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/*
* 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"
#include "zebra/zebra_vxlan.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));
zebra_vxlan_if_add (ifp);
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;
zebra_vxlan_if_update (ifp, ZEBRA_VXLIF_LOCAL_IP_CHANGE);
}
/*
* 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;
vlanid_t old_access_vlan;
zif = ifp->info;
assert(zif);
old_access_vlan = zif->l2info.vxl.access_vlan;
if (old_access_vlan == access_vlan)
return;
zif->l2info.vxl.access_vlan = access_vlan;
zebra_vxlan_if_update (ifp, ZEBRA_VXLIF_VLAN_CHANGE);
}
/*
* Handle VxLAN interface delete.
*/
void
zebra_l2_vxlanif_del (struct interface *ifp)
{
zebra_vxlan_if_del (ifp);
}
/*
* 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);
/* In the case of VxLAN, invoke the handler for EVPN. */
if (zif->zif_type == ZEBRA_IF_VXLAN)
zebra_vxlan_if_update (ifp, ZEBRA_VXLIF_MASTER_CHANGE);
}
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