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_ipsec;
 152   u32 ip6_unicast_rx_feature_l2tp_decap;
 153   u32 ip6_unicast_rx_feature_vpath;
 154   u32 ip6_unicast_rx_feature_lookup;
 155
 156   /* Built-in multicast feature path indices */
 157   u32 ip6_multicast_rx_feature_vpath;
 158   u32 ip6_multicast_rx_feature_lookup;
 159
 160   /* Save results for show command */
 161   char ** feature_nodes[VNET_N_CAST];
 162
 163   /* Seed for Jenkins hash used to compute ip6 flow hash. */
 164   u32 flow_hash_seed;
 165
 166   struct {
 167     /* TTL to use for host generated packets. */
 168     u8 ttl;
 169
 170     u8 pad[3];
 171   } host_config;
 172
 173   /* HBH processing enabled? */
 174   u8 hbh_enabled;
 175 } ip6_main_t;
 176
 177 /* Global ip6 main structure. */
 178 extern ip6_main_t ip6_main;
 179
 180 #define VNET_IP6_UNICAST_FEATURE_INIT(x,...)                    \
 181   __VA_ARGS__ vnet_ip_feature_registration_t uc_##x;            \
 182 static void __vnet_add_feature_registration_uc_##x (void)       \
 183   __attribute__((__constructor__)) ;                            \
 184 static void __vnet_add_feature_registration_uc_##x (void)       \
 185 {                                                               \
 186   ip6_main_t * im = &ip6_main;                                  \
 187   uc_##x.next = im->next_uc_feature;                            \
 188   im->next_uc_feature = &uc_##x;                                \
 189 }                                                               \
 190 __VA_ARGS__ vnet_ip_feature_registration_t uc_##x
 191
 192 #define VNET_IP6_MULTICAST_FEATURE_INIT(x,...)                  \
 193   __VA_ARGS__ vnet_ip_feature_registration_t mc_##x;            \
 194 static void __vnet_add_feature_registration_mc_##x (void)       \
 195   __attribute__((__constructor__)) ;                            \
 196 static void __vnet_add_feature_registration_mc_##x (void)       \
 197 {                                                               \
 198   ip6_main_t * im = &ip6_main;                                  \
 199   mc_##x.next = im->next_mc_feature;                            \
 200   im->next_mc_feature = &mc_##x;                                \
 201 }                                                               \
 202 __VA_ARGS__ vnet_ip_feature_registration_t mc_##x
 203
 204 /* Global ip6 input node.  Errors get attached to ip6 input node. */
 205 extern vlib_node_registration_t ip6_input_node;
 206 extern vlib_node_registration_t ip6_rewrite_node;
 207 extern vlib_node_registration_t ip6_rewrite_local_node;
 208 extern vlib_node_registration_t ip6_discover_neighbor_node;
 209
 210 extern vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node;
 211
 212 /* ipv6 neighbor discovery - timer/event types */
 213 typedef enum {
 214   ICMP6_ND_EVENT_INIT,
 215 } ip6_icmp_neighbor_discovery_event_type_t;
 216
 217 typedef union {
 218   u32 add_del_swindex;
 219   struct {
 220     u32 up_down_swindex;
 221     u32 fib_index;
 222   } up_down_event;
 223 } ip6_icmp_neighbor_discovery_event_data_t;
 224
 225 u32 ip6_fib_lookup (ip6_main_t * im, u32 sw_if_index, ip6_address_t * dst);
 226 u32 ip6_fib_lookup_with_table (ip6_main_t * im, u32 fib_index,
 227                                ip6_address_t * dst);
 228
 229 /**
 230  * \brief Get or create an IPv6 fib.
 231  *
 232  * Get or create an IPv6 fib with the provided fib ID or index.
 233  * The fib ID is a possibly-sparse user-defined value while
 234  * the fib index defines the position of the fib in the fib vector.
 235  *
 236  * \param im
 237  *      ip6_main pointer.
 238  * \param table_index_or_id
 239  *      The table index if \c IP6_ROUTE_FLAG_FIB_INDEX bit is set in \p flags.
 240  *      Otherwise, when set to \c ~0, an arbitrary and unused fib ID is picked
 241  *      and can be retrieved with \c ret->table_id.
 242  *      Otherwise, it is the fib ID to be used to retrieve or create the desired fib.
 243  * \param flags
 244  *      Indicates whether \p table_index_or_id is the fib index or ID.
 245  *      When the bit \c IP6_ROUTE_FLAG_FIB_INDEX is set, \p table_index_or_id
 246  *      is considered as the fib index, and the fib ID otherwise.
 247  * \return A pointer to the retrieved or created fib.
 248  *
 249  * \remark When getting a fib with the fib index, the fib MUST already exist.
 250  */
 251 ip6_fib_t * find_ip6_fib_by_table_index_or_id (ip6_main_t * im,
 252                                                u32 table_index_or_id,
 253                                                u32 flags);
 254
 255 always_inline uword
 256 ip6_destination_matches_route (ip6_main_t * im,
 257                                ip6_address_t * key,
 258                                ip6_address_t * dest,
 259                                uword dest_length)
 260 {
 261   int i;
 262   for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
 263     {
 264       if ((key->as_uword[i] ^ dest->as_uword[i]) & im->fib_masks[dest_length].as_uword[i])
 265         return 0;
 266     }
 267   return 1;
 268 }
 269
 270 always_inline uword
 271 ip6_destination_matches_interface (ip6_main_t * im,
 272                                    ip6_address_t * key,
 273                                    ip_interface_address_t * ia)
 274 {
 275   ip6_address_t * a = ip_interface_address_get_address (&im->lookup_main, ia);
 276   return ip6_destination_matches_route (im, key, a, ia->address_length);
 277 }
 278
 279 /* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
 280 always_inline uword
 281 ip6_unaligned_destination_matches_route (ip6_main_t * im,
 282                                          ip6_address_t * key,
 283                                          ip6_address_t * dest,
 284                                          uword dest_length)
 285 {
 286   int i;
 287   for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
 288     {
 289       if ((clib_mem_unaligned (&key->as_uword[i], uword) ^ dest->as_uword[i]) & im->fib_masks[dest_length].as_uword[i])
 290         return 0;
 291     }
 292   return 1;
 293 }
 294
 295 always_inline int
 296 ip6_src_address_for_packet (ip6_main_t * im, vlib_buffer_t * p, ip6_address_t * src, u32 sw_if_index)
 297 {
 298   ip_lookup_main_t * lm = &im->lookup_main;
 299   ip_interface_address_t * ia = ip_interface_address_for_packet (lm, p, sw_if_index);
 300   if (ia == NULL)
 301     return -1;
 302   ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 303   *src = a[0];
 304   return 0;
 305 }
 306
 307 always_inline u32
 308 ip6_src_lookup_for_packet (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
 309 {
 310   if (vnet_buffer (b)->ip.adj_index[VLIB_RX] == ~0)
 311     vnet_buffer (b)->ip.adj_index[VLIB_RX]
 312       = ip6_fib_lookup (im, vnet_buffer (b)->sw_if_index[VLIB_RX],
 313                         &i->src_address);
 314   return vnet_buffer (b)->ip.adj_index[VLIB_RX];
 315 }
 316
 317 /* Find interface address which matches destination. */
 318 always_inline ip6_address_t *
 319 ip6_interface_address_matching_destination (ip6_main_t * im, ip6_address_t * dst, u32 sw_if_index,
 320                                             ip_interface_address_t ** result_ia)
 321 {
 322   ip_lookup_main_t * lm = &im->lookup_main;
 323   ip_interface_address_t * ia;
 324   ip6_address_t * result = 0;
 325
 326   foreach_ip_interface_address (lm, ia, sw_if_index,
 327                                 1 /* honor unnumbered */,
 328   ({
 329     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 330     if (ip6_destination_matches_route (im, dst, a, ia->address_length))
 331       {
 332         result = a;
 333         break;
 334       }
 335   }));
 336   if (result_ia)
 337     *result_ia = result ? ia : 0;
 338   return result;
 339 }
 340
 341 clib_error_t *
 342 ip6_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
 343                                ip6_address_t * address, u32 address_length,
 344                                u32 is_del);
 345
 346 int ip6_address_compare (ip6_address_t * a1, ip6_address_t * a2);
 347
 348 /* Add/del a route to the FIB. */
 349
 350 #define IP6_ROUTE_FLAG_ADD (0 << 0)
 351 #define IP6_ROUTE_FLAG_DEL (1 << 0)
 352 #define IP6_ROUTE_FLAG_TABLE_ID  (0 << 1)
 353 #define IP6_ROUTE_FLAG_FIB_INDEX (1 << 1)
 354 #define IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY (1 << 2)
 355 #define IP6_ROUTE_FLAG_NO_REDISTRIBUTE (1 << 3)
 356 #define IP6_ROUTE_FLAG_NOT_LAST_IN_GROUP (1 << 4)
 357 /* Dynamic route created via neighbor discovery. */
 358 #define IP6_ROUTE_FLAG_NEIGHBOR (1 << 5)
 359
 360 typedef struct {
 361   /* IP6_ROUTE_FLAG_* */
 362   u32 flags;
 363
 364   /* Either index of fib or table_id to hash and get fib.
 365      IP6_ROUTE_FLAG_FIB_INDEX specifies index; otherwise table_id is assumed. */
 366   u32 table_index_or_table_id;
 367
 368   /* Destination address (prefix) and length. */
 369   ip6_address_t dst_address;
 370   u32 dst_address_length;
 371
 372   /* Adjacency to use for this destination. */
 373   u32 adj_index;
 374
 375   /* If specified adjacencies to add and then
 376      use for this destination.  add_adj/n_add_adj
 377      are override adj_index if specified. */
 378   ip_adjacency_t * add_adj;
 379   u32 n_add_adj;
 380 } ip6_add_del_route_args_t;
 381
 382 void ip6_add_del_route (ip6_main_t * im, ip6_add_del_route_args_t * args);
 383
 384 void ip6_add_del_route_next_hop (ip6_main_t * im,
 385                                  u32 flags,
 386                                  ip6_address_t * dst_address,
 387                                  u32 dst_address_length,
 388                                  ip6_address_t * next_hop,
 389                                  u32 next_hop_sw_if_index,
 390                                  u32 next_hop_weight, u32 adj_index,
 391                                  u32 explicit_fib_index);
 392 u32
 393 ip6_get_route (ip6_main_t * im,
 394                u32 fib_index_or_table_id,
 395                u32 flags,
 396                ip6_address_t * address,
 397                u32 address_length);
 398
 399 void
 400 ip6_foreach_matching_route (ip6_main_t * im,
 401                             u32 table_index_or_table_id,
 402                             u32 flags,
 403                             ip6_address_t * address,
 404                             u32 address_length,
 405                             ip6_address_t ** results,
 406                             u8 ** result_length);
 407
 408 void ip6_delete_matching_routes (ip6_main_t * im,
 409                                  u32 table_index_or_table_id,
 410                                  u32 flags,
 411                                  ip6_address_t * address,
 412                                  u32 address_length);
 413
 414 void ip6_maybe_remap_adjacencies (ip6_main_t * im,
 415                                   u32 table_index_or_table_id,
 416                                   u32 flags);
 417
 418 void ip6_adjacency_set_interface_route (vnet_main_t * vnm,
 419                                         ip_adjacency_t * adj,
 420                                         u32 sw_if_index,
 421                                         u32 if_address_index);
 422
 423 u32
 424 vnet_ip6_neighbor_glean_add(u32 fib_index, void * next_hop_arg);
 425
 426 clib_error_t *
 427 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index);
 428
 429 clib_error_t *
 430 ip6_set_neighbor_limit (u32 neighbor_limit);
 431
 432 uword
 433 ip6_udp_register_listener (vlib_main_t * vm,
 434                            u16 dst_port,
 435                            u32 next_node_index);
 436
 437 u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp);
 438
 439 void ip6_register_protocol (u32 protocol, u32 node_index);
 440
 441 serialize_function_t serialize_vnet_ip6_main, unserialize_vnet_ip6_main;
 442
 443 int
 444 vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
 445                                 u32 sw_if_index,
 446                                 ip6_address_t * a,
 447                                 u8 * link_layer_address,
 448                                 uword n_bytes_link_layer_address,
 449                                 int is_static);
 450 int
 451 vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
 452                                   u32 sw_if_index,
 453                                   ip6_address_t * a,
 454                                   u8 * link_layer_address,
 455                                   uword n_bytes_link_layer_address);
 456 void
 457 vnet_ip6_fib_init (ip6_main_t * im, u32 fib_index);
 458
 459 void
 460 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t *ip,
 461                                                   u8 *mac);
 462
 463 void
 464 ip6_ethernet_mac_address_from_link_local_address (u8 *mac,
 465                                                   ip6_address_t *ip);
 466
 467 int vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config);
 468
 469 int
 470 ip6_neighbor_ra_config(vlib_main_t * vm, u32 sw_if_index,
 471                        u8 surpress, u8 managed, u8 other,
 472                        u8 ll_option,  u8 send_unicast,  u8 cease,
 473                        u8 use_lifetime,  u32 lifetime,
 474                        u32 initial_count,  u32 initial_interval,
 475                        u32 max_interval,  u32 min_interval,
 476                        u8 is_no);
 477
 478 int
 479 ip6_neighbor_ra_prefix(vlib_main_t * vm, u32 sw_if_index,
 480                        ip6_address_t *prefix_addr,  u8 prefix_len,
 481                        u8 use_default,  u32 val_lifetime, u32 pref_lifetime,
 482                        u8 no_advertise,  u8 off_link, u8 no_autoconfig, u8 no_onlink,
 483                        u8 is_no);
 484
 485
 486 clib_error_t *
 487 enable_ip6_interface(vlib_main_t * vm,
 488                      u32 sw_if_index);
 489
 490 clib_error_t *
 491 disable_ip6_interface(vlib_main_t * vm,
 492                      u32 sw_if_index);
 493
 494 int
 495 ip6_interface_enabled(vlib_main_t * vm,
 496                       u32 sw_if_index);
 497
 498 clib_error_t *
 499 set_ip6_link_local_address(vlib_main_t * vm,
 500                            u32 sw_if_index,
 501                            ip6_address_t *address,
 502                            u8 address_length);
 503
 504 void vnet_register_ip6_neighbor_resolution_event(vnet_main_t * vnm,
 505                                                  void * address_arg,
 506                                                  uword node_index,
 507                                                  uword type_opaque,
 508                                                  uword data);
 509
 510 int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
 511                                  u32 table_index);
 512 extern vlib_node_registration_t ip6_lookup_node;
 513
 514 /* Compute flow hash.  We'll use it to select which Sponge to use for this
 515    flow.  And other things. */
 516 always_inline u32
 517 ip6_compute_flow_hash (ip6_header_t * ip, u32 flow_hash_config)
 518 {
 519     tcp_header_t * tcp = (void *) (ip + 1);
 520     u64 a, b, c;
 521     u64 t1, t2;
 522     uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
 523                         || ip->protocol == IP_PROTOCOL_UDP);
 524
 525     t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]);
 526     t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0;
 527
 528     t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]);
 529     t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 0;
 530
 531     a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
 532     b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
 533     b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
 534
 535     t1 = is_tcp_udp ? tcp->ports.src : 0;
 536     t2 = is_tcp_udp ? tcp->ports.dst : 0;
 537
 538     t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
 539     t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
 540
 541     c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
 542         ((t1<<16) | t2) : ((t2<<16) | t1);
 543
 544     hash_mix64 (a, b, c);
 545     return (u32) c;
 546 }
 547
 548 /*
 549  * Hop-by-Hop handling
 550  */
 551 typedef struct {
 552   /* Array of function pointers to HBH option handling routines */
 553   int (*options[256])(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt);
 554   u8 *(*trace[256])(u8 *s, ip6_hop_by_hop_option_t *opt);
 555 } ip6_hop_by_hop_main_t;
 556
 557 extern ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
 558
 559 int ip6_hbh_register_option (u8 option,
 560                              int options(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt),
 561                              u8 *trace(u8 *s, ip6_hop_by_hop_option_t *opt));
 562 int ip6_hbh_unregister_option (u8 option);
 563
 564 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
 565 #define OI_DECAP   100
 566
 567 #endif /* included_ip_ip6_h */