2 * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
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.
25 #include "fail-open.h"
28 #include "ofp-actions.h"
32 #include "ofproto-provider.h"
34 #include "poll-loop.h"
44 VLOG_DEFINE_THIS_MODULE(connmgr);
45 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
47 /* An OpenFlow connection. */
49 /* Configuration that persists from one connection to the next. */
51 struct list node; /* In struct connmgr's "all_conns" list. */
52 struct hmap_node hmap_node; /* In struct connmgr's "controllers" map. */
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? */
60 /* State that should be cleared from one connection to the next. */
63 enum nx_role role; /* Role. */
64 enum ofputil_protocol protocol; /* Current protocol variant. */
65 enum nx_packet_in_format packet_in_format; /* OFPT_PACKET_IN format. */
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. */
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. */
80 /* Number of OpenFlow messages queued on 'rconn' as replies to OpenFlow
81 * requests, and the maximum number before we stop reading OpenFlow
83 #define OFCONN_REPLY_MAX 100
84 struct rconn_packet_counter *reply_counter;
86 /* Asynchronous message configuration in each possible roles.
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 */
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;
101 static struct ofconn *ofconn_create(struct connmgr *, struct rconn *,
102 enum ofconn_type, bool enable_async_msgs);
103 static void ofconn_destroy(struct ofconn *);
104 static void ofconn_flush(struct ofconn *);
106 static void ofconn_reconfigure(struct ofconn *,
107 const struct ofproto_controller *);
109 static void ofconn_run(struct ofconn *,
110 bool (*handle_openflow)(struct ofconn *,
111 struct ofpbuf *ofp_msg));
112 static void ofconn_wait(struct ofconn *, bool handling_openflow);
114 static const char *ofconn_get_target(const struct ofconn *);
115 static char *ofconn_make_name(const struct connmgr *, const char *target);
117 static void ofconn_set_rate_limit(struct ofconn *, int rate, int burst);
119 static void ofconn_send(const struct ofconn *, struct ofpbuf *,
120 struct rconn_packet_counter *);
122 static void do_send_packet_in(struct ofpbuf *, void *ofconn_);
124 /* A listener for incoming OpenFlow "service" connections. */
126 struct hmap_node node; /* In struct connmgr's "services" hmap. */
127 struct pvconn *pvconn; /* OpenFlow connection listener. */
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. */
140 static void ofservice_reconfigure(struct ofservice *,
141 const struct ofproto_controller *);
142 static int ofservice_create(struct connmgr *mgr, const char *target,
143 uint32_t allowed_versions, uint8_t dscp);
144 static void ofservice_destroy(struct connmgr *, struct ofservice *);
145 static struct ofservice *ofservice_lookup(struct connmgr *,
148 /* Connection manager for an OpenFlow switch. */
150 struct ofproto *ofproto;
152 char *local_port_name;
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;
161 /* OpenFlow listeners. */
162 struct hmap services; /* Contains "struct ofservice"s. */
163 struct pvconn **snoops;
167 struct fail_open *fail_open;
168 enum ofproto_fail_mode fail_mode;
170 /* In-band control. */
171 struct in_band *in_band;
172 struct sockaddr_in *extra_in_band_remotes;
173 size_t n_extra_remotes;
177 static void update_in_band_remotes(struct connmgr *);
178 static void add_snooper(struct connmgr *, struct vconn *);
179 static void ofmonitor_run(struct connmgr *);
180 static void ofmonitor_wait(struct connmgr *);
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
187 connmgr_create(struct ofproto *ofproto,
188 const char *name, const char *local_port_name)
192 mgr = xmalloc(sizeof *mgr);
193 mgr->ofproto = ofproto;
194 mgr->name = xstrdup(name);
195 mgr->local_port_name = xstrdup(local_port_name);
197 hmap_init(&mgr->controllers);
198 list_init(&mgr->all_conns);
199 mgr->master_election_id = 0;
200 mgr->master_election_id_defined = false;
202 hmap_init(&mgr->services);
206 mgr->fail_open = NULL;
207 mgr->fail_mode = OFPROTO_FAIL_SECURE;
210 mgr->extra_in_band_remotes = NULL;
211 mgr->n_extra_remotes = 0;
212 mgr->in_band_queue = -1;
217 /* Frees 'mgr' and all of its resources. */
219 connmgr_destroy(struct connmgr *mgr)
221 struct ofservice *ofservice, *next_ofservice;
222 struct ofconn *ofconn, *next_ofconn;
229 LIST_FOR_EACH_SAFE (ofconn, next_ofconn, node, &mgr->all_conns) {
230 ofconn_destroy(ofconn);
232 hmap_destroy(&mgr->controllers);
234 HMAP_FOR_EACH_SAFE (ofservice, next_ofservice, node, &mgr->services) {
235 ofservice_destroy(mgr, ofservice);
237 hmap_destroy(&mgr->services);
239 for (i = 0; i < mgr->n_snoops; i++) {
240 pvconn_close(mgr->snoops[i]);
244 fail_open_destroy(mgr->fail_open);
245 mgr->fail_open = NULL;
247 in_band_destroy(mgr->in_band);
249 free(mgr->extra_in_band_remotes);
251 free(mgr->local_port_name);
256 /* Does all of the periodic maintenance required by 'mgr'.
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
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. */
271 connmgr_run(struct connmgr *mgr,
272 bool (*handle_openflow)(struct ofconn *, struct ofpbuf *ofp_msg))
274 struct ofconn *ofconn, *next_ofconn;
275 struct ofservice *ofservice;
278 if (handle_openflow && mgr->in_band) {
279 if (!in_band_run(mgr->in_band)) {
280 in_band_destroy(mgr->in_band);
285 LIST_FOR_EACH_SAFE (ofconn, next_ofconn, node, &mgr->all_conns) {
286 ofconn_run(ofconn, handle_openflow);
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);
296 HMAP_FOR_EACH (ofservice, node, &mgr->services) {
300 retval = pvconn_accept(ofservice->pvconn, &vconn);
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);
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));
321 for (i = 0; i < mgr->n_snoops; i++) {
325 retval = pvconn_accept(mgr->snoops[i], &vconn);
327 add_snooper(mgr, vconn);
328 } else if (retval != EAGAIN) {
329 VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval));
334 /* Causes the poll loop to wake up when connmgr_run() needs to run.
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. */
340 connmgr_wait(struct connmgr *mgr, bool handling_openflow)
342 struct ofservice *ofservice;
343 struct ofconn *ofconn;
346 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
347 ofconn_wait(ofconn, handling_openflow);
350 if (handling_openflow && mgr->in_band) {
351 in_band_wait(mgr->in_band);
353 if (handling_openflow && mgr->fail_open) {
354 fail_open_wait(mgr->fail_open);
356 HMAP_FOR_EACH (ofservice, node, &mgr->services) {
357 pvconn_wait(ofservice->pvconn);
359 for (i = 0; i < mgr->n_snoops; i++) {
360 pvconn_wait(mgr->snoops[i]);
364 /* Adds some memory usage statistics for 'mgr' into 'usage', for use with
365 * memory_report(). */
367 connmgr_get_memory_usage(const struct connmgr *mgr, struct simap *usage)
369 const struct ofconn *ofconn;
370 unsigned int packets = 0;
371 unsigned int ofconns = 0;
373 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
378 packets += rconn_count_txqlen(ofconn->rconn);
379 for (i = 0; i < N_SCHEDULERS; i++) {
380 packets += pinsched_count_txqlen(ofconn->schedulers[i]);
382 packets += pktbuf_count_packets(ofconn->pktbuf);
384 simap_increase(usage, "ofconns", ofconns);
385 simap_increase(usage, "packets", packets);
388 /* Returns the ofproto that owns 'ofconn''s connmgr. */
390 ofconn_get_ofproto(const struct ofconn *ofconn)
392 return ofconn->connmgr->ofproto;
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. */
399 connmgr_retry(struct connmgr *mgr)
401 struct ofconn *ofconn;
403 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
404 ofconn->retry = true;
408 /* OpenFlow configuration. */
410 static void add_controller(struct connmgr *, const char *target, uint8_t dscp,
411 uint32_t allowed_versions);
412 static struct ofconn *find_controller_by_target(struct connmgr *,
414 static void update_fail_open(struct connmgr *);
415 static int set_pvconns(struct pvconn ***pvconnsp, size_t *n_pvconnsp,
416 const struct sset *);
418 /* Returns true if 'mgr' has any configured primary controllers.
420 * Service controllers do not count, but configured primary controllers do
421 * count whether or not they are currently connected. */
423 connmgr_has_controllers(const struct connmgr *mgr)
425 return !hmap_is_empty(&mgr->controllers);
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".
432 * The caller owns 'info' and everything in it and should free it when it is no
435 connmgr_get_controller_info(struct connmgr *mgr, struct shash *info)
437 const struct ofconn *ofconn;
439 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
440 const struct rconn *rconn = ofconn->rconn;
441 const char *target = rconn_get_target(rconn);
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);
450 shash_add(info, target, cinfo);
452 cinfo->is_connected = rconn_is_connected(rconn);
453 cinfo->role = ofconn->role;
458 cinfo->pairs.keys[cinfo->pairs.n] = "last_error";
459 cinfo->pairs.values[cinfo->pairs.n++]
460 = xstrdup(ovs_retval_to_string(last_error));
463 cinfo->pairs.keys[cinfo->pairs.n] = "state";
464 cinfo->pairs.values[cinfo->pairs.n++]
465 = xstrdup(rconn_get_state(rconn));
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));
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));
483 connmgr_free_controller_info(struct shash *info)
485 struct shash_node *node;
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]));
497 /* Changes 'mgr''s set of controllers to the 'n_controllers' controllers in
500 connmgr_set_controllers(struct connmgr *mgr,
501 const struct ofproto_controller *controllers,
502 size_t n_controllers, uint32_t allowed_versions)
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;
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];
516 if (!vconn_verify_name(c->target)) {
518 ofconn = find_controller_by_target(mgr, c->target);
520 VLOG_INFO("%s: added primary controller \"%s\"",
521 mgr->name, c->target);
523 } else if (rconn_get_allowed_versions(ofconn->rconn) !=
525 VLOG_INFO("%s: re-added primary controller \"%s\"",
526 mgr->name, c->target);
528 ofconn_destroy(ofconn);
531 add_controller(mgr, c->target, c->dscp, allowed_versions);
533 } else if (!pvconn_verify_name(c->target)) {
535 ofservice = ofservice_lookup(mgr, c->target);
537 VLOG_INFO("%s: added service controller \"%s\"",
538 mgr->name, c->target);
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);
547 ofservice_create(mgr, c->target, allowed_versions, c->dscp);
550 VLOG_WARN_RL(&rl, "%s: unsupported controller \"%s\"",
551 mgr->name, c->target);
555 shash_add_once(&new_controllers, c->target, &controllers[i]);
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;
564 c = shash_find_data(&new_controllers, target);
566 VLOG_INFO("%s: removed primary controller \"%s\"",
568 ofconn_destroy(ofconn);
570 ofconn_reconfigure(ofconn, c);
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;
580 c = shash_find_data(&new_controllers, target);
582 VLOG_INFO("%s: removed service controller \"%s\"",
584 ofservice_destroy(mgr, ofservice);
586 ofservice_reconfigure(ofservice, c);
590 shash_destroy(&new_controllers);
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);
599 /* Drops the connections between 'mgr' and all of its primary and secondary
600 * controllers, forcing them to reconnect. */
602 connmgr_reconnect(const struct connmgr *mgr)
604 struct ofconn *ofconn;
606 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
607 rconn_reconnect(ofconn->rconn);
611 /* Sets the "snoops" for 'mgr' to the pvconn targets listed in 'snoops'.
613 * A "snoop" is a pvconn to which every OpenFlow message to or from the most
614 * important controller on 'mgr' is mirrored. */
616 connmgr_set_snoops(struct connmgr *mgr, const struct sset *snoops)
618 return set_pvconns(&mgr->snoops, &mgr->n_snoops, snoops);
621 /* Adds each of the snoops currently configured on 'mgr' to 'snoops'. */
623 connmgr_get_snoops(const struct connmgr *mgr, struct sset *snoops)
627 for (i = 0; i < mgr->n_snoops; i++) {
628 sset_add(snoops, pvconn_get_name(mgr->snoops[i]));
632 /* Returns true if 'mgr' has at least one snoop, false if it has none. */
634 connmgr_has_snoops(const struct connmgr *mgr)
636 return mgr->n_snoops > 0;
639 /* Creates a new controller for 'target' in 'mgr'. update_controller() needs
640 * to be called later to finish the new ofconn's configuration. */
642 add_controller(struct connmgr *mgr, const char *target, uint8_t dscp,
643 uint32_t allowed_versions)
645 char *name = ofconn_make_name(mgr, target);
646 struct ofconn *ofconn;
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));
657 static struct ofconn *
658 find_controller_by_target(struct connmgr *mgr, const char *target)
660 struct ofconn *ofconn;
662 HMAP_FOR_EACH_WITH_HASH (ofconn, hmap_node,
663 hash_string(target, 0), &mgr->controllers) {
664 if (!strcmp(ofconn_get_target(ofconn), target)) {
672 update_in_band_remotes(struct connmgr *mgr)
674 struct sockaddr_in *addrs;
675 size_t max_addrs, n_addrs;
676 struct ofconn *ofconn;
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);
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);
689 if (ofconn->band == OFPROTO_OUT_OF_BAND) {
693 if (stream_parse_target_with_default_ports(target,
700 for (i = 0; i < mgr->n_extra_remotes; i++) {
701 addrs[n_addrs++] = mgr->extra_in_band_remotes[i];
704 /* Create or update or destroy in-band. */
707 in_band_create(mgr->ofproto, mgr->local_port_name, &mgr->in_band);
709 in_band_set_queue(mgr->in_band, mgr->in_band_queue);
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. */
715 in_band_set_remotes(mgr->in_band, addrs, n_addrs);
723 update_fail_open(struct connmgr *mgr)
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);
731 fail_open_destroy(mgr->fail_open);
732 mgr->fail_open = NULL;
737 set_pvconns(struct pvconn ***pvconnsp, size_t *n_pvconnsp,
738 const struct sset *sset)
740 struct pvconn **pvconns = *pvconnsp;
741 size_t n_pvconns = *n_pvconnsp;
746 for (i = 0; i < n_pvconns; i++) {
747 pvconn_close(pvconns[i]);
751 pvconns = xmalloc(sset_count(sset) * sizeof *pvconns);
753 SSET_FOR_EACH (name, sset) {
754 struct pvconn *pvconn;
756 error = pvconn_open(name, 0, 0, &pvconn);
758 pvconns[n_pvconns++] = pvconn;
760 VLOG_ERR("failed to listen on %s: %s", name, strerror(error));
768 *n_pvconnsp = n_pvconns;
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
777 snoop_preference(const struct ofconn *ofconn)
779 switch (ofconn->role) {
787 /* Shouldn't happen. */
792 /* One of 'mgr''s "snoop" pvconns has accepted a new connection on 'vconn'.
793 * Connects this vconn to a controller. */
795 add_snooper(struct connmgr *mgr, struct vconn *vconn)
797 struct ofconn *ofconn, *best;
799 /* Pick a controller for monitoring. */
801 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
802 if (ofconn->type == OFCONN_PRIMARY
803 && (!best || snoop_preference(ofconn) > snoop_preference(best))) {
809 rconn_add_monitor(best->rconn, vconn);
811 VLOG_INFO_RL(&rl, "no controller connection to snoop");
816 /* Public ofconn functions. */
818 /* Returns the connection type, either OFCONN_PRIMARY or OFCONN_SERVICE. */
820 ofconn_get_type(const struct ofconn *ofconn)
825 /* Sets the master election id.
827 * Returns true if successful, false if the id is stale
830 ofconn_set_master_election_id(struct ofconn *ofconn, uint64_t id)
832 if (ofconn->connmgr->master_election_id_defined
834 /* Unsigned difference interpreted as a two's complement signed
836 (int64_t)(id - ofconn->connmgr->master_election_id) < 0) {
839 ofconn->connmgr->master_election_id = id;
840 ofconn->connmgr->master_election_id_defined = true;
845 /* Returns the role configured for 'ofconn'.
847 * The default role, if no other role has been set, is NX_ROLE_OTHER. */
849 ofconn_get_role(const struct ofconn *ofconn)
854 /* Changes 'ofconn''s role to 'role'. If 'role' is NX_ROLE_MASTER then any
855 * existing master is demoted to a slave. */
857 ofconn_set_role(struct ofconn *ofconn, enum nx_role role)
859 if (role == NX_ROLE_MASTER) {
860 struct ofconn *other;
862 HMAP_FOR_EACH (other, hmap_node, &ofconn->connmgr->controllers) {
863 if (other->role == NX_ROLE_MASTER) {
864 other->role = NX_ROLE_SLAVE;
872 ofconn_set_invalid_ttl_to_controller(struct ofconn *ofconn, bool enable)
874 uint32_t bit = 1u << OFPR_INVALID_TTL;
876 ofconn->master_async_config[OAM_PACKET_IN] |= bit;
878 ofconn->master_async_config[OAM_PACKET_IN] &= ~bit;
883 ofconn_get_invalid_ttl_to_controller(struct ofconn *ofconn)
885 uint32_t bit = 1u << OFPR_INVALID_TTL;
886 return (ofconn->master_async_config[OAM_PACKET_IN] & bit) != 0;
889 /* Returns the currently configured protocol for 'ofconn', one of OFPUTIL_P_*.
891 * Returns OFPUTIL_P_NONE, which is not a valid protocol, if 'ofconn' hasn't
892 * completed version negotiation. This can't happen if at least one OpenFlow
893 * message, other than OFPT_HELLO, has been received on the connection (such as
894 * in ofproto.c's message handling code), since version negotiation is a
895 * prerequisite for starting to receive messages. This means that
896 * OFPUTIL_P_NONE is a special case that most callers need not worry about. */
897 enum ofputil_protocol
898 ofconn_get_protocol(const struct ofconn *ofconn)
900 if (ofconn->protocol == OFPUTIL_P_NONE &&
901 rconn_is_connected(ofconn->rconn)) {
902 int version = rconn_get_version(ofconn->rconn);
904 ofconn_set_protocol(CONST_CAST(struct ofconn *, ofconn),
905 ofputil_protocol_from_ofp_version(version));
909 return ofconn->protocol;
912 /* Sets the protocol for 'ofconn' to 'protocol' (one of OFPUTIL_P_*).
914 * (This doesn't actually send anything to accomplish this. Presumably the
915 * caller already did that.) */
917 ofconn_set_protocol(struct ofconn *ofconn, enum ofputil_protocol protocol)
919 ofconn->protocol = protocol;
922 /* Returns the currently configured packet in format for 'ofconn', one of
925 * The default, if no other format has been set, is NXPIF_OPENFLOW10. */
926 enum nx_packet_in_format
927 ofconn_get_packet_in_format(struct ofconn *ofconn)
929 return ofconn->packet_in_format;
932 /* Sets the packet in format for 'ofconn' to 'packet_in_format' (one of
935 ofconn_set_packet_in_format(struct ofconn *ofconn,
936 enum nx_packet_in_format packet_in_format)
938 ofconn->packet_in_format = packet_in_format;
941 /* Sets the controller connection ID for 'ofconn' to 'controller_id'.
943 * The connection controller ID is used for OFPP_CONTROLLER and
944 * NXAST_CONTROLLER actions. See "struct nx_action_controller" for details. */
946 ofconn_set_controller_id(struct ofconn *ofconn, uint16_t controller_id)
948 ofconn->controller_id = controller_id;
951 /* Returns the default miss send length for 'ofconn'. */
953 ofconn_get_miss_send_len(const struct ofconn *ofconn)
955 return ofconn->miss_send_len;
958 /* Sets the default miss send length for 'ofconn' to 'miss_send_len'. */
960 ofconn_set_miss_send_len(struct ofconn *ofconn, int miss_send_len)
962 ofconn->miss_send_len = miss_send_len;
966 ofconn_set_async_config(struct ofconn *ofconn,
967 const uint32_t master_masks[OAM_N_TYPES],
968 const uint32_t slave_masks[OAM_N_TYPES])
970 size_t size = sizeof ofconn->master_async_config;
971 memcpy(ofconn->master_async_config, master_masks, size);
972 memcpy(ofconn->slave_async_config, slave_masks, size);
975 /* Sends 'msg' on 'ofconn', accounting it as a reply. (If there is a
976 * sufficient number of OpenFlow replies in-flight on a single ofconn, then the
977 * connmgr will stop accepting new OpenFlow requests on that ofconn until the
978 * controller has accepted some of the replies.) */
980 ofconn_send_reply(const struct ofconn *ofconn, struct ofpbuf *msg)
982 ofconn_send(ofconn, msg, ofconn->reply_counter);
985 /* Sends each of the messages in list 'replies' on 'ofconn' in order,
986 * accounting them as replies. */
988 ofconn_send_replies(const struct ofconn *ofconn, struct list *replies)
990 struct ofpbuf *reply, *next;
992 LIST_FOR_EACH_SAFE (reply, next, list_node, replies) {
993 list_remove(&reply->list_node);
994 ofconn_send_reply(ofconn, reply);
998 /* Sends 'error' on 'ofconn', as a reply to 'request'. Only at most the
999 * first 64 bytes of 'request' are used. */
1001 ofconn_send_error(const struct ofconn *ofconn,
1002 const struct ofp_header *request, enum ofperr error)
1004 static struct vlog_rate_limit err_rl = VLOG_RATE_LIMIT_INIT(10, 10);
1005 struct ofpbuf *reply;
1007 reply = ofperr_encode_reply(error, request);
1008 if (!VLOG_DROP_INFO(&err_rl)) {
1009 const char *type_name;
1013 request_len = ntohs(request->length);
1014 type_name = (!ofpraw_decode_partial(&raw, request,
1015 MIN(64, request_len))
1016 ? ofpraw_get_name(raw)
1019 VLOG_INFO("%s: sending %s error reply to %s message",
1020 rconn_get_name(ofconn->rconn), ofperr_to_string(error),
1023 ofconn_send_reply(ofconn, reply);
1026 /* Same as pktbuf_retrieve(), using the pktbuf owned by 'ofconn'. */
1028 ofconn_pktbuf_retrieve(struct ofconn *ofconn, uint32_t id,
1029 struct ofpbuf **bufferp, uint16_t *in_port)
1031 return pktbuf_retrieve(ofconn->pktbuf, id, bufferp, in_port);
1034 /* Returns true if 'ofconn' has any pending opgroups. */
1036 ofconn_has_pending_opgroups(const struct ofconn *ofconn)
1038 return !list_is_empty(&ofconn->opgroups);
1041 /* Adds 'ofconn_node' to 'ofconn''s list of pending opgroups.
1043 * If 'ofconn' is destroyed or its connection drops, then 'ofconn' will remove
1044 * 'ofconn_node' from the list and re-initialize it with list_init(). The
1045 * client may, therefore, use list_is_empty(ofconn_node) to determine whether
1046 * 'ofconn_node' is still associated with an active ofconn.
1048 * The client may also remove ofconn_node from the list itself, with
1051 ofconn_add_opgroup(struct ofconn *ofconn, struct list *ofconn_node)
1053 list_push_back(&ofconn->opgroups, ofconn_node);
1056 /* Private ofconn functions. */
1059 ofconn_get_target(const struct ofconn *ofconn)
1061 return rconn_get_target(ofconn->rconn);
1064 static struct ofconn *
1065 ofconn_create(struct connmgr *mgr, struct rconn *rconn, enum ofconn_type type,
1066 bool enable_async_msgs)
1068 struct ofconn *ofconn;
1070 ofconn = xzalloc(sizeof *ofconn);
1071 ofconn->connmgr = mgr;
1072 list_push_back(&mgr->all_conns, &ofconn->node);
1073 ofconn->rconn = rconn;
1074 ofconn->type = type;
1075 ofconn->enable_async_msgs = enable_async_msgs;
1077 list_init(&ofconn->opgroups);
1079 hmap_init(&ofconn->monitors);
1080 list_init(&ofconn->updates);
1082 ofconn_flush(ofconn);
1087 /* Clears all of the state in 'ofconn' that should not persist from one
1088 * connection to the next. */
1090 ofconn_flush(struct ofconn *ofconn)
1092 struct ofmonitor *monitor, *next_monitor;
1095 ofconn->role = NX_ROLE_OTHER;
1096 ofconn_set_protocol(ofconn, OFPUTIL_P_NONE);
1097 ofconn->packet_in_format = NXPIF_OPENFLOW10;
1099 /* Disassociate 'ofconn' from all of the ofopgroups that it initiated that
1100 * have not yet completed. (Those ofopgroups will still run to completion
1101 * in the usual way, but any errors that they run into will not be reported
1102 * on any OpenFlow channel.)
1104 * Also discard any blocked operation on 'ofconn'. */
1105 while (!list_is_empty(&ofconn->opgroups)) {
1106 list_init(list_pop_front(&ofconn->opgroups));
1108 ofpbuf_delete(ofconn->blocked);
1109 ofconn->blocked = NULL;
1111 rconn_packet_counter_destroy(ofconn->packet_in_counter);
1112 ofconn->packet_in_counter = rconn_packet_counter_create();
1113 for (i = 0; i < N_SCHEDULERS; i++) {
1114 if (ofconn->schedulers[i]) {
1117 pinsched_get_limits(ofconn->schedulers[i], &rate, &burst);
1118 pinsched_destroy(ofconn->schedulers[i]);
1119 ofconn->schedulers[i] = pinsched_create(rate, burst);
1122 if (ofconn->pktbuf) {
1123 pktbuf_destroy(ofconn->pktbuf);
1124 ofconn->pktbuf = pktbuf_create();
1126 ofconn->miss_send_len = (ofconn->type == OFCONN_PRIMARY
1127 ? OFP_DEFAULT_MISS_SEND_LEN
1129 ofconn->controller_id = 0;
1131 rconn_packet_counter_destroy(ofconn->reply_counter);
1132 ofconn->reply_counter = rconn_packet_counter_create();
1134 if (ofconn->enable_async_msgs) {
1135 uint32_t *master = ofconn->master_async_config;
1136 uint32_t *slave = ofconn->slave_async_config;
1138 /* "master" and "other" roles get all asynchronous messages by default,
1139 * except that the controller needs to enable nonstandard "packet-in"
1140 * reasons itself. */
1141 master[OAM_PACKET_IN] = (1u << OFPR_NO_MATCH) | (1u << OFPR_ACTION);
1142 master[OAM_PORT_STATUS] = ((1u << OFPPR_ADD)
1143 | (1u << OFPPR_DELETE)
1144 | (1u << OFPPR_MODIFY));
1145 master[OAM_FLOW_REMOVED] = ((1u << OFPRR_IDLE_TIMEOUT)
1146 | (1u << OFPRR_HARD_TIMEOUT)
1147 | (1u << OFPRR_DELETE));
1149 /* "slave" role gets port status updates by default. */
1150 slave[OAM_PACKET_IN] = 0;
1151 slave[OAM_PORT_STATUS] = ((1u << OFPPR_ADD)
1152 | (1u << OFPPR_DELETE)
1153 | (1u << OFPPR_MODIFY));
1154 slave[OAM_FLOW_REMOVED] = 0;
1156 memset(ofconn->master_async_config, 0,
1157 sizeof ofconn->master_async_config);
1158 memset(ofconn->slave_async_config, 0,
1159 sizeof ofconn->slave_async_config);
1162 HMAP_FOR_EACH_SAFE (monitor, next_monitor, ofconn_node,
1163 &ofconn->monitors) {
1164 ofmonitor_destroy(monitor);
1166 rconn_packet_counter_destroy(ofconn->monitor_counter);
1167 ofconn->monitor_counter = rconn_packet_counter_create();
1168 ofpbuf_list_delete(&ofconn->updates); /* ...but it should be empty. */
1172 ofconn_destroy(struct ofconn *ofconn)
1174 ofconn_flush(ofconn);
1176 if (ofconn->type == OFCONN_PRIMARY) {
1177 hmap_remove(&ofconn->connmgr->controllers, &ofconn->hmap_node);
1180 list_remove(&ofconn->node);
1181 rconn_destroy(ofconn->rconn);
1182 rconn_packet_counter_destroy(ofconn->packet_in_counter);
1183 rconn_packet_counter_destroy(ofconn->reply_counter);
1184 pktbuf_destroy(ofconn->pktbuf);
1185 rconn_packet_counter_destroy(ofconn->monitor_counter);
1189 /* Reconfigures 'ofconn' to match 'c'. 'ofconn' and 'c' must have the same
1192 ofconn_reconfigure(struct ofconn *ofconn, const struct ofproto_controller *c)
1196 ofconn->band = c->band;
1197 ofconn->enable_async_msgs = c->enable_async_msgs;
1199 rconn_set_max_backoff(ofconn->rconn, c->max_backoff);
1201 probe_interval = c->probe_interval ? MAX(c->probe_interval, 5) : 0;
1202 rconn_set_probe_interval(ofconn->rconn, probe_interval);
1204 ofconn_set_rate_limit(ofconn, c->rate_limit, c->burst_limit);
1206 /* If dscp value changed reconnect. */
1207 if (c->dscp != rconn_get_dscp(ofconn->rconn)) {
1208 rconn_set_dscp(ofconn->rconn, c->dscp);
1209 rconn_reconnect(ofconn->rconn);
1213 /* Returns true if it makes sense for 'ofconn' to receive and process OpenFlow
1216 ofconn_may_recv(const struct ofconn *ofconn)
1218 int count = ofconn->reply_counter->n_packets;
1219 return (!ofconn->blocked || ofconn->retry) && count < OFCONN_REPLY_MAX;
1223 ofconn_run(struct ofconn *ofconn,
1224 bool (*handle_openflow)(struct ofconn *, struct ofpbuf *ofp_msg))
1226 struct connmgr *mgr = ofconn->connmgr;
1229 for (i = 0; i < N_SCHEDULERS; i++) {
1230 pinsched_run(ofconn->schedulers[i], do_send_packet_in, ofconn);
1233 rconn_run(ofconn->rconn);
1235 if (handle_openflow) {
1236 /* Limit the number of iterations to avoid starving other tasks. */
1237 for (i = 0; i < 50 && ofconn_may_recv(ofconn); i++) {
1238 struct ofpbuf *of_msg;
1240 of_msg = (ofconn->blocked
1242 : rconn_recv(ofconn->rconn));
1246 if (mgr->fail_open) {
1247 fail_open_maybe_recover(mgr->fail_open);
1250 if (handle_openflow(ofconn, of_msg)) {
1251 ofpbuf_delete(of_msg);
1252 ofconn->blocked = NULL;
1254 ofconn->blocked = of_msg;
1255 ofconn->retry = false;
1260 if (!rconn_is_alive(ofconn->rconn)) {
1261 ofconn_destroy(ofconn);
1262 } else if (!rconn_is_connected(ofconn->rconn)) {
1263 ofconn_flush(ofconn);
1268 ofconn_wait(struct ofconn *ofconn, bool handling_openflow)
1272 for (i = 0; i < N_SCHEDULERS; i++) {
1273 pinsched_wait(ofconn->schedulers[i]);
1275 rconn_run_wait(ofconn->rconn);
1276 if (handling_openflow && ofconn_may_recv(ofconn)) {
1277 rconn_recv_wait(ofconn->rconn);
1281 /* Returns true if 'ofconn' should receive asynchronous messages of the given
1282 * OAM_* 'type' and 'reason', which should be a OFPR_* value for OAM_PACKET_IN,
1283 * a OFPPR_* value for OAM_PORT_STATUS, or an OFPRR_* value for
1284 * OAM_FLOW_REMOVED. Returns false if the message should not be sent on
1287 ofconn_receives_async_msg(const struct ofconn *ofconn,
1288 enum ofconn_async_msg_type type,
1289 unsigned int reason)
1291 const uint32_t *async_config;
1293 ovs_assert(reason < 32);
1294 ovs_assert((unsigned int) type < OAM_N_TYPES);
1296 if (ofconn_get_protocol(ofconn) == OFPUTIL_P_NONE
1297 || !rconn_is_connected(ofconn->rconn)) {
1301 /* Keep the following code in sync with the documentation in the
1302 * "Asynchronous Messages" section in DESIGN. */
1304 if (ofconn->type == OFCONN_SERVICE && !ofconn->miss_send_len) {
1305 /* Service connections don't get asynchronous messages unless they have
1306 * explicitly asked for them by setting a nonzero miss send length. */
1310 async_config = (ofconn->role == NX_ROLE_SLAVE
1311 ? ofconn->slave_async_config
1312 : ofconn->master_async_config);
1313 if (!(async_config[type] & (1u << reason))) {
1320 /* Returns a human-readable name for an OpenFlow connection between 'mgr' and
1321 * 'target', suitable for use in log messages for identifying the connection.
1323 * The name is dynamically allocated. The caller should free it (with free())
1324 * when it is no longer needed. */
1326 ofconn_make_name(const struct connmgr *mgr, const char *target)
1328 return xasprintf("%s<->%s", mgr->name, target);
1332 ofconn_set_rate_limit(struct ofconn *ofconn, int rate, int burst)
1336 for (i = 0; i < N_SCHEDULERS; i++) {
1337 struct pinsched **s = &ofconn->schedulers[i];
1341 *s = pinsched_create(rate, burst);
1343 pinsched_set_limits(*s, rate, burst);
1346 pinsched_destroy(*s);
1353 ofconn_send(const struct ofconn *ofconn, struct ofpbuf *msg,
1354 struct rconn_packet_counter *counter)
1356 ofpmsg_update_length(msg);
1357 rconn_send(ofconn->rconn, msg, counter);
1360 /* Sending asynchronous messages. */
1362 static void schedule_packet_in(struct ofconn *, struct ofputil_packet_in);
1364 /* Sends an OFPT_PORT_STATUS message with 'opp' and 'reason' to appropriate
1365 * controllers managed by 'mgr'. */
1367 connmgr_send_port_status(struct connmgr *mgr,
1368 const struct ofputil_phy_port *pp, uint8_t reason)
1370 /* XXX Should limit the number of queued port status change messages. */
1371 struct ofputil_port_status ps;
1372 struct ofconn *ofconn;
1376 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1377 if (ofconn_receives_async_msg(ofconn, OAM_PORT_STATUS, reason)) {
1380 msg = ofputil_encode_port_status(&ps, ofconn_get_protocol(ofconn));
1381 ofconn_send(ofconn, msg, NULL);
1386 /* Sends an OFPT_FLOW_REMOVED or NXT_FLOW_REMOVED message based on 'fr' to
1387 * appropriate controllers managed by 'mgr'. */
1389 connmgr_send_flow_removed(struct connmgr *mgr,
1390 const struct ofputil_flow_removed *fr)
1392 struct ofconn *ofconn;
1394 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1395 if (ofconn_receives_async_msg(ofconn, OAM_FLOW_REMOVED, fr->reason)) {
1398 /* Account flow expirations as replies to OpenFlow requests. That
1399 * works because preventing OpenFlow requests from being processed
1400 * also prevents new flows from being added (and expiring). (It
1401 * also prevents processing OpenFlow requests that would not add
1402 * new flows, so it is imperfect.) */
1403 msg = ofputil_encode_flow_removed(fr, ofconn_get_protocol(ofconn));
1404 ofconn_send_reply(ofconn, msg);
1409 /* Given 'pin', sends an OFPT_PACKET_IN message to each OpenFlow controller as
1410 * necessary according to their individual configurations.
1412 * The caller doesn't need to fill in pin->buffer_id or pin->total_len. */
1414 connmgr_send_packet_in(struct connmgr *mgr,
1415 const struct ofputil_packet_in *pin)
1417 struct ofconn *ofconn;
1419 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1420 if (ofconn_receives_async_msg(ofconn, OAM_PACKET_IN, pin->reason)
1421 && ofconn->controller_id == pin->controller_id) {
1422 schedule_packet_in(ofconn, *pin);
1427 /* pinsched callback for sending 'ofp_packet_in' on 'ofconn'. */
1429 do_send_packet_in(struct ofpbuf *ofp_packet_in, void *ofconn_)
1431 struct ofconn *ofconn = ofconn_;
1433 rconn_send_with_limit(ofconn->rconn, ofp_packet_in,
1434 ofconn->packet_in_counter, 100);
1437 /* Takes 'pin', composes an OpenFlow packet-in message from it, and passes it
1438 * to 'ofconn''s packet scheduler for sending. */
1440 schedule_packet_in(struct ofconn *ofconn, struct ofputil_packet_in pin)
1442 struct connmgr *mgr = ofconn->connmgr;
1444 pin.total_len = pin.packet_len;
1446 /* Get OpenFlow buffer_id. */
1447 if (pin.reason == OFPR_ACTION) {
1448 pin.buffer_id = UINT32_MAX;
1449 } else if (mgr->fail_open && fail_open_is_active(mgr->fail_open)) {
1450 pin.buffer_id = pktbuf_get_null();
1451 } else if (!ofconn->pktbuf) {
1452 pin.buffer_id = UINT32_MAX;
1454 pin.buffer_id = pktbuf_save(ofconn->pktbuf, pin.packet, pin.packet_len,
1458 /* Figure out how much of the packet to send. */
1459 if (pin.reason == OFPR_NO_MATCH) {
1460 pin.send_len = pin.packet_len;
1462 /* Caller should have initialized 'send_len' to 'max_len' specified in
1465 if (pin.buffer_id != UINT32_MAX) {
1466 pin.send_len = MIN(pin.send_len, ofconn->miss_send_len);
1469 /* Make OFPT_PACKET_IN and hand over to packet scheduler. It might
1470 * immediately call into do_send_packet_in() or it might buffer it for a
1471 * while (until a later call to pinsched_run()). */
1472 pinsched_send(ofconn->schedulers[pin.reason == OFPR_NO_MATCH ? 0 : 1],
1474 ofputil_encode_packet_in(&pin, ofconn_get_protocol(ofconn),
1475 ofconn->packet_in_format),
1476 do_send_packet_in, ofconn);
1479 /* Fail-open settings. */
1481 /* Returns the failure handling mode (OFPROTO_FAIL_SECURE or
1482 * OFPROTO_FAIL_STANDALONE) for 'mgr'. */
1483 enum ofproto_fail_mode
1484 connmgr_get_fail_mode(const struct connmgr *mgr)
1486 return mgr->fail_mode;
1489 /* Sets the failure handling mode for 'mgr' to 'fail_mode' (either
1490 * OFPROTO_FAIL_SECURE or OFPROTO_FAIL_STANDALONE). */
1492 connmgr_set_fail_mode(struct connmgr *mgr, enum ofproto_fail_mode fail_mode)
1494 if (mgr->fail_mode != fail_mode) {
1495 mgr->fail_mode = fail_mode;
1496 update_fail_open(mgr);
1497 if (!connmgr_has_controllers(mgr)) {
1498 ofproto_flush_flows(mgr->ofproto);
1503 /* Fail-open implementation. */
1505 /* Returns the longest probe interval among the primary controllers configured
1506 * on 'mgr'. Returns 0 if there are no primary controllers. */
1508 connmgr_get_max_probe_interval(const struct connmgr *mgr)
1510 const struct ofconn *ofconn;
1511 int max_probe_interval;
1513 max_probe_interval = 0;
1514 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
1515 int probe_interval = rconn_get_probe_interval(ofconn->rconn);
1516 max_probe_interval = MAX(max_probe_interval, probe_interval);
1518 return max_probe_interval;
1521 /* Returns the number of seconds for which all of 'mgr's primary controllers
1522 * have been disconnected. Returns 0 if 'mgr' has no primary controllers. */
1524 connmgr_failure_duration(const struct connmgr *mgr)
1526 const struct ofconn *ofconn;
1527 int min_failure_duration;
1529 if (!connmgr_has_controllers(mgr)) {
1533 min_failure_duration = INT_MAX;
1534 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
1535 int failure_duration = rconn_failure_duration(ofconn->rconn);
1536 min_failure_duration = MIN(min_failure_duration, failure_duration);
1538 return min_failure_duration;
1541 /* Returns true if at least one primary controller is connected (regardless of
1542 * whether those controllers are believed to have authenticated and accepted
1543 * this switch), false if none of them are connected. */
1545 connmgr_is_any_controller_connected(const struct connmgr *mgr)
1547 const struct ofconn *ofconn;
1549 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
1550 if (rconn_is_connected(ofconn->rconn)) {
1557 /* Returns true if at least one primary controller is believed to have
1558 * authenticated and accepted this switch, false otherwise. */
1560 connmgr_is_any_controller_admitted(const struct connmgr *mgr)
1562 const struct ofconn *ofconn;
1564 HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) {
1565 if (rconn_is_admitted(ofconn->rconn)) {
1572 /* In-band configuration. */
1574 static bool any_extras_changed(const struct connmgr *,
1575 const struct sockaddr_in *extras, size_t n);
1577 /* Sets the 'n' TCP port addresses in 'extras' as ones to which 'mgr''s
1578 * in-band control should guarantee access, in the same way that in-band
1579 * control guarantees access to OpenFlow controllers. */
1581 connmgr_set_extra_in_band_remotes(struct connmgr *mgr,
1582 const struct sockaddr_in *extras, size_t n)
1584 if (!any_extras_changed(mgr, extras, n)) {
1588 free(mgr->extra_in_band_remotes);
1589 mgr->n_extra_remotes = n;
1590 mgr->extra_in_band_remotes = xmemdup(extras, n * sizeof *extras);
1592 update_in_band_remotes(mgr);
1595 /* Sets the OpenFlow queue used by flows set up by in-band control on
1596 * 'mgr' to 'queue_id'. If 'queue_id' is negative, then in-band control
1597 * flows will use the default queue. */
1599 connmgr_set_in_band_queue(struct connmgr *mgr, int queue_id)
1601 if (queue_id != mgr->in_band_queue) {
1602 mgr->in_band_queue = queue_id;
1603 update_in_band_remotes(mgr);
1608 any_extras_changed(const struct connmgr *mgr,
1609 const struct sockaddr_in *extras, size_t n)
1613 if (n != mgr->n_extra_remotes) {
1617 for (i = 0; i < n; i++) {
1618 const struct sockaddr_in *old = &mgr->extra_in_band_remotes[i];
1619 const struct sockaddr_in *new = &extras[i];
1621 if (old->sin_addr.s_addr != new->sin_addr.s_addr ||
1622 old->sin_port != new->sin_port) {
1630 /* In-band implementation. */
1633 connmgr_msg_in_hook(struct connmgr *mgr, const struct flow *flow,
1634 const struct ofpbuf *packet)
1636 return mgr->in_band && in_band_msg_in_hook(mgr->in_band, flow, packet);
1640 connmgr_may_set_up_flow(struct connmgr *mgr, const struct flow *flow,
1641 uint32_t local_odp_port,
1642 const struct nlattr *odp_actions,
1645 return !mgr->in_band || in_band_rule_check(flow, local_odp_port,
1646 odp_actions, actions_len);
1649 /* Fail-open and in-band implementation. */
1651 /* Called by 'ofproto' after all flows have been flushed, to allow fail-open
1652 * and standalone mode to re-create their flows.
1654 * In-band control has more sophisticated code that manages flows itself. */
1656 connmgr_flushed(struct connmgr *mgr)
1658 if (mgr->fail_open) {
1659 fail_open_flushed(mgr->fail_open);
1662 /* If there are no controllers and we're in standalone mode, set up a flow
1663 * that matches every packet and directs them to OFPP_NORMAL (which goes to
1664 * us). Otherwise, the switch is in secure mode and we won't pass any
1665 * traffic until a controller has been defined and it tells us to do so. */
1666 if (!connmgr_has_controllers(mgr)
1667 && mgr->fail_mode == OFPROTO_FAIL_STANDALONE) {
1668 struct ofpbuf ofpacts;
1671 ofpbuf_init(&ofpacts, OFPACT_OUTPUT_SIZE);
1672 ofpact_put_OUTPUT(&ofpacts)->port = OFPP_NORMAL;
1673 ofpact_pad(&ofpacts);
1675 match_init_catchall(&match);
1676 ofproto_add_flow(mgr->ofproto, &match, 0, ofpacts.data, ofpacts.size);
1678 ofpbuf_uninit(&ofpacts);
1682 /* Creates a new ofservice for 'target' in 'mgr'. Returns 0 if successful,
1683 * otherwise a positive errno value.
1685 * ofservice_reconfigure() must be called to fully configure the new
1688 ofservice_create(struct connmgr *mgr, const char *target,
1689 uint32_t allowed_versions, uint8_t dscp)
1691 struct ofservice *ofservice;
1692 struct pvconn *pvconn;
1695 error = pvconn_open(target, allowed_versions, dscp, &pvconn);
1700 ofservice = xzalloc(sizeof *ofservice);
1701 hmap_insert(&mgr->services, &ofservice->node, hash_string(target, 0));
1702 ofservice->pvconn = pvconn;
1703 ofservice->allowed_versions = allowed_versions;
1709 ofservice_destroy(struct connmgr *mgr, struct ofservice *ofservice)
1711 hmap_remove(&mgr->services, &ofservice->node);
1712 pvconn_close(ofservice->pvconn);
1717 ofservice_reconfigure(struct ofservice *ofservice,
1718 const struct ofproto_controller *c)
1720 ofservice->probe_interval = c->probe_interval;
1721 ofservice->rate_limit = c->rate_limit;
1722 ofservice->burst_limit = c->burst_limit;
1723 ofservice->enable_async_msgs = c->enable_async_msgs;
1724 ofservice->dscp = c->dscp;
1727 /* Finds and returns the ofservice within 'mgr' that has the given
1728 * 'target', or a null pointer if none exists. */
1729 static struct ofservice *
1730 ofservice_lookup(struct connmgr *mgr, const char *target)
1732 struct ofservice *ofservice;
1734 HMAP_FOR_EACH_WITH_HASH (ofservice, node, hash_string(target, 0),
1736 if (!strcmp(pvconn_get_name(ofservice->pvconn), target)) {
1743 /* Flow monitors (NXST_FLOW_MONITOR). */
1745 /* A counter incremented when something significant happens to an OpenFlow
1748 * - When a rule is added, its 'add_seqno' and 'modify_seqno' are set to
1749 * the current value (which is then incremented).
1751 * - When a rule is modified, its 'modify_seqno' is set to the current
1752 * value (which is then incremented).
1754 * Thus, by comparing an old value of monitor_seqno against a rule's
1755 * 'add_seqno', one can tell whether the rule was added before or after the old
1756 * value was read, and similarly for 'modify_seqno'.
1758 * 32 bits should normally be sufficient (and would be nice, to save space in
1759 * each rule) but then we'd have to have some special cases for wraparound.
1761 * We initialize monitor_seqno to 1 to allow 0 to be used as an invalid
1763 static uint64_t monitor_seqno = 1;
1765 COVERAGE_DEFINE(ofmonitor_pause);
1766 COVERAGE_DEFINE(ofmonitor_resume);
1769 ofmonitor_create(const struct ofputil_flow_monitor_request *request,
1770 struct ofconn *ofconn, struct ofmonitor **monitorp)
1772 struct ofmonitor *m;
1776 m = ofmonitor_lookup(ofconn, request->id);
1778 return OFPERR_NXBRC_FM_DUPLICATE_ID;
1781 m = xmalloc(sizeof *m);
1783 hmap_insert(&ofconn->monitors, &m->ofconn_node, hash_int(request->id, 0));
1784 m->id = request->id;
1785 m->flags = request->flags;
1786 m->out_port = request->out_port;
1787 m->table_id = request->table_id;
1788 minimatch_init(&m->match, &request->match);
1795 ofmonitor_lookup(struct ofconn *ofconn, uint32_t id)
1797 struct ofmonitor *m;
1799 HMAP_FOR_EACH_IN_BUCKET (m, ofconn_node, hash_int(id, 0),
1800 &ofconn->monitors) {
1809 ofmonitor_destroy(struct ofmonitor *m)
1812 minimatch_destroy(&m->match);
1813 hmap_remove(&m->ofconn->monitors, &m->ofconn_node);
1819 ofmonitor_report(struct connmgr *mgr, struct rule *rule,
1820 enum nx_flow_update_event event,
1821 enum ofp_flow_removed_reason reason,
1822 const struct ofconn *abbrev_ofconn, ovs_be32 abbrev_xid)
1824 enum nx_flow_monitor_flags update;
1825 struct ofconn *ofconn;
1830 rule->add_seqno = rule->modify_seqno = monitor_seqno++;
1834 update = NXFMF_DELETE;
1837 case NXFME_MODIFIED:
1838 update = NXFMF_MODIFY;
1839 rule->modify_seqno = monitor_seqno++;
1847 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1848 enum nx_flow_monitor_flags flags = 0;
1849 struct ofmonitor *m;
1851 if (ofconn->monitor_paused) {
1852 /* Only send NXFME_DELETED notifications for flows that were added
1853 * before we paused. */
1854 if (event != NXFME_DELETED
1855 || rule->add_seqno > ofconn->monitor_paused) {
1860 HMAP_FOR_EACH (m, ofconn_node, &ofconn->monitors) {
1861 if (m->flags & update
1862 && (m->table_id == 0xff || m->table_id == rule->table_id)
1863 && ofoperation_has_out_port(rule->pending, m->out_port)
1864 && cls_rule_is_loose_match(&rule->cr, &m->match)) {
1870 if (list_is_empty(&ofconn->updates)) {
1871 ofputil_start_flow_update(&ofconn->updates);
1872 ofconn->sent_abbrev_update = false;
1875 if (ofconn != abbrev_ofconn || ofconn->monitor_paused) {
1876 struct ofputil_flow_update fu;
1880 fu.reason = event == NXFME_DELETED ? reason : 0;
1881 fu.idle_timeout = rule->idle_timeout;
1882 fu.hard_timeout = rule->hard_timeout;
1883 fu.table_id = rule->table_id;
1884 fu.cookie = rule->flow_cookie;
1885 minimatch_expand(&rule->cr.match, &match);
1887 fu.priority = rule->cr.priority;
1888 if (flags & NXFMF_ACTIONS) {
1889 fu.ofpacts = rule->ofpacts;
1890 fu.ofpacts_len = rule->ofpacts_len;
1895 ofputil_append_flow_update(&fu, &ofconn->updates);
1896 } else if (!ofconn->sent_abbrev_update) {
1897 struct ofputil_flow_update fu;
1899 fu.event = NXFME_ABBREV;
1900 fu.xid = abbrev_xid;
1901 ofputil_append_flow_update(&fu, &ofconn->updates);
1903 ofconn->sent_abbrev_update = true;
1910 ofmonitor_flush(struct connmgr *mgr)
1912 struct ofconn *ofconn;
1914 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1915 struct ofpbuf *msg, *next;
1917 LIST_FOR_EACH_SAFE (msg, next, list_node, &ofconn->updates) {
1918 list_remove(&msg->list_node);
1919 ofconn_send(ofconn, msg, ofconn->monitor_counter);
1920 if (!ofconn->monitor_paused
1921 && ofconn->monitor_counter->n_bytes > 128 * 1024) {
1922 struct ofpbuf *pause;
1924 COVERAGE_INC(ofmonitor_pause);
1925 ofconn->monitor_paused = monitor_seqno++;
1926 pause = ofpraw_alloc_xid(OFPRAW_NXT_FLOW_MONITOR_PAUSED,
1927 OFP10_VERSION, htonl(0), 0);
1928 ofconn_send(ofconn, pause, ofconn->monitor_counter);
1935 ofmonitor_resume(struct ofconn *ofconn)
1937 struct ofpbuf *resumed;
1938 struct ofmonitor *m;
1943 HMAP_FOR_EACH (m, ofconn_node, &ofconn->monitors) {
1944 ofmonitor_collect_resume_rules(m, ofconn->monitor_paused, &rules);
1948 ofmonitor_compose_refresh_updates(&rules, &msgs);
1950 resumed = ofpraw_alloc_xid(OFPRAW_NXT_FLOW_MONITOR_RESUMED, OFP10_VERSION,
1952 list_push_back(&msgs, &resumed->list_node);
1953 ofconn_send_replies(ofconn, &msgs);
1955 ofconn->monitor_paused = 0;
1959 ofmonitor_run(struct connmgr *mgr)
1961 struct ofconn *ofconn;
1963 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1964 if (ofconn->monitor_paused && !ofconn->monitor_counter->n_packets) {
1965 COVERAGE_INC(ofmonitor_resume);
1966 ofmonitor_resume(ofconn);
1972 ofmonitor_wait(struct connmgr *mgr)
1974 struct ofconn *ofconn;
1976 LIST_FOR_EACH (ofconn, node, &mgr->all_conns) {
1977 if (ofconn->monitor_paused && !ofconn->monitor_counter->n_packets) {
1978 poll_immediate_wake();