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.
16 #ifndef __included_nat44_ed_h__
17 #define __included_nat44_ed_h__
19 #include <vnet/vnet.h>
20 #include <vnet/ip/ip.h>
21 #include <vnet/ethernet/ethernet.h>
22 #include <vnet/ip/icmp46_packet.h>
23 #include <vnet/api_errno.h>
24 #include <vnet/fib/fib_source.h>
25 #include <vppinfra/elog.h>
26 #include <vppinfra/bihash_8_8.h>
27 #include <vppinfra/bihash_16_8.h>
28 #include <vppinfra/hash.h>
29 #include <vppinfra/dlist.h>
30 #include <vppinfra/error.h>
31 #include <vlibapi/api.h>
33 #include <nat/lib/lib.h>
34 #include <nat/lib/inlines.h>
36 /* default number of worker handoff frame queue elements */
37 #define NAT_FQ_NELTS_DEFAULT 64
39 /* number of attempts to get a port for ED overloading algorithm, if rolling
40 * a dice this many times doesn't produce a free port, it's treated
41 * as if there were no free ports available to conserve resources */
42 #define ED_PORT_ALLOC_ATTEMPTS (10)
44 /* NAT buffer flags */
45 #define SNAT_FLAG_HAIRPINNING (1 << 0)
47 /* NAT44 API Configuration flags */
48 #define foreach_nat44_config_flag \
49 _ (0x00, IS_ENDPOINT_INDEPENDENT) \
50 _ (0x01, IS_ENDPOINT_DEPENDENT) \
51 _ (0x02, IS_STATIC_MAPPING_ONLY) \
52 _ (0x04, IS_CONNECTION_TRACKING)
54 typedef enum nat44_config_flags_t_
56 #define _(n,f) NAT44_API_##f = n,
57 foreach_nat44_config_flag
59 } nat44_config_flags_t;
72 NAT_NEXT_IN2OUT_ED_FAST_PATH,
73 NAT_NEXT_IN2OUT_ED_SLOW_PATH,
74 NAT_NEXT_IN2OUT_ED_OUTPUT_FAST_PATH,
75 NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH,
76 NAT_NEXT_OUT2IN_ED_FAST_PATH,
77 NAT_NEXT_OUT2IN_ED_SLOW_PATH,
78 NAT_NEXT_IN2OUT_CLASSIFY,
79 NAT_NEXT_OUT2IN_CLASSIFY,
89 #define foreach_nat_in2out_ed_error \
90 _ (UNSUPPORTED_PROTOCOL, "unsupported protocol") \
91 _ (OUT_OF_PORTS, "out of ports") \
92 _ (BAD_ICMP_TYPE, "unsupported ICMP type") \
93 _ (MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
94 _ (NON_SYN, "non-SYN packet try to create session") \
95 _ (TRNSL_FAILED, "couldn't translate packet")
99 #define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
100 foreach_nat_in2out_ed_error
102 NAT_IN2OUT_ED_N_ERROR,
103 } nat_in2out_ed_error_t;
105 #define foreach_nat_out2in_ed_error \
106 _ (UNSUPPORTED_PROTOCOL, "unsupported protocol") \
107 _ (OUT_OF_PORTS, "out of ports") \
108 _ (BAD_ICMP_TYPE, "unsupported ICMP type") \
109 _ (NO_TRANSLATION, "no translation") \
110 _ (MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
111 _ (NON_SYN, "non-SYN packet try to create session") \
112 _ (TCP_CLOSED, "drops due to TCP in transitory timeout") \
113 _ (HASH_ADD_FAILED, "hash table add failed") \
114 _ (TRNSL_FAILED, "couldn't translate packet")
118 #define _(sym,str) NAT_OUT2IN_ED_ERROR_##sym,
119 foreach_nat_out2in_ed_error
121 NAT_OUT2IN_ED_N_ERROR,
122 } nat_out2in_ed_error_t;
126 NAT44_ED_TCP_FLAG_FIN = 0,
127 NAT44_ED_TCP_FLAG_SYN,
128 NAT44_ED_TCP_FLAG_RST,
129 NAT44_ED_TCP_FLAG_ACK,
131 } nat44_ed_tcp_flag_e;
135 NAT44_ED_DIR_I2O = 0,
140 /* Endpoint dependent TCP session state */
143 NAT44_ED_TCP_STATE_CLOSED = 0,
144 NAT44_ED_TCP_STATE_ESTABLISHED,
145 NAT44_ED_TCP_STATE_CLOSING,
146 NAT44_ED_TCP_N_STATE,
147 } nat44_ed_tcp_state_e;
149 format_function_t format_ed_session_kvp;
150 format_function_t format_snat_session;
151 format_function_t format_snat_static_mapping;
152 format_function_t format_snat_static_map_to_resolve;
153 format_function_t format_nat_ed_translation_error;
154 format_function_t format_nat_6t_flow;
155 format_function_t format_nat_6t;
156 format_function_t format_nat44_ed_tcp_state;
159 #define SNAT_SESSION_FLAG_STATIC_MAPPING (1 << 0)
160 #define SNAT_SESSION_FLAG_LOAD_BALANCING (1 << 2)
161 #define SNAT_SESSION_FLAG_TWICE_NAT (1 << 3)
162 #define SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT (1 << 4)
163 #define SNAT_SESSION_FLAG_FWD_BYPASS (1 << 5)
164 #define SNAT_SESSION_FLAG_AFFINITY (1 << 6)
165 #define SNAT_SESSION_FLAG_EXACT_ADDRESS (1 << 7)
166 #define SNAT_SESSION_FLAG_HAIRPINNING (1 << 8)
168 /* NAT interface flags */
169 #define NAT_INTERFACE_FLAG_IS_INSIDE 1
170 #define NAT_INTERFACE_FLAG_IS_OUTSIDE 2
172 /* Static mapping flags */
173 #define NAT_SM_FLAG_SELF_TWICE_NAT (1 << 1)
174 #define NAT_SM_FLAG_TWICE_NAT (1 << 2)
175 #define NAT_SM_FLAG_IDENTITY_NAT (1 << 3)
176 #define NAT_SM_FLAG_ADDR_ONLY (1 << 4)
177 #define NAT_SM_FLAG_EXACT_ADDRESS (1 << 5)
178 #define NAT_SM_FLAG_OUT2IN_ONLY (1 << 6)
179 #define NAT_SM_FLAG_LB (1 << 7)
180 #define NAT_SM_FLAG_SWITCH_ADDRESS (1 << 8)
182 typedef CLIB_PACKED(struct
184 // number of sessions in this vrf
190 // is this vrf expired
192 }) per_vrf_sessions_t;
198 ip4_address_t saddr, daddr;
199 u16 sport; // ICMP id for ICMP case
208 STATIC_ASSERT_SIZEOF (nat_6t_t, 2 * sizeof (u64));
212 #define NAT_FLOW_OP_SADDR_REWRITE (1 << 1)
213 #define NAT_FLOW_OP_SPORT_REWRITE (1 << 2)
214 #define NAT_FLOW_OP_DADDR_REWRITE (1 << 3)
215 #define NAT_FLOW_OP_DPORT_REWRITE (1 << 4)
216 #define NAT_FLOW_OP_ICMP_ID_REWRITE (1 << 5)
217 #define NAT_FLOW_OP_TXFIB_REWRITE (1 << 6)
222 ip4_address_t saddr, daddr;
233 void nat44_ed_forwarding_enable_disable (u8 is_enable);
236 nat_6t_flow_saddr_rewrite_set (nat_6t_flow_t *f, u32 saddr)
238 f->ops |= NAT_FLOW_OP_SADDR_REWRITE;
239 f->rewrite.saddr.as_u32 = saddr;
243 nat_6t_flow_daddr_rewrite_set (nat_6t_flow_t *f, u32 daddr)
245 f->ops |= NAT_FLOW_OP_DADDR_REWRITE;
246 f->rewrite.daddr.as_u32 = daddr;
250 nat_6t_flow_sport_rewrite_set (nat_6t_flow_t *f, u32 sport)
252 f->ops |= NAT_FLOW_OP_SPORT_REWRITE;
253 f->rewrite.sport = sport;
257 nat_6t_flow_dport_rewrite_set (nat_6t_flow_t *f, u32 dport)
259 f->ops |= NAT_FLOW_OP_DPORT_REWRITE;
260 f->rewrite.dport = dport;
264 nat_6t_flow_txfib_rewrite_set (nat_6t_flow_t *f, u32 tx_fib_index)
266 f->ops |= NAT_FLOW_OP_TXFIB_REWRITE;
267 f->rewrite.fib_index = tx_fib_index;
271 nat_6t_flow_icmp_id_rewrite_set (nat_6t_flow_t *f, u16 id)
273 f->ops |= NAT_FLOW_OP_ICMP_ID_REWRITE;
274 f->rewrite.icmp_id = id;
277 typedef CLIB_PACKED(struct
279 /* Outside network tuple */
287 /* Inside network tuple */
303 /* head of LRU list in which this session is tracked */
305 /* index in global LRU list */
309 /* Last heard timer */
312 /* Last HA refresh */
313 f64 ha_last_refreshed;
319 /* External host address and port */
320 ip4_address_t ext_host_addr;
323 /* External host address and port after translation */
324 ip4_address_t ext_host_nat_addr;
325 u16 ext_host_nat_port;
327 /* TCP session state */
328 u8 tcp_flags[NAT44_ED_N_DIR];
329 nat44_ed_tcp_state_e tcp_state;
331 /* per vrf sessions index */
332 u32 per_vrf_sessions_index;
348 /* backend IP address */
350 /* backend port number */
352 /* probability of the backend to be randomly matched */
355 /* backend FIB table */
358 } nat44_lb_addr_port_t;
362 /* twice-nat disabled */
364 /* twice-nat enabled */
366 /* twice-nat only when src IP equals dst IP after translation */
372 /* no load-balancing */
376 /* load-balancing with affinity */
382 /* preferred pool address */
383 ip4_address_t pool_addr;
384 /* local IP address */
385 ip4_address_t local_addr;
386 /* external IP address */
387 ip4_address_t external_addr;
392 /* local FIB table */
397 /* 0 = disabled, otherwise client IP affinity sticky time in seconds */
399 /* worker threads used by backends/local host */
401 /* opaque string tag */
403 /* backends for load-balancing mode */
404 nat44_lb_addr_port_t *locals;
405 /* affinity per service lis */
406 u32 affinity_per_service_list_head_index;
409 } snat_static_mapping_t;
420 ip4_address_t l_addr;
421 ip4_address_t pool_addr;
429 } snat_static_mapping_resolve_t;
436 } snat_address_resolve_t;
443 } snat_fib_entry_reg_t;
448 snat_session_t *sessions;
450 /* Pool of doubly-linked list elements */
451 dlist_elt_t *list_pool;
453 /* LRU session list - head is stale, tail is fresh */
454 dlist_elt_t *lru_pool;
455 u32 tcp_trans_lru_head_index;
456 u32 tcp_estab_lru_head_index;
457 u32 udp_lru_head_index;
458 u32 icmp_lru_head_index;
459 u32 unk_proto_lru_head_index;
461 /* NAT thread index */
462 u32 snat_thread_index;
464 /* real thread index */
467 per_vrf_sessions_t *per_vrf_sessions_vec;
469 } snat_main_per_thread_data_t;
473 u32 nat44_ed_get_in2out_worker_index (vlib_buffer_t *b, ip4_header_t *ip,
474 u32 rx_fib_index, u8 is_output);
475 u32 nat44_ed_get_out2in_worker_index (vlib_buffer_t *b, ip4_header_t *ip,
476 u32 rx_fib_index, u8 is_output);
478 /* Return worker thread index for given packet */
479 /* NAT address and port allocation function */
480 typedef int (nat_alloc_out_addr_and_port_function_t) (
481 snat_address_t *addresses, u32 fib_index, u32 thread_index,
482 ip_protocol_t proto, ip4_address_t *addr, u16 *port, u16 port_per_thread,
483 u32 snat_thread_index);
485 typedef struct nat_fib_s
491 typedef struct vrf_route_s
497 typedef struct vrf_table_s
504 typedef struct snat_main_s
506 /* Thread settings */
508 u32 first_worker_index;
512 /* Per thread data */
513 snat_main_per_thread_data_t *per_thread_data;
515 /* Static mapping pool */
516 snat_static_mapping_t *static_mappings;
518 /* Endpoint independent lookup tables */
519 clib_bihash_8_8_t in2out;
520 clib_bihash_8_8_t out2in;
522 /* Endpoint dependent lookup table */
523 clib_bihash_16_8_t flow_hash;
529 u32 inside_fib_index;
532 u32 outside_fib_index;
534 // vector of outside fibs
535 nat_fib_t *outside_fibs;
537 // VRF routing table for dynamic sessions
538 vrf_table_t *vrf_tables;
541 snat_interface_t *interfaces;
542 snat_interface_t *output_feature_interfaces;
543 // broken api backward compatibility
544 snat_interface_t *output_feature_dummy_interfaces;
546 /* Vector of outside addresses */
547 snat_address_t *addresses;
548 /* Vector of twice NAT addresses for external hosts */
549 snat_address_t *twice_nat_addresses;
551 /* first interface address should be auto-added */
552 snat_address_resolve_t *addr_to_resolve;
554 /* vector of fib entries */
555 snat_fib_entry_reg_t *fib_entry_reg;
557 /* vector of interface address static mappings to resolve. */
558 snat_static_mapping_resolve_t *sm_to_resolve;
560 /* Randomize port allocation order */
563 /* Worker handoff frame-queue index */
565 u32 fq_in2out_output_index;
568 nat44_config_t rconfig;
570 /* If forwarding is enabled */
571 u8 forwarding_enabled;
573 /* Is translation memory size calculated or user defined */
574 u8 translation_memory_size_set;
576 u32 translation_buckets;
577 u32 max_translations_per_thread;
578 u32 *max_translations_per_fib;
580 nat_timeouts_t timeouts;
582 /* TCP MSS clamping */
586 vlib_simple_counter_main_t total_sessions;
587 u32 max_cfg_sessions_gauge; /* Index of max configured sessions gauge in
590 #define _(x) vlib_simple_counter_main_t x;
619 vlib_simple_counter_main_t hairpinning;
623 /* API message ID base */
627 vlib_log_class_t log_class;
632 ip4_main_t *ip4_main;
634 fib_source_t fib_src_hi;
635 fib_source_t fib_src_low;
637 /* number of worker handoff frame queue elements */
638 u32 frame_queue_nelts;
640 /* nat44 plugin enabled */
643 /* TCP session state machine table:
644 * first dimension is possible states
645 * second dimension is direction (in2out/out2in)
646 * third dimension is TCP flag (SYN, RST, FIN)
648 * value is next state to change to
650 nat44_ed_tcp_state_e tcp_state_change_table[NAT44_ED_TCP_N_STATE]
652 [NAT44_ED_TCP_N_FLAG];
659 } nat44_is_idle_session_ctx_t;
663 u32 cached_sw_if_index;
664 uword *cached_presence_by_ip4_address;
668 * Why is this here? Because we don't need to touch this layer to
669 * simply reply to an icmp. We need to change id to a unique
670 * value to NAT an echo request/reply.
673 extern snat_main_t snat_main;
675 extern vlib_node_registration_t nat_default_node;
676 extern vlib_node_registration_t nat_pre_in2out_node;
677 extern vlib_node_registration_t nat_pre_out2in_node;
679 extern vlib_node_registration_t nat44_ed_in2out_node;
680 extern vlib_node_registration_t nat44_ed_in2out_output_node;
681 extern vlib_node_registration_t nat44_ed_out2in_node;
683 extern vlib_node_registration_t snat_in2out_worker_handoff_node;
684 extern vlib_node_registration_t snat_in2out_output_worker_handoff_node;
685 extern vlib_node_registration_t snat_out2in_worker_handoff_node;
687 /** \brief Check if SNAT session is created from static mapping.
688 @param s SNAT session
689 @return true if SNAT session is created from static mapping otherwise 0
692 nat44_ed_is_session_static (snat_session_t *s)
694 return s->flags & SNAT_SESSION_FLAG_STATIC_MAPPING;
697 /** \brief Check if NAT session is twice NAT.
699 @return true if NAT session is twice NAT
702 nat44_ed_is_twice_nat_session (snat_session_t *s)
704 return s->flags & SNAT_SESSION_FLAG_TWICE_NAT;
707 /** \brief Check if NAT session is load-balancing.
709 @return true if NAT session is load-balancing
712 nat44_ed_is_lb_session (snat_session_t *s)
714 return s->flags & SNAT_SESSION_FLAG_LOAD_BALANCING;
717 /** \brief Check if NAT session is forwarding bypass.
719 @return true if NAT session is load-balancing
722 na44_ed_is_fwd_bypass_session (snat_session_t *s)
724 return s->flags & SNAT_SESSION_FLAG_FWD_BYPASS;
727 /** \brief Check if NAT session has affinity record.
729 @return true if NAT session has affinity record
732 nat44_ed_is_affinity_session (snat_session_t *s)
734 return s->flags & SNAT_SESSION_FLAG_AFFINITY;
737 /** \brief Check if exact pool address should be used.
738 @param s SNAT session
739 @return true if exact pool address
742 nat44_ed_is_exact_address_session (snat_session_t *s)
744 return s->flags & SNAT_SESSION_FLAG_EXACT_ADDRESS;
747 /** \brief Check if NAT interface is inside.
748 @param i NAT interface
749 @return true if inside interface
752 nat44_ed_is_interface_inside (snat_interface_t *i)
754 return i->flags & NAT_INTERFACE_FLAG_IS_INSIDE;
757 /** \brief Check if NAT interface is outside.
758 @param i NAT interface
759 @return true if outside interface
762 nat44_ed_is_interface_outside (snat_interface_t *i)
764 return i->flags & NAT_INTERFACE_FLAG_IS_OUTSIDE;
767 /** \brief Check if client initiating TCP connection (received SYN from client)
769 @return true if client initiating TCP connection
772 tcp_flags_is_init (u8 f)
774 return (f & TCP_FLAG_SYN) && !(f & TCP_FLAG_ACK);
778 is_sm_addr_only (u32 f)
780 return (f & NAT_SM_FLAG_ADDR_ONLY);
784 is_sm_out2in_only (u32 f)
786 return (f & NAT_SM_FLAG_OUT2IN_ONLY);
790 is_sm_identity_nat (u32 f)
792 return (f & NAT_SM_FLAG_IDENTITY_NAT);
798 return (f & NAT_SM_FLAG_LB);
802 is_sm_exact_address (u32 f)
804 return (f & NAT_SM_FLAG_EXACT_ADDRESS);
808 is_sm_self_twice_nat (u32 f)
810 return (f & NAT_SM_FLAG_SELF_TWICE_NAT);
814 is_sm_twice_nat (u32 f)
816 return (f & NAT_SM_FLAG_TWICE_NAT);
820 is_sm_switch_address (u32 f)
822 return (f & NAT_SM_FLAG_SWITCH_ADDRESS);
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_info(...) \
830 vlib_log(VLIB_LOG_LEVEL_INFO, snat_main.log_class, __VA_ARGS__)
831 #define nat_log_debug(...)\
832 vlib_log(VLIB_LOG_LEVEL_DEBUG, snat_main.log_class, __VA_ARGS__)
834 clib_error_t *nat44_api_hookup (vlib_main_t *vm);
836 int snat_set_workers (uword *bitmap);
838 int nat44_plugin_enable (nat44_config_t c);
839 int nat44_plugin_disable ();
841 int nat44_ed_add_interface (u32 sw_if_index, u8 is_inside);
842 int nat44_ed_del_interface (u32 sw_if_index, u8 is_inside);
843 int nat44_ed_add_output_interface (u32 sw_if_index);
844 int nat44_ed_del_output_interface (u32 sw_if_index);
846 int nat44_ed_add_address (ip4_address_t *addr, u32 vrf_id, u8 twice_nat);
847 int nat44_ed_del_address (ip4_address_t addr, u8 twice_nat);
848 int nat44_ed_add_interface_address (u32 sw_if_index, u8 twice_nat);
849 int nat44_ed_del_interface_address (u32 sw_if_index, u8 twice_nat);
851 int nat44_ed_add_del_vrf_table (u32 table_vrf_id, bool is_add);
852 int nat44_ed_add_del_vrf_route (u32 table_vrf_id, u32 vrf_id, bool is_add);
853 void nat44_ed_del_vrf_tables ();
855 int nat44_ed_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
856 u16 l_port, u16 e_port, ip_protocol_t proto,
857 u32 vrf_id, u32 sw_if_index, u32 flags,
858 ip4_address_t pool_addr, u8 *tag);
860 int nat44_ed_del_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
861 u16 l_port, u16 e_port, ip_protocol_t proto,
862 u32 vrf_id, u32 sw_if_index, u32 flags);
864 int nat44_ed_add_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
866 nat44_lb_addr_port_t *locals, u32 flags,
867 u8 *tag, u32 affinity);
869 int nat44_ed_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
870 ip_protocol_t proto, u32 flags);
872 int nat44_ed_add_del_lb_static_mapping_local (ip4_address_t e_addr, u16 e_port,
873 ip4_address_t l_addr, u16 l_port,
874 ip_protocol_t proto, u32 vrf_id,
875 u8 probability, u8 is_add);
878 * @brief Delete NAT44 endpoint-dependent session
880 * @param sm snat global configuration data
881 * @param addr IPv4 address
882 * @param port L4 port number
883 * @param proto L4 protocol
884 * @param vrf_id VRF ID
885 * @param is_in 1 = inside network address and port pair, 0 = outside
887 * @return 0 on success, non-zero value otherwise
889 int nat44_ed_del_session (snat_main_t *sm, ip4_address_t *addr, u16 port,
890 ip4_address_t *eh_addr, u16 eh_port, u8 proto,
891 u32 vrf_id, int is_in);
893 void nat44_ed_free_session_data (snat_main_t *sm, snat_session_t *s,
894 u32 thread_index, u8 is_ha);
897 * @brief Set NAT44 session limit (session limit, vrf id)
899 * @param session_limit Session limit
900 * @param vrf_id VRF id
901 * @return 0 on success, non-zero value otherwise
903 int nat44_set_session_limit (u32 session_limit, u32 vrf_id);
906 * @brief Update NAT44 session limit flushing all data (session limit, vrf id)
908 * @param session_limit Session limit
909 * @param vrf_id VRF id
910 * @return 0 on success, non-zero value otherwise
912 int nat44_update_session_limit (u32 session_limit, u32 vrf_id);
914 void expire_per_vrf_sessions (u32 fib_index);
916 int snat_static_mapping_match (vlib_main_t *vm, ip4_address_t match_addr,
917 u16 match_port, u32 match_fib_index,
918 ip_protocol_t match_protocol,
919 ip4_address_t *mapping_addr, u16 *mapping_port,
920 u32 *mapping_fib_index, int by_external,
921 u8 *is_addr_only, twice_nat_type_t *twice_nat,
922 lb_nat_type_t *lb, ip4_address_t *ext_host_addr,
924 snat_static_mapping_t **out);
926 u32 get_thread_idx_by_port (u16 e_port);
928 u32 nat_calc_bihash_buckets (u32 n_elts);
930 void nat44_addresses_free (snat_address_t **addresses);
932 void nat44_ed_sessions_clear ();
934 int nat44_ed_set_frame_queue_nelts (u32 frame_queue_nelts);
936 void nat_6t_l3_l4_csum_calc (nat_6t_flow_t *f);
938 snat_static_mapping_t *nat44_ed_sm_i2o_lookup (snat_main_t *sm,
939 ip4_address_t addr, u16 port,
940 u32 fib_index, u8 proto);
942 snat_static_mapping_t *nat44_ed_sm_o2i_lookup (snat_main_t *sm,
943 ip4_address_t addr, u16 port,
944 u32 fib_index, u8 proto);
946 void nat_syslog_nat44_sadd (u32 ssubix, u32 sfibix, ip4_address_t *isaddr,
947 u16 isport, ip4_address_t *idaddr, u16 idport,
948 ip4_address_t *xsaddr, u16 xsport,
949 ip4_address_t *xdaddr, u16 xdport, u8 proto,
952 void nat_syslog_nat44_sdel (u32 ssubix, u32 sfibix, ip4_address_t *isaddr,
953 u16 isport, ip4_address_t *idaddr, u16 idport,
954 ip4_address_t *xsaddr, u16 xsport,
955 ip4_address_t *xdaddr, u16 xdport, u8 proto,
960 NAT_ED_TRNSL_ERR_SUCCESS = 0,
961 NAT_ED_TRNSL_ERR_TRANSLATION_FAILED = 1,
962 NAT_ED_TRNSL_ERR_FLOW_MISMATCH = 2,
963 NAT_ED_TRNSL_ERR_PACKET_TRUNCATED = 3,
964 NAT_ED_TRNSL_ERR_INNER_IP_CORRUPT = 4,
965 NAT_ED_TRNSL_ERR_INVALID_CSUM = 5,
966 } nat_translation_error_e;
968 nat_translation_error_e nat_6t_flow_buf_translate_i2o (
969 vlib_main_t *vm, snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip,
970 nat_6t_flow_t *f, ip_protocol_t proto, int is_output_feature);
972 nat_translation_error_e nat_6t_flow_buf_translate_o2i (
973 vlib_main_t *vm, snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip,
974 nat_6t_flow_t *f, ip_protocol_t proto, int is_output_feature);
976 #endif /* __included_nat44_ed_h__ */
978 * fd.io coding-style-patch-verification: ON
981 * eval: (c-set-style "gnu")