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 the secchan 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 /* Messages sent or received are copied to the monitor connections. */
115 #define MAX_MONITORS 8
116 struct vconn
*monitors
[8];
120 static unsigned int elapsed_in_this_state(const struct rconn
*);
121 static unsigned int timeout(const struct rconn
*);
122 static bool timed_out(const struct rconn
*);
123 static void state_transition(struct rconn
*, enum state
);
124 static int try_send(struct rconn
*);
125 static int reconnect(struct rconn
*);
126 static void disconnect(struct rconn
*, int error
);
127 static void flush_queue(struct rconn
*);
128 static void question_connectivity(struct rconn
*);
129 static void copy_to_monitor(struct rconn
*, const struct ofpbuf
*);
130 static bool is_connected_state(enum state
);
131 static bool is_admitted_msg(const struct ofpbuf
*);
133 /* Creates a new rconn, connects it (reliably) to 'name', and returns it. */
135 rconn_new(const char *name
, int inactivity_probe_interval
, int max_backoff
)
137 struct rconn
*rc
= rconn_create(inactivity_probe_interval
, max_backoff
);
138 rconn_connect(rc
, name
);
142 /* Creates a new rconn, connects it (unreliably) to 'vconn', and returns it. */
144 rconn_new_from_vconn(const char *name
, struct vconn
*vconn
)
146 struct rconn
*rc
= rconn_create(60, 0);
147 rconn_connect_unreliably(rc
, name
, vconn
);
151 /* Creates and returns a new rconn.
153 * 'probe_interval' is a number of seconds. If the interval passes once
154 * without an OpenFlow message being received from the peer, the rconn sends
155 * out an "echo request" message. If the interval passes again without a
156 * message being received, the rconn disconnects and re-connects to the peer.
157 * Setting 'probe_interval' to 0 disables this behavior.
159 * 'max_backoff' is the maximum number of seconds between attempts to connect
160 * to the peer. The actual interval starts at 1 second and doubles on each
161 * failure until it reaches 'max_backoff'. If 0 is specified, the default of
162 * 60 seconds is used. */
164 rconn_create(int probe_interval
, int max_backoff
)
166 struct rconn
*rc
= xcalloc(1, sizeof *rc
);
169 rc
->state_entered
= time_now();
172 rc
->name
= xstrdup("void");
173 rc
->reliable
= false;
175 queue_init(&rc
->txq
);
178 rc
->max_backoff
= max_backoff
? max_backoff
: 60;
179 rc
->backoff_deadline
= TIME_MIN
;
180 rc
->last_received
= time_now();
181 rc
->last_connected
= time_now();
184 rc
->packets_sent
= 0;
186 rc
->probably_admitted
= false;
187 rc
->last_admitted
= time_now();
189 rc
->packets_received
= 0;
190 rc
->n_attempted_connections
= 0;
191 rc
->n_successful_connections
= 0;
192 rc
->creation_time
= time_now();
193 rc
->total_time_connected
= 0;
195 rc
->questionable_connectivity
= false;
196 rc
->last_questioned
= time_now();
198 rconn_set_probe_interval(rc
, probe_interval
);
206 rconn_set_max_backoff(struct rconn
*rc
, int max_backoff
)
208 rc
->max_backoff
= MAX(1, max_backoff
);
209 if (rc
->state
== S_BACKOFF
&& rc
->backoff
> max_backoff
) {
210 rc
->backoff
= max_backoff
;
211 if (rc
->backoff_deadline
> time_now() + max_backoff
) {
212 rc
->backoff_deadline
= time_now() + max_backoff
;
218 rconn_get_max_backoff(const struct rconn
*rc
)
220 return rc
->max_backoff
;
224 rconn_set_probe_interval(struct rconn
*rc
, int probe_interval
)
226 rc
->probe_interval
= probe_interval
? MAX(5, probe_interval
) : 0;
230 rconn_get_probe_interval(const struct rconn
*rc
)
232 return rc
->probe_interval
;
236 rconn_connect(struct rconn
*rc
, const char *name
)
238 rconn_disconnect(rc
);
240 rc
->name
= xstrdup(name
);
242 return reconnect(rc
);
246 rconn_connect_unreliably(struct rconn
*rc
,
247 const char *name
, struct vconn
*vconn
)
249 assert(vconn
!= NULL
);
250 rconn_disconnect(rc
);
252 rc
->name
= xstrdup(name
);
253 rc
->reliable
= false;
255 rc
->last_connected
= time_now();
256 state_transition(rc
, S_ACTIVE
);
259 /* If 'rc' is connected, forces it to drop the connection and reconnect. */
261 rconn_reconnect(struct rconn
*rc
)
263 if (rc
->state
& (S_ACTIVE
| S_IDLE
)) {
269 rconn_disconnect(struct rconn
*rc
)
271 if (rc
->state
!= S_VOID
) {
273 vconn_close(rc
->vconn
);
277 rc
->name
= xstrdup("void");
278 rc
->reliable
= false;
281 rc
->backoff_deadline
= TIME_MIN
;
283 state_transition(rc
, S_VOID
);
287 /* Disconnects 'rc' and frees the underlying storage. */
289 rconn_destroy(struct rconn
*rc
)
295 vconn_close(rc
->vconn
);
297 queue_destroy(&rc
->txq
);
298 for (i
= 0; i
< rc
->n_monitors
; i
++) {
299 vconn_close(rc
->monitors
[i
]);
306 timeout_VOID(const struct rconn
*rc UNUSED
)
312 run_VOID(struct rconn
*rc UNUSED
)
318 reconnect(struct rconn
*rc
)
322 VLOG_INFO("%s: connecting...", rc
->name
);
323 rc
->n_attempted_connections
++;
324 retval
= vconn_open(rc
->name
, OFP_VERSION
, &rc
->vconn
);
326 rc
->backoff_deadline
= time_now() + rc
->backoff
;
327 state_transition(rc
, S_CONNECTING
);
329 VLOG_WARN("%s: connection failed (%s)", rc
->name
, strerror(retval
));
330 rc
->backoff_deadline
= TIME_MAX
; /* Prevent resetting backoff. */
337 timeout_BACKOFF(const struct rconn
*rc
)
343 run_BACKOFF(struct rconn
*rc
)
351 timeout_CONNECTING(const struct rconn
*rc
)
353 return MAX(1, rc
->backoff
);
357 run_CONNECTING(struct rconn
*rc
)
359 int retval
= vconn_connect(rc
->vconn
);
361 VLOG_INFO("%s: connected", rc
->name
);
362 rc
->n_successful_connections
++;
363 state_transition(rc
, S_ACTIVE
);
364 rc
->last_connected
= rc
->state_entered
;
365 } else if (retval
!= EAGAIN
) {
366 VLOG_INFO("%s: connection failed (%s)", rc
->name
, strerror(retval
));
367 disconnect(rc
, retval
);
368 } else if (timed_out(rc
)) {
369 VLOG_INFO("%s: connection timed out", rc
->name
);
370 rc
->backoff_deadline
= TIME_MAX
; /* Prevent resetting backoff. */
376 do_tx_work(struct rconn
*rc
)
381 while (rc
->txq
.n
> 0) {
382 int error
= try_send(rc
);
388 poll_immediate_wake();
393 timeout_ACTIVE(const struct rconn
*rc
)
395 if (rc
->probe_interval
) {
396 unsigned int base
= MAX(rc
->last_received
, rc
->state_entered
);
397 unsigned int arg
= base
+ rc
->probe_interval
- rc
->state_entered
;
404 run_ACTIVE(struct rconn
*rc
)
407 unsigned int base
= MAX(rc
->last_received
, rc
->state_entered
);
408 VLOG_DBG("%s: idle %u seconds, sending inactivity probe",
409 rc
->name
, (unsigned int) (time_now() - base
));
411 /* Ordering is important here: rconn_send() can transition to BACKOFF,
412 * and we don't want to transition back to IDLE if so, because then we
413 * can end up queuing a packet with vconn == NULL and then *boom*. */
414 state_transition(rc
, S_IDLE
);
415 rconn_send(rc
, make_echo_request(), NULL
);
423 timeout_IDLE(const struct rconn
*rc
)
425 return rc
->probe_interval
;
429 run_IDLE(struct rconn
*rc
)
432 question_connectivity(rc
);
433 VLOG_ERR("%s: no response to inactivity probe after %u "
434 "seconds, disconnecting",
435 rc
->name
, elapsed_in_this_state(rc
));
442 /* Performs whatever activities are necessary to maintain 'rc': if 'rc' is
443 * disconnected, attempts to (re)connect, backing off as necessary; if 'rc' is
444 * connected, attempts to send packets in the send queue, if any. */
446 rconn_run(struct rconn
*rc
)
450 old_state
= rc
->state
;
452 #define STATE(NAME, VALUE) case S_##NAME: run_##NAME(rc); break;
458 } while (rc
->state
!= old_state
);
461 /* Causes the next call to poll_block() to wake up when rconn_run() should be
464 rconn_run_wait(struct rconn
*rc
)
466 unsigned int timeo
= timeout(rc
);
467 if (timeo
!= UINT_MAX
) {
468 unsigned int expires
= sat_add(rc
->state_entered
, timeo
);
469 unsigned int remaining
= sat_sub(expires
, time_now());
470 poll_timer_wait(sat_mul(remaining
, 1000));
473 if ((rc
->state
& (S_ACTIVE
| S_IDLE
)) && rc
->txq
.n
) {
474 vconn_wait(rc
->vconn
, WAIT_SEND
);
478 /* Attempts to receive a packet from 'rc'. If successful, returns the packet;
479 * otherwise, returns a null pointer. The caller is responsible for freeing
480 * the packet (with ofpbuf_delete()). */
482 rconn_recv(struct rconn
*rc
)
484 if (rc
->state
& (S_ACTIVE
| S_IDLE
)) {
485 struct ofpbuf
*buffer
;
486 int error
= vconn_recv(rc
->vconn
, &buffer
);
488 copy_to_monitor(rc
, buffer
);
489 if (is_admitted_msg(buffer
)
490 || time_now() - rc
->last_connected
>= 30) {
491 rc
->probably_admitted
= true;
492 rc
->last_admitted
= time_now();
494 rc
->last_received
= time_now();
495 rc
->packets_received
++;
496 if (rc
->state
== S_IDLE
) {
497 state_transition(rc
, S_ACTIVE
);
500 } else if (error
!= EAGAIN
) {
501 disconnect(rc
, error
);
507 /* Causes the next call to poll_block() to wake up when a packet may be ready
508 * to be received by vconn_recv() on 'rc'. */
510 rconn_recv_wait(struct rconn
*rc
)
513 vconn_wait(rc
->vconn
, WAIT_RECV
);
517 /* Sends 'b' on 'rc'. Returns 0 if successful (in which case 'b' is
518 * destroyed), or ENOTCONN if 'rc' is not currently connected (in which case
519 * the caller retains ownership of 'b').
521 * If 'counter' is non-null, then 'counter' will be incremented while the
522 * packet is in flight, then decremented when it has been sent (or discarded
523 * due to disconnection). Because 'b' may be sent (or discarded) before this
524 * function returns, the caller may not be able to observe any change in
527 * There is no rconn_send_wait() function: an rconn has a send queue that it
528 * takes care of sending if you call rconn_run(), which will have the side
529 * effect of waking up poll_block(). */
531 rconn_send(struct rconn
*rc
, struct ofpbuf
*b
,
532 struct rconn_packet_counter
*counter
)
534 if (rconn_is_connected(rc
)) {
535 COVERAGE_INC(rconn_queued
);
536 copy_to_monitor(rc
, b
);
537 b
->private = counter
;
539 rconn_packet_counter_inc(counter
);
541 queue_push_tail(&rc
->txq
, b
);
543 /* If the queue was empty before we added 'b', try to send some
544 * packets. (But if the queue had packets in it, it's because the
545 * vconn is backlogged and there's no point in stuffing more into it
546 * now. We'll get back to that in rconn_run().) */
547 if (rc
->txq
.n
== 1) {
556 /* Sends 'b' on 'rc'. Increments 'counter' while the packet is in flight; it
557 * will be decremented when it has been sent (or discarded due to
558 * disconnection). Returns 0 if successful, EAGAIN if 'counter->n' is already
559 * at least as large as 'queue_limit', or ENOTCONN if 'rc' is not currently
560 * connected. Regardless of return value, 'b' is destroyed.
562 * Because 'b' may be sent (or discarded) before this function returns, the
563 * caller may not be able to observe any change in 'counter'.
565 * There is no rconn_send_wait() function: an rconn has a send queue that it
566 * takes care of sending if you call rconn_run(), which will have the side
567 * effect of waking up poll_block(). */
569 rconn_send_with_limit(struct rconn
*rc
, struct ofpbuf
*b
,
570 struct rconn_packet_counter
*counter
, int queue_limit
)
573 retval
= counter
->n
>= queue_limit
? EAGAIN
: rconn_send(rc
, b
, counter
);
575 COVERAGE_INC(rconn_overflow
);
581 /* Returns the total number of packets successfully sent on the underlying
582 * vconn. A packet is not counted as sent while it is still queued in the
583 * rconn, only when it has been successfuly passed to the vconn. */
585 rconn_packets_sent(const struct rconn
*rc
)
587 return rc
->packets_sent
;
590 /* Adds 'vconn' to 'rc' as a monitoring connection, to which all messages sent
591 * and received on 'rconn' will be copied. 'rc' takes ownership of 'vconn'. */
593 rconn_add_monitor(struct rconn
*rc
, struct vconn
*vconn
)
595 if (rc
->n_monitors
< ARRAY_SIZE(rc
->monitors
)) {
596 VLOG_INFO("new monitor connection from %s", vconn_get_name(vconn
));
597 rc
->monitors
[rc
->n_monitors
++] = vconn
;
599 VLOG_DBG("too many monitor connections, discarding %s",
600 vconn_get_name(vconn
));
605 /* Returns 'rc''s name (the 'name' argument passed to rconn_new()). */
607 rconn_get_name(const struct rconn
*rc
)
612 /* Returns true if 'rconn' is connected or in the process of reconnecting,
613 * false if 'rconn' is disconnected and will not reconnect on its own. */
615 rconn_is_alive(const struct rconn
*rconn
)
617 return rconn
->state
!= S_VOID
;
620 /* Returns true if 'rconn' is connected, false otherwise. */
622 rconn_is_connected(const struct rconn
*rconn
)
624 return is_connected_state(rconn
->state
);
627 /* Returns 0 if 'rconn' is connected. Otherwise, if 'rconn' is in a "failure
628 * mode" (that is, it is not connected), returns the number of seconds that it
629 * has been in failure mode, ignoring any times that it connected but the
630 * controller's admission control policy caused it to be quickly
633 rconn_failure_duration(const struct rconn
*rconn
)
635 return rconn_is_connected(rconn
) ? 0 : time_now() - rconn
->last_admitted
;
638 /* Returns the IP address of the peer, or 0 if the peer is not connected over
639 * an IP-based protocol or if its IP address is not known. */
641 rconn_get_ip(const struct rconn
*rconn
)
643 return rconn
->vconn
? vconn_get_ip(rconn
->vconn
) : 0;
646 /* If 'rconn' can't connect to the peer, it could be for any number of reasons.
647 * Usually, one would assume it is because the peer is not running or because
648 * the network is partitioned. But it could also be because the network
649 * topology has changed, in which case the upper layer will need to reassess it
650 * (in particular, obtain a new IP address via DHCP and find the new location
651 * of the controller). When this appears that this might be the case, this
652 * function returns true. It also clears the questionability flag and prevents
653 * it from being set again for some time. */
655 rconn_is_connectivity_questionable(struct rconn
*rconn
)
657 bool questionable
= rconn
->questionable_connectivity
;
658 rconn
->questionable_connectivity
= false;
662 /* Returns the total number of packets successfully received by the underlying
665 rconn_packets_received(const struct rconn
*rc
)
667 return rc
->packets_received
;
670 /* Returns a string representing the internal state of 'rc'. The caller must
671 * not modify or free the string. */
673 rconn_get_state(const struct rconn
*rc
)
675 return state_name(rc
->state
);
678 /* Returns the number of connection attempts made by 'rc', including any
679 * ongoing attempt that has not yet succeeded or failed. */
681 rconn_get_attempted_connections(const struct rconn
*rc
)
683 return rc
->n_attempted_connections
;
686 /* Returns the number of successful connection attempts made by 'rc'. */
688 rconn_get_successful_connections(const struct rconn
*rc
)
690 return rc
->n_successful_connections
;
693 /* Returns the time at which the last successful connection was made by
696 rconn_get_last_connection(const struct rconn
*rc
)
698 return rc
->last_connected
;
701 /* Returns the time at which 'rc' was created. */
703 rconn_get_creation_time(const struct rconn
*rc
)
705 return rc
->creation_time
;
708 /* Returns the approximate number of seconds that 'rc' has been connected. */
710 rconn_get_total_time_connected(const struct rconn
*rc
)
712 return (rc
->total_time_connected
713 + (rconn_is_connected(rc
) ? elapsed_in_this_state(rc
) : 0));
716 /* Returns the current amount of backoff, in seconds. This is the amount of
717 * time after which the rconn will transition from BACKOFF to CONNECTING. */
719 rconn_get_backoff(const struct rconn
*rc
)
724 /* Returns the number of seconds spent in this state so far. */
726 rconn_get_state_elapsed(const struct rconn
*rc
)
728 return elapsed_in_this_state(rc
);
731 /* Returns 'rc''s current connection sequence number, a number that changes
732 * every time that 'rconn' connects or disconnects. */
734 rconn_get_connection_seqno(const struct rconn
*rc
)
739 struct rconn_packet_counter
*
740 rconn_packet_counter_create(void)
742 struct rconn_packet_counter
*c
= xmalloc(sizeof *c
);
749 rconn_packet_counter_destroy(struct rconn_packet_counter
*c
)
752 assert(c
->ref_cnt
> 0);
753 if (!--c
->ref_cnt
&& !c
->n
) {
760 rconn_packet_counter_inc(struct rconn_packet_counter
*c
)
766 rconn_packet_counter_dec(struct rconn_packet_counter
*c
)
769 if (!--c
->n
&& !c
->ref_cnt
) {
774 /* Tries to send a packet from 'rc''s send buffer. Returns 0 if successful,
775 * otherwise a positive errno value. */
777 try_send(struct rconn
*rc
)
780 struct ofpbuf
*next
= rc
->txq
.head
->next
;
781 struct rconn_packet_counter
*counter
= rc
->txq
.head
->private;
782 retval
= vconn_send(rc
->vconn
, rc
->txq
.head
);
784 if (retval
!= EAGAIN
) {
785 disconnect(rc
, retval
);
789 COVERAGE_INC(rconn_sent
);
792 rconn_packet_counter_dec(counter
);
794 queue_advance_head(&rc
->txq
, next
);
798 /* Disconnects 'rc'. 'error' is used only for logging purposes. If it is
799 * nonzero, then it should be EOF to indicate the connection was closed by the
800 * peer in a normal fashion or a positive errno value. */
802 disconnect(struct rconn
*rc
, int error
)
805 time_t now
= time_now();
807 if (rc
->state
& (S_CONNECTING
| S_ACTIVE
| S_IDLE
)) {
809 VLOG_WARN("%s: connection dropped (%s)",
810 rc
->name
, strerror(error
));
811 } else if (error
== EOF
) {
813 VLOG_INFO("%s: connection closed by peer", rc
->name
);
816 VLOG_INFO("%s: connection dropped", rc
->name
);
818 vconn_close(rc
->vconn
);
823 if (now
>= rc
->backoff_deadline
) {
826 rc
->backoff
= MIN(rc
->max_backoff
, MAX(1, 2 * rc
->backoff
));
827 VLOG_INFO("%s: waiting %d seconds before reconnect\n",
828 rc
->name
, rc
->backoff
);
830 rc
->backoff_deadline
= now
+ rc
->backoff
;
831 state_transition(rc
, S_BACKOFF
);
832 if (now
- rc
->last_connected
> 60) {
833 question_connectivity(rc
);
836 rconn_disconnect(rc
);
840 /* Drops all the packets from 'rc''s send queue and decrements their queue
843 flush_queue(struct rconn
*rc
)
848 while (rc
->txq
.n
> 0) {
849 struct ofpbuf
*b
= queue_pop_head(&rc
->txq
);
850 struct rconn_packet_counter
*counter
= b
->private;
852 rconn_packet_counter_dec(counter
);
854 COVERAGE_INC(rconn_discarded
);
857 poll_immediate_wake();
861 elapsed_in_this_state(const struct rconn
*rc
)
863 return time_now() - rc
->state_entered
;
867 timeout(const struct rconn
*rc
)
870 #define STATE(NAME, VALUE) case S_##NAME: return timeout_##NAME(rc);
879 timed_out(const struct rconn
*rc
)
881 return time_now() >= sat_add(rc
->state_entered
, timeout(rc
));
885 state_transition(struct rconn
*rc
, enum state state
)
887 rc
->seqno
+= (rc
->state
== S_ACTIVE
) != (state
== S_ACTIVE
);
888 if (is_connected_state(state
) && !is_connected_state(rc
->state
)) {
889 rc
->probably_admitted
= false;
891 if (rconn_is_connected(rc
)) {
892 rc
->total_time_connected
+= elapsed_in_this_state(rc
);
894 VLOG_DBG("%s: entering %s", rc
->name
, state_name(state
));
896 rc
->state_entered
= time_now();
900 question_connectivity(struct rconn
*rc
)
902 time_t now
= time_now();
903 if (now
- rc
->last_questioned
> 60) {
904 rc
->questionable_connectivity
= true;
905 rc
->last_questioned
= now
;
910 copy_to_monitor(struct rconn
*rc
, const struct ofpbuf
*b
)
912 struct ofpbuf
*clone
= NULL
;
916 for (i
= 0; i
< rc
->n_monitors
; ) {
917 struct vconn
*vconn
= rc
->monitors
[i
];
920 clone
= ofpbuf_clone(b
);
922 retval
= vconn_send(vconn
, clone
);
925 } else if (retval
!= EAGAIN
) {
926 VLOG_DBG("%s: closing monitor connection to %s: %s",
927 rconn_get_name(rc
), vconn_get_name(vconn
),
929 rc
->monitors
[i
] = rc
->monitors
[--rc
->n_monitors
];
934 ofpbuf_delete(clone
);
938 is_connected_state(enum state state
)
940 return (state
& (S_ACTIVE
| S_IDLE
)) != 0;
944 is_admitted_msg(const struct ofpbuf
*b
)
946 struct ofp_header
*oh
= b
->data
;
947 uint8_t type
= oh
->type
;
949 && (1u << type
) & ((1u << OFPT_HELLO
) |
951 (1u << OFPT_ECHO_REQUEST
) |
952 (1u << OFPT_ECHO_REPLY
) |
953 (1u << OFPT_VENDOR
) |
954 (1u << OFPT_FEATURES_REQUEST
) |
955 (1u << OFPT_FEATURES_REPLY
) |
956 (1u << OFPT_GET_CONFIG_REQUEST
) |
957 (1u << OFPT_GET_CONFIG_REPLY
) |
958 (1u << OFPT_SET_CONFIG
)));