Line data Source code
1 : /*
2 : * Zebra opaque message handler module
3 : * Copyright (c) 2020 Volta Networks, Inc.
4 : *
5 : * This program is free software; you can redistribute it and/or modify
6 : * it under the terms of the GNU General Public License as published by
7 : * the Free Software Foundation; either version 2 of the License, or
8 : * (at your option) any later version.
9 : *
10 : * This program is distributed in the hope that it will be useful, but
11 : * WITHOUT ANY WARRANTY; without even the implied warranty of
12 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 : * General Public License for more details.
14 : *
15 : * You should have received a copy of the GNU General Public License along
16 : * with this program; see the file COPYING; if not, write to the Free Software
17 : * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 : */
19 :
20 :
21 : #include <zebra.h>
22 : #include "lib/debug.h"
23 : #include "lib/frr_pthread.h"
24 : #include "lib/stream.h"
25 : #include "zebra/debug.h"
26 : #include "zebra/zserv.h"
27 : #include "zebra/zebra_opaque.h"
28 : #include "zebra/rib.h"
29 :
30 : /* Mem type */
31 6 : DEFINE_MTYPE_STATIC(ZEBRA, OPQ, "ZAPI Opaque Information");
32 :
33 : /* Hash to hold message registration info from zapi clients */
34 : PREDECL_HASH(opq_regh);
35 :
36 : /* Registered client info */
37 : struct opq_client_reg {
38 : int proto;
39 : int instance;
40 : uint32_t session_id;
41 :
42 : struct opq_client_reg *next;
43 : struct opq_client_reg *prev;
44 : };
45 :
46 : /* Opaque message registration info */
47 : struct opq_msg_reg {
48 : struct opq_regh_item item;
49 :
50 : /* Message type */
51 : uint32_t type;
52 :
53 : struct opq_client_reg *clients;
54 : };
55 :
56 : /* Registration helper prototypes */
57 : static uint32_t registration_hash(const struct opq_msg_reg *reg);
58 : static int registration_compare(const struct opq_msg_reg *reg1,
59 : const struct opq_msg_reg *reg2);
60 :
61 4 : DECLARE_HASH(opq_regh, struct opq_msg_reg, item, registration_compare,
62 : registration_hash);
63 :
64 : static struct opq_regh_head opq_reg_hash;
65 :
66 : /*
67 : * Globals
68 : */
69 : static struct zebra_opaque_globals {
70 :
71 : /* Sentinel for run or start of shutdown */
72 : _Atomic uint32_t run;
73 :
74 : /* Limit number of pending, unprocessed updates */
75 : _Atomic uint32_t max_queued_updates;
76 :
77 : /* Limit number of new messages dequeued at once, to pace an
78 : * incoming burst.
79 : */
80 : uint32_t msgs_per_cycle;
81 :
82 : /* Stats: counters of incoming messages, errors, and yields (when
83 : * the limit has been reached.)
84 : */
85 : _Atomic uint32_t msgs_in;
86 : _Atomic uint32_t msg_errors;
87 : _Atomic uint32_t yields;
88 :
89 : /* pthread */
90 : struct frr_pthread *pthread;
91 :
92 : /* Event-delivery context 'master' for the module */
93 : struct thread_master *master;
94 :
95 : /* Event/'thread' pointer for queued zapi messages */
96 : struct thread *t_msgs;
97 :
98 : /* Input fifo queue to the module, and lock to protect it. */
99 : pthread_mutex_t mutex;
100 : struct stream_fifo in_fifo;
101 :
102 : } zo_info;
103 :
104 : /* Name string for debugs/logs */
105 : static const char LOG_NAME[] = "Zebra Opaque";
106 :
107 : /* Prototypes */
108 :
109 : /* Main event loop, processing incoming message queue */
110 : static void process_messages(struct thread *event);
111 : static int handle_opq_registration(const struct zmsghdr *hdr,
112 : struct stream *msg);
113 : static int handle_opq_unregistration(const struct zmsghdr *hdr,
114 : struct stream *msg);
115 : static int dispatch_opq_messages(struct stream_fifo *msg_fifo);
116 : static struct opq_msg_reg *opq_reg_lookup(uint32_t type);
117 : static bool opq_client_match(const struct opq_client_reg *client,
118 : const struct zapi_opaque_reg_info *info);
119 : static struct opq_msg_reg *opq_reg_alloc(uint32_t type);
120 : static void opq_reg_free(struct opq_msg_reg **reg);
121 : static struct opq_client_reg *opq_client_alloc(
122 : const struct zapi_opaque_reg_info *info);
123 : static void opq_client_free(struct opq_client_reg **client);
124 : static const char *opq_client2str(char *buf, size_t buflen,
125 : const struct opq_client_reg *client);
126 :
127 : /*
128 : * Initialize the module at startup
129 : */
130 2 : void zebra_opaque_init(void)
131 : {
132 2 : memset(&zo_info, 0, sizeof(zo_info));
133 :
134 2 : pthread_mutex_init(&zo_info.mutex, NULL);
135 2 : stream_fifo_init(&zo_info.in_fifo);
136 :
137 2 : zo_info.msgs_per_cycle = ZEBRA_OPAQUE_MSG_LIMIT;
138 2 : }
139 :
140 : /*
141 : * Start the module pthread. This step is run later than the
142 : * 'init' step, in case zebra has fork-ed.
143 : */
144 2 : void zebra_opaque_start(void)
145 : {
146 2 : struct frr_pthread_attr pattr = {
147 2 : .start = frr_pthread_attr_default.start,
148 2 : .stop = frr_pthread_attr_default.stop
149 : };
150 :
151 2 : if (IS_ZEBRA_DEBUG_EVENT)
152 0 : zlog_debug("%s module starting", LOG_NAME);
153 :
154 : /* Start pthread */
155 2 : zo_info.pthread = frr_pthread_new(&pattr, "Zebra Opaque thread",
156 : "zebra_opaque");
157 :
158 : /* Associate event 'master' */
159 2 : zo_info.master = zo_info.pthread->master;
160 :
161 2 : atomic_store_explicit(&zo_info.run, 1, memory_order_relaxed);
162 :
163 : /* Enqueue an initial event for the pthread */
164 2 : thread_add_event(zo_info.master, process_messages, NULL, 0,
165 : &zo_info.t_msgs);
166 :
167 : /* And start the pthread */
168 2 : frr_pthread_run(zo_info.pthread, NULL);
169 2 : }
170 :
171 : /*
172 : * Module stop, halting the dedicated pthread; called from the main pthread.
173 : */
174 2 : void zebra_opaque_stop(void)
175 : {
176 2 : if (IS_ZEBRA_DEBUG_EVENT)
177 0 : zlog_debug("%s module stop", LOG_NAME);
178 :
179 2 : atomic_store_explicit(&zo_info.run, 0, memory_order_relaxed);
180 :
181 2 : frr_pthread_stop(zo_info.pthread, NULL);
182 :
183 2 : frr_pthread_destroy(zo_info.pthread);
184 :
185 2 : if (IS_ZEBRA_DEBUG_EVENT)
186 0 : zlog_debug("%s module stop complete", LOG_NAME);
187 2 : }
188 :
189 : /*
190 : * Module final cleanup, called from the zebra main pthread.
191 : */
192 2 : void zebra_opaque_finish(void)
193 : {
194 2 : struct opq_msg_reg *reg;
195 2 : struct opq_client_reg *client;
196 :
197 2 : if (IS_ZEBRA_DEBUG_EVENT)
198 0 : zlog_debug("%s module shutdown", LOG_NAME);
199 :
200 : /* Clear out registration info */
201 2 : while ((reg = opq_regh_pop(&opq_reg_hash)) != NULL) {
202 0 : client = reg->clients;
203 0 : while (client) {
204 0 : reg->clients = client->next;
205 0 : opq_client_free(&client);
206 0 : client = reg->clients;
207 : }
208 :
209 2 : opq_reg_free(®);
210 : }
211 :
212 2 : opq_regh_fini(&opq_reg_hash);
213 :
214 2 : pthread_mutex_destroy(&zo_info.mutex);
215 2 : stream_fifo_deinit(&zo_info.in_fifo);
216 2 : }
217 :
218 : /*
219 : * Does this module handle (intercept) the specified zapi message type?
220 : */
221 28 : bool zebra_opaque_handles_msgid(uint16_t id)
222 : {
223 28 : bool ret = false;
224 :
225 28 : switch (id) {
226 0 : case ZEBRA_OPAQUE_MESSAGE:
227 : case ZEBRA_OPAQUE_REGISTER:
228 : case ZEBRA_OPAQUE_UNREGISTER:
229 0 : ret = true;
230 0 : break;
231 : default:
232 : break;
233 : }
234 :
235 28 : return ret;
236 : }
237 :
238 : /*
239 : * Enqueue a batch of messages for processing - this is the public api
240 : * used from the zapi processing threads.
241 : */
242 0 : uint32_t zebra_opaque_enqueue_batch(struct stream_fifo *batch)
243 : {
244 0 : uint32_t counter = 0;
245 0 : struct stream *msg;
246 :
247 : /* Dequeue messages from the incoming batch, and save them
248 : * on the module fifo.
249 : */
250 0 : frr_with_mutex (&zo_info.mutex) {
251 0 : msg = stream_fifo_pop(batch);
252 0 : while (msg) {
253 0 : stream_fifo_push(&zo_info.in_fifo, msg);
254 0 : counter++;
255 0 : msg = stream_fifo_pop(batch);
256 : }
257 : }
258 :
259 : /* Schedule module pthread to process the batch */
260 0 : if (counter > 0) {
261 0 : if (IS_ZEBRA_DEBUG_RECV && IS_ZEBRA_DEBUG_DETAIL)
262 0 : zlog_debug("%s: received %u messages",
263 : __func__, counter);
264 0 : thread_add_event(zo_info.master, process_messages, NULL, 0,
265 : &zo_info.t_msgs);
266 : }
267 :
268 0 : return counter;
269 : }
270 :
271 : /*
272 : * Pthread event loop, process the incoming message queue.
273 : */
274 2 : static void process_messages(struct thread *event)
275 : {
276 2 : struct stream_fifo fifo;
277 2 : struct stream *msg;
278 2 : uint32_t i;
279 2 : bool need_resched = false;
280 :
281 2 : stream_fifo_init(&fifo);
282 :
283 : /* Check for zebra shutdown */
284 2 : if (atomic_load_explicit(&zo_info.run, memory_order_relaxed) == 0)
285 0 : goto done;
286 :
287 : /*
288 : * Dequeue some messages from the incoming queue, temporarily
289 : * save them on the local fifo
290 : */
291 4 : frr_with_mutex (&zo_info.mutex) {
292 :
293 2 : for (i = 0; i < zo_info.msgs_per_cycle; i++) {
294 2 : msg = stream_fifo_pop(&zo_info.in_fifo);
295 2 : if (msg == NULL)
296 : break;
297 :
298 0 : stream_fifo_push(&fifo, msg);
299 : }
300 :
301 : /*
302 : * We may need to reschedule, if there are still
303 : * queued messages
304 : */
305 2 : if (stream_fifo_head(&zo_info.in_fifo) != NULL)
306 0 : need_resched = true;
307 : }
308 :
309 : /* Update stats */
310 2 : atomic_fetch_add_explicit(&zo_info.msgs_in, i, memory_order_relaxed);
311 :
312 : /* Check for zebra shutdown */
313 2 : if (atomic_load_explicit(&zo_info.run, memory_order_relaxed) == 0) {
314 0 : need_resched = false;
315 0 : goto done;
316 : }
317 :
318 2 : if (IS_ZEBRA_DEBUG_RECV && IS_ZEBRA_DEBUG_DETAIL)
319 0 : zlog_debug("%s: processing %u messages", __func__, i);
320 :
321 : /*
322 : * Process the messages from the temporary fifo. We send the whole
323 : * fifo so that we can take advantage of batching internally. Note
324 : * that registration/deregistration messages are handled here also.
325 : */
326 2 : dispatch_opq_messages(&fifo);
327 :
328 2 : done:
329 :
330 2 : if (need_resched) {
331 0 : atomic_fetch_add_explicit(&zo_info.yields, 1,
332 : memory_order_relaxed);
333 0 : thread_add_event(zo_info.master, process_messages, NULL, 0,
334 : &zo_info.t_msgs);
335 : }
336 :
337 : /* This will also free any leftover messages, in the shutdown case */
338 2 : stream_fifo_deinit(&fifo);
339 2 : }
340 :
341 : /*
342 : * Process (dispatch) or drop opaque messages.
343 : */
344 2 : static int dispatch_opq_messages(struct stream_fifo *msg_fifo)
345 : {
346 2 : struct stream *msg, *dup;
347 2 : struct zmsghdr hdr;
348 2 : struct zapi_opaque_msg info;
349 2 : struct opq_msg_reg *reg;
350 2 : int ret;
351 2 : struct opq_client_reg *client;
352 2 : struct zserv *zclient;
353 2 : char buf[50];
354 :
355 2 : while ((msg = stream_fifo_pop(msg_fifo)) != NULL) {
356 0 : zapi_parse_header(msg, &hdr);
357 0 : hdr.length -= ZEBRA_HEADER_SIZE;
358 :
359 : /* Handle client registration messages */
360 0 : if (hdr.command == ZEBRA_OPAQUE_REGISTER) {
361 0 : handle_opq_registration(&hdr, msg);
362 0 : continue;
363 0 : } else if (hdr.command == ZEBRA_OPAQUE_UNREGISTER) {
364 0 : handle_opq_unregistration(&hdr, msg);
365 0 : continue;
366 : }
367 :
368 : /* We only process OPAQUE messages - drop anything else */
369 0 : if (hdr.command != ZEBRA_OPAQUE_MESSAGE)
370 0 : goto drop_it;
371 :
372 : /* Dispatch to any registered ZAPI client(s) */
373 :
374 : /* Extract subtype and flags */
375 0 : ret = zclient_opaque_decode(msg, &info);
376 0 : if (ret != 0)
377 0 : goto drop_it;
378 :
379 : /* Look up registered ZAPI client(s) */
380 0 : reg = opq_reg_lookup(info.type);
381 0 : if (reg == NULL) {
382 0 : if (IS_ZEBRA_DEBUG_RECV && IS_ZEBRA_DEBUG_DETAIL)
383 0 : zlog_debug("%s: no registrations for opaque type %u, flags %#x",
384 : __func__, info.type, info.flags);
385 0 : goto drop_it;
386 : }
387 :
388 : /* Reset read pointer, since we'll be re-sending message */
389 0 : stream_set_getp(msg, 0);
390 :
391 : /* Send a copy of the message to all registered clients */
392 0 : for (client = reg->clients; client; client = client->next) {
393 0 : dup = NULL;
394 :
395 0 : if (CHECK_FLAG(info.flags, ZAPI_OPAQUE_FLAG_UNICAST)) {
396 :
397 0 : if (client->proto != info.proto ||
398 0 : client->instance != info.instance ||
399 0 : client->session_id != info.session_id)
400 0 : continue;
401 :
402 0 : if (IS_ZEBRA_DEBUG_RECV &&
403 : IS_ZEBRA_DEBUG_DETAIL)
404 0 : zlog_debug("%s: found matching unicast client %s",
405 : __func__,
406 : opq_client2str(buf,
407 : sizeof(buf),
408 : client));
409 :
410 : } else {
411 : /* Copy message if more clients */
412 0 : if (client->next)
413 0 : dup = stream_dup(msg);
414 : }
415 :
416 : /*
417 : * TODO -- this isn't ideal: we're going through an
418 : * acquire/release cycle for each client for each
419 : * message. Replace this with a batching version.
420 : */
421 0 : zclient = zserv_acquire_client(client->proto,
422 0 : client->instance,
423 : client->session_id);
424 0 : if (zclient) {
425 0 : if (IS_ZEBRA_DEBUG_SEND &&
426 : IS_ZEBRA_DEBUG_DETAIL)
427 0 : zlog_debug("%s: sending %s to client %s",
428 : __func__,
429 : (dup ? "dup" : "msg"),
430 : opq_client2str(buf,
431 : sizeof(buf),
432 : client));
433 :
434 : /*
435 : * Sending a message actually means enqueuing
436 : * it for a zapi io pthread to send - so we
437 : * don't touch the message after this call.
438 : */
439 0 : zserv_send_message(zclient, dup ? dup : msg);
440 0 : if (dup)
441 0 : dup = NULL;
442 : else
443 0 : msg = NULL;
444 :
445 0 : zserv_release_client(zclient);
446 : } else {
447 0 : if (IS_ZEBRA_DEBUG_RECV &&
448 : IS_ZEBRA_DEBUG_DETAIL)
449 0 : zlog_debug("%s: type %u: no zclient for %s",
450 : __func__, info.type,
451 : opq_client2str(buf,
452 : sizeof(buf),
453 : client));
454 : /* Registered but gone? */
455 0 : if (dup)
456 0 : stream_free(dup);
457 : }
458 :
459 : /* If unicast, we're done */
460 0 : if (CHECK_FLAG(info.flags, ZAPI_OPAQUE_FLAG_UNICAST))
461 : break;
462 : }
463 :
464 0 : drop_it:
465 :
466 0 : if (msg)
467 0 : stream_free(msg);
468 : }
469 :
470 2 : return 0;
471 : }
472 :
473 : /*
474 : * Process a register/unregister message
475 : */
476 0 : static int handle_opq_registration(const struct zmsghdr *hdr,
477 : struct stream *msg)
478 : {
479 0 : int ret = 0;
480 0 : struct zapi_opaque_reg_info info;
481 0 : struct opq_client_reg *client;
482 0 : struct opq_msg_reg key, *reg;
483 0 : char buf[50];
484 :
485 0 : memset(&info, 0, sizeof(info));
486 :
487 0 : if (zapi_opaque_reg_decode(msg, &info) < 0) {
488 0 : ret = -1;
489 0 : goto done;
490 : }
491 :
492 0 : memset(&key, 0, sizeof(key));
493 :
494 0 : key.type = info.type;
495 :
496 0 : reg = opq_regh_find(&opq_reg_hash, &key);
497 0 : if (reg) {
498 : /* Look for dup client */
499 0 : for (client = reg->clients; client != NULL;
500 0 : client = client->next) {
501 0 : if (opq_client_match(client, &info))
502 : break;
503 : }
504 :
505 0 : if (client) {
506 : /* Oops - duplicate registration? */
507 0 : if (IS_ZEBRA_DEBUG_RECV)
508 0 : zlog_debug("%s: duplicate opq reg for client %s",
509 : __func__,
510 : opq_client2str(buf, sizeof(buf),
511 : client));
512 0 : goto done;
513 : }
514 :
515 0 : client = opq_client_alloc(&info);
516 :
517 0 : if (IS_ZEBRA_DEBUG_RECV)
518 0 : zlog_debug("%s: client %s registers for %u",
519 : __func__,
520 : opq_client2str(buf, sizeof(buf), client),
521 : info.type);
522 :
523 : /* Link client into registration */
524 0 : client->next = reg->clients;
525 0 : if (reg->clients)
526 0 : reg->clients->prev = client;
527 0 : reg->clients = client;
528 : } else {
529 : /*
530 : * No existing registrations - create one, add the
531 : * client, and add registration to hash.
532 : */
533 0 : reg = opq_reg_alloc(info.type);
534 0 : client = opq_client_alloc(&info);
535 :
536 0 : if (IS_ZEBRA_DEBUG_RECV)
537 0 : zlog_debug("%s: client %s registers for new reg %u",
538 : __func__,
539 : opq_client2str(buf, sizeof(buf), client),
540 : info.type);
541 :
542 0 : reg->clients = client;
543 :
544 0 : opq_regh_add(&opq_reg_hash, reg);
545 : }
546 :
547 0 : done:
548 :
549 0 : stream_free(msg);
550 0 : return ret;
551 : }
552 :
553 : /*
554 : * Process a register/unregister message
555 : */
556 0 : static int handle_opq_unregistration(const struct zmsghdr *hdr,
557 : struct stream *msg)
558 : {
559 0 : int ret = 0;
560 0 : struct zapi_opaque_reg_info info;
561 0 : struct opq_client_reg *client;
562 0 : struct opq_msg_reg key, *reg;
563 0 : char buf[50];
564 :
565 0 : memset(&info, 0, sizeof(info));
566 :
567 0 : if (zapi_opaque_reg_decode(msg, &info) < 0) {
568 0 : ret = -1;
569 0 : goto done;
570 : }
571 :
572 0 : memset(&key, 0, sizeof(key));
573 :
574 0 : key.type = info.type;
575 :
576 0 : reg = opq_regh_find(&opq_reg_hash, &key);
577 0 : if (reg == NULL) {
578 : /* Weird: unregister for unknown message? */
579 0 : if (IS_ZEBRA_DEBUG_RECV)
580 0 : zlog_debug("%s: unknown client %s/%u/%u unregisters for unknown type %u",
581 : __func__,
582 : zebra_route_string(info.proto),
583 : info.instance, info.session_id, info.type);
584 0 : goto done;
585 : }
586 :
587 : /* Look for client */
588 0 : for (client = reg->clients; client != NULL;
589 0 : client = client->next) {
590 0 : if (opq_client_match(client, &info))
591 : break;
592 : }
593 :
594 0 : if (client == NULL) {
595 : /* Oops - unregister for unknown client? */
596 0 : if (IS_ZEBRA_DEBUG_RECV)
597 0 : zlog_debug("%s: unknown client %s/%u/%u unregisters for %u",
598 : __func__, zebra_route_string(info.proto),
599 : info.instance, info.session_id, info.type);
600 0 : goto done;
601 : }
602 :
603 0 : if (IS_ZEBRA_DEBUG_RECV)
604 0 : zlog_debug("%s: client %s unregisters for %u",
605 : __func__, opq_client2str(buf, sizeof(buf), client),
606 : info.type);
607 :
608 0 : if (client->prev)
609 0 : client->prev->next = client->next;
610 0 : if (client->next)
611 0 : client->next->prev = client->prev;
612 0 : if (reg->clients == client)
613 0 : reg->clients = client->next;
614 :
615 0 : opq_client_free(&client);
616 :
617 : /* Is registration empty now? */
618 0 : if (reg->clients == NULL) {
619 0 : opq_regh_del(&opq_reg_hash, reg);
620 0 : opq_reg_free(®);
621 : }
622 :
623 0 : done:
624 :
625 0 : stream_free(msg);
626 0 : return ret;
627 : }
628 :
629 : /* Compare utility for registered clients */
630 0 : static bool opq_client_match(const struct opq_client_reg *client,
631 : const struct zapi_opaque_reg_info *info)
632 : {
633 0 : if (client->proto == info->proto &&
634 0 : client->instance == info->instance &&
635 0 : client->session_id == info->session_id)
636 : return true;
637 : else
638 0 : return false;
639 : }
640 :
641 0 : static struct opq_msg_reg *opq_reg_lookup(uint32_t type)
642 : {
643 0 : struct opq_msg_reg key, *reg;
644 :
645 0 : memset(&key, 0, sizeof(key));
646 :
647 0 : key.type = type;
648 :
649 0 : reg = opq_regh_find(&opq_reg_hash, &key);
650 :
651 0 : return reg;
652 : }
653 :
654 0 : static struct opq_msg_reg *opq_reg_alloc(uint32_t type)
655 : {
656 0 : struct opq_msg_reg *reg;
657 :
658 0 : reg = XCALLOC(MTYPE_OPQ, sizeof(struct opq_msg_reg));
659 :
660 0 : reg->type = type;
661 0 : INIT_HASH(®->item);
662 :
663 0 : return reg;
664 : }
665 :
666 0 : static void opq_reg_free(struct opq_msg_reg **reg)
667 : {
668 0 : XFREE(MTYPE_OPQ, (*reg));
669 0 : }
670 :
671 0 : static struct opq_client_reg *opq_client_alloc(
672 : const struct zapi_opaque_reg_info *info)
673 : {
674 0 : struct opq_client_reg *client;
675 :
676 0 : client = XCALLOC(MTYPE_OPQ, sizeof(struct opq_client_reg));
677 :
678 0 : client->proto = info->proto;
679 0 : client->instance = info->instance;
680 0 : client->session_id = info->session_id;
681 :
682 0 : return client;
683 : }
684 :
685 0 : static void opq_client_free(struct opq_client_reg **client)
686 : {
687 0 : XFREE(MTYPE_OPQ, (*client));
688 : }
689 :
690 0 : static const char *opq_client2str(char *buf, size_t buflen,
691 : const struct opq_client_reg *client)
692 : {
693 0 : char sbuf[20];
694 :
695 0 : snprintf(buf, buflen, "%s/%u", zebra_route_string(client->proto),
696 0 : client->instance);
697 0 : if (client->session_id > 0) {
698 0 : snprintf(sbuf, sizeof(sbuf), "/%u", client->session_id);
699 0 : strlcat(buf, sbuf, buflen);
700 : }
701 :
702 0 : return buf;
703 : }
704 :
705 : /* Hash function for clients registered for messages */
706 0 : static uint32_t registration_hash(const struct opq_msg_reg *reg)
707 : {
708 0 : return reg->type;
709 : }
710 :
711 : /* Comparison function for client registrations */
712 0 : static int registration_compare(const struct opq_msg_reg *reg1,
713 : const struct opq_msg_reg *reg2)
714 : {
715 0 : if (reg1->type == reg2->type)
716 : return 0;
717 : else
718 0 : return -1;
719 : }
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