3 * snat.h - simple nat definitions
5 * Copyright (c) 2016 Cisco and/or its affiliates.
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at:
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 #ifndef __included_snat_h__
19 #define __included_snat_h__
21 #include <vnet/vnet.h>
22 #include <vnet/ip/ip.h>
23 #include <vnet/ethernet/ethernet.h>
24 #include <vnet/ip/icmp46_packet.h>
25 #include <vnet/api_errno.h>
26 #include <vppinfra/bihash_8_8.h>
27 #include <vppinfra/bihash_16_8.h>
28 #include <vppinfra/dlist.h>
29 #include <vppinfra/error.h>
30 #include <vlibapi/api.h>
33 #define SNAT_UDP_TIMEOUT 300
34 #define SNAT_UDP_TIMEOUT_MIN 120
35 #define SNAT_TCP_TRANSITORY_TIMEOUT 240
36 #define SNAT_TCP_ESTABLISHED_TIMEOUT 7440
37 #define SNAT_TCP_INCOMING_SYN 6
38 #define SNAT_ICMP_TIMEOUT 60
68 } snat_unk_proto_ses_key_t;
75 ip4_address_t ext_host_addr;
109 #define foreach_snat_protocol \
110 _(UDP, 0, udp, "udp") \
111 _(TCP, 1, tcp, "tcp") \
112 _(ICMP, 2, icmp, "icmp")
115 #define _(N, i, n, s) SNAT_PROTOCOL_##N = i,
116 foreach_snat_protocol
121 #define foreach_snat_session_state \
122 _(0, UNKNOWN, "unknown") \
123 _(1, UDP_ACTIVE, "udp-active") \
124 _(2, TCP_SYN_SENT, "tcp-syn-sent") \
125 _(3, TCP_ESTABLISHED, "tcp-established") \
126 _(4, TCP_FIN_WAIT, "tcp-fin-wait") \
127 _(5, TCP_CLOSE_WAIT, "tcp-close-wait") \
128 _(6, TCP_LAST_ACK, "tcp-last-ack") \
129 _(7, ICMP_ACTIVE, "icmp-active")
132 #define _(v, N, s) SNAT_SESSION_##N = v,
133 foreach_snat_session_state
135 } snat_session_state_t;
138 #define SNAT_SESSION_FLAG_STATIC_MAPPING 1
139 #define SNAT_SESSION_FLAG_UNKNOWN_PROTO 2
141 typedef CLIB_PACKED(struct {
142 snat_session_key_t out2in; /* 0-15 */
144 snat_session_key_t in2out; /* 16-31 */
146 u32 flags; /* 32-35 */
148 /* per-user translations */
149 u32 per_user_index; /* 36-39 */
151 u32 per_user_list_head_index; /* 40-43 */
153 /* Last heard timer */
154 f64 last_heard; /* 44-51 */
156 u64 total_bytes; /* 52-59 */
158 u32 total_pkts; /* 60-63 */
160 /* Outside address */
161 u32 outside_address_index; /* 64-67 */
163 /* External host address */
164 ip4_address_t ext_host_addr; /* 68-71 */
172 u32 sessions_per_user_list_head_index;
180 #define _(N, i, n, s) \
181 u32 busy_##n##_ports; \
182 uword * busy_##n##_port_bitmap;
183 foreach_snat_protocol
189 snat_det_out_key_t out;
192 } snat_det_session_t;
195 ip4_address_t in_addr;
197 ip4_address_t out_addr;
202 /* vector of sessions */
203 snat_det_session_t * sessions;
207 ip4_address_t local_addr;
208 ip4_address_t external_addr;
214 snat_protocol_t proto;
215 } snat_static_mapping_t;
223 ip4_address_t l_addr;
228 snat_protocol_t proto;
231 } snat_static_map_resolve_t;
238 snat_session_t * sessions;
240 /* Pool of doubly-linked list elements */
241 dlist_elt_t * list_pool;
242 } snat_main_per_thread_data_t;
246 typedef u32 snat_icmp_match_function_t (struct snat_main_s *sm,
247 vlib_node_runtime_t *node,
251 snat_session_key_t *p_value,
252 u8 *p_dont_translate,
256 typedef u32 (snat_get_worker_function_t) (ip4_header_t * ip, u32 rx_fib_index);
258 typedef struct snat_main_s {
259 /* Main lookup tables */
260 clib_bihash_8_8_t out2in;
261 clib_bihash_8_8_t in2out;
263 /* Unknown protocol sessions lookup tables */
264 clib_bihash_16_8_t out2in_unk_proto;
265 clib_bihash_16_8_t in2out_unk_proto;
267 /* Find-a-user => src address lookup */
268 clib_bihash_8_8_t user_hash;
270 /* Non-translated packets worker lookup => src address + VRF */
271 clib_bihash_8_8_t worker_by_in;
273 /* Translated packets worker lookup => IP address + port number */
274 clib_bihash_8_8_t worker_by_out;
276 snat_icmp_match_function_t * icmp_match_in2out_cb;
277 snat_icmp_match_function_t * icmp_match_out2in_cb;
280 u32 first_worker_index;
283 snat_get_worker_function_t * worker_in2out_cb;
284 snat_get_worker_function_t * worker_out2in_cb;
286 /* Per thread data */
287 snat_main_per_thread_data_t * per_thread_data;
289 /* Find a static mapping by local */
290 clib_bihash_8_8_t static_mapping_by_local;
292 /* Find a static mapping by external */
293 clib_bihash_8_8_t static_mapping_by_external;
295 /* Static mapping pool */
296 snat_static_mapping_t * static_mappings;
299 snat_interface_t * interfaces;
301 /* Vector of outside addresses */
302 snat_address_t * addresses;
304 /* sw_if_indices whose intfc addresses should be auto-added */
305 u32 * auto_add_sw_if_indices;
307 /* vector of interface address static mappings to resolve. */
308 snat_static_map_resolve_t *to_resolve;
310 /* Randomize port allocation order */
313 /* Worker handoff index */
317 /* in2out and out2in node index */
318 u32 in2out_node_index;
319 u32 out2in_node_index;
321 /* Deterministic NAT */
322 snat_det_map_t * det_maps;
324 /* Config parameters */
325 u8 static_mapping_only;
326 u8 static_mapping_connection_tracking;
328 u32 translation_buckets;
329 u32 translation_memory_size;
331 u32 user_memory_size;
332 u32 max_translations_per_user;
334 u32 outside_fib_index;
336 u32 inside_fib_index;
338 /* tenant VRF aware address pool activation flag */
341 /* values of various timeouts */
343 u32 tcp_established_timeout;
344 u32 tcp_transitory_timeout;
347 /* API message ID base */
351 vlib_main_t * vlib_main;
352 vnet_main_t * vnet_main;
353 ip4_main_t * ip4_main;
354 ip_lookup_main_t * ip4_lookup_main;
355 api_main_t * api_main;
358 extern snat_main_t snat_main;
359 extern vlib_node_registration_t snat_in2out_node;
360 extern vlib_node_registration_t snat_out2in_node;
361 extern vlib_node_registration_t snat_in2out_fast_node;
362 extern vlib_node_registration_t snat_out2in_fast_node;
363 extern vlib_node_registration_t snat_in2out_worker_handoff_node;
364 extern vlib_node_registration_t snat_out2in_worker_handoff_node;
365 extern vlib_node_registration_t snat_det_in2out_node;
366 extern vlib_node_registration_t snat_det_out2in_node;
368 void snat_free_outside_address_and_port (snat_main_t * sm,
369 snat_session_key_t * k,
372 int snat_alloc_outside_address_and_port (snat_main_t * sm,
374 snat_session_key_t * k,
375 u32 * address_indexp);
377 int snat_static_mapping_match (snat_main_t * sm,
378 snat_session_key_t match,
379 snat_session_key_t * mapping,
383 void snat_add_del_addr_to_fib (ip4_address_t * addr,
388 format_function_t format_snat_user;
391 u32 cached_sw_if_index;
392 u32 cached_ip4_address;
395 /** \brief Check if SNAT session is created from static mapping.
396 @param s SNAT session
397 @return 1 if SNAT session is created from static mapping otherwise 0
399 #define snat_is_session_static(s) s->flags & SNAT_SESSION_FLAG_STATIC_MAPPING
401 /** \brief Check if SNAT session for unknown protocol.
402 @param s SNAT session
403 @return 1 if SNAT session for unknown protocol otherwise 0
405 #define snat_is_unk_proto_session(s) s->flags & SNAT_SESSION_FLAG_UNKNOWN_PROTO
408 * Why is this here? Because we don't need to touch this layer to
409 * simply reply to an icmp. We need to change id to a unique
410 * value to NAT an echo request/reply.
416 } icmp_echo_header_t;
419 ip_proto_to_snat_proto (u8 ip_proto)
423 snat_proto = (ip_proto == IP_PROTOCOL_UDP) ? SNAT_PROTOCOL_UDP : snat_proto;
424 snat_proto = (ip_proto == IP_PROTOCOL_TCP) ? SNAT_PROTOCOL_TCP : snat_proto;
425 snat_proto = (ip_proto == IP_PROTOCOL_ICMP) ? SNAT_PROTOCOL_ICMP : snat_proto;
426 snat_proto = (ip_proto == IP_PROTOCOL_ICMP6) ? SNAT_PROTOCOL_ICMP : snat_proto;
432 snat_proto_to_ip_proto (snat_protocol_t snat_proto)
436 ip_proto = (snat_proto == SNAT_PROTOCOL_UDP) ? IP_PROTOCOL_UDP : ip_proto;
437 ip_proto = (snat_proto == SNAT_PROTOCOL_TCP) ? IP_PROTOCOL_TCP : ip_proto;
438 ip_proto = (snat_proto == SNAT_PROTOCOL_ICMP) ? IP_PROTOCOL_ICMP : ip_proto;
444 u16 src_port, dst_port;
447 u32 icmp_match_in2out_fast(snat_main_t *sm, vlib_node_runtime_t *node,
448 u32 thread_index, vlib_buffer_t *b0, u8 *p_proto,
449 snat_session_key_t *p_value,
450 u8 *p_dont_translate, void *d, void *e);
451 u32 icmp_match_in2out_slow(snat_main_t *sm, vlib_node_runtime_t *node,
452 u32 thread_index, vlib_buffer_t *b0, u8 *p_proto,
453 snat_session_key_t *p_value,
454 u8 *p_dont_translate, void *d, void *e);
455 u32 icmp_match_in2out_det(snat_main_t *sm, vlib_node_runtime_t *node,
456 u32 thread_index, vlib_buffer_t *b0, u8 *p_proto,
457 snat_session_key_t *p_value,
458 u8 *p_dont_translate, void *d, void *e);
459 u32 icmp_match_out2in_fast(snat_main_t *sm, vlib_node_runtime_t *node,
460 u32 thread_index, vlib_buffer_t *b0, u8 *p_proto,
461 snat_session_key_t *p_value,
462 u8 *p_dont_translate, void *d, void *e);
463 u32 icmp_match_out2in_slow(snat_main_t *sm, vlib_node_runtime_t *node,
464 u32 thread_index, vlib_buffer_t *b0, u8 *p_proto,
465 snat_session_key_t *p_value,
466 u8 *p_dont_translate, void *d, void *e);
467 u32 icmp_match_out2in_det(snat_main_t *sm, vlib_node_runtime_t *node,
468 u32 thread_index, vlib_buffer_t *b0, u8 *p_proto,
469 snat_session_key_t *p_value,
470 u8 *p_dont_translate, void *d, void *e);
471 void increment_v4_address(ip4_address_t * a);
472 void snat_add_address(snat_main_t *sm, ip4_address_t *addr, u32 vrf_id);
473 int snat_del_address(snat_main_t *sm, ip4_address_t addr, u8 delete_sm);
474 int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
475 u16 l_port, u16 e_port, u32 vrf_id, int addr_only,
476 u32 sw_if_index, snat_protocol_t proto, int is_add);
477 clib_error_t * snat_api_init(vlib_main_t * vm, snat_main_t * sm);
478 int snat_set_workers (uword * bitmap);
479 int snat_interface_add_del(u32 sw_if_index, u8 is_inside, int is_del);
480 int snat_add_interface_address(snat_main_t *sm, u32 sw_if_index, int is_del);
481 uword unformat_snat_protocol(unformat_input_t * input, va_list * args);
482 u8 * format_snat_protocol(u8 * s, va_list * args);
484 static_always_inline u8
485 icmp_is_error_message (icmp46_header_t * icmp)
489 case ICMP4_destination_unreachable:
490 case ICMP4_time_exceeded:
491 case ICMP4_parameter_problem:
492 case ICMP4_source_quench:
494 case ICMP4_alternate_host_address:
500 static_always_inline u8
501 is_interface_addr(snat_main_t *sm, vlib_node_runtime_t *node, u32 sw_if_index0,
504 snat_runtime_t *rt = (snat_runtime_t *) node->runtime_data;
505 ip4_address_t * first_int_addr;
507 if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
510 ip4_interface_first_address (sm->ip4_main, sw_if_index0,
511 0 /* just want the address */);
512 rt->cached_sw_if_index = sw_if_index0;
514 rt->cached_ip4_address = first_int_addr->as_u32;
516 rt->cached_ip4_address = 0;
519 if (PREDICT_FALSE(ip4_addr == rt->cached_ip4_address))
525 #endif /* __included_snat_h__ */