lib/rstp-common.h

   1 /*
   2  * Copyright (c) 2011-2015 M3S, Srl - Italy
   3  *
   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:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 /*
  18  * Rapid Spanning Tree Protocol (IEEE 802.1D-2004) common header file.
  19  *
  20  * Authors:
  21  *         Martino Fornasa <mf@fornasa.it>
  22  *         Daniele Venturino <daniele.venturino@m3s.it>
  23  *         Carlo Andreotti <c.andreotti@m3s.it>
  24  *
  25  * References to IEEE 802.1D-2004 standard are enclosed in square brackets.
  26  * E.g. [17.3], [Table 17-1], etc.
  27  *
  28  */
  29
  30 #ifndef RSTP_COMMON_H
  31 #define RSTP_COMMON_H 1
  32
  33 #include "rstp.h"
  34 #include <stdbool.h>
  35 #include <stdint.h>
  36 #include "openvswitch/hmap.h"
  37 #include "openvswitch/list.h"
  38 #include "ovs-atomic.h"
  39 #include "packets.h"
  40
  41 enum admin_port_state {
  42     RSTP_ADMIN_BRIDGE_PORT_STATE_DISABLED = 0,
  43     RSTP_ADMIN_BRIDGE_PORT_STATE_ENABLED = 1
  44 };
  45
  46 enum oper_p2p_mac_state {
  47     RSTP_OPER_P2P_MAC_STATE_DISABLED = 0,
  48     RSTP_OPER_P2P_MAC_STATE_ENABLED = 1
  49 };
  50
  51 /* State enumerations for state machines defined in rstp-state-machines.c */
  52 enum port_receive_state_machine {
  53     PORT_RECEIVE_SM_INIT,
  54     PORT_RECEIVE_SM_DISCARD_EXEC,
  55     PORT_RECEIVE_SM_DISCARD,
  56     PORT_RECEIVE_SM_RECEIVE_EXEC,
  57     PORT_RECEIVE_SM_RECEIVE
  58 };
  59 enum port_transmit_state_machine {
  60     PORT_TRANSMIT_SM_INIT,
  61     PORT_TRANSMIT_SM_TRANSMIT_INIT_EXEC,
  62     PORT_TRANSMIT_SM_TRANSMIT_INIT,
  63     PORT_TRANSMIT_SM_TRANSMIT_PERIODIC_EXEC,
  64     PORT_TRANSMIT_SM_TRANSMIT_PERIODIC,
  65     PORT_TRANSMIT_SM_IDLE_EXEC,
  66     PORT_TRANSMIT_SM_IDLE,
  67     PORT_TRANSMIT_SM_TRANSMIT_CONFIG_EXEC,
  68     PORT_TRANSMIT_SM_TRANSMIT_CONFIG,
  69     PORT_TRANSMIT_SM_TRANSMIT_TCN_EXEC,
  70     PORT_TRANSMIT_SM_TRANSMIT_TCN,
  71     PORT_TRANSMIT_SM_TRANSMIT_RSTP_EXEC,
  72     PORT_TRANSMIT_SM_TRANSMIT_RSTP
  73 };
  74 enum bridge_detection_state_machine {
  75     BRIDGE_DETECTION_SM_INIT,
  76     BRIDGE_DETECTION_SM_EDGE_EXEC,
  77     BRIDGE_DETECTION_SM_EDGE,
  78     BRIDGE_DETECTION_SM_NOT_EDGE_EXEC,
  79     BRIDGE_DETECTION_SM_NOT_EDGE
  80 };
  81 enum port_protocol_migration_state_machine {
  82     PORT_PROTOCOL_MIGRATION_SM_INIT,
  83     PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP_EXEC,
  84     PORT_PROTOCOL_MIGRATION_SM_CHECKING_RSTP,
  85     PORT_PROTOCOL_MIGRATION_SM_SELECTING_STP_EXEC,
  86     PORT_PROTOCOL_MIGRATION_SM_SELECTING_STP,
  87     PORT_PROTOCOL_MIGRATION_SM_SENSING_EXEC,
  88     PORT_PROTOCOL_MIGRATION_SM_SENSING
  89 };
  90 enum port_information_state_machine {
  91     PORT_INFORMATION_SM_INIT,
  92     PORT_INFORMATION_SM_DISABLED_EXEC,
  93     PORT_INFORMATION_SM_DISABLED,
  94     PORT_INFORMATION_SM_AGED_EXEC,
  95     PORT_INFORMATION_SM_AGED,
  96     PORT_INFORMATION_SM_UPDATE_EXEC,
  97     PORT_INFORMATION_SM_UPDATE,
  98     PORT_INFORMATION_SM_CURRENT_EXEC,
  99     PORT_INFORMATION_SM_CURRENT,
 100     PORT_INFORMATION_SM_RECEIVE_EXEC,
 101     PORT_INFORMATION_SM_RECEIVE,
 102     PORT_INFORMATION_SM_OTHER_EXEC,
 103     PORT_INFORMATION_SM_OTHER,
 104     PORT_INFORMATION_SM_NOT_DESIGNATED_EXEC,
 105     PORT_INFORMATION_SM_NOT_DESIGNATED,
 106     PORT_INFORMATION_SM_INFERIOR_DESIGNATED_EXEC,
 107     PORT_INFORMATION_SM_INFERIOR_DESIGNATED,
 108     PORT_INFORMATION_SM_REPEATED_DESIGNATED_EXEC,
 109     PORT_INFORMATION_SM_REPEATED_DESIGNATED,
 110     PORT_INFORMATION_SM_SUPERIOR_DESIGNATED_EXEC,
 111     PORT_INFORMATION_SM_SUPERIOR_DESIGNATED
 112 };
 113 enum port_role_selection_state_machine {
 114     PORT_ROLE_SELECTION_SM_INIT,
 115     PORT_ROLE_SELECTION_SM_INIT_BRIDGE_EXEC,
 116     PORT_ROLE_SELECTION_SM_INIT_BRIDGE,
 117     PORT_ROLE_SELECTION_SM_ROLE_SELECTION_EXEC,
 118     PORT_ROLE_SELECTION_SM_ROLE_SELECTION
 119 };
 120 enum port_role_transition_state_machine {
 121     PORT_ROLE_TRANSITION_SM_INIT,
 122     PORT_ROLE_TRANSITION_SM_INIT_PORT_EXEC,
 123     PORT_ROLE_TRANSITION_SM_DISABLE_PORT_EXEC,
 124     PORT_ROLE_TRANSITION_SM_DISABLE_PORT,
 125     PORT_ROLE_TRANSITION_SM_DISABLED_PORT_EXEC,
 126     PORT_ROLE_TRANSITION_SM_DISABLED_PORT,
 127     PORT_ROLE_TRANSITION_SM_ROOT_PORT_EXEC,
 128     PORT_ROLE_TRANSITION_SM_ROOT_PORT,
 129     PORT_ROLE_TRANSITION_SM_REROOT_EXEC,
 130     PORT_ROLE_TRANSITION_SM_ROOT_AGREED_EXEC,
 131     PORT_ROLE_TRANSITION_SM_ROOT_PROPOSED_EXEC,
 132     PORT_ROLE_TRANSITION_SM_ROOT_FORWARD_EXEC,
 133     PORT_ROLE_TRANSITION_SM_ROOT_LEARN_EXEC,
 134     PORT_ROLE_TRANSITION_SM_REROOTED_EXEC,
 135     PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT_EXEC,
 136     PORT_ROLE_TRANSITION_SM_DESIGNATED_PORT,
 137     PORT_ROLE_TRANSITION_SM_DESIGNATED_RETIRED_EXEC,
 138     PORT_ROLE_TRANSITION_SM_DESIGNATED_SYNCED_EXEC,
 139     PORT_ROLE_TRANSITION_SM_DESIGNATED_PROPOSE_EXEC,
 140     PORT_ROLE_TRANSITION_SM_DESIGNATED_FORWARD_EXEC,
 141     PORT_ROLE_TRANSITION_SM_DESIGNATED_LEARN_EXEC,
 142     PORT_ROLE_TRANSITION_SM_DESIGNATED_DISCARD_EXEC,
 143     PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT_EXEC,
 144     PORT_ROLE_TRANSITION_SM_ALTERNATE_PORT,
 145     PORT_ROLE_TRANSITION_SM_ALTERNATE_AGREED_EXEC,
 146     PORT_ROLE_TRANSITION_SM_ALTERNATE_PROPOSED_EXEC,
 147     PORT_ROLE_TRANSITION_SM_BLOCK_PORT_EXEC,
 148     PORT_ROLE_TRANSITION_SM_BLOCK_PORT,
 149     PORT_ROLE_TRANSITION_SM_BACKUP_PORT_EXEC
 150 };
 151 enum port_state_transition_state_machine {
 152     PORT_STATE_TRANSITION_SM_INIT,
 153     PORT_STATE_TRANSITION_SM_DISCARDING_EXEC,
 154     PORT_STATE_TRANSITION_SM_DISCARDING,
 155     PORT_STATE_TRANSITION_SM_LEARNING_EXEC,
 156     PORT_STATE_TRANSITION_SM_LEARNING,
 157     PORT_STATE_TRANSITION_SM_FORWARDING_EXEC,
 158     PORT_STATE_TRANSITION_SM_FORWARDING
 159 };
 160 enum topology_change_state_machine {
 161     TOPOLOGY_CHANGE_SM_INIT,
 162     TOPOLOGY_CHANGE_SM_INACTIVE_EXEC,
 163     TOPOLOGY_CHANGE_SM_INACTIVE,
 164     TOPOLOGY_CHANGE_SM_LEARNING_EXEC,
 165     TOPOLOGY_CHANGE_SM_LEARNING,
 166     TOPOLOGY_CHANGE_SM_DETECTED_EXEC,
 167     TOPOLOGY_CHANGE_SM_ACTIVE_EXEC,
 168     TOPOLOGY_CHANGE_SM_ACTIVE,
 169     TOPOLOGY_CHANGE_SM_ACKNOWLEDGED_EXEC,
 170     TOPOLOGY_CHANGE_SM_PROPAGATING_EXEC,
 171     TOPOLOGY_CHANGE_SM_NOTIFIED_TC_EXEC,
 172     TOPOLOGY_CHANGE_SM_NOTIFIED_TCN_EXEC,
 173 };
 174
 175
 176 /* [17.18.4, 17.13, Table 17-1]. */
 177 struct rstp_times {
 178     /* [17.13.5 - Bridge Forward Delay] The delay (expressed in seconds) used
 179      * by STP Bridges (17.4) to transition Root and Designated Ports to
 180      * Forwarding (Table 17-1).
 181      * Default = 15.0 s. Values in range 4.0 - 30.0
 182      */
 183     uint16_t forward_delay;
 184
 185     /* [17.13.6 - Bridge Hello Time]
 186      * The interval between periodic transmissions of Configuration Messages
 187      * by Designated Ports (Table 17-1).
 188      * Default = 2.0 s. Fixed value
 189      */
 190     uint16_t hello_time;
 191
 192     /* [17.13.8 - Bridge Max Age]
 193      * The maximum age of the information transmitted by the Bridge when it is
 194      * the Root Bridge (Table 17-1).
 195      * Default = 20.0 s. Values in range 6.0 - 40.0 */
 196     uint16_t max_age;
 197
 198     uint16_t message_age;
 199 };
 200
 201 /* Priority vector [17.6] */
 202 struct rstp_priority_vector {
 203     rstp_identifier root_bridge_id;
 204     uint32_t root_path_cost;
 205     rstp_identifier designated_bridge_id;
 206     uint16_t designated_port_id;
 207     uint16_t bridge_port_id;
 208 };
 209
 210 enum rstp_bpdu_type {
 211     CONFIGURATION_BPDU = 0x0,
 212     TOPOLOGY_CHANGE_NOTIFICATION_BPDU = 0x80,
 213     RAPID_SPANNING_TREE_BPDU = 0x2
 214 };
 215
 216 enum rstp_bpdu_flag {
 217     BPDU_FLAG_TOPCHANGE = 0x01,
 218     BPDU_FLAG_PROPOSAL = 0x02,
 219     BPDU_FLAG_LEARNING = 0x10,
 220     BPDU_FLAG_FORWARDING = 0x20,
 221     BPDU_FLAG_AGREEMENT = 0x40,
 222     BPDU_FLAG_TOPCHANGEACK = 0x80
 223 };
 224
 225 /* Rapid Spanning Tree BPDU [9.3.3] */
 226 OVS_PACKED(
 227 struct rstp_bpdu {
 228     ovs_be16 protocol_identifier;
 229     uint8_t protocol_version_identifier;
 230     uint8_t bpdu_type;
 231     uint8_t flags;
 232     ovs_be64 root_bridge_id;
 233     ovs_be32 root_path_cost;
 234     ovs_be64 designated_bridge_id;
 235     ovs_be16 designated_port_id;
 236     ovs_be16 message_age;
 237     ovs_be16 max_age;
 238     ovs_be16 hello_time;
 239     ovs_be16 forward_delay;
 240     uint8_t version1_length;
 241 });
 242
 243 enum rstp_info_is {
 244     INFO_IS_DISABLED,
 245     INFO_IS_RECEIVED,
 246     INFO_IS_AGED,
 247     INFO_IS_MINE
 248 };
 249
 250 enum rstp_rcvd_info {
 251     SUPERIOR_DESIGNATED_INFO,
 252     REPEATED_DESIGNATED_INFO,
 253     INFERIOR_DESIGNATED_INFO,
 254     INFERIOR_ROOT_ALTERNATE_INFO,
 255     OTHER_INFO
 256 };
 257
 258 struct rstp_port {
 259     struct ovs_refcount ref_cnt;
 260
 261     struct rstp *rstp OVS_GUARDED_BY(rstp_mutex);
 262     struct hmap_node node OVS_GUARDED_BY(rstp_mutex); /* In rstp->ports. */
 263     void *aux OVS_GUARDED_BY(rstp_mutex);
 264     char *port_name;
 265     struct rstp_bpdu received_bpdu_buffer OVS_GUARDED_BY(rstp_mutex);
 266     /*************************************************************************
 267      * MAC status parameters
 268      ************************************************************************/
 269     /* [6.4.2 - MAC_Operational]
 270      * The value of this parameter is TRUE if [...] the MAC entity can be used
 271      * to transmit and/or receive frames, and its use is permitted by
 272      * management.
 273      */
 274     bool mac_operational OVS_GUARDED_BY(rstp_mutex);
 275
 276     /* [14.8.2.2] Administrative Bridge Port State */
 277     bool is_administrative_bridge_port OVS_GUARDED_BY(rstp_mutex);
 278
 279     /* [6.4.3 - operPointToPointMAC]
 280      *  a) True. The MAC is connected to a point-to-point LAN; i.e., there is
 281      *     at most one other system attached to the LAN.
 282      *  b) False. The MAC is connected to a non-point-to-point LAN; i.e.,
 283      *     there can be more than one other system attached to the LAN.
 284      *
 285      *  If adminPointToPointMAC is set to ForceTrue, then operPointToPointMAC
 286      *  shall be set True. If adminPointToPointMAC is set to ForceFalse, then
 287      *  operPointToPointMAC shall be set False.
 288      */
 289     bool oper_point_to_point_mac OVS_GUARDED_BY(rstp_mutex);
 290
 291     /* [6.4.3 - adminPointToPointMAC]
 292      *  a) ForceTrue. The administrator requires the MAC to be treated as if it
 293      *     is connected to a point-to-point LAN, regardless of any indications
 294      *     to the contrary that are generated by the MAC entity.
 295      *  b) ForceFalse. The administrator requires the MAC to be treated as
 296      *     connected to a non-point-to-point LAN, regardless of any indications
 297      *     to the contrary that are generated by the MAC entity.
 298      *  c) Auto. The administrator requires the point-to-point status of the
 299      *     MAC to be determined in accordance with the specific MAC procedures
 300      *     defined in 6.5.
 301      */
 302     enum rstp_admin_point_to_point_mac_state admin_point_to_point_mac OVS_GUARDED_BY(rstp_mutex);
 303
 304
 305     /*************************************************************************
 306      * [17.3 - RSTP performance parameters] Set by management actions on the
 307      * bridge
 308      *************************************************************************/
 309
 310     /* [17.13.1 - Admin Edge Port]
 311      * The AdminEdgePort parameter for the Port (14.8.2).
 312      */
 313     bool admin_edge OVS_GUARDED_BY(rstp_mutex);
 314
 315     /* [17.13.3 - AutoEdge]
 316      *  The AutoEdgePort parameter for the Port (14.8.2).
 317      */
 318     bool auto_edge OVS_GUARDED_BY(rstp_mutex);
 319
 320
 321     /*************************************************************************
 322      * The following variables are set by management actions on the bridge
 323      ************************************************************************/
 324
 325     /* Port number and priority
 326      * >=1 (max 12 bits [9.2.7])
 327      */
 328     uint16_t port_number OVS_GUARDED_BY(rstp_mutex);
 329
 330     /* Port priority
 331      * Range: 0-240 in steps of 16 (table 17-2)
 332      */
 333     uint8_t priority OVS_GUARDED_BY(rstp_mutex);
 334
 335     /* [17.13.11 - PortPathCost]
 336      * The Port's contribution, when it is the Root Port, to the Root Path Cost
 337      * (17.3.1, 17.5, 17.6) for the Bridge.
 338      */
 339     uint32_t port_path_cost OVS_GUARDED_BY(rstp_mutex);
 340
 341     /*************************************************************************
 342      * The following variables are defined in [17.17 - State machine timers]
 343      ************************************************************************/
 344     /* [17.17.1 - edgeDelayWhile]
 345      * The Edge Delay timer. The time remaining, in the absence of a received
 346      * BPDU, before this port is identified as an operEdgePort.
 347      */
 348     uint16_t edge_delay_while OVS_GUARDED_BY(rstp_mutex);
 349
 350     /* [17.17.2 - fdWhile]
 351      * The Forward Delay timer. Used to delay Port State transitions until
 352      * other Bridges have received spanning tree information.
 353      */
 354     uint16_t fd_while OVS_GUARDED_BY(rstp_mutex);
 355
 356     /* [17.17.3 - helloWhen]
 357      * The Hello timer. Used to ensure that at least one BPDU is transmitted by
 358      * a Designated Port in each HelloTime period.
 359      */
 360     uint16_t hello_when OVS_GUARDED_BY(rstp_mutex);
 361
 362     /* [17.17.4 - mdelayWhile]
 363      * The Migration Delay timer. Used by the Port Protocol Migration state
 364      * machine to allow time for another RSTP Bridge on the same LAN to
 365      * synchronize its migration state with this Port before the receipt of a
 366      * BPDU can cause this Port to change the BPDU types it transmits.
 367      * Initialized to MigrateTime (17.13.9).
 368      */
 369     uint16_t mdelay_while OVS_GUARDED_BY(rstp_mutex);
 370
 371     /* [17.17.5 - rbWhile]
 372      * The Recent Backup timer. Maintained at its initial value, twice
 373      * HelloTime, while the Port is a Backup Port.
 374      */
 375     uint16_t rb_while OVS_GUARDED_BY(rstp_mutex);
 376
 377     /* [17.17.6 - rcvdInfoWhile]
 378      * The Received Info timer. The time remaining before the spanning tree
 379      * information received by this Port [portPriority (17.19.21) and portTimes
 380      * (17.19.22)] is aged out if not refreshed by the receipt of a further
 381      * Configuration Message.
 382      */
 383     uint16_t rcvd_info_while OVS_GUARDED_BY(rstp_mutex);
 384
 385     /* [17.17.7 - rrWhile]
 386      * The Recent Root timer.
 387      */
 388     uint16_t rr_while OVS_GUARDED_BY(rstp_mutex);
 389
 390     /* [17.17.8 - tcWhile]
 391      * The Topology Change timer. TCN Messages are sent while this timer is
 392      * running.
 393      */
 394     uint16_t tc_while OVS_GUARDED_BY(rstp_mutex);
 395
 396
 397     /*************************************************************************
 398      * The following variables are defined in [17.19 - Per-Port variables]
 399      ************************************************************************/
 400
 401     /* [17.19.1 - ageingTime]
 402      * Filtering database entries for this Port are aged out after ageingTime
 403      * has elapsed since they were first created or refreshed by the Learning
 404      * Process.
 405      * The value of this parameter is normally Ageing Time (7.9.2, Table 7-5),
 406      * and is changed to FwdDelay (17.20.6) for a period of FwdDelay after
 407      * fdbFlush (17.19.7) is set by the topology change state machine if
 408      * stpVersion (17.19.7) is TRUE.
 409      */
 410     uint32_t ageing_time OVS_GUARDED_BY(rstp_mutex);
 411
 412     /* [17.19.2 - agree]
 413      * Set if synced is set for all other Ports. An RST BPDU with the Agreement
 414      * flag set is transmitted and proposed is reset when agree is first set,
 415      * and when proposed is set.
 416      * Initialized by Port Information state machine.
 417      */
 418     bool agree OVS_GUARDED_BY(rstp_mutex);
 419
 420     /* [17.19.3 - agreed]
 421      * Set when an RST BPDU is received with a Port Role of Root, Alternate, or
 422      * Backup Port, the Agreement flag set, and a message priority the same or
 423      * worse than the port priority. When agreed is set, the Designated Port
 424      * knows that its neighbouring Bridge has confirmed that it can proceed to
 425      * the Forwarding state without further delay.
 426      * Initialized by Port Information state machine.
 427      */
 428     bool agreed OVS_GUARDED_BY(rstp_mutex);
 429
 430     /* [17.19.4 - designatedPriority]
 431      * The first four components of the Port's designated priority vector
 432      * value, as defined in 17.6. The fifth component of the designated
 433      * priority vector value is portId (17.19.19).
 434      * (Fifth component of the structure must not be used)
 435      */
 436     struct rstp_priority_vector designated_priority_vector OVS_GUARDED_BY(rstp_mutex);
 437
 438     /* [17.19.5 - designatedTimes]
 439      * The designatedTimes variable comprises the set of timer parameter values
 440      * (Message Age, Max Age, Forward Delay, and Hello Time) that used to
 441      * update Port Times when updtInfo is set. Updated by the updtRolesTree()
 442      * procedure (17.21.25).
 443      */
 444     struct rstp_times designated_times OVS_GUARDED_BY(rstp_mutex);
 445
 446     /* [17.19.6 - disputed] */
 447     bool disputed OVS_GUARDED_BY(rstp_mutex);
 448
 449     /* [17.19.7 - fdbFlush]
 450      * A boolean. Set by the topology change state machine to instruct the
 451      * filtering database to remove all entries for this Port, immediately if
 452      * rstpVersion (17.20.11) is TRUE, or by rapid ageing (17.19.1) if
 453      * stpVersion (17.20.12) is TRUE. Reset by the filtering database once the
 454      * entries are
 455      * removed if rstpVersion is TRUE, and immediately if stpVersion is TRUE.
 456      */
 457     uint8_t fdb_flush OVS_GUARDED_BY(rstp_mutex);
 458
 459     /* [17.19.8 - forward]
 460      * Initialized by Port State Transition state machine.
 461      */
 462     bool forward OVS_GUARDED_BY(rstp_mutex);
 463
 464     /* [17.19.9 - forwarding]
 465      * Initialized by Port State Transition state machine.
 466      */
 467     bool forwarding OVS_GUARDED_BY(rstp_mutex);
 468
 469     /* [17.19.10 - infoIs]
 470      * A variable that takes the values Mine, Aged, Received, or Disabled, to
 471      * indicate the origin/state of the Port's Spanning Tree information
 472      * (portInfo) held for the Port, as follows:
 473      *  a) If infoIs is Received, the port has received current (not aged out)
 474      *     information from the Designated Bridge for the attached LAN (a
 475      *     point-to-point bridge link being a special case of a LAN).
 476      *  b) If infoIs is Mine, information for the port has been derived from
 477      *     the Root Port for the Bridge (with the addition of root port cost
 478      *     information). This includes the possibility that the Root Port is
 479      *     "Port 0," i.e., the bridge is the Root Bridge for the Bridged Local
 480      *     Area Network.
 481      *  c) If infoIs is Aged, information from the Root Bridge has been aged
 482      *     out. Just as for "reselect" (see 17.19.34), the state machine does
 483      *     not formally allow the "Aged" state to persist. However, if there is
 484      *     a delay in recomputing the new root port, correct processing of a
 485      *     received BPDU is specified.
 486      *  d) Finally if the port is disabled, infoIs is Disabled.
 487      */
 488     enum rstp_info_is info_is OVS_GUARDED_BY(rstp_mutex);
 489
 490     /* [17.19.11 - learn]
 491      * Initialized by Port State Transition state machine.
 492      */
 493     bool learn OVS_GUARDED_BY(rstp_mutex);
 494
 495     /* [17.19.12 - learning]
 496      * Initialized by Port State Transition state machine.
 497      */
 498     bool learning OVS_GUARDED_BY(rstp_mutex);
 499
 500     /* [17.19.13 - mcheck]
 501      * A boolean. May be set by management to force the Port Protocol Migration
 502      * state machine to transmit RST BPDUs for a MigrateTime (17.13.9) period,
 503      * to test whether all STP Bridges (17.4) on the attached LAN have been
 504      * removed and the Port can continue to transmit RSTP BPDUs. Setting mcheck
 505      * has no effect if stpVersion (17.20.12) is TRUE, i.e., the Bridge is
 506      * operating in STP Compatibility mode.
 507      */
 508     bool mcheck OVS_GUARDED_BY(rstp_mutex);
 509
 510     /* [17.19.14 - msgPriority]
 511      * The first four components of the message priority vector conveyed in a
 512      * received BPDU, as defined in 17.6.
 513      * (Fifth component of the structure must not be used).
 514      */
 515     struct rstp_priority_vector msg_priority OVS_GUARDED_BY(rstp_mutex);
 516
 517     /* [17.19.15 - msgTimes]
 518      * The msgTimes variable comprises the timer parameter values (Message Age,
 519      * Max Age, Forward Delay, and Hello Time) conveyed in a received BPDU.
 520      */
 521     struct rstp_times msg_times OVS_GUARDED_BY(rstp_mutex);
 522
 523     /* [17.19.16 - newInfo]
 524      * A boolean. Set if a BPDU is to be transmitted. Reset by the Port
 525      * Transmit state machine.
 526      */
 527     bool new_info OVS_GUARDED_BY(rstp_mutex);
 528
 529     /* [17.19.17 - operEdge]
 530      * A boolean. The value of the operEdgePort parameter, as determined by the
 531      * operation of the Bridge Detection state machine (17.25).
 532      */
 533     bool oper_edge OVS_GUARDED_BY(rstp_mutex);
 534
 535     /* [17.19.18 - portEnabled]
 536      * A boolean. Set if the Bridge's MAC Relay Entity and Spanning Tree
 537      * Protocol Entity can use the MAC Service provided by the Port's MAC
 538      * entity to transmit and receive frames to and from the attached LAN,
 539      * i.e., portEnabled is TRUE if and only if:
 540      *    a) MAC_Operational (6.4.2) is TRUE; and
 541      *    b) Administrative Bridge Port State (14.8.2.2) for the Port is
 542      *       Enabled; and
 543      *    c) AuthControlledPortStatus is Authorized [if the port is a network
 544      *       access port (IEEE Std 802.1X)].
 545      */
 546     bool port_enabled OVS_GUARDED_BY(rstp_mutex);
 547
 548     /* [17.19.19 - portId]
 549      * The Port Identifier. This variable forms the fifth component of the port
 550      * priority and designated priority vectors defined in 17.6.
 551      */
 552     uint16_t port_id OVS_GUARDED_BY(rstp_mutex);
 553
 554     /* [17.19.21 - portPriority]
 555      * The first four components of the Port's port priority vector value, as
 556      * defined in 17.6.
 557      * (Fifth component of the structure must not be used)
 558      */
 559     struct rstp_priority_vector port_priority OVS_GUARDED_BY(rstp_mutex);
 560
 561     /* [17.19.22 - portTimes]
 562      * The portTimes variable comprises the Port's timer parameter values
 563      * (Message Age, Max Age, Forward Delay, and Hello Time). These timer
 564      * values are used in BPDUs transmitted from the Port.
 565      */
 566     struct rstp_times port_times OVS_GUARDED_BY(rstp_mutex);
 567
 568     /* [17.19.23 - proposed]
 569      * Set when an RST BPDU with a Designated Port role and the Proposal flag
 570      * set is received. If agree is not set, proposed causes sync to be set for
 571      * all other Ports.of the Bridge.
 572      */
 573     bool proposed OVS_GUARDED_BY(rstp_mutex);
 574
 575     /* [17.19.24 - proposing]
 576      * Set by a Designated Port that is not Forwarding, and conveyed to the
 577      * Root Port or Alternate Port of a neighboring Bridge in the Proposal flag
 578      * of an RST BPDU (9.3.3).
 579      */
 580     bool proposing OVS_GUARDED_BY(rstp_mutex);
 581
 582     /* [17.19.25 - rcvdBPDU]
 583      * A boolean. Set by system dependent processes, this variable notifies the
 584      * Port Receive state machine (17.23) when a valid (9.3.4) Configuration,
 585      * TCN, or RST BPDU (9.3.1, 9.3.2, 9.3.3) is received on the Port. Reset
 586      * by the Port Receive state machine.
 587      */
 588     bool rcvd_bpdu OVS_GUARDED_BY(rstp_mutex);
 589
 590     /* [17.19.26 - rcvdInfo]
 591      * Set to the result of the rcvInfo() procedure (17.21.8).
 592      */
 593     enum rstp_rcvd_info rcvd_info OVS_GUARDED_BY(rstp_mutex);
 594
 595     /* [17.19.27 - rcvdMsg] */
 596     bool rcvd_msg OVS_GUARDED_BY(rstp_mutex);
 597
 598     /* [17.19.28 - rcvdRSTP] */
 599     bool rcvd_rstp OVS_GUARDED_BY(rstp_mutex);
 600
 601     /* [17.19.29 - rcvdSTP] */
 602     bool rcvd_stp OVS_GUARDED_BY(rstp_mutex);
 603
 604     /* [17.19.30 - rcvdTc] */
 605     bool rcvd_tc OVS_GUARDED_BY(rstp_mutex);
 606
 607     /* [17.19.31 - rcvdTcAck] */
 608     bool rcvd_tc_ack OVS_GUARDED_BY(rstp_mutex);
 609
 610     /* [17.19.32 - rcvdTcn] */
 611     bool rcvd_tcn OVS_GUARDED_BY(rstp_mutex);
 612
 613     /* [17.19.33 - reRoot] */
 614     bool re_root OVS_GUARDED_BY(rstp_mutex);
 615
 616     /* [17.19.34 - reselect] */
 617     bool reselect OVS_GUARDED_BY(rstp_mutex);
 618
 619     /* [17.19.35 - role]
 620      * The assigned Port Role (17.7).
 621      */
 622     enum rstp_port_role role OVS_GUARDED_BY(rstp_mutex);
 623
 624     /* [17.19.36 - selected]
 625      * A boolean. See 17.28, 17.21.16.
 626      */
 627     bool selected OVS_GUARDED_BY(rstp_mutex);
 628
 629     /* [17.19.37 - selectedRole]
 630      * The newly computed role for the Port (17.7, 17.28, 17.21.25, 17.19.35).
 631      */
 632     enum rstp_port_role selected_role OVS_GUARDED_BY(rstp_mutex);
 633
 634     /* [17.19.38 - sendRSTP]
 635      * A boolean. See 17.24, 17.26.
 636      */
 637     bool send_rstp OVS_GUARDED_BY(rstp_mutex);
 638
 639     /* [17.19.39 - sync]
 640      * A boolean. See 17.10.
 641      */
 642     bool sync OVS_GUARDED_BY(rstp_mutex);
 643
 644     /* [17.19.40 - synced]
 645      * A boolean. See 17.10.
 646      */
 647     bool synced OVS_GUARDED_BY(rstp_mutex);
 648
 649     /* [17.19.41 - tcAck]
 650      * A boolean. Set if a Configuration Message with a topology change
 651      * acknowledge flag set is to be transmitted.
 652      */
 653     bool tc_ack OVS_GUARDED_BY(rstp_mutex);
 654
 655     /* [17.19.42 - tcProp]
 656      * A boolean. Set by the Topology Change state machine of any other Port,
 657      * to indicate that a topology change should be propagated through this
 658      * Port.
 659      */
 660     bool tc_prop OVS_GUARDED_BY(rstp_mutex);
 661
 662     /* [17.19.43 - tick]
 663      * A boolean. See 17.22.
 664      */
 665     bool tick OVS_GUARDED_BY(rstp_mutex);
 666
 667     /* [17.19.44 - txCount]
 668      * A counter. Incremented by the Port Transmission (17.26) state machine on
 669      * every BPDU transmission, and decremented used by the Port Timers state
 670      * machine (17.22) once a second. Transmissions are delayed if txCount
 671      * reaches TxHoldCount (17.13.12).
 672      */
 673     uint16_t tx_count OVS_GUARDED_BY(rstp_mutex);
 674
 675     /* [17.19.45 - updtInfo]
 676      * A boolean. Set by the Port Role Selection state machine (17.28,
 677      * 17.21.25) to tell the Port Information state machine that it should copy
 678      * designatedPriority to portPriority and designatedTimes to portTimes.
 679      */
 680     bool updt_info OVS_GUARDED_BY(rstp_mutex);
 681
 682     /* Counter for RSTP received frames - for rstpd */
 683     uint32_t rx_rstp_bpdu_cnt;
 684
 685     /* Counter for bad RSTP received frames */
 686     uint32_t error_count OVS_GUARDED_BY(rstp_mutex);
 687
 688     /* [14.8.2.1.3] Outputs
 689      * a) Uptime count in seconds of the time elapsed since the Port was last
 690      *    reset or initialized.
 691      */
 692     uint32_t uptime OVS_GUARDED_BY(rstp_mutex);
 693
 694     enum rstp_state rstp_state OVS_GUARDED_BY(rstp_mutex);
 695     bool state_changed OVS_GUARDED_BY(rstp_mutex);
 696
 697     /* Per-port state machines state */
 698     enum port_receive_state_machine port_receive_sm_state OVS_GUARDED_BY(rstp_mutex);
 699     enum port_protocol_migration_state_machine port_protocol_migration_sm_state OVS_GUARDED_BY(rstp_mutex);
 700     enum bridge_detection_state_machine bridge_detection_sm_state OVS_GUARDED_BY(rstp_mutex);
 701     enum port_transmit_state_machine port_transmit_sm_state OVS_GUARDED_BY(rstp_mutex);
 702     enum port_information_state_machine port_information_sm_state OVS_GUARDED_BY(rstp_mutex);
 703     enum port_role_transition_state_machine port_role_transition_sm_state OVS_GUARDED_BY(rstp_mutex);
 704     enum port_state_transition_state_machine port_state_transition_sm_state OVS_GUARDED_BY(rstp_mutex);
 705     enum topology_change_state_machine topology_change_sm_state OVS_GUARDED_BY(rstp_mutex);
 706 };
 707
 708 struct rstp {
 709     struct ovs_list node OVS_GUARDED_BY(rstp_mutex);   /* In rstp instances list */
 710     char *name;     /* Bridge name. */
 711
 712     /* Changes in last SM execution. */
 713     bool changes OVS_GUARDED_BY(rstp_mutex);
 714
 715     /* Per-bridge state machines state */
 716     enum port_role_selection_state_machine port_role_selection_sm_state OVS_GUARDED_BY(rstp_mutex);
 717
 718     /* Bridge MAC address
 719      * (stored in the least significant 48 bits of rstp_identifier).
 720      */
 721     rstp_identifier address OVS_GUARDED_BY(rstp_mutex); /* [7.12.5] */
 722
 723     /* Bridge priority */
 724     uint16_t priority OVS_GUARDED_BY(rstp_mutex);      /* Valid values: 0-61440 in steps of 4096 */
 725
 726     /*************************************************************************
 727      * [17.3 - RSTP performance parameters]
 728      ************************************************************************/
 729
 730     /* [17.13]
 731      * The Spanning Tree Protocol Entity shall be reinitialized, as specified
 732      * by the assertion of BEGIN (17.18.1) in the state machine specification,
 733      * if the following parameters are modified:
 734      *  a) Force Protocol Version (17.13.4)
 735      *
 736      * The spanning tree priority vectors and Port Role assignments for a
 737      * Bridge shall be recomputed, as specified by the operation of the Port
 738      * Role Selection state machine (17.28) by clearing selected (17.19.36) and
 739      * setting reselect (17.19.34) for any Port or Ports for which the
 740      * following parameters are modified:
 741      *  b) Bridge Identifier Priority (17.13.7)
 742      *  c) Port Identifier Priority (17.13.10)
 743      *  d) Port Path Cost (17.13.11)
 744      *
 745      * If the Transmit Hold Count is modified the value of txCount (17.19.44)
 746      * for all Ports shall be set to zero.
 747      *
 748      * The RSTP specification permits changes in other performance parameters
 749      * without exceptional actions.
 750      */
 751
 752
 753     /* [17.13.2 - Ageing Time]
 754      * The Ageing Time parameter for the Bridge (7.9.2, Table 7-5).
 755      */
 756     uint32_t ageing_time OVS_GUARDED_BY(rstp_mutex);
 757
 758     /* [17.13.4 - Force Protocol Version]
 759      * The Force Protocol Version parameter for the Bridge (17.4, 14.8.1).
 760      * This can take the value 0 (STP Compatibility mode) or 2 (the default,
 761      * normal operation).
 762      */
 763     enum rstp_force_protocol_version force_protocol_version OVS_GUARDED_BY(rstp_mutex);
 764
 765     /* [17.13.5 - Bridge Forward Delay]
 766      *  The delay used by STP Bridges (17.4) to transition Root and Designated
 767      * Ports to Forwarding (Table 17-1).
 768      */
 769     uint16_t bridge_forward_delay OVS_GUARDED_BY(rstp_mutex);
 770
 771     /* [17.13.6 - Bridge Hello Time]
 772      *  The interval between periodic transmissions of Configuration Messages
 773      * by Designated Ports (Table 17-1).
 774      */
 775     uint16_t bridge_hello_time OVS_GUARDED_BY(rstp_mutex);
 776
 777     /* [17.13.8 - Bridge Max Age]
 778      * The maximum age of the information transmitted by the Bridge when it is
 779      * the Root Bridge (Table 17-1).
 780      */
 781     uint16_t bridge_max_age OVS_GUARDED_BY(rstp_mutex);
 782
 783     /* [17.13.9 - Migrate Time]
 784      * The initial value of the mdelayWhile and edgeDelayWhile timers (17.17.4,
 785      * 17.17.1), fixed for all RSTP implementations conforming to this
 786      * specification (Table 17-1).
 787      */
 788     uint16_t migrate_time OVS_GUARDED_BY(rstp_mutex);
 789
 790     /* [17.13.12 - Transmit Hold Count]
 791      * The Transmit Hold Count (Table 17-1) used by the Port Transmit state
 792      * machine to limit transmission rate.
 793      */
 794     uint16_t transmit_hold_count OVS_GUARDED_BY(rstp_mutex);
 795
 796
 797     /*************************************************************************
 798      * The following variables are defined in [17.18 - Per-Bridge variables]
 799      ************************************************************************/
 800
 801     /* [17.18.1 - BEGIN]
 802      * A Boolean controlled by the system initialization (17.16). If TRUE
 803      * causes all state machines, including per Port state machines, to
 804      * continuously execute their initial state.
 805      */
 806     bool begin OVS_GUARDED_BY(rstp_mutex);
 807
 808     /* [17.18.2 BridgeIdentifier]
 809      * The unique Bridge Identifier assigned to this Bridge, comprising two
 810      * components: the Bridge Identifier Priority, which may be modified by
 811      * management (see 9.2.5 and 14.8.1.2) and is the more significant when
 812      * Bridge Identifiers are compared, and a component derived from the Bridge
 813      * Address (7.12.5), which guarantees uniqueness of the Bridge Identifiers
 814      * of different Bridges.
 815      */
 816     rstp_identifier bridge_identifier OVS_GUARDED_BY(rstp_mutex);
 817
 818     /* [17.8.3 BridgePriority]
 819      * The bridge priority vector, as defined in 17.6. The first (RootBridgeID)
 820      * and third (DesignatedBridgeID) components are both equal to the value
 821      * of the Bridge Identifier (17.18.2). The other components are zero.
 822      */
 823     struct rstp_priority_vector bridge_priority OVS_GUARDED_BY(rstp_mutex);
 824
 825     /* [17.18.4 - BridgeTimes]
 826      * BridgeTimes comprises four components: the current values of Bridge
 827      * Forward Delay, Bridge Hello Time, Bridge Max Age (17.13, Table 17-1),
 828      * and a Message Age of zero.
 829      */
 830     struct rstp_times bridge_times OVS_GUARDED_BY(rstp_mutex);
 831
 832     /* [17.18.6 - rootPriority]
 833      * The first four components of the Bridge's root priority vector, as
 834      * defined in 17.6.
 835      */
 836     struct rstp_priority_vector root_priority OVS_GUARDED_BY(rstp_mutex);
 837
 838     /* [17.18.5 - rootPortId]
 839      * The Port Identifier of the Root Port. This is the fifth component of
 840      * the root priority vector, as defined in 17.6.
 841      */
 842     uint16_t root_port_id OVS_GUARDED_BY(rstp_mutex);
 843
 844     /* [17.18.7 - rootTimes]
 845      * The rootTimes variable comprises the Bridge's operational timer
 846      * parameter values (Message Age, Max Age, Forward Delay, and Hello Time),
 847      * derived from the values stored in portTimes (17.19.22) for the Root Port
 848      * or from BridgeTimes (17.18.4).
 849      */
 850     struct rstp_times root_times OVS_GUARDED_BY(rstp_mutex);
 851
 852     /* 17.20 State machine conditions and parameters */
 853
 854     /* [17.20.11] rstpVersion
 855      * TRUE if Force Protocol Version (17.13.4) is greater than or equal to 2.
 856      */
 857     bool rstp_version OVS_GUARDED_BY(rstp_mutex);
 858
 859     /* [17.20.12] stpVersion
 860      * TRUE if Force Protocol Version (17.13.4) is less than 2.
 861      */
 862     bool stp_version OVS_GUARDED_BY(rstp_mutex);
 863
 864     /* Ports */
 865     struct hmap ports OVS_GUARDED_BY(rstp_mutex);
 866
 867     struct ovs_refcount ref_cnt;
 868
 869     /* Interface to client. */
 870     void (*send_bpdu)(struct dp_packet *bpdu, void *port_aux, void *rstp_aux);
 871     void *aux;
 872
 873     bool root_changed;
 874     void *old_root_aux;
 875     void *new_root_aux;
 876 };
 877
 878 #endif /* rstp-common.h */