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(struct vconn *vconn)
161 struct rconn *rc = rconn_create(60, 0);
162 rconn_connect_unreliably(rc, 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, struct vconn *vconn)
262 assert(vconn != NULL);
263 rconn_disconnect(rc);
264 set_vconn_name(rc, vconn_get_name(vconn));
265 rc->reliable = false;
267 rc->last_connected = time_now();
268 state_transition(rc, S_ACTIVE);
271 /* If 'rc' is connected, forces it to drop the connection and reconnect. */
273 rconn_reconnect(struct rconn *rc)
275 if (rc->state & (S_ACTIVE | S_IDLE)) {
276 VLOG_INFO("%s: disconnecting", rc->name);
282 rconn_disconnect(struct rconn *rc)
284 if (rc->state != S_VOID) {
286 vconn_close(rc->vconn);
289 set_vconn_name(rc, "void");
290 rc->reliable = false;
293 rc->backoff_deadline = TIME_MIN;
295 state_transition(rc, S_VOID);
299 /* Disconnects 'rc' and frees the underlying storage. */
301 rconn_destroy(struct rconn *rc)
307 vconn_close(rc->vconn);
309 queue_destroy(&rc->txq);
310 for (i = 0; i < rc->n_monitors; i++) {
311 vconn_close(rc->monitors[i]);
318 timeout_VOID(const struct rconn *rc OVS_UNUSED)
324 run_VOID(struct rconn *rc OVS_UNUSED)
330 reconnect(struct rconn *rc)
334 VLOG_INFO("%s: connecting...", rc->name);
335 rc->n_attempted_connections++;
336 retval = vconn_open(rc->name, OFP_VERSION, &rc->vconn);
338 rc->remote_ip = vconn_get_remote_ip(rc->vconn);
339 rc->local_ip = vconn_get_local_ip(rc->vconn);
340 rc->remote_port = vconn_get_remote_port(rc->vconn);
341 rc->backoff_deadline = time_now() + rc->backoff;
342 state_transition(rc, S_CONNECTING);
344 VLOG_WARN("%s: connection failed (%s)", rc->name, strerror(retval));
345 rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
346 disconnect(rc, retval);
352 timeout_BACKOFF(const struct rconn *rc)
358 run_BACKOFF(struct rconn *rc)
366 timeout_CONNECTING(const struct rconn *rc)
368 return MAX(1, rc->backoff);
372 run_CONNECTING(struct rconn *rc)
374 int retval = vconn_connect(rc->vconn);
376 VLOG_INFO("%s: connected", rc->name);
377 rc->n_successful_connections++;
378 state_transition(rc, S_ACTIVE);
379 rc->last_connected = rc->state_entered;
380 } else if (retval != EAGAIN) {
381 VLOG_INFO("%s: connection failed (%s)", rc->name, strerror(retval));
382 disconnect(rc, retval);
383 } else if (timed_out(rc)) {
384 VLOG_INFO("%s: connection timed out", rc->name);
385 rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
386 disconnect(rc, ETIMEDOUT);
391 do_tx_work(struct rconn *rc)
396 while (rc->txq.n > 0) {
397 int error = try_send(rc);
403 poll_immediate_wake();
408 timeout_ACTIVE(const struct rconn *rc)
410 if (rc->probe_interval) {
411 unsigned int base = MAX(rc->last_received, rc->state_entered);
412 unsigned int arg = base + rc->probe_interval - rc->state_entered;
419 run_ACTIVE(struct rconn *rc)
422 unsigned int base = MAX(rc->last_received, rc->state_entered);
423 VLOG_DBG("%s: idle %u seconds, sending inactivity probe",
424 rc->name, (unsigned int) (time_now() - base));
426 /* Ordering is important here: rconn_send() can transition to BACKOFF,
427 * and we don't want to transition back to IDLE if so, because then we
428 * can end up queuing a packet with vconn == NULL and then *boom*. */
429 state_transition(rc, S_IDLE);
430 rconn_send(rc, make_echo_request(), NULL);
438 timeout_IDLE(const struct rconn *rc)
440 return rc->probe_interval;
444 run_IDLE(struct rconn *rc)
447 question_connectivity(rc);
448 VLOG_ERR("%s: no response to inactivity probe after %u "
449 "seconds, disconnecting",
450 rc->name, elapsed_in_this_state(rc));
451 disconnect(rc, ETIMEDOUT);
457 /* Performs whatever activities are necessary to maintain 'rc': if 'rc' is
458 * disconnected, attempts to (re)connect, backing off as necessary; if 'rc' is
459 * connected, attempts to send packets in the send queue, if any. */
461 rconn_run(struct rconn *rc)
467 vconn_run(rc->vconn);
469 for (i = 0; i < rc->n_monitors; i++) {
470 vconn_run(rc->monitors[i]);
474 old_state = rc->state;
476 #define STATE(NAME, VALUE) case S_##NAME: run_##NAME(rc); break;
482 } while (rc->state != old_state);
485 /* Causes the next call to poll_block() to wake up when rconn_run() should be
488 rconn_run_wait(struct rconn *rc)
494 vconn_run_wait(rc->vconn);
496 for (i = 0; i < rc->n_monitors; i++) {
497 vconn_run_wait(rc->monitors[i]);
501 if (timeo != UINT_MAX) {
502 long long int expires = sat_add(rc->state_entered, timeo);
503 poll_timer_wait_until(expires * 1000);
506 if ((rc->state & (S_ACTIVE | S_IDLE)) && rc->txq.n) {
507 vconn_wait(rc->vconn, WAIT_SEND);
511 /* Attempts to receive a packet from 'rc'. If successful, returns the packet;
512 * otherwise, returns a null pointer. The caller is responsible for freeing
513 * the packet (with ofpbuf_delete()). */
515 rconn_recv(struct rconn *rc)
517 if (rc->state & (S_ACTIVE | S_IDLE)) {
518 struct ofpbuf *buffer;
519 int error = vconn_recv(rc->vconn, &buffer);
521 copy_to_monitor(rc, buffer);
522 if (rc->probably_admitted || is_admitted_msg(buffer)
523 || time_now() - rc->last_connected >= 30) {
524 rc->probably_admitted = true;
525 rc->last_admitted = time_now();
527 rc->last_received = time_now();
528 rc->packets_received++;
529 if (rc->state == S_IDLE) {
530 state_transition(rc, S_ACTIVE);
533 } else if (error != EAGAIN) {
534 report_error(rc, error);
535 disconnect(rc, error);
541 /* Causes the next call to poll_block() to wake up when a packet may be ready
542 * to be received by vconn_recv() on 'rc'. */
544 rconn_recv_wait(struct rconn *rc)
547 vconn_wait(rc->vconn, WAIT_RECV);
551 /* Sends 'b' on 'rc'. Returns 0 if successful (in which case 'b' is
552 * destroyed), or ENOTCONN if 'rc' is not currently connected (in which case
553 * the caller retains ownership of 'b').
555 * If 'counter' is non-null, then 'counter' will be incremented while the
556 * packet is in flight, then decremented when it has been sent (or discarded
557 * due to disconnection). Because 'b' may be sent (or discarded) before this
558 * function returns, the caller may not be able to observe any change in
561 * There is no rconn_send_wait() function: an rconn has a send queue that it
562 * takes care of sending if you call rconn_run(), which will have the side
563 * effect of waking up poll_block(). */
565 rconn_send(struct rconn *rc, struct ofpbuf *b,
566 struct rconn_packet_counter *counter)
568 if (rconn_is_connected(rc)) {
569 COVERAGE_INC(rconn_queued);
570 copy_to_monitor(rc, b);
571 b->private_p = counter;
573 rconn_packet_counter_inc(counter);
575 queue_push_tail(&rc->txq, b);
577 /* If the queue was empty before we added 'b', try to send some
578 * packets. (But if the queue had packets in it, it's because the
579 * vconn is backlogged and there's no point in stuffing more into it
580 * now. We'll get back to that in rconn_run().) */
581 if (rc->txq.n == 1) {
590 /* Sends 'b' on 'rc'. Increments 'counter' while the packet is in flight; it
591 * will be decremented when it has been sent (or discarded due to
592 * disconnection). Returns 0 if successful, EAGAIN if 'counter->n' is already
593 * at least as large as 'queue_limit', or ENOTCONN if 'rc' is not currently
594 * connected. Regardless of return value, 'b' is destroyed.
596 * Because 'b' may be sent (or discarded) before this function returns, the
597 * caller may not be able to observe any change in 'counter'.
599 * There is no rconn_send_wait() function: an rconn has a send queue that it
600 * takes care of sending if you call rconn_run(), which will have the side
601 * effect of waking up poll_block(). */
603 rconn_send_with_limit(struct rconn *rc, struct ofpbuf *b,
604 struct rconn_packet_counter *counter, int queue_limit)
607 retval = counter->n >= queue_limit ? EAGAIN : rconn_send(rc, b, counter);
609 COVERAGE_INC(rconn_overflow);
615 /* Returns the total number of packets successfully sent on the underlying
616 * vconn. A packet is not counted as sent while it is still queued in the
617 * rconn, only when it has been successfuly passed to the vconn. */
619 rconn_packets_sent(const struct rconn *rc)
621 return rc->packets_sent;
624 /* Adds 'vconn' to 'rc' as a monitoring connection, to which all messages sent
625 * and received on 'rconn' will be copied. 'rc' takes ownership of 'vconn'. */
627 rconn_add_monitor(struct rconn *rc, struct vconn *vconn)
629 if (rc->n_monitors < ARRAY_SIZE(rc->monitors)) {
630 VLOG_INFO("new monitor connection from %s", vconn_get_name(vconn));
631 rc->monitors[rc->n_monitors++] = vconn;
633 VLOG_DBG("too many monitor connections, discarding %s",
634 vconn_get_name(vconn));
639 /* Returns 'rc''s name (the 'name' argument passed to rconn_new()). */
641 rconn_get_name(const struct rconn *rc)
646 /* Returns true if 'rconn' is connected or in the process of reconnecting,
647 * false if 'rconn' is disconnected and will not reconnect on its own. */
649 rconn_is_alive(const struct rconn *rconn)
651 return rconn->state != S_VOID;
654 /* Returns true if 'rconn' is connected, false otherwise. */
656 rconn_is_connected(const struct rconn *rconn)
658 return is_connected_state(rconn->state);
661 /* Returns true if 'rconn' is connected and thought to have been accepted by
662 * the peer's admission-control policy. */
664 rconn_is_admitted(const struct rconn *rconn)
666 return (rconn_is_connected(rconn)
667 && rconn->last_admitted >= rconn->last_connected);
670 /* Returns 0 if 'rconn' is currently connected and considered to have been
671 * accepted by the peer's admission-control policy, otherwise the number of
672 * seconds since 'rconn' was last in such a state. */
674 rconn_failure_duration(const struct rconn *rconn)
676 return rconn_is_admitted(rconn) ? 0 : time_now() - rconn->last_admitted;
679 /* Returns the IP address of the peer, or 0 if the peer's IP address is not
682 rconn_get_remote_ip(const struct rconn *rconn)
684 return rconn->remote_ip;
687 /* Returns the transport port of the peer, or 0 if the peer's port is not
690 rconn_get_remote_port(const struct rconn *rconn)
692 return rconn->remote_port;
695 /* Returns the IP address used to connect to the peer, or 0 if the
696 * connection is not an IP-based protocol or if its IP address is not
699 rconn_get_local_ip(const struct rconn *rconn)
701 return rconn->local_ip;
704 /* Returns the transport port used to connect to the peer, or 0 if the
705 * connection does not contain a port or if the port is not known. */
707 rconn_get_local_port(const struct rconn *rconn)
709 return rconn->vconn ? vconn_get_local_port(rconn->vconn) : 0;
712 /* If 'rconn' can't connect to the peer, it could be for any number of reasons.
713 * Usually, one would assume it is because the peer is not running or because
714 * the network is partitioned. But it could also be because the network
715 * topology has changed, in which case the upper layer will need to reassess it
716 * (in particular, obtain a new IP address via DHCP and find the new location
717 * of the controller). When this appears that this might be the case, this
718 * function returns true. It also clears the questionability flag and prevents
719 * it from being set again for some time. */
721 rconn_is_connectivity_questionable(struct rconn *rconn)
723 bool questionable = rconn->questionable_connectivity;
724 rconn->questionable_connectivity = false;
728 /* Returns the total number of packets successfully received by the underlying
731 rconn_packets_received(const struct rconn *rc)
733 return rc->packets_received;
736 /* Returns a string representing the internal state of 'rc'. The caller must
737 * not modify or free the string. */
739 rconn_get_state(const struct rconn *rc)
741 return state_name(rc->state);
744 /* Returns the number of connection attempts made by 'rc', including any
745 * ongoing attempt that has not yet succeeded or failed. */
747 rconn_get_attempted_connections(const struct rconn *rc)
749 return rc->n_attempted_connections;
752 /* Returns the number of successful connection attempts made by 'rc'. */
754 rconn_get_successful_connections(const struct rconn *rc)
756 return rc->n_successful_connections;
759 /* Returns the time at which the last successful connection was made by
762 rconn_get_last_connection(const struct rconn *rc)
764 return rc->last_connected;
767 /* Returns the time at which the last OpenFlow message was received by 'rc'.
768 * If no packets have been received on 'rc', returns the time at which 'rc'
771 rconn_get_last_received(const struct rconn *rc)
773 return rc->last_received;
776 /* Returns the time at which 'rc' was created. */
778 rconn_get_creation_time(const struct rconn *rc)
780 return rc->creation_time;
783 /* Returns the approximate number of seconds that 'rc' has been connected. */
785 rconn_get_total_time_connected(const struct rconn *rc)
787 return (rc->total_time_connected
788 + (rconn_is_connected(rc) ? elapsed_in_this_state(rc) : 0));
791 /* Returns the current amount of backoff, in seconds. This is the amount of
792 * time after which the rconn will transition from BACKOFF to CONNECTING. */
794 rconn_get_backoff(const struct rconn *rc)
799 /* Returns the number of seconds spent in this state so far. */
801 rconn_get_state_elapsed(const struct rconn *rc)
803 return elapsed_in_this_state(rc);
806 /* Returns 'rc''s current connection sequence number, a number that changes
807 * every time that 'rconn' connects or disconnects. */
809 rconn_get_connection_seqno(const struct rconn *rc)
814 /* Returns a value that explains why 'rc' last disconnected:
816 * - 0 means that the last disconnection was caused by a call to
817 * rconn_disconnect(), or that 'rc' is new and has not yet completed its
818 * initial connection or connection attempt.
820 * - EOF means that the connection was closed in the normal way by the peer.
822 * - A positive integer is an errno value that represents the error.
825 rconn_get_last_error(const struct rconn *rc)
827 return rc->last_error;
830 struct rconn_packet_counter *
831 rconn_packet_counter_create(void)
833 struct rconn_packet_counter *c = xmalloc(sizeof *c);
840 rconn_packet_counter_destroy(struct rconn_packet_counter *c)
843 assert(c->ref_cnt > 0);
844 if (!--c->ref_cnt && !c->n) {
851 rconn_packet_counter_inc(struct rconn_packet_counter *c)
857 rconn_packet_counter_dec(struct rconn_packet_counter *c)
860 if (!--c->n && !c->ref_cnt) {
865 /* Set the name of the remote vconn to 'name' and clear out the cached IP
866 * address and port information, since changing the name also likely changes
869 set_vconn_name(struct rconn *rc, const char *name)
872 rc->name = xstrdup(name);
878 /* Tries to send a packet from 'rc''s send buffer. Returns 0 if successful,
879 * otherwise a positive errno value. */
881 try_send(struct rconn *rc)
884 struct ofpbuf *next = rc->txq.head->next;
885 struct rconn_packet_counter *counter = rc->txq.head->private_p;
886 retval = vconn_send(rc->vconn, rc->txq.head);
888 if (retval != EAGAIN) {
889 report_error(rc, retval);
890 disconnect(rc, retval);
894 COVERAGE_INC(rconn_sent);
897 rconn_packet_counter_dec(counter);
899 queue_advance_head(&rc->txq, next);
903 /* Reports that 'error' caused 'rc' to disconnect. 'error' may be a positive
904 * errno value, or it may be EOF to indicate that the connection was closed
907 report_error(struct rconn *rc, int error)
910 /* If 'rc' isn't reliable, then we don't really expect this connection
911 * to last forever anyway (probably it's a connection that we received
912 * via accept()), so use DBG level to avoid cluttering the logs. */
913 enum vlog_level level = rc->reliable ? VLL_INFO : VLL_DBG;
914 VLOG(level, "%s: connection closed by peer", rc->name);
916 VLOG_WARN("%s: connection dropped (%s)", rc->name, strerror(error));
920 /* Disconnects 'rc' and records 'error' as the error that caused 'rc''s last
923 * - 0 means that this disconnection is due to a request by 'rc''s client,
924 * not due to any kind of network error.
926 * - EOF means that the connection was closed in the normal way by the peer.
928 * - A positive integer is an errno value that represents the error.
931 disconnect(struct rconn *rc, int error)
933 rc->last_error = error;
935 time_t now = time_now();
937 if (rc->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) {
938 vconn_close(rc->vconn);
943 if (now >= rc->backoff_deadline) {
946 rc->backoff = MIN(rc->max_backoff, MAX(1, 2 * rc->backoff));
947 VLOG_INFO("%s: waiting %d seconds before reconnect\n",
948 rc->name, rc->backoff);
950 rc->backoff_deadline = now + rc->backoff;
951 state_transition(rc, S_BACKOFF);
952 if (now - rc->last_connected > 60) {
953 question_connectivity(rc);
956 rconn_disconnect(rc);
960 /* Drops all the packets from 'rc''s send queue and decrements their queue
963 flush_queue(struct rconn *rc)
968 while (rc->txq.n > 0) {
969 struct ofpbuf *b = queue_pop_head(&rc->txq);
970 struct rconn_packet_counter *counter = b->private_p;
972 rconn_packet_counter_dec(counter);
974 COVERAGE_INC(rconn_discarded);
977 poll_immediate_wake();
981 elapsed_in_this_state(const struct rconn *rc)
983 return time_now() - rc->state_entered;
987 timeout(const struct rconn *rc)
990 #define STATE(NAME, VALUE) case S_##NAME: return timeout_##NAME(rc);
999 timed_out(const struct rconn *rc)
1001 return time_now() >= sat_add(rc->state_entered, timeout(rc));
1005 state_transition(struct rconn *rc, enum state state)
1007 rc->seqno += (rc->state == S_ACTIVE) != (state == S_ACTIVE);
1008 if (is_connected_state(state) && !is_connected_state(rc->state)) {
1009 rc->probably_admitted = false;
1011 if (rconn_is_connected(rc)) {
1012 rc->total_time_connected += elapsed_in_this_state(rc);
1014 VLOG_DBG("%s: entering %s", rc->name, state_name(state));
1016 rc->state_entered = time_now();
1020 question_connectivity(struct rconn *rc)
1022 time_t now = time_now();
1023 if (now - rc->last_questioned > 60) {
1024 rc->questionable_connectivity = true;
1025 rc->last_questioned = now;
1030 copy_to_monitor(struct rconn *rc, const struct ofpbuf *b)
1032 struct ofpbuf *clone = NULL;
1036 for (i = 0; i < rc->n_monitors; ) {
1037 struct vconn *vconn = rc->monitors[i];
1040 clone = ofpbuf_clone(b);
1042 retval = vconn_send(vconn, clone);
1045 } else if (retval != EAGAIN) {
1046 VLOG_DBG("%s: closing monitor connection to %s: %s",
1047 rconn_get_name(rc), vconn_get_name(vconn),
1049 rc->monitors[i] = rc->monitors[--rc->n_monitors];
1054 ofpbuf_delete(clone);
1058 is_connected_state(enum state state)
1060 return (state & (S_ACTIVE | S_IDLE)) != 0;
1064 is_admitted_msg(const struct ofpbuf *b)
1066 struct ofp_header *oh = b->data;
1067 uint8_t type = oh->type;
1069 && (1u << type) & ((1u << OFPT_HELLO) |
1070 (1u << OFPT_ERROR) |
1071 (1u << OFPT_ECHO_REQUEST) |
1072 (1u << OFPT_ECHO_REPLY) |
1073 (1u << OFPT_VENDOR) |
1074 (1u << OFPT_FEATURES_REQUEST) |
1075 (1u << OFPT_FEATURES_REPLY) |
1076 (1u << OFPT_GET_CONFIG_REQUEST) |
1077 (1u << OFPT_GET_CONFIG_REPLY) |
1078 (1u << OFPT_SET_CONFIG)));