vnet/vnet/ip/ip6.h

   1 /*
   2  * Copyright (c) 2015 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /*
  16  * ip/ip6.h: ip6 main include file
  17  *
  18  * Copyright (c) 2008 Eliot Dresselhaus
  19  *
  20  * Permission is hereby granted, free of charge, to any person obtaining
  21  * a copy of this software and associated documentation files (the
  22  * "Software"), to deal in the Software without restriction, including
  23  * without limitation the rights to use, copy, modify, merge, publish,
  24  * distribute, sublicense, and/or sell copies of the Software, and to
  25  * permit persons to whom the Software is furnished to do so, subject to
  26  * the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be
  29  * included in all copies or substantial portions of the Software.
  30  *
  31  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  32  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  33  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  34  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  35  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  36  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  37  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  38  */
  39
  40 #ifndef included_ip_ip6_h
  41 #define included_ip_ip6_h
  42
  43 #include <vlib/mc.h>
  44 #include <vnet/ip/ip6_packet.h>
  45 #include <vnet/ip/ip6_hop_by_hop_packet.h>
  46 #include <vnet/ip/lookup.h>
  47 #include <vnet/ip/ip_feature_registration.h>
  48 #include <stdbool.h>
  49 #include <vppinfra/bihash_24_8.h>
  50 #include <vppinfra/bihash_template.h>
  51
  52 /*
  53  * Default size of the ip6 fib hash table
  54  */
  55 #define IP6_FIB_DEFAULT_HASH_NUM_BUCKETS (64 * 1024)
  56 #define IP6_FIB_DEFAULT_HASH_MEMORY_SIZE (32<<20)
  57
  58 typedef struct {
  59   ip6_address_t addr;
  60   u32 dst_address_length;
  61   u32 vrf_index;
  62 } ip6_fib_key_t;
  63
  64 typedef struct {
  65   /* Table ID (hash key) for this FIB. */
  66   u32 table_id;
  67
  68   /* Index into FIB vector. */
  69   u32 index;
  70
  71   /* flow hash configuration */
  72   u32 flow_hash_config;
  73 } ip6_fib_t;
  74
  75 struct ip6_main_t;
  76
  77 typedef void (ip6_add_del_route_function_t)
  78   (struct ip6_main_t * im,
  79    uword opaque,
  80    ip6_fib_t * fib,
  81    u32 flags,
  82    ip6_address_t * address,
  83    u32 address_length,
  84    void * old_result,
  85    void * new_result);
  86
  87 typedef struct {
  88   ip6_add_del_route_function_t * function;
  89   uword required_flags;
  90   uword function_opaque;
  91 } ip6_add_del_route_callback_t;
  92
  93 typedef void (ip6_add_del_interface_address_function_t)
  94   (struct ip6_main_t * im,
  95    uword opaque,
  96    u32 sw_if_index,
  97    ip6_address_t * address,
  98    u32 address_length,
  99    u32 if_address_index,
 100    u32 is_del);
 101
 102 typedef struct {
 103   ip6_add_del_interface_address_function_t * function;
 104   uword function_opaque;
 105 } ip6_add_del_interface_address_callback_t;
 106
 107 typedef struct ip6_main_t {
 108   BVT(clib_bihash) ip6_lookup_table;
 109
 110   ip_lookup_main_t lookup_main;
 111
 112   /* bitmap / refcounts / vector of mask widths to search */
 113   uword * non_empty_dst_address_length_bitmap;
 114   u8 * prefix_lengths_in_search_order;
 115   i32 dst_address_length_refcounts[129];
 116
 117   /* Vector of FIBs. */
 118   ip6_fib_t * fibs;
 119
 120   ip6_address_t fib_masks[129];
 121
 122   /* Table index indexed by software interface. */
 123   u32 * fib_index_by_sw_if_index;
 124
 125   /* Hash table mapping table id to fib index.
 126      ID space is not necessarily dense; index space is dense. */
 127   uword * fib_index_by_table_id;
 128
 129   /* Vector of functions to call when routes are added/deleted. */
 130   ip6_add_del_route_callback_t * add_del_route_callbacks;
 131
 132   /* Hash table mapping interface rewrite adjacency index by sw if index. */
 133   uword * interface_route_adj_index_by_sw_if_index;
 134
 135   /* Functions to call when interface address changes. */
 136   ip6_add_del_interface_address_callback_t * add_del_interface_address_callbacks;
 137
 138   /* Template used to generate IP6 neighbor solicitation packets. */
 139   vlib_packet_template_t discover_neighbor_packet_template;
 140
 141   /* ip6 lookup table config parameters */
 142   u32 lookup_table_nbuckets;
 143   uword lookup_table_size;
 144
 145   /* feature path configuration lists */
 146   vnet_ip_feature_registration_t * next_uc_feature;
 147   vnet_ip_feature_registration_t * next_mc_feature;
 148
 149   /* Built-in unicast feature path indices, see ip_feature_init_cast(...)  */
 150   u32 ip6_unicast_rx_feature_check_access;
 151   u32 ip6_unicast_rx_feature_policer_classify;
 152   u32 ip6_unicast_rx_feature_ipsec;
 153   u32 ip6_unicast_rx_feature_l2tp_decap;
 154   u32 ip6_unicast_rx_feature_vpath;
 155   u32 ip6_unicast_rx_feature_lookup;
 156
 157   /* Built-in multicast feature path indices */
 158   u32 ip6_multicast_rx_feature_vpath;
 159   u32 ip6_multicast_rx_feature_lookup;
 160
 161   /* Save results for show command */
 162   char ** feature_nodes[VNET_N_CAST];
 163
 164   /* Seed for Jenkins hash used to compute ip6 flow hash. */
 165   u32 flow_hash_seed;
 166
 167   struct {
 168     /* TTL to use for host generated packets. */
 169     u8 ttl;
 170
 171     u8 pad[3];
 172   } host_config;
 173
 174   /* HBH processing enabled? */
 175   u8 hbh_enabled;
 176 } ip6_main_t;
 177
 178 /* Global ip6 main structure. */
 179 extern ip6_main_t ip6_main;
 180
 181 #define VNET_IP6_UNICAST_FEATURE_INIT(x,...)                    \
 182   __VA_ARGS__ vnet_ip_feature_registration_t uc_##x;            \
 183 static void __vnet_add_feature_registration_uc_##x (void)       \
 184   __attribute__((__constructor__)) ;                            \
 185 static void __vnet_add_feature_registration_uc_##x (void)       \
 186 {                                                               \
 187   ip6_main_t * im = &ip6_main;                                  \
 188   uc_##x.next = im->next_uc_feature;                            \
 189   im->next_uc_feature = &uc_##x;                                \
 190 }                                                               \
 191 __VA_ARGS__ vnet_ip_feature_registration_t uc_##x
 192
 193 #define VNET_IP6_MULTICAST_FEATURE_INIT(x,...)                  \
 194   __VA_ARGS__ vnet_ip_feature_registration_t mc_##x;            \
 195 static void __vnet_add_feature_registration_mc_##x (void)       \
 196   __attribute__((__constructor__)) ;                            \
 197 static void __vnet_add_feature_registration_mc_##x (void)       \
 198 {                                                               \
 199   ip6_main_t * im = &ip6_main;                                  \
 200   mc_##x.next = im->next_mc_feature;                            \
 201   im->next_mc_feature = &mc_##x;                                \
 202 }                                                               \
 203 __VA_ARGS__ vnet_ip_feature_registration_t mc_##x
 204
 205 /* Global ip6 input node.  Errors get attached to ip6 input node. */
 206 extern vlib_node_registration_t ip6_input_node;
 207 extern vlib_node_registration_t ip6_rewrite_node;
 208 extern vlib_node_registration_t ip6_rewrite_local_node;
 209 extern vlib_node_registration_t ip6_discover_neighbor_node;
 210
 211 extern vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node;
 212
 213 /* ipv6 neighbor discovery - timer/event types */
 214 typedef enum {
 215   ICMP6_ND_EVENT_INIT,
 216 } ip6_icmp_neighbor_discovery_event_type_t;
 217
 218 typedef union {
 219   u32 add_del_swindex;
 220   struct {
 221     u32 up_down_swindex;
 222     u32 fib_index;
 223   } up_down_event;
 224 } ip6_icmp_neighbor_discovery_event_data_t;
 225
 226 u32 ip6_fib_lookup (ip6_main_t * im, u32 sw_if_index, ip6_address_t * dst);
 227 u32 ip6_fib_lookup_with_table (ip6_main_t * im, u32 fib_index,
 228                                ip6_address_t * dst);
 229
 230 /**
 231  * \brief Get or create an IPv6 fib.
 232  *
 233  * Get or create an IPv6 fib with the provided fib ID or index.
 234  * The fib ID is a possibly-sparse user-defined value while
 235  * the fib index defines the position of the fib in the fib vector.
 236  *
 237  * \param im
 238  *      ip6_main pointer.
 239  * \param table_index_or_id
 240  *      The table index if \c IP6_ROUTE_FLAG_FIB_INDEX bit is set in \p flags.
 241  *      Otherwise, when set to \c ~0, an arbitrary and unused fib ID is picked
 242  *      and can be retrieved with \c ret->table_id.
 243  *      Otherwise, it is the fib ID to be used to retrieve or create the desired fib.
 244  * \param flags
 245  *      Indicates whether \p table_index_or_id is the fib index or ID.
 246  *      When the bit \c IP6_ROUTE_FLAG_FIB_INDEX is set, \p table_index_or_id
 247  *      is considered as the fib index, and the fib ID otherwise.
 248  * \return A pointer to the retrieved or created fib.
 249  *
 250  * \remark When getting a fib with the fib index, the fib MUST already exist.
 251  */
 252 ip6_fib_t * find_ip6_fib_by_table_index_or_id (ip6_main_t * im,
 253                                                u32 table_index_or_id,
 254                                                u32 flags);
 255
 256 always_inline uword
 257 ip6_destination_matches_route (ip6_main_t * im,
 258                                ip6_address_t * key,
 259                                ip6_address_t * dest,
 260                                uword dest_length)
 261 {
 262   int i;
 263   for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
 264     {
 265       if ((key->as_uword[i] ^ dest->as_uword[i]) & im->fib_masks[dest_length].as_uword[i])
 266         return 0;
 267     }
 268   return 1;
 269 }
 270
 271 always_inline uword
 272 ip6_destination_matches_interface (ip6_main_t * im,
 273                                    ip6_address_t * key,
 274                                    ip_interface_address_t * ia)
 275 {
 276   ip6_address_t * a = ip_interface_address_get_address (&im->lookup_main, ia);
 277   return ip6_destination_matches_route (im, key, a, ia->address_length);
 278 }
 279
 280 /* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
 281 always_inline uword
 282 ip6_unaligned_destination_matches_route (ip6_main_t * im,
 283                                          ip6_address_t * key,
 284                                          ip6_address_t * dest,
 285                                          uword dest_length)
 286 {
 287   int i;
 288   for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
 289     {
 290       if ((clib_mem_unaligned (&key->as_uword[i], uword) ^ dest->as_uword[i]) & im->fib_masks[dest_length].as_uword[i])
 291         return 0;
 292     }
 293   return 1;
 294 }
 295
 296 always_inline int
 297 ip6_src_address_for_packet (ip6_main_t * im, vlib_buffer_t * p, ip6_address_t * src, u32 sw_if_index)
 298 {
 299   ip_lookup_main_t * lm = &im->lookup_main;
 300   ip_interface_address_t * ia = ip_interface_address_for_packet (lm, p, sw_if_index);
 301   if (ia == NULL)
 302     return -1;
 303   ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 304   *src = a[0];
 305   return 0;
 306 }
 307
 308 always_inline u32
 309 ip6_src_lookup_for_packet (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
 310 {
 311   if (vnet_buffer (b)->ip.adj_index[VLIB_RX] == ~0)
 312     vnet_buffer (b)->ip.adj_index[VLIB_RX]
 313       = ip6_fib_lookup (im, vnet_buffer (b)->sw_if_index[VLIB_RX],
 314                         &i->src_address);
 315   return vnet_buffer (b)->ip.adj_index[VLIB_RX];
 316 }
 317
 318 /* Find interface address which matches destination. */
 319 always_inline ip6_address_t *
 320 ip6_interface_address_matching_destination (ip6_main_t * im, ip6_address_t * dst, u32 sw_if_index,
 321                                             ip_interface_address_t ** result_ia)
 322 {
 323   ip_lookup_main_t * lm = &im->lookup_main;
 324   ip_interface_address_t * ia;
 325   ip6_address_t * result = 0;
 326
 327   foreach_ip_interface_address (lm, ia, sw_if_index,
 328                                 1 /* honor unnumbered */,
 329   ({
 330     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 331     if (ip6_destination_matches_route (im, dst, a, ia->address_length))
 332       {
 333         result = a;
 334         break;
 335       }
 336   }));
 337   if (result_ia)
 338     *result_ia = result ? ia : 0;
 339   return result;
 340 }
 341
 342 clib_error_t *
 343 ip6_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
 344                                ip6_address_t * address, u32 address_length,
 345                                u32 is_del);
 346
 347 int ip6_address_compare (ip6_address_t * a1, ip6_address_t * a2);
 348
 349 /* Add/del a route to the FIB. */
 350
 351 #define IP6_ROUTE_FLAG_ADD (0 << 0)
 352 #define IP6_ROUTE_FLAG_DEL (1 << 0)
 353 #define IP6_ROUTE_FLAG_TABLE_ID  (0 << 1)
 354 #define IP6_ROUTE_FLAG_FIB_INDEX (1 << 1)
 355 #define IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY (1 << 2)
 356 #define IP6_ROUTE_FLAG_NO_REDISTRIBUTE (1 << 3)
 357 #define IP6_ROUTE_FLAG_NOT_LAST_IN_GROUP (1 << 4)
 358 /* Dynamic route created via neighbor discovery. */
 359 #define IP6_ROUTE_FLAG_NEIGHBOR (1 << 5)
 360
 361 typedef struct {
 362   /* IP6_ROUTE_FLAG_* */
 363   u32 flags;
 364
 365   /* Either index of fib or table_id to hash and get fib.
 366      IP6_ROUTE_FLAG_FIB_INDEX specifies index; otherwise table_id is assumed. */
 367   u32 table_index_or_table_id;
 368
 369   /* Destination address (prefix) and length. */
 370   ip6_address_t dst_address;
 371   u32 dst_address_length;
 372
 373   /* Adjacency to use for this destination. */
 374   u32 adj_index;
 375
 376   /* If specified adjacencies to add and then
 377      use for this destination.  add_adj/n_add_adj
 378      are override adj_index if specified. */
 379   ip_adjacency_t * add_adj;
 380   u32 n_add_adj;
 381 } ip6_add_del_route_args_t;
 382
 383 void ip6_add_del_route (ip6_main_t * im, ip6_add_del_route_args_t * args);
 384
 385 void ip6_add_del_route_next_hop (ip6_main_t * im,
 386                                  u32 flags,
 387                                  ip6_address_t * dst_address,
 388                                  u32 dst_address_length,
 389                                  ip6_address_t * next_hop,
 390                                  u32 next_hop_sw_if_index,
 391                                  u32 next_hop_weight, u32 adj_index,
 392                                  u32 explicit_fib_index);
 393
 394 u32
 395 ip6_route_get_next_hop_adj (ip6_main_t * im,
 396                             u32 fib_index,
 397                             ip6_address_t *next_hop,
 398                             u32 next_hop_sw_if_index,
 399                             u32 explicit_fib_index);
 400
 401 u32
 402 ip6_get_route (ip6_main_t * im,
 403                u32 fib_index_or_table_id,
 404                u32 flags,
 405                ip6_address_t * address,
 406                u32 address_length);
 407
 408 void
 409 ip6_foreach_matching_route (ip6_main_t * im,
 410                             u32 table_index_or_table_id,
 411                             u32 flags,
 412                             ip6_address_t * address,
 413                             u32 address_length,
 414                             ip6_address_t ** results,
 415                             u8 ** result_length);
 416
 417 void ip6_delete_matching_routes (ip6_main_t * im,
 418                                  u32 table_index_or_table_id,
 419                                  u32 flags,
 420                                  ip6_address_t * address,
 421                                  u32 address_length);
 422
 423 void ip6_maybe_remap_adjacencies (ip6_main_t * im,
 424                                   u32 table_index_or_table_id,
 425                                   u32 flags);
 426
 427 void ip6_adjacency_set_interface_route (vnet_main_t * vnm,
 428                                         ip_adjacency_t * adj,
 429                                         u32 sw_if_index,
 430                                         u32 if_address_index);
 431
 432 u32
 433 vnet_ip6_neighbor_glean_add(u32 fib_index, void * next_hop_arg);
 434
 435 clib_error_t *
 436 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index);
 437
 438 clib_error_t *
 439 ip6_set_neighbor_limit (u32 neighbor_limit);
 440
 441 uword
 442 ip6_udp_register_listener (vlib_main_t * vm,
 443                            u16 dst_port,
 444                            u32 next_node_index);
 445
 446 u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp);
 447
 448 void ip6_register_protocol (u32 protocol, u32 node_index);
 449
 450 serialize_function_t serialize_vnet_ip6_main, unserialize_vnet_ip6_main;
 451
 452 int
 453 vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
 454                                 u32 sw_if_index,
 455                                 ip6_address_t * a,
 456                                 u8 * link_layer_address,
 457                                 uword n_bytes_link_layer_address,
 458                                 int is_static);
 459 int
 460 vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
 461                                   u32 sw_if_index,
 462                                   ip6_address_t * a,
 463                                   u8 * link_layer_address,
 464                                   uword n_bytes_link_layer_address);
 465 void
 466 vnet_ip6_fib_init (ip6_main_t * im, u32 fib_index);
 467
 468 void
 469 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t *ip,
 470                                                   u8 *mac);
 471
 472 void
 473 ip6_ethernet_mac_address_from_link_local_address (u8 *mac,
 474                                                   ip6_address_t *ip);
 475
 476 int vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config);
 477
 478 int
 479 ip6_neighbor_ra_config(vlib_main_t * vm, u32 sw_if_index,
 480                        u8 suppress, u8 managed, u8 other,
 481                        u8 ll_option,  u8 send_unicast,  u8 cease,
 482                        u8 use_lifetime,  u32 lifetime,
 483                        u32 initial_count,  u32 initial_interval,
 484                        u32 max_interval,  u32 min_interval,
 485                        u8 is_no);
 486
 487 int
 488 ip6_neighbor_ra_prefix(vlib_main_t * vm, u32 sw_if_index,
 489                        ip6_address_t *prefix_addr,  u8 prefix_len,
 490                        u8 use_default,  u32 val_lifetime, u32 pref_lifetime,
 491                        u8 no_advertise,  u8 off_link, u8 no_autoconfig, u8 no_onlink,
 492                        u8 is_no);
 493
 494
 495 clib_error_t *
 496 enable_ip6_interface(vlib_main_t * vm,
 497                      u32 sw_if_index);
 498
 499 clib_error_t *
 500 disable_ip6_interface(vlib_main_t * vm,
 501                      u32 sw_if_index);
 502
 503 int
 504 ip6_interface_enabled(vlib_main_t * vm,
 505                       u32 sw_if_index);
 506
 507 clib_error_t *
 508 set_ip6_link_local_address(vlib_main_t * vm,
 509                            u32 sw_if_index,
 510                            ip6_address_t *address,
 511                            u8 address_length);
 512
 513 void vnet_register_ip6_neighbor_resolution_event(vnet_main_t * vnm,
 514                                                  void * address_arg,
 515                                                  uword node_index,
 516                                                  uword type_opaque,
 517                                                  uword data);
 518
 519 int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
 520                                  u32 table_index);
 521 extern vlib_node_registration_t ip6_lookup_node;
 522
 523 /* Compute flow hash.  We'll use it to select which Sponge to use for this
 524    flow.  And other things. */
 525 always_inline u32
 526 ip6_compute_flow_hash (ip6_header_t * ip, u32 flow_hash_config)
 527 {
 528     tcp_header_t * tcp = (void *) (ip + 1);
 529     u64 a, b, c;
 530     u64 t1, t2;
 531     uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
 532                         || ip->protocol == IP_PROTOCOL_UDP);
 533
 534     t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]);
 535     t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0;
 536
 537     t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]);
 538     t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 0;
 539
 540     a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
 541     b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
 542     b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
 543
 544     t1 = is_tcp_udp ? tcp->ports.src : 0;
 545     t2 = is_tcp_udp ? tcp->ports.dst : 0;
 546
 547     t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
 548     t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
 549
 550     c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
 551         ((t1<<16) | t2) : ((t2<<16) | t1);
 552
 553     hash_mix64 (a, b, c);
 554     return (u32) c;
 555 }
 556
 557 /*
 558  * Hop-by-Hop handling
 559  */
 560 typedef struct {
 561   /* Array of function pointers to HBH option handling routines */
 562   int (*options[256])(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt);
 563   u8 *(*trace[256])(u8 *s, ip6_hop_by_hop_option_t *opt);
 564 } ip6_hop_by_hop_main_t;
 565
 566 extern ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
 567
 568 int ip6_hbh_register_option (u8 option,
 569                              int options(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt),
 570                              u8 *trace(u8 *s, ip6_hop_by_hop_option_t *opt));
 571 int ip6_hbh_unregister_option (u8 option);
 572
 573 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
 574 #define OI_DECAP   100
 575
 576 #endif /* included_ip_ip6_h */