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