bgpd/bgp_mplsvpn.h

   1 /* MPLS-VPN
   2  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
   3  *
   4  * This file is part of GxNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef _QUAGGA_BGP_MPLSVPN_H
  22 #define _QUAGGA_BGP_MPLSVPN_H
  23
  24 #include "bgpd/bgp_attr.h"
  25 #include "bgpd/bgp_route.h"
  26 #include "bgpd/bgp_rd.h"
  27 #include "bgpd/bgp_zebra.h"
  28
  29 #define MPLS_LABEL_IS_SPECIAL(label) ((label) <= MPLS_LABEL_EXTENSION)
  30 #define MPLS_LABEL_IS_NULL(label)                                              \
  31         ((label) == MPLS_LABEL_IPV4_EXPLICIT_NULL                              \
  32          || (label) == MPLS_LABEL_IPV6_EXPLICIT_NULL                           \
  33          || (label) == MPLS_LABEL_IMPLICIT_NULL)
  34
  35 #define BGP_VPNVX_HELP_STR BGP_AF_STR BGP_AF_STR
  36
  37 #define V4_HEADER                                                              \
  38         "   Network          Next Hop            Metric LocPrf Weight Path\n"
  39 #define V4_HEADER_TAG "   Network          Next Hop      In tag/Out tag\n"
  40 #define V4_HEADER_OVERLAY                                                      \
  41         "   Network          Next Hop      EthTag    Overlay Index   RouterMac\n"
  42
  43 extern void bgp_mplsvpn_init(void);
  44 extern int bgp_nlri_parse_vpn(struct peer *, struct attr *, struct bgp_nlri *);
  45 extern uint32_t decode_label(mpls_label_t *);
  46 extern void encode_label(mpls_label_t, mpls_label_t *);
  47
  48 extern int argv_find_and_parse_vpnvx(struct cmd_token **argv, int argc,
  49                                      int *index, afi_t *afi);
  50 extern int bgp_show_mpls_vpn(struct vty *vty, afi_t afi, struct prefix_rd *prd,
  51                              enum bgp_show_type type, void *output_arg,
  52                              int tags, bool use_json);
  53
  54 extern void vpn_leak_from_vrf_update(struct bgp *to_bgp, struct bgp *from_bgp,
  55                                      struct bgp_path_info *path_vrf);
  56
  57 extern void vpn_leak_from_vrf_withdraw(struct bgp *to_bgp, struct bgp *from_bgp,
  58                                        struct bgp_path_info *path_vrf);
  59
  60 extern void vpn_leak_from_vrf_withdraw_all(struct bgp *to_bgp,
  61                                            struct bgp *from_bgp, afi_t afi);
  62
  63 extern void vpn_leak_from_vrf_update_all(struct bgp *to_bgp,
  64                                          struct bgp *from_bgp, afi_t afi);
  65
  66 extern void vpn_leak_to_vrf_withdraw_all(struct bgp *to_bgp, afi_t afi);
  67
  68 extern void vpn_leak_to_vrf_update_all(struct bgp *to_bgp, struct bgp *from_bgp,
  69                                        afi_t afi);
  70
  71 extern void vpn_leak_to_vrf_update(struct bgp *from_bgp,
  72                                    struct bgp_path_info *path_vpn);
  73
  74 extern void vpn_leak_to_vrf_withdraw(struct bgp *from_bgp,
  75                                      struct bgp_path_info *path_vpn);
  76
  77 extern void vpn_leak_zebra_vrf_label_update(struct bgp *bgp, afi_t afi);
  78 extern void vpn_leak_zebra_vrf_label_withdraw(struct bgp *bgp, afi_t afi);
  79 extern void vpn_leak_zebra_vrf_sid_update(struct bgp *bgp, afi_t afi);
  80 extern void vpn_leak_zebra_vrf_sid_withdraw(struct bgp *bgp, afi_t afi);
  81 extern int vpn_leak_label_callback(mpls_label_t label, void *lblid, bool alloc);
  82 extern void ensure_vrf_tovpn_sid(struct bgp *vpn, struct bgp *vrf, afi_t afi);
  83 extern void transpose_sid(struct in6_addr *sid, uint32_t label, uint8_t offset,
  84                           uint8_t size);
  85 extern void vrf_import_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  86                                 afi_t afi, safi_t safi);
  87 void vrf_unimport_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  88                            afi_t afi, safi_t safi);
  89
  90 static inline bool is_bgp_vrf_mplsvpn(struct bgp *bgp)
  91 {
  92         afi_t afi;
  93
  94         if (bgp->inst_type == BGP_INSTANCE_TYPE_VRF)
  95                 for (afi = 0; afi < AFI_MAX; ++afi) {
  96                         if (CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
  97                                        BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
  98                             || CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
  99                                           BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT))
 100                                 return true;
 101                 }
 102         return false;
 103 }
 104
 105 static inline int vpn_leak_to_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 106                                          const char **pmsg)
 107 {
 108         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 109                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 110
 111                 if (pmsg)
 112                         *pmsg = "source bgp instance neither vrf nor default";
 113                 return 0;
 114         }
 115
 116         /* Is vrf configured to export to vpn? */
 117         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 118                         BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
 119             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 120                            BGP_CONFIG_VRF_TO_VRF_EXPORT)) {
 121                 if (pmsg)
 122                         *pmsg = "export not set";
 123                 return 0;
 124         }
 125
 126         /* Is there an RT list set? */
 127         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_TOVPN]) {
 128                 if (pmsg)
 129                         *pmsg = "rtlist tovpn not defined";
 130                 return 0;
 131         }
 132
 133         /* Is there an RD set? */
 134         if (!CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 135                         BGP_VPN_POLICY_TOVPN_RD_SET)) {
 136                 if (pmsg)
 137                         *pmsg = "rd not defined";
 138                 return 0;
 139         }
 140
 141         /* Is a route-map specified, but not defined? */
 142         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_TOVPN] &&
 143                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_TOVPN]) {
 144                 if (pmsg)
 145                         *pmsg = "route-map tovpn named but not defined";
 146                 return 0;
 147         }
 148
 149         /* Is there an "auto" export label that isn't allocated yet? */
 150         if (CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 151                 BGP_VPN_POLICY_TOVPN_LABEL_AUTO) &&
 152                 (bgp_vrf->vpn_policy[afi].tovpn_label == MPLS_LABEL_NONE)) {
 153
 154                 if (pmsg)
 155                         *pmsg = "auto label not allocated";
 156                 return 0;
 157         }
 158
 159         return 1;
 160 }
 161
 162 static inline int vpn_leak_from_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 163                                            const char **pmsg)
 164 {
 165         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 166                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 167
 168                 if (pmsg)
 169                         *pmsg = "destination bgp instance neither vrf nor default";
 170                 return 0;
 171         }
 172
 173         if (bgp_vrf->vrf_id == VRF_UNKNOWN) {
 174                 if (pmsg)
 175                         *pmsg = "destination bgp instance vrf is VRF_UNKNOWN";
 176                 return 0;
 177         }
 178
 179         /* Is vrf configured to import from vpn? */
 180         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 181                         BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT)
 182             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 183                            BGP_CONFIG_VRF_TO_VRF_IMPORT)) {
 184                 if (pmsg)
 185                         *pmsg = "import not set";
 186                 return 0;
 187         }
 188
 189         /* Is there an RT list set? */
 190         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_FROMVPN]) {
 191                 if (pmsg)
 192                         *pmsg = "rtlist fromvpn not defined";
 193                 return 0;
 194         }
 195
 196         /* Is a route-map specified, but not defined? */
 197         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_FROMVPN] &&
 198                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_FROMVPN]) {
 199                 if (pmsg)
 200                         *pmsg = "route-map fromvpn named but not defined";
 201                 return 0;
 202         }
 203         return 1;
 204 }
 205
 206 static inline void vpn_leak_prechange(enum vpn_policy_direction direction,
 207                                       afi_t afi, struct bgp *bgp_vpn,
 208                                       struct bgp *bgp_vrf)
 209 {
 210         /* Detect when default bgp instance is not (yet) defined by config */
 211         if (!bgp_vpn)
 212                 return;
 213
 214         if ((direction == BGP_VPN_POLICY_DIR_FROMVPN) &&
 215                 vpn_leak_from_vpn_active(bgp_vrf, afi, NULL)) {
 216
 217                 vpn_leak_to_vrf_withdraw_all(bgp_vrf, afi);
 218         }
 219         if ((direction == BGP_VPN_POLICY_DIR_TOVPN) &&
 220                 vpn_leak_to_vpn_active(bgp_vrf, afi, NULL)) {
 221
 222                 vpn_leak_from_vrf_withdraw_all(bgp_vpn, bgp_vrf, afi);
 223         }
 224 }
 225
 226 static inline void vpn_leak_postchange(enum vpn_policy_direction direction,
 227                                        afi_t afi, struct bgp *bgp_vpn,
 228                                        struct bgp *bgp_vrf)
 229 {
 230         /* Detect when default bgp instance is not (yet) defined by config */
 231         if (!bgp_vpn)
 232                 return;
 233
 234         if (direction == BGP_VPN_POLICY_DIR_FROMVPN)
 235                 vpn_leak_to_vrf_update_all(bgp_vrf, bgp_vpn, afi);
 236         if (direction == BGP_VPN_POLICY_DIR_TOVPN) {
 237
 238                 if (bgp_vrf->vpn_policy[afi].tovpn_label !=
 239                         bgp_vrf->vpn_policy[afi]
 240                                .tovpn_zebra_vrf_label_last_sent) {
 241                         vpn_leak_zebra_vrf_label_update(bgp_vrf, afi);
 242                 }
 243
 244                 if (!bgp_vrf->vpn_policy[afi].tovpn_sid)
 245                         ensure_vrf_tovpn_sid(bgp_vpn, bgp_vrf, afi);
 246
 247                 if (!bgp_vrf->vpn_policy[afi].tovpn_sid
 248                     && bgp_vrf->vpn_policy[afi].tovpn_zebra_vrf_sid_last_sent)
 249                         vpn_leak_zebra_vrf_sid_withdraw(bgp_vrf, afi);
 250
 251                 if (sid_diff(bgp_vrf->vpn_policy[afi].tovpn_sid,
 252                              bgp_vrf->vpn_policy[afi]
 253                                      .tovpn_zebra_vrf_sid_last_sent)) {
 254                         vpn_leak_zebra_vrf_sid_update(bgp_vrf, afi);
 255                 }
 256
 257                 vpn_leak_from_vrf_update_all(bgp_vpn, bgp_vrf, afi);
 258         }
 259 }
 260
 261 /* Flag if the route is injectable into VPN. This would be either a
 262  * non-imported route or a non-VPN imported route.
 263  */
 264 static inline bool is_route_injectable_into_vpn(struct bgp_path_info *pi)
 265 {
 266         struct bgp_path_info *parent_pi;
 267         struct bgp_table *table;
 268         struct bgp_dest *dest;
 269
 270         if (pi->sub_type != BGP_ROUTE_IMPORTED ||
 271             !pi->extra ||
 272             !pi->extra->parent)
 273                 return true;
 274
 275         parent_pi = (struct bgp_path_info *)pi->extra->parent;
 276         dest = parent_pi->net;
 277         if (!dest)
 278                 return true;
 279         table = bgp_dest_table(dest);
 280         if (table &&
 281             (table->afi == AFI_IP || table->afi == AFI_IP6) &&
 282             table->safi == SAFI_MPLS_VPN)
 283                 return false;
 284         return true;
 285 }
 286
 287 /* Flag if the route path's family is VPN. */
 288 static inline bool is_pi_family_vpn(struct bgp_path_info *pi)
 289 {
 290         return (is_pi_family_matching(pi, AFI_IP, SAFI_MPLS_VPN) ||
 291                 is_pi_family_matching(pi, AFI_IP6, SAFI_MPLS_VPN));
 292 }
 293
 294 extern void vpn_policy_routemap_event(const char *rmap_name);
 295
 296 extern vrf_id_t get_first_vrf_for_redirect_with_rt(struct ecommunity *eckey);
 297
 298 extern void vpn_leak_postchange_all(void);
 299 extern void vpn_handle_router_id_update(struct bgp *bgp, bool withdraw,
 300                                         bool is_config);
 301 extern void bgp_vpn_leak_unimport(struct bgp *from_bgp);
 302 extern void bgp_vpn_leak_export(struct bgp *from_bgp);
 303
 304 #endif /* _QUAGGA_BGP_MPLSVPN_H */