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;
80 /* In S_ACTIVE and S_IDLE, probably_admitted reports whether we believe
81 * that the peer has made a (positive) admission control decision on our
82 * connection. If we have not yet been (probably) admitted, then the
83 * connection does not reset the timer used for deciding whether the switch
84 * should go into fail-open mode.
86 * last_admitted reports the last time we believe such a positive admission
87 * control decision was made. */
88 bool probably_admitted;
91 /* These values are simply for statistics reporting, not used directly by
92 * anything internal to the rconn (or ofproto for that matter). */
93 unsigned int packets_received;
94 unsigned int n_attempted_connections, n_successful_connections;
96 unsigned long int total_time_connected;
98 /* If we can't connect to the peer, it could be for any number of reasons.
99 * Usually, one would assume it is because the peer is not running or
100 * because the network is partitioned. But it could also be because the
101 * network topology has changed, in which case the upper layer will need to
102 * reassess it (in particular, obtain a new IP address via DHCP and find
103 * the new location of the controller). We set this flag when we suspect
104 * that this could be the case. */
105 bool questionable_connectivity;
106 time_t last_questioned;
108 /* Throughout this file, "probe" is shorthand for "inactivity probe".
109 * When nothing has been received from the peer for a while, we send out
110 * an echo request as an inactivity probe packet. We should receive back
112 int probe_interval; /* Secs of inactivity before sending probe. */
114 /* When we create a vconn we obtain these values, to save them past the end
115 * of the vconn's lifetime. Otherwise, in-band control will only allow
116 * traffic when a vconn is actually open, but it is nice to allow ARP to
117 * complete even between connection attempts, and it is also polite to
118 * allow traffic from other switches to go through to the controller
119 * whether or not we are connected.
121 * We don't cache the local port, because that changes from one connection
122 * attempt to the next. */
123 uint32_t local_ip, remote_ip;
124 uint16_t remote_port;
126 /* Messages sent or received are copied to the monitor connections. */
127 #define MAX_MONITORS 8
128 struct vconn *monitors[8];
132 static unsigned int elapsed_in_this_state(const struct rconn *);
133 static unsigned int timeout(const struct rconn *);
134 static bool timed_out(const struct rconn *);
135 static void state_transition(struct rconn *, enum state);
136 static void set_vconn_name(struct rconn *, const char *name);
137 static int try_send(struct rconn *);
138 static int reconnect(struct rconn *);
139 static void report_error(struct rconn *, int error);
140 static void disconnect(struct rconn *, int error);
141 static void flush_queue(struct rconn *);
142 static void question_connectivity(struct rconn *);
143 static void copy_to_monitor(struct rconn *, const struct ofpbuf *);
144 static bool is_connected_state(enum state);
145 static bool is_admitted_msg(const struct ofpbuf *);
147 /* Creates a new rconn, connects it (reliably) to 'name', and returns it. */
149 rconn_new(const char *name, int inactivity_probe_interval, int max_backoff)
151 struct rconn *rc = rconn_create(inactivity_probe_interval, max_backoff);
152 rconn_connect(rc, name);
156 /* Creates a new rconn, connects it (unreliably) to 'vconn', and returns it. */
158 rconn_new_from_vconn(const char *name, struct vconn *vconn)
160 struct rconn *rc = rconn_create(60, 0);
161 rconn_connect_unreliably(rc, name, vconn);
165 /* Creates and returns a new rconn.
167 * 'probe_interval' is a number of seconds. If the interval passes once
168 * without an OpenFlow message being received from the peer, the rconn sends
169 * out an "echo request" message. If the interval passes again without a
170 * message being received, the rconn disconnects and re-connects to the peer.
171 * Setting 'probe_interval' to 0 disables this behavior.
173 * 'max_backoff' is the maximum number of seconds between attempts to connect
174 * to the peer. The actual interval starts at 1 second and doubles on each
175 * failure until it reaches 'max_backoff'. If 0 is specified, the default of
176 * 8 seconds is used. */
178 rconn_create(int probe_interval, int max_backoff)
180 struct rconn *rc = xcalloc(1, sizeof *rc);
183 rc->state_entered = time_now();
186 rc->name = xstrdup("void");
187 rc->reliable = false;
189 queue_init(&rc->txq);
192 rc->max_backoff = max_backoff ? max_backoff : 8;
193 rc->backoff_deadline = TIME_MIN;
194 rc->last_received = time_now();
195 rc->last_connected = time_now();
198 rc->packets_sent = 0;
200 rc->probably_admitted = false;
201 rc->last_admitted = time_now();
203 rc->packets_received = 0;
204 rc->n_attempted_connections = 0;
205 rc->n_successful_connections = 0;
206 rc->creation_time = time_now();
207 rc->total_time_connected = 0;
209 rc->questionable_connectivity = false;
210 rc->last_questioned = time_now();
212 rconn_set_probe_interval(rc, probe_interval);
220 rconn_set_max_backoff(struct rconn *rc, int max_backoff)
222 rc->max_backoff = MAX(1, max_backoff);
223 if (rc->state == S_BACKOFF && rc->backoff > max_backoff) {
224 rc->backoff = max_backoff;
225 if (rc->backoff_deadline > time_now() + max_backoff) {
226 rc->backoff_deadline = time_now() + max_backoff;
232 rconn_get_max_backoff(const struct rconn *rc)
234 return rc->max_backoff;
238 rconn_set_probe_interval(struct rconn *rc, int probe_interval)
240 rc->probe_interval = probe_interval ? MAX(5, probe_interval) : 0;
244 rconn_get_probe_interval(const struct rconn *rc)
246 return rc->probe_interval;
250 rconn_connect(struct rconn *rc, const char *name)
252 rconn_disconnect(rc);
253 set_vconn_name(rc, name);
255 return reconnect(rc);
259 rconn_connect_unreliably(struct rconn *rc,
260 const char *name, struct vconn *vconn)
262 assert(vconn != NULL);
263 rconn_disconnect(rc);
264 set_vconn_name(rc, name);
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. */
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. */
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));
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)
465 old_state = rc->state;
467 #define STATE(NAME, VALUE) case S_##NAME: run_##NAME(rc); break;
473 } while (rc->state != old_state);
476 /* Causes the next call to poll_block() to wake up when rconn_run() should be
479 rconn_run_wait(struct rconn *rc)
481 unsigned int timeo = timeout(rc);
482 if (timeo != UINT_MAX) {
483 unsigned int expires = sat_add(rc->state_entered, timeo);
484 unsigned int remaining = sat_sub(expires, time_now());
485 poll_timer_wait(sat_mul(remaining, 1000));
488 if ((rc->state & (S_ACTIVE | S_IDLE)) && rc->txq.n) {
489 vconn_wait(rc->vconn, WAIT_SEND);
493 /* Attempts to receive a packet from 'rc'. If successful, returns the packet;
494 * otherwise, returns a null pointer. The caller is responsible for freeing
495 * the packet (with ofpbuf_delete()). */
497 rconn_recv(struct rconn *rc)
499 if (rc->state & (S_ACTIVE | S_IDLE)) {
500 struct ofpbuf *buffer;
501 int error = vconn_recv(rc->vconn, &buffer);
503 copy_to_monitor(rc, buffer);
504 if (rc->probably_admitted || is_admitted_msg(buffer)
505 || time_now() - rc->last_connected >= 30) {
506 rc->probably_admitted = true;
507 rc->last_admitted = time_now();
509 rc->last_received = time_now();
510 rc->packets_received++;
511 if (rc->state == S_IDLE) {
512 state_transition(rc, S_ACTIVE);
515 } else if (error != EAGAIN) {
516 report_error(rc, error);
517 disconnect(rc, error);
523 /* Causes the next call to poll_block() to wake up when a packet may be ready
524 * to be received by vconn_recv() on 'rc'. */
526 rconn_recv_wait(struct rconn *rc)
529 vconn_wait(rc->vconn, WAIT_RECV);
533 /* Sends 'b' on 'rc'. Returns 0 if successful (in which case 'b' is
534 * destroyed), or ENOTCONN if 'rc' is not currently connected (in which case
535 * the caller retains ownership of 'b').
537 * If 'counter' is non-null, then 'counter' will be incremented while the
538 * packet is in flight, then decremented when it has been sent (or discarded
539 * due to disconnection). Because 'b' may be sent (or discarded) before this
540 * function returns, the caller may not be able to observe any change in
543 * There is no rconn_send_wait() function: an rconn has a send queue that it
544 * takes care of sending if you call rconn_run(), which will have the side
545 * effect of waking up poll_block(). */
547 rconn_send(struct rconn *rc, struct ofpbuf *b,
548 struct rconn_packet_counter *counter)
550 if (rconn_is_connected(rc)) {
551 COVERAGE_INC(rconn_queued);
552 copy_to_monitor(rc, b);
553 b->private_p = counter;
555 rconn_packet_counter_inc(counter);
557 queue_push_tail(&rc->txq, b);
559 /* If the queue was empty before we added 'b', try to send some
560 * packets. (But if the queue had packets in it, it's because the
561 * vconn is backlogged and there's no point in stuffing more into it
562 * now. We'll get back to that in rconn_run().) */
563 if (rc->txq.n == 1) {
572 /* Sends 'b' on 'rc'. Increments 'counter' while the packet is in flight; it
573 * will be decremented when it has been sent (or discarded due to
574 * disconnection). Returns 0 if successful, EAGAIN if 'counter->n' is already
575 * at least as large as 'queue_limit', or ENOTCONN if 'rc' is not currently
576 * connected. Regardless of return value, 'b' is destroyed.
578 * Because 'b' may be sent (or discarded) before this function returns, the
579 * caller may not be able to observe any change in 'counter'.
581 * There is no rconn_send_wait() function: an rconn has a send queue that it
582 * takes care of sending if you call rconn_run(), which will have the side
583 * effect of waking up poll_block(). */
585 rconn_send_with_limit(struct rconn *rc, struct ofpbuf *b,
586 struct rconn_packet_counter *counter, int queue_limit)
589 retval = counter->n >= queue_limit ? EAGAIN : rconn_send(rc, b, counter);
591 COVERAGE_INC(rconn_overflow);
597 /* Returns the total number of packets successfully sent on the underlying
598 * vconn. A packet is not counted as sent while it is still queued in the
599 * rconn, only when it has been successfuly passed to the vconn. */
601 rconn_packets_sent(const struct rconn *rc)
603 return rc->packets_sent;
606 /* Adds 'vconn' to 'rc' as a monitoring connection, to which all messages sent
607 * and received on 'rconn' will be copied. 'rc' takes ownership of 'vconn'. */
609 rconn_add_monitor(struct rconn *rc, struct vconn *vconn)
611 if (rc->n_monitors < ARRAY_SIZE(rc->monitors)) {
612 VLOG_INFO("new monitor connection from %s", vconn_get_name(vconn));
613 rc->monitors[rc->n_monitors++] = vconn;
615 VLOG_DBG("too many monitor connections, discarding %s",
616 vconn_get_name(vconn));
621 /* Returns 'rc''s name (the 'name' argument passed to rconn_new()). */
623 rconn_get_name(const struct rconn *rc)
628 /* Returns true if 'rconn' is connected or in the process of reconnecting,
629 * false if 'rconn' is disconnected and will not reconnect on its own. */
631 rconn_is_alive(const struct rconn *rconn)
633 return rconn->state != S_VOID;
636 /* Returns true if 'rconn' is connected, false otherwise. */
638 rconn_is_connected(const struct rconn *rconn)
640 return is_connected_state(rconn->state);
643 /* Returns true if 'rconn' is connected and thought to have been accepted by
644 * the peer's admission-control policy. */
646 rconn_is_admitted(const struct rconn *rconn)
648 return (rconn_is_connected(rconn)
649 && rconn->last_admitted >= rconn->last_connected);
652 /* Returns 0 if 'rconn' is currently connected and considered to have been
653 * accepted by the peer's admission-control policy, otherwise the number of
654 * seconds since 'rconn' was last in such a state. */
656 rconn_failure_duration(const struct rconn *rconn)
658 return rconn_is_admitted(rconn) ? 0 : time_now() - rconn->last_admitted;
661 /* Returns the IP address of the peer, or 0 if the peer's IP address is not
664 rconn_get_remote_ip(const struct rconn *rconn)
666 return rconn->remote_ip;
669 /* Returns the transport port of the peer, or 0 if the peer's port is not
672 rconn_get_remote_port(const struct rconn *rconn)
674 return rconn->remote_port;
677 /* Returns the IP address used to connect to the peer, or 0 if the
678 * connection is not an IP-based protocol or if its IP address is not
681 rconn_get_local_ip(const struct rconn *rconn)
683 return rconn->local_ip;
686 /* Returns the transport port used to connect to the peer, or 0 if the
687 * connection does not contain a port or if the port is not known. */
689 rconn_get_local_port(const struct rconn *rconn)
691 return rconn->vconn ? vconn_get_local_port(rconn->vconn) : 0;
694 /* If 'rconn' can't connect to the peer, it could be for any number of reasons.
695 * Usually, one would assume it is because the peer is not running or because
696 * the network is partitioned. But it could also be because the network
697 * topology has changed, in which case the upper layer will need to reassess it
698 * (in particular, obtain a new IP address via DHCP and find the new location
699 * of the controller). When this appears that this might be the case, this
700 * function returns true. It also clears the questionability flag and prevents
701 * it from being set again for some time. */
703 rconn_is_connectivity_questionable(struct rconn *rconn)
705 bool questionable = rconn->questionable_connectivity;
706 rconn->questionable_connectivity = false;
710 /* Returns the total number of packets successfully received by the underlying
713 rconn_packets_received(const struct rconn *rc)
715 return rc->packets_received;
718 /* Returns a string representing the internal state of 'rc'. The caller must
719 * not modify or free the string. */
721 rconn_get_state(const struct rconn *rc)
723 return state_name(rc->state);
726 /* Returns the number of connection attempts made by 'rc', including any
727 * ongoing attempt that has not yet succeeded or failed. */
729 rconn_get_attempted_connections(const struct rconn *rc)
731 return rc->n_attempted_connections;
734 /* Returns the number of successful connection attempts made by 'rc'. */
736 rconn_get_successful_connections(const struct rconn *rc)
738 return rc->n_successful_connections;
741 /* Returns the time at which the last successful connection was made by
744 rconn_get_last_connection(const struct rconn *rc)
746 return rc->last_connected;
749 /* Returns the time at which the last OpenFlow message was received by 'rc'.
750 * If no packets have been received on 'rc', returns the time at which 'rc'
753 rconn_get_last_received(const struct rconn *rc)
755 return rc->last_received;
758 /* Returns the time at which 'rc' was created. */
760 rconn_get_creation_time(const struct rconn *rc)
762 return rc->creation_time;
765 /* Returns the approximate number of seconds that 'rc' has been connected. */
767 rconn_get_total_time_connected(const struct rconn *rc)
769 return (rc->total_time_connected
770 + (rconn_is_connected(rc) ? elapsed_in_this_state(rc) : 0));
773 /* Returns the current amount of backoff, in seconds. This is the amount of
774 * time after which the rconn will transition from BACKOFF to CONNECTING. */
776 rconn_get_backoff(const struct rconn *rc)
781 /* Returns the number of seconds spent in this state so far. */
783 rconn_get_state_elapsed(const struct rconn *rc)
785 return elapsed_in_this_state(rc);
788 /* Returns 'rc''s current connection sequence number, a number that changes
789 * every time that 'rconn' connects or disconnects. */
791 rconn_get_connection_seqno(const struct rconn *rc)
796 struct rconn_packet_counter *
797 rconn_packet_counter_create(void)
799 struct rconn_packet_counter *c = xmalloc(sizeof *c);
806 rconn_packet_counter_destroy(struct rconn_packet_counter *c)
809 assert(c->ref_cnt > 0);
810 if (!--c->ref_cnt && !c->n) {
817 rconn_packet_counter_inc(struct rconn_packet_counter *c)
823 rconn_packet_counter_dec(struct rconn_packet_counter *c)
826 if (!--c->n && !c->ref_cnt) {
831 /* Set the name of the remote vconn to 'name' and clear out the cached IP
832 * address and port information, since changing the name also likely changes
835 set_vconn_name(struct rconn *rc, const char *name)
838 rc->name = xstrdup(name);
844 /* Tries to send a packet from 'rc''s send buffer. Returns 0 if successful,
845 * otherwise a positive errno value. */
847 try_send(struct rconn *rc)
850 struct ofpbuf *next = rc->txq.head->next;
851 struct rconn_packet_counter *counter = rc->txq.head->private_p;
852 retval = vconn_send(rc->vconn, rc->txq.head);
854 if (retval != EAGAIN) {
855 report_error(rc, retval);
856 disconnect(rc, retval);
860 COVERAGE_INC(rconn_sent);
863 rconn_packet_counter_dec(counter);
865 queue_advance_head(&rc->txq, next);
869 /* Reports that 'error' caused 'rc' to disconnect. 'error' may be a positive
870 * errno value, or it may be EOF to indicate that the connection was closed
873 report_error(struct rconn *rc, int error)
876 /* If 'rc' isn't reliable, then we don't really expect this connection
877 * to last forever anyway (probably it's a connection that we received
878 * via accept()), so use DBG level to avoid cluttering the logs. */
879 enum vlog_level level = rc->reliable ? VLL_INFO : VLL_DBG;
880 VLOG(level, "%s: connection closed by peer", rc->name);
882 VLOG_WARN("%s: connection dropped (%s)", rc->name, strerror(error));
886 /* Disconnects 'rc'. */
888 disconnect(struct rconn *rc, int error OVS_UNUSED)
891 time_t now = time_now();
893 if (rc->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) {
894 vconn_close(rc->vconn);
899 if (now >= rc->backoff_deadline) {
902 rc->backoff = MIN(rc->max_backoff, MAX(1, 2 * rc->backoff));
903 VLOG_INFO("%s: waiting %d seconds before reconnect\n",
904 rc->name, rc->backoff);
906 rc->backoff_deadline = now + rc->backoff;
907 state_transition(rc, S_BACKOFF);
908 if (now - rc->last_connected > 60) {
909 question_connectivity(rc);
912 rconn_disconnect(rc);
916 /* Drops all the packets from 'rc''s send queue and decrements their queue
919 flush_queue(struct rconn *rc)
924 while (rc->txq.n > 0) {
925 struct ofpbuf *b = queue_pop_head(&rc->txq);
926 struct rconn_packet_counter *counter = b->private_p;
928 rconn_packet_counter_dec(counter);
930 COVERAGE_INC(rconn_discarded);
933 poll_immediate_wake();
937 elapsed_in_this_state(const struct rconn *rc)
939 return time_now() - rc->state_entered;
943 timeout(const struct rconn *rc)
946 #define STATE(NAME, VALUE) case S_##NAME: return timeout_##NAME(rc);
955 timed_out(const struct rconn *rc)
957 return time_now() >= sat_add(rc->state_entered, timeout(rc));
961 state_transition(struct rconn *rc, enum state state)
963 rc->seqno += (rc->state == S_ACTIVE) != (state == S_ACTIVE);
964 if (is_connected_state(state) && !is_connected_state(rc->state)) {
965 rc->probably_admitted = false;
967 if (rconn_is_connected(rc)) {
968 rc->total_time_connected += elapsed_in_this_state(rc);
970 VLOG_DBG("%s: entering %s", rc->name, state_name(state));
972 rc->state_entered = time_now();
976 question_connectivity(struct rconn *rc)
978 time_t now = time_now();
979 if (now - rc->last_questioned > 60) {
980 rc->questionable_connectivity = true;
981 rc->last_questioned = now;
986 copy_to_monitor(struct rconn *rc, const struct ofpbuf *b)
988 struct ofpbuf *clone = NULL;
992 for (i = 0; i < rc->n_monitors; ) {
993 struct vconn *vconn = rc->monitors[i];
996 clone = ofpbuf_clone(b);
998 retval = vconn_send(vconn, clone);
1001 } else if (retval != EAGAIN) {
1002 VLOG_DBG("%s: closing monitor connection to %s: %s",
1003 rconn_get_name(rc), vconn_get_name(vconn),
1005 rc->monitors[i] = rc->monitors[--rc->n_monitors];
1010 ofpbuf_delete(clone);
1014 is_connected_state(enum state state)
1016 return (state & (S_ACTIVE | S_IDLE)) != 0;
1020 is_admitted_msg(const struct ofpbuf *b)
1022 struct ofp_header *oh = b->data;
1023 uint8_t type = oh->type;
1025 && (1u << type) & ((1u << OFPT_HELLO) |
1026 (1u << OFPT_ERROR) |
1027 (1u << OFPT_ECHO_REQUEST) |
1028 (1u << OFPT_ECHO_REPLY) |
1029 (1u << OFPT_VENDOR) |
1030 (1u << OFPT_FEATURES_REQUEST) |
1031 (1u << OFPT_FEATURES_REPLY) |
1032 (1u << OFPT_GET_CONFIG_REQUEST) |
1033 (1u << OFPT_GET_CONFIG_REPLY) |
1034 (1u << OFPT_SET_CONFIG)));