2 * Copyright (c) 2011-2016 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:
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 * @brief BFD global declarations
19 #ifndef __included_bfd_main_h__
20 #define __included_bfd_main_h__
22 #include <vppinfra/timing_wheel.h>
23 #include <vnet/vnet.h>
24 #include <vnet/bfd/bfd_protocol.h>
25 #include <vnet/bfd/bfd_udp.h>
27 #include <vppinfra/os.h>
29 #define foreach_bfd_mode(F) \
35 #define F(x) BFD_MODE_##x,
42 /** global configuration key ID */
45 /** keeps track of how many sessions reference this key */
49 * key data directly usable for bfd purposes - already padded with zeroes
50 * (so we don't need the actual length)
54 /** authentication type for this key */
55 bfd_auth_type_e auth_type;
58 #define foreach_bfd_poll_state(F) \
62 F (IN_PROGRESS_AND_QUEUED)
66 #define F(x) BFD_POLL_##x,
67 foreach_bfd_poll_state (F)
74 #define foreach_bfd_hop(F) \
75 F (SINGLE, "single") \
80 #define F(sym, str) BFD_HOP_TYPE_##sym,
85 typedef struct bfd_session_s
87 /** index in bfd_main.sessions pool */
91 bfd_state_e local_state;
93 /** remote session state */
94 bfd_state_e remote_state;
97 bfd_hop_type_e hop_type;
99 /** local diagnostics */
100 bfd_diag_code_e local_diag;
102 /** remote diagnostics */
103 bfd_diag_code_e remote_diag;
105 /** local discriminator */
108 /** remote discriminator */
111 /** configured desired min tx interval (microseconds) */
112 u32 config_desired_min_tx_usec;
114 /** configured desired min tx interval (clocks) */
115 u64 config_desired_min_tx_clocks;
117 /** effective desired min tx interval (clocks) */
118 u64 effective_desired_min_tx_clocks;
120 /** configured required min rx interval (microseconds) */
121 u32 config_required_min_rx_usec;
123 /** configured required min rx interval (clocks) */
124 u64 config_required_min_rx_clocks;
126 /** effective required min rx interval (clocks) */
127 u64 effective_required_min_rx_clocks;
129 /** remote min rx interval (microseconds) */
130 u64 remote_min_rx_usec;
132 /** remote min rx interval (clocks) */
133 u64 remote_min_rx_clocks;
135 /** remote min echo rx interval (microseconds) */
136 u64 remote_min_echo_rx_usec;
138 /** remote min echo rx interval (clocks) */
139 u64 remote_min_echo_rx_clocks;
141 /** remote desired min tx interval (clocks) */
142 u64 remote_desired_min_tx_clocks;
144 /** configured detect multiplier */
145 u8 local_detect_mult;
147 /** 1 if remote system sets demand mode, 0 otherwise */
150 /** remote detect multiplier */
151 u8 remote_detect_mult;
153 /** 1 is echo function is active, 0 otherwise */
156 /** set to value of timer in timing wheel, 0 if never set */
157 u64 wheel_time_clocks;
159 /** transmit interval */
160 u64 transmit_interval_clocks;
162 /** next time at which to transmit a packet */
163 u64 tx_timeout_clocks;
165 /** timestamp of last packet transmitted */
168 /** timestamp of last packet received */
171 /** transmit interval for echo packets */
172 u64 echo_transmit_interval_clocks;
174 /** next time at which to transmit echo packet */
175 u64 echo_tx_timeout_clocks;
177 /** timestamp of last echo packet transmitted */
178 u64 echo_last_tx_clocks;
180 /** timestamp of last echo packet received */
181 u64 echo_last_rx_clocks;
183 /** secret used for calculating/checking checksum of echo packets */
186 /** detection time */
187 u64 detection_time_clocks;
189 /** state info regarding poll sequence */
190 bfd_poll_state_e poll_state;
193 * helper for delayed poll sequence - marks either start of running poll
194 * sequence or timeout, after which we can start the next poll sequnce
196 u64 poll_state_start_or_timeout_clocks;
198 /** authentication information */
201 /** current key in use */
202 bfd_auth_key_t *curr_key;
205 * set to next key to use if delayed switch is enabled - in that case
206 * the key is switched when first incoming packet is signed with next_key
208 bfd_auth_key_t *next_key;
210 /** sequence number incremented occasionally or always (if meticulous) */
211 u32 local_seq_number;
213 /** remote sequence number */
214 u32 remote_seq_number;
216 /** set to 1 if remote sequence number is known */
217 u8 remote_seq_number_known;
219 /** current key ID sent out in bfd packet */
222 /** key ID to use when switched to next_key */
226 * set to 1 if delayed action is pending, which might be activation
227 * of authentication, change of key or deactivation
232 /** transport type for this session */
233 bfd_transport_e transport;
235 /** union of transport-specific data */
238 bfd_udp_session_t udp;
245 #define foreach_bfd_listen_event(F) \
246 F (CREATE, "sesion-created") \
247 F (UPDATE, "session-updated") \
248 F (DELETE, "session-deleted")
252 #define F(sym, str) BFD_LISTEN_EVENT_##sym,
253 foreach_bfd_listen_event (F)
255 } bfd_listen_event_e;
258 * session nitification call back function type
260 typedef void (*bfd_notify_fn_t) (bfd_listen_event_e, const bfd_session_t *);
264 /** lock to protect data structures */
265 clib_spinlock_t lock;
266 int lock_recursion_count;
267 uword owner_thread_index;
269 /** Number of event wakeup RPCs in flight. Should be 0 or 1 */
270 int bfd_process_wakeup_events_in_flight;
272 /** The timestamp of last wakeup event being sent */
273 u64 bfd_process_wakeup_event_start_clocks;
275 /** The time it took the last wakeup event to make it to handling */
276 u64 bfd_process_wakeup_event_delay_clocks;
278 /** When the bfd process is supposed to wake up next */
279 u64 bfd_process_next_wakeup_clocks;
281 /** pool of bfd sessions context data */
282 bfd_session_t *sessions;
284 /** timing wheel for scheduling timeouts */
285 timing_wheel_t wheel;
287 /** timing wheel inaccuracy, in clocks */
288 u64 wheel_inaccuracy;
290 /** hashmap - bfd session by discriminator */
291 u32 *session_by_disc;
293 /** background process node index */
294 u32 bfd_process_node_index;
296 /** convenience variables */
297 vlib_main_t *vlib_main;
298 vnet_main_t *vnet_main;
300 /** cpu clocks per second */
303 /** default desired min tx in clocks */
304 u64 default_desired_min_tx_clocks;
306 /** minimum required min rx while echo function is active - clocks */
307 u64 min_required_min_rx_while_echo_clocks;
309 /** for generating random numbers */
312 /** pool of authentication keys */
313 bfd_auth_key_t *auth_keys;
315 /** hashmap - index in pool auth_keys by conf_key_id */
316 u32 *auth_key_by_conf_key_id;
318 /** vector of callback notification functions */
319 bfd_notify_fn_t *listeners;
322 vlib_log_class_t log_class;
325 extern bfd_main_t bfd_main;
327 /** Packet counters */
328 #define foreach_bfd_error(F) \
329 F (NONE, "good bfd packets (processed)") \
330 F (BAD, "invalid bfd packets") \
331 F (DISABLED, "bfd packets received on disabled interfaces")
335 #define F(sym, str) BFD_ERROR_##sym,
336 foreach_bfd_error (F)
341 /** bfd packet trace capture */
350 BFD_EVENT_RESCHEDULE = 1,
351 BFD_EVENT_NEW_SESSION,
352 BFD_EVENT_CONFIG_CHANGED,
353 } bfd_process_event_e;
356 /** echo packet structure */
357 typedef CLIB_PACKED (struct {
358 /** local discriminator */
360 /** expire time of this packet - clocks */
361 u64 expire_time_clocks;
362 /** checksum - based on discriminator, local secret and expire time */
368 bfd_lock (bfd_main_t * bm)
370 uword my_thread_index = __os_thread_index;
372 if (bm->owner_thread_index == my_thread_index
373 && bm->lock_recursion_count > 0)
375 bm->lock_recursion_count++;
379 clib_spinlock_lock_if_init (&bm->lock);
380 bm->lock_recursion_count = 1;
381 bm->owner_thread_index = my_thread_index;
385 bfd_unlock (bfd_main_t * bm)
387 uword my_thread_index = __os_thread_index;
388 ASSERT (bm->owner_thread_index == my_thread_index);
390 if (bm->lock_recursion_count > 1)
392 bm->lock_recursion_count--;
395 bm->lock_recursion_count = 0;
396 bm->owner_thread_index = ~0;
397 clib_spinlock_unlock_if_init (&bm->lock);
401 bfd_lock_check (bfd_main_t * bm)
403 if (PREDICT_FALSE (bm->lock_recursion_count < 1))
404 clib_warning ("lock check failure");
407 u8 *bfd_input_format_trace (u8 * s, va_list * args);
408 bfd_session_t *bfd_get_session (bfd_main_t * bm, bfd_transport_e t);
409 void bfd_put_session (bfd_main_t * bm, bfd_session_t * bs);
410 bfd_session_t *bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx);
411 bfd_session_t *bfd_find_session_by_disc (bfd_main_t * bm, u32 disc);
412 void bfd_session_start (bfd_main_t * bm, bfd_session_t * bs);
413 void bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * bfd, u32 bs_idx);
414 int bfd_consume_echo_pkt (bfd_main_t * bm, vlib_buffer_t * b);
415 int bfd_verify_pkt_common (const bfd_pkt_t * pkt);
416 int bfd_verify_pkt_auth (const bfd_pkt_t * pkt, u16 pkt_size,
418 void bfd_event (bfd_main_t * bm, bfd_session_t * bs);
419 void bfd_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b,
420 bfd_main_t * bm, bfd_session_t * bs,
422 u8 *format_bfd_session (u8 * s, va_list * args);
423 u8 *format_bfd_session_brief (u8 * s, va_list * args);
424 u8 *format_bfd_auth_key (u8 * s, va_list * args);
425 void bfd_session_set_flags (bfd_session_t * bs, u8 admin_up_down);
426 unsigned bfd_auth_type_supported (bfd_auth_type_e auth_type);
427 vnet_api_error_t bfd_auth_activate (bfd_session_t * bs, u32 conf_key_id,
428 u8 bfd_key_id, u8 is_delayed);
429 vnet_api_error_t bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed);
430 vnet_api_error_t bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs,
431 u32 desired_min_tx_usec,
432 u32 required_min_rx_usec,
435 u32 bfd_clocks_to_usec (const bfd_main_t * bm, u64 clocks);
436 const char *bfd_poll_state_string (bfd_poll_state_e state);
438 #define USEC_PER_MS 1000LL
439 #define USEC_PER_SECOND (1000 * USEC_PER_MS)
441 /** default, slow transmission interval for BFD packets, per spec at least 1s */
442 #define BFD_DEFAULT_DESIRED_MIN_TX_USEC USEC_PER_SECOND
445 * minimum required min rx set locally when echo function is used, per spec
446 * should be set to at least 1s
448 #define BFD_REQUIRED_MIN_RX_USEC_WHILE_ECHO USEC_PER_SECOND
451 * Register a callback function to receive session notifications.
453 void bfd_register_listener (bfd_notify_fn_t fn);
455 #endif /* __included_bfd_main_h__ */
458 * fd.io coding-style-patch-verification: ON
461 * eval: (c-set-style "gnu")