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230aefe2 RZ |
1 | /* |
2 | * BFD data plane implementation (distributed BFD). | |
3 | * | |
4 | * Copyright (C) 2020 Network Device Education Foundation, Inc. ("NetDEF") | |
5 | * Rafael Zalamena | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include <netinet/in.h> | |
6655b43d | 25 | #include <netinet/tcp.h> |
230aefe2 RZ |
26 | #include <sys/socket.h> |
27 | #include <sys/un.h> | |
28 | ||
29 | #ifdef __FreeBSD__ | |
30 | #include <sys/endian.h> | |
31 | #else | |
32 | #include <endian.h> | |
33 | #endif /* __FreeBSD__ */ | |
34 | ||
35 | #include <errno.h> | |
36 | #include <time.h> | |
37 | ||
38 | #include "lib/hook.h" | |
6655b43d | 39 | #include "lib/network.h" |
230aefe2 RZ |
40 | #include "lib/printfrr.h" |
41 | #include "lib/stream.h" | |
42 | #include "lib/thread.h" | |
43 | ||
44 | #include "bfd.h" | |
45 | #include "bfddp_packet.h" | |
46 | ||
47 | #include "lib/openbsd-queue.h" | |
48 | ||
49 | DEFINE_MTYPE_STATIC(BFDD, BFDD_DPLANE_CTX, "Data plane client allocated memory") | |
50 | ||
51 | /** Data plane client socket buffer size. */ | |
52 | #define BFD_DPLANE_CLIENT_BUF_SIZE 8192 | |
53 | ||
54 | struct bfd_dplane_ctx { | |
55 | /** Client file descriptor. */ | |
56 | int sock; | |
6655b43d RZ |
57 | /** Is this a connected or accepted? */ |
58 | bool client; | |
59 | /** Is the socket still connecting? */ | |
60 | bool connecting; | |
61 | /** Client/server address. */ | |
62 | union { | |
63 | struct sockaddr sa; | |
64 | struct sockaddr_in sin; | |
65 | struct sockaddr_in6 sin6; | |
66 | struct sockaddr_un sun; | |
67 | } addr; | |
68 | /** Address length. */ | |
69 | socklen_t addrlen; | |
230aefe2 RZ |
70 | /** Data plane current last used ID. */ |
71 | uint16_t last_id; | |
72 | ||
73 | /** Input buffer data. */ | |
74 | struct stream *inbuf; | |
75 | /** Output buffer data. */ | |
76 | struct stream *outbuf; | |
77 | /** Input event data. */ | |
78 | struct thread *inbufev; | |
79 | /** Output event data. */ | |
80 | struct thread *outbufev; | |
6655b43d RZ |
81 | /** Connection event. */ |
82 | struct thread *connectev; | |
230aefe2 RZ |
83 | |
84 | /** Amount of bytes read. */ | |
85 | uint64_t in_bytes; | |
86 | /** Amount of bytes read peak. */ | |
87 | uint64_t in_bytes_peak; | |
88 | /** Amount of bytes written. */ | |
89 | uint64_t out_bytes; | |
90 | /** Amount of bytes written peak. */ | |
91 | uint64_t out_bytes_peak; | |
92 | /** Amount of output buffer full events (`bfd_dplane_enqueue` failed). | |
93 | */ | |
94 | uint64_t out_fullev; | |
95 | ||
96 | /** Amount of messages read (full messages). */ | |
97 | uint64_t in_msgs; | |
98 | /** Amount of messages enqueued (maybe written). */ | |
99 | uint64_t out_msgs; | |
100 | ||
101 | TAILQ_ENTRY(bfd_dplane_ctx) entry; | |
102 | }; | |
103 | ||
104 | /** | |
105 | * Callback type for `bfd_dplane_expect`. \see bfd_dplane_expect. | |
106 | */ | |
107 | typedef void (*bfd_dplane_expect_cb)(struct bfddp_message *msg, void *arg); | |
108 | ||
6655b43d RZ |
109 | static int bfd_dplane_client_connect(struct thread *t); |
110 | static bool bfd_dplane_client_connecting(struct bfd_dplane_ctx *bdc); | |
230aefe2 | 111 | static void bfd_dplane_ctx_free(struct bfd_dplane_ctx *bdc); |
efd04d60 RZ |
112 | static int _bfd_dplane_add_session(struct bfd_dplane_ctx *bdc, |
113 | struct bfd_session *bs); | |
230aefe2 RZ |
114 | |
115 | /* | |
116 | * BFD data plane helper functions. | |
117 | */ | |
118 | static const char *bfd_dplane_messagetype2str(enum bfddp_message_type bmt) | |
119 | { | |
120 | switch (bmt) { | |
121 | case ECHO_REQUEST: | |
122 | return "ECHO_REQUEST"; | |
123 | case ECHO_REPLY: | |
124 | return "ECHO_REPLY"; | |
125 | case DP_ADD_SESSION: | |
126 | return "DP_ADD_SESSION"; | |
127 | case DP_DELETE_SESSION: | |
128 | return "DP_DELETE_SESSION"; | |
129 | case BFD_STATE_CHANGE: | |
130 | return "BFD_STATE_CHANGE"; | |
131 | case DP_REQUEST_SESSION_COUNTERS: | |
132 | return "DP_REQUEST_SESSION_COUNTERS"; | |
133 | case BFD_SESSION_COUNTERS: | |
134 | return "BFD_SESSION_COUNTERS"; | |
135 | default: | |
136 | return "UNKNOWN"; | |
137 | } | |
138 | } | |
139 | ||
140 | static void bfd_dplane_debug_message(const struct bfddp_message *msg) | |
141 | { | |
142 | enum bfddp_message_type bmt; | |
143 | char buf[256], addrs[256]; | |
144 | uint32_t flags; | |
145 | int rv; | |
146 | ||
147 | if (!bglobal.debug_dplane) | |
148 | return; | |
149 | ||
150 | bmt = ntohs(msg->header.type); | |
151 | zlog_debug("dplane-packet: [version=%d length=%d type=%s (%d)]", | |
152 | msg->header.version, ntohs(msg->header.length), | |
153 | bfd_dplane_messagetype2str(bmt), bmt); | |
154 | ||
155 | switch (bmt) { | |
156 | case ECHO_REPLY: | |
157 | case ECHO_REQUEST: | |
158 | zlog_debug(" [dp_time=%" PRIu64 " bfdd_time=%" PRIu64 "]", | |
159 | (uint64_t)be64toh(msg->data.echo.dp_time), | |
160 | (uint64_t)be64toh(msg->data.echo.bfdd_time)); | |
161 | break; | |
162 | ||
163 | case DP_ADD_SESSION: | |
164 | case DP_DELETE_SESSION: | |
165 | flags = ntohl(msg->data.session.flags); | |
166 | if (flags & SESSION_IPV6) | |
167 | snprintfrr(addrs, sizeof(addrs), "src=%pI6 dst=%pI6", | |
168 | &msg->data.session.src, | |
169 | &msg->data.session.dst); | |
170 | else | |
171 | snprintfrr(addrs, sizeof(addrs), "src=%pI4 dst=%pI4", | |
172 | &msg->data.session.src, | |
173 | &msg->data.session.dst); | |
174 | ||
175 | buf[0] = 0; | |
176 | if (flags & SESSION_CBIT) | |
177 | strlcat(buf, "cpi ", sizeof(buf)); | |
178 | if (flags & SESSION_ECHO) | |
179 | strlcat(buf, "echo ", sizeof(buf)); | |
180 | if (flags & SESSION_IPV6) | |
181 | strlcat(buf, "ipv6 ", sizeof(buf)); | |
182 | if (flags & SESSION_DEMAND) | |
183 | strlcat(buf, "demand ", sizeof(buf)); | |
184 | if (flags & SESSION_PASSIVE) | |
185 | strlcat(buf, "passive ", sizeof(buf)); | |
186 | if (flags & SESSION_MULTIHOP) | |
187 | strlcat(buf, "multihop ", sizeof(buf)); | |
188 | if (flags & SESSION_SHUTDOWN) | |
189 | strlcat(buf, "shutdown ", sizeof(buf)); | |
190 | ||
191 | /* Remove the last space to make things prettier. */ | |
192 | rv = (int)strlen(buf); | |
193 | if (rv > 0) | |
194 | buf[rv - 1] = 0; | |
195 | ||
196 | zlog_debug( | |
197 | " [flags=0x%08x{%s} %s ttl=%d detect_mult=%d " | |
198 | "ifindex=%d ifname=%s]", | |
199 | flags, buf, addrs, msg->data.session.ttl, | |
200 | msg->data.session.detect_mult, | |
201 | ntohl(msg->data.session.ifindex), | |
202 | msg->data.session.ifname); | |
203 | break; | |
204 | ||
205 | case BFD_STATE_CHANGE: | |
206 | buf[0] = 0; | |
207 | flags = ntohl(msg->data.state.remote_flags); | |
208 | if (flags & RBIT_CPI) | |
209 | strlcat(buf, "cbit ", sizeof(buf)); | |
210 | if (flags & RBIT_DEMAND) | |
211 | strlcat(buf, "demand ", sizeof(buf)); | |
212 | if (flags & RBIT_MP) | |
213 | strlcat(buf, "mp ", sizeof(buf)); | |
214 | ||
215 | /* Remove the last space to make things prettier. */ | |
216 | rv = (int)strlen(buf); | |
217 | if (rv > 0) | |
218 | buf[rv - 1] = 0; | |
219 | ||
220 | zlog_debug( | |
221 | " [lid=%u rid=%u flags=0x%02x{%s} state=%s " | |
222 | "diagnostics=%s mult=%d tx=%u rx=%u erx=%u]", | |
223 | ntohl(msg->data.state.lid), ntohl(msg->data.state.rid), | |
224 | flags, buf, state_list[msg->data.state.state].str, | |
225 | diag2str(msg->data.state.diagnostics), | |
226 | msg->data.state.detection_multiplier, | |
227 | ntohl(msg->data.state.desired_tx), | |
228 | ntohl(msg->data.state.required_rx), | |
229 | ntohl(msg->data.state.required_echo_rx)); | |
230 | break; | |
231 | ||
232 | case DP_REQUEST_SESSION_COUNTERS: | |
233 | zlog_debug(" [lid=%u]", ntohl(msg->data.counters_req.lid)); | |
234 | break; | |
235 | ||
236 | case BFD_SESSION_COUNTERS: | |
237 | zlog_debug( | |
238 | " [lid=%u " | |
239 | "control{in %" PRIu64 " bytes (%" PRIu64 | |
240 | " packets), " | |
241 | "out %" PRIu64 " bytes (%" PRIu64 | |
242 | " packets)} " | |
243 | "echo{in %" PRIu64 " bytes (%" PRIu64 | |
244 | " packets), " | |
245 | "out %" PRIu64 " bytes (%" PRIu64 " packets)}]", | |
246 | ntohl(msg->data.session_counters.lid), | |
247 | (uint64_t)be64toh( | |
248 | msg->data.session_counters.control_input_bytes), | |
249 | (uint64_t)be64toh(msg->data.session_counters | |
250 | .control_input_packets), | |
251 | (uint64_t)be64toh(msg->data.session_counters | |
252 | .control_output_bytes), | |
253 | (uint64_t)be64toh(msg->data.session_counters | |
254 | .control_output_packets), | |
255 | (uint64_t)be64toh(msg->data.session_counters.echo_input_bytes), | |
256 | (uint64_t)be64toh( | |
257 | msg->data.session_counters.echo_input_packets), | |
258 | (uint64_t)be64toh( | |
259 | msg->data.session_counters.echo_output_bytes), | |
260 | (uint64_t)be64toh(msg->data.session_counters | |
261 | .echo_output_packets)); | |
262 | break; | |
263 | } | |
264 | } | |
265 | ||
400632a9 RZ |
266 | /** |
267 | * Gets the next unused non zero identification. | |
268 | * | |
269 | * \param bdc the data plane context. | |
270 | * | |
271 | * \returns next usable id. | |
272 | */ | |
273 | static uint16_t bfd_dplane_next_id(struct bfd_dplane_ctx *bdc) | |
274 | { | |
275 | bdc->last_id++; | |
276 | ||
277 | /* Don't use reserved id `0`. */ | |
278 | if (bdc->last_id == 0) | |
279 | bdc->last_id = 1; | |
280 | ||
281 | return bdc->last_id; | |
282 | } | |
283 | ||
230aefe2 RZ |
284 | static ssize_t bfd_dplane_flush(struct bfd_dplane_ctx *bdc) |
285 | { | |
286 | ssize_t total = 0; | |
287 | int rv; | |
288 | ||
289 | while (STREAM_READABLE(bdc->outbuf)) { | |
290 | /* Flush buffer contents to socket. */ | |
291 | rv = stream_flush(bdc->outbuf, bdc->sock); | |
292 | if (rv == -1) { | |
293 | /* Interruption: try again. */ | |
294 | if (errno == EAGAIN || errno == EWOULDBLOCK | |
295 | || errno == EINTR) | |
296 | continue; | |
297 | ||
298 | zlog_warn("%s: socket failed: %s", __func__, | |
299 | strerror(errno)); | |
300 | bfd_dplane_ctx_free(bdc); | |
301 | return 0; | |
302 | } | |
303 | if (rv == 0) { | |
304 | if (bglobal.debug_dplane) | |
305 | zlog_info("%s: connection closed", __func__); | |
306 | ||
307 | bfd_dplane_ctx_free(bdc); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | /* Account total written. */ | |
312 | total += rv; | |
313 | ||
314 | /* Account output bytes. */ | |
315 | bdc->out_bytes += (uint64_t)rv; | |
316 | ||
317 | /* Forward pointer. */ | |
318 | stream_forward_getp(bdc->outbuf, (size_t)rv); | |
319 | } | |
320 | ||
321 | /* Make more space for new data. */ | |
322 | stream_pulldown(bdc->outbuf); | |
323 | ||
324 | /* Disable write ready events. */ | |
325 | THREAD_OFF(bdc->outbufev); | |
326 | ||
327 | return total; | |
328 | } | |
329 | ||
330 | static int bfd_dplane_write(struct thread *t) | |
331 | { | |
6655b43d RZ |
332 | struct bfd_dplane_ctx *bdc = THREAD_ARG(t); |
333 | ||
334 | /* Handle connection stage. */ | |
335 | if (bdc->connecting && bfd_dplane_client_connecting(bdc)) | |
336 | return 0; | |
337 | ||
338 | bfd_dplane_flush(bdc); | |
339 | ||
230aefe2 RZ |
340 | return 0; |
341 | } | |
342 | ||
343 | static void | |
344 | bfd_dplane_session_state_change(struct bfd_dplane_ctx *bdc, | |
345 | const struct bfddp_state_change *state) | |
346 | { | |
347 | struct bfd_session *bs; | |
348 | uint32_t flags; | |
349 | int old_state; | |
350 | ||
351 | /* Look up session. */ | |
352 | bs = bfd_id_lookup(ntohl(state->lid)); | |
353 | if (bs == NULL) { | |
354 | if (bglobal.debug_dplane) | |
355 | zlog_debug("%s: failed to find session to update", | |
356 | __func__); | |
357 | return; | |
358 | } | |
359 | ||
360 | flags = ntohl(state->remote_flags); | |
361 | old_state = bs->ses_state; | |
362 | ||
363 | /* Update session state. */ | |
364 | bs->ses_state = state->state; | |
365 | bs->remote_diag = state->diagnostics; | |
366 | bs->discrs.remote_discr = ntohl(state->rid); | |
367 | bs->remote_cbit = !!(flags & RBIT_CPI); | |
368 | bs->remote_detect_mult = state->detection_multiplier; | |
369 | bs->remote_timers.desired_min_tx = ntohl(state->desired_tx); | |
370 | bs->remote_timers.required_min_rx = ntohl(state->required_rx); | |
371 | bs->remote_timers.required_min_echo = ntohl(state->required_echo_rx); | |
372 | ||
373 | /* Notify and update counters. */ | |
374 | control_notify(bs, bs->ses_state); | |
375 | ||
376 | /* No state change. */ | |
377 | if (old_state == bs->ses_state) | |
378 | return; | |
379 | ||
380 | switch (bs->ses_state) { | |
381 | case PTM_BFD_ADM_DOWN: | |
382 | case PTM_BFD_DOWN: | |
383 | /* Both states mean down. */ | |
384 | if (old_state == PTM_BFD_ADM_DOWN || old_state == PTM_BFD_DOWN) | |
385 | break; | |
386 | ||
387 | monotime(&bs->downtime); | |
388 | bs->stats.session_down++; | |
389 | break; | |
390 | case PTM_BFD_UP: | |
391 | monotime(&bs->uptime); | |
392 | bs->stats.session_up++; | |
393 | break; | |
394 | case PTM_BFD_INIT: | |
395 | /* NOTHING */ | |
396 | break; | |
397 | ||
398 | default: | |
399 | zlog_warn("%s: unhandled new state %d", __func__, | |
400 | bs->ses_state); | |
401 | break; | |
402 | } | |
403 | ||
404 | if (bglobal.debug_peer_event) | |
405 | zlog_debug("state-change: [data plane: %s] %s -> %s", | |
406 | bs_to_string(bs), state_list[old_state].str, | |
407 | state_list[bs->ses_state].str); | |
408 | } | |
409 | ||
410 | /** | |
411 | * Enqueue message in output buffer. | |
412 | * | |
413 | * \param[in,out] bdc data plane client context. | |
414 | * \param[in] buf the message to buffer. | |
415 | * \param[in] buflen the amount of bytes to buffer. | |
416 | * | |
417 | * \returns `-1` on failure (buffer full) or `0` on success. | |
418 | */ | |
419 | static int bfd_dplane_enqueue(struct bfd_dplane_ctx *bdc, const void *buf, | |
420 | size_t buflen) | |
421 | { | |
422 | size_t rlen; | |
423 | ||
6655b43d RZ |
424 | /* Handle not connected yet client. */ |
425 | if (bdc->client && bdc->sock == -1) | |
426 | return -1; | |
427 | ||
230aefe2 RZ |
428 | /* Not enough space. */ |
429 | if (buflen > STREAM_WRITEABLE(bdc->outbuf)) { | |
430 | bdc->out_fullev++; | |
431 | return -1; | |
432 | } | |
433 | ||
434 | /* Show debug message if active. */ | |
435 | bfd_dplane_debug_message((struct bfddp_message *)buf); | |
436 | ||
437 | /* Buffer the message. */ | |
438 | stream_write(bdc->outbuf, buf, buflen); | |
439 | ||
440 | /* Account message as sent. */ | |
441 | bdc->out_msgs++; | |
442 | /* Register peak buffered bytes. */ | |
443 | rlen = STREAM_READABLE(bdc->outbuf); | |
444 | if (bdc->out_bytes_peak < rlen) | |
445 | bdc->out_bytes_peak = rlen; | |
446 | ||
447 | /* Schedule if it is not yet. */ | |
448 | if (bdc->outbufev == NULL) | |
449 | thread_add_write(master, bfd_dplane_write, bdc, bdc->sock, | |
450 | &bdc->outbufev); | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static void bfd_dplane_echo_request_handle(struct bfd_dplane_ctx *bdc, | |
456 | const struct bfddp_message *bm) | |
457 | { | |
458 | struct bfddp_message msg = {}; | |
459 | uint16_t msglen = sizeof(msg.header) + sizeof(msg.data.echo); | |
460 | struct timeval tv; | |
461 | ||
462 | gettimeofday(&tv, NULL); | |
463 | ||
464 | /* Prepare header. */ | |
465 | msg.header.version = BFD_DP_VERSION; | |
466 | msg.header.type = htons(ECHO_REPLY); | |
467 | msg.header.length = htons(msglen); | |
468 | ||
469 | /* Prepare payload. */ | |
470 | msg.data.echo.dp_time = bm->data.echo.dp_time; | |
471 | msg.data.echo.bfdd_time = | |
472 | htobe64((uint64_t)((tv.tv_sec * 1000000) + tv.tv_usec)); | |
473 | ||
474 | /* Enqueue for output. */ | |
475 | bfd_dplane_enqueue(bdc, &msg, msglen); | |
476 | } | |
477 | ||
478 | static void bfd_dplane_handle_message(struct bfddp_message *msg, void *arg) | |
479 | { | |
480 | enum bfddp_message_type bmt; | |
481 | struct bfd_dplane_ctx *bdc = arg; | |
482 | ||
483 | /* Call the appropriated handler. */ | |
484 | bmt = ntohs(msg->header.type); | |
485 | switch (bmt) { | |
486 | case ECHO_REQUEST: | |
487 | bfd_dplane_echo_request_handle(bdc, msg); | |
488 | break; | |
489 | case BFD_STATE_CHANGE: | |
490 | bfd_dplane_session_state_change(bdc, &msg->data.state); | |
491 | break; | |
492 | case ECHO_REPLY: | |
493 | /* NOTHING: we don't do anything with this information. */ | |
494 | break; | |
495 | case DP_ADD_SESSION: | |
496 | case DP_DELETE_SESSION: | |
497 | case DP_REQUEST_SESSION_COUNTERS: | |
498 | /* NOTHING: we are not supposed to receive this. */ | |
499 | break; | |
500 | case BFD_SESSION_COUNTERS: | |
501 | /* | |
502 | * NOTHING: caller of DP_REQUEST_SESSION_COUNTERS should | |
503 | * handle this with `bfd_dplane_expect`. | |
504 | */ | |
505 | break; | |
506 | ||
507 | default: | |
508 | zlog_debug("%s: unhandled message type %d", __func__, bmt); | |
509 | break; | |
510 | } | |
511 | } | |
512 | ||
513 | /** | |
514 | * Reads the socket immediately to receive data plane answer to query. | |
515 | * | |
516 | * \param bdc the data plane context. | |
517 | * \param id the message ID waiting response. | |
518 | * \param cb the callback to call when ready. | |
519 | * \param arg the callback argument. | |
520 | * | |
521 | * \return | |
522 | * `-2` on unavailability (try again), `-1` on failure or `0` on success. | |
523 | */ | |
524 | static int bfd_dplane_expect(struct bfd_dplane_ctx *bdc, uint16_t id, | |
525 | bfd_dplane_expect_cb cb, void *arg) | |
526 | { | |
527 | struct bfddp_message_header *bh; | |
528 | size_t rlen = 0, reads = 0; | |
529 | ssize_t rv; | |
530 | ||
531 | /* | |
532 | * Don't attempt to read if buffer is full, otherwise we'll get a | |
533 | * bogus 'connection closed' signal (rv == 0). | |
534 | */ | |
535 | if (bdc->inbuf->endp == bdc->inbuf->size) | |
536 | goto skip_read; | |
537 | ||
538 | read_again: | |
539 | /* Attempt to read message from client. */ | |
540 | rv = stream_read_try(bdc->inbuf, bdc->sock, | |
541 | STREAM_WRITEABLE(bdc->inbuf)); | |
542 | if (rv == 0) { | |
543 | if (bglobal.debug_dplane) | |
544 | zlog_info("%s: socket closed", __func__); | |
545 | ||
546 | bfd_dplane_ctx_free(bdc); | |
547 | return -1; | |
548 | } | |
549 | if (rv == -1) { | |
550 | zlog_warn("%s: socket failed: %s", __func__, strerror(errno)); | |
551 | bfd_dplane_ctx_free(bdc); | |
552 | return -1; | |
553 | } | |
554 | ||
555 | /* We got interrupted, reschedule read. */ | |
556 | if (rv == -2) | |
557 | return -2; | |
558 | ||
559 | /* Account read bytes. */ | |
560 | bdc->in_bytes += (uint64_t)rv; | |
561 | /* Register peak buffered bytes. */ | |
562 | rlen = STREAM_READABLE(bdc->inbuf); | |
563 | if (bdc->in_bytes_peak < rlen) | |
564 | bdc->in_bytes_peak = rlen; | |
565 | ||
566 | skip_read: | |
567 | while (rlen > 0) { | |
568 | bh = (struct bfddp_message_header *)stream_pnt(bdc->inbuf); | |
569 | /* Not enough data read. */ | |
570 | if (ntohs(bh->length) > rlen) | |
571 | goto read_again; | |
572 | ||
573 | /* Account full message read. */ | |
574 | bdc->in_msgs++; | |
575 | ||
576 | /* Account this message as whole read for buffer reorganize. */ | |
577 | reads++; | |
578 | ||
579 | /* Check for bad version. */ | |
580 | if (bh->version != BFD_DP_VERSION) { | |
581 | zlog_err("%s: bad data plane client version: %d", | |
582 | __func__, bh->version); | |
583 | return -1; | |
584 | } | |
585 | ||
586 | /* Show debug message if active. */ | |
587 | bfd_dplane_debug_message((struct bfddp_message *)bh); | |
588 | ||
589 | /* | |
590 | * Handle incoming message with callback if the ID matches, | |
591 | * otherwise fallback to default handler. | |
592 | */ | |
593 | if (id && ntohs(bh->id) == id) | |
594 | cb((struct bfddp_message *)bh, arg); | |
595 | else | |
596 | bfd_dplane_handle_message((struct bfddp_message *)bh, | |
597 | bdc); | |
598 | ||
599 | /* Advance current read pointer. */ | |
600 | stream_forward_getp(bdc->inbuf, ntohs(bh->length)); | |
601 | ||
602 | /* Reduce the buffer available bytes. */ | |
603 | rlen -= ntohs(bh->length); | |
604 | ||
605 | /* Reorganize buffer to handle more bytes read. */ | |
606 | if (reads >= 3) { | |
607 | stream_pulldown(bdc->inbuf); | |
608 | reads = 0; | |
609 | } | |
610 | ||
611 | /* We found the message, return to caller. */ | |
612 | if (id && ntohs(bh->id) == id) | |
613 | break; | |
614 | } | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
619 | static int bfd_dplane_read(struct thread *t) | |
620 | { | |
621 | struct bfd_dplane_ctx *bdc = THREAD_ARG(t); | |
622 | int rv; | |
623 | ||
624 | rv = bfd_dplane_expect(bdc, 0, bfd_dplane_handle_message, NULL); | |
625 | if (rv == -1) | |
626 | return 0; | |
627 | ||
628 | stream_pulldown(bdc->inbuf); | |
629 | thread_add_read(master, bfd_dplane_read, bdc, bdc->sock, &bdc->inbufev); | |
630 | return 0; | |
631 | } | |
632 | ||
efd04d60 RZ |
633 | static void _bfd_session_register_dplane(struct hash_bucket *hb, void *arg) |
634 | { | |
635 | struct bfd_session *bs = hb->data; | |
636 | struct bfd_dplane_ctx *bdc = arg; | |
637 | ||
638 | if (bs->bdc != NULL) | |
639 | return; | |
640 | ||
641 | /* Disable software session. */ | |
642 | bfd_session_disable(bs); | |
643 | ||
644 | /* Move session to data plane. */ | |
645 | _bfd_dplane_add_session(bdc, bs); | |
646 | } | |
647 | ||
230aefe2 RZ |
648 | static struct bfd_dplane_ctx *bfd_dplane_ctx_new(int sock) |
649 | { | |
650 | struct bfd_dplane_ctx *bdc; | |
651 | ||
652 | bdc = XCALLOC(MTYPE_BFDD_DPLANE_CTX, sizeof(*bdc)); | |
653 | if (bdc == NULL) | |
654 | return NULL; | |
655 | ||
656 | bdc->sock = sock; | |
657 | bdc->inbuf = stream_new(BFD_DPLANE_CLIENT_BUF_SIZE); | |
658 | bdc->outbuf = stream_new(BFD_DPLANE_CLIENT_BUF_SIZE); | |
6655b43d RZ |
659 | |
660 | /* If not socket ready, skip read and session registration. */ | |
661 | if (sock == -1) | |
662 | return bdc; | |
663 | ||
230aefe2 RZ |
664 | thread_add_read(master, bfd_dplane_read, bdc, sock, &bdc->inbufev); |
665 | ||
efd04d60 RZ |
666 | /* Register all unattached sessions. */ |
667 | bfd_key_iterate(_bfd_session_register_dplane, bdc); | |
668 | ||
230aefe2 RZ |
669 | return bdc; |
670 | } | |
671 | ||
672 | static void _bfd_session_unregister_dplane(struct hash_bucket *hb, void *arg) | |
673 | { | |
674 | struct bfd_session *bs = hb->data; | |
675 | struct bfd_dplane_ctx *bdc = arg; | |
676 | ||
677 | if (bs->bdc != bdc) | |
678 | return; | |
679 | ||
680 | bs->bdc = NULL; | |
efd04d60 RZ |
681 | |
682 | /* Fallback to software. */ | |
683 | bfd_session_enable(bs); | |
230aefe2 RZ |
684 | } |
685 | ||
686 | static void bfd_dplane_ctx_free(struct bfd_dplane_ctx *bdc) | |
687 | { | |
688 | if (bglobal.debug_dplane) | |
689 | zlog_debug("%s: terminating data plane client %d", __func__, | |
690 | bdc->sock); | |
691 | ||
6655b43d RZ |
692 | /* Client mode has special treatment. */ |
693 | if (bdc->client) { | |
694 | /* Disable connection event if any. */ | |
695 | THREAD_OFF(bdc->connectev); | |
696 | ||
697 | /* Normal treatment on shutdown. */ | |
698 | if (bglobal.bg_shutdown) | |
699 | goto free_resources; | |
700 | ||
701 | /* Attempt reconnection. */ | |
702 | socket_close(&bdc->sock); | |
703 | THREAD_OFF(bdc->inbufev); | |
704 | THREAD_OFF(bdc->outbufev); | |
705 | thread_add_timer(master, bfd_dplane_client_connect, bdc, 3, | |
706 | &bdc->connectev); | |
707 | return; | |
708 | } | |
709 | ||
710 | free_resources: | |
230aefe2 RZ |
711 | /* Remove from the list of attached data planes. */ |
712 | TAILQ_REMOVE(&bglobal.bg_dplaneq, bdc, entry); | |
713 | ||
714 | /* Detach all associated sessions. */ | |
715 | if (bglobal.bg_shutdown == false) | |
716 | bfd_key_iterate(_bfd_session_unregister_dplane, bdc); | |
717 | ||
718 | /* Free resources. */ | |
719 | socket_close(&bdc->sock); | |
720 | stream_free(bdc->inbuf); | |
721 | stream_free(bdc->outbuf); | |
722 | THREAD_OFF(bdc->inbufev); | |
723 | THREAD_OFF(bdc->outbufev); | |
724 | XFREE(MTYPE_BFDD_DPLANE_CTX, bdc); | |
725 | } | |
726 | ||
efd04d60 RZ |
727 | static void _bfd_dplane_session_fill(const struct bfd_session *bs, |
728 | struct bfddp_message *msg) | |
729 | { | |
730 | uint16_t msglen = sizeof(msg->header) + sizeof(msg->data.session); | |
731 | ||
732 | /* Message header. */ | |
733 | msg->header.version = BFD_DP_VERSION; | |
734 | msg->header.length = ntohs(msglen); | |
735 | msg->header.type = ntohs(DP_ADD_SESSION); | |
736 | ||
737 | /* Message payload. */ | |
738 | msg->data.session.dst = bs->key.peer; | |
739 | msg->data.session.src = bs->key.local; | |
740 | msg->data.session.detect_mult = bs->detect_mult; | |
741 | ||
742 | if (bs->ifp) { | |
743 | msg->data.session.ifindex = htonl(bs->ifp->ifindex); | |
744 | strlcpy(msg->data.session.ifname, bs->ifp->name, | |
745 | sizeof(msg->data.session.ifname)); | |
746 | } | |
747 | if (bs->flags & BFD_SESS_FLAG_MH) { | |
748 | msg->data.session.flags |= SESSION_MULTIHOP; | |
749 | msg->data.session.ttl = bs->mh_ttl; | |
750 | } else | |
751 | msg->data.session.ttl = BFD_TTL_VAL; | |
752 | ||
753 | if (bs->flags & BFD_SESS_FLAG_IPV6) | |
754 | msg->data.session.flags |= SESSION_IPV6; | |
755 | if (bs->flags & BFD_SESS_FLAG_ECHO) | |
756 | msg->data.session.flags |= SESSION_ECHO; | |
757 | if (bs->flags & BFD_SESS_FLAG_CBIT) | |
758 | msg->data.session.flags |= SESSION_CBIT; | |
759 | if (bs->flags & BFD_SESS_FLAG_PASSIVE) | |
760 | msg->data.session.flags |= SESSION_PASSIVE; | |
761 | if (bs->flags & BFD_SESS_FLAG_SHUTDOWN) | |
762 | msg->data.session.flags |= SESSION_SHUTDOWN; | |
763 | ||
764 | msg->data.session.flags = htonl(msg->data.session.flags); | |
765 | msg->data.session.lid = htonl(bs->discrs.my_discr); | |
766 | msg->data.session.min_tx = htonl(bs->timers.desired_min_tx); | |
767 | msg->data.session.min_rx = htonl(bs->timers.required_min_rx); | |
768 | msg->data.session.min_echo_rx = htonl(bs->timers.required_min_echo); | |
769 | } | |
770 | ||
771 | static int _bfd_dplane_add_session(struct bfd_dplane_ctx *bdc, | |
772 | struct bfd_session *bs) | |
773 | { | |
774 | int rv; | |
775 | ||
776 | /* Associate session. */ | |
777 | bs->bdc = bdc; | |
778 | ||
779 | /* Reset previous state. */ | |
780 | bs->remote_diag = 0; | |
781 | bs->local_diag = 0; | |
782 | bs->ses_state = PTM_BFD_DOWN; | |
783 | ||
784 | /* Enqueue message to data plane client. */ | |
785 | rv = bfd_dplane_update_session(bs); | |
786 | if (rv != 0) | |
787 | bs->bdc = NULL; | |
788 | ||
789 | return rv; | |
790 | } | |
791 | ||
400632a9 RZ |
792 | static void _bfd_dplane_update_session_counters(struct bfddp_message *msg, |
793 | void *arg) | |
794 | { | |
795 | struct bfd_session *bs = arg; | |
796 | ||
797 | bs->stats.rx_ctrl_pkt = | |
798 | be64toh(msg->data.session_counters.control_input_packets); | |
799 | bs->stats.tx_ctrl_pkt = | |
800 | be64toh(msg->data.session_counters.control_output_packets); | |
801 | bs->stats.rx_echo_pkt = | |
802 | be64toh(msg->data.session_counters.echo_input_packets); | |
803 | bs->stats.tx_echo_pkt = | |
804 | be64toh(msg->data.session_counters.echo_output_bytes); | |
805 | } | |
806 | ||
807 | /** | |
808 | * Send message to data plane requesting the session counters. | |
809 | * | |
810 | * \param bs the BFD session. | |
811 | * | |
812 | * \returns `0` on failure or the request id. | |
813 | */ | |
814 | static uint16_t bfd_dplane_request_counters(const struct bfd_session *bs) | |
815 | { | |
816 | struct bfddp_message msg = {}; | |
817 | size_t msglen = sizeof(msg.header) + sizeof(msg.data.counters_req); | |
818 | ||
819 | /* Fill header information. */ | |
820 | msg.header.version = BFD_DP_VERSION; | |
821 | msg.header.length = htons(msglen); | |
822 | msg.header.type = htons(DP_REQUEST_SESSION_COUNTERS); | |
823 | msg.header.id = htons(bfd_dplane_next_id(bs->bdc)); | |
824 | ||
825 | /* Session to get counters. */ | |
826 | msg.data.counters_req.lid = htonl(bs->discrs.my_discr); | |
827 | ||
828 | /* If enqueue failed, let caller know. */ | |
829 | if (bfd_dplane_enqueue(bs->bdc, &msg, msglen) == -1) | |
830 | return 0; | |
831 | ||
832 | /* Flush socket. */ | |
833 | bfd_dplane_flush(bs->bdc); | |
834 | ||
835 | return ntohs(msg.header.id); | |
836 | } | |
837 | ||
230aefe2 RZ |
838 | /* |
839 | * Data plane listening socket. | |
840 | */ | |
841 | static int bfd_dplane_accept(struct thread *t) | |
842 | { | |
843 | struct bfd_global *bg = THREAD_ARG(t); | |
844 | struct bfd_dplane_ctx *bdc; | |
845 | int sock; | |
846 | ||
847 | /* Accept new connection. */ | |
848 | sock = accept(bg->bg_dplane_sock, NULL, 0); | |
849 | if (sock == -1) { | |
850 | zlog_warn("%s: accept failed: %s", __func__, strerror(errno)); | |
851 | goto reschedule_and_return; | |
852 | } | |
853 | ||
854 | /* Create and handle new connection. */ | |
855 | bdc = bfd_dplane_ctx_new(sock); | |
856 | TAILQ_INSERT_TAIL(&bglobal.bg_dplaneq, bdc, entry); | |
857 | ||
858 | if (bglobal.debug_dplane) | |
859 | zlog_debug("%s: new data plane client connected", __func__); | |
860 | ||
861 | reschedule_and_return: | |
862 | thread_add_read(master, bfd_dplane_accept, bg, bg->bg_dplane_sock, | |
863 | &bglobal.bg_dplane_sockev); | |
864 | return 0; | |
865 | } | |
866 | ||
6655b43d RZ |
867 | /* |
868 | * Data plane connecting socket. | |
869 | */ | |
870 | static void _bfd_dplane_client_bootstrap(struct bfd_dplane_ctx *bdc) | |
871 | { | |
872 | bdc->connecting = false; | |
873 | ||
874 | /* Clean up buffers. */ | |
875 | stream_reset(bdc->inbuf); | |
876 | stream_reset(bdc->outbuf); | |
877 | ||
878 | /* Ask for read notifications. */ | |
879 | thread_add_read(master, bfd_dplane_read, bdc, bdc->sock, &bdc->inbufev); | |
880 | ||
881 | /* Remove all sessions then register again to send them all. */ | |
882 | bfd_key_iterate(_bfd_session_unregister_dplane, bdc); | |
883 | bfd_key_iterate(_bfd_session_register_dplane, bdc); | |
884 | } | |
885 | ||
886 | static bool bfd_dplane_client_connecting(struct bfd_dplane_ctx *bdc) | |
887 | { | |
888 | int rv; | |
889 | socklen_t rvlen = sizeof(rv); | |
890 | ||
891 | /* Make sure `errno` is reset, then test `getsockopt` success. */ | |
892 | errno = 0; | |
893 | if (getsockopt(bdc->sock, SOL_SOCKET, SO_ERROR, &rv, &rvlen) == -1) | |
894 | rv = -1; | |
895 | ||
896 | /* Connection successful. */ | |
897 | if (rv == 0) { | |
898 | if (bglobal.debug_dplane) | |
899 | zlog_debug("%s: connected to server: %d", __func__, | |
900 | bdc->sock); | |
901 | ||
902 | _bfd_dplane_client_bootstrap(bdc); | |
903 | return false; | |
904 | } | |
905 | ||
906 | switch (rv) { | |
907 | case EINTR: | |
908 | case EAGAIN: | |
909 | case EALREADY: | |
910 | case EINPROGRESS: | |
911 | /* non error, wait more. */ | |
912 | return true; | |
913 | ||
914 | default: | |
915 | zlog_warn("%s: connection failed: %s", __func__, | |
916 | strerror(errno)); | |
917 | bfd_dplane_ctx_free(bdc); | |
918 | return true; | |
919 | } | |
920 | } | |
921 | ||
922 | static int bfd_dplane_client_connect(struct thread *t) | |
923 | { | |
924 | struct bfd_dplane_ctx *bdc = THREAD_ARG(t); | |
925 | int rv, sock; | |
926 | socklen_t rvlen = sizeof(rv); | |
927 | ||
928 | /* Allocate new socket. */ | |
929 | sock = socket(bdc->addr.sa.sa_family, SOCK_STREAM, 0); | |
930 | if (sock == -1) { | |
931 | zlog_warn("%s: failed to initialize socket: %s", __func__, | |
932 | strerror(errno)); | |
933 | goto reschedule_connect; | |
934 | } | |
935 | ||
936 | /* Set non blocking socket. */ | |
937 | set_nonblocking(sock); | |
938 | ||
939 | /* Set 'no delay' (disables nagle algorithm) for IPv4/IPv6. */ | |
940 | rv = 1; | |
941 | if (bdc->addr.sa.sa_family != AF_UNIX | |
942 | && setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &rv, rvlen) == -1) | |
943 | zlog_warn("%s: TCP_NODELAY: %s", __func__, strerror(errno)); | |
944 | ||
945 | /* Attempt to connect. */ | |
946 | rv = connect(sock, &bdc->addr.sa, bdc->addrlen); | |
947 | if (rv == -1 && (errno != EINPROGRESS && errno != EAGAIN)) { | |
948 | zlog_warn("%s: data plane connection failed: %s", __func__, | |
949 | strerror(errno)); | |
950 | goto reschedule_connect; | |
951 | } | |
952 | ||
953 | bdc->sock = sock; | |
954 | if (rv == -1) { | |
955 | if (bglobal.debug_dplane) | |
956 | zlog_debug("%s: server connection in progress: %d", | |
957 | __func__, sock); | |
958 | ||
959 | /* If we are not connected yet, ask for write notifications. */ | |
960 | bdc->connecting = true; | |
961 | thread_add_write(master, bfd_dplane_write, bdc, bdc->sock, | |
962 | &bdc->outbufev); | |
963 | } else { | |
964 | if (bglobal.debug_dplane) | |
965 | zlog_debug("%s: server connection: %d", __func__, sock); | |
966 | ||
967 | /* Otherwise just start accepting data. */ | |
968 | _bfd_dplane_client_bootstrap(bdc); | |
969 | } | |
970 | ||
971 | return 0; | |
972 | ||
973 | reschedule_connect: | |
974 | THREAD_OFF(bdc->inbufev); | |
975 | THREAD_OFF(bdc->outbufev); | |
976 | socket_close(&sock); | |
977 | thread_add_timer(master, bfd_dplane_client_connect, bdc, 3, | |
978 | &bdc->connectev); | |
979 | return 0; | |
980 | } | |
981 | ||
982 | static void bfd_dplane_client_init(const struct sockaddr *sa, socklen_t salen) | |
983 | { | |
984 | struct bfd_dplane_ctx *bdc; | |
985 | ||
986 | /* Allocate context and copy address for reconnection. */ | |
987 | bdc = bfd_dplane_ctx_new(-1); | |
988 | if (salen <= sizeof(bdc->addr)) { | |
989 | memcpy(&bdc->addr, sa, salen); | |
990 | bdc->addrlen = sizeof(bdc->addr); | |
991 | } else { | |
992 | memcpy(&bdc->addr, sa, sizeof(bdc->addr)); | |
993 | bdc->addrlen = sizeof(bdc->addr); | |
994 | zlog_warn("%s: server address truncated (from %d to %d)", | |
995 | __func__, salen, bdc->addrlen); | |
996 | } | |
997 | ||
998 | bdc->client = true; | |
999 | ||
1000 | thread_add_timer(master, bfd_dplane_client_connect, bdc, 0, | |
1001 | &bdc->connectev); | |
1002 | ||
1003 | /* Insert into data plane lists. */ | |
1004 | TAILQ_INSERT_TAIL(&bglobal.bg_dplaneq, bdc, entry); | |
1005 | } | |
1006 | ||
230aefe2 RZ |
1007 | /** |
1008 | * Termination phase of the distributed BFD infrastructure: free all allocated | |
1009 | * resources. | |
1010 | */ | |
1011 | static int bfd_dplane_finish_late(void) | |
1012 | { | |
1013 | struct bfd_dplane_ctx *bdc; | |
1014 | ||
1015 | if (bglobal.debug_dplane) | |
1016 | zlog_debug("%s: terminating distributed BFD", __func__); | |
1017 | ||
1018 | /* Free all data plane client contexts. */ | |
1019 | while ((bdc = TAILQ_FIRST(&bglobal.bg_dplaneq)) != NULL) | |
1020 | bfd_dplane_ctx_free(bdc); | |
1021 | ||
1022 | /* Cancel accept thread and close socket. */ | |
1023 | THREAD_OFF(bglobal.bg_dplane_sockev); | |
1024 | close(bglobal.bg_dplane_sock); | |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Data plane exported functions. | |
1031 | */ | |
6655b43d | 1032 | void bfd_dplane_init(const struct sockaddr *sa, socklen_t salen, bool client) |
230aefe2 RZ |
1033 | { |
1034 | int sock; | |
1035 | ||
1036 | zlog_info("initializing distributed BFD"); | |
1037 | ||
6655b43d RZ |
1038 | /* Initialize queue header. */ |
1039 | TAILQ_INIT(&bglobal.bg_dplaneq); | |
1040 | ||
1041 | /* Initialize listening socket. */ | |
1042 | bglobal.bg_dplane_sock = -1; | |
1043 | ||
1044 | /* Observe shutdown events. */ | |
1045 | hook_register(frr_fini, bfd_dplane_finish_late); | |
1046 | ||
1047 | /* Handle client mode. */ | |
1048 | if (client) { | |
1049 | bfd_dplane_client_init(sa, salen); | |
1050 | return; | |
1051 | } | |
1052 | ||
230aefe2 RZ |
1053 | /* |
1054 | * Data plane socket creation: | |
1055 | * - Set REUSEADDR option for taking over previously open socket. | |
1056 | * - Bind to address requested (maybe IPv4, IPv6, UNIX etc...). | |
1057 | * - Listen on that address for new connections. | |
1058 | * - Ask to be waken up when a new connection comes. | |
1059 | */ | |
1060 | sock = socket(sa->sa_family, SOCK_STREAM, 0); | |
1061 | if (sock == -1) { | |
1062 | zlog_warn("%s: failed to initialize socket: %s", __func__, | |
1063 | strerror(errno)); | |
1064 | return; | |
1065 | } | |
1066 | ||
1067 | if (sockopt_reuseaddr(sock) == -1) { | |
1068 | zlog_warn("%s: failed to set reuseaddr: %s", __func__, | |
1069 | strerror(errno)); | |
1070 | close(sock); | |
1071 | return; | |
1072 | } | |
1073 | ||
1074 | /* Handle UNIX socket: delete previous socket if any. */ | |
1075 | if (sa->sa_family == AF_UNIX) | |
1076 | unlink(((struct sockaddr_un *)sa)->sun_path); | |
1077 | ||
1078 | if (bind(sock, sa, salen) == -1) { | |
1079 | zlog_warn("%s: failed to bind socket: %s", __func__, | |
1080 | strerror(errno)); | |
1081 | close(sock); | |
1082 | return; | |
1083 | } | |
1084 | ||
1085 | if (listen(sock, SOMAXCONN) == -1) { | |
1086 | zlog_warn("%s: failed to put socket on listen: %s", __func__, | |
1087 | strerror(errno)); | |
1088 | close(sock); | |
1089 | return; | |
1090 | } | |
1091 | ||
1092 | bglobal.bg_dplane_sock = sock; | |
1093 | thread_add_read(master, bfd_dplane_accept, &bglobal, sock, | |
1094 | &bglobal.bg_dplane_sockev); | |
230aefe2 | 1095 | } |
efd04d60 RZ |
1096 | |
1097 | int bfd_dplane_add_session(struct bfd_session *bs) | |
1098 | { | |
1099 | struct bfd_dplane_ctx *bdc; | |
1100 | ||
1101 | /* Select a data plane client to install session. */ | |
1102 | TAILQ_FOREACH (bdc, &bglobal.bg_dplaneq, entry) { | |
1103 | if (_bfd_dplane_add_session(bdc, bs) == 0) | |
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | return -1; | |
1108 | } | |
1109 | ||
1110 | int bfd_dplane_update_session(const struct bfd_session *bs) | |
1111 | { | |
1112 | struct bfddp_message msg = {}; | |
1113 | ||
1114 | if (bs->bdc == NULL) | |
1115 | return 0; | |
1116 | ||
1117 | _bfd_dplane_session_fill(bs, &msg); | |
1118 | ||
1119 | /* Enqueue message to data plane client. */ | |
1120 | return bfd_dplane_enqueue(bs->bdc, &msg, ntohs(msg.header.length)); | |
1121 | } | |
1122 | ||
1123 | int bfd_dplane_delete_session(struct bfd_session *bs) | |
1124 | { | |
1125 | struct bfddp_message msg = {}; | |
1126 | int rv; | |
1127 | ||
1128 | /* Not using data plane, just return success. */ | |
1129 | if (bs->bdc == NULL) | |
1130 | return 0; | |
1131 | ||
1132 | /* Fill most of the common fields. */ | |
1133 | _bfd_dplane_session_fill(bs, &msg); | |
1134 | ||
1135 | /* Change the message type. */ | |
1136 | msg.header.type = ntohs(DP_DELETE_SESSION); | |
1137 | ||
1138 | /* Enqueue message to data plane client. */ | |
1139 | rv = bfd_dplane_enqueue(bs->bdc, &msg, ntohs(msg.header.length)); | |
1140 | ||
1141 | /* Remove association. */ | |
1142 | bs->bdc = NULL; | |
1143 | ||
1144 | return rv; | |
1145 | } | |
400632a9 RZ |
1146 | |
1147 | /* | |
1148 | * Data plane CLI. | |
1149 | */ | |
1150 | void bfd_dplane_show_counters(struct vty *vty) | |
1151 | { | |
1152 | struct bfd_dplane_ctx *bdc; | |
1153 | ||
1154 | #define SHOW_COUNTER(label, counter, formatter) \ | |
1155 | vty_out(vty, "%28s: %" formatter "\n", (label), (counter)) | |
1156 | ||
1157 | vty_out(vty, "%28s\n%28s\n", "Data plane", "=========="); | |
1158 | TAILQ_FOREACH (bdc, &bglobal.bg_dplaneq, entry) { | |
1159 | SHOW_COUNTER("File descriptor", bdc->sock, "d"); | |
1160 | SHOW_COUNTER("Input bytes", bdc->in_bytes, PRIu64); | |
1161 | SHOW_COUNTER("Input bytes peak", bdc->in_bytes_peak, PRIu64); | |
1162 | SHOW_COUNTER("Input messages", bdc->in_msgs, PRIu64); | |
1163 | SHOW_COUNTER("Input current usage", STREAM_READABLE(bdc->inbuf), | |
1164 | "zu"); | |
1165 | SHOW_COUNTER("Output bytes", bdc->out_bytes, PRIu64); | |
1166 | SHOW_COUNTER("Output bytes peak", bdc->out_bytes_peak, PRIu64); | |
1167 | SHOW_COUNTER("Output messages", bdc->out_msgs, PRIu64); | |
1168 | SHOW_COUNTER("Output full events", bdc->out_fullev, PRIu64); | |
1169 | SHOW_COUNTER("Output current usage", | |
1170 | STREAM_READABLE(bdc->inbuf), "zu"); | |
1171 | vty_out(vty, "\n"); | |
1172 | } | |
1173 | #undef SHOW_COUNTER | |
1174 | } | |
1175 | ||
1176 | int bfd_dplane_update_session_counters(struct bfd_session *bs) | |
1177 | { | |
1178 | uint16_t id; | |
1179 | int rv; | |
1180 | ||
1181 | /* If session is not using data plane, then just return success. */ | |
1182 | if (bs->bdc == NULL) | |
1183 | return 0; | |
1184 | ||
1185 | /* Make the request. */ | |
1186 | id = bfd_dplane_request_counters(bs); | |
1187 | if (id == 0) { | |
1188 | zlog_debug("%s: counters request failed", __func__); | |
1189 | return -1; | |
1190 | } | |
1191 | ||
1192 | /* Handle interruptions. */ | |
1193 | do { | |
1194 | rv = bfd_dplane_expect(bs->bdc, id, | |
1195 | _bfd_dplane_update_session_counters, bs); | |
1196 | } while (rv == -2); | |
1197 | ||
1198 | return rv; | |
1199 | } |