2 * Copyright (c) 2008, 2009, 2010 Nicira Networks.
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.
26 #include "openflow/openflow.h"
27 #include "poll-loop.h"
33 #define THIS_MODULE VLM_rconn
38 STATE(BACKOFF, 1 << 1) \
39 STATE(CONNECTING, 1 << 2) \
40 STATE(ACTIVE, 1 << 3) \
43 #define STATE(NAME, VALUE) S_##NAME = VALUE,
49 state_name(enum state state)
52 #define STATE(NAME, VALUE) case S_##NAME: return #NAME;
59 /* A reliable connection to an OpenFlow switch or controller.
61 * See the large comment in rconn.h for more information. */
74 time_t backoff_deadline;
76 time_t last_connected;
77 unsigned int packets_sent;
81 /* In S_ACTIVE and S_IDLE, probably_admitted reports whether we believe
82 * that the peer has made a (positive) admission control decision on our
83 * connection. If we have not yet been (probably) admitted, then the
84 * connection does not reset the timer used for deciding whether the switch
85 * should go into fail-open mode.
87 * last_admitted reports the last time we believe such a positive admission
88 * control decision was made. */
89 bool probably_admitted;
92 /* These values are simply for statistics reporting, not used directly by
93 * anything internal to the rconn (or ofproto for that matter). */
94 unsigned int packets_received;
95 unsigned int n_attempted_connections, n_successful_connections;
97 unsigned long int total_time_connected;
99 /* If we can't connect to the peer, it could be for any number of reasons.
100 * Usually, one would assume it is because the peer is not running or
101 * because the network is partitioned. But it could also be because the
102 * network topology has changed, in which case the upper layer will need to
103 * reassess it (in particular, obtain a new IP address via DHCP and find
104 * the new location of the controller). We set this flag when we suspect
105 * that this could be the case. */
106 bool questionable_connectivity;
107 time_t last_questioned;
109 /* Throughout this file, "probe" is shorthand for "inactivity probe".
110 * When nothing has been received from the peer for a while, we send out
111 * an echo request as an inactivity probe packet. We should receive back
113 int probe_interval; /* Secs of inactivity before sending probe. */
115 /* When we create a vconn we obtain these values, to save them past the end
116 * of the vconn's lifetime. Otherwise, in-band control will only allow
117 * traffic when a vconn is actually open, but it is nice to allow ARP to
118 * complete even between connection attempts, and it is also polite to
119 * allow traffic from other switches to go through to the controller
120 * whether or not we are connected.
122 * We don't cache the local port, because that changes from one connection
123 * attempt to the next. */
124 uint32_t local_ip, remote_ip;
125 uint16_t remote_port;
127 /* Messages sent or received are copied to the monitor connections. */
128 #define MAX_MONITORS 8
129 struct vconn *monitors[8];
133 static unsigned int elapsed_in_this_state(const struct rconn *);
134 static unsigned int timeout(const struct rconn *);
135 static bool timed_out(const struct rconn *);
136 static void state_transition(struct rconn *, enum state);
137 static void set_vconn_name(struct rconn *, const char *name);
138 static int try_send(struct rconn *);
139 static int reconnect(struct rconn *);
140 static void report_error(struct rconn *, int error);
141 static void disconnect(struct rconn *, int error);
142 static void flush_queue(struct rconn *);
143 static void question_connectivity(struct rconn *);
144 static void copy_to_monitor(struct rconn *, const struct ofpbuf *);
145 static bool is_connected_state(enum state);
146 static bool is_admitted_msg(const struct ofpbuf *);
148 /* Creates and returns a new rconn.
150 * 'probe_interval' is a number of seconds. If the interval passes once
151 * without an OpenFlow message being received from the peer, the rconn sends
152 * out an "echo request" message. If the interval passes again without a
153 * message being received, the rconn disconnects and re-connects to the peer.
154 * Setting 'probe_interval' to 0 disables this behavior.
156 * 'max_backoff' is the maximum number of seconds between attempts to connect
157 * to the peer. The actual interval starts at 1 second and doubles on each
158 * failure until it reaches 'max_backoff'. If 0 is specified, the default of
161 * The new rconn is initially unconnected. Use rconn_connect() or
162 * rconn_connect_unreliably() to connect it. */
164 rconn_create(int probe_interval, int max_backoff)
166 struct rconn *rc = xzalloc(sizeof *rc);
169 rc->state_entered = time_now();
172 rc->name = xstrdup("void");
173 rc->reliable = false;
175 queue_init(&rc->txq);
178 rc->max_backoff = max_backoff ? max_backoff : 8;
179 rc->backoff_deadline = TIME_MIN;
180 rc->last_received = time_now();
181 rc->last_connected = time_now();
184 rc->packets_sent = 0;
186 rc->probably_admitted = false;
187 rc->last_admitted = time_now();
189 rc->packets_received = 0;
190 rc->n_attempted_connections = 0;
191 rc->n_successful_connections = 0;
192 rc->creation_time = time_now();
193 rc->total_time_connected = 0;
195 rc->questionable_connectivity = false;
196 rc->last_questioned = time_now();
198 rconn_set_probe_interval(rc, probe_interval);
206 rconn_set_max_backoff(struct rconn *rc, int max_backoff)
208 rc->max_backoff = MAX(1, max_backoff);
209 if (rc->state == S_BACKOFF && rc->backoff > max_backoff) {
210 rc->backoff = max_backoff;
211 if (rc->backoff_deadline > time_now() + max_backoff) {
212 rc->backoff_deadline = time_now() + max_backoff;
218 rconn_get_max_backoff(const struct rconn *rc)
220 return rc->max_backoff;
224 rconn_set_probe_interval(struct rconn *rc, int probe_interval)
226 rc->probe_interval = probe_interval ? MAX(5, probe_interval) : 0;
230 rconn_get_probe_interval(const struct rconn *rc)
232 return rc->probe_interval;
236 rconn_connect(struct rconn *rc, const char *name)
238 rconn_disconnect(rc);
239 set_vconn_name(rc, name);
241 return reconnect(rc);
245 rconn_connect_unreliably(struct rconn *rc, struct vconn *vconn)
247 assert(vconn != NULL);
248 rconn_disconnect(rc);
249 set_vconn_name(rc, vconn_get_name(vconn));
250 rc->reliable = false;
252 rc->last_connected = time_now();
253 state_transition(rc, S_ACTIVE);
256 /* If 'rc' is connected, forces it to drop the connection and reconnect. */
258 rconn_reconnect(struct rconn *rc)
260 if (rc->state & (S_ACTIVE | S_IDLE)) {
261 VLOG_INFO("%s: disconnecting", rc->name);
267 rconn_disconnect(struct rconn *rc)
269 if (rc->state != S_VOID) {
271 vconn_close(rc->vconn);
274 set_vconn_name(rc, "void");
275 rc->reliable = false;
278 rc->backoff_deadline = TIME_MIN;
280 state_transition(rc, S_VOID);
284 /* Disconnects 'rc' and frees the underlying storage. */
286 rconn_destroy(struct rconn *rc)
292 vconn_close(rc->vconn);
294 queue_destroy(&rc->txq);
295 for (i = 0; i < rc->n_monitors; i++) {
296 vconn_close(rc->monitors[i]);
303 timeout_VOID(const struct rconn *rc OVS_UNUSED)
309 run_VOID(struct rconn *rc OVS_UNUSED)
315 reconnect(struct rconn *rc)
319 VLOG_INFO("%s: connecting...", rc->name);
320 rc->n_attempted_connections++;
321 retval = vconn_open(rc->name, OFP_VERSION, &rc->vconn);
323 rc->remote_ip = vconn_get_remote_ip(rc->vconn);
324 rc->local_ip = vconn_get_local_ip(rc->vconn);
325 rc->remote_port = vconn_get_remote_port(rc->vconn);
326 rc->backoff_deadline = time_now() + rc->backoff;
327 state_transition(rc, S_CONNECTING);
329 VLOG_WARN("%s: connection failed (%s)", rc->name, strerror(retval));
330 rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
331 disconnect(rc, retval);
337 timeout_BACKOFF(const struct rconn *rc)
343 run_BACKOFF(struct rconn *rc)
351 timeout_CONNECTING(const struct rconn *rc)
353 return MAX(1, rc->backoff);
357 run_CONNECTING(struct rconn *rc)
359 int retval = vconn_connect(rc->vconn);
361 VLOG_INFO("%s: connected", rc->name);
362 rc->n_successful_connections++;
363 state_transition(rc, S_ACTIVE);
364 rc->last_connected = rc->state_entered;
365 } else if (retval != EAGAIN) {
366 VLOG_INFO("%s: connection failed (%s)", rc->name, strerror(retval));
367 disconnect(rc, retval);
368 } else if (timed_out(rc)) {
369 VLOG_INFO("%s: connection timed out", rc->name);
370 rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
371 disconnect(rc, ETIMEDOUT);
376 do_tx_work(struct rconn *rc)
381 while (rc->txq.n > 0) {
382 int error = try_send(rc);
388 poll_immediate_wake();
393 timeout_ACTIVE(const struct rconn *rc)
395 if (rc->probe_interval) {
396 unsigned int base = MAX(rc->last_received, rc->state_entered);
397 unsigned int arg = base + rc->probe_interval - rc->state_entered;
404 run_ACTIVE(struct rconn *rc)
407 unsigned int base = MAX(rc->last_received, rc->state_entered);
408 VLOG_DBG("%s: idle %u seconds, sending inactivity probe",
409 rc->name, (unsigned int) (time_now() - base));
411 /* Ordering is important here: rconn_send() can transition to BACKOFF,
412 * and we don't want to transition back to IDLE if so, because then we
413 * can end up queuing a packet with vconn == NULL and then *boom*. */
414 state_transition(rc, S_IDLE);
415 rconn_send(rc, make_echo_request(), NULL);
423 timeout_IDLE(const struct rconn *rc)
425 return rc->probe_interval;
429 run_IDLE(struct rconn *rc)
432 question_connectivity(rc);
433 VLOG_ERR("%s: no response to inactivity probe after %u "
434 "seconds, disconnecting",
435 rc->name, elapsed_in_this_state(rc));
436 disconnect(rc, ETIMEDOUT);
442 /* Performs whatever activities are necessary to maintain 'rc': if 'rc' is
443 * disconnected, attempts to (re)connect, backing off as necessary; if 'rc' is
444 * connected, attempts to send packets in the send queue, if any. */
446 rconn_run(struct rconn *rc)
452 vconn_run(rc->vconn);
454 for (i = 0; i < rc->n_monitors; i++) {
455 vconn_run(rc->monitors[i]);
459 old_state = rc->state;
461 #define STATE(NAME, VALUE) case S_##NAME: run_##NAME(rc); break;
467 } while (rc->state != old_state);
470 /* Causes the next call to poll_block() to wake up when rconn_run() should be
473 rconn_run_wait(struct rconn *rc)
479 vconn_run_wait(rc->vconn);
481 for (i = 0; i < rc->n_monitors; i++) {
482 vconn_run_wait(rc->monitors[i]);
486 if (timeo != UINT_MAX) {
487 long long int expires = sat_add(rc->state_entered, timeo);
488 poll_timer_wait_until(expires * 1000);
491 if ((rc->state & (S_ACTIVE | S_IDLE)) && rc->txq.n) {
492 vconn_wait(rc->vconn, WAIT_SEND);
496 /* Attempts to receive a packet from 'rc'. If successful, returns the packet;
497 * otherwise, returns a null pointer. The caller is responsible for freeing
498 * the packet (with ofpbuf_delete()). */
500 rconn_recv(struct rconn *rc)
502 if (rc->state & (S_ACTIVE | S_IDLE)) {
503 struct ofpbuf *buffer;
504 int error = vconn_recv(rc->vconn, &buffer);
506 copy_to_monitor(rc, buffer);
507 if (rc->probably_admitted || is_admitted_msg(buffer)
508 || time_now() - rc->last_connected >= 30) {
509 rc->probably_admitted = true;
510 rc->last_admitted = time_now();
512 rc->last_received = time_now();
513 rc->packets_received++;
514 if (rc->state == S_IDLE) {
515 state_transition(rc, S_ACTIVE);
518 } else if (error != EAGAIN) {
519 report_error(rc, error);
520 disconnect(rc, error);
526 /* Causes the next call to poll_block() to wake up when a packet may be ready
527 * to be received by vconn_recv() on 'rc'. */
529 rconn_recv_wait(struct rconn *rc)
532 vconn_wait(rc->vconn, WAIT_RECV);
536 /* Sends 'b' on 'rc'. Returns 0 if successful (in which case 'b' is
537 * destroyed), or ENOTCONN if 'rc' is not currently connected (in which case
538 * the caller retains ownership of 'b').
540 * If 'counter' is non-null, then 'counter' will be incremented while the
541 * packet is in flight, then decremented when it has been sent (or discarded
542 * due to disconnection). Because 'b' may be sent (or discarded) before this
543 * function returns, the caller may not be able to observe any change in
546 * There is no rconn_send_wait() function: an rconn has a send queue that it
547 * takes care of sending if you call rconn_run(), which will have the side
548 * effect of waking up poll_block(). */
550 rconn_send(struct rconn *rc, struct ofpbuf *b,
551 struct rconn_packet_counter *counter)
553 if (rconn_is_connected(rc)) {
554 COVERAGE_INC(rconn_queued);
555 copy_to_monitor(rc, b);
556 b->private_p = counter;
558 rconn_packet_counter_inc(counter);
560 queue_push_tail(&rc->txq, b);
562 /* If the queue was empty before we added 'b', try to send some
563 * packets. (But if the queue had packets in it, it's because the
564 * vconn is backlogged and there's no point in stuffing more into it
565 * now. We'll get back to that in rconn_run().) */
566 if (rc->txq.n == 1) {
575 /* Sends 'b' on 'rc'. Increments 'counter' while the packet is in flight; it
576 * will be decremented when it has been sent (or discarded due to
577 * disconnection). Returns 0 if successful, EAGAIN if 'counter->n' is already
578 * at least as large as 'queue_limit', or ENOTCONN if 'rc' is not currently
579 * connected. Regardless of return value, 'b' is destroyed.
581 * Because 'b' may be sent (or discarded) before this function returns, the
582 * caller may not be able to observe any change in 'counter'.
584 * There is no rconn_send_wait() function: an rconn has a send queue that it
585 * takes care of sending if you call rconn_run(), which will have the side
586 * effect of waking up poll_block(). */
588 rconn_send_with_limit(struct rconn *rc, struct ofpbuf *b,
589 struct rconn_packet_counter *counter, int queue_limit)
592 retval = counter->n >= queue_limit ? EAGAIN : rconn_send(rc, b, counter);
594 COVERAGE_INC(rconn_overflow);
600 /* Returns the total number of packets successfully sent on the underlying
601 * vconn. A packet is not counted as sent while it is still queued in the
602 * rconn, only when it has been successfuly passed to the vconn. */
604 rconn_packets_sent(const struct rconn *rc)
606 return rc->packets_sent;
609 /* Adds 'vconn' to 'rc' as a monitoring connection, to which all messages sent
610 * and received on 'rconn' will be copied. 'rc' takes ownership of 'vconn'. */
612 rconn_add_monitor(struct rconn *rc, struct vconn *vconn)
614 if (rc->n_monitors < ARRAY_SIZE(rc->monitors)) {
615 VLOG_INFO("new monitor connection from %s", vconn_get_name(vconn));
616 rc->monitors[rc->n_monitors++] = vconn;
618 VLOG_DBG("too many monitor connections, discarding %s",
619 vconn_get_name(vconn));
624 /* Returns 'rc''s name (the 'name' argument passed to rconn_new()). */
626 rconn_get_name(const struct rconn *rc)
631 /* Returns true if 'rconn' is connected or in the process of reconnecting,
632 * false if 'rconn' is disconnected and will not reconnect on its own. */
634 rconn_is_alive(const struct rconn *rconn)
636 return rconn->state != S_VOID;
639 /* Returns true if 'rconn' is connected, false otherwise. */
641 rconn_is_connected(const struct rconn *rconn)
643 return is_connected_state(rconn->state);
646 /* Returns true if 'rconn' is connected and thought to have been accepted by
647 * the peer's admission-control policy. */
649 rconn_is_admitted(const struct rconn *rconn)
651 return (rconn_is_connected(rconn)
652 && rconn->last_admitted >= rconn->last_connected);
655 /* Returns 0 if 'rconn' is currently connected and considered to have been
656 * accepted by the peer's admission-control policy, otherwise the number of
657 * seconds since 'rconn' was last in such a state. */
659 rconn_failure_duration(const struct rconn *rconn)
661 return rconn_is_admitted(rconn) ? 0 : time_now() - rconn->last_admitted;
664 /* Returns the IP address of the peer, or 0 if the peer's IP address is not
667 rconn_get_remote_ip(const struct rconn *rconn)
669 return rconn->remote_ip;
672 /* Returns the transport port of the peer, or 0 if the peer's port is not
675 rconn_get_remote_port(const struct rconn *rconn)
677 return rconn->remote_port;
680 /* Returns the IP address used to connect to the peer, or 0 if the
681 * connection is not an IP-based protocol or if its IP address is not
684 rconn_get_local_ip(const struct rconn *rconn)
686 return rconn->local_ip;
689 /* Returns the transport port used to connect to the peer, or 0 if the
690 * connection does not contain a port or if the port is not known. */
692 rconn_get_local_port(const struct rconn *rconn)
694 return rconn->vconn ? vconn_get_local_port(rconn->vconn) : 0;
697 /* If 'rconn' can't connect to the peer, it could be for any number of reasons.
698 * Usually, one would assume it is because the peer is not running or because
699 * the network is partitioned. But it could also be because the network
700 * topology has changed, in which case the upper layer will need to reassess it
701 * (in particular, obtain a new IP address via DHCP and find the new location
702 * of the controller). When this appears that this might be the case, this
703 * function returns true. It also clears the questionability flag and prevents
704 * it from being set again for some time. */
706 rconn_is_connectivity_questionable(struct rconn *rconn)
708 bool questionable = rconn->questionable_connectivity;
709 rconn->questionable_connectivity = false;
713 /* Returns the total number of packets successfully received by the underlying
716 rconn_packets_received(const struct rconn *rc)
718 return rc->packets_received;
721 /* Returns a string representing the internal state of 'rc'. The caller must
722 * not modify or free the string. */
724 rconn_get_state(const struct rconn *rc)
726 return state_name(rc->state);
729 /* Returns the number of connection attempts made by 'rc', including any
730 * ongoing attempt that has not yet succeeded or failed. */
732 rconn_get_attempted_connections(const struct rconn *rc)
734 return rc->n_attempted_connections;
737 /* Returns the number of successful connection attempts made by 'rc'. */
739 rconn_get_successful_connections(const struct rconn *rc)
741 return rc->n_successful_connections;
744 /* Returns the time at which the last successful connection was made by
747 rconn_get_last_connection(const struct rconn *rc)
749 return rc->last_connected;
752 /* Returns the time at which the last OpenFlow message was received by 'rc'.
753 * If no packets have been received on 'rc', returns the time at which 'rc'
756 rconn_get_last_received(const struct rconn *rc)
758 return rc->last_received;
761 /* Returns the time at which 'rc' was created. */
763 rconn_get_creation_time(const struct rconn *rc)
765 return rc->creation_time;
768 /* Returns the approximate number of seconds that 'rc' has been connected. */
770 rconn_get_total_time_connected(const struct rconn *rc)
772 return (rc->total_time_connected
773 + (rconn_is_connected(rc) ? elapsed_in_this_state(rc) : 0));
776 /* Returns the current amount of backoff, in seconds. This is the amount of
777 * time after which the rconn will transition from BACKOFF to CONNECTING. */
779 rconn_get_backoff(const struct rconn *rc)
784 /* Returns the number of seconds spent in this state so far. */
786 rconn_get_state_elapsed(const struct rconn *rc)
788 return elapsed_in_this_state(rc);
791 /* Returns 'rc''s current connection sequence number, a number that changes
792 * every time that 'rconn' connects or disconnects. */
794 rconn_get_connection_seqno(const struct rconn *rc)
799 /* Returns a value that explains why 'rc' last disconnected:
801 * - 0 means that the last disconnection was caused by a call to
802 * rconn_disconnect(), or that 'rc' is new and has not yet completed its
803 * initial connection or connection attempt.
805 * - EOF means that the connection was closed in the normal way by the peer.
807 * - A positive integer is an errno value that represents the error.
810 rconn_get_last_error(const struct rconn *rc)
812 return rc->last_error;
815 struct rconn_packet_counter *
816 rconn_packet_counter_create(void)
818 struct rconn_packet_counter *c = xmalloc(sizeof *c);
825 rconn_packet_counter_destroy(struct rconn_packet_counter *c)
828 assert(c->ref_cnt > 0);
829 if (!--c->ref_cnt && !c->n) {
836 rconn_packet_counter_inc(struct rconn_packet_counter *c)
842 rconn_packet_counter_dec(struct rconn_packet_counter *c)
845 if (!--c->n && !c->ref_cnt) {
850 /* Set the name of the remote vconn to 'name' and clear out the cached IP
851 * address and port information, since changing the name also likely changes
854 set_vconn_name(struct rconn *rc, const char *name)
857 rc->name = xstrdup(name);
863 /* Tries to send a packet from 'rc''s send buffer. Returns 0 if successful,
864 * otherwise a positive errno value. */
866 try_send(struct rconn *rc)
869 struct ofpbuf *next = rc->txq.head->next;
870 struct rconn_packet_counter *counter = rc->txq.head->private_p;
871 retval = vconn_send(rc->vconn, rc->txq.head);
873 if (retval != EAGAIN) {
874 report_error(rc, retval);
875 disconnect(rc, retval);
879 COVERAGE_INC(rconn_sent);
882 rconn_packet_counter_dec(counter);
884 queue_advance_head(&rc->txq, next);
888 /* Reports that 'error' caused 'rc' to disconnect. 'error' may be a positive
889 * errno value, or it may be EOF to indicate that the connection was closed
892 report_error(struct rconn *rc, int error)
895 /* If 'rc' isn't reliable, then we don't really expect this connection
896 * to last forever anyway (probably it's a connection that we received
897 * via accept()), so use DBG level to avoid cluttering the logs. */
898 enum vlog_level level = rc->reliable ? VLL_INFO : VLL_DBG;
899 VLOG(level, "%s: connection closed by peer", rc->name);
901 VLOG_WARN("%s: connection dropped (%s)", rc->name, strerror(error));
905 /* Disconnects 'rc' and records 'error' as the error that caused 'rc''s last
908 * - 0 means that this disconnection is due to a request by 'rc''s client,
909 * not due to any kind of network error.
911 * - EOF means that the connection was closed in the normal way by the peer.
913 * - A positive integer is an errno value that represents the error.
916 disconnect(struct rconn *rc, int error)
918 rc->last_error = error;
920 time_t now = time_now();
922 if (rc->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) {
923 vconn_close(rc->vconn);
928 if (now >= rc->backoff_deadline) {
931 rc->backoff = MIN(rc->max_backoff, MAX(1, 2 * rc->backoff));
932 VLOG_INFO("%s: waiting %d seconds before reconnect\n",
933 rc->name, rc->backoff);
935 rc->backoff_deadline = now + rc->backoff;
936 state_transition(rc, S_BACKOFF);
937 if (now - rc->last_connected > 60) {
938 question_connectivity(rc);
941 rconn_disconnect(rc);
945 /* Drops all the packets from 'rc''s send queue and decrements their queue
948 flush_queue(struct rconn *rc)
953 while (rc->txq.n > 0) {
954 struct ofpbuf *b = queue_pop_head(&rc->txq);
955 struct rconn_packet_counter *counter = b->private_p;
957 rconn_packet_counter_dec(counter);
959 COVERAGE_INC(rconn_discarded);
962 poll_immediate_wake();
966 elapsed_in_this_state(const struct rconn *rc)
968 return time_now() - rc->state_entered;
972 timeout(const struct rconn *rc)
975 #define STATE(NAME, VALUE) case S_##NAME: return timeout_##NAME(rc);
984 timed_out(const struct rconn *rc)
986 return time_now() >= sat_add(rc->state_entered, timeout(rc));
990 state_transition(struct rconn *rc, enum state state)
992 rc->seqno += (rc->state == S_ACTIVE) != (state == S_ACTIVE);
993 if (is_connected_state(state) && !is_connected_state(rc->state)) {
994 rc->probably_admitted = false;
996 if (rconn_is_connected(rc)) {
997 rc->total_time_connected += elapsed_in_this_state(rc);
999 VLOG_DBG("%s: entering %s", rc->name, state_name(state));
1001 rc->state_entered = time_now();
1005 question_connectivity(struct rconn *rc)
1007 time_t now = time_now();
1008 if (now - rc->last_questioned > 60) {
1009 rc->questionable_connectivity = true;
1010 rc->last_questioned = now;
1015 copy_to_monitor(struct rconn *rc, const struct ofpbuf *b)
1017 struct ofpbuf *clone = NULL;
1021 for (i = 0; i < rc->n_monitors; ) {
1022 struct vconn *vconn = rc->monitors[i];
1025 clone = ofpbuf_clone(b);
1027 retval = vconn_send(vconn, clone);
1030 } else if (retval != EAGAIN) {
1031 VLOG_DBG("%s: closing monitor connection to %s: %s",
1032 rconn_get_name(rc), vconn_get_name(vconn),
1034 rc->monitors[i] = rc->monitors[--rc->n_monitors];
1039 ofpbuf_delete(clone);
1043 is_connected_state(enum state state)
1045 return (state & (S_ACTIVE | S_IDLE)) != 0;
1049 is_admitted_msg(const struct ofpbuf *b)
1051 struct ofp_header *oh = b->data;
1052 uint8_t type = oh->type;
1054 && (1u << type) & ((1u << OFPT_HELLO) |
1055 (1u << OFPT_ERROR) |
1056 (1u << OFPT_ECHO_REQUEST) |
1057 (1u << OFPT_ECHO_REPLY) |
1058 (1u << OFPT_VENDOR) |
1059 (1u << OFPT_FEATURES_REQUEST) |
1060 (1u << OFPT_FEATURES_REPLY) |
1061 (1u << OFPT_GET_CONFIG_REQUEST) |
1062 (1u << OFPT_GET_CONFIG_REPLY) |
1063 (1u << OFPT_SET_CONFIG)));