1 /* Copyright (c) 2013, 2014, 2015, 2016, 2017 Nicira, Inc.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License. */
18 #include <sys/types.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
21 #include <netinet/in_systm.h>
22 #include <netinet/ip.h>
23 #include <sys/socket.h>
25 #include "byte-order.h"
26 #include "connectivity.h"
28 #include "dp-packet.h"
30 #include "openvswitch/dynamic-string.h"
33 #include "openvswitch/hmap.h"
34 #include "openvswitch/list.h"
37 #include "openvswitch/ofpbuf.h"
38 #include "ovs-thread.h"
39 #include "openvswitch/types.h"
41 #include "openvswitch/poll-loop.h"
46 #include "unaligned.h"
49 #include "openvswitch/vlog.h"
51 VLOG_DEFINE_THIS_MODULE(bfd
);
55 * The goal of this module is to replace CFM with something both more flexible
56 * and standards compliant. In service of this goal, the following needs to be
60 * * Implement Demand mode.
61 * * Go through the RFC line by line and verify we comply.
62 * * Test against a hardware implementation. Preferably a popular one.
63 * * Delete BFD packets with nw_ttl != 255 in the datapath to prevent DOS
68 * - Set TOS/PCP on the outer tunnel header when encapped.
70 * - Sending BFD messages should be in its own thread/process.
72 * - Scale testing. How does it operate when there are large number of bfd
73 * sessions? Do we ever have random flaps? What's the CPU utilization?
75 * - Rely on data traffic for liveness by using BFD demand mode.
76 * If we're receiving traffic on a port, we can safely assume it's up (modulo
77 * unidrectional failures). BFD has a demand mode in which it can stay quiet
78 * unless it feels the need to check the status of the port. Using this, we
79 * can implement a strategy in which BFD only sends control messages on dark
82 * - Depending on how one interprets the spec, it appears that a BFD session
83 * can never change bfd.LocalDiag to "No Diagnostic". We should verify that
84 * this is what hardware implementations actually do. Seems like "No
85 * Diagnostic" should be set once a BFD session state goes UP. */
90 FLAG_MULTIPOINT
= 1 << 0,
99 STATE_ADMIN_DOWN
= 0 << 6,
106 DIAG_NONE
= 0, /* No Diagnostic. */
107 DIAG_EXPIRED
= 1, /* Control Detection Time Expired. */
108 DIAG_ECHO_FAILED
= 2, /* Echo Function Failed. */
109 DIAG_RMT_DOWN
= 3, /* Neighbor Signaled Session Down. */
110 DIAG_FWD_RESET
= 4, /* Forwarding Plane Reset. */
111 DIAG_PATH_DOWN
= 5, /* Path Down. */
112 DIAG_CPATH_DOWN
= 6, /* Concatenated Path Down. */
113 DIAG_ADMIN_DOWN
= 7, /* Administratively Down. */
114 DIAG_RCPATH_DOWN
= 8 /* Reverse Concatenated Path Down. */
117 /* RFC 5880 Section 4.1
119 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
120 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
121 * |Vers | Diag |Sta|P|F|C|A|D|M| Detect Mult | Length |
122 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
123 * | My Discriminator |
124 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
125 * | Your Discriminator |
126 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
127 * | Desired Min TX Interval |
128 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
129 * | Required Min RX Interval |
130 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
131 * | Required Min Echo RX Interval |
132 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
134 uint8_t vers_diag
; /* Version and diagnostic. */
135 uint8_t flags
; /* 2bit State field followed by flags. */
136 uint8_t mult
; /* Fault detection multiplier. */
137 uint8_t length
; /* Length of this BFD message. */
138 ovs_be32 my_disc
; /* My discriminator. */
139 ovs_be32 your_disc
; /* Your discriminator. */
140 ovs_be32 min_tx
; /* Desired minimum tx interval. */
141 ovs_be32 min_rx
; /* Required minimum rx interval. */
142 ovs_be32 min_rx_echo
; /* Required minimum echo rx interval. */
144 BUILD_ASSERT_DECL(BFD_PACKET_LEN
== sizeof(struct msg
));
146 #define DIAG_MASK 0x1f
148 #define STATE_MASK 0xC0
149 #define FLAGS_MASK 0x3f
150 #define DEFAULT_MULT 3
153 struct hmap_node node
; /* In 'all_bfds'. */
154 uint32_t disc
; /* bfd.LocalDiscr. Key in 'all_bfds' hmap. */
156 char *name
; /* Name used for logging. */
158 bool cpath_down
; /* Concatenated Path Down. */
159 uint8_t mult
; /* bfd.DetectMult. */
160 uint8_t rmt_mult
; /* Remote bfd.DetectMult. */
162 struct netdev
*netdev
;
163 uint64_t rx_packets
; /* Packets received by 'netdev'. */
165 enum state state
; /* bfd.SessionState. */
166 enum state rmt_state
; /* bfd.RemoteSessionState. */
168 enum diag diag
; /* bfd.LocalDiag. */
169 enum diag rmt_diag
; /* Remote diagnostic. */
171 enum flags flags
; /* Flags sent on messages. */
172 enum flags rmt_flags
; /* Flags last received. */
174 bool oam
; /* Set tunnel OAM flag if applicable. */
176 uint32_t rmt_disc
; /* bfd.RemoteDiscr. */
178 struct eth_addr local_eth_src
; /* Local eth src address. */
179 struct eth_addr local_eth_dst
; /* Local eth dst address. */
181 struct eth_addr rmt_eth_dst
; /* Remote eth dst address. */
183 ovs_be32 ip_src
; /* IPv4 source address. */
184 ovs_be32 ip_dst
; /* IPv4 destination address. */
186 uint16_t udp_src
; /* UDP source port. */
188 /* All timers in milliseconds. */
189 long long int rmt_min_rx
; /* bfd.RemoteMinRxInterval. */
190 long long int rmt_min_tx
; /* Remote minimum TX interval. */
192 long long int cfg_min_tx
; /* Configured minimum TX rate. */
193 long long int cfg_min_rx
; /* Configured required minimum RX rate. */
194 long long int poll_min_tx
; /* Min TX negotating in a poll sequence. */
195 long long int poll_min_rx
; /* Min RX negotating in a poll sequence. */
196 long long int min_tx
; /* bfd.DesiredMinTxInterval. */
197 long long int min_rx
; /* bfd.RequiredMinRxInterval. */
199 long long int last_tx
; /* Last TX time. */
200 long long int next_tx
; /* Next TX time. */
201 long long int detect_time
; /* RFC 5880 6.8.4 Detection time. */
203 bool last_forwarding
; /* Last calculation of forwarding flag. */
204 int forwarding_override
; /* Manual override of 'forwarding' status. */
206 atomic_bool check_tnl_key
; /* Verify tunnel key of inbound packets? */
207 struct ovs_refcount ref_cnt
;
209 /* When forward_if_rx is true, bfd_forwarding() will return
210 * true as long as there are incoming packets received.
211 * Note, forwarding_override still has higher priority. */
212 bool forwarding_if_rx
;
213 long long int forwarding_if_rx_detect_time
;
215 /* When 'bfd->forwarding_if_rx' is set, at least one bfd control packet
216 * is required to be received every 100 * bfd->cfg_min_rx. If bfd
217 * control packet is not received within this interval, even if data
218 * packets are received, the bfd->forwarding will still be false. */
219 long long int demand_rx_bfd_time
;
221 /* BFD decay related variables. */
222 bool in_decay
; /* True when bfd is in decay. */
223 int decay_min_rx
; /* min_rx is set to decay_min_rx when */
225 int decay_rx_ctl
; /* Count bfd packets received within decay */
226 /* detect interval. */
227 uint64_t decay_rx_packets
; /* Packets received by 'netdev'. */
228 long long int decay_detect_time
; /* Decay detection time. */
230 uint64_t flap_count
; /* Counts bfd forwarding flaps. */
232 /* True when the variables returned by bfd_get_status() are changed
233 * since last check. */
237 static struct ovs_mutex mutex
= OVS_MUTEX_INITIALIZER
;
238 static struct hmap all_bfds__
= HMAP_INITIALIZER(&all_bfds__
);
239 static struct hmap
*const all_bfds
OVS_GUARDED_BY(mutex
) = &all_bfds__
;
241 static void bfd_lookup_ip(const char *host_name
, ovs_be32 def
, ovs_be32
*ip
)
243 static bool bfd_forwarding__(struct bfd
*) OVS_REQUIRES(mutex
);
244 static bool bfd_in_poll(const struct bfd
*) OVS_REQUIRES(mutex
);
245 static void bfd_poll(struct bfd
*bfd
) OVS_REQUIRES(mutex
);
246 static const char *bfd_diag_str(enum diag
) OVS_REQUIRES(mutex
);
247 static const char *bfd_state_str(enum state
) OVS_REQUIRES(mutex
);
248 static long long int bfd_min_tx(const struct bfd
*) OVS_REQUIRES(mutex
);
249 static long long int bfd_tx_interval(const struct bfd
*)
251 static long long int bfd_rx_interval(const struct bfd
*)
253 static void bfd_set_next_tx(struct bfd
*) OVS_REQUIRES(mutex
);
254 static void bfd_set_state(struct bfd
*, enum state
, enum diag
)
256 static uint32_t generate_discriminator(void) OVS_REQUIRES(mutex
);
257 static void bfd_put_details(struct ds
*, const struct bfd
*)
259 static uint64_t bfd_rx_packets(const struct bfd
*) OVS_REQUIRES(mutex
);
260 static void bfd_try_decay(struct bfd
*) OVS_REQUIRES(mutex
);
261 static void bfd_decay_update(struct bfd
*) OVS_REQUIRES(mutex
);
262 static void bfd_status_changed(struct bfd
*) OVS_REQUIRES(mutex
);
264 static void bfd_forwarding_if_rx_update(struct bfd
*) OVS_REQUIRES(mutex
);
265 static void bfd_unixctl_show(struct unixctl_conn
*, int argc
,
266 const char *argv
[], void *aux OVS_UNUSED
);
267 static void bfd_unixctl_set_forwarding_override(struct unixctl_conn
*,
268 int argc
, const char *argv
[],
269 void *aux OVS_UNUSED
);
270 static void log_msg(enum vlog_level
, const struct msg
*, const char *message
,
271 const struct bfd
*) OVS_REQUIRES(mutex
);
273 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(20, 20);
275 /* Returns true if the interface on which 'bfd' is running may be used to
276 * forward traffic according to the BFD session state. */
278 bfd_forwarding(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
282 ovs_mutex_lock(&mutex
);
283 ret
= bfd_forwarding__(bfd
);
284 ovs_mutex_unlock(&mutex
);
288 /* When forwarding_if_rx is enabled, if there are packets received,
289 * updates forwarding_if_rx_detect_time. */
291 bfd_account_rx(struct bfd
*bfd
, const struct dpif_flow_stats
*stats
)
293 if (stats
->n_packets
&& bfd
->forwarding_if_rx
) {
294 ovs_mutex_lock(&mutex
);
295 bfd_forwarding__(bfd
);
296 bfd_forwarding_if_rx_update(bfd
);
297 bfd_forwarding__(bfd
);
298 ovs_mutex_unlock(&mutex
);
302 /* Returns and resets the 'bfd->status_changed'. */
304 bfd_check_status_change(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
308 ovs_mutex_lock(&mutex
);
309 ret
= bfd
->status_changed
;
310 bfd
->status_changed
= false;
311 ovs_mutex_unlock(&mutex
);
316 /* Returns a 'smap' of key value pairs representing the status of 'bfd'
317 * intended for the OVS database. */
319 bfd_get_status(const struct bfd
*bfd
, struct smap
*smap
)
322 ovs_mutex_lock(&mutex
);
323 smap_add(smap
, "forwarding",
324 bfd_forwarding__(CONST_CAST(struct bfd
*, bfd
))
326 smap_add(smap
, "state", bfd_state_str(bfd
->state
));
327 smap_add(smap
, "diagnostic", bfd_diag_str(bfd
->diag
));
328 smap_add_format(smap
, "flap_count", "%"PRIu64
, bfd
->flap_count
);
329 smap_add(smap
, "remote_state", bfd_state_str(bfd
->rmt_state
));
330 smap_add(smap
, "remote_diagnostic", bfd_diag_str(bfd
->rmt_diag
));
331 ovs_mutex_unlock(&mutex
);
337 unixctl_command_register("bfd/show", "[interface]", 0, 1,
338 bfd_unixctl_show
, NULL
);
339 unixctl_command_register("bfd/set-forwarding",
340 "[interface] normal|false|true", 1, 2,
341 bfd_unixctl_set_forwarding_override
, NULL
);
344 /* Initializes, destroys, or reconfigures the BFD session 'bfd' (named 'name'),
345 * according to the database configuration contained in 'cfg'. Takes ownership
346 * of 'bfd', which may be NULL. Returns a BFD object which may be used as a
347 * handle for the session, or NULL if BFD is not enabled according to 'cfg'.
348 * Also returns NULL if cfg is NULL. */
350 bfd_configure(struct bfd
*bfd
, const char *name
, const struct smap
*cfg
,
351 struct netdev
*netdev
) OVS_EXCLUDED(mutex
)
353 static atomic_count udp_src
= ATOMIC_COUNT_INIT(0);
356 long long int min_tx
, min_rx
;
357 bool need_poll
= false;
358 bool cfg_min_rx_changed
= false;
359 bool cpath_down
, forwarding_if_rx
;
361 if (!cfg
|| !smap_get_bool(cfg
, "enable", false)) {
366 ovs_mutex_lock(&mutex
);
368 bfd
= xzalloc(sizeof *bfd
);
369 bfd
->name
= xstrdup(name
);
370 bfd
->forwarding_override
= -1;
371 bfd
->disc
= generate_discriminator();
372 hmap_insert(all_bfds
, &bfd
->node
, bfd
->disc
);
374 bfd
->diag
= DIAG_NONE
;
377 bfd
->mult
= DEFAULT_MULT
;
378 ovs_refcount_init(&bfd
->ref_cnt
);
379 bfd
->netdev
= netdev_ref(netdev
);
380 bfd
->rx_packets
= bfd_rx_packets(bfd
);
381 bfd
->in_decay
= false;
384 /* RFC 5881 section 4
385 * The source port MUST be in the range 49152 through 65535. The same
386 * UDP source port number MUST be used for all BFD Control packets
387 * associated with a particular session. The source port number SHOULD
388 * be unique among all BFD sessions on the system. */
389 bfd
->udp_src
= (atomic_count_inc(&udp_src
) % 16384) + 49152;
391 bfd_set_state(bfd
, STATE_DOWN
, DIAG_NONE
);
393 bfd_status_changed(bfd
);
396 int old_mult
= bfd
->mult
;
397 int new_mult
= smap_get_int(cfg
, "mult", DEFAULT_MULT
);
398 if (new_mult
< 1 || new_mult
> 255) {
399 new_mult
= DEFAULT_MULT
;
401 bfd
->mult
= new_mult
;
403 bfd
->oam
= smap_get_bool(cfg
, "oam", false);
405 atomic_store_relaxed(&bfd
->check_tnl_key
,
406 smap_get_bool(cfg
, "check_tnl_key", false));
407 min_tx
= smap_get_int(cfg
, "min_tx", 100);
408 min_tx
= MAX(min_tx
, 1);
409 if (bfd
->cfg_min_tx
!= min_tx
) {
410 bfd
->cfg_min_tx
= min_tx
;
411 if (bfd
->state
!= STATE_UP
412 || (!bfd_in_poll(bfd
) && bfd
->cfg_min_tx
< bfd
->min_tx
)) {
413 bfd
->min_tx
= bfd
->cfg_min_tx
;
418 min_rx
= smap_get_int(cfg
, "min_rx", 1000);
419 min_rx
= MAX(min_rx
, 1);
420 if (bfd
->cfg_min_rx
!= min_rx
) {
421 bfd
->cfg_min_rx
= min_rx
;
422 if (bfd
->state
!= STATE_UP
423 || (!bfd_in_poll(bfd
) && bfd
->cfg_min_rx
> bfd
->min_rx
)) {
424 bfd
->min_rx
= bfd
->cfg_min_rx
;
426 cfg_min_rx_changed
= true;
430 decay_min_rx
= smap_get_int(cfg
, "decay_min_rx", 0);
431 if (bfd
->decay_min_rx
!= decay_min_rx
|| cfg_min_rx_changed
) {
432 if (decay_min_rx
> 0 && decay_min_rx
< bfd
->cfg_min_rx
) {
433 VLOG_WARN("%s: decay_min_rx cannot be less than %lld ms",
434 bfd
->name
, bfd
->cfg_min_rx
);
435 bfd
->decay_min_rx
= 0;
437 bfd
->decay_min_rx
= decay_min_rx
;
440 bfd
->in_decay
= false;
441 bfd_decay_update(bfd
);
445 cpath_down
= smap_get_bool(cfg
, "cpath_down", false);
446 if (bfd
->cpath_down
!= cpath_down
) {
447 bfd
->cpath_down
= cpath_down
;
448 bfd_set_state(bfd
, bfd
->state
, DIAG_NONE
);
452 eth_addr_from_string(smap_get_def(cfg
, "bfd_local_src_mac", ""),
453 &bfd
->local_eth_src
);
454 eth_addr_from_string(smap_get_def(cfg
, "bfd_local_dst_mac", ""),
455 &bfd
->local_eth_dst
);
456 eth_addr_from_string(smap_get_def(cfg
, "bfd_remote_dst_mac", ""),
459 bfd_lookup_ip(smap_get_def(cfg
, "bfd_src_ip", ""),
460 htonl(0xA9FE0101) /* 169.254.1.1 */, &bfd
->ip_src
);
461 bfd_lookup_ip(smap_get_def(cfg
, "bfd_dst_ip", ""),
462 htonl(0xA9FE0100) /* 169.254.1.0 */, &bfd
->ip_dst
);
464 forwarding_if_rx
= smap_get_bool(cfg
, "forwarding_if_rx", false);
465 if (bfd
->forwarding_if_rx
!= forwarding_if_rx
) {
466 bfd
->forwarding_if_rx
= forwarding_if_rx
;
467 if (bfd
->state
== STATE_UP
&& bfd
->forwarding_if_rx
) {
468 bfd_forwarding_if_rx_update(bfd
);
470 bfd
->forwarding_if_rx_detect_time
= 0;
472 } else if (bfd
->state
== STATE_UP
&& bfd
->forwarding_if_rx
473 && old_mult
!= new_mult
) {
474 bfd_forwarding_if_rx_update(bfd
);
480 ovs_mutex_unlock(&mutex
);
485 bfd_ref(const struct bfd
*bfd_
)
487 struct bfd
*bfd
= CONST_CAST(struct bfd
*, bfd_
);
489 ovs_refcount_ref(&bfd
->ref_cnt
);
495 bfd_unref(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
497 if (bfd
&& ovs_refcount_unref_relaxed(&bfd
->ref_cnt
) == 1) {
498 ovs_mutex_lock(&mutex
);
499 bfd_status_changed(bfd
);
500 hmap_remove(all_bfds
, &bfd
->node
);
501 netdev_close(bfd
->netdev
);
504 ovs_mutex_unlock(&mutex
);
509 bfd_wait(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
511 long long int wake_time
= bfd_wake_time(bfd
);
512 poll_timer_wait_until(wake_time
);
516 /* Returns the next wake up time. */
518 bfd_wake_time(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
520 long long int retval
;
526 ovs_mutex_lock(&mutex
);
527 if (bfd
->flags
& FLAG_FINAL
) {
530 retval
= bfd
->next_tx
;
531 if (bfd
->state
> STATE_DOWN
) {
532 retval
= MIN(bfd
->detect_time
, retval
);
535 ovs_mutex_unlock(&mutex
);
540 bfd_run(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
545 ovs_mutex_lock(&mutex
);
547 old_in_decay
= bfd
->in_decay
;
549 if (bfd
->state
> STATE_DOWN
&& now
>= bfd
->detect_time
) {
550 bfd_set_state(bfd
, STATE_DOWN
, DIAG_EXPIRED
);
552 bfd_forwarding__(bfd
);
554 /* Decay may only happen when state is STATE_UP, bfd->decay_min_rx is
555 * configured, and decay_detect_time is reached. */
556 if (bfd
->state
== STATE_UP
&& bfd
->decay_min_rx
> 0
557 && now
>= bfd
->decay_detect_time
) {
561 if (bfd
->min_tx
!= bfd
->cfg_min_tx
562 || (bfd
->min_rx
!= bfd
->cfg_min_rx
&& bfd
->min_rx
!= bfd
->decay_min_rx
)
563 || bfd
->in_decay
!= old_in_decay
) {
566 ovs_mutex_unlock(&mutex
);
570 bfd_should_send_packet(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
573 ovs_mutex_lock(&mutex
);
574 ret
= bfd
->flags
& FLAG_FINAL
|| time_msec() >= bfd
->next_tx
;
575 ovs_mutex_unlock(&mutex
);
580 bfd_put_packet(struct bfd
*bfd
, struct dp_packet
*p
,
581 const struct eth_addr eth_src
, bool *oam
) OVS_EXCLUDED(mutex
)
583 long long int min_tx
, min_rx
;
584 struct udp_header
*udp
;
585 struct eth_header
*eth
;
586 struct ip_header
*ip
;
589 ovs_mutex_lock(&mutex
);
591 long long int delay
= time_msec() - bfd
->next_tx
;
592 long long int interval
= bfd_tx_interval(bfd
);
593 if (delay
> interval
* 3 / 2) {
594 VLOG_INFO("%s: long delay of %lldms (expected %lldms) sending BFD"
595 " control message", bfd
->name
, delay
, interval
);
599 /* RFC 5880 Section 6.5
600 * A BFD Control packet MUST NOT have both the Poll (P) and Final (F) bits
602 ovs_assert(!(bfd
->flags
& FLAG_POLL
) || !(bfd
->flags
& FLAG_FINAL
));
604 dp_packet_reserve(p
, 2); /* Properly align after the ethernet header. */
605 eth
= dp_packet_put_uninit(p
, sizeof *eth
);
606 eth
->eth_src
= eth_addr_is_zero(bfd
->local_eth_src
)
607 ? eth_src
: bfd
->local_eth_src
;
608 eth
->eth_dst
= eth_addr_is_zero(bfd
->local_eth_dst
)
609 ? eth_addr_bfd
: bfd
->local_eth_dst
;
610 eth
->eth_type
= htons(ETH_TYPE_IP
);
612 ip
= dp_packet_put_zeros(p
, sizeof *ip
);
613 ip
->ip_ihl_ver
= IP_IHL_VER(5, 4);
614 ip
->ip_tot_len
= htons(sizeof *ip
+ sizeof *udp
+ sizeof *msg
);
616 ip
->ip_tos
= IPTOS_PREC_INTERNETCONTROL
;
617 ip
->ip_proto
= IPPROTO_UDP
;
618 put_16aligned_be32(&ip
->ip_src
, bfd
->ip_src
);
619 put_16aligned_be32(&ip
->ip_dst
, bfd
->ip_dst
);
620 /* Checksum has already been zeroed by put_zeros call. */
621 ip
->ip_csum
= csum(ip
, sizeof *ip
);
623 udp
= dp_packet_put_zeros(p
, sizeof *udp
);
624 udp
->udp_src
= htons(bfd
->udp_src
);
625 udp
->udp_dst
= htons(BFD_DEST_PORT
);
626 udp
->udp_len
= htons(sizeof *udp
+ sizeof *msg
);
628 msg
= dp_packet_put_uninit(p
, sizeof *msg
);
629 msg
->vers_diag
= (BFD_VERSION
<< 5) | bfd
->diag
;
630 msg
->flags
= (bfd
->state
& STATE_MASK
) | bfd
->flags
;
632 msg
->mult
= bfd
->mult
;
633 msg
->length
= BFD_PACKET_LEN
;
634 msg
->my_disc
= htonl(bfd
->disc
);
635 msg
->your_disc
= htonl(bfd
->rmt_disc
);
636 msg
->min_rx_echo
= htonl(0);
638 if (bfd_in_poll(bfd
)) {
639 min_tx
= bfd
->poll_min_tx
;
640 min_rx
= bfd
->poll_min_rx
;
642 min_tx
= bfd_min_tx(bfd
);
643 min_rx
= bfd
->min_rx
;
646 msg
->min_tx
= htonl(min_tx
* 1000);
647 msg
->min_rx
= htonl(min_rx
* 1000);
649 bfd
->flags
&= ~FLAG_FINAL
;
652 log_msg(VLL_DBG
, msg
, "Sending BFD Message", bfd
);
654 bfd
->last_tx
= time_msec();
655 bfd_set_next_tx(bfd
);
656 ovs_mutex_unlock(&mutex
);
660 bfd_should_process_flow(const struct bfd
*bfd_
, const struct flow
*flow
,
661 struct flow_wildcards
*wc
)
663 struct bfd
*bfd
= CONST_CAST(struct bfd
*, bfd_
);
665 if (!eth_addr_is_zero(bfd
->rmt_eth_dst
)) {
666 memset(&wc
->masks
.dl_dst
, 0xff, sizeof wc
->masks
.dl_dst
);
668 if (!eth_addr_equals(bfd
->rmt_eth_dst
, flow
->dl_dst
)) {
673 if (flow
->dl_type
== htons(ETH_TYPE_IP
)) {
674 memset(&wc
->masks
.nw_proto
, 0xff, sizeof wc
->masks
.nw_proto
);
675 if (flow
->nw_proto
== IPPROTO_UDP
&& !(flow
->nw_frag
& FLOW_NW_FRAG_LATER
)) {
676 memset(&wc
->masks
.tp_dst
, 0xff, sizeof wc
->masks
.tp_dst
);
677 if (flow
->tp_dst
== htons(BFD_DEST_PORT
)) {
680 atomic_read_relaxed(&bfd
->check_tnl_key
, &check_tnl_key
);
682 memset(&wc
->masks
.tunnel
.tun_id
, 0xff,
683 sizeof wc
->masks
.tunnel
.tun_id
);
684 return flow
->tunnel
.tun_id
== htonll(0);
694 bfd_process_packet(struct bfd
*bfd
, const struct flow
*flow
,
695 const struct dp_packet
*p
) OVS_EXCLUDED(mutex
)
697 uint32_t rmt_min_rx
, pkt_your_disc
;
698 enum state rmt_state
;
702 const uint8_t *l7
= dp_packet_get_udp_payload(p
);
705 return; /* No UDP payload. */
708 /* This function is designed to follow section RFC 5880 6.8.6 closely. */
710 ovs_mutex_lock(&mutex
);
711 /* Increments the decay rx counter. */
714 bfd_forwarding__(bfd
);
716 if (flow
->nw_ttl
!= 255) {
717 /* XXX Should drop in the kernel to prevent DOS. */
721 msg
= dp_packet_at(p
, l7
- (uint8_t *)dp_packet_data(p
), BFD_PACKET_LEN
);
723 VLOG_INFO_RL(&rl
, "%s: Received too-short BFD control message (only "
724 "%"PRIdPTR
" bytes long, at least %d required).",
725 bfd
->name
, (uint8_t *) dp_packet_tail(p
) - l7
,
730 /* RFC 5880 Section 6.8.6
731 * If the Length field is greater than the payload of the encapsulating
732 * protocol, the packet MUST be discarded.
734 * Note that we make this check implicitly. Above we use dp_packet_at() to
735 * ensure that there are at least BFD_PACKET_LEN bytes in the payload of
736 * the encapsulating protocol. Below we require msg->length to be exactly
737 * BFD_PACKET_LEN bytes. */
739 flags
= msg
->flags
& FLAGS_MASK
;
740 rmt_state
= msg
->flags
& STATE_MASK
;
741 version
= msg
->vers_diag
>> VERS_SHIFT
;
743 log_msg(VLL_DBG
, msg
, "Received BFD control message", bfd
);
745 if (version
!= BFD_VERSION
) {
746 log_msg(VLL_WARN
, msg
, "Incorrect version", bfd
);
750 /* Technically this should happen after the length check. We don't support
751 * authentication however, so it's simpler to do the check first. */
752 if (flags
& FLAG_AUTH
) {
753 log_msg(VLL_WARN
, msg
, "Authenticated control message with"
754 " authentication disabled", bfd
);
758 if (msg
->length
!= BFD_PACKET_LEN
) {
759 log_msg(VLL_WARN
, msg
, "Unexpected length", bfd
);
760 if (msg
->length
< BFD_PACKET_LEN
) {
766 log_msg(VLL_WARN
, msg
, "Zero multiplier", bfd
);
770 if (flags
& FLAG_MULTIPOINT
) {
771 log_msg(VLL_WARN
, msg
, "Unsupported multipoint flag", bfd
);
776 log_msg(VLL_WARN
, msg
, "NULL my_disc", bfd
);
780 pkt_your_disc
= ntohl(msg
->your_disc
);
782 /* Technically, we should use the your discriminator field to figure
783 * out which 'struct bfd' this packet is destined towards. That way a
784 * bfd session could migrate from one interface to another
785 * transparently. This doesn't fit in with the OVS structure very
786 * well, so in this respect, we are not compliant. */
787 if (pkt_your_disc
!= bfd
->disc
) {
788 log_msg(VLL_WARN
, msg
, "Incorrect your_disc", bfd
);
791 } else if (rmt_state
> STATE_DOWN
) {
792 log_msg(VLL_WARN
, msg
, "Null your_disc", bfd
);
796 if (bfd
->rmt_state
!= rmt_state
) {
797 bfd_status_changed(bfd
);
800 bfd
->rmt_disc
= ntohl(msg
->my_disc
);
801 bfd
->rmt_state
= rmt_state
;
802 bfd
->rmt_flags
= flags
;
803 bfd
->rmt_diag
= msg
->vers_diag
& DIAG_MASK
;
805 if (flags
& FLAG_FINAL
&& bfd_in_poll(bfd
)) {
806 bfd
->min_tx
= bfd
->poll_min_tx
;
807 bfd
->min_rx
= bfd
->poll_min_rx
;
808 bfd
->flags
&= ~FLAG_POLL
;
809 log_msg(VLL_INFO
, msg
, "Poll sequence terminated", bfd
);
812 if (flags
& FLAG_POLL
) {
813 /* RFC 5880 Section 6.5
814 * When the other system receives a Poll, it immediately transmits a
815 * BFD Control packet with the Final (F) bit set, independent of any
816 * periodic BFD Control packets it may be sending
817 * (see section 6.8.7). */
818 bfd
->flags
&= ~FLAG_POLL
;
819 bfd
->flags
|= FLAG_FINAL
;
822 if (bfd
->rmt_mult
!= msg
->mult
) {
823 VLOG_INFO("Interface %s remote mult value %d changed to %d",
824 bfd
->name
, bfd
->rmt_mult
, msg
->mult
);
825 bfd
->rmt_mult
= msg
->mult
;
828 rmt_min_rx
= MAX(ntohl(msg
->min_rx
) / 1000, 1);
829 if (bfd
->rmt_min_rx
!= rmt_min_rx
) {
830 bfd
->rmt_min_rx
= rmt_min_rx
;
832 bfd_set_next_tx(bfd
);
834 log_msg(VLL_INFO
, msg
, "New remote min_rx", bfd
);
837 bfd
->rmt_min_tx
= MAX(ntohl(msg
->min_tx
) / 1000, 1);
838 bfd
->detect_time
= bfd_rx_interval(bfd
) * bfd
->rmt_mult
+ time_msec();
840 if (bfd
->state
== STATE_ADMIN_DOWN
) {
841 VLOG_DBG_RL(&rl
, "Administratively down, dropping control message.");
845 if (rmt_state
== STATE_ADMIN_DOWN
) {
846 if (bfd
->state
!= STATE_DOWN
) {
847 bfd_set_state(bfd
, STATE_DOWN
, DIAG_RMT_DOWN
);
850 switch (bfd
->state
) {
852 if (rmt_state
== STATE_DOWN
) {
853 bfd_set_state(bfd
, STATE_INIT
, bfd
->diag
);
854 } else if (rmt_state
== STATE_INIT
) {
855 bfd_set_state(bfd
, STATE_UP
, bfd
->diag
);
859 if (rmt_state
> STATE_DOWN
) {
860 bfd_set_state(bfd
, STATE_UP
, bfd
->diag
);
864 if (rmt_state
<= STATE_DOWN
) {
865 bfd_set_state(bfd
, STATE_DOWN
, DIAG_RMT_DOWN
);
866 log_msg(VLL_INFO
, msg
, "Remote signaled STATE_DOWN", bfd
);
869 case STATE_ADMIN_DOWN
:
874 /* XXX: RFC 5880 Section 6.8.6 Demand mode related calculations here. */
876 if (bfd
->forwarding_if_rx
) {
877 bfd
->demand_rx_bfd_time
= time_msec() + 100 * bfd
->cfg_min_rx
;
881 bfd_forwarding__(bfd
);
882 ovs_mutex_unlock(&mutex
);
885 /* Must be called when the netdev owned by 'bfd' should change. */
887 bfd_set_netdev(struct bfd
*bfd
, const struct netdev
*netdev
)
890 ovs_mutex_lock(&mutex
);
891 if (bfd
->netdev
!= netdev
) {
892 netdev_close(bfd
->netdev
);
893 bfd
->netdev
= netdev_ref(netdev
);
894 if (bfd
->decay_min_rx
&& bfd
->state
== STATE_UP
) {
895 bfd_decay_update(bfd
);
897 if (bfd
->forwarding_if_rx
&& bfd
->state
== STATE_UP
) {
898 bfd_forwarding_if_rx_update(bfd
);
900 bfd
->rx_packets
= bfd_rx_packets(bfd
);
902 ovs_mutex_unlock(&mutex
);
906 /* Updates the forwarding flag. If override is not configured and
907 * the forwarding flag value changes, increments the flap count.
909 * Note this function may be called multiple times in a function
910 * (e.g. bfd_account_rx) before and after the bfd state or status
911 * change. This is to capture any forwarding flag flap. */
913 bfd_forwarding__(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
915 long long int now
= time_msec();
916 bool forwarding_if_rx
;
917 bool last_forwarding
= bfd
->last_forwarding
;
919 if (bfd
->forwarding_override
!= -1) {
920 return bfd
->forwarding_override
== 1;
923 forwarding_if_rx
= bfd
->forwarding_if_rx
924 && bfd
->forwarding_if_rx_detect_time
> now
925 && bfd
->demand_rx_bfd_time
> now
;
927 bfd
->last_forwarding
= (bfd
->state
== STATE_UP
|| forwarding_if_rx
)
928 && bfd
->rmt_diag
!= DIAG_PATH_DOWN
929 && bfd
->rmt_diag
!= DIAG_CPATH_DOWN
930 && bfd
->rmt_diag
!= DIAG_RCPATH_DOWN
;
931 if (bfd
->last_forwarding
!= last_forwarding
) {
933 bfd_status_changed(bfd
);
935 return bfd
->last_forwarding
;
940 bfd_lookup_ip(const char *host_name
, ovs_be32 def
, ovs_be32
*addr
)
943 if (ip_parse(host_name
, addr
)) {
946 VLOG_ERR_RL(&rl
, "\"%s\" is not a valid IP address", host_name
);
952 bfd_in_poll(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
954 return (bfd
->flags
& FLAG_POLL
) != 0;
958 bfd_poll(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
960 if (bfd
->state
> STATE_DOWN
&& !bfd_in_poll(bfd
)
961 && !(bfd
->flags
& FLAG_FINAL
)) {
962 bfd
->poll_min_tx
= bfd
->cfg_min_tx
;
963 bfd
->poll_min_rx
= bfd
->in_decay
? bfd
->decay_min_rx
: bfd
->cfg_min_rx
;
964 bfd
->flags
|= FLAG_POLL
;
966 VLOG_INFO_RL(&rl
, "%s: Initiating poll sequence", bfd
->name
);
971 bfd_min_tx(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
973 /* RFC 5880 Section 6.8.3
974 * When bfd.SessionState is not Up, the system MUST set
975 * bfd.DesiredMinTxInterval to a value of not less than one second
976 * (1,000,000 microseconds). This is intended to ensure that the
977 * bandwidth consumed by BFD sessions that are not Up is negligible,
978 * particularly in the case where a neighbor may not be running BFD. */
979 return (bfd
->state
== STATE_UP
? bfd
->min_tx
: MAX(bfd
->min_tx
, 1000));
983 bfd_tx_interval(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
985 long long int interval
= bfd_min_tx(bfd
);
986 return MAX(interval
, bfd
->rmt_min_rx
);
990 bfd_rx_interval(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
992 return MAX(bfd
->min_rx
, bfd
->rmt_min_tx
);
996 bfd_set_next_tx(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
998 long long int interval
= bfd_tx_interval(bfd
);
999 if (bfd
->mult
== 1) {
1000 interval
-= interval
* (10 + random_range(16)) / 100;
1002 interval
-= interval
* random_range(26) / 100;
1004 bfd
->next_tx
= bfd
->last_tx
+ interval
;
1008 bfd_flag_str(enum flags flags
)
1010 struct ds ds
= DS_EMPTY_INITIALIZER
;
1011 static char flag_str
[128];
1017 if (flags
& FLAG_MULTIPOINT
) {
1018 ds_put_cstr(&ds
, "multipoint ");
1021 if (flags
& FLAG_DEMAND
) {
1022 ds_put_cstr(&ds
, "demand ");
1025 if (flags
& FLAG_AUTH
) {
1026 ds_put_cstr(&ds
, "auth ");
1029 if (flags
& FLAG_CTL
) {
1030 ds_put_cstr(&ds
, "ctl ");
1033 if (flags
& FLAG_FINAL
) {
1034 ds_put_cstr(&ds
, "final ");
1037 if (flags
& FLAG_POLL
) {
1038 ds_put_cstr(&ds
, "poll ");
1041 /* Do not copy the trailing whitespace. */
1043 ovs_strlcpy(flag_str
, ds_cstr(&ds
), sizeof flag_str
);
1049 bfd_state_str(enum state state
)
1052 case STATE_ADMIN_DOWN
: return "admin_down";
1053 case STATE_DOWN
: return "down";
1054 case STATE_INIT
: return "init";
1055 case STATE_UP
: return "up";
1056 default: return "invalid";
1061 bfd_diag_str(enum diag diag
) {
1063 case DIAG_NONE
: return "No Diagnostic";
1064 case DIAG_EXPIRED
: return "Control Detection Time Expired";
1065 case DIAG_ECHO_FAILED
: return "Echo Function Failed";
1066 case DIAG_RMT_DOWN
: return "Neighbor Signaled Session Down";
1067 case DIAG_FWD_RESET
: return "Forwarding Plane Reset";
1068 case DIAG_PATH_DOWN
: return "Path Down";
1069 case DIAG_CPATH_DOWN
: return "Concatenated Path Down";
1070 case DIAG_ADMIN_DOWN
: return "Administratively Down";
1071 case DIAG_RCPATH_DOWN
: return "Reverse Concatenated Path Down";
1072 default: return "Invalid Diagnostic";
1077 log_msg(enum vlog_level level
, const struct msg
*p
, const char *message
,
1078 const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1080 struct ds ds
= DS_EMPTY_INITIALIZER
;
1082 if (vlog_should_drop(&this_module
, level
, &rl
)) {
1088 "\n vers:%d diag:\"%s\" state:%s mult:%"PRIu8
1091 "\n my_disc:0x%"PRIx32
" your_disc:0x%"PRIx32
1092 "\n min_tx:%"PRIu32
"us (%"PRIu32
"ms)"
1093 "\n min_rx:%"PRIu32
"us (%"PRIu32
"ms)"
1094 "\n min_rx_echo:%"PRIu32
"us (%"PRIu32
"ms)",
1095 bfd
->name
, message
, p
->vers_diag
>> VERS_SHIFT
,
1096 bfd_diag_str(p
->vers_diag
& DIAG_MASK
),
1097 bfd_state_str(p
->flags
& STATE_MASK
),
1098 p
->mult
, p
->length
, bfd_flag_str(p
->flags
& FLAGS_MASK
),
1099 ntohl(p
->my_disc
), ntohl(p
->your_disc
),
1100 ntohl(p
->min_tx
), ntohl(p
->min_tx
) / 1000,
1101 ntohl(p
->min_rx
), ntohl(p
->min_rx
) / 1000,
1102 ntohl(p
->min_rx_echo
), ntohl(p
->min_rx_echo
) / 1000);
1103 bfd_put_details(&ds
, bfd
);
1104 VLOG(level
, "%s", ds_cstr(&ds
));
1109 bfd_set_state(struct bfd
*bfd
, enum state state
, enum diag diag
)
1112 if (bfd
->cpath_down
) {
1113 diag
= DIAG_CPATH_DOWN
;
1116 if (bfd
->state
!= state
|| bfd
->diag
!= diag
) {
1117 if (!VLOG_DROP_INFO(&rl
)) {
1118 struct ds ds
= DS_EMPTY_INITIALIZER
;
1120 ds_put_format(&ds
, "%s: BFD state change: %s->%s"
1121 " \"%s\"->\"%s\".\n",
1122 bfd
->name
, bfd_state_str(bfd
->state
),
1123 bfd_state_str(state
), bfd_diag_str(bfd
->diag
),
1124 bfd_diag_str(diag
));
1125 bfd_put_details(&ds
, bfd
);
1126 VLOG_INFO("%s", ds_cstr(&ds
));
1133 if (bfd
->state
<= STATE_DOWN
) {
1134 bfd
->rmt_state
= STATE_DOWN
;
1135 bfd
->rmt_diag
= DIAG_NONE
;
1136 bfd
->rmt_min_rx
= 1;
1139 bfd
->rmt_min_tx
= 0;
1140 /* Resets the min_rx if in_decay. */
1141 if (bfd
->in_decay
) {
1142 bfd
->min_rx
= bfd
->cfg_min_rx
;
1143 bfd
->in_decay
= false;
1146 /* Resets the decay when state changes to STATE_UP
1147 * and decay_min_rx is configured. */
1148 if (bfd
->state
== STATE_UP
&& bfd
->decay_min_rx
) {
1149 bfd_decay_update(bfd
);
1152 bfd_status_changed(bfd
);
1157 bfd_rx_packets(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1159 struct netdev_stats stats
;
1161 if (!netdev_get_stats(bfd
->netdev
, &stats
)) {
1162 return stats
.rx_packets
;
1168 /* Decays the bfd->min_rx to bfd->decay_min_rx when 'diff' is less than
1169 * the 'expect' value. */
1171 bfd_try_decay(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1173 int64_t diff
, expect
;
1175 /* The 'diff' is the difference between current interface rx_packets
1176 * stats and last-time check. The 'expect' is the recorded number of
1177 * bfd control packets received within an approximately decay_min_rx
1178 * (2000 ms if decay_min_rx is less than 2000 ms) interval.
1180 * Since the update of rx_packets stats at interface happens
1181 * asynchronously to the bfd_rx_packets() function, the 'diff' value
1182 * can be jittered. Thusly, we double the decay_rx_ctl to provide
1183 * more wiggle room. */
1184 diff
= bfd_rx_packets(bfd
) - bfd
->decay_rx_packets
;
1185 expect
= 2 * MAX(bfd
->decay_rx_ctl
, 1);
1186 bfd
->in_decay
= diff
<= expect
? true : false;
1187 bfd_decay_update(bfd
);
1190 /* Updates the rx_packets, decay_rx_ctl and decay_detect_time. */
1192 bfd_decay_update(struct bfd
* bfd
) OVS_REQUIRES(mutex
)
1194 bfd
->decay_rx_packets
= bfd_rx_packets(bfd
);
1195 bfd
->decay_rx_ctl
= 0;
1196 bfd
->decay_detect_time
= MAX(bfd
->decay_min_rx
, 2000) + time_msec();
1199 /* Records the status change and changes the global connectivity seq. */
1201 bfd_status_changed(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1203 seq_change(connectivity_seq_get());
1204 bfd
->status_changed
= true;
1208 bfd_forwarding_if_rx_update(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1210 int64_t incr
= bfd_rx_interval(bfd
) * bfd
->mult
;
1211 bfd
->forwarding_if_rx_detect_time
= MAX(incr
, 2000) + time_msec();
1215 generate_discriminator(void)
1219 /* RFC 5880 Section 6.8.1
1220 * It SHOULD be set to a random (but still unique) value to improve
1221 * security. The value is otherwise outside the scope of this
1227 /* 'disc' is by definition random, so there's no reason to waste time
1229 disc
= random_uint32();
1230 HMAP_FOR_EACH_IN_BUCKET (bfd
, node
, disc
, all_bfds
) {
1231 if (bfd
->disc
== disc
) {
1242 bfd_find_by_name(const char *name
) OVS_REQUIRES(mutex
)
1246 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1247 if (!strcmp(bfd
->name
, name
)) {
1255 bfd_put_details(struct ds
*ds
, const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1257 ds_put_format(ds
, " Forwarding: %s\n",
1258 bfd_forwarding__(CONST_CAST(struct bfd
*, bfd
))
1259 ? "true" : "false");
1260 ds_put_format(ds
, " Detect Multiplier: %d\n", bfd
->mult
);
1261 ds_put_format(ds
, " Concatenated Path Down: %s\n",
1262 bfd
->cpath_down
? "true" : "false");
1263 ds_put_format(ds
, " TX Interval: Approx %lldms\n", bfd_tx_interval(bfd
));
1264 ds_put_format(ds
, " RX Interval: Approx %lldms\n", bfd_rx_interval(bfd
));
1265 ds_put_format(ds
, " Detect Time: now %+lldms\n",
1266 bfd
->detect_time
- time_msec());
1267 ds_put_format(ds
, " Next TX Time: now %+lldms\n",
1268 bfd
->next_tx
-time_msec());
1269 ds_put_format(ds
, " Last TX Time: now %+lldms\n",
1270 bfd
->last_tx
- time_msec());
1272 ds_put_cstr(ds
, "\n");
1274 ds_put_format(ds
, " Local Flags: %s\n", bfd_flag_str(bfd
->flags
));
1275 ds_put_format(ds
, " Local Session State: %s\n",
1276 bfd_state_str(bfd
->state
));
1277 ds_put_format(ds
, " Local Diagnostic: %s\n", bfd_diag_str(bfd
->diag
));
1278 ds_put_format(ds
, " Local Discriminator: 0x%"PRIx32
"\n", bfd
->disc
);
1279 ds_put_format(ds
, " Local Minimum TX Interval: %lldms\n",
1281 ds_put_format(ds
, " Local Minimum RX Interval: %lldms\n", bfd
->min_rx
);
1283 ds_put_cstr(ds
, "\n");
1285 ds_put_format(ds
, " Remote Flags: %s\n", bfd_flag_str(bfd
->rmt_flags
));
1286 ds_put_format(ds
, " Remote Session State: %s\n",
1287 bfd_state_str(bfd
->rmt_state
));
1288 ds_put_format(ds
, " Remote Diagnostic: %s\n",
1289 bfd_diag_str(bfd
->rmt_diag
));
1290 ds_put_format(ds
, " Remote Discriminator: 0x%"PRIx32
"\n", bfd
->rmt_disc
);
1291 ds_put_format(ds
, " Remote Minimum TX Interval: %lldms\n",
1293 ds_put_format(ds
, " Remote Minimum RX Interval: %lldms\n",
1295 ds_put_format(ds
, " Remote Detect Multiplier: %d\n", bfd
->rmt_mult
);
1299 bfd_unixctl_show(struct unixctl_conn
*conn
, int argc
, const char *argv
[],
1300 void *aux OVS_UNUSED
) OVS_EXCLUDED(mutex
)
1302 struct ds ds
= DS_EMPTY_INITIALIZER
;
1305 ovs_mutex_lock(&mutex
);
1307 bfd
= bfd_find_by_name(argv
[1]);
1309 unixctl_command_reply_error(conn
, "no such bfd object");
1312 bfd_put_details(&ds
, bfd
);
1314 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1315 ds_put_format(&ds
, "---- %s ----\n", bfd
->name
);
1316 bfd_put_details(&ds
, bfd
);
1319 unixctl_command_reply(conn
, ds_cstr(&ds
));
1323 ovs_mutex_unlock(&mutex
);
1328 bfd_unixctl_set_forwarding_override(struct unixctl_conn
*conn
, int argc
,
1329 const char *argv
[], void *aux OVS_UNUSED
)
1332 const char *forward_str
= argv
[argc
- 1];
1333 int forwarding_override
;
1336 ovs_mutex_lock(&mutex
);
1337 if (!strcasecmp("true", forward_str
)) {
1338 forwarding_override
= 1;
1339 } else if (!strcasecmp("false", forward_str
)) {
1340 forwarding_override
= 0;
1341 } else if (!strcasecmp("normal", forward_str
)) {
1342 forwarding_override
= -1;
1344 unixctl_command_reply_error(conn
, "unknown fault string");
1349 bfd
= bfd_find_by_name(argv
[1]);
1351 unixctl_command_reply_error(conn
, "no such BFD object");
1354 bfd
->forwarding_override
= forwarding_override
;
1355 bfd_status_changed(bfd
);
1357 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1358 bfd
->forwarding_override
= forwarding_override
;
1359 bfd_status_changed(bfd
);
1363 unixctl_command_reply(conn
, "OK");
1366 ovs_mutex_unlock(&mutex
);