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19a87e36 BP |
1 | /* |
2 | * Copyright (c) 2009, 2010, 2011 Nicira Networks. | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | ||
19 | #include "connmgr.h" | |
20 | ||
21 | #include <errno.h> | |
22 | #include <stdlib.h> | |
23 | ||
24 | #include "coverage.h" | |
19a87e36 BP |
25 | #include "fail-open.h" |
26 | #include "in-band.h" | |
27 | #include "odp-util.h" | |
28 | #include "ofp-util.h" | |
29 | #include "ofpbuf.h" | |
5bee6e26 | 30 | #include "ofproto-provider.h" |
19a87e36 BP |
31 | #include "pinsched.h" |
32 | #include "poll-loop.h" | |
33 | #include "pktbuf.h" | |
34 | #include "rconn.h" | |
35 | #include "shash.h" | |
5bd31620 | 36 | #include "stream.h" |
19a87e36 BP |
37 | #include "timeval.h" |
38 | #include "vconn.h" | |
39 | #include "vlog.h" | |
40 | ||
41 | VLOG_DEFINE_THIS_MODULE(connmgr); | |
42 | static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); | |
43 | ||
19a87e36 BP |
44 | /* An OpenFlow connection. */ |
45 | struct ofconn { | |
46 | struct connmgr *connmgr; /* Connection's manager. */ | |
47 | struct list node; /* In struct connmgr's "all_conns" list. */ | |
48 | struct rconn *rconn; /* OpenFlow connection. */ | |
49 | enum ofconn_type type; /* Type. */ | |
50 | enum nx_flow_format flow_format; /* Currently selected flow format. */ | |
54834960 | 51 | enum nx_packet_in_format packet_in_format; /* OFPT_PACKET_IN format. */ |
6c1491fb | 52 | bool flow_mod_table_id; /* NXT_FLOW_MOD_TABLE_ID enabled? */ |
19a87e36 | 53 | |
7ee20df1 BP |
54 | /* Asynchronous flow table operation support. */ |
55 | struct list opgroups; /* Contains pending "ofopgroups", if any. */ | |
56 | struct ofpbuf *blocked; /* Postponed OpenFlow message, if any. */ | |
57 | bool retry; /* True if 'blocked' is ready to try again. */ | |
58 | ||
19a87e36 BP |
59 | /* OFPT_PACKET_IN related data. */ |
60 | struct rconn_packet_counter *packet_in_counter; /* # queued on 'rconn'. */ | |
61 | #define N_SCHEDULERS 2 | |
62 | struct pinsched *schedulers[N_SCHEDULERS]; | |
63 | struct pktbuf *pktbuf; /* OpenFlow packet buffers. */ | |
64 | int miss_send_len; /* Bytes to send of buffered packets. */ | |
65 | ||
66 | /* Number of OpenFlow messages queued on 'rconn' as replies to OpenFlow | |
67 | * requests, and the maximum number before we stop reading OpenFlow | |
68 | * requests. */ | |
69 | #define OFCONN_REPLY_MAX 100 | |
70 | struct rconn_packet_counter *reply_counter; | |
71 | ||
72 | /* type == OFCONN_PRIMARY only. */ | |
73 | enum nx_role role; /* Role. */ | |
74 | struct hmap_node hmap_node; /* In struct connmgr's "controllers" map. */ | |
75 | enum ofproto_band band; /* In-band or out-of-band? */ | |
76 | }; | |
77 | ||
78 | static struct ofconn *ofconn_create(struct connmgr *, struct rconn *, | |
79 | enum ofconn_type); | |
80 | static void ofconn_destroy(struct ofconn *); | |
81 | ||
82 | static void ofconn_reconfigure(struct ofconn *, | |
83 | const struct ofproto_controller *); | |
84 | ||
85 | static void ofconn_run(struct ofconn *, | |
7ee20df1 | 86 | bool (*handle_openflow)(struct ofconn *, |
19a87e36 | 87 | struct ofpbuf *ofp_msg)); |
7ee20df1 | 88 | static void ofconn_wait(struct ofconn *, bool handling_openflow); |
19a87e36 BP |
89 | |
90 | static const char *ofconn_get_target(const struct ofconn *); | |
91 | static char *ofconn_make_name(const struct connmgr *, const char *target); | |
92 | ||
93 | static void ofconn_set_rate_limit(struct ofconn *, int rate, int burst); | |
94 | ||
95 | static bool ofconn_receives_async_msgs(const struct ofconn *); | |
96 | ||
97 | static void ofconn_send(const struct ofconn *, struct ofpbuf *, | |
98 | struct rconn_packet_counter *); | |
99 | ||
100 | static void do_send_packet_in(struct ofpbuf *, void *ofconn_); | |
101 | ||
102 | /* A listener for incoming OpenFlow "service" connections. */ | |
103 | struct ofservice { | |
104 | struct hmap_node node; /* In struct connmgr's "services" hmap. */ | |
105 | struct pvconn *pvconn; /* OpenFlow connection listener. */ | |
106 | ||
107 | /* These are not used by ofservice directly. They are settings for | |
108 | * accepted "struct ofconn"s from the pvconn. */ | |
109 | int probe_interval; /* Max idle time before probing, in seconds. */ | |
110 | int rate_limit; /* Max packet-in rate in packets per second. */ | |
111 | int burst_limit; /* Limit on accumulating packet credits. */ | |
112 | }; | |
113 | ||
114 | static void ofservice_reconfigure(struct ofservice *, | |
115 | const struct ofproto_controller *); | |
116 | static int ofservice_create(struct connmgr *, const char *target); | |
117 | static void ofservice_destroy(struct connmgr *, struct ofservice *); | |
118 | static struct ofservice *ofservice_lookup(struct connmgr *, | |
119 | const char *target); | |
120 | ||
121 | /* Connection manager for an OpenFlow switch. */ | |
122 | struct connmgr { | |
123 | struct ofproto *ofproto; | |
124 | char *name; | |
125 | char *local_port_name; | |
126 | ||
127 | /* OpenFlow connections. */ | |
128 | struct hmap controllers; /* Controller "struct ofconn"s. */ | |
129 | struct list all_conns; /* Contains "struct ofconn"s. */ | |
130 | ||
131 | /* OpenFlow listeners. */ | |
132 | struct hmap services; /* Contains "struct ofservice"s. */ | |
133 | struct pvconn **snoops; | |
134 | size_t n_snoops; | |
135 | ||
136 | /* Fail open. */ | |
137 | struct fail_open *fail_open; | |
138 | enum ofproto_fail_mode fail_mode; | |
139 | ||
140 | /* In-band control. */ | |
141 | struct in_band *in_band; | |
19a87e36 BP |
142 | struct sockaddr_in *extra_in_band_remotes; |
143 | size_t n_extra_remotes; | |
144 | int in_band_queue; | |
145 | }; | |
146 | ||
147 | static void update_in_band_remotes(struct connmgr *); | |
148 | static void add_snooper(struct connmgr *, struct vconn *); | |
149 | ||
150 | /* Creates and returns a new connection manager owned by 'ofproto'. 'name' is | |
151 | * a name for the ofproto suitable for using in log messages. | |
152 | * 'local_port_name' is the name of the local port (OFPP_LOCAL) within | |
153 | * 'ofproto'. */ | |
154 | struct connmgr * | |
155 | connmgr_create(struct ofproto *ofproto, | |
156 | const char *name, const char *local_port_name) | |
157 | { | |
158 | struct connmgr *mgr; | |
159 | ||
160 | mgr = xmalloc(sizeof *mgr); | |
161 | mgr->ofproto = ofproto; | |
162 | mgr->name = xstrdup(name); | |
163 | mgr->local_port_name = xstrdup(local_port_name); | |
164 | ||
165 | hmap_init(&mgr->controllers); | |
166 | list_init(&mgr->all_conns); | |
167 | ||
168 | hmap_init(&mgr->services); | |
169 | mgr->snoops = NULL; | |
170 | mgr->n_snoops = 0; | |
171 | ||
172 | mgr->fail_open = NULL; | |
173 | mgr->fail_mode = OFPROTO_FAIL_SECURE; | |
174 | ||
175 | mgr->in_band = NULL; | |
19a87e36 BP |
176 | mgr->extra_in_band_remotes = NULL; |
177 | mgr->n_extra_remotes = 0; | |
178 | mgr->in_band_queue = -1; | |
179 | ||
180 | return mgr; | |
181 | } | |
182 | ||
183 | /* Frees 'mgr' and all of its resources. */ | |
184 | void | |
185 | connmgr_destroy(struct connmgr *mgr) | |
186 | { | |
187 | struct ofservice *ofservice, *next_ofservice; | |
188 | struct ofconn *ofconn, *next_ofconn; | |
189 | size_t i; | |
190 | ||
191 | if (!mgr) { | |
192 | return; | |
193 | } | |
194 | ||
195 | LIST_FOR_EACH_SAFE (ofconn, next_ofconn, node, &mgr->all_conns) { | |
196 | ofconn_destroy(ofconn); | |
197 | } | |
198 | hmap_destroy(&mgr->controllers); | |
199 | ||
200 | HMAP_FOR_EACH_SAFE (ofservice, next_ofservice, node, &mgr->services) { | |
201 | ofservice_destroy(mgr, ofservice); | |
202 | } | |
203 | hmap_destroy(&mgr->services); | |
204 | ||
205 | for (i = 0; i < mgr->n_snoops; i++) { | |
206 | pvconn_close(mgr->snoops[i]); | |
207 | } | |
208 | free(mgr->snoops); | |
209 | ||
210 | fail_open_destroy(mgr->fail_open); | |
211 | mgr->fail_open = NULL; | |
212 | ||
213 | in_band_destroy(mgr->in_band); | |
214 | mgr->in_band = NULL; | |
215 | free(mgr->extra_in_band_remotes); | |
216 | free(mgr->name); | |
217 | free(mgr->local_port_name); | |
218 | ||
219 | free(mgr); | |
220 | } | |
221 | ||
7ee20df1 BP |
222 | /* Does all of the periodic maintenance required by 'mgr'. |
223 | * | |
224 | * If 'handle_openflow' is nonnull, calls 'handle_openflow' for each message | |
225 | * received on an OpenFlow connection, passing along the OpenFlow connection | |
226 | * itself and the message that was sent. If 'handle_openflow' returns true, | |
227 | * the message is considered to be fully processed. If 'handle_openflow' | |
228 | * returns false, the message is considered not to have been processed at all; | |
229 | * it will be stored and re-presented to 'handle_openflow' following the next | |
230 | * call to connmgr_retry(). 'handle_openflow' must not modify or free the | |
231 | * message. | |
232 | * | |
233 | * If 'handle_openflow' is NULL, no OpenFlow messages will be processed and | |
234 | * other activities that could affect the flow table (in-band processing, | |
235 | * fail-open processing) are suppressed too. */ | |
19a87e36 BP |
236 | void |
237 | connmgr_run(struct connmgr *mgr, | |
7ee20df1 | 238 | bool (*handle_openflow)(struct ofconn *, struct ofpbuf *ofp_msg)) |
19a87e36 BP |
239 | { |
240 | struct ofconn *ofconn, *next_ofconn; | |
241 | struct ofservice *ofservice; | |
242 | size_t i; | |
243 | ||
7ee20df1 | 244 | if (handle_openflow && mgr->in_band) { |
6da1e809 BP |
245 | if (!in_band_run(mgr->in_band)) { |
246 | in_band_destroy(mgr->in_band); | |
247 | mgr->in_band = NULL; | |
248 | } | |
19a87e36 BP |
249 | } |
250 | ||
251 | LIST_FOR_EACH_SAFE (ofconn, next_ofconn, node, &mgr->all_conns) { | |
252 | ofconn_run(ofconn, handle_openflow); | |
253 | } | |
254 | ||
255 | /* Fail-open maintenance. Do this after processing the ofconns since | |
256 | * fail-open checks the status of the controller rconn. */ | |
7ee20df1 | 257 | if (handle_openflow && mgr->fail_open) { |
19a87e36 BP |
258 | fail_open_run(mgr->fail_open); |
259 | } | |
260 | ||
261 | HMAP_FOR_EACH (ofservice, node, &mgr->services) { | |
262 | struct vconn *vconn; | |
263 | int retval; | |
264 | ||
265 | retval = pvconn_accept(ofservice->pvconn, OFP_VERSION, &vconn); | |
266 | if (!retval) { | |
267 | struct rconn *rconn; | |
268 | char *name; | |
269 | ||
270 | rconn = rconn_create(ofservice->probe_interval, 0); | |
271 | name = ofconn_make_name(mgr, vconn_get_name(vconn)); | |
272 | rconn_connect_unreliably(rconn, vconn, name); | |
273 | free(name); | |
274 | ||
275 | ofconn = ofconn_create(mgr, rconn, OFCONN_SERVICE); | |
276 | ofconn_set_rate_limit(ofconn, ofservice->rate_limit, | |
277 | ofservice->burst_limit); | |
278 | } else if (retval != EAGAIN) { | |
279 | VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval)); | |
280 | } | |
281 | } | |
282 | ||
283 | for (i = 0; i < mgr->n_snoops; i++) { | |
284 | struct vconn *vconn; | |
285 | int retval; | |
286 | ||
287 | retval = pvconn_accept(mgr->snoops[i], OFP_VERSION, &vconn); | |
288 | if (!retval) { | |
289 | add_snooper(mgr, vconn); | |
290 | } else if (retval != EAGAIN) { | |
291 | VLOG_WARN_RL(&rl, "accept failed (%s)", strerror(retval)); | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
7ee20df1 BP |
296 | /* Causes the poll loop to wake up when connmgr_run() needs to run. |
297 | * | |
298 | * If 'handling_openflow' is true, arriving OpenFlow messages and other | |
299 | * activities that affect the flow table will wake up the poll loop. If | |
300 | * 'handling_openflow' is false, they will not. */ | |
19a87e36 | 301 | void |
7ee20df1 | 302 | connmgr_wait(struct connmgr *mgr, bool handling_openflow) |
19a87e36 BP |
303 | { |
304 | struct ofservice *ofservice; | |
305 | struct ofconn *ofconn; | |
306 | size_t i; | |
307 | ||
308 | LIST_FOR_EACH (ofconn, node, &mgr->all_conns) { | |
7ee20df1 | 309 | ofconn_wait(ofconn, handling_openflow); |
19a87e36 | 310 | } |
7ee20df1 | 311 | if (handling_openflow && mgr->in_band) { |
19a87e36 BP |
312 | in_band_wait(mgr->in_band); |
313 | } | |
7ee20df1 | 314 | if (handling_openflow && mgr->fail_open) { |
19a87e36 BP |
315 | fail_open_wait(mgr->fail_open); |
316 | } | |
317 | HMAP_FOR_EACH (ofservice, node, &mgr->services) { | |
318 | pvconn_wait(ofservice->pvconn); | |
319 | } | |
320 | for (i = 0; i < mgr->n_snoops; i++) { | |
321 | pvconn_wait(mgr->snoops[i]); | |
322 | } | |
323 | } | |
324 | ||
325 | /* Returns the ofproto that owns 'ofconn''s connmgr. */ | |
326 | struct ofproto * | |
327 | ofconn_get_ofproto(const struct ofconn *ofconn) | |
328 | { | |
329 | return ofconn->connmgr->ofproto; | |
330 | } | |
7ee20df1 BP |
331 | |
332 | /* If processing of OpenFlow messages was blocked on any 'mgr' ofconns by | |
333 | * returning false to the 'handle_openflow' callback to connmgr_run(), this | |
334 | * re-enables them. */ | |
335 | void | |
336 | connmgr_retry(struct connmgr *mgr) | |
337 | { | |
338 | struct ofconn *ofconn; | |
339 | ||
340 | LIST_FOR_EACH (ofconn, node, &mgr->all_conns) { | |
341 | ofconn->retry = true; | |
342 | } | |
343 | } | |
19a87e36 BP |
344 | \f |
345 | /* OpenFlow configuration. */ | |
346 | ||
347 | static void add_controller(struct connmgr *, const char *target); | |
348 | static struct ofconn *find_controller_by_target(struct connmgr *, | |
349 | const char *target); | |
350 | static void update_fail_open(struct connmgr *); | |
351 | static int set_pvconns(struct pvconn ***pvconnsp, size_t *n_pvconnsp, | |
81e2083f | 352 | const struct sset *); |
19a87e36 BP |
353 | |
354 | /* Returns true if 'mgr' has any configured primary controllers. | |
355 | * | |
356 | * Service controllers do not count, but configured primary controllers do | |
357 | * count whether or not they are currently connected. */ | |
358 | bool | |
359 | connmgr_has_controllers(const struct connmgr *mgr) | |
360 | { | |
361 | return !hmap_is_empty(&mgr->controllers); | |
362 | } | |
363 | ||
364 | /* Initializes 'info' and populates it with information about each configured | |
365 | * primary controller. The keys in 'info' are the controllers' targets; the | |
366 | * data values are corresponding "struct ofproto_controller_info". | |
367 | * | |
368 | * The caller owns 'info' and everything in it and should free it when it is no | |
369 | * longer needed. */ | |
370 | void | |
371 | connmgr_get_controller_info(struct connmgr *mgr, struct shash *info) | |
372 | { | |
373 | const struct ofconn *ofconn; | |
374 | ||
19a87e36 BP |
375 | HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) { |
376 | const struct rconn *rconn = ofconn->rconn; | |
5d279086 | 377 | const char *target = rconn_get_target(rconn); |
19a87e36 | 378 | |
5d279086 AE |
379 | if (!shash_find(info, target)) { |
380 | struct ofproto_controller_info *cinfo = xmalloc(sizeof *cinfo); | |
381 | time_t now = time_now(); | |
382 | time_t last_connection = rconn_get_last_connection(rconn); | |
383 | time_t last_disconnect = rconn_get_last_disconnect(rconn); | |
384 | int last_error = rconn_get_last_error(rconn); | |
19a87e36 | 385 | |
5d279086 | 386 | shash_add(info, target, cinfo); |
19a87e36 | 387 | |
5d279086 AE |
388 | cinfo->is_connected = rconn_is_connected(rconn); |
389 | cinfo->role = ofconn->role; | |
19a87e36 | 390 | |
5d279086 | 391 | cinfo->pairs.n = 0; |
19a87e36 | 392 | |
5d279086 AE |
393 | if (last_error) { |
394 | cinfo->pairs.keys[cinfo->pairs.n] = "last_error"; | |
395 | cinfo->pairs.values[cinfo->pairs.n++] | |
396 | = xstrdup(ovs_retval_to_string(last_error)); | |
397 | } | |
19a87e36 | 398 | |
5d279086 | 399 | cinfo->pairs.keys[cinfo->pairs.n] = "state"; |
19a87e36 | 400 | cinfo->pairs.values[cinfo->pairs.n++] |
5d279086 AE |
401 | = xstrdup(rconn_get_state(rconn)); |
402 | ||
403 | if (last_connection != TIME_MIN) { | |
404 | cinfo->pairs.keys[cinfo->pairs.n] = "sec_since_connect"; | |
405 | cinfo->pairs.values[cinfo->pairs.n++] | |
406 | = xasprintf("%ld", (long int) (now - last_connection)); | |
407 | } | |
408 | ||
409 | if (last_disconnect != TIME_MIN) { | |
410 | cinfo->pairs.keys[cinfo->pairs.n] = "sec_since_disconnect"; | |
411 | cinfo->pairs.values[cinfo->pairs.n++] | |
412 | = xasprintf("%ld", (long int) (now - last_disconnect)); | |
413 | } | |
19a87e36 BP |
414 | } |
415 | } | |
416 | } | |
417 | ||
72ba2ed3 AE |
418 | void |
419 | connmgr_free_controller_info(struct shash *info) | |
420 | { | |
421 | struct shash_node *node; | |
422 | ||
423 | SHASH_FOR_EACH (node, info) { | |
424 | struct ofproto_controller_info *cinfo = node->data; | |
425 | while (cinfo->pairs.n) { | |
426 | free((char *) cinfo->pairs.values[--cinfo->pairs.n]); | |
427 | } | |
428 | free(cinfo); | |
429 | } | |
430 | shash_destroy(info); | |
431 | } | |
432 | ||
19a87e36 BP |
433 | /* Changes 'mgr''s set of controllers to the 'n_controllers' controllers in |
434 | * 'controllers'. */ | |
435 | void | |
436 | connmgr_set_controllers(struct connmgr *mgr, | |
437 | const struct ofproto_controller *controllers, | |
438 | size_t n_controllers) | |
439 | { | |
08fd19f0 | 440 | bool had_controllers = connmgr_has_controllers(mgr); |
19a87e36 BP |
441 | struct shash new_controllers; |
442 | struct ofconn *ofconn, *next_ofconn; | |
443 | struct ofservice *ofservice, *next_ofservice; | |
19a87e36 BP |
444 | size_t i; |
445 | ||
446 | /* Create newly configured controllers and services. | |
447 | * Create a name to ofproto_controller mapping in 'new_controllers'. */ | |
448 | shash_init(&new_controllers); | |
449 | for (i = 0; i < n_controllers; i++) { | |
450 | const struct ofproto_controller *c = &controllers[i]; | |
451 | ||
452 | if (!vconn_verify_name(c->target)) { | |
453 | if (!find_controller_by_target(mgr, c->target)) { | |
454 | add_controller(mgr, c->target); | |
455 | } | |
456 | } else if (!pvconn_verify_name(c->target)) { | |
457 | if (!ofservice_lookup(mgr, c->target)) { | |
458 | ofservice_create(mgr, c->target); | |
459 | } | |
460 | } else { | |
461 | VLOG_WARN_RL(&rl, "%s: unsupported controller \"%s\"", | |
462 | mgr->name, c->target); | |
463 | continue; | |
464 | } | |
465 | ||
466 | shash_add_once(&new_controllers, c->target, &controllers[i]); | |
467 | } | |
468 | ||
469 | /* Delete controllers that are no longer configured. | |
470 | * Update configuration of all now-existing controllers. */ | |
19a87e36 BP |
471 | HMAP_FOR_EACH_SAFE (ofconn, next_ofconn, hmap_node, &mgr->controllers) { |
472 | struct ofproto_controller *c; | |
473 | ||
474 | c = shash_find_data(&new_controllers, ofconn_get_target(ofconn)); | |
475 | if (!c) { | |
476 | ofconn_destroy(ofconn); | |
477 | } else { | |
478 | ofconn_reconfigure(ofconn, c); | |
479 | } | |
480 | } | |
481 | ||
482 | /* Delete services that are no longer configured. | |
483 | * Update configuration of all now-existing services. */ | |
484 | HMAP_FOR_EACH_SAFE (ofservice, next_ofservice, node, &mgr->services) { | |
485 | struct ofproto_controller *c; | |
486 | ||
487 | c = shash_find_data(&new_controllers, | |
488 | pvconn_get_name(ofservice->pvconn)); | |
489 | if (!c) { | |
490 | ofservice_destroy(mgr, ofservice); | |
491 | } else { | |
492 | ofservice_reconfigure(ofservice, c); | |
493 | } | |
494 | } | |
495 | ||
496 | shash_destroy(&new_controllers); | |
497 | ||
498 | update_in_band_remotes(mgr); | |
499 | update_fail_open(mgr); | |
08fd19f0 BP |
500 | if (had_controllers != connmgr_has_controllers(mgr)) { |
501 | ofproto_flush_flows(mgr->ofproto); | |
502 | } | |
19a87e36 BP |
503 | } |
504 | ||
505 | /* Drops the connections between 'mgr' and all of its primary and secondary | |
506 | * controllers, forcing them to reconnect. */ | |
507 | void | |
508 | connmgr_reconnect(const struct connmgr *mgr) | |
509 | { | |
510 | struct ofconn *ofconn; | |
511 | ||
512 | LIST_FOR_EACH (ofconn, node, &mgr->all_conns) { | |
513 | rconn_reconnect(ofconn->rconn); | |
514 | } | |
515 | } | |
516 | ||
517 | /* Sets the "snoops" for 'mgr' to the pvconn targets listed in 'snoops'. | |
518 | * | |
519 | * A "snoop" is a pvconn to which every OpenFlow message to or from the most | |
520 | * important controller on 'mgr' is mirrored. */ | |
521 | int | |
81e2083f | 522 | connmgr_set_snoops(struct connmgr *mgr, const struct sset *snoops) |
19a87e36 BP |
523 | { |
524 | return set_pvconns(&mgr->snoops, &mgr->n_snoops, snoops); | |
525 | } | |
526 | ||
527 | /* Adds each of the snoops currently configured on 'mgr' to 'snoops'. */ | |
528 | void | |
81e2083f | 529 | connmgr_get_snoops(const struct connmgr *mgr, struct sset *snoops) |
19a87e36 BP |
530 | { |
531 | size_t i; | |
532 | ||
533 | for (i = 0; i < mgr->n_snoops; i++) { | |
81e2083f | 534 | sset_add(snoops, pvconn_get_name(mgr->snoops[i])); |
19a87e36 BP |
535 | } |
536 | } | |
537 | ||
81e2083f BP |
538 | /* Returns true if 'mgr' has at least one snoop, false if it has none. */ |
539 | bool | |
540 | connmgr_has_snoops(const struct connmgr *mgr) | |
541 | { | |
542 | return mgr->n_snoops > 0; | |
543 | } | |
544 | ||
19a87e36 BP |
545 | /* Creates a new controller for 'target' in 'mgr'. update_controller() needs |
546 | * to be called later to finish the new ofconn's configuration. */ | |
547 | static void | |
548 | add_controller(struct connmgr *mgr, const char *target) | |
549 | { | |
550 | char *name = ofconn_make_name(mgr, target); | |
551 | struct ofconn *ofconn; | |
552 | ||
553 | ofconn = ofconn_create(mgr, rconn_create(5, 8), OFCONN_PRIMARY); | |
554 | ofconn->pktbuf = pktbuf_create(); | |
555 | ofconn->miss_send_len = OFP_DEFAULT_MISS_SEND_LEN; | |
556 | rconn_connect(ofconn->rconn, target, name); | |
557 | hmap_insert(&mgr->controllers, &ofconn->hmap_node, hash_string(target, 0)); | |
558 | ||
559 | free(name); | |
560 | } | |
561 | ||
562 | static struct ofconn * | |
563 | find_controller_by_target(struct connmgr *mgr, const char *target) | |
564 | { | |
565 | struct ofconn *ofconn; | |
566 | ||
567 | HMAP_FOR_EACH_WITH_HASH (ofconn, hmap_node, | |
568 | hash_string(target, 0), &mgr->controllers) { | |
569 | if (!strcmp(ofconn_get_target(ofconn), target)) { | |
570 | return ofconn; | |
571 | } | |
572 | } | |
573 | return NULL; | |
574 | } | |
575 | ||
576 | static void | |
577 | update_in_band_remotes(struct connmgr *mgr) | |
578 | { | |
579 | struct sockaddr_in *addrs; | |
580 | size_t max_addrs, n_addrs; | |
581 | struct ofconn *ofconn; | |
582 | size_t i; | |
583 | ||
584 | /* Allocate enough memory for as many remotes as we could possibly have. */ | |
585 | max_addrs = mgr->n_extra_remotes + hmap_count(&mgr->controllers); | |
586 | addrs = xmalloc(max_addrs * sizeof *addrs); | |
587 | n_addrs = 0; | |
588 | ||
589 | /* Add all the remotes. */ | |
590 | HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) { | |
591 | struct sockaddr_in *sin = &addrs[n_addrs]; | |
ac4c900d | 592 | const char *target = rconn_get_target(ofconn->rconn); |
19a87e36 BP |
593 | |
594 | if (ofconn->band == OFPROTO_OUT_OF_BAND) { | |
595 | continue; | |
596 | } | |
597 | ||
ac4c900d AA |
598 | if (stream_parse_target_with_default_ports(target, |
599 | OFP_TCP_PORT, | |
600 | OFP_SSL_PORT, | |
601 | sin)) { | |
19a87e36 BP |
602 | n_addrs++; |
603 | } | |
604 | } | |
605 | for (i = 0; i < mgr->n_extra_remotes; i++) { | |
606 | addrs[n_addrs++] = mgr->extra_in_band_remotes[i]; | |
607 | } | |
608 | ||
609 | /* Create or update or destroy in-band. */ | |
610 | if (n_addrs) { | |
611 | if (!mgr->in_band) { | |
612 | in_band_create(mgr->ofproto, mgr->local_port_name, &mgr->in_band); | |
613 | } | |
19a87e36 | 614 | in_band_set_queue(mgr->in_band, mgr->in_band_queue); |
19a87e36 | 615 | } else { |
6da1e809 BP |
616 | /* in_band_run() needs a chance to delete any existing in-band flows. |
617 | * We will destroy mgr->in_band after it's done with that. */ | |
618 | } | |
619 | if (mgr->in_band) { | |
620 | in_band_set_remotes(mgr->in_band, addrs, n_addrs); | |
19a87e36 BP |
621 | } |
622 | ||
623 | /* Clean up. */ | |
624 | free(addrs); | |
625 | } | |
626 | ||
627 | static void | |
628 | update_fail_open(struct connmgr *mgr) | |
629 | { | |
630 | if (connmgr_has_controllers(mgr) | |
631 | && mgr->fail_mode == OFPROTO_FAIL_STANDALONE) { | |
632 | if (!mgr->fail_open) { | |
633 | mgr->fail_open = fail_open_create(mgr->ofproto, mgr); | |
634 | } | |
635 | } else { | |
636 | fail_open_destroy(mgr->fail_open); | |
637 | mgr->fail_open = NULL; | |
638 | } | |
639 | } | |
640 | ||
641 | static int | |
642 | set_pvconns(struct pvconn ***pvconnsp, size_t *n_pvconnsp, | |
81e2083f | 643 | const struct sset *sset) |
19a87e36 BP |
644 | { |
645 | struct pvconn **pvconns = *pvconnsp; | |
646 | size_t n_pvconns = *n_pvconnsp; | |
81e2083f | 647 | const char *name; |
19a87e36 BP |
648 | int retval = 0; |
649 | size_t i; | |
650 | ||
651 | for (i = 0; i < n_pvconns; i++) { | |
652 | pvconn_close(pvconns[i]); | |
653 | } | |
654 | free(pvconns); | |
655 | ||
81e2083f | 656 | pvconns = xmalloc(sset_count(sset) * sizeof *pvconns); |
19a87e36 | 657 | n_pvconns = 0; |
81e2083f | 658 | SSET_FOR_EACH (name, sset) { |
19a87e36 BP |
659 | struct pvconn *pvconn; |
660 | int error; | |
661 | ||
662 | error = pvconn_open(name, &pvconn); | |
663 | if (!error) { | |
664 | pvconns[n_pvconns++] = pvconn; | |
665 | } else { | |
666 | VLOG_ERR("failed to listen on %s: %s", name, strerror(error)); | |
667 | if (!retval) { | |
668 | retval = error; | |
669 | } | |
670 | } | |
671 | } | |
672 | ||
673 | *pvconnsp = pvconns; | |
674 | *n_pvconnsp = n_pvconns; | |
675 | ||
676 | return retval; | |
677 | } | |
678 | ||
679 | /* Returns a "preference level" for snooping 'ofconn'. A higher return value | |
680 | * means that 'ofconn' is more interesting for monitoring than a lower return | |
681 | * value. */ | |
682 | static int | |
683 | snoop_preference(const struct ofconn *ofconn) | |
684 | { | |
685 | switch (ofconn->role) { | |
686 | case NX_ROLE_MASTER: | |
687 | return 3; | |
688 | case NX_ROLE_OTHER: | |
689 | return 2; | |
690 | case NX_ROLE_SLAVE: | |
691 | return 1; | |
692 | default: | |
693 | /* Shouldn't happen. */ | |
694 | return 0; | |
695 | } | |
696 | } | |
697 | ||
698 | /* One of 'mgr''s "snoop" pvconns has accepted a new connection on 'vconn'. | |
699 | * Connects this vconn to a controller. */ | |
700 | static void | |
701 | add_snooper(struct connmgr *mgr, struct vconn *vconn) | |
702 | { | |
703 | struct ofconn *ofconn, *best; | |
704 | ||
705 | /* Pick a controller for monitoring. */ | |
706 | best = NULL; | |
707 | LIST_FOR_EACH (ofconn, node, &mgr->all_conns) { | |
708 | if (ofconn->type == OFCONN_PRIMARY | |
709 | && (!best || snoop_preference(ofconn) > snoop_preference(best))) { | |
710 | best = ofconn; | |
711 | } | |
712 | } | |
713 | ||
714 | if (best) { | |
715 | rconn_add_monitor(best->rconn, vconn); | |
716 | } else { | |
717 | VLOG_INFO_RL(&rl, "no controller connection to snoop"); | |
718 | vconn_close(vconn); | |
719 | } | |
720 | } | |
721 | \f | |
722 | /* Public ofconn functions. */ | |
723 | ||
724 | /* Returns the connection type, either OFCONN_PRIMARY or OFCONN_SERVICE. */ | |
725 | enum ofconn_type | |
726 | ofconn_get_type(const struct ofconn *ofconn) | |
727 | { | |
728 | return ofconn->type; | |
729 | } | |
730 | ||
731 | /* Returns the role configured for 'ofconn'. | |
732 | * | |
733 | * The default role, if no other role has been set, is NX_ROLE_OTHER. */ | |
734 | enum nx_role | |
735 | ofconn_get_role(const struct ofconn *ofconn) | |
736 | { | |
737 | return ofconn->role; | |
738 | } | |
739 | ||
740 | /* Changes 'ofconn''s role to 'role'. If 'role' is NX_ROLE_MASTER then any | |
741 | * existing master is demoted to a slave. */ | |
742 | void | |
743 | ofconn_set_role(struct ofconn *ofconn, enum nx_role role) | |
744 | { | |
745 | if (role == NX_ROLE_MASTER) { | |
746 | struct ofconn *other; | |
747 | ||
748 | HMAP_FOR_EACH (other, hmap_node, &ofconn->connmgr->controllers) { | |
749 | if (other->role == NX_ROLE_MASTER) { | |
750 | other->role = NX_ROLE_SLAVE; | |
751 | } | |
752 | } | |
753 | } | |
754 | ofconn->role = role; | |
755 | } | |
756 | ||
757 | /* Returns the currently configured flow format for 'ofconn', one of NXFF_*. | |
758 | * | |
759 | * The default, if no other format has been set, is NXFF_OPENFLOW10. */ | |
760 | enum nx_flow_format | |
761 | ofconn_get_flow_format(struct ofconn *ofconn) | |
762 | { | |
763 | return ofconn->flow_format; | |
764 | } | |
765 | ||
766 | /* Sets the flow format for 'ofconn' to 'flow_format' (one of NXFF_*). */ | |
767 | void | |
768 | ofconn_set_flow_format(struct ofconn *ofconn, enum nx_flow_format flow_format) | |
769 | { | |
770 | ofconn->flow_format = flow_format; | |
771 | } | |
772 | ||
54834960 EJ |
773 | /* Returns the currently configured packet in format for 'ofconn', one of |
774 | * NXPIF_*. | |
775 | * | |
776 | * The default, if no other format has been set, is NXPIF_OPENFLOW10. */ | |
777 | enum nx_packet_in_format | |
778 | ofconn_get_packet_in_format(struct ofconn *ofconn) | |
779 | { | |
780 | return ofconn->packet_in_format; | |
781 | } | |
782 | ||
783 | /* Sets the packet in format for 'ofconn' to 'packet_in_format' (one of | |
784 | * NXPIF_*). */ | |
785 | void | |
786 | ofconn_set_packet_in_format(struct ofconn *ofconn, | |
787 | enum nx_packet_in_format packet_in_format) | |
788 | { | |
789 | ofconn->packet_in_format = packet_in_format; | |
790 | } | |
791 | ||
6c1491fb BP |
792 | /* Returns true if the NXT_FLOW_MOD_TABLE_ID extension is enabled, false |
793 | * otherwise. | |
794 | * | |
795 | * By default the extension is not enabled. */ | |
796 | bool | |
797 | ofconn_get_flow_mod_table_id(const struct ofconn *ofconn) | |
798 | { | |
799 | return ofconn->flow_mod_table_id; | |
800 | } | |
801 | ||
802 | /* Enables or disables (according to 'enable') the NXT_FLOW_MOD_TABLE_ID | |
803 | * extension on 'ofconn'. */ | |
804 | void | |
805 | ofconn_set_flow_mod_table_id(struct ofconn *ofconn, bool enable) | |
806 | { | |
807 | ofconn->flow_mod_table_id = enable; | |
808 | } | |
809 | ||
19a87e36 BP |
810 | /* Returns the default miss send length for 'ofconn'. */ |
811 | int | |
812 | ofconn_get_miss_send_len(const struct ofconn *ofconn) | |
813 | { | |
814 | return ofconn->miss_send_len; | |
815 | } | |
816 | ||
817 | /* Sets the default miss send length for 'ofconn' to 'miss_send_len'. */ | |
818 | void | |
819 | ofconn_set_miss_send_len(struct ofconn *ofconn, int miss_send_len) | |
820 | { | |
821 | ofconn->miss_send_len = miss_send_len; | |
822 | } | |
823 | ||
824 | /* Sends 'msg' on 'ofconn', accounting it as a reply. (If there is a | |
825 | * sufficient number of OpenFlow replies in-flight on a single ofconn, then the | |
826 | * connmgr will stop accepting new OpenFlow requests on that ofconn until the | |
827 | * controller has accepted some of the replies.) */ | |
828 | void | |
829 | ofconn_send_reply(const struct ofconn *ofconn, struct ofpbuf *msg) | |
830 | { | |
831 | ofconn_send(ofconn, msg, ofconn->reply_counter); | |
832 | } | |
833 | ||
63f2140a BP |
834 | /* Sends each of the messages in list 'replies' on 'ofconn' in order, |
835 | * accounting them as replies. */ | |
836 | void | |
837 | ofconn_send_replies(const struct ofconn *ofconn, struct list *replies) | |
838 | { | |
839 | struct ofpbuf *reply, *next; | |
840 | ||
841 | LIST_FOR_EACH_SAFE (reply, next, list_node, replies) { | |
842 | list_remove(&reply->list_node); | |
843 | ofconn_send_reply(ofconn, reply); | |
844 | } | |
845 | } | |
846 | ||
1be5ff75 BP |
847 | /* Sends 'error', which should be an OpenFlow error created with |
848 | * e.g. ofp_mkerr(), on 'ofconn', as a reply to 'request'. Only at most the | |
849 | * first 64 bytes of 'request' are used. */ | |
850 | void | |
851 | ofconn_send_error(const struct ofconn *ofconn, | |
852 | const struct ofp_header *request, int error) | |
853 | { | |
76589937 BP |
854 | struct ofpbuf *msg; |
855 | ||
856 | msg = ofputil_encode_error_msg(error, request); | |
1be5ff75 | 857 | if (msg) { |
76589937 BP |
858 | static struct vlog_rate_limit err_rl = VLOG_RATE_LIMIT_INIT(10, 10); |
859 | ||
860 | if (!VLOG_DROP_INFO(&err_rl)) { | |
861 | const struct ofputil_msg_type *type; | |
862 | const char *type_name; | |
863 | size_t request_len; | |
864 | char *error_s; | |
865 | ||
866 | request_len = ntohs(request->length); | |
867 | type_name = (!ofputil_decode_msg_type_partial(request, | |
868 | MIN(64, request_len), | |
869 | &type) | |
870 | ? ofputil_msg_type_name(type) | |
871 | : "invalid"); | |
872 | ||
873 | error_s = ofputil_error_to_string(error); | |
874 | VLOG_INFO("%s: sending %s error reply to %s message", | |
875 | rconn_get_name(ofconn->rconn), error_s, type_name); | |
876 | free(error_s); | |
877 | } | |
1be5ff75 BP |
878 | ofconn_send_reply(ofconn, msg); |
879 | } | |
880 | } | |
881 | ||
19a87e36 BP |
882 | /* Same as pktbuf_retrieve(), using the pktbuf owned by 'ofconn'. */ |
883 | int | |
884 | ofconn_pktbuf_retrieve(struct ofconn *ofconn, uint32_t id, | |
885 | struct ofpbuf **bufferp, uint16_t *in_port) | |
886 | { | |
887 | return pktbuf_retrieve(ofconn->pktbuf, id, bufferp, in_port); | |
888 | } | |
7ee20df1 BP |
889 | |
890 | /* Returns true if 'ofconn' has any pending opgroups. */ | |
891 | bool | |
892 | ofconn_has_pending_opgroups(const struct ofconn *ofconn) | |
893 | { | |
894 | return !list_is_empty(&ofconn->opgroups); | |
895 | } | |
896 | ||
7ee20df1 BP |
897 | /* Adds 'ofconn_node' to 'ofconn''s list of pending opgroups. |
898 | * | |
899 | * If 'ofconn' is destroyed or its connection drops, then 'ofconn' will remove | |
900 | * 'ofconn_node' from the list and re-initialize it with list_init(). The | |
901 | * client may, therefore, use list_is_empty(ofconn_node) to determine whether | |
902 | * 'ofconn_node' is still associated with an active ofconn. | |
903 | * | |
904 | * The client may also remove ofconn_node from the list itself, with | |
905 | * list_remove(). */ | |
906 | void | |
907 | ofconn_add_opgroup(struct ofconn *ofconn, struct list *ofconn_node) | |
908 | { | |
909 | list_push_back(&ofconn->opgroups, ofconn_node); | |
910 | } | |
19a87e36 BP |
911 | \f |
912 | /* Private ofconn functions. */ | |
913 | ||
914 | static const char * | |
915 | ofconn_get_target(const struct ofconn *ofconn) | |
916 | { | |
917 | return rconn_get_target(ofconn->rconn); | |
918 | } | |
919 | ||
920 | static struct ofconn * | |
921 | ofconn_create(struct connmgr *mgr, struct rconn *rconn, enum ofconn_type type) | |
922 | { | |
923 | struct ofconn *ofconn = xzalloc(sizeof *ofconn); | |
924 | ofconn->connmgr = mgr; | |
925 | list_push_back(&mgr->all_conns, &ofconn->node); | |
926 | ofconn->rconn = rconn; | |
927 | ofconn->type = type; | |
928 | ofconn->flow_format = NXFF_OPENFLOW10; | |
54834960 | 929 | ofconn->packet_in_format = NXPIF_OPENFLOW10; |
6c1491fb | 930 | ofconn->flow_mod_table_id = false; |
7ee20df1 | 931 | list_init(&ofconn->opgroups); |
19a87e36 BP |
932 | ofconn->role = NX_ROLE_OTHER; |
933 | ofconn->packet_in_counter = rconn_packet_counter_create (); | |
934 | ofconn->pktbuf = NULL; | |
935 | ofconn->miss_send_len = 0; | |
936 | ofconn->reply_counter = rconn_packet_counter_create (); | |
937 | return ofconn; | |
938 | } | |
939 | ||
7ee20df1 BP |
940 | /* Disassociates 'ofconn' from all of the ofopgroups that it initiated that |
941 | * have not yet completed. (Those ofopgroups will still run to completion in | |
942 | * the usual way, but any errors that they run into will not be reported on any | |
943 | * OpenFlow channel.) | |
944 | * | |
945 | * Also discards any blocked operation on 'ofconn'. */ | |
946 | static void | |
947 | ofconn_flush(struct ofconn *ofconn) | |
948 | { | |
949 | while (!list_is_empty(&ofconn->opgroups)) { | |
950 | list_init(list_pop_front(&ofconn->opgroups)); | |
951 | } | |
952 | ofpbuf_delete(ofconn->blocked); | |
953 | ofconn->blocked = NULL; | |
954 | } | |
955 | ||
19a87e36 BP |
956 | static void |
957 | ofconn_destroy(struct ofconn *ofconn) | |
958 | { | |
7ee20df1 BP |
959 | ofconn_flush(ofconn); |
960 | ||
19a87e36 BP |
961 | if (ofconn->type == OFCONN_PRIMARY) { |
962 | hmap_remove(&ofconn->connmgr->controllers, &ofconn->hmap_node); | |
963 | } | |
964 | ||
965 | list_remove(&ofconn->node); | |
966 | rconn_destroy(ofconn->rconn); | |
967 | rconn_packet_counter_destroy(ofconn->packet_in_counter); | |
968 | rconn_packet_counter_destroy(ofconn->reply_counter); | |
969 | pktbuf_destroy(ofconn->pktbuf); | |
970 | free(ofconn); | |
971 | } | |
972 | ||
973 | /* Reconfigures 'ofconn' to match 'c'. 'ofconn' and 'c' must have the same | |
974 | * target. */ | |
975 | static void | |
976 | ofconn_reconfigure(struct ofconn *ofconn, const struct ofproto_controller *c) | |
977 | { | |
978 | int probe_interval; | |
979 | ||
980 | ofconn->band = c->band; | |
981 | ||
982 | rconn_set_max_backoff(ofconn->rconn, c->max_backoff); | |
983 | ||
984 | probe_interval = c->probe_interval ? MAX(c->probe_interval, 5) : 0; | |
985 | rconn_set_probe_interval(ofconn->rconn, probe_interval); | |
986 | ||
987 | ofconn_set_rate_limit(ofconn, c->rate_limit, c->burst_limit); | |
988 | } | |
989 | ||
7ee20df1 BP |
990 | /* Returns true if it makes sense for 'ofconn' to receive and process OpenFlow |
991 | * messages. */ | |
992 | static bool | |
993 | ofconn_may_recv(const struct ofconn *ofconn) | |
994 | { | |
995 | int count = rconn_packet_counter_read (ofconn->reply_counter); | |
996 | return (!ofconn->blocked || ofconn->retry) && count < OFCONN_REPLY_MAX; | |
997 | } | |
998 | ||
19a87e36 BP |
999 | static void |
1000 | ofconn_run(struct ofconn *ofconn, | |
7ee20df1 | 1001 | bool (*handle_openflow)(struct ofconn *, struct ofpbuf *ofp_msg)) |
19a87e36 BP |
1002 | { |
1003 | struct connmgr *mgr = ofconn->connmgr; | |
19a87e36 BP |
1004 | size_t i; |
1005 | ||
1006 | for (i = 0; i < N_SCHEDULERS; i++) { | |
1007 | pinsched_run(ofconn->schedulers[i], do_send_packet_in, ofconn); | |
1008 | } | |
1009 | ||
1010 | rconn_run(ofconn->rconn); | |
1011 | ||
7ee20df1 BP |
1012 | if (handle_openflow) { |
1013 | /* Limit the number of iterations to avoid starving other tasks. */ | |
1014 | for (i = 0; i < 50 && ofconn_may_recv(ofconn); i++) { | |
1015 | struct ofpbuf *of_msg; | |
1016 | ||
1017 | of_msg = (ofconn->blocked | |
1018 | ? ofconn->blocked | |
1019 | : rconn_recv(ofconn->rconn)); | |
19a87e36 BP |
1020 | if (!of_msg) { |
1021 | break; | |
1022 | } | |
1023 | if (mgr->fail_open) { | |
1024 | fail_open_maybe_recover(mgr->fail_open); | |
1025 | } | |
7ee20df1 BP |
1026 | |
1027 | if (handle_openflow(ofconn, of_msg)) { | |
1028 | ofpbuf_delete(of_msg); | |
1029 | ofconn->blocked = NULL; | |
1030 | } else { | |
1031 | ofconn->blocked = of_msg; | |
1032 | ofconn->retry = false; | |
1033 | } | |
19a87e36 BP |
1034 | } |
1035 | } | |
1036 | ||
1037 | if (!rconn_is_alive(ofconn->rconn)) { | |
1038 | ofconn_destroy(ofconn); | |
7ee20df1 BP |
1039 | } else if (!rconn_is_connected(ofconn->rconn)) { |
1040 | ofconn_flush(ofconn); | |
19a87e36 BP |
1041 | } |
1042 | } | |
1043 | ||
1044 | static void | |
7ee20df1 | 1045 | ofconn_wait(struct ofconn *ofconn, bool handling_openflow) |
19a87e36 BP |
1046 | { |
1047 | int i; | |
1048 | ||
1049 | for (i = 0; i < N_SCHEDULERS; i++) { | |
1050 | pinsched_wait(ofconn->schedulers[i]); | |
1051 | } | |
1052 | rconn_run_wait(ofconn->rconn); | |
7ee20df1 | 1053 | if (handling_openflow && ofconn_may_recv(ofconn)) { |
19a87e36 | 1054 | rconn_recv_wait(ofconn->rconn); |
19a87e36 BP |
1055 | } |
1056 | } | |
1057 | ||
1058 | /* Returns true if 'ofconn' should receive asynchronous messages. */ | |
1059 | static bool | |
1060 | ofconn_receives_async_msgs(const struct ofconn *ofconn) | |
1061 | { | |
1062 | if (!rconn_is_connected(ofconn->rconn)) { | |
1063 | return false; | |
1064 | } else if (ofconn->type == OFCONN_PRIMARY) { | |
1065 | /* Primary controllers always get asynchronous messages unless they | |
1066 | * have configured themselves as "slaves". */ | |
1067 | return ofconn->role != NX_ROLE_SLAVE; | |
1068 | } else { | |
1069 | /* Service connections don't get asynchronous messages unless they have | |
1070 | * explicitly asked for them by setting a nonzero miss send length. */ | |
1071 | return ofconn->miss_send_len > 0; | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | /* Returns a human-readable name for an OpenFlow connection between 'mgr' and | |
1076 | * 'target', suitable for use in log messages for identifying the connection. | |
1077 | * | |
1078 | * The name is dynamically allocated. The caller should free it (with free()) | |
1079 | * when it is no longer needed. */ | |
1080 | static char * | |
1081 | ofconn_make_name(const struct connmgr *mgr, const char *target) | |
1082 | { | |
1083 | return xasprintf("%s<->%s", mgr->name, target); | |
1084 | } | |
1085 | ||
1086 | static void | |
1087 | ofconn_set_rate_limit(struct ofconn *ofconn, int rate, int burst) | |
1088 | { | |
1089 | int i; | |
1090 | ||
1091 | for (i = 0; i < N_SCHEDULERS; i++) { | |
1092 | struct pinsched **s = &ofconn->schedulers[i]; | |
1093 | ||
1094 | if (rate > 0) { | |
1095 | if (!*s) { | |
1096 | *s = pinsched_create(rate, burst); | |
1097 | } else { | |
1098 | pinsched_set_limits(*s, rate, burst); | |
1099 | } | |
1100 | } else { | |
1101 | pinsched_destroy(*s); | |
1102 | *s = NULL; | |
1103 | } | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | static void | |
1108 | ofconn_send(const struct ofconn *ofconn, struct ofpbuf *msg, | |
1109 | struct rconn_packet_counter *counter) | |
1110 | { | |
1111 | update_openflow_length(msg); | |
1112 | if (rconn_send(ofconn->rconn, msg, counter)) { | |
1113 | ofpbuf_delete(msg); | |
1114 | } | |
1115 | } | |
1116 | \f | |
1117 | /* Sending asynchronous messages. */ | |
1118 | ||
78bd1cd0 | 1119 | static void schedule_packet_in(struct ofconn *, struct ofputil_packet_in, |
29ebe880 | 1120 | const struct flow *); |
19a87e36 BP |
1121 | |
1122 | /* Sends an OFPT_PORT_STATUS message with 'opp' and 'reason' to appropriate | |
9cfcdadf | 1123 | * controllers managed by 'mgr'. */ |
19a87e36 BP |
1124 | void |
1125 | connmgr_send_port_status(struct connmgr *mgr, const struct ofp_phy_port *opp, | |
1126 | uint8_t reason) | |
1127 | { | |
1128 | /* XXX Should limit the number of queued port status change messages. */ | |
1129 | struct ofconn *ofconn; | |
1130 | ||
1131 | LIST_FOR_EACH (ofconn, node, &mgr->all_conns) { | |
1132 | struct ofp_port_status *ops; | |
1133 | struct ofpbuf *b; | |
1134 | ||
1135 | /* Primary controllers, even slaves, should always get port status | |
1136 | updates. Otherwise obey ofconn_receives_async_msgs(). */ | |
1137 | if (ofconn->type != OFCONN_PRIMARY | |
1138 | && !ofconn_receives_async_msgs(ofconn)) { | |
1139 | continue; | |
1140 | } | |
1141 | ||
1142 | ops = make_openflow_xid(sizeof *ops, OFPT_PORT_STATUS, 0, &b); | |
1143 | ops->reason = reason; | |
1144 | ops->desc = *opp; | |
19a87e36 BP |
1145 | ofconn_send(ofconn, b, NULL); |
1146 | } | |
1147 | } | |
1148 | ||
1149 | /* Sends an OFPT_FLOW_REMOVED or NXT_FLOW_REMOVED message based on 'fr' to | |
1150 | * appropriate controllers managed by 'mgr'. */ | |
1151 | void | |
1152 | connmgr_send_flow_removed(struct connmgr *mgr, | |
1153 | const struct ofputil_flow_removed *fr) | |
1154 | { | |
1155 | struct ofconn *ofconn; | |
1156 | ||
1157 | LIST_FOR_EACH (ofconn, node, &mgr->all_conns) { | |
1158 | struct ofpbuf *msg; | |
1159 | ||
1160 | if (!ofconn_receives_async_msgs(ofconn)) { | |
1161 | continue; | |
1162 | } | |
1163 | ||
1164 | /* Account flow expirations as replies to OpenFlow requests. That | |
1165 | * works because preventing OpenFlow requests from being processed also | |
1166 | * prevents new flows from being added (and expiring). (It also | |
1167 | * prevents processing OpenFlow requests that would not add new flows, | |
1168 | * so it is imperfect.) */ | |
1169 | msg = ofputil_encode_flow_removed(fr, ofconn->flow_format); | |
1170 | ofconn_send_reply(ofconn, msg); | |
1171 | } | |
1172 | } | |
1173 | ||
78bd1cd0 | 1174 | /* Given 'pin', sends an OFPT_PACKET_IN message to each OpenFlow controller as |
29ebe880 | 1175 | * necessary according to their individual configurations. */ |
19a87e36 | 1176 | void |
78bd1cd0 BP |
1177 | connmgr_send_packet_in(struct connmgr *mgr, |
1178 | const struct ofputil_packet_in *pin, | |
29ebe880 | 1179 | const struct flow *flow) |
19a87e36 | 1180 | { |
29ebe880 | 1181 | struct ofconn *ofconn; |
19a87e36 | 1182 | |
19a87e36 BP |
1183 | LIST_FOR_EACH (ofconn, node, &mgr->all_conns) { |
1184 | if (ofconn_receives_async_msgs(ofconn)) { | |
29ebe880 | 1185 | schedule_packet_in(ofconn, *pin, flow); |
19a87e36 BP |
1186 | } |
1187 | } | |
19a87e36 BP |
1188 | } |
1189 | ||
1190 | /* pinsched callback for sending 'ofp_packet_in' on 'ofconn'. */ | |
1191 | static void | |
1192 | do_send_packet_in(struct ofpbuf *ofp_packet_in, void *ofconn_) | |
1193 | { | |
1194 | struct ofconn *ofconn = ofconn_; | |
1195 | ||
1196 | rconn_send_with_limit(ofconn->rconn, ofp_packet_in, | |
1197 | ofconn->packet_in_counter, 100); | |
1198 | } | |
1199 | ||
78bd1cd0 | 1200 | /* Takes 'pin', whose packet has the flow specified by 'flow', composes an |
19a87e36 | 1201 | * OpenFlow packet-in message from it, and passes it to 'ofconn''s packet |
29ebe880 | 1202 | * scheduler for sending. */ |
19a87e36 | 1203 | static void |
78bd1cd0 | 1204 | schedule_packet_in(struct ofconn *ofconn, struct ofputil_packet_in pin, |
29ebe880 | 1205 | const struct flow *flow) |
19a87e36 BP |
1206 | { |
1207 | struct connmgr *mgr = ofconn->connmgr; | |
19a87e36 BP |
1208 | |
1209 | /* Get OpenFlow buffer_id. */ | |
78bd1cd0 | 1210 | if (pin.reason == OFPR_ACTION) { |
19a87e36 BP |
1211 | pin.buffer_id = UINT32_MAX; |
1212 | } else if (mgr->fail_open && fail_open_is_active(mgr->fail_open)) { | |
1213 | pin.buffer_id = pktbuf_get_null(); | |
1214 | } else if (!ofconn->pktbuf) { | |
1215 | pin.buffer_id = UINT32_MAX; | |
1216 | } else { | |
3e3252fa EJ |
1217 | pin.buffer_id = pktbuf_save(ofconn->pktbuf, pin.packet, pin.packet_len, |
1218 | flow->in_port); | |
19a87e36 BP |
1219 | } |
1220 | ||
1221 | /* Figure out how much of the packet to send. */ | |
78bd1cd0 | 1222 | if (pin.reason == OFPR_NO_MATCH) { |
3e3252fa | 1223 | pin.send_len = pin.packet_len; |
78bd1cd0 BP |
1224 | } else { |
1225 | /* Caller should have initialized 'send_len' to 'max_len' specified in | |
1226 | * struct ofp_action_output. */ | |
1227 | } | |
19a87e36 BP |
1228 | if (pin.buffer_id != UINT32_MAX) { |
1229 | pin.send_len = MIN(pin.send_len, ofconn->miss_send_len); | |
1230 | } | |
19a87e36 BP |
1231 | |
1232 | /* Make OFPT_PACKET_IN and hand over to packet scheduler. It might | |
1233 | * immediately call into do_send_packet_in() or it might buffer it for a | |
1234 | * while (until a later call to pinsched_run()). */ | |
78bd1cd0 | 1235 | pinsched_send(ofconn->schedulers[pin.reason == OFPR_NO_MATCH ? 0 : 1], |
54834960 EJ |
1236 | flow->in_port, |
1237 | ofputil_encode_packet_in(&pin, ofconn->packet_in_format), | |
19a87e36 BP |
1238 | do_send_packet_in, ofconn); |
1239 | } | |
1240 | \f | |
1241 | /* Fail-open settings. */ | |
1242 | ||
1243 | /* Returns the failure handling mode (OFPROTO_FAIL_SECURE or | |
1244 | * OFPROTO_FAIL_STANDALONE) for 'mgr'. */ | |
1245 | enum ofproto_fail_mode | |
1246 | connmgr_get_fail_mode(const struct connmgr *mgr) | |
1247 | { | |
1248 | return mgr->fail_mode; | |
1249 | } | |
1250 | ||
1251 | /* Sets the failure handling mode for 'mgr' to 'fail_mode' (either | |
1252 | * OFPROTO_FAIL_SECURE or OFPROTO_FAIL_STANDALONE). */ | |
1253 | void | |
1254 | connmgr_set_fail_mode(struct connmgr *mgr, enum ofproto_fail_mode fail_mode) | |
1255 | { | |
08fd19f0 BP |
1256 | if (mgr->fail_mode != fail_mode) { |
1257 | mgr->fail_mode = fail_mode; | |
1258 | update_fail_open(mgr); | |
1259 | if (!connmgr_has_controllers(mgr)) { | |
1260 | ofproto_flush_flows(mgr->ofproto); | |
1261 | } | |
1262 | } | |
19a87e36 BP |
1263 | } |
1264 | \f | |
1265 | /* Fail-open implementation. */ | |
1266 | ||
1267 | /* Returns the longest probe interval among the primary controllers configured | |
1268 | * on 'mgr'. Returns 0 if there are no primary controllers. */ | |
1269 | int | |
1270 | connmgr_get_max_probe_interval(const struct connmgr *mgr) | |
1271 | { | |
1272 | const struct ofconn *ofconn; | |
1273 | int max_probe_interval; | |
1274 | ||
1275 | max_probe_interval = 0; | |
1276 | HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) { | |
1277 | int probe_interval = rconn_get_probe_interval(ofconn->rconn); | |
1278 | max_probe_interval = MAX(max_probe_interval, probe_interval); | |
1279 | } | |
1280 | return max_probe_interval; | |
1281 | } | |
1282 | ||
1283 | /* Returns the number of seconds for which all of 'mgr's primary controllers | |
1284 | * have been disconnected. Returns 0 if 'mgr' has no primary controllers. */ | |
1285 | int | |
1286 | connmgr_failure_duration(const struct connmgr *mgr) | |
1287 | { | |
1288 | const struct ofconn *ofconn; | |
1289 | int min_failure_duration; | |
1290 | ||
1291 | if (!connmgr_has_controllers(mgr)) { | |
1292 | return 0; | |
1293 | } | |
1294 | ||
1295 | min_failure_duration = INT_MAX; | |
1296 | HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) { | |
1297 | int failure_duration = rconn_failure_duration(ofconn->rconn); | |
1298 | min_failure_duration = MIN(min_failure_duration, failure_duration); | |
1299 | } | |
1300 | return min_failure_duration; | |
1301 | } | |
1302 | ||
1303 | /* Returns true if at least one primary controller is connected (regardless of | |
1304 | * whether those controllers are believed to have authenticated and accepted | |
1305 | * this switch), false if none of them are connected. */ | |
1306 | bool | |
1307 | connmgr_is_any_controller_connected(const struct connmgr *mgr) | |
1308 | { | |
1309 | const struct ofconn *ofconn; | |
1310 | ||
1311 | HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) { | |
1312 | if (rconn_is_connected(ofconn->rconn)) { | |
1313 | return true; | |
1314 | } | |
1315 | } | |
1316 | return false; | |
1317 | } | |
1318 | ||
1319 | /* Returns true if at least one primary controller is believed to have | |
1320 | * authenticated and accepted this switch, false otherwise. */ | |
1321 | bool | |
1322 | connmgr_is_any_controller_admitted(const struct connmgr *mgr) | |
1323 | { | |
1324 | const struct ofconn *ofconn; | |
1325 | ||
1326 | HMAP_FOR_EACH (ofconn, hmap_node, &mgr->controllers) { | |
1327 | if (rconn_is_admitted(ofconn->rconn)) { | |
1328 | return true; | |
1329 | } | |
1330 | } | |
1331 | return false; | |
1332 | } | |
1333 | ||
1334 | /* Sends 'packet' to each controller connected to 'mgr'. Takes ownership of | |
1335 | * 'packet'. */ | |
1336 | void | |
1337 | connmgr_broadcast(struct connmgr *mgr, struct ofpbuf *packet) | |
1338 | { | |
1339 | struct ofconn *ofconn, *prev; | |
1340 | ||
1341 | prev = NULL; | |
1342 | LIST_FOR_EACH (ofconn, node, &mgr->all_conns) { | |
1343 | if (prev) { | |
1344 | ofconn_send_reply(ofconn, ofpbuf_clone(packet)); | |
1345 | } | |
1346 | if (rconn_is_connected(ofconn->rconn)) { | |
1347 | prev = ofconn; | |
1348 | } | |
1349 | } | |
1350 | if (prev) { | |
2e2dd32b | 1351 | ofconn_send_reply(prev, packet); |
19a87e36 BP |
1352 | } else { |
1353 | ofpbuf_delete(packet); | |
1354 | } | |
1355 | } | |
1356 | \f | |
1357 | /* In-band configuration. */ | |
1358 | ||
1359 | static bool any_extras_changed(const struct connmgr *, | |
1360 | const struct sockaddr_in *extras, size_t n); | |
1361 | ||
1362 | /* Sets the 'n' TCP port addresses in 'extras' as ones to which 'mgr''s | |
1363 | * in-band control should guarantee access, in the same way that in-band | |
1364 | * control guarantees access to OpenFlow controllers. */ | |
1365 | void | |
1366 | connmgr_set_extra_in_band_remotes(struct connmgr *mgr, | |
1367 | const struct sockaddr_in *extras, size_t n) | |
1368 | { | |
1369 | if (!any_extras_changed(mgr, extras, n)) { | |
1370 | return; | |
1371 | } | |
1372 | ||
1373 | free(mgr->extra_in_band_remotes); | |
1374 | mgr->n_extra_remotes = n; | |
1375 | mgr->extra_in_band_remotes = xmemdup(extras, n * sizeof *extras); | |
1376 | ||
1377 | update_in_band_remotes(mgr); | |
1378 | } | |
1379 | ||
1380 | /* Sets the OpenFlow queue used by flows set up by in-band control on | |
1381 | * 'mgr' to 'queue_id'. If 'queue_id' is negative, then in-band control | |
1382 | * flows will use the default queue. */ | |
1383 | void | |
1384 | connmgr_set_in_band_queue(struct connmgr *mgr, int queue_id) | |
1385 | { | |
1386 | if (queue_id != mgr->in_band_queue) { | |
1387 | mgr->in_band_queue = queue_id; | |
1388 | update_in_band_remotes(mgr); | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | static bool | |
1393 | any_extras_changed(const struct connmgr *mgr, | |
1394 | const struct sockaddr_in *extras, size_t n) | |
1395 | { | |
1396 | size_t i; | |
1397 | ||
1398 | if (n != mgr->n_extra_remotes) { | |
1399 | return true; | |
1400 | } | |
1401 | ||
1402 | for (i = 0; i < n; i++) { | |
1403 | const struct sockaddr_in *old = &mgr->extra_in_band_remotes[i]; | |
1404 | const struct sockaddr_in *new = &extras[i]; | |
1405 | ||
1406 | if (old->sin_addr.s_addr != new->sin_addr.s_addr || | |
1407 | old->sin_port != new->sin_port) { | |
1408 | return true; | |
1409 | } | |
1410 | } | |
1411 | ||
1412 | return false; | |
1413 | } | |
1414 | \f | |
1415 | /* In-band implementation. */ | |
1416 | ||
1417 | bool | |
1418 | connmgr_msg_in_hook(struct connmgr *mgr, const struct flow *flow, | |
1419 | const struct ofpbuf *packet) | |
1420 | { | |
1421 | return mgr->in_band && in_band_msg_in_hook(mgr->in_band, flow, packet); | |
1422 | } | |
1423 | ||
1424 | bool | |
1425 | connmgr_may_set_up_flow(struct connmgr *mgr, const struct flow *flow, | |
1426 | const struct nlattr *odp_actions, | |
1427 | size_t actions_len) | |
1428 | { | |
1429 | return !mgr->in_band || in_band_rule_check(flow, odp_actions, actions_len); | |
1430 | } | |
1431 | \f | |
1432 | /* Fail-open and in-band implementation. */ | |
1433 | ||
1434 | /* Called by 'ofproto' after all flows have been flushed, to allow fail-open | |
7ee20df1 BP |
1435 | * and standalone mode to re-create their flows. |
1436 | * | |
1437 | * In-band control has more sophisticated code that manages flows itself. */ | |
19a87e36 BP |
1438 | void |
1439 | connmgr_flushed(struct connmgr *mgr) | |
1440 | { | |
19a87e36 BP |
1441 | if (mgr->fail_open) { |
1442 | fail_open_flushed(mgr->fail_open); | |
1443 | } | |
08fd19f0 BP |
1444 | |
1445 | /* If there are no controllers and we're in standalone mode, set up a flow | |
1446 | * that matches every packet and directs them to OFPP_NORMAL (which goes to | |
1447 | * us). Otherwise, the switch is in secure mode and we won't pass any | |
1448 | * traffic until a controller has been defined and it tells us to do so. */ | |
1449 | if (!connmgr_has_controllers(mgr) | |
1450 | && mgr->fail_mode == OFPROTO_FAIL_STANDALONE) { | |
1451 | union ofp_action action; | |
1452 | struct cls_rule rule; | |
1453 | ||
1454 | memset(&action, 0, sizeof action); | |
1455 | action.type = htons(OFPAT_OUTPUT); | |
1456 | action.output.len = htons(sizeof action); | |
1457 | action.output.port = htons(OFPP_NORMAL); | |
1458 | cls_rule_init_catchall(&rule, 0); | |
1459 | ofproto_add_flow(mgr->ofproto, &rule, &action, 1); | |
1460 | } | |
19a87e36 BP |
1461 | } |
1462 | \f | |
1463 | /* Creates a new ofservice for 'target' in 'mgr'. Returns 0 if successful, | |
1464 | * otherwise a positive errno value. | |
1465 | * | |
1466 | * ofservice_reconfigure() must be called to fully configure the new | |
1467 | * ofservice. */ | |
1468 | static int | |
1469 | ofservice_create(struct connmgr *mgr, const char *target) | |
1470 | { | |
1471 | struct ofservice *ofservice; | |
1472 | struct pvconn *pvconn; | |
1473 | int error; | |
1474 | ||
1475 | error = pvconn_open(target, &pvconn); | |
1476 | if (error) { | |
1477 | return error; | |
1478 | } | |
1479 | ||
1480 | ofservice = xzalloc(sizeof *ofservice); | |
1481 | hmap_insert(&mgr->services, &ofservice->node, hash_string(target, 0)); | |
1482 | ofservice->pvconn = pvconn; | |
1483 | ||
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | static void | |
1488 | ofservice_destroy(struct connmgr *mgr, struct ofservice *ofservice) | |
1489 | { | |
1490 | hmap_remove(&mgr->services, &ofservice->node); | |
1491 | pvconn_close(ofservice->pvconn); | |
1492 | free(ofservice); | |
1493 | } | |
1494 | ||
1495 | static void | |
1496 | ofservice_reconfigure(struct ofservice *ofservice, | |
1497 | const struct ofproto_controller *c) | |
1498 | { | |
1499 | ofservice->probe_interval = c->probe_interval; | |
1500 | ofservice->rate_limit = c->rate_limit; | |
1501 | ofservice->burst_limit = c->burst_limit; | |
1502 | } | |
1503 | ||
1504 | /* Finds and returns the ofservice within 'mgr' that has the given | |
1505 | * 'target', or a null pointer if none exists. */ | |
1506 | static struct ofservice * | |
1507 | ofservice_lookup(struct connmgr *mgr, const char *target) | |
1508 | { | |
1509 | struct ofservice *ofservice; | |
1510 | ||
1511 | HMAP_FOR_EACH_WITH_HASH (ofservice, node, hash_string(target, 0), | |
1512 | &mgr->services) { | |
1513 | if (!strcmp(pvconn_get_name(ofservice->pvconn), target)) { | |
1514 | return ofservice; | |
1515 | } | |
1516 | } | |
1517 | return NULL; | |
1518 | } |