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5adc2528 AS |
1 | /* |
2 | * Main implementation file for interface to Forwarding Plane Manager. | |
3 | * | |
4 | * Copyright (C) 2012 by Open Source Routing. | |
5 | * Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC") | |
6 | * | |
7 | * This file is part of GNU Zebra. | |
8 | * | |
9 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2, or (at your option) any | |
12 | * later version. | |
13 | * | |
14 | * GNU Zebra is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
21 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
22 | * 02111-1307, USA. | |
23 | */ | |
24 | ||
25 | #include <zebra.h> | |
26 | ||
27 | #include "log.h" | |
28 | #include "stream.h" | |
29 | #include "thread.h" | |
30 | #include "network.h" | |
31 | #include "command.h" | |
32 | ||
33 | #include "zebra/rib.h" | |
7c551956 DS |
34 | #include "zebra/zserv.h" |
35 | #include "zebra/zebra_ns.h" | |
36 | #include "zebra/zebra_vrf.h" | |
5adc2528 AS |
37 | |
38 | #include "fpm/fpm.h" | |
39 | #include "zebra_fpm.h" | |
40 | #include "zebra_fpm_private.h" | |
41 | ||
42 | /* | |
43 | * Interval at which we attempt to connect to the FPM. | |
44 | */ | |
45 | #define ZFPM_CONNECT_RETRY_IVL 5 | |
46 | ||
47 | /* | |
48 | * Sizes of outgoing and incoming stream buffers for writing/reading | |
49 | * FPM messages. | |
50 | */ | |
51 | #define ZFPM_OBUF_SIZE (2 * FPM_MAX_MSG_LEN) | |
52 | #define ZFPM_IBUF_SIZE (FPM_MAX_MSG_LEN) | |
53 | ||
54 | /* | |
55 | * The maximum number of times the FPM socket write callback can call | |
56 | * 'write' before it yields. | |
57 | */ | |
58 | #define ZFPM_MAX_WRITES_PER_RUN 10 | |
59 | ||
60 | /* | |
61 | * Interval over which we collect statistics. | |
62 | */ | |
63 | #define ZFPM_STATS_IVL_SECS 10 | |
64 | ||
65 | /* | |
66 | * Structure that holds state for iterating over all route_node | |
67 | * structures that are candidates for being communicated to the FPM. | |
68 | */ | |
69 | typedef struct zfpm_rnodes_iter_t_ | |
70 | { | |
71 | rib_tables_iter_t tables_iter; | |
72 | route_table_iter_t iter; | |
73 | } zfpm_rnodes_iter_t; | |
74 | ||
75 | /* | |
76 | * Statistics. | |
77 | */ | |
78 | typedef struct zfpm_stats_t_ { | |
79 | unsigned long connect_calls; | |
80 | unsigned long connect_no_sock; | |
81 | ||
82 | unsigned long read_cb_calls; | |
83 | ||
84 | unsigned long write_cb_calls; | |
85 | unsigned long write_calls; | |
86 | unsigned long partial_writes; | |
87 | unsigned long max_writes_hit; | |
88 | unsigned long t_write_yields; | |
89 | ||
90 | unsigned long nop_deletes_skipped; | |
91 | unsigned long route_adds; | |
92 | unsigned long route_dels; | |
93 | ||
94 | unsigned long updates_triggered; | |
95 | unsigned long redundant_triggers; | |
96 | unsigned long non_fpm_table_triggers; | |
97 | ||
98 | unsigned long dests_del_after_update; | |
99 | ||
100 | unsigned long t_conn_down_starts; | |
101 | unsigned long t_conn_down_dests_processed; | |
102 | unsigned long t_conn_down_yields; | |
103 | unsigned long t_conn_down_finishes; | |
104 | ||
105 | unsigned long t_conn_up_starts; | |
106 | unsigned long t_conn_up_dests_processed; | |
107 | unsigned long t_conn_up_yields; | |
108 | unsigned long t_conn_up_aborts; | |
109 | unsigned long t_conn_up_finishes; | |
110 | ||
111 | } zfpm_stats_t; | |
112 | ||
113 | /* | |
114 | * States for the FPM state machine. | |
115 | */ | |
116 | typedef enum { | |
117 | ||
118 | /* | |
119 | * In this state we are not yet ready to connect to the FPM. This | |
120 | * can happen when this module is disabled, or if we're cleaning up | |
121 | * after a connection has gone down. | |
122 | */ | |
123 | ZFPM_STATE_IDLE, | |
124 | ||
125 | /* | |
126 | * Ready to talk to the FPM and periodically trying to connect to | |
127 | * it. | |
128 | */ | |
129 | ZFPM_STATE_ACTIVE, | |
130 | ||
131 | /* | |
132 | * In the middle of bringing up a TCP connection. Specifically, | |
133 | * waiting for a connect() call to complete asynchronously. | |
134 | */ | |
135 | ZFPM_STATE_CONNECTING, | |
136 | ||
137 | /* | |
138 | * TCP connection to the FPM is up. | |
139 | */ | |
140 | ZFPM_STATE_ESTABLISHED | |
141 | ||
142 | } zfpm_state_t; | |
143 | ||
144 | /* | |
145 | * Globals. | |
146 | */ | |
147 | typedef struct zfpm_glob_t_ | |
148 | { | |
149 | ||
150 | /* | |
151 | * True if the FPM module has been enabled. | |
152 | */ | |
153 | int enabled; | |
154 | ||
155 | struct thread_master *master; | |
156 | ||
157 | zfpm_state_t state; | |
158 | ||
159 | /* | |
160 | * Port on which the FPM is running. | |
161 | */ | |
162 | int fpm_port; | |
163 | ||
164 | /* | |
165 | * List of rib_dest_t structures to be processed | |
166 | */ | |
167 | TAILQ_HEAD (zfpm_dest_q, rib_dest_t_) dest_q; | |
168 | ||
169 | /* | |
170 | * Stream socket to the FPM. | |
171 | */ | |
172 | int sock; | |
173 | ||
174 | /* | |
175 | * Buffers for messages to/from the FPM. | |
176 | */ | |
177 | struct stream *obuf; | |
178 | struct stream *ibuf; | |
179 | ||
180 | /* | |
181 | * Threads for I/O. | |
182 | */ | |
183 | struct thread *t_connect; | |
184 | struct thread *t_write; | |
185 | struct thread *t_read; | |
186 | ||
187 | /* | |
188 | * Thread to clean up after the TCP connection to the FPM goes down | |
189 | * and the state that belongs to it. | |
190 | */ | |
191 | struct thread *t_conn_down; | |
192 | ||
193 | struct { | |
194 | zfpm_rnodes_iter_t iter; | |
195 | } t_conn_down_state; | |
196 | ||
197 | /* | |
198 | * Thread to take actions once the TCP conn to the FPM comes up, and | |
199 | * the state that belongs to it. | |
200 | */ | |
201 | struct thread *t_conn_up; | |
202 | ||
203 | struct { | |
204 | zfpm_rnodes_iter_t iter; | |
205 | } t_conn_up_state; | |
206 | ||
207 | unsigned long connect_calls; | |
208 | time_t last_connect_call_time; | |
209 | ||
210 | /* | |
211 | * Stats from the start of the current statistics interval up to | |
212 | * now. These are the counters we typically update in the code. | |
213 | */ | |
214 | zfpm_stats_t stats; | |
215 | ||
216 | /* | |
217 | * Statistics that were gathered in the last collection interval. | |
218 | */ | |
219 | zfpm_stats_t last_ivl_stats; | |
220 | ||
221 | /* | |
222 | * Cumulative stats from the last clear to the start of the current | |
223 | * statistics interval. | |
224 | */ | |
225 | zfpm_stats_t cumulative_stats; | |
226 | ||
227 | /* | |
228 | * Stats interval timer. | |
229 | */ | |
230 | struct thread *t_stats; | |
231 | ||
232 | /* | |
233 | * If non-zero, the last time when statistics were cleared. | |
234 | */ | |
235 | time_t last_stats_clear_time; | |
236 | ||
237 | } zfpm_glob_t; | |
238 | ||
239 | static zfpm_glob_t zfpm_glob_space; | |
240 | static zfpm_glob_t *zfpm_g = &zfpm_glob_space; | |
241 | ||
242 | static int zfpm_read_cb (struct thread *thread); | |
243 | static int zfpm_write_cb (struct thread *thread); | |
244 | ||
245 | static void zfpm_set_state (zfpm_state_t state, const char *reason); | |
246 | static void zfpm_start_connect_timer (const char *reason); | |
247 | static void zfpm_start_stats_timer (void); | |
248 | ||
249 | /* | |
250 | * zfpm_thread_should_yield | |
251 | */ | |
252 | static inline int | |
253 | zfpm_thread_should_yield (struct thread *t) | |
254 | { | |
255 | return thread_should_yield (t); | |
256 | } | |
257 | ||
258 | /* | |
259 | * zfpm_state_to_str | |
260 | */ | |
261 | static const char * | |
262 | zfpm_state_to_str (zfpm_state_t state) | |
263 | { | |
264 | switch (state) | |
265 | { | |
266 | ||
267 | case ZFPM_STATE_IDLE: | |
268 | return "idle"; | |
269 | ||
270 | case ZFPM_STATE_ACTIVE: | |
271 | return "active"; | |
272 | ||
273 | case ZFPM_STATE_CONNECTING: | |
274 | return "connecting"; | |
275 | ||
276 | case ZFPM_STATE_ESTABLISHED: | |
277 | return "established"; | |
278 | ||
279 | default: | |
280 | return "unknown"; | |
281 | } | |
282 | } | |
283 | ||
284 | /* | |
285 | * zfpm_get_time | |
286 | */ | |
287 | static time_t | |
288 | zfpm_get_time (void) | |
289 | { | |
290 | struct timeval tv; | |
291 | ||
292 | if (quagga_gettime (QUAGGA_CLK_MONOTONIC, &tv) < 0) | |
293 | zlog_warn ("FPM: quagga_gettime failed!!"); | |
294 | ||
295 | return tv.tv_sec; | |
296 | } | |
297 | ||
298 | /* | |
299 | * zfpm_get_elapsed_time | |
300 | * | |
301 | * Returns the time elapsed (in seconds) since the given time. | |
302 | */ | |
303 | static time_t | |
304 | zfpm_get_elapsed_time (time_t reference) | |
305 | { | |
306 | time_t now; | |
307 | ||
308 | now = zfpm_get_time (); | |
309 | ||
310 | if (now < reference) | |
311 | { | |
312 | assert (0); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | return now - reference; | |
317 | } | |
318 | ||
319 | /* | |
320 | * zfpm_is_table_for_fpm | |
321 | * | |
322 | * Returns TRUE if the the given table is to be communicated to the | |
323 | * FPM. | |
324 | */ | |
325 | static inline int | |
326 | zfpm_is_table_for_fpm (struct route_table *table) | |
327 | { | |
328 | rib_table_info_t *info; | |
329 | ||
330 | info = rib_table_info (table); | |
331 | ||
332 | /* | |
333 | * We only send the unicast tables in the main instance to the FPM | |
334 | * at this point. | |
335 | */ | |
b72ede27 | 336 | if (info->zvrf->vrf_id != 0) |
5adc2528 AS |
337 | return 0; |
338 | ||
339 | if (info->safi != SAFI_UNICAST) | |
340 | return 0; | |
341 | ||
342 | return 1; | |
343 | } | |
344 | ||
345 | /* | |
346 | * zfpm_rnodes_iter_init | |
347 | */ | |
348 | static inline void | |
349 | zfpm_rnodes_iter_init (zfpm_rnodes_iter_t *iter) | |
350 | { | |
351 | memset (iter, 0, sizeof (*iter)); | |
352 | rib_tables_iter_init (&iter->tables_iter); | |
353 | ||
354 | /* | |
355 | * This is a hack, but it makes implementing 'next' easier by | |
356 | * ensuring that route_table_iter_next() will return NULL the first | |
357 | * time we call it. | |
358 | */ | |
359 | route_table_iter_init (&iter->iter, NULL); | |
360 | route_table_iter_cleanup (&iter->iter); | |
361 | } | |
362 | ||
363 | /* | |
364 | * zfpm_rnodes_iter_next | |
365 | */ | |
366 | static inline struct route_node * | |
367 | zfpm_rnodes_iter_next (zfpm_rnodes_iter_t *iter) | |
368 | { | |
369 | struct route_node *rn; | |
370 | struct route_table *table; | |
371 | ||
372 | while (1) | |
373 | { | |
374 | rn = route_table_iter_next (&iter->iter); | |
375 | if (rn) | |
376 | return rn; | |
377 | ||
378 | /* | |
379 | * We've made our way through this table, go to the next one. | |
380 | */ | |
381 | route_table_iter_cleanup (&iter->iter); | |
382 | ||
383 | while ((table = rib_tables_iter_next (&iter->tables_iter))) | |
384 | { | |
385 | if (zfpm_is_table_for_fpm (table)) | |
386 | break; | |
387 | } | |
388 | ||
389 | if (!table) | |
390 | return NULL; | |
391 | ||
392 | route_table_iter_init (&iter->iter, table); | |
393 | } | |
394 | ||
395 | return NULL; | |
396 | } | |
397 | ||
398 | /* | |
399 | * zfpm_rnodes_iter_pause | |
400 | */ | |
401 | static inline void | |
402 | zfpm_rnodes_iter_pause (zfpm_rnodes_iter_t *iter) | |
403 | { | |
404 | route_table_iter_pause (&iter->iter); | |
405 | } | |
406 | ||
407 | /* | |
408 | * zfpm_rnodes_iter_cleanup | |
409 | */ | |
410 | static inline void | |
411 | zfpm_rnodes_iter_cleanup (zfpm_rnodes_iter_t *iter) | |
412 | { | |
413 | route_table_iter_cleanup (&iter->iter); | |
414 | rib_tables_iter_cleanup (&iter->tables_iter); | |
415 | } | |
416 | ||
417 | /* | |
418 | * zfpm_stats_init | |
419 | * | |
420 | * Initialize a statistics block. | |
421 | */ | |
422 | static inline void | |
423 | zfpm_stats_init (zfpm_stats_t *stats) | |
424 | { | |
425 | memset (stats, 0, sizeof (*stats)); | |
426 | } | |
427 | ||
428 | /* | |
429 | * zfpm_stats_reset | |
430 | */ | |
431 | static inline void | |
432 | zfpm_stats_reset (zfpm_stats_t *stats) | |
433 | { | |
434 | zfpm_stats_init (stats); | |
435 | } | |
436 | ||
437 | /* | |
438 | * zfpm_stats_copy | |
439 | */ | |
440 | static inline void | |
441 | zfpm_stats_copy (const zfpm_stats_t *src, zfpm_stats_t *dest) | |
442 | { | |
443 | memcpy (dest, src, sizeof (*dest)); | |
444 | } | |
445 | ||
446 | /* | |
447 | * zfpm_stats_compose | |
448 | * | |
449 | * Total up the statistics in two stats structures ('s1 and 's2') and | |
450 | * return the result in the third argument, 'result'. Note that the | |
451 | * pointer 'result' may be the same as 's1' or 's2'. | |
452 | * | |
453 | * For simplicity, the implementation below assumes that the stats | |
454 | * structure is composed entirely of counters. This can easily be | |
455 | * changed when necessary. | |
456 | */ | |
457 | static void | |
458 | zfpm_stats_compose (const zfpm_stats_t *s1, const zfpm_stats_t *s2, | |
459 | zfpm_stats_t *result) | |
460 | { | |
461 | const unsigned long *p1, *p2; | |
462 | unsigned long *result_p; | |
463 | int i, num_counters; | |
464 | ||
465 | p1 = (const unsigned long *) s1; | |
466 | p2 = (const unsigned long *) s2; | |
467 | result_p = (unsigned long *) result; | |
468 | ||
469 | num_counters = (sizeof (zfpm_stats_t) / sizeof (unsigned long)); | |
470 | ||
471 | for (i = 0; i < num_counters; i++) | |
472 | { | |
473 | result_p[i] = p1[i] + p2[i]; | |
474 | } | |
475 | } | |
476 | ||
477 | /* | |
478 | * zfpm_read_on | |
479 | */ | |
480 | static inline void | |
481 | zfpm_read_on (void) | |
482 | { | |
483 | assert (!zfpm_g->t_read); | |
484 | assert (zfpm_g->sock >= 0); | |
485 | ||
486 | THREAD_READ_ON (zfpm_g->master, zfpm_g->t_read, zfpm_read_cb, 0, | |
487 | zfpm_g->sock); | |
488 | } | |
489 | ||
490 | /* | |
491 | * zfpm_write_on | |
492 | */ | |
493 | static inline void | |
494 | zfpm_write_on (void) | |
495 | { | |
496 | assert (!zfpm_g->t_write); | |
497 | assert (zfpm_g->sock >= 0); | |
498 | ||
499 | THREAD_WRITE_ON (zfpm_g->master, zfpm_g->t_write, zfpm_write_cb, 0, | |
500 | zfpm_g->sock); | |
501 | } | |
502 | ||
503 | /* | |
504 | * zfpm_read_off | |
505 | */ | |
506 | static inline void | |
507 | zfpm_read_off (void) | |
508 | { | |
509 | THREAD_READ_OFF (zfpm_g->t_read); | |
510 | } | |
511 | ||
512 | /* | |
513 | * zfpm_write_off | |
514 | */ | |
515 | static inline void | |
516 | zfpm_write_off (void) | |
517 | { | |
518 | THREAD_WRITE_OFF (zfpm_g->t_write); | |
519 | } | |
520 | ||
521 | /* | |
522 | * zfpm_conn_up_thread_cb | |
523 | * | |
524 | * Callback for actions to be taken when the connection to the FPM | |
525 | * comes up. | |
526 | */ | |
527 | static int | |
528 | zfpm_conn_up_thread_cb (struct thread *thread) | |
529 | { | |
530 | struct route_node *rnode; | |
531 | zfpm_rnodes_iter_t *iter; | |
532 | rib_dest_t *dest; | |
533 | ||
534 | assert (zfpm_g->t_conn_up); | |
535 | zfpm_g->t_conn_up = NULL; | |
536 | ||
537 | iter = &zfpm_g->t_conn_up_state.iter; | |
538 | ||
539 | if (zfpm_g->state != ZFPM_STATE_ESTABLISHED) | |
540 | { | |
541 | zfpm_debug ("Connection not up anymore, conn_up thread aborting"); | |
542 | zfpm_g->stats.t_conn_up_aborts++; | |
543 | goto done; | |
544 | } | |
545 | ||
546 | while ((rnode = zfpm_rnodes_iter_next (iter))) | |
547 | { | |
548 | dest = rib_dest_from_rnode (rnode); | |
549 | ||
550 | if (dest) | |
551 | { | |
552 | zfpm_g->stats.t_conn_up_dests_processed++; | |
553 | zfpm_trigger_update (rnode, NULL); | |
554 | } | |
555 | ||
556 | /* | |
557 | * Yield if need be. | |
558 | */ | |
559 | if (!zfpm_thread_should_yield (thread)) | |
560 | continue; | |
561 | ||
562 | zfpm_g->stats.t_conn_up_yields++; | |
563 | zfpm_rnodes_iter_pause (iter); | |
564 | zfpm_g->t_conn_up = thread_add_background (zfpm_g->master, | |
565 | zfpm_conn_up_thread_cb, | |
566 | 0, 0); | |
567 | return 0; | |
568 | } | |
569 | ||
570 | zfpm_g->stats.t_conn_up_finishes++; | |
571 | ||
572 | done: | |
573 | zfpm_rnodes_iter_cleanup (iter); | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /* | |
578 | * zfpm_connection_up | |
579 | * | |
580 | * Called when the connection to the FPM comes up. | |
581 | */ | |
582 | static void | |
583 | zfpm_connection_up (const char *detail) | |
584 | { | |
585 | assert (zfpm_g->sock >= 0); | |
586 | zfpm_read_on (); | |
587 | zfpm_write_on (); | |
588 | zfpm_set_state (ZFPM_STATE_ESTABLISHED, detail); | |
589 | ||
590 | /* | |
591 | * Start thread to push existing routes to the FPM. | |
592 | */ | |
593 | assert (!zfpm_g->t_conn_up); | |
594 | ||
595 | zfpm_rnodes_iter_init (&zfpm_g->t_conn_up_state.iter); | |
596 | ||
597 | zfpm_debug ("Starting conn_up thread"); | |
598 | zfpm_g->t_conn_up = thread_add_background (zfpm_g->master, | |
599 | zfpm_conn_up_thread_cb, 0, 0); | |
600 | zfpm_g->stats.t_conn_up_starts++; | |
601 | } | |
602 | ||
603 | /* | |
604 | * zfpm_connect_check | |
605 | * | |
606 | * Check if an asynchronous connect() to the FPM is complete. | |
607 | */ | |
608 | static void | |
35dece84 | 609 | zfpm_connect_check (void) |
5adc2528 AS |
610 | { |
611 | int status; | |
612 | socklen_t slen; | |
613 | int ret; | |
614 | ||
615 | zfpm_read_off (); | |
616 | zfpm_write_off (); | |
617 | ||
618 | slen = sizeof (status); | |
619 | ret = getsockopt (zfpm_g->sock, SOL_SOCKET, SO_ERROR, (void *) &status, | |
620 | &slen); | |
621 | ||
622 | if (ret >= 0 && status == 0) | |
623 | { | |
624 | zfpm_connection_up ("async connect complete"); | |
625 | return; | |
626 | } | |
627 | ||
628 | /* | |
629 | * getsockopt() failed or indicated an error on the socket. | |
630 | */ | |
631 | close (zfpm_g->sock); | |
632 | zfpm_g->sock = -1; | |
633 | ||
634 | zfpm_start_connect_timer ("getsockopt() after async connect failed"); | |
635 | return; | |
636 | } | |
637 | ||
638 | /* | |
639 | * zfpm_conn_down_thread_cb | |
640 | * | |
641 | * Callback that is invoked to clean up state after the TCP connection | |
642 | * to the FPM goes down. | |
643 | */ | |
644 | static int | |
645 | zfpm_conn_down_thread_cb (struct thread *thread) | |
646 | { | |
647 | struct route_node *rnode; | |
648 | zfpm_rnodes_iter_t *iter; | |
649 | rib_dest_t *dest; | |
650 | ||
651 | assert (zfpm_g->state == ZFPM_STATE_IDLE); | |
652 | ||
653 | assert (zfpm_g->t_conn_down); | |
654 | zfpm_g->t_conn_down = NULL; | |
655 | ||
656 | iter = &zfpm_g->t_conn_down_state.iter; | |
657 | ||
658 | while ((rnode = zfpm_rnodes_iter_next (iter))) | |
659 | { | |
660 | dest = rib_dest_from_rnode (rnode); | |
661 | ||
662 | if (dest) | |
663 | { | |
664 | if (CHECK_FLAG (dest->flags, RIB_DEST_UPDATE_FPM)) | |
665 | { | |
666 | TAILQ_REMOVE (&zfpm_g->dest_q, dest, fpm_q_entries); | |
667 | } | |
668 | ||
669 | UNSET_FLAG (dest->flags, RIB_DEST_UPDATE_FPM); | |
670 | UNSET_FLAG (dest->flags, RIB_DEST_SENT_TO_FPM); | |
671 | ||
672 | zfpm_g->stats.t_conn_down_dests_processed++; | |
673 | ||
674 | /* | |
675 | * Check if the dest should be deleted. | |
676 | */ | |
677 | rib_gc_dest(rnode); | |
678 | } | |
679 | ||
680 | /* | |
681 | * Yield if need be. | |
682 | */ | |
683 | if (!zfpm_thread_should_yield (thread)) | |
684 | continue; | |
685 | ||
686 | zfpm_g->stats.t_conn_down_yields++; | |
687 | zfpm_rnodes_iter_pause (iter); | |
688 | zfpm_g->t_conn_down = thread_add_background (zfpm_g->master, | |
689 | zfpm_conn_down_thread_cb, | |
690 | 0, 0); | |
691 | return 0; | |
692 | } | |
693 | ||
694 | zfpm_g->stats.t_conn_down_finishes++; | |
695 | zfpm_rnodes_iter_cleanup (iter); | |
696 | ||
697 | /* | |
698 | * Start the process of connecting to the FPM again. | |
699 | */ | |
700 | zfpm_start_connect_timer ("cleanup complete"); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | /* | |
705 | * zfpm_connection_down | |
706 | * | |
707 | * Called when the connection to the FPM has gone down. | |
708 | */ | |
709 | static void | |
710 | zfpm_connection_down (const char *detail) | |
711 | { | |
712 | if (!detail) | |
713 | detail = "unknown"; | |
714 | ||
715 | assert (zfpm_g->state == ZFPM_STATE_ESTABLISHED); | |
716 | ||
717 | zlog_info ("connection to the FPM has gone down: %s", detail); | |
718 | ||
719 | zfpm_read_off (); | |
720 | zfpm_write_off (); | |
721 | ||
722 | stream_reset (zfpm_g->ibuf); | |
723 | stream_reset (zfpm_g->obuf); | |
724 | ||
725 | if (zfpm_g->sock >= 0) { | |
726 | close (zfpm_g->sock); | |
727 | zfpm_g->sock = -1; | |
728 | } | |
729 | ||
730 | /* | |
731 | * Start thread to clean up state after the connection goes down. | |
732 | */ | |
733 | assert (!zfpm_g->t_conn_down); | |
734 | zfpm_debug ("Starting conn_down thread"); | |
735 | zfpm_rnodes_iter_init (&zfpm_g->t_conn_down_state.iter); | |
736 | zfpm_g->t_conn_down = thread_add_background (zfpm_g->master, | |
737 | zfpm_conn_down_thread_cb, 0, 0); | |
738 | zfpm_g->stats.t_conn_down_starts++; | |
739 | ||
740 | zfpm_set_state (ZFPM_STATE_IDLE, detail); | |
741 | } | |
742 | ||
743 | /* | |
744 | * zfpm_read_cb | |
745 | */ | |
746 | static int | |
747 | zfpm_read_cb (struct thread *thread) | |
748 | { | |
749 | size_t already; | |
750 | struct stream *ibuf; | |
751 | uint16_t msg_len; | |
752 | fpm_msg_hdr_t *hdr; | |
753 | ||
754 | zfpm_g->stats.read_cb_calls++; | |
755 | assert (zfpm_g->t_read); | |
756 | zfpm_g->t_read = NULL; | |
757 | ||
758 | /* | |
759 | * Check if async connect is now done. | |
760 | */ | |
761 | if (zfpm_g->state == ZFPM_STATE_CONNECTING) | |
762 | { | |
763 | zfpm_connect_check(); | |
764 | return 0; | |
765 | } | |
766 | ||
767 | assert (zfpm_g->state == ZFPM_STATE_ESTABLISHED); | |
768 | assert (zfpm_g->sock >= 0); | |
769 | ||
770 | ibuf = zfpm_g->ibuf; | |
771 | ||
772 | already = stream_get_endp (ibuf); | |
773 | if (already < FPM_MSG_HDR_LEN) | |
774 | { | |
775 | ssize_t nbyte; | |
776 | ||
777 | nbyte = stream_read_try (ibuf, zfpm_g->sock, FPM_MSG_HDR_LEN - already); | |
778 | if (nbyte == 0 || nbyte == -1) | |
779 | { | |
780 | zfpm_connection_down ("closed socket in read"); | |
781 | return 0; | |
782 | } | |
783 | ||
784 | if (nbyte != (ssize_t) (FPM_MSG_HDR_LEN - already)) | |
785 | goto done; | |
786 | ||
787 | already = FPM_MSG_HDR_LEN; | |
788 | } | |
789 | ||
790 | stream_set_getp (ibuf, 0); | |
791 | ||
792 | hdr = (fpm_msg_hdr_t *) stream_pnt (ibuf); | |
793 | ||
794 | if (!fpm_msg_hdr_ok (hdr)) | |
795 | { | |
796 | zfpm_connection_down ("invalid message header"); | |
797 | return 0; | |
798 | } | |
799 | ||
800 | msg_len = fpm_msg_len (hdr); | |
801 | ||
802 | /* | |
803 | * Read out the rest of the packet. | |
804 | */ | |
805 | if (already < msg_len) | |
806 | { | |
807 | ssize_t nbyte; | |
808 | ||
809 | nbyte = stream_read_try (ibuf, zfpm_g->sock, msg_len - already); | |
810 | ||
811 | if (nbyte == 0 || nbyte == -1) | |
812 | { | |
813 | zfpm_connection_down ("failed to read message"); | |
814 | return 0; | |
815 | } | |
816 | ||
817 | if (nbyte != (ssize_t) (msg_len - already)) | |
818 | goto done; | |
819 | } | |
820 | ||
821 | zfpm_debug ("Read out a full fpm message"); | |
822 | ||
823 | /* | |
824 | * Just throw it away for now. | |
825 | */ | |
826 | stream_reset (ibuf); | |
827 | ||
828 | done: | |
829 | zfpm_read_on (); | |
830 | return 0; | |
831 | } | |
832 | ||
833 | /* | |
834 | * zfpm_writes_pending | |
835 | * | |
836 | * Returns TRUE if we may have something to write to the FPM. | |
837 | */ | |
838 | static int | |
839 | zfpm_writes_pending (void) | |
840 | { | |
841 | ||
842 | /* | |
843 | * Check if there is any data in the outbound buffer that has not | |
844 | * been written to the socket yet. | |
845 | */ | |
846 | if (stream_get_endp (zfpm_g->obuf) - stream_get_getp (zfpm_g->obuf)) | |
847 | return 1; | |
848 | ||
849 | /* | |
850 | * Check if there are any prefixes on the outbound queue. | |
851 | */ | |
852 | if (!TAILQ_EMPTY (&zfpm_g->dest_q)) | |
853 | return 1; | |
854 | ||
855 | return 0; | |
856 | } | |
857 | ||
858 | /* | |
859 | * zfpm_encode_route | |
860 | * | |
861 | * Encode a message to the FPM with information about the given route. | |
862 | * | |
863 | * Returns the number of bytes written to the buffer. 0 or a negative | |
864 | * value indicates an error. | |
865 | */ | |
866 | static inline int | |
867 | zfpm_encode_route (rib_dest_t *dest, struct rib *rib, char *in_buf, | |
868 | size_t in_buf_len) | |
869 | { | |
870 | #ifndef HAVE_NETLINK | |
871 | return 0; | |
872 | #else | |
873 | ||
874 | int cmd; | |
875 | ||
876 | cmd = rib ? RTM_NEWROUTE : RTM_DELROUTE; | |
877 | ||
878 | return zfpm_netlink_encode_route (cmd, dest, rib, in_buf, in_buf_len); | |
879 | ||
880 | #endif /* HAVE_NETLINK */ | |
881 | } | |
882 | ||
883 | /* | |
884 | * zfpm_route_for_update | |
885 | * | |
886 | * Returns the rib that is to be sent to the FPM for a given dest. | |
887 | */ | |
888 | static struct rib * | |
889 | zfpm_route_for_update (rib_dest_t *dest) | |
890 | { | |
891 | struct rib *rib; | |
892 | ||
893 | RIB_DEST_FOREACH_ROUTE (dest, rib) | |
894 | { | |
895 | if (!CHECK_FLAG (rib->flags, ZEBRA_FLAG_SELECTED)) | |
896 | continue; | |
897 | ||
898 | return rib; | |
899 | } | |
900 | ||
901 | /* | |
902 | * We have no route for this destination. | |
903 | */ | |
904 | return NULL; | |
905 | } | |
906 | ||
907 | /* | |
908 | * zfpm_build_updates | |
909 | * | |
910 | * Process the outgoing queue and write messages to the outbound | |
911 | * buffer. | |
912 | */ | |
913 | static void | |
914 | zfpm_build_updates (void) | |
915 | { | |
916 | struct stream *s; | |
917 | rib_dest_t *dest; | |
918 | unsigned char *buf, *data, *buf_end; | |
919 | size_t msg_len; | |
920 | size_t data_len; | |
921 | fpm_msg_hdr_t *hdr; | |
922 | struct rib *rib; | |
923 | int is_add, write_msg; | |
924 | ||
925 | s = zfpm_g->obuf; | |
926 | ||
927 | assert (stream_empty (s)); | |
928 | ||
929 | do { | |
930 | ||
931 | /* | |
932 | * Make sure there is enough space to write another message. | |
933 | */ | |
934 | if (STREAM_WRITEABLE (s) < FPM_MAX_MSG_LEN) | |
935 | break; | |
936 | ||
937 | buf = STREAM_DATA (s) + stream_get_endp (s); | |
938 | buf_end = buf + STREAM_WRITEABLE (s); | |
939 | ||
940 | dest = TAILQ_FIRST (&zfpm_g->dest_q); | |
941 | if (!dest) | |
942 | break; | |
943 | ||
944 | assert (CHECK_FLAG (dest->flags, RIB_DEST_UPDATE_FPM)); | |
945 | ||
946 | hdr = (fpm_msg_hdr_t *) buf; | |
947 | hdr->version = FPM_PROTO_VERSION; | |
948 | hdr->msg_type = FPM_MSG_TYPE_NETLINK; | |
949 | ||
950 | data = fpm_msg_data (hdr); | |
951 | ||
952 | rib = zfpm_route_for_update (dest); | |
953 | is_add = rib ? 1 : 0; | |
954 | ||
955 | write_msg = 1; | |
956 | ||
957 | /* | |
958 | * If this is a route deletion, and we have not sent the route to | |
959 | * the FPM previously, skip it. | |
960 | */ | |
961 | if (!is_add && !CHECK_FLAG (dest->flags, RIB_DEST_SENT_TO_FPM)) | |
962 | { | |
963 | write_msg = 0; | |
964 | zfpm_g->stats.nop_deletes_skipped++; | |
965 | } | |
966 | ||
967 | if (write_msg) { | |
968 | data_len = zfpm_encode_route (dest, rib, (char *) data, buf_end - data); | |
969 | ||
970 | assert (data_len); | |
971 | if (data_len) | |
972 | { | |
973 | msg_len = fpm_data_len_to_msg_len (data_len); | |
974 | hdr->msg_len = htons (msg_len); | |
975 | stream_forward_endp (s, msg_len); | |
976 | ||
977 | if (is_add) | |
978 | zfpm_g->stats.route_adds++; | |
979 | else | |
980 | zfpm_g->stats.route_dels++; | |
981 | } | |
982 | } | |
983 | ||
984 | /* | |
985 | * Remove the dest from the queue, and reset the flag. | |
986 | */ | |
987 | UNSET_FLAG (dest->flags, RIB_DEST_UPDATE_FPM); | |
988 | TAILQ_REMOVE (&zfpm_g->dest_q, dest, fpm_q_entries); | |
989 | ||
990 | if (is_add) | |
991 | { | |
992 | SET_FLAG (dest->flags, RIB_DEST_SENT_TO_FPM); | |
993 | } | |
994 | else | |
995 | { | |
996 | UNSET_FLAG (dest->flags, RIB_DEST_SENT_TO_FPM); | |
997 | } | |
998 | ||
999 | /* | |
1000 | * Delete the destination if necessary. | |
1001 | */ | |
1002 | if (rib_gc_dest (dest->rnode)) | |
1003 | zfpm_g->stats.dests_del_after_update++; | |
1004 | ||
1005 | } while (1); | |
1006 | ||
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * zfpm_write_cb | |
1011 | */ | |
1012 | static int | |
1013 | zfpm_write_cb (struct thread *thread) | |
1014 | { | |
1015 | struct stream *s; | |
1016 | int num_writes; | |
1017 | ||
1018 | zfpm_g->stats.write_cb_calls++; | |
1019 | assert (zfpm_g->t_write); | |
1020 | zfpm_g->t_write = NULL; | |
1021 | ||
1022 | /* | |
1023 | * Check if async connect is now done. | |
1024 | */ | |
1025 | if (zfpm_g->state == ZFPM_STATE_CONNECTING) | |
1026 | { | |
1027 | zfpm_connect_check (); | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | assert (zfpm_g->state == ZFPM_STATE_ESTABLISHED); | |
1032 | assert (zfpm_g->sock >= 0); | |
1033 | ||
1034 | num_writes = 0; | |
1035 | ||
1036 | do | |
1037 | { | |
1038 | int bytes_to_write, bytes_written; | |
1039 | ||
1040 | s = zfpm_g->obuf; | |
1041 | ||
1042 | /* | |
1043 | * If the stream is empty, try fill it up with data. | |
1044 | */ | |
1045 | if (stream_empty (s)) | |
1046 | { | |
1047 | zfpm_build_updates (); | |
1048 | } | |
1049 | ||
1050 | bytes_to_write = stream_get_endp (s) - stream_get_getp (s); | |
1051 | if (!bytes_to_write) | |
1052 | break; | |
1053 | ||
1054 | bytes_written = write (zfpm_g->sock, STREAM_PNT (s), bytes_to_write); | |
1055 | zfpm_g->stats.write_calls++; | |
1056 | num_writes++; | |
1057 | ||
1058 | if (bytes_written < 0) | |
1059 | { | |
1060 | if (ERRNO_IO_RETRY (errno)) | |
1061 | break; | |
1062 | ||
1063 | zfpm_connection_down ("failed to write to socket"); | |
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | if (bytes_written != bytes_to_write) | |
1068 | { | |
1069 | ||
1070 | /* | |
1071 | * Partial write. | |
1072 | */ | |
1073 | stream_forward_getp (s, bytes_written); | |
1074 | zfpm_g->stats.partial_writes++; | |
1075 | break; | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * We've written out the entire contents of the stream. | |
1080 | */ | |
1081 | stream_reset (s); | |
1082 | ||
1083 | if (num_writes >= ZFPM_MAX_WRITES_PER_RUN) | |
1084 | { | |
1085 | zfpm_g->stats.max_writes_hit++; | |
1086 | break; | |
1087 | } | |
1088 | ||
1089 | if (zfpm_thread_should_yield (thread)) | |
1090 | { | |
1091 | zfpm_g->stats.t_write_yields++; | |
1092 | break; | |
1093 | } | |
1094 | } while (1); | |
1095 | ||
1096 | if (zfpm_writes_pending ()) | |
1097 | zfpm_write_on (); | |
1098 | ||
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * zfpm_connect_cb | |
1104 | */ | |
1105 | static int | |
1106 | zfpm_connect_cb (struct thread *t) | |
1107 | { | |
1108 | int sock, ret; | |
1109 | struct sockaddr_in serv; | |
1110 | ||
1111 | assert (zfpm_g->t_connect); | |
1112 | zfpm_g->t_connect = NULL; | |
1113 | assert (zfpm_g->state == ZFPM_STATE_ACTIVE); | |
1114 | ||
1115 | sock = socket (AF_INET, SOCK_STREAM, 0); | |
1116 | if (sock < 0) | |
1117 | { | |
1118 | zfpm_debug ("Failed to create socket for connect(): %s", strerror(errno)); | |
1119 | zfpm_g->stats.connect_no_sock++; | |
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | set_nonblocking(sock); | |
1124 | ||
1125 | /* Make server socket. */ | |
1126 | memset (&serv, 0, sizeof (serv)); | |
1127 | serv.sin_family = AF_INET; | |
1128 | serv.sin_port = htons (zfpm_g->fpm_port); | |
1129 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
1130 | serv.sin_len = sizeof (struct sockaddr_in); | |
1131 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
1132 | serv.sin_addr.s_addr = htonl (INADDR_LOOPBACK); | |
1133 | ||
1134 | /* | |
1135 | * Connect to the FPM. | |
1136 | */ | |
1137 | zfpm_g->connect_calls++; | |
1138 | zfpm_g->stats.connect_calls++; | |
1139 | zfpm_g->last_connect_call_time = zfpm_get_time (); | |
1140 | ||
1141 | ret = connect (sock, (struct sockaddr *) &serv, sizeof (serv)); | |
1142 | if (ret >= 0) | |
1143 | { | |
1144 | zfpm_g->sock = sock; | |
1145 | zfpm_connection_up ("connect succeeded"); | |
1146 | return 1; | |
1147 | } | |
1148 | ||
1149 | if (errno == EINPROGRESS) | |
1150 | { | |
1151 | zfpm_g->sock = sock; | |
1152 | zfpm_read_on (); | |
1153 | zfpm_write_on (); | |
1154 | zfpm_set_state (ZFPM_STATE_CONNECTING, "async connect in progress"); | |
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | zlog_info ("can't connect to FPM %d: %s", sock, safe_strerror (errno)); | |
1159 | close (sock); | |
1160 | ||
1161 | /* | |
1162 | * Restart timer for retrying connection. | |
1163 | */ | |
1164 | zfpm_start_connect_timer ("connect() failed"); | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * zfpm_set_state | |
1170 | * | |
1171 | * Move state machine into the given state. | |
1172 | */ | |
1173 | static void | |
1174 | zfpm_set_state (zfpm_state_t state, const char *reason) | |
1175 | { | |
1176 | zfpm_state_t cur_state = zfpm_g->state; | |
1177 | ||
1178 | if (!reason) | |
1179 | reason = "Unknown"; | |
1180 | ||
1181 | if (state == cur_state) | |
1182 | return; | |
1183 | ||
1184 | zfpm_debug("beginning state transition %s -> %s. Reason: %s", | |
1185 | zfpm_state_to_str (cur_state), zfpm_state_to_str (state), | |
1186 | reason); | |
1187 | ||
1188 | switch (state) { | |
1189 | ||
1190 | case ZFPM_STATE_IDLE: | |
1191 | assert (cur_state == ZFPM_STATE_ESTABLISHED); | |
1192 | break; | |
1193 | ||
1194 | case ZFPM_STATE_ACTIVE: | |
1195 | assert (cur_state == ZFPM_STATE_IDLE || | |
1196 | cur_state == ZFPM_STATE_CONNECTING); | |
1197 | assert (zfpm_g->t_connect); | |
1198 | break; | |
1199 | ||
1200 | case ZFPM_STATE_CONNECTING: | |
1201 | assert (zfpm_g->sock); | |
1202 | assert (cur_state == ZFPM_STATE_ACTIVE); | |
1203 | assert (zfpm_g->t_read); | |
1204 | assert (zfpm_g->t_write); | |
1205 | break; | |
1206 | ||
1207 | case ZFPM_STATE_ESTABLISHED: | |
1208 | assert (cur_state == ZFPM_STATE_ACTIVE || | |
1209 | cur_state == ZFPM_STATE_CONNECTING); | |
1210 | assert (zfpm_g->sock); | |
1211 | assert (zfpm_g->t_read); | |
1212 | assert (zfpm_g->t_write); | |
1213 | break; | |
1214 | } | |
1215 | ||
1216 | zfpm_g->state = state; | |
1217 | } | |
1218 | ||
1219 | /* | |
1220 | * zfpm_calc_connect_delay | |
1221 | * | |
1222 | * Returns the number of seconds after which we should attempt to | |
1223 | * reconnect to the FPM. | |
1224 | */ | |
1225 | static long | |
1226 | zfpm_calc_connect_delay (void) | |
1227 | { | |
1228 | time_t elapsed; | |
1229 | ||
1230 | /* | |
1231 | * Return 0 if this is our first attempt to connect. | |
1232 | */ | |
1233 | if (zfpm_g->connect_calls == 0) | |
1234 | { | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | elapsed = zfpm_get_elapsed_time (zfpm_g->last_connect_call_time); | |
1239 | ||
1240 | if (elapsed > ZFPM_CONNECT_RETRY_IVL) { | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | return ZFPM_CONNECT_RETRY_IVL - elapsed; | |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | * zfpm_start_connect_timer | |
1249 | */ | |
1250 | static void | |
1251 | zfpm_start_connect_timer (const char *reason) | |
1252 | { | |
1253 | long delay_secs; | |
1254 | ||
1255 | assert (!zfpm_g->t_connect); | |
1256 | assert (zfpm_g->sock < 0); | |
1257 | ||
1258 | assert(zfpm_g->state == ZFPM_STATE_IDLE || | |
1259 | zfpm_g->state == ZFPM_STATE_ACTIVE || | |
1260 | zfpm_g->state == ZFPM_STATE_CONNECTING); | |
1261 | ||
1262 | delay_secs = zfpm_calc_connect_delay(); | |
1263 | zfpm_debug ("scheduling connect in %ld seconds", delay_secs); | |
1264 | ||
1265 | THREAD_TIMER_ON (zfpm_g->master, zfpm_g->t_connect, zfpm_connect_cb, 0, | |
1266 | delay_secs); | |
1267 | zfpm_set_state (ZFPM_STATE_ACTIVE, reason); | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * zfpm_is_enabled | |
1272 | * | |
1273 | * Returns TRUE if the zebra FPM module has been enabled. | |
1274 | */ | |
1275 | static inline int | |
1276 | zfpm_is_enabled (void) | |
1277 | { | |
1278 | return zfpm_g->enabled; | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * zfpm_conn_is_up | |
1283 | * | |
1284 | * Returns TRUE if the connection to the FPM is up. | |
1285 | */ | |
1286 | static inline int | |
1287 | zfpm_conn_is_up (void) | |
1288 | { | |
1289 | if (zfpm_g->state != ZFPM_STATE_ESTABLISHED) | |
1290 | return 0; | |
1291 | ||
1292 | assert (zfpm_g->sock >= 0); | |
1293 | ||
1294 | return 1; | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * zfpm_trigger_update | |
1299 | * | |
1300 | * The zebra code invokes this function to indicate that we should | |
1301 | * send an update to the FPM about the given route_node. | |
1302 | */ | |
1303 | void | |
1304 | zfpm_trigger_update (struct route_node *rn, const char *reason) | |
1305 | { | |
1306 | rib_dest_t *dest; | |
1307 | char buf[INET6_ADDRSTRLEN]; | |
1308 | ||
1309 | /* | |
1310 | * Ignore if the connection is down. We will update the FPM about | |
1311 | * all destinations once the connection comes up. | |
1312 | */ | |
1313 | if (!zfpm_conn_is_up ()) | |
1314 | return; | |
1315 | ||
1316 | dest = rib_dest_from_rnode (rn); | |
1317 | ||
1318 | /* | |
1319 | * Ignore the trigger if the dest is not in a table that we would | |
1320 | * send to the FPM. | |
1321 | */ | |
1322 | if (!zfpm_is_table_for_fpm (rib_dest_table (dest))) | |
1323 | { | |
1324 | zfpm_g->stats.non_fpm_table_triggers++; | |
1325 | return; | |
1326 | } | |
1327 | ||
1328 | if (CHECK_FLAG (dest->flags, RIB_DEST_UPDATE_FPM)) { | |
1329 | zfpm_g->stats.redundant_triggers++; | |
1330 | return; | |
1331 | } | |
1332 | ||
1333 | if (reason) | |
1334 | { | |
1335 | zfpm_debug ("%s/%d triggering update to FPM - Reason: %s", | |
1336 | inet_ntop (rn->p.family, &rn->p.u.prefix, buf, sizeof (buf)), | |
1337 | rn->p.prefixlen, reason); | |
1338 | } | |
1339 | ||
1340 | SET_FLAG (dest->flags, RIB_DEST_UPDATE_FPM); | |
1341 | TAILQ_INSERT_TAIL (&zfpm_g->dest_q, dest, fpm_q_entries); | |
1342 | zfpm_g->stats.updates_triggered++; | |
1343 | ||
1344 | /* | |
1345 | * Make sure that writes are enabled. | |
1346 | */ | |
1347 | if (zfpm_g->t_write) | |
1348 | return; | |
1349 | ||
1350 | zfpm_write_on (); | |
1351 | } | |
1352 | ||
1353 | /* | |
1354 | * zfpm_stats_timer_cb | |
1355 | */ | |
1356 | static int | |
1357 | zfpm_stats_timer_cb (struct thread *t) | |
1358 | { | |
1359 | assert (zfpm_g->t_stats); | |
1360 | zfpm_g->t_stats = NULL; | |
1361 | ||
1362 | /* | |
1363 | * Remember the stats collected in the last interval for display | |
1364 | * purposes. | |
1365 | */ | |
1366 | zfpm_stats_copy (&zfpm_g->stats, &zfpm_g->last_ivl_stats); | |
1367 | ||
1368 | /* | |
1369 | * Add the current set of stats into the cumulative statistics. | |
1370 | */ | |
1371 | zfpm_stats_compose (&zfpm_g->cumulative_stats, &zfpm_g->stats, | |
1372 | &zfpm_g->cumulative_stats); | |
1373 | ||
1374 | /* | |
1375 | * Start collecting stats afresh over the next interval. | |
1376 | */ | |
1377 | zfpm_stats_reset (&zfpm_g->stats); | |
1378 | ||
1379 | zfpm_start_stats_timer (); | |
1380 | ||
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * zfpm_stop_stats_timer | |
1386 | */ | |
1387 | static void | |
1388 | zfpm_stop_stats_timer (void) | |
1389 | { | |
1390 | if (!zfpm_g->t_stats) | |
1391 | return; | |
1392 | ||
1393 | zfpm_debug ("Stopping existing stats timer"); | |
1394 | THREAD_TIMER_OFF (zfpm_g->t_stats); | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * zfpm_start_stats_timer | |
1399 | */ | |
1400 | void | |
1401 | zfpm_start_stats_timer (void) | |
1402 | { | |
1403 | assert (!zfpm_g->t_stats); | |
1404 | ||
1405 | THREAD_TIMER_ON (zfpm_g->master, zfpm_g->t_stats, zfpm_stats_timer_cb, 0, | |
1406 | ZFPM_STATS_IVL_SECS); | |
1407 | } | |
1408 | ||
1409 | /* | |
1410 | * Helper macro for zfpm_show_stats() below. | |
1411 | */ | |
1412 | #define ZFPM_SHOW_STAT(counter) \ | |
1413 | do { \ | |
1414 | vty_out (vty, "%-40s %10lu %16lu%s", #counter, total_stats.counter, \ | |
1415 | zfpm_g->last_ivl_stats.counter, VTY_NEWLINE); \ | |
1416 | } while (0) | |
1417 | ||
1418 | /* | |
1419 | * zfpm_show_stats | |
1420 | */ | |
1421 | static void | |
1422 | zfpm_show_stats (struct vty *vty) | |
1423 | { | |
1424 | zfpm_stats_t total_stats; | |
1425 | time_t elapsed; | |
1426 | ||
1427 | vty_out (vty, "%s%-40s %10s Last %2d secs%s%s", VTY_NEWLINE, "Counter", | |
1428 | "Total", ZFPM_STATS_IVL_SECS, VTY_NEWLINE, VTY_NEWLINE); | |
1429 | ||
1430 | /* | |
1431 | * Compute the total stats up to this instant. | |
1432 | */ | |
1433 | zfpm_stats_compose (&zfpm_g->cumulative_stats, &zfpm_g->stats, | |
1434 | &total_stats); | |
1435 | ||
1436 | ZFPM_SHOW_STAT (connect_calls); | |
1437 | ZFPM_SHOW_STAT (connect_no_sock); | |
1438 | ZFPM_SHOW_STAT (read_cb_calls); | |
1439 | ZFPM_SHOW_STAT (write_cb_calls); | |
1440 | ZFPM_SHOW_STAT (write_calls); | |
1441 | ZFPM_SHOW_STAT (partial_writes); | |
1442 | ZFPM_SHOW_STAT (max_writes_hit); | |
1443 | ZFPM_SHOW_STAT (t_write_yields); | |
1444 | ZFPM_SHOW_STAT (nop_deletes_skipped); | |
1445 | ZFPM_SHOW_STAT (route_adds); | |
1446 | ZFPM_SHOW_STAT (route_dels); | |
1447 | ZFPM_SHOW_STAT (updates_triggered); | |
1448 | ZFPM_SHOW_STAT (non_fpm_table_triggers); | |
1449 | ZFPM_SHOW_STAT (redundant_triggers); | |
1450 | ZFPM_SHOW_STAT (dests_del_after_update); | |
1451 | ZFPM_SHOW_STAT (t_conn_down_starts); | |
1452 | ZFPM_SHOW_STAT (t_conn_down_dests_processed); | |
1453 | ZFPM_SHOW_STAT (t_conn_down_yields); | |
1454 | ZFPM_SHOW_STAT (t_conn_down_finishes); | |
1455 | ZFPM_SHOW_STAT (t_conn_up_starts); | |
1456 | ZFPM_SHOW_STAT (t_conn_up_dests_processed); | |
1457 | ZFPM_SHOW_STAT (t_conn_up_yields); | |
1458 | ZFPM_SHOW_STAT (t_conn_up_aborts); | |
1459 | ZFPM_SHOW_STAT (t_conn_up_finishes); | |
1460 | ||
1461 | if (!zfpm_g->last_stats_clear_time) | |
1462 | return; | |
1463 | ||
1464 | elapsed = zfpm_get_elapsed_time (zfpm_g->last_stats_clear_time); | |
1465 | ||
1466 | vty_out (vty, "%sStats were cleared %lu seconds ago%s", VTY_NEWLINE, | |
1467 | (unsigned long) elapsed, VTY_NEWLINE); | |
1468 | } | |
1469 | ||
1470 | /* | |
1471 | * zfpm_clear_stats | |
1472 | */ | |
1473 | static void | |
1474 | zfpm_clear_stats (struct vty *vty) | |
1475 | { | |
1476 | if (!zfpm_is_enabled ()) | |
1477 | { | |
1478 | vty_out (vty, "The FPM module is not enabled...%s", VTY_NEWLINE); | |
1479 | return; | |
1480 | } | |
1481 | ||
1482 | zfpm_stats_reset (&zfpm_g->stats); | |
1483 | zfpm_stats_reset (&zfpm_g->last_ivl_stats); | |
1484 | zfpm_stats_reset (&zfpm_g->cumulative_stats); | |
1485 | ||
1486 | zfpm_stop_stats_timer (); | |
1487 | zfpm_start_stats_timer (); | |
1488 | ||
1489 | zfpm_g->last_stats_clear_time = zfpm_get_time(); | |
1490 | ||
1491 | vty_out (vty, "Cleared FPM stats%s", VTY_NEWLINE); | |
1492 | } | |
1493 | ||
1494 | /* | |
1495 | * show_zebra_fpm_stats | |
1496 | */ | |
1497 | DEFUN (show_zebra_fpm_stats, | |
1498 | show_zebra_fpm_stats_cmd, | |
1499 | "show zebra fpm stats", | |
1500 | SHOW_STR | |
1501 | "Zebra information\n" | |
1502 | "Forwarding Path Manager information\n" | |
1503 | "Statistics\n") | |
1504 | { | |
1505 | zfpm_show_stats (vty); | |
1506 | return CMD_SUCCESS; | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * clear_zebra_fpm_stats | |
1511 | */ | |
1512 | DEFUN (clear_zebra_fpm_stats, | |
1513 | clear_zebra_fpm_stats_cmd, | |
1514 | "clear zebra fpm stats", | |
1515 | CLEAR_STR | |
1516 | "Zebra information\n" | |
1517 | "Clear Forwarding Path Manager information\n" | |
1518 | "Statistics\n") | |
1519 | { | |
1520 | zfpm_clear_stats (vty); | |
1521 | return CMD_SUCCESS; | |
1522 | } | |
1523 | ||
1524 | /** | |
1525 | * zfpm_init | |
1526 | * | |
1527 | * One-time initialization of the Zebra FPM module. | |
1528 | * | |
1529 | * @param[in] port port at which FPM is running. | |
1530 | * @param[in] enable TRUE if the zebra FPM module should be enabled | |
1531 | * | |
1532 | * Returns TRUE on success. | |
1533 | */ | |
1534 | int | |
1535 | zfpm_init (struct thread_master *master, int enable, uint16_t port) | |
1536 | { | |
1537 | static int initialized = 0; | |
1538 | ||
1539 | if (initialized) { | |
1540 | return 1; | |
1541 | } | |
1542 | ||
1543 | initialized = 1; | |
1544 | ||
1545 | memset (zfpm_g, 0, sizeof (*zfpm_g)); | |
1546 | zfpm_g->master = master; | |
1547 | TAILQ_INIT(&zfpm_g->dest_q); | |
1548 | zfpm_g->sock = -1; | |
1549 | zfpm_g->state = ZFPM_STATE_IDLE; | |
1550 | ||
1551 | /* | |
1552 | * Netlink must currently be available for the Zebra-FPM interface | |
1553 | * to be enabled. | |
1554 | */ | |
1555 | #ifndef HAVE_NETLINK | |
1556 | enable = 0; | |
1557 | #endif | |
1558 | ||
1559 | zfpm_g->enabled = enable; | |
1560 | ||
1561 | zfpm_stats_init (&zfpm_g->stats); | |
1562 | zfpm_stats_init (&zfpm_g->last_ivl_stats); | |
1563 | zfpm_stats_init (&zfpm_g->cumulative_stats); | |
1564 | ||
1565 | install_element (ENABLE_NODE, &show_zebra_fpm_stats_cmd); | |
1566 | install_element (ENABLE_NODE, &clear_zebra_fpm_stats_cmd); | |
1567 | ||
1568 | if (!enable) { | |
1569 | return 1; | |
1570 | } | |
1571 | ||
1572 | if (!port) | |
1573 | port = FPM_DEFAULT_PORT; | |
1574 | ||
1575 | zfpm_g->fpm_port = port; | |
1576 | ||
1577 | zfpm_g->obuf = stream_new (ZFPM_OBUF_SIZE); | |
1578 | zfpm_g->ibuf = stream_new (ZFPM_IBUF_SIZE); | |
1579 | ||
1580 | zfpm_start_stats_timer (); | |
1581 | zfpm_start_connect_timer ("initialized"); | |
1582 | ||
1583 | return 1; | |
1584 | } |