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 <vlib/buffer.h>
  45 #include <vnet/ethernet/packet.h>
  46 #include <vnet/ip/ip6_packet.h>
  47 #include <vnet/ip/ip6_hop_by_hop_packet.h>
  48 #include <vnet/ip/lookup.h>
  49 #include <vnet/ip/ip_feature_registration.h>
  50 #include <stdbool.h>
  51 #include <vppinfra/bihash_24_8.h>
  52 #include <vppinfra/bihash_template.h>
  53
  54 /*
  55  * Default size of the ip6 fib hash table
  56  */
  57 #define IP6_FIB_DEFAULT_HASH_NUM_BUCKETS (64 * 1024)
  58 #define IP6_FIB_DEFAULT_HASH_MEMORY_SIZE (32<<20)
  59
  60 typedef struct {
  61   ip6_address_t addr;
  62   u32 dst_address_length;
  63   u32 vrf_index;
  64 } ip6_fib_key_t;
  65
  66 typedef struct {
  67   /* Table ID (hash key) for this FIB. */
  68   u32 table_id;
  69
  70   /* Index into FIB vector. */
  71   u32 index;
  72
  73   /* flow hash configuration */
  74   u32 flow_hash_config;
  75 } ip6_fib_t;
  76
  77 struct ip6_main_t;
  78
  79 typedef void (ip6_add_del_route_function_t)
  80   (struct ip6_main_t * im,
  81    uword opaque,
  82    ip6_fib_t * fib,
  83    u32 flags,
  84    ip6_address_t * address,
  85    u32 address_length,
  86    void * old_result,
  87    void * new_result);
  88
  89 typedef struct {
  90   ip6_add_del_route_function_t * function;
  91   uword required_flags;
  92   uword function_opaque;
  93 } ip6_add_del_route_callback_t;
  94
  95 typedef void (ip6_add_del_interface_address_function_t)
  96   (struct ip6_main_t * im,
  97    uword opaque,
  98    u32 sw_if_index,
  99    ip6_address_t * address,
 100    u32 address_length,
 101    u32 if_address_index,
 102    u32 is_del);
 103
 104 typedef struct {
 105   ip6_add_del_interface_address_function_t * function;
 106   uword function_opaque;
 107 } ip6_add_del_interface_address_callback_t;
 108
 109 typedef struct ip6_main_t {
 110   BVT(clib_bihash) ip6_lookup_table;
 111
 112   ip_lookup_main_t lookup_main;
 113
 114   /* bitmap / refcounts / vector of mask widths to search */
 115   uword * non_empty_dst_address_length_bitmap;
 116   u8 * prefix_lengths_in_search_order;
 117   i32 dst_address_length_refcounts[129];
 118
 119   /* Vector of FIBs. */
 120   ip6_fib_t * fibs;
 121
 122   ip6_address_t fib_masks[129];
 123
 124   /* Table index indexed by software interface. */
 125   u32 * fib_index_by_sw_if_index;
 126
 127   /* Hash table mapping table id to fib index.
 128      ID space is not necessarily dense; index space is dense. */
 129   uword * fib_index_by_table_id;
 130
 131   /* Vector of functions to call when routes are added/deleted. */
 132   ip6_add_del_route_callback_t * add_del_route_callbacks;
 133
 134   /* Hash table mapping interface rewrite adjacency index by sw if index. */
 135   uword * interface_route_adj_index_by_sw_if_index;
 136
 137   /* Functions to call when interface address changes. */
 138   ip6_add_del_interface_address_callback_t * add_del_interface_address_callbacks;
 139
 140   /* Template used to generate IP6 neighbor solicitation packets. */
 141   vlib_packet_template_t discover_neighbor_packet_template;
 142
 143   /* ip6 lookup table config parameters */
 144   u32 lookup_table_nbuckets;
 145   uword lookup_table_size;
 146
 147   /* feature path configuration lists */
 148   vnet_ip_feature_registration_t * next_uc_feature;
 149   vnet_ip_feature_registration_t * next_mc_feature;
 150   vnet_ip_feature_registration_t * next_tx_feature;
 151
 152   /* Built-in unicast feature path indices, see ip_feature_init_cast(...)  */
 153   u32 ip6_unicast_rx_feature_check_access;
 154   u32 ip6_unicast_rx_feature_policer_classify;
 155   u32 ip6_unicast_rx_feature_ipsec;
 156   u32 ip6_unicast_rx_feature_l2tp_decap;
 157   u32 ip6_unicast_rx_feature_vpath;
 158   u32 ip6_unicast_rx_feature_lookup;
 159
 160   /* Built-in multicast feature path indices */
 161   u32 ip6_multicast_rx_feature_vpath;
 162   u32 ip6_multicast_rx_feature_lookup;
 163
 164   /* Built-in tx feature path index */
 165   u32 ip6_tx_feature_interface_output;
 166
 167   /* Save results for show command */
 168   char ** feature_nodes[VNET_N_IP_FEAT];
 169
 170   /* Seed for Jenkins hash used to compute ip6 flow hash. */
 171   u32 flow_hash_seed;
 172
 173   struct {
 174     /* TTL to use for host generated packets. */
 175     u8 ttl;
 176
 177     u8 pad[3];
 178   } host_config;
 179
 180   /* HBH processing enabled? */
 181   u8 hbh_enabled;
 182 } ip6_main_t;
 183
 184 /* Global ip6 main structure. */
 185 extern ip6_main_t ip6_main;
 186
 187 #define VNET_IP6_UNICAST_FEATURE_INIT(x,...)                    \
 188   __VA_ARGS__ vnet_ip_feature_registration_t uc_##x;            \
 189 static void __vnet_add_feature_registration_uc_##x (void)       \
 190   __attribute__((__constructor__)) ;                            \
 191 static void __vnet_add_feature_registration_uc_##x (void)       \
 192 {                                                               \
 193   ip6_main_t * im = &ip6_main;                                  \
 194   uc_##x.next = im->next_uc_feature;                            \
 195   im->next_uc_feature = &uc_##x;                                \
 196 }                                                               \
 197 __VA_ARGS__ vnet_ip_feature_registration_t uc_##x
 198
 199 #define VNET_IP6_MULTICAST_FEATURE_INIT(x,...)                  \
 200   __VA_ARGS__ vnet_ip_feature_registration_t mc_##x;            \
 201 static void __vnet_add_feature_registration_mc_##x (void)       \
 202   __attribute__((__constructor__)) ;                            \
 203 static void __vnet_add_feature_registration_mc_##x (void)       \
 204 {                                                               \
 205   ip6_main_t * im = &ip6_main;                                  \
 206   mc_##x.next = im->next_mc_feature;                            \
 207   im->next_mc_feature = &mc_##x;                                \
 208 }                                                               \
 209 __VA_ARGS__ vnet_ip_feature_registration_t mc_##x
 210
 211 #define VNET_IP6_TX_FEATURE_INIT(x,...)                         \
 212   __VA_ARGS__ vnet_ip_feature_registration_t tx_##x;            \
 213 static void __vnet_add_feature_registration_tx_##x (void)       \
 214   __attribute__((__constructor__)) ;                            \
 215 static void __vnet_add_feature_registration_tx_##x (void)       \
 216 {                                                               \
 217   ip6_main_t * im = &ip6_main;                                  \
 218   tx_##x.next = im->next_tx_feature;                            \
 219   im->next_tx_feature = &tx_##x;                                \
 220 }                                                               \
 221 __VA_ARGS__ vnet_ip_feature_registration_t tx_##x
 222
 223
 224 /* Global ip6 input node.  Errors get attached to ip6 input node. */
 225 extern vlib_node_registration_t ip6_input_node;
 226 extern vlib_node_registration_t ip6_rewrite_node;
 227 extern vlib_node_registration_t ip6_rewrite_local_node;
 228 extern vlib_node_registration_t ip6_discover_neighbor_node;
 229
 230 extern vlib_node_registration_t ip6_icmp_neighbor_discovery_event_node;
 231
 232 /* ipv6 neighbor discovery - timer/event types */
 233 typedef enum {
 234   ICMP6_ND_EVENT_INIT,
 235 } ip6_icmp_neighbor_discovery_event_type_t;
 236
 237 typedef union {
 238   u32 add_del_swindex;
 239   struct {
 240     u32 up_down_swindex;
 241     u32 fib_index;
 242   } up_down_event;
 243 } ip6_icmp_neighbor_discovery_event_data_t;
 244
 245 u32 ip6_fib_lookup (ip6_main_t * im, u32 sw_if_index, ip6_address_t * dst);
 246 u32 ip6_fib_lookup_with_table (ip6_main_t * im, u32 fib_index,
 247                                ip6_address_t * dst);
 248
 249 /**
 250  * \brief Get or create an IPv6 fib.
 251  *
 252  * Get or create an IPv6 fib with the provided fib ID or index.
 253  * The fib ID is a possibly-sparse user-defined value while
 254  * the fib index defines the position of the fib in the fib vector.
 255  *
 256  * \param im
 257  *      ip6_main pointer.
 258  * \param table_index_or_id
 259  *      The table index if \c IP6_ROUTE_FLAG_FIB_INDEX bit is set in \p flags.
 260  *      Otherwise, when set to \c ~0, an arbitrary and unused fib ID is picked
 261  *      and can be retrieved with \c ret->table_id.
 262  *      Otherwise, it is the fib ID to be used to retrieve or create the desired fib.
 263  * \param flags
 264  *      Indicates whether \p table_index_or_id is the fib index or ID.
 265  *      When the bit \c IP6_ROUTE_FLAG_FIB_INDEX is set, \p table_index_or_id
 266  *      is considered as the fib index, and the fib ID otherwise.
 267  * \return A pointer to the retrieved or created fib.
 268  *
 269  * \remark When getting a fib with the fib index, the fib MUST already exist.
 270  */
 271 ip6_fib_t * find_ip6_fib_by_table_index_or_id (ip6_main_t * im,
 272                                                u32 table_index_or_id,
 273                                                u32 flags);
 274
 275 always_inline uword
 276 ip6_destination_matches_route (ip6_main_t * im,
 277                                ip6_address_t * key,
 278                                ip6_address_t * dest,
 279                                uword dest_length)
 280 {
 281   int i;
 282   for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
 283     {
 284       if ((key->as_uword[i] ^ dest->as_uword[i]) & im->fib_masks[dest_length].as_uword[i])
 285         return 0;
 286     }
 287   return 1;
 288 }
 289
 290 always_inline uword
 291 ip6_destination_matches_interface (ip6_main_t * im,
 292                                    ip6_address_t * key,
 293                                    ip_interface_address_t * ia)
 294 {
 295   ip6_address_t * a = ip_interface_address_get_address (&im->lookup_main, ia);
 296   return ip6_destination_matches_route (im, key, a, ia->address_length);
 297 }
 298
 299 /* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
 300 always_inline uword
 301 ip6_unaligned_destination_matches_route (ip6_main_t * im,
 302                                          ip6_address_t * key,
 303                                          ip6_address_t * dest,
 304                                          uword dest_length)
 305 {
 306   int i;
 307   for (i = 0; i < ARRAY_LEN (key->as_uword); i++)
 308     {
 309       if ((clib_mem_unaligned (&key->as_uword[i], uword) ^ dest->as_uword[i]) & im->fib_masks[dest_length].as_uword[i])
 310         return 0;
 311     }
 312   return 1;
 313 }
 314
 315 always_inline int
 316 ip6_src_address_for_packet (ip6_main_t * im, vlib_buffer_t * p, ip6_address_t * src, u32 sw_if_index)
 317 {
 318   ip_lookup_main_t * lm = &im->lookup_main;
 319   ip_interface_address_t * ia = ip_interface_address_for_packet (lm, p, sw_if_index);
 320   if (ia == NULL)
 321     return -1;
 322   ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 323   *src = a[0];
 324   return 0;
 325 }
 326
 327 always_inline u32
 328 ip6_src_lookup_for_packet (ip6_main_t * im, vlib_buffer_t * b, ip6_header_t * i)
 329 {
 330   if (vnet_buffer (b)->ip.adj_index[VLIB_RX] == ~0)
 331     vnet_buffer (b)->ip.adj_index[VLIB_RX]
 332       = ip6_fib_lookup (im, vnet_buffer (b)->sw_if_index[VLIB_RX],
 333                         &i->src_address);
 334   return vnet_buffer (b)->ip.adj_index[VLIB_RX];
 335 }
 336
 337 /* Find interface address which matches destination. */
 338 always_inline ip6_address_t *
 339 ip6_interface_address_matching_destination (ip6_main_t * im, ip6_address_t * dst, u32 sw_if_index,
 340                                             ip_interface_address_t ** result_ia)
 341 {
 342   ip_lookup_main_t * lm = &im->lookup_main;
 343   ip_interface_address_t * ia;
 344   ip6_address_t * result = 0;
 345
 346   foreach_ip_interface_address (lm, ia, sw_if_index,
 347                                 1 /* honor unnumbered */,
 348   ({
 349     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 350     if (ip6_destination_matches_route (im, dst, a, ia->address_length))
 351       {
 352         result = a;
 353         break;
 354       }
 355   }));
 356   if (result_ia)
 357     *result_ia = result ? ia : 0;
 358   return result;
 359 }
 360
 361 clib_error_t *
 362 ip6_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
 363                                ip6_address_t * address, u32 address_length,
 364                                u32 is_del);
 365
 366 int ip6_address_compare (ip6_address_t * a1, ip6_address_t * a2);
 367
 368 /* Add/del a route to the FIB. */
 369
 370 #define IP6_ROUTE_FLAG_ADD (0 << 0)
 371 #define IP6_ROUTE_FLAG_DEL (1 << 0)
 372 #define IP6_ROUTE_FLAG_TABLE_ID  (0 << 1)
 373 #define IP6_ROUTE_FLAG_FIB_INDEX (1 << 1)
 374 #define IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY (1 << 2)
 375 #define IP6_ROUTE_FLAG_NO_REDISTRIBUTE (1 << 3)
 376 #define IP6_ROUTE_FLAG_NOT_LAST_IN_GROUP (1 << 4)
 377 /* Dynamic route created via neighbor discovery. */
 378 #define IP6_ROUTE_FLAG_NEIGHBOR (1 << 5)
 379
 380 typedef struct {
 381   /* IP6_ROUTE_FLAG_* */
 382   u32 flags;
 383
 384   /* Either index of fib or table_id to hash and get fib.
 385      IP6_ROUTE_FLAG_FIB_INDEX specifies index; otherwise table_id is assumed. */
 386   u32 table_index_or_table_id;
 387
 388   /* Destination address (prefix) and length. */
 389   ip6_address_t dst_address;
 390   u32 dst_address_length;
 391
 392   /* Adjacency to use for this destination. */
 393   u32 adj_index;
 394
 395   /* If specified adjacencies to add and then
 396      use for this destination.  add_adj/n_add_adj
 397      are override adj_index if specified. */
 398   ip_adjacency_t * add_adj;
 399   u32 n_add_adj;
 400 } ip6_add_del_route_args_t;
 401
 402 void ip6_add_del_route (ip6_main_t * im, ip6_add_del_route_args_t * args);
 403
 404 void ip6_add_del_route_next_hop (ip6_main_t * im,
 405                                  u32 flags,
 406                                  ip6_address_t * dst_address,
 407                                  u32 dst_address_length,
 408                                  ip6_address_t * next_hop,
 409                                  u32 next_hop_sw_if_index,
 410                                  u32 next_hop_weight, u32 adj_index,
 411                                  u32 explicit_fib_index);
 412
 413 u32
 414 ip6_route_get_next_hop_adj (ip6_main_t * im,
 415                             u32 fib_index,
 416                             ip6_address_t *next_hop,
 417                             u32 next_hop_sw_if_index,
 418                             u32 explicit_fib_index);
 419
 420 u32
 421 ip6_get_route (ip6_main_t * im,
 422                u32 fib_index_or_table_id,
 423                u32 flags,
 424                ip6_address_t * address,
 425                u32 address_length);
 426
 427 void
 428 ip6_foreach_matching_route (ip6_main_t * im,
 429                             u32 table_index_or_table_id,
 430                             u32 flags,
 431                             ip6_address_t * address,
 432                             u32 address_length,
 433                             ip6_address_t ** results,
 434                             u8 ** result_length);
 435
 436 void ip6_delete_matching_routes (ip6_main_t * im,
 437                                  u32 table_index_or_table_id,
 438                                  u32 flags,
 439                                  ip6_address_t * address,
 440                                  u32 address_length);
 441
 442 void ip6_maybe_remap_adjacencies (ip6_main_t * im,
 443                                   u32 table_index_or_table_id,
 444                                   u32 flags);
 445
 446 void ip6_adjacency_set_interface_route (vnet_main_t * vnm,
 447                                         ip_adjacency_t * adj,
 448                                         u32 sw_if_index,
 449                                         u32 if_address_index);
 450
 451 u32
 452 vnet_ip6_neighbor_glean_add(u32 fib_index, void * next_hop_arg);
 453
 454 clib_error_t *
 455 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index);
 456
 457 clib_error_t *
 458 ip6_set_neighbor_limit (u32 neighbor_limit);
 459
 460 uword
 461 ip6_udp_register_listener (vlib_main_t * vm,
 462                            u16 dst_port,
 463                            u32 next_node_index);
 464
 465 u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp);
 466
 467 void ip6_register_protocol (u32 protocol, u32 node_index);
 468
 469 serialize_function_t serialize_vnet_ip6_main, unserialize_vnet_ip6_main;
 470
 471 int
 472 vnet_set_ip6_ethernet_neighbor (vlib_main_t * vm,
 473                                 u32 sw_if_index,
 474                                 ip6_address_t * a,
 475                                 u8 * link_layer_address,
 476                                 uword n_bytes_link_layer_address,
 477                                 int is_static);
 478 int
 479 vnet_unset_ip6_ethernet_neighbor (vlib_main_t * vm,
 480                                   u32 sw_if_index,
 481                                   ip6_address_t * a,
 482                                   u8 * link_layer_address,
 483                                   uword n_bytes_link_layer_address);
 484 void
 485 vnet_ip6_fib_init (ip6_main_t * im, u32 fib_index);
 486
 487 void
 488 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t *ip,
 489                                                   u8 *mac);
 490
 491 void
 492 ip6_ethernet_mac_address_from_link_local_address (u8 *mac,
 493                                                   ip6_address_t *ip);
 494
 495 int vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config);
 496
 497 int
 498 ip6_neighbor_ra_config(vlib_main_t * vm, u32 sw_if_index,
 499                        u8 suppress, u8 managed, u8 other,
 500                        u8 ll_option,  u8 send_unicast,  u8 cease,
 501                        u8 use_lifetime,  u32 lifetime,
 502                        u32 initial_count,  u32 initial_interval,
 503                        u32 max_interval,  u32 min_interval,
 504                        u8 is_no);
 505
 506 int
 507 ip6_neighbor_ra_prefix(vlib_main_t * vm, u32 sw_if_index,
 508                        ip6_address_t *prefix_addr,  u8 prefix_len,
 509                        u8 use_default,  u32 val_lifetime, u32 pref_lifetime,
 510                        u8 no_advertise,  u8 off_link, u8 no_autoconfig, u8 no_onlink,
 511                        u8 is_no);
 512
 513
 514 clib_error_t *
 515 enable_ip6_interface(vlib_main_t * vm,
 516                      u32 sw_if_index);
 517
 518 clib_error_t *
 519 disable_ip6_interface(vlib_main_t * vm,
 520                      u32 sw_if_index);
 521
 522 int
 523 ip6_interface_enabled(vlib_main_t * vm,
 524                       u32 sw_if_index);
 525
 526 clib_error_t *
 527 set_ip6_link_local_address(vlib_main_t * vm,
 528                            u32 sw_if_index,
 529                            ip6_address_t *address,
 530                            u8 address_length);
 531
 532 void vnet_register_ip6_neighbor_resolution_event(vnet_main_t * vnm,
 533                                                  void * address_arg,
 534                                                  uword node_index,
 535                                                  uword type_opaque,
 536                                                  uword data);
 537
 538 int vnet_add_del_ip6_nd_change_event (vnet_main_t * vnm,
 539                                       void * data_callback,
 540                                       u32 pid,
 541                                       void * address_arg,
 542                                       uword node_index,
 543                                       uword type_opaque,
 544                                       uword data,
 545                                       int is_add);
 546
 547 int vnet_ip6_nd_term (vlib_main_t * vm,
 548                       vlib_node_runtime_t * node,
 549                       vlib_buffer_t * p0,
 550                       ethernet_header_t * eth,
 551                       ip6_header_t * ip,
 552                       u32 sw_if_index,
 553                       u16 bd_index,
 554                       u8 shg);
 555
 556 int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
 557                                  u32 table_index);
 558 extern vlib_node_registration_t ip6_lookup_node;
 559
 560 /* Compute flow hash.  We'll use it to select which Sponge to use for this
 561    flow.  And other things. */
 562 always_inline u32
 563 ip6_compute_flow_hash (ip6_header_t * ip, u32 flow_hash_config)
 564 {
 565     tcp_header_t * tcp = (void *) (ip + 1);
 566     u64 a, b, c;
 567     u64 t1, t2;
 568     uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
 569                         || ip->protocol == IP_PROTOCOL_UDP);
 570
 571     t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]);
 572     t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0;
 573
 574     t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]);
 575     t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 0;
 576
 577     a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
 578     b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
 579     b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
 580
 581     t1 = is_tcp_udp ? tcp->ports.src : 0;
 582     t2 = is_tcp_udp ? tcp->ports.dst : 0;
 583
 584     t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
 585     t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
 586
 587     c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
 588         ((t1<<16) | t2) : ((t2<<16) | t1);
 589
 590     hash_mix64 (a, b, c);
 591     return (u32) c;
 592 }
 593
 594 /*
 595  * Hop-by-Hop handling
 596  */
 597 typedef struct {
 598   /* Array of function pointers to HBH option handling routines */
 599   int (*options[256])(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt);
 600   u8 *(*trace[256])(u8 *s, ip6_hop_by_hop_option_t *opt);
 601   uword next_override;
 602 } ip6_hop_by_hop_main_t;
 603
 604 extern ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
 605
 606 int ip6_hbh_register_option (u8 option,
 607                              int options(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt),
 608                              u8 *trace(u8 *s, ip6_hop_by_hop_option_t *opt));
 609 int ip6_hbh_unregister_option (u8 option);
 610 void ip6_hbh_set_next_override (uword next);
 611
 612 /* Flag used by IOAM code. Classifier sets it pop-hop-by-hop checks it */
 613 #define OI_DECAP   100
 614
 615 #endif /* included_ip_ip6_h */