2 * Copyright (c) 2020 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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 * NAT plugin global declarations
19 #ifndef __included_nat44_ed_h__
20 #define __included_nat44_ed_h__
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/hash.h>
32 #include <vppinfra/dlist.h>
33 #include <vppinfra/error.h>
34 #include <vlibapi/api.h>
36 #include <nat/lib/lib.h>
37 #include <nat/lib/inlines.h>
39 /* default number of worker handoff frame queue elements */
40 #define NAT_FQ_NELTS_DEFAULT 64
42 /* NAT buffer flags */
43 #define SNAT_FLAG_HAIRPINNING (1 << 0)
45 /* NAT44 API Configuration flags */
46 #define foreach_nat44_config_flag \
47 _(0x00, IS_ENDPOINT_INDEPENDENT) \
48 _(0x01, IS_ENDPOINT_DEPENDENT) \
49 _(0x02, IS_STATIC_MAPPING_ONLY) \
50 _(0x04, IS_CONNECTION_TRACKING) \
51 _(0x08, IS_OUT2IN_DPO)
53 typedef enum nat44_config_flags_t_
55 #define _(n,f) NAT44_API_##f = n,
56 foreach_nat44_config_flag
58 } nat44_config_flags_t;
62 /* nat44 plugin features */
63 u8 static_mapping_only;
64 u8 connection_tracking;
69 /* maximum number of sessions */
78 NAT_NEXT_IN2OUT_ED_FAST_PATH,
79 NAT_NEXT_IN2OUT_ED_SLOW_PATH,
80 NAT_NEXT_IN2OUT_ED_OUTPUT_FAST_PATH,
81 NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH,
82 NAT_NEXT_OUT2IN_ED_FAST_PATH,
83 NAT_NEXT_OUT2IN_ED_SLOW_PATH,
84 NAT_NEXT_IN2OUT_CLASSIFY,
85 NAT_NEXT_OUT2IN_CLASSIFY,
95 /* External address and port allocation modes */
96 #define foreach_nat_addr_and_port_alloc_alg \
97 _(0, DEFAULT, "default") \
99 _(2, RANGE, "port-range")
103 #define _(v, N, s) NAT_ADDR_AND_PORT_ALLOC_ALG_##N = v,
104 foreach_nat_addr_and_port_alloc_alg
106 } nat_addr_and_port_alloc_alg_t;
109 #define foreach_snat_session_state \
110 _(0, UNKNOWN, "unknown") \
111 _(1, UDP_ACTIVE, "udp-active") \
112 _(2, TCP_SYN_SENT, "tcp-syn-sent") \
113 _(3, TCP_ESTABLISHED, "tcp-established") \
114 _(4, TCP_FIN_WAIT, "tcp-fin-wait") \
115 _(5, TCP_CLOSE_WAIT, "tcp-close-wait") \
116 _(6, TCP_CLOSING, "tcp-closing") \
117 _(7, TCP_LAST_ACK, "tcp-last-ack") \
118 _(8, TCP_CLOSED, "tcp-closed") \
119 _(9, ICMP_ACTIVE, "icmp-active")
123 #define _(v, N, s) SNAT_SESSION_##N = v,
124 foreach_snat_session_state
126 } snat_session_state_t;
128 #define foreach_nat_in2out_ed_error \
129 _ (UNSUPPORTED_PROTOCOL, "unsupported protocol") \
130 _ (OUT_OF_PORTS, "out of ports") \
131 _ (BAD_ICMP_TYPE, "unsupported ICMP type") \
132 _ (MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
133 _ (NON_SYN, "non-SYN packet try to create session") \
134 _ (TCP_CLOSED, "drops due to TCP in transitory timeout") \
135 _ (TRNSL_FAILED, "couldn't translate packet")
139 #define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
140 foreach_nat_in2out_ed_error
142 NAT_IN2OUT_ED_N_ERROR,
143 } nat_in2out_ed_error_t;
145 #define foreach_nat_out2in_ed_error \
146 _ (UNSUPPORTED_PROTOCOL, "unsupported protocol") \
147 _ (OUT_OF_PORTS, "out of ports") \
148 _ (BAD_ICMP_TYPE, "unsupported ICMP type") \
149 _ (NO_TRANSLATION, "no translation") \
150 _ (MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
151 _ (NON_SYN, "non-SYN packet try to create session") \
152 _ (TCP_CLOSED, "drops due to TCP in transitory timeout") \
153 _ (HASH_ADD_FAILED, "hash table add failed") \
154 _ (TRNSL_FAILED, "couldn't translate packet")
158 #define _(sym,str) NAT_OUT2IN_ED_ERROR_##sym,
159 foreach_nat_out2in_ed_error
161 NAT_OUT2IN_ED_N_ERROR,
162 } nat_out2in_ed_error_t;
165 /* Endpoint dependent TCP session state */
166 #define NAT44_SES_I2O_FIN 1
167 #define NAT44_SES_O2I_FIN 2
168 #define NAT44_SES_I2O_FIN_ACK 4
169 #define NAT44_SES_O2I_FIN_ACK 8
170 #define NAT44_SES_I2O_SYN 16
171 #define NAT44_SES_O2I_SYN 32
172 #define NAT44_SES_RST 64
175 #define SNAT_SESSION_FLAG_STATIC_MAPPING (1 << 0)
176 #define SNAT_SESSION_FLAG_UNKNOWN_PROTO (1 << 1)
177 #define SNAT_SESSION_FLAG_LOAD_BALANCING (1 << 2)
178 #define SNAT_SESSION_FLAG_TWICE_NAT (1 << 3)
179 #define SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT (1 << 4)
180 #define SNAT_SESSION_FLAG_FWD_BYPASS (1 << 5)
181 #define SNAT_SESSION_FLAG_AFFINITY (1 << 6)
182 #define SNAT_SESSION_FLAG_EXACT_ADDRESS (1 << 7)
183 #define SNAT_SESSION_FLAG_HAIRPINNING (1 << 8)
185 /* NAT interface flags */
186 #define NAT_INTERFACE_FLAG_IS_INSIDE 1
187 #define NAT_INTERFACE_FLAG_IS_OUTSIDE 2
189 /* Static mapping flags */
190 #define NAT_STATIC_MAPPING_FLAG_ADDR_ONLY 1
191 #define NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY 2
192 #define NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT 4
193 #define NAT_STATIC_MAPPING_FLAG_LB 8
194 #define NAT_STATIC_MAPPING_FLAG_EXACT_ADDRESS 16
196 typedef CLIB_PACKED(struct
198 // number of sessions in this vrf
204 // is this vrf expired
206 }) per_vrf_sessions_t;
212 ip4_address_t saddr, daddr;
213 u16 sport; // ICMP id for ICMP case
222 STATIC_ASSERT_SIZEOF (nat_6t_t, 2 * sizeof (u64));
226 #define NAT_FLOW_OP_SADDR_REWRITE (1 << 1)
227 #define NAT_FLOW_OP_SPORT_REWRITE (1 << 2)
228 #define NAT_FLOW_OP_DADDR_REWRITE (1 << 3)
229 #define NAT_FLOW_OP_DPORT_REWRITE (1 << 4)
230 #define NAT_FLOW_OP_ICMP_ID_REWRITE (1 << 5)
231 #define NAT_FLOW_OP_TXFIB_REWRITE (1 << 6)
236 ip4_address_t saddr, daddr;
247 void nat44_ed_forwarding_enable_disable (u8 is_enable);
250 nat_6t_flow_saddr_rewrite_set (nat_6t_flow_t *f, u32 saddr)
252 f->ops |= NAT_FLOW_OP_SADDR_REWRITE;
253 f->rewrite.saddr.as_u32 = saddr;
257 nat_6t_flow_daddr_rewrite_set (nat_6t_flow_t *f, u32 daddr)
259 f->ops |= NAT_FLOW_OP_DADDR_REWRITE;
260 f->rewrite.daddr.as_u32 = daddr;
264 nat_6t_flow_sport_rewrite_set (nat_6t_flow_t *f, u32 sport)
266 f->ops |= NAT_FLOW_OP_SPORT_REWRITE;
267 f->rewrite.sport = sport;
271 nat_6t_flow_dport_rewrite_set (nat_6t_flow_t *f, u32 dport)
273 f->ops |= NAT_FLOW_OP_DPORT_REWRITE;
274 f->rewrite.dport = dport;
278 nat_6t_flow_txfib_rewrite_set (nat_6t_flow_t *f, u32 tx_fib_index)
280 f->ops |= NAT_FLOW_OP_TXFIB_REWRITE;
281 f->rewrite.fib_index = tx_fib_index;
285 nat_6t_flow_icmp_id_rewrite_set (nat_6t_flow_t *f, u16 id)
287 f->ops |= NAT_FLOW_OP_ICMP_ID_REWRITE;
288 f->rewrite.icmp_id = id;
291 typedef CLIB_PACKED(struct
293 /* Outside network tuple */
301 /* Inside network tuple */
309 nat_protocol_t nat_proto;
317 /* head of LRU list in which this session is tracked */
319 /* index in global LRU list */
323 /* Last heard timer */
326 /* Last HA refresh */
327 f64 ha_last_refreshed;
333 /* External host address and port */
334 ip4_address_t ext_host_addr;
337 /* External host address and port after translation */
338 ip4_address_t ext_host_nat_addr;
339 u16 ext_host_nat_port;
341 /* TCP session state */
345 u64 tcp_closed_timestamp;
347 /* per vrf sessions index */
348 u32 per_vrf_sessions_index;
357 #define _(N, i, n, s) \
358 u32 busy_##n##_ports; \
359 u32 * busy_##n##_ports_per_thread; \
360 u32 busy_##n##_port_refcounts[65535];
379 /* backend IP address */
381 /* backend port number */
383 /* probability of the backend to be randomly matched */
386 /* backend FIB table */
389 } nat44_lb_addr_port_t;
393 /* twice-nat disabled */
395 /* twice-nat enabled */
397 /* twice-nat only when src IP equals dst IP after translation */
403 /* no load-balancing */
407 /* load-balancing with affinity */
413 /* prefered pool address */
414 ip4_address_t pool_addr;
415 /* local IP address */
416 ip4_address_t local_addr;
417 /* external IP address */
418 ip4_address_t external_addr;
424 twice_nat_type_t twice_nat;
425 /* local FIB table */
429 nat_protocol_t proto;
430 /* 0 = disabled, otherwise client IP affinity sticky time in seconds */
432 /* worker threads used by backends/local host */
434 /* opaque string tag */
436 /* backends for load-balancing mode */
437 nat44_lb_addr_port_t *locals;
438 /* affinity per service lis */
439 u32 affinity_per_service_list_head_index;
442 } snat_static_mapping_t;
452 ip4_address_t l_addr;
453 ip4_address_t pool_addr;
458 nat_protocol_t proto;
466 } snat_static_map_resolve_t;
471 snat_session_t *sessions;
473 /* Pool of doubly-linked list elements */
474 dlist_elt_t *list_pool;
476 /* LRU session list - head is stale, tail is fresh */
477 dlist_elt_t *lru_pool;
478 u32 tcp_trans_lru_head_index;
479 u32 tcp_estab_lru_head_index;
480 u32 udp_lru_head_index;
481 u32 icmp_lru_head_index;
482 u32 unk_proto_lru_head_index;
484 /* NAT thread index */
485 u32 snat_thread_index;
487 /* real thread index */
490 per_vrf_sessions_t *per_vrf_sessions_vec;
492 } snat_main_per_thread_data_t;
496 u32 nat44_ed_get_in2out_worker_index (vlib_buffer_t *b, ip4_header_t *ip,
497 u32 rx_fib_index, u8 is_output);
498 u32 nat44_ed_get_out2in_worker_index (vlib_buffer_t *b, ip4_header_t *ip,
499 u32 rx_fib_index, u8 is_output);
501 /* Return worker thread index for given packet */
502 /* NAT address and port allocation function */
503 typedef int (nat_alloc_out_addr_and_port_function_t) (snat_address_t *
507 nat_protocol_t proto,
508 ip4_address_t * addr,
511 u32 snat_thread_index);
513 typedef struct snat_main_s
515 /* Thread settings */
517 u32 first_worker_index;
521 /* Per thread data */
522 snat_main_per_thread_data_t *per_thread_data;
524 /* Find a static mapping by local */
525 clib_bihash_8_8_t static_mapping_by_local;
527 /* Find a static mapping by external */
528 clib_bihash_8_8_t static_mapping_by_external;
530 /* Static mapping pool */
531 snat_static_mapping_t *static_mappings;
533 /* Endpoint independent lookup tables */
534 clib_bihash_8_8_t in2out;
535 clib_bihash_8_8_t out2in;
537 /* Endpoint dependent lookup table */
538 clib_bihash_16_8_t flow_hash;
541 snat_interface_t *interfaces;
542 snat_interface_t *output_feature_interfaces;
544 /* Vector of outside addresses */
545 snat_address_t *addresses;
546 /* Address and port allocation function */
547 nat_alloc_out_addr_and_port_function_t *alloc_addr_and_port;
548 /* Address and port allocation type */
549 nat_addr_and_port_alloc_alg_t addr_and_port_alloc_alg;
550 /* Port set parameters (MAP-E) */
554 /* Port range parameters */
561 /* vector of outside fibs */
562 nat_outside_fib_t *outside_fibs;
564 /* Vector of twice NAT addresses for external hosts */
565 snat_address_t *twice_nat_addresses;
567 /* sw_if_indices whose intfc addresses should be auto-added */
568 u32 *auto_add_sw_if_indices;
569 u32 *auto_add_sw_if_indices_twice_nat;
571 /* vector of interface address static mappings to resolve. */
572 snat_static_map_resolve_t *to_resolve;
574 /* Randomize port allocation order */
577 /* Worker handoff frame-queue index */
579 u32 fq_in2out_output_index;
582 u32 out2in_node_index;
583 u32 in2out_node_index;
584 u32 in2out_output_node_index;
586 nat44_config_t rconfig;
587 //nat44_config_t cconfig;
589 /* If forwarding is enabled */
590 u8 forwarding_enabled;
592 /* static mapping config */
593 u8 static_mapping_only;
594 u8 static_mapping_connection_tracking;
596 /* Is translation memory size calculated or user defined */
597 u8 translation_memory_size_set;
599 u32 translation_buckets;
600 u32 max_translations_per_thread;
601 u32 *max_translations_per_fib;
604 u32 outside_fib_index;
606 u32 inside_fib_index;
608 nat_timeouts_t timeouts;
610 /* TCP MSS clamping */
614 vlib_simple_counter_main_t total_sessions;
615 u32 max_cfg_sessions_gauge; /* Index of max configured sessions gauge in
618 #define _(x) vlib_simple_counter_main_t x;
647 vlib_simple_counter_main_t hairpinning;
651 /* API message ID base */
655 vlib_log_class_t log_class;
660 api_main_t *api_main;
661 ip4_main_t *ip4_main;
662 ip_lookup_main_t *ip4_lookup_main;
664 fib_source_t fib_src_hi;
665 fib_source_t fib_src_low;
667 /* pat - dynamic mapping enabled or conneciton tracking */
670 /* number of worker handoff frame queue elements */
671 u32 frame_queue_nelts;
673 /* nat44 plugin enabled */
676 vnet_main_t *vnet_main;
684 } nat44_is_idle_session_ctx_t;
688 u32 cached_sw_if_index;
689 uword *cached_presence_by_ip4_address;
692 extern snat_main_t snat_main;
694 // nat pre ed next_node feature classification
695 extern vlib_node_registration_t nat_default_node;
696 extern vlib_node_registration_t nat_pre_in2out_node;
697 extern vlib_node_registration_t nat_pre_out2in_node;
699 extern vlib_node_registration_t snat_in2out_node;
700 extern vlib_node_registration_t snat_in2out_output_node;
701 extern vlib_node_registration_t snat_out2in_node;
702 extern vlib_node_registration_t snat_in2out_worker_handoff_node;
703 extern vlib_node_registration_t snat_in2out_output_worker_handoff_node;
704 extern vlib_node_registration_t snat_out2in_worker_handoff_node;
705 extern vlib_node_registration_t nat44_ed_in2out_node;
706 extern vlib_node_registration_t nat44_ed_in2out_output_node;
707 extern vlib_node_registration_t nat44_ed_out2in_node;
709 extern fib_source_t nat_fib_src_hi;
710 extern fib_source_t nat_fib_src_low;
712 /* format functions */
713 format_function_t format_snat_static_mapping;
714 format_function_t format_snat_static_map_to_resolve;
715 format_function_t format_snat_session;
716 format_function_t format_snat_key;
717 format_function_t format_static_mapping_key;
718 format_function_t format_nat_protocol;
719 format_function_t format_nat_addr_and_port_alloc_alg;
720 /* unformat functions */
721 unformat_function_t unformat_nat_protocol;
723 /** \brief Check if SNAT session is created from static mapping.
724 @param s SNAT session
725 @return 1 if SNAT session is created from static mapping otherwise 0
727 #define snat_is_session_static(s) (s->flags & SNAT_SESSION_FLAG_STATIC_MAPPING)
729 /** \brief Check if SNAT session for unknown protocol.
730 @param s SNAT session
731 @return 1 if SNAT session for unknown protocol otherwise 0
733 #define snat_is_unk_proto_session(s) (s->flags & SNAT_SESSION_FLAG_UNKNOWN_PROTO)
735 /** \brief Check if NAT session is twice NAT.
737 @return 1 if NAT session is twice NAT
739 #define is_twice_nat_session(s) (s->flags & SNAT_SESSION_FLAG_TWICE_NAT)
741 /** \brief Check if NAT session is load-balancing.
743 @return 1 if NAT session is load-balancing
745 #define is_lb_session(s) (s->flags & SNAT_SESSION_FLAG_LOAD_BALANCING)
747 /** \brief Check if NAT session is forwarding bypass.
749 @return 1 if NAT session is load-balancing
751 #define is_fwd_bypass_session(s) (s->flags & SNAT_SESSION_FLAG_FWD_BYPASS)
753 /** \brief Check if NAT session is endpoint dependent.
755 @return 1 if NAT session is endpoint dependent
757 #define is_ed_session(s) (s->flags & SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT)
759 /** \brief Check if NAT session has affinity record.
761 @return 1 if NAT session has affinity record
763 #define is_affinity_sessions(s) (s->flags & SNAT_SESSION_FLAG_AFFINITY)
765 /** \brief Check if exact pool address should be used.
766 @param s SNAT session
767 @return 1 if exact pool address or 0
769 #define is_exact_address_session(s) (s->flags & SNAT_SESSION_FLAG_EXACT_ADDRESS)
771 /** \brief Check if NAT interface is inside.
772 @param i NAT interface
773 @return 1 if inside interface
775 #define nat_interface_is_inside(i) i->flags & NAT_INTERFACE_FLAG_IS_INSIDE
777 /** \brief Check if NAT interface is outside.
778 @param i NAT interface
779 @return 1 if outside interface
781 #define nat_interface_is_outside(i) i->flags & NAT_INTERFACE_FLAG_IS_OUTSIDE
783 /** \brief Check if NAT44 endpoint-dependent TCP session is closed.
785 @return 1 if session is closed
787 #define nat44_is_ses_closed(s) s->state == 0xf
789 /** \brief Check if NAT static mapping is address only (1:1NAT).
790 @param sm NAT static mapping
791 @return 1 if 1:1NAT, 0 if 1:1NAPT
793 #define is_addr_only_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_ADDR_ONLY)
795 /** \brief Check if NAT static mapping match only out2in direction.
796 @param sm NAT static mapping
797 @return 1 if rule match only out2in direction
799 #define is_out2in_only_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY)
801 /** \brief Check if NAT static mapping is identity NAT.
802 @param sm NAT static mapping
803 @return 1 if identity NAT
805 #define is_identity_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT)
807 /** \brief Check if NAT static mapping is load-balancing.
808 @param sm NAT static mapping
809 @return 1 if load-balancing
811 #define is_lb_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_LB)
813 /** \brief Check if exact pool address should be used.
814 @param s SNAT session
815 @return 1 if exact pool address or 0
817 #define is_exact_address(s) (s->flags & NAT_STATIC_MAPPING_FLAG_EXACT_ADDRESS)
819 /** \brief Check if client initiating TCP connection (received SYN from client)
821 @return 1 if client initiating TCP connection
824 tcp_flags_is_init (u8 f)
826 return (f & TCP_FLAG_SYN) && !(f & TCP_FLAG_ACK);
830 #define nat_log_err(...) \
831 vlib_log(VLIB_LOG_LEVEL_ERR, snat_main.log_class, __VA_ARGS__)
832 #define nat_log_warn(...) \
833 vlib_log(VLIB_LOG_LEVEL_WARNING, snat_main.log_class, __VA_ARGS__)
834 #define nat_log_notice(...) \
835 vlib_log(VLIB_LOG_LEVEL_NOTICE, snat_main.log_class, __VA_ARGS__)
836 #define nat_log_info(...) \
837 vlib_log(VLIB_LOG_LEVEL_INFO, snat_main.log_class, __VA_ARGS__)
838 #define nat_log_debug(...)\
839 vlib_log(VLIB_LOG_LEVEL_DEBUG, snat_main.log_class, __VA_ARGS__)
842 * @brief Enable NAT44 plugin
844 * @param c nat44_config_t
846 * @return 0 on success, non-zero value otherwise
848 int nat44_plugin_enable (nat44_config_t c);
851 * @brief Disable NAT44 plugin
853 * @return 0 on success, non-zero value otherwise
855 int nat44_plugin_disable ();
858 * @brief Add external address to NAT44 pool
860 * @param sm snat global configuration data
861 * @param addr IPv4 address
862 * @param vrf_id VRF id of tenant, ~0 means independent of VRF
863 * @param twice_nat 1 if twice NAT address
865 * @return 0 on success, non-zero value otherwise
867 int snat_add_address (snat_main_t * sm, ip4_address_t * addr, u32 vrf_id,
871 * @brief Delete external address from NAT44 pool
873 * @param sm snat global configuration data
874 * @param addr IPv4 address
875 * @param delete_sm 1 if delete static mapping using address
876 * @param twice_nat 1 if twice NAT address
878 * @return 0 on success, non-zero value otherwise
880 int snat_del_address (snat_main_t * sm, ip4_address_t addr, u8 delete_sm,
884 * @brief Add/delete external address to FIB DPO (out2in DPO mode)
886 * @param addr IPv4 address
887 * @param is_add 1 = add, 0 = delete
889 * @return 0 on success, non-zero value otherwise
891 void nat44_add_del_address_dpo (ip4_address_t addr, u8 is_add);
894 * @brief Add/delete NAT44 static mapping
896 * @param l_addr local IPv4 address
897 * @param e_addr external IPv4 address
898 * @param l_port local port number
899 * @param e_port external port number
900 * @param vrf_id local VRF ID
901 * @param addr_only 1 = 1:1NAT, 0 = 1:1NAPT
902 * @param sw_if_index use interface address as external IPv4 address
903 * @param proto L4 protocol
904 * @param is_add 1 = add, 0 = delete
905 * @param twice_nat twice-nat mode
906 * @param out2in_only if 1 rule match only out2in direction
907 * @param tag opaque string tag
908 * @param identity_nat identity NAT
909 * @param pool_addr pool IPv4 address
910 * @param exact 1 = exact pool address
912 * @return 0 on success, non-zero value otherwise
914 int snat_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
915 u16 l_port, u16 e_port, u32 vrf_id,
916 int addr_only, u32 sw_if_index,
917 nat_protocol_t proto, int is_add,
918 twice_nat_type_t twice_nat, u8 out2in_only,
919 u8 * tag, u8 identity_nat,
920 ip4_address_t pool_addr, int exact);
923 * @brief Add/delete static mapping with load-balancing (multiple backends)
925 * @param e_addr external IPv4 address
926 * @param e_port external port number
927 * @param proto L4 protocol
928 * @param locals list of local backends
929 * @param is_add 1 = add, 0 = delete
930 * @param twice_nat twice-nat mode
931 * @param out2in_only if 1 rule match only out2in direction
932 * @param tag opaque string tag
933 * @param affinity 0 = disabled, otherwise client IP affinity sticky time
935 * @return 0 on success, non-zero value otherwise
937 int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
938 nat_protocol_t proto,
939 nat44_lb_addr_port_t * locals, u8 is_add,
940 twice_nat_type_t twice_nat,
941 u8 out2in_only, u8 * tag, u32 affinity);
943 int nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port,
944 ip4_address_t l_addr, u16 l_port,
945 nat_protocol_t proto, u32 vrf_id,
946 u8 probability, u8 is_add);
948 clib_error_t *nat44_api_hookup (vlib_main_t * vm);
951 * @brief Set NAT plugin workers
953 * @param bitmap NAT workers bitmap
955 * @return 0 on success, non-zero value otherwise
957 int snat_set_workers (uword * bitmap);
959 int nat44_ed_add_interface (u32 sw_if_index, u8 is_inside);
960 int nat44_ed_del_interface (u32 sw_if_index, u8 is_inside);
961 int nat44_ed_add_output_interface (u32 sw_if_index);
962 int nat44_ed_del_output_interface (u32 sw_if_index);
965 * @brief Add/delete NAT44 pool address from specific interface
967 * @param sw_if_index software index of the interface
968 * @param is_del 1 = delete, 0 = add
969 * @param twice_nat 1 = twice NAT address for external hosts
971 * @return 0 on success, non-zero value otherwise
973 int snat_add_interface_address (snat_main_t * sm, u32 sw_if_index, int is_del,
977 * @brief Delete NAT44 endpoint-dependent session
979 * @param sm snat global configuration data
980 * @param addr IPv4 address
981 * @param port L4 port number
982 * @param proto L4 protocol
983 * @param vrf_id VRF ID
984 * @param is_in 1 = inside network address and port pair, 0 = outside
986 * @return 0 on success, non-zero value otherwise
988 int nat44_del_ed_session (snat_main_t * sm, ip4_address_t * addr, u16 port,
989 ip4_address_t * eh_addr, u16 eh_port, u8 proto,
990 u32 vrf_id, int is_in);
993 * @brief Free NAT44 session data (lookup keys, external address port)
995 * @param sm snat global configuration data
996 * @param s NAT session
997 * @param thread_index thread index
998 * @param is_ha is HA event
1000 void nat_free_session_data (snat_main_t * sm, snat_session_t * s,
1001 u32 thread_index, u8 is_ha);
1004 * @brief Set NAT44 session limit (session limit, vrf id)
1006 * @param session_limit Session limit
1007 * @param vrf_id VRF id
1008 * @return 0 on success, non-zero value otherwise
1010 int nat44_set_session_limit (u32 session_limit, u32 vrf_id);
1013 * @brief Update NAT44 session limit flushing all data (session limit, vrf id)
1015 * @param session_limit Session limit
1016 * @param vrf_id VRF id
1017 * @return 0 on success, non-zero value otherwise
1019 int nat44_update_session_limit (u32 session_limit, u32 vrf_id);
1022 * @brief Free outside address and port pair
1024 * @param addresses vector of outside addresses
1025 * @param thread_index thread index
1026 * @param key address, port and protocol
1029 snat_free_outside_address_and_port (snat_address_t * addresses,
1031 ip4_address_t * addr,
1032 u16 port, nat_protocol_t protocol);
1034 void expire_per_vrf_sessions (u32 fib_index);
1037 * @brief Match NAT44 static mapping.
1039 * @param key address and port to match
1040 * @param addr external/local address of the matched mapping
1041 * @param port port of the matched mapping
1042 * @param fib_index fib index of the matched mapping
1043 * @param by_external if 0 match by local address otherwise match by external
1045 * @param is_addr_only 1 if matched mapping is address only
1046 * @param twice_nat matched mapping is twice NAT type
1047 * @param lb 1 if matched mapping is load-balanced
1048 * @param ext_host_addr external host address
1049 * @param is_identity_nat 1 if indentity mapping
1050 * @param out if !=0 set to pointer of the mapping structure
1052 * @returns 0 if match found otherwise 1.
1054 int snat_static_mapping_match (
1055 vlib_main_t *vm, snat_main_t *sm, ip4_address_t match_addr, u16 match_port,
1056 u32 match_fib_index, nat_protocol_t match_protocol,
1057 ip4_address_t *mapping_addr, u16 *mapping_port, u32 *mapping_fib_index,
1058 u8 by_external, u8 *is_addr_only, twice_nat_type_t *twice_nat,
1059 lb_nat_type_t *lb, ip4_address_t *ext_host_addr, u8 *is_identity_nat,
1060 snat_static_mapping_t **out);
1063 * @brief Add/del NAT address to FIB.
1065 * Add the external NAT address to the FIB as receive entries. This ensures
1066 * that VPP will reply to ARP for this address and we don't need to enable
1067 * proxy ARP on the outside interface.
1069 * @param addr IPv4 address
1070 * @param plen address prefix length
1071 * @param sw_if_index software index of the outside interface
1072 * @param is_add 0 = delete, 1 = add.
1074 void snat_add_del_addr_to_fib (ip4_address_t * addr,
1075 u8 p_len, u32 sw_if_index, int is_add);
1079 nat_ha_sadd_ed_cb (ip4_address_t * in_addr, u16 in_port,
1080 ip4_address_t * out_addr, u16 out_port,
1081 ip4_address_t * eh_addr, u16 eh_port,
1082 ip4_address_t * ehn_addr, u16 ehn_port, u8 proto,
1083 u32 fib_index, u16 flags, u32 thread_index);
1086 nat_ha_sdel_ed_cb (ip4_address_t * out_addr, u16 out_port,
1087 ip4_address_t * eh_addr, u16 eh_port, u8 proto,
1088 u32 fib_index, u32 ti);
1091 nat_ha_sref_ed_cb (ip4_address_t * out_addr, u16 out_port,
1092 ip4_address_t * eh_addr, u16 eh_port, u8 proto,
1093 u32 fib_index, u32 total_pkts, u64 total_bytes,
1097 int nat_set_outside_address_and_port (snat_address_t *addresses,
1098 u32 thread_index, ip4_address_t addr,
1099 u16 port, nat_protocol_t protocol);
1102 * Why is this here? Because we don't need to touch this layer to
1103 * simply reply to an icmp. We need to change id to a unique
1104 * value to NAT an echo request/reply.
1111 } icmp_echo_header_t;
1115 u16 src_port, dst_port;
1118 u32 get_thread_idx_by_port (u16 e_port);
1120 u8 *format_static_mapping_kvp (u8 *s, va_list *args);
1122 u8 *format_session_kvp (u8 *s, va_list *args);
1124 u32 nat_calc_bihash_buckets (u32 n_elts);
1126 void nat44_addresses_free (snat_address_t **addresses);
1128 void nat44_ed_sessions_clear ();
1130 int nat44_ed_set_frame_queue_nelts (u32 frame_queue_nelts);
1134 NAT_ED_TRNSL_ERR_SUCCESS = 0,
1135 NAT_ED_TRNSL_ERR_TRANSLATION_FAILED = 1,
1136 NAT_ED_TRNSL_ERR_FLOW_MISMATCH = 2,
1137 NAT_ED_TRNSL_ERR_PACKET_TRUNCATED = 3,
1138 NAT_ED_TRNSL_ERR_INNER_IP_CORRUPT = 4,
1139 NAT_ED_TRNSL_ERR_INVALID_CSUM = 5,
1140 } nat_translation_error_e;
1142 nat_translation_error_e nat_6t_flow_buf_translate_i2o (
1143 vlib_main_t *vm, snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip,
1144 nat_6t_flow_t *f, nat_protocol_t proto, int is_output_feature);
1146 nat_translation_error_e nat_6t_flow_buf_translate_o2i (
1147 vlib_main_t *vm, snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip,
1148 nat_6t_flow_t *f, nat_protocol_t proto, int is_output_feature);
1150 void nat_6t_l3_l4_csum_calc (nat_6t_flow_t *f);
1152 format_function_t format_nat_ed_translation_error;
1153 format_function_t format_nat_6t_flow;
1154 format_function_t format_ed_session_kvp;
1156 #endif /* __included_nat44_ed_h__ */
1158 * fd.io coding-style-patch-verification: ON
1161 * eval: (c-set-style "gnu")