2 * Copyright (c) 2011-2014 M3S, Srl - Italy
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * Rapid Spanning Tree Protocol (IEEE 802.1D-2004) common header file.
21 * Martino Fornasa <mf@fornasa.it>
22 * Daniele Venturino <daniele.venturino@m3s.it>
24 * References to IEEE 802.1D-2004 standard are enclosed in square brackets.
25 * E.g. [17.3], [Table 17-1], etc.
30 #define RSTP_COMMON_H 1
36 #include "ovs-atomic.h"
39 enum admin_port_state {
40 RSTP_ADMIN_BRIDGE_PORT_STATE_DISABLED = 0,
41 RSTP_ADMIN_BRIDGE_PORT_STATE_ENABLED = 1
44 enum oper_p2p_mac_state {
45 RSTP_OPER_P2P_MAC_STATE_DISABLED = 0,
46 RSTP_OPER_P2P_MAC_STATE_ENABLED = 1
49 /* State enumerations for state machines defined in rstp-state-machines.c */
50 enum port_receive_state_machine {
52 PORT_RECEIVE_SM_DISCARD_EXEC,
53 PORT_RECEIVE_SM_DISCARD,
54 PORT_RECEIVE_SM_RECEIVE_EXEC,
55 PORT_RECEIVE_SM_RECEIVE
57 enum port_transmit_state_machine {
58 PORT_TRANSMIT_SM_INIT,
59 PORT_TRANSMIT_SM_TRANSMIT_INIT_EXEC,
60 PORT_TRANSMIT_SM_TRANSMIT_INIT,
61 PORT_TRANSMIT_SM_TRANSMIT_PERIODIC_EXEC,
62 PORT_TRANSMIT_SM_TRANSMIT_PERIODIC,
63 PORT_TRANSMIT_SM_IDLE_EXEC,
64 PORT_TRANSMIT_SM_IDLE,
65 PORT_TRANSMIT_SM_TRANSMIT_CONFIG_EXEC,
66 PORT_TRANSMIT_SM_TRANSMIT_CONFIG,
67 PORT_TRANSMIT_SM_TRANSMIT_TCN_EXEC,
68 PORT_TRANSMIT_SM_TRANSMIT_TCN,
69 PORT_TRANSMIT_SM_TRANSMIT_RSTP_EXEC,
70 PORT_TRANSMIT_SM_TRANSMIT_RSTP
72 enum bridge_detection_state_machine {
73 BRIDGE_DETECTION_SM_INIT,
74 BRIDGE_DETECTION_SM_EDGE_EXEC,
75 BRIDGE_DETECTION_SM_EDGE,
76 BRIDGE_DETECTION_SM_NOT_EDGE_EXEC,
77 BRIDGE_DETECTION_SM_NOT_EDGE
79 enum port_protocol_migration_state_machine {
80 PORT_PROTOCOL_MIGRATION_SM_INIT,
81 PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP_EXEC,
82 PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP,
83 PORT_PROTOCOL_MIGRATION_SM_SELECTING_STP_EXEC,
84 PORT_PROTOCOL_MIGRATION_SM_SELECTING_STP,
85 PORT_PROTOCOL_MIGRATION_SM_SENSING_EXEC,
86 PORT_PROTOCOL_MIGRATION_SM_SENSING
88 enum port_information_state_machine {
89 PORT_INFORMATION_SM_INIT,
90 PORT_INFORMATION_SM_DISABLED_EXEC,
91 PORT_INFORMATION_SM_DISABLED,
92 PORT_INFORMATION_SM_AGED_EXEC,
93 PORT_INFORMATION_SM_AGED,
94 PORT_INFORMATION_SM_UPDATE_EXEC,
95 PORT_INFORMATION_SM_UPDATE,
96 PORT_INFORMATION_SM_CURRENT_EXEC,
97 PORT_INFORMATION_SM_CURRENT,
98 PORT_INFORMATION_SM_RECEIVE_EXEC,
99 PORT_INFORMATION_SM_RECEIVE,
100 PORT_INFORMATION_SM_OTHER_EXEC,
101 PORT_INFORMATION_SM_OTHER,
102 PORT_INFORMATION_SM_NOT_DESIGNATED_EXEC,
103 PORT_INFORMATION_SM_NOT_DESIGNATED,
104 PORT_INFORMATION_SM_INFERIOR_DESIGNATED_EXEC,
105 PORT_INFORMATION_SM_INFERIOR_DESIGNATED,
106 PORT_INFORMATION_SM_REPEATED_DESIGNATED_EXEC,
107 PORT_INFORMATION_SM_REPEATED_DESIGNATED,
108 PORT_INFORMATION_SM_SUPERIOR_DESIGNATED_EXEC,
109 PORT_INFORMATION_SM_SUPERIOR_DESIGNATED
111 enum port_role_selection_state_machine {
112 PORT_ROLE_SELECTION_SM_INIT,
113 PORT_ROLE_SELECTION_SM_INIT_BRIDGE_EXEC,
114 PORT_ROLE_SELECTION_SM_INIT_BRIDGE,
115 PORT_ROLE_SELECTION_SM_ROLE_SELECTION_EXEC,
116 PORT_ROLE_SELECTION_SM_ROLE_SELECTION
118 enum port_role_transition_state_machine {
119 PORT_ROLE_TRANSITION_SM_INIT,
120 PORT_ROLE_TRANSITION_SM_INIT_PORT_EXEC,
121 PORT_ROLE_TRANSITION_SM_DISABLE_PORT_EXEC,
122 PORT_ROLE_TRANSITION_SM_DISABLE_PORT,
123 PORT_ROLE_TRANSITION_SM_DISABLED_PORT_EXEC,
124 PORT_ROLE_TRANSITION_SM_DISABLED_PORT,
125 PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC,
126 PORT_ROLE_TRANSITION_SM_ROOT_PORT,
127 PORT_ROLE_TRANSITION_SM_REROOT_EXEC,
128 PORT_ROLE_TRANSITION_SM_ROOT_AGREED_EXEC,
129 PORT_ROLE_TRANSITION_SM_ROOT_PROPOSED_EXEC,
130 PORT_ROLE_TRANSITION_SM_ROOT_FORWARD_EXEC,
131 PORT_ROLE_TRANSITION_SM_ROOT_LEARN_EXEC,
132 PORT_ROLE_TRANSITION_SM_REROOTED_EXEC,
133 PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC,
134 PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT,
135 PORT_ROLE_TRANSITION_SM_DESIGNATED_RETIRED_EXEC,
136 PORT_ROLE_TRANSITION_SM_DESIGNATED_SYNCED_EXEC,
137 PORT_ROLE_TRANSITION_SM_DESIGNATED_PROPOSE_EXEC,
138 PORT_ROLE_TRANSITION_SM_DESIGNATED_FORWARD_EXEC,
139 PORT_ROLE_TRANSITION_SM_DESIGNATED_LEARN_EXEC,
140 PORT_ROLE_TRANSITION_SM_DESIGNATED_DISCARD_EXEC,
141 PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT_EXEC,
142 PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT,
143 PORT_ROLE_TRANSITION_SM_ALTERNATE_AGREED,
144 PORT_ROLE_TRANSITION_SM_ALTERNATE_PROPOSED_EXEC,
145 PORT_ROLE_TRANSITION_SM_BLOCK_PORT_EXEC,
146 PORT_ROLE_TRANSITION_SM_BLOCK_PORT,
147 PORT_ROLE_TRANSITION_SM_BACKUP_PORT_EXEC
149 enum port_state_transition_state_machine {
150 PORT_STATE_TRANSITION_SM_INIT,
151 PORT_STATE_TRANSITION_SM_DISCARDING_EXEC,
152 PORT_STATE_TRANSITION_SM_DISCARDING,
153 PORT_STATE_TRANSITION_SM_LEARNING_EXEC,
154 PORT_STATE_TRANSITION_SM_LEARNING,
155 PORT_STATE_TRANSITION_SM_FORWARDING_EXEC,
156 PORT_STATE_TRANSITION_SM_FORWARDING
158 enum topology_change_state_machine {
159 TOPOLOGY_CHANGE_SM_INIT,
160 TOPOLOGY_CHANGE_SM_INACTIVE_EXEC,
161 TOPOLOGY_CHANGE_SM_INACTIVE,
162 TOPOLOGY_CHANGE_SM_LEARNING_EXEC,
163 TOPOLOGY_CHANGE_SM_LEARNING,
164 TOPOLOGY_CHANGE_SM_DETECTED_EXEC,
165 TOPOLOGY_CHANGE_SM_ACTIVE_EXEC,
166 TOPOLOGY_CHANGE_SM_ACTIVE,
167 TOPOLOGY_CHANGE_SM_ACKNOWLEDGED_EXEC,
168 TOPOLOGY_CHANGE_SM_PROPAGATING_EXEC,
169 TOPOLOGY_CHANGE_SM_NOTIFIED_TC_EXEC,
170 TOPOLOGY_CHANGE_SM_NOTIFIED_TCN_EXEC,
174 /* [17.18.4, 17.13, Table 17-1]. */
176 /* [17.13.5 - Bridge Forward Delay] The delay (expressed in seconds) used
177 * by STP Bridges (17.4) to transition Root and Designated Ports to
178 * Forwarding (Table 17-1).
179 * Default = 15.0 s. Values in range 4.0 - 30.0
181 uint16_t forward_delay;
183 /* [17.13.6 - Bridge Hello Time]
184 * The interval between periodic transmissions of Configuration Messages
185 * by Designated Ports (Table 17-1).
186 * Default = 2.0 s. Fixed value
190 /* [17.13.8 - Bridge Max Age]
191 * The maximum age of the information transmitted by the Bridge when it is
192 * the Root Bridge (Table 17-1).
193 * Default = 20.0 s. Values in range 6.0 - 40.0 */
196 uint16_t message_age;
199 /* Priority vector [17.6] */
200 struct rstp_priority_vector {
201 rstp_identifier root_bridge_id;
202 uint32_t root_path_cost;
203 rstp_identifier designated_bridge_id;
204 uint16_t designated_port_id;
205 uint16_t bridge_port_id;
208 enum rstp_bpdu_type {
209 CONFIGURATION_BPDU = 0x0,
210 TOPOLOGY_CHANGE_NOTIFICATION_BPDU = 0x80,
211 RAPID_SPANNING_TREE_BPDU = 0x2
214 enum rstp_bpdu_flag {
215 BPDU_FLAG_TOPCHANGE = 0x01,
216 BPDU_FLAG_PROPOSAL = 0x02,
217 BPDU_FLAG_LEARNING = 0x10,
218 BPDU_FLAG_FORWARDING = 0x20,
219 BPDU_FLAG_AGREEMENT = 0x40,
220 BPDU_FLAG_TOPCHANGEACK = 0x80
223 /* Rapid Spanning Tree BPDU [9.3.3] */
226 ovs_be16 protocol_identifier;
227 uint8_t protocol_version_identifier;
230 ovs_be64 root_bridge_id;
231 ovs_be32 root_path_cost;
232 ovs_be64 designated_bridge_id;
233 ovs_be16 designated_port_id;
234 ovs_be16 message_age;
237 ovs_be16 forward_delay;
238 uint8_t version1_length;
242 enum rstp_admin_point_to_point_mac_state {
243 RSTP_ADMIN_P2P_MAC_FORCE_TRUE,
244 RSTP_ADMIN_P2P_MAC_FORCE_FALSE,
245 RSTP_ADMIN_P2P_MAC_FORCE_AUTO
255 enum rstp_rcvd_info {
256 SUPERIOR_DESIGNATED_INFO,
257 REPEATED_DESIGNATED_INFO,
258 INFERIOR_DESIGNATED_INFO,
259 INFERIOR_ROOT_ALTERNATE_INFO,
264 struct ovs_refcount ref_cnt;
266 struct rstp *rstp OVS_GUARDED_BY(rstp_mutex);
267 struct list node OVS_GUARDED_BY(rstp_mutex); /* Node in rstp->ports list. */
268 void *aux OVS_GUARDED_BY(rstp_mutex);
269 struct rstp_bpdu received_bpdu_buffer OVS_GUARDED_BY(rstp_mutex);
270 /*************************************************************************
271 * MAC status parameters
272 ************************************************************************/
273 /* [6.4.2 - MAC_Operational]
274 * The value of this parameter is TRUE if [...] the MAC entity can be used
275 * to transmit and/or receive frames, and its use is permitted by
278 bool mac_operational OVS_GUARDED_BY(rstp_mutex);
280 /* [14.8.2.2] Administrative Bridge Port State */
281 bool is_administrative_bridge_port OVS_GUARDED_BY(rstp_mutex);
283 /* [6.4.3 - operPointToPointMAC]
284 * a) True. The MAC is connected to a point-to-point LAN; i.e., there is
285 * at most one other system attached to the LAN.
286 * b) False. The MAC is connected to a non-point-to-point LAN; i.e.,
287 * there can be more than one other system attached to the LAN.
289 * If adminPointToPointMAC is set to ForceTrue, then operPointToPointMAC
290 * shall be set True. If adminPointToPointMAC is set to ForceFalse, then
291 * operPointToPointMAC shall be set False.
293 bool oper_point_to_point_mac OVS_GUARDED_BY(rstp_mutex);
295 /* [6.4.3 - adminPointToPointMAC]
296 * a) ForceTrue. The administrator requires the MAC to be treated as if it
297 * is connected to a point-to-point LAN, regardless of any indications
298 * to the contrary that are generated by the MAC entity.
299 * b) ForceFalse. The administrator requires the MAC to be treated as
300 * connected to a non-point-to-point LAN, regardless of any indications
301 * to the contrary that are generated by the MAC entity.
302 * c) Auto. The administrator requires the point-to-point status of the
303 * MAC to be determined in accordance with the specific MAC procedures
306 enum rstp_admin_point_to_point_mac_state admin_point_to_point_mac OVS_GUARDED_BY(rstp_mutex);
309 /*************************************************************************
310 * [17.3 - RSTP performance parameters] Set by management actions on the
312 *************************************************************************/
314 /* [17.13.1 - Admin Edge Port]
315 * The AdminEdgePort parameter for the Port (14.8.2).
317 bool admin_edge OVS_GUARDED_BY(rstp_mutex);
319 /* [17.13.3 - AutoEdge]
320 * The AutoEdgePort parameter for the Port (14.8.2).
322 bool auto_edge OVS_GUARDED_BY(rstp_mutex);
325 /*************************************************************************
326 * The following variables are set by management actions on the bridge
327 ************************************************************************/
329 /* Port number and priority
330 * >=1 (max 12 bits [9.2.7])
332 uint16_t port_number OVS_GUARDED_BY(rstp_mutex);
335 * Range: 0-240 in steps of 16 (table 17-2)
337 uint8_t priority OVS_GUARDED_BY(rstp_mutex);
339 /* [17.13.11 - PortPathCost]
340 * The Port's contribution, when it is the Root Port, to the Root Path Cost
341 * (17.3.1, 17.5, 17.6) for the Bridge.
343 uint32_t port_path_cost OVS_GUARDED_BY(rstp_mutex);
345 /*************************************************************************
346 * The following variables are defined in [17.17 - State machine timers]
347 ************************************************************************/
348 /* [17.17.1 - edgeDelayWhile]
349 * The Edge Delay timer. The time remaining, in the absence of a received
350 * BPDU, before this port is identified as an operEdgePort.
352 uint16_t edge_delay_while OVS_GUARDED_BY(rstp_mutex);
354 /* [17.17.2 - fdWhile]
355 * The Forward Delay timer. Used to delay Port State transitions until
356 * other Bridges have received spanning tree information.
358 uint16_t fd_while OVS_GUARDED_BY(rstp_mutex);
360 /* [17.17.3 - helloWhen]
361 * The Hello timer. Used to ensure that at least one BPDU is transmitted by
362 * a Designated Port in each HelloTime period.
364 uint16_t hello_when OVS_GUARDED_BY(rstp_mutex);
366 /* [17.17.4 - mdelayWhile]
367 * The Migration Delay timer. Used by the Port Protocol Migration state
368 * machine to allow time for another RSTP Bridge on the same LAN to
369 * synchronize its migration state with this Port before the receipt of a
370 * BPDU can cause this Port to change the BPDU types it transmits.
371 * Initialized to MigrateTime (17.13.9).
373 uint16_t mdelay_while OVS_GUARDED_BY(rstp_mutex);
375 /* [17.17.5 - rbWhile]
376 * The Recent Backup timer. Maintained at its initial value, twice
377 * HelloTime, while the Port is a Backup Port.
379 uint16_t rb_while OVS_GUARDED_BY(rstp_mutex);
381 /* [17.17.6 - rcvdInfoWhile]
382 * The Received Info timer. The time remaining before the spanning tree
383 * information received by this Port [portPriority (17.19.21) and portTimes
384 * (17.19.22)] is aged out if not refreshed by the receipt of a further
385 * Configuration Message.
387 uint16_t rcvd_info_while OVS_GUARDED_BY(rstp_mutex);
389 /* [17.17.7 - rrWhile]
390 * The Recent Root timer.
392 uint16_t rr_while OVS_GUARDED_BY(rstp_mutex);
394 /* [17.17.8 - tcWhile]
395 * The Topology Change timer. TCN Messages are sent while this timer is
398 uint16_t tc_while OVS_GUARDED_BY(rstp_mutex);
401 /*************************************************************************
402 * The following variables are defined in [17.19 - Per-Port variables]
403 ************************************************************************/
405 /* [17.19.1 - ageingTime]
406 * Filtering database entries for this Port are aged out after ageingTime
407 * has elapsed since they were first created or refreshed by the Learning
409 * The value of this parameter is normally Ageing Time (7.9.2, Table 7-5),
410 * and is changed to FwdDelay (17.20.6) for a period of FwdDelay after
411 * fdbFlush (17.19.7) is set by the topology change state machine if
412 * stpVersion (17.19.7) is TRUE.
414 uint32_t ageing_time OVS_GUARDED_BY(rstp_mutex);
417 * Set if synced is set for all other Ports. An RST BPDU with the Agreement
418 * flag set is transmitted and proposed is reset when agree is first set,
419 * and when proposed is set.
420 * Initialized by Port Information state machine.
422 bool agree OVS_GUARDED_BY(rstp_mutex);
424 /* [17.19.3 - agreed]
425 * Set when an RST BPDU is received with a Port Role of Root, Alternate, or
426 * Backup Port, the Agreement flag set, and a message priority the same or
427 * worse than the port priority. When agreed is set, the Designated Port
428 * knows that its neighbouring Bridge has confirmed that it can proceed to
429 * the Forwarding state without further delay.
430 * Initialized by Port Information state machine.
432 bool agreed OVS_GUARDED_BY(rstp_mutex);
434 /* [17.19.4 - designatedPriority]
435 * The first four components of the Port's designated priority vector
436 * value, as defined in 17.6. The fifth component of the designated
437 * priority vector value is portId (17.19.19).
438 * (Fifth component of the structure must not be used)
440 struct rstp_priority_vector designated_priority_vector OVS_GUARDED_BY(rstp_mutex);
442 /* [17.19.5 - designatedTimes]
443 * The designatedTimes variable comprises the set of timer parameter values
444 * (Message Age, Max Age, Forward Delay, and Hello Time) that used to
445 * update Port Times when updtInfo is set. Updated by the updtRolesTree()
446 * procedure (17.21.25).
448 struct rstp_times designated_times OVS_GUARDED_BY(rstp_mutex);
450 /* [17.19.6 - disputed] */
451 bool disputed OVS_GUARDED_BY(rstp_mutex);
453 /* [17.19.7 - fdbFlush]
454 * A boolean. Set by the topology change state machine to instruct the
455 * filtering database to remove all entries for this Port, immediately if
456 * rstpVersion (17.20.11) is TRUE, or by rapid ageing (17.19.1) if
457 * stpVersion (17.20.12) is TRUE. Reset by the filtering database once the
459 * removed if rstpVersion is TRUE, and immediately if stpVersion is TRUE.
461 uint8_t fdb_flush OVS_GUARDED_BY(rstp_mutex);
463 /* [17.19.8 - forward]
464 * Initialized by Port State Transition state machine.
466 bool forward OVS_GUARDED_BY(rstp_mutex);
468 /* [17.19.9 - forwarding]
469 * Initialized by Port State Transition state machine.
471 bool forwarding OVS_GUARDED_BY(rstp_mutex);
473 /* [17.19.10 - infoIs]
474 * A variable that takes the values Mine, Aged, Received, or Disabled, to
475 * indicate the origin/state of the Port's Spanning Tree information
476 * (portInfo) held for the Port, as follows:
477 * a) If infoIs is Received, the port has received current (not aged out)
478 * information from the Designated Bridge for the attached LAN (a
479 * point-to-point bridge link being a special case of a LAN).
480 * b) If infoIs is Mine, information for the port has been derived from
481 * the Root Port for the Bridge (with the addition of root port cost
482 * information). This includes the possibility that the Root Port is
483 * "Port 0," i.e., the bridge is the Root Bridge for the Bridged Local
485 * c) If infoIs is Aged, information from the Root Bridge has been aged
486 * out. Just as for "reselect" (see 17.19.34), the state machine does
487 * not formally allow the "Aged" state to persist. However, if there is
488 * a delay in recomputing the new root port, correct processing of a
489 * received BPDU is specified.
490 * d) Finally if the port is disabled, infoIs is Disabled.
492 enum rstp_info_is info_is OVS_GUARDED_BY(rstp_mutex);
494 /* [17.19.11 - learn]
495 * Initialized by Port State Transition state machine.
497 bool learn OVS_GUARDED_BY(rstp_mutex);
499 /* [17.19.12 - learning]
500 * Initialized by Port State Transition state machine.
502 bool learning OVS_GUARDED_BY(rstp_mutex);
504 /* [17.19.13 - mcheck]
505 * A boolean. May be set by management to force the Port Protocol Migration
506 * state machine to transmit RST BPDUs for a MigrateTime (17.13.9) period,
507 * to test whether all STP Bridges (17.4) on the attached LAN have been
508 * removed and the Port can continue to transmit RSTP BPDUs. Setting mcheck
509 * has no effect if stpVersion (17.20.12) is TRUE, i.e., the Bridge is
510 * operating in STP Compatibility mode.
512 bool mcheck OVS_GUARDED_BY(rstp_mutex);
514 /* [17.19.14 - msgPriority]
515 * The first four components of the message priority vector conveyed in a
516 * received BPDU, as defined in 17.6.
517 * (Fifth component of the structure must not be used).
519 struct rstp_priority_vector msg_priority OVS_GUARDED_BY(rstp_mutex);
521 /* [17.19.15 - msgTimes]
522 * The msgTimes variable comprises the timer parameter values (Message Age,
523 * Max Age, Forward Delay, and Hello Time) conveyed in a received BPDU.
525 struct rstp_times msg_times OVS_GUARDED_BY(rstp_mutex);
527 /* [17.19.16 - newInfo]
528 * A boolean. Set if a BPDU is to be transmitted. Reset by the Port
529 * Transmit state machine.
531 bool new_info OVS_GUARDED_BY(rstp_mutex);
533 /* [17.19.17 - operEdge]
534 * A boolean. The value of the operEdgePort parameter, as determined by the
535 * operation of the Bridge Detection state machine (17.25).
537 bool oper_edge OVS_GUARDED_BY(rstp_mutex);
539 /* [17.19.18 - portEnabled]
540 * A boolean. Set if the Bridge's MAC Relay Entity and Spanning Tree
541 * Protocol Entity can use the MAC Service provided by the Port's MAC
542 * entity to transmit and receive frames to and from the attached LAN,
543 * i.e., portEnabled is TRUE if and only if:
544 * a) MAC_Operational (6.4.2) is TRUE; and
545 * b) Administrative Bridge Port State (14.8.2.2) for the Port is
547 * c) AuthControlledPortStatus is Authorized [if the port is a network
548 * access port (IEEE Std 802.1X)].
550 bool port_enabled OVS_GUARDED_BY(rstp_mutex);
552 /* [17.19.19 - portId]
553 * The Port Identifier. This variable forms the fifth component of the port
554 * priority and designated priority vectors defined in 17.6.
556 uint16_t port_id OVS_GUARDED_BY(rstp_mutex);
558 /* [17.19.21 - portPriority]
559 * The first four components of the Port's port priority vector value, as
561 * (Fifth component of the structure must not be used)
563 struct rstp_priority_vector port_priority OVS_GUARDED_BY(rstp_mutex);
565 /* [17.19.22 - portTimes]
566 * The portTimes variable comprises the Port's timer parameter values
567 * (Message Age, Max Age, Forward Delay, and Hello Time). These timer
568 * values are used in BPDUs transmitted from the Port.
570 struct rstp_times port_times OVS_GUARDED_BY(rstp_mutex);
572 /* [17.19.23 - proposed]
573 * Set when an RST BPDU with a Designated Port role and the Proposal flag
574 * set is received. If agree is not set, proposed causes sync to be set for
575 * all other Ports.of the Bridge.
577 bool proposed OVS_GUARDED_BY(rstp_mutex);
579 /* [17.19.24 - proposing]
580 * Set by a Designated Port that is not Forwarding, and conveyed to the
581 * Root Port or Alternate Port of a neighboring Bridge in the Proposal flag
582 * of an RST BPDU (9.3.3).
584 bool proposing OVS_GUARDED_BY(rstp_mutex);
586 /* [17.19.25 - rcvdBPDU]
587 * A boolean. Set by system dependent processes, this variable notifies the
588 * Port Receive state machine (17.23) when a valid (9.3.4) Configuration,
589 * TCN, or RST BPDU (9.3.1, 9.3.2, 9.3.3) is received on the Port. Reset
590 * by the Port Receive state machine.
592 bool rcvd_bpdu OVS_GUARDED_BY(rstp_mutex);
594 /* [17.19.26 - rcvdInfo]
595 * Set to the result of the rcvInfo() procedure (17.21.8).
597 enum rstp_rcvd_info rcvd_info OVS_GUARDED_BY(rstp_mutex);
599 /* [17.19.27 - rcvdMsg] */
600 bool rcvd_msg OVS_GUARDED_BY(rstp_mutex);
602 /* [17.19.28 - rcvdRSTP] */
603 bool rcvd_rstp OVS_GUARDED_BY(rstp_mutex);
605 /* [17.19.29 - rcvdSTP] */
606 bool rcvd_stp OVS_GUARDED_BY(rstp_mutex);
608 /* [17.19.30 - rcvdTc] */
609 bool rcvd_tc OVS_GUARDED_BY(rstp_mutex);
611 /* [17.19.31 - rcvdTcAck] */
612 bool rcvd_tc_ack OVS_GUARDED_BY(rstp_mutex);
614 /* [17.19.32 - rcvdTcn] */
615 bool rcvd_tcn OVS_GUARDED_BY(rstp_mutex);
617 /* [17.19.33 - reRoot] */
618 bool re_root OVS_GUARDED_BY(rstp_mutex);
620 /* [17.19.34 - reselect] */
621 bool reselect OVS_GUARDED_BY(rstp_mutex);
624 * The assigned Port Role (17.7).
626 enum rstp_port_role role OVS_GUARDED_BY(rstp_mutex);
628 /* [17.19.36 - selected]
629 * A boolean. See 17.28, 17.21.16.
631 bool selected OVS_GUARDED_BY(rstp_mutex);
633 /* [17.19.37 - selectedRole]
634 * The newly computed role for the Port (17.7, 17.28, 17.21.25, 17.19.35).
636 enum rstp_port_role selected_role OVS_GUARDED_BY(rstp_mutex);
638 /* [17.19.38 - sendRSTP]
639 * A boolean. See 17.24, 17.26.
641 bool send_rstp OVS_GUARDED_BY(rstp_mutex);
644 * A boolean. See 17.10.
646 bool sync OVS_GUARDED_BY(rstp_mutex);
648 /* [17.19.40 - synced]
649 * A boolean. See 17.10.
651 bool synced OVS_GUARDED_BY(rstp_mutex);
653 /* [17.19.41 - tcAck]
654 * A boolean. Set if a Configuration Message with a topology change
655 * acknowledge flag set is to be transmitted.
657 bool tc_ack OVS_GUARDED_BY(rstp_mutex);
659 /* [17.19.42 - tcProp]
660 * A boolean. Set by the Topology Change state machine of any other Port,
661 * to indicate that a topology change should be propagated through this
664 bool tc_prop OVS_GUARDED_BY(rstp_mutex);
667 * A boolean. See 17.22.
669 bool tick OVS_GUARDED_BY(rstp_mutex);
671 /* [17.19.44 - txCount]
672 * A counter. Incremented by the Port Transmission (17.26) state machine on
673 * every BPDU transmission, and decremented used by the Port Timers state
674 * machine (17.22) once a second. Transmissions are delayed if txCount
675 * reaches TxHoldCount (17.13.12).
677 uint16_t tx_count OVS_GUARDED_BY(rstp_mutex);
679 /* [17.19.45 - updtInfo]
680 * A boolean. Set by the Port Role Selection state machine (17.28,
681 * 17.21.25) to tell the Port Information state machine that it should copy
682 * designatedPriority to portPriority and designatedTimes to portTimes.
684 bool updt_info OVS_GUARDED_BY(rstp_mutex);
686 /* Counter for RSTP received frames - for rstpd */
687 uint32_t rx_rstp_bpdu_cnt;
689 /* Counter for bad RSTP received frames */
690 uint32_t error_count OVS_GUARDED_BY(rstp_mutex);
692 /* [14.8.2.1.3] Outputs
693 * a) Uptime count in seconds of the time elapsed since the Port was last
694 * reset or initialized.
696 uint32_t uptime OVS_GUARDED_BY(rstp_mutex);
698 enum rstp_state rstp_state OVS_GUARDED_BY(rstp_mutex);
699 bool state_changed OVS_GUARDED_BY(rstp_mutex);
701 /* Per-port state machines state */
702 enum port_receive_state_machine port_receive_sm_state OVS_GUARDED_BY(rstp_mutex);
703 enum port_protocol_migration_state_machine port_protocol_migration_sm_state OVS_GUARDED_BY(rstp_mutex);
704 enum bridge_detection_state_machine bridge_detection_sm_state OVS_GUARDED_BY(rstp_mutex);
705 enum port_transmit_state_machine port_transmit_sm_state OVS_GUARDED_BY(rstp_mutex);
706 enum port_information_state_machine port_information_sm_state OVS_GUARDED_BY(rstp_mutex);
707 enum port_role_transition_state_machine port_role_transition_sm_state OVS_GUARDED_BY(rstp_mutex);
708 enum port_state_transition_state_machine port_state_transition_sm_state OVS_GUARDED_BY(rstp_mutex);
709 enum topology_change_state_machine topology_change_sm_state OVS_GUARDED_BY(rstp_mutex);
713 struct list node OVS_GUARDED_BY(rstp_mutex); /* In rstp instances list */
714 char *name; /* Bridge name. */
716 /* Changes in last SM execution. */
717 bool changes OVS_GUARDED_BY(rstp_mutex);
719 /* Per-bridge state machines state */
720 enum port_role_selection_state_machine port_role_selection_sm_state OVS_GUARDED_BY(rstp_mutex);
722 /* Bridge MAC address
723 * (stored in the least significant 48 bits of rstp_identifier).
725 rstp_identifier address OVS_GUARDED_BY(rstp_mutex); /* [7.12.5] */
727 /* Bridge priority */
728 uint16_t priority OVS_GUARDED_BY(rstp_mutex); /* Valid values: 0-61440 in steps of 4096 */
730 /*************************************************************************
731 * [17.3 - RSTP performance parameters]
732 ************************************************************************/
735 * The Spanning Tree Protocol Entity shall be reinitialized, as specified
736 * by the assertion of BEGIN (17.18.1) in the state machine specification,
737 * if the following parameters are modified:
738 * a) Force Protocol Version (17.13.4)
740 * The spanning tree priority vectors and Port Role assignments for a
741 * Bridge shall be recomputed, as specified by the operation of the Port
742 * Role Selection state machine (17.28) by clearing selected (17.19.36) and
743 * setting reselect (17.19.34) for any Port or Ports for which the
744 * following parameters are modified:
745 * b) Bridge Identifier Priority (17.13.7)
746 * c) Port Identifier Priority (17.13.10)
747 * d) Port Path Cost (17.13.11)
749 * If the Transmit Hold Count is modified the value of txCount (17.19.44)
750 * for all Ports shall be set to zero.
752 * The RSTP specification permits changes in other performance parameters
753 * without exceptional actions.
757 /* [17.13.2 - Ageing Time]
758 * The Ageing Time parameter for the Bridge (7.9.2, Table 7-5).
760 uint32_t ageing_time OVS_GUARDED_BY(rstp_mutex);
762 /* [17.13.4 - Force Protocol Version]
763 * The Force Protocol Version parameter for the Bridge (17.4, 14.8.1).
764 * This can take the value 0 (STP Compatibility mode) or 2 (the default,
767 enum rstp_force_protocol_version force_protocol_version OVS_GUARDED_BY(rstp_mutex);
769 /* [17.13.5 - Bridge Forward Delay]
770 * The delay used by STP Bridges (17.4) to transition Root and Designated
771 * Ports to Forwarding (Table 17-1).
773 uint16_t bridge_forward_delay OVS_GUARDED_BY(rstp_mutex);
775 /* [17.13.6 - Bridge Hello Time]
776 * The interval between periodic transmissions of Configuration Messages
777 * by Designated Ports (Table 17-1).
779 uint16_t bridge_hello_time OVS_GUARDED_BY(rstp_mutex);
781 /* [17.13.8 - Bridge Max Age]
782 * The maximum age of the information transmitted by the Bridge when it is
783 * the Root Bridge (Table 17-1).
785 uint16_t bridge_max_age OVS_GUARDED_BY(rstp_mutex);
787 /* [17.13.9 - Migrate Time]
788 * The initial value of the mdelayWhile and edgeDelayWhile timers (17.17.4,
789 * 17.17.1), fixed for all RSTP implementations conforming to this
790 * specification (Table 17-1).
792 uint16_t migrate_time OVS_GUARDED_BY(rstp_mutex);
794 /* [17.13.12 - Transmit Hold Count]
795 * The Transmit Hold Count (Table 17-1) used by the Port Transmit state
796 * machine to limit transmission rate.
798 uint16_t transmit_hold_count OVS_GUARDED_BY(rstp_mutex);
801 /*************************************************************************
802 * The following variables are defined in [17.18 - Per-Bridge variables]
803 ************************************************************************/
806 * A Boolean controlled by the system initialization (17.16). If TRUE
807 * causes all state machines, including per Port state machines, to
808 * continuously execute their initial state.
810 bool begin OVS_GUARDED_BY(rstp_mutex);
812 /* [17.18.2 BridgeIdentifier]
813 * The unique Bridge Identifier assigned to this Bridge, comprising two
814 * components: the Bridge Identifier Priority, which may be modified by
815 * management (see 9.2.5 and 14.8.1.2) and is the more significant when
816 * Bridge Identifiers are compared, and a component derived from the Bridge
817 * Address (7.12.5), which guarantees uniqueness of the Bridge Identifiers
818 * of different Bridges.
820 rstp_identifier bridge_identifier OVS_GUARDED_BY(rstp_mutex);
822 /* [17.8.3 BridgePriority]
823 * The bridge priority vector, as defined in 17.6. The first (RootBridgeID)
824 * and third (DesignatedBridgeID) components are both equal to the value
825 * of the Bridge Identifier (17.18.2). The other components are zero.
827 struct rstp_priority_vector bridge_priority OVS_GUARDED_BY(rstp_mutex);
829 /* [17.18.4 - BridgeTimes]
830 * BridgeTimes comprises four components: the current values of Bridge
831 * Forward Delay, Bridge Hello Time, Bridge Max Age (17.13, Table 17-1),
832 * and a Message Age of zero.
834 struct rstp_times bridge_times OVS_GUARDED_BY(rstp_mutex);
836 /* [17.18.6 - rootPriority]
837 * The first four components of the Bridge's root priority vector, as
840 struct rstp_priority_vector root_priority OVS_GUARDED_BY(rstp_mutex);
842 /* [17.18.5 - rootPortId]
843 * The Port Identifier of the Root Port. This is the fifth component of
844 * the root priority vector, as defined in 17.6.
846 uint16_t root_port_id OVS_GUARDED_BY(rstp_mutex);
848 /* [17.18.7 - rootTimes]
849 * The rootTimes variable comprises the Bridge's operational timer
850 * parameter values (Message Age, Max Age, Forward Delay, and Hello Time),
851 * derived from the values stored in portTimes (17.19.22) for the Root Port
852 * or from BridgeTimes (17.18.4).
854 struct rstp_times root_times OVS_GUARDED_BY(rstp_mutex);
856 /* 17.20 State machine conditions and parameters */
858 /* [17.20.11] rstpVersion
859 * TRUE if Force Protocol Version (17.13.4) is greater than or equal to 2.
861 bool rstp_version OVS_GUARDED_BY(rstp_mutex);
863 /* [17.20.12] stpVersion
864 * TRUE if Force Protocol Version (17.13.4) is less than 2.
866 bool stp_version OVS_GUARDED_BY(rstp_mutex);
869 struct list ports OVS_GUARDED_BY(rstp_mutex);
870 uint16_t ports_count OVS_GUARDED_BY(rstp_mutex);
872 struct ovs_refcount ref_cnt;
874 /* Interface to client. */
875 void (*send_bpdu)(struct ofpbuf *bpdu, int port_no, void *aux);
879 #endif /* rstp-common.h */