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 interface *ifp;
  56
  57         RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
  58                 FOR_ALL_INTERFACES (vrf, ifp) {
  59                         struct zebra_if *zif;
  60                         struct zebra_l2info_brslave *br_slave;
  61
  62                         if (ifp->ifindex == IFINDEX_INTERNAL || !ifp->info)
  63                                 continue;
  64                         if (!IS_ZEBRA_IF_BRIDGE_SLAVE(ifp))
  65                                 continue;
  66
  67                         /* NOTE: This assumes 'zebra_l2info_brslave' is the
  68                          * first field
  69                          * for any L2 interface.
  70                          */
  71                         zif = (struct zebra_if *)ifp->info;
  72                         br_slave = &zif->brslave_info;
  73
  74                         if (link) {
  75                                 if (br_slave->bridge_ifindex == br_if->ifindex)
  76                                         br_slave->br_if = br_if;
  77                         } else {
  78                                 if (br_slave->br_if == br_if)
  79                                         br_slave->br_if = NULL;
  80                         }
  81                 }
  82         }
  83 }
  84
  85 /* Public functions */
  86 void zebra_l2_map_slave_to_bridge(struct zebra_l2info_brslave *br_slave)
  87 {
  88         struct interface *br_if;
  89
  90         /* TODO: Handle change of master */
  91         br_if = if_lookup_by_index_per_ns(zebra_ns_lookup(NS_DEFAULT),
  92                                           br_slave->bridge_ifindex);
  93         if (br_if)
  94                 br_slave->br_if = br_if;
  95 }
  96
  97 void zebra_l2_unmap_slave_from_bridge(struct zebra_l2info_brslave *br_slave)
  98 {
  99         br_slave->br_if = NULL;
 100 }
 101
 102 void zebra_l2_map_slave_to_bond(struct zebra_l2info_bondslave *bond_slave,
 103                                 vrf_id_t vrf_id)
 104 {
 105         struct interface *bond_if;
 106
 107         /* TODO: Handle change of master */
 108         bond_if = if_lookup_by_index_all_vrf(bond_slave->bond_ifindex);
 109         if (bond_if)
 110                 bond_slave->bond_if = bond_if;
 111         else
 112                 bond_slave->bond_if = if_create_ifindex(bond_slave->bond_ifindex,
 113                                                         vrf_id);
 114 }
 115
 116 void zebra_l2_unmap_slave_from_bond(struct zebra_l2info_bondslave *bond_slave)
 117 {
 118         if (bond_slave != NULL)
 119                 bond_slave->bond_if = NULL;
 120 }
 121
 122 /*
 123  * Handle Bridge interface add or update. Update relevant info,
 124  * map slaves (if any) to the bridge.
 125  */
 126 void zebra_l2_bridge_add_update(struct interface *ifp,
 127                                 struct zebra_l2info_bridge *bridge_info,
 128                                 int add)
 129 {
 130         struct zebra_if *zif;
 131
 132         zif = ifp->info;
 133         assert(zif);
 134
 135         /* Copy over the L2 information. */
 136         memcpy(&zif->l2info.br, bridge_info, sizeof(*bridge_info));
 137
 138         /* Link all slaves to this bridge */
 139         map_slaves_to_bridge(ifp, 1);
 140 }
 141
 142 /*
 143  * Handle Bridge interface delete.
 144  */
 145 void zebra_l2_bridge_del(struct interface *ifp)
 146 {
 147         /* Unlink all slaves to this bridge */
 148         map_slaves_to_bridge(ifp, 0);
 149 }
 150
 151 /*
 152  * Update L2 info for a VLAN interface. Only relevant parameter is the
 153  * VLAN Id and this cannot change.
 154  */
 155 void zebra_l2_vlanif_update(struct interface *ifp,
 156                             struct zebra_l2info_vlan *vlan_info)
 157 {
 158         struct zebra_if *zif;
 159
 160         zif = ifp->info;
 161         assert(zif);
 162
 163         /* Copy over the L2 information. */
 164         memcpy(&zif->l2info.vl, vlan_info, sizeof(*vlan_info));
 165 }
 166
 167 /*
 168  * Update L2 info for a VxLAN interface. This is called upon interface
 169  * addition as well as update. Upon add, need to invoke the VNI create
 170  * function. Upon update, the params of interest are the local tunnel
 171  * IP and VLAN mapping, but the latter is handled separately.
 172  */
 173 void zebra_l2_vxlanif_add_update(struct interface *ifp,
 174                                  struct zebra_l2info_vxlan *vxlan_info, int add)
 175 {
 176         struct zebra_if *zif;
 177         struct in_addr old_vtep_ip;
 178         uint16_t chgflags = 0;
 179
 180         zif = ifp->info;
 181         assert(zif);
 182
 183         if (add) {
 184                 memcpy(&zif->l2info.vxl, vxlan_info, sizeof(*vxlan_info));
 185                 zebra_vxlan_if_add(ifp);
 186                 return;
 187         }
 188
 189         old_vtep_ip = zif->l2info.vxl.vtep_ip;
 190
 191         if (!IPV4_ADDR_SAME(&old_vtep_ip, &vxlan_info->vtep_ip)) {
 192                 chgflags |= ZEBRA_VXLIF_LOCAL_IP_CHANGE;
 193                 zif->l2info.vxl.vtep_ip = vxlan_info->vtep_ip;
 194         }
 195
 196         if (!IPV4_ADDR_SAME(&zif->l2info.vxl.mcast_grp,
 197                                 &vxlan_info->mcast_grp)) {
 198                 chgflags |= ZEBRA_VXLIF_MCAST_GRP_CHANGE;
 199                 zif->l2info.vxl.mcast_grp = vxlan_info->mcast_grp;
 200         }
 201
 202         if (chgflags)
 203                 zebra_vxlan_if_update(ifp, chgflags);
 204 }
 205
 206 /*
 207  * Handle change to VLAN to VNI mapping.
 208  */
 209 void zebra_l2_vxlanif_update_access_vlan(struct interface *ifp,
 210                                          vlanid_t access_vlan)
 211 {
 212         struct zebra_if *zif;
 213         vlanid_t old_access_vlan;
 214
 215         zif = ifp->info;
 216         assert(zif);
 217
 218         old_access_vlan = zif->l2info.vxl.access_vlan;
 219         if (old_access_vlan == access_vlan)
 220                 return;
 221
 222         zif->l2info.vxl.access_vlan = access_vlan;
 223         zebra_vxlan_if_update(ifp, ZEBRA_VXLIF_VLAN_CHANGE);
 224 }
 225
 226 /*
 227  * Handle VxLAN interface delete.
 228  */
 229 void zebra_l2_vxlanif_del(struct interface *ifp)
 230 {
 231         zebra_vxlan_if_del(ifp);
 232 }
 233
 234 /*
 235  * Map or unmap interface from bridge.
 236  * NOTE: It is currently assumped that an interface has to be unmapped
 237  * from a bridge before it can be mapped to another bridge.
 238  */
 239 void zebra_l2if_update_bridge_slave(struct interface *ifp,
 240                                     ifindex_t bridge_ifindex)
 241 {
 242         struct zebra_if *zif;
 243         ifindex_t old_bridge_ifindex;
 244
 245         zif = ifp->info;
 246         assert(zif);
 247
 248         old_bridge_ifindex = zif->brslave_info.bridge_ifindex;
 249         if (old_bridge_ifindex == bridge_ifindex)
 250                 return;
 251
 252         zif->brslave_info.bridge_ifindex = bridge_ifindex;
 253
 254         /* Set up or remove link with master */
 255         if (bridge_ifindex != IFINDEX_INTERNAL) {
 256                 zebra_l2_map_slave_to_bridge(&zif->brslave_info);
 257                 /* In the case of VxLAN, invoke the handler for EVPN. */
 258                 if (zif->zif_type == ZEBRA_IF_VXLAN)
 259                         zebra_vxlan_if_update(ifp, ZEBRA_VXLIF_MASTER_CHANGE);
 260         } else if (old_bridge_ifindex != IFINDEX_INTERNAL) {
 261                 /*
 262                  * In the case of VxLAN, invoke the handler for EVPN.
 263                  * Note that this should be done *prior*
 264                  * to unmapping the interface from the bridge.
 265                  */
 266                 if (zif->zif_type == ZEBRA_IF_VXLAN)
 267                         zebra_vxlan_if_update(ifp, ZEBRA_VXLIF_MASTER_CHANGE);
 268                 zebra_l2_unmap_slave_from_bridge(&zif->brslave_info);
 269         }
 270 }
 271
 272 void zebra_l2if_update_bond_slave(struct interface *ifp, ifindex_t bond_ifindex)
 273 {
 274         struct zebra_if *zif;
 275         ifindex_t old_bond_ifindex;
 276
 277         zif = ifp->info;
 278         assert(zif);
 279
 280         old_bond_ifindex = zif->bondslave_info.bond_ifindex;
 281         if (old_bond_ifindex == bond_ifindex)
 282                 return;
 283
 284         zif->bondslave_info.bond_ifindex = bond_ifindex;
 285
 286         /* Set up or remove link with master */
 287         if (bond_ifindex != IFINDEX_INTERNAL)
 288                 zebra_l2_map_slave_to_bond(&zif->bondslave_info, ifp->vrf_id);
 289         else if (old_bond_ifindex != IFINDEX_INTERNAL)
 290                 zebra_l2_unmap_slave_from_bond(&zif->bondslave_info);
 291 }