2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2016 Nicira, Inc.
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.
17 /* Based on sample implementation in 802.1D-1998. Above copyright and license
18 * applies to all modifications. */
23 #include <sys/types.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
28 #include "byte-order.h"
29 #include "connectivity.h"
30 #include "openvswitch/ofpbuf.h"
31 #include "ovs-atomic.h"
32 #include "dp-packet.h"
37 #include "openvswitch/vlog.h"
39 VLOG_DEFINE_THIS_MODULE(stp);
41 static struct vlog_rate_limit stp_rl = VLOG_RATE_LIMIT_INIT(60, 60);
43 #define STP_PROTOCOL_ID 0x0000
44 #define STP_PROTOCOL_VERSION 0x00
45 #define STP_TYPE_CONFIG 0x00
46 #define STP_TYPE_TCN 0x80
49 struct stp_bpdu_header {
50 ovs_be16 protocol_id; /* STP_PROTOCOL_ID. */
51 uint8_t protocol_version; /* STP_PROTOCOL_VERSION. */
52 uint8_t bpdu_type; /* One of STP_TYPE_*. */
54 BUILD_ASSERT_DECL(sizeof(struct stp_bpdu_header) == 4);
56 enum stp_config_bpdu_flags {
57 STP_CONFIG_TOPOLOGY_CHANGE_ACK = 0x80,
58 STP_CONFIG_TOPOLOGY_CHANGE = 0x01
62 struct stp_config_bpdu {
63 struct stp_bpdu_header header; /* Type STP_TYPE_CONFIG. */
64 uint8_t flags; /* STP_CONFIG_* flags. */
65 ovs_be64 root_id; /* 8.5.1.1: Bridge believed to be root. */
66 ovs_be32 root_path_cost; /* 8.5.1.2: Cost of path to root. */
67 ovs_be64 bridge_id; /* 8.5.1.3: ID of transmitting bridge. */
68 ovs_be16 port_id; /* 8.5.1.4: Port transmitting the BPDU. */
69 ovs_be16 message_age; /* 8.5.1.5: Age of BPDU at tx time. */
70 ovs_be16 max_age; /* 8.5.1.6: Timeout for received data. */
71 ovs_be16 hello_time; /* 8.5.1.7: Time between BPDU generation. */
72 ovs_be16 forward_delay; /* 8.5.1.8: State progression delay. */
74 BUILD_ASSERT_DECL(sizeof(struct stp_config_bpdu) == 35);
78 struct stp_bpdu_header header; /* Type STP_TYPE_TCN. */
80 BUILD_ASSERT_DECL(sizeof(struct stp_tcn_bpdu) == 4);
83 bool active; /* Timer in use? */
84 int value; /* Current value of timer, counting up. */
89 char *port_name; /* Human-readable name for log messages. */
90 void *aux; /* Auxiliary data the user may retrieve. */
91 int port_id; /* 8.5.5.1: Unique port identifier. */
92 enum stp_state state; /* 8.5.5.2: Current state. */
93 int path_cost; /* 8.5.5.3: Cost of tx/rx on this port. */
94 stp_identifier designated_root; /* 8.5.5.4. */
95 int designated_cost; /* 8.5.5.5: Path cost to root on port. */
96 stp_identifier designated_bridge; /* 8.5.5.6. */
97 int designated_port; /* 8.5.5.7: Port to send config msgs on. */
98 bool topology_change_ack; /* 8.5.5.8: Flag for next config BPDU. */
99 bool config_pending; /* 8.5.5.9: Send BPDU when hold expires? */
100 bool change_detection_enabled; /* 8.5.5.10: Detect topology changes? */
102 struct stp_timer message_age_timer; /* 8.5.6.1: Age of received info. */
103 struct stp_timer forward_delay_timer; /* 8.5.6.2: State change timer. */
104 struct stp_timer hold_timer; /* 8.5.6.3: BPDU rate limit timer. */
106 int tx_count; /* Number of BPDUs transmitted. */
107 int rx_count; /* Number of valid BPDUs received. */
108 int error_count; /* Number of bad BPDUs received. */
114 struct ovs_list node; /* Node in all_stps list. */
116 /* Static bridge data. */
117 char *name; /* Human-readable name for log messages. */
118 stp_identifier bridge_id; /* 8.5.3.7: This bridge. */
119 int max_age; /* 8.5.3.4: Time to drop received data. */
120 int hello_time; /* 8.5.3.5: Time between sending BPDUs. */
121 int forward_delay; /* 8.5.3.6: Delay between state changes. */
122 int bridge_max_age; /* 8.5.3.8: max_age when we're root. */
123 int bridge_hello_time; /* 8.5.3.9: hello_time as root. */
124 int bridge_forward_delay; /* 8.5.3.10: forward_delay as root. */
125 int rq_max_age; /* User-requested max age, in ms. */
126 int rq_hello_time; /* User-requested hello time, in ms. */
127 int rq_forward_delay; /* User-requested forward delay, in ms. */
128 int elapsed_remainder; /* Left-over msecs from last stp_tick(). */
130 /* Dynamic bridge data. */
131 stp_identifier designated_root; /* 8.5.3.1: Bridge believed to be root. */
132 unsigned int root_path_cost; /* 8.5.3.2: Cost of path to root. */
133 struct stp_port *root_port; /* 8.5.3.3: Lowest cost port to root. */
134 bool topology_change_detected; /* 8.5.3.11: Detected a topology change? */
135 bool topology_change; /* 8.5.3.12: Received topology change? */
138 struct stp_timer hello_timer; /* 8.5.4.1: Hello timer. */
139 struct stp_timer tcn_timer; /* 8.5.4.2: Topology change timer. */
140 struct stp_timer topology_change_timer; /* 8.5.4.3. */
143 struct stp_port ports[STP_MAX_PORTS];
145 /* Interface to client. */
146 bool fdb_needs_flush; /* MAC learning tables needs flushing. */
147 struct stp_port *first_changed_port;
148 void (*send_bpdu)(struct dp_packet *bpdu, int port_no, void *aux);
151 struct ovs_refcount ref_cnt;
154 static struct ovs_mutex mutex;
155 static struct ovs_list all_stps__ = OVS_LIST_INITIALIZER(&all_stps__);
156 static struct ovs_list *const all_stps OVS_GUARDED_BY(mutex) = &all_stps__;
158 #define FOR_EACH_ENABLED_PORT(PORT, STP) \
159 for ((PORT) = stp_next_enabled_port((STP), (STP)->ports); \
161 (PORT) = stp_next_enabled_port((STP), (PORT) + 1))
162 static struct stp_port *
163 stp_next_enabled_port(const struct stp *stp, const struct stp_port *port)
166 for (; port < &stp->ports[ARRAY_SIZE(stp->ports)]; port++) {
167 if (port->state != STP_DISABLED) {
168 return CONST_CAST(struct stp_port *, port);
174 #define MESSAGE_AGE_INCREMENT 1
176 static void stp_transmit_config(struct stp_port *) OVS_REQUIRES(mutex);
177 static bool stp_supersedes_port_info(const struct stp_port *,
178 const struct stp_config_bpdu *)
180 static void stp_record_config_information(struct stp_port *,
181 const struct stp_config_bpdu *)
183 static void stp_record_config_timeout_values(struct stp *,
184 const struct stp_config_bpdu *)
186 static bool stp_is_designated_port(const struct stp_port *)
188 static void stp_config_bpdu_generation(struct stp *) OVS_REQUIRES(mutex);
189 static void stp_transmit_tcn(struct stp *) OVS_REQUIRES(mutex);
190 static void stp_configuration_update(struct stp *) OVS_REQUIRES(mutex);
191 static bool stp_supersedes_root(const struct stp_port *root,
192 const struct stp_port *) OVS_REQUIRES(mutex);
193 static void stp_root_selection(struct stp *) OVS_REQUIRES(mutex);
194 static void stp_designated_port_selection(struct stp *) OVS_REQUIRES(mutex);
195 static void stp_become_designated_port(struct stp_port *)
197 static void stp_port_state_selection(struct stp *) OVS_REQUIRES(mutex);
198 static void stp_make_forwarding(struct stp_port *) OVS_REQUIRES(mutex);
199 static void stp_make_blocking(struct stp_port *) OVS_REQUIRES(mutex);
200 static void stp_set_port_state(struct stp_port *, enum stp_state)
202 static void stp_topology_change_detection(struct stp *) OVS_REQUIRES(mutex);
203 static void stp_topology_change_acknowledged(struct stp *)
205 static void stp_acknowledge_topology_change(struct stp_port *)
207 static void stp_received_config_bpdu(struct stp *, struct stp_port *,
208 const struct stp_config_bpdu *)
210 static void stp_received_tcn_bpdu(struct stp *, struct stp_port *)
212 static void stp_hello_timer_expiry(struct stp *) OVS_REQUIRES(mutex);
213 static void stp_message_age_timer_expiry(struct stp_port *)
215 static bool stp_is_designated_for_some_port(const struct stp *)
217 static void stp_forward_delay_timer_expiry(struct stp_port *)
219 static void stp_tcn_timer_expiry(struct stp *) OVS_REQUIRES(mutex);
220 static void stp_topology_change_timer_expiry(struct stp *)
222 static void stp_hold_timer_expiry(struct stp_port *) OVS_REQUIRES(mutex);
223 static void stp_initialize_port(struct stp_port *, enum stp_state)
225 static void stp_become_root_bridge(struct stp *) OVS_REQUIRES(mutex);
226 static void stp_update_bridge_timers(struct stp *) OVS_REQUIRES(mutex);
228 static int clamp(int x, int min, int max);
229 static int ms_to_timer(int ms);
230 static int timer_to_ms(int timer);
231 static void stp_start_timer(struct stp_timer *, int value);
232 static void stp_stop_timer(struct stp_timer *);
233 static bool stp_timer_expired(struct stp_timer *, int elapsed, int timeout);
235 static void stp_send_bpdu(struct stp_port *, const void *, size_t)
237 static void stp_unixctl_tcn(struct unixctl_conn *, int argc,
238 const char *argv[], void *aux);
243 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
245 if (ovsthread_once_start(&once)) {
246 /* We need a recursive mutex because stp_send_bpdu() could loop back
247 * into the stp module through a patch port. This happens
248 * intentionally as part of the unit tests. Ideally we'd ditch
249 * the call back function, but for now this is what we have. */
250 ovs_mutex_init_recursive(&mutex);
252 unixctl_command_register("stp/tcn", "[bridge]", 0, 1, stp_unixctl_tcn,
254 ovsthread_once_done(&once);
258 /* Creates and returns a new STP instance that initially has no ports enabled.
260 * 'bridge_id' should be a 48-bit MAC address as returned by
261 * eth_addr_to_uint64(). 'bridge_id' may also have a priority value in its top
262 * 16 bits; if those bits are set to 0, STP_DEFAULT_BRIDGE_PRIORITY is used.
263 * (This priority may be changed with stp_set_bridge_priority().)
265 * When the bridge needs to send out a BPDU, it calls 'send_bpdu'. This
266 * callback may be called from stp_tick() or stp_received_bpdu(). The
267 * arguments to 'send_bpdu' are an STP BPDU encapsulated in 'bpdu',
268 * the spanning tree port number 'port_no' that should transmit the
269 * packet, and auxiliary data to be passed to the callback in 'aux'.
272 stp_create(const char *name, stp_identifier bridge_id,
273 void (*send_bpdu)(struct dp_packet *bpdu, int port_no, void *aux),
281 ovs_mutex_lock(&mutex);
282 stp = xzalloc(sizeof *stp);
283 stp->name = xstrdup(name);
284 stp->bridge_id = bridge_id;
285 if (!(stp->bridge_id >> 48)) {
286 stp->bridge_id |= (uint64_t) STP_DEFAULT_BRIDGE_PRIORITY << 48;
289 stp->rq_max_age = STP_DEFAULT_MAX_AGE;
290 stp->rq_hello_time = STP_DEFAULT_HELLO_TIME;
291 stp->rq_forward_delay = STP_DEFAULT_FWD_DELAY;
292 stp_update_bridge_timers(stp);
293 stp->max_age = stp->bridge_max_age;
294 stp->hello_time = stp->bridge_hello_time;
295 stp->forward_delay = stp->bridge_forward_delay;
297 stp->designated_root = stp->bridge_id;
298 stp->root_path_cost = 0;
299 stp->root_port = NULL;
300 stp->topology_change_detected = false;
301 stp->topology_change = false;
303 stp_stop_timer(&stp->tcn_timer);
304 stp_stop_timer(&stp->topology_change_timer);
305 stp_start_timer(&stp->hello_timer, 0);
307 stp->send_bpdu = send_bpdu;
310 stp->first_changed_port = &stp->ports[ARRAY_SIZE(stp->ports)];
311 for (p = stp->ports; p < &stp->ports[ARRAY_SIZE(stp->ports)]; p++) {
313 p->port_id = (stp_port_no(p) + 1) | (STP_DEFAULT_PORT_PRIORITY << 8);
314 p->path_cost = 19; /* Recommended default for 100 Mb/s link. */
315 stp_initialize_port(p, STP_DISABLED);
317 ovs_refcount_init(&stp->ref_cnt);
319 ovs_list_push_back(all_stps, &stp->node);
320 ovs_mutex_unlock(&mutex);
325 stp_ref(const struct stp *stp_)
327 struct stp *stp = CONST_CAST(struct stp *, stp_);
329 ovs_refcount_ref(&stp->ref_cnt);
334 /* Destroys 'stp'. */
336 stp_unref(struct stp *stp)
338 if (stp && ovs_refcount_unref_relaxed(&stp->ref_cnt) == 1) {
341 ovs_mutex_lock(&mutex);
342 ovs_list_remove(&stp->node);
343 ovs_mutex_unlock(&mutex);
346 for (i = 0; i < STP_MAX_PORTS; i++) {
347 free(stp->ports[i].port_name);
353 /* Runs 'stp' given that 'ms' milliseconds have passed. */
355 stp_tick(struct stp *stp, int ms)
360 ovs_mutex_lock(&mutex);
361 /* Convert 'ms' to STP timer ticks. Preserve any leftover milliseconds
362 * from previous stp_tick() calls so that we don't lose STP ticks when we
363 * are called too frequently. */
364 ms = clamp(ms, 0, INT_MAX - 1000) + stp->elapsed_remainder;
365 elapsed = ms_to_timer(ms);
366 stp->elapsed_remainder = ms - timer_to_ms(elapsed);
371 if (stp_timer_expired(&stp->hello_timer, elapsed, stp->hello_time)) {
372 stp_hello_timer_expiry(stp);
374 if (stp_timer_expired(&stp->tcn_timer, elapsed, stp->bridge_hello_time)) {
375 stp_tcn_timer_expiry(stp);
377 if (stp_timer_expired(&stp->topology_change_timer, elapsed,
378 stp->max_age + stp->forward_delay)) {
379 stp_topology_change_timer_expiry(stp);
381 FOR_EACH_ENABLED_PORT (p, stp) {
382 if (stp_timer_expired(&p->message_age_timer, elapsed, stp->max_age)) {
383 stp_message_age_timer_expiry(p);
386 FOR_EACH_ENABLED_PORT (p, stp) {
387 if (stp_timer_expired(&p->forward_delay_timer, elapsed,
388 stp->forward_delay)) {
389 stp_forward_delay_timer_expiry(p);
391 if (stp_timer_expired(&p->hold_timer, elapsed, ms_to_timer(1000))) {
392 stp_hold_timer_expiry(p);
397 ovs_mutex_unlock(&mutex);
401 set_bridge_id(struct stp *stp, stp_identifier new_bridge_id)
404 if (new_bridge_id != stp->bridge_id) {
408 root = stp_is_root_bridge(stp);
409 FOR_EACH_ENABLED_PORT (p, stp) {
410 if (stp_is_designated_port(p)) {
411 p->designated_bridge = new_bridge_id;
414 stp->bridge_id = new_bridge_id;
415 stp_configuration_update(stp);
416 stp_port_state_selection(stp);
417 if (stp_is_root_bridge(stp) && !root) {
418 stp_become_root_bridge(stp);
424 stp_set_bridge_id(struct stp *stp, stp_identifier bridge_id)
426 const uint64_t mac_bits = (UINT64_C(1) << 48) - 1;
427 const uint64_t pri_bits = ~mac_bits;
428 ovs_mutex_lock(&mutex);
429 set_bridge_id(stp, (stp->bridge_id & pri_bits) | (bridge_id & mac_bits));
430 ovs_mutex_unlock(&mutex);
434 stp_set_bridge_priority(struct stp *stp, uint16_t new_priority)
436 const uint64_t mac_bits = (UINT64_C(1) << 48) - 1;
437 ovs_mutex_lock(&mutex);
438 set_bridge_id(stp, ((stp->bridge_id & mac_bits)
439 | ((uint64_t) new_priority << 48)));
440 ovs_mutex_unlock(&mutex);
443 /* Sets the desired hello time for 'stp' to 'ms', in milliseconds. The actual
444 * hello time is clamped to the range of 1 to 10 seconds and subject to the
445 * relationship (bridge_max_age >= 2 * (bridge_hello_time + 1 s)). The bridge
446 * hello time is only used when 'stp' is the root bridge. */
448 stp_set_hello_time(struct stp *stp, int ms)
450 ovs_mutex_lock(&mutex);
451 stp->rq_hello_time = ms;
452 stp_update_bridge_timers(stp);
453 ovs_mutex_unlock(&mutex);
456 /* Sets the desired max age for 'stp' to 'ms', in milliseconds. The actual max
457 * age is clamped to the range of 6 to 40 seconds and subject to the
458 * relationships (2 * (bridge_forward_delay - 1 s) >= bridge_max_age) and
459 * (bridge_max_age >= 2 * (bridge_hello_time + 1 s)). The bridge max age is
460 * only used when 'stp' is the root bridge. */
462 stp_set_max_age(struct stp *stp, int ms)
464 ovs_mutex_lock(&mutex);
465 stp->rq_max_age = ms;
466 stp_update_bridge_timers(stp);
467 ovs_mutex_unlock(&mutex);
470 /* Sets the desired forward delay for 'stp' to 'ms', in milliseconds. The
471 * actual forward delay is clamped to the range of 4 to 30 seconds and subject
472 * to the relationship (2 * (bridge_forward_delay - 1 s) >= bridge_max_age).
473 * The bridge forward delay is only used when 'stp' is the root bridge. */
475 stp_set_forward_delay(struct stp *stp, int ms)
477 ovs_mutex_lock(&mutex);
478 stp->rq_forward_delay = ms;
479 stp_update_bridge_timers(stp);
480 ovs_mutex_unlock(&mutex);
483 /* Returns the name given to 'stp' in the call to stp_create(). */
485 stp_get_name(const struct stp *stp)
489 ovs_mutex_lock(&mutex);
491 ovs_mutex_unlock(&mutex);
495 /* Returns the bridge ID for 'stp'. */
497 stp_get_bridge_id(const struct stp *stp)
499 stp_identifier bridge_id;
501 ovs_mutex_lock(&mutex);
502 bridge_id = stp->bridge_id;
503 ovs_mutex_unlock(&mutex);
507 /* Returns the bridge ID of the bridge currently believed to be the root. */
509 stp_get_designated_root(const struct stp *stp)
511 stp_identifier designated_root;
513 ovs_mutex_lock(&mutex);
514 designated_root = stp->designated_root;
515 ovs_mutex_unlock(&mutex);
516 return designated_root;
519 /* Returns true if 'stp' believes itself to the be root of the spanning tree,
520 * false otherwise. */
522 stp_is_root_bridge(const struct stp *stp)
526 ovs_mutex_lock(&mutex);
527 is_root = stp->bridge_id == stp->designated_root;
528 ovs_mutex_unlock(&mutex);
532 /* Returns the cost of the path from 'stp' to the root of the spanning tree. */
534 stp_get_root_path_cost(const struct stp *stp)
538 ovs_mutex_lock(&mutex);
539 cost = stp->root_path_cost;
540 ovs_mutex_unlock(&mutex);
544 /* Returns the bridge hello time, in ms. The returned value is not necessarily
545 * the value passed to stp_set_hello_time(): it is clamped to the valid range
546 * and quantized to the STP timer resolution. */
548 stp_get_hello_time(const struct stp *stp)
552 ovs_mutex_lock(&mutex);
553 time = timer_to_ms(stp->bridge_hello_time);
554 ovs_mutex_unlock(&mutex);
558 /* Returns the bridge max age, in ms. The returned value is not necessarily
559 * the value passed to stp_set_max_age(): it is clamped to the valid range,
560 * quantized to the STP timer resolution, and adjusted to match the constraints
561 * due to the hello time. */
563 stp_get_max_age(const struct stp *stp)
567 ovs_mutex_lock(&mutex);
568 time = timer_to_ms(stp->bridge_max_age);
569 ovs_mutex_unlock(&mutex);
573 /* Returns the bridge forward delay, in ms. The returned value is not
574 * necessarily the value passed to stp_set_forward_delay(): it is clamped to
575 * the valid range, quantized to the STP timer resolution, and adjusted to
576 * match the constraints due to the forward delay. */
578 stp_get_forward_delay(const struct stp *stp)
582 ovs_mutex_lock(&mutex);
583 time = timer_to_ms(stp->bridge_forward_delay);
584 ovs_mutex_unlock(&mutex);
588 /* Returns true if something has happened to 'stp' which necessitates flushing
589 * the client's MAC learning table. Calling this function resets 'stp' so that
590 * future calls will return false until flushing is required again. */
592 stp_check_and_reset_fdb_flush(struct stp *stp)
596 ovs_mutex_lock(&mutex);
597 needs_flush = stp->fdb_needs_flush;
598 stp->fdb_needs_flush = false;
599 ovs_mutex_unlock(&mutex);
603 /* Returns the port in 'stp' with index 'port_no', which must be between 0 and
606 stp_get_port(struct stp *stp, int port_no)
608 struct stp_port *port;
610 ovs_mutex_lock(&mutex);
611 ovs_assert(port_no >= 0 && port_no < ARRAY_SIZE(stp->ports));
612 port = &stp->ports[port_no];
613 ovs_mutex_unlock(&mutex);
617 /* Returns the port connecting 'stp' to the root bridge, or a null pointer if
618 * there is no such port. */
620 stp_get_root_port(struct stp *stp)
622 struct stp_port *port;
624 ovs_mutex_lock(&mutex);
625 port = stp->root_port;
626 ovs_mutex_unlock(&mutex);
630 /* Finds a port whose state has changed. If successful, stores the port whose
631 * state changed in '*portp' and returns true. If no port has changed, stores
632 * NULL in '*portp' and returns false. */
634 stp_get_changed_port(struct stp *stp, struct stp_port **portp)
636 struct stp_port *end, *p;
637 bool changed = false;
639 ovs_mutex_lock(&mutex);
640 end = &stp->ports[ARRAY_SIZE(stp->ports)];
641 for (p = stp->first_changed_port; p < end; p++) {
642 if (p->state_changed) {
643 p->state_changed = false;
644 stp->first_changed_port = p + 1;
650 stp->first_changed_port = end;
654 ovs_mutex_unlock(&mutex);
658 /* Returns the name for the given 'state' (for use in debugging and log
661 stp_state_name(enum stp_state state)
679 /* Returns true if 'state' is one in which packets received on a port should
680 * be forwarded, false otherwise.
683 stp_forward_in_state(enum stp_state state)
685 return (state & STP_FORWARDING) != 0;
688 /* Returns true if 'state' is one in which MAC learning should be done on
689 * packets received on a port, false otherwise.
692 stp_learn_in_state(enum stp_state state)
694 return (state & (STP_LEARNING | STP_FORWARDING)) != 0;
697 /* Returns true if 'state' is one in which bpdus should be forwarded on a
698 * port, false otherwise.
700 * Returns true if 'state' is STP_DISABLED, since in that case the port does
701 * not generate the bpdu and should just forward it (e.g. patch port on pif
704 stp_should_forward_bpdu(enum stp_state state)
707 ( STP_DISABLED | STP_LISTENING | STP_LEARNING
708 | STP_FORWARDING)) != 0;
711 /* Returns the name for the given 'role' (for use in debugging and log
714 stp_role_name(enum stp_role role)
719 case STP_ROLE_DESIGNATED:
721 case STP_ROLE_ALTERNATE:
723 case STP_ROLE_DISABLED:
730 /* Notifies the STP entity that bridge protocol data unit 'bpdu', which is
731 * 'bpdu_size' bytes in length, was received on port 'p'.
733 * This function may call the 'send_bpdu' function provided to stp_create(). */
735 stp_received_bpdu(struct stp_port *p, const void *bpdu, size_t bpdu_size)
737 struct stp *stp = p->stp;
738 const struct stp_bpdu_header *header;
740 ovs_mutex_lock(&mutex);
741 if (p->state == STP_DISABLED) {
745 if (bpdu_size < sizeof(struct stp_bpdu_header)) {
746 VLOG_WARN("%s: received runt %"PRIuSIZE"-byte BPDU", stp->name, bpdu_size);
752 if (header->protocol_id != htons(STP_PROTOCOL_ID)) {
753 VLOG_WARN("%s: received BPDU with unexpected protocol ID %"PRIu16,
754 stp->name, ntohs(header->protocol_id));
758 if (header->protocol_version != STP_PROTOCOL_VERSION) {
759 VLOG_DBG("%s: received BPDU with unexpected protocol version %"PRIu8,
760 stp->name, header->protocol_version);
763 switch (header->bpdu_type) {
764 case STP_TYPE_CONFIG:
765 if (bpdu_size < sizeof(struct stp_config_bpdu)) {
766 VLOG_WARN("%s: received config BPDU with invalid size %"PRIuSIZE,
767 stp->name, bpdu_size);
771 stp_received_config_bpdu(stp, p, bpdu);
775 if (bpdu_size != sizeof(struct stp_tcn_bpdu)) {
776 VLOG_WARN("%s: received TCN BPDU with invalid size %"PRIuSIZE,
777 stp->name, bpdu_size);
781 stp_received_tcn_bpdu(stp, p);
785 VLOG_WARN("%s: received BPDU of unexpected type %"PRIu8,
786 stp->name, header->bpdu_type);
793 ovs_mutex_unlock(&mutex);
796 /* Returns the STP entity in which 'p' is nested. */
798 stp_port_get_stp(struct stp_port *p)
802 ovs_mutex_lock(&mutex);
804 ovs_mutex_unlock(&mutex);
809 stp_port_set_name(struct stp_port *p, const char *name)
813 ovs_mutex_lock(&mutex);
815 p->port_name = xstrdup(name);
817 ovs_mutex_unlock(&mutex);
820 /* Sets the 'aux' member of 'p'.
822 * The 'aux' member will be reset to NULL when stp_port_disable() is
823 * called or stp_port_enable() is called when the port is in a Disabled
826 stp_port_set_aux(struct stp_port *p, void *aux)
828 ovs_mutex_lock(&mutex);
830 ovs_mutex_unlock(&mutex);
833 /* Returns the 'aux' member of 'p'. */
835 stp_port_get_aux(struct stp_port *p)
839 ovs_mutex_lock(&mutex);
841 ovs_mutex_unlock(&mutex);
845 /* Returns the index of port 'p' within its bridge. */
847 stp_port_no(const struct stp_port *p)
852 ovs_mutex_lock(&mutex);
854 ovs_assert(p >= stp->ports && p < &stp->ports[ARRAY_SIZE(stp->ports)]);
855 index = p - p->stp->ports;
856 ovs_mutex_unlock(&mutex);
860 /* Returns the port ID for 'p'. */
862 stp_port_get_id(const struct stp_port *p)
866 ovs_mutex_lock(&mutex);
867 port_id = p->port_id;
868 ovs_mutex_unlock(&mutex);
872 /* Returns the state of port 'p'. */
874 stp_port_get_state(const struct stp_port *p)
876 enum stp_state state;
878 ovs_mutex_lock(&mutex);
880 ovs_mutex_unlock(&mutex);
884 /* Returns the role of port 'p'. */
886 stp_port_get_role(const struct stp_port *p)
888 struct stp_port *root_port;
891 ovs_mutex_lock(&mutex);
892 root_port = p->stp->root_port;
893 if (root_port && root_port->port_id == p->port_id) {
894 role = STP_ROLE_ROOT;
895 } else if (stp_is_designated_port(p)) {
896 role = STP_ROLE_DESIGNATED;
897 } else if (p->state == STP_DISABLED) {
898 role = STP_ROLE_DISABLED;
900 role = STP_ROLE_ALTERNATE;
902 ovs_mutex_unlock(&mutex);
906 /* Retrieves BPDU transmit and receive counts for 'p'. */
908 stp_port_get_counts(const struct stp_port *p,
909 int *tx_count, int *rx_count, int *error_count)
911 ovs_mutex_lock(&mutex);
912 *tx_count = p->tx_count;
913 *rx_count = p->rx_count;
914 *error_count = p->error_count;
915 ovs_mutex_unlock(&mutex);
918 /* Disables STP on port 'p'. */
920 stp_port_disable(struct stp_port *p)
924 ovs_mutex_lock(&mutex);
926 if (p->state != STP_DISABLED) {
927 bool root = stp_is_root_bridge(stp);
928 stp_become_designated_port(p);
929 stp_set_port_state(p, STP_DISABLED);
930 p->topology_change_ack = false;
931 p->config_pending = false;
932 stp_stop_timer(&p->message_age_timer);
933 stp_stop_timer(&p->forward_delay_timer);
934 stp_configuration_update(stp);
935 stp_port_state_selection(stp);
936 if (stp_is_root_bridge(stp) && !root) {
937 stp_become_root_bridge(stp);
941 ovs_mutex_unlock(&mutex);
944 /* Enables STP on port 'p'. The port will initially be in "blocking" state. */
946 stp_port_enable(struct stp_port *p)
948 ovs_mutex_lock(&mutex);
949 if (p->state == STP_DISABLED) {
950 stp_initialize_port(p, STP_BLOCKING);
951 stp_port_state_selection(p->stp);
953 ovs_mutex_unlock(&mutex);
956 /* Sets the priority of port 'p' to 'new_priority'. Lower numerical values
957 * are interpreted as higher priorities. */
959 stp_port_set_priority(struct stp_port *p, uint8_t new_priority)
961 uint16_t new_port_id;
963 ovs_mutex_lock(&mutex);
964 new_port_id = (p->port_id & 0xff) | (new_priority << 8);
965 if (p->port_id != new_port_id) {
966 struct stp *stp = p->stp;
967 if (stp_is_designated_port(p)) {
968 p->designated_port = new_port_id;
970 p->port_id = new_port_id;
971 if (stp->bridge_id == p->designated_bridge
972 && p->port_id < p->designated_port) {
973 stp_become_designated_port(p);
974 stp_port_state_selection(stp);
977 ovs_mutex_unlock(&mutex);
980 /* Convert 'speed' (measured in Mb/s) into the path cost. */
982 stp_convert_speed_to_cost(unsigned int speed)
986 ovs_mutex_lock(&mutex);
987 ret = speed >= 10000 ? 2 /* 10 Gb/s. */
988 : speed >= 1000 ? 4 /* 1 Gb/s. */
989 : speed >= 100 ? 19 /* 100 Mb/s. */
990 : speed >= 16 ? 62 /* 16 Mb/s. */
991 : speed >= 10 ? 100 /* 10 Mb/s. */
992 : speed >= 4 ? 250 /* 4 Mb/s. */
993 : 19; /* 100 Mb/s (guess). */
994 ovs_mutex_unlock(&mutex);
998 /* Sets the path cost of port 'p' to 'path_cost'. Lower values are generally
999 * used to indicate faster links. Use stp_port_set_speed() to automatically
1000 * generate a default path cost from a link speed. */
1002 stp_port_set_path_cost(struct stp_port *p, uint16_t path_cost)
1004 ovs_mutex_lock(&mutex);
1005 if (p->path_cost != path_cost) {
1006 struct stp *stp = p->stp;
1007 p->path_cost = path_cost;
1008 stp_configuration_update(stp);
1009 stp_port_state_selection(stp);
1011 ovs_mutex_unlock(&mutex);
1014 /* Sets the path cost of port 'p' based on 'speed' (measured in Mb/s). */
1016 stp_port_set_speed(struct stp_port *p, unsigned int speed)
1018 stp_port_set_path_cost(p, stp_convert_speed_to_cost(speed));
1021 /* Enables topology change detection on port 'p'. */
1023 stp_port_enable_change_detection(struct stp_port *p)
1025 p->change_detection_enabled = true;
1028 /* Disables topology change detection on port 'p'. */
1030 stp_port_disable_change_detection(struct stp_port *p)
1032 p->change_detection_enabled = false;
1036 stp_transmit_config(struct stp_port *p) OVS_REQUIRES(mutex)
1038 struct stp *stp = p->stp;
1039 bool root = stp_is_root_bridge(stp);
1040 if (!root && !stp->root_port) {
1043 if (p->hold_timer.active) {
1044 VLOG_DBG_RL(&stp_rl, "bridge: %s, port: %s, transmit config bpdu pending",
1045 stp->name, p->port_name);
1046 p->config_pending = true;
1048 struct stp_config_bpdu config;
1049 memset(&config, 0, sizeof config);
1050 config.header.protocol_id = htons(STP_PROTOCOL_ID);
1051 config.header.protocol_version = STP_PROTOCOL_VERSION;
1052 config.header.bpdu_type = STP_TYPE_CONFIG;
1054 if (p->topology_change_ack) {
1055 config.flags |= STP_CONFIG_TOPOLOGY_CHANGE_ACK;
1057 if (stp->topology_change) {
1058 config.flags |= STP_CONFIG_TOPOLOGY_CHANGE;
1060 config.root_id = htonll(stp->designated_root);
1061 config.root_path_cost = htonl(stp->root_path_cost);
1062 config.bridge_id = htonll(stp->bridge_id);
1063 config.port_id = htons(p->port_id);
1065 config.message_age = htons(0);
1067 config.message_age = htons(stp->root_port->message_age_timer.value
1068 + MESSAGE_AGE_INCREMENT);
1070 config.max_age = htons(stp->max_age);
1071 config.hello_time = htons(stp->hello_time);
1072 config.forward_delay = htons(stp->forward_delay);
1073 if (ntohs(config.message_age) < stp->max_age) {
1074 p->topology_change_ack = false;
1075 p->config_pending = false;
1076 VLOG_DBG_RL(&stp_rl, "bridge: %s, port: %s, transmit config bpdu",
1077 stp->name, p->port_name);
1078 stp_send_bpdu(p, &config, sizeof config);
1079 stp_start_timer(&p->hold_timer, 0);
1085 stp_supersedes_port_info(const struct stp_port *p,
1086 const struct stp_config_bpdu *config)
1089 if (ntohll(config->root_id) != p->designated_root) {
1090 return ntohll(config->root_id) < p->designated_root;
1091 } else if (ntohl(config->root_path_cost) != p->designated_cost) {
1092 return ntohl(config->root_path_cost) < p->designated_cost;
1093 } else if (ntohll(config->bridge_id) != p->designated_bridge) {
1094 return ntohll(config->bridge_id) < p->designated_bridge;
1096 return (ntohll(config->bridge_id) != p->stp->bridge_id
1097 || ntohs(config->port_id) <= p->designated_port);
1102 stp_record_config_information(struct stp_port *p,
1103 const struct stp_config_bpdu *config)
1106 p->designated_root = ntohll(config->root_id);
1107 p->designated_cost = ntohl(config->root_path_cost);
1108 p->designated_bridge = ntohll(config->bridge_id);
1109 p->designated_port = ntohs(config->port_id);
1110 stp_start_timer(&p->message_age_timer, ntohs(config->message_age));
1114 stp_record_config_timeout_values(struct stp *stp,
1115 const struct stp_config_bpdu *config)
1118 stp->max_age = ntohs(config->max_age);
1119 stp->hello_time = ntohs(config->hello_time);
1120 stp->forward_delay = ntohs(config->forward_delay);
1121 stp->topology_change = config->flags & STP_CONFIG_TOPOLOGY_CHANGE;
1125 stp_is_designated_port(const struct stp_port *p) OVS_REQUIRES(mutex)
1127 return (p->designated_bridge == p->stp->bridge_id
1128 && p->designated_port == p->port_id);
1132 stp_config_bpdu_generation(struct stp *stp) OVS_REQUIRES(mutex)
1136 FOR_EACH_ENABLED_PORT (p, stp) {
1137 if (stp_is_designated_port(p)) {
1138 stp_transmit_config(p);
1144 stp_transmit_tcn(struct stp *stp) OVS_REQUIRES(mutex)
1146 struct stp_port *p = stp->root_port;
1147 struct stp_tcn_bpdu tcn_bpdu;
1152 VLOG_DBG_RL(&stp_rl, "bridge: %s, root port: %s, transmit tcn", stp->name,
1154 tcn_bpdu.header.protocol_id = htons(STP_PROTOCOL_ID);
1155 tcn_bpdu.header.protocol_version = STP_PROTOCOL_VERSION;
1156 tcn_bpdu.header.bpdu_type = STP_TYPE_TCN;
1157 stp_send_bpdu(p, &tcn_bpdu, sizeof tcn_bpdu);
1161 stp_configuration_update(struct stp *stp) OVS_REQUIRES(mutex)
1163 stp_root_selection(stp);
1164 stp_designated_port_selection(stp);
1165 seq_change(connectivity_seq_get());
1169 stp_supersedes_root(const struct stp_port *root, const struct stp_port *p)
1172 int p_cost = p->designated_cost + p->path_cost;
1173 int root_cost = root->designated_cost + root->path_cost;
1175 if (p->designated_root != root->designated_root) {
1176 return p->designated_root < root->designated_root;
1177 } else if (p_cost != root_cost) {
1178 return p_cost < root_cost;
1179 } else if (p->designated_bridge != root->designated_bridge) {
1180 return p->designated_bridge < root->designated_bridge;
1181 } else if (p->designated_port != root->designated_port) {
1182 return p->designated_port < root->designated_port;
1184 return p->port_id < root->port_id;
1189 stp_root_selection(struct stp *stp) OVS_REQUIRES(mutex)
1191 struct stp_port *p, *root;
1194 FOR_EACH_ENABLED_PORT (p, stp) {
1195 if (stp_is_designated_port(p)
1196 || p->designated_root >= stp->bridge_id) {
1199 if (root && !stp_supersedes_root(root, p)) {
1204 stp->root_port = root;
1206 stp->designated_root = stp->bridge_id;
1207 stp->root_path_cost = 0;
1209 stp->designated_root = root->designated_root;
1210 stp->root_path_cost = root->designated_cost + root->path_cost;
1215 stp_designated_port_selection(struct stp *stp) OVS_REQUIRES(mutex)
1219 FOR_EACH_ENABLED_PORT (p, stp) {
1220 if (stp_is_designated_port(p)
1221 || p->designated_root != stp->designated_root
1222 || stp->root_path_cost < p->designated_cost
1223 || (stp->root_path_cost == p->designated_cost
1224 && (stp->bridge_id < p->designated_bridge
1225 || (stp->bridge_id == p->designated_bridge
1226 && p->port_id <= p->designated_port))))
1228 stp_become_designated_port(p);
1234 stp_become_designated_port(struct stp_port *p) OVS_REQUIRES(mutex)
1236 struct stp *stp = p->stp;
1237 p->designated_root = stp->designated_root;
1238 p->designated_cost = stp->root_path_cost;
1239 p->designated_bridge = stp->bridge_id;
1240 p->designated_port = p->port_id;
1244 stp_port_state_selection(struct stp *stp) OVS_REQUIRES(mutex)
1248 FOR_EACH_ENABLED_PORT (p, stp) {
1249 if (p == stp->root_port) {
1250 p->config_pending = false;
1251 p->topology_change_ack = false;
1252 stp_make_forwarding(p);
1253 } else if (stp_is_designated_port(p)) {
1254 stp_stop_timer(&p->message_age_timer);
1255 stp_make_forwarding(p);
1257 p->config_pending = false;
1258 p->topology_change_ack = false;
1259 stp_make_blocking(p);
1265 stp_make_forwarding(struct stp_port *p) OVS_REQUIRES(mutex)
1267 if (p->state == STP_BLOCKING) {
1268 stp_set_port_state(p, STP_LISTENING);
1269 stp_start_timer(&p->forward_delay_timer, 0);
1274 stp_make_blocking(struct stp_port *p) OVS_REQUIRES(mutex)
1276 if (!(p->state & (STP_DISABLED | STP_BLOCKING))) {
1277 if (p->state & (STP_FORWARDING | STP_LEARNING)) {
1278 if (p->change_detection_enabled) {
1279 stp_topology_change_detection(p->stp);
1282 stp_set_port_state(p, STP_BLOCKING);
1283 stp_stop_timer(&p->forward_delay_timer);
1288 stp_set_port_state(struct stp_port *p, enum stp_state state)
1291 if (state != p->state && !p->state_changed) {
1292 p->state_changed = true;
1293 if (p < p->stp->first_changed_port) {
1294 p->stp->first_changed_port = p;
1296 seq_change(connectivity_seq_get());
1302 stp_topology_change_detection(struct stp *stp) OVS_REQUIRES(mutex)
1304 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
1306 if (stp_is_root_bridge(stp)) {
1307 stp->topology_change = true;
1308 stp_start_timer(&stp->topology_change_timer, 0);
1309 } else if (!stp->topology_change_detected) {
1310 stp_transmit_tcn(stp);
1311 stp_start_timer(&stp->tcn_timer, 0);
1313 stp->fdb_needs_flush = true;
1314 stp->topology_change_detected = true;
1315 seq_change(connectivity_seq_get());
1316 VLOG_INFO_RL(&rl, "%s: detected topology change.", stp->name);
1320 stp_topology_change_acknowledged(struct stp *stp) OVS_REQUIRES(mutex)
1322 stp->topology_change_detected = false;
1323 stp_stop_timer(&stp->tcn_timer);
1327 stp_acknowledge_topology_change(struct stp_port *p) OVS_REQUIRES(mutex)
1329 p->topology_change_ack = true;
1330 stp_transmit_config(p);
1334 stp_received_config_bpdu(struct stp *stp, struct stp_port *p,
1335 const struct stp_config_bpdu *config)
1338 if (ntohs(config->message_age) >= ntohs(config->max_age)) {
1339 VLOG_WARN("%s: received config BPDU with message age (%u) greater "
1340 "than max age (%u)",
1342 ntohs(config->message_age), ntohs(config->max_age));
1345 if (p->state != STP_DISABLED) {
1346 bool root = stp_is_root_bridge(stp);
1347 if (stp_supersedes_port_info(p, config)) {
1348 stp_record_config_information(p, config);
1349 stp_configuration_update(stp);
1350 stp_port_state_selection(stp);
1351 if (!stp_is_root_bridge(stp) && root) {
1352 stp_stop_timer(&stp->hello_timer);
1353 if (stp->topology_change_detected) {
1354 stp_stop_timer(&stp->topology_change_timer);
1355 stp_transmit_tcn(stp);
1356 stp_start_timer(&stp->tcn_timer, 0);
1359 if (p == stp->root_port) {
1360 stp_record_config_timeout_values(stp, config);
1361 stp_config_bpdu_generation(stp);
1362 if (config->flags & STP_CONFIG_TOPOLOGY_CHANGE_ACK) {
1363 stp_topology_change_acknowledged(stp);
1365 if (config->flags & STP_CONFIG_TOPOLOGY_CHANGE) {
1366 stp->fdb_needs_flush = true;
1369 } else if (stp_is_designated_port(p)) {
1370 stp_transmit_config(p);
1376 stp_received_tcn_bpdu(struct stp *stp, struct stp_port *p)
1379 if (p->state != STP_DISABLED) {
1380 if (stp_is_designated_port(p)) {
1381 stp_topology_change_detection(stp);
1382 stp_acknowledge_topology_change(p);
1388 stp_hello_timer_expiry(struct stp *stp) OVS_REQUIRES(mutex)
1390 stp_config_bpdu_generation(stp);
1391 stp_start_timer(&stp->hello_timer, 0);
1395 stp_message_age_timer_expiry(struct stp_port *p) OVS_REQUIRES(mutex)
1397 struct stp *stp = p->stp;
1398 bool root = stp_is_root_bridge(stp);
1400 VLOG_DBG_RL(&stp_rl, "bridge: %s, port: %s, message age timer expired",
1401 stp->name, p->port_name);
1402 stp_become_designated_port(p);
1403 stp_configuration_update(stp);
1404 stp_port_state_selection(stp);
1405 if (stp_is_root_bridge(stp) && !root) {
1406 stp->max_age = stp->bridge_max_age;
1407 stp->hello_time = stp->bridge_hello_time;
1408 stp->forward_delay = stp->bridge_forward_delay;
1409 stp_topology_change_detection(stp);
1410 stp_stop_timer(&stp->tcn_timer);
1411 stp_config_bpdu_generation(stp);
1412 stp_start_timer(&stp->hello_timer, 0);
1417 stp_is_designated_for_some_port(const struct stp *stp) OVS_REQUIRES(mutex)
1419 const struct stp_port *p;
1421 FOR_EACH_ENABLED_PORT (p, stp) {
1422 if (p->designated_bridge == stp->bridge_id) {
1430 stp_forward_delay_timer_expiry(struct stp_port *p) OVS_REQUIRES(mutex)
1432 if (p->state == STP_LISTENING) {
1433 stp_set_port_state(p, STP_LEARNING);
1434 stp_start_timer(&p->forward_delay_timer, 0);
1435 } else if (p->state == STP_LEARNING) {
1436 stp_set_port_state(p, STP_FORWARDING);
1437 if (stp_is_designated_for_some_port(p->stp)) {
1438 if (p->change_detection_enabled) {
1439 stp_topology_change_detection(p->stp);
1446 stp_tcn_timer_expiry(struct stp *stp) OVS_REQUIRES(mutex)
1448 stp_transmit_tcn(stp);
1449 stp_start_timer(&stp->tcn_timer, 0);
1453 stp_topology_change_timer_expiry(struct stp *stp) OVS_REQUIRES(mutex)
1455 stp->topology_change_detected = false;
1456 stp->topology_change = false;
1460 stp_hold_timer_expiry(struct stp_port *p) OVS_REQUIRES(mutex)
1462 if (p->config_pending) {
1463 stp_transmit_config(p);
1468 stp_initialize_port(struct stp_port *p, enum stp_state state)
1471 ovs_assert(state & (STP_DISABLED | STP_BLOCKING));
1472 stp_become_designated_port(p);
1474 if (!p->state && state == STP_DISABLED) {
1475 p->state = state; /* Do not trigger state change when initializing. */
1477 stp_set_port_state(p, state);
1479 p->topology_change_ack = false;
1480 p->config_pending = false;
1481 p->change_detection_enabled = true;
1483 stp_stop_timer(&p->message_age_timer);
1484 stp_stop_timer(&p->forward_delay_timer);
1485 stp_stop_timer(&p->hold_timer);
1486 p->tx_count = p->rx_count = p->error_count = 0;
1490 stp_become_root_bridge(struct stp *stp) OVS_REQUIRES(mutex)
1492 stp->max_age = stp->bridge_max_age;
1493 stp->hello_time = stp->bridge_hello_time;
1494 stp->forward_delay = stp->bridge_forward_delay;
1495 stp_topology_change_detection(stp);
1496 stp_stop_timer(&stp->tcn_timer);
1497 stp_config_bpdu_generation(stp);
1498 stp_start_timer(&stp->hello_timer, 0);
1502 stp_start_timer(struct stp_timer *timer, int value) OVS_REQUIRES(mutex)
1504 timer->value = value;
1505 timer->active = true;
1509 stp_stop_timer(struct stp_timer *timer) OVS_REQUIRES(mutex)
1511 timer->active = false;
1515 stp_timer_expired(struct stp_timer *timer, int elapsed, int timeout)
1518 if (timer->active) {
1519 timer->value += elapsed;
1520 if (timer->value >= timeout) {
1521 timer->active = false;
1528 /* Returns the number of whole STP timer ticks in 'ms' milliseconds. There
1529 * are 256 STP timer ticks per second. */
1533 return ms * 0x100 / 1000;
1536 /* Returns the number of whole milliseconds in 'timer' STP timer ticks. There
1537 * are 256 STP timer ticks per second. */
1539 timer_to_ms(int timer)
1541 return timer * 1000 / 0x100;
1545 clamp(int x, int min, int max)
1547 return x < min ? min : x > max ? max : x;
1551 stp_update_bridge_timers(struct stp *stp) OVS_REQUIRES(mutex)
1555 ht = clamp(stp->rq_hello_time, 1000, 10000);
1556 ma = clamp(stp->rq_max_age, MAX(2 * (ht + 1000), 6000), 40000);
1557 fd = clamp(stp->rq_forward_delay, ma / 2 + 1000, 30000);
1559 stp->bridge_hello_time = ms_to_timer(ht);
1560 stp->bridge_max_age = ms_to_timer(ma);
1561 stp->bridge_forward_delay = ms_to_timer(fd);
1563 if (stp_is_root_bridge(stp)) {
1564 stp->max_age = stp->bridge_max_age;
1565 stp->hello_time = stp->bridge_hello_time;
1566 stp->forward_delay = stp->bridge_forward_delay;
1571 stp_send_bpdu(struct stp_port *p, const void *bpdu, size_t bpdu_size)
1574 struct eth_header *eth;
1575 struct llc_header *llc;
1576 struct dp_packet *pkt;
1579 pkt = dp_packet_new(ETH_HEADER_LEN + LLC_HEADER_LEN + bpdu_size);
1580 eth = dp_packet_put_zeros(pkt, sizeof *eth);
1581 llc = dp_packet_put_zeros(pkt, sizeof *llc);
1582 dp_packet_reset_offsets(pkt);
1583 dp_packet_set_l3(pkt, dp_packet_put(pkt, bpdu, bpdu_size));
1586 eth->eth_dst = eth_addr_stp;
1587 /* p->stp->send_bpdu() must fill in source address. */
1588 eth->eth_type = htons(dp_packet_size(pkt) - ETH_HEADER_LEN);
1591 llc->llc_dsap = STP_LLC_DSAP;
1592 llc->llc_ssap = STP_LLC_SSAP;
1593 llc->llc_cntl = STP_LLC_CNTL;
1595 p->stp->send_bpdu(pkt, stp_port_no(p), p->stp->aux);
1602 stp_find(const char *name) OVS_REQUIRES(mutex)
1606 LIST_FOR_EACH (stp, node, all_stps) {
1607 if (!strcmp(stp->name, name)) {
1615 stp_unixctl_tcn(struct unixctl_conn *conn, int argc,
1616 const char *argv[], void *aux OVS_UNUSED)
1618 ovs_mutex_lock(&mutex);
1620 struct stp *stp = stp_find(argv[1]);
1623 unixctl_command_reply_error(conn, "no such stp object");
1626 stp_topology_change_detection(stp);
1630 LIST_FOR_EACH (stp, node, all_stps) {
1631 stp_topology_change_detection(stp);
1635 unixctl_command_reply(conn, "OK");
1638 ovs_mutex_unlock(&mutex);