src/plugins/nat/nat.h

   1
   2 /*
   3  * nat.h - NAT plugin definitions
   4  *
   5  * Copyright (c) 2016 Cisco and/or its affiliates.
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at:
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18 #ifndef __included_nat_h__
  19 #define __included_nat_h__
  20
  21 #include <vnet/vnet.h>
  22 #include <vnet/ip/ip.h>
  23 #include <vnet/ethernet/ethernet.h>
  24 #include <vnet/ip/icmp46_packet.h>
  25 #include <vnet/api_errno.h>
  26 #include <vppinfra/bihash_8_8.h>
  27 #include <vppinfra/bihash_16_8.h>
  28 #include <vppinfra/dlist.h>
  29 #include <vppinfra/error.h>
  30 #include <vlibapi/api.h>
  31 #include <vlib/log.h>
  32
  33
  34 #define SNAT_UDP_TIMEOUT 300
  35 #define SNAT_TCP_TRANSITORY_TIMEOUT 240
  36 #define SNAT_TCP_ESTABLISHED_TIMEOUT 7440
  37 #define SNAT_ICMP_TIMEOUT 60
  38
  39 #define NAT_FQ_NELTS 64
  40
  41 #define SNAT_FLAG_HAIRPINNING (1 << 0)
  42
  43 /* Key */
  44 typedef struct {
  45   union
  46   {
  47     struct
  48     {
  49       ip4_address_t addr;
  50       u16 port;
  51       u16 protocol:3,
  52         fib_index:13;
  53     };
  54     u64 as_u64;
  55   };
  56 } snat_session_key_t;
  57
  58 typedef struct {
  59   union
  60   {
  61     struct
  62     {
  63       ip4_address_t l_addr;
  64       ip4_address_t r_addr;
  65       u32 proto:8,
  66           fib_index:24;
  67       u16 l_port;
  68       u16 r_port;
  69     };
  70     u64 as_u64[2];
  71   };
  72 } nat_ed_ses_key_t;
  73
  74 typedef struct {
  75   union
  76   {
  77     struct
  78     {
  79       ip4_address_t ext_host_addr;
  80       u16 ext_host_port;
  81       u16 out_port;
  82     };
  83     u64 as_u64;
  84   };
  85 } snat_det_out_key_t;
  86
  87 typedef struct {
  88   union
  89   {
  90     struct
  91     {
  92       ip4_address_t addr;
  93       u32 fib_index;
  94     };
  95     u64 as_u64;
  96   };
  97 } snat_user_key_t;
  98
  99 #define foreach_nat_addr_and_port_alloc_alg \
 100   _(0, DEFAULT, "default")         \
 101   _(1, MAPE, "map-e")              \
 102   _(2, RANGE, "port-range")
 103
 104 typedef enum {
 105 #define _(v, N, s) NAT_ADDR_AND_PORT_ALLOC_ALG_##N = v,
 106   foreach_nat_addr_and_port_alloc_alg
 107 #undef _
 108 } nat_addr_and_port_alloc_alg_t;
 109
 110 #define foreach_snat_protocol \
 111   _(UDP, 0, udp, "udp")       \
 112   _(TCP, 1, tcp, "tcp")       \
 113   _(ICMP, 2, icmp, "icmp")
 114
 115 typedef enum {
 116 #define _(N, i, n, s) SNAT_PROTOCOL_##N = i,
 117   foreach_snat_protocol
 118 #undef _
 119 } snat_protocol_t;
 120
 121
 122 #define foreach_snat_session_state          \
 123   _(0, UNKNOWN, "unknown")                 \
 124   _(1, UDP_ACTIVE, "udp-active")           \
 125   _(2, TCP_SYN_SENT, "tcp-syn-sent")       \
 126   _(3, TCP_ESTABLISHED, "tcp-established") \
 127   _(4, TCP_FIN_WAIT, "tcp-fin-wait")       \
 128   _(5, TCP_CLOSE_WAIT, "tcp-close-wait")   \
 129   _(6, TCP_CLOSING, "tcp-closing")         \
 130   _(7, TCP_LAST_ACK, "tcp-last-ack")       \
 131   _(8, TCP_CLOSED, "tcp-closed")           \
 132   _(9, ICMP_ACTIVE, "icmp-active")
 133
 134 typedef enum {
 135 #define _(v, N, s) SNAT_SESSION_##N = v,
 136   foreach_snat_session_state
 137 #undef _
 138 } snat_session_state_t;
 139
 140 #define NAT44_SES_I2O_FIN 1
 141 #define NAT44_SES_O2I_FIN 2
 142 #define NAT44_SES_I2O_FIN_ACK 4
 143 #define NAT44_SES_O2I_FIN_ACK 8
 144 #define NAT44_SES_I2O_SYN 16
 145 #define NAT44_SES_O2I_SYN 32
 146
 147 #define nat44_is_ses_closed(s) s->state == 0xf
 148
 149 #define SNAT_SESSION_FLAG_STATIC_MAPPING       1
 150 #define SNAT_SESSION_FLAG_UNKNOWN_PROTO        2
 151 #define SNAT_SESSION_FLAG_LOAD_BALANCING       4
 152 #define SNAT_SESSION_FLAG_TWICE_NAT            8
 153 #define SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT   16
 154 #define SNAT_SESSION_FLAG_FWD_BYPASS           32
 155 #define SNAT_SESSION_FLAG_AFFINITY             64
 156
 157 #define NAT_INTERFACE_FLAG_IS_INSIDE 1
 158 #define NAT_INTERFACE_FLAG_IS_OUTSIDE 2
 159
 160 typedef CLIB_PACKED(struct {
 161   snat_session_key_t out2in;    /* 0-15 */
 162
 163   snat_session_key_t in2out;    /* 16-31 */
 164
 165   u32 flags;                    /* 32-35 */
 166
 167   /* per-user translations */
 168   u32 per_user_index;           /* 36-39 */
 169
 170   u32 per_user_list_head_index; /* 40-43 */
 171
 172   /* Last heard timer */
 173   f64 last_heard;               /* 44-51 */
 174
 175   u64 total_bytes;              /* 52-59 */
 176
 177   u32 total_pkts;               /* 60-63 */
 178
 179   /* Outside address */
 180   u32 outside_address_index;    /* 64-67 */
 181
 182   /* External host address and port */
 183   ip4_address_t ext_host_addr;  /* 68-71 */
 184   u16 ext_host_port;            /* 72-73 */
 185
 186   /* External host address and port after translation */
 187   ip4_address_t ext_host_nat_addr; /* 74-77 */
 188   u16 ext_host_nat_port;           /* 78-79 */
 189
 190   /* TCP session state */
 191   u8 state;
 192   u32 i2o_fin_seq;
 193   u32 o2i_fin_seq;
 194 }) snat_session_t;
 195
 196
 197 typedef struct {
 198   ip4_address_t addr;
 199   u32 fib_index;
 200   u32 sessions_per_user_list_head_index;
 201   u32 nsessions;
 202   u32 nstaticsessions;
 203 } snat_user_t;
 204
 205 typedef struct {
 206   ip4_address_t addr;
 207   u32 fib_index;
 208 #define _(N, i, n, s) \
 209   u16 busy_##n##_ports; \
 210   u16 * busy_##n##_ports_per_thread; \
 211   uword * busy_##n##_port_bitmap;
 212   foreach_snat_protocol
 213 #undef _
 214 } snat_address_t;
 215
 216 typedef struct {
 217   u32 fib_index;
 218   u32 refcount;
 219 } nat_outside_fib_t;
 220
 221 typedef struct {
 222   u16 in_port;
 223   snat_det_out_key_t out;
 224   u8 state;
 225   u32 expire;
 226 } snat_det_session_t;
 227
 228 typedef struct {
 229   ip4_address_t in_addr;
 230   u8 in_plen;
 231   ip4_address_t out_addr;
 232   u8 out_plen;
 233   u32 sharing_ratio;
 234   u16 ports_per_host;
 235   u32 ses_num;
 236   /* vector of sessions */
 237   snat_det_session_t * sessions;
 238 } snat_det_map_t;
 239
 240 typedef struct {
 241   ip4_address_t addr;
 242   u16 port;
 243   u8 probability;
 244   u8 prefix;
 245   u32 vrf_id;
 246   u32 fib_index;
 247 } nat44_lb_addr_port_t;
 248
 249 typedef enum {
 250   TWICE_NAT_DISABLED,
 251   TWICE_NAT,
 252   TWICE_NAT_SELF,
 253 } twice_nat_type_t;
 254
 255 typedef enum {
 256   NO_LB_NAT,
 257   LB_NAT,
 258   AFFINITY_LB_NAT,
 259 } lb_nat_type_t;
 260
 261 typedef struct {
 262   ip4_address_t local_addr;
 263   ip4_address_t external_addr;
 264   u16 local_port;
 265   u16 external_port;
 266   u8 addr_only;
 267   twice_nat_type_t twice_nat;
 268   u8 out2in_only;
 269   u32 vrf_id;
 270   u32 fib_index;
 271   snat_protocol_t proto;
 272   u32 affinity;
 273   u32 *workers;
 274   u8 *tag;
 275   nat44_lb_addr_port_t *locals;
 276   u32 affinity_per_service_list_head_index;
 277 } snat_static_mapping_t;
 278
 279 typedef struct {
 280   u32 sw_if_index;
 281   u8 flags;
 282 } snat_interface_t;
 283
 284 typedef struct {
 285   ip4_address_t l_addr;
 286   u16 l_port;
 287   u16 e_port;
 288   u32 sw_if_index;
 289   u32 vrf_id;
 290   snat_protocol_t proto;
 291   int addr_only;
 292   int twice_nat;
 293   int is_add;
 294   u8 *tag;
 295 } snat_static_map_resolve_t;
 296
 297 typedef struct {
 298   /* Main lookup tables */
 299   clib_bihash_8_8_t out2in;
 300   clib_bihash_8_8_t in2out;
 301
 302   /* Endpoint dependent sessions lookup tables */
 303   clib_bihash_16_8_t out2in_ed;
 304   clib_bihash_16_8_t in2out_ed;
 305
 306   /* Find-a-user => src address lookup */
 307   clib_bihash_8_8_t user_hash;
 308
 309   /* User pool */
 310   snat_user_t * users;
 311
 312   /* Session pool */
 313   snat_session_t * sessions;
 314
 315   /* Pool of doubly-linked list elements */
 316   dlist_elt_t * list_pool;
 317
 318   u32 snat_thread_index;
 319 } snat_main_per_thread_data_t;
 320
 321 struct snat_main_s;
 322
 323 typedef u32 snat_icmp_match_function_t (struct snat_main_s *sm,
 324                                         vlib_node_runtime_t *node,
 325                                         u32 thread_index,
 326                                         vlib_buffer_t *b0,
 327                                         ip4_header_t *ip0,
 328                                         u8 *p_proto,
 329                                         snat_session_key_t *p_value,
 330                                         u8 *p_dont_translate,
 331                                         void *d,
 332                                         void *e);
 333
 334 typedef u32 (snat_get_worker_function_t) (ip4_header_t * ip, u32 rx_fib_index);
 335
 336 typedef int nat_alloc_out_addr_and_port_function_t (snat_address_t * addresses,
 337                                                     u32 fib_index,
 338                                                     u32 thread_index,
 339                                                     snat_session_key_t * k,
 340                                                     u32 * address_indexp,
 341                                                     u16 port_per_thread,
 342                                                     u32 snat_thread_index);
 343
 344 typedef struct snat_main_s {
 345   snat_icmp_match_function_t * icmp_match_in2out_cb;
 346   snat_icmp_match_function_t * icmp_match_out2in_cb;
 347
 348   u32 num_workers;
 349   u32 first_worker_index;
 350   u32 * workers;
 351   snat_get_worker_function_t * worker_in2out_cb;
 352   snat_get_worker_function_t * worker_out2in_cb;
 353   u16 port_per_thread;
 354   u32 num_snat_thread;
 355
 356   /* Per thread data */
 357   snat_main_per_thread_data_t * per_thread_data;
 358
 359   /* Find a static mapping by local */
 360   clib_bihash_8_8_t static_mapping_by_local;
 361
 362   /* Find a static mapping by external */
 363   clib_bihash_8_8_t static_mapping_by_external;
 364
 365   /* Static mapping pool */
 366   snat_static_mapping_t * static_mappings;
 367
 368   /* Interface pool */
 369   snat_interface_t * interfaces;
 370   snat_interface_t * output_feature_interfaces;
 371
 372   /* Vector of outside addresses */
 373   snat_address_t * addresses;
 374   /* Address and port allocation function */
 375   nat_alloc_out_addr_and_port_function_t *alloc_addr_and_port;
 376   /* Address and port allocation type */
 377   nat_addr_and_port_alloc_alg_t addr_and_port_alloc_alg;
 378   /* Port set parameters (MAP-E) */
 379   u8 psid_offset;
 380   u8 psid_length;
 381   u16 psid;
 382   /* Port range parameters */
 383   u16 start_port;
 384   u16 end_port;
 385
 386   /* vector of outside fibs */
 387   nat_outside_fib_t * outside_fibs;
 388
 389   /* Vector of twice NAT addresses for extenal hosts */
 390   snat_address_t * twice_nat_addresses;
 391
 392   /* sw_if_indices whose intfc addresses should be auto-added */
 393   u32 * auto_add_sw_if_indices;
 394   u32 * auto_add_sw_if_indices_twice_nat;
 395
 396   /* vector of interface address static mappings to resolve. */
 397   snat_static_map_resolve_t *to_resolve;
 398
 399   /* Randomize port allocation order */
 400   u32 random_seed;
 401
 402   /* Worker handoff index */
 403   u32 fq_in2out_index;
 404   u32 fq_in2out_output_index;
 405   u32 fq_out2in_index;
 406
 407   /* in2out and out2in node index */
 408   u32 in2out_node_index;
 409   u32 in2out_output_node_index;
 410   u32 out2in_node_index;
 411   u32 error_node_index;
 412
 413   /* Deterministic NAT */
 414   snat_det_map_t * det_maps;
 415
 416   /* If forwarding is enabled */
 417   u8 forwarding_enabled;
 418
 419   /* Config parameters */
 420   u8 static_mapping_only;
 421   u8 static_mapping_connection_tracking;
 422   u8 deterministic;
 423   u8 out2in_dpo;
 424   u8 endpoint_dependent;
 425   u32 translation_buckets;
 426   u32 translation_memory_size;
 427   u32 max_translations;
 428   u32 user_buckets;
 429   u32 user_memory_size;
 430   u32 max_translations_per_user;
 431   u32 outside_vrf_id;
 432   u32 outside_fib_index;
 433   u32 inside_vrf_id;
 434   u32 inside_fib_index;
 435
 436   /* values of various timeouts */
 437   u32 udp_timeout;
 438   u32 tcp_established_timeout;
 439   u32 tcp_transitory_timeout;
 440   u32 icmp_timeout;
 441
 442   /* TCP MSS clamping */
 443   u16 mss_clamping;
 444   u16 mss_value_net;
 445
 446   /* API message ID base */
 447   u16 msg_id_base;
 448
 449   /* log class */
 450   vlib_log_class_t log_class;
 451
 452   /* convenience */
 453   vlib_main_t * vlib_main;
 454   vnet_main_t * vnet_main;
 455   ip4_main_t * ip4_main;
 456   ip_lookup_main_t * ip4_lookup_main;
 457   api_main_t * api_main;
 458 } snat_main_t;
 459
 460 typedef struct {
 461   u32 thread_index;
 462   f64 now;
 463 } nat44_is_idle_session_ctx_t;
 464
 465 extern snat_main_t snat_main;
 466 extern vlib_node_registration_t snat_in2out_node;
 467 extern vlib_node_registration_t snat_in2out_output_node;
 468 extern vlib_node_registration_t snat_out2in_node;
 469 extern vlib_node_registration_t snat_in2out_fast_node;
 470 extern vlib_node_registration_t snat_out2in_fast_node;
 471 extern vlib_node_registration_t snat_in2out_worker_handoff_node;
 472 extern vlib_node_registration_t snat_in2out_output_worker_handoff_node;
 473 extern vlib_node_registration_t snat_out2in_worker_handoff_node;
 474 extern vlib_node_registration_t snat_det_in2out_node;
 475 extern vlib_node_registration_t snat_det_out2in_node;
 476 extern vlib_node_registration_t snat_hairpin_dst_node;
 477 extern vlib_node_registration_t snat_hairpin_src_node;
 478 extern vlib_node_registration_t nat44_ed_in2out_node;
 479 extern vlib_node_registration_t nat44_ed_in2out_output_node;
 480 extern vlib_node_registration_t nat44_ed_out2in_node;
 481 extern vlib_node_registration_t nat44_ed_hairpin_dst_node;
 482 extern vlib_node_registration_t nat44_ed_hairpin_src_node;
 483 extern vlib_node_registration_t nat44_ed_in2out_worker_handoff_node;
 484 extern vlib_node_registration_t nat44_ed_in2out_output_worker_handoff_node;
 485 extern vlib_node_registration_t nat44_ed_out2in_worker_handoff_node;
 486
 487 void snat_free_outside_address_and_port (snat_address_t * addresses,
 488                                          u32 thread_index,
 489                                          snat_session_key_t * k);
 490
 491 int snat_alloc_outside_address_and_port (snat_address_t * addresses,
 492                                          u32 fib_index,
 493                                          u32 thread_index,
 494                                          snat_session_key_t * k,
 495                                          u32 * address_indexp,
 496                                          u16 port_per_thread,
 497                                          u32 snat_thread_index);
 498
 499 int snat_static_mapping_match (snat_main_t * sm,
 500                                snat_session_key_t match,
 501                                snat_session_key_t * mapping,
 502                                u8 by_external,
 503                                u8 *is_addr_only,
 504                                twice_nat_type_t *twice_nat,
 505                                lb_nat_type_t *lb,
 506                                ip4_address_t * ext_host_addr);
 507
 508 void snat_add_del_addr_to_fib (ip4_address_t * addr,
 509                                u8 p_len,
 510                                u32 sw_if_index,
 511                                int is_add);
 512
 513 format_function_t format_snat_user;
 514 format_function_t format_snat_static_mapping;
 515 format_function_t format_snat_static_map_to_resolve;
 516 format_function_t format_snat_session;
 517 format_function_t format_det_map_ses;
 518
 519 typedef struct {
 520   u32 cached_sw_if_index;
 521   u32 cached_ip4_address;
 522 } snat_runtime_t;
 523
 524 /** \brief Check if SNAT session is created from static mapping.
 525     @param s SNAT session
 526     @return 1 if SNAT session is created from static mapping otherwise 0
 527 */
 528 #define snat_is_session_static(s) (s->flags & SNAT_SESSION_FLAG_STATIC_MAPPING)
 529
 530 /** \brief Check if SNAT session for unknown protocol.
 531     @param s SNAT session
 532     @return 1 if SNAT session for unknown protocol otherwise 0
 533 */
 534 #define snat_is_unk_proto_session(s) (s->flags & SNAT_SESSION_FLAG_UNKNOWN_PROTO)
 535
 536 /** \brief Check if NAT session is twice NAT.
 537     @param s NAT session
 538     @return 1 if NAT session is twice NAT
 539 */
 540 #define is_twice_nat_session(s) (s->flags & SNAT_SESSION_FLAG_TWICE_NAT)
 541
 542 /** \brief Check if NAT session is load-balancing.
 543     @param s NAT session
 544     @return 1 if NAT session is load-balancing
 545 */
 546 #define is_lb_session(s) (s->flags & SNAT_SESSION_FLAG_LOAD_BALANCING)
 547
 548 /** \brief Check if NAT session is forwarding bypass.
 549     @param s NAT session
 550     @return 1 if NAT session is load-balancing
 551 */
 552 #define is_fwd_bypass_session(s) (s->flags & SNAT_SESSION_FLAG_FWD_BYPASS)
 553
 554 /** \brief Check if NAT session is endpoint dependent.
 555     @param s NAT session
 556     @return 1 if NAT session is endpoint dependent
 557 */
 558 #define is_ed_session(s) (s->flags & SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT)
 559
 560 /** \brief Check if NAT session has affinity record.
 561     @param s NAT session
 562     @return 1 if NAT session has affinity record
 563 */
 564 #define is_affinity_sessions(s) (s->flags & SNAT_SESSION_FLAG_AFFINITY)
 565
 566 #define nat_interface_is_inside(i) i->flags & NAT_INTERFACE_FLAG_IS_INSIDE
 567 #define nat_interface_is_outside(i) i->flags & NAT_INTERFACE_FLAG_IS_OUTSIDE
 568
 569 #define nat_log_err(...) \
 570   vlib_log(VLIB_LOG_LEVEL_ERR, snat_main.log_class, __VA_ARGS__)
 571 #define nat_log_warn(...) \
 572   vlib_log(VLIB_LOG_LEVEL_WARNING, snat_main.log_class, __VA_ARGS__)
 573 #define nat_log_notice(...) \
 574   vlib_log(VLIB_LOG_LEVEL_NOTICE, snat_main.log_class, __VA_ARGS__)
 575 #define nat_log_info(...) \
 576   vlib_log(VLIB_LOG_LEVEL_INFO, snat_main.log_class, __VA_ARGS__)
 577 #define nat_log_debug(...)\
 578   vlib_log(VLIB_LOG_LEVEL_DEBUG, snat_main.log_class, __VA_ARGS__)
 579
 580 /*
 581  * Why is this here? Because we don't need to touch this layer to
 582  * simply reply to an icmp. We need to change id to a unique
 583  * value to NAT an echo request/reply.
 584  */
 585
 586 typedef struct {
 587   u16 identifier;
 588   u16 sequence;
 589 } icmp_echo_header_t;
 590
 591 typedef struct {
 592   u16 src_port, dst_port;
 593 } tcp_udp_header_t;
 594
 595 u32 icmp_match_in2out_fast(snat_main_t *sm, vlib_node_runtime_t *node,
 596                            u32 thread_index, vlib_buffer_t *b0,
 597                            ip4_header_t *ip0, u8 *p_proto,
 598                            snat_session_key_t *p_value,
 599                            u8 *p_dont_translate, void *d, void *e);
 600 u32 icmp_match_in2out_slow(snat_main_t *sm, vlib_node_runtime_t *node,
 601                            u32 thread_index, vlib_buffer_t *b0,
 602                            ip4_header_t *ip0, u8 *p_proto,
 603                            snat_session_key_t *p_value,
 604                            u8 *p_dont_translate, void *d, void *e);
 605 u32 icmp_match_in2out_det(snat_main_t *sm, vlib_node_runtime_t *node,
 606                           u32 thread_index, vlib_buffer_t *b0,
 607                           ip4_header_t *ip0, u8 *p_proto,
 608                           snat_session_key_t *p_value,
 609                           u8 *p_dont_translate, void *d, void *e);
 610 u32 icmp_match_in2out_ed(snat_main_t *sm, vlib_node_runtime_t *node,
 611                          u32 thread_index, vlib_buffer_t *b0,
 612                          ip4_header_t *ip0, u8 *p_proto,
 613                          snat_session_key_t *p_value,
 614                          u8 *p_dont_translate, void *d, void *e);
 615 u32 icmp_match_out2in_fast(snat_main_t *sm, vlib_node_runtime_t *node,
 616                            u32 thread_index, vlib_buffer_t *b0,
 617                            ip4_header_t *ip0, u8 *p_proto,
 618                            snat_session_key_t *p_value,
 619                            u8 *p_dont_translate, void *d, void *e);
 620 u32 icmp_match_out2in_slow(snat_main_t *sm, vlib_node_runtime_t *node,
 621                            u32 thread_index, vlib_buffer_t *b0,
 622                            ip4_header_t *ip0, u8 *p_proto,
 623                            snat_session_key_t *p_value,
 624                            u8 *p_dont_translate, void *d, void *e);
 625 u32 icmp_match_out2in_det(snat_main_t *sm, vlib_node_runtime_t *node,
 626                           u32 thread_index, vlib_buffer_t *b0,
 627                           ip4_header_t *ip0, u8 *p_proto,
 628                           snat_session_key_t *p_value,
 629                           u8 *p_dont_translate, void *d, void *e);
 630 u32 icmp_match_out2in_ed(snat_main_t *sm, vlib_node_runtime_t *node,
 631                          u32 thread_index, vlib_buffer_t *b0,
 632                          ip4_header_t *ip0, u8 *p_proto,
 633                          snat_session_key_t *p_value,
 634                          u8 *p_dont_translate, void *d, void *e);
 635 void increment_v4_address(ip4_address_t * a);
 636 int snat_add_address(snat_main_t *sm, ip4_address_t *addr, u32 vrf_id,
 637                      u8 twice_nat);
 638 int snat_del_address(snat_main_t *sm, ip4_address_t addr, u8 delete_sm,
 639                      u8 twice_nat);
 640 void nat44_add_del_address_dpo (ip4_address_t addr, u8 is_add);
 641 int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
 642                             u16 l_port, u16 e_port, u32 vrf_id, int addr_only,
 643                             u32 sw_if_index, snat_protocol_t proto, int is_add,
 644                             twice_nat_type_t twice_nat, u8 out2in_only,
 645                             u8 *tag);
 646 clib_error_t * snat_api_init(vlib_main_t * vm, snat_main_t * sm);
 647 int snat_set_workers (uword * bitmap);
 648 int snat_interface_add_del(u32 sw_if_index, u8 is_inside, int is_del);
 649 int snat_interface_add_del_output_feature(u32 sw_if_index, u8 is_inside,
 650                                           int is_del);
 651 int snat_add_interface_address(snat_main_t *sm, u32 sw_if_index, int is_del,
 652                                u8 twice_nat);
 653 uword unformat_snat_protocol(unformat_input_t * input, va_list * args);
 654 u8 * format_snat_protocol(u8 * s, va_list * args);
 655 u8 * format_nat_addr_and_port_alloc_alg(u8 * s, va_list * args);
 656 int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
 657                                      snat_protocol_t proto,
 658                                      nat44_lb_addr_port_t *locals, u8 is_add,
 659                                      twice_nat_type_t twice_nat, u8 out2in_only,
 660                                      u8 *tag, u32 affinity);
 661 int nat44_del_session (snat_main_t *sm, ip4_address_t *addr, u16 port,
 662                        snat_protocol_t proto, u32 vrf_id, int is_in);
 663 int nat44_del_ed_session (snat_main_t *sm, ip4_address_t *addr, u16 port,
 664                           ip4_address_t *eh_addr, u16 eh_port, u8 proto,
 665                           u32 vrf_id, int is_in);
 666 void nat_free_session_data (snat_main_t * sm, snat_session_t * s,
 667                             u32 thread_index);
 668 snat_user_t * nat_user_get_or_create (snat_main_t *sm, ip4_address_t *addr,
 669                                       u32 fib_index, u32 thread_index);
 670 snat_session_t * nat_session_alloc_or_recycle (snat_main_t *sm, snat_user_t *u,
 671                                                u32 thread_index);
 672 snat_session_t * nat_ed_session_alloc (snat_main_t *sm, snat_user_t *u,
 673                                        u32 thread_index);
 674 void nat_set_alloc_addr_and_port_mape (u16 psid, u16 psid_offset,
 675                                        u16 psid_length);
 676 void nat_set_alloc_addr_and_port_range (u16 start_port, u16 end_port);
 677 void nat_set_alloc_addr_and_port_default (void);
 678 int nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t *kv, void *arg);
 679 int nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t *kv, void *arg);
 680 int nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t *kv, void *arg);
 681 int nat44_o2i_is_idle_session_cb (clib_bihash_kv_8_8_t *kv, void *arg);
 682
 683 #endif /* __included_snat_h__ */