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