src/plugins/nat/nat.h

   1 /*
   2  * Copyright (c) 2016 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  * @file NAT plugin global declarations
  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 <vnet/fib/fib_source.h>
  27 #include <vppinfra/elog.h>
  28 #include <vppinfra/bihash_8_8.h>
  29 #include <vppinfra/bihash_16_8.h>
  30 #include <vppinfra/dlist.h>
  31 #include <vppinfra/error.h>
  32 #include <vlibapi/api.h>
  33 #include <vlib/log.h>
  34 #include <vppinfra/bihash_16_8.h>
  35
  36 /* default session timeouts */
  37 #define SNAT_UDP_TIMEOUT 300
  38 #define SNAT_TCP_TRANSITORY_TIMEOUT 240
  39 #define SNAT_TCP_ESTABLISHED_TIMEOUT 7440
  40 #define SNAT_ICMP_TIMEOUT 60
  41
  42 /* number of worker handoff frame queue elements */
  43 #define NAT_FQ_NELTS 64
  44
  45 /* NAT buffer flags */
  46 #define SNAT_FLAG_HAIRPINNING (1 << 0)
  47
  48 typedef enum
  49 {
  50   NAT_NEXT_DROP,
  51   NAT_NEXT_ICMP_ERROR,
  52   NAT_NEXT_IN2OUT_PRE,
  53   NAT_NEXT_OUT2IN_PRE,
  54   NAT_NEXT_IN2OUT_ED_FAST_PATH,
  55   NAT_NEXT_IN2OUT_ED_SLOW_PATH,
  56   NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH,
  57   NAT_NEXT_OUT2IN_ED_FAST_PATH,
  58   NAT_NEXT_OUT2IN_ED_SLOW_PATH,
  59   NAT_N_NEXT,
  60 } nat_next_t;
  61
  62 typedef struct
  63 {
  64   u32 next_index;
  65 } nat_pre_trace_t;
  66
  67 /* session key (4-tuple) */
  68 typedef struct
  69 {
  70   union
  71   {
  72     struct
  73     {
  74       ip4_address_t addr;
  75       u16 port;
  76       u16 protocol:3, fib_index:13;
  77     };
  78     u64 as_u64;
  79   };
  80 } snat_session_key_t;
  81
  82 /* deterministic session outside key */
  83 typedef struct
  84 {
  85   union
  86   {
  87     struct
  88     {
  89       ip4_address_t ext_host_addr;
  90       u16 ext_host_port;
  91       u16 out_port;
  92     };
  93     u64 as_u64;
  94   };
  95 } snat_det_out_key_t;
  96
  97 /* user (internal host) key */
  98 typedef struct
  99 {
 100   union
 101   {
 102     struct
 103     {
 104       ip4_address_t addr;
 105       u32 fib_index;
 106     };
 107     u64 as_u64;
 108   };
 109 } snat_user_key_t;
 110
 111 /* NAT API Configuration flags */
 112 #define foreach_nat_config_flag \
 113   _(0x01, IS_TWICE_NAT)         \
 114   _(0x02, IS_SELF_TWICE_NAT)    \
 115   _(0x04, IS_OUT2IN_ONLY)       \
 116   _(0x08, IS_ADDR_ONLY)         \
 117   _(0x10, IS_OUTSIDE)           \
 118   _(0x20, IS_INSIDE)            \
 119   _(0x40, IS_STATIC)            \
 120   _(0x80, IS_EXT_HOST_VALID)    \
 121
 122 typedef enum nat_config_flags_t_
 123 {
 124 #define _(n,f) NAT_API_##f = n,
 125   foreach_nat_config_flag
 126 #undef _
 127 } nat_config_flags_t;
 128
 129 /* External address and port allocation modes */
 130 #define foreach_nat_addr_and_port_alloc_alg \
 131   _(0, DEFAULT, "default")         \
 132   _(1, MAPE, "map-e")              \
 133   _(2, RANGE, "port-range")
 134
 135 typedef enum
 136 {
 137 #define _(v, N, s) NAT_ADDR_AND_PORT_ALLOC_ALG_##N = v,
 138   foreach_nat_addr_and_port_alloc_alg
 139 #undef _
 140 } nat_addr_and_port_alloc_alg_t;
 141
 142
 143 /* Supported L4 protocols */
 144 #define foreach_snat_protocol \
 145   _(UDP, 0, udp, "udp")       \
 146   _(TCP, 1, tcp, "tcp")       \
 147   _(ICMP, 2, icmp, "icmp")
 148
 149 typedef enum
 150 {
 151 #define _(N, i, n, s) SNAT_PROTOCOL_##N = i,
 152   foreach_snat_protocol
 153 #undef _
 154 } snat_protocol_t;
 155
 156
 157 /* Session state */
 158 #define foreach_snat_session_state          \
 159   _(0, UNKNOWN, "unknown")                 \
 160   _(1, UDP_ACTIVE, "udp-active")           \
 161   _(2, TCP_SYN_SENT, "tcp-syn-sent")       \
 162   _(3, TCP_ESTABLISHED, "tcp-established") \
 163   _(4, TCP_FIN_WAIT, "tcp-fin-wait")       \
 164   _(5, TCP_CLOSE_WAIT, "tcp-close-wait")   \
 165   _(6, TCP_CLOSING, "tcp-closing")         \
 166   _(7, TCP_LAST_ACK, "tcp-last-ack")       \
 167   _(8, TCP_CLOSED, "tcp-closed")           \
 168   _(9, ICMP_ACTIVE, "icmp-active")
 169
 170 typedef enum
 171 {
 172 #define _(v, N, s) SNAT_SESSION_##N = v,
 173   foreach_snat_session_state
 174 #undef _
 175 } snat_session_state_t;
 176
 177 #define foreach_nat_in2out_ed_error                     \
 178 _(UNSUPPORTED_PROTOCOL, "unsupported protocol")         \
 179 _(IN2OUT_PACKETS, "good in2out packets processed")      \
 180 _(OUT_OF_PORTS, "out of ports")                         \
 181 _(BAD_ICMP_TYPE, "unsupported ICMP type")               \
 182 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded")   \
 183 _(MAX_USER_SESS_EXCEEDED, "max user sessions exceeded") \
 184 _(DROP_FRAGMENT, "drop fragment")                       \
 185 _(CANNOT_CREATE_USER, "cannot create NAT user")         \
 186 _(NON_SYN, "non-SYN packet try to create session")      \
 187 _(TCP_PACKETS, "TCP packets")                           \
 188 _(TCP_CLOSED, "drops due to TCP in transitory timeout") \
 189 _(UDP_PACKETS, "UDP packets")                           \
 190 _(ICMP_PACKETS, "ICMP packets")                         \
 191 _(OTHER_PACKETS, "other protocol packets")              \
 192 _(FRAGMENTS, "fragments")                               \
 193 _(CACHED_FRAGMENTS, "cached fragments")                 \
 194 _(PROCESSED_FRAGMENTS, "processed fragments")
 195
 196 typedef enum
 197 {
 198 #define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
 199   foreach_nat_in2out_ed_error
 200 #undef _
 201     NAT_IN2OUT_ED_N_ERROR,
 202 } nat_in2out_ed_error_t;
 203
 204 #define foreach_nat_out2in_ed_error                     \
 205 _(UNSUPPORTED_PROTOCOL, "unsupported protocol")         \
 206 _(OUT2IN_PACKETS, "good out2in packets processed")      \
 207 _(OUT_OF_PORTS, "out of ports")                         \
 208 _(BAD_ICMP_TYPE, "unsupported ICMP type")               \
 209 _(NO_TRANSLATION, "no translation")                     \
 210 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded")   \
 211 _(MAX_USER_SESS_EXCEEDED, "max user sessions exceeded") \
 212 _(DROP_FRAGMENT, "drop fragment")                       \
 213 _(CANNOT_CREATE_USER, "cannot create NAT user")         \
 214 _(NON_SYN, "non-SYN packet try to create session")      \
 215 _(TCP_PACKETS, "TCP packets")                           \
 216 _(TCP_CLOSED, "drops due to TCP in transitory timeout") \
 217 _(UDP_PACKETS, "UDP packets")                           \
 218 _(ICMP_PACKETS, "ICMP packets")                         \
 219 _(OTHER_PACKETS, "other protocol packets")              \
 220 _(FRAGMENTS, "fragments")                               \
 221 _(CACHED_FRAGMENTS, "cached fragments")                 \
 222 _(PROCESSED_FRAGMENTS, "processed fragments")
 223
 224 typedef enum
 225 {
 226 #define _(sym,str) NAT_OUT2IN_ED_ERROR_##sym,
 227   foreach_nat_out2in_ed_error
 228 #undef _
 229     NAT_OUT2IN_ED_N_ERROR,
 230 } nat_out2in_ed_error_t;
 231
 232
 233 /* Endpoint dependent TCP session state */
 234 #define NAT44_SES_I2O_FIN 1
 235 #define NAT44_SES_O2I_FIN 2
 236 #define NAT44_SES_I2O_FIN_ACK 4
 237 #define NAT44_SES_O2I_FIN_ACK 8
 238 #define NAT44_SES_I2O_SYN 16
 239 #define NAT44_SES_O2I_SYN 32
 240 #define NAT44_SES_RST     64
 241
 242 /* Session flags */
 243 #define SNAT_SESSION_FLAG_STATIC_MAPPING       1
 244 #define SNAT_SESSION_FLAG_UNKNOWN_PROTO        2
 245 #define SNAT_SESSION_FLAG_LOAD_BALANCING       4
 246 #define SNAT_SESSION_FLAG_TWICE_NAT            8
 247 #define SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT   16
 248 #define SNAT_SESSION_FLAG_FWD_BYPASS           32
 249 #define SNAT_SESSION_FLAG_AFFINITY             64
 250 #define SNAT_SESSION_FLAG_OUTPUT_FEATURE       128
 251
 252 /* NAT interface flags */
 253 #define NAT_INTERFACE_FLAG_IS_INSIDE 1
 254 #define NAT_INTERFACE_FLAG_IS_OUTSIDE 2
 255
 256 /* Static mapping flags */
 257 #define NAT_STATIC_MAPPING_FLAG_ADDR_ONLY    1
 258 #define NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY  2
 259 #define NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT 4
 260 #define NAT_STATIC_MAPPING_FLAG_LB           8
 261
 262 /* *INDENT-OFF* */
 263 typedef CLIB_PACKED(struct
 264 {
 265   /* Outside network key */
 266   snat_session_key_t out2in;
 267
 268   /* Inside network key */
 269   snat_session_key_t in2out;
 270
 271   /* Flags */
 272   u32 flags;
 273
 274   /* Per-user translations */
 275   u32 per_user_index;
 276   u32 per_user_list_head_index;
 277
 278   /* index in global LRU list */
 279   u32 global_lru_index;
 280   f64 last_lru_update;
 281
 282   /* Last heard timer */
 283   f64 last_heard;
 284
 285   /* Last HA refresh */
 286   f64 ha_last_refreshed;
 287
 288   /* Counters */
 289   u64 total_bytes;
 290   u32 total_pkts;
 291
 292   /* External host address and port */
 293   ip4_address_t ext_host_addr;
 294   u16 ext_host_port;
 295
 296   /* External host address and port after translation */
 297   ip4_address_t ext_host_nat_addr;
 298   u16 ext_host_nat_port;
 299
 300   /* TCP session state */
 301   u8 state;
 302   u32 i2o_fin_seq;
 303   u32 o2i_fin_seq;
 304   u32 tcp_close_timestamp;
 305
 306   /* user index */
 307   u32 user_index;
 308 }) snat_session_t;
 309 /* *INDENT-ON* */
 310
 311
 312 typedef struct
 313 {
 314   ip4_address_t addr;
 315   u32 fib_index;
 316   u32 sessions_per_user_list_head_index;
 317   u32 nsessions;
 318   u32 nstaticsessions;
 319 } snat_user_t;
 320
 321 typedef struct
 322 {
 323   ip4_address_t addr;
 324   u32 fib_index;
 325 /* *INDENT-OFF* */
 326 #define _(N, i, n, s) \
 327   u16 busy_##n##_ports; \
 328   u16 * busy_##n##_ports_per_thread; \
 329   u32 busy_##n##_port_refcounts[65535];
 330   foreach_snat_protocol
 331 #undef _
 332 /* *INDENT-ON* */
 333 } snat_address_t;
 334
 335 typedef struct
 336 {
 337   u32 fib_index;
 338   u32 refcount;
 339 } nat_outside_fib_t;
 340
 341 typedef struct
 342 {
 343   /* Inside network port */
 344   u16 in_port;
 345   /* Outside network address and port */
 346   snat_det_out_key_t out;
 347   /* Session state */
 348   u8 state;
 349   /* Expire timeout */
 350   u32 expire;
 351 } snat_det_session_t;
 352
 353 typedef struct
 354 {
 355   /* inside IP address range */
 356   ip4_address_t in_addr;
 357   u8 in_plen;
 358   /* outside IP address range */
 359   ip4_address_t out_addr;
 360   u8 out_plen;
 361   /* inside IP addresses / outside IP addresses */
 362   u32 sharing_ratio;
 363   /* number of ports available to internal host */
 364   u16 ports_per_host;
 365   /* session counter */
 366   u32 ses_num;
 367   /* vector of sessions */
 368   snat_det_session_t *sessions;
 369 } snat_det_map_t;
 370
 371 typedef struct
 372 {
 373   /* backend IP address */
 374   ip4_address_t addr;
 375   /* backend port number */
 376   u16 port;
 377   /* probability of the backend to be randomly matched */
 378   u8 probability;
 379   u8 prefix;
 380   /* backend FIB table */
 381   u32 vrf_id;
 382   u32 fib_index;
 383 } nat44_lb_addr_port_t;
 384
 385 typedef enum
 386 {
 387   /* twice-nat disabled */
 388   TWICE_NAT_DISABLED,
 389   /* twice-nat enabled */
 390   TWICE_NAT,
 391   /* twice-nat only when src IP equals dst IP after translation */
 392   TWICE_NAT_SELF,
 393 } twice_nat_type_t;
 394
 395 typedef enum
 396 {
 397   /* no load-balancing */
 398   NO_LB_NAT,
 399   /* load-balancing */
 400   LB_NAT,
 401   /* load-balancing with affinity */
 402   AFFINITY_LB_NAT,
 403 } lb_nat_type_t;
 404
 405 typedef struct
 406 {
 407   /* local IP address */
 408   ip4_address_t local_addr;
 409   /* external IP address */
 410   ip4_address_t external_addr;
 411   /* local port */
 412   u16 local_port;
 413   /* external port */
 414   u16 external_port;
 415   /* is twice-nat */
 416   twice_nat_type_t twice_nat;
 417   /* local FIB table */
 418   u32 vrf_id;
 419   u32 fib_index;
 420   /* protocol */
 421   snat_protocol_t proto;
 422   /* 0 = disabled, otherwise client IP affinity sticky time in seconds */
 423   u32 affinity;
 424   /* worker threads used by backends/local host */
 425   u32 *workers;
 426   /* opaque string tag */
 427   u8 *tag;
 428   /* backends for load-balancing mode */
 429   nat44_lb_addr_port_t *locals;
 430   /* affinity per service lis */
 431   u32 affinity_per_service_list_head_index;
 432   /* flags */
 433   u32 flags;
 434 } snat_static_mapping_t;
 435
 436 typedef struct
 437 {
 438   u32 sw_if_index;
 439   u8 flags;
 440 } snat_interface_t;
 441
 442 typedef struct
 443 {
 444   ip4_address_t l_addr;
 445   u16 l_port;
 446   u16 e_port;
 447   u32 sw_if_index;
 448   u32 vrf_id;
 449   snat_protocol_t proto;
 450   u32 flags;
 451   int addr_only;
 452   int twice_nat;
 453   int is_add;
 454   int out2in_only;
 455   int identity_nat;
 456   u8 *tag;
 457 } snat_static_map_resolve_t;
 458
 459 typedef struct
 460 {
 461   /* Main lookup tables */
 462   clib_bihash_8_8_t out2in;
 463   clib_bihash_8_8_t in2out;
 464
 465   /* Endpoint dependent sessions lookup tables */
 466   clib_bihash_16_8_t out2in_ed;
 467   clib_bihash_16_8_t in2out_ed;
 468
 469   /* Find-a-user => src address lookup */
 470   clib_bihash_8_8_t user_hash;
 471
 472   /* User pool */
 473   snat_user_t *users;
 474
 475   /* Session pool */
 476   snat_session_t *sessions;
 477
 478   /* Pool of doubly-linked list elements */
 479   dlist_elt_t *list_pool;
 480
 481   /* LRU session list - head is stale, tail is fresh */
 482   dlist_elt_t *global_lru_pool;
 483   u32 global_lru_head_index;
 484
 485   /* NAT thread index */
 486   u32 snat_thread_index;
 487
 488   /* real thread index */
 489   u32 thread_index;
 490
 491 } snat_main_per_thread_data_t;
 492
 493 struct snat_main_s;
 494
 495 /* ICMP session match function */
 496 typedef u32 (snat_icmp_match_function_t) (struct snat_main_s * sm,
 497                                           vlib_node_runtime_t * node,
 498                                           u32 thread_index,
 499                                           vlib_buffer_t * b0,
 500                                           ip4_header_t * ip0, u8 * p_proto,
 501                                           snat_session_key_t * p_value,
 502                                           u8 * p_dont_translate, void *d,
 503                                           void *e);
 504
 505 /* Return worker thread index for given packet */
 506 typedef u32 (snat_get_worker_in2out_function_t) (ip4_header_t * ip,
 507                                                  u32 rx_fib_index,
 508                                                  u8 is_output);
 509
 510 typedef u32 (snat_get_worker_out2in_function_t) (vlib_buffer_t * b,
 511                                                  ip4_header_t * ip,
 512                                                  u32 rx_fib_index,
 513                                                  u8 is_output);
 514
 515 /* NAT address and port allacotaion function */
 516 typedef int (nat_alloc_out_addr_and_port_function_t) (snat_address_t *
 517                                                       addresses,
 518                                                       u32 fib_index,
 519                                                       u32 thread_index,
 520                                                       snat_session_key_t * k,
 521                                                       u16 port_per_thread,
 522                                                       u32 snat_thread_index);
 523
 524
 525 typedef struct snat_main_s
 526 {
 527   /* ICMP session match functions */
 528   snat_icmp_match_function_t *icmp_match_in2out_cb;
 529   snat_icmp_match_function_t *icmp_match_out2in_cb;
 530
 531   /* Thread settings */
 532   u32 num_workers;
 533   u32 first_worker_index;
 534   u32 *workers;
 535   snat_get_worker_in2out_function_t *worker_in2out_cb;
 536   snat_get_worker_out2in_function_t *worker_out2in_cb;
 537   u16 port_per_thread;
 538   u32 num_snat_thread;
 539
 540   /* Per thread data */
 541   snat_main_per_thread_data_t *per_thread_data;
 542
 543   /* Find a static mapping by local */
 544   clib_bihash_8_8_t static_mapping_by_local;
 545
 546   /* Find a static mapping by external */
 547   clib_bihash_8_8_t static_mapping_by_external;
 548
 549   /* Static mapping pool */
 550   snat_static_mapping_t *static_mappings;
 551
 552   /* Interface pool */
 553   snat_interface_t *interfaces;
 554   snat_interface_t *output_feature_interfaces;
 555
 556   /* Vector of outside addresses */
 557   snat_address_t *addresses;
 558   /* Address and port allocation function */
 559   nat_alloc_out_addr_and_port_function_t *alloc_addr_and_port;
 560   /* Address and port allocation type */
 561   nat_addr_and_port_alloc_alg_t addr_and_port_alloc_alg;
 562   /* Port set parameters (MAP-E) */
 563   u8 psid_offset;
 564   u8 psid_length;
 565   u16 psid;
 566   /* Port range parameters */
 567   u16 start_port;
 568   u16 end_port;
 569
 570   /* vector of outside fibs */
 571   nat_outside_fib_t *outside_fibs;
 572
 573   /* Vector of twice NAT addresses for extenal hosts */
 574   snat_address_t *twice_nat_addresses;
 575
 576   /* sw_if_indices whose intfc addresses should be auto-added */
 577   u32 *auto_add_sw_if_indices;
 578   u32 *auto_add_sw_if_indices_twice_nat;
 579
 580   /* vector of interface address static mappings to resolve. */
 581   snat_static_map_resolve_t *to_resolve;
 582
 583   /* Randomize port allocation order */
 584   u32 random_seed;
 585
 586   /* Worker handoff frame-queue index */
 587   u32 fq_in2out_index;
 588   u32 fq_in2out_output_index;
 589   u32 fq_out2in_index;
 590
 591   /* node indexes */
 592   u32 error_node_index;
 593
 594   /* handoff fq nodes  */
 595   u32 handoff_out2in_index;
 596   u32 handoff_in2out_index;
 597   u32 handoff_in2out_output_index;
 598
 599   /* respect feature arc nodes */
 600   u32 pre_out2in_node_index;
 601   u32 pre_in2out_node_index;
 602
 603   u32 in2out_node_index;
 604   u32 in2out_output_node_index;
 605   u32 in2out_fast_node_index;
 606   u32 in2out_slowpath_node_index;
 607   u32 in2out_slowpath_output_node_index;
 608   u32 ed_in2out_node_index;
 609   u32 ed_in2out_slowpath_node_index;
 610   u32 out2in_node_index;
 611   u32 out2in_fast_node_index;
 612   u32 ed_out2in_node_index;
 613   u32 ed_out2in_slowpath_node_index;
 614   u32 det_in2out_node_index;
 615   u32 det_out2in_node_index;
 616
 617   u32 hairpinning_node_index;
 618   u32 hairpin_dst_node_index;
 619   u32 hairpin_src_node_index;
 620   u32 ed_hairpinning_node_index;
 621   u32 ed_hairpin_dst_node_index;
 622   u32 ed_hairpin_src_node_index;
 623
 624
 625   /* Deterministic NAT mappings */
 626   snat_det_map_t *det_maps;
 627
 628   /* If forwarding is enabled */
 629   u8 forwarding_enabled;
 630
 631   /* Config parameters */
 632   u8 static_mapping_only;
 633   u8 static_mapping_connection_tracking;
 634   u8 deterministic;
 635   u8 out2in_dpo;
 636   u8 endpoint_dependent;
 637
 638   u32 translation_buckets;
 639   uword translation_memory_size;
 640   u32 max_translations;
 641   u32 *max_translations_per_fib;
 642
 643   u32 user_buckets;
 644   uword user_memory_size;
 645   u32 max_translations_per_user;
 646
 647   u32 outside_vrf_id;
 648   u32 outside_fib_index;
 649   u32 inside_vrf_id;
 650   u32 inside_fib_index;
 651
 652   /* values of various timeouts */
 653   // proto timeouts
 654   u32 udp_timeout;
 655   u32 tcp_transitory_timeout;
 656   u32 tcp_established_timeout;
 657   u32 icmp_timeout;
 658
 659   /* TCP MSS clamping */
 660   u16 mss_clamping;
 661   u16 mss_value_net;
 662
 663   /* counters/gauges */
 664   vlib_simple_counter_main_t total_users;
 665   vlib_simple_counter_main_t total_sessions;
 666
 667   /* API message ID base */
 668   u16 msg_id_base;
 669
 670   /* log class */
 671   vlib_log_class_t log_class;
 672   /* logging level */
 673   u8 log_level;
 674
 675   /* convenience */
 676   vlib_main_t *vlib_main;
 677   vnet_main_t *vnet_main;
 678   ip4_main_t *ip4_main;
 679   ip_lookup_main_t *ip4_lookup_main;
 680   api_main_t *api_main;
 681 } snat_main_t;
 682
 683 typedef struct
 684 {
 685   u32 thread_index;
 686   f64 now;
 687 } nat44_is_idle_session_ctx_t;
 688
 689 typedef struct
 690 {
 691   u32 cached_sw_if_index;
 692   u32 cached_ip4_address;
 693 } snat_runtime_t;
 694
 695 extern snat_main_t snat_main;
 696
 697 // nat pre ed next_node feature classification
 698 extern vlib_node_registration_t nat_default_node;
 699 extern vlib_node_registration_t nat_pre_in2out_node;
 700 extern vlib_node_registration_t nat_pre_out2in_node;
 701
 702 extern vlib_node_registration_t snat_in2out_node;
 703 extern vlib_node_registration_t snat_in2out_output_node;
 704 extern vlib_node_registration_t snat_out2in_node;
 705 extern vlib_node_registration_t snat_in2out_worker_handoff_node;
 706 extern vlib_node_registration_t snat_in2out_output_worker_handoff_node;
 707 extern vlib_node_registration_t snat_out2in_worker_handoff_node;
 708 extern vlib_node_registration_t snat_det_in2out_node;
 709 extern vlib_node_registration_t snat_det_out2in_node;
 710 extern vlib_node_registration_t nat44_ed_in2out_node;
 711 extern vlib_node_registration_t nat44_ed_in2out_output_node;
 712 extern vlib_node_registration_t nat44_ed_out2in_node;
 713
 714 extern fib_source_t nat_fib_src_hi;
 715 extern fib_source_t nat_fib_src_low;
 716
 717 /* format functions */
 718 format_function_t format_snat_user;
 719 format_function_t format_snat_user_v2;
 720 format_function_t format_snat_static_mapping;
 721 format_function_t format_snat_static_map_to_resolve;
 722 format_function_t format_snat_session;
 723 format_function_t format_det_map_ses;
 724 format_function_t format_snat_key;
 725 format_function_t format_static_mapping_key;
 726 format_function_t format_snat_protocol;
 727 format_function_t format_nat_addr_and_port_alloc_alg;
 728 /* unformat functions */
 729 unformat_function_t unformat_snat_protocol;
 730
 731 /** \brief Check if SNAT session is created from static mapping.
 732     @param s SNAT session
 733     @return 1 if SNAT session is created from static mapping otherwise 0
 734 */
 735 #define snat_is_session_static(s) (s->flags & SNAT_SESSION_FLAG_STATIC_MAPPING)
 736
 737 /** \brief Check if SNAT session for unknown protocol.
 738     @param s SNAT session
 739     @return 1 if SNAT session for unknown protocol otherwise 0
 740 */
 741 #define snat_is_unk_proto_session(s) (s->flags & SNAT_SESSION_FLAG_UNKNOWN_PROTO)
 742
 743 /** \brief Check if NAT session is twice NAT.
 744     @param s NAT session
 745     @return 1 if NAT session is twice NAT
 746 */
 747 #define is_twice_nat_session(s) (s->flags & SNAT_SESSION_FLAG_TWICE_NAT)
 748
 749 /** \brief Check if NAT session is load-balancing.
 750     @param s NAT session
 751     @return 1 if NAT session is load-balancing
 752 */
 753 #define is_lb_session(s) (s->flags & SNAT_SESSION_FLAG_LOAD_BALANCING)
 754
 755 /** \brief Check if NAT session is forwarding bypass.
 756     @param s NAT session
 757     @return 1 if NAT session is load-balancing
 758 */
 759 #define is_fwd_bypass_session(s) (s->flags & SNAT_SESSION_FLAG_FWD_BYPASS)
 760
 761 /** \brief Check if NAT session is endpoint dependent.
 762     @param s NAT session
 763     @return 1 if NAT session is endpoint dependent
 764 */
 765 #define is_ed_session(s) (s->flags & SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT)
 766
 767 /** \brief Check if NAT session has affinity record.
 768     @param s NAT session
 769     @return 1 if NAT session has affinity record
 770 */
 771 #define is_affinity_sessions(s) (s->flags & SNAT_SESSION_FLAG_AFFINITY)
 772
 773 /** \brief Check if NAT interface is inside.
 774     @param i NAT interfce
 775     @return 1 if inside interface
 776 */
 777 #define nat_interface_is_inside(i) i->flags & NAT_INTERFACE_FLAG_IS_INSIDE
 778
 779 /** \brief Check if NAT interface is outside.
 780     @param i NAT interfce
 781     @return 1 if outside interface
 782 */
 783 #define nat_interface_is_outside(i) i->flags & NAT_INTERFACE_FLAG_IS_OUTSIDE
 784
 785 /** \brief Check if NAT44 endpoint-dependent TCP session is closed.
 786     @param s NAT session
 787     @return 1 if session is closed
 788 */
 789 #define nat44_is_ses_closed(s) s->state == 0xf
 790
 791 /** \brief Check if NAT static mapping is address only (1:1NAT).
 792     @param sm NAT static mapping
 793     @return 1 if 1:1NAT, 0 if 1:1NAPT
 794 */
 795 #define is_addr_only_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_ADDR_ONLY)
 796
 797 /** \brief Check if NAT static mapping match only out2in direction.
 798     @param sm NAT static mapping
 799     @return 1 if rule match only out2in direction
 800 */
 801 #define is_out2in_only_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY)
 802
 803 /** \brief Check if NAT static mapping is identity NAT.
 804     @param sm NAT static mapping
 805     @return 1 if identity NAT
 806 */
 807 #define is_identity_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT)
 808
 809 /** \brief Check if NAT static mapping is load-balancing.
 810     @param sm NAT static mapping
 811     @return 1 if load-balancing
 812 */
 813 #define is_lb_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_LB)
 814
 815 /** \brief Check if client initiating TCP connection (received SYN from client)
 816     @param t TCP header
 817     @return 1 if client initiating TCP connection
 818 */
 819 always_inline bool
 820 tcp_flags_is_init (u8 f)
 821 {
 822   return (f & TCP_FLAG_SYN) && !(f & TCP_FLAG_ACK);
 823 }
 824
 825 /* logging */
 826 #define nat_log_err(...) \
 827   vlib_log(VLIB_LOG_LEVEL_ERR, snat_main.log_class, __VA_ARGS__)
 828 #define nat_log_warn(...) \
 829   vlib_log(VLIB_LOG_LEVEL_WARNING, snat_main.log_class, __VA_ARGS__)
 830 #define nat_log_notice(...) \
 831   vlib_log(VLIB_LOG_LEVEL_NOTICE, snat_main.log_class, __VA_ARGS__)
 832 #define nat_log_info(...) \
 833   vlib_log(VLIB_LOG_LEVEL_INFO, snat_main.log_class, __VA_ARGS__)
 834 #define nat_log_debug(...)\
 835   vlib_log(VLIB_LOG_LEVEL_DEBUG, snat_main.log_class, __VA_ARGS__)
 836
 837 /* NAT API Logging Levels */
 838 #define foreach_nat_log_level \
 839   _(0x00, LOG_NONE)           \
 840   _(0x01, LOG_ERROR)          \
 841   _(0x02, LOG_WARNING)        \
 842   _(0x03, LOG_NOTICE)         \
 843   _(0x04, LOG_INFO)           \
 844   _(0x05, LOG_DEBUG)
 845
 846 typedef enum nat_log_level_t_
 847 {
 848 #define _(n,f) SNAT_##f = n,
 849   foreach_nat_log_level
 850 #undef _
 851 } nat_log_level_t;
 852
 853 #define nat_elog(_level, _str)                    \
 854 do                                                \
 855   {                                               \
 856     snat_main_t *sm = &snat_main;                 \
 857     if (PREDICT_FALSE (sm->log_level >= _level))  \
 858       {                                           \
 859         ELOG_TYPE_DECLARE (e) =                   \
 860           {                                       \
 861             .format = "nat-msg " _str,            \
 862             .format_args = "",                    \
 863           };                                      \
 864         ELOG_DATA (&sm->vlib_main->elog_main, e); \
 865       }                                           \
 866   } while (0);
 867
 868 #define nat_elog_addr(_level, _str, _addr)               \
 869 do                                                       \
 870   {                                                      \
 871     if (PREDICT_FALSE (sm->log_level >= _level))         \
 872       {                                                  \
 873         ELOG_TYPE_DECLARE (e) =                          \
 874           {                                              \
 875             .format = "nat-msg " _str " %d.%d.%d.%d",    \
 876             .format_args = "i1i1i1i1",                   \
 877           };                                             \
 878         CLIB_PACKED(struct                               \
 879           {                                              \
 880             u8 oct1;                                     \
 881             u8 oct2;                                     \
 882             u8 oct3;                                     \
 883             u8 oct4;                                     \
 884           }) *ed;                                        \
 885         ed = ELOG_DATA (&vlib_global_main.elog_main, e); \
 886         ed->oct4 = _addr >> 24;                          \
 887         ed->oct3 = _addr >> 16;                          \
 888         ed->oct2 = _addr >> 8;                           \
 889         ed->oct1 = _addr;                                \
 890     }                                                    \
 891   } while (0);
 892
 893 #define nat_elog_debug_handoff(_str, _tid, _fib, _src, _dst)                \
 894 do                                                                          \
 895   {                                                                         \
 896   if (PREDICT_FALSE (sm->log_level >= SNAT_LOG_DEBUG))                      \
 897     {                                                                       \
 898       ELOG_TYPE_DECLARE (e) =                                               \
 899         {                                                                   \
 900           .format = "nat-msg " _str " ip src: %d.%d.%d.%d dst: %d.%d.%d.%d" \
 901                                     " tid from: %d to: %d fib: %d",         \
 902         .format_args = "i1i1i1i1i1i1i1i1i4i4i4",                            \
 903       };                                                                    \
 904       CLIB_PACKED(struct                                                    \
 905         {                                                                   \
 906           u8 src_oct1;                                                      \
 907           u8 src_oct2;                                                      \
 908           u8 src_oct3;                                                      \
 909           u8 src_oct4;                                                      \
 910           u8 dst_oct1;                                                      \
 911           u8 dst_oct2;                                                      \
 912           u8 dst_oct3;                                                      \
 913           u8 dst_oct4;                                                      \
 914           u32 ftid;                                                         \
 915           u32 ttid;                                                         \
 916           u32 fib;                                                          \
 917         }) *ed;                                                             \
 918       ed = ELOG_DATA (&vlib_global_main.elog_main, e);                      \
 919       ed->src_oct1 = _src >> 24;                                            \
 920       ed->src_oct2 = _src >> 16;                                            \
 921       ed->src_oct3 = _src >> 8;                                             \
 922       ed->src_oct4 = _src;                                                  \
 923       ed->dst_oct1 = _dst >> 24;                                            \
 924       ed->dst_oct2 = _dst >> 16;                                            \
 925       ed->dst_oct3 = _dst >> 8;                                             \
 926       ed->dst_oct4 = _dst;                                                  \
 927       ed->ftid = vlib_get_thread_index ();                                  \
 928       ed->ttid = _tid;                                                      \
 929       ed->fib = _fib;                                                       \
 930     }                                                                       \
 931   } while (0);
 932
 933 #define nat_elog_debug_handoff_v2(_str, _prt, _fib, _src, _dst)              \
 934 do                                                                           \
 935   {                                                                          \
 936   if (PREDICT_FALSE (sm->log_level >= SNAT_LOG_DEBUG))                       \
 937     {                                                                        \
 938       ELOG_TYPE_DECLARE (e) =                                                \
 939         {                                                                    \
 940           .format = "nat-msg " _str " ip_src:%d.%d.%d.%d ip_dst:%d.%d.%d.%d" \
 941                                     " tid:%d prt:%d fib:%d",                 \
 942         .format_args = "i1i1i1i1i1i1i1i1i4i4i4",                             \
 943       };                                                                     \
 944       CLIB_PACKED(struct                                                     \
 945         {                                                                    \
 946           u8 src_oct1;                                                       \
 947           u8 src_oct2;                                                       \
 948           u8 src_oct3;                                                       \
 949           u8 src_oct4;                                                       \
 950           u8 dst_oct1;                                                       \
 951           u8 dst_oct2;                                                       \
 952           u8 dst_oct3;                                                       \
 953           u8 dst_oct4;                                                       \
 954           u32 tid;                                                           \
 955           u32 prt;                                                           \
 956           u32 fib;                                                           \
 957         }) *ed;                                                              \
 958       ed = ELOG_DATA (&vlib_global_main.elog_main, e);                       \
 959       ed->src_oct1 = _src >> 24;                                             \
 960       ed->src_oct2 = _src >> 16;                                             \
 961       ed->src_oct3 = _src >> 8;                                              \
 962       ed->src_oct4 = _src;                                                   \
 963       ed->dst_oct1 = _dst >> 24;                                             \
 964       ed->dst_oct2 = _dst >> 16;                                             \
 965       ed->dst_oct3 = _dst >> 8;                                              \
 966       ed->dst_oct4 = _dst;                                                   \
 967       ed->tid = vlib_get_thread_index ();                                    \
 968       ed->prt = _prt;                                                        \
 969       ed->fib = _fib;                                                        \
 970     }                                                                        \
 971   } while (0);
 972
 973 #define nat_elog_X1(_level, _fmt, _arg, _val1)         \
 974 do                                                     \
 975   {                                                    \
 976     snat_main_t *sm = &snat_main;                      \
 977     if (PREDICT_FALSE (sm->log_level >= _level))       \
 978       {                                                \
 979         ELOG_TYPE_DECLARE (e) =                        \
 980           {                                            \
 981             .format = "nat-msg " _fmt,                 \
 982             .format_args = _arg,                       \
 983           };                                           \
 984         CLIB_PACKED(struct                             \
 985           {                                            \
 986             typeof (_val1) val1;                       \
 987           }) *ed;                                      \
 988         ed = ELOG_DATA (&sm->vlib_main->elog_main, e); \
 989         ed->val1 = _val1;                              \
 990       }                                                \
 991   } while (0);
 992
 993 #define nat_elog_notice(nat_elog_str) \
 994   nat_elog(SNAT_LOG_INFO, "[notice] " nat_elog_str)
 995 #define nat_elog_warn(nat_elog_str) \
 996   nat_elog(SNAT_LOG_WARNING, "[warning] " nat_elog_str)
 997 #define nat_elog_err(nat_elog_str) \
 998   nat_elog(SNAT_LOG_ERROR, "[error] " nat_elog_str)
 999 #define nat_elog_debug(nat_elog_str) \
1000   nat_elog(SNAT_LOG_DEBUG, "[debug] " nat_elog_str)
1001 #define nat_elog_info(nat_elog_str) \
1002   nat_elog(SNAT_LOG_INFO, "[info] " nat_elog_str)
1003
1004 #define nat_elog_notice_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1005   nat_elog_X1(SNAT_LOG_NOTICE, "[notice] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1006 #define nat_elog_warn_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1007   nat_elog_X1(SNAT_LOG_WARNING, "[warning] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1008 #define nat_elog_err_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1009   nat_elog_X1(SNAT_LOG_ERROR, "[error] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1010 #define nat_elog_debug_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1011   nat_elog_X1(SNAT_LOG_DEBUG, "[debug] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1012 #define nat_elog_info_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1013   nat_elog_X1(SNAT_LOG_INFO, "[info] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1014
1015 /* ICMP session match functions */
1016 u32 icmp_match_in2out_fast (snat_main_t * sm, vlib_node_runtime_t * node,
1017                             u32 thread_index, vlib_buffer_t * b0,
1018                             ip4_header_t * ip0, u8 * p_proto,
1019                             snat_session_key_t * p_value,
1020                             u8 * p_dont_translate, void *d, void *e);
1021 u32 icmp_match_in2out_slow (snat_main_t * sm, vlib_node_runtime_t * node,
1022                             u32 thread_index, vlib_buffer_t * b0,
1023                             ip4_header_t * ip0, u8 * p_proto,
1024                             snat_session_key_t * p_value,
1025                             u8 * p_dont_translate, void *d, void *e);
1026 u32 icmp_match_out2in_fast (snat_main_t * sm, vlib_node_runtime_t * node,
1027                             u32 thread_index, vlib_buffer_t * b0,
1028                             ip4_header_t * ip0, u8 * p_proto,
1029                             snat_session_key_t * p_value,
1030                             u8 * p_dont_translate, void *d, void *e);
1031 u32 icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node,
1032                             u32 thread_index, vlib_buffer_t * b0,
1033                             ip4_header_t * ip0, u8 * p_proto,
1034                             snat_session_key_t * p_value,
1035                             u8 * p_dont_translate, void *d, void *e);
1036
1037 /* ICMP deterministic NAT session match functions */
1038 u32 icmp_match_out2in_det (snat_main_t * sm, vlib_node_runtime_t * node,
1039                            u32 thread_index, vlib_buffer_t * b0,
1040                            ip4_header_t * ip0, u8 * p_proto,
1041                            snat_session_key_t * p_value,
1042                            u8 * p_dont_translate, void *d, void *e);
1043 u32 icmp_match_in2out_det (snat_main_t * sm, vlib_node_runtime_t * node,
1044                            u32 thread_index, vlib_buffer_t * b0,
1045                            ip4_header_t * ip0, u8 * p_proto,
1046                            snat_session_key_t * p_value,
1047                            u8 * p_dont_translate, void *d, void *e);
1048
1049 /* ICMP endpoint-dependent session match functions */
1050 u32 icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node,
1051                           u32 thread_index, vlib_buffer_t * b0,
1052                           ip4_header_t * ip0, u8 * p_proto,
1053                           snat_session_key_t * p_value,
1054                           u8 * p_dont_translate, void *d, void *e);
1055 u32 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
1056                           u32 thread_index, vlib_buffer_t * b0,
1057                           ip4_header_t * ip0, u8 * p_proto,
1058                           snat_session_key_t * p_value,
1059                           u8 * p_dont_translate, void *d, void *e);
1060
1061 u32 icmp_in2out (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0,
1062                  icmp46_header_t * icmp0, u32 sw_if_index0, u32 rx_fib_index0,
1063                  vlib_node_runtime_t * node, u32 next0, u32 thread_index,
1064                  void *d, void *e);
1065
1066 u32 icmp_out2in (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0,
1067                  icmp46_header_t * icmp0, u32 sw_if_index0, u32 rx_fib_index0,
1068                  vlib_node_runtime_t * node, u32 next0, u32 thread_index,
1069                  void *d, void *e);
1070
1071 /* hairpinning functions */
1072 u32 snat_icmp_hairpinning (snat_main_t * sm, vlib_buffer_t * b0,
1073                            ip4_header_t * ip0, icmp46_header_t * icmp0,
1074                            int is_ed);
1075 void nat_hairpinning_sm_unknown_proto (snat_main_t * sm, vlib_buffer_t * b,
1076                                        ip4_header_t * ip);
1077 void nat44_ed_hairpinning_unknown_proto (snat_main_t * sm, vlib_buffer_t * b,
1078                                          ip4_header_t * ip);
1079 int snat_hairpinning (snat_main_t * sm, vlib_buffer_t * b0,
1080                       ip4_header_t * ip0, udp_header_t * udp0,
1081                       tcp_header_t * tcp0, u32 proto0, int is_ed);
1082
1083 /* Call back functions for clib_bihash_add_or_overwrite_stale */
1084 int nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg);
1085 int nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg);
1086 int nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg);
1087 int nat44_o2i_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg);
1088
1089 /**
1090  * @brief Add external address to NAT44 pool
1091  *
1092  * @param addr      IPv4 address
1093  * @param vrf_id    VRF id of tenant, ~0 means independent of VRF
1094  * @param twice_nat 1 if twice NAT address
1095  *
1096  * @return 0 on success, non-zero value otherwise
1097  */
1098 int snat_add_address (snat_main_t * sm, ip4_address_t * addr, u32 vrf_id,
1099                       u8 twice_nat);
1100
1101 /**
1102  * @brief Delete external address from NAT44 pool
1103  *
1104  * @param addr      IPv4 address
1105  * @param delete_sm 1 if delete static mapping using address
1106  * @param twice_nat 1 if twice NAT address
1107  *
1108  * @return 0 on success, non-zero value otherwise
1109  */
1110 int snat_del_address (snat_main_t * sm, ip4_address_t addr, u8 delete_sm,
1111                       u8 twice_nat);
1112
1113 /**
1114  * @brief Add/delete external address to FIB DPO (out2in DPO mode)
1115  *
1116  * @param addr   IPv4 address
1117  * @param is_add 1 = add, 0 = delete
1118  *
1119  * @return 0 on success, non-zero value otherwise
1120  */
1121 void nat44_add_del_address_dpo (ip4_address_t addr, u8 is_add);
1122
1123 /**
1124  * @brief Add/delete NAT44 static mapping
1125  *
1126  * @param l_addr       local IPv4 address
1127  * @param e_addr       external IPv4 address
1128  * @param l_port       local port number
1129  * @param e_port       external port number
1130  * @param vrf_id       local VRF ID
1131  * @param addr_only    1 = 1:1NAT, 0 = 1:1NAPT
1132  * @param sw_if_index  use interface address as external IPv4 address
1133  * @param proto        L4 protocol
1134  * @param is_add       1 = add, 0 = delete
1135  * @param twice_nat    twice-nat mode
1136  * @param out2in_only  if 1 rule match only out2in direction
1137  * @param tag          opaque string tag
1138  * @param identity_nat identity NAT
1139  *
1140  * @return 0 on success, non-zero value otherwise
1141  */
1142 int snat_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
1143                              u16 l_port, u16 e_port, u32 vrf_id,
1144                              int addr_only, u32 sw_if_index,
1145                              snat_protocol_t proto, int is_add,
1146                              twice_nat_type_t twice_nat, u8 out2in_only,
1147                              u8 * tag, u8 identity_nat);
1148
1149 /**
1150  * @brief Add/delete static mapping with load-balancing (multiple backends)
1151  *
1152  * @param e_addr      external IPv4 address
1153  * @param e_port      external port number
1154  * @param proto       L4 protocol
1155  * @param locals      list of local backends
1156  * @param is_add      1 = add, 0 = delete
1157  * @param twice_nat   twice-nat mode
1158  * @param out2in_only if 1 rule match only out2in direction
1159  * @param tag         opaque string tag
1160  * @param affinity    0 = disabled, otherwise client IP affinity sticky time
1161  *
1162  * @return 0 on success, non-zero value otherwise
1163  */
1164 int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
1165                                      snat_protocol_t proto,
1166                                      nat44_lb_addr_port_t * locals, u8 is_add,
1167                                      twice_nat_type_t twice_nat,
1168                                      u8 out2in_only, u8 * tag, u32 affinity);
1169
1170 int nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port,
1171                                            ip4_address_t l_addr, u16 l_port,
1172                                            snat_protocol_t proto, u32 vrf_id,
1173                                            u8 probability, u8 is_add);
1174
1175 clib_error_t *snat_api_init (vlib_main_t * vm, snat_main_t * sm);
1176
1177 /**
1178  * @brief Set NAT plugin workers
1179  *
1180  * @param bitmap NAT workers bitmap
1181  *
1182  * @return 0 on success, non-zero value otherwise
1183  */
1184 int snat_set_workers (uword * bitmap);
1185
1186 /**
1187  * @brief Enable/disable NAT44 feature on the interface
1188  *
1189  * @param sw_if_index software index of the interface
1190  * @param is_inside   1 = inside, 0 = outside
1191  * @param is_del      1 = delete, 0 = add
1192  *
1193  * @return 0 on success, non-zero value otherwise
1194  */
1195 int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del);
1196
1197 /**
1198  * @brief Enable/disable NAT44 output feature on the interface (postrouting NAT)
1199  *
1200  * @param sw_if_index software index of the interface
1201  * @param is_inside   1 = inside, 0 = outside
1202  * @param is_del      1 = delete, 0 = add
1203  *
1204  * @return 0 on success, non-zero value otherwise
1205  */
1206 int snat_interface_add_del_output_feature (u32 sw_if_index, u8 is_inside,
1207                                            int is_del);
1208
1209 /**
1210  * @brief Add/delete NAT44 pool address from specific interfce
1211  *
1212  * @param sw_if_index software index of the interface
1213  * @param is_del      1 = delete, 0 = add
1214  * @param twice_nat   1 = twice NAT address for extenal hosts
1215  *
1216  * @return 0 on success, non-zero value otherwise
1217  */
1218 int snat_add_interface_address (snat_main_t * sm, u32 sw_if_index, int is_del,
1219                                 u8 twice_nat);
1220
1221 /**
1222  * @brief Delete NAT44 session
1223  *
1224  * @param addr   IPv4 address
1225  * @param port   L4 port number
1226  * @param proto  L4 protocol
1227  * @param vrf_id VRF ID
1228  * @param is_in  1 = inside network address and port pair, 0 = outside
1229  *
1230  * @return 0 on success, non-zero value otherwise
1231  */
1232 int nat44_del_session (snat_main_t * sm, ip4_address_t * addr, u16 port,
1233                        snat_protocol_t proto, u32 vrf_id, int is_in);
1234
1235 /**
1236  * @brief Delete NAT44 endpoint-dependent session
1237  *
1238  * @param addr   IPv4 address
1239  * @param port   L4 port number
1240  * @param proto  L4 protocol
1241  * @param vrf_id VRF ID
1242  * @param is_in  1 = inside network address and port pair, 0 = outside
1243  *
1244  * @return 0 on success, non-zero value otherwise
1245  */
1246 int nat44_del_ed_session (snat_main_t * sm, ip4_address_t * addr, u16 port,
1247                           ip4_address_t * eh_addr, u16 eh_port, u8 proto,
1248                           u32 vrf_id, int is_in);
1249
1250 /**
1251  * @brief Free NAT44 session data (lookup keys, external addrres port)
1252  *
1253  * @param s            NAT session
1254  * @param thread_index thread index
1255  * @param is_ha        is HA event
1256  */
1257 void nat_free_session_data (snat_main_t * sm, snat_session_t * s,
1258                             u32 thread_index, u8 is_ha);
1259
1260 /**
1261  * @brief Set NAT44 session limit (session limit, vrf id)
1262  *
1263  * @param session_limit Session limit
1264  * @param vrf_id        VRF id
1265  * @return 0 on success, non-zero value otherwise
1266  */
1267 int nat44_set_session_limit (u32 session_limit, u32 vrf_id);
1268
1269 /**
1270  * @brief Free NAT44 ED session data (lookup keys, external addrres port)
1271  *
1272  * @param s            NAT session
1273  * @param thread_index thread index
1274  * @param is_ha        is HA event
1275  */
1276 void
1277 nat44_free_session_data (snat_main_t * sm, snat_session_t * s,
1278                          u32 thread_index, u8 is_ha);
1279 /**
1280  * @brief Find or create NAT user
1281  *
1282  * @param addr         IPv4 address
1283  * @param fib_index    FIB table index
1284  * @param thread_index thread index
1285  *
1286  * @return NAT user data structure on success otherwise zero value
1287  */
1288 snat_user_t *nat_user_get_or_create (snat_main_t * sm,
1289                                      ip4_address_t * addr, u32 fib_index,
1290                                      u32 thread_index);
1291
1292 /**
1293  * @brief Allocate new NAT session or recycle last used
1294  *
1295  * @param u            NAT user
1296  * @param thread_index thread index
1297  *
1298  * @return session data structure on success otherwise zero value
1299  */
1300 snat_session_t *nat_session_alloc_or_recycle (snat_main_t * sm,
1301                                               snat_user_t * u,
1302                                               u32 thread_index, f64 now);
1303
1304 /**
1305  * @brief Allocate NAT endpoint-dependent session
1306  *
1307  * @param thread_index thread index
1308  *
1309  * @return session data structure on success otherwise zero value
1310  */
1311 snat_session_t *nat_ed_session_alloc (snat_main_t * sm, u32 thread_index,
1312                                       f64 now);
1313
1314 /**
1315  * @brief Set address and port assignment algorithm for MAP-E CE
1316  *
1317  * @param psid        Port Set Identifier value
1318  * @param psid_offset number of offset bits
1319  * @param psid_length length of PSID
1320  */
1321 void nat_set_alloc_addr_and_port_mape (u16 psid, u16 psid_offset,
1322                                        u16 psid_length);
1323
1324 /**
1325  * @brief Set address and port assignment algorithm for port range
1326  *
1327  * @param start_port beginning of the port range
1328  * @param end_port   end of the port range
1329  */
1330 void nat_set_alloc_addr_and_port_range (u16 start_port, u16 end_port);
1331
1332 /**
1333  * @brief Set address and port assignment algorithm to default/standard
1334  */
1335 void nat_set_alloc_addr_and_port_default (void);
1336
1337 /**
1338  * @brief Free outside address and port pair
1339  *
1340  * @param addresses    vector of outside addresses
1341  * @param thread_index thread index
1342  * @param k            address, port and protocol
1343  */
1344 void snat_free_outside_address_and_port (snat_address_t * addresses,
1345                                          u32 thread_index,
1346                                          snat_session_key_t * k);
1347
1348 /**
1349  * @brief Alloc outside address and port
1350  *
1351  * @param addresses         vector of outside addresses
1352  * @param fib_index         FIB table index
1353  * @param thread_index      thread index
1354  * @param k                 allocated address and port pair
1355  * @param port_per_thread   number of ports per threead
1356  * @param snat_thread_index NAT thread index
1357  *
1358  * @return 0 on success, non-zero value otherwise
1359  */
1360 int snat_alloc_outside_address_and_port (snat_address_t * addresses,
1361                                          u32 fib_index,
1362                                          u32 thread_index,
1363                                          snat_session_key_t * k,
1364                                          u16 port_per_thread,
1365                                          u32 snat_thread_index);
1366
1367 /**
1368  * @brief Match NAT44 static mapping.
1369  *
1370  * @param match         address and port to match
1371  * @param mapping       external/local address and port of the matched mapping
1372  * @param by_external   if 0 match by local address otherwise match by external
1373  *                      address
1374  * @param is_addr_only  1 if matched mapping is address only
1375  * @param twice_nat     matched mapping is twice NAT type
1376  * @param lb            1 if matched mapping is load-balanced
1377  * @param ext_host_addr external host address
1378  *
1379  * @returns 0 if match found otherwise 1.
1380  */
1381 int snat_static_mapping_match (snat_main_t * sm,
1382                                snat_session_key_t match,
1383                                snat_session_key_t * mapping,
1384                                u8 by_external,
1385                                u8 * is_addr_only,
1386                                twice_nat_type_t * twice_nat,
1387                                lb_nat_type_t * lb,
1388                                ip4_address_t * ext_host_addr,
1389                                u8 * is_identity_nat);
1390
1391 /**
1392  * @brief Add/del NAT address to FIB.
1393  *
1394  * Add the external NAT address to the FIB as receive entries. This ensures
1395  * that VPP will reply to ARP for this address and we don't need to enable
1396  * proxy ARP on the outside interface.
1397  *
1398  * @param addr        IPv4 address
1399  * @param plen        address prefix length
1400  * @param sw_if_index software index of the outside interface
1401  * @param is_add      0 = delete, 1 = add.
1402  */
1403 void snat_add_del_addr_to_fib (ip4_address_t * addr,
1404                                u8 p_len, u32 sw_if_index, int is_add);
1405
1406 /*
1407  * Why is this here? Because we don't need to touch this layer to
1408  * simply reply to an icmp. We need to change id to a unique
1409  * value to NAT an echo request/reply.
1410  */
1411
1412 typedef struct
1413 {
1414   u16 identifier;
1415   u16 sequence;
1416 } icmp_echo_header_t;
1417
1418 typedef struct
1419 {
1420   u16 src_port, dst_port;
1421 } tcp_udp_header_t;
1422
1423 int nat_global_lru_free_one (snat_main_t * sm, int thread_index, f64 now);
1424
1425 #endif /* __included_nat_h__ */
1426 /*
1427  * fd.io coding-style-patch-verification: ON
1428  *
1429  * Local Variables:
1430  * eval: (c-set-style "gnu")
1431  * End:
1432  */