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