frr/zebra/zebra_l2.c

/*
 * Zebra Layer-2 interface handling code
 * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
 *
 * This file is part of FRR.
 *
 * FRR 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.
 *
 * FRR 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 FRR; 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 "if.h"
#include "prefix.h"
#include "table.h"
#include "memory.h"
#include "log.h"
#include "linklist.h"
#include "stream.h"
#include "hash.h"
#include "jhash.h"

#include "zebra/rib.h"
#include "zebra/rt.h"
#include "zebra/zebra_ns.h"
#include "zebra/zserv.h"
#include "zebra/debug.h"
#include "zebra/interface.h"
#include "zebra/zebra_memory.h"
#include "zebra/zebra_vrf.h"
#include "zebra/rt_netlink.h"
#include "zebra/zebra_l2.h"

/* definitions */

/* static function declarations */

/* Private functions */
static void
map_slaves_to_bridge (struct interface *br_if, int link)
{
  struct vrf *vrf;
  struct listnode *node;
  struct interface *ifp;

  RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name)
    {
      for (ALL_LIST_ELEMENTS_RO (vrf->iflist, node, ifp))
        {
          struct zebra_if *zif;
          struct zebra_l2info_brslave *br_slave;

          if (ifp->ifindex == IFINDEX_INTERNAL ||
              !ifp->info)
            continue;
          if (!IS_ZEBRA_IF_BRIDGE_SLAVE (ifp))
            continue;

          /* NOTE: This assumes 'zebra_l2info_brslave' is the first field
           * for any L2 interface.
           */
          zif = (struct zebra_if *) ifp->info;
          br_slave = &zif->brslave_info;

          if (link)
            {
              if (br_slave->bridge_ifindex == br_if->ifindex)
                br_slave->br_if = br_if;
            }
          else
            {
              if (br_slave->br_if == br_if)
                br_slave->br_if = NULL;
            }
        }
    }
}

/* Public functions */
void
zebra_l2_map_slave_to_bridge (struct zebra_l2info_brslave *br_slave)
{
  struct interface *br_if;

  /* TODO: Handle change of master */
  br_if = if_lookup_by_index_per_ns (zebra_ns_lookup (NS_DEFAULT),
                                     br_slave->bridge_ifindex);
  if (br_if)
    br_slave->br_if = br_if;
}

void
zebra_l2_unmap_slave_from_bridge (struct zebra_l2info_brslave *br_slave)
{
  br_slave->br_if = NULL;
}

/*
 * Handle Bridge interface add or update. Update relevant info,
 * map slaves (if any) to the bridge.
 */
void
zebra_l2_bridge_add_update (struct interface *ifp,
                            struct zebra_l2info_bridge *bridge_info,
                            int add)
{
  struct zebra_if *zif;

  zif = ifp->info;
  assert(zif);

  /* Copy over the L2 information. */
  memcpy (&zif->l2info.br, bridge_info, sizeof (*bridge_info));

  /* Link all slaves to this bridge */
  map_slaves_to_bridge (ifp, 1);
}

/*
 * Handle Bridge interface delete.
 */
void
zebra_l2_bridge_del (struct interface *ifp)
{
  /* Unlink all slaves to this bridge */
  map_slaves_to_bridge (ifp, 0);
}

/*
 * Update L2 info for a VLAN interface. Only relevant parameter is the
 * VLAN Id and this cannot change.
 */
void
zebra_l2_vlanif_update (struct interface *ifp,
                        struct zebra_l2info_vlan *vlan_info)
{
  struct zebra_if *zif;

  zif = ifp->info;
  assert(zif);

  /* Copy over the L2 information. */
  memcpy (&zif->l2info.vl, vlan_info, sizeof (*vlan_info));
}

/*
 * Update L2 info for a VxLAN interface. This is called upon interface
 * addition as well as update. Upon add, need to invoke the VNI create
 * function. Upon update, the params of interest are the local tunnel
 * IP and VLAN mapping, but the latter is handled separately.
 */
void
zebra_l2_vxlanif_add_update (struct interface *ifp,
                             struct zebra_l2info_vxlan *vxlan_info,
                             int add)
{
  struct zebra_if *zif;
  struct in_addr old_vtep_ip;

  zif = ifp->info;
  assert(zif);

  if (add)
    {
      memcpy (&zif->l2info.vxl, vxlan_info, sizeof (*vxlan_info));
      return;
    }

  old_vtep_ip = zif->l2info.vxl.vtep_ip;
  if (IPV4_ADDR_SAME(&old_vtep_ip, &vxlan_info->vtep_ip))
    return;

  zif->l2info.vxl.vtep_ip = vxlan_info->vtep_ip;
}

/*
 * Handle change to VLAN to VNI mapping.
 */
void
zebra_l2_vxlanif_update_access_vlan (struct interface *ifp,
                                     vlanid_t access_vlan)
{
  struct zebra_if *zif;

  zif = ifp->info;
  assert(zif);

  zif->l2info.vxl.access_vlan = access_vlan;
}

/*
 * Handle VxLAN interface delete.
 */
void
zebra_l2_vxlanif_del (struct interface *ifp)
{
  /* No action currently. */
}

/*
 * Map or unmap interface from bridge.
 * NOTE: It is currently assumped that an interface has to be unmapped
 * from a bridge before it can be mapped to another bridge.
 */
void
zebra_l2if_update_bridge_slave (struct interface *ifp,
                                ifindex_t bridge_ifindex)
{
  struct zebra_if *zif;
  ifindex_t old_bridge_ifindex;

  zif = ifp->info;
  assert(zif);

  old_bridge_ifindex = zif->brslave_info.bridge_ifindex;
  if (old_bridge_ifindex == bridge_ifindex)
    return;

  zif->brslave_info.bridge_ifindex = bridge_ifindex;

  /* Set up or remove link with master */
  if (bridge_ifindex != IFINDEX_INTERNAL)
    zebra_l2_map_slave_to_bridge (&zif->brslave_info);
  else if (old_bridge_ifindex != IFINDEX_INTERNAL)
    zebra_l2_unmap_slave_from_bridge (&zif->brslave_info);
}