zebra/zebra_mpls.h

   1 /*
   2  * Zebra MPLS Data structures and definitions
   3  * Copyright (C) 2015 Cumulus Networks, Inc.
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra 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  * GNU Zebra 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 along
  18  * with this program; see the file COPYING; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef _ZEBRA_MPLS_H
  23 #define _ZEBRA_MPLS_H
  24
  25 #include "prefix.h"
  26 #include "table.h"
  27 #include "queue.h"
  28 #include "hash.h"
  29 #include "jhash.h"
  30 #include "nexthop.h"
  31 #include "vty.h"
  32 #include "memory.h"
  33 #include "mpls.h"
  34 #include "zebra/zserv.h"
  35 #include "zebra/zebra_vrf.h"
  36
  37
  38 /* Definitions and macros. */
  39
  40 #define NHLFE_FAMILY(nhlfe)                                                    \
  41         (((nhlfe)->nexthop->type == NEXTHOP_TYPE_IPV6                          \
  42           || (nhlfe)->nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)              \
  43                  ? AF_INET6                                                    \
  44                  : AF_INET)
  45
  46 /* Typedefs */
  47
  48 typedef struct zebra_ile_t_ zebra_ile_t;
  49 typedef struct zebra_snhlfe_t_ zebra_snhlfe_t;
  50 typedef struct zebra_slsp_t_ zebra_slsp_t;
  51 typedef struct zebra_nhlfe_t_ zebra_nhlfe_t;
  52 typedef struct zebra_lsp_t_ zebra_lsp_t;
  53 typedef struct zebra_fec_t_ zebra_fec_t;
  54
  55 /*
  56  * (Outgoing) nexthop label forwarding entry configuration
  57  */
  58 struct zebra_snhlfe_t_ {
  59         /* Nexthop information */
  60         enum nexthop_types_t gtype;
  61         union g_addr gate;
  62         char *ifname;
  63         ifindex_t ifindex;
  64
  65         /* Out label. */
  66         mpls_label_t out_label;
  67
  68         /* Backpointer to base entry. */
  69         zebra_slsp_t *slsp;
  70
  71         /* Pointers to more outgoing information for same in-label */
  72         zebra_snhlfe_t *next;
  73         zebra_snhlfe_t *prev;
  74 };
  75
  76 /*
  77  * (Outgoing) nexthop label forwarding entry
  78  */
  79 struct zebra_nhlfe_t_ {
  80         /* Type of entry - static etc. */
  81         enum lsp_types_t type;
  82
  83         /* Nexthop information (with outgoing label) */
  84         struct nexthop *nexthop;
  85
  86         /* Backpointer to base entry. */
  87         zebra_lsp_t *lsp;
  88
  89         /* Runtime info - flags, pointers etc. */
  90         uint32_t flags;
  91 #define NHLFE_FLAG_CHANGED     (1 << 0)
  92 #define NHLFE_FLAG_SELECTED    (1 << 1)
  93 #define NHLFE_FLAG_MULTIPATH   (1 << 2)
  94 #define NHLFE_FLAG_DELETED     (1 << 3)
  95 #define NHLFE_FLAG_INSTALLED   (1 << 4)
  96
  97         zebra_nhlfe_t *next;
  98         zebra_nhlfe_t *prev;
  99         uint8_t distance;
 100 };
 101
 102 /*
 103  * Incoming label entry
 104  */
 105 struct zebra_ile_t_ {
 106         mpls_label_t in_label;
 107 };
 108
 109 /*
 110  * Label swap entry static configuration.
 111  */
 112 struct zebra_slsp_t_ {
 113         /* Incoming label */
 114         zebra_ile_t ile;
 115
 116         /* List of outgoing nexthop static configuration */
 117         zebra_snhlfe_t *snhlfe_list;
 118 };
 119
 120 /*
 121  * Label swap entry (ile -> list of nhlfes)
 122  */
 123 struct zebra_lsp_t_ {
 124         /* Incoming label */
 125         zebra_ile_t ile;
 126
 127         /* List of NHLFE, pointer to best and num equal-cost. */
 128         zebra_nhlfe_t *nhlfe_list;
 129         zebra_nhlfe_t *best_nhlfe;
 130         uint32_t num_ecmp;
 131
 132         /* Flags */
 133         uint32_t flags;
 134 #define LSP_FLAG_SCHEDULED        (1 << 0)
 135 #define LSP_FLAG_INSTALLED        (1 << 1)
 136 #define LSP_FLAG_CHANGED          (1 << 2)
 137
 138         /* Address-family of NHLFE - saved here for delete. All NHLFEs */
 139         /* have to be of the same AF */
 140         uint8_t addr_family;
 141 };
 142
 143 /*
 144  * FEC to label binding.
 145  */
 146 struct zebra_fec_t_ {
 147         /* FEC (prefix) */
 148         struct route_node *rn;
 149
 150         /* In-label - either statically bound or derived from label block. */
 151         mpls_label_t label;
 152
 153         /* Label index (into global label block), if valid */
 154         uint32_t label_index;
 155
 156         /* Flags. */
 157         uint32_t flags;
 158 #define FEC_FLAG_CONFIGURED       (1 << 0)
 159
 160         /* Clients interested in this FEC. */
 161         struct list *client_list;
 162 };
 163
 164 /* Function declarations. */
 165
 166 /*
 167  * Add/update global label block.
 168  */
 169 int zebra_mpls_label_block_add(struct zebra_vrf *zvrf, uint32_t start_label,
 170                                uint32_t end_label);
 171
 172 /*
 173  * Delete global label block.
 174  */
 175 int zebra_mpls_label_block_del(struct zebra_vrf *vrf);
 176
 177 /*
 178  * Display MPLS global label block configuration (VTY command handler).
 179  */
 180 int zebra_mpls_write_label_block_config(struct vty *vty, struct zebra_vrf *vrf);
 181
 182 /*
 183  * Install dynamic LSP entry.
 184  */
 185 int zebra_mpls_lsp_install(struct zebra_vrf *zvrf, struct route_node *rn,
 186                            struct route_entry *re);
 187
 188 /*
 189  * Uninstall dynamic LSP entry, if any.
 190  */
 191 int zebra_mpls_lsp_uninstall(struct zebra_vrf *zvrf, struct route_node *rn,
 192                              struct route_entry *re);
 193
 194 /*
 195  * Registration from a client for the label binding for a FEC. If a binding
 196  * already exists, it is informed to the client.
 197  * NOTE: If there is a manually configured label binding, that is used.
 198  * Otherwise, if aa label index is specified, it means we have to allocate the
 199  * label from a locally configured label block (SRGB), if one exists and index
 200  * is acceptable.
 201  */
 202 int zebra_mpls_fec_register(struct zebra_vrf *zvrf, struct prefix *p,
 203                             uint32_t label_index, struct zserv *client);
 204
 205 /*
 206  * Deregistration from a client for the label binding for a FEC. The FEC
 207  * itself is deleted if no other registered clients exist and there is no
 208  * label bound to the FEC.
 209  */
 210 int zebra_mpls_fec_unregister(struct zebra_vrf *zvrf, struct prefix *p,
 211                               struct zserv *client);
 212
 213 /*
 214  * Return FEC (if any) to which this label is bound.
 215  * Note: Only works for per-prefix binding and when the label is not
 216  * implicit-null.
 217  * TODO: Currently walks entire table, can optimize later with another
 218  * hash..
 219  */
 220 zebra_fec_t *zebra_mpls_fec_for_label(struct zebra_vrf *zvrf,
 221                                       mpls_label_t label);
 222
 223 /*
 224  * Inform if specified label is currently bound to a FEC or not.
 225  */
 226 int zebra_mpls_label_already_bound(struct zebra_vrf *zvrf, mpls_label_t label);
 227
 228 /*
 229  * Add static FEC to label binding. If there are clients registered for this
 230  * FEC, notify them. If there are labeled routes for this FEC, install the
 231  * label forwarding entry.
 232  */
 233 int zebra_mpls_static_fec_add(struct zebra_vrf *zvrf, struct prefix *p,
 234                               mpls_label_t in_label);
 235
 236 /*
 237  * Remove static FEC to label binding. If there are no clients registered
 238  * for this FEC, delete the FEC; else notify clients.
 239  * Note: Upon delete of static binding, if label index exists for this FEC,
 240  * client may need to be updated with derived label.
 241  */
 242 int zebra_mpls_static_fec_del(struct zebra_vrf *zvrf, struct prefix *p);
 243
 244 /*
 245  * Display MPLS FEC to label binding configuration (VTY command handler).
 246  */
 247 int zebra_mpls_write_fec_config(struct vty *vty, struct zebra_vrf *zvrf);
 248
 249 /*
 250  * Display MPLS FEC to label binding (VTY command handler).
 251  */
 252 void zebra_mpls_print_fec_table(struct vty *vty, struct zebra_vrf *zvrf);
 253
 254 /*
 255  * Display MPLS FEC to label binding for a specific FEC (VTY command handler).
 256  */
 257 void zebra_mpls_print_fec(struct vty *vty, struct zebra_vrf *zvrf,
 258                           struct prefix *p);
 259
 260 /*
 261  * Install/uninstall a FEC-To-NHLFE (FTN) binding.
 262  */
 263 int mpls_ftn_update(int add, struct zebra_vrf *zvrf, enum lsp_types_t type,
 264                     struct prefix *prefix, enum nexthop_types_t gtype,
 265                     union g_addr *gate, ifindex_t ifindex, uint8_t distance,
 266                     mpls_label_t out_label);
 267
 268 /*
 269  * Install/update a NHLFE for an LSP in the forwarding table. This may be
 270  * a new LSP entry or a new NHLFE for an existing in-label or an update of
 271  * the out-label for an existing NHLFE (update case).
 272  */
 273 int mpls_lsp_install(struct zebra_vrf *zvrf, enum lsp_types_t type,
 274                      mpls_label_t in_label, mpls_label_t out_label,
 275                      enum nexthop_types_t gtype, union g_addr *gate,
 276                      ifindex_t ifindex);
 277
 278 /*
 279  * Uninstall a particular NHLFE in the forwarding table. If this is
 280  * the only NHLFE, the entire LSP forwarding entry has to be deleted.
 281  */
 282 int mpls_lsp_uninstall(struct zebra_vrf *zvrf, enum lsp_types_t type,
 283                        mpls_label_t in_label, enum nexthop_types_t gtype,
 284                        union g_addr *gate, ifindex_t ifindex);
 285
 286 /*
 287  * Uninstall all LDP NHLFEs for a particular LSP forwarding entry.
 288  * If no other NHLFEs exist, the entry would be deleted.
 289  */
 290 void mpls_ldp_lsp_uninstall_all(struct hash_backet *backet, void *ctxt);
 291
 292 /*
 293  * Uninstall all LDP FEC-To-NHLFE (FTN) bindings of the given address-family.
 294  */
 295 void mpls_ldp_ftn_uninstall_all(struct zebra_vrf *zvrf, int afi);
 296
 297 /*
 298  * Uninstall all Segment Routing NHLFEs for a particular LSP forwarding entry.
 299  * If no other NHLFEs exist, the entry would be deleted.
 300  */
 301 void mpls_sr_lsp_uninstall_all(struct hash_backet *backet, void *ctxt);
 302
 303 #if defined(HAVE_CUMULUS)
 304 /*
 305  * Check that the label values used in LSP creation are consistent. The
 306  * main criteria is that if there is ECMP, the label operation must still
 307  * be consistent - i.e., all paths either do a swap or do PHP. This is due
 308  * to current HW restrictions.
 309  */
 310 int zebra_mpls_lsp_label_consistent(struct zebra_vrf *zvrf,
 311                                     mpls_label_t in_label,
 312                                     mpls_label_t out_label,
 313                                     enum nexthop_types_t gtype,
 314                                     union g_addr *gate, ifindex_t ifindex);
 315 #endif /* HAVE_CUMULUS */
 316
 317 /*
 318  * Add static LSP entry. This may be the first entry for this incoming label
 319  * or an additional nexthop; an existing entry may also have outgoing label
 320  * changed.
 321  * Note: The label operation (swap or PHP) is common for the LSP entry (all
 322  * NHLFEs).
 323  */
 324 int zebra_mpls_static_lsp_add(struct zebra_vrf *zvrf, mpls_label_t in_label,
 325                               mpls_label_t out_label,
 326                               enum nexthop_types_t gtype, union g_addr *gate,
 327                               ifindex_t ifindex);
 328
 329 /*
 330  * Delete static LSP entry. This may be the delete of one particular
 331  * NHLFE for this incoming label or the delete of the entire entry (i.e.,
 332  * all NHLFEs).
 333  * NOTE: Delete of the only NHLFE will also end up deleting the entire
 334  * LSP configuration.
 335  */
 336 int zebra_mpls_static_lsp_del(struct zebra_vrf *zvrf, mpls_label_t in_label,
 337                               enum nexthop_types_t gtype, union g_addr *gate,
 338                               ifindex_t ifindex);
 339
 340 /*
 341  * Schedule all MPLS label forwarding entries for processing.
 342  * Called upon changes that may affect one or more of them such as
 343  * interface or nexthop state changes.
 344  */
 345 void zebra_mpls_lsp_schedule(struct zebra_vrf *zvrf);
 346
 347 /*
 348  * Display MPLS label forwarding table for a specific LSP
 349  * (VTY command handler).
 350  */
 351 void zebra_mpls_print_lsp(struct vty *vty, struct zebra_vrf *zvrf,
 352                           mpls_label_t label, bool use_json);
 353
 354 /*
 355  * Display MPLS label forwarding table (VTY command handler).
 356  */
 357 void zebra_mpls_print_lsp_table(struct vty *vty, struct zebra_vrf *zvrf,
 358                                 bool use_json);
 359
 360 /*
 361  * Display MPLS LSP configuration of all static LSPs (VTY command handler).
 362  */
 363 int zebra_mpls_write_lsp_config(struct vty *vty, struct zebra_vrf *zvrf);
 364
 365 /*
 366  * Called when VRF becomes inactive, cleans up information but keeps
 367  * the table itself.
 368  * NOTE: Currently supported only for default VRF.
 369  */
 370 void zebra_mpls_cleanup_tables(struct zebra_vrf *zvrf);
 371
 372 /*
 373  * Called upon process exiting, need to delete LSP forwarding
 374  * entries from the kernel.
 375  * NOTE: Currently supported only for default VRF.
 376  */
 377 void zebra_mpls_close_tables(struct zebra_vrf *zvrf);
 378
 379 /*
 380  * Allocate MPLS tables for this VRF.
 381  * NOTE: Currently supported only for default VRF.
 382  */
 383 void zebra_mpls_init_tables(struct zebra_vrf *zvrf);
 384
 385 /*
 386  * Global MPLS initialization.
 387  */
 388 void zebra_mpls_init(void);
 389
 390 /*
 391  * MPLS VTY.
 392  */
 393 void zebra_mpls_vty_init(void);
 394
 395 /* Inline functions. */
 396
 397 /*
 398  * Distance (priority) definition for LSP NHLFE.
 399  */
 400 static inline uint8_t lsp_distance(enum lsp_types_t type)
 401 {
 402         switch (type) {
 403         case ZEBRA_LSP_STATIC:
 404                 return (route_distance(ZEBRA_ROUTE_STATIC));
 405         case ZEBRA_LSP_LDP:
 406                 return (route_distance(ZEBRA_ROUTE_LDP));
 407         case ZEBRA_LSP_BGP:
 408                 return (route_distance(ZEBRA_ROUTE_BGP));
 409         case ZEBRA_LSP_NONE:
 410         case ZEBRA_LSP_SHARP:
 411         case ZEBRA_LSP_SR:
 412                 return 150;
 413         }
 414
 415         /*
 416          * For some reason certain compilers do not believe
 417          * that all the cases have been handled.  And
 418          * WTF does this work differently than when I removed
 419          * the default case????
 420          */
 421         return 150;
 422 }
 423
 424 /*
 425  * Map RIB type to LSP type. Used when labeled-routes from BGP
 426  * are converted into LSPs.
 427  */
 428 static inline enum lsp_types_t lsp_type_from_re_type(int re_type)
 429 {
 430         switch (re_type) {
 431         case ZEBRA_ROUTE_STATIC:
 432                 return ZEBRA_LSP_STATIC;
 433         case ZEBRA_ROUTE_BGP:
 434                 return ZEBRA_LSP_BGP;
 435         case ZEBRA_ROUTE_SHARP:
 436                 return ZEBRA_LSP_SHARP;
 437         default:
 438                 return ZEBRA_LSP_NONE;
 439         }
 440 }
 441
 442 /*
 443  * Map LSP type to RIB type.
 444  */
 445 static inline int re_type_from_lsp_type(enum lsp_types_t lsp_type)
 446 {
 447         switch (lsp_type) {
 448         case ZEBRA_LSP_STATIC:
 449                 return ZEBRA_ROUTE_STATIC;
 450         case ZEBRA_LSP_LDP:
 451                 return ZEBRA_ROUTE_LDP;
 452         case ZEBRA_LSP_BGP:
 453                 return ZEBRA_ROUTE_BGP;
 454         case ZEBRA_LSP_SR:
 455                 return ZEBRA_ROUTE_OSPF;
 456         case ZEBRA_LSP_NONE:
 457                 return ZEBRA_ROUTE_KERNEL;
 458         case ZEBRA_LSP_SHARP:
 459                 return ZEBRA_ROUTE_SHARP;
 460         }
 461
 462         /*
 463          * For some reason certain compilers do not believe
 464          * that all the cases have been handled.  And
 465          * WTF does this work differently than when I removed
 466          * the default case????
 467          */
 468         return ZEBRA_ROUTE_KERNEL;
 469 }
 470
 471 /* NHLFE type as printable string. */
 472 static inline const char *nhlfe_type2str(enum lsp_types_t lsp_type)
 473 {
 474         switch (lsp_type) {
 475         case ZEBRA_LSP_STATIC:
 476                 return "Static";
 477         case ZEBRA_LSP_LDP:
 478                 return "LDP";
 479         case ZEBRA_LSP_BGP:
 480                 return "BGP";
 481         case ZEBRA_LSP_SR:
 482                 return "SR";
 483         case ZEBRA_LSP_SHARP:
 484                 return "SHARP";
 485         case ZEBRA_LSP_NONE:
 486                 return "Unknown";
 487         }
 488
 489         /*
 490          * For some reason certain compilers do not believe
 491          * that all the cases have been handled.  And
 492          * WTF does this work differently than when I removed
 493          * the default case????
 494          */
 495         return "Unknown";
 496 }
 497
 498 static inline void mpls_mark_lsps_for_processing(struct zebra_vrf *zvrf)
 499 {
 500         if (!zvrf)
 501                 return;
 502
 503         zvrf->mpls_flags |= MPLS_FLAG_SCHEDULE_LSPS;
 504 }
 505
 506 static inline void mpls_unmark_lsps_for_processing(struct zebra_vrf *zvrf)
 507 {
 508         if (!zvrf)
 509                 return;
 510
 511         zvrf->mpls_flags &= ~MPLS_FLAG_SCHEDULE_LSPS;
 512 }
 513
 514 static inline int mpls_should_lsps_be_processed(struct zebra_vrf *zvrf)
 515 {
 516         if (!zvrf)
 517                 return 0;
 518
 519         return ((zvrf->mpls_flags & MPLS_FLAG_SCHEDULE_LSPS) ? 1 : 0);
 520 }
 521
 522 /* Global variables. */
 523 extern int mpls_enabled;
 524
 525 #endif /*_ZEBRA_MPLS_H */