1 /*********************************************************************
2 * Copyright 2017 Cumulus Networks, Inc. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; either version 2 of the License, or (at your option)
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along
15 * with this program; see the file COPYING; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 * bfd_packet.c: implements the BFD protocol packet handling.
22 * Shrijeet Mukherjee [shm@cumulusnetworks.com]
23 * Kanna Rajagopal [kanna@cumulusnetworks.com]
24 * Radhika Mahankali [Radhika@cumulusnetworks.com]
30 #include <linux/if_packet.h>
31 #endif /* BFD_LINUX */
33 #include <netinet/if_ether.h>
34 #include <netinet/udp.h>
36 #include "lib/sockopt.h"
44 static int ptm_bfd_process_echo_pkt(int s
);
45 int _ptm_bfd_send(struct bfd_session
*bs
, uint16_t *port
, const void *data
,
48 static void bfd_sd_reschedule(int sd
);
49 ssize_t
bfd_recv_ipv4(int sd
, uint8_t *msgbuf
, size_t msgbuflen
, uint8_t *ttl
,
50 char *port
, size_t portlen
, char *vrfname
,
51 size_t vrfnamelen
, struct sockaddr_any
*local
,
52 struct sockaddr_any
*peer
);
53 ssize_t
bfd_recv_ipv6(int sd
, uint8_t *msgbuf
, size_t msgbuflen
, uint8_t *ttl
,
54 char *port
, size_t portlen
, char *vrfname
,
55 size_t vrfnamelen
, struct sockaddr_any
*local
,
56 struct sockaddr_any
*peer
);
57 int bp_udp_send(int sd
, uint8_t ttl
, uint8_t *data
, size_t datalen
,
58 struct sockaddr
*to
, socklen_t tolen
);
59 int bp_bfd_echo_in(int sd
, uint8_t *ttl
, uint32_t *my_discr
);
61 /* socket related prototypes */
62 static void bp_set_ipopts(int sd
);
63 static void bp_bind_ip(int sd
, uint16_t port
);
64 static void bp_set_ipv6opts(int sd
);
65 static void bp_bind_ipv6(int sd
, uint16_t port
);
71 int _ptm_bfd_send(struct bfd_session
*bs
, uint16_t *port
, const void *data
,
75 struct sockaddr_in sin
;
76 struct sockaddr_in6 sin6
;
81 if (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_IPV6
)) {
82 memset(&sin6
, 0, sizeof(sin6
));
83 sin6
.sin6_family
= AF_INET6
;
84 sin6
.sin6_addr
= bs
->shop
.peer
.sa_sin6
.sin6_addr
;
87 : (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_MH
))
88 ? htons(BFD_DEF_MHOP_DEST_PORT
)
89 : htons(BFD_DEFDESTPORT
);
92 sa
= (struct sockaddr
*)&sin6
;
95 memset(&sin
, 0, sizeof(sin
));
96 sin
.sin_family
= AF_INET
;
97 sin
.sin_addr
= bs
->shop
.peer
.sa_sin
.sin_addr
;
100 : (BFD_CHECK_FLAG(bs
->flags
, BFD_SESS_FLAG_MH
))
101 ? htons(BFD_DEF_MHOP_DEST_PORT
)
102 : htons(BFD_DEFDESTPORT
);
105 sa
= (struct sockaddr
*)&sin
;
109 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
111 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
112 rv
= sendto(sd
, data
, datalen
, 0, sa
, slen
);
114 log_debug("packet-send: send failure: %s", strerror(errno
));
117 if (rv
< (ssize_t
)datalen
)
118 log_debug("packet-send: send partial", strerror(errno
));
123 void ptm_bfd_echo_snd(struct bfd_session
*bfd
)
125 struct sockaddr_any
*sa
;
128 struct bfd_echo_pkt bep
;
129 struct sockaddr_in sin
;
130 struct sockaddr_in6 sin6
;
132 if (!BFD_CHECK_FLAG(bfd
->flags
, BFD_SESS_FLAG_ECHO_ACTIVE
))
133 BFD_SET_FLAG(bfd
->flags
, BFD_SESS_FLAG_ECHO_ACTIVE
);
135 memset(&bep
, 0, sizeof(bep
));
136 bep
.ver
= BFD_ECHO_VERSION
;
137 bep
.len
= BFD_ECHO_PKT_LEN
;
138 bep
.my_discr
= htonl(bfd
->discrs
.my_discr
);
140 sa
= BFD_CHECK_FLAG(bfd
->flags
, BFD_SESS_FLAG_MH
) ? &bfd
->mhop
.peer
142 if (BFD_CHECK_FLAG(bfd
->flags
, BFD_SESS_FLAG_IPV6
)) {
143 sd
= bglobal
.bg_echov6
;
145 sin6
.sin6_port
= htons(BFD_DEF_ECHO_PORT
);
146 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
147 sin6
.sin6_len
= sizeof(sin6
);
148 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
150 sa
= (struct sockaddr_any
*)&sin6
;
151 salen
= sizeof(sin6
);
153 sd
= bglobal
.bg_echo
;
155 sin
.sin_port
= htons(BFD_DEF_ECHO_PORT
);
156 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
157 sin
.sin_len
= sizeof(sin
);
158 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
160 sa
= (struct sockaddr_any
*)&sin
;
163 if (bp_udp_send(sd
, BFD_TTL_VAL
, (uint8_t *)&bep
, sizeof(bep
),
164 (struct sockaddr
*)sa
, salen
)
168 bfd
->stats
.tx_echo_pkt
++;
171 static int ptm_bfd_process_echo_pkt(int s
)
173 struct bfd_session
*bfd
;
174 uint32_t my_discr
= 0;
177 /* Receive and parse echo packet. */
178 if (bp_bfd_echo_in(s
, &ttl
, &my_discr
) == -1)
181 /* Your discriminator not zero - use it to find session */
182 bfd
= bfd_id_lookup(my_discr
);
184 log_debug("echo-packet: no matching session (id:%u)", my_discr
);
188 if (!BFD_CHECK_FLAG(bfd
->flags
, BFD_SESS_FLAG_ECHO_ACTIVE
)) {
189 log_debug("echo-packet: echo disabled [%s]", my_discr
,
194 bfd
->stats
.rx_echo_pkt
++;
196 /* Compute detect time */
197 bfd
->echo_detect_TO
= bfd
->remote_detect_mult
* bfd
->echo_xmt_TO
;
199 /* Update echo receive timeout. */
200 bfd_echo_recvtimer_update(bfd
);
205 void ptm_bfd_snd(struct bfd_session
*bfd
, int fbit
)
209 /* Set fields according to section 6.5.7 */
210 cp
.diag
= bfd
->local_diag
;
211 BFD_SETVER(cp
.diag
, BFD_VERSION
);
213 BFD_SETSTATE(cp
.flags
, bfd
->ses_state
);
214 BFD_SETDEMANDBIT(cp
.flags
, BFD_DEF_DEMAND
);
215 BFD_SETPBIT(cp
.flags
, bfd
->polling
);
216 BFD_SETFBIT(cp
.flags
, fbit
);
217 cp
.detect_mult
= bfd
->detect_mult
;
218 cp
.len
= BFD_PKT_LEN
;
219 cp
.discrs
.my_discr
= htonl(bfd
->discrs
.my_discr
);
220 cp
.discrs
.remote_discr
= htonl(bfd
->discrs
.remote_discr
);
222 cp
.timers
.desired_min_tx
=
223 htonl(bfd
->new_timers
.desired_min_tx
);
224 cp
.timers
.required_min_rx
=
225 htonl(bfd
->new_timers
.required_min_rx
);
227 cp
.timers
.desired_min_tx
= htonl(bfd
->timers
.desired_min_tx
);
228 cp
.timers
.required_min_rx
= htonl(bfd
->timers
.required_min_rx
);
230 cp
.timers
.required_min_echo
= htonl(bfd
->timers
.required_min_echo
);
232 if (_ptm_bfd_send(bfd
, NULL
, &cp
, BFD_PKT_LEN
) != 0)
235 bfd
->stats
.tx_ctrl_pkt
++;
238 ssize_t
bfd_recv_ipv4(int sd
, uint8_t *msgbuf
, size_t msgbuflen
, uint8_t *ttl
,
239 char *port
, size_t portlen
, char *vrfname
,
240 size_t vrfnamelen
, struct sockaddr_any
*local
,
241 struct sockaddr_any
*peer
)
246 struct sockaddr_in msgaddr
;
247 struct msghdr msghdr
;
249 uint8_t cmsgbuf
[255];
251 /* Prepare the recvmsg params. */
252 iov
[0].iov_base
= msgbuf
;
253 iov
[0].iov_len
= msgbuflen
;
255 memset(&msghdr
, 0, sizeof(msghdr
));
256 msghdr
.msg_name
= &msgaddr
;
257 msghdr
.msg_namelen
= sizeof(msgaddr
);
258 msghdr
.msg_iov
= iov
;
259 msghdr
.msg_iovlen
= 1;
260 msghdr
.msg_control
= cmsgbuf
;
261 msghdr
.msg_controllen
= sizeof(cmsgbuf
);
263 mlen
= recvmsg(sd
, &msghdr
, MSG_DONTWAIT
);
266 log_error("ipv4-recv: recv failed: %s",
272 /* Get source address */
273 peer
->sa_sin
= *((struct sockaddr_in
*)(msghdr
.msg_name
));
275 /* Get and check TTL */
276 for (cm
= CMSG_FIRSTHDR(&msghdr
); cm
!= NULL
;
277 cm
= CMSG_NXTHDR(&msghdr
, cm
)) {
278 if (cm
->cmsg_level
!= IPPROTO_IP
)
281 switch (cm
->cmsg_type
) {
286 memcpy(&ttlval
, CMSG_DATA(cm
), sizeof(ttlval
));
288 log_debug("ipv4-recv: invalid TTL: %u", ttlval
);
296 struct in_pktinfo
*pi
=
297 (struct in_pktinfo
*)CMSG_DATA(cm
);
302 local
->sa_sin
.sin_family
= AF_INET
;
303 local
->sa_sin
.sin_addr
= pi
->ipi_addr
;
304 fetch_portname_from_ifindex(pi
->ipi_ifindex
, port
,
308 #endif /* BFD_LINUX */
311 memcpy(ttl
, CMSG_DATA(cm
), sizeof(*ttl
));
315 case IP_RECVDSTADDR
: {
318 memcpy(&ia
, CMSG_DATA(cm
), sizeof(ia
));
319 local
->sa_sin
.sin_family
= AF_INET
;
320 local
->sa_sin
.sin_addr
= ia
;
327 * On *BSDs we expect to land here when skipping
328 * the IP_RECVIF header. It will be handled by
329 * getsockopt_ifindex() below.
336 /* OS agnostic way of getting interface name. */
338 ifindex
= getsockopt_ifindex(AF_INET
, &msghdr
);
340 fetch_portname_from_ifindex(ifindex
, port
, portlen
);
346 ssize_t
bfd_recv_ipv6(int sd
, uint8_t *msgbuf
, size_t msgbuflen
, uint8_t *ttl
,
347 char *port
, size_t portlen
, char *vrfname
,
348 size_t vrfnamelen
, struct sockaddr_any
*local
,
349 struct sockaddr_any
*peer
)
352 struct in6_pktinfo
*pi6
= NULL
;
356 struct sockaddr_in6 msgaddr6
;
357 struct msghdr msghdr6
;
359 uint8_t cmsgbuf6
[255];
361 /* Prepare the recvmsg params. */
362 iov
[0].iov_base
= msgbuf
;
363 iov
[0].iov_len
= msgbuflen
;
365 memset(&msghdr6
, 0, sizeof(msghdr6
));
366 msghdr6
.msg_name
= &msgaddr6
;
367 msghdr6
.msg_namelen
= sizeof(msgaddr6
);
368 msghdr6
.msg_iov
= iov
;
369 msghdr6
.msg_iovlen
= 1;
370 msghdr6
.msg_control
= cmsgbuf6
;
371 msghdr6
.msg_controllen
= sizeof(cmsgbuf6
);
373 mlen
= recvmsg(sd
, &msghdr6
, MSG_DONTWAIT
);
376 log_error("ipv6-recv: recv failed: %s",
382 /* Get source address */
383 peer
->sa_sin6
= *((struct sockaddr_in6
*)(msghdr6
.msg_name
));
385 /* Get and check TTL */
386 for (cm
= CMSG_FIRSTHDR(&msghdr6
); cm
!= NULL
;
387 cm
= CMSG_NXTHDR(&msghdr6
, cm
)) {
388 if (cm
->cmsg_level
!= IPPROTO_IPV6
)
391 if (cm
->cmsg_type
== IPV6_HOPLIMIT
) {
392 memcpy(&ttlval
, CMSG_DATA(cm
), sizeof(ttlval
));
394 log_debug("ipv6-recv: invalid TTL: %u", ttlval
);
399 } else if (cm
->cmsg_type
== IPV6_PKTINFO
) {
400 pi6
= (struct in6_pktinfo
*)CMSG_DATA(cm
);
402 local
->sa_sin
.sin_family
= AF_INET6
;
403 local
->sa_sin6
.sin6_addr
= pi6
->ipi6_addr
;
404 fetch_portname_from_ifindex(pi6
->ipi6_ifindex
,
406 ifindex
= pi6
->ipi6_ifindex
;
411 /* Set scope ID for link local addresses. */
412 if (IN6_IS_ADDR_LINKLOCAL(&peer
->sa_sin6
.sin6_addr
))
413 peer
->sa_sin6
.sin6_scope_id
= ifindex
;
414 if (IN6_IS_ADDR_LINKLOCAL(&local
->sa_sin6
.sin6_addr
))
415 local
->sa_sin6
.sin6_scope_id
= ifindex
;
420 static void bfd_sd_reschedule(int sd
)
422 if (sd
== bglobal
.bg_shop
) {
423 bglobal
.bg_ev
[0] = NULL
;
424 thread_add_read(master
, bfd_recv_cb
, NULL
, bglobal
.bg_shop
,
426 } else if (sd
== bglobal
.bg_mhop
) {
427 bglobal
.bg_ev
[1] = NULL
;
428 thread_add_read(master
, bfd_recv_cb
, NULL
, bglobal
.bg_mhop
,
430 } else if (sd
== bglobal
.bg_shop6
) {
431 bglobal
.bg_ev
[2] = NULL
;
432 thread_add_read(master
, bfd_recv_cb
, NULL
, bglobal
.bg_shop6
,
434 } else if (sd
== bglobal
.bg_mhop6
) {
435 bglobal
.bg_ev
[3] = NULL
;
436 thread_add_read(master
, bfd_recv_cb
, NULL
, bglobal
.bg_mhop6
,
438 } else if (sd
== bglobal
.bg_echo
) {
439 bglobal
.bg_ev
[4] = NULL
;
440 thread_add_read(master
, bfd_recv_cb
, NULL
, bglobal
.bg_echo
,
442 } else if (sd
== bglobal
.bg_echov6
) {
443 bglobal
.bg_ev
[5] = NULL
;
444 thread_add_read(master
, bfd_recv_cb
, NULL
, bglobal
.bg_echov6
,
449 static void cp_debug(bool mhop
, struct sockaddr_any
*peer
,
450 struct sockaddr_any
*local
, const char *port
,
451 const char *vrf
, const char *fmt
, ...)
453 char buf
[512], peerstr
[128], localstr
[128], portstr
[64], vrfstr
[64];
456 if (peer
->sa_sin
.sin_family
)
457 snprintf(peerstr
, sizeof(peerstr
), " peer:%s", satostr(peer
));
461 if (local
->sa_sin
.sin_family
)
462 snprintf(localstr
, sizeof(localstr
), " local:%s",
468 snprintf(portstr
, sizeof(portstr
), " port:%s", port
);
473 snprintf(vrfstr
, sizeof(vrfstr
), " vrf:%s", port
);
478 vsnprintf(buf
, sizeof(buf
), fmt
, vl
);
481 log_debug("control-packet: %s [mhop:%s%s%s%s%s]", buf
,
482 mhop
? "yes" : "no", peerstr
, localstr
, portstr
, vrfstr
);
485 int bfd_recv_cb(struct thread
*t
)
487 int sd
= THREAD_FD(t
);
488 struct bfd_session
*bfd
;
492 uint32_t oldEchoXmt_TO
, oldXmtTime
;
494 struct sockaddr_any local
, peer
;
495 char port
[MAXNAMELEN
+ 1], vrfname
[MAXNAMELEN
+ 1];
496 uint8_t msgbuf
[1516];
498 /* Schedule next read. */
499 bfd_sd_reschedule(sd
);
501 /* Handle echo packets. */
502 if (sd
== bglobal
.bg_echo
|| sd
== bglobal
.bg_echov6
) {
503 ptm_bfd_process_echo_pkt(sd
);
507 /* Sanitize input/output. */
508 memset(port
, 0, sizeof(port
));
509 memset(vrfname
, 0, sizeof(vrfname
));
510 memset(&local
, 0, sizeof(local
));
511 memset(&peer
, 0, sizeof(peer
));
513 /* Handle control packets. */
515 if (sd
== bglobal
.bg_shop
|| sd
== bglobal
.bg_mhop
) {
516 is_mhop
= sd
== bglobal
.bg_mhop
;
517 mlen
= bfd_recv_ipv4(sd
, msgbuf
, sizeof(msgbuf
), &ttl
, port
,
518 sizeof(port
), vrfname
, sizeof(vrfname
),
520 } else if (sd
== bglobal
.bg_shop6
|| sd
== bglobal
.bg_mhop6
) {
521 is_mhop
= sd
== bglobal
.bg_mhop6
;
522 mlen
= bfd_recv_ipv6(sd
, msgbuf
, sizeof(msgbuf
), &ttl
, port
,
523 sizeof(port
), vrfname
, sizeof(vrfname
),
527 /* Implement RFC 5880 6.8.6 */
528 if (mlen
< BFD_PKT_LEN
) {
529 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
,
530 "too small (%ld bytes)", mlen
);
534 /* Validate packet TTL. */
535 if ((is_mhop
== false) && (ttl
!= BFD_TTL_VAL
)) {
536 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
,
537 "invalid TTL: %d expected %d", ttl
, BFD_TTL_VAL
);
542 * Parse the control header for inconsistencies:
544 * - Bad multiplier configuration;
546 * - Invalid discriminator;
548 cp
= (struct bfd_pkt
*)(msgbuf
);
549 if (BFD_GETVER(cp
->diag
) != BFD_VERSION
) {
550 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
,
551 "bad version %d", BFD_GETVER(cp
->diag
));
555 if (cp
->detect_mult
== 0) {
556 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
,
557 "detect multiplier set to zero");
561 if ((cp
->len
< BFD_PKT_LEN
) || (cp
->len
> mlen
)) {
562 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
, "too small");
566 if (cp
->discrs
.my_discr
== 0) {
567 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
,
568 "'my discriminator' is zero");
572 /* Find the session that this packet belongs. */
573 bfd
= ptm_bfd_sess_find(cp
, port
, &peer
, &local
, vrfname
, is_mhop
);
575 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
,
580 bfd
->stats
.rx_ctrl_pkt
++;
583 * Multi hop: validate packet TTL.
584 * Single hop: set local address that received the packet.
587 if ((BFD_TTL_VAL
- bfd
->mh_ttl
) > BFD_TTL_VAL
) {
588 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
,
589 "exceeded max hop count (expected %d, got %d)",
590 bfd
->mh_ttl
, BFD_TTL_VAL
);
593 } else if (bfd
->local_ip
.sa_sin
.sin_family
== AF_UNSPEC
) {
594 bfd
->local_ip
= local
;
598 * If no interface was detected, save the interface where the
601 if (bfd
->ifindex
== 0)
602 bfd
->ifindex
= ptm_bfd_fetch_ifindex(port
);
604 /* Log remote discriminator changes. */
605 if ((bfd
->discrs
.remote_discr
!= 0)
606 && (bfd
->discrs
.remote_discr
!= ntohl(cp
->discrs
.my_discr
)))
607 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
,
608 "remote discriminator mismatch (expected %d, got %d)",
609 bfd
->discrs
.remote_discr
, ntohl(cp
->discrs
.my_discr
));
611 bfd
->discrs
.remote_discr
= ntohl(cp
->discrs
.my_discr
);
613 /* If received the Final bit, the new values should take effect */
614 if (bfd
->polling
&& BFD_GETFBIT(cp
->flags
)) {
615 bfd
->timers
.desired_min_tx
= bfd
->new_timers
.desired_min_tx
;
616 bfd
->timers
.required_min_rx
= bfd
->new_timers
.required_min_rx
;
617 bfd
->new_timers
.desired_min_tx
= 0;
618 bfd
->new_timers
.required_min_rx
= 0;
622 if (!bfd
->demand_mode
) {
623 /* Compute detect time */
624 bfd
->detect_TO
= cp
->detect_mult
625 * ((bfd
->timers
.required_min_rx
626 > ntohl(cp
->timers
.desired_min_tx
))
627 ? bfd
->timers
.required_min_rx
628 : ntohl(cp
->timers
.desired_min_tx
));
629 bfd
->remote_detect_mult
= cp
->detect_mult
;
631 cp_debug(is_mhop
, &peer
, &local
, port
, vrfname
,
632 "unsupported demand mode");
634 /* Save remote diagnostics before state switch. */
635 bfd
->remote_diag
= cp
->diag
& BFD_DIAGMASK
;
637 /* State switch from section 6.8.6 */
638 if (BFD_GETSTATE(cp
->flags
) == PTM_BFD_ADM_DOWN
) {
639 if (bfd
->ses_state
!= PTM_BFD_DOWN
)
640 ptm_bfd_ses_dn(bfd
, BD_NEIGHBOR_DOWN
);
642 switch (bfd
->ses_state
) {
644 if (BFD_GETSTATE(cp
->flags
) == PTM_BFD_INIT
)
646 else if (BFD_GETSTATE(cp
->flags
) == PTM_BFD_DOWN
)
647 bfd
->ses_state
= PTM_BFD_INIT
;
650 if (BFD_GETSTATE(cp
->flags
) == PTM_BFD_INIT
651 || BFD_GETSTATE(cp
->flags
) == PTM_BFD_UP
)
655 if (BFD_GETSTATE(cp
->flags
) == PTM_BFD_DOWN
)
656 ptm_bfd_ses_dn(bfd
, BD_NEIGHBOR_DOWN
);
662 * Handle echo packet status:
663 * - Start echo packets if configured and permitted
664 * (required_min_echo > 0);
665 * - Stop echo packets if not allowed (required_min_echo == 0);
666 * - Recalculate echo packet interval;
668 if (BFD_CHECK_FLAG(bfd
->flags
, BFD_SESS_FLAG_ECHO
)) {
669 if (BFD_CHECK_FLAG(bfd
->flags
, BFD_SESS_FLAG_ECHO_ACTIVE
)) {
670 if (!ntohl(cp
->timers
.required_min_echo
)) {
671 ptm_bfd_echo_stop(bfd
, 1);
673 oldEchoXmt_TO
= bfd
->echo_xmt_TO
;
675 bfd
->timers
.required_min_echo
;
676 if (ntohl(cp
->timers
.required_min_echo
)
678 bfd
->echo_xmt_TO
= ntohl(
679 cp
->timers
.required_min_echo
);
680 if (oldEchoXmt_TO
!= bfd
->echo_xmt_TO
)
681 ptm_bfd_echo_start(bfd
);
683 } else if (ntohl(cp
->timers
.required_min_echo
)) {
684 bfd
->echo_xmt_TO
= bfd
->timers
.required_min_echo
;
685 if (ntohl(cp
->timers
.required_min_echo
)
688 ntohl(cp
->timers
.required_min_echo
);
689 ptm_bfd_echo_start(bfd
);
693 if (BFD_CHECK_FLAG(bfd
->flags
, BFD_SESS_FLAG_ECHO_ACTIVE
)) {
694 bfd
->echo_xmt_TO
= bfd
->timers
.required_min_echo
;
695 if (ntohl(cp
->timers
.required_min_echo
) > bfd
->echo_xmt_TO
)
696 bfd
->echo_xmt_TO
= ntohl(cp
->timers
.required_min_echo
);
699 /* Calculate new transmit time */
700 oldXmtTime
= bfd
->xmt_TO
;
702 (bfd
->timers
.desired_min_tx
> ntohl(cp
->timers
.required_min_rx
))
703 ? bfd
->timers
.desired_min_tx
704 : ntohl(cp
->timers
.required_min_rx
);
706 /* If transmit time has changed, and too much time until next xmt,
709 if (BFD_GETPBIT(cp
->flags
)) {
710 ptm_bfd_xmt_TO(bfd
, 1);
711 } else if (oldXmtTime
!= bfd
->xmt_TO
) {
712 /* XXX add some skid to this as well */
713 ptm_bfd_start_xmt_timer(bfd
, false);
716 /* Restart detection timer (packet received) */
717 if (!bfd
->demand_mode
)
718 bfd_recvtimer_update(bfd
);
721 * Save the timers and state sent by the remote end
722 * for debugging and statistics.
724 if (BFD_GETFBIT(cp
->flags
)) {
725 bfd
->remote_timers
.desired_min_tx
=
726 ntohl(cp
->timers
.desired_min_tx
);
727 bfd
->remote_timers
.required_min_rx
=
728 ntohl(cp
->timers
.required_min_rx
);
729 bfd
->remote_timers
.required_min_echo
=
730 ntohl(cp
->timers
.required_min_echo
);
732 control_notify_config(BCM_NOTIFY_CONFIG_UPDATE
, bfd
);
739 * bp_bfd_echo_in: proccesses an BFD echo packet. On TTL == BFD_TTL_VAL
740 * the packet is looped back or returns the my discriminator ID along
743 * Returns -1 on error or loopback or 0 on success.
745 int bp_bfd_echo_in(int sd
, uint8_t *ttl
, uint32_t *my_discr
)
747 struct bfd_echo_pkt
*bep
;
749 struct sockaddr_any local
, peer
;
750 char port
[MAXNAMELEN
+ 1], vrfname
[MAXNAMELEN
+ 1];
751 uint8_t msgbuf
[1516];
753 if (sd
== bglobal
.bg_echo
)
754 rlen
= bfd_recv_ipv4(sd
, msgbuf
, sizeof(msgbuf
), ttl
, port
,
755 sizeof(port
), vrfname
, sizeof(vrfname
),
758 rlen
= bfd_recv_ipv6(sd
, msgbuf
, sizeof(msgbuf
), ttl
, port
,
759 sizeof(port
), vrfname
, sizeof(vrfname
),
762 /* Short packet, better not risk reading it. */
763 if (rlen
< (ssize_t
)sizeof(*bep
)) {
764 cp_debug(false, &peer
, &local
, port
, vrfname
,
765 "small echo packet");
769 /* Test for loopback. */
770 if (*ttl
== BFD_TTL_VAL
) {
771 bp_udp_send(sd
, *ttl
- 1, msgbuf
, rlen
,
772 (struct sockaddr
*)&peer
,
773 (sd
== bglobal
.bg_echo
) ? sizeof(peer
.sa_sin
)
774 : sizeof(peer
.sa_sin6
));
778 /* Read my discriminator from BFD Echo packet. */
779 bep
= (struct bfd_echo_pkt
*)msgbuf
;
780 *my_discr
= ntohl(bep
->my_discr
);
781 if (*my_discr
== 0) {
782 cp_debug(false, &peer
, &local
, port
, vrfname
,
783 "invalid echo packet discriminator (zero)");
790 int bp_udp_send(int sd
, uint8_t ttl
, uint8_t *data
, size_t datalen
,
791 struct sockaddr
*to
, socklen_t tolen
)
793 struct cmsghdr
*cmsg
;
796 bool is_ipv6
= to
->sa_family
== AF_INET6
;
801 /* Prepare message data. */
802 iov
[0].iov_base
= data
;
803 iov
[0].iov_len
= datalen
;
805 memset(&msg
, 0, sizeof(msg
));
806 memset(msgctl
, 0, sizeof(msgctl
));
808 msg
.msg_namelen
= tolen
;
812 /* Prepare the packet TTL information. */
814 /* Use ancillary data. */
815 msg
.msg_control
= msgctl
;
816 msg
.msg_controllen
= CMSG_LEN(sizeof(ttlval
));
818 /* Configure the ancillary data. */
819 cmsg
= CMSG_FIRSTHDR(&msg
);
820 cmsg
->cmsg_len
= CMSG_LEN(sizeof(ttlval
));
822 cmsg
->cmsg_level
= IPPROTO_IPV6
;
823 cmsg
->cmsg_type
= IPV6_HOPLIMIT
;
826 cmsg
->cmsg_level
= IPPROTO_IP
;
827 cmsg
->cmsg_type
= IP_TTL
;
829 /* FreeBSD does not support TTL in ancillary data. */
830 msg
.msg_control
= NULL
;
831 msg
.msg_controllen
= 0;
836 memcpy(CMSG_DATA(cmsg
), &ttlval
, sizeof(ttlval
));
839 /* Send echo back. */
840 wlen
= sendmsg(sd
, &msg
, 0);
842 log_debug("udp-send: loopback failure: (%d) %s", errno
, strerror(errno
));
844 } else if (wlen
< (ssize_t
)datalen
) {
845 log_debug("udp-send: partial send: %ld expected %ld", wlen
,
862 int bp_set_ttl(int sd
, uint8_t value
)
866 if (setsockopt(sd
, IPPROTO_IP
, IP_TTL
, &ttl
, sizeof(ttl
)) == -1) {
867 log_warning("set-ttl: setsockopt(IP_TTL, %d): %s", value
,
875 int bp_set_tos(int sd
, uint8_t value
)
879 if (setsockopt(sd
, IPPROTO_IP
, IP_TOS
, &tos
, sizeof(tos
)) == -1) {
880 log_warning("set-tos: setsockopt(IP_TOS, %d): %s", value
,
888 static void bp_set_ipopts(int sd
)
890 int rcvttl
= BFD_RCV_TTL_VAL
;
892 if (bp_set_ttl(sd
, BFD_TTL_VAL
) != 0)
893 log_fatal("set-ipopts: TTL configuration failed");
895 if (setsockopt(sd
, IPPROTO_IP
, IP_RECVTTL
, &rcvttl
, sizeof(rcvttl
))
897 log_fatal("set-ipopts: setsockopt(IP_RECVTTL, %d): %s", rcvttl
,
901 int pktinfo
= BFD_PKT_INFO_VAL
;
903 /* Figure out address and interface to do the peer matching. */
904 if (setsockopt(sd
, IPPROTO_IP
, IP_PKTINFO
, &pktinfo
, sizeof(pktinfo
))
906 log_fatal("set-ipopts: setsockopt(IP_PKTINFO, %d): %s", pktinfo
,
908 #endif /* BFD_LINUX */
912 /* Find out our address for peer matching. */
913 if (setsockopt(sd
, IPPROTO_IP
, IP_RECVDSTADDR
, &yes
, sizeof(yes
)) == -1)
914 log_fatal("set-ipopts: setsockopt(IP_RECVDSTADDR, %d): %s", yes
,
917 /* Find out interface where the packet came in. */
918 if (setsockopt_ifindex(AF_INET
, sd
, yes
) == -1)
919 log_fatal("set-ipopts: setsockopt_ipv4_ifindex(%d): %s", yes
,
924 static void bp_bind_ip(int sd
, uint16_t port
)
926 struct sockaddr_in sin
;
928 memset(&sin
, 0, sizeof(sin
));
929 sin
.sin_family
= AF_INET
;
930 sin
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
931 sin
.sin_port
= htons(port
);
932 if (bind(sd
, (struct sockaddr
*)&sin
, sizeof(sin
)) == -1)
933 log_fatal("bind-ip: bind: %s", strerror(errno
));
936 int bp_udp_shop(void)
940 sd
= socket(AF_INET
, SOCK_DGRAM
, PF_UNSPEC
);
942 log_fatal("udp-shop: socket: %s", strerror(errno
));
945 bp_bind_ip(sd
, BFD_DEFDESTPORT
);
950 int bp_udp_mhop(void)
954 sd
= socket(AF_INET
, SOCK_DGRAM
, PF_UNSPEC
);
956 log_fatal("udp-mhop: socket: %s", strerror(errno
));
959 bp_bind_ip(sd
, BFD_DEF_MHOP_DEST_PORT
);
964 int bp_peer_socket(struct bfd_peer_cfg
*bpc
)
967 struct sockaddr_in sin
;
968 static int srcPort
= BFD_SRCPORTINIT
;
970 sd
= socket(AF_INET
, SOCK_DGRAM
, PF_UNSPEC
);
972 log_error("ipv4-new: failed to create socket: %s",
977 /* Set TTL to 255 for all transmitted packets */
978 if (bp_set_ttl(sd
, BFD_TTL_VAL
) != 0) {
983 /* Set TOS to CS6 for all transmitted packets */
984 if (bp_set_tos(sd
, BFD_TOS_VAL
) != 0) {
989 if (bpc
->bpc_has_localif
) {
990 if (bp_bind_dev(sd
, bpc
->bpc_localif
) != 0) {
994 } else if (bpc
->bpc_mhop
&& bpc
->bpc_has_vrfname
) {
995 if (bp_bind_dev(sd
, bpc
->bpc_vrfname
) != 0) {
1001 /* Find an available source port in the proper range */
1002 memset(&sin
, 0, sizeof(sin
));
1003 sin
= bpc
->bpc_local
.sa_sin
;
1004 sin
.sin_family
= AF_INET
;
1005 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1006 sin
.sin_len
= sizeof(sin
);
1007 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
1009 sin
.sin_addr
= bpc
->bpc_local
.sa_sin
.sin_addr
;
1011 sin
.sin_addr
.s_addr
= INADDR_ANY
;
1015 if ((++pcount
) > (BFD_SRCPORTMAX
- BFD_SRCPORTINIT
)) {
1016 /* Searched all ports, none available */
1017 log_error("ipv4-new: failed to bind port: %s",
1022 if (srcPort
>= BFD_SRCPORTMAX
)
1023 srcPort
= BFD_SRCPORTINIT
;
1024 sin
.sin_port
= htons(srcPort
++);
1025 } while (bind(sd
, (struct sockaddr
*)&sin
, sizeof(sin
)) < 0);
1035 int bp_peer_socketv6(struct bfd_peer_cfg
*bpc
)
1037 int sd
, pcount
, ifindex
;
1038 struct sockaddr_in6 sin6
;
1039 static int srcPort
= BFD_SRCPORTINIT
;
1041 sd
= socket(AF_INET6
, SOCK_DGRAM
, PF_UNSPEC
);
1043 log_error("ipv6-new: failed to create socket: %s",
1048 /* Set TTL to 255 for all transmitted packets */
1049 if (bp_set_ttlv6(sd
, BFD_TTL_VAL
) != 0) {
1054 /* Set TOS to CS6 for all transmitted packets */
1055 if (bp_set_tosv6(sd
, BFD_TOS_VAL
) != 0) {
1060 /* Find an available source port in the proper range */
1061 memset(&sin6
, 0, sizeof(sin6
));
1062 sin6
.sin6_family
= AF_INET6
;
1063 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1064 sin6
.sin6_len
= sizeof(sin6
);
1065 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
1066 sin6
= bpc
->bpc_local
.sa_sin6
;
1067 ifindex
= ptm_bfd_fetch_ifindex(bpc
->bpc_localif
);
1068 if (IN6_IS_ADDR_LINKLOCAL(&sin6
.sin6_addr
))
1069 sin6
.sin6_scope_id
= ifindex
;
1071 if (bpc
->bpc_has_localif
) {
1072 if (bp_bind_dev(sd
, bpc
->bpc_localif
) != 0) {
1076 } else if (bpc
->bpc_mhop
&& bpc
->bpc_has_vrfname
) {
1077 if (bp_bind_dev(sd
, bpc
->bpc_vrfname
) != 0) {
1085 if ((++pcount
) > (BFD_SRCPORTMAX
- BFD_SRCPORTINIT
)) {
1086 /* Searched all ports, none available */
1087 log_error("ipv6-new: failed to bind port: %s",
1092 if (srcPort
>= BFD_SRCPORTMAX
)
1093 srcPort
= BFD_SRCPORTINIT
;
1094 sin6
.sin6_port
= htons(srcPort
++);
1095 } while (bind(sd
, (struct sockaddr
*)&sin6
, sizeof(sin6
)) < 0);
1100 int bp_set_ttlv6(int sd
, uint8_t value
)
1104 if (setsockopt(sd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
, &ttl
, sizeof(ttl
))
1106 log_warning("set-ttlv6: setsockopt(IPV6_UNICAST_HOPS, %d): %s",
1107 value
, strerror(errno
));
1114 int bp_set_tosv6(int sd
, uint8_t value
)
1118 if (setsockopt(sd
, IPPROTO_IPV6
, IPV6_TCLASS
, &tos
, sizeof(tos
))
1120 log_warning("set-tosv6: setsockopt(IPV6_TCLASS, %d): %s", value
,
1128 static void bp_set_ipv6opts(int sd
)
1130 int ipv6_pktinfo
= BFD_IPV6_PKT_INFO_VAL
;
1131 int ipv6_only
= BFD_IPV6_ONLY_VAL
;
1133 if (bp_set_ttlv6(sd
, BFD_TTL_VAL
) == -1)
1134 log_fatal("set-ipv6opts: setsockopt(IPV6_UNICAST_HOPS, %d): %s",
1135 BFD_TTL_VAL
, strerror(errno
));
1137 if (setsockopt_ipv6_hoplimit(sd
, BFD_RCV_TTL_VAL
) == -1)
1138 log_fatal("set-ipv6opts: setsockopt(IPV6_HOPLIMIT, %d): %s",
1139 BFD_RCV_TTL_VAL
, strerror(errno
));
1141 if (setsockopt_ipv6_pktinfo(sd
, ipv6_pktinfo
) == -1)
1142 log_fatal("set-ipv6opts: setsockopt(IPV6_PKTINFO, %d): %s",
1143 ipv6_pktinfo
, strerror(errno
));
1145 if (setsockopt(sd
, IPPROTO_IPV6
, IPV6_V6ONLY
, &ipv6_only
,
1148 log_fatal("set-ipv6opts: setsockopt(IPV6_V6ONLY, %d): %s",
1149 ipv6_only
, strerror(errno
));
1152 static void bp_bind_ipv6(int sd
, uint16_t port
)
1154 struct sockaddr_in6 sin6
;
1156 memset(&sin6
, 0, sizeof(sin6
));
1157 sin6
.sin6_family
= AF_INET6
;
1158 sin6
.sin6_addr
= in6addr_any
;
1159 sin6
.sin6_port
= htons(port
);
1160 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1161 sin6
.sin6_len
= sizeof(sin6
);
1162 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
1163 if (bind(sd
, (struct sockaddr
*)&sin6
, sizeof(sin6
)) == -1)
1164 log_fatal("bind-ipv6: bind: %s", strerror(errno
));
1167 int bp_udp6_shop(void)
1171 sd
= socket(AF_INET6
, SOCK_DGRAM
, PF_UNSPEC
);
1173 log_fatal("udp6-shop: socket: %s", strerror(errno
));
1175 bp_set_ipv6opts(sd
);
1176 bp_bind_ipv6(sd
, BFD_DEFDESTPORT
);
1181 int bp_udp6_mhop(void)
1185 sd
= socket(AF_INET6
, SOCK_DGRAM
, PF_UNSPEC
);
1187 log_fatal("udp6-mhop: socket: %s", strerror(errno
));
1189 bp_set_ipv6opts(sd
);
1190 bp_bind_ipv6(sd
, BFD_DEF_MHOP_DEST_PORT
);
1195 int bp_echo_socket(void)
1199 s
= socket(AF_INET
, SOCK_DGRAM
, 0);
1201 log_fatal("echo-socket: socket: %s", strerror(errno
));
1204 bp_bind_ip(s
, BFD_DEF_ECHO_PORT
);
1209 int bp_echov6_socket(void)
1213 s
= socket(AF_INET6
, SOCK_DGRAM
, 0);
1215 log_fatal("echov6-socket: socket: %s", strerror(errno
));
1218 bp_bind_ipv6(s
, BFD_DEF_ECHO_PORT
);