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 a new rconn, connects it (reliably) to 'name', and returns it. */
150 rconn_new(const char *name, int inactivity_probe_interval, int max_backoff)
152 struct rconn *rc = rconn_create(inactivity_probe_interval, max_backoff);
153 rconn_connect(rc, name);
157 /* Creates a new rconn, connects it (unreliably) to 'vconn', and returns it. */
159 rconn_new_from_vconn(const char *name, struct vconn *vconn)
161 struct rconn *rc = rconn_create(60, 0);
162 rconn_connect_unreliably(rc, name, vconn);
166 /* Creates and returns a new rconn.
168 * 'probe_interval' is a number of seconds. If the interval passes once
169 * without an OpenFlow message being received from the peer, the rconn sends
170 * out an "echo request" message. If the interval passes again without a
171 * message being received, the rconn disconnects and re-connects to the peer.
172 * Setting 'probe_interval' to 0 disables this behavior.
174 * 'max_backoff' is the maximum number of seconds between attempts to connect
175 * to the peer. The actual interval starts at 1 second and doubles on each
176 * failure until it reaches 'max_backoff'. If 0 is specified, the default of
177 * 8 seconds is used. */
179 rconn_create(int probe_interval, int max_backoff)
181 struct rconn *rc = xzalloc(sizeof *rc);
184 rc->state_entered = time_now();
187 rc->name = xstrdup("void");
188 rc->reliable = false;
190 queue_init(&rc->txq);
193 rc->max_backoff = max_backoff ? max_backoff : 8;
194 rc->backoff_deadline = TIME_MIN;
195 rc->last_received = time_now();
196 rc->last_connected = time_now();
199 rc->packets_sent = 0;
201 rc->probably_admitted = false;
202 rc->last_admitted = time_now();
204 rc->packets_received = 0;
205 rc->n_attempted_connections = 0;
206 rc->n_successful_connections = 0;
207 rc->creation_time = time_now();
208 rc->total_time_connected = 0;
210 rc->questionable_connectivity = false;
211 rc->last_questioned = time_now();
213 rconn_set_probe_interval(rc, probe_interval);
221 rconn_set_max_backoff(struct rconn *rc, int max_backoff)
223 rc->max_backoff = MAX(1, max_backoff);
224 if (rc->state == S_BACKOFF && rc->backoff > max_backoff) {
225 rc->backoff = max_backoff;
226 if (rc->backoff_deadline > time_now() + max_backoff) {
227 rc->backoff_deadline = time_now() + max_backoff;
233 rconn_get_max_backoff(const struct rconn *rc)
235 return rc->max_backoff;
239 rconn_set_probe_interval(struct rconn *rc, int probe_interval)
241 rc->probe_interval = probe_interval ? MAX(5, probe_interval) : 0;
245 rconn_get_probe_interval(const struct rconn *rc)
247 return rc->probe_interval;
251 rconn_connect(struct rconn *rc, const char *name)
253 rconn_disconnect(rc);
254 set_vconn_name(rc, name);
256 return reconnect(rc);
260 rconn_connect_unreliably(struct rconn *rc,
261 const char *name, struct vconn *vconn)
263 assert(vconn != NULL);
264 rconn_disconnect(rc);
265 set_vconn_name(rc, name);
266 rc->reliable = false;
268 rc->last_connected = time_now();
269 state_transition(rc, S_ACTIVE);
272 /* If 'rc' is connected, forces it to drop the connection and reconnect. */
274 rconn_reconnect(struct rconn *rc)
276 if (rc->state & (S_ACTIVE | S_IDLE)) {
277 VLOG_INFO("%s: disconnecting", rc->name);
283 rconn_disconnect(struct rconn *rc)
285 if (rc->state != S_VOID) {
287 vconn_close(rc->vconn);
290 set_vconn_name(rc, "void");
291 rc->reliable = false;
294 rc->backoff_deadline = TIME_MIN;
296 state_transition(rc, S_VOID);
300 /* Disconnects 'rc' and frees the underlying storage. */
302 rconn_destroy(struct rconn *rc)
308 vconn_close(rc->vconn);
310 queue_destroy(&rc->txq);
311 for (i = 0; i < rc->n_monitors; i++) {
312 vconn_close(rc->monitors[i]);
319 timeout_VOID(const struct rconn *rc OVS_UNUSED)
325 run_VOID(struct rconn *rc OVS_UNUSED)
331 reconnect(struct rconn *rc)
335 VLOG_INFO("%s: connecting...", rc->name);
336 rc->n_attempted_connections++;
337 retval = vconn_open(rc->name, OFP_VERSION, &rc->vconn);
339 rc->remote_ip = vconn_get_remote_ip(rc->vconn);
340 rc->local_ip = vconn_get_local_ip(rc->vconn);
341 rc->remote_port = vconn_get_remote_port(rc->vconn);
342 rc->backoff_deadline = time_now() + rc->backoff;
343 state_transition(rc, S_CONNECTING);
345 VLOG_WARN("%s: connection failed (%s)", rc->name, strerror(retval));
346 rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
347 disconnect(rc, retval);
353 timeout_BACKOFF(const struct rconn *rc)
359 run_BACKOFF(struct rconn *rc)
367 timeout_CONNECTING(const struct rconn *rc)
369 return MAX(1, rc->backoff);
373 run_CONNECTING(struct rconn *rc)
375 int retval = vconn_connect(rc->vconn);
377 VLOG_INFO("%s: connected", rc->name);
378 rc->n_successful_connections++;
379 state_transition(rc, S_ACTIVE);
380 rc->last_connected = rc->state_entered;
381 } else if (retval != EAGAIN) {
382 VLOG_INFO("%s: connection failed (%s)", rc->name, strerror(retval));
383 disconnect(rc, retval);
384 } else if (timed_out(rc)) {
385 VLOG_INFO("%s: connection timed out", rc->name);
386 rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
387 disconnect(rc, ETIMEDOUT);
392 do_tx_work(struct rconn *rc)
397 while (rc->txq.n > 0) {
398 int error = try_send(rc);
404 poll_immediate_wake();
409 timeout_ACTIVE(const struct rconn *rc)
411 if (rc->probe_interval) {
412 unsigned int base = MAX(rc->last_received, rc->state_entered);
413 unsigned int arg = base + rc->probe_interval - rc->state_entered;
420 run_ACTIVE(struct rconn *rc)
423 unsigned int base = MAX(rc->last_received, rc->state_entered);
424 VLOG_DBG("%s: idle %u seconds, sending inactivity probe",
425 rc->name, (unsigned int) (time_now() - base));
427 /* Ordering is important here: rconn_send() can transition to BACKOFF,
428 * and we don't want to transition back to IDLE if so, because then we
429 * can end up queuing a packet with vconn == NULL and then *boom*. */
430 state_transition(rc, S_IDLE);
431 rconn_send(rc, make_echo_request(), NULL);
439 timeout_IDLE(const struct rconn *rc)
441 return rc->probe_interval;
445 run_IDLE(struct rconn *rc)
448 question_connectivity(rc);
449 VLOG_ERR("%s: no response to inactivity probe after %u "
450 "seconds, disconnecting",
451 rc->name, elapsed_in_this_state(rc));
452 disconnect(rc, ETIMEDOUT);
458 /* Performs whatever activities are necessary to maintain 'rc': if 'rc' is
459 * disconnected, attempts to (re)connect, backing off as necessary; if 'rc' is
460 * connected, attempts to send packets in the send queue, if any. */
462 rconn_run(struct rconn *rc)
468 vconn_run(rc->vconn);
470 for (i = 0; i < rc->n_monitors; i++) {
471 vconn_run(rc->monitors[i]);
475 old_state = rc->state;
477 #define STATE(NAME, VALUE) case S_##NAME: run_##NAME(rc); break;
483 } while (rc->state != old_state);
486 /* Causes the next call to poll_block() to wake up when rconn_run() should be
489 rconn_run_wait(struct rconn *rc)
495 vconn_run_wait(rc->vconn);
497 for (i = 0; i < rc->n_monitors; i++) {
498 vconn_run_wait(rc->monitors[i]);
502 if (timeo != UINT_MAX) {
503 long long int expires = sat_add(rc->state_entered, timeo);
504 poll_timer_wait_until(expires * 1000);
507 if ((rc->state & (S_ACTIVE | S_IDLE)) && rc->txq.n) {
508 vconn_wait(rc->vconn, WAIT_SEND);
512 /* Attempts to receive a packet from 'rc'. If successful, returns the packet;
513 * otherwise, returns a null pointer. The caller is responsible for freeing
514 * the packet (with ofpbuf_delete()). */
516 rconn_recv(struct rconn *rc)
518 if (rc->state & (S_ACTIVE | S_IDLE)) {
519 struct ofpbuf *buffer;
520 int error = vconn_recv(rc->vconn, &buffer);
522 copy_to_monitor(rc, buffer);
523 if (rc->probably_admitted || is_admitted_msg(buffer)
524 || time_now() - rc->last_connected >= 30) {
525 rc->probably_admitted = true;
526 rc->last_admitted = time_now();
528 rc->last_received = time_now();
529 rc->packets_received++;
530 if (rc->state == S_IDLE) {
531 state_transition(rc, S_ACTIVE);
534 } else if (error != EAGAIN) {
535 report_error(rc, error);
536 disconnect(rc, error);
542 /* Causes the next call to poll_block() to wake up when a packet may be ready
543 * to be received by vconn_recv() on 'rc'. */
545 rconn_recv_wait(struct rconn *rc)
548 vconn_wait(rc->vconn, WAIT_RECV);
552 /* Sends 'b' on 'rc'. Returns 0 if successful (in which case 'b' is
553 * destroyed), or ENOTCONN if 'rc' is not currently connected (in which case
554 * the caller retains ownership of 'b').
556 * If 'counter' is non-null, then 'counter' will be incremented while the
557 * packet is in flight, then decremented when it has been sent (or discarded
558 * due to disconnection). Because 'b' may be sent (or discarded) before this
559 * function returns, the caller may not be able to observe any change in
562 * There is no rconn_send_wait() function: an rconn has a send queue that it
563 * takes care of sending if you call rconn_run(), which will have the side
564 * effect of waking up poll_block(). */
566 rconn_send(struct rconn *rc, struct ofpbuf *b,
567 struct rconn_packet_counter *counter)
569 if (rconn_is_connected(rc)) {
570 COVERAGE_INC(rconn_queued);
571 copy_to_monitor(rc, b);
572 b->private_p = counter;
574 rconn_packet_counter_inc(counter);
576 queue_push_tail(&rc->txq, b);
578 /* If the queue was empty before we added 'b', try to send some
579 * packets. (But if the queue had packets in it, it's because the
580 * vconn is backlogged and there's no point in stuffing more into it
581 * now. We'll get back to that in rconn_run().) */
582 if (rc->txq.n == 1) {
591 /* Sends 'b' on 'rc'. Increments 'counter' while the packet is in flight; it
592 * will be decremented when it has been sent (or discarded due to
593 * disconnection). Returns 0 if successful, EAGAIN if 'counter->n' is already
594 * at least as large as 'queue_limit', or ENOTCONN if 'rc' is not currently
595 * connected. Regardless of return value, 'b' is destroyed.
597 * Because 'b' may be sent (or discarded) before this function returns, the
598 * caller may not be able to observe any change in 'counter'.
600 * There is no rconn_send_wait() function: an rconn has a send queue that it
601 * takes care of sending if you call rconn_run(), which will have the side
602 * effect of waking up poll_block(). */
604 rconn_send_with_limit(struct rconn *rc, struct ofpbuf *b,
605 struct rconn_packet_counter *counter, int queue_limit)
608 retval = counter->n >= queue_limit ? EAGAIN : rconn_send(rc, b, counter);
610 COVERAGE_INC(rconn_overflow);
616 /* Returns the total number of packets successfully sent on the underlying
617 * vconn. A packet is not counted as sent while it is still queued in the
618 * rconn, only when it has been successfuly passed to the vconn. */
620 rconn_packets_sent(const struct rconn *rc)
622 return rc->packets_sent;
625 /* Adds 'vconn' to 'rc' as a monitoring connection, to which all messages sent
626 * and received on 'rconn' will be copied. 'rc' takes ownership of 'vconn'. */
628 rconn_add_monitor(struct rconn *rc, struct vconn *vconn)
630 if (rc->n_monitors < ARRAY_SIZE(rc->monitors)) {
631 VLOG_INFO("new monitor connection from %s", vconn_get_name(vconn));
632 rc->monitors[rc->n_monitors++] = vconn;
634 VLOG_DBG("too many monitor connections, discarding %s",
635 vconn_get_name(vconn));
640 /* Returns 'rc''s name (the 'name' argument passed to rconn_new()). */
642 rconn_get_name(const struct rconn *rc)
647 /* Returns true if 'rconn' is connected or in the process of reconnecting,
648 * false if 'rconn' is disconnected and will not reconnect on its own. */
650 rconn_is_alive(const struct rconn *rconn)
652 return rconn->state != S_VOID;
655 /* Returns true if 'rconn' is connected, false otherwise. */
657 rconn_is_connected(const struct rconn *rconn)
659 return is_connected_state(rconn->state);
662 /* Returns true if 'rconn' is connected and thought to have been accepted by
663 * the peer's admission-control policy. */
665 rconn_is_admitted(const struct rconn *rconn)
667 return (rconn_is_connected(rconn)
668 && rconn->last_admitted >= rconn->last_connected);
671 /* Returns 0 if 'rconn' is currently connected and considered to have been
672 * accepted by the peer's admission-control policy, otherwise the number of
673 * seconds since 'rconn' was last in such a state. */
675 rconn_failure_duration(const struct rconn *rconn)
677 return rconn_is_admitted(rconn) ? 0 : time_now() - rconn->last_admitted;
680 /* Returns the IP address of the peer, or 0 if the peer's IP address is not
683 rconn_get_remote_ip(const struct rconn *rconn)
685 return rconn->remote_ip;
688 /* Returns the transport port of the peer, or 0 if the peer's port is not
691 rconn_get_remote_port(const struct rconn *rconn)
693 return rconn->remote_port;
696 /* Returns the IP address used to connect to the peer, or 0 if the
697 * connection is not an IP-based protocol or if its IP address is not
700 rconn_get_local_ip(const struct rconn *rconn)
702 return rconn->local_ip;
705 /* Returns the transport port used to connect to the peer, or 0 if the
706 * connection does not contain a port or if the port is not known. */
708 rconn_get_local_port(const struct rconn *rconn)
710 return rconn->vconn ? vconn_get_local_port(rconn->vconn) : 0;
713 /* If 'rconn' can't connect to the peer, it could be for any number of reasons.
714 * Usually, one would assume it is because the peer is not running or because
715 * the network is partitioned. But it could also be because the network
716 * topology has changed, in which case the upper layer will need to reassess it
717 * (in particular, obtain a new IP address via DHCP and find the new location
718 * of the controller). When this appears that this might be the case, this
719 * function returns true. It also clears the questionability flag and prevents
720 * it from being set again for some time. */
722 rconn_is_connectivity_questionable(struct rconn *rconn)
724 bool questionable = rconn->questionable_connectivity;
725 rconn->questionable_connectivity = false;
729 /* Returns the total number of packets successfully received by the underlying
732 rconn_packets_received(const struct rconn *rc)
734 return rc->packets_received;
737 /* Returns a string representing the internal state of 'rc'. The caller must
738 * not modify or free the string. */
740 rconn_get_state(const struct rconn *rc)
742 return state_name(rc->state);
745 /* Returns the number of connection attempts made by 'rc', including any
746 * ongoing attempt that has not yet succeeded or failed. */
748 rconn_get_attempted_connections(const struct rconn *rc)
750 return rc->n_attempted_connections;
753 /* Returns the number of successful connection attempts made by 'rc'. */
755 rconn_get_successful_connections(const struct rconn *rc)
757 return rc->n_successful_connections;
760 /* Returns the time at which the last successful connection was made by
763 rconn_get_last_connection(const struct rconn *rc)
765 return rc->last_connected;
768 /* Returns the time at which the last OpenFlow message was received by 'rc'.
769 * If no packets have been received on 'rc', returns the time at which 'rc'
772 rconn_get_last_received(const struct rconn *rc)
774 return rc->last_received;
777 /* Returns the time at which 'rc' was created. */
779 rconn_get_creation_time(const struct rconn *rc)
781 return rc->creation_time;
784 /* Returns the approximate number of seconds that 'rc' has been connected. */
786 rconn_get_total_time_connected(const struct rconn *rc)
788 return (rc->total_time_connected
789 + (rconn_is_connected(rc) ? elapsed_in_this_state(rc) : 0));
792 /* Returns the current amount of backoff, in seconds. This is the amount of
793 * time after which the rconn will transition from BACKOFF to CONNECTING. */
795 rconn_get_backoff(const struct rconn *rc)
800 /* Returns the number of seconds spent in this state so far. */
802 rconn_get_state_elapsed(const struct rconn *rc)
804 return elapsed_in_this_state(rc);
807 /* Returns 'rc''s current connection sequence number, a number that changes
808 * every time that 'rconn' connects or disconnects. */
810 rconn_get_connection_seqno(const struct rconn *rc)
815 /* Returns a value that explains why 'rc' last disconnected:
817 * - 0 means that the last disconnection was caused by a call to
818 * rconn_disconnect(), or that 'rc' is new and has not yet completed its
819 * initial connection or connection attempt.
821 * - EOF means that the connection was closed in the normal way by the peer.
823 * - A positive integer is an errno value that represents the error.
826 rconn_get_last_error(const struct rconn *rc)
828 return rc->last_error;
831 struct rconn_packet_counter *
832 rconn_packet_counter_create(void)
834 struct rconn_packet_counter *c = xmalloc(sizeof *c);
841 rconn_packet_counter_destroy(struct rconn_packet_counter *c)
844 assert(c->ref_cnt > 0);
845 if (!--c->ref_cnt && !c->n) {
852 rconn_packet_counter_inc(struct rconn_packet_counter *c)
858 rconn_packet_counter_dec(struct rconn_packet_counter *c)
861 if (!--c->n && !c->ref_cnt) {
866 /* Set the name of the remote vconn to 'name' and clear out the cached IP
867 * address and port information, since changing the name also likely changes
870 set_vconn_name(struct rconn *rc, const char *name)
873 rc->name = xstrdup(name);
879 /* Tries to send a packet from 'rc''s send buffer. Returns 0 if successful,
880 * otherwise a positive errno value. */
882 try_send(struct rconn *rc)
885 struct ofpbuf *next = rc->txq.head->next;
886 struct rconn_packet_counter *counter = rc->txq.head->private_p;
887 retval = vconn_send(rc->vconn, rc->txq.head);
889 if (retval != EAGAIN) {
890 report_error(rc, retval);
891 disconnect(rc, retval);
895 COVERAGE_INC(rconn_sent);
898 rconn_packet_counter_dec(counter);
900 queue_advance_head(&rc->txq, next);
904 /* Reports that 'error' caused 'rc' to disconnect. 'error' may be a positive
905 * errno value, or it may be EOF to indicate that the connection was closed
908 report_error(struct rconn *rc, int error)
911 /* If 'rc' isn't reliable, then we don't really expect this connection
912 * to last forever anyway (probably it's a connection that we received
913 * via accept()), so use DBG level to avoid cluttering the logs. */
914 enum vlog_level level = rc->reliable ? VLL_INFO : VLL_DBG;
915 VLOG(level, "%s: connection closed by peer", rc->name);
917 VLOG_WARN("%s: connection dropped (%s)", rc->name, strerror(error));
921 /* Disconnects 'rc' and records 'error' as the error that caused 'rc''s last
924 * - 0 means that this disconnection is due to a request by 'rc''s client,
925 * not due to any kind of network error.
927 * - EOF means that the connection was closed in the normal way by the peer.
929 * - A positive integer is an errno value that represents the error.
932 disconnect(struct rconn *rc, int error)
934 rc->last_error = error;
936 time_t now = time_now();
938 if (rc->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) {
939 vconn_close(rc->vconn);
944 if (now >= rc->backoff_deadline) {
947 rc->backoff = MIN(rc->max_backoff, MAX(1, 2 * rc->backoff));
948 VLOG_INFO("%s: waiting %d seconds before reconnect\n",
949 rc->name, rc->backoff);
951 rc->backoff_deadline = now + rc->backoff;
952 state_transition(rc, S_BACKOFF);
953 if (now - rc->last_connected > 60) {
954 question_connectivity(rc);
957 rconn_disconnect(rc);
961 /* Drops all the packets from 'rc''s send queue and decrements their queue
964 flush_queue(struct rconn *rc)
969 while (rc->txq.n > 0) {
970 struct ofpbuf *b = queue_pop_head(&rc->txq);
971 struct rconn_packet_counter *counter = b->private_p;
973 rconn_packet_counter_dec(counter);
975 COVERAGE_INC(rconn_discarded);
978 poll_immediate_wake();
982 elapsed_in_this_state(const struct rconn *rc)
984 return time_now() - rc->state_entered;
988 timeout(const struct rconn *rc)
991 #define STATE(NAME, VALUE) case S_##NAME: return timeout_##NAME(rc);
1000 timed_out(const struct rconn *rc)
1002 return time_now() >= sat_add(rc->state_entered, timeout(rc));
1006 state_transition(struct rconn *rc, enum state state)
1008 rc->seqno += (rc->state == S_ACTIVE) != (state == S_ACTIVE);
1009 if (is_connected_state(state) && !is_connected_state(rc->state)) {
1010 rc->probably_admitted = false;
1012 if (rconn_is_connected(rc)) {
1013 rc->total_time_connected += elapsed_in_this_state(rc);
1015 VLOG_DBG("%s: entering %s", rc->name, state_name(state));
1017 rc->state_entered = time_now();
1021 question_connectivity(struct rconn *rc)
1023 time_t now = time_now();
1024 if (now - rc->last_questioned > 60) {
1025 rc->questionable_connectivity = true;
1026 rc->last_questioned = now;
1031 copy_to_monitor(struct rconn *rc, const struct ofpbuf *b)
1033 struct ofpbuf *clone = NULL;
1037 for (i = 0; i < rc->n_monitors; ) {
1038 struct vconn *vconn = rc->monitors[i];
1041 clone = ofpbuf_clone(b);
1043 retval = vconn_send(vconn, clone);
1046 } else if (retval != EAGAIN) {
1047 VLOG_DBG("%s: closing monitor connection to %s: %s",
1048 rconn_get_name(rc), vconn_get_name(vconn),
1050 rc->monitors[i] = rc->monitors[--rc->n_monitors];
1055 ofpbuf_delete(clone);
1059 is_connected_state(enum state state)
1061 return (state & (S_ACTIVE | S_IDLE)) != 0;
1065 is_admitted_msg(const struct ofpbuf *b)
1067 struct ofp_header *oh = b->data;
1068 uint8_t type = oh->type;
1070 && (1u << type) & ((1u << OFPT_HELLO) |
1071 (1u << OFPT_ERROR) |
1072 (1u << OFPT_ECHO_REQUEST) |
1073 (1u << OFPT_ECHO_REPLY) |
1074 (1u << OFPT_VENDOR) |
1075 (1u << OFPT_FEATURES_REQUEST) |
1076 (1u << OFPT_FEATURES_REPLY) |
1077 (1u << OFPT_GET_CONFIG_REQUEST) |
1078 (1u << OFPT_GET_CONFIG_REPLY) |
1079 (1u << OFPT_SET_CONFIG)));