1 /*********************************************************************
2 * Copyright 2013 Cumulus Networks, LLC. All rights reserved.
3 * Copyright 2014,2015,2016,2017 Cumulus Networks, Inc. All rights reserved.
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)
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
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
19 * bfd.c: implements the BFD protocol.
23 * Shrijeet Mukherjee [shm@cumulusnetworks.com]
24 * Kanna Rajagopal [kanna@cumulusnetworks.com]
25 * Radhika Mahankali [Radhika@cumulusnetworks.com]
30 #include "lib/jhash.h"
34 DEFINE_MTYPE_STATIC(BFDD
, BFDD_CONFIG
, "long-lived configuration memory")
35 DEFINE_MTYPE_STATIC(BFDD
, BFDD_SESSION_OBSERVER
, "Session observer")
36 DEFINE_MTYPE_STATIC(BFDD
, BFDD_VRF
, "BFD VRF")
41 static uint32_t ptm_bfd_gen_ID(void);
42 static void ptm_bfd_echo_xmt_TO(struct bfd_session
*bfd
);
43 static struct bfd_session
*bfd_find_disc(struct sockaddr_any
*sa
,
45 static int bfd_session_update(struct bfd_session
*bs
, struct bfd_peer_cfg
*bpc
);
46 static const char *get_diag_str(int diag
);
48 static void bs_admin_down_handler(struct bfd_session
*bs
, int nstate
);
49 static void bs_down_handler(struct bfd_session
*bs
, int nstate
);
50 static void bs_init_handler(struct bfd_session
*bs
, int nstate
);
51 static void bs_up_handler(struct bfd_session
*bs
, int nstate
);
53 /* Zeroed array with the size of an IPv6 address. */
54 struct in6_addr zero_addr
;
59 void gen_bfd_key(struct bfd_key
*key
, struct sockaddr_any
*peer
,
60 struct sockaddr_any
*local
, bool mhop
, const char *ifname
,
63 memset(key
, 0, sizeof(*key
));
65 switch (peer
->sa_sin
.sin_family
) {
67 key
->family
= AF_INET
;
68 memcpy(&key
->peer
, &peer
->sa_sin
.sin_addr
,
69 sizeof(peer
->sa_sin
.sin_addr
));
70 memcpy(&key
->local
, &local
->sa_sin
.sin_addr
,
71 sizeof(local
->sa_sin
.sin_addr
));
74 key
->family
= AF_INET6
;
75 memcpy(&key
->peer
, &peer
->sa_sin6
.sin6_addr
,
76 sizeof(peer
->sa_sin6
.sin6_addr
));
77 memcpy(&key
->local
, &local
->sa_sin6
.sin6_addr
,
78 sizeof(local
->sa_sin6
.sin6_addr
));
83 if (ifname
&& ifname
[0])
84 strlcpy(key
->ifname
, ifname
, sizeof(key
->ifname
));
85 if (vrfname
&& vrfname
[0])
86 strlcpy(key
->vrfname
, vrfname
, sizeof(key
->vrfname
));
88 strlcpy(key
->vrfname
, VRF_DEFAULT_NAME
, sizeof(key
->vrfname
));
91 struct bfd_session
*bs_peer_find(struct bfd_peer_cfg
*bpc
)
93 struct bfd_session
*bs
;
94 struct peer_label
*pl
;
97 /* Try to find label first. */
98 if (bpc
->bpc_has_label
) {
99 pl
= pl_find(bpc
->bpc_label
);
106 /* Otherwise fallback to peer/local hash lookup. */
107 gen_bfd_key(&key
, &bpc
->bpc_peer
, &bpc
->bpc_local
, bpc
->bpc_mhop
,
108 bpc
->bpc_localif
, bpc
->bpc_vrfname
);
110 return bfd_key_lookup(key
);
114 * Starts a disabled BFD session.
116 * A session is disabled when the specified interface/VRF doesn't exist
117 * yet. It might happen on FRR boot or with virtual interfaces.
119 int bfd_session_enable(struct bfd_session
*bs
)
121 struct interface
*ifp
= NULL
;
122 struct vrf
*vrf
= NULL
;
126 * If the interface or VRF doesn't exist, then we must register
127 * the session but delay its start.
129 if (bs
->key
.vrfname
[0]) {
130 vrf
= vrf_lookup_by_name(bs
->key
.vrfname
);
133 "session-enable: specified VRF doesn't exists.");
138 if (bs
->key
.ifname
[0]) {
140 ifp
= if_lookup_by_name(bs
->key
.ifname
, vrf
->vrf_id
);
142 ifp
= if_lookup_by_name_all_vrf(bs
->key
.ifname
);
145 "session-enable: specified interface doesn't exists.");
148 if (bs
->key
.ifname
[0] && !vrf
) {
149 vrf
= vrf_lookup_by_id(ifp
->vrf_id
);
152 "session-enable: specified VRF doesn't exists.");
158 /* Assign interface/VRF pointers. */
161 bs
->vrf
= vrf_lookup_by_id(VRF_DEFAULT
);
163 if (bs
->key
.ifname
[0]
164 && BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_MH
) == 0)
167 /* Sanity check: don't leak open sockets. */
168 if (bs
->sock
!= -1) {
169 log_debug("session-enable: previous socket open");
175 * Get socket for transmitting control packets. Note that if we
176 * could use the destination port (3784) for the source
177 * port we wouldn't need a socket per session.
179 if (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_IPV6
) == 0) {
180 psock
= bp_peer_socket(bs
);
184 psock
= bp_peer_socketv6(bs
);
190 * We've got a valid socket, lets start the timers and the
194 bfd_recvtimer_update(bs
);
195 ptm_bfd_start_xmt_timer(bs
, false);
201 * Disabled a running BFD session.
203 * A session is disabled when the specified interface/VRF gets removed
204 * (e.g. virtual interfaces).
206 void bfd_session_disable(struct bfd_session
*bs
)
208 /* Free up socket resources. */
209 if (bs
->sock
!= -1) {
214 /* Disable all timers. */
215 bfd_recvtimer_delete(bs
);
216 bfd_echo_recvtimer_delete(bs
);
217 bfd_xmttimer_delete(bs
);
218 bfd_echo_xmttimer_delete(bs
);
221 static uint32_t ptm_bfd_gen_ID(void)
226 * RFC 5880, Section 6.8.1. recommends that we should generate
227 * random session identification numbers.
230 session_id
= ((random() << 16) & 0xFFFF0000)
231 | (random() & 0x0000FFFF);
232 } while (session_id
== 0 || bfd_id_lookup(session_id
) != NULL
);
237 void ptm_bfd_start_xmt_timer(struct bfd_session
*bfd
, bool is_echo
)
239 uint64_t jitter
, xmt_TO
;
242 xmt_TO
= is_echo
? bfd
->echo_xmt_TO
: bfd
->xmt_TO
;
245 * From section 6.5.2: trasmit interval should be randomly jittered
247 * 75% and 100% of nominal value, unless detect_mult is 1, then should
249 * between 75% and 90%.
251 maxpercent
= (bfd
->detect_mult
== 1) ? 16 : 26;
252 jitter
= (xmt_TO
* (75 + (random() % maxpercent
))) / 100;
253 /* XXX remove that division above */
256 bfd_echo_xmttimer_update(bfd
, jitter
);
258 bfd_xmttimer_update(bfd
, jitter
);
261 static void ptm_bfd_echo_xmt_TO(struct bfd_session
*bfd
)
263 /* Send the scheduled echo packet */
264 ptm_bfd_echo_snd(bfd
);
266 /* Restart the timer for next time */
267 ptm_bfd_start_xmt_timer(bfd
, true);
270 void ptm_bfd_xmt_TO(struct bfd_session
*bfd
, int fbit
)
272 /* Send the scheduled control packet */
273 ptm_bfd_snd(bfd
, fbit
);
275 /* Restart the timer for next time */
276 ptm_bfd_start_xmt_timer(bfd
, false);
279 void ptm_bfd_echo_stop(struct bfd_session
*bfd
)
281 bfd
->echo_xmt_TO
= 0;
282 bfd
->echo_detect_TO
= 0;
283 BFD_UNSET_FLAG(bfd
->flags
, BFD_SESS_FLAG_ECHO_ACTIVE
);
285 bfd_echo_xmttimer_delete(bfd
);
286 bfd_echo_recvtimer_delete(bfd
);
289 void ptm_bfd_echo_start(struct bfd_session
*bfd
)
291 bfd
->echo_detect_TO
= (bfd
->remote_detect_mult
* bfd
->echo_xmt_TO
);
292 if (bfd
->echo_detect_TO
> 0)
293 ptm_bfd_echo_xmt_TO(bfd
);
296 void ptm_bfd_sess_up(struct bfd_session
*bfd
)
298 int old_state
= bfd
->ses_state
;
301 bfd
->ses_state
= PTM_BFD_UP
;
302 monotime(&bfd
->uptime
);
304 /* Connection is up, lets negotiate timers. */
305 bfd_set_polling(bfd
);
307 /* Start sending control packets with poll bit immediately. */
312 if (old_state
!= bfd
->ses_state
) {
313 bfd
->stats
.session_up
++;
314 log_info("state-change: [%s] %s -> %s", bs_to_string(bfd
),
315 state_list
[old_state
].str
,
316 state_list
[bfd
->ses_state
].str
);
320 void ptm_bfd_sess_dn(struct bfd_session
*bfd
, uint8_t diag
)
322 int old_state
= bfd
->ses_state
;
324 bfd
->local_diag
= diag
;
325 bfd
->discrs
.remote_discr
= 0;
326 bfd
->ses_state
= PTM_BFD_DOWN
;
328 bfd
->demand_mode
= 0;
329 monotime(&bfd
->downtime
);
333 /* Slow down the control packets, the connection is down. */
334 bs_set_slow_timers(bfd
);
336 /* only signal clients when going from up->down state */
337 if (old_state
== PTM_BFD_UP
)
340 /* Stop echo packet transmission if they are active */
341 if (BFD_CHECK_FLAG(bfd
->flags
, BFD_SESS_FLAG_ECHO_ACTIVE
))
342 ptm_bfd_echo_stop(bfd
);
344 if (old_state
!= bfd
->ses_state
) {
345 bfd
->stats
.session_down
++;
346 log_info("state-change: [%s] %s -> %s reason:%s",
347 bs_to_string(bfd
), state_list
[old_state
].str
,
348 state_list
[bfd
->ses_state
].str
,
349 get_diag_str(bfd
->local_diag
));
353 static struct bfd_session
*bfd_find_disc(struct sockaddr_any
*sa
,
356 struct bfd_session
*bs
;
358 bs
= bfd_id_lookup(ldisc
);
362 switch (bs
->key
.family
) {
364 if (memcmp(&sa
->sa_sin
.sin_addr
, &bs
->key
.peer
,
365 sizeof(sa
->sa_sin
.sin_addr
)))
369 if (memcmp(&sa
->sa_sin6
.sin6_addr
, &bs
->key
.peer
,
370 sizeof(sa
->sa_sin6
.sin6_addr
)))
378 struct bfd_session
*ptm_bfd_sess_find(struct bfd_pkt
*cp
,
379 struct sockaddr_any
*peer
,
380 struct sockaddr_any
*local
,
381 ifindex_t ifindex
, vrf_id_t vrfid
,
384 struct interface
*ifp
;
388 /* Find our session using the ID signaled by the remote end. */
389 if (cp
->discrs
.remote_discr
)
390 return bfd_find_disc(peer
, ntohl(cp
->discrs
.remote_discr
));
392 /* Search for session without using discriminator. */
393 ifp
= if_lookup_by_index(ifindex
, vrfid
);
395 vrf
= vrf_lookup_by_id(vrfid
);
397 gen_bfd_key(&key
, peer
, local
, is_mhop
, ifp
? ifp
->name
: NULL
,
398 vrf
? vrf
->name
: VRF_DEFAULT_NAME
);
400 /* XXX maybe remoteDiscr should be checked for remoteHeard cases. */
401 return bfd_key_lookup(key
);
404 int bfd_xmt_cb(struct thread
*t
)
406 struct bfd_session
*bs
= THREAD_ARG(t
);
408 ptm_bfd_xmt_TO(bs
, 0);
413 int bfd_echo_xmt_cb(struct thread
*t
)
415 struct bfd_session
*bs
= THREAD_ARG(t
);
417 if (bs
->echo_xmt_TO
> 0)
418 ptm_bfd_echo_xmt_TO(bs
);
423 /* Was ptm_bfd_detect_TO() */
424 int bfd_recvtimer_cb(struct thread
*t
)
426 struct bfd_session
*bs
= THREAD_ARG(t
);
428 switch (bs
->ses_state
) {
431 ptm_bfd_sess_dn(bs
, BD_CONTROL_EXPIRED
);
432 bfd_recvtimer_update(bs
);
436 /* Second detect time expiration, zero remote discr (section
439 bs
->discrs
.remote_discr
= 0;
446 /* Was ptm_bfd_echo_detect_TO() */
447 int bfd_echo_recvtimer_cb(struct thread
*t
)
449 struct bfd_session
*bs
= THREAD_ARG(t
);
451 switch (bs
->ses_state
) {
454 ptm_bfd_sess_dn(bs
, BD_ECHO_FAILED
);
461 struct bfd_session
*bfd_session_new(void)
463 struct bfd_session
*bs
;
465 bs
= XCALLOC(MTYPE_BFDD_CONFIG
, sizeof(*bs
));
467 bs
->timers
.desired_min_tx
= BFD_DEFDESIREDMINTX
;
468 bs
->timers
.required_min_rx
= BFD_DEFREQUIREDMINRX
;
469 bs
->timers
.required_min_echo
= BFD_DEF_REQ_MIN_ECHO
;
470 bs
->detect_mult
= BFD_DEFDETECTMULT
;
471 bs
->mh_ttl
= BFD_DEF_MHOP_TTL
;
472 bs
->ses_state
= PTM_BFD_DOWN
;
474 /* Initiate connection with slow timers. */
475 bs_set_slow_timers(bs
);
477 /* Initiate remote settings as well. */
478 bs
->remote_timers
= bs
->cur_timers
;
479 bs
->remote_detect_mult
= BFD_DEFDETECTMULT
;
482 monotime(&bs
->uptime
);
483 bs
->downtime
= bs
->uptime
;
488 int bfd_session_update_label(struct bfd_session
*bs
, const char *nlabel
)
490 /* New label treatment:
491 * - Check if the label is taken;
492 * - Try to allocate the memory for it and register;
494 if (bs
->pl
== NULL
) {
495 if (pl_find(nlabel
) != NULL
) {
496 /* Someone is already using it. */
500 if (pl_new(nlabel
, bs
) == NULL
)
507 * Test label change consistency:
508 * - Do nothing if it's the same label;
509 * - Check if the future label is already taken;
512 if (strcmp(nlabel
, bs
->pl
->pl_label
) == 0)
514 if (pl_find(nlabel
) != NULL
)
517 strlcpy(bs
->pl
->pl_label
, nlabel
, sizeof(bs
->pl
->pl_label
));
521 static void _bfd_session_update(struct bfd_session
*bs
,
522 struct bfd_peer_cfg
*bpc
)
525 /* Check if echo mode is already active. */
526 if (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_ECHO
))
529 BFD_SET_FLAG(bs
->flags
, BFD_SESS_FLAG_ECHO
);
531 /* Activate/update echo receive timeout timer. */
532 bs_echo_timer_handler(bs
);
534 /* Check if echo mode is already disabled. */
535 if (!BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_ECHO
))
538 BFD_UNSET_FLAG(bs
->flags
, BFD_SESS_FLAG_ECHO
);
539 ptm_bfd_echo_stop(bs
);
543 if (bpc
->bpc_has_txinterval
)
544 bs
->timers
.desired_min_tx
= bpc
->bpc_txinterval
* 1000;
546 if (bpc
->bpc_has_recvinterval
)
547 bs
->timers
.required_min_rx
= bpc
->bpc_recvinterval
* 1000;
549 if (bpc
->bpc_has_detectmultiplier
)
550 bs
->detect_mult
= bpc
->bpc_detectmultiplier
;
552 if (bpc
->bpc_has_echointerval
)
553 bs
->timers
.required_min_echo
= bpc
->bpc_echointerval
* 1000;
555 if (bpc
->bpc_has_label
)
556 bfd_session_update_label(bs
, bpc
->bpc_label
);
558 if (bpc
->bpc_shutdown
) {
559 /* Check if already shutdown. */
560 if (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_SHUTDOWN
))
563 BFD_SET_FLAG(bs
->flags
, BFD_SESS_FLAG_SHUTDOWN
);
565 /* Disable all events. */
566 bfd_recvtimer_delete(bs
);
567 bfd_echo_recvtimer_delete(bs
);
568 bfd_xmttimer_delete(bs
);
569 bfd_echo_xmttimer_delete(bs
);
571 /* Change and notify state change. */
572 bs
->ses_state
= PTM_BFD_ADM_DOWN
;
575 /* Don't try to send packets with a disabled session. */
579 /* Check if already working. */
580 if (!BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_SHUTDOWN
))
583 BFD_UNSET_FLAG(bs
->flags
, BFD_SESS_FLAG_SHUTDOWN
);
585 /* Change and notify state change. */
586 bs
->ses_state
= PTM_BFD_DOWN
;
589 /* Enable all timers. */
590 bfd_recvtimer_update(bs
);
591 bfd_xmttimer_update(bs
, bs
->xmt_TO
);
594 if (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_CBIT
))
597 BFD_SET_FLAG(bs
->flags
, BFD_SESS_FLAG_CBIT
);
599 if (!BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_CBIT
))
602 BFD_UNSET_FLAG(bs
->flags
, BFD_SESS_FLAG_CBIT
);
606 static int bfd_session_update(struct bfd_session
*bs
, struct bfd_peer_cfg
*bpc
)
608 /* User didn't want to update, return failure. */
609 if (bpc
->bpc_createonly
)
612 _bfd_session_update(bs
, bpc
);
614 control_notify_config(BCM_NOTIFY_CONFIG_UPDATE
, bs
);
619 void bfd_session_free(struct bfd_session
*bs
)
621 struct bfd_session_observer
*bso
;
623 bfd_session_disable(bs
);
625 bfd_key_delete(bs
->key
);
626 bfd_id_delete(bs
->discrs
.my_discr
);
628 /* Remove observer if any. */
629 TAILQ_FOREACH(bso
, &bglobal
.bg_obslist
, bso_entry
) {
630 if (bso
->bso_bs
!= bs
)
636 bs_observer_del(bso
);
640 XFREE(MTYPE_BFDD_CONFIG
, bs
);
643 struct bfd_session
*ptm_bfd_sess_new(struct bfd_peer_cfg
*bpc
)
645 struct bfd_session
*bfd
, *l_bfd
;
647 /* check to see if this needs a new session */
648 l_bfd
= bs_peer_find(bpc
);
650 /* Requesting a duplicated peer means update configuration. */
651 if (bfd_session_update(l_bfd
, bpc
) == 0)
657 /* Get BFD session storage with its defaults. */
658 bfd
= bfd_session_new();
660 log_error("session-new: allocation failed");
665 * Store interface/VRF name in case we need to delay session
666 * start. See `bfd_session_enable` for more information.
668 if (bpc
->bpc_has_localif
)
669 strlcpy(bfd
->key
.ifname
, bpc
->bpc_localif
,
670 sizeof(bfd
->key
.ifname
));
672 if (bpc
->bpc_has_vrfname
)
673 strlcpy(bfd
->key
.vrfname
, bpc
->bpc_vrfname
,
674 sizeof(bfd
->key
.vrfname
));
676 strlcpy(bfd
->key
.vrfname
, VRF_DEFAULT_NAME
,
677 sizeof(bfd
->key
.vrfname
));
679 /* Copy remaining data. */
680 if (bpc
->bpc_ipv4
== false)
681 BFD_SET_FLAG(bfd
->flags
, BFD_SESS_FLAG_IPV6
);
683 bfd
->key
.family
= (bpc
->bpc_ipv4
) ? AF_INET
: AF_INET6
;
684 switch (bfd
->key
.family
) {
686 memcpy(&bfd
->key
.peer
, &bpc
->bpc_peer
.sa_sin
.sin_addr
,
687 sizeof(bpc
->bpc_peer
.sa_sin
.sin_addr
));
688 memcpy(&bfd
->key
.local
, &bpc
->bpc_local
.sa_sin
.sin_addr
,
689 sizeof(bpc
->bpc_local
.sa_sin
.sin_addr
));
693 memcpy(&bfd
->key
.peer
, &bpc
->bpc_peer
.sa_sin6
.sin6_addr
,
694 sizeof(bpc
->bpc_peer
.sa_sin6
.sin6_addr
));
695 memcpy(&bfd
->key
.local
, &bpc
->bpc_local
.sa_sin6
.sin6_addr
,
696 sizeof(bpc
->bpc_local
.sa_sin6
.sin6_addr
));
705 BFD_SET_FLAG(bfd
->flags
, BFD_SESS_FLAG_MH
);
707 bfd
->key
.mhop
= bpc
->bpc_mhop
;
709 if (bs_registrate(bfd
) == NULL
)
712 /* Apply other configurations. */
713 _bfd_session_update(bfd
, bpc
);
718 struct bfd_session
*bs_registrate(struct bfd_session
*bfd
)
720 /* Registrate session into data structures. */
722 bfd
->discrs
.my_discr
= ptm_bfd_gen_ID();
725 /* Try to enable session and schedule for packet receive/send. */
726 if (bfd_session_enable(bfd
) == -1) {
727 /* Unrecoverable failure, remove the session/peer. */
728 bfd_session_free(bfd
);
732 /* Add observer if we have moving parts. */
733 if (bfd
->key
.ifname
[0] || bfd
->key
.vrfname
[0] || bfd
->sock
== -1)
734 bs_observer_add(bfd
);
736 log_info("session-new: %s", bs_to_string(bfd
));
738 control_notify_config(BCM_NOTIFY_CONFIG_ADD
, bfd
);
743 int ptm_bfd_sess_del(struct bfd_peer_cfg
*bpc
)
745 struct bfd_session
*bs
;
747 /* Find session and call free(). */
748 bs
= bs_peer_find(bpc
);
752 /* This pointer is being referenced, don't let it be deleted. */
753 if (bs
->refcount
> 0) {
754 log_error("session-delete: refcount failure: %" PRIu64
760 log_info("session-delete: %s", bs_to_string(bs
));
762 control_notify_config(BCM_NOTIFY_CONFIG_DELETE
, bs
);
764 bfd_session_free(bs
);
769 void bfd_set_polling(struct bfd_session
*bs
)
772 * Start polling procedure: the only timers that require polling
773 * to change value without losing connection are:
775 * - Desired minimum transmission interval;
776 * - Required minimum receive interval;
778 * RFC 5880, Section 6.8.3.
784 * bs_<state>_handler() functions implement the BFD state machine
785 * transition mechanism. `<state>` is the current session state and
786 * the parameter `nstate` is the peer new state.
788 static void bs_admin_down_handler(struct bfd_session
*bs
789 __attribute__((__unused__
)),
790 int nstate
__attribute__((__unused__
)))
793 * We are administratively down, there is no state machine
798 static void bs_down_handler(struct bfd_session
*bs
, int nstate
)
801 case PTM_BFD_ADM_DOWN
:
803 * Remote peer doesn't want to talk, so lets keep the
807 /* Peer can't be up yet, wait it go to 'init' or 'down'. */
812 * Remote peer agreed that the path is down, lets try to
815 bs
->ses_state
= PTM_BFD_INIT
;
820 * Remote peer told us his path is up, lets turn
821 * activate the session.
827 log_debug("state-change: unhandled neighbor state: %d", nstate
);
832 static void bs_init_handler(struct bfd_session
*bs
, int nstate
)
835 case PTM_BFD_ADM_DOWN
:
837 * Remote peer doesn't want to talk, so lets make the
840 bs
->ses_state
= PTM_BFD_DOWN
;
844 /* Remote peer hasn't moved to first stage yet. */
849 /* We agreed on the settings and the path is up. */
854 log_debug("state-change: unhandled neighbor state: %d", nstate
);
859 static void bs_up_handler(struct bfd_session
*bs
, int nstate
)
862 case PTM_BFD_ADM_DOWN
:
864 /* Peer lost or asked to shutdown connection. */
865 ptm_bfd_sess_dn(bs
, BD_NEIGHBOR_DOWN
);
870 /* Path is up and working. */
874 log_debug("state-change: unhandled neighbor state: %d", nstate
);
879 void bs_state_handler(struct bfd_session
*bs
, int nstate
)
881 switch (bs
->ses_state
) {
882 case PTM_BFD_ADM_DOWN
:
883 bs_admin_down_handler(bs
, nstate
);
886 bs_down_handler(bs
, nstate
);
889 bs_init_handler(bs
, nstate
);
892 bs_up_handler(bs
, nstate
);
896 log_debug("state-change: [%s] is in invalid state: %d",
897 bs_to_string(bs
), nstate
);
903 * Handles echo timer manipulation after updating timer.
905 void bs_echo_timer_handler(struct bfd_session
*bs
)
910 * Before doing any echo handling, check if it is possible to
913 * - Check for `echo-mode` configuration.
914 * - Check that we are not using multi hop (RFC 5883,
916 * - Check that we are already at the up state.
918 if (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_ECHO
) == 0
919 || BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_MH
)
920 || bs
->ses_state
!= PTM_BFD_UP
)
923 /* Remote peer asked to stop echo. */
924 if (bs
->remote_timers
.required_min_echo
== 0) {
925 if (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_ECHO_ACTIVE
))
926 ptm_bfd_echo_stop(bs
);
932 * Calculate the echo transmission timer: we must not send
933 * echo packets faster than the minimum required time
934 * announced by the remote system.
936 * RFC 5880, Section 6.8.9.
938 old_timer
= bs
->echo_xmt_TO
;
939 if (bs
->remote_timers
.required_min_echo
> bs
->timers
.required_min_echo
)
940 bs
->echo_xmt_TO
= bs
->remote_timers
.required_min_echo
;
942 bs
->echo_xmt_TO
= bs
->timers
.required_min_echo
;
944 if (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_ECHO_ACTIVE
) == 0
945 || old_timer
!= bs
->echo_xmt_TO
)
946 ptm_bfd_echo_start(bs
);
950 * RFC 5880 Section 6.5.
952 * When a BFD control packet with the final bit is received, we must
953 * update the session parameters.
955 void bs_final_handler(struct bfd_session
*bs
)
957 /* Start using our new timers. */
958 bs
->cur_timers
.desired_min_tx
= bs
->timers
.desired_min_tx
;
959 bs
->cur_timers
.required_min_rx
= bs
->timers
.required_min_rx
;
962 * TODO: demand mode. See RFC 5880 Section 6.1.
964 * When using demand mode we must disable the detection timer
965 * for lost control packets.
967 if (bs
->demand_mode
) {
968 /* Notify watchers about changed timers. */
969 control_notify_config(BCM_NOTIFY_CONFIG_UPDATE
, bs
);
974 * Calculate detection time based on new timers.
976 * Transmission calculation:
977 * We must respect the RequiredMinRxInterval from the remote
978 * system: if our desired transmission timer is more than the
979 * minimum receive rate, then we must lower it to at least the
980 * minimum receive interval.
982 * RFC 5880, Section 6.8.3.
984 if (bs
->timers
.desired_min_tx
> bs
->remote_timers
.required_min_rx
)
985 bs
->xmt_TO
= bs
->remote_timers
.required_min_rx
;
987 bs
->xmt_TO
= bs
->timers
.desired_min_tx
;
989 /* Apply new transmission timer immediately. */
990 ptm_bfd_start_xmt_timer(bs
, false);
993 * Detection timeout calculation:
994 * The minimum detection timeout is the remote detection
995 * multipler (number of packets to be missed) times the agreed
996 * transmission interval.
998 * RFC 5880, Section 6.8.4.
1000 * TODO: support sending/counting more packets inside detection
1003 if (bs
->remote_timers
.required_min_rx
> bs
->timers
.desired_min_tx
)
1004 bs
->detect_TO
= bs
->remote_detect_mult
1005 * bs
->remote_timers
.required_min_rx
;
1007 bs
->detect_TO
= bs
->remote_detect_mult
1008 * bs
->timers
.desired_min_tx
;
1010 /* Apply new receive timer immediately. */
1011 bfd_recvtimer_update(bs
);
1013 /* Notify watchers about changed timers. */
1014 control_notify_config(BCM_NOTIFY_CONFIG_UPDATE
, bs
);
1017 void bs_set_slow_timers(struct bfd_session
*bs
)
1020 * BFD connection must use slow timers before going up or after
1021 * losing connectivity to avoid wasting bandwidth.
1023 * RFC 5880, Section 6.8.3.
1025 bs
->cur_timers
.desired_min_tx
= BFD_DEF_SLOWTX
;
1026 bs
->cur_timers
.required_min_rx
= BFD_DEF_SLOWTX
;
1027 bs
->cur_timers
.required_min_echo
= 0;
1029 /* Set the appropriated timeouts for slow connection. */
1030 bs
->detect_TO
= (BFD_DEFDETECTMULT
* BFD_DEF_SLOWTX
);
1031 bs
->xmt_TO
= BFD_DEF_SLOWTX
;
1037 static const char *get_diag_str(int diag
)
1039 for (int i
= 0; diag_list
[i
].str
; i
++) {
1040 if (diag_list
[i
].type
== diag
)
1041 return diag_list
[i
].str
;
1046 const char *satostr(struct sockaddr_any
*sa
)
1048 #define INETSTR_BUFCOUNT 8
1049 static char buf
[INETSTR_BUFCOUNT
][INET6_ADDRSTRLEN
];
1051 struct sockaddr_in
*sin
= &sa
->sa_sin
;
1052 struct sockaddr_in6
*sin6
= &sa
->sa_sin6
;
1054 bufidx
+= (bufidx
+ 1) % INETSTR_BUFCOUNT
;
1057 switch (sin
->sin_family
) {
1059 inet_ntop(AF_INET
, &sin
->sin_addr
, buf
[bufidx
],
1060 sizeof(buf
[bufidx
]));
1063 inet_ntop(AF_INET6
, &sin6
->sin6_addr
, buf
[bufidx
],
1064 sizeof(buf
[bufidx
]));
1068 strlcpy(buf
[bufidx
], "unknown", sizeof(buf
[bufidx
]));
1075 const char *diag2str(uint8_t diag
)
1081 return "control detection time expired";
1083 return "echo function failed";
1085 return "neighbor signaled session down";
1087 return "forwarding plane reset";
1091 return "concatenated path down";
1093 return "administratively down";
1095 return "reverse concatenated path down";
1101 int strtosa(const char *addr
, struct sockaddr_any
*sa
)
1103 memset(sa
, 0, sizeof(*sa
));
1105 if (inet_pton(AF_INET
, addr
, &sa
->sa_sin
.sin_addr
) == 1) {
1106 sa
->sa_sin
.sin_family
= AF_INET
;
1107 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1108 sa
->sa_sin
.sin_len
= sizeof(sa
->sa_sin
);
1109 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
1113 if (inet_pton(AF_INET6
, addr
, &sa
->sa_sin6
.sin6_addr
) == 1) {
1114 sa
->sa_sin6
.sin6_family
= AF_INET6
;
1115 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1116 sa
->sa_sin6
.sin6_len
= sizeof(sa
->sa_sin6
);
1117 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
1124 void integer2timestr(uint64_t time
, char *buf
, size_t buflen
)
1126 unsigned int year
, month
, day
, hour
, minute
, second
;
1129 #define MINUTES (60)
1130 #define HOURS (60 * MINUTES)
1131 #define DAYS (24 * HOURS)
1132 #define MONTHS (30 * DAYS)
1133 #define YEARS (12 * MONTHS)
1134 if (time
>= YEARS
) {
1135 year
= time
/ YEARS
;
1136 time
-= year
* YEARS
;
1138 rv
= snprintf(buf
, buflen
, "%u year(s), ", year
);
1142 if (time
>= MONTHS
) {
1143 month
= time
/ MONTHS
;
1144 time
-= month
* MONTHS
;
1146 rv
= snprintf(buf
, buflen
, "%u month(s), ", month
);
1154 rv
= snprintf(buf
, buflen
, "%u day(s), ", day
);
1158 if (time
>= HOURS
) {
1159 hour
= time
/ HOURS
;
1160 time
-= hour
* HOURS
;
1162 rv
= snprintf(buf
, buflen
, "%u hour(s), ", hour
);
1166 if (time
>= MINUTES
) {
1167 minute
= time
/ MINUTES
;
1168 time
-= minute
* MINUTES
;
1170 rv
= snprintf(buf
, buflen
, "%u minute(s), ", minute
);
1174 second
= time
% MINUTES
;
1175 snprintf(buf
, buflen
, "%u second(s)", second
);
1178 const char *bs_to_string(const struct bfd_session
*bs
)
1180 static char buf
[256];
1181 char addr_buf
[INET6_ADDRSTRLEN
];
1183 bool is_mhop
= BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_MH
);
1185 pos
= snprintf(buf
, sizeof(buf
), "mhop:%s", is_mhop
? "yes" : "no");
1186 pos
+= snprintf(buf
+ pos
, sizeof(buf
) - pos
, " peer:%s",
1187 inet_ntop(bs
->key
.family
, &bs
->key
.peer
, addr_buf
,
1189 pos
+= snprintf(buf
+ pos
, sizeof(buf
) - pos
, " local:%s",
1190 inet_ntop(bs
->key
.family
, &bs
->key
.local
, addr_buf
,
1192 if (bs
->key
.vrfname
[0])
1193 pos
+= snprintf(buf
+ pos
, sizeof(buf
) - pos
, " vrf:%s",
1195 if (bs
->key
.ifname
[0])
1196 pos
+= snprintf(buf
+ pos
, sizeof(buf
) - pos
, " ifname:%s",
1204 int bs_observer_add(struct bfd_session
*bs
)
1206 struct bfd_session_observer
*bso
;
1208 bso
= XCALLOC(MTYPE_BFDD_SESSION_OBSERVER
, sizeof(*bso
));
1209 bso
->bso_isaddress
= false;
1211 bso
->bso_isinterface
= !BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_MH
);
1212 if (bso
->bso_isinterface
)
1213 strlcpy(bso
->bso_entryname
, bs
->key
.ifname
,
1214 sizeof(bso
->bso_entryname
));
1215 /* Handle socket binding failures caused by missing local addresses. */
1216 if (bs
->sock
== -1) {
1217 bso
->bso_isaddress
= true;
1218 bso
->bso_addr
.family
= bs
->key
.family
;
1219 memcpy(&bso
->bso_addr
.u
.prefix
, &bs
->key
.local
,
1220 sizeof(bs
->key
.local
));
1223 TAILQ_INSERT_TAIL(&bglobal
.bg_obslist
, bso
, bso_entry
);
1228 void bs_observer_del(struct bfd_session_observer
*bso
)
1230 TAILQ_REMOVE(&bglobal
.bg_obslist
, bso
, bso_entry
);
1231 XFREE(MTYPE_BFDD_SESSION_OBSERVER
, bso
);
1234 void bs_to_bpc(struct bfd_session
*bs
, struct bfd_peer_cfg
*bpc
)
1236 memset(bpc
, 0, sizeof(*bpc
));
1238 bpc
->bpc_ipv4
= (bs
->key
.family
== AF_INET
);
1239 bpc
->bpc_mhop
= bs
->key
.mhop
;
1241 switch (bs
->key
.family
) {
1243 bpc
->bpc_peer
.sa_sin
.sin_family
= AF_INET
;
1244 memcpy(&bpc
->bpc_peer
.sa_sin
.sin_addr
, &bs
->key
.peer
,
1245 sizeof(bpc
->bpc_peer
.sa_sin
.sin_addr
));
1247 if (memcmp(&bs
->key
.local
, &zero_addr
, sizeof(bs
->key
.local
))) {
1248 bpc
->bpc_local
.sa_sin
.sin_family
= AF_INET6
;
1249 memcpy(&bpc
->bpc_local
.sa_sin
.sin_addr
, &bs
->key
.local
,
1250 sizeof(bpc
->bpc_local
.sa_sin
.sin_addr
));
1255 bpc
->bpc_peer
.sa_sin
.sin_family
= AF_INET6
;
1256 memcpy(&bpc
->bpc_peer
.sa_sin6
.sin6_addr
, &bs
->key
.peer
,
1257 sizeof(bpc
->bpc_peer
.sa_sin6
.sin6_addr
));
1259 bpc
->bpc_local
.sa_sin6
.sin6_family
= AF_INET6
;
1260 memcpy(&bpc
->bpc_local
.sa_sin6
.sin6_addr
, &bs
->key
.local
,
1261 sizeof(bpc
->bpc_local
.sa_sin6
.sin6_addr
));
1265 if (bs
->key
.ifname
[0]) {
1266 bpc
->bpc_has_localif
= true;
1267 strlcpy(bpc
->bpc_localif
, bs
->key
.ifname
,
1268 sizeof(bpc
->bpc_localif
));
1271 if (bs
->key
.vrfname
[0]) {
1272 bpc
->bpc_has_vrfname
= true;
1273 strlcpy(bpc
->bpc_vrfname
, bs
->key
.vrfname
,
1274 sizeof(bpc
->bpc_vrfname
));
1280 * BFD hash data structures to find sessions.
1282 static struct hash
*bfd_id_hash
;
1283 static struct hash
*bfd_key_hash
;
1285 static unsigned int bfd_id_hash_do(const void *p
);
1286 static unsigned int bfd_key_hash_do(const void *p
);
1288 static void _bfd_free(struct hash_bucket
*hb
,
1289 void *arg
__attribute__((__unused__
)));
1291 /* BFD hash for our discriminator. */
1292 static unsigned int bfd_id_hash_do(const void *p
)
1294 const struct bfd_session
*bs
= p
;
1296 return jhash_1word(bs
->discrs
.my_discr
, 0);
1299 static bool bfd_id_hash_cmp(const void *n1
, const void *n2
)
1301 const struct bfd_session
*bs1
= n1
, *bs2
= n2
;
1303 return bs1
->discrs
.my_discr
== bs2
->discrs
.my_discr
;
1306 /* BFD hash for single hop. */
1307 static unsigned int bfd_key_hash_do(const void *p
)
1309 const struct bfd_session
*bs
= p
;
1311 return jhash(&bs
->key
, sizeof(bs
->key
), 0);
1314 static bool bfd_key_hash_cmp(const void *n1
, const void *n2
)
1316 const struct bfd_session
*bs1
= n1
, *bs2
= n2
;
1318 return memcmp(&bs1
->key
, &bs2
->key
, sizeof(bs1
->key
)) == 0;
1323 * Hash public interface / exported functions.
1326 /* Lookup functions. */
1327 struct bfd_session
*bfd_id_lookup(uint32_t id
)
1329 struct bfd_session bs
;
1331 bs
.discrs
.my_discr
= id
;
1333 return hash_lookup(bfd_id_hash
, &bs
);
1336 struct bfd_key_walk_partial_lookup
{
1337 struct bfd_session
*given
;
1338 struct bfd_session
*result
;
1341 /* ignore some parameters */
1342 static int bfd_key_lookup_ignore_partial_walker(struct hash_bucket
*b
,
1345 struct bfd_key_walk_partial_lookup
*ctx
=
1346 (struct bfd_key_walk_partial_lookup
*)data
;
1347 struct bfd_session
*given
= ctx
->given
;
1348 struct bfd_session
*parsed
= b
->data
;
1350 if (given
->key
.family
!= parsed
->key
.family
)
1351 return HASHWALK_CONTINUE
;
1352 if (given
->key
.mhop
!= parsed
->key
.mhop
)
1353 return HASHWALK_CONTINUE
;
1354 if (memcmp(&given
->key
.peer
, &parsed
->key
.peer
,
1355 sizeof(struct in6_addr
)))
1356 return HASHWALK_CONTINUE
;
1357 if (memcmp(given
->key
.vrfname
, parsed
->key
.vrfname
, MAXNAMELEN
))
1358 return HASHWALK_CONTINUE
;
1359 ctx
->result
= parsed
;
1360 /* ignore localaddr or interface */
1361 return HASHWALK_ABORT
;
1364 struct bfd_session
*bfd_key_lookup(struct bfd_key key
)
1366 struct bfd_session bs
, *bsp
;
1367 struct bfd_key_walk_partial_lookup ctx
;
1368 char peer_buf
[INET6_ADDRSTRLEN
];
1371 bsp
= hash_lookup(bfd_key_hash
, &bs
);
1375 inet_ntop(bs
.key
.family
, &bs
.key
.peer
, peer_buf
,
1377 /* Handle cases where local-address is optional. */
1378 if (bs
.key
.family
== AF_INET
) {
1379 memset(&bs
.key
.local
, 0, sizeof(bs
.key
.local
));
1380 bsp
= hash_lookup(bfd_key_hash
, &bs
);
1382 char addr_buf
[INET6_ADDRSTRLEN
];
1384 inet_ntop(bs
.key
.family
, &key
.local
, addr_buf
,
1386 log_debug(" peer %s found, but loc-addr %s ignored",
1387 peer_buf
, addr_buf
);
1393 /* Handle cases where ifname is optional. */
1394 if (bs
.key
.ifname
[0]) {
1395 memset(bs
.key
.ifname
, 0, sizeof(bs
.key
.ifname
));
1396 bsp
= hash_lookup(bfd_key_hash
, &bs
);
1398 log_debug(" peer %s found, but ifp %s ignored",
1399 peer_buf
, key
.ifname
);
1404 /* Handle cases where local-address and ifname are optional. */
1405 if (bs
.key
.family
== AF_INET
) {
1406 memset(&bs
.key
.local
, 0, sizeof(bs
.key
.local
));
1407 bsp
= hash_lookup(bfd_key_hash
, &bs
);
1409 char addr_buf
[INET6_ADDRSTRLEN
];
1411 inet_ntop(bs
.key
.family
, &bs
.key
.local
, addr_buf
,
1413 log_debug(" peer %s found, but ifp %s"
1414 " and loc-addr %s ignored",
1415 peer_buf
, key
.ifname
,
1422 /* Handle case where a context more complex ctx is present.
1423 * input has no iface nor local-address, but a context may
1428 hash_walk(bfd_key_hash
,
1429 &bfd_key_lookup_ignore_partial_walker
,
1434 log_debug(" peer %s found, but ifp"
1435 " and/or loc-addr params ignored");
1443 * Delete functions searches and remove the item from the hash and
1444 * returns a pointer to the removed item data. If the item was not found
1445 * then it returns NULL.
1447 * The data stored inside the hash is not free()ed, so you must do it
1448 * manually after getting the pointer back.
1450 struct bfd_session
*bfd_id_delete(uint32_t id
)
1452 struct bfd_session bs
;
1454 bs
.discrs
.my_discr
= id
;
1456 return hash_release(bfd_id_hash
, &bs
);
1459 struct bfd_session
*bfd_key_delete(struct bfd_key key
)
1461 struct bfd_session bs
, *bsp
;
1464 bsp
= hash_lookup(bfd_key_hash
, &bs
);
1465 if (bsp
== NULL
&& key
.ifname
[0]) {
1466 memset(bs
.key
.ifname
, 0, sizeof(bs
.key
.ifname
));
1467 bsp
= hash_lookup(bfd_key_hash
, &bs
);
1470 return hash_release(bfd_key_hash
, bsp
);
1473 /* Iteration functions. */
1474 void bfd_id_iterate(hash_iter_func hif
, void *arg
)
1476 hash_iterate(bfd_id_hash
, hif
, arg
);
1479 void bfd_key_iterate(hash_iter_func hif
, void *arg
)
1481 hash_iterate(bfd_key_hash
, hif
, arg
);
1487 * Inserts session into hash and returns `true` on success, otherwise
1490 bool bfd_id_insert(struct bfd_session
*bs
)
1492 return (hash_get(bfd_id_hash
, bs
, hash_alloc_intern
) == bs
);
1495 bool bfd_key_insert(struct bfd_session
*bs
)
1497 return (hash_get(bfd_key_hash
, bs
, hash_alloc_intern
) == bs
);
1500 void bfd_initialize(void)
1502 bfd_id_hash
= hash_create(bfd_id_hash_do
, bfd_id_hash_cmp
,
1503 "BFD session discriminator hash");
1504 bfd_key_hash
= hash_create(bfd_key_hash_do
, bfd_key_hash_cmp
,
1505 "BFD session hash");
1508 static void _bfd_free(struct hash_bucket
*hb
,
1509 void *arg
__attribute__((__unused__
)))
1511 struct bfd_session
*bs
= hb
->data
;
1513 bfd_session_free(bs
);
1516 void bfd_shutdown(void)
1519 * Close and free all BFD sessions.
1521 * _bfd_free() will call bfd_session_free() which will take care
1522 * of removing the session from all hashes, so we just run an
1523 * assert() here to make sure it really happened.
1525 bfd_id_iterate(_bfd_free
, NULL
);
1526 assert(bfd_key_hash
->count
== 0);
1528 /* Now free the hashes themselves. */
1529 hash_free(bfd_id_hash
);
1530 hash_free(bfd_key_hash
);
1533 struct bfd_session_iterator
{
1536 const struct bfd_session
*bsi_bs
;
1539 static int _bfd_session_next(struct hash_bucket
*hb
, void *arg
)
1541 struct bfd_session_iterator
*bsi
= arg
;
1542 struct bfd_session
*bs
= hb
->data
;
1544 /* Previous entry signaled stop. */
1545 if (bsi
->bsi_stop
== 1) {
1546 /* Match the single/multi hop sessions. */
1547 if (bs
->key
.mhop
!= bsi
->bsi_mhop
)
1548 return HASHWALK_CONTINUE
;
1551 return HASHWALK_ABORT
;
1554 /* We found the current item, stop in the next one. */
1555 if (bsi
->bsi_bs
== hb
->data
) {
1557 /* Set entry to NULL to signal end of list. */
1559 } else if (bsi
->bsi_bs
== NULL
&& bsi
->bsi_mhop
== bs
->key
.mhop
) {
1560 /* We want the first list item. */
1562 bsi
->bsi_bs
= hb
->data
;
1563 return HASHWALK_ABORT
;
1566 return HASHWALK_CONTINUE
;
1570 * bfd_session_next: uses the current session to find the next.
1572 * `bs` might point to NULL to get the first item of the data structure.
1574 const struct bfd_session
*bfd_session_next(const struct bfd_session
*bs
,
1577 struct bfd_session_iterator bsi
;
1581 bsi
.bsi_mhop
= mhop
;
1582 hash_walk(bfd_key_hash
, _bfd_session_next
, &bsi
);
1583 if (bsi
.bsi_stop
== 0)
1589 static void _bfd_session_remove_manual(struct hash_bucket
*hb
,
1590 void *arg
__attribute__((__unused__
)))
1592 struct bfd_session
*bs
= hb
->data
;
1594 /* Delete only manually configured sessions. */
1595 if (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_CONFIG
) == 0)
1599 BFD_UNSET_FLAG(bs
->flags
, BFD_SESS_FLAG_CONFIG
);
1601 /* Don't delete sessions still in use. */
1602 if (bs
->refcount
!= 0)
1605 bfd_session_free(bs
);
1609 * bfd_sessions_remove_manual: remove all manually configured sessions.
1611 * NOTE: this function doesn't remove automatically created sessions.
1613 void bfd_sessions_remove_manual(void)
1615 hash_iterate(bfd_key_hash
, _bfd_session_remove_manual
, NULL
);
1619 * VRF related functions.
1621 static int bfd_vrf_new(struct vrf
*vrf
)
1623 log_debug("VRF Created: %s(%u)", vrf
->name
, vrf
->vrf_id
);
1627 static int bfd_vrf_delete(struct vrf
*vrf
)
1629 log_debug("VRF Deletion: %s(%u)", vrf
->name
, vrf
->vrf_id
);
1633 static int bfd_vrf_update(struct vrf
*vrf
)
1635 if (!vrf_is_enabled(vrf
))
1637 log_debug("VRF update: %s(%u)", vrf
->name
, vrf
->vrf_id
);
1638 /* a different name is given; update bfd list */
1639 bfdd_sessions_enable_vrf(vrf
);
1643 static int bfd_vrf_enable(struct vrf
*vrf
)
1645 struct bfd_vrf_global
*bvrf
;
1647 /* a different name */
1649 bvrf
= XCALLOC(MTYPE_BFDD_VRF
, sizeof(struct bfd_vrf_global
));
1651 vrf
->info
= (void *)bvrf
;
1654 log_debug("VRF enable add %s id %u", vrf
->name
, vrf
->vrf_id
);
1655 if (vrf
->vrf_id
== VRF_DEFAULT
||
1656 vrf_get_backend() == VRF_BACKEND_NETNS
) {
1658 bvrf
->bg_shop
= bp_udp_shop(vrf
->vrf_id
);
1660 bvrf
->bg_mhop
= bp_udp_mhop(vrf
->vrf_id
);
1661 if (!bvrf
->bg_shop6
)
1662 bvrf
->bg_shop6
= bp_udp6_shop(vrf
->vrf_id
);
1663 if (!bvrf
->bg_mhop6
)
1664 bvrf
->bg_mhop6
= bp_udp6_mhop(vrf
->vrf_id
);
1666 bvrf
->bg_echo
= bp_echo_socket(vrf
->vrf_id
);
1667 if (!bvrf
->bg_echov6
)
1668 bvrf
->bg_echov6
= bp_echov6_socket(vrf
->vrf_id
);
1670 /* Add descriptors to the event loop. */
1671 if (!bvrf
->bg_ev
[0])
1672 thread_add_read(master
, bfd_recv_cb
, bvrf
, bvrf
->bg_shop
,
1674 if (!bvrf
->bg_ev
[1])
1675 thread_add_read(master
, bfd_recv_cb
, bvrf
, bvrf
->bg_mhop
,
1677 if (!bvrf
->bg_ev
[2])
1678 thread_add_read(master
, bfd_recv_cb
, bvrf
, bvrf
->bg_shop6
,
1680 if (!bvrf
->bg_ev
[3])
1681 thread_add_read(master
, bfd_recv_cb
, bvrf
, bvrf
->bg_mhop6
,
1683 if (!bvrf
->bg_ev
[4])
1684 thread_add_read(master
, bfd_recv_cb
, bvrf
, bvrf
->bg_echo
,
1686 if (!bvrf
->bg_ev
[5])
1687 thread_add_read(master
, bfd_recv_cb
, bvrf
, bvrf
->bg_echov6
,
1690 if (vrf
->vrf_id
!= VRF_DEFAULT
) {
1691 bfdd_zclient_register(vrf
->vrf_id
);
1692 bfdd_sessions_enable_vrf(vrf
);
1697 static int bfd_vrf_disable(struct vrf
*vrf
)
1699 struct bfd_vrf_global
*bvrf
;
1705 if (vrf
->vrf_id
!= VRF_DEFAULT
) {
1706 bfdd_sessions_disable_vrf(vrf
);
1707 bfdd_zclient_unregister(vrf
->vrf_id
);
1710 log_debug("VRF disable %s id %d", vrf
->name
, vrf
->vrf_id
);
1711 /* Close all descriptors. */
1712 socket_close(&bvrf
->bg_echo
);
1713 socket_close(&bvrf
->bg_shop
);
1714 socket_close(&bvrf
->bg_mhop
);
1715 socket_close(&bvrf
->bg_shop6
);
1716 socket_close(&bvrf
->bg_mhop6
);
1717 socket_close(&bvrf
->bg_echo
);
1718 socket_close(&bvrf
->bg_echov6
);
1721 XFREE(MTYPE_BFDD_VRF
, bvrf
);
1727 void bfd_vrf_init(void)
1729 vrf_init(bfd_vrf_new
, bfd_vrf_enable
, bfd_vrf_disable
,
1730 bfd_vrf_delete
, bfd_vrf_update
);
1733 void bfd_vrf_terminate(void)
1738 struct bfd_vrf_global
*bfd_vrf_look_by_session(struct bfd_session
*bfd
)
1742 if (!vrf_is_backend_netns()) {
1743 vrf
= vrf_lookup_by_id(VRF_DEFAULT
);
1745 return (struct bfd_vrf_global
*)vrf
->info
;
1752 return bfd
->vrf
->info
;
1755 void bfd_session_update_vrf_name(struct bfd_session
*bs
, struct vrf
*vrf
)
1760 hash_release(bfd_key_hash
, bs
);
1762 * HACK: Change the BFD VRF in the running configuration directly,
1763 * bypassing the northbound layer. This is necessary to avoid deleting
1764 * the BFD and readding it in the new VRF, which would have
1765 * several implications.
1767 if (yang_module_find("frr-bfdd") && bs
->key
.vrfname
[0]) {
1768 struct lyd_node
*bfd_dnode
;
1769 char xpath
[XPATH_MAXLEN
], xpath_srcaddr
[XPATH_MAXLEN
+ 32];
1770 char addr_buf
[INET6_ADDRSTRLEN
];
1775 inet_ntop(bs
->key
.family
, &bs
->key
.local
, addr_buf
, sizeof(addr_buf
));
1776 snprintf(xpath_srcaddr
, sizeof(xpath_srcaddr
), "[source-addr='%s']",
1779 xpath_srcaddr
[0] = 0;
1780 inet_ntop(bs
->key
.family
, &bs
->key
.peer
, addr_buf
, sizeof(addr_buf
));
1781 slen
= snprintf(xpath
, sizeof(xpath
),
1782 "/frr-bfdd:bfdd/bfd/sessions/%s%s[dest-addr='%s']",
1783 bs
->key
.mhop
? "multi-hop" : "single-hop", xpath_srcaddr
,
1785 if (bs
->key
.ifname
[0])
1786 slen
+= snprintf(xpath
+ slen
, sizeof(xpath
) - slen
,
1787 "[interface='%s']", bs
->key
.ifname
);
1789 slen
+= snprintf(xpath
+ slen
, sizeof(xpath
) - slen
,
1791 snprintf(xpath
+ slen
, sizeof(xpath
) - slen
, "[vrf='%s']/vrf",
1794 bfd_dnode
= yang_dnode_get(running_config
->dnode
, xpath
,
1797 yang_dnode_change_leaf(bfd_dnode
, vrf
->name
);
1798 running_config
->version
++;
1801 memset(bs
->key
.vrfname
, 0, sizeof(bs
->key
.vrfname
));
1802 strlcpy(bs
->key
.vrfname
, vrf
->name
, sizeof(bs
->key
.vrfname
));
1803 hash_get(bfd_key_hash
, bs
, hash_alloc_intern
);