2 * Copyright (c) 2008, 2009 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 disconnect(struct rconn *, int error);
140 static void flush_queue(struct rconn *);
141 static void question_connectivity(struct rconn *);
142 static void copy_to_monitor(struct rconn *, const struct ofpbuf *);
143 static bool is_connected_state(enum state);
144 static bool is_admitted_msg(const struct ofpbuf *);
146 /* Creates a new rconn, connects it (reliably) to 'name', and returns it. */
148 rconn_new(const char *name, int inactivity_probe_interval, int max_backoff)
150 struct rconn *rc = rconn_create(inactivity_probe_interval, max_backoff);
151 rconn_connect(rc, name);
155 /* Creates a new rconn, connects it (unreliably) to 'vconn', and returns it. */
157 rconn_new_from_vconn(const char *name, struct vconn *vconn)
159 struct rconn *rc = rconn_create(60, 0);
160 rconn_connect_unreliably(rc, name, vconn);
164 /* Creates and returns a new rconn.
166 * 'probe_interval' is a number of seconds. If the interval passes once
167 * without an OpenFlow message being received from the peer, the rconn sends
168 * out an "echo request" message. If the interval passes again without a
169 * message being received, the rconn disconnects and re-connects to the peer.
170 * Setting 'probe_interval' to 0 disables this behavior.
172 * 'max_backoff' is the maximum number of seconds between attempts to connect
173 * to the peer. The actual interval starts at 1 second and doubles on each
174 * failure until it reaches 'max_backoff'. If 0 is specified, the default of
175 * 8 seconds is used. */
177 rconn_create(int probe_interval, int max_backoff)
179 struct rconn *rc = xzalloc(sizeof *rc);
182 rc->state_entered = time_now();
185 rc->name = xstrdup("void");
186 rc->reliable = false;
188 queue_init(&rc->txq);
191 rc->max_backoff = max_backoff ? max_backoff : 8;
192 rc->backoff_deadline = TIME_MIN;
193 rc->last_received = time_now();
194 rc->last_connected = time_now();
197 rc->packets_sent = 0;
199 rc->probably_admitted = false;
200 rc->last_admitted = time_now();
202 rc->packets_received = 0;
203 rc->n_attempted_connections = 0;
204 rc->n_successful_connections = 0;
205 rc->creation_time = time_now();
206 rc->total_time_connected = 0;
208 rc->questionable_connectivity = false;
209 rc->last_questioned = time_now();
211 rconn_set_probe_interval(rc, probe_interval);
219 rconn_set_max_backoff(struct rconn *rc, int max_backoff)
221 rc->max_backoff = MAX(1, max_backoff);
222 if (rc->state == S_BACKOFF && rc->backoff > max_backoff) {
223 rc->backoff = max_backoff;
224 if (rc->backoff_deadline > time_now() + max_backoff) {
225 rc->backoff_deadline = time_now() + max_backoff;
231 rconn_get_max_backoff(const struct rconn *rc)
233 return rc->max_backoff;
237 rconn_set_probe_interval(struct rconn *rc, int probe_interval)
239 rc->probe_interval = probe_interval ? MAX(5, probe_interval) : 0;
243 rconn_get_probe_interval(const struct rconn *rc)
245 return rc->probe_interval;
249 rconn_connect(struct rconn *rc, const char *name)
251 rconn_disconnect(rc);
252 set_vconn_name(rc, name);
254 return reconnect(rc);
258 rconn_connect_unreliably(struct rconn *rc,
259 const char *name, struct vconn *vconn)
261 assert(vconn != NULL);
262 rconn_disconnect(rc);
263 set_vconn_name(rc, name);
264 rc->reliable = false;
266 rc->last_connected = time_now();
267 state_transition(rc, S_ACTIVE);
270 /* If 'rc' is connected, forces it to drop the connection and reconnect. */
272 rconn_reconnect(struct rconn *rc)
274 if (rc->state & (S_ACTIVE | S_IDLE)) {
280 rconn_disconnect(struct rconn *rc)
282 if (rc->state != S_VOID) {
284 vconn_close(rc->vconn);
287 set_vconn_name(rc, "void");
288 rc->reliable = false;
291 rc->backoff_deadline = TIME_MIN;
293 state_transition(rc, S_VOID);
297 /* Disconnects 'rc' and frees the underlying storage. */
299 rconn_destroy(struct rconn *rc)
305 vconn_close(rc->vconn);
307 queue_destroy(&rc->txq);
308 for (i = 0; i < rc->n_monitors; i++) {
309 vconn_close(rc->monitors[i]);
316 timeout_VOID(const struct rconn *rc UNUSED)
322 run_VOID(struct rconn *rc UNUSED)
328 reconnect(struct rconn *rc)
332 VLOG_INFO("%s: connecting...", rc->name);
333 rc->n_attempted_connections++;
334 retval = vconn_open(rc->name, OFP_VERSION, &rc->vconn);
336 rc->remote_ip = vconn_get_remote_ip(rc->vconn);
337 rc->local_ip = vconn_get_local_ip(rc->vconn);
338 rc->remote_port = vconn_get_remote_port(rc->vconn);
339 rc->backoff_deadline = time_now() + rc->backoff;
340 state_transition(rc, S_CONNECTING);
342 VLOG_WARN("%s: connection failed (%s)", rc->name, strerror(retval));
343 rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
350 timeout_BACKOFF(const struct rconn *rc)
356 run_BACKOFF(struct rconn *rc)
364 timeout_CONNECTING(const struct rconn *rc)
366 return MAX(1, rc->backoff);
370 run_CONNECTING(struct rconn *rc)
372 int retval = vconn_connect(rc->vconn);
374 VLOG_INFO("%s: connected", rc->name);
375 rc->n_successful_connections++;
376 state_transition(rc, S_ACTIVE);
377 rc->last_connected = rc->state_entered;
378 } else if (retval != EAGAIN) {
379 VLOG_INFO("%s: connection failed (%s)", rc->name, strerror(retval));
380 disconnect(rc, retval);
381 } else if (timed_out(rc)) {
382 VLOG_INFO("%s: connection timed out", rc->name);
383 rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
389 do_tx_work(struct rconn *rc)
394 while (rc->txq.n > 0) {
395 int error = try_send(rc);
401 poll_immediate_wake();
406 timeout_ACTIVE(const struct rconn *rc)
408 if (rc->probe_interval) {
409 unsigned int base = MAX(rc->last_received, rc->state_entered);
410 unsigned int arg = base + rc->probe_interval - rc->state_entered;
417 run_ACTIVE(struct rconn *rc)
420 unsigned int base = MAX(rc->last_received, rc->state_entered);
421 VLOG_DBG("%s: idle %u seconds, sending inactivity probe",
422 rc->name, (unsigned int) (time_now() - base));
424 /* Ordering is important here: rconn_send() can transition to BACKOFF,
425 * and we don't want to transition back to IDLE if so, because then we
426 * can end up queuing a packet with vconn == NULL and then *boom*. */
427 state_transition(rc, S_IDLE);
428 rconn_send(rc, make_echo_request(), NULL);
436 timeout_IDLE(const struct rconn *rc)
438 return rc->probe_interval;
442 run_IDLE(struct rconn *rc)
445 question_connectivity(rc);
446 VLOG_ERR("%s: no response to inactivity probe after %u "
447 "seconds, disconnecting",
448 rc->name, elapsed_in_this_state(rc));
455 /* Performs whatever activities are necessary to maintain 'rc': if 'rc' is
456 * disconnected, attempts to (re)connect, backing off as necessary; if 'rc' is
457 * connected, attempts to send packets in the send queue, if any. */
459 rconn_run(struct rconn *rc)
465 vconn_run(rc->vconn);
467 for (i = 0; i < rc->n_monitors; i++) {
468 vconn_run(rc->monitors[i]);
472 old_state = rc->state;
474 #define STATE(NAME, VALUE) case S_##NAME: run_##NAME(rc); break;
480 } while (rc->state != old_state);
483 /* Causes the next call to poll_block() to wake up when rconn_run() should be
486 rconn_run_wait(struct rconn *rc)
492 vconn_run_wait(rc->vconn);
494 for (i = 0; i < rc->n_monitors; i++) {
495 vconn_run_wait(rc->monitors[i]);
499 if (timeo != UINT_MAX) {
500 unsigned int expires = sat_add(rc->state_entered, timeo);
501 unsigned int remaining = sat_sub(expires, time_now());
502 poll_timer_wait(sat_mul(remaining, 1000));
505 if ((rc->state & (S_ACTIVE | S_IDLE)) && rc->txq.n) {
506 vconn_wait(rc->vconn, WAIT_SEND);
510 /* Attempts to receive a packet from 'rc'. If successful, returns the packet;
511 * otherwise, returns a null pointer. The caller is responsible for freeing
512 * the packet (with ofpbuf_delete()). */
514 rconn_recv(struct rconn *rc)
516 if (rc->state & (S_ACTIVE | S_IDLE)) {
517 struct ofpbuf *buffer;
518 int error = vconn_recv(rc->vconn, &buffer);
520 copy_to_monitor(rc, buffer);
521 if (rc->probably_admitted || is_admitted_msg(buffer)
522 || time_now() - rc->last_connected >= 30) {
523 rc->probably_admitted = true;
524 rc->last_admitted = time_now();
526 rc->last_received = time_now();
527 rc->packets_received++;
528 if (rc->state == S_IDLE) {
529 state_transition(rc, S_ACTIVE);
532 } else if (error != EAGAIN) {
533 disconnect(rc, error);
539 /* Causes the next call to poll_block() to wake up when a packet may be ready
540 * to be received by vconn_recv() on 'rc'. */
542 rconn_recv_wait(struct rconn *rc)
545 vconn_wait(rc->vconn, WAIT_RECV);
549 /* Sends 'b' on 'rc'. Returns 0 if successful (in which case 'b' is
550 * destroyed), or ENOTCONN if 'rc' is not currently connected (in which case
551 * the caller retains ownership of 'b').
553 * If 'counter' is non-null, then 'counter' will be incremented while the
554 * packet is in flight, then decremented when it has been sent (or discarded
555 * due to disconnection). Because 'b' may be sent (or discarded) before this
556 * function returns, the caller may not be able to observe any change in
559 * There is no rconn_send_wait() function: an rconn has a send queue that it
560 * takes care of sending if you call rconn_run(), which will have the side
561 * effect of waking up poll_block(). */
563 rconn_send(struct rconn *rc, struct ofpbuf *b,
564 struct rconn_packet_counter *counter)
566 if (rconn_is_connected(rc)) {
567 COVERAGE_INC(rconn_queued);
568 copy_to_monitor(rc, b);
569 b->private = counter;
571 rconn_packet_counter_inc(counter);
573 queue_push_tail(&rc->txq, b);
575 /* If the queue was empty before we added 'b', try to send some
576 * packets. (But if the queue had packets in it, it's because the
577 * vconn is backlogged and there's no point in stuffing more into it
578 * now. We'll get back to that in rconn_run().) */
579 if (rc->txq.n == 1) {
588 /* Sends 'b' on 'rc'. Increments 'counter' while the packet is in flight; it
589 * will be decremented when it has been sent (or discarded due to
590 * disconnection). Returns 0 if successful, EAGAIN if 'counter->n' is already
591 * at least as large as 'queue_limit', or ENOTCONN if 'rc' is not currently
592 * connected. Regardless of return value, 'b' is destroyed.
594 * Because 'b' may be sent (or discarded) before this function returns, the
595 * caller may not be able to observe any change in 'counter'.
597 * There is no rconn_send_wait() function: an rconn has a send queue that it
598 * takes care of sending if you call rconn_run(), which will have the side
599 * effect of waking up poll_block(). */
601 rconn_send_with_limit(struct rconn *rc, struct ofpbuf *b,
602 struct rconn_packet_counter *counter, int queue_limit)
605 retval = counter->n >= queue_limit ? EAGAIN : rconn_send(rc, b, counter);
607 COVERAGE_INC(rconn_overflow);
613 /* Returns the total number of packets successfully sent on the underlying
614 * vconn. A packet is not counted as sent while it is still queued in the
615 * rconn, only when it has been successfuly passed to the vconn. */
617 rconn_packets_sent(const struct rconn *rc)
619 return rc->packets_sent;
622 /* Adds 'vconn' to 'rc' as a monitoring connection, to which all messages sent
623 * and received on 'rconn' will be copied. 'rc' takes ownership of 'vconn'. */
625 rconn_add_monitor(struct rconn *rc, struct vconn *vconn)
627 if (rc->n_monitors < ARRAY_SIZE(rc->monitors)) {
628 VLOG_INFO("new monitor connection from %s", vconn_get_name(vconn));
629 rc->monitors[rc->n_monitors++] = vconn;
631 VLOG_DBG("too many monitor connections, discarding %s",
632 vconn_get_name(vconn));
637 /* Returns 'rc''s name (the 'name' argument passed to rconn_new()). */
639 rconn_get_name(const struct rconn *rc)
644 /* Returns true if 'rconn' is connected or in the process of reconnecting,
645 * false if 'rconn' is disconnected and will not reconnect on its own. */
647 rconn_is_alive(const struct rconn *rconn)
649 return rconn->state != S_VOID;
652 /* Returns true if 'rconn' is connected, false otherwise. */
654 rconn_is_connected(const struct rconn *rconn)
656 return is_connected_state(rconn->state);
659 /* Returns true if 'rconn' is connected and thought to have been accepted by
660 * the peer's admission-control policy. */
662 rconn_is_admitted(const struct rconn *rconn)
664 return (rconn_is_connected(rconn)
665 && rconn->last_admitted >= rconn->last_connected);
668 /* Returns 0 if 'rconn' is currently connected and considered to have been
669 * accepted by the peer's admission-control policy, otherwise the number of
670 * seconds since 'rconn' was last in such a state. */
672 rconn_failure_duration(const struct rconn *rconn)
674 return rconn_is_admitted(rconn) ? 0 : time_now() - rconn->last_admitted;
677 /* Returns the IP address of the peer, or 0 if the peer's IP address is not
680 rconn_get_remote_ip(const struct rconn *rconn)
682 return rconn->remote_ip;
685 /* Returns the transport port of the peer, or 0 if the peer's port is not
688 rconn_get_remote_port(const struct rconn *rconn)
690 return rconn->remote_port;
693 /* Returns the IP address used to connect to the peer, or 0 if the
694 * connection is not an IP-based protocol or if its IP address is not
697 rconn_get_local_ip(const struct rconn *rconn)
699 return rconn->local_ip;
702 /* Returns the transport port used to connect to the peer, or 0 if the
703 * connection does not contain a port or if the port is not known. */
705 rconn_get_local_port(const struct rconn *rconn)
707 return rconn->vconn ? vconn_get_local_port(rconn->vconn) : 0;
710 /* If 'rconn' can't connect to the peer, it could be for any number of reasons.
711 * Usually, one would assume it is because the peer is not running or because
712 * the network is partitioned. But it could also be because the network
713 * topology has changed, in which case the upper layer will need to reassess it
714 * (in particular, obtain a new IP address via DHCP and find the new location
715 * of the controller). When this appears that this might be the case, this
716 * function returns true. It also clears the questionability flag and prevents
717 * it from being set again for some time. */
719 rconn_is_connectivity_questionable(struct rconn *rconn)
721 bool questionable = rconn->questionable_connectivity;
722 rconn->questionable_connectivity = false;
726 /* Returns the total number of packets successfully received by the underlying
729 rconn_packets_received(const struct rconn *rc)
731 return rc->packets_received;
734 /* Returns a string representing the internal state of 'rc'. The caller must
735 * not modify or free the string. */
737 rconn_get_state(const struct rconn *rc)
739 return state_name(rc->state);
742 /* Returns the number of connection attempts made by 'rc', including any
743 * ongoing attempt that has not yet succeeded or failed. */
745 rconn_get_attempted_connections(const struct rconn *rc)
747 return rc->n_attempted_connections;
750 /* Returns the number of successful connection attempts made by 'rc'. */
752 rconn_get_successful_connections(const struct rconn *rc)
754 return rc->n_successful_connections;
757 /* Returns the time at which the last successful connection was made by
760 rconn_get_last_connection(const struct rconn *rc)
762 return rc->last_connected;
765 /* Returns the time at which the last OpenFlow message was received by 'rc'.
766 * If no packets have been received on 'rc', returns the time at which 'rc'
769 rconn_get_last_received(const struct rconn *rc)
771 return rc->last_received;
774 /* Returns the time at which 'rc' was created. */
776 rconn_get_creation_time(const struct rconn *rc)
778 return rc->creation_time;
781 /* Returns the approximate number of seconds that 'rc' has been connected. */
783 rconn_get_total_time_connected(const struct rconn *rc)
785 return (rc->total_time_connected
786 + (rconn_is_connected(rc) ? elapsed_in_this_state(rc) : 0));
789 /* Returns the current amount of backoff, in seconds. This is the amount of
790 * time after which the rconn will transition from BACKOFF to CONNECTING. */
792 rconn_get_backoff(const struct rconn *rc)
797 /* Returns the number of seconds spent in this state so far. */
799 rconn_get_state_elapsed(const struct rconn *rc)
801 return elapsed_in_this_state(rc);
804 /* Returns 'rc''s current connection sequence number, a number that changes
805 * every time that 'rconn' connects or disconnects. */
807 rconn_get_connection_seqno(const struct rconn *rc)
812 struct rconn_packet_counter *
813 rconn_packet_counter_create(void)
815 struct rconn_packet_counter *c = xmalloc(sizeof *c);
822 rconn_packet_counter_destroy(struct rconn_packet_counter *c)
825 assert(c->ref_cnt > 0);
826 if (!--c->ref_cnt && !c->n) {
833 rconn_packet_counter_inc(struct rconn_packet_counter *c)
839 rconn_packet_counter_dec(struct rconn_packet_counter *c)
842 if (!--c->n && !c->ref_cnt) {
847 /* Set the name of the remote vconn to 'name' and clear out the cached IP
848 * address and port information, since changing the name also likely changes
851 set_vconn_name(struct rconn *rc, const char *name)
854 rc->name = xstrdup(name);
860 /* Tries to send a packet from 'rc''s send buffer. Returns 0 if successful,
861 * otherwise a positive errno value. */
863 try_send(struct rconn *rc)
866 struct ofpbuf *next = rc->txq.head->next;
867 struct rconn_packet_counter *counter = rc->txq.head->private;
868 retval = vconn_send(rc->vconn, rc->txq.head);
870 if (retval != EAGAIN) {
871 disconnect(rc, retval);
875 COVERAGE_INC(rconn_sent);
878 rconn_packet_counter_dec(counter);
880 queue_advance_head(&rc->txq, next);
884 /* Disconnects 'rc'. 'error' is used only for logging purposes. If it is
885 * nonzero, then it should be EOF to indicate the connection was closed by the
886 * peer in a normal fashion or a positive errno value. */
888 disconnect(struct rconn *rc, int error)
891 time_t now = time_now();
893 if (rc->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) {
895 VLOG_WARN("%s: connection dropped (%s)",
896 rc->name, strerror(error));
897 } else if (error == EOF) {
899 VLOG_INFO("%s: connection closed by peer", rc->name);
902 VLOG_INFO("%s: connection dropped", rc->name);
904 vconn_close(rc->vconn);
909 if (now >= rc->backoff_deadline) {
912 rc->backoff = MIN(rc->max_backoff, MAX(1, 2 * rc->backoff));
913 VLOG_INFO("%s: waiting %d seconds before reconnect\n",
914 rc->name, rc->backoff);
916 rc->backoff_deadline = now + rc->backoff;
917 state_transition(rc, S_BACKOFF);
918 if (now - rc->last_connected > 60) {
919 question_connectivity(rc);
922 rconn_disconnect(rc);
926 /* Drops all the packets from 'rc''s send queue and decrements their queue
929 flush_queue(struct rconn *rc)
934 while (rc->txq.n > 0) {
935 struct ofpbuf *b = queue_pop_head(&rc->txq);
936 struct rconn_packet_counter *counter = b->private;
938 rconn_packet_counter_dec(counter);
940 COVERAGE_INC(rconn_discarded);
943 poll_immediate_wake();
947 elapsed_in_this_state(const struct rconn *rc)
949 return time_now() - rc->state_entered;
953 timeout(const struct rconn *rc)
956 #define STATE(NAME, VALUE) case S_##NAME: return timeout_##NAME(rc);
965 timed_out(const struct rconn *rc)
967 return time_now() >= sat_add(rc->state_entered, timeout(rc));
971 state_transition(struct rconn *rc, enum state state)
973 rc->seqno += (rc->state == S_ACTIVE) != (state == S_ACTIVE);
974 if (is_connected_state(state) && !is_connected_state(rc->state)) {
975 rc->probably_admitted = false;
977 if (rconn_is_connected(rc)) {
978 rc->total_time_connected += elapsed_in_this_state(rc);
980 VLOG_DBG("%s: entering %s", rc->name, state_name(state));
982 rc->state_entered = time_now();
986 question_connectivity(struct rconn *rc)
988 time_t now = time_now();
989 if (now - rc->last_questioned > 60) {
990 rc->questionable_connectivity = true;
991 rc->last_questioned = now;
996 copy_to_monitor(struct rconn *rc, const struct ofpbuf *b)
998 struct ofpbuf *clone = NULL;
1002 for (i = 0; i < rc->n_monitors; ) {
1003 struct vconn *vconn = rc->monitors[i];
1006 clone = ofpbuf_clone(b);
1008 retval = vconn_send(vconn, clone);
1011 } else if (retval != EAGAIN) {
1012 VLOG_DBG("%s: closing monitor connection to %s: %s",
1013 rconn_get_name(rc), vconn_get_name(vconn),
1015 rc->monitors[i] = rc->monitors[--rc->n_monitors];
1020 ofpbuf_delete(clone);
1024 is_connected_state(enum state state)
1026 return (state & (S_ACTIVE | S_IDLE)) != 0;
1030 is_admitted_msg(const struct ofpbuf *b)
1032 struct ofp_header *oh = b->data;
1033 uint8_t type = oh->type;
1035 && (1u << type) & ((1u << OFPT_HELLO) |
1036 (1u << OFPT_ERROR) |
1037 (1u << OFPT_ECHO_REQUEST) |
1038 (1u << OFPT_ECHO_REPLY) |
1039 (1u << OFPT_VENDOR) |
1040 (1u << OFPT_FEATURES_REQUEST) |
1041 (1u << OFPT_FEATURES_REPLY) |
1042 (1u << OFPT_GET_CONFIG_REQUEST) |
1043 (1u << OFPT_GET_CONFIG_REPLY) |
1044 (1u << OFPT_SET_CONFIG)));