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064af421 | 1 | /* |
e0edde6f | 2 | * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc. |
064af421 | 3 | * |
a14bc59f BP |
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: | |
064af421 | 7 | * |
a14bc59f BP |
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. | |
064af421 BP |
15 | */ |
16 | ||
17 | #include <config.h> | |
18 | #include "rconn.h" | |
19 | #include <assert.h> | |
20 | #include <errno.h> | |
21 | #include <limits.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include "coverage.h" | |
982697a4 | 25 | #include "ofp-msgs.h" |
fa37b408 | 26 | #include "ofp-util.h" |
064af421 BP |
27 | #include "ofpbuf.h" |
28 | #include "openflow/openflow.h" | |
29 | #include "poll-loop.h" | |
30 | #include "sat-math.h" | |
31 | #include "timeval.h" | |
32 | #include "util.h" | |
33 | #include "vconn.h" | |
064af421 BP |
34 | #include "vlog.h" |
35 | ||
d98e6007 | 36 | VLOG_DEFINE_THIS_MODULE(rconn); |
5136ce49 | 37 | |
d76f09ea BP |
38 | COVERAGE_DEFINE(rconn_discarded); |
39 | COVERAGE_DEFINE(rconn_overflow); | |
40 | COVERAGE_DEFINE(rconn_queued); | |
41 | COVERAGE_DEFINE(rconn_sent); | |
42 | ||
064af421 BP |
43 | #define STATES \ |
44 | STATE(VOID, 1 << 0) \ | |
45 | STATE(BACKOFF, 1 << 1) \ | |
46 | STATE(CONNECTING, 1 << 2) \ | |
47 | STATE(ACTIVE, 1 << 3) \ | |
48 | STATE(IDLE, 1 << 4) | |
49 | enum state { | |
50 | #define STATE(NAME, VALUE) S_##NAME = VALUE, | |
51 | STATES | |
52 | #undef STATE | |
53 | }; | |
54 | ||
55 | static const char * | |
56 | state_name(enum state state) | |
57 | { | |
58 | switch (state) { | |
59 | #define STATE(NAME, VALUE) case S_##NAME: return #NAME; | |
60 | STATES | |
61 | #undef STATE | |
62 | } | |
63 | return "***ERROR***"; | |
64 | } | |
65 | ||
66 | /* A reliable connection to an OpenFlow switch or controller. | |
67 | * | |
68 | * See the large comment in rconn.h for more information. */ | |
69 | struct rconn { | |
70 | enum state state; | |
71 | time_t state_entered; | |
72 | ||
73 | struct vconn *vconn; | |
eb15cdbb BP |
74 | char *name; /* Human-readable descriptive name. */ |
75 | char *target; /* vconn name, passed to vconn_open(). */ | |
064af421 BP |
76 | bool reliable; |
77 | ||
b3907fbc | 78 | struct list txq; /* Contains "struct ofpbuf"s. */ |
064af421 BP |
79 | |
80 | int backoff; | |
81 | int max_backoff; | |
82 | time_t backoff_deadline; | |
064af421 | 83 | time_t last_connected; |
2cdcb898 | 84 | time_t last_disconnected; |
064af421 BP |
85 | unsigned int packets_sent; |
86 | unsigned int seqno; | |
88a20d6e | 87 | int last_error; |
064af421 BP |
88 | |
89 | /* In S_ACTIVE and S_IDLE, probably_admitted reports whether we believe | |
90 | * that the peer has made a (positive) admission control decision on our | |
91 | * connection. If we have not yet been (probably) admitted, then the | |
92 | * connection does not reset the timer used for deciding whether the switch | |
93 | * should go into fail-open mode. | |
94 | * | |
95 | * last_admitted reports the last time we believe such a positive admission | |
96 | * control decision was made. */ | |
97 | bool probably_admitted; | |
98 | time_t last_admitted; | |
99 | ||
100 | /* These values are simply for statistics reporting, not used directly by | |
8cd4882f | 101 | * anything internal to the rconn (or ofproto for that matter). */ |
064af421 BP |
102 | unsigned int packets_received; |
103 | unsigned int n_attempted_connections, n_successful_connections; | |
104 | time_t creation_time; | |
105 | unsigned long int total_time_connected; | |
106 | ||
133f2dc9 BP |
107 | /* Throughout this file, "probe" is shorthand for "inactivity probe". When |
108 | * no activity has been observed from the peer for a while, we send out an | |
109 | * echo request as an inactivity probe packet. We should receive back a | |
110 | * response. | |
111 | * | |
112 | * "Activity" is defined as either receiving an OpenFlow message from the | |
113 | * peer or successfully sending a message that had been in 'txq'. */ | |
064af421 | 114 | int probe_interval; /* Secs of inactivity before sending probe. */ |
133f2dc9 | 115 | time_t last_activity; /* Last time we saw some activity. */ |
064af421 | 116 | |
19d1ab55 BP |
117 | /* When we create a vconn we obtain these values, to save them past the end |
118 | * of the vconn's lifetime. Otherwise, in-band control will only allow | |
119 | * traffic when a vconn is actually open, but it is nice to allow ARP to | |
120 | * complete even between connection attempts, and it is also polite to | |
121 | * allow traffic from other switches to go through to the controller | |
122 | * whether or not we are connected. | |
123 | * | |
124 | * We don't cache the local port, because that changes from one connection | |
125 | * attempt to the next. */ | |
d84d4b88 BP |
126 | ovs_be32 local_ip, remote_ip; |
127 | ovs_be16 remote_port; | |
f125905c | 128 | uint8_t dscp; |
19d1ab55 | 129 | |
064af421 BP |
130 | /* Messages sent or received are copied to the monitor connections. */ |
131 | #define MAX_MONITORS 8 | |
132 | struct vconn *monitors[8]; | |
133 | size_t n_monitors; | |
6042457b SH |
134 | |
135 | uint32_t allowed_versions; | |
064af421 BP |
136 | }; |
137 | ||
e182670b SH |
138 | uint32_t rconn_get_allowed_versions(const struct rconn *rconn) |
139 | { | |
140 | return rconn->allowed_versions; | |
141 | } | |
142 | ||
064af421 BP |
143 | static unsigned int elapsed_in_this_state(const struct rconn *); |
144 | static unsigned int timeout(const struct rconn *); | |
145 | static bool timed_out(const struct rconn *); | |
146 | static void state_transition(struct rconn *, enum state); | |
eb15cdbb BP |
147 | static void rconn_set_target__(struct rconn *, |
148 | const char *target, const char *name); | |
064af421 | 149 | static int try_send(struct rconn *); |
d4cbfb19 | 150 | static void reconnect(struct rconn *); |
b97ba90b | 151 | static void report_error(struct rconn *, int error); |
064af421 BP |
152 | static void disconnect(struct rconn *, int error); |
153 | static void flush_queue(struct rconn *); | |
064af421 BP |
154 | static void copy_to_monitor(struct rconn *, const struct ofpbuf *); |
155 | static bool is_connected_state(enum state); | |
156 | static bool is_admitted_msg(const struct ofpbuf *); | |
07c8c80d | 157 | static bool rconn_logging_connection_attempts__(const struct rconn *); |
064af421 | 158 | |
064af421 BP |
159 | /* Creates and returns a new rconn. |
160 | * | |
161 | * 'probe_interval' is a number of seconds. If the interval passes once | |
162 | * without an OpenFlow message being received from the peer, the rconn sends | |
163 | * out an "echo request" message. If the interval passes again without a | |
164 | * message being received, the rconn disconnects and re-connects to the peer. | |
165 | * Setting 'probe_interval' to 0 disables this behavior. | |
166 | * | |
167 | * 'max_backoff' is the maximum number of seconds between attempts to connect | |
168 | * to the peer. The actual interval starts at 1 second and doubles on each | |
169 | * failure until it reaches 'max_backoff'. If 0 is specified, the default of | |
9794e806 BP |
170 | * 8 seconds is used. |
171 | * | |
172 | * The new rconn is initially unconnected. Use rconn_connect() or | |
6042457b SH |
173 | * rconn_connect_unreliably() to connect it. |
174 | * | |
175 | * Connections made by the rconn will automatically negotiate an OpenFlow | |
176 | * protocol version acceptable to both peers on the connection. The version | |
177 | * negotiated will be one of those in the 'allowed_versions' bitmap: | |
178 | * version 'x' is allowed if allowed_versions & (1 << x) is nonzero. If | |
179 | * 'allowed_versions' is zero, then OFPUTIL_DEFAULT_VERSIONS are allowed. | |
180 | **/ | |
064af421 | 181 | struct rconn * |
6042457b SH |
182 | rconn_create(int probe_interval, int max_backoff, uint8_t dscp, |
183 | uint32_t allowed_versions) | |
064af421 | 184 | { |
ec6fde61 | 185 | struct rconn *rc = xzalloc(sizeof *rc); |
064af421 BP |
186 | |
187 | rc->state = S_VOID; | |
188 | rc->state_entered = time_now(); | |
189 | ||
190 | rc->vconn = NULL; | |
191 | rc->name = xstrdup("void"); | |
eb15cdbb | 192 | rc->target = xstrdup("void"); |
064af421 BP |
193 | rc->reliable = false; |
194 | ||
b3907fbc | 195 | list_init(&rc->txq); |
064af421 BP |
196 | |
197 | rc->backoff = 0; | |
c9aaa877 | 198 | rc->max_backoff = max_backoff ? max_backoff : 8; |
064af421 | 199 | rc->backoff_deadline = TIME_MIN; |
2cdcb898 AE |
200 | rc->last_connected = TIME_MIN; |
201 | rc->last_disconnected = TIME_MIN; | |
064af421 BP |
202 | rc->seqno = 0; |
203 | ||
204 | rc->packets_sent = 0; | |
205 | ||
206 | rc->probably_admitted = false; | |
207 | rc->last_admitted = time_now(); | |
208 | ||
209 | rc->packets_received = 0; | |
210 | rc->n_attempted_connections = 0; | |
211 | rc->n_successful_connections = 0; | |
212 | rc->creation_time = time_now(); | |
213 | rc->total_time_connected = 0; | |
214 | ||
133f2dc9 BP |
215 | rc->last_activity = time_now(); |
216 | ||
064af421 | 217 | rconn_set_probe_interval(rc, probe_interval); |
f125905c | 218 | rconn_set_dscp(rc, dscp); |
064af421 BP |
219 | |
220 | rc->n_monitors = 0; | |
6042457b SH |
221 | rc->allowed_versions = allowed_versions |
222 | ? allowed_versions | |
223 | : OFPUTIL_DEFAULT_VERSIONS; | |
064af421 BP |
224 | |
225 | return rc; | |
226 | } | |
227 | ||
228 | void | |
229 | rconn_set_max_backoff(struct rconn *rc, int max_backoff) | |
230 | { | |
231 | rc->max_backoff = MAX(1, max_backoff); | |
232 | if (rc->state == S_BACKOFF && rc->backoff > max_backoff) { | |
233 | rc->backoff = max_backoff; | |
234 | if (rc->backoff_deadline > time_now() + max_backoff) { | |
235 | rc->backoff_deadline = time_now() + max_backoff; | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
240 | int | |
241 | rconn_get_max_backoff(const struct rconn *rc) | |
242 | { | |
243 | return rc->max_backoff; | |
244 | } | |
245 | ||
f125905c MM |
246 | void |
247 | rconn_set_dscp(struct rconn *rc, uint8_t dscp) | |
248 | { | |
249 | rc->dscp = dscp; | |
250 | } | |
251 | ||
0442efd9 MM |
252 | uint8_t |
253 | rconn_get_dscp(const struct rconn *rc) | |
254 | { | |
255 | return rc->dscp; | |
256 | } | |
257 | ||
064af421 BP |
258 | void |
259 | rconn_set_probe_interval(struct rconn *rc, int probe_interval) | |
260 | { | |
261 | rc->probe_interval = probe_interval ? MAX(5, probe_interval) : 0; | |
262 | } | |
263 | ||
264 | int | |
265 | rconn_get_probe_interval(const struct rconn *rc) | |
266 | { | |
267 | return rc->probe_interval; | |
268 | } | |
269 | ||
eb15cdbb BP |
270 | /* Drops any existing connection on 'rc', then sets up 'rc' to connect to |
271 | * 'target' and reconnect as needed. 'target' should be a remote OpenFlow | |
272 | * target in a form acceptable to vconn_open(). | |
273 | * | |
274 | * If 'name' is nonnull, then it is used in log messages in place of 'target'. | |
275 | * It should presumably give more information to a human reader than 'target', | |
276 | * but it need not be acceptable to vconn_open(). */ | |
d4cbfb19 | 277 | void |
eb15cdbb | 278 | rconn_connect(struct rconn *rc, const char *target, const char *name) |
064af421 BP |
279 | { |
280 | rconn_disconnect(rc); | |
eb15cdbb | 281 | rconn_set_target__(rc, target, name); |
064af421 | 282 | rc->reliable = true; |
d4cbfb19 | 283 | reconnect(rc); |
064af421 BP |
284 | } |
285 | ||
eb15cdbb BP |
286 | /* Drops any existing connection on 'rc', then configures 'rc' to use |
287 | * 'vconn'. If the connection on 'vconn' drops, 'rc' will not reconnect on it | |
288 | * own. | |
289 | * | |
290 | * By default, the target obtained from vconn_get_name(vconn) is used in log | |
291 | * messages. If 'name' is nonnull, then it is used instead. It should | |
292 | * presumably give more information to a human reader than the target, but it | |
293 | * need not be acceptable to vconn_open(). */ | |
064af421 | 294 | void |
eb15cdbb BP |
295 | rconn_connect_unreliably(struct rconn *rc, |
296 | struct vconn *vconn, const char *name) | |
064af421 BP |
297 | { |
298 | assert(vconn != NULL); | |
299 | rconn_disconnect(rc); | |
eb15cdbb | 300 | rconn_set_target__(rc, vconn_get_name(vconn), name); |
064af421 BP |
301 | rc->reliable = false; |
302 | rc->vconn = vconn; | |
303 | rc->last_connected = time_now(); | |
304 | state_transition(rc, S_ACTIVE); | |
305 | } | |
306 | ||
307 | /* If 'rc' is connected, forces it to drop the connection and reconnect. */ | |
308 | void | |
309 | rconn_reconnect(struct rconn *rc) | |
310 | { | |
311 | if (rc->state & (S_ACTIVE | S_IDLE)) { | |
b97ba90b | 312 | VLOG_INFO("%s: disconnecting", rc->name); |
064af421 BP |
313 | disconnect(rc, 0); |
314 | } | |
315 | } | |
316 | ||
317 | void | |
318 | rconn_disconnect(struct rconn *rc) | |
319 | { | |
320 | if (rc->state != S_VOID) { | |
321 | if (rc->vconn) { | |
322 | vconn_close(rc->vconn); | |
323 | rc->vconn = NULL; | |
324 | } | |
eb15cdbb | 325 | rconn_set_target__(rc, "void", NULL); |
064af421 BP |
326 | rc->reliable = false; |
327 | ||
328 | rc->backoff = 0; | |
329 | rc->backoff_deadline = TIME_MIN; | |
330 | ||
331 | state_transition(rc, S_VOID); | |
332 | } | |
333 | } | |
334 | ||
335 | /* Disconnects 'rc' and frees the underlying storage. */ | |
336 | void | |
337 | rconn_destroy(struct rconn *rc) | |
338 | { | |
339 | if (rc) { | |
340 | size_t i; | |
341 | ||
342 | free(rc->name); | |
eb15cdbb | 343 | free(rc->target); |
064af421 BP |
344 | vconn_close(rc->vconn); |
345 | flush_queue(rc); | |
b3907fbc | 346 | ofpbuf_list_delete(&rc->txq); |
064af421 BP |
347 | for (i = 0; i < rc->n_monitors; i++) { |
348 | vconn_close(rc->monitors[i]); | |
349 | } | |
350 | free(rc); | |
351 | } | |
352 | } | |
353 | ||
354 | static unsigned int | |
67a4917b | 355 | timeout_VOID(const struct rconn *rc OVS_UNUSED) |
064af421 BP |
356 | { |
357 | return UINT_MAX; | |
358 | } | |
359 | ||
360 | static void | |
67a4917b | 361 | run_VOID(struct rconn *rc OVS_UNUSED) |
064af421 BP |
362 | { |
363 | /* Nothing to do. */ | |
364 | } | |
365 | ||
d4cbfb19 | 366 | static void |
064af421 BP |
367 | reconnect(struct rconn *rc) |
368 | { | |
369 | int retval; | |
370 | ||
07c8c80d BP |
371 | if (rconn_logging_connection_attempts__(rc)) { |
372 | VLOG_INFO("%s: connecting...", rc->name); | |
373 | } | |
064af421 | 374 | rc->n_attempted_connections++; |
6042457b SH |
375 | retval = vconn_open(rc->target, rc->allowed_versions, |
376 | &rc->vconn, rc->dscp); | |
064af421 | 377 | if (!retval) { |
19d1ab55 BP |
378 | rc->remote_ip = vconn_get_remote_ip(rc->vconn); |
379 | rc->local_ip = vconn_get_local_ip(rc->vconn); | |
380 | rc->remote_port = vconn_get_remote_port(rc->vconn); | |
064af421 BP |
381 | rc->backoff_deadline = time_now() + rc->backoff; |
382 | state_transition(rc, S_CONNECTING); | |
383 | } else { | |
384 | VLOG_WARN("%s: connection failed (%s)", rc->name, strerror(retval)); | |
385 | rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */ | |
88a20d6e | 386 | disconnect(rc, retval); |
064af421 | 387 | } |
064af421 BP |
388 | } |
389 | ||
390 | static unsigned int | |
391 | timeout_BACKOFF(const struct rconn *rc) | |
392 | { | |
393 | return rc->backoff; | |
394 | } | |
395 | ||
396 | static void | |
397 | run_BACKOFF(struct rconn *rc) | |
398 | { | |
399 | if (timed_out(rc)) { | |
400 | reconnect(rc); | |
401 | } | |
402 | } | |
403 | ||
404 | static unsigned int | |
405 | timeout_CONNECTING(const struct rconn *rc) | |
406 | { | |
407 | return MAX(1, rc->backoff); | |
408 | } | |
409 | ||
410 | static void | |
411 | run_CONNECTING(struct rconn *rc) | |
412 | { | |
413 | int retval = vconn_connect(rc->vconn); | |
414 | if (!retval) { | |
415 | VLOG_INFO("%s: connected", rc->name); | |
416 | rc->n_successful_connections++; | |
417 | state_transition(rc, S_ACTIVE); | |
418 | rc->last_connected = rc->state_entered; | |
419 | } else if (retval != EAGAIN) { | |
07c8c80d BP |
420 | if (rconn_logging_connection_attempts__(rc)) { |
421 | VLOG_INFO("%s: connection failed (%s)", | |
422 | rc->name, strerror(retval)); | |
423 | } | |
064af421 BP |
424 | disconnect(rc, retval); |
425 | } else if (timed_out(rc)) { | |
07c8c80d BP |
426 | if (rconn_logging_connection_attempts__(rc)) { |
427 | VLOG_INFO("%s: connection timed out", rc->name); | |
428 | } | |
064af421 | 429 | rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */ |
88a20d6e | 430 | disconnect(rc, ETIMEDOUT); |
064af421 BP |
431 | } |
432 | } | |
433 | ||
434 | static void | |
435 | do_tx_work(struct rconn *rc) | |
436 | { | |
b3907fbc | 437 | if (list_is_empty(&rc->txq)) { |
064af421 BP |
438 | return; |
439 | } | |
b3907fbc | 440 | while (!list_is_empty(&rc->txq)) { |
064af421 BP |
441 | int error = try_send(rc); |
442 | if (error) { | |
443 | break; | |
444 | } | |
133f2dc9 | 445 | rc->last_activity = time_now(); |
064af421 | 446 | } |
b3907fbc | 447 | if (list_is_empty(&rc->txq)) { |
064af421 BP |
448 | poll_immediate_wake(); |
449 | } | |
450 | } | |
451 | ||
452 | static unsigned int | |
453 | timeout_ACTIVE(const struct rconn *rc) | |
454 | { | |
455 | if (rc->probe_interval) { | |
133f2dc9 | 456 | unsigned int base = MAX(rc->last_activity, rc->state_entered); |
064af421 BP |
457 | unsigned int arg = base + rc->probe_interval - rc->state_entered; |
458 | return arg; | |
459 | } | |
460 | return UINT_MAX; | |
461 | } | |
462 | ||
463 | static void | |
464 | run_ACTIVE(struct rconn *rc) | |
465 | { | |
466 | if (timed_out(rc)) { | |
133f2dc9 | 467 | unsigned int base = MAX(rc->last_activity, rc->state_entered); |
1a126c0c SH |
468 | int version; |
469 | ||
064af421 BP |
470 | VLOG_DBG("%s: idle %u seconds, sending inactivity probe", |
471 | rc->name, (unsigned int) (time_now() - base)); | |
472 | ||
1a126c0c SH |
473 | version = rconn_get_version(rc); |
474 | assert(version >= 0 && version <= 0xff); | |
475 | ||
064af421 BP |
476 | /* Ordering is important here: rconn_send() can transition to BACKOFF, |
477 | * and we don't want to transition back to IDLE if so, because then we | |
478 | * can end up queuing a packet with vconn == NULL and then *boom*. */ | |
479 | state_transition(rc, S_IDLE); | |
1a126c0c | 480 | rconn_send(rc, make_echo_request(version), NULL); |
064af421 BP |
481 | return; |
482 | } | |
483 | ||
484 | do_tx_work(rc); | |
485 | } | |
486 | ||
487 | static unsigned int | |
488 | timeout_IDLE(const struct rconn *rc) | |
489 | { | |
490 | return rc->probe_interval; | |
491 | } | |
492 | ||
493 | static void | |
494 | run_IDLE(struct rconn *rc) | |
495 | { | |
496 | if (timed_out(rc)) { | |
064af421 BP |
497 | VLOG_ERR("%s: no response to inactivity probe after %u " |
498 | "seconds, disconnecting", | |
499 | rc->name, elapsed_in_this_state(rc)); | |
88a20d6e | 500 | disconnect(rc, ETIMEDOUT); |
064af421 BP |
501 | } else { |
502 | do_tx_work(rc); | |
503 | } | |
504 | } | |
505 | ||
506 | /* Performs whatever activities are necessary to maintain 'rc': if 'rc' is | |
507 | * disconnected, attempts to (re)connect, backing off as necessary; if 'rc' is | |
508 | * connected, attempts to send packets in the send queue, if any. */ | |
509 | void | |
510 | rconn_run(struct rconn *rc) | |
511 | { | |
512 | int old_state; | |
60cb3eb8 BP |
513 | size_t i; |
514 | ||
515 | if (rc->vconn) { | |
516 | vconn_run(rc->vconn); | |
517 | } | |
518 | for (i = 0; i < rc->n_monitors; i++) { | |
519 | vconn_run(rc->monitors[i]); | |
520 | } | |
521 | ||
064af421 BP |
522 | do { |
523 | old_state = rc->state; | |
524 | switch (rc->state) { | |
525 | #define STATE(NAME, VALUE) case S_##NAME: run_##NAME(rc); break; | |
526 | STATES | |
527 | #undef STATE | |
528 | default: | |
529 | NOT_REACHED(); | |
530 | } | |
531 | } while (rc->state != old_state); | |
532 | } | |
533 | ||
534 | /* Causes the next call to poll_block() to wake up when rconn_run() should be | |
535 | * called on 'rc'. */ | |
536 | void | |
537 | rconn_run_wait(struct rconn *rc) | |
538 | { | |
60cb3eb8 BP |
539 | unsigned int timeo; |
540 | size_t i; | |
541 | ||
542 | if (rc->vconn) { | |
543 | vconn_run_wait(rc->vconn); | |
82c2b79d BP |
544 | if ((rc->state & (S_ACTIVE | S_IDLE)) && !list_is_empty(&rc->txq)) { |
545 | vconn_wait(rc->vconn, WAIT_SEND); | |
546 | } | |
60cb3eb8 BP |
547 | } |
548 | for (i = 0; i < rc->n_monitors; i++) { | |
549 | vconn_run_wait(rc->monitors[i]); | |
550 | } | |
551 | ||
552 | timeo = timeout(rc); | |
064af421 | 553 | if (timeo != UINT_MAX) { |
7cf8b266 BP |
554 | long long int expires = sat_add(rc->state_entered, timeo); |
555 | poll_timer_wait_until(expires * 1000); | |
064af421 | 556 | } |
064af421 BP |
557 | } |
558 | ||
559 | /* Attempts to receive a packet from 'rc'. If successful, returns the packet; | |
560 | * otherwise, returns a null pointer. The caller is responsible for freeing | |
561 | * the packet (with ofpbuf_delete()). */ | |
562 | struct ofpbuf * | |
563 | rconn_recv(struct rconn *rc) | |
564 | { | |
565 | if (rc->state & (S_ACTIVE | S_IDLE)) { | |
566 | struct ofpbuf *buffer; | |
567 | int error = vconn_recv(rc->vconn, &buffer); | |
568 | if (!error) { | |
569 | copy_to_monitor(rc, buffer); | |
7778bd15 | 570 | if (rc->probably_admitted || is_admitted_msg(buffer) |
064af421 BP |
571 | || time_now() - rc->last_connected >= 30) { |
572 | rc->probably_admitted = true; | |
573 | rc->last_admitted = time_now(); | |
574 | } | |
133f2dc9 | 575 | rc->last_activity = time_now(); |
064af421 BP |
576 | rc->packets_received++; |
577 | if (rc->state == S_IDLE) { | |
578 | state_transition(rc, S_ACTIVE); | |
579 | } | |
580 | return buffer; | |
581 | } else if (error != EAGAIN) { | |
b97ba90b | 582 | report_error(rc, error); |
064af421 BP |
583 | disconnect(rc, error); |
584 | } | |
585 | } | |
586 | return NULL; | |
587 | } | |
588 | ||
589 | /* Causes the next call to poll_block() to wake up when a packet may be ready | |
590 | * to be received by vconn_recv() on 'rc'. */ | |
591 | void | |
592 | rconn_recv_wait(struct rconn *rc) | |
593 | { | |
594 | if (rc->vconn) { | |
595 | vconn_wait(rc->vconn, WAIT_RECV); | |
596 | } | |
597 | } | |
598 | ||
acb9da40 EJ |
599 | /* Sends 'b' on 'rc'. Returns 0 if successful, or ENOTCONN if 'rc' is not |
600 | * currently connected. Takes ownership of 'b'. | |
064af421 BP |
601 | * |
602 | * If 'counter' is non-null, then 'counter' will be incremented while the | |
603 | * packet is in flight, then decremented when it has been sent (or discarded | |
604 | * due to disconnection). Because 'b' may be sent (or discarded) before this | |
605 | * function returns, the caller may not be able to observe any change in | |
606 | * 'counter'. | |
607 | * | |
608 | * There is no rconn_send_wait() function: an rconn has a send queue that it | |
609 | * takes care of sending if you call rconn_run(), which will have the side | |
610 | * effect of waking up poll_block(). */ | |
611 | int | |
612 | rconn_send(struct rconn *rc, struct ofpbuf *b, | |
613 | struct rconn_packet_counter *counter) | |
614 | { | |
615 | if (rconn_is_connected(rc)) { | |
616 | COVERAGE_INC(rconn_queued); | |
617 | copy_to_monitor(rc, b); | |
d45e9c65 | 618 | b->private_p = counter; |
064af421 | 619 | if (counter) { |
a6441685 | 620 | rconn_packet_counter_inc(counter, b->size); |
064af421 | 621 | } |
b3907fbc | 622 | list_push_back(&rc->txq, &b->list_node); |
064af421 BP |
623 | |
624 | /* If the queue was empty before we added 'b', try to send some | |
625 | * packets. (But if the queue had packets in it, it's because the | |
626 | * vconn is backlogged and there's no point in stuffing more into it | |
627 | * now. We'll get back to that in rconn_run().) */ | |
b3907fbc | 628 | if (rc->txq.next == &b->list_node) { |
064af421 BP |
629 | try_send(rc); |
630 | } | |
631 | return 0; | |
632 | } else { | |
acb9da40 | 633 | ofpbuf_delete(b); |
064af421 BP |
634 | return ENOTCONN; |
635 | } | |
636 | } | |
637 | ||
638 | /* Sends 'b' on 'rc'. Increments 'counter' while the packet is in flight; it | |
639 | * will be decremented when it has been sent (or discarded due to | |
640 | * disconnection). Returns 0 if successful, EAGAIN if 'counter->n' is already | |
641 | * at least as large as 'queue_limit', or ENOTCONN if 'rc' is not currently | |
642 | * connected. Regardless of return value, 'b' is destroyed. | |
643 | * | |
644 | * Because 'b' may be sent (or discarded) before this function returns, the | |
645 | * caller may not be able to observe any change in 'counter'. | |
646 | * | |
647 | * There is no rconn_send_wait() function: an rconn has a send queue that it | |
648 | * takes care of sending if you call rconn_run(), which will have the side | |
649 | * effect of waking up poll_block(). */ | |
650 | int | |
651 | rconn_send_with_limit(struct rconn *rc, struct ofpbuf *b, | |
652 | struct rconn_packet_counter *counter, int queue_limit) | |
653 | { | |
654 | int retval; | |
a6441685 BP |
655 | retval = (counter->n_packets >= queue_limit |
656 | ? EAGAIN | |
657 | : rconn_send(rc, b, counter)); | |
064af421 BP |
658 | if (retval) { |
659 | COVERAGE_INC(rconn_overflow); | |
064af421 BP |
660 | } |
661 | return retval; | |
662 | } | |
663 | ||
664 | /* Returns the total number of packets successfully sent on the underlying | |
665 | * vconn. A packet is not counted as sent while it is still queued in the | |
666 | * rconn, only when it has been successfuly passed to the vconn. */ | |
667 | unsigned int | |
668 | rconn_packets_sent(const struct rconn *rc) | |
669 | { | |
670 | return rc->packets_sent; | |
671 | } | |
672 | ||
673 | /* Adds 'vconn' to 'rc' as a monitoring connection, to which all messages sent | |
674 | * and received on 'rconn' will be copied. 'rc' takes ownership of 'vconn'. */ | |
675 | void | |
676 | rconn_add_monitor(struct rconn *rc, struct vconn *vconn) | |
677 | { | |
678 | if (rc->n_monitors < ARRAY_SIZE(rc->monitors)) { | |
e182670b SH |
679 | int version = vconn_get_version(rc->vconn); |
680 | ||
681 | /* Override the allowed versions of the snoop vconn so that | |
682 | * only the version of the controller connection is allowed. | |
683 | * This is because the snoop will see the same messages as the | |
684 | * controller */ | |
685 | vconn_set_allowed_versions(vconn, 1u << version); | |
686 | ||
064af421 BP |
687 | VLOG_INFO("new monitor connection from %s", vconn_get_name(vconn)); |
688 | rc->monitors[rc->n_monitors++] = vconn; | |
689 | } else { | |
690 | VLOG_DBG("too many monitor connections, discarding %s", | |
691 | vconn_get_name(vconn)); | |
692 | vconn_close(vconn); | |
693 | } | |
694 | } | |
695 | ||
eb15cdbb BP |
696 | /* Returns 'rc''s name. This is a name for human consumption, appropriate for |
697 | * use in log messages. It is not necessarily a name that may be passed | |
698 | * directly to, e.g., vconn_open(). */ | |
064af421 BP |
699 | const char * |
700 | rconn_get_name(const struct rconn *rc) | |
701 | { | |
702 | return rc->name; | |
703 | } | |
704 | ||
eb15cdbb BP |
705 | /* Sets 'rc''s name to 'new_name'. */ |
706 | void | |
707 | rconn_set_name(struct rconn *rc, const char *new_name) | |
708 | { | |
709 | free(rc->name); | |
710 | rc->name = xstrdup(new_name); | |
711 | } | |
712 | ||
713 | /* Returns 'rc''s target. This is intended to be a string that may be passed | |
714 | * directly to, e.g., vconn_open(). */ | |
715 | const char * | |
716 | rconn_get_target(const struct rconn *rc) | |
717 | { | |
718 | return rc->target; | |
719 | } | |
720 | ||
064af421 BP |
721 | /* Returns true if 'rconn' is connected or in the process of reconnecting, |
722 | * false if 'rconn' is disconnected and will not reconnect on its own. */ | |
723 | bool | |
724 | rconn_is_alive(const struct rconn *rconn) | |
725 | { | |
726 | return rconn->state != S_VOID; | |
727 | } | |
728 | ||
729 | /* Returns true if 'rconn' is connected, false otherwise. */ | |
730 | bool | |
731 | rconn_is_connected(const struct rconn *rconn) | |
732 | { | |
733 | return is_connected_state(rconn->state); | |
734 | } | |
735 | ||
7778bd15 BP |
736 | /* Returns true if 'rconn' is connected and thought to have been accepted by |
737 | * the peer's admission-control policy. */ | |
738 | bool | |
739 | rconn_is_admitted(const struct rconn *rconn) | |
740 | { | |
741 | return (rconn_is_connected(rconn) | |
742 | && rconn->last_admitted >= rconn->last_connected); | |
743 | } | |
744 | ||
745 | /* Returns 0 if 'rconn' is currently connected and considered to have been | |
746 | * accepted by the peer's admission-control policy, otherwise the number of | |
747 | * seconds since 'rconn' was last in such a state. */ | |
064af421 BP |
748 | int |
749 | rconn_failure_duration(const struct rconn *rconn) | |
750 | { | |
7778bd15 | 751 | return rconn_is_admitted(rconn) ? 0 : time_now() - rconn->last_admitted; |
064af421 BP |
752 | } |
753 | ||
19d1ab55 BP |
754 | /* Returns the IP address of the peer, or 0 if the peer's IP address is not |
755 | * known. */ | |
dbba996b | 756 | ovs_be32 |
d295e8e9 | 757 | rconn_get_remote_ip(const struct rconn *rconn) |
064af421 | 758 | { |
19d1ab55 | 759 | return rconn->remote_ip; |
193456d5 JP |
760 | } |
761 | ||
19d1ab55 BP |
762 | /* Returns the transport port of the peer, or 0 if the peer's port is not |
763 | * known. */ | |
dbba996b | 764 | ovs_be16 |
d295e8e9 | 765 | rconn_get_remote_port(const struct rconn *rconn) |
193456d5 | 766 | { |
19d1ab55 | 767 | return rconn->remote_port; |
193456d5 JP |
768 | } |
769 | ||
770 | /* Returns the IP address used to connect to the peer, or 0 if the | |
d295e8e9 | 771 | * connection is not an IP-based protocol or if its IP address is not |
193456d5 | 772 | * known. */ |
dbba996b | 773 | ovs_be32 |
d295e8e9 | 774 | rconn_get_local_ip(const struct rconn *rconn) |
193456d5 | 775 | { |
19d1ab55 | 776 | return rconn->local_ip; |
193456d5 JP |
777 | } |
778 | ||
779 | /* Returns the transport port used to connect to the peer, or 0 if the | |
780 | * connection does not contain a port or if the port is not known. */ | |
dbba996b | 781 | ovs_be16 |
d295e8e9 | 782 | rconn_get_local_port(const struct rconn *rconn) |
193456d5 JP |
783 | { |
784 | return rconn->vconn ? vconn_get_local_port(rconn->vconn) : 0; | |
064af421 BP |
785 | } |
786 | ||
27527aa0 BP |
787 | /* Returns the OpenFlow version negotiated with the peer, or -1 if there is |
788 | * currently no connection or if version negotiation is not yet complete. */ | |
789 | int | |
790 | rconn_get_version(const struct rconn *rconn) | |
791 | { | |
792 | return rconn->vconn ? vconn_get_version(rconn->vconn) : -1; | |
793 | } | |
794 | ||
064af421 BP |
795 | /* Returns the total number of packets successfully received by the underlying |
796 | * vconn. */ | |
797 | unsigned int | |
798 | rconn_packets_received(const struct rconn *rc) | |
799 | { | |
800 | return rc->packets_received; | |
801 | } | |
802 | ||
803 | /* Returns a string representing the internal state of 'rc'. The caller must | |
804 | * not modify or free the string. */ | |
805 | const char * | |
806 | rconn_get_state(const struct rconn *rc) | |
807 | { | |
808 | return state_name(rc->state); | |
809 | } | |
810 | ||
064af421 | 811 | /* Returns the time at which the last successful connection was made by |
2cdcb898 | 812 | * 'rc'. Returns TIME_MIN if never connected. */ |
064af421 BP |
813 | time_t |
814 | rconn_get_last_connection(const struct rconn *rc) | |
815 | { | |
816 | return rc->last_connected; | |
817 | } | |
818 | ||
2cdcb898 AE |
819 | /* Returns the time at which 'rc' was last disconnected. Returns TIME_MIN |
820 | * if never disconnected. */ | |
821 | time_t | |
822 | rconn_get_last_disconnect(const struct rconn *rc) | |
823 | { | |
824 | return rc->last_disconnected; | |
825 | } | |
826 | ||
064af421 BP |
827 | /* Returns 'rc''s current connection sequence number, a number that changes |
828 | * every time that 'rconn' connects or disconnects. */ | |
829 | unsigned int | |
830 | rconn_get_connection_seqno(const struct rconn *rc) | |
831 | { | |
832 | return rc->seqno; | |
833 | } | |
88a20d6e BP |
834 | |
835 | /* Returns a value that explains why 'rc' last disconnected: | |
836 | * | |
837 | * - 0 means that the last disconnection was caused by a call to | |
838 | * rconn_disconnect(), or that 'rc' is new and has not yet completed its | |
839 | * initial connection or connection attempt. | |
840 | * | |
841 | * - EOF means that the connection was closed in the normal way by the peer. | |
842 | * | |
843 | * - A positive integer is an errno value that represents the error. | |
844 | */ | |
845 | int | |
846 | rconn_get_last_error(const struct rconn *rc) | |
847 | { | |
848 | return rc->last_error; | |
849 | } | |
0d085684 BP |
850 | |
851 | /* Returns the number of messages queued for transmission on 'rc'. */ | |
852 | unsigned int | |
853 | rconn_count_txqlen(const struct rconn *rc) | |
854 | { | |
855 | return list_size(&rc->txq); | |
856 | } | |
064af421 BP |
857 | \f |
858 | struct rconn_packet_counter * | |
859 | rconn_packet_counter_create(void) | |
860 | { | |
a6441685 | 861 | struct rconn_packet_counter *c = xzalloc(sizeof *c); |
064af421 BP |
862 | c->ref_cnt = 1; |
863 | return c; | |
864 | } | |
865 | ||
866 | void | |
867 | rconn_packet_counter_destroy(struct rconn_packet_counter *c) | |
868 | { | |
869 | if (c) { | |
870 | assert(c->ref_cnt > 0); | |
a6441685 | 871 | if (!--c->ref_cnt && !c->n_packets) { |
064af421 BP |
872 | free(c); |
873 | } | |
874 | } | |
875 | } | |
876 | ||
877 | void | |
a6441685 | 878 | rconn_packet_counter_inc(struct rconn_packet_counter *c, unsigned int n_bytes) |
064af421 | 879 | { |
a6441685 BP |
880 | c->n_packets++; |
881 | c->n_bytes += n_bytes; | |
064af421 BP |
882 | } |
883 | ||
884 | void | |
a6441685 | 885 | rconn_packet_counter_dec(struct rconn_packet_counter *c, unsigned int n_bytes) |
064af421 | 886 | { |
a6441685 BP |
887 | assert(c->n_packets > 0); |
888 | assert(c->n_bytes >= n_bytes); | |
889 | ||
890 | c->n_bytes -= n_bytes; | |
891 | c->n_packets--; | |
892 | if (!c->n_packets) { | |
893 | assert(!c->n_bytes); | |
894 | if (!c->ref_cnt) { | |
895 | free(c); | |
896 | } | |
064af421 BP |
897 | } |
898 | } | |
899 | \f | |
eb15cdbb BP |
900 | /* Set rc->target and rc->name to 'target' and 'name', respectively. If 'name' |
901 | * is null, 'target' is used. | |
902 | * | |
903 | * Also, clear out the cached IP address and port information, since changing | |
904 | * the target also likely changes these values. */ | |
19d1ab55 | 905 | static void |
eb15cdbb | 906 | rconn_set_target__(struct rconn *rc, const char *target, const char *name) |
19d1ab55 BP |
907 | { |
908 | free(rc->name); | |
eb15cdbb BP |
909 | rc->name = xstrdup(name ? name : target); |
910 | free(rc->target); | |
911 | rc->target = xstrdup(target); | |
19d1ab55 BP |
912 | rc->local_ip = 0; |
913 | rc->remote_ip = 0; | |
914 | rc->remote_port = 0; | |
915 | } | |
916 | ||
064af421 BP |
917 | /* Tries to send a packet from 'rc''s send buffer. Returns 0 if successful, |
918 | * otherwise a positive errno value. */ | |
919 | static int | |
920 | try_send(struct rconn *rc) | |
921 | { | |
b3907fbc | 922 | struct ofpbuf *msg = ofpbuf_from_list(rc->txq.next); |
a6441685 | 923 | unsigned int n_bytes = msg->size; |
b3907fbc BP |
924 | struct rconn_packet_counter *counter = msg->private_p; |
925 | int retval; | |
926 | ||
927 | /* Eagerly remove 'msg' from the txq. We can't remove it from the list | |
928 | * after sending, if sending is successful, because it is then owned by the | |
929 | * vconn, which might have freed it already. */ | |
930 | list_remove(&msg->list_node); | |
931 | ||
932 | retval = vconn_send(rc->vconn, msg); | |
064af421 | 933 | if (retval) { |
b3907fbc | 934 | list_push_front(&rc->txq, &msg->list_node); |
064af421 | 935 | if (retval != EAGAIN) { |
b97ba90b | 936 | report_error(rc, retval); |
064af421 BP |
937 | disconnect(rc, retval); |
938 | } | |
939 | return retval; | |
940 | } | |
941 | COVERAGE_INC(rconn_sent); | |
942 | rc->packets_sent++; | |
943 | if (counter) { | |
a6441685 | 944 | rconn_packet_counter_dec(counter, n_bytes); |
064af421 | 945 | } |
064af421 BP |
946 | return 0; |
947 | } | |
948 | ||
b97ba90b BP |
949 | /* Reports that 'error' caused 'rc' to disconnect. 'error' may be a positive |
950 | * errno value, or it may be EOF to indicate that the connection was closed | |
951 | * normally. */ | |
064af421 | 952 | static void |
b97ba90b BP |
953 | report_error(struct rconn *rc, int error) |
954 | { | |
955 | if (error == EOF) { | |
956 | /* If 'rc' isn't reliable, then we don't really expect this connection | |
957 | * to last forever anyway (probably it's a connection that we received | |
958 | * via accept()), so use DBG level to avoid cluttering the logs. */ | |
959 | enum vlog_level level = rc->reliable ? VLL_INFO : VLL_DBG; | |
960 | VLOG(level, "%s: connection closed by peer", rc->name); | |
961 | } else { | |
962 | VLOG_WARN("%s: connection dropped (%s)", rc->name, strerror(error)); | |
963 | } | |
964 | } | |
965 | ||
88a20d6e BP |
966 | /* Disconnects 'rc' and records 'error' as the error that caused 'rc''s last |
967 | * disconnection: | |
968 | * | |
969 | * - 0 means that this disconnection is due to a request by 'rc''s client, | |
970 | * not due to any kind of network error. | |
971 | * | |
972 | * - EOF means that the connection was closed in the normal way by the peer. | |
973 | * | |
974 | * - A positive integer is an errno value that represents the error. | |
975 | */ | |
064af421 BP |
976 | static void |
977 | disconnect(struct rconn *rc, int error) | |
978 | { | |
88a20d6e | 979 | rc->last_error = error; |
064af421 BP |
980 | if (rc->reliable) { |
981 | time_t now = time_now(); | |
982 | ||
983 | if (rc->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) { | |
2cdcb898 | 984 | rc->last_disconnected = now; |
064af421 BP |
985 | vconn_close(rc->vconn); |
986 | rc->vconn = NULL; | |
987 | flush_queue(rc); | |
988 | } | |
989 | ||
990 | if (now >= rc->backoff_deadline) { | |
991 | rc->backoff = 1; | |
07c8c80d BP |
992 | } else if (rc->backoff < rc->max_backoff / 2) { |
993 | rc->backoff = MAX(1, 2 * rc->backoff); | |
46816c34 | 994 | VLOG_INFO("%s: waiting %d seconds before reconnect", |
064af421 | 995 | rc->name, rc->backoff); |
07c8c80d BP |
996 | } else { |
997 | if (rconn_logging_connection_attempts__(rc)) { | |
998 | VLOG_INFO("%s: continuing to retry connections in the " | |
999 | "background but suppressing further logging", | |
1000 | rc->name); | |
1001 | } | |
1002 | rc->backoff = rc->max_backoff; | |
064af421 BP |
1003 | } |
1004 | rc->backoff_deadline = now + rc->backoff; | |
1005 | state_transition(rc, S_BACKOFF); | |
064af421 | 1006 | } else { |
2cdcb898 | 1007 | rc->last_disconnected = time_now(); |
064af421 BP |
1008 | rconn_disconnect(rc); |
1009 | } | |
1010 | } | |
1011 | ||
1012 | /* Drops all the packets from 'rc''s send queue and decrements their queue | |
1013 | * counts. */ | |
1014 | static void | |
1015 | flush_queue(struct rconn *rc) | |
1016 | { | |
b3907fbc | 1017 | if (list_is_empty(&rc->txq)) { |
064af421 BP |
1018 | return; |
1019 | } | |
b3907fbc BP |
1020 | while (!list_is_empty(&rc->txq)) { |
1021 | struct ofpbuf *b = ofpbuf_from_list(list_pop_front(&rc->txq)); | |
d45e9c65 | 1022 | struct rconn_packet_counter *counter = b->private_p; |
064af421 | 1023 | if (counter) { |
a6441685 | 1024 | rconn_packet_counter_dec(counter, b->size); |
064af421 BP |
1025 | } |
1026 | COVERAGE_INC(rconn_discarded); | |
1027 | ofpbuf_delete(b); | |
1028 | } | |
1029 | poll_immediate_wake(); | |
1030 | } | |
1031 | ||
1032 | static unsigned int | |
1033 | elapsed_in_this_state(const struct rconn *rc) | |
1034 | { | |
1035 | return time_now() - rc->state_entered; | |
1036 | } | |
1037 | ||
1038 | static unsigned int | |
1039 | timeout(const struct rconn *rc) | |
1040 | { | |
1041 | switch (rc->state) { | |
1042 | #define STATE(NAME, VALUE) case S_##NAME: return timeout_##NAME(rc); | |
1043 | STATES | |
1044 | #undef STATE | |
1045 | default: | |
1046 | NOT_REACHED(); | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | static bool | |
1051 | timed_out(const struct rconn *rc) | |
1052 | { | |
1053 | return time_now() >= sat_add(rc->state_entered, timeout(rc)); | |
1054 | } | |
1055 | ||
1056 | static void | |
1057 | state_transition(struct rconn *rc, enum state state) | |
1058 | { | |
1059 | rc->seqno += (rc->state == S_ACTIVE) != (state == S_ACTIVE); | |
1060 | if (is_connected_state(state) && !is_connected_state(rc->state)) { | |
1061 | rc->probably_admitted = false; | |
1062 | } | |
1063 | if (rconn_is_connected(rc)) { | |
1064 | rc->total_time_connected += elapsed_in_this_state(rc); | |
1065 | } | |
1066 | VLOG_DBG("%s: entering %s", rc->name, state_name(state)); | |
1067 | rc->state = state; | |
1068 | rc->state_entered = time_now(); | |
1069 | } | |
1070 | ||
064af421 BP |
1071 | static void |
1072 | copy_to_monitor(struct rconn *rc, const struct ofpbuf *b) | |
1073 | { | |
1074 | struct ofpbuf *clone = NULL; | |
1075 | int retval; | |
1076 | size_t i; | |
1077 | ||
1078 | for (i = 0; i < rc->n_monitors; ) { | |
1079 | struct vconn *vconn = rc->monitors[i]; | |
1080 | ||
1081 | if (!clone) { | |
1082 | clone = ofpbuf_clone(b); | |
1083 | } | |
1084 | retval = vconn_send(vconn, clone); | |
1085 | if (!retval) { | |
1086 | clone = NULL; | |
1087 | } else if (retval != EAGAIN) { | |
1088 | VLOG_DBG("%s: closing monitor connection to %s: %s", | |
1089 | rconn_get_name(rc), vconn_get_name(vconn), | |
1090 | strerror(retval)); | |
1091 | rc->monitors[i] = rc->monitors[--rc->n_monitors]; | |
1092 | continue; | |
1093 | } | |
1094 | i++; | |
1095 | } | |
1096 | ofpbuf_delete(clone); | |
1097 | } | |
1098 | ||
1099 | static bool | |
d295e8e9 | 1100 | is_connected_state(enum state state) |
064af421 BP |
1101 | { |
1102 | return (state & (S_ACTIVE | S_IDLE)) != 0; | |
1103 | } | |
1104 | ||
1105 | static bool | |
1106 | is_admitted_msg(const struct ofpbuf *b) | |
1107 | { | |
982697a4 BP |
1108 | enum ofptype type; |
1109 | enum ofperr error; | |
1110 | ||
1111 | error = ofptype_decode(&type, b->data); | |
1112 | if (error) { | |
1113 | return false; | |
1114 | } | |
1115 | ||
1116 | switch (type) { | |
1117 | case OFPTYPE_HELLO: | |
1118 | case OFPTYPE_ERROR: | |
1119 | case OFPTYPE_ECHO_REQUEST: | |
1120 | case OFPTYPE_ECHO_REPLY: | |
1121 | case OFPTYPE_FEATURES_REQUEST: | |
1122 | case OFPTYPE_FEATURES_REPLY: | |
1123 | case OFPTYPE_GET_CONFIG_REQUEST: | |
1124 | case OFPTYPE_GET_CONFIG_REPLY: | |
1125 | case OFPTYPE_SET_CONFIG: | |
1126 | return false; | |
1127 | ||
1128 | case OFPTYPE_PACKET_IN: | |
1129 | case OFPTYPE_FLOW_REMOVED: | |
1130 | case OFPTYPE_PORT_STATUS: | |
1131 | case OFPTYPE_PACKET_OUT: | |
1132 | case OFPTYPE_FLOW_MOD: | |
1133 | case OFPTYPE_PORT_MOD: | |
1134 | case OFPTYPE_BARRIER_REQUEST: | |
1135 | case OFPTYPE_BARRIER_REPLY: | |
1136 | case OFPTYPE_DESC_STATS_REQUEST: | |
1137 | case OFPTYPE_DESC_STATS_REPLY: | |
1138 | case OFPTYPE_FLOW_STATS_REQUEST: | |
1139 | case OFPTYPE_FLOW_STATS_REPLY: | |
1140 | case OFPTYPE_AGGREGATE_STATS_REQUEST: | |
1141 | case OFPTYPE_AGGREGATE_STATS_REPLY: | |
1142 | case OFPTYPE_TABLE_STATS_REQUEST: | |
1143 | case OFPTYPE_TABLE_STATS_REPLY: | |
1144 | case OFPTYPE_PORT_STATS_REQUEST: | |
1145 | case OFPTYPE_PORT_STATS_REPLY: | |
1146 | case OFPTYPE_QUEUE_STATS_REQUEST: | |
1147 | case OFPTYPE_QUEUE_STATS_REPLY: | |
1148 | case OFPTYPE_PORT_DESC_STATS_REQUEST: | |
1149 | case OFPTYPE_PORT_DESC_STATS_REPLY: | |
1150 | case OFPTYPE_ROLE_REQUEST: | |
1151 | case OFPTYPE_ROLE_REPLY: | |
1152 | case OFPTYPE_SET_FLOW_FORMAT: | |
1153 | case OFPTYPE_FLOW_MOD_TABLE_ID: | |
1154 | case OFPTYPE_SET_PACKET_IN_FORMAT: | |
1155 | case OFPTYPE_FLOW_AGE: | |
1156 | case OFPTYPE_SET_ASYNC_CONFIG: | |
1157 | case OFPTYPE_SET_CONTROLLER_ID: | |
1158 | case OFPTYPE_FLOW_MONITOR_STATS_REQUEST: | |
1159 | case OFPTYPE_FLOW_MONITOR_STATS_REPLY: | |
1160 | case OFPTYPE_FLOW_MONITOR_CANCEL: | |
1161 | case OFPTYPE_FLOW_MONITOR_PAUSED: | |
1162 | case OFPTYPE_FLOW_MONITOR_RESUMED: | |
1163 | default: | |
1164 | return true; | |
1165 | } | |
064af421 | 1166 | } |
07c8c80d BP |
1167 | |
1168 | /* Returns true if 'rc' is currently logging information about connection | |
1169 | * attempts, false if logging should be suppressed because 'rc' hasn't | |
1170 | * successuflly connected in too long. */ | |
1171 | static bool | |
1172 | rconn_logging_connection_attempts__(const struct rconn *rc) | |
1173 | { | |
1174 | return rc->backoff < rc->max_backoff; | |
1175 | } |