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 #define foreach_bfd_mode(F) \
33 #define F(x) BFD_MODE_##x,
40 /* global configuration key ID */
43 /* keeps track of how many sessions reference this key */
47 * key data directly usable for bfd purposes - already padded with zeroes
48 * (so we don't need the actual length)
52 /* authentication type for this key */
53 bfd_auth_type_e auth_type;
56 #define foreach_bfd_poll_state(F) \
60 F (IN_PROGRESS_AND_QUEUED)
64 #define F(x) BFD_POLL_##x,
65 foreach_bfd_poll_state (F)
69 typedef struct bfd_session_s
71 /* index in bfd_main.sessions pool */
75 bfd_state_e local_state;
77 /* local diagnostics */
78 bfd_diag_code_e local_diag;
80 /* remote session state */
81 bfd_state_e remote_state;
83 /* local discriminator */
86 /* remote discriminator */
89 /* configured desired min tx interval (microseconds) */
90 u32 config_desired_min_tx_usec;
92 /* configured desired min tx interval (clocks) */
93 u64 config_desired_min_tx_clocks;
95 /* effective desired min tx interval (clocks) */
96 u64 effective_desired_min_tx_clocks;
98 /* configured required min rx interval (microseconds) */
99 u32 config_required_min_rx_usec;
101 /* configured required min rx interval (clocks) */
102 u64 config_required_min_rx_clocks;
104 /* effective required min rx interval (clocks) */
105 u64 effective_required_min_rx_clocks;
107 /* remote min rx interval (microseconds) */
108 u64 remote_min_rx_usec;
110 /* remote min rx interval (clocks) */
111 u64 remote_min_rx_clocks;
113 /* remote min echo rx interval (microseconds) */
114 u64 remote_min_echo_rx_usec;
116 /* remote min echo rx interval (clocks) */
117 u64 remote_min_echo_rx_clocks;
119 /* remote desired min tx interval (clocks) */
120 u64 remote_desired_min_tx_clocks;
122 /* configured detect multiplier */
123 u8 local_detect_mult;
125 /* 1 if remote system sets demand mode, 0 otherwise */
128 /* remote detect multiplier */
129 u8 remote_detect_mult;
131 /* 1 is echo function is active, 0 otherwise */
134 /* set to value of timer in timing wheel, 0 if never set */
135 u64 wheel_time_clocks;
137 /* transmit interval */
138 u64 transmit_interval_clocks;
140 /* next time at which to transmit a packet */
141 u64 tx_timeout_clocks;
143 /* timestamp of last packet transmitted */
146 /* timestamp of last packet received */
149 /* transmit interval for echo packets */
150 u64 echo_transmit_interval_clocks;
152 /* next time at which to transmit echo packet */
153 u64 echo_tx_timeout_clocks;
155 /* timestamp of last echo packet transmitted */
156 u64 echo_last_tx_clocks;
158 /* timestamp of last echo packet received */
159 u64 echo_last_rx_clocks;
161 /* secret used for calculating/checking checksum of echo packets */
165 u64 detection_time_clocks;
167 /* state info regarding poll sequence */
168 bfd_poll_state_e poll_state;
171 * helper for delayed poll sequence - marks either start of running poll
172 * sequence or timeout, after which we can start the next poll sequnce
174 u64 poll_state_start_or_timeout_clocks;
176 /* authentication information */
179 /* current key in use */
180 bfd_auth_key_t *curr_key;
183 * set to next key to use if delayed switch is enabled - in that case
184 * the key is switched when first incoming packet is signed with next_key
186 bfd_auth_key_t *next_key;
188 /* sequence number incremented occasionally or always (if meticulous) */
189 u32 local_seq_number;
191 /* remote sequence number */
192 u32 remote_seq_number;
194 /* set to 1 if remote sequence number is known */
195 u8 remote_seq_number_known;
197 /* current key ID sent out in bfd packet */
200 /* key ID to use when switched to next_key */
204 * set to 1 if delayed action is pending, which might be activation
205 * of authentication, change of key or deactivation
210 /* transport type for this session */
211 bfd_transport_e transport;
213 /* union of transport-specific data */
216 bfd_udp_session_t udp;
222 /* pool of bfd sessions context data */
223 bfd_session_t *sessions;
225 /* timing wheel for scheduling timeouts */
226 timing_wheel_t wheel;
228 /* timing wheel inaccuracy, in clocks */
229 u64 wheel_inaccuracy;
231 /* hashmap - bfd session by discriminator */
232 u32 *session_by_disc;
234 /* background process node index */
235 u32 bfd_process_node_index;
237 /* convenience variables */
238 vlib_main_t *vlib_main;
239 vnet_main_t *vnet_main;
241 /* cpu clocks per second */
244 /* default desired min tx in clocks */
245 u64 default_desired_min_tx_clocks;
247 /* minimum required min rx while echo function is active - clocks */
248 u64 min_required_min_rx_while_echo_clocks;
250 /* for generating random numbers */
253 /* pool of authentication keys */
254 bfd_auth_key_t *auth_keys;
256 /* hashmap - index in pool auth_keys by conf_key_id */
257 u32 *auth_key_by_conf_key_id;
261 extern bfd_main_t bfd_main;
263 /* Packet counters */
264 #define foreach_bfd_error(F) \
265 F (NONE, "good bfd packets (processed)") \
266 F (BAD, "invalid bfd packets") \
267 F (DISABLED, "bfd packets received on disabled interfaces")
271 #define F(sym, str) BFD_ERROR_##sym,
272 foreach_bfd_error (F)
277 /* bfd packet trace capture */
286 BFD_EVENT_RESCHEDULE = 1,
287 BFD_EVENT_NEW_SESSION,
288 BFD_EVENT_CONFIG_CHANGED,
289 } bfd_process_event_e;
291 /* echo packet structure */
293 typedef CLIB_PACKED (struct {
294 /* local discriminator */
296 /* expire time of this packet - clocks */
297 u64 expire_time_clocks;
298 /* checksum - based on discriminator, local secret and expire time */
303 u8 *bfd_input_format_trace (u8 * s, va_list * args);
304 bfd_session_t *bfd_get_session (bfd_main_t * bm, bfd_transport_e t);
305 void bfd_put_session (bfd_main_t * bm, bfd_session_t * bs);
306 bfd_session_t *bfd_find_session_by_idx (bfd_main_t * bm, uword bs_idx);
307 bfd_session_t *bfd_find_session_by_disc (bfd_main_t * bm, u32 disc);
308 void bfd_session_start (bfd_main_t * bm, bfd_session_t * bs);
309 void bfd_consume_pkt (bfd_main_t * bm, const bfd_pkt_t * bfd, u32 bs_idx);
310 int bfd_consume_echo_pkt (bfd_main_t * bm, vlib_buffer_t * b);
311 int bfd_verify_pkt_common (const bfd_pkt_t * pkt);
312 int bfd_verify_pkt_auth (const bfd_pkt_t * pkt, u16 pkt_size,
314 void bfd_event (bfd_main_t * bm, bfd_session_t * bs);
315 void bfd_init_final_control_frame (vlib_main_t * vm, vlib_buffer_t * b,
316 bfd_main_t * bm, bfd_session_t * bs);
317 u8 *format_bfd_session (u8 * s, va_list * args);
318 void bfd_session_set_flags (bfd_session_t * bs, u8 admin_up_down);
319 unsigned bfd_auth_type_supported (bfd_auth_type_e auth_type);
320 vnet_api_error_t bfd_auth_activate (bfd_session_t * bs, u32 conf_key_id,
321 u8 bfd_key_id, u8 is_delayed);
322 vnet_api_error_t bfd_auth_deactivate (bfd_session_t * bs, u8 is_delayed);
323 vnet_api_error_t bfd_session_set_params (bfd_main_t * bm, bfd_session_t * bs,
324 u32 desired_min_tx_usec,
325 u32 required_min_rx_usec,
328 #define USEC_PER_MS 1000LL
329 #define USEC_PER_SECOND (1000 * USEC_PER_MS)
331 /* default, slow transmission interval for BFD packets, per spec at least 1s */
332 #define BFD_DEFAULT_DESIRED_MIN_TX_USEC USEC_PER_SECOND
335 * minimum required min rx set locally when echo function is used, per spec
336 * should be set to at least 1s
338 #define BFD_REQUIRED_MIN_RX_USEC_WHILE_ECHO USEC_PER_SECOND
340 #endif /* __included_bfd_main_h__ */
343 * fd.io coding-style-patch-verification: ON
346 * eval: (c-set-style "gnu")