zebra/zebra_l2.c

   1 /*
   2  * Zebra Layer-2 interface handling code
   3  * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
   4  *
   5  * This file is part of FRR.
   6  *
   7  * FRR is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * FRR is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with FRR; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "if.h"
  26 #include "prefix.h"
  27 #include "table.h"
  28 #include "memory.h"
  29 #include "log.h"
  30 #include "linklist.h"
  31 #include "stream.h"
  32 #include "hash.h"
  33 #include "jhash.h"
  34
  35 #include "zebra/rib.h"
  36 #include "zebra/rt.h"
  37 #include "zebra/zebra_ns.h"
  38 #include "zebra/zserv.h"
  39 #include "zebra/debug.h"
  40 #include "zebra/interface.h"
  41 #include "zebra/zebra_memory.h"
  42 #include "zebra/zebra_vrf.h"
  43 #include "zebra/rt_netlink.h"
  44 #include "zebra/zebra_l2.h"
  45 #include "zebra/zebra_vxlan.h"
  46
  47 /* definitions */
  48
  49 /* static function declarations */
  50
  51 /* Private functions */
  52 static void map_slaves_to_bridge(struct interface *br_if, int link)
  53 {
  54         struct vrf *vrf;
  55         struct listnode *node;
  56         struct interface *ifp;
  57
  58         RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
  59                 for (ALL_LIST_ELEMENTS_RO(vrf->iflist, node, ifp)) {
  60                         struct zebra_if *zif;
  61                         struct zebra_l2info_brslave *br_slave;
  62
  63                         if (ifp->ifindex == IFINDEX_INTERNAL || !ifp->info)
  64                                 continue;
  65                         if (!IS_ZEBRA_IF_BRIDGE_SLAVE(ifp))
  66                                 continue;
  67
  68                         /* NOTE: This assumes 'zebra_l2info_brslave' is the
  69                          * first field
  70                          * for any L2 interface.
  71                          */
  72                         zif = (struct zebra_if *)ifp->info;
  73                         br_slave = &zif->brslave_info;
  74
  75                         if (link) {
  76                                 if (br_slave->bridge_ifindex == br_if->ifindex)
  77                                         br_slave->br_if = br_if;
  78                         } else {
  79                                 if (br_slave->br_if == br_if)
  80                                         br_slave->br_if = NULL;
  81                         }
  82                 }
  83         }
  84 }
  85
  86 /* Public functions */
  87 void zebra_l2_map_slave_to_bridge(struct zebra_l2info_brslave *br_slave)
  88 {
  89         struct interface *br_if;
  90
  91         /* TODO: Handle change of master */
  92         br_if = if_lookup_by_index_per_ns(zebra_ns_lookup(NS_DEFAULT),
  93                                           br_slave->bridge_ifindex);
  94         if (br_if)
  95                 br_slave->br_if = br_if;
  96 }
  97
  98 void zebra_l2_unmap_slave_from_bridge(struct zebra_l2info_brslave *br_slave)
  99 {
 100         br_slave->br_if = NULL;
 101 }
 102
 103 /*
 104  * Handle Bridge interface add or update. Update relevant info,
 105  * map slaves (if any) to the bridge.
 106  */
 107 void zebra_l2_bridge_add_update(struct interface *ifp,
 108                                 struct zebra_l2info_bridge *bridge_info,
 109                                 int add)
 110 {
 111         struct zebra_if *zif;
 112
 113         zif = ifp->info;
 114         assert(zif);
 115
 116         /* Copy over the L2 information. */
 117         memcpy(&zif->l2info.br, bridge_info, sizeof(*bridge_info));
 118
 119         /* Link all slaves to this bridge */
 120         map_slaves_to_bridge(ifp, 1);
 121 }
 122
 123 /*
 124  * Handle Bridge interface delete.
 125  */
 126 void zebra_l2_bridge_del(struct interface *ifp)
 127 {
 128         /* Unlink all slaves to this bridge */
 129         map_slaves_to_bridge(ifp, 0);
 130 }
 131
 132 /*
 133  * Update L2 info for a VLAN interface. Only relevant parameter is the
 134  * VLAN Id and this cannot change.
 135  */
 136 void zebra_l2_vlanif_update(struct interface *ifp,
 137                             struct zebra_l2info_vlan *vlan_info)
 138 {
 139         struct zebra_if *zif;
 140
 141         zif = ifp->info;
 142         assert(zif);
 143
 144         /* Copy over the L2 information. */
 145         memcpy(&zif->l2info.vl, vlan_info, sizeof(*vlan_info));
 146 }
 147
 148 /*
 149  * Update L2 info for a VxLAN interface. This is called upon interface
 150  * addition as well as update. Upon add, need to invoke the VNI create
 151  * function. Upon update, the params of interest are the local tunnel
 152  * IP and VLAN mapping, but the latter is handled separately.
 153  */
 154 void zebra_l2_vxlanif_add_update(struct interface *ifp,
 155                                  struct zebra_l2info_vxlan *vxlan_info, int add)
 156 {
 157         struct zebra_if *zif;
 158         struct in_addr old_vtep_ip;
 159
 160         zif = ifp->info;
 161         assert(zif);
 162
 163         if (add) {
 164                 memcpy(&zif->l2info.vxl, vxlan_info, sizeof(*vxlan_info));
 165                 zebra_vxlan_if_add(ifp);
 166                 return;
 167         }
 168
 169         old_vtep_ip = zif->l2info.vxl.vtep_ip;
 170         if (IPV4_ADDR_SAME(&old_vtep_ip, &vxlan_info->vtep_ip))
 171                 return;
 172
 173         zif->l2info.vxl.vtep_ip = vxlan_info->vtep_ip;
 174         zebra_vxlan_if_update(ifp, ZEBRA_VXLIF_LOCAL_IP_CHANGE);
 175 }
 176
 177 /*
 178  * Handle change to VLAN to VNI mapping.
 179  */
 180 void zebra_l2_vxlanif_update_access_vlan(struct interface *ifp,
 181                                          vlanid_t access_vlan)
 182 {
 183         struct zebra_if *zif;
 184         vlanid_t old_access_vlan;
 185
 186         zif = ifp->info;
 187         assert(zif);
 188
 189         old_access_vlan = zif->l2info.vxl.access_vlan;
 190         if (old_access_vlan == access_vlan)
 191                 return;
 192
 193         zif->l2info.vxl.access_vlan = access_vlan;
 194         zebra_vxlan_if_update(ifp, ZEBRA_VXLIF_VLAN_CHANGE);
 195 }
 196
 197 /*
 198  * Handle VxLAN interface delete.
 199  */
 200 void zebra_l2_vxlanif_del(struct interface *ifp)
 201 {
 202         zebra_vxlan_if_del(ifp);
 203 }
 204
 205 /*
 206  * Map or unmap interface from bridge.
 207  * NOTE: It is currently assumped that an interface has to be unmapped
 208  * from a bridge before it can be mapped to another bridge.
 209  */
 210 void zebra_l2if_update_bridge_slave(struct interface *ifp,
 211                                     ifindex_t bridge_ifindex)
 212 {
 213         struct zebra_if *zif;
 214         ifindex_t old_bridge_ifindex;
 215
 216         zif = ifp->info;
 217         assert(zif);
 218
 219         old_bridge_ifindex = zif->brslave_info.bridge_ifindex;
 220         if (old_bridge_ifindex == bridge_ifindex)
 221                 return;
 222
 223         zif->brslave_info.bridge_ifindex = bridge_ifindex;
 224
 225         /* Set up or remove link with master */
 226         if (bridge_ifindex != IFINDEX_INTERNAL) {
 227                 zebra_l2_map_slave_to_bridge(&zif->brslave_info);
 228                 /* In the case of VxLAN, invoke the handler for EVPN. */
 229                 if (zif->zif_type == ZEBRA_IF_VXLAN)
 230                         zebra_vxlan_if_update(ifp, ZEBRA_VXLIF_MASTER_CHANGE);
 231         } else if (old_bridge_ifindex != IFINDEX_INTERNAL) {
 232                 /*
 233                  * In the case of VxLAN, invoke the handler for EVPN.
 234                  * Note that this should be done *prior*
 235                  * to unmapping the interface from the bridge.
 236                  */
 237                 if (zif->zif_type == ZEBRA_IF_VXLAN)
 238                         zebra_vxlan_if_update(ifp, ZEBRA_VXLIF_MASTER_CHANGE);
 239                 zebra_l2_unmap_slave_from_bridge(&zif->brslave_info);
 240         }
 241 }