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.c
  17  * NAT plugin global declarations
  18  */
  19 #ifndef __included_nat_h__
  20 #define __included_nat_h__
  21
  22 #include <vnet/vnet.h>
  23 #include <vnet/ip/ip.h>
  24 #include <vnet/ethernet/ethernet.h>
  25 #include <vnet/ip/icmp46_packet.h>
  26 #include <vnet/api_errno.h>
  27 #include <vnet/fib/fib_source.h>
  28 #include <vppinfra/elog.h>
  29 #include <vppinfra/bihash_8_8.h>
  30 #include <vppinfra/bihash_16_8.h>
  31 #include <vppinfra/dlist.h>
  32 #include <vppinfra/error.h>
  33 #include <vlibapi/api.h>
  34 #include <vlib/log.h>
  35 #include <vppinfra/bihash_16_8.h>
  36
  37 /* default session timeouts */
  38 #define SNAT_UDP_TIMEOUT 300
  39 #define SNAT_TCP_TRANSITORY_TIMEOUT 240
  40 #define SNAT_TCP_ESTABLISHED_TIMEOUT 7440
  41 #define SNAT_ICMP_TIMEOUT 60
  42
  43 /* number of worker handoff frame queue elements */
  44 #define NAT_FQ_NELTS 64
  45
  46 /* NAT buffer flags */
  47 #define SNAT_FLAG_HAIRPINNING (1 << 0)
  48
  49 typedef enum
  50 {
  51   NAT_NEXT_DROP,
  52   NAT_NEXT_ICMP_ERROR,
  53   NAT_NEXT_IN2OUT_PRE,
  54   NAT_NEXT_OUT2IN_PRE,
  55   NAT_NEXT_IN2OUT_ED_FAST_PATH,
  56   NAT_NEXT_IN2OUT_ED_SLOW_PATH,
  57   NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH,
  58   NAT_NEXT_OUT2IN_ED_FAST_PATH,
  59   NAT_NEXT_OUT2IN_ED_SLOW_PATH,
  60   NAT_N_NEXT,
  61 } nat_next_t;
  62
  63 typedef struct
  64 {
  65   u32 next_index;
  66 } nat_pre_trace_t;
  67
  68 /* session key (4-tuple) */
  69 typedef struct
  70 {
  71   union
  72   {
  73     struct
  74     {
  75       ip4_address_t addr;
  76       u16 port;
  77       u16 protocol:3, fib_index:13;
  78     };
  79     u64 as_u64;
  80   };
  81 } snat_session_key_t;
  82
  83 /* deterministic session outside key */
  84 typedef struct
  85 {
  86   union
  87   {
  88     struct
  89     {
  90       ip4_address_t ext_host_addr;
  91       u16 ext_host_port;
  92       u16 out_port;
  93     };
  94     u64 as_u64;
  95   };
  96 } snat_det_out_key_t;
  97
  98 /* user (internal host) key */
  99 typedef struct
 100 {
 101   union
 102   {
 103     struct
 104     {
 105       ip4_address_t addr;
 106       u32 fib_index;
 107     };
 108     u64 as_u64;
 109   };
 110 } snat_user_key_t;
 111
 112 /* NAT API Configuration flags */
 113 #define foreach_nat_config_flag \
 114   _(0x01, IS_TWICE_NAT)         \
 115   _(0x02, IS_SELF_TWICE_NAT)    \
 116   _(0x04, IS_OUT2IN_ONLY)       \
 117   _(0x08, IS_ADDR_ONLY)         \
 118   _(0x10, IS_OUTSIDE)           \
 119   _(0x20, IS_INSIDE)            \
 120   _(0x40, IS_STATIC)            \
 121   _(0x80, IS_EXT_HOST_VALID)    \
 122
 123 typedef enum nat_config_flags_t_
 124 {
 125 #define _(n,f) NAT_API_##f = n,
 126   foreach_nat_config_flag
 127 #undef _
 128 } nat_config_flags_t;
 129
 130 /* External address and port allocation modes */
 131 #define foreach_nat_addr_and_port_alloc_alg \
 132   _(0, DEFAULT, "default")         \
 133   _(1, MAPE, "map-e")              \
 134   _(2, RANGE, "port-range")
 135
 136 typedef enum
 137 {
 138 #define _(v, N, s) NAT_ADDR_AND_PORT_ALLOC_ALG_##N = v,
 139   foreach_nat_addr_and_port_alloc_alg
 140 #undef _
 141 } nat_addr_and_port_alloc_alg_t;
 142
 143
 144 /* Supported L4 protocols */
 145 #define foreach_snat_protocol \
 146   _(UDP, 0, udp, "udp")       \
 147   _(TCP, 1, tcp, "tcp")       \
 148   _(ICMP, 2, icmp, "icmp")
 149
 150 typedef enum
 151 {
 152 #define _(N, i, n, s) SNAT_PROTOCOL_##N = i,
 153   foreach_snat_protocol
 154 #undef _
 155 } snat_protocol_t;
 156
 157
 158 /* Session state */
 159 #define foreach_snat_session_state          \
 160   _(0, UNKNOWN, "unknown")                 \
 161   _(1, UDP_ACTIVE, "udp-active")           \
 162   _(2, TCP_SYN_SENT, "tcp-syn-sent")       \
 163   _(3, TCP_ESTABLISHED, "tcp-established") \
 164   _(4, TCP_FIN_WAIT, "tcp-fin-wait")       \
 165   _(5, TCP_CLOSE_WAIT, "tcp-close-wait")   \
 166   _(6, TCP_CLOSING, "tcp-closing")         \
 167   _(7, TCP_LAST_ACK, "tcp-last-ack")       \
 168   _(8, TCP_CLOSED, "tcp-closed")           \
 169   _(9, ICMP_ACTIVE, "icmp-active")
 170
 171 typedef enum
 172 {
 173 #define _(v, N, s) SNAT_SESSION_##N = v,
 174   foreach_snat_session_state
 175 #undef _
 176 } snat_session_state_t;
 177
 178 #define foreach_nat_in2out_ed_error                     \
 179 _(UNSUPPORTED_PROTOCOL, "unsupported protocol")         \
 180 _(IN2OUT_PACKETS, "good in2out packets processed")      \
 181 _(OUT_OF_PORTS, "out of ports")                         \
 182 _(BAD_ICMP_TYPE, "unsupported ICMP type")               \
 183 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded")   \
 184 _(MAX_USER_SESS_EXCEEDED, "max user sessions exceeded") \
 185 _(DROP_FRAGMENT, "drop fragment")                       \
 186 _(CANNOT_CREATE_USER, "cannot create NAT user")         \
 187 _(NON_SYN, "non-SYN packet try to create session")      \
 188 _(TCP_PACKETS, "TCP packets")                           \
 189 _(TCP_CLOSED, "drops due to TCP in transitory timeout") \
 190 _(UDP_PACKETS, "UDP packets")                           \
 191 _(ICMP_PACKETS, "ICMP packets")                         \
 192 _(OTHER_PACKETS, "other protocol packets")              \
 193 _(FRAGMENTS, "fragments")                               \
 194 _(CACHED_FRAGMENTS, "cached fragments")                 \
 195 _(PROCESSED_FRAGMENTS, "processed fragments")
 196
 197 typedef enum
 198 {
 199 #define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
 200   foreach_nat_in2out_ed_error
 201 #undef _
 202     NAT_IN2OUT_ED_N_ERROR,
 203 } nat_in2out_ed_error_t;
 204
 205 #define foreach_nat_out2in_ed_error                     \
 206 _(UNSUPPORTED_PROTOCOL, "unsupported protocol")         \
 207 _(OUT2IN_PACKETS, "good out2in packets processed")      \
 208 _(OUT_OF_PORTS, "out of ports")                         \
 209 _(BAD_ICMP_TYPE, "unsupported ICMP type")               \
 210 _(NO_TRANSLATION, "no translation")                     \
 211 _(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded")   \
 212 _(MAX_USER_SESS_EXCEEDED, "max user sessions exceeded") \
 213 _(DROP_FRAGMENT, "drop fragment")                       \
 214 _(CANNOT_CREATE_USER, "cannot create NAT user")         \
 215 _(NON_SYN, "non-SYN packet try to create session")      \
 216 _(TCP_PACKETS, "TCP packets")                           \
 217 _(TCP_CLOSED, "drops due to TCP in transitory timeout") \
 218 _(UDP_PACKETS, "UDP packets")                           \
 219 _(ICMP_PACKETS, "ICMP packets")                         \
 220 _(OTHER_PACKETS, "other protocol packets")              \
 221 _(FRAGMENTS, "fragments")                               \
 222 _(CACHED_FRAGMENTS, "cached fragments")                 \
 223 _(PROCESSED_FRAGMENTS, "processed fragments")
 224
 225 typedef enum
 226 {
 227 #define _(sym,str) NAT_OUT2IN_ED_ERROR_##sym,
 228   foreach_nat_out2in_ed_error
 229 #undef _
 230     NAT_OUT2IN_ED_N_ERROR,
 231 } nat_out2in_ed_error_t;
 232
 233
 234 /* Endpoint dependent TCP session state */
 235 #define NAT44_SES_I2O_FIN 1
 236 #define NAT44_SES_O2I_FIN 2
 237 #define NAT44_SES_I2O_FIN_ACK 4
 238 #define NAT44_SES_O2I_FIN_ACK 8
 239 #define NAT44_SES_I2O_SYN 16
 240 #define NAT44_SES_O2I_SYN 32
 241 #define NAT44_SES_RST     64
 242
 243 /* Session flags */
 244 #define SNAT_SESSION_FLAG_STATIC_MAPPING       1
 245 #define SNAT_SESSION_FLAG_UNKNOWN_PROTO        2
 246 #define SNAT_SESSION_FLAG_LOAD_BALANCING       4
 247 #define SNAT_SESSION_FLAG_TWICE_NAT            8
 248 #define SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT   16
 249 #define SNAT_SESSION_FLAG_FWD_BYPASS           32
 250 #define SNAT_SESSION_FLAG_AFFINITY             64
 251 #define SNAT_SESSION_FLAG_OUTPUT_FEATURE       128
 252
 253 /* NAT interface flags */
 254 #define NAT_INTERFACE_FLAG_IS_INSIDE 1
 255 #define NAT_INTERFACE_FLAG_IS_OUTSIDE 2
 256
 257 /* Static mapping flags */
 258 #define NAT_STATIC_MAPPING_FLAG_ADDR_ONLY    1
 259 #define NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY  2
 260 #define NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT 4
 261 #define NAT_STATIC_MAPPING_FLAG_LB           8
 262
 263 /* *INDENT-OFF* */
 264 typedef CLIB_PACKED(struct
 265 {
 266   /* Outside network key */
 267   snat_session_key_t out2in;
 268
 269   /* Inside network key */
 270   snat_session_key_t in2out;
 271
 272   /* Flags */
 273   u32 flags;
 274
 275   /* Per-user translations */
 276   u32 per_user_index;
 277   u32 per_user_list_head_index;
 278
 279   /* index in global LRU list */
 280   u32 global_lru_index;
 281   f64 last_lru_update;
 282
 283   /* Last heard timer */
 284   f64 last_heard;
 285
 286   /* Last HA refresh */
 287   f64 ha_last_refreshed;
 288
 289   /* Counters */
 290   u64 total_bytes;
 291   u32 total_pkts;
 292
 293   /* External host address and port */
 294   ip4_address_t ext_host_addr;
 295   u16 ext_host_port;
 296
 297   /* External host address and port after translation */
 298   ip4_address_t ext_host_nat_addr;
 299   u16 ext_host_nat_port;
 300
 301   /* TCP session state */
 302   u8 state;
 303   u32 i2o_fin_seq;
 304   u32 o2i_fin_seq;
 305   u32 tcp_close_timestamp;
 306
 307   /* user index */
 308   u32 user_index;
 309 }) snat_session_t;
 310 /* *INDENT-ON* */
 311
 312
 313 typedef struct
 314 {
 315   ip4_address_t addr;
 316   u32 fib_index;
 317   u32 sessions_per_user_list_head_index;
 318   u32 nsessions;
 319   u32 nstaticsessions;
 320 } snat_user_t;
 321
 322 typedef struct
 323 {
 324   ip4_address_t addr;
 325   u32 fib_index;
 326 /* *INDENT-OFF* */
 327 #define _(N, i, n, s) \
 328   u16 busy_##n##_ports; \
 329   u16 * busy_##n##_ports_per_thread; \
 330   u32 busy_##n##_port_refcounts[65535];
 331   foreach_snat_protocol
 332 #undef _
 333 /* *INDENT-ON* */
 334 } snat_address_t;
 335
 336 typedef struct
 337 {
 338   u32 fib_index;
 339   u32 refcount;
 340 } nat_outside_fib_t;
 341
 342 typedef struct
 343 {
 344   /* Inside network port */
 345   u16 in_port;
 346   /* Outside network address and port */
 347   snat_det_out_key_t out;
 348   /* Session state */
 349   u8 state;
 350   /* Expire timeout */
 351   u32 expire;
 352 } snat_det_session_t;
 353
 354 typedef struct
 355 {
 356   /* inside IP address range */
 357   ip4_address_t in_addr;
 358   u8 in_plen;
 359   /* outside IP address range */
 360   ip4_address_t out_addr;
 361   u8 out_plen;
 362   /* inside IP addresses / outside IP addresses */
 363   u32 sharing_ratio;
 364   /* number of ports available to internal host */
 365   u16 ports_per_host;
 366   /* session counter */
 367   u32 ses_num;
 368   /* vector of sessions */
 369   snat_det_session_t *sessions;
 370 } snat_det_map_t;
 371
 372 typedef struct
 373 {
 374   /* backend IP address */
 375   ip4_address_t addr;
 376   /* backend port number */
 377   u16 port;
 378   /* probability of the backend to be randomly matched */
 379   u8 probability;
 380   u8 prefix;
 381   /* backend FIB table */
 382   u32 vrf_id;
 383   u32 fib_index;
 384 } nat44_lb_addr_port_t;
 385
 386 typedef enum
 387 {
 388   /* twice-nat disabled */
 389   TWICE_NAT_DISABLED,
 390   /* twice-nat enabled */
 391   TWICE_NAT,
 392   /* twice-nat only when src IP equals dst IP after translation */
 393   TWICE_NAT_SELF,
 394 } twice_nat_type_t;
 395
 396 typedef enum
 397 {
 398   /* no load-balancing */
 399   NO_LB_NAT,
 400   /* load-balancing */
 401   LB_NAT,
 402   /* load-balancing with affinity */
 403   AFFINITY_LB_NAT,
 404 } lb_nat_type_t;
 405
 406 typedef struct
 407 {
 408   /* local IP address */
 409   ip4_address_t local_addr;
 410   /* external IP address */
 411   ip4_address_t external_addr;
 412   /* local port */
 413   u16 local_port;
 414   /* external port */
 415   u16 external_port;
 416   /* is twice-nat */
 417   twice_nat_type_t twice_nat;
 418   /* local FIB table */
 419   u32 vrf_id;
 420   u32 fib_index;
 421   /* protocol */
 422   snat_protocol_t proto;
 423   /* 0 = disabled, otherwise client IP affinity sticky time in seconds */
 424   u32 affinity;
 425   /* worker threads used by backends/local host */
 426   u32 *workers;
 427   /* opaque string tag */
 428   u8 *tag;
 429   /* backends for load-balancing mode */
 430   nat44_lb_addr_port_t *locals;
 431   /* affinity per service lis */
 432   u32 affinity_per_service_list_head_index;
 433   /* flags */
 434   u32 flags;
 435 } snat_static_mapping_t;
 436
 437 typedef struct
 438 {
 439   u32 sw_if_index;
 440   u8 flags;
 441 } snat_interface_t;
 442
 443 typedef struct
 444 {
 445   ip4_address_t l_addr;
 446   u16 l_port;
 447   u16 e_port;
 448   u32 sw_if_index;
 449   u32 vrf_id;
 450   snat_protocol_t proto;
 451   u32 flags;
 452   int addr_only;
 453   int twice_nat;
 454   int is_add;
 455   int out2in_only;
 456   int identity_nat;
 457   u8 *tag;
 458 } snat_static_map_resolve_t;
 459
 460 typedef struct
 461 {
 462   /* Main lookup tables */
 463   clib_bihash_8_8_t out2in;
 464   clib_bihash_8_8_t in2out;
 465
 466   /* Endpoint dependent sessions lookup tables */
 467   clib_bihash_16_8_t out2in_ed;
 468   clib_bihash_16_8_t in2out_ed;
 469
 470   /* Find-a-user => src address lookup */
 471   clib_bihash_8_8_t user_hash;
 472
 473   /* User pool */
 474   snat_user_t *users;
 475
 476   /* Session pool */
 477   snat_session_t *sessions;
 478
 479   /* Pool of doubly-linked list elements */
 480   dlist_elt_t *list_pool;
 481
 482   /* LRU session list - head is stale, tail is fresh */
 483   dlist_elt_t *global_lru_pool;
 484   u32 global_lru_head_index;
 485
 486   /* NAT thread index */
 487   u32 snat_thread_index;
 488
 489   /* real thread index */
 490   u32 thread_index;
 491
 492 } snat_main_per_thread_data_t;
 493
 494 struct snat_main_s;
 495
 496 /* ICMP session match function */
 497 typedef u32 (snat_icmp_match_function_t) (struct snat_main_s * sm,
 498                                           vlib_node_runtime_t * node,
 499                                           u32 thread_index,
 500                                           vlib_buffer_t * b0,
 501                                           ip4_header_t * ip0, u8 * p_proto,
 502                                           snat_session_key_t * p_value,
 503                                           u8 * p_dont_translate, void *d,
 504                                           void *e);
 505
 506 /* Return worker thread index for given packet */
 507 typedef u32 (snat_get_worker_in2out_function_t) (ip4_header_t * ip,
 508                                                  u32 rx_fib_index,
 509                                                  u8 is_output);
 510
 511 typedef u32 (snat_get_worker_out2in_function_t) (vlib_buffer_t * b,
 512                                                  ip4_header_t * ip,
 513                                                  u32 rx_fib_index,
 514                                                  u8 is_output);
 515
 516 /* NAT address and port allocation function */
 517 typedef int (nat_alloc_out_addr_and_port_function_t) (snat_address_t *
 518                                                       addresses,
 519                                                       u32 fib_index,
 520                                                       u32 thread_index,
 521                                                       snat_session_key_t * k,
 522                                                       u16 port_per_thread,
 523                                                       u32 snat_thread_index);
 524
 525
 526 typedef struct snat_main_s
 527 {
 528   /* ICMP session match functions */
 529   snat_icmp_match_function_t *icmp_match_in2out_cb;
 530   snat_icmp_match_function_t *icmp_match_out2in_cb;
 531
 532   /* Thread settings */
 533   u32 num_workers;
 534   u32 first_worker_index;
 535   u32 *workers;
 536   snat_get_worker_in2out_function_t *worker_in2out_cb;
 537   snat_get_worker_out2in_function_t *worker_out2in_cb;
 538   u16 port_per_thread;
 539   u32 num_snat_thread;
 540
 541   /* Per thread data */
 542   snat_main_per_thread_data_t *per_thread_data;
 543
 544   /* Find a static mapping by local */
 545   clib_bihash_8_8_t static_mapping_by_local;
 546
 547   /* Find a static mapping by external */
 548   clib_bihash_8_8_t static_mapping_by_external;
 549
 550   /* Static mapping pool */
 551   snat_static_mapping_t *static_mappings;
 552
 553   /* Interface pool */
 554   snat_interface_t *interfaces;
 555   snat_interface_t *output_feature_interfaces;
 556
 557   /* Vector of outside addresses */
 558   snat_address_t *addresses;
 559   /* Address and port allocation function */
 560   nat_alloc_out_addr_and_port_function_t *alloc_addr_and_port;
 561   /* Address and port allocation type */
 562   nat_addr_and_port_alloc_alg_t addr_and_port_alloc_alg;
 563   /* Port set parameters (MAP-E) */
 564   u8 psid_offset;
 565   u8 psid_length;
 566   u16 psid;
 567   /* Port range parameters */
 568   u16 start_port;
 569   u16 end_port;
 570
 571   /* vector of outside fibs */
 572   nat_outside_fib_t *outside_fibs;
 573
 574   /* Vector of twice NAT addresses for external hosts */
 575   snat_address_t *twice_nat_addresses;
 576
 577   /* sw_if_indices whose intfc addresses should be auto-added */
 578   u32 *auto_add_sw_if_indices;
 579   u32 *auto_add_sw_if_indices_twice_nat;
 580
 581   /* vector of interface address static mappings to resolve. */
 582   snat_static_map_resolve_t *to_resolve;
 583
 584   /* Randomize port allocation order */
 585   u32 random_seed;
 586
 587   /* Worker handoff frame-queue index */
 588   u32 fq_in2out_index;
 589   u32 fq_in2out_output_index;
 590   u32 fq_out2in_index;
 591
 592   /* node indexes */
 593   u32 error_node_index;
 594
 595   /* handoff fq nodes  */
 596   u32 handoff_out2in_index;
 597   u32 handoff_in2out_index;
 598   u32 handoff_in2out_output_index;
 599
 600   /* respect feature arc nodes */
 601   u32 pre_out2in_node_index;
 602   u32 pre_in2out_node_index;
 603
 604   u32 in2out_node_index;
 605   u32 in2out_output_node_index;
 606   u32 in2out_fast_node_index;
 607   u32 in2out_slowpath_node_index;
 608   u32 in2out_slowpath_output_node_index;
 609   u32 ed_in2out_node_index;
 610   u32 ed_in2out_slowpath_node_index;
 611   u32 out2in_node_index;
 612   u32 out2in_fast_node_index;
 613   u32 ed_out2in_node_index;
 614   u32 ed_out2in_slowpath_node_index;
 615   u32 det_in2out_node_index;
 616   u32 det_out2in_node_index;
 617
 618   u32 hairpinning_node_index;
 619   u32 hairpin_dst_node_index;
 620   u32 hairpin_src_node_index;
 621   u32 ed_hairpinning_node_index;
 622   u32 ed_hairpin_dst_node_index;
 623   u32 ed_hairpin_src_node_index;
 624
 625
 626   /* Deterministic NAT mappings */
 627   snat_det_map_t *det_maps;
 628
 629   /* If forwarding is enabled */
 630   u8 forwarding_enabled;
 631
 632   /* Config parameters */
 633   u8 static_mapping_only;
 634   u8 static_mapping_connection_tracking;
 635   u8 deterministic;
 636   u8 out2in_dpo;
 637   u8 endpoint_dependent;
 638
 639   u32 translation_buckets;
 640   uword translation_memory_size;
 641   u32 max_translations;
 642   u32 *max_translations_per_fib;
 643
 644   u32 user_buckets;
 645   uword user_memory_size;
 646   u32 max_translations_per_user;
 647
 648   u32 outside_vrf_id;
 649   u32 outside_fib_index;
 650   u32 inside_vrf_id;
 651   u32 inside_fib_index;
 652
 653   /* values of various timeouts */
 654   // proto timeouts
 655   u32 udp_timeout;
 656   u32 tcp_transitory_timeout;
 657   u32 tcp_established_timeout;
 658   u32 icmp_timeout;
 659
 660   /* TCP MSS clamping */
 661   u16 mss_clamping;
 662   u16 mss_value_net;
 663
 664   /* counters/gauges */
 665   vlib_simple_counter_main_t total_users;
 666   vlib_simple_counter_main_t total_sessions;
 667
 668   /* API message ID base */
 669   u16 msg_id_base;
 670
 671   /* log class */
 672   vlib_log_class_t log_class;
 673   /* logging level */
 674   u8 log_level;
 675
 676   /* convenience */
 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_static_mapping;
 720 format_function_t format_snat_static_map_to_resolve;
 721 format_function_t format_snat_session;
 722 format_function_t format_det_map_ses;
 723 format_function_t format_snat_key;
 724 format_function_t format_static_mapping_key;
 725 format_function_t format_snat_protocol;
 726 format_function_t format_nat_addr_and_port_alloc_alg;
 727 /* unformat functions */
 728 unformat_function_t unformat_snat_protocol;
 729
 730 /** \brief Check if SNAT session is created from static mapping.
 731     @param s SNAT session
 732     @return 1 if SNAT session is created from static mapping otherwise 0
 733 */
 734 #define snat_is_session_static(s) (s->flags & SNAT_SESSION_FLAG_STATIC_MAPPING)
 735
 736 /** \brief Check if SNAT session for unknown protocol.
 737     @param s SNAT session
 738     @return 1 if SNAT session for unknown protocol otherwise 0
 739 */
 740 #define snat_is_unk_proto_session(s) (s->flags & SNAT_SESSION_FLAG_UNKNOWN_PROTO)
 741
 742 /** \brief Check if NAT session is twice NAT.
 743     @param s NAT session
 744     @return 1 if NAT session is twice NAT
 745 */
 746 #define is_twice_nat_session(s) (s->flags & SNAT_SESSION_FLAG_TWICE_NAT)
 747
 748 /** \brief Check if NAT session is load-balancing.
 749     @param s NAT session
 750     @return 1 if NAT session is load-balancing
 751 */
 752 #define is_lb_session(s) (s->flags & SNAT_SESSION_FLAG_LOAD_BALANCING)
 753
 754 /** \brief Check if NAT session is forwarding bypass.
 755     @param s NAT session
 756     @return 1 if NAT session is load-balancing
 757 */
 758 #define is_fwd_bypass_session(s) (s->flags & SNAT_SESSION_FLAG_FWD_BYPASS)
 759
 760 /** \brief Check if NAT session is endpoint dependent.
 761     @param s NAT session
 762     @return 1 if NAT session is endpoint dependent
 763 */
 764 #define is_ed_session(s) (s->flags & SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT)
 765
 766 /** \brief Check if NAT session has affinity record.
 767     @param s NAT session
 768     @return 1 if NAT session has affinity record
 769 */
 770 #define is_affinity_sessions(s) (s->flags & SNAT_SESSION_FLAG_AFFINITY)
 771
 772 /** \brief Check if NAT interface is inside.
 773     @param i NAT interface
 774     @return 1 if inside interface
 775 */
 776 #define nat_interface_is_inside(i) i->flags & NAT_INTERFACE_FLAG_IS_INSIDE
 777
 778 /** \brief Check if NAT interface is outside.
 779     @param i NAT interface
 780     @return 1 if outside interface
 781 */
 782 #define nat_interface_is_outside(i) i->flags & NAT_INTERFACE_FLAG_IS_OUTSIDE
 783
 784 /** \brief Check if NAT44 endpoint-dependent TCP session is closed.
 785     @param s NAT session
 786     @return 1 if session is closed
 787 */
 788 #define nat44_is_ses_closed(s) s->state == 0xf
 789
 790 /** \brief Check if NAT static mapping is address only (1:1NAT).
 791     @param sm NAT static mapping
 792     @return 1 if 1:1NAT, 0 if 1:1NAPT
 793 */
 794 #define is_addr_only_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_ADDR_ONLY)
 795
 796 /** \brief Check if NAT static mapping match only out2in direction.
 797     @param sm NAT static mapping
 798     @return 1 if rule match only out2in direction
 799 */
 800 #define is_out2in_only_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY)
 801
 802 /** \brief Check if NAT static mapping is identity NAT.
 803     @param sm NAT static mapping
 804     @return 1 if identity NAT
 805 */
 806 #define is_identity_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT)
 807
 808 /** \brief Check if NAT static mapping is load-balancing.
 809     @param sm NAT static mapping
 810     @return 1 if load-balancing
 811 */
 812 #define is_lb_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_LB)
 813
 814 /** \brief Check if client initiating TCP connection (received SYN from client)
 815     @param t TCP header
 816     @return 1 if client initiating TCP connection
 817 */
 818 always_inline bool
 819 tcp_flags_is_init (u8 f)
 820 {
 821   return (f & TCP_FLAG_SYN) && !(f & TCP_FLAG_ACK);
 822 }
 823
 824 /* logging */
 825 #define nat_log_err(...) \
 826   vlib_log(VLIB_LOG_LEVEL_ERR, snat_main.log_class, __VA_ARGS__)
 827 #define nat_log_warn(...) \
 828   vlib_log(VLIB_LOG_LEVEL_WARNING, snat_main.log_class, __VA_ARGS__)
 829 #define nat_log_notice(...) \
 830   vlib_log(VLIB_LOG_LEVEL_NOTICE, snat_main.log_class, __VA_ARGS__)
 831 #define nat_log_info(...) \
 832   vlib_log(VLIB_LOG_LEVEL_INFO, snat_main.log_class, __VA_ARGS__)
 833 #define nat_log_debug(...)\
 834   vlib_log(VLIB_LOG_LEVEL_DEBUG, snat_main.log_class, __VA_ARGS__)
 835
 836 /* NAT API Logging Levels */
 837 #define foreach_nat_log_level \
 838   _(0x00, LOG_NONE)           \
 839   _(0x01, LOG_ERROR)          \
 840   _(0x02, LOG_WARNING)        \
 841   _(0x03, LOG_NOTICE)         \
 842   _(0x04, LOG_INFO)           \
 843   _(0x05, LOG_DEBUG)
 844
 845 typedef enum nat_log_level_t_
 846 {
 847 #define _(n,f) SNAT_##f = n,
 848   foreach_nat_log_level
 849 #undef _
 850 } nat_log_level_t;
 851
 852 #define nat_elog(_level, _str)                           \
 853 do                                                       \
 854   {                                                      \
 855     snat_main_t *sm = &snat_main;                        \
 856     if (PREDICT_FALSE (sm->log_level >= _level))         \
 857       {                                                  \
 858         ELOG_TYPE_DECLARE (e) =                          \
 859           {                                              \
 860             .format = "nat-msg " _str,                   \
 861             .format_args = "",                           \
 862           };                                             \
 863         ELOG_DATA (&vlib_global_main.elog_main, e);      \
 864       }                                                  \
 865   } while (0);
 866
 867 #define nat_elog_addr(_level, _str, _addr)               \
 868 do                                                       \
 869   {                                                      \
 870     if (PREDICT_FALSE (sm->log_level >= _level))         \
 871       {                                                  \
 872         ELOG_TYPE_DECLARE (e) =                          \
 873           {                                              \
 874             .format = "nat-msg " _str " %d.%d.%d.%d",    \
 875             .format_args = "i1i1i1i1",                   \
 876           };                                             \
 877         CLIB_PACKED(struct                               \
 878           {                                              \
 879             u8 oct1;                                     \
 880             u8 oct2;                                     \
 881             u8 oct3;                                     \
 882             u8 oct4;                                     \
 883           }) *ed;                                        \
 884         ed = ELOG_DATA (&vlib_global_main.elog_main, e); \
 885         ed->oct4 = _addr >> 24;                          \
 886         ed->oct3 = _addr >> 16;                          \
 887         ed->oct2 = _addr >> 8;                           \
 888         ed->oct1 = _addr;                                \
 889     }                                                    \
 890   } while (0);
 891
 892 #define nat_elog_debug_handoff(_str, _tid, _fib, _src, _dst)                \
 893 do                                                                          \
 894   {                                                                         \
 895   if (PREDICT_FALSE (sm->log_level >= SNAT_LOG_DEBUG))                      \
 896     {                                                                       \
 897       ELOG_TYPE_DECLARE (e) =                                               \
 898         {                                                                   \
 899           .format = "nat-msg " _str " ip src: %d.%d.%d.%d dst: %d.%d.%d.%d" \
 900                                     " tid from: %d to: %d fib: %d",         \
 901         .format_args = "i1i1i1i1i1i1i1i1i4i4i4",                            \
 902       };                                                                    \
 903       CLIB_PACKED(struct                                                    \
 904         {                                                                   \
 905           u8 src_oct1;                                                      \
 906           u8 src_oct2;                                                      \
 907           u8 src_oct3;                                                      \
 908           u8 src_oct4;                                                      \
 909           u8 dst_oct1;                                                      \
 910           u8 dst_oct2;                                                      \
 911           u8 dst_oct3;                                                      \
 912           u8 dst_oct4;                                                      \
 913           u32 ftid;                                                         \
 914           u32 ttid;                                                         \
 915           u32 fib;                                                          \
 916         }) *ed;                                                             \
 917       ed = ELOG_DATA (&vlib_global_main.elog_main, e);                      \
 918       ed->src_oct1 = _src >> 24;                                            \
 919       ed->src_oct2 = _src >> 16;                                            \
 920       ed->src_oct3 = _src >> 8;                                             \
 921       ed->src_oct4 = _src;                                                  \
 922       ed->dst_oct1 = _dst >> 24;                                            \
 923       ed->dst_oct2 = _dst >> 16;                                            \
 924       ed->dst_oct3 = _dst >> 8;                                             \
 925       ed->dst_oct4 = _dst;                                                  \
 926       ed->ftid = vlib_get_thread_index ();                                  \
 927       ed->ttid = _tid;                                                      \
 928       ed->fib = _fib;                                                       \
 929     }                                                                       \
 930   } while (0);
 931
 932 #define nat_elog_debug_handoff_v2(_str, _prt, _fib, _src, _dst)              \
 933 do                                                                           \
 934   {                                                                          \
 935   if (PREDICT_FALSE (sm->log_level >= SNAT_LOG_DEBUG))                       \
 936     {                                                                        \
 937       ELOG_TYPE_DECLARE (e) =                                                \
 938         {                                                                    \
 939           .format = "nat-msg " _str " ip_src:%d.%d.%d.%d ip_dst:%d.%d.%d.%d" \
 940                                     " tid:%d prt:%d fib:%d",                 \
 941         .format_args = "i1i1i1i1i1i1i1i1i4i4i4",                             \
 942       };                                                                     \
 943       CLIB_PACKED(struct                                                     \
 944         {                                                                    \
 945           u8 src_oct1;                                                       \
 946           u8 src_oct2;                                                       \
 947           u8 src_oct3;                                                       \
 948           u8 src_oct4;                                                       \
 949           u8 dst_oct1;                                                       \
 950           u8 dst_oct2;                                                       \
 951           u8 dst_oct3;                                                       \
 952           u8 dst_oct4;                                                       \
 953           u32 tid;                                                           \
 954           u32 prt;                                                           \
 955           u32 fib;                                                           \
 956         }) *ed;                                                              \
 957       ed = ELOG_DATA (&vlib_global_main.elog_main, e);                       \
 958       ed->src_oct1 = _src >> 24;                                             \
 959       ed->src_oct2 = _src >> 16;                                             \
 960       ed->src_oct3 = _src >> 8;                                              \
 961       ed->src_oct4 = _src;                                                   \
 962       ed->dst_oct1 = _dst >> 24;                                             \
 963       ed->dst_oct2 = _dst >> 16;                                             \
 964       ed->dst_oct3 = _dst >> 8;                                              \
 965       ed->dst_oct4 = _dst;                                                   \
 966       ed->tid = vlib_get_thread_index ();                                    \
 967       ed->prt = _prt;                                                        \
 968       ed->fib = _fib;                                                        \
 969     }                                                                        \
 970   } while (0);
 971
 972 #define nat_elog_X1(_level, _fmt, _arg, _val1)            \
 973 do                                                        \
 974   {                                                       \
 975     snat_main_t *sm = &snat_main;                         \
 976     if (PREDICT_FALSE (sm->log_level >= _level))          \
 977       {                                                   \
 978         ELOG_TYPE_DECLARE (e) =                           \
 979           {                                               \
 980             .format = "nat-msg " _fmt,                    \
 981             .format_args = _arg,                          \
 982           };                                              \
 983         CLIB_PACKED(struct                                \
 984           {                                               \
 985             typeof (_val1) val1;                          \
 986           }) *ed;                                         \
 987         ed = ELOG_DATA (&vlib_global_main.elog_main, e);  \
 988         ed->val1 = _val1;                                 \
 989       }                                                   \
 990   } while (0);
 991
 992 #define nat_elog_notice(nat_elog_str) \
 993   nat_elog(SNAT_LOG_INFO, "[notice] " nat_elog_str)
 994 #define nat_elog_warn(nat_elog_str) \
 995   nat_elog(SNAT_LOG_WARNING, "[warning] " nat_elog_str)
 996 #define nat_elog_err(nat_elog_str) \
 997   nat_elog(SNAT_LOG_ERROR, "[error] " nat_elog_str)
 998 #define nat_elog_debug(nat_elog_str) \
 999   nat_elog(SNAT_LOG_DEBUG, "[debug] " nat_elog_str)
1000 #define nat_elog_info(nat_elog_str) \
1001   nat_elog(SNAT_LOG_INFO, "[info] " nat_elog_str)
1002
1003 #define nat_elog_notice_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1004   nat_elog_X1(SNAT_LOG_NOTICE, "[notice] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1005 #define nat_elog_warn_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1006   nat_elog_X1(SNAT_LOG_WARNING, "[warning] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1007 #define nat_elog_err_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1008   nat_elog_X1(SNAT_LOG_ERROR, "[error] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1009 #define nat_elog_debug_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1010   nat_elog_X1(SNAT_LOG_DEBUG, "[debug] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1011 #define nat_elog_info_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
1012   nat_elog_X1(SNAT_LOG_INFO, "[info] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
1013
1014 /* ICMP session match functions */
1015 u32 icmp_match_in2out_fast (snat_main_t * sm, vlib_node_runtime_t * node,
1016                             u32 thread_index, vlib_buffer_t * b0,
1017                             ip4_header_t * ip0, u8 * p_proto,
1018                             snat_session_key_t * p_value,
1019                             u8 * p_dont_translate, void *d, void *e);
1020 u32 icmp_match_in2out_slow (snat_main_t * sm, vlib_node_runtime_t * node,
1021                             u32 thread_index, vlib_buffer_t * b0,
1022                             ip4_header_t * ip0, u8 * p_proto,
1023                             snat_session_key_t * p_value,
1024                             u8 * p_dont_translate, void *d, void *e);
1025 u32 icmp_match_out2in_fast (snat_main_t * sm, vlib_node_runtime_t * node,
1026                             u32 thread_index, vlib_buffer_t * b0,
1027                             ip4_header_t * ip0, u8 * p_proto,
1028                             snat_session_key_t * p_value,
1029                             u8 * p_dont_translate, void *d, void *e);
1030 u32 icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node,
1031                             u32 thread_index, vlib_buffer_t * b0,
1032                             ip4_header_t * ip0, u8 * p_proto,
1033                             snat_session_key_t * p_value,
1034                             u8 * p_dont_translate, void *d, void *e);
1035
1036 /* ICMP deterministic NAT session match functions */
1037 u32 icmp_match_out2in_det (snat_main_t * sm, vlib_node_runtime_t * node,
1038                            u32 thread_index, vlib_buffer_t * b0,
1039                            ip4_header_t * ip0, u8 * p_proto,
1040                            snat_session_key_t * p_value,
1041                            u8 * p_dont_translate, void *d, void *e);
1042 u32 icmp_match_in2out_det (snat_main_t * sm, vlib_node_runtime_t * node,
1043                            u32 thread_index, vlib_buffer_t * b0,
1044                            ip4_header_t * ip0, u8 * p_proto,
1045                            snat_session_key_t * p_value,
1046                            u8 * p_dont_translate, void *d, void *e);
1047
1048 /* ICMP endpoint-dependent session match functions */
1049 u32 icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node,
1050                           u32 thread_index, vlib_buffer_t * b0,
1051                           ip4_header_t * ip0, u8 * p_proto,
1052                           snat_session_key_t * p_value,
1053                           u8 * p_dont_translate, void *d, void *e);
1054 u32 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
1055                           u32 thread_index, vlib_buffer_t * b0,
1056                           ip4_header_t * ip0, u8 * p_proto,
1057                           snat_session_key_t * p_value,
1058                           u8 * p_dont_translate, void *d, void *e);
1059
1060 u32 icmp_in2out (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0,
1061                  icmp46_header_t * icmp0, u32 sw_if_index0, u32 rx_fib_index0,
1062                  vlib_node_runtime_t * node, u32 next0, u32 thread_index,
1063                  void *d, void *e);
1064
1065 u32 icmp_out2in (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0,
1066                  icmp46_header_t * icmp0, u32 sw_if_index0, u32 rx_fib_index0,
1067                  vlib_node_runtime_t * node, u32 next0, u32 thread_index,
1068                  void *d, void *e);
1069
1070 /* hairpinning functions */
1071 u32 snat_icmp_hairpinning (snat_main_t * sm, vlib_buffer_t * b0,
1072                            ip4_header_t * ip0, icmp46_header_t * icmp0,
1073                            int is_ed);
1074 void nat_hairpinning_sm_unknown_proto (snat_main_t * sm, vlib_buffer_t * b,
1075                                        ip4_header_t * ip);
1076 void nat44_ed_hairpinning_unknown_proto (snat_main_t * sm, vlib_buffer_t * b,
1077                                          ip4_header_t * ip);
1078 int snat_hairpinning (snat_main_t * sm, vlib_buffer_t * b0,
1079                       ip4_header_t * ip0, udp_header_t * udp0,
1080                       tcp_header_t * tcp0, u32 proto0, int is_ed);
1081
1082 /* Call back functions for clib_bihash_add_or_overwrite_stale */
1083 int nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg);
1084 int nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg);
1085 int nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg);
1086 int nat44_o2i_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg);
1087
1088 /**
1089  * @brief Add external address to NAT44 pool
1090  *
1091  * @param sm        snat global configuration data
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 sm        snat global configuration data
1105  * @param addr      IPv4 address
1106  * @param delete_sm 1 if delete static mapping using address
1107  * @param twice_nat 1 if twice NAT address
1108  *
1109  * @return 0 on success, non-zero value otherwise
1110  */
1111 int snat_del_address (snat_main_t * sm, ip4_address_t addr, u8 delete_sm,
1112                       u8 twice_nat);
1113
1114 /**
1115  * @brief Add/delete external address to FIB DPO (out2in DPO mode)
1116  *
1117  * @param addr   IPv4 address
1118  * @param is_add 1 = add, 0 = delete
1119  *
1120  * @return 0 on success, non-zero value otherwise
1121  */
1122 void nat44_add_del_address_dpo (ip4_address_t addr, u8 is_add);
1123
1124 /**
1125  * @brief Add/delete NAT44 static mapping
1126  *
1127  * @param l_addr       local IPv4 address
1128  * @param e_addr       external IPv4 address
1129  * @param l_port       local port number
1130  * @param e_port       external port number
1131  * @param vrf_id       local VRF ID
1132  * @param addr_only    1 = 1:1NAT, 0 = 1:1NAPT
1133  * @param sw_if_index  use interface address as external IPv4 address
1134  * @param proto        L4 protocol
1135  * @param is_add       1 = add, 0 = delete
1136  * @param twice_nat    twice-nat mode
1137  * @param out2in_only  if 1 rule match only out2in direction
1138  * @param tag          opaque string tag
1139  * @param identity_nat identity NAT
1140  *
1141  * @return 0 on success, non-zero value otherwise
1142  */
1143 int snat_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
1144                              u16 l_port, u16 e_port, u32 vrf_id,
1145                              int addr_only, u32 sw_if_index,
1146                              snat_protocol_t proto, int is_add,
1147                              twice_nat_type_t twice_nat, u8 out2in_only,
1148                              u8 * tag, u8 identity_nat);
1149
1150 /**
1151  * @brief Add/delete static mapping with load-balancing (multiple backends)
1152  *
1153  * @param e_addr      external IPv4 address
1154  * @param e_port      external port number
1155  * @param proto       L4 protocol
1156  * @param locals      list of local backends
1157  * @param is_add      1 = add, 0 = delete
1158  * @param twice_nat   twice-nat mode
1159  * @param out2in_only if 1 rule match only out2in direction
1160  * @param tag         opaque string tag
1161  * @param affinity    0 = disabled, otherwise client IP affinity sticky time
1162  *
1163  * @return 0 on success, non-zero value otherwise
1164  */
1165 int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
1166                                      snat_protocol_t proto,
1167                                      nat44_lb_addr_port_t * locals, u8 is_add,
1168                                      twice_nat_type_t twice_nat,
1169                                      u8 out2in_only, u8 * tag, u32 affinity);
1170
1171 int nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port,
1172                                            ip4_address_t l_addr, u16 l_port,
1173                                            snat_protocol_t proto, u32 vrf_id,
1174                                            u8 probability, u8 is_add);
1175
1176 clib_error_t *snat_api_init (vlib_main_t * vm, snat_main_t * sm);
1177
1178 /**
1179  * @brief Set NAT plugin workers
1180  *
1181  * @param bitmap NAT workers bitmap
1182  *
1183  * @return 0 on success, non-zero value otherwise
1184  */
1185 int snat_set_workers (uword * bitmap);
1186
1187 /**
1188  * @brief Enable/disable NAT44 feature on the interface
1189  *
1190  * @param sw_if_index software index of the interface
1191  * @param is_inside   1 = inside, 0 = outside
1192  * @param is_del      1 = delete, 0 = add
1193  *
1194  * @return 0 on success, non-zero value otherwise
1195  */
1196 int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del);
1197
1198 /**
1199  * @brief Enable/disable NAT44 output feature on the interface (postrouting NAT)
1200  *
1201  * @param sw_if_index software index of the interface
1202  * @param is_inside   1 = inside, 0 = outside
1203  * @param is_del      1 = delete, 0 = add
1204  *
1205  * @return 0 on success, non-zero value otherwise
1206  */
1207 int snat_interface_add_del_output_feature (u32 sw_if_index, u8 is_inside,
1208                                            int is_del);
1209
1210 /**
1211  * @brief Add/delete NAT44 pool address from specific interface
1212  *
1213  * @param sw_if_index software index of the interface
1214  * @param is_del      1 = delete, 0 = add
1215  * @param twice_nat   1 = twice NAT address for external hosts
1216  *
1217  * @return 0 on success, non-zero value otherwise
1218  */
1219 int snat_add_interface_address (snat_main_t * sm, u32 sw_if_index, int is_del,
1220                                 u8 twice_nat);
1221
1222 /**
1223  * @brief Delete NAT44 session
1224  *
1225  * @param addr   IPv4 address
1226  * @param port   L4 port number
1227  * @param proto  L4 protocol
1228  * @param vrf_id VRF ID
1229  * @param is_in  1 = inside network address and port pair, 0 = outside
1230  *
1231  * @return 0 on success, non-zero value otherwise
1232  */
1233 int nat44_del_session (snat_main_t * sm, ip4_address_t * addr, u16 port,
1234                        snat_protocol_t proto, u32 vrf_id, int is_in);
1235
1236 /**
1237  * @brief Delete NAT44 endpoint-dependent session
1238  *
1239  * @param sm     snat global configuration data
1240  * @param addr   IPv4 address
1241  * @param port   L4 port number
1242  * @param proto  L4 protocol
1243  * @param vrf_id VRF ID
1244  * @param is_in  1 = inside network address and port pair, 0 = outside
1245  *
1246  * @return 0 on success, non-zero value otherwise
1247  */
1248 int nat44_del_ed_session (snat_main_t * sm, ip4_address_t * addr, u16 port,
1249                           ip4_address_t * eh_addr, u16 eh_port, u8 proto,
1250                           u32 vrf_id, int is_in);
1251
1252 /**
1253  * @brief Free NAT44 session data (lookup keys, external address port)
1254  *
1255  * @param sm           snat global configuration data
1256  * @param s            NAT session
1257  * @param thread_index thread index
1258  * @param is_ha        is HA event
1259  */
1260 void nat_free_session_data (snat_main_t * sm, snat_session_t * s,
1261                             u32 thread_index, u8 is_ha);
1262
1263 /**
1264  * @brief Set NAT44 session limit (session limit, vrf id)
1265  *
1266  * @param session_limit Session limit
1267  * @param vrf_id        VRF id
1268  * @return 0 on success, non-zero value otherwise
1269  */
1270 int nat44_set_session_limit (u32 session_limit, u32 vrf_id);
1271
1272 /**
1273  * @brief Free NAT44 ED session data (lookup keys, external address port)
1274  *
1275  * @param s            NAT session
1276  * @param thread_index thread index
1277  * @param is_ha        is HA event
1278  */
1279 void
1280 nat44_free_session_data (snat_main_t * sm, snat_session_t * s,
1281                          u32 thread_index, u8 is_ha);
1282
1283 /**
1284  * @brief Initialize NAT44 data
1285  *
1286  * @param tsm          per thread data
1287  */
1288 void nat44_db_init (snat_main_per_thread_data_t * tsm);
1289
1290 /**
1291  * @brief Free NAT44 data
1292  *
1293  * @param tsm          per thread data
1294  */
1295 void nat44_db_free (snat_main_per_thread_data_t * tsm);
1296
1297 /**
1298  * @brief Find or create NAT user
1299  *
1300  * @param sm           snat global configuration data
1301  * @param addr         IPv4 address
1302  * @param fib_index    FIB table index
1303  * @param thread_index thread index
1304  *
1305  * @return NAT user data structure on success otherwise zero value
1306  */
1307 snat_user_t *nat_user_get_or_create (snat_main_t * sm,
1308                                      ip4_address_t * addr, u32 fib_index,
1309                                      u32 thread_index);
1310
1311 /**
1312  * @brief Allocate new NAT session or recycle last used
1313  *
1314  * @param sm           snat global configuration data
1315  * @param u            NAT user
1316  * @param thread_index thread index
1317  * @param now          time now
1318  *
1319  * @return session data structure on success otherwise zero value
1320  */
1321 snat_session_t *nat_session_alloc_or_recycle (snat_main_t * sm,
1322                                               snat_user_t * u,
1323                                               u32 thread_index, f64 now);
1324
1325 /**
1326  * @brief Allocate NAT endpoint-dependent session
1327  *
1328  * @param sm           snat global configuration data
1329  * @param thread_index thread index
1330  * @param now          time now
1331  *
1332  * @return session data structure on success otherwise zero value
1333  */
1334 snat_session_t *nat_ed_session_alloc (snat_main_t * sm, u32 thread_index,
1335                                       f64 now);
1336
1337 /**
1338  * @brief Set address and port assignment algorithm for MAP-E CE
1339  *
1340  * @param psid        Port Set Identifier value
1341  * @param psid_offset number of offset bits
1342  * @param psid_length length of PSID
1343  */
1344 void nat_set_alloc_addr_and_port_mape (u16 psid, u16 psid_offset,
1345                                        u16 psid_length);
1346
1347 /**
1348  * @brief Set address and port assignment algorithm for port range
1349  *
1350  * @param start_port beginning of the port range
1351  * @param end_port   end of the port range
1352  */
1353 void nat_set_alloc_addr_and_port_range (u16 start_port, u16 end_port);
1354
1355 /**
1356  * @brief Set address and port assignment algorithm to default/standard
1357  */
1358 void nat_set_alloc_addr_and_port_default (void);
1359
1360 /**
1361  * @brief Free outside address and port pair
1362  *
1363  * @param addresses    vector of outside addresses
1364  * @param thread_index thread index
1365  * @param k            address, port and protocol
1366  */
1367 void snat_free_outside_address_and_port (snat_address_t * addresses,
1368                                          u32 thread_index,
1369                                          snat_session_key_t * k);
1370
1371 /**
1372  * @brief Alloc outside address and port
1373  *
1374  * @param addresses         vector of outside addresses
1375  * @param fib_index         FIB table index
1376  * @param thread_index      thread index
1377  * @param k                 allocated address and port pair
1378  * @param port_per_thread   number of ports per thread
1379  * @param snat_thread_index NAT thread index
1380  *
1381  * @return 0 on success, non-zero value otherwise
1382  */
1383 int snat_alloc_outside_address_and_port (snat_address_t * addresses,
1384                                          u32 fib_index,
1385                                          u32 thread_index,
1386                                          snat_session_key_t * k,
1387                                          u16 port_per_thread,
1388                                          u32 snat_thread_index);
1389
1390 /**
1391  * @brief Match NAT44 static mapping.
1392  *
1393  * @param match         address and port to match
1394  * @param mapping       external/local address and port of the matched mapping
1395  * @param by_external   if 0 match by local address otherwise match by external
1396  *                      address
1397  * @param is_addr_only  1 if matched mapping is address only
1398  * @param twice_nat     matched mapping is twice NAT type
1399  * @param lb            1 if matched mapping is load-balanced
1400  * @param ext_host_addr external host address
1401  *
1402  * @returns 0 if match found otherwise 1.
1403  */
1404 int snat_static_mapping_match (snat_main_t * sm,
1405                                snat_session_key_t match,
1406                                snat_session_key_t * mapping,
1407                                u8 by_external,
1408                                u8 * is_addr_only,
1409                                twice_nat_type_t * twice_nat,
1410                                lb_nat_type_t * lb,
1411                                ip4_address_t * ext_host_addr,
1412                                u8 * is_identity_nat);
1413
1414 /**
1415  * @brief Add/del NAT address to FIB.
1416  *
1417  * Add the external NAT address to the FIB as receive entries. This ensures
1418  * that VPP will reply to ARP for this address and we don't need to enable
1419  * proxy ARP on the outside interface.
1420  *
1421  * @param addr        IPv4 address
1422  * @param plen        address prefix length
1423  * @param sw_if_index software index of the outside interface
1424  * @param is_add      0 = delete, 1 = add.
1425  */
1426 void snat_add_del_addr_to_fib (ip4_address_t * addr,
1427                                u8 p_len, u32 sw_if_index, int is_add);
1428
1429 /*
1430  * Why is this here? Because we don't need to touch this layer to
1431  * simply reply to an icmp. We need to change id to a unique
1432  * value to NAT an echo request/reply.
1433  */
1434
1435 typedef struct
1436 {
1437   u16 identifier;
1438   u16 sequence;
1439 } icmp_echo_header_t;
1440
1441 typedef struct
1442 {
1443   u16 src_port, dst_port;
1444 } tcp_udp_header_t;
1445
1446 int nat_global_lru_free_one (snat_main_t * sm, int thread_index, f64 now);
1447
1448 #endif /* __included_nat_h__ */
1449 /*
1450  * fd.io coding-style-patch-verification: ON
1451  *
1452  * Local Variables:
1453  * eval: (c-set-style "gnu")
1454  * End:
1455  */