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e9e2c950 RZ |
1 | /********************************************************************* |
2 | * Copyright 2013 Cumulus Networks, LLC. All rights reserved. | |
3 | * Copyright 2014,2015,2016,2017 Cumulus Networks, Inc. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; either version 2 of the License, or (at your option) | |
8 | * any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * 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 | * bfd.c: implements the BFD protocol. | |
20 | * | |
21 | * Authors | |
22 | * ------- | |
23 | * Shrijeet Mukherjee [shm@cumulusnetworks.com] | |
24 | * Kanna Rajagopal [kanna@cumulusnetworks.com] | |
25 | * Radhika Mahankali [Radhika@cumulusnetworks.com] | |
26 | */ | |
27 | ||
28 | #include <zebra.h> | |
29 | ||
e9e2c950 RZ |
30 | #include "lib/jhash.h" |
31 | ||
32 | #include "bfd.h" | |
33 | ||
34 | DEFINE_QOBJ_TYPE(bfd_session); | |
35 | ||
36 | /* | |
37 | * Prototypes | |
38 | */ | |
9f37770f | 39 | static struct bfd_session *bs_peer_waiting_find(struct bfd_peer_cfg *bpc); |
d245e522 | 40 | |
e9e2c950 RZ |
41 | static uint32_t ptm_bfd_gen_ID(void); |
42 | static void ptm_bfd_echo_xmt_TO(struct bfd_session *bfd); | |
43 | static void bfd_session_free(struct bfd_session *bs); | |
d245e522 | 44 | static struct bfd_session *bfd_session_new(void); |
e9e2c950 RZ |
45 | static struct bfd_session *bfd_find_disc(struct sockaddr_any *sa, |
46 | uint32_t ldisc); | |
47 | static int bfd_session_update(struct bfd_session *bs, struct bfd_peer_cfg *bpc); | |
48 | static const char *get_diag_str(int diag); | |
49 | ||
9f37770f RZ |
50 | static void bs_admin_down_handler(struct bfd_session *bs, int nstate); |
51 | static void bs_down_handler(struct bfd_session *bs, int nstate); | |
52 | static void bs_init_handler(struct bfd_session *bs, int nstate); | |
53 | static void bs_up_handler(struct bfd_session *bs, int nstate); | |
54 | ||
e9e2c950 RZ |
55 | |
56 | /* | |
57 | * Functions | |
58 | */ | |
9f37770f | 59 | static struct bfd_session *bs_peer_waiting_find(struct bfd_peer_cfg *bpc) |
d245e522 RZ |
60 | { |
61 | struct bfd_session_observer *bso; | |
62 | struct bfd_session *bs = NULL; | |
63 | bool is_shop, is_ipv4; | |
64 | ||
65 | TAILQ_FOREACH(bso, &bglobal.bg_obslist, bso_entry) { | |
66 | bs = bso->bso_bs; | |
67 | ||
68 | is_shop = !BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH); | |
69 | is_ipv4 = !BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_IPV6); | |
70 | /* Quick checks first. */ | |
71 | if (is_shop != (!bpc->bpc_mhop)) | |
72 | continue; | |
73 | if (is_ipv4 != bpc->bpc_ipv4) | |
74 | continue; | |
75 | ||
76 | /* | |
77 | * Slow lookup without hash because we don't have all | |
78 | * information yet. | |
79 | */ | |
80 | if (is_shop) { | |
81 | if (strcmp(bs->ifname, bpc->bpc_localif)) | |
82 | continue; | |
83 | if (memcmp(&bs->shop.peer, &bpc->bpc_peer, | |
84 | sizeof(bs->shop.peer))) | |
85 | continue; | |
86 | ||
87 | break; | |
88 | } | |
89 | ||
90 | if (strcmp(bs->vrfname, bpc->bpc_vrfname)) | |
91 | continue; | |
92 | if (memcmp(&bs->mhop.peer, &bpc->bpc_peer, | |
93 | sizeof(bs->mhop.peer))) | |
94 | continue; | |
95 | if (memcmp(&bs->mhop.local, &bpc->bpc_local, | |
96 | sizeof(bs->mhop.local))) | |
97 | continue; | |
98 | ||
99 | break; | |
100 | } | |
101 | if (bso == NULL) | |
102 | bs = NULL; | |
103 | ||
104 | return bs; | |
105 | } | |
106 | ||
e9e2c950 RZ |
107 | struct bfd_session *bs_peer_find(struct bfd_peer_cfg *bpc) |
108 | { | |
109 | struct bfd_session *bs; | |
110 | struct peer_label *pl; | |
b333abc2 RZ |
111 | struct interface *ifp; |
112 | struct vrf *vrf; | |
e9e2c950 RZ |
113 | struct bfd_mhop_key mhop; |
114 | struct bfd_shop_key shop; | |
115 | ||
116 | /* Try to find label first. */ | |
117 | if (bpc->bpc_has_label) { | |
118 | pl = pl_find(bpc->bpc_label); | |
119 | if (pl != NULL) { | |
120 | bs = pl->pl_bs; | |
121 | return bs; | |
122 | } | |
123 | } | |
124 | ||
125 | /* Otherwise fallback to peer/local hash lookup. */ | |
126 | if (bpc->bpc_mhop) { | |
127 | memset(&mhop, 0, sizeof(mhop)); | |
128 | mhop.peer = bpc->bpc_peer; | |
129 | mhop.local = bpc->bpc_local; | |
b333abc2 RZ |
130 | if (bpc->bpc_has_vrfname) { |
131 | vrf = vrf_lookup_by_name(bpc->bpc_vrfname); | |
132 | if (vrf == NULL) | |
133 | return NULL; | |
134 | ||
135 | mhop.vrfid = vrf->vrf_id; | |
136 | } | |
e9e2c950 RZ |
137 | |
138 | bs = bfd_mhop_lookup(mhop); | |
139 | } else { | |
140 | memset(&shop, 0, sizeof(shop)); | |
141 | shop.peer = bpc->bpc_peer; | |
b333abc2 RZ |
142 | if (bpc->bpc_has_localif) { |
143 | ifp = if_lookup_by_name_all_vrf(bpc->bpc_localif); | |
144 | if (ifp == NULL) | |
145 | return NULL; | |
146 | ||
147 | shop.ifindex = ifp->ifindex; | |
148 | } | |
e9e2c950 RZ |
149 | |
150 | bs = bfd_shop_lookup(shop); | |
151 | } | |
152 | ||
d245e522 RZ |
153 | if (bs != NULL) |
154 | return bs; | |
155 | ||
156 | /* Search for entries that are incomplete. */ | |
157 | return bs_peer_waiting_find(bpc); | |
158 | } | |
159 | ||
160 | /* | |
161 | * Starts a disabled BFD session. | |
162 | * | |
163 | * A session is disabled when the specified interface/VRF doesn't exist | |
164 | * yet. It might happen on FRR boot or with virtual interfaces. | |
165 | */ | |
166 | int bfd_session_enable(struct bfd_session *bs) | |
167 | { | |
168 | struct sockaddr_in6 *sin6; | |
169 | struct interface *ifp = NULL; | |
170 | struct vrf *vrf = NULL; | |
171 | int psock; | |
172 | ||
173 | /* | |
174 | * If the interface or VRF doesn't exist, then we must register | |
175 | * the session but delay its start. | |
176 | */ | |
177 | if (bs->ifname[0] != 0) { | |
178 | ifp = if_lookup_by_name_all_vrf(bs->ifname); | |
179 | if (ifp == NULL) { | |
180 | log_error( | |
181 | "session-enable: specified interface doesn't exists."); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | vrf = vrf_lookup_by_id(ifp->vrf_id); | |
186 | if (vrf == NULL) { | |
187 | log_error("session-enable: specified VRF doesn't exists."); | |
188 | return 0; | |
189 | } | |
190 | } | |
191 | ||
192 | if (bs->vrfname[0] != 0) { | |
193 | vrf = vrf_lookup_by_name(bs->vrfname); | |
194 | if (vrf == NULL) { | |
195 | log_error("session-enable: specified VRF doesn't exists."); | |
196 | return 0; | |
197 | } | |
198 | } | |
199 | ||
200 | /* Assign interface/VRF pointers. */ | |
201 | bs->vrf = vrf; | |
202 | if (bs->vrf == NULL) | |
203 | bs->vrf = vrf_lookup_by_id(VRF_DEFAULT); | |
204 | ||
205 | if (bs->ifname[0] != 0 && | |
206 | BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH) == 0) | |
207 | bs->ifp = ifp; | |
208 | ||
209 | /* Set the IPv6 scope id for link-local addresses. */ | |
210 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_IPV6)) { | |
211 | sin6 = &bs->mhop.peer.sa_sin6; | |
212 | if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) | |
213 | sin6->sin6_scope_id = bs->ifp != NULL | |
214 | ? bs->ifp->ifindex | |
215 | : IFINDEX_INTERNAL; | |
216 | ||
217 | sin6 = &bs->mhop.local.sa_sin6; | |
218 | if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) | |
219 | sin6->sin6_scope_id = bs->ifp != NULL | |
220 | ? bs->ifp->ifindex | |
221 | : IFINDEX_INTERNAL; | |
222 | ||
223 | bs->local_ip.sa_sin6 = *sin6; | |
224 | bs->local_address.sa_sin6 = *sin6; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Get socket for transmitting control packets. Note that if we | |
229 | * could use the destination port (3784) for the source | |
230 | * port we wouldn't need a socket per session. | |
231 | */ | |
232 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_IPV6) == 0) { | |
233 | psock = bp_peer_socket(bs); | |
234 | if (psock == -1) | |
235 | return -1; | |
236 | } else { | |
237 | psock = bp_peer_socketv6(bs); | |
238 | if (psock == -1) | |
239 | return -1; | |
240 | } | |
241 | ||
242 | /* | |
243 | * We've got a valid socket, lets start the timers and the | |
244 | * protocol. | |
245 | */ | |
246 | bs->sock = psock; | |
247 | bfd_recvtimer_update(bs); | |
248 | ptm_bfd_start_xmt_timer(bs, false); | |
249 | ||
250 | /* Registrate session into data structures. */ | |
251 | bs->discrs.my_discr = ptm_bfd_gen_ID(); | |
252 | bfd_id_insert(bs); | |
253 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) { | |
254 | if (vrf != NULL) | |
255 | bs->mhop.vrfid = vrf->vrf_id; | |
256 | else | |
257 | bs->mhop.vrfid = VRF_DEFAULT; | |
258 | ||
259 | bfd_mhop_insert(bs); | |
260 | } else { | |
261 | if (ifp != NULL) | |
262 | bs->shop.ifindex = ifp->ifindex; | |
263 | else | |
264 | bs->shop.ifindex = IFINDEX_INTERNAL; | |
265 | ||
266 | bfd_shop_insert(bs); | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Disabled a running BFD session. | |
274 | * | |
275 | * A session is disabled when the specified interface/VRF gets removed | |
276 | * (e.g. virtual interfaces). | |
277 | */ | |
278 | void bfd_session_disable(struct bfd_session *bs) | |
279 | { | |
280 | /* Free up socket resources. */ | |
281 | if (bs->sock != -1) { | |
282 | close(bs->sock); | |
283 | bs->sock = -1; | |
284 | } | |
285 | ||
286 | /* Disable all timers. */ | |
287 | bfd_recvtimer_delete(bs); | |
288 | bfd_echo_recvtimer_delete(bs); | |
289 | bfd_xmttimer_delete(bs); | |
290 | bfd_echo_xmttimer_delete(bs); | |
291 | ||
292 | /* Unregister session from hashes to avoid unwanted activation. */ | |
293 | bfd_id_delete(bs->discrs.my_discr); | |
294 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) | |
295 | bfd_mhop_delete(bs->mhop); | |
296 | else | |
297 | bfd_shop_delete(bs->shop); | |
e9e2c950 RZ |
298 | } |
299 | ||
300 | static uint32_t ptm_bfd_gen_ID(void) | |
301 | { | |
843b324d | 302 | uint32_t session_id; |
e9e2c950 | 303 | |
843b324d RZ |
304 | /* |
305 | * RFC 5880, Section 6.8.1. recommends that we should generate | |
306 | * random session identification numbers. | |
307 | */ | |
308 | do { | |
309 | session_id = ((random() << 16) & 0xFFFF0000) | |
310 | | (random() & 0x0000FFFF); | |
311 | } while (session_id == 0 || bfd_id_lookup(session_id) != NULL); | |
312 | ||
313 | return session_id; | |
e9e2c950 RZ |
314 | } |
315 | ||
316 | void ptm_bfd_start_xmt_timer(struct bfd_session *bfd, bool is_echo) | |
317 | { | |
318 | uint64_t jitter, xmt_TO; | |
319 | int maxpercent; | |
320 | ||
321 | xmt_TO = is_echo ? bfd->echo_xmt_TO : bfd->xmt_TO; | |
322 | ||
323 | /* | |
324 | * From section 6.5.2: trasmit interval should be randomly jittered | |
325 | * between | |
326 | * 75% and 100% of nominal value, unless detect_mult is 1, then should | |
327 | * be | |
328 | * between 75% and 90%. | |
329 | */ | |
330 | maxpercent = (bfd->detect_mult == 1) ? 16 : 26; | |
331 | jitter = (xmt_TO * (75 + (random() % maxpercent))) / 100; | |
332 | /* XXX remove that division above */ | |
333 | ||
334 | if (is_echo) | |
335 | bfd_echo_xmttimer_update(bfd, jitter); | |
336 | else | |
337 | bfd_xmttimer_update(bfd, jitter); | |
338 | } | |
339 | ||
340 | static void ptm_bfd_echo_xmt_TO(struct bfd_session *bfd) | |
341 | { | |
342 | /* Send the scheduled echo packet */ | |
343 | ptm_bfd_echo_snd(bfd); | |
344 | ||
345 | /* Restart the timer for next time */ | |
346 | ptm_bfd_start_xmt_timer(bfd, true); | |
347 | } | |
348 | ||
349 | void ptm_bfd_xmt_TO(struct bfd_session *bfd, int fbit) | |
350 | { | |
351 | /* Send the scheduled control packet */ | |
352 | ptm_bfd_snd(bfd, fbit); | |
353 | ||
354 | /* Restart the timer for next time */ | |
355 | ptm_bfd_start_xmt_timer(bfd, false); | |
356 | } | |
357 | ||
8bd859f6 | 358 | void ptm_bfd_echo_stop(struct bfd_session *bfd) |
e9e2c950 RZ |
359 | { |
360 | bfd->echo_xmt_TO = 0; | |
361 | bfd->echo_detect_TO = 0; | |
362 | BFD_UNSET_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE); | |
363 | ||
364 | bfd_echo_xmttimer_delete(bfd); | |
365 | bfd_echo_recvtimer_delete(bfd); | |
e9e2c950 RZ |
366 | } |
367 | ||
368 | void ptm_bfd_echo_start(struct bfd_session *bfd) | |
369 | { | |
370 | bfd->echo_detect_TO = (bfd->remote_detect_mult * bfd->echo_xmt_TO); | |
451eb5a2 RZ |
371 | if (bfd->echo_detect_TO > 0) |
372 | ptm_bfd_echo_xmt_TO(bfd); | |
e9e2c950 RZ |
373 | } |
374 | ||
375 | void ptm_bfd_ses_up(struct bfd_session *bfd) | |
376 | { | |
03e7f088 RZ |
377 | int old_state = bfd->ses_state; |
378 | ||
e9e2c950 RZ |
379 | bfd->local_diag = 0; |
380 | bfd->ses_state = PTM_BFD_UP; | |
e9e2c950 RZ |
381 | monotime(&bfd->uptime); |
382 | ||
c0ef9a8a RZ |
383 | /* Connection is up, lets negotiate timers. */ |
384 | bfd_set_polling(bfd); | |
385 | ||
386 | /* Start sending control packets with poll bit immediately. */ | |
387 | ptm_bfd_snd(bfd, 0); | |
e9e2c950 RZ |
388 | |
389 | control_notify(bfd); | |
390 | ||
0684c9b1 RZ |
391 | if (old_state != bfd->ses_state) { |
392 | bfd->stats.session_up++; | |
03e7f088 RZ |
393 | log_info("state-change: [%s] %s -> %s", bs_to_string(bfd), |
394 | state_list[old_state].str, | |
395 | state_list[bfd->ses_state].str); | |
0684c9b1 | 396 | } |
e9e2c950 RZ |
397 | } |
398 | ||
399 | void ptm_bfd_ses_dn(struct bfd_session *bfd, uint8_t diag) | |
400 | { | |
401 | int old_state = bfd->ses_state; | |
402 | ||
403 | bfd->local_diag = diag; | |
404 | bfd->discrs.remote_discr = 0; | |
405 | bfd->ses_state = PTM_BFD_DOWN; | |
406 | bfd->polling = 0; | |
407 | bfd->demand_mode = 0; | |
408 | monotime(&bfd->downtime); | |
409 | ||
410 | ptm_bfd_snd(bfd, 0); | |
411 | ||
b912b189 RZ |
412 | /* Slow down the control packets, the connection is down. */ |
413 | bs_set_slow_timers(bfd); | |
414 | ||
e9e2c950 RZ |
415 | /* only signal clients when going from up->down state */ |
416 | if (old_state == PTM_BFD_UP) | |
417 | control_notify(bfd); | |
418 | ||
e9e2c950 RZ |
419 | /* Stop echo packet transmission if they are active */ |
420 | if (BFD_CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) | |
8bd859f6 | 421 | ptm_bfd_echo_stop(bfd); |
03e7f088 | 422 | |
0684c9b1 RZ |
423 | if (old_state != bfd->ses_state) { |
424 | bfd->stats.session_down++; | |
03e7f088 RZ |
425 | log_info("state-change: [%s] %s -> %s reason:%s", |
426 | bs_to_string(bfd), state_list[old_state].str, | |
427 | state_list[bfd->ses_state].str, | |
428 | get_diag_str(bfd->local_diag)); | |
0684c9b1 | 429 | } |
e9e2c950 RZ |
430 | } |
431 | ||
e9e2c950 RZ |
432 | static struct bfd_session *bfd_find_disc(struct sockaddr_any *sa, |
433 | uint32_t ldisc) | |
434 | { | |
435 | struct bfd_session *bs; | |
436 | ||
437 | bs = bfd_id_lookup(ldisc); | |
438 | if (bs == NULL) | |
439 | return NULL; | |
440 | ||
441 | /* Remove unused fields. */ | |
442 | switch (sa->sa_sin.sin_family) { | |
443 | case AF_INET: | |
444 | sa->sa_sin.sin_port = 0; | |
445 | if (memcmp(sa, &bs->shop.peer, sizeof(sa->sa_sin)) == 0) | |
446 | return bs; | |
447 | break; | |
448 | case AF_INET6: | |
449 | sa->sa_sin6.sin6_port = 0; | |
450 | if (memcmp(sa, &bs->shop.peer, sizeof(sa->sa_sin6)) == 0) | |
451 | return bs; | |
452 | break; | |
453 | } | |
454 | ||
455 | return NULL; | |
456 | } | |
457 | ||
b333abc2 | 458 | struct bfd_session *ptm_bfd_sess_find(struct bfd_pkt *cp, |
e9e2c950 RZ |
459 | struct sockaddr_any *peer, |
460 | struct sockaddr_any *local, | |
b333abc2 RZ |
461 | ifindex_t ifindex, vrf_id_t vrfid, |
462 | bool is_mhop) | |
e9e2c950 RZ |
463 | { |
464 | struct bfd_session *l_bfd = NULL; | |
465 | struct bfd_mhop_key mhop; | |
466 | struct bfd_shop_key shop; | |
e9e2c950 | 467 | |
9d63adda RZ |
468 | /* Find our session using the ID signaled by the remote end. */ |
469 | if (cp->discrs.remote_discr) | |
470 | return bfd_find_disc(peer, ntohl(cp->discrs.remote_discr)); | |
471 | ||
472 | /* Search for session without using discriminator. */ | |
473 | if (is_mhop) { | |
474 | memset(&mhop, 0, sizeof(mhop)); | |
475 | mhop.peer = *peer; | |
476 | mhop.local = *local; | |
b333abc2 | 477 | mhop.vrfid = vrfid; |
e9e2c950 | 478 | |
9d63adda RZ |
479 | l_bfd = bfd_mhop_lookup(mhop); |
480 | } else { | |
481 | memset(&shop, 0, sizeof(shop)); | |
482 | shop.peer = *peer; | |
b333abc2 | 483 | shop.ifindex = ifindex; |
9d63adda RZ |
484 | |
485 | l_bfd = bfd_shop_lookup(shop); | |
e9e2c950 RZ |
486 | } |
487 | ||
9d63adda RZ |
488 | /* XXX maybe remoteDiscr should be checked for remoteHeard cases. */ |
489 | return l_bfd; | |
e9e2c950 RZ |
490 | } |
491 | ||
e9e2c950 RZ |
492 | int bfd_xmt_cb(struct thread *t) |
493 | { | |
494 | struct bfd_session *bs = THREAD_ARG(t); | |
495 | ||
496 | ptm_bfd_xmt_TO(bs, 0); | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | int bfd_echo_xmt_cb(struct thread *t) | |
502 | { | |
503 | struct bfd_session *bs = THREAD_ARG(t); | |
504 | ||
451eb5a2 RZ |
505 | if (bs->echo_xmt_TO > 0) |
506 | ptm_bfd_echo_xmt_TO(bs); | |
e9e2c950 RZ |
507 | |
508 | return 0; | |
509 | } | |
510 | ||
511 | /* Was ptm_bfd_detect_TO() */ | |
512 | int bfd_recvtimer_cb(struct thread *t) | |
513 | { | |
514 | struct bfd_session *bs = THREAD_ARG(t); | |
e9e2c950 RZ |
515 | |
516 | switch (bs->ses_state) { | |
517 | case PTM_BFD_INIT: | |
518 | case PTM_BFD_UP: | |
40675ea9 | 519 | ptm_bfd_ses_dn(bs, BD_CONTROL_EXPIRED); |
e9e2c950 RZ |
520 | bfd_recvtimer_update(bs); |
521 | break; | |
522 | ||
523 | default: | |
524 | /* Second detect time expiration, zero remote discr (section | |
525 | * 6.5.1) | |
526 | */ | |
527 | bs->discrs.remote_discr = 0; | |
528 | break; | |
529 | } | |
530 | ||
e9e2c950 RZ |
531 | return 0; |
532 | } | |
533 | ||
534 | /* Was ptm_bfd_echo_detect_TO() */ | |
535 | int bfd_echo_recvtimer_cb(struct thread *t) | |
536 | { | |
537 | struct bfd_session *bs = THREAD_ARG(t); | |
e9e2c950 RZ |
538 | |
539 | switch (bs->ses_state) { | |
540 | case PTM_BFD_INIT: | |
541 | case PTM_BFD_UP: | |
40675ea9 | 542 | ptm_bfd_ses_dn(bs, BD_ECHO_FAILED); |
e9e2c950 RZ |
543 | break; |
544 | } | |
545 | ||
e9e2c950 RZ |
546 | return 0; |
547 | } | |
548 | ||
d245e522 | 549 | static struct bfd_session *bfd_session_new(void) |
e9e2c950 RZ |
550 | { |
551 | struct bfd_session *bs; | |
552 | ||
553 | bs = XCALLOC(MTYPE_BFDD_CONFIG, sizeof(*bs)); | |
554 | if (bs == NULL) | |
555 | return NULL; | |
556 | ||
557 | QOBJ_REG(bs, bfd_session); | |
558 | ||
f43b9368 | 559 | bs->timers.desired_min_tx = BFD_DEFDESIREDMINTX; |
e9e2c950 RZ |
560 | bs->timers.required_min_rx = BFD_DEFREQUIREDMINRX; |
561 | bs->timers.required_min_echo = BFD_DEF_REQ_MIN_ECHO; | |
562 | bs->detect_mult = BFD_DEFDETECTMULT; | |
563 | bs->mh_ttl = BFD_DEF_MHOP_TTL; | |
d245e522 | 564 | bs->ses_state = PTM_BFD_DOWN; |
e9e2c950 | 565 | |
b912b189 RZ |
566 | /* Initiate connection with slow timers. */ |
567 | bs_set_slow_timers(bs); | |
f43b9368 RZ |
568 | |
569 | /* Initiate remote settings as well. */ | |
570 | bs->remote_timers = bs->cur_timers; | |
571 | bs->remote_detect_mult = BFD_DEFDETECTMULT; | |
572 | ||
d245e522 | 573 | bs->sock = -1; |
e9e2c950 RZ |
574 | monotime(&bs->uptime); |
575 | bs->downtime = bs->uptime; | |
576 | ||
577 | return bs; | |
578 | } | |
579 | ||
580 | int bfd_session_update_label(struct bfd_session *bs, const char *nlabel) | |
581 | { | |
582 | /* New label treatment: | |
583 | * - Check if the label is taken; | |
584 | * - Try to allocate the memory for it and register; | |
585 | */ | |
586 | if (bs->pl == NULL) { | |
587 | if (pl_find(nlabel) != NULL) { | |
588 | /* Someone is already using it. */ | |
589 | return -1; | |
590 | } | |
591 | ||
592 | if (pl_new(nlabel, bs) == NULL) | |
593 | return -1; | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Test label change consistency: | |
600 | * - Do nothing if it's the same label; | |
601 | * - Check if the future label is already taken; | |
602 | * - Change label; | |
603 | */ | |
604 | if (strcmp(nlabel, bs->pl->pl_label) == 0) | |
605 | return -1; | |
606 | if (pl_find(nlabel) != NULL) | |
607 | return -1; | |
608 | ||
609 | strlcpy(bs->pl->pl_label, nlabel, sizeof(bs->pl->pl_label)); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | static void _bfd_session_update(struct bfd_session *bs, | |
614 | struct bfd_peer_cfg *bpc) | |
615 | { | |
616 | if (bpc->bpc_echo) { | |
617 | /* Check if echo mode is already active. */ | |
618 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO)) | |
619 | goto skip_echo; | |
620 | ||
621 | BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_ECHO); | |
e9e2c950 RZ |
622 | |
623 | /* Activate/update echo receive timeout timer. */ | |
73c62f8e | 624 | bs_echo_timer_handler(bs); |
e9e2c950 RZ |
625 | } else { |
626 | /* Check if echo mode is already disabled. */ | |
627 | if (!BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO)) | |
628 | goto skip_echo; | |
629 | ||
630 | BFD_UNSET_FLAG(bs->flags, BFD_SESS_FLAG_ECHO); | |
8bd859f6 | 631 | ptm_bfd_echo_stop(bs); |
e9e2c950 RZ |
632 | } |
633 | ||
634 | skip_echo: | |
635 | if (bpc->bpc_has_txinterval) | |
f43b9368 | 636 | bs->timers.desired_min_tx = bpc->bpc_txinterval * 1000; |
e9e2c950 RZ |
637 | |
638 | if (bpc->bpc_has_recvinterval) | |
639 | bs->timers.required_min_rx = bpc->bpc_recvinterval * 1000; | |
640 | ||
641 | if (bpc->bpc_has_detectmultiplier) | |
642 | bs->detect_mult = bpc->bpc_detectmultiplier; | |
643 | ||
644 | if (bpc->bpc_has_echointerval) | |
645 | bs->timers.required_min_echo = bpc->bpc_echointerval * 1000; | |
646 | ||
647 | if (bpc->bpc_has_label) | |
648 | bfd_session_update_label(bs, bpc->bpc_label); | |
649 | ||
650 | if (bpc->bpc_shutdown) { | |
651 | /* Check if already shutdown. */ | |
652 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN)) | |
653 | return; | |
654 | ||
655 | BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN); | |
656 | ||
657 | /* Disable all events. */ | |
658 | bfd_recvtimer_delete(bs); | |
659 | bfd_echo_recvtimer_delete(bs); | |
660 | bfd_xmttimer_delete(bs); | |
661 | bfd_echo_xmttimer_delete(bs); | |
662 | ||
663 | /* Change and notify state change. */ | |
664 | bs->ses_state = PTM_BFD_ADM_DOWN; | |
665 | control_notify(bs); | |
666 | ||
d245e522 RZ |
667 | /* Don't try to send packets with a disabled session. */ |
668 | if (bs->sock != -1) | |
669 | ptm_bfd_snd(bs, 0); | |
e9e2c950 RZ |
670 | } else { |
671 | /* Check if already working. */ | |
672 | if (!BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN)) | |
673 | return; | |
674 | ||
675 | BFD_UNSET_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN); | |
676 | ||
677 | /* Change and notify state change. */ | |
678 | bs->ses_state = PTM_BFD_DOWN; | |
679 | control_notify(bs); | |
680 | ||
681 | /* Enable all timers. */ | |
682 | bfd_recvtimer_update(bs); | |
683 | bfd_xmttimer_update(bs, bs->xmt_TO); | |
e9e2c950 RZ |
684 | } |
685 | } | |
686 | ||
687 | static int bfd_session_update(struct bfd_session *bs, struct bfd_peer_cfg *bpc) | |
688 | { | |
689 | /* User didn't want to update, return failure. */ | |
690 | if (bpc->bpc_createonly) | |
691 | return -1; | |
692 | ||
693 | _bfd_session_update(bs, bpc); | |
694 | ||
e9e2c950 RZ |
695 | control_notify_config(BCM_NOTIFY_CONFIG_UPDATE, bs); |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | static void bfd_session_free(struct bfd_session *bs) | |
701 | { | |
d245e522 | 702 | struct bfd_session_observer *bso; |
e9e2c950 | 703 | |
d245e522 | 704 | bfd_session_disable(bs); |
e9e2c950 | 705 | |
d245e522 RZ |
706 | /* Remove observer if any. */ |
707 | TAILQ_FOREACH(bso, &bglobal.bg_obslist, bso_entry) { | |
708 | if (bso->bso_bs != bs) | |
709 | continue; | |
710 | ||
711 | break; | |
712 | } | |
713 | if (bso != NULL) | |
714 | bs_observer_del(bso); | |
e9e2c950 RZ |
715 | |
716 | pl_free(bs->pl); | |
717 | ||
718 | QOBJ_UNREG(bs); | |
719 | XFREE(MTYPE_BFDD_CONFIG, bs); | |
720 | } | |
721 | ||
722 | struct bfd_session *ptm_bfd_sess_new(struct bfd_peer_cfg *bpc) | |
723 | { | |
724 | struct bfd_session *bfd, *l_bfd; | |
e9e2c950 RZ |
725 | |
726 | /* check to see if this needs a new session */ | |
727 | l_bfd = bs_peer_find(bpc); | |
728 | if (l_bfd) { | |
729 | /* Requesting a duplicated peer means update configuration. */ | |
730 | if (bfd_session_update(l_bfd, bpc) == 0) | |
731 | return l_bfd; | |
732 | else | |
733 | return NULL; | |
734 | } | |
735 | ||
d245e522 RZ |
736 | /* Get BFD session storage with its defaults. */ |
737 | bfd = bfd_session_new(); | |
e9e2c950 | 738 | if (bfd == NULL) { |
03e7f088 | 739 | log_error("session-new: allocation failed"); |
e9e2c950 RZ |
740 | return NULL; |
741 | } | |
742 | ||
d245e522 RZ |
743 | /* |
744 | * Store interface/VRF name in case we need to delay session | |
745 | * start. See `bfd_session_enable` for more information. | |
746 | */ | |
747 | if (bpc->bpc_has_localif) | |
748 | strlcpy(bfd->ifname, bpc->bpc_localif, sizeof(bfd->ifname)); | |
e9e2c950 | 749 | |
d245e522 RZ |
750 | if (bpc->bpc_has_vrfname) |
751 | strlcpy(bfd->vrfname, bpc->bpc_vrfname, sizeof(bfd->vrfname)); | |
e9e2c950 | 752 | |
d245e522 RZ |
753 | /* Add observer if we have moving parts. */ |
754 | if (bfd->ifname[0] || bfd->vrfname[0]) | |
755 | bs_observer_add(bfd); | |
43adc702 | 756 | |
d245e522 RZ |
757 | /* Copy remaining data. */ |
758 | if (bpc->bpc_ipv4 == false) | |
759 | BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_IPV6); | |
e9e2c950 RZ |
760 | |
761 | if (bpc->bpc_mhop) { | |
762 | BFD_SET_FLAG(bfd->flags, BFD_SESS_FLAG_MH); | |
763 | bfd->mhop.peer = bpc->bpc_peer; | |
764 | bfd->mhop.local = bpc->bpc_local; | |
e9e2c950 RZ |
765 | } else { |
766 | bfd->shop.peer = bpc->bpc_peer; | |
d245e522 | 767 | } |
e9e2c950 | 768 | |
d245e522 RZ |
769 | bfd->local_ip = bpc->bpc_local; |
770 | bfd->local_address = bpc->bpc_local; | |
771 | ||
772 | /* Try to enable session and schedule for packet receive/send. */ | |
773 | if (bfd_session_enable(bfd) == -1) { | |
774 | /* Unrecoverable failure, remove the session/peer. */ | |
775 | bfd_session_free(bfd); | |
776 | return NULL; | |
e9e2c950 RZ |
777 | } |
778 | ||
d245e522 | 779 | /* Apply other configurations. */ |
e9e2c950 RZ |
780 | _bfd_session_update(bfd, bpc); |
781 | ||
03e7f088 | 782 | log_info("session-new: %s", bs_to_string(bfd)); |
e9e2c950 RZ |
783 | |
784 | control_notify_config(BCM_NOTIFY_CONFIG_ADD, bfd); | |
785 | ||
786 | return bfd; | |
787 | } | |
788 | ||
789 | int ptm_bfd_ses_del(struct bfd_peer_cfg *bpc) | |
790 | { | |
791 | struct bfd_session *bs; | |
792 | ||
793 | /* Find session and call free(). */ | |
794 | bs = bs_peer_find(bpc); | |
795 | if (bs == NULL) | |
796 | return -1; | |
797 | ||
798 | /* This pointer is being referenced, don't let it be deleted. */ | |
799 | if (bs->refcount > 0) { | |
03e7f088 RZ |
800 | log_error("session-delete: refcount failure: %" PRIu64 |
801 | " references", | |
802 | bs->refcount); | |
e9e2c950 RZ |
803 | return -1; |
804 | } | |
805 | ||
03e7f088 | 806 | log_info("session-delete: %s", bs_to_string(bs)); |
e9e2c950 RZ |
807 | |
808 | control_notify_config(BCM_NOTIFY_CONFIG_DELETE, bs); | |
809 | ||
810 | bfd_session_free(bs); | |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
d3f3a2c4 RZ |
815 | void bfd_set_polling(struct bfd_session *bs) |
816 | { | |
c0ef9a8a RZ |
817 | /* |
818 | * Start polling procedure: the only timers that require polling | |
819 | * to change value without losing connection are: | |
820 | * | |
821 | * - Desired minimum transmission interval; | |
822 | * - Required minimum receive interval; | |
823 | * | |
824 | * RFC 5880, Section 6.8.3. | |
825 | */ | |
d3f3a2c4 RZ |
826 | bs->polling = 1; |
827 | } | |
828 | ||
aef131af RZ |
829 | /* |
830 | * bs_<state>_handler() functions implement the BFD state machine | |
831 | * transition mechanism. `<state>` is the current session state and | |
832 | * the parameter `nstate` is the peer new state. | |
833 | */ | |
9f37770f RZ |
834 | static void bs_admin_down_handler(struct bfd_session *bs |
835 | __attribute__((__unused__)), | |
836 | int nstate __attribute__((__unused__))) | |
aef131af RZ |
837 | { |
838 | /* | |
839 | * We are administratively down, there is no state machine | |
840 | * handling. | |
841 | */ | |
842 | } | |
843 | ||
9f37770f | 844 | static void bs_down_handler(struct bfd_session *bs, int nstate) |
aef131af RZ |
845 | { |
846 | switch (nstate) { | |
847 | case PTM_BFD_ADM_DOWN: | |
848 | /* | |
849 | * Remote peer doesn't want to talk, so lets keep the | |
850 | * connection down. | |
851 | */ | |
852 | case PTM_BFD_UP: | |
853 | /* Peer can't be up yet, wait it go to 'init' or 'down'. */ | |
854 | break; | |
855 | ||
856 | case PTM_BFD_DOWN: | |
857 | /* | |
858 | * Remote peer agreed that the path is down, lets try to | |
859 | * bring it up. | |
860 | */ | |
861 | bs->ses_state = PTM_BFD_INIT; | |
862 | break; | |
863 | ||
864 | case PTM_BFD_INIT: | |
865 | /* | |
866 | * Remote peer told us his path is up, lets turn | |
867 | * activate the session. | |
868 | */ | |
869 | ptm_bfd_ses_up(bs); | |
870 | break; | |
871 | ||
872 | default: | |
873 | log_debug("state-change: unhandled neighbor state: %d", nstate); | |
874 | break; | |
875 | } | |
876 | } | |
877 | ||
9f37770f | 878 | static void bs_init_handler(struct bfd_session *bs, int nstate) |
aef131af RZ |
879 | { |
880 | switch (nstate) { | |
881 | case PTM_BFD_ADM_DOWN: | |
882 | /* | |
883 | * Remote peer doesn't want to talk, so lets make the | |
884 | * connection down. | |
885 | */ | |
886 | bs->ses_state = PTM_BFD_DOWN; | |
887 | break; | |
888 | ||
889 | case PTM_BFD_DOWN: | |
890 | /* Remote peer hasn't moved to first stage yet. */ | |
891 | break; | |
892 | ||
893 | case PTM_BFD_INIT: | |
894 | case PTM_BFD_UP: | |
895 | /* We agreed on the settings and the path is up. */ | |
896 | ptm_bfd_ses_up(bs); | |
897 | break; | |
898 | ||
899 | default: | |
900 | log_debug("state-change: unhandled neighbor state: %d", nstate); | |
901 | break; | |
902 | } | |
903 | } | |
904 | ||
9f37770f | 905 | static void bs_up_handler(struct bfd_session *bs, int nstate) |
aef131af RZ |
906 | { |
907 | switch (nstate) { | |
908 | case PTM_BFD_ADM_DOWN: | |
909 | case PTM_BFD_DOWN: | |
910 | /* Peer lost or asked to shutdown connection. */ | |
911 | ptm_bfd_ses_dn(bs, BD_NEIGHBOR_DOWN); | |
912 | break; | |
913 | ||
914 | case PTM_BFD_INIT: | |
915 | case PTM_BFD_UP: | |
916 | /* Path is up and working. */ | |
917 | break; | |
918 | ||
919 | default: | |
920 | log_debug("state-change: unhandled neighbor state: %d", nstate); | |
921 | break; | |
922 | } | |
923 | } | |
924 | ||
925 | void bs_state_handler(struct bfd_session *bs, int nstate) | |
926 | { | |
927 | switch (bs->ses_state) { | |
928 | case PTM_BFD_ADM_DOWN: | |
929 | bs_admin_down_handler(bs, nstate); | |
930 | break; | |
931 | case PTM_BFD_DOWN: | |
932 | bs_down_handler(bs, nstate); | |
933 | break; | |
934 | case PTM_BFD_INIT: | |
935 | bs_init_handler(bs, nstate); | |
936 | break; | |
937 | case PTM_BFD_UP: | |
938 | bs_up_handler(bs, nstate); | |
939 | break; | |
940 | ||
941 | default: | |
942 | log_debug("state-change: [%s] is in invalid state: %d", | |
943 | bs_to_string(bs), nstate); | |
944 | break; | |
945 | } | |
946 | } | |
947 | ||
c0ef9a8a RZ |
948 | /* |
949 | * Handles echo timer manipulation after updating timer. | |
950 | */ | |
951 | void bs_echo_timer_handler(struct bfd_session *bs) | |
952 | { | |
953 | uint32_t old_timer; | |
954 | ||
955 | /* | |
956 | * Before doing any echo handling, check if it is possible to | |
957 | * use it. | |
958 | * | |
959 | * - Check for `echo-mode` configuration. | |
960 | * - Check that we are not using multi hop (RFC 5883, | |
961 | * Section 3). | |
962 | * - Check that we are already at the up state. | |
963 | */ | |
964 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO) == 0 | |
965 | || BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH) | |
966 | || bs->ses_state != PTM_BFD_UP) | |
967 | return; | |
968 | ||
969 | /* Remote peer asked to stop echo. */ | |
970 | if (bs->remote_timers.required_min_echo == 0) { | |
971 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO_ACTIVE)) | |
8bd859f6 | 972 | ptm_bfd_echo_stop(bs); |
c0ef9a8a RZ |
973 | |
974 | return; | |
975 | } | |
976 | ||
977 | /* | |
978 | * Calculate the echo transmission timer: we must not send | |
979 | * echo packets faster than the minimum required time | |
980 | * announced by the remote system. | |
981 | * | |
982 | * RFC 5880, Section 6.8.9. | |
983 | */ | |
984 | old_timer = bs->echo_xmt_TO; | |
985 | if (bs->remote_timers.required_min_echo > bs->timers.required_min_echo) | |
986 | bs->echo_xmt_TO = bs->remote_timers.required_min_echo; | |
987 | else | |
988 | bs->echo_xmt_TO = bs->timers.required_min_echo; | |
989 | ||
990 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO_ACTIVE) == 0 | |
991 | || old_timer != bs->echo_xmt_TO) | |
992 | ptm_bfd_echo_start(bs); | |
993 | } | |
994 | ||
995 | /* | |
996 | * RFC 5880 Section 6.5. | |
997 | * | |
998 | * When a BFD control packet with the final bit is received, we must | |
999 | * update the session parameters. | |
1000 | */ | |
1001 | void bs_final_handler(struct bfd_session *bs) | |
1002 | { | |
1003 | /* Start using our new timers. */ | |
f43b9368 RZ |
1004 | bs->cur_timers.desired_min_tx = bs->timers.desired_min_tx; |
1005 | bs->cur_timers.required_min_rx = bs->timers.required_min_rx; | |
c0ef9a8a RZ |
1006 | |
1007 | /* | |
1008 | * TODO: demand mode. See RFC 5880 Section 6.1. | |
1009 | * | |
1010 | * When using demand mode we must disable the detection timer | |
1011 | * for lost control packets. | |
1012 | */ | |
1013 | if (bs->demand_mode) { | |
1014 | /* Notify watchers about changed timers. */ | |
1015 | control_notify_config(BCM_NOTIFY_CONFIG_UPDATE, bs); | |
1016 | return; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * Calculate detection time based on new timers. | |
1021 | * | |
1022 | * Transmission calculation: | |
1023 | * We must respect the RequiredMinRxInterval from the remote | |
1024 | * system: if our desired transmission timer is more than the | |
1025 | * minimum receive rate, then we must lower it to at least the | |
1026 | * minimum receive interval. | |
1027 | * | |
1028 | * RFC 5880, Section 6.8.3. | |
1029 | */ | |
1030 | if (bs->timers.desired_min_tx > bs->remote_timers.required_min_rx) | |
1031 | bs->xmt_TO = bs->remote_timers.required_min_rx; | |
1032 | else | |
1033 | bs->xmt_TO = bs->timers.desired_min_tx; | |
1034 | ||
1035 | /* Apply new transmission timer immediately. */ | |
1036 | ptm_bfd_start_xmt_timer(bs, false); | |
1037 | ||
1038 | /* | |
1039 | * Detection timeout calculation: | |
1040 | * The minimum detection timeout is the remote detection | |
1041 | * multipler (number of packets to be missed) times the agreed | |
1042 | * transmission interval. | |
1043 | * | |
1044 | * RFC 5880, Section 6.8.4. | |
1045 | * | |
1046 | * TODO: support sending/counting more packets inside detection | |
1047 | * timeout. | |
1048 | */ | |
1049 | if (bs->remote_timers.required_min_rx > bs->timers.desired_min_tx) | |
1050 | bs->detect_TO = bs->remote_detect_mult | |
1051 | * bs->remote_timers.required_min_rx; | |
1052 | else | |
1053 | bs->detect_TO = bs->remote_detect_mult | |
1054 | * bs->timers.desired_min_tx; | |
1055 | ||
1056 | /* Apply new receive timer immediately. */ | |
1057 | bfd_recvtimer_update(bs); | |
1058 | ||
1059 | /* Notify watchers about changed timers. */ | |
1060 | control_notify_config(BCM_NOTIFY_CONFIG_UPDATE, bs); | |
1061 | } | |
1062 | ||
b912b189 RZ |
1063 | void bs_set_slow_timers(struct bfd_session *bs) |
1064 | { | |
1065 | /* | |
1066 | * BFD connection must use slow timers before going up or after | |
1067 | * losing connectivity to avoid wasting bandwidth. | |
1068 | * | |
1069 | * RFC 5880, Section 6.8.3. | |
1070 | */ | |
1071 | bs->cur_timers.desired_min_tx = BFD_DEF_SLOWTX; | |
1072 | bs->cur_timers.required_min_rx = BFD_DEF_SLOWTX; | |
1073 | bs->cur_timers.required_min_echo = 0; | |
1074 | ||
1075 | /* Set the appropriated timeouts for slow connection. */ | |
1076 | bs->detect_TO = (BFD_DEFDETECTMULT * BFD_DEF_SLOWTX); | |
1077 | bs->xmt_TO = BFD_DEF_SLOWTX; | |
1078 | } | |
e9e2c950 RZ |
1079 | |
1080 | /* | |
1081 | * Helper functions. | |
1082 | */ | |
1083 | static const char *get_diag_str(int diag) | |
1084 | { | |
1085 | for (int i = 0; diag_list[i].str; i++) { | |
1086 | if (diag_list[i].type == diag) | |
1087 | return diag_list[i].str; | |
1088 | } | |
1089 | return "N/A"; | |
1090 | } | |
1091 | ||
1092 | const char *satostr(struct sockaddr_any *sa) | |
1093 | { | |
1094 | #define INETSTR_BUFCOUNT 8 | |
1095 | static char buf[INETSTR_BUFCOUNT][INET6_ADDRSTRLEN]; | |
1096 | static int bufidx; | |
1097 | struct sockaddr_in *sin = &sa->sa_sin; | |
1098 | struct sockaddr_in6 *sin6 = &sa->sa_sin6; | |
1099 | ||
1100 | bufidx += (bufidx + 1) % INETSTR_BUFCOUNT; | |
1101 | buf[bufidx][0] = 0; | |
1102 | ||
1103 | switch (sin->sin_family) { | |
1104 | case AF_INET: | |
1105 | inet_ntop(AF_INET, &sin->sin_addr, buf[bufidx], | |
1106 | sizeof(buf[bufidx])); | |
1107 | break; | |
1108 | case AF_INET6: | |
1109 | inet_ntop(AF_INET6, &sin6->sin6_addr, buf[bufidx], | |
1110 | sizeof(buf[bufidx])); | |
1111 | break; | |
1112 | ||
1113 | default: | |
1114 | strlcpy(buf[bufidx], "unknown", sizeof(buf[bufidx])); | |
1115 | break; | |
1116 | } | |
1117 | ||
1118 | return buf[bufidx]; | |
1119 | } | |
1120 | ||
1121 | const char *diag2str(uint8_t diag) | |
1122 | { | |
1123 | switch (diag) { | |
1124 | case 0: | |
1125 | return "ok"; | |
1126 | case 1: | |
1127 | return "control detection time expired"; | |
1128 | case 2: | |
1129 | return "echo function failed"; | |
1130 | case 3: | |
1131 | return "neighbor signaled session down"; | |
1132 | case 4: | |
1133 | return "forwarding plane reset"; | |
1134 | case 5: | |
1135 | return "path down"; | |
1136 | case 6: | |
1137 | return "concatenated path down"; | |
1138 | case 7: | |
1139 | return "administratively down"; | |
1140 | case 8: | |
1141 | return "reverse concatenated path down"; | |
1142 | default: | |
1143 | return "unknown"; | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | int strtosa(const char *addr, struct sockaddr_any *sa) | |
1148 | { | |
1149 | memset(sa, 0, sizeof(*sa)); | |
1150 | ||
1151 | if (inet_pton(AF_INET, addr, &sa->sa_sin.sin_addr) == 1) { | |
1152 | sa->sa_sin.sin_family = AF_INET; | |
1153 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1154 | sa->sa_sin.sin_len = sizeof(sa->sa_sin); | |
1155 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | if (inet_pton(AF_INET6, addr, &sa->sa_sin6.sin6_addr) == 1) { | |
1160 | sa->sa_sin6.sin6_family = AF_INET6; | |
1161 | #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN | |
1162 | sa->sa_sin6.sin6_len = sizeof(sa->sa_sin6); | |
1163 | #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ | |
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | return -1; | |
1168 | } | |
1169 | ||
1170 | void integer2timestr(uint64_t time, char *buf, size_t buflen) | |
1171 | { | |
1172 | unsigned int year, month, day, hour, minute, second; | |
1173 | int rv; | |
1174 | ||
1175 | #define MINUTES (60) | |
23586b05 DS |
1176 | #define HOURS (60 * MINUTES) |
1177 | #define DAYS (24 * HOURS) | |
1178 | #define MONTHS (30 * DAYS) | |
1179 | #define YEARS (12 * MONTHS) | |
e9e2c950 RZ |
1180 | if (time >= YEARS) { |
1181 | year = time / YEARS; | |
1182 | time -= year * YEARS; | |
1183 | ||
1184 | rv = snprintf(buf, buflen, "%u year(s), ", year); | |
1185 | buf += rv; | |
1186 | buflen -= rv; | |
1187 | } | |
1188 | if (time >= MONTHS) { | |
1189 | month = time / MONTHS; | |
1190 | time -= month * MONTHS; | |
1191 | ||
1192 | rv = snprintf(buf, buflen, "%u month(s), ", month); | |
1193 | buf += rv; | |
1194 | buflen -= rv; | |
1195 | } | |
1196 | if (time >= DAYS) { | |
1197 | day = time / DAYS; | |
1198 | time -= day * DAYS; | |
1199 | ||
1200 | rv = snprintf(buf, buflen, "%u day(s), ", day); | |
1201 | buf += rv; | |
1202 | buflen -= rv; | |
1203 | } | |
1204 | if (time >= HOURS) { | |
1205 | hour = time / HOURS; | |
1206 | time -= hour * HOURS; | |
1207 | ||
1208 | rv = snprintf(buf, buflen, "%u hour(s), ", hour); | |
1209 | buf += rv; | |
1210 | buflen -= rv; | |
1211 | } | |
1212 | if (time >= MINUTES) { | |
1213 | minute = time / MINUTES; | |
1214 | time -= minute * MINUTES; | |
1215 | ||
1216 | rv = snprintf(buf, buflen, "%u minute(s), ", minute); | |
1217 | buf += rv; | |
1218 | buflen -= rv; | |
1219 | } | |
1220 | second = time % MINUTES; | |
1221 | snprintf(buf, buflen, "%u second(s)", second); | |
1222 | } | |
1223 | ||
03e7f088 RZ |
1224 | const char *bs_to_string(struct bfd_session *bs) |
1225 | { | |
1226 | static char buf[256]; | |
1227 | int pos; | |
1228 | bool is_mhop = BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH); | |
1229 | ||
1230 | pos = snprintf(buf, sizeof(buf), "mhop:%s", is_mhop ? "yes" : "no"); | |
1231 | if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH)) { | |
1232 | pos += snprintf(buf + pos, sizeof(buf) - pos, | |
1233 | " peer:%s local:%s", satostr(&bs->mhop.peer), | |
1234 | satostr(&bs->mhop.local)); | |
1235 | ||
b333abc2 RZ |
1236 | if (bs->mhop.vrfid != VRF_DEFAULT) |
1237 | snprintf(buf + pos, sizeof(buf) - pos, " vrf:%u", | |
1238 | bs->mhop.vrfid); | |
03e7f088 RZ |
1239 | } else { |
1240 | pos += snprintf(buf + pos, sizeof(buf) - pos, " peer:%s", | |
1241 | satostr(&bs->shop.peer)); | |
1242 | ||
1243 | if (bs->local_address.sa_sin.sin_family) | |
1244 | pos += snprintf(buf + pos, sizeof(buf) - pos, | |
1245 | " local:%s", | |
1246 | satostr(&bs->local_address)); | |
1247 | ||
b333abc2 RZ |
1248 | if (bs->shop.ifindex) |
1249 | snprintf(buf + pos, sizeof(buf) - pos, " ifindex:%u", | |
1250 | bs->shop.ifindex); | |
03e7f088 RZ |
1251 | } |
1252 | ||
1253 | return buf; | |
1254 | } | |
1255 | ||
d245e522 RZ |
1256 | int bs_observer_add(struct bfd_session *bs) |
1257 | { | |
1258 | struct bfd_session_observer *bso; | |
1259 | ||
1260 | bso = XMALLOC(MTYPE_BFDD_SESSION_OBSERVER, sizeof(*bso)); | |
1261 | bso->bso_bs = bs; | |
1262 | bso->bso_isinterface = !BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH); | |
1263 | if (bso->bso_isinterface) | |
1264 | strlcpy(bso->bso_entryname, bs->ifname, | |
1265 | sizeof(bso->bso_entryname)); | |
1266 | else | |
1267 | strlcpy(bso->bso_entryname, bs->vrfname, | |
1268 | sizeof(bso->bso_entryname)); | |
1269 | ||
1270 | TAILQ_INSERT_TAIL(&bglobal.bg_obslist, bso, bso_entry); | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | void bs_observer_del(struct bfd_session_observer *bso) | |
1276 | { | |
1277 | TAILQ_REMOVE(&bglobal.bg_obslist, bso, bso_entry); | |
1278 | XFREE(MTYPE_BFDD_SESSION_OBSERVER, bso); | |
1279 | } | |
1280 | ||
e9e2c950 RZ |
1281 | |
1282 | /* | |
1283 | * BFD hash data structures to find sessions. | |
1284 | */ | |
1285 | static struct hash *bfd_id_hash; | |
1286 | static struct hash *bfd_shop_hash; | |
1287 | static struct hash *bfd_mhop_hash; | |
e9e2c950 RZ |
1288 | |
1289 | static unsigned int bfd_id_hash_do(void *p); | |
e9e2c950 | 1290 | static unsigned int bfd_shop_hash_do(void *p); |
e9e2c950 | 1291 | static unsigned int bfd_mhop_hash_do(void *p); |
e9e2c950 RZ |
1292 | |
1293 | static void _shop_key(struct bfd_session *bs, const struct bfd_shop_key *shop); | |
1294 | static void _shop_key2(struct bfd_session *bs, const struct bfd_shop_key *shop); | |
1295 | static void _mhop_key(struct bfd_session *bs, const struct bfd_mhop_key *mhop); | |
e9e2c950 | 1296 | |
e3b78da8 | 1297 | static void _bfd_free(struct hash_bucket *hb, |
e9e2c950 | 1298 | void *arg __attribute__((__unused__))); |
e9e2c950 RZ |
1299 | |
1300 | /* BFD hash for our discriminator. */ | |
1301 | static unsigned int bfd_id_hash_do(void *p) | |
1302 | { | |
1303 | struct bfd_session *bs = p; | |
1304 | ||
1305 | return jhash_1word(bs->discrs.my_discr, 0); | |
1306 | } | |
1307 | ||
74df8d6d | 1308 | static bool bfd_id_hash_cmp(const void *n1, const void *n2) |
e9e2c950 RZ |
1309 | { |
1310 | const struct bfd_session *bs1 = n1, *bs2 = n2; | |
1311 | ||
1312 | return bs1->discrs.my_discr == bs2->discrs.my_discr; | |
1313 | } | |
1314 | ||
1315 | /* BFD hash for single hop. */ | |
1316 | static unsigned int bfd_shop_hash_do(void *p) | |
1317 | { | |
1318 | struct bfd_session *bs = p; | |
1319 | ||
1320 | return jhash(&bs->shop, sizeof(bs->shop), 0); | |
1321 | } | |
1322 | ||
74df8d6d | 1323 | static bool bfd_shop_hash_cmp(const void *n1, const void *n2) |
e9e2c950 RZ |
1324 | { |
1325 | const struct bfd_session *bs1 = n1, *bs2 = n2; | |
1326 | ||
1327 | return memcmp(&bs1->shop, &bs2->shop, sizeof(bs1->shop)) == 0; | |
1328 | } | |
1329 | ||
1330 | /* BFD hash for multi hop. */ | |
1331 | static unsigned int bfd_mhop_hash_do(void *p) | |
1332 | { | |
1333 | struct bfd_session *bs = p; | |
1334 | ||
1335 | return jhash(&bs->mhop, sizeof(bs->mhop), 0); | |
1336 | } | |
1337 | ||
74df8d6d | 1338 | static bool bfd_mhop_hash_cmp(const void *n1, const void *n2) |
e9e2c950 RZ |
1339 | { |
1340 | const struct bfd_session *bs1 = n1, *bs2 = n2; | |
1341 | ||
1342 | return memcmp(&bs1->mhop, &bs2->mhop, sizeof(bs1->mhop)) == 0; | |
1343 | } | |
1344 | ||
e9e2c950 RZ |
1345 | /* Helper functions */ |
1346 | static void _shop_key(struct bfd_session *bs, const struct bfd_shop_key *shop) | |
1347 | { | |
1348 | bs->shop = *shop; | |
1349 | ||
1350 | /* Remove unused fields. */ | |
1351 | switch (bs->shop.peer.sa_sin.sin_family) { | |
1352 | case AF_INET: | |
1353 | bs->shop.peer.sa_sin.sin_port = 0; | |
1354 | break; | |
1355 | case AF_INET6: | |
1356 | bs->shop.peer.sa_sin6.sin6_port = 0; | |
1357 | break; | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | static void _shop_key2(struct bfd_session *bs, const struct bfd_shop_key *shop) | |
1362 | { | |
1363 | _shop_key(bs, shop); | |
b333abc2 | 1364 | bs->shop.ifindex = IFINDEX_INTERNAL; |
e9e2c950 RZ |
1365 | } |
1366 | ||
1367 | static void _mhop_key(struct bfd_session *bs, const struct bfd_mhop_key *mhop) | |
1368 | { | |
1369 | bs->mhop = *mhop; | |
1370 | ||
1371 | /* Remove unused fields. */ | |
1372 | switch (bs->mhop.peer.sa_sin.sin_family) { | |
1373 | case AF_INET: | |
1374 | bs->mhop.peer.sa_sin.sin_port = 0; | |
1375 | bs->mhop.local.sa_sin.sin_port = 0; | |
1376 | break; | |
1377 | case AF_INET6: | |
1378 | bs->mhop.peer.sa_sin6.sin6_port = 0; | |
1379 | bs->mhop.local.sa_sin6.sin6_port = 0; | |
1380 | break; | |
1381 | } | |
1382 | } | |
1383 | ||
e9e2c950 RZ |
1384 | /* |
1385 | * Hash public interface / exported functions. | |
1386 | */ | |
1387 | ||
1388 | /* Lookup functions. */ | |
1389 | struct bfd_session *bfd_id_lookup(uint32_t id) | |
1390 | { | |
1391 | struct bfd_session bs; | |
1392 | ||
1393 | bs.discrs.my_discr = id; | |
1394 | ||
1395 | return hash_lookup(bfd_id_hash, &bs); | |
1396 | } | |
1397 | ||
1398 | struct bfd_session *bfd_shop_lookup(struct bfd_shop_key shop) | |
1399 | { | |
1400 | struct bfd_session bs, *bsp; | |
1401 | ||
1402 | _shop_key(&bs, &shop); | |
1403 | ||
1404 | bsp = hash_lookup(bfd_shop_hash, &bs); | |
b333abc2 | 1405 | if (bsp == NULL && bs.shop.ifindex != 0) { |
e9e2c950 RZ |
1406 | /* |
1407 | * Since the local interface spec is optional, try | |
1408 | * searching the key without it as well. | |
1409 | */ | |
1410 | _shop_key2(&bs, &shop); | |
1411 | bsp = hash_lookup(bfd_shop_hash, &bs); | |
1412 | } | |
1413 | ||
1414 | return bsp; | |
1415 | } | |
1416 | ||
1417 | struct bfd_session *bfd_mhop_lookup(struct bfd_mhop_key mhop) | |
1418 | { | |
1419 | struct bfd_session bs; | |
1420 | ||
1421 | _mhop_key(&bs, &mhop); | |
1422 | ||
2055ea09 | 1423 | return hash_lookup(bfd_mhop_hash, &bs); |
e9e2c950 RZ |
1424 | } |
1425 | ||
e9e2c950 RZ |
1426 | /* |
1427 | * Delete functions. | |
1428 | * | |
1429 | * Delete functions searches and remove the item from the hash and | |
1430 | * returns a pointer to the removed item data. If the item was not found | |
1431 | * then it returns NULL. | |
1432 | * | |
1433 | * The data stored inside the hash is not free()ed, so you must do it | |
1434 | * manually after getting the pointer back. | |
1435 | */ | |
1436 | struct bfd_session *bfd_id_delete(uint32_t id) | |
1437 | { | |
1438 | struct bfd_session bs; | |
1439 | ||
1440 | bs.discrs.my_discr = id; | |
1441 | ||
1442 | return hash_release(bfd_id_hash, &bs); | |
1443 | } | |
1444 | ||
1445 | struct bfd_session *bfd_shop_delete(struct bfd_shop_key shop) | |
1446 | { | |
1447 | struct bfd_session bs, *bsp; | |
1448 | ||
1449 | _shop_key(&bs, &shop); | |
1450 | bsp = hash_release(bfd_shop_hash, &bs); | |
b333abc2 | 1451 | if (bsp == NULL && shop.ifindex != 0) { |
e9e2c950 RZ |
1452 | /* |
1453 | * Since the local interface spec is optional, try | |
1454 | * searching the key without it as well. | |
1455 | */ | |
1456 | _shop_key2(&bs, &shop); | |
1457 | bsp = hash_release(bfd_shop_hash, &bs); | |
1458 | } | |
1459 | ||
1460 | return bsp; | |
1461 | } | |
1462 | ||
1463 | struct bfd_session *bfd_mhop_delete(struct bfd_mhop_key mhop) | |
1464 | { | |
1465 | struct bfd_session bs; | |
1466 | ||
1467 | _mhop_key(&bs, &mhop); | |
1468 | ||
1469 | return hash_release(bfd_mhop_hash, &bs); | |
1470 | } | |
1471 | ||
e9e2c950 RZ |
1472 | /* Iteration functions. */ |
1473 | void bfd_id_iterate(hash_iter_func hif, void *arg) | |
1474 | { | |
1475 | hash_iterate(bfd_id_hash, hif, arg); | |
1476 | } | |
1477 | ||
1478 | void bfd_shop_iterate(hash_iter_func hif, void *arg) | |
1479 | { | |
1480 | hash_iterate(bfd_shop_hash, hif, arg); | |
1481 | } | |
1482 | ||
1483 | void bfd_mhop_iterate(hash_iter_func hif, void *arg) | |
1484 | { | |
1485 | hash_iterate(bfd_mhop_hash, hif, arg); | |
1486 | } | |
1487 | ||
e9e2c950 RZ |
1488 | /* |
1489 | * Insert functions. | |
1490 | * | |
1491 | * Inserts session into hash and returns `true` on success, otherwise | |
1492 | * `false`. | |
1493 | */ | |
1494 | bool bfd_id_insert(struct bfd_session *bs) | |
1495 | { | |
1496 | return (hash_get(bfd_id_hash, bs, hash_alloc_intern) == bs); | |
1497 | } | |
1498 | ||
1499 | bool bfd_shop_insert(struct bfd_session *bs) | |
1500 | { | |
1501 | return (hash_get(bfd_shop_hash, bs, hash_alloc_intern) == bs); | |
1502 | } | |
1503 | ||
1504 | bool bfd_mhop_insert(struct bfd_session *bs) | |
1505 | { | |
1506 | return (hash_get(bfd_mhop_hash, bs, hash_alloc_intern) == bs); | |
1507 | } | |
1508 | ||
e9e2c950 RZ |
1509 | void bfd_initialize(void) |
1510 | { | |
1511 | bfd_id_hash = hash_create(bfd_id_hash_do, bfd_id_hash_cmp, | |
1512 | "BFD discriminator hash"); | |
1513 | bfd_shop_hash = hash_create(bfd_shop_hash_do, bfd_shop_hash_cmp, | |
1514 | "BFD single hop hash"); | |
1515 | bfd_mhop_hash = hash_create(bfd_mhop_hash_do, bfd_mhop_hash_cmp, | |
1516 | "BFD multihop hop hash"); | |
e9e2c950 RZ |
1517 | } |
1518 | ||
e3b78da8 | 1519 | static void _bfd_free(struct hash_bucket *hb, |
e9e2c950 RZ |
1520 | void *arg __attribute__((__unused__))) |
1521 | { | |
1522 | struct bfd_session *bs = hb->data; | |
1523 | ||
1524 | bfd_session_free(bs); | |
1525 | } | |
1526 | ||
e9e2c950 RZ |
1527 | void bfd_shutdown(void) |
1528 | { | |
1529 | /* | |
1530 | * Close and free all BFD sessions. | |
1531 | * | |
1532 | * _bfd_free() will call bfd_session_free() which will take care | |
1533 | * of removing the session from all hashes, so we just run an | |
1534 | * assert() here to make sure it really happened. | |
1535 | */ | |
1536 | bfd_id_iterate(_bfd_free, NULL); | |
1537 | assert(bfd_shop_hash->count == 0); | |
1538 | assert(bfd_mhop_hash->count == 0); | |
1539 | ||
e9e2c950 RZ |
1540 | /* Now free the hashes themselves. */ |
1541 | hash_free(bfd_id_hash); | |
1542 | hash_free(bfd_shop_hash); | |
1543 | hash_free(bfd_mhop_hash); | |
e9e2c950 | 1544 | } |