2 * bfd.c: BFD handling routines
4 * @copyright Copyright (C) 2015 Cumulus Networks, Inc.
6 * This file is part of GNU Zebra.
8 * GNU Zebra is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2, or (at your option) any
13 * GNU Zebra is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; see the file COPYING; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
35 DEFINE_MTYPE_STATIC(LIB
, BFD_INFO
, "BFD info")
37 static int bfd_debug
= 0;
38 static struct bfd_gbl bfd_gbl
;
41 * bfd_gbl_init - Initialize the BFD global structure
43 void bfd_gbl_init(void)
45 memset(&bfd_gbl
, 0, sizeof(struct bfd_gbl
));
49 * bfd_gbl_exit - Called when daemon exits
51 void bfd_gbl_exit(void)
53 SET_FLAG(bfd_gbl
.flags
, BFD_GBL_FLAG_IN_SHUTDOWN
);
57 * bfd_info_create - Allocate the BFD information
59 struct bfd_info
*bfd_info_create(void)
61 struct bfd_info
*bfd_info
;
63 bfd_info
= XCALLOC(MTYPE_BFD_INFO
, sizeof(struct bfd_info
));
66 bfd_info
->status
= BFD_STATUS_UNKNOWN
;
67 bfd_info
->type
= BFD_TYPE_NOT_CONFIGURED
;
68 bfd_info
->last_update
= 0;
73 * bfd_info_free - Free the BFD information.
75 void bfd_info_free(struct bfd_info
**bfd_info
)
77 XFREE(MTYPE_BFD_INFO
, *bfd_info
);
81 * bfd_validate_param - Validate the BFD paramter information.
83 int bfd_validate_param(struct vty
*vty
, const char *dm_str
, const char *rx_str
,
84 const char *tx_str
, uint8_t *dm_val
, uint32_t *rx_val
,
87 *dm_val
= strtoul(dm_str
, NULL
, 10);
88 *rx_val
= strtoul(rx_str
, NULL
, 10);
89 *tx_val
= strtoul(tx_str
, NULL
, 10);
94 * bfd_set_param - Set the configured BFD paramter values
96 void bfd_set_param(struct bfd_info
**bfd_info
, uint32_t min_rx
, uint32_t min_tx
,
97 uint8_t detect_mult
, int defaults
, int *command
)
100 *bfd_info
= bfd_info_create();
101 *command
= ZEBRA_BFD_DEST_REGISTER
;
103 if (((*bfd_info
)->required_min_rx
!= min_rx
)
104 || ((*bfd_info
)->desired_min_tx
!= min_tx
)
105 || ((*bfd_info
)->detect_mult
!= detect_mult
))
106 *command
= ZEBRA_BFD_DEST_UPDATE
;
110 (*bfd_info
)->required_min_rx
= min_rx
;
111 (*bfd_info
)->desired_min_tx
= min_tx
;
112 (*bfd_info
)->detect_mult
= detect_mult
;
116 SET_FLAG((*bfd_info
)->flags
, BFD_FLAG_PARAM_CFG
);
118 UNSET_FLAG((*bfd_info
)->flags
, BFD_FLAG_PARAM_CFG
);
122 * bfd_peer_sendmsg - Format and send a peer register/Unregister
123 * command to Zebra to be forwarded to BFD
125 void bfd_peer_sendmsg(struct zclient
*zclient
, struct bfd_info
*bfd_info
,
126 int family
, void *dst_ip
, void *src_ip
, char *if_name
,
127 int ttl
, int multihop
, int cbit
, int command
,
128 int set_flag
, vrf_id_t vrf_id
)
130 struct bfd_session_arg args
= {};
133 /* Individual reg/dereg messages are suppressed during shutdown. */
134 if (CHECK_FLAG(bfd_gbl
.flags
, BFD_GBL_FLAG_IN_SHUTDOWN
)) {
137 "%s: Suppressing BFD peer reg/dereg messages",
143 if (!zclient
|| zclient
->sock
< 0) {
146 "%s: Can't send BFD peer register, Zebra client not "
152 /* Fill in all arguments. */
155 args
.family
= family
;
156 args
.mhop
= multihop
;
157 args
.vrf_id
= vrf_id
;
158 args
.command
= command
;
159 args
.set_flag
= set_flag
;
160 args
.bfd_info
= bfd_info
;
162 args
.min_rx
= bfd_info
->required_min_rx
;
163 args
.min_tx
= bfd_info
->desired_min_tx
;
164 args
.detection_multiplier
= bfd_info
->detect_mult
;
167 addrlen
= family
== AF_INET
? sizeof(struct in_addr
)
168 : sizeof(struct in6_addr
);
169 memcpy(&args
.dst
, dst_ip
, addrlen
);
171 memcpy(&args
.src
, src_ip
, addrlen
);
175 strlcpy(args
.ifname
, if_name
, sizeof(args
.ifname
));
177 zclient_bfd_command(zclient
, &args
);
181 * bfd_get_command_dbg_str - Convert command to a debug string.
183 const char *bfd_get_command_dbg_str(int command
)
186 case ZEBRA_BFD_DEST_REGISTER
:
188 case ZEBRA_BFD_DEST_DEREGISTER
:
190 case ZEBRA_BFD_DEST_UPDATE
:
198 * bfd_get_peer_info - Extract the Peer information for which the BFD session
199 * went down from the message sent from Zebra to clients.
201 struct interface
*bfd_get_peer_info(struct stream
*s
, struct prefix
*dp
,
202 struct prefix
*sp
, int *status
,
206 unsigned int ifindex
;
207 struct interface
*ifp
= NULL
;
209 int local_remote_cbit
;
211 /* Get interface index. */
212 ifindex
= stream_getl(s
);
216 ifp
= if_lookup_by_index(ifindex
, vrf_id
);
220 "zebra_interface_bfd_read: "
221 "Can't find interface by ifindex: %d ",
227 /* Fetch destination address. */
228 dp
->family
= stream_getc(s
);
230 plen
= prefix_blen(dp
);
231 stream_get(&dp
->u
.prefix
, s
, plen
);
232 dp
->prefixlen
= stream_getc(s
);
234 /* Get BFD status. */
235 *status
= stream_getl(s
);
238 sp
->family
= stream_getc(s
);
240 plen
= prefix_blen(sp
);
241 stream_get(&sp
->u
.prefix
, s
, plen
);
242 sp
->prefixlen
= stream_getc(s
);
244 local_remote_cbit
= stream_getc(s
);
246 *remote_cbit
= local_remote_cbit
;
251 * bfd_get_status_str - Convert BFD status to a display string.
253 const char *bfd_get_status_str(int status
)
256 case BFD_STATUS_DOWN
:
260 case BFD_STATUS_ADMIN_DOWN
:
262 case BFD_STATUS_UNKNOWN
:
269 * bfd_last_update - Calculate the last BFD update time and convert it
270 * into a dd:hh:mm:ss display format.
272 static void bfd_last_update(time_t last_update
, char *buf
, size_t len
)
279 /* If no BFD satatus update has ever been received, print `never'. */
280 if (last_update
== 0) {
281 snprintf(buf
, len
, "never");
285 /* Get current time. */
288 diff
= curr
- last_update
;
289 gmtime_r(&diff
, &tm
);
291 snprintf(buf
, len
, "%d:%02d:%02d:%02d", tm
.tm_yday
, tm
.tm_hour
,
292 tm
.tm_min
, tm
.tm_sec
);
296 * bfd_show_param - Show the BFD parameter information.
298 void bfd_show_param(struct vty
*vty
, struct bfd_info
*bfd_info
, int bfd_tag
,
299 int extra_space
, bool use_json
, json_object
*json_obj
)
301 json_object
*json_bfd
= NULL
;
308 json_bfd
= json_object_new_object();
312 json_object_int_add(json_bfd
, "detectMultiplier",
313 bfd_info
->detect_mult
);
314 json_object_int_add(json_bfd
, "rxMinInterval",
315 bfd_info
->required_min_rx
);
316 json_object_int_add(json_bfd
, "txMinInterval",
317 bfd_info
->desired_min_tx
);
319 json_object_object_add(json_obj
, "peerBfdInfo",
323 " %s%sDetect Multiplier: %d, Min Rx interval: %d,"
324 " Min Tx interval: %d\n",
325 (extra_space
) ? " " : "", (bfd_tag
) ? "BFD: " : " ",
326 bfd_info
->detect_mult
, bfd_info
->required_min_rx
,
327 bfd_info
->desired_min_tx
);
332 * bfd_show_status - Show the BFD status information.
334 static void bfd_show_status(struct vty
*vty
, struct bfd_info
*bfd_info
,
335 int bfd_tag
, int extra_space
, bool use_json
,
336 json_object
*json_bfd
)
343 bfd_last_update(bfd_info
->last_update
, time_buf
, 32);
345 json_object_string_add(json_bfd
, "status",
346 bfd_get_status_str(bfd_info
->status
));
347 json_object_string_add(json_bfd
, "lastUpdate", time_buf
);
349 vty_out(vty
, " %s%sStatus: %s, Last update: %s\n",
350 (extra_space
) ? " " : "", (bfd_tag
) ? "BFD: " : " ",
351 bfd_get_status_str(bfd_info
->status
), time_buf
);
356 * bfd_show_info - Show the BFD information.
358 void bfd_show_info(struct vty
*vty
, struct bfd_info
*bfd_info
, int multihop
,
359 int extra_space
, bool use_json
, json_object
*json_obj
)
361 json_object
*json_bfd
= NULL
;
367 json_bfd
= json_object_new_object();
369 json_object_string_add(json_bfd
, "type", "multi hop");
371 json_object_string_add(json_bfd
, "type", "single hop");
373 vty_out(vty
, " %sBFD: Type: %s\n", (extra_space
) ? " " : "",
374 (multihop
) ? "multi hop" : "single hop");
377 bfd_show_param(vty
, bfd_info
, 0, extra_space
, use_json
, json_bfd
);
378 bfd_show_status(vty
, bfd_info
, 0, extra_space
, use_json
, json_bfd
);
381 json_object_object_add(json_obj
, "peerBfdInfo", json_bfd
);
387 * bfd_client_sendmsg - Format and send a client register
388 * command to Zebra to be forwarded to BFD
390 void bfd_client_sendmsg(struct zclient
*zclient
, int command
,
397 if (!zclient
|| zclient
->sock
< 0) {
400 "%s: Can't send BFD client register, Zebra client not "
408 zclient_create_header(s
, command
, vrf_id
);
410 stream_putl(s
, getpid());
412 stream_putw_at(s
, 0, stream_get_endp(s
));
414 ret
= zclient_send_message(zclient
);
419 "bfd_client_sendmsg %ld: zclient_send_message() failed",
427 int zclient_bfd_command(struct zclient
*zc
, struct bfd_session_arg
*args
)
433 if (!zc
|| zc
->sock
< 0) {
435 zlog_debug("%s: zclient unavailable", __func__
);
442 /* Create new message. */
443 zclient_create_header(s
, args
->command
, args
->vrf_id
);
444 stream_putl(s
, getpid());
446 /* Encode destination address. */
447 stream_putw(s
, args
->family
);
448 addrlen
= (args
->family
== AF_INET
) ? sizeof(struct in_addr
)
449 : sizeof(struct in6_addr
);
450 stream_put(s
, &args
->dst
, addrlen
);
452 /* Encode timers if this is a registration message. */
453 if (args
->command
!= ZEBRA_BFD_DEST_DEREGISTER
) {
454 stream_putl(s
, args
->min_rx
);
455 stream_putl(s
, args
->min_tx
);
456 stream_putc(s
, args
->detection_multiplier
);
460 /* Multi hop indicator. */
463 /* Multi hop always sends the source address. */
464 stream_putw(s
, args
->family
);
465 stream_put(s
, &args
->src
, addrlen
);
467 /* Send the expected TTL. */
468 stream_putc(s
, args
->ttl
);
470 /* Multi hop indicator. */
473 /* Single hop only sends the source address when IPv6. */
474 if (args
->family
== AF_INET6
) {
475 stream_putw(s
, args
->family
);
476 stream_put(s
, &args
->src
, addrlen
);
479 /* Send interface name if any. */
480 stream_putc(s
, args
->ifnamelen
);
482 stream_put(s
, args
->ifname
, args
->ifnamelen
);
485 /* Send the C bit indicator. */
486 stream_putc(s
, args
->cbit
);
488 /* `ptm-bfd` doesn't support profiles yet. */
490 /* Send profile name if any. */
491 stream_putc(s
, args
->profilelen
);
492 if (args
->profilelen
)
493 stream_put(s
, args
->profile
, args
->profilelen
);
494 #endif /* HAVE_BFDD */
496 /* Finish the message by writing the size. */
497 stream_putw_at(s
, 0, stream_get_endp(s
));
499 /* Send message to zebra. */
500 if (zclient_send_message(zc
) == -1) {
502 zlog_debug("%s: zclient_send_message failed", __func__
);
506 /* Write registration indicator into data structure. */
507 if (args
->bfd_info
&& args
->set_flag
) {
508 if (args
->command
== ZEBRA_BFD_DEST_REGISTER
)
509 SET_FLAG(args
->bfd_info
->flags
, BFD_FLAG_BFD_REG
);
510 else if (args
->command
== ZEBRA_BFD_DEST_DEREGISTER
)
511 UNSET_FLAG(args
->bfd_info
->flags
, BFD_FLAG_BFD_REG
);