· 6 years ago · Mar 13, 2019, 05:12 PM
1/*
2 * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
3 *
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:
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17#include <config.h>
18
19#include "connmgr.h"
20
21#include <errno.h>
22#include <stdlib.h>
23
24#include "coverage.h"
25#include "fail-open.h"
26#include "in-band.h"
27#include "odp-util.h"
28#include "ofp-actions.h"
29#include "ofp-msgs.h"
30#include "ofp-util.h"
31#include "ofpbuf.h"
32#include "ofproto-provider.h"
33#include "pinsched.h"
34#include "poll-loop.h"
35#include "pktbuf.h"
36#include "rconn.h"
37#include "shash.h"
38#include "simap.h"
39#include "stream.h"
40#include "timeval.h"
41#include "vconn.h"
42#include "vlog.h"
43
44VLOG_DEFINE_THIS_MODULE(connmgr);
45static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
46
47/* An OpenFlow connection. */
48struct ofconn {
49/* Configuration that persists from one connection to the next. */
50
51 struct list node; /* In struct connmgr's "all_conns" list. */
52 struct hmap_node hmap_node; /* In struct connmgr's "controllers" map. */
53
54 struct connmgr *connmgr; /* Connection's manager. */
55 struct rconn *rconn; /* OpenFlow connection. */
56 enum ofconn_type type; /* Type. */
57 enum ofproto_band band; /* In-band or out-of-band? */
58 bool enable_async_msgs; /* Initially enable async messages? */
59
60/* State that should be cleared from one connection to the next. */
61
62 /* OpenFlow state. */
63 enum ofp12_controller_role role; /* Role. */
64 enum ofputil_protocol protocol; /* Current protocol variant. */
65 enum nx_packet_in_format packet_in_format; /* OFPT_PACKET_IN format. */
66
67 /* Asynchronous flow table operation support. */
68 struct list opgroups; /* Contains pending "ofopgroups", if any. */
69 struct ofpbuf *blocked; /* Postponed OpenFlow message, if any. */
70 bool retry; /* True if 'blocked' is ready to try again. */
71
72 /* OFPT_PACKET_IN related data. */
73 struct rconn_packet_counter *packet_in_counter; /* # queued on 'rconn'. */
74#define N_SCHEDULERS 2
75 struct pinsched *schedulers[N_SCHEDULERS];
76 struct pktbuf *pktbuf; /* OpenFlow packet buffers. */
77 int miss_send_len; /* Bytes to send of buffered packets. */
78 uint16_t controller_id; /* Connection controller ID. */
79
80 /* Number of OpenFlow messages queued on 'rconn' as replies to OpenFlow
81 * requests, and the maximum number before we stop reading OpenFlow
82 * requests. */
83#define OFCONN_REPLY_MAX 100
84 struct rconn_packet_counter *reply_counter;
85
86 /* Asynchronous message configuration in each possible roles.
87 *
88 * A 1-bit enables sending an asynchronous message for one possible reason
89 * that the message might be generated, a 0-bit disables it. */
90 uint32_t master_async_config[OAM_N_TYPES]; /* master, other */
91 uint32_t slave_async_config[OAM_N_TYPES]; /* slave */
92
93 /* Flow monitors. */
94 struct hmap monitors; /* Contains "struct ofmonitor"s. */
95 struct list updates; /* List of "struct ofpbuf"s. */
96 bool sent_abbrev_update; /* Does 'updates' contain NXFME_ABBREV? */
97 struct rconn_packet_counter *monitor_counter;
98 uint64_t monitor_paused;
99};
100
101static struct ofconn *ofconn_create(struct connmgr *, struct rconn *,
102 enum ofconn_type, bool enable_async_msgs);
103static void ofconn_destroy(struct ofconn *);
104static void ofconn_flush(struct ofconn *);
105
106static void ofconn_reconfigure(struct ofconn *,
107 const struct ofproto_controller *);
108
109static void ofconn_run(struct ofconn *,
110 bool (*handle_openflow)(struct ofconn *,
111 struct ofpbuf *ofp_msg));
112static void ofconn_wait(struct ofconn *, bool handling_openflow);
113
114static const char *ofconn_get_target(const struct ofconn *);
115static char *ofconn_make_name(const struct connmgr *, const char *target);
116
117static void ofconn_set_rate_limit(struct ofconn *, int rate, int burst);
118
119static void ofconn_send(const struct ofconn *, struct ofpbuf *,
120 struct rconn_packet_counter *);
121
122static void do_send_packet_in(struct ofpbuf *, void *ofconn_);
123
124/* A listener for incoming OpenFlow "service" connections. */
125struct ofservice {
126 struct hmap_node node; /* In struct connmgr's "services" hmap. */
127 struct pvconn *pvconn; /* OpenFlow connection listener. */
128
129 /* These are not used by ofservice directly. They are settings for
130 * accepted "struct ofconn"s from the pvconn. */
131 int probe_interval; /* Max idle time before probing, in seconds. */
132 int rate_limit; /* Max packet-in rate in packets per second. */
133 int burst_limit; /* Limit on accumulating packet credits. */
134 bool enable_async_msgs; /* Initially enable async messages? */
135 uint8_t dscp; /* DSCP Value for controller connection */
136 uint32_t allowed_versions; /* OpenFlow protocol versions that may
137 * be negotiated for a session. */
138};
139
140static void ofservice_reconfigure(struct ofservice *,
141 const struct ofproto_controller *);
142static int ofservice_create(struct connmgr *mgr, const char *target,
143 uint32_t allowed_versions, uint8_t dscp);
144static void ofservice_destroy(struct connmgr *, struct ofservice *);
145static struct ofservice *ofservice_lookup(struct connmgr *,
146 const char *target);
147
148/* Connection manager for an OpenFlow switch. */
149struct connmgr {
150 struct ofproto *ofproto;
151 char *name;
152 char *local_port_name;
153
154 /* OpenFlow connections. */
155 struct hmap controllers; /* Controller "struct ofconn"s. */
156 struct list all_conns; /* Contains "struct ofconn"s. */
157 uint64_t master_election_id; /* monotonically increasing sequence number
158 * for master election */
159 bool master_election_id_defined;
160
161 /* OpenFlow listeners. */
162 struct hmap services; /* Contains "struct ofservice"s. */
163 struct pvconn **snoops;
164 size_t n_snoops;
165
166 /* Fail open. */
167 struct fail_open *fail_open;
168 enum ofproto_fail_mode fail_mode;
169
170 /* In-band control. */
171 struct in_band *in_band;
172 struct sockaddr_in *extra_in_band_remotes;
173 size_t n_extra_remotes;
174 int in_band_queue;
175};
176
177static void update_in_band_remotes(struct connmgr *);
178static void add_snooper(struct connmgr *, struct vconn *);
179static void ofmonitor_run(struct connmgr *);
180static void ofmonitor_wait(struct connmgr *);
181
182/* Creates and returns a new connection manager owned by 'ofproto'. 'name' is
183 * a name for the ofproto suitable for using in log messages.
184 * 'local_port_name' is the name of the local port (OFPP_LOCAL) within
185 * 'ofproto'. */
186struct connmgr *
187connmgr_create(struct ofproto *ofproto,
188 const char *name, const char *local_port_name)
189{
190 struct connmgr *mgr;
191
192 mgr = xmalloc(sizeof *mgr);
193 mgr->ofproto = ofproto;
194 mgr->name = xstrdup(name);
195 mgr->local_port_name = xstrdup(local_port_name);
196
197 hmap_init(&mgr->controllers);
198 list_init(&mgr->all_conns);
199 mgr->master_election_id = 0;
200 mgr->master_election_id_defined = false;
201
202 hmap_init(&mgr->services);
203 mgr->snoops = NULL;
204 mgr->n_snoops = 0;
205
206 mgr->fail_open = NULL;
207 mgr->fail_mode = OFPROTO_FAIL_SECURE;
208
209 mgr->in_band = NULL;
210 mgr->extra_in_band_remotes = NULL;
211 mgr->n_extra_remotes = 0;
212 mgr->in_band_queue = -1;
213
214 return mgr;
215}
216
217/* Frees 'mgr' and all of its resources. */
218void
219connmgr_destroy(struct connmgr *mgr)
220{
221 struct ofservice *ofservice, *next_ofservice;
222 struct ofconn *ofconn, *next_ofconn;
223 size_t i;
224
225 if (!mgr) {
226 return;
227 }
228
229 LIST_FOR_EACH_SAFE (ofconn, next_ofconn, node, &mgr->all_conns) {
230 ofconn_destroy(ofconn);
231 }
232 hmap_destroy(&mgr->controllers);
233
234 HMAP_FOR_EACH_SAFE (ofservice, next_ofservice, node, &mgr->services) {
235 ofservice_destroy(mgr, ofservice);
236 }
237 hmap_destroy(&mgr->services);
238
239 for (i = 0; i < mgr->n_snoops; i++) {
240 pvconn_close(mgr->snoops[i]);
241 }
242 free(mgr->snoops);
243
244 fail_open_destroy(mgr->fail_open);
245 mgr->fail_open = NULL;
246
247 in_band_destroy(mgr->in_band);
248 mgr->in_band = NULL;
249 free(mgr->extra_in_band_remotes);
250 free(mgr->name);
251 free(mgr->local_port_name);
252
253 free(mgr);
254}
255
256/* Does all of the periodic maintenance required by 'mgr'.
257 *
258 * If 'handle_openflow' is nonnull, calls 'handle_openflow' for each message
259 * received on an OpenFlow connection, passing along the OpenFlow connection
260 * itself and the message that was sent. If 'handle_openflow' returns true,
261 * the message is considered to be fully processed. If 'handle_openflow'
262 * returns false, the message is considered not to have been processed at all;
263 * it will be stored and re-presented to 'handle_openflow' following the next
264 * call to connmgr_retry(). 'handle_openflow' must not modify or free the
265 * message.
266 *
267 * If 'handle_openflow' is NULL, no OpenFlow messages will be processed and
268 * other activities that could affect the flow table (in-band processing,
269 * fail-open processing) are suppressed too. */
270void
271connmgr_run(struct connmgr *mgr,
272 bool (*handle_openflow)(struct ofconn *, struct ofpbuf *ofp_msg))
273{
274 struct ofconn *ofconn, *next_ofconn;
275 struct ofservice *ofservice;
276 size_t i;
277
278 if (handle_openflow && mgr->in_band) {
279 if (!in_band_run(mgr->in_band)) {
280 in_band_destroy(mgr->in_band);
281 mgr->in_band = NULL;
282 }
283 }
284
285 LIST_FOR_EACH_SAFE (ofconn, next_ofconn, node, &mgr->all_conns) {
286 ofconn_run(ofconn, handle_openflow);
287 }
288 ofmonitor_run(mgr);
289
290 /* Fail-open maintenance. Do this after processing the ofconns since
291 * fail-open checks the status of the controller rconn. */
292 if (handle_openflow && mgr->fail_open) {
293 fail_open_run(mgr->fail_open);
294 }
295
296 HMAP_FOR_EACH (ofservice, node, &mgr->services) {
297 struct vconn *vconn;
298 int retval;
299
300 retval = pvconn_accept(ofservice->pvconn, &vconn);
301 if (!retval) {
302 struct rconn *rconn;
303 char *name;
304
305 /* Passing default value for creation of the rconn */
306 rconn = rconn_create(ofservice->probe_interval, 0, ofservice->dscp,
307 vconn_get_allowed_versions(vconn));
308 name = ofconn_make_name(mgr, vconn_get_name(vconn));
309 rconn_connect_unreliably(rconn, vconn, name);
310 free(name);
311
312 ofconn = ofconn_create(mgr, rconn, OFCONN_SERVICE,
313 ofservice->enable_async_msgs);
314 ofconn_set_rate_limit(ofconn, ofservice->rate_limit,
315 ofservice->burst_limit);
316 } else if (retval != EAGAIN) {
317 VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval));
318 }
319 }
320
321 for (i = 0; i < mgr->n_snoops; i++) {
322 struct vconn *vconn;
323 int retval;
324
325 retval = pvconn_accept(mgr->snoops[i], &vconn);
326 if (!retval) {
327 add_snooper(mgr, vconn);
328 } else if (retval != EAGAIN) {
329 VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval));
330 }
331 }
332}
333
334/* Causes the poll loop to wake up when connmgr_run() needs to run.
335 *
336 * If 'handling_openflow' is true, arriving OpenFlow messages and other
337 * activities that affect the flow table will wake up the poll loop. If
338 * 'handling_openflow' is false, they will not. */
339void
340connmgr_wait(struct connmgr *mgr, bool handling_openflow)
341{
342 struct ofservice *ofservice;
343 struct ofconn *ofconn;
344 size_t i;
345
346 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
347 ofconn_wait(ofconn, handling_openflow);
348 }
349 ofmonitor_wait(mgr);
350 if (handling_openflow && mgr->in_band) {
351 in_band_wait(mgr->in_band);
352 }
353 if (handling_openflow && mgr->fail_open) {
354 fail_open_wait(mgr->fail_open);
355 }
356 HMAP_FOR_EACH (ofservice, node, &mgr->services) {
357 pvconn_wait(ofservice->pvconn);
358 }
359 for (i = 0; i < mgr->n_snoops; i++) {
360 pvconn_wait(mgr->snoops[i]);
361 }
362}
363
364/* Adds some memory usage statistics for 'mgr' into 'usage', for use with
365 * memory_report(). */
366void
367connmgr_get_memory_usage(const struct connmgr *mgr, struct simap *usage)
368{
369 const struct ofconn *ofconn;
370 unsigned int packets = 0;
371 unsigned int ofconns = 0;
372
373 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
374 int i;
375
376 ofconns++;
377
378 packets += rconn_count_txqlen(ofconn->rconn);
379 for (i = 0; i < N_SCHEDULERS; i++) {
380 packets += pinsched_count_txqlen(ofconn->schedulers[i]);
381 }
382 packets += pktbuf_count_packets(ofconn->pktbuf);
383 }
384 simap_increase(usage, "ofconns", ofconns);
385 simap_increase(usage, "packets", packets);
386}
387
388/* Returns the ofproto that owns 'ofconn''s connmgr. */
389struct ofproto *
390ofconn_get_ofproto(const struct ofconn *ofconn)
391{
392 return ofconn->connmgr->ofproto;
393}
394
395/* If processing of OpenFlow messages was blocked on any 'mgr' ofconns by
396 * returning false to the 'handle_openflow' callback to connmgr_run(), this
397 * re-enables them. */
398void
399connmgr_retry(struct connmgr *mgr)
400{
401 struct ofconn *ofconn;
402
403 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
404 ofconn->retry = true;
405 }
406}
407
408/* OpenFlow configuration. */
409
410static void add_controller(struct connmgr *, const char *target, uint8_t dscp,
411 uint32_t allowed_versions);
412static struct ofconn *find_controller_by_target(struct connmgr *,
413 const char *target);
414static void update_fail_open(struct connmgr *);
415static int set_pvconns(struct pvconn ***pvconnsp, size_t *n_pvconnsp,
416 const struct sset *);
417
418/* Returns true if 'mgr' has any configured primary controllers.
419 *
420 * Service controllers do not count, but configured primary controllers do
421 * count whether or not they are currently connected. */
422bool
423connmgr_has_controllers(const struct connmgr *mgr)
424{
425 return !hmap_is_empty(&mgr->controllers);
426}
427
428/* Initializes 'info' and populates it with information about each configured
429 * primary controller. The keys in 'info' are the controllers' targets; the
430 * data values are corresponding "struct ofproto_controller_info".
431 *
432 * The caller owns 'info' and everything in it and should free it when it is no
433 * longer needed. */
434void
435connmgr_get_controller_info(struct connmgr *mgr, struct shash *info)
436{
437 const struct ofconn *ofconn;
438
439 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
440 const struct rconn *rconn = ofconn->rconn;
441 const char *target = rconn_get_target(rconn);
442
443 if (!shash_find(info, target)) {
444 struct ofproto_controller_info *cinfo = xmalloc(sizeof *cinfo);
445 time_t now = time_now();
446 time_t last_connection = rconn_get_last_connection(rconn);
447 time_t last_disconnect = rconn_get_last_disconnect(rconn);
448 int last_error = rconn_get_last_error(rconn);
449
450 shash_add(info, target, cinfo);
451
452 cinfo->is_connected = rconn_is_connected(rconn);
453 cinfo->role = ofconn->role;
454
455 cinfo->pairs.n = 0;
456
457 if (last_error) {
458 cinfo->pairs.keys[cinfo->pairs.n] = "last_error";
459 cinfo->pairs.values[cinfo->pairs.n++]
460 = xstrdup(ovs_retval_to_string(last_error));
461 }
462
463 cinfo->pairs.keys[cinfo->pairs.n] = "state";
464 cinfo->pairs.values[cinfo->pairs.n++]
465 = xstrdup(rconn_get_state(rconn));
466
467 if (last_connection != TIME_MIN) {
468 cinfo->pairs.keys[cinfo->pairs.n] = "sec_since_connect";
469 cinfo->pairs.values[cinfo->pairs.n++]
470 = xasprintf("%ld", (long int) (now - last_connection));
471 }
472
473 if (last_disconnect != TIME_MIN) {
474 cinfo->pairs.keys[cinfo->pairs.n] = "sec_since_disconnect";
475 cinfo->pairs.values[cinfo->pairs.n++]
476 = xasprintf("%ld", (long int) (now - last_disconnect));
477 }
478 }
479 }
480}
481
482void
483connmgr_free_controller_info(struct shash *info)
484{
485 struct shash_node *node;
486
487 SHASH_FOR_EACH (node, info) {
488 struct ofproto_controller_info *cinfo = node->data;
489 while (cinfo->pairs.n) {
490 free(CONST_CAST(char *, cinfo->pairs.values[--cinfo->pairs.n]));
491 }
492 free(cinfo);
493 }
494 shash_destroy(info);
495}
496
497/* Changes 'mgr''s set of controllers to the 'n_controllers' controllers in
498 * 'controllers'. */
499void
500connmgr_set_controllers(struct connmgr *mgr,
501 const struct ofproto_controller *controllers,
502 size_t n_controllers, uint32_t allowed_versions)
503{
504 bool had_controllers = connmgr_has_controllers(mgr);
505 struct shash new_controllers;
506 struct ofconn *ofconn, *next_ofconn;
507 struct ofservice *ofservice, *next_ofservice;
508 size_t i;
509
510 /* Create newly configured controllers and services.
511 * Create a name to ofproto_controller mapping in 'new_controllers'. */
512 shash_init(&new_controllers);
513 for (i = 0; i < n_controllers; i++) {
514 const struct ofproto_controller *c = &controllers[i];
515
516 if (!vconn_verify_name(c->target)) {
517 bool add = false;
518 ofconn = find_controller_by_target(mgr, c->target);
519 if (!ofconn) {
520 VLOG_INFO("%s: added primary controller \"%s\"",
521 mgr->name, c->target);
522 add = true;
523 } else if (rconn_get_allowed_versions(ofconn->rconn) !=
524 allowed_versions) {
525 VLOG_INFO("%s: re-added primary controller \"%s\"",
526 mgr->name, c->target);
527 add = true;
528 ofconn_destroy(ofconn);
529 }
530 if (add) {
531 add_controller(mgr, c->target, c->dscp, allowed_versions);
532 }
533 } else if (!pvconn_verify_name(c->target)) {
534 bool add = false;
535 ofservice = ofservice_lookup(mgr, c->target);
536 if (!ofservice) {
537 VLOG_INFO("%s: added service controller \"%s\"",
538 mgr->name, c->target);
539 add = true;
540 } else if (ofservice->allowed_versions != allowed_versions) {
541 VLOG_INFO("%s: re-added service controller \"%s\"",
542 mgr->name, c->target);
543 ofservice_destroy(mgr, ofservice);
544 add = true;
545 }
546 if (add) {
547 ofservice_create(mgr, c->target, allowed_versions, c->dscp);
548 }
549 } else {
550 VLOG_WARN_RL(&rl, "%s: unsupported controller \"%s\"",
551 mgr->name, c->target);
552 continue;
553 }
554
555 shash_add_once(&new_controllers, c->target, &controllers[i]);
556 }
557
558 /* Delete controllers that are no longer configured.
559 * Update configuration of all now-existing controllers. */
560 HMAP_FOR_EACH_SAFE (ofconn, next_ofconn, hmap_node, &mgr->controllers) {
561 const char *target = ofconn_get_target(ofconn);
562 struct ofproto_controller *c;
563
564 c = shash_find_data(&new_controllers, target);
565 if (!c) {
566 VLOG_INFO("%s: removed primary controller \"%s\"",
567 mgr->name, target);
568 ofconn_destroy(ofconn);
569 } else {
570 ofconn_reconfigure(ofconn, c);
571 }
572 }
573
574 /* Delete services that are no longer configured.
575 * Update configuration of all now-existing services. */
576 HMAP_FOR_EACH_SAFE (ofservice, next_ofservice, node, &mgr->services) {
577 const char *target = pvconn_get_name(ofservice->pvconn);
578 struct ofproto_controller *c;
579
580 c = shash_find_data(&new_controllers, target);
581 if (!c) {
582 VLOG_INFO("%s: removed service controller \"%s\"",
583 mgr->name, target);
584 ofservice_destroy(mgr, ofservice);
585 } else {
586 ofservice_reconfigure(ofservice, c);
587 }
588 }
589
590 shash_destroy(&new_controllers);
591
592 update_in_band_remotes(mgr);
593 update_fail_open(mgr);
594 if (had_controllers != connmgr_has_controllers(mgr)) {
595 ofproto_flush_flows(mgr->ofproto);
596 }
597}
598
599/* Drops the connections between 'mgr' and all of its primary and secondary
600 * controllers, forcing them to reconnect. */
601void
602connmgr_reconnect(const struct connmgr *mgr)
603{
604 struct ofconn *ofconn;
605
606 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
607 rconn_reconnect(ofconn->rconn);
608 }
609}
610
611/* Sets the "snoops" for 'mgr' to the pvconn targets listed in 'snoops'.
612 *
613 * A "snoop" is a pvconn to which every OpenFlow message to or from the most
614 * important controller on 'mgr' is mirrored. */
615int
616connmgr_set_snoops(struct connmgr *mgr, const struct sset *snoops)
617{
618 return set_pvconns(&mgr->snoops, &mgr->n_snoops, snoops);
619}
620
621/* Adds each of the snoops currently configured on 'mgr' to 'snoops'. */
622void
623connmgr_get_snoops(const struct connmgr *mgr, struct sset *snoops)
624{
625 size_t i;
626
627 for (i = 0; i < mgr->n_snoops; i++) {
628 sset_add(snoops, pvconn_get_name(mgr->snoops[i]));
629 }
630}
631
632/* Returns true if 'mgr' has at least one snoop, false if it has none. */
633bool
634connmgr_has_snoops(const struct connmgr *mgr)
635{
636 return mgr->n_snoops > 0;
637}
638
639/* Creates a new controller for 'target' in 'mgr'. update_controller() needs
640 * to be called later to finish the new ofconn's configuration. */
641static void
642add_controller(struct connmgr *mgr, const char *target, uint8_t dscp,
643 uint32_t allowed_versions)
644{
645 char *name = ofconn_make_name(mgr, target);
646 struct ofconn *ofconn;
647
648 ofconn = ofconn_create(mgr, rconn_create(5, 8, dscp, allowed_versions),
649 OFCONN_PRIMARY, true);
650 ofconn->pktbuf = pktbuf_create();
651 rconn_connect(ofconn->rconn, target, name);
652 hmap_insert(&mgr->controllers, &ofconn->hmap_node, hash_string(target, 0));
653
654 free(name);
655}
656
657static struct ofconn *
658find_controller_by_target(struct connmgr *mgr, const char *target)
659{
660 struct ofconn *ofconn;
661
662 HMAP_FOR_EACH_WITH_HASH (ofconn, hmap_node,
663 hash_string(target, 0), &mgr->controllers) {
664 if (!strcmp(ofconn_get_target(ofconn), target)) {
665 return ofconn;
666 }
667 }
668 return NULL;
669}
670
671static void
672update_in_band_remotes(struct connmgr *mgr)
673{
674 struct sockaddr_in *addrs;
675 size_t max_addrs, n_addrs;
676 struct ofconn *ofconn;
677 size_t i;
678
679 /* Allocate enough memory for as many remotes as we could possibly have. */
680 max_addrs = mgr->n_extra_remotes + hmap_count(&mgr->controllers);
681 addrs = xmalloc(max_addrs * sizeof *addrs);
682 n_addrs = 0;
683
684 /* Add all the remotes. */
685 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
686 struct sockaddr_in *sin = &addrs[n_addrs];
687 const char *target = rconn_get_target(ofconn->rconn);
688
689 if (ofconn->band == OFPROTO_OUT_OF_BAND) {
690 continue;
691 }
692
693 if (stream_parse_target_with_default_ports(target,
694 OFP_TCP_PORT,
695 OFP_SSL_PORT,
696 sin)) {
697 n_addrs++;
698 }
699 }
700 for (i = 0; i < mgr->n_extra_remotes; i++) {
701 addrs[n_addrs++] = mgr->extra_in_band_remotes[i];
702 }
703
704 /* Create or update or destroy in-band. */
705 if (n_addrs) {
706 if (!mgr->in_band) {
707 in_band_create(mgr->ofproto, mgr->local_port_name, &mgr->in_band);
708 }
709 in_band_set_queue(mgr->in_band, mgr->in_band_queue);
710 } else {
711 /* in_band_run() needs a chance to delete any existing in-band flows.
712 * We will destroy mgr->in_band after it's done with that. */
713 }
714 if (mgr->in_band) {
715 in_band_set_remotes(mgr->in_band, addrs, n_addrs);
716 }
717
718 /* Clean up. */
719 free(addrs);
720}
721
722static void
723update_fail_open(struct connmgr *mgr)
724{
725 if (connmgr_has_controllers(mgr)
726 && mgr->fail_mode == OFPROTO_FAIL_STANDALONE) {
727 if (!mgr->fail_open) {
728 mgr->fail_open = fail_open_create(mgr->ofproto, mgr);
729 }
730 } else {
731 fail_open_destroy(mgr->fail_open);
732 mgr->fail_open = NULL;
733 }
734}
735
736static int
737set_pvconns(struct pvconn ***pvconnsp, size_t *n_pvconnsp,
738 const struct sset *sset)
739{
740 struct pvconn **pvconns = *pvconnsp;
741 size_t n_pvconns = *n_pvconnsp;
742 const char *name;
743 int retval = 0;
744 size_t i;
745
746 for (i = 0; i < n_pvconns; i++) {
747 pvconn_close(pvconns[i]);
748 }
749 free(pvconns);
750
751 pvconns = xmalloc(sset_count(sset) * sizeof *pvconns);
752 n_pvconns = 0;
753 SSET_FOR_EACH (name, sset) {
754 struct pvconn *pvconn;
755 int error;
756 error = pvconn_open(name, 0, 0, &pvconn);
757 if (!error) {
758 pvconns[n_pvconns++] = pvconn;
759 } else {
760 VLOG_ERR("failed to listen on %s: %s", name, strerror(error));
761 if (!retval) {
762 retval = error;
763 }
764 }
765 }
766
767 *pvconnsp = pvconns;
768 *n_pvconnsp = n_pvconns;
769
770 return retval;
771}
772
773/* Returns a "preference level" for snooping 'ofconn'. A higher return value
774 * means that 'ofconn' is more interesting for monitoring than a lower return
775 * value. */
776static int
777snoop_preference(const struct ofconn *ofconn)
778{
779 switch (ofconn->role) {
780 case OFPCR12_ROLE_MASTER:
781 return 3;
782 case OFPCR12_ROLE_EQUAL:
783 return 2;
784 case OFPCR12_ROLE_SLAVE:
785 return 1;
786 case OFPCR12_ROLE_NOCHANGE:
787 default:
788 /* Shouldn't happen. */
789 return 0;
790 }
791}
792
793/* One of 'mgr''s "snoop" pvconns has accepted a new connection on 'vconn'.
794 * Connects this vconn to a controller. */
795static void
796add_snooper(struct connmgr *mgr, struct vconn *vconn)
797{
798 struct ofconn *ofconn, *best;
799
800 /* Pick a controller for monitoring. */
801 best = NULL;
802 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
803 if (ofconn->type == OFCONN_PRIMARY
804 && (!best || snoop_preference(ofconn) > snoop_preference(best))) {
805 best = ofconn;
806 }
807 }
808
809 if (best) {
810 rconn_add_monitor(best->rconn, vconn);
811 } else {
812 VLOG_INFO_RL(&rl, "no controller connection to snoop");
813 vconn_close(vconn);
814 }
815}
816
817/* Public ofconn functions. */
818
819/* Returns the connection type, either OFCONN_PRIMARY or OFCONN_SERVICE. */
820enum ofconn_type
821ofconn_get_type(const struct ofconn *ofconn)
822{
823 return ofconn->type;
824}
825
826/* If a master election id is defined, stores it into '*idp' and returns
827 * true. Otherwise, stores UINT64_MAX into '*idp' and returns false. */
828bool
829ofconn_get_master_election_id(const struct ofconn *ofconn, uint64_t *idp)
830{
831 *idp = (ofconn->connmgr->master_election_id_defined
832 ? ofconn->connmgr->master_election_id
833 : UINT64_MAX);
834 return ofconn->connmgr->master_election_id_defined;
835}
836
837/* Sets the master election id.
838 *
839 * Returns true if successful, false if the id is stale
840 */
841bool
842ofconn_set_master_election_id(struct ofconn *ofconn, uint64_t id)
843{
844 if (ofconn->connmgr->master_election_id_defined
845 &&
846 /* Unsigned difference interpreted as a two's complement signed
847 * value */
848 (int64_t)(id - ofconn->connmgr->master_election_id) < 0) {
849 return false;
850 }
851 ofconn->connmgr->master_election_id = id;
852 ofconn->connmgr->master_election_id_defined = true;
853
854 return true;
855}
856
857/* Returns the role configured for 'ofconn'.
858 *
859 * The default role, if no other role has been set, is OFPCR12_ROLE_EQUAL. */
860enum ofp12_controller_role
861ofconn_get_role(const struct ofconn *ofconn)
862{
863 return ofconn->role;
864}
865
866/* Changes 'ofconn''s role to 'role'. If 'role' is OFPCR12_ROLE_MASTER then
867 * any existing master is demoted to a slave. */
868void
869ofconn_set_role(struct ofconn *ofconn, enum ofp12_controller_role role)
870{
871 if (role == OFPCR12_ROLE_MASTER) {
872 struct ofconn *other;
873
874 HMAP_FOR_EACH (other, hmap_node, &ofconn->connmgr->controllers) {
875 if (other->role == OFPCR12_ROLE_MASTER) {
876 other->role = OFPCR12_ROLE_SLAVE;
877 }
878 }
879 }
880 ofconn->role = role;
881}
882
883void
884ofconn_set_invalid_ttl_to_controller(struct ofconn *ofconn, bool enable)
885{
886 uint32_t bit = 1u << OFPR_INVALID_TTL;
887 if (enable) {
888 ofconn->master_async_config[OAM_PACKET_IN] |= bit;
889 } else {
890 ofconn->master_async_config[OAM_PACKET_IN] &= ~bit;
891 }
892}
893
894bool
895ofconn_get_invalid_ttl_to_controller(struct ofconn *ofconn)
896{
897 uint32_t bit = 1u << OFPR_INVALID_TTL;
898 return (ofconn->master_async_config[OAM_PACKET_IN] & bit) != 0;
899}
900
901/* Returns the currently configured protocol for 'ofconn', one of OFPUTIL_P_*.
902 *
903 * Returns OFPUTIL_P_NONE, which is not a valid protocol, if 'ofconn' hasn't
904 * completed version negotiation. This can't happen if at least one OpenFlow
905 * message, other than OFPT_HELLO, has been received on the connection (such as
906 * in ofproto.c's message handling code), since version negotiation is a
907 * prerequisite for starting to receive messages. This means that
908 * OFPUTIL_P_NONE is a special case that most callers need not worry about. */
909enum ofputil_protocol
910ofconn_get_protocol(const struct ofconn *ofconn)
911{
912 if (ofconn->protocol == OFPUTIL_P_NONE &&
913 rconn_is_connected(ofconn->rconn)) {
914 int version = rconn_get_version(ofconn->rconn);
915 if (version > 0) {
916 ofconn_set_protocol(CONST_CAST(struct ofconn *, ofconn),
917 ofputil_protocol_from_ofp_version(version));
918 }
919 }
920
921 return ofconn->protocol;
922}
923
924/* Sets the protocol for 'ofconn' to 'protocol' (one of OFPUTIL_P_*).
925 *
926 * (This doesn't actually send anything to accomplish this. Presumably the
927 * caller already did that.) */
928void
929ofconn_set_protocol(struct ofconn *ofconn, enum ofputil_protocol protocol)
930{
931 ofconn->protocol = protocol;
932}
933
934/* Returns the currently configured packet in format for 'ofconn', one of
935 * NXPIF_*.
936 *
937 * The default, if no other format has been set, is NXPIF_OPENFLOW10. */
938enum nx_packet_in_format
939ofconn_get_packet_in_format(struct ofconn *ofconn)
940{
941 return ofconn->packet_in_format;
942}
943
944/* Sets the packet in format for 'ofconn' to 'packet_in_format' (one of
945 * NXPIF_*). */
946void
947ofconn_set_packet_in_format(struct ofconn *ofconn,
948 enum nx_packet_in_format packet_in_format)
949{
950 ofconn->packet_in_format = packet_in_format;
951}
952
953/* Sets the controller connection ID for 'ofconn' to 'controller_id'.
954 *
955 * The connection controller ID is used for OFPP_CONTROLLER and
956 * NXAST_CONTROLLER actions. See "struct nx_action_controller" for details. */
957void
958ofconn_set_controller_id(struct ofconn *ofconn, uint16_t controller_id)
959{
960 ofconn->controller_id = controller_id;
961}
962
963/* Returns the default miss send length for 'ofconn'. */
964int
965ofconn_get_miss_send_len(const struct ofconn *ofconn)
966{
967 return ofconn->miss_send_len;
968}
969
970/* Sets the default miss send length for 'ofconn' to 'miss_send_len'. */
971void
972ofconn_set_miss_send_len(struct ofconn *ofconn, int miss_send_len)
973{
974 ofconn->miss_send_len = miss_send_len;
975}
976
977void
978ofconn_set_async_config(struct ofconn *ofconn,
979 const uint32_t master_masks[OAM_N_TYPES],
980 const uint32_t slave_masks[OAM_N_TYPES])
981{
982 size_t size = sizeof ofconn->master_async_config;
983 memcpy(ofconn->master_async_config, master_masks, size);
984 memcpy(ofconn->slave_async_config, slave_masks, size);
985}
986
987/* Sends 'msg' on 'ofconn', accounting it as a reply. (If there is a
988 * sufficient number of OpenFlow replies in-flight on a single ofconn, then the
989 * connmgr will stop accepting new OpenFlow requests on that ofconn until the
990 * controller has accepted some of the replies.) */
991void
992ofconn_send_reply(const struct ofconn *ofconn, struct ofpbuf *msg)
993{
994 ofconn_send(ofconn, msg, ofconn->reply_counter);
995}
996
997/* Sends each of the messages in list 'replies' on 'ofconn' in order,
998 * accounting them as replies. */
999void
1000ofconn_send_replies(const struct ofconn *ofconn, struct list *replies)
1001{
1002 struct ofpbuf *reply, *next;
1003
1004 LIST_FOR_EACH_SAFE (reply, next, list_node, replies) {
1005 list_remove(&reply->list_node);
1006 ofconn_send_reply(ofconn, reply);
1007 }
1008}
1009
1010/* Sends 'error' on 'ofconn', as a reply to 'request'. Only at most the
1011 * first 64 bytes of 'request' are used. */
1012void
1013ofconn_send_error(const struct ofconn *ofconn,
1014 const struct ofp_header *request, enum ofperr error)
1015{
1016 static struct vlog_rate_limit err_rl = VLOG_RATE_LIMIT_INIT(10, 10);
1017 struct ofpbuf *reply;
1018
1019 reply = ofperr_encode_reply(error, request);
1020 if (!VLOG_DROP_INFO(&err_rl)) {
1021 const char *type_name;
1022 size_t request_len;
1023 enum ofpraw raw;
1024
1025 request_len = ntohs(request->length);
1026 type_name = (!ofpraw_decode_partial(&raw, request,
1027 MIN(64, request_len))
1028 ? ofpraw_get_name(raw)
1029 : "invalid");
1030
1031 VLOG_INFO("%s: sending %s error reply to %s message",
1032 rconn_get_name(ofconn->rconn), ofperr_to_string(error),
1033 type_name);
1034 }
1035 ofconn_send_reply(ofconn, reply);
1036}
1037
1038/* Same as pktbuf_retrieve(), using the pktbuf owned by 'ofconn'. */
1039enum ofperr
1040ofconn_pktbuf_retrieve(struct ofconn *ofconn, uint32_t id,
1041 struct ofpbuf **bufferp, uint16_t *in_port)
1042{
1043 return pktbuf_retrieve(ofconn->pktbuf, id, bufferp, in_port);
1044}
1045
1046/* Returns true if 'ofconn' has any pending opgroups. */
1047bool
1048ofconn_has_pending_opgroups(const struct ofconn *ofconn)
1049{
1050 return !list_is_empty(&ofconn->opgroups);
1051}
1052
1053/* Adds 'ofconn_node' to 'ofconn''s list of pending opgroups.
1054 *
1055 * If 'ofconn' is destroyed or its connection drops, then 'ofconn' will remove
1056 * 'ofconn_node' from the list and re-initialize it with list_init(). The
1057 * client may, therefore, use list_is_empty(ofconn_node) to determine whether
1058 * 'ofconn_node' is still associated with an active ofconn.
1059 *
1060 * The client may also remove ofconn_node from the list itself, with
1061 * list_remove(). */
1062void
1063ofconn_add_opgroup(struct ofconn *ofconn, struct list *ofconn_node)
1064{
1065 list_push_back(&ofconn->opgroups, ofconn_node);
1066}
1067
1068/* Private ofconn functions. */
1069
1070static const char *
1071ofconn_get_target(const struct ofconn *ofconn)
1072{
1073 return rconn_get_target(ofconn->rconn);
1074}
1075
1076static struct ofconn *
1077ofconn_create(struct connmgr *mgr, struct rconn *rconn, enum ofconn_type type,
1078 bool enable_async_msgs)
1079{
1080 struct ofconn *ofconn;
1081
1082 ofconn = xzalloc(sizeof *ofconn);
1083 ofconn->connmgr = mgr;
1084 list_push_back(&mgr->all_conns, &ofconn->node);
1085 ofconn->rconn = rconn;
1086 ofconn->type = type;
1087 ofconn->enable_async_msgs = enable_async_msgs;
1088
1089 list_init(&ofconn->opgroups);
1090
1091 hmap_init(&ofconn->monitors);
1092 list_init(&ofconn->updates);
1093
1094 ofconn_flush(ofconn);
1095
1096 return ofconn;
1097}
1098
1099/* Clears all of the state in 'ofconn' that should not persist from one
1100 * connection to the next. */
1101static void
1102ofconn_flush(struct ofconn *ofconn)
1103{
1104 struct ofmonitor *monitor, *next_monitor;
1105 int i;
1106
1107 ofconn->role = OFPCR12_ROLE_EQUAL;
1108 ofconn_set_protocol(ofconn, OFPUTIL_P_NONE);
1109 ofconn->packet_in_format = NXPIF_OPENFLOW10;
1110
1111 /* Disassociate 'ofconn' from all of the ofopgroups that it initiated that
1112 * have not yet completed. (Those ofopgroups will still run to completion
1113 * in the usual way, but any errors that they run into will not be reported
1114 * on any OpenFlow channel.)
1115 *
1116 * Also discard any blocked operation on 'ofconn'. */
1117 while (!list_is_empty(&ofconn->opgroups)) {
1118 list_init(list_pop_front(&ofconn->opgroups));
1119 }
1120 ofpbuf_delete(ofconn->blocked);
1121 ofconn->blocked = NULL;
1122
1123 rconn_packet_counter_destroy(ofconn->packet_in_counter);
1124 ofconn->packet_in_counter = rconn_packet_counter_create();
1125 for (i = 0; i < N_SCHEDULERS; i++) {
1126 if (ofconn->schedulers[i]) {
1127 int rate, burst;
1128
1129 pinsched_get_limits(ofconn->schedulers[i], &rate, &burst);
1130 pinsched_destroy(ofconn->schedulers[i]);
1131 ofconn->schedulers[i] = pinsched_create(rate, burst);
1132 }
1133 }
1134 if (ofconn->pktbuf) {
1135 pktbuf_destroy(ofconn->pktbuf);
1136 ofconn->pktbuf = pktbuf_create();
1137 }
1138 ofconn->miss_send_len = (ofconn->type == OFCONN_PRIMARY
1139 ? OFP_DEFAULT_MISS_SEND_LEN
1140 : 0);
1141 ofconn->controller_id = 0;
1142
1143 rconn_packet_counter_destroy(ofconn->reply_counter);
1144 ofconn->reply_counter = rconn_packet_counter_create();
1145
1146 if (ofconn->enable_async_msgs) {
1147 uint32_t *master = ofconn->master_async_config;
1148 uint32_t *slave = ofconn->slave_async_config;
1149
1150 /* "master" and "other" roles get all asynchronous messages by default,
1151 * except that the controller needs to enable nonstandard "packet-in"
1152 * reasons itself. */
1153 master[OAM_PACKET_IN] = (1u << OFPR_NO_MATCH) | (1u << OFPR_ACTION);
1154 master[OAM_PORT_STATUS] = ((1u << OFPPR_ADD)
1155 | (1u << OFPPR_DELETE)
1156 | (1u << OFPPR_MODIFY));
1157 master[OAM_FLOW_REMOVED] = ((1u << OFPRR_IDLE_TIMEOUT)
1158 | (1u << OFPRR_HARD_TIMEOUT)
1159 | (1u << OFPRR_DELETE));
1160
1161 /* "slave" role gets port status updates by default. */
1162 slave[OAM_PACKET_IN] = 0;
1163 slave[OAM_PORT_STATUS] = ((1u << OFPPR_ADD)
1164 | (1u << OFPPR_DELETE)
1165 | (1u << OFPPR_MODIFY));
1166 slave[OAM_FLOW_REMOVED] = 0;
1167 } else {
1168 memset(ofconn->master_async_config, 0,
1169 sizeof ofconn->master_async_config);
1170 memset(ofconn->slave_async_config, 0,
1171 sizeof ofconn->slave_async_config);
1172 }
1173
1174 HMAP_FOR_EACH_SAFE (monitor, next_monitor, ofconn_node,
1175 &ofconn->monitors) {
1176 ofmonitor_destroy(monitor);
1177 }
1178 rconn_packet_counter_destroy(ofconn->monitor_counter);
1179 ofconn->monitor_counter = rconn_packet_counter_create();
1180 ofpbuf_list_delete(&ofconn->updates); /* ...but it should be empty. */
1181}
1182
1183static void
1184ofconn_destroy(struct ofconn *ofconn)
1185{
1186 ofconn_flush(ofconn);
1187
1188 if (ofconn->type == OFCONN_PRIMARY) {
1189 hmap_remove(&ofconn->connmgr->controllers, &ofconn->hmap_node);
1190 }
1191
1192 hmap_destroy(&ofconn->monitors);
1193 list_remove(&ofconn->node);
1194 rconn_destroy(ofconn->rconn);
1195 rconn_packet_counter_destroy(ofconn->packet_in_counter);
1196 rconn_packet_counter_destroy(ofconn->reply_counter);
1197 pktbuf_destroy(ofconn->pktbuf);
1198 rconn_packet_counter_destroy(ofconn->monitor_counter);
1199 free(ofconn);
1200}
1201
1202/* Reconfigures 'ofconn' to match 'c'. 'ofconn' and 'c' must have the same
1203 * target. */
1204static void
1205ofconn_reconfigure(struct ofconn *ofconn, const struct ofproto_controller *c)
1206{
1207 int probe_interval;
1208
1209 ofconn->band = c->band;
1210 ofconn->enable_async_msgs = c->enable_async_msgs;
1211
1212 rconn_set_max_backoff(ofconn->rconn, c->max_backoff);
1213
1214 probe_interval = c->probe_interval ? MAX(c->probe_interval, 5) : 0;
1215 rconn_set_probe_interval(ofconn->rconn, probe_interval);
1216
1217 ofconn_set_rate_limit(ofconn, c->rate_limit, c->burst_limit);
1218
1219 /* If dscp value changed reconnect. */
1220 if (c->dscp != rconn_get_dscp(ofconn->rconn)) {
1221 rconn_set_dscp(ofconn->rconn, c->dscp);
1222 rconn_reconnect(ofconn->rconn);
1223 }
1224}
1225
1226/* Returns true if it makes sense for 'ofconn' to receive and process OpenFlow
1227 * messages. */
1228static bool
1229ofconn_may_recv(const struct ofconn *ofconn)
1230{
1231 int count = ofconn->reply_counter->n_packets;
1232 return (!ofconn->blocked || ofconn->retry) && count < OFCONN_REPLY_MAX;
1233}
1234
1235static void
1236ofconn_run(struct ofconn *ofconn,
1237 bool (*handle_openflow)(struct ofconn *, struct ofpbuf *ofp_msg))
1238{
1239 struct connmgr *mgr = ofconn->connmgr;
1240 size_t i;
1241
1242 for (i = 0; i < N_SCHEDULERS; i++) {
1243 pinsched_run(ofconn->schedulers[i], do_send_packet_in, ofconn);
1244 }
1245
1246 rconn_run(ofconn->rconn);
1247
1248 if (handle_openflow) {
1249 /* Limit the number of iterations to avoid starving other tasks. */
1250 for (i = 0; i < 50 && ofconn_may_recv(ofconn); i++) {
1251 struct ofpbuf *of_msg;
1252
1253 of_msg = (ofconn->blocked
1254 ? ofconn->blocked
1255 : rconn_recv(ofconn->rconn));
1256 if (!of_msg) {
1257 break;
1258 }
1259 if (mgr->fail_open) {
1260 fail_open_maybe_recover(mgr->fail_open);
1261 }
1262
1263 if (handle_openflow(ofconn, of_msg)) {
1264 ofpbuf_delete(of_msg);
1265 ofconn->blocked = NULL;
1266 } else {
1267 ofconn->blocked = of_msg;
1268 ofconn->retry = false;
1269 }
1270 }
1271 }
1272
1273 if (!rconn_is_alive(ofconn->rconn)) {
1274 ofconn_destroy(ofconn);
1275 } else if (!rconn_is_connected(ofconn->rconn)) {
1276 ofconn_flush(ofconn);
1277 }
1278}
1279
1280static void
1281ofconn_wait(struct ofconn *ofconn, bool handling_openflow)
1282{
1283 int i;
1284
1285 for (i = 0; i < N_SCHEDULERS; i++) {
1286 pinsched_wait(ofconn->schedulers[i]);
1287 }
1288 rconn_run_wait(ofconn->rconn);
1289 if (handling_openflow && ofconn_may_recv(ofconn)) {
1290 rconn_recv_wait(ofconn->rconn);
1291 }
1292}
1293
1294/* Returns true if 'ofconn' should receive asynchronous messages of the given
1295 * OAM_* 'type' and 'reason', which should be a OFPR_* value for OAM_PACKET_IN,
1296 * a OFPPR_* value for OAM_PORT_STATUS, or an OFPRR_* value for
1297 * OAM_FLOW_REMOVED. Returns false if the message should not be sent on
1298 * 'ofconn'. */
1299static bool
1300ofconn_receives_async_msg(const struct ofconn *ofconn,
1301 enum ofconn_async_msg_type type,
1302 unsigned int reason)
1303{
1304 const uint32_t *async_config;
1305
1306 ovs_assert(reason < 32);
1307 ovs_assert((unsigned int) type < OAM_N_TYPES);
1308
1309 if (ofconn_get_protocol(ofconn) == OFPUTIL_P_NONE
1310 || !rconn_is_connected(ofconn->rconn)) {
1311 return false;
1312 }
1313
1314 /* Keep the following code in sync with the documentation in the
1315 * "Asynchronous Messages" section in DESIGN. */
1316
1317 if (ofconn->type == OFCONN_SERVICE && !ofconn->miss_send_len) {
1318 /* Service connections don't get asynchronous messages unless they have
1319 * explicitly asked for them by setting a nonzero miss send length. */
1320 return false;
1321 }
1322
1323 async_config = (ofconn->role == OFPCR12_ROLE_SLAVE
1324 ? ofconn->slave_async_config
1325 : ofconn->master_async_config);
1326 if (!(async_config[type] & (1u << reason))) {
1327 return false;
1328 }
1329
1330 return true;
1331}
1332
1333/* Returns a human-readable name for an OpenFlow connection between 'mgr' and
1334 * 'target', suitable for use in log messages for identifying the connection.
1335 *
1336 * The name is dynamically allocated. The caller should free it (with free())
1337 * when it is no longer needed. */
1338static char *
1339ofconn_make_name(const struct connmgr *mgr, const char *target)
1340{
1341 return xasprintf("%s<->%s", mgr->name, target);
1342}
1343
1344static void
1345ofconn_set_rate_limit(struct ofconn *ofconn, int rate, int burst)
1346{
1347 int i;
1348
1349 for (i = 0; i < N_SCHEDULERS; i++) {
1350 struct pinsched **s = &ofconn->schedulers[i];
1351
1352 if (rate > 0) {
1353 if (!*s) {
1354 *s = pinsched_create(rate, burst);
1355 } else {
1356 pinsched_set_limits(*s, rate, burst);
1357 }
1358 } else {
1359 pinsched_destroy(*s);
1360 *s = NULL;
1361 }
1362 }
1363}
1364
1365static void
1366ofconn_send(const struct ofconn *ofconn, struct ofpbuf *msg,
1367 struct rconn_packet_counter *counter)
1368{
1369 ofpmsg_update_length(msg);
1370 rconn_send(ofconn->rconn, msg, counter);
1371}
1372
1373/* Sending asynchronous messages. */
1374
1375static void schedule_packet_in(struct ofconn *, struct ofputil_packet_in);
1376
1377/* Sends an OFPT_PORT_STATUS message with 'opp' and 'reason' to appropriate
1378 * controllers managed by 'mgr'. */
1379void
1380connmgr_send_port_status(struct connmgr *mgr,
1381 const struct ofputil_phy_port *pp, uint8_t reason)
1382{
1383 /* XXX Should limit the number of queued port status change messages. */
1384 struct ofputil_port_status ps;
1385 struct ofconn *ofconn;
1386
1387 ps.reason = reason;
1388 ps.desc = *pp;
1389 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1390 if (ofconn_receives_async_msg(ofconn, OAM_PORT_STATUS, reason)) {
1391 struct ofpbuf *msg;
1392
1393 msg = ofputil_encode_port_status(&ps, ofconn_get_protocol(ofconn));
1394 ofconn_send(ofconn, msg, NULL);
1395 }
1396 }
1397}
1398
1399/* Sends an OFPT_FLOW_REMOVED or NXT_FLOW_REMOVED message based on 'fr' to
1400 * appropriate controllers managed by 'mgr'. */
1401void
1402connmgr_send_flow_removed(struct connmgr *mgr,
1403 const struct ofputil_flow_removed *fr)
1404{
1405 struct ofconn *ofconn;
1406
1407 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1408 if (ofconn_receives_async_msg(ofconn, OAM_FLOW_REMOVED, fr->reason)) {
1409 struct ofpbuf *msg;
1410
1411 /* Account flow expirations as replies to OpenFlow requests. That
1412 * works because preventing OpenFlow requests from being processed
1413 * also prevents new flows from being added (and expiring). (It
1414 * also prevents processing OpenFlow requests that would not add
1415 * new flows, so it is imperfect.) */
1416 msg = ofputil_encode_flow_removed(fr, ofconn_get_protocol(ofconn));
1417 ofconn_send_reply(ofconn, msg);
1418 }
1419 }
1420}
1421
1422/* Given 'pin', sends an OFPT_PACKET_IN message to each OpenFlow controller as
1423 * necessary according to their individual configurations.
1424 *
1425 * The caller doesn't need to fill in pin->buffer_id or pin->total_len. */
1426void
1427connmgr_send_packet_in(struct connmgr *mgr,
1428 const struct ofputil_packet_in *pin)
1429{
1430 struct ofconn *ofconn;
1431
1432 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1433 if (ofconn_receives_async_msg(ofconn, OAM_PACKET_IN, pin->reason)
1434 && ofconn->controller_id == pin->controller_id) {
1435 schedule_packet_in(ofconn, *pin);
1436 }
1437 }
1438}
1439
1440/* pinsched callback for sending 'ofp_packet_in' on 'ofconn'. */
1441static void
1442do_send_packet_in(struct ofpbuf *ofp_packet_in, void *ofconn_)
1443{
1444 struct ofconn *ofconn = ofconn_;
1445
1446 rconn_send_with_limit(ofconn->rconn, ofp_packet_in,
1447 ofconn->packet_in_counter, 100);
1448}
1449
1450/* Takes 'pin', composes an OpenFlow packet-in message from it, and passes it
1451 * to 'ofconn''s packet scheduler for sending. */
1452static void
1453schedule_packet_in(struct ofconn *ofconn, struct ofputil_packet_in pin)
1454{
1455 struct connmgr *mgr = ofconn->connmgr;
1456
1457 pin.total_len = pin.packet_len;
1458
1459 /* Get OpenFlow buffer_id. */
1460 if (pin.reason == OFPR_ACTION) {
1461 pin.buffer_id = UINT32_MAX;
1462 } else if (mgr->fail_open && fail_open_is_active(mgr->fail_open)) {
1463 pin.buffer_id = pktbuf_get_null();
1464 } else if (!ofconn->pktbuf) {
1465 pin.buffer_id = UINT32_MAX;
1466 } else {
1467 pin.buffer_id = pktbuf_save(ofconn->pktbuf, pin.packet, pin.packet_len,
1468 pin.fmd.in_port);
1469 }
1470
1471 /* Figure out how much of the packet to send. */
1472 if (pin.reason == OFPR_NO_MATCH) {
1473 pin.send_len = pin.packet_len;
1474 } else {
1475 /* Caller should have initialized 'send_len' to 'max_len' specified in
1476 * output action. */
1477 }
1478 if (pin.buffer_id != UINT32_MAX) {
1479 pin.send_len = MIN(pin.send_len, ofconn->miss_send_len);
1480 }
1481
1482 /* Make OFPT_PACKET_IN and hand over to packet scheduler. It might
1483 * immediately call into do_send_packet_in() or it might buffer it for a
1484 * while (until a later call to pinsched_run()). */
1485 pinsched_send(ofconn->schedulers[pin.reason == OFPR_NO_MATCH ? 0 : 1],
1486 pin.fmd.in_port,
1487 ofputil_encode_packet_in(&pin, ofconn_get_protocol(ofconn),
1488 ofconn->packet_in_format),
1489 do_send_packet_in, ofconn);
1490}
1491
1492/* Fail-open settings. */
1493
1494/* Returns the failure handling mode (OFPROTO_FAIL_SECURE or
1495 * OFPROTO_FAIL_STANDALONE) for 'mgr'. */
1496enum ofproto_fail_mode
1497connmgr_get_fail_mode(const struct connmgr *mgr)
1498{
1499 return mgr->fail_mode;
1500}
1501
1502/* Sets the failure handling mode for 'mgr' to 'fail_mode' (either
1503 * OFPROTO_FAIL_SECURE or OFPROTO_FAIL_STANDALONE). */
1504void
1505connmgr_set_fail_mode(struct connmgr *mgr, enum ofproto_fail_mode fail_mode)
1506{
1507 if (mgr->fail_mode != fail_mode) {
1508 mgr->fail_mode = fail_mode;
1509 update_fail_open(mgr);
1510 if (!connmgr_has_controllers(mgr)) {
1511 ofproto_flush_flows(mgr->ofproto);
1512 }
1513 }
1514}
1515
1516/* Fail-open implementation. */
1517
1518/* Returns the longest probe interval among the primary controllers configured
1519 * on 'mgr'. Returns 0 if there are no primary controllers. */
1520int
1521connmgr_get_max_probe_interval(const struct connmgr *mgr)
1522{
1523 const struct ofconn *ofconn;
1524 int max_probe_interval;
1525
1526 max_probe_interval = 0;
1527 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
1528 int probe_interval = rconn_get_probe_interval(ofconn->rconn);
1529 max_probe_interval = MAX(max_probe_interval, probe_interval);
1530 }
1531 return max_probe_interval;
1532}
1533
1534/* Returns the number of seconds for which all of 'mgr's primary controllers
1535 * have been disconnected. Returns 0 if 'mgr' has no primary controllers. */
1536int
1537connmgr_failure_duration(const struct connmgr *mgr)
1538{
1539 const struct ofconn *ofconn;
1540 int min_failure_duration;
1541
1542 if (!connmgr_has_controllers(mgr)) {
1543 return 0;
1544 }
1545
1546 min_failure_duration = INT_MAX;
1547 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
1548 int failure_duration = rconn_failure_duration(ofconn->rconn);
1549 min_failure_duration = MIN(min_failure_duration, failure_duration);
1550 }
1551 return min_failure_duration;
1552}
1553
1554/* Returns true if at least one primary controller is connected (regardless of
1555 * whether those controllers are believed to have authenticated and accepted
1556 * this switch), false if none of them are connected. */
1557bool
1558connmgr_is_any_controller_connected(const struct connmgr *mgr)
1559{
1560 const struct ofconn *ofconn;
1561
1562 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
1563 if (rconn_is_connected(ofconn->rconn)) {
1564 return true;
1565 }
1566 }
1567 return false;
1568}
1569
1570/* Returns true if at least one primary controller is believed to have
1571 * authenticated and accepted this switch, false otherwise. */
1572bool
1573connmgr_is_any_controller_admitted(const struct connmgr *mgr)
1574{
1575 const struct ofconn *ofconn;
1576
1577 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
1578 if (rconn_is_admitted(ofconn->rconn)) {
1579 return true;
1580 }
1581 }
1582 return false;
1583}
1584
1585/* In-band configuration. */
1586
1587static bool any_extras_changed(const struct connmgr *,
1588 const struct sockaddr_in *extras, size_t n);
1589
1590/* Sets the 'n' TCP port addresses in 'extras' as ones to which 'mgr''s
1591 * in-band control should guarantee access, in the same way that in-band
1592 * control guarantees access to OpenFlow controllers. */
1593void
1594connmgr_set_extra_in_band_remotes(struct connmgr *mgr,
1595 const struct sockaddr_in *extras, size_t n)
1596{
1597 if (!any_extras_changed(mgr, extras, n)) {
1598 return;
1599 }
1600
1601 free(mgr->extra_in_band_remotes);
1602 mgr->n_extra_remotes = n;
1603 mgr->extra_in_band_remotes = xmemdup(extras, n * sizeof *extras);
1604
1605 update_in_band_remotes(mgr);
1606}
1607
1608/* Sets the OpenFlow queue used by flows set up by in-band control on
1609 * 'mgr' to 'queue_id'. If 'queue_id' is negative, then in-band control
1610 * flows will use the default queue. */
1611void
1612connmgr_set_in_band_queue(struct connmgr *mgr, int queue_id)
1613{
1614 if (queue_id != mgr->in_band_queue) {
1615 mgr->in_band_queue = queue_id;
1616 update_in_band_remotes(mgr);
1617 }
1618}
1619
1620static bool
1621any_extras_changed(const struct connmgr *mgr,
1622 const struct sockaddr_in *extras, size_t n)
1623{
1624 size_t i;
1625
1626 if (n != mgr->n_extra_remotes) {
1627 return true;
1628 }
1629
1630 for (i = 0; i < n; i++) {
1631 const struct sockaddr_in *old = &mgr->extra_in_band_remotes[i];
1632 const struct sockaddr_in *new = &extras[i];
1633
1634 if (old->sin_addr.s_addr != new->sin_addr.s_addr ||
1635 old->sin_port != new->sin_port) {
1636 return true;
1637 }
1638 }
1639
1640 return false;
1641}
1642
1643/* In-band implementation. */
1644
1645bool
1646connmgr_must_output_local(struct connmgr *mgr, const struct flow *flow,
1647 uint32_t local_odp_port,
1648 const struct nlattr *odp_actions,
1649 size_t actions_len)
1650{
1651 return !mgr->in_band || in_band_rule_check(flow, local_odp_port,
1652 odp_actions, actions_len);
1653}
1654
1655/* Fail-open and in-band implementation. */
1656
1657/* Called by 'ofproto' after all flows have been flushed, to allow fail-open
1658 * and standalone mode to re-create their flows.
1659 *
1660 * In-band control has more sophisticated code that manages flows itself. */
1661void
1662connmgr_flushed(struct connmgr *mgr)
1663{
1664 if (mgr->fail_open) {
1665 fail_open_flushed(mgr->fail_open);
1666 }
1667
1668 /* If there are no controllers and we're in standalone mode, set up a flow
1669 * that matches every packet and directs them to OFPP_NORMAL (which goes to
1670 * us). Otherwise, the switch is in secure mode and we won't pass any
1671 * traffic until a controller has been defined and it tells us to do so. */
1672 if (!connmgr_has_controllers(mgr)
1673 && mgr->fail_mode == OFPROTO_FAIL_STANDALONE) {
1674 struct ofpbuf ofpacts;
1675 struct match match;
1676
1677 ofpbuf_init(&ofpacts, OFPACT_OUTPUT_SIZE);
1678 ofpact_put_OUTPUT(&ofpacts)->port = OFPP_NORMAL;
1679 ofpact_pad(&ofpacts);
1680
1681 match_init_catchall(&match);
1682 ofproto_add_flow(mgr->ofproto, &match, 0, ofpacts.data, ofpacts.size);
1683
1684 ofpbuf_uninit(&ofpacts);
1685 }
1686}
1687
1688/* Creates a new ofservice for 'target' in 'mgr'. Returns 0 if successful,
1689 * otherwise a positive errno value.
1690 *
1691 * ofservice_reconfigure() must be called to fully configure the new
1692 * ofservice. */
1693static int
1694ofservice_create(struct connmgr *mgr, const char *target,
1695 uint32_t allowed_versions, uint8_t dscp)
1696{
1697 struct ofservice *ofservice;
1698 struct pvconn *pvconn;
1699 int error;
1700
1701 error = pvconn_open(target, allowed_versions, dscp, &pvconn);
1702 if (error) {
1703 return error;
1704 }
1705
1706 ofservice = xzalloc(sizeof *ofservice);
1707 hmap_insert(&mgr->services, &ofservice->node, hash_string(target, 0));
1708 ofservice->pvconn = pvconn;
1709 ofservice->allowed_versions = allowed_versions;
1710
1711 return 0;
1712}
1713
1714static void
1715ofservice_destroy(struct connmgr *mgr, struct ofservice *ofservice)
1716{
1717 hmap_remove(&mgr->services, &ofservice->node);
1718 pvconn_close(ofservice->pvconn);
1719 free(ofservice);
1720}
1721
1722static void
1723ofservice_reconfigure(struct ofservice *ofservice,
1724 const struct ofproto_controller *c)
1725{
1726 ofservice->probe_interval = c->probe_interval;
1727 ofservice->rate_limit = c->rate_limit;
1728 ofservice->burst_limit = c->burst_limit;
1729 ofservice->enable_async_msgs = c->enable_async_msgs;
1730 ofservice->dscp = c->dscp;
1731}
1732
1733/* Finds and returns the ofservice within 'mgr' that has the given
1734 * 'target', or a null pointer if none exists. */
1735static struct ofservice *
1736ofservice_lookup(struct connmgr *mgr, const char *target)
1737{
1738 struct ofservice *ofservice;
1739
1740 HMAP_FOR_EACH_WITH_HASH (ofservice, node, hash_string(target, 0),
1741 &mgr->services) {
1742 if (!strcmp(pvconn_get_name(ofservice->pvconn), target)) {
1743 return ofservice;
1744 }
1745 }
1746 return NULL;
1747}
1748
1749/* Flow monitors (NXST_FLOW_MONITOR). */
1750
1751/* A counter incremented when something significant happens to an OpenFlow
1752 * rule.
1753 *
1754 * - When a rule is added, its 'add_seqno' and 'modify_seqno' are set to
1755 * the current value (which is then incremented).
1756 *
1757 * - When a rule is modified, its 'modify_seqno' is set to the current
1758 * value (which is then incremented).
1759 *
1760 * Thus, by comparing an old value of monitor_seqno against a rule's
1761 * 'add_seqno', one can tell whether the rule was added before or after the old
1762 * value was read, and similarly for 'modify_seqno'.
1763 *
1764 * 32 bits should normally be sufficient (and would be nice, to save space in
1765 * each rule) but then we'd have to have some special cases for wraparound.
1766 *
1767 * We initialize monitor_seqno to 1 to allow 0 to be used as an invalid
1768 * value. */
1769static uint64_t monitor_seqno = 1;
1770
1771COVERAGE_DEFINE(ofmonitor_pause);
1772COVERAGE_DEFINE(ofmonitor_resume);
1773
1774enum ofperr
1775ofmonitor_create(const struct ofputil_flow_monitor_request *request,
1776 struct ofconn *ofconn, struct ofmonitor **monitorp)
1777{
1778 struct ofmonitor *m;
1779
1780 *monitorp = NULL;
1781
1782 m = ofmonitor_lookup(ofconn, request->id);
1783 if (m) {
1784 return OFPERR_NXBRC_FM_DUPLICATE_ID;
1785 }
1786
1787 m = xmalloc(sizeof *m);
1788 m->ofconn = ofconn;
1789 hmap_insert(&ofconn->monitors, &m->ofconn_node, hash_int(request->id, 0));
1790 m->id = request->id;
1791 m->flags = request->flags;
1792 m->out_port = request->out_port;
1793 m->table_id = request->table_id;
1794 minimatch_init(&m->match, &request->match);
1795
1796 *monitorp = m;
1797 return 0;
1798}
1799
1800struct ofmonitor *
1801ofmonitor_lookup(struct ofconn *ofconn, uint32_t id)
1802{
1803 struct ofmonitor *m;
1804
1805 HMAP_FOR_EACH_IN_BUCKET (m, ofconn_node, hash_int(id, 0),
1806 &ofconn->monitors) {
1807 if (m->id == id) {
1808 return m;
1809 }
1810 }
1811 return NULL;
1812}
1813
1814void
1815ofmonitor_destroy(struct ofmonitor *m)
1816{
1817 if (m) {
1818 minimatch_destroy(&m->match);
1819 hmap_remove(&m->ofconn->monitors, &m->ofconn_node);
1820 free(m);
1821 }
1822}
1823
1824void
1825ofmonitor_report(struct connmgr *mgr, struct rule *rule,
1826 enum nx_flow_update_event event,
1827 enum ofp_flow_removed_reason reason,
1828 const struct ofconn *abbrev_ofconn, ovs_be32 abbrev_xid)
1829{
1830 enum nx_flow_monitor_flags update;
1831 struct ofconn *ofconn;
1832
1833 switch (event) {
1834 case NXFME_ADDED:
1835 update = NXFMF_ADD;
1836 rule->add_seqno = rule->modify_seqno = monitor_seqno++;
1837 break;
1838
1839 case NXFME_DELETED:
1840 update = NXFMF_DELETE;
1841 break;
1842
1843 case NXFME_MODIFIED:
1844 update = NXFMF_MODIFY;
1845 rule->modify_seqno = monitor_seqno++;
1846 break;
1847
1848 default:
1849 case NXFME_ABBREV:
1850 NOT_REACHED();
1851 }
1852
1853 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1854 enum nx_flow_monitor_flags flags = 0;
1855 struct ofmonitor *m;
1856
1857 if (ofconn->monitor_paused) {
1858 /* Only send NXFME_DELETED notifications for flows that were added
1859 * before we paused. */
1860 if (event != NXFME_DELETED
1861 || rule->add_seqno > ofconn->monitor_paused) {
1862 continue;
1863 }
1864 }
1865
1866 HMAP_FOR_EACH (m, ofconn_node, &ofconn->monitors) {
1867 if (m->flags & update
1868 && (m->table_id == 0xff || m->table_id == rule->table_id)
1869 && ofoperation_has_out_port(rule->pending, m->out_port)
1870 && cls_rule_is_loose_match(&rule->cr, &m->match)) {
1871 flags |= m->flags;
1872 }
1873 }
1874
1875 if (flags) {
1876 if (list_is_empty(&ofconn->updates)) {
1877 ofputil_start_flow_update(&ofconn->updates);
1878 ofconn->sent_abbrev_update = false;
1879 }
1880
1881 if (ofconn != abbrev_ofconn || ofconn->monitor_paused) {
1882 struct ofputil_flow_update fu;
1883 struct match match;
1884
1885 fu.event = event;
1886 fu.reason = event == NXFME_DELETED ? reason : 0;
1887 fu.idle_timeout = rule->idle_timeout;
1888 fu.hard_timeout = rule->hard_timeout;
1889 fu.table_id = rule->table_id;
1890 fu.cookie = rule->flow_cookie;
1891 minimatch_expand(&rule->cr.match, &match);
1892 fu.match = &match;
1893 fu.priority = rule->cr.priority;
1894 if (flags & NXFMF_ACTIONS) {
1895 fu.ofpacts = rule->ofpacts;
1896 fu.ofpacts_len = rule->ofpacts_len;
1897 } else {
1898 fu.ofpacts = NULL;
1899 fu.ofpacts_len = 0;
1900 }
1901 ofputil_append_flow_update(&fu, &ofconn->updates);
1902 } else if (!ofconn->sent_abbrev_update) {
1903 struct ofputil_flow_update fu;
1904
1905 fu.event = NXFME_ABBREV;
1906 fu.xid = abbrev_xid;
1907 ofputil_append_flow_update(&fu, &ofconn->updates);
1908
1909 ofconn->sent_abbrev_update = true;
1910 }
1911 }
1912 }
1913}
1914
1915void
1916ofmonitor_flush(struct connmgr *mgr)
1917{
1918 struct ofconn *ofconn;
1919
1920 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1921 struct ofpbuf *msg, *next;
1922
1923 LIST_FOR_EACH_SAFE (msg, next, list_node, &ofconn->updates) {
1924 list_remove(&msg->list_node);
1925 ofconn_send(ofconn, msg, ofconn->monitor_counter);
1926 if (!ofconn->monitor_paused
1927 && ofconn->monitor_counter->n_bytes > 128 * 1024) {
1928 struct ofpbuf *pause;
1929
1930 COVERAGE_INC(ofmonitor_pause);
1931 ofconn->monitor_paused = monitor_seqno++;
1932 pause = ofpraw_alloc_xid(OFPRAW_NXT_FLOW_MONITOR_PAUSED,
1933 OFP10_VERSION, htonl(0), 0);
1934 ofconn_send(ofconn, pause, ofconn->monitor_counter);
1935 }
1936 }
1937 }
1938}
1939
1940static void
1941ofmonitor_resume(struct ofconn *ofconn)
1942{
1943 struct ofpbuf *resumed;
1944 struct ofmonitor *m;
1945 struct list rules;
1946 struct list msgs;
1947
1948 list_init(&rules);
1949 HMAP_FOR_EACH (m, ofconn_node, &ofconn->monitors) {
1950 ofmonitor_collect_resume_rules(m, ofconn->monitor_paused, &rules);
1951 }
1952
1953 list_init(&msgs);
1954 ofmonitor_compose_refresh_updates(&rules, &msgs);
1955
1956 resumed = ofpraw_alloc_xid(OFPRAW_NXT_FLOW_MONITOR_RESUMED, OFP10_VERSION,
1957 htonl(0), 0);
1958 list_push_back(&msgs, &resumed->list_node);
1959 ofconn_send_replies(ofconn, &msgs);
1960
1961 ofconn->monitor_paused = 0;
1962}
1963
1964static void
1965ofmonitor_run(struct connmgr *mgr)
1966{
1967 struct ofconn *ofconn;
1968
1969 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1970 if (ofconn->monitor_paused && !ofconn->monitor_counter->n_packets) {
1971 COVERAGE_INC(ofmonitor_resume);
1972 ofmonitor_resume(ofconn);
1973 }
1974 }
1975}
1976
1977static void
1978ofmonitor_wait(struct connmgr *mgr)
1979{
1980 struct ofconn *ofconn;
1981
1982 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1983 if (ofconn->monitor_paused && !ofconn->monitor_counter->n_packets) {
1984 poll_immediate_wake();
1985 }
1986 }
1987}