf->rid_all_sorted_list);
  list_delete_all_node (zvrf->rid_lo_sorted_list);
  XFREE (MTYPE_ZEBRA_VRF, zvrf);
  vrf->info = NULL;

  return 0;
}

/* Lookup the routing table in a VRF based on both VRF-Id and table-id.
 * NOTE: Table-id is relevant only in the Default VRF.
 */
struct route_table *
zebra_vrf_table_with_table_id (afi_t afi, safi_t safi,
                               vrf_id_t vrf_id, u_int32_t table_id)
{
  struct route_table *table = NULL;

  if (afi >= AFI_MAX || safi >= SAFI_MAX)
    return NULL;

  if (vrf_id == VRF_DEFAULT)
    {
      if (table_id == RT_TABLE_MAIN ||
          table_id == zebrad.rtm_table_default)
        table = zebra_vrf_table (afi, safi, vrf_id);
      else
        table = zebra_vrf_other_route_table (afi, table_id, vrf_id);
    }
  else
      table = zebra_vrf_table (afi, safi, vrf_id);

  return table;
}

static void
zebra_rtable_node_cleanup (struct route_table *table, struct route_node *node)
{
  struct rib *rib, *next;

  RNODE_FOREACH_RIB_SAFE (node, rib, next)
    rib_unlink (node, rib);

  if (node->info)
    XFREE (MTYPE_RIB_DEST, node->info);
}

static void
zebra_stable_node_cleanup (struct route_table *table, struct route_node *node)
{
  struct static_route *si, *next;

  if (node->info)
    for (si = node->info; si; si = next)
      {
	next = si->next;
	XFREE (MTYPE_STATIC_ROUTE, si);
      }
}

static void
zebra_rnhtable_node_cleanup (struct route_table *table, struct route_node *node)
{
  if (node->info)
    zebra_free_rnh (node->info);
}

/*
 * Create a routing table for the specific AFI/SAFI in the given VRF.
 */
static void
zebra_vrf_table_create (struct zebra_vrf *zvrf, afi_t afi, safi_t safi)
{
  rib_table_info_t *info;
  struct route_table *table;

  assert (!zvrf->table[afi][safi]);

  if (afi == AFI_IP6)
    table = srcdest_table_init();
  else
    table = route_table_init();
  table->cleanup = zebra_rtable_node_cleanup;
  zvrf->table[afi][safi] = table;

  info = XCALLOC (MTYPE_RIB_TABLE_INFO, sizeof (*info));
  info->zvrf = zvrf;
  info->afi = afi;
  info->safi = safi;
  table->info = info;
}

/* Allocate new zebra VRF. */
struct zebra_vrf *
zebra_vrf_alloc (void)
{
  struct zebra_vrf *zvrf;
  afi_t afi;
  safi_t safi;
  struct route_table *table;

  zvrf = XCALLOC (MTYPE_ZEBRA_VRF, sizeof (struct zebra_vrf));

  for (afi = AFI_IP; afi <= AFI_IP6; afi++)
    {
      for (safi = SAFI_UNICAST; safi <= SAFI_MULTICAST; safi++)
        {
          zebra_vrf_table_create (zvrf, afi, safi);
          if (afi == AFI_IP6)
            table = srcdest_table_init();
          else
            table = route_table_init();
          table->cleanup = zebra_stable_node_cleanup;
          zvrf->stable[afi][safi] = table;
        }

      table = route_table_init();
      table->cleanup = zebra_rnhtable_node_cleanup;
      zvrf->rnh_table[afi] = table;

      table = route_table_init();
      table->cleanup = zebra_rnhtable_node_cleanup;
      zvrf->import_check_table[afi] = table;
    }

  zebra_mpls_init_tables (zvrf);

  return zvrf;
}

/* Lookup VRF by identifier.  */
struct zebra_vrf *
zebra_vrf_lookup_by_id (vrf_id_t vrf_id)
{
  return vrf_info_lookup (vrf_id);
}

/* Lookup VRF by name.  */
struct zebra_vrf *
zebra_vrf_lookup_by_name (const char *name)
{
  struct vrf *vrf;

  if (!name)
    name = VRF_DEFAULT_NAME;

  vrf = vrf_lookup_by_name (name);
  if (vrf)
    return ((struct zebra_vrf *) vrf->info);

  return NULL;
}

/* Lookup the routing table in an enabled VRF. */
struct route_table *
zebra_vrf_table (afi_t afi, safi_t safi, vrf_id_t vrf_id)
{
  struct zebra_vrf *zvrf = vrf_info_lookup (vrf_id);

  if (!zvrf)
    return NULL;

  if (afi >= AFI_MAX || safi >= SAFI_MAX)
    return NULL;

  return zvrf->table[afi][safi];
}

/* Lookup the static routing table in a VRF. */
struct route_table *
zebra_vrf_static_table (afi_t afi, safi_t safi, struct zebra_vrf *zvrf)
{
  if (!zvrf)
    return NULL;

  if (afi >= AFI_MAX || safi >= SAFI_MAX)
    return NULL;

  return zvrf->stable[afi][safi];
}

struct route_table *
zebra_vrf_other_route_table (afi_t afi, u_int32_t table_id, vrf_id_t vrf_id)
{
  struct zebra_vrf *zvrf;
  rib_table_info_t *info;
  struct route_table *table;

  zvrf = vrf_info_lookup (vrf_id);
  if (! zvrf)
    return NULL;

  if(afi >= AFI_MAX)
    return NULL;

  if (table_id >= ZEBRA_KERNEL_TABLE_MAX)
    return NULL;

  if ((vrf_id == VRF_DEFAULT) && (table_id != RT_TABLE_MAIN) && (table_id != zebrad.rtm_table_default))
    {
      if (zvrf->other_table[afi][table_id] == NULL)
        {
          table = (afi == AFI_IP6) ? srcdest_table_init() : route_table_init();
          info = XCALLOC (MTYPE_RIB_TABLE_INFO, sizeof (*info));
          info->zvrf = zvrf;
          info->afi = afi;
          info->safi = SAFI_UNICAST;
          table->info = info;
          zvrf->other_table[afi][table_id] = table;
        }

      return (zvrf->other_table[afi][table_id]);
    }

  return zvrf->table[afi][SAFI_UNICAST];
}

static int
vrf_config_write (struct vty *vty)
{
  struct vrf *vrf;
  struct zebra_vrf *zvrf;

  RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name)
    {
      zvrf = vrf->info;
      if (! zvrf || strcmp (zvrf_name (zvrf), VRF_DEFAULT_NAME))
        {
          vty_out (vty, "vrf %s%s", zvrf_name (zvrf), VTY_NEWLINE);
          vty_out (vty, "!%s", VTY_NEWLINE);
        }
    }
  return 0;
}

/* Zebra VRF initialization. */
void
zebra_vrf_init (void)
{
  vrf_add_hook (VRF_NEW_HOOK, zebra_vrf_new);
  vrf_add_hook (VRF_ENABLE_HOOK, zebra_vrf_enable);
  vrf_add_hook (VRF_DISABLE_HOOK, zebra_vrf_disable);
  vrf_add_hook (VRF_DELETE_HOOK, zebra_vrf_delete);

  vrf_init ();
  vrf_cmd_init (vrf_config_write);
}