1 /* Copyright (c) 2013, 2014 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 <arpa/inet.h>
20 #include <netinet/in_systm.h>
21 #include <netinet/ip.h>
22 #include <sys/socket.h>
24 #include "byte-order.h"
25 #include "connectivity.h"
27 #include "dp-packet.h"
29 #include "dynamic-string.h"
37 #include "ovs-thread.h"
38 #include "openvswitch/types.h"
40 #include "poll-loop.h"
45 #include "unaligned.h"
48 #include "openvswitch/vlog.h"
50 VLOG_DEFINE_THIS_MODULE(bfd
);
54 * The goal of this module is to replace CFM with something both more flexible
55 * and standards compliant. In service of this goal, the following needs to be
59 * * Implement Demand mode.
60 * * Go through the RFC line by line and verify we comply.
61 * * Test against a hardware implementation. Preferably a popular one.
62 * * Delete BFD packets with nw_ttl != 255 in the datapath to prevent DOS
67 * - Set TOS/PCP on the outer tunnel header when encapped.
69 * - Sending BFD messages should be in its own thread/process.
71 * - Scale testing. How does it operate when there are large number of bfd
72 * sessions? Do we ever have random flaps? What's the CPU utilization?
74 * - Rely on data traffic for liveness by using BFD demand mode.
75 * If we're receiving traffic on a port, we can safely assume it's up (modulo
76 * unidrectional failures). BFD has a demand mode in which it can stay quiet
77 * unless it feels the need to check the status of the port. Using this, we
78 * can implement a strategy in which BFD only sends control messages on dark
81 * - Depending on how one interprets the spec, it appears that a BFD session
82 * can never change bfd.LocalDiag to "No Diagnostic". We should verify that
83 * this is what hardware implementations actually do. Seems like "No
84 * Diagnostic" should be set once a BFD session state goes UP. */
89 FLAG_MULTIPOINT
= 1 << 0,
98 STATE_ADMIN_DOWN
= 0 << 6,
105 DIAG_NONE
= 0, /* No Diagnostic. */
106 DIAG_EXPIRED
= 1, /* Control Detection Time Expired. */
107 DIAG_ECHO_FAILED
= 2, /* Echo Function Failed. */
108 DIAG_RMT_DOWN
= 3, /* Neighbor Signaled Session Down. */
109 DIAG_FWD_RESET
= 4, /* Forwarding Plane Reset. */
110 DIAG_PATH_DOWN
= 5, /* Path Down. */
111 DIAG_CPATH_DOWN
= 6, /* Concatenated Path Down. */
112 DIAG_ADMIN_DOWN
= 7, /* Administratively Down. */
113 DIAG_RCPATH_DOWN
= 8 /* Reverse Concatenated Path Down. */
116 /* RFC 5880 Section 4.1
118 * 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
119 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
120 * |Vers | Diag |Sta|P|F|C|A|D|M| Detect Mult | Length |
121 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
122 * | My Discriminator |
123 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
124 * | Your Discriminator |
125 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
126 * | Desired Min TX Interval |
127 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
128 * | Required Min RX Interval |
129 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
130 * | Required Min Echo RX Interval |
131 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
133 uint8_t vers_diag
; /* Version and diagnostic. */
134 uint8_t flags
; /* 2bit State field followed by flags. */
135 uint8_t mult
; /* Fault detection multiplier. */
136 uint8_t length
; /* Length of this BFD message. */
137 ovs_be32 my_disc
; /* My discriminator. */
138 ovs_be32 your_disc
; /* Your discriminator. */
139 ovs_be32 min_tx
; /* Desired minimum tx interval. */
140 ovs_be32 min_rx
; /* Required minimum rx interval. */
141 ovs_be32 min_rx_echo
; /* Required minimum echo rx interval. */
143 BUILD_ASSERT_DECL(BFD_PACKET_LEN
== sizeof(struct msg
));
145 #define DIAG_MASK 0x1f
147 #define STATE_MASK 0xC0
148 #define FLAGS_MASK 0x3f
151 struct hmap_node node
; /* In 'all_bfds'. */
152 uint32_t disc
; /* bfd.LocalDiscr. Key in 'all_bfds' hmap. */
154 char *name
; /* Name used for logging. */
156 bool cpath_down
; /* Concatenated Path Down. */
157 uint8_t mult
; /* bfd.DetectMult. */
159 struct netdev
*netdev
;
160 uint64_t rx_packets
; /* Packets received by 'netdev'. */
162 enum state state
; /* bfd.SessionState. */
163 enum state rmt_state
; /* bfd.RemoteSessionState. */
165 enum diag diag
; /* bfd.LocalDiag. */
166 enum diag rmt_diag
; /* Remote diagnostic. */
168 enum flags flags
; /* Flags sent on messages. */
169 enum flags rmt_flags
; /* Flags last received. */
171 uint32_t rmt_disc
; /* bfd.RemoteDiscr. */
173 struct eth_addr local_eth_src
; /* Local eth src address. */
174 struct eth_addr local_eth_dst
; /* Local eth dst address. */
176 struct eth_addr rmt_eth_dst
; /* Remote eth dst address. */
178 ovs_be32 ip_src
; /* IPv4 source address. */
179 ovs_be32 ip_dst
; /* IPv4 destination address. */
181 uint16_t udp_src
; /* UDP source port. */
183 /* All timers in milliseconds. */
184 long long int rmt_min_rx
; /* bfd.RemoteMinRxInterval. */
185 long long int rmt_min_tx
; /* Remote minimum TX interval. */
187 long long int cfg_min_tx
; /* Configured minimum TX rate. */
188 long long int cfg_min_rx
; /* Configured required minimum RX rate. */
189 long long int poll_min_tx
; /* Min TX negotating in a poll sequence. */
190 long long int poll_min_rx
; /* Min RX negotating in a poll sequence. */
191 long long int min_tx
; /* bfd.DesiredMinTxInterval. */
192 long long int min_rx
; /* bfd.RequiredMinRxInterval. */
194 long long int last_tx
; /* Last TX time. */
195 long long int next_tx
; /* Next TX time. */
196 long long int detect_time
; /* RFC 5880 6.8.4 Detection time. */
198 bool last_forwarding
; /* Last calculation of forwarding flag. */
199 int forwarding_override
; /* Manual override of 'forwarding' status. */
201 atomic_bool check_tnl_key
; /* Verify tunnel key of inbound packets? */
202 struct ovs_refcount ref_cnt
;
204 /* When forward_if_rx is true, bfd_forwarding() will return
205 * true as long as there are incoming packets received.
206 * Note, forwarding_override still has higher priority. */
207 bool forwarding_if_rx
;
208 long long int forwarding_if_rx_detect_time
;
210 /* When 'bfd->forwarding_if_rx' is set, at least one bfd control packet
211 * is required to be received every 100 * bfd->cfg_min_rx. If bfd
212 * control packet is not received within this interval, even if data
213 * packets are received, the bfd->forwarding will still be false. */
214 long long int demand_rx_bfd_time
;
216 /* BFD decay related variables. */
217 bool in_decay
; /* True when bfd is in decay. */
218 int decay_min_rx
; /* min_rx is set to decay_min_rx when */
220 int decay_rx_ctl
; /* Count bfd packets received within decay */
221 /* detect interval. */
222 uint64_t decay_rx_packets
; /* Packets received by 'netdev'. */
223 long long int decay_detect_time
; /* Decay detection time. */
225 uint64_t flap_count
; /* Counts bfd forwarding flaps. */
227 /* True when the variables returned by bfd_get_status() are changed
228 * since last check. */
232 static struct ovs_mutex mutex
= OVS_MUTEX_INITIALIZER
;
233 static struct hmap all_bfds__
= HMAP_INITIALIZER(&all_bfds__
);
234 static struct hmap
*const all_bfds
OVS_GUARDED_BY(mutex
) = &all_bfds__
;
236 static bool bfd_lookup_ip(const char *host_name
, struct in_addr
*)
238 static bool bfd_forwarding__(struct bfd
*) OVS_REQUIRES(mutex
);
239 static bool bfd_in_poll(const struct bfd
*) OVS_REQUIRES(mutex
);
240 static void bfd_poll(struct bfd
*bfd
) OVS_REQUIRES(mutex
);
241 static const char *bfd_diag_str(enum diag
) OVS_REQUIRES(mutex
);
242 static const char *bfd_state_str(enum state
) OVS_REQUIRES(mutex
);
243 static long long int bfd_min_tx(const struct bfd
*) OVS_REQUIRES(mutex
);
244 static long long int bfd_tx_interval(const struct bfd
*)
246 static long long int bfd_rx_interval(const struct bfd
*)
248 static void bfd_set_next_tx(struct bfd
*) OVS_REQUIRES(mutex
);
249 static void bfd_set_state(struct bfd
*, enum state
, enum diag
)
251 static uint32_t generate_discriminator(void) OVS_REQUIRES(mutex
);
252 static void bfd_put_details(struct ds
*, const struct bfd
*)
254 static uint64_t bfd_rx_packets(const struct bfd
*) OVS_REQUIRES(mutex
);
255 static void bfd_try_decay(struct bfd
*) OVS_REQUIRES(mutex
);
256 static void bfd_decay_update(struct bfd
*) OVS_REQUIRES(mutex
);
257 static void bfd_status_changed(struct bfd
*) OVS_REQUIRES(mutex
);
259 static void bfd_forwarding_if_rx_update(struct bfd
*) OVS_REQUIRES(mutex
);
260 static void bfd_unixctl_show(struct unixctl_conn
*, int argc
,
261 const char *argv
[], void *aux OVS_UNUSED
);
262 static void bfd_unixctl_set_forwarding_override(struct unixctl_conn
*,
263 int argc
, const char *argv
[],
264 void *aux OVS_UNUSED
);
265 static void log_msg(enum vlog_level
, const struct msg
*, const char *message
,
266 const struct bfd
*) OVS_REQUIRES(mutex
);
268 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(20, 20);
270 /* Returns true if the interface on which 'bfd' is running may be used to
271 * forward traffic according to the BFD session state. */
273 bfd_forwarding(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
277 ovs_mutex_lock(&mutex
);
278 ret
= bfd_forwarding__(bfd
);
279 ovs_mutex_unlock(&mutex
);
283 /* When forwarding_if_rx is enabled, if there are packets received,
284 * updates forwarding_if_rx_detect_time. */
286 bfd_account_rx(struct bfd
*bfd
, const struct dpif_flow_stats
*stats
)
288 if (stats
->n_packets
&& bfd
->forwarding_if_rx
) {
289 ovs_mutex_lock(&mutex
);
290 bfd_forwarding__(bfd
);
291 bfd_forwarding_if_rx_update(bfd
);
292 bfd_forwarding__(bfd
);
293 ovs_mutex_unlock(&mutex
);
297 /* Returns and resets the 'bfd->status_changed'. */
299 bfd_check_status_change(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
303 ovs_mutex_lock(&mutex
);
304 ret
= bfd
->status_changed
;
305 bfd
->status_changed
= false;
306 ovs_mutex_unlock(&mutex
);
311 /* Returns a 'smap' of key value pairs representing the status of 'bfd'
312 * intended for the OVS database. */
314 bfd_get_status(const struct bfd
*bfd
, struct smap
*smap
)
317 ovs_mutex_lock(&mutex
);
318 smap_add(smap
, "forwarding",
319 bfd_forwarding__(CONST_CAST(struct bfd
*, bfd
))
321 smap_add(smap
, "state", bfd_state_str(bfd
->state
));
322 smap_add(smap
, "diagnostic", bfd_diag_str(bfd
->diag
));
323 smap_add_format(smap
, "flap_count", "%"PRIu64
, bfd
->flap_count
);
325 if (bfd
->state
!= STATE_DOWN
) {
326 smap_add(smap
, "remote_state", bfd_state_str(bfd
->rmt_state
));
327 smap_add(smap
, "remote_diagnostic", bfd_diag_str(bfd
->rmt_diag
));
329 ovs_mutex_unlock(&mutex
);
335 unixctl_command_register("bfd/show", "[interface]", 0, 1,
336 bfd_unixctl_show
, NULL
);
337 unixctl_command_register("bfd/set-forwarding",
338 "[interface] normal|false|true", 1, 2,
339 bfd_unixctl_set_forwarding_override
, NULL
);
342 /* Initializes, destroys, or reconfigures the BFD session 'bfd' (named 'name'),
343 * according to the database configuration contained in 'cfg'. Takes ownership
344 * of 'bfd', which may be NULL. Returns a BFD object which may be used as a
345 * handle for the session, or NULL if BFD is not enabled according to 'cfg'.
346 * Also returns NULL if cfg is NULL. */
348 bfd_configure(struct bfd
*bfd
, const char *name
, const struct smap
*cfg
,
349 struct netdev
*netdev
) OVS_EXCLUDED(mutex
)
351 static atomic_count udp_src
= ATOMIC_COUNT_INIT(0);
354 long long int min_tx
, min_rx
;
355 bool need_poll
= false;
356 bool cfg_min_rx_changed
= false;
357 bool cpath_down
, forwarding_if_rx
;
358 const char *hwaddr
, *ip_src
, *ip_dst
;
359 struct in_addr in_addr
;
362 if (!cfg
|| !smap_get_bool(cfg
, "enable", false)) {
367 ovs_mutex_lock(&mutex
);
369 bfd
= xzalloc(sizeof *bfd
);
370 bfd
->name
= xstrdup(name
);
371 bfd
->forwarding_override
= -1;
372 bfd
->disc
= generate_discriminator();
373 hmap_insert(all_bfds
, &bfd
->node
, bfd
->disc
);
375 bfd
->diag
= DIAG_NONE
;
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 atomic_store_relaxed(&bfd
->check_tnl_key
,
397 smap_get_bool(cfg
, "check_tnl_key", false));
398 min_tx
= smap_get_int(cfg
, "min_tx", 100);
399 min_tx
= MAX(min_tx
, 1);
400 if (bfd
->cfg_min_tx
!= min_tx
) {
401 bfd
->cfg_min_tx
= min_tx
;
402 if (bfd
->state
!= STATE_UP
403 || (!bfd_in_poll(bfd
) && bfd
->cfg_min_tx
< bfd
->min_tx
)) {
404 bfd
->min_tx
= bfd
->cfg_min_tx
;
409 min_rx
= smap_get_int(cfg
, "min_rx", 1000);
410 min_rx
= MAX(min_rx
, 1);
411 if (bfd
->cfg_min_rx
!= min_rx
) {
412 bfd
->cfg_min_rx
= min_rx
;
413 if (bfd
->state
!= STATE_UP
414 || (!bfd_in_poll(bfd
) && bfd
->cfg_min_rx
> bfd
->min_rx
)) {
415 bfd
->min_rx
= bfd
->cfg_min_rx
;
417 cfg_min_rx_changed
= true;
421 decay_min_rx
= smap_get_int(cfg
, "decay_min_rx", 0);
422 if (bfd
->decay_min_rx
!= decay_min_rx
|| cfg_min_rx_changed
) {
423 if (decay_min_rx
> 0 && decay_min_rx
< bfd
->cfg_min_rx
) {
424 VLOG_WARN("%s: decay_min_rx cannot be less than %lld ms",
425 bfd
->name
, bfd
->cfg_min_rx
);
426 bfd
->decay_min_rx
= 0;
428 bfd
->decay_min_rx
= decay_min_rx
;
431 bfd
->in_decay
= false;
432 bfd_decay_update(bfd
);
436 cpath_down
= smap_get_bool(cfg
, "cpath_down", false);
437 if (bfd
->cpath_down
!= cpath_down
) {
438 bfd
->cpath_down
= cpath_down
;
439 bfd_set_state(bfd
, bfd
->state
, DIAG_NONE
);
443 hwaddr
= smap_get(cfg
, "bfd_local_src_mac");
444 if (hwaddr
&& eth_addr_from_string(hwaddr
, &ea
)) {
445 bfd
->local_eth_src
= ea
;
447 bfd
->local_eth_src
= eth_addr_zero
;
450 hwaddr
= smap_get(cfg
, "bfd_local_dst_mac");
451 if (hwaddr
&& eth_addr_from_string(hwaddr
, &ea
)) {
452 bfd
->local_eth_dst
= ea
;
454 bfd
->local_eth_dst
= eth_addr_zero
;
457 hwaddr
= smap_get(cfg
, "bfd_remote_dst_mac");
458 if (hwaddr
&& eth_addr_from_string(hwaddr
, &ea
)) {
459 bfd
->rmt_eth_dst
= ea
;
461 bfd
->rmt_eth_dst
= eth_addr_zero
;
464 ip_src
= smap_get(cfg
, "bfd_src_ip");
465 if (ip_src
&& bfd_lookup_ip(ip_src
, &in_addr
)) {
466 memcpy(&bfd
->ip_src
, &in_addr
, sizeof in_addr
);
468 bfd
->ip_src
= htonl(0xA9FE0101); /* 169.254.1.1. */
471 ip_dst
= smap_get(cfg
, "bfd_dst_ip");
472 if (ip_dst
&& bfd_lookup_ip(ip_dst
, &in_addr
)) {
473 memcpy(&bfd
->ip_dst
, &in_addr
, sizeof in_addr
);
475 bfd
->ip_dst
= htonl(0xA9FE0100); /* 169.254.1.0. */
478 forwarding_if_rx
= smap_get_bool(cfg
, "forwarding_if_rx", false);
479 if (bfd
->forwarding_if_rx
!= forwarding_if_rx
) {
480 bfd
->forwarding_if_rx
= forwarding_if_rx
;
481 if (bfd
->state
== STATE_UP
&& bfd
->forwarding_if_rx
) {
482 bfd_forwarding_if_rx_update(bfd
);
484 bfd
->forwarding_if_rx_detect_time
= 0;
491 ovs_mutex_unlock(&mutex
);
496 bfd_ref(const struct bfd
*bfd_
)
498 struct bfd
*bfd
= CONST_CAST(struct bfd
*, bfd_
);
500 ovs_refcount_ref(&bfd
->ref_cnt
);
506 bfd_unref(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
508 if (bfd
&& ovs_refcount_unref_relaxed(&bfd
->ref_cnt
) == 1) {
509 ovs_mutex_lock(&mutex
);
510 bfd_status_changed(bfd
);
511 hmap_remove(all_bfds
, &bfd
->node
);
512 netdev_close(bfd
->netdev
);
515 ovs_mutex_unlock(&mutex
);
520 bfd_wait(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
522 long long int wake_time
= bfd_wake_time(bfd
);
523 poll_timer_wait_until(wake_time
);
527 /* Returns the next wake up time. */
529 bfd_wake_time(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
531 long long int retval
;
537 ovs_mutex_lock(&mutex
);
538 if (bfd
->flags
& FLAG_FINAL
) {
541 retval
= bfd
->next_tx
;
542 if (bfd
->state
> STATE_DOWN
) {
543 retval
= MIN(bfd
->detect_time
, retval
);
546 ovs_mutex_unlock(&mutex
);
551 bfd_run(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
556 ovs_mutex_lock(&mutex
);
558 old_in_decay
= bfd
->in_decay
;
560 if (bfd
->state
> STATE_DOWN
&& now
>= bfd
->detect_time
) {
561 bfd_set_state(bfd
, STATE_DOWN
, DIAG_EXPIRED
);
563 bfd_forwarding__(bfd
);
565 /* Decay may only happen when state is STATE_UP, bfd->decay_min_rx is
566 * configured, and decay_detect_time is reached. */
567 if (bfd
->state
== STATE_UP
&& bfd
->decay_min_rx
> 0
568 && now
>= bfd
->decay_detect_time
) {
572 if (bfd
->min_tx
!= bfd
->cfg_min_tx
573 || (bfd
->min_rx
!= bfd
->cfg_min_rx
&& bfd
->min_rx
!= bfd
->decay_min_rx
)
574 || bfd
->in_decay
!= old_in_decay
) {
577 ovs_mutex_unlock(&mutex
);
581 bfd_should_send_packet(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
584 ovs_mutex_lock(&mutex
);
585 ret
= bfd
->flags
& FLAG_FINAL
|| time_msec() >= bfd
->next_tx
;
586 ovs_mutex_unlock(&mutex
);
591 bfd_put_packet(struct bfd
*bfd
, struct dp_packet
*p
,
592 const struct eth_addr eth_src
) OVS_EXCLUDED(mutex
)
594 long long int min_tx
, min_rx
;
595 struct udp_header
*udp
;
596 struct eth_header
*eth
;
597 struct ip_header
*ip
;
600 ovs_mutex_lock(&mutex
);
602 long long int delay
= time_msec() - bfd
->next_tx
;
603 long long int interval
= bfd_tx_interval(bfd
);
604 if (delay
> interval
* 3 / 2) {
605 VLOG_INFO("%s: long delay of %lldms (expected %lldms) sending BFD"
606 " control message", bfd
->name
, delay
, interval
);
610 /* RFC 5880 Section 6.5
611 * A BFD Control packet MUST NOT have both the Poll (P) and Final (F) bits
613 ovs_assert(!(bfd
->flags
& FLAG_POLL
) || !(bfd
->flags
& FLAG_FINAL
));
615 dp_packet_reserve(p
, 2); /* Properly align after the ethernet header. */
616 eth
= dp_packet_put_uninit(p
, sizeof *eth
);
617 eth
->eth_src
= eth_addr_is_zero(bfd
->local_eth_src
)
618 ? eth_src
: bfd
->local_eth_src
;
619 eth
->eth_dst
= eth_addr_is_zero(bfd
->local_eth_dst
)
620 ? eth_addr_bfd
: bfd
->local_eth_dst
;
621 eth
->eth_type
= htons(ETH_TYPE_IP
);
623 ip
= dp_packet_put_zeros(p
, sizeof *ip
);
624 ip
->ip_ihl_ver
= IP_IHL_VER(5, 4);
625 ip
->ip_tot_len
= htons(sizeof *ip
+ sizeof *udp
+ sizeof *msg
);
627 ip
->ip_tos
= IPTOS_LOWDELAY
| IPTOS_THROUGHPUT
;
628 ip
->ip_proto
= IPPROTO_UDP
;
629 put_16aligned_be32(&ip
->ip_src
, bfd
->ip_src
);
630 put_16aligned_be32(&ip
->ip_dst
, bfd
->ip_dst
);
631 ip
->ip_csum
= csum(ip
, sizeof *ip
);
633 udp
= dp_packet_put_zeros(p
, sizeof *udp
);
634 udp
->udp_src
= htons(bfd
->udp_src
);
635 udp
->udp_dst
= htons(BFD_DEST_PORT
);
636 udp
->udp_len
= htons(sizeof *udp
+ sizeof *msg
);
638 msg
= dp_packet_put_uninit(p
, sizeof *msg
);
639 msg
->vers_diag
= (BFD_VERSION
<< 5) | bfd
->diag
;
640 msg
->flags
= (bfd
->state
& STATE_MASK
) | bfd
->flags
;
642 msg
->mult
= bfd
->mult
;
643 msg
->length
= BFD_PACKET_LEN
;
644 msg
->my_disc
= htonl(bfd
->disc
);
645 msg
->your_disc
= htonl(bfd
->rmt_disc
);
646 msg
->min_rx_echo
= htonl(0);
648 if (bfd_in_poll(bfd
)) {
649 min_tx
= bfd
->poll_min_tx
;
650 min_rx
= bfd
->poll_min_rx
;
652 min_tx
= bfd_min_tx(bfd
);
653 min_rx
= bfd
->min_rx
;
656 msg
->min_tx
= htonl(min_tx
* 1000);
657 msg
->min_rx
= htonl(min_rx
* 1000);
659 bfd
->flags
&= ~FLAG_FINAL
;
661 log_msg(VLL_DBG
, msg
, "Sending BFD Message", bfd
);
663 bfd
->last_tx
= time_msec();
664 bfd_set_next_tx(bfd
);
665 ovs_mutex_unlock(&mutex
);
669 bfd_should_process_flow(const struct bfd
*bfd_
, const struct flow
*flow
,
670 struct flow_wildcards
*wc
)
672 struct bfd
*bfd
= CONST_CAST(struct bfd
*, bfd_
);
674 if (!eth_addr_is_zero(bfd
->rmt_eth_dst
)) {
675 memset(&wc
->masks
.dl_dst
, 0xff, sizeof wc
->masks
.dl_dst
);
677 if (!eth_addr_equals(bfd
->rmt_eth_dst
, flow
->dl_dst
)) {
682 if (flow
->dl_type
== htons(ETH_TYPE_IP
)) {
683 memset(&wc
->masks
.nw_proto
, 0xff, sizeof wc
->masks
.nw_proto
);
684 if (flow
->nw_proto
== IPPROTO_UDP
) {
685 memset(&wc
->masks
.tp_dst
, 0xff, sizeof wc
->masks
.tp_dst
);
686 if (flow
->tp_dst
== htons(BFD_DEST_PORT
)) {
689 atomic_read_relaxed(&bfd
->check_tnl_key
, &check_tnl_key
);
691 memset(&wc
->masks
.tunnel
.tun_id
, 0xff,
692 sizeof wc
->masks
.tunnel
.tun_id
);
693 return flow
->tunnel
.tun_id
== htonll(0);
703 bfd_process_packet(struct bfd
*bfd
, const struct flow
*flow
,
704 const struct dp_packet
*p
) OVS_EXCLUDED(mutex
)
706 uint32_t rmt_min_rx
, pkt_your_disc
;
707 enum state rmt_state
;
711 const uint8_t *l7
= dp_packet_get_udp_payload(p
);
714 return; /* No UDP payload. */
717 /* This function is designed to follow section RFC 5880 6.8.6 closely. */
719 ovs_mutex_lock(&mutex
);
720 /* Increments the decay rx counter. */
723 bfd_forwarding__(bfd
);
725 if (flow
->nw_ttl
!= 255) {
726 /* XXX Should drop in the kernel to prevent DOS. */
730 msg
= dp_packet_at(p
, l7
- (uint8_t *)dp_packet_data(p
), BFD_PACKET_LEN
);
732 VLOG_INFO_RL(&rl
, "%s: Received too-short BFD control message (only "
733 "%"PRIdPTR
" bytes long, at least %d required).",
734 bfd
->name
, (uint8_t *) dp_packet_tail(p
) - l7
,
739 /* RFC 5880 Section 6.8.6
740 * If the Length field is greater than the payload of the encapsulating
741 * protocol, the packet MUST be discarded.
743 * Note that we make this check implicitly. Above we use dp_packet_at() to
744 * ensure that there are at least BFD_PACKET_LEN bytes in the payload of
745 * the encapsulating protocol. Below we require msg->length to be exactly
746 * BFD_PACKET_LEN bytes. */
748 flags
= msg
->flags
& FLAGS_MASK
;
749 rmt_state
= msg
->flags
& STATE_MASK
;
750 version
= msg
->vers_diag
>> VERS_SHIFT
;
752 log_msg(VLL_DBG
, msg
, "Received BFD control message", bfd
);
754 if (version
!= BFD_VERSION
) {
755 log_msg(VLL_WARN
, msg
, "Incorrect version", bfd
);
759 /* Technically this should happen after the length check. We don't support
760 * authentication however, so it's simpler to do the check first. */
761 if (flags
& FLAG_AUTH
) {
762 log_msg(VLL_WARN
, msg
, "Authenticated control message with"
763 " authentication disabled", bfd
);
767 if (msg
->length
!= BFD_PACKET_LEN
) {
768 log_msg(VLL_WARN
, msg
, "Unexpected length", bfd
);
769 if (msg
->length
< BFD_PACKET_LEN
) {
775 log_msg(VLL_WARN
, msg
, "Zero multiplier", bfd
);
779 if (flags
& FLAG_MULTIPOINT
) {
780 log_msg(VLL_WARN
, msg
, "Unsupported multipoint flag", bfd
);
785 log_msg(VLL_WARN
, msg
, "NULL my_disc", bfd
);
789 pkt_your_disc
= ntohl(msg
->your_disc
);
791 /* Technically, we should use the your discriminator field to figure
792 * out which 'struct bfd' this packet is destined towards. That way a
793 * bfd session could migrate from one interface to another
794 * transparently. This doesn't fit in with the OVS structure very
795 * well, so in this respect, we are not compliant. */
796 if (pkt_your_disc
!= bfd
->disc
) {
797 log_msg(VLL_WARN
, msg
, "Incorrect your_disc", bfd
);
800 } else if (rmt_state
> STATE_DOWN
) {
801 log_msg(VLL_WARN
, msg
, "Null your_disc", bfd
);
805 if (bfd
->rmt_state
!= rmt_state
) {
806 bfd_status_changed(bfd
);
809 bfd
->rmt_disc
= ntohl(msg
->my_disc
);
810 bfd
->rmt_state
= rmt_state
;
811 bfd
->rmt_flags
= flags
;
812 bfd
->rmt_diag
= msg
->vers_diag
& DIAG_MASK
;
814 if (flags
& FLAG_FINAL
&& bfd_in_poll(bfd
)) {
815 bfd
->min_tx
= bfd
->poll_min_tx
;
816 bfd
->min_rx
= bfd
->poll_min_rx
;
817 bfd
->flags
&= ~FLAG_POLL
;
818 log_msg(VLL_INFO
, msg
, "Poll sequence terminated", bfd
);
821 if (flags
& FLAG_POLL
) {
822 /* RFC 5880 Section 6.5
823 * When the other system receives a Poll, it immediately transmits a
824 * BFD Control packet with the Final (F) bit set, independent of any
825 * periodic BFD Control packets it may be sending
826 * (see section 6.8.7). */
827 bfd
->flags
&= ~FLAG_POLL
;
828 bfd
->flags
|= FLAG_FINAL
;
831 rmt_min_rx
= MAX(ntohl(msg
->min_rx
) / 1000, 1);
832 if (bfd
->rmt_min_rx
!= rmt_min_rx
) {
833 bfd
->rmt_min_rx
= rmt_min_rx
;
835 bfd_set_next_tx(bfd
);
837 log_msg(VLL_INFO
, msg
, "New remote min_rx", bfd
);
840 bfd
->rmt_min_tx
= MAX(ntohl(msg
->min_tx
) / 1000, 1);
841 bfd
->detect_time
= bfd_rx_interval(bfd
) * bfd
->mult
+ time_msec();
843 if (bfd
->state
== STATE_ADMIN_DOWN
) {
844 VLOG_DBG_RL(&rl
, "Administratively down, dropping control message.");
848 if (rmt_state
== STATE_ADMIN_DOWN
) {
849 if (bfd
->state
!= STATE_DOWN
) {
850 bfd_set_state(bfd
, STATE_DOWN
, DIAG_RMT_DOWN
);
853 switch (bfd
->state
) {
855 if (rmt_state
== STATE_DOWN
) {
856 bfd_set_state(bfd
, STATE_INIT
, bfd
->diag
);
857 } else if (rmt_state
== STATE_INIT
) {
858 bfd_set_state(bfd
, STATE_UP
, bfd
->diag
);
862 if (rmt_state
> STATE_DOWN
) {
863 bfd_set_state(bfd
, STATE_UP
, bfd
->diag
);
867 if (rmt_state
<= STATE_DOWN
) {
868 bfd_set_state(bfd
, STATE_DOWN
, DIAG_RMT_DOWN
);
869 log_msg(VLL_INFO
, msg
, "Remote signaled STATE_DOWN", bfd
);
872 case STATE_ADMIN_DOWN
:
877 /* XXX: RFC 5880 Section 6.8.6 Demand mode related calculations here. */
879 if (bfd
->forwarding_if_rx
) {
880 bfd
->demand_rx_bfd_time
= time_msec() + 100 * bfd
->cfg_min_rx
;
884 bfd_forwarding__(bfd
);
885 ovs_mutex_unlock(&mutex
);
888 /* Must be called when the netdev owned by 'bfd' should change. */
890 bfd_set_netdev(struct bfd
*bfd
, const struct netdev
*netdev
)
893 ovs_mutex_lock(&mutex
);
894 if (bfd
->netdev
!= netdev
) {
895 netdev_close(bfd
->netdev
);
896 bfd
->netdev
= netdev_ref(netdev
);
897 if (bfd
->decay_min_rx
&& bfd
->state
== STATE_UP
) {
898 bfd_decay_update(bfd
);
900 if (bfd
->forwarding_if_rx
&& bfd
->state
== STATE_UP
) {
901 bfd_forwarding_if_rx_update(bfd
);
903 bfd
->rx_packets
= bfd_rx_packets(bfd
);
905 ovs_mutex_unlock(&mutex
);
909 /* Updates the forwarding flag. If override is not configured and
910 * the forwarding flag value changes, increments the flap count.
912 * Note this function may be called multiple times in a function
913 * (e.g. bfd_account_rx) before and after the bfd state or status
914 * change. This is to capture any forwarding flag flap. */
916 bfd_forwarding__(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
918 long long int now
= time_msec();
919 bool forwarding_if_rx
;
920 bool last_forwarding
= bfd
->last_forwarding
;
922 if (bfd
->forwarding_override
!= -1) {
923 return bfd
->forwarding_override
== 1;
926 forwarding_if_rx
= bfd
->forwarding_if_rx
927 && bfd
->forwarding_if_rx_detect_time
> now
928 && bfd
->demand_rx_bfd_time
> now
;
930 bfd
->last_forwarding
= (bfd
->state
== STATE_UP
|| forwarding_if_rx
)
931 && bfd
->rmt_diag
!= DIAG_PATH_DOWN
932 && bfd
->rmt_diag
!= DIAG_CPATH_DOWN
933 && bfd
->rmt_diag
!= DIAG_RCPATH_DOWN
;
934 if (bfd
->last_forwarding
!= last_forwarding
) {
936 bfd_status_changed(bfd
);
938 return bfd
->last_forwarding
;
943 bfd_lookup_ip(const char *host_name
, struct in_addr
*addr
)
945 if (!inet_pton(AF_INET
, host_name
, addr
)) {
946 VLOG_ERR_RL(&rl
, "\"%s\" is not a valid IP address", host_name
);
953 bfd_in_poll(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
955 return (bfd
->flags
& FLAG_POLL
) != 0;
959 bfd_poll(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
961 if (bfd
->state
> STATE_DOWN
&& !bfd_in_poll(bfd
)
962 && !(bfd
->flags
& FLAG_FINAL
)) {
963 bfd
->poll_min_tx
= bfd
->cfg_min_tx
;
964 bfd
->poll_min_rx
= bfd
->in_decay
? bfd
->decay_min_rx
: bfd
->cfg_min_rx
;
965 bfd
->flags
|= FLAG_POLL
;
967 VLOG_INFO_RL(&rl
, "%s: Initiating poll sequence", bfd
->name
);
972 bfd_min_tx(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
974 /* RFC 5880 Section 6.8.3
975 * When bfd.SessionState is not Up, the system MUST set
976 * bfd.DesiredMinTxInterval to a value of not less than one second
977 * (1,000,000 microseconds). This is intended to ensure that the
978 * bandwidth consumed by BFD sessions that are not Up is negligible,
979 * particularly in the case where a neighbor may not be running BFD. */
980 return (bfd
->state
== STATE_UP
? bfd
->min_tx
: MAX(bfd
->min_tx
, 1000));
984 bfd_tx_interval(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
986 long long int interval
= bfd_min_tx(bfd
);
987 return MAX(interval
, bfd
->rmt_min_rx
);
991 bfd_rx_interval(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
993 return MAX(bfd
->min_rx
, bfd
->rmt_min_tx
);
997 bfd_set_next_tx(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
999 long long int interval
= bfd_tx_interval(bfd
);
1000 interval
-= interval
* random_range(26) / 100;
1001 bfd
->next_tx
= bfd
->last_tx
+ interval
;
1005 bfd_flag_str(enum flags flags
)
1007 struct ds ds
= DS_EMPTY_INITIALIZER
;
1008 static char flag_str
[128];
1014 if (flags
& FLAG_MULTIPOINT
) {
1015 ds_put_cstr(&ds
, "multipoint ");
1018 if (flags
& FLAG_DEMAND
) {
1019 ds_put_cstr(&ds
, "demand ");
1022 if (flags
& FLAG_AUTH
) {
1023 ds_put_cstr(&ds
, "auth ");
1026 if (flags
& FLAG_CTL
) {
1027 ds_put_cstr(&ds
, "ctl ");
1030 if (flags
& FLAG_FINAL
) {
1031 ds_put_cstr(&ds
, "final ");
1034 if (flags
& FLAG_POLL
) {
1035 ds_put_cstr(&ds
, "poll ");
1038 /* Do not copy the trailing whitespace. */
1040 ovs_strlcpy(flag_str
, ds_cstr(&ds
), sizeof flag_str
);
1046 bfd_state_str(enum state state
)
1049 case STATE_ADMIN_DOWN
: return "admin_down";
1050 case STATE_DOWN
: return "down";
1051 case STATE_INIT
: return "init";
1052 case STATE_UP
: return "up";
1053 default: return "invalid";
1058 bfd_diag_str(enum diag diag
) {
1060 case DIAG_NONE
: return "No Diagnostic";
1061 case DIAG_EXPIRED
: return "Control Detection Time Expired";
1062 case DIAG_ECHO_FAILED
: return "Echo Function Failed";
1063 case DIAG_RMT_DOWN
: return "Neighbor Signaled Session Down";
1064 case DIAG_FWD_RESET
: return "Forwarding Plane Reset";
1065 case DIAG_PATH_DOWN
: return "Path Down";
1066 case DIAG_CPATH_DOWN
: return "Concatenated Path Down";
1067 case DIAG_ADMIN_DOWN
: return "Administratively Down";
1068 case DIAG_RCPATH_DOWN
: return "Reverse Concatenated Path Down";
1069 default: return "Invalid Diagnostic";
1074 log_msg(enum vlog_level level
, const struct msg
*p
, const char *message
,
1075 const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1077 struct ds ds
= DS_EMPTY_INITIALIZER
;
1079 if (vlog_should_drop(THIS_MODULE
, level
, &rl
)) {
1085 "\n\tvers:%"PRIu8
" diag:\"%s\" state:%s mult:%"PRIu8
1088 "\n\tmy_disc:0x%"PRIx32
" your_disc:0x%"PRIx32
1089 "\n\tmin_tx:%"PRIu32
"us (%"PRIu32
"ms)"
1090 "\n\tmin_rx:%"PRIu32
"us (%"PRIu32
"ms)"
1091 "\n\tmin_rx_echo:%"PRIu32
"us (%"PRIu32
"ms)",
1092 bfd
->name
, message
, p
->vers_diag
>> VERS_SHIFT
,
1093 bfd_diag_str(p
->vers_diag
& DIAG_MASK
),
1094 bfd_state_str(p
->flags
& STATE_MASK
),
1095 p
->mult
, p
->length
, bfd_flag_str(p
->flags
& FLAGS_MASK
),
1096 ntohl(p
->my_disc
), ntohl(p
->your_disc
),
1097 ntohl(p
->min_tx
), ntohl(p
->min_tx
) / 1000,
1098 ntohl(p
->min_rx
), ntohl(p
->min_rx
) / 1000,
1099 ntohl(p
->min_rx_echo
), ntohl(p
->min_rx_echo
) / 1000);
1100 bfd_put_details(&ds
, bfd
);
1101 VLOG(level
, "%s", ds_cstr(&ds
));
1106 bfd_set_state(struct bfd
*bfd
, enum state state
, enum diag diag
)
1109 if (bfd
->cpath_down
) {
1110 diag
= DIAG_CPATH_DOWN
;
1113 if (bfd
->state
!= state
|| bfd
->diag
!= diag
) {
1114 if (!VLOG_DROP_INFO(&rl
)) {
1115 struct ds ds
= DS_EMPTY_INITIALIZER
;
1117 ds_put_format(&ds
, "%s: BFD state change: %s->%s"
1118 " \"%s\"->\"%s\".\n",
1119 bfd
->name
, bfd_state_str(bfd
->state
),
1120 bfd_state_str(state
), bfd_diag_str(bfd
->diag
),
1121 bfd_diag_str(diag
));
1122 bfd_put_details(&ds
, bfd
);
1123 VLOG_INFO("%s", ds_cstr(&ds
));
1130 if (bfd
->state
<= STATE_DOWN
) {
1131 bfd
->rmt_state
= STATE_DOWN
;
1132 bfd
->rmt_diag
= DIAG_NONE
;
1133 bfd
->rmt_min_rx
= 1;
1136 bfd
->rmt_min_tx
= 0;
1137 /* Resets the min_rx if in_decay. */
1138 if (bfd
->in_decay
) {
1139 bfd
->min_rx
= bfd
->cfg_min_rx
;
1140 bfd
->in_decay
= false;
1143 /* Resets the decay when state changes to STATE_UP
1144 * and decay_min_rx is configured. */
1145 if (bfd
->state
== STATE_UP
&& bfd
->decay_min_rx
) {
1146 bfd_decay_update(bfd
);
1149 bfd_status_changed(bfd
);
1154 bfd_rx_packets(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1156 struct netdev_stats stats
;
1158 if (!netdev_get_stats(bfd
->netdev
, &stats
)) {
1159 return stats
.rx_packets
;
1165 /* Decays the bfd->min_rx to bfd->decay_min_rx when 'diff' is less than
1166 * the 'expect' value. */
1168 bfd_try_decay(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1170 int64_t diff
, expect
;
1172 /* The 'diff' is the difference between current interface rx_packets
1173 * stats and last-time check. The 'expect' is the recorded number of
1174 * bfd control packets received within an approximately decay_min_rx
1175 * (2000 ms if decay_min_rx is less than 2000 ms) interval.
1177 * Since the update of rx_packets stats at interface happens
1178 * asynchronously to the bfd_rx_packets() function, the 'diff' value
1179 * can be jittered. Thusly, we double the decay_rx_ctl to provide
1180 * more wiggle room. */
1181 diff
= bfd_rx_packets(bfd
) - bfd
->decay_rx_packets
;
1182 expect
= 2 * MAX(bfd
->decay_rx_ctl
, 1);
1183 bfd
->in_decay
= diff
<= expect
? true : false;
1184 bfd_decay_update(bfd
);
1187 /* Updates the rx_packets, decay_rx_ctl and decay_detect_time. */
1189 bfd_decay_update(struct bfd
* bfd
) OVS_REQUIRES(mutex
)
1191 bfd
->decay_rx_packets
= bfd_rx_packets(bfd
);
1192 bfd
->decay_rx_ctl
= 0;
1193 bfd
->decay_detect_time
= MAX(bfd
->decay_min_rx
, 2000) + time_msec();
1196 /* Records the status change and changes the global connectivity seq. */
1198 bfd_status_changed(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1200 seq_change(connectivity_seq_get());
1201 bfd
->status_changed
= true;
1205 bfd_forwarding_if_rx_update(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1207 int64_t incr
= bfd_rx_interval(bfd
) * bfd
->mult
;
1208 bfd
->forwarding_if_rx_detect_time
= MAX(incr
, 2000) + time_msec();
1212 generate_discriminator(void)
1216 /* RFC 5880 Section 6.8.1
1217 * It SHOULD be set to a random (but still unique) value to improve
1218 * security. The value is otherwise outside the scope of this
1224 /* 'disc' is by definition random, so there's no reason to waste time
1226 disc
= random_uint32();
1227 HMAP_FOR_EACH_IN_BUCKET (bfd
, node
, disc
, all_bfds
) {
1228 if (bfd
->disc
== disc
) {
1239 bfd_find_by_name(const char *name
) OVS_REQUIRES(mutex
)
1243 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1244 if (!strcmp(bfd
->name
, name
)) {
1252 bfd_put_details(struct ds
*ds
, const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1254 ds_put_format(ds
, "\tForwarding: %s\n",
1255 bfd_forwarding__(CONST_CAST(struct bfd
*, bfd
))
1256 ? "true" : "false");
1257 ds_put_format(ds
, "\tDetect Multiplier: %d\n", bfd
->mult
);
1258 ds_put_format(ds
, "\tConcatenated Path Down: %s\n",
1259 bfd
->cpath_down
? "true" : "false");
1260 ds_put_format(ds
, "\tTX Interval: Approx %lldms\n", bfd_tx_interval(bfd
));
1261 ds_put_format(ds
, "\tRX Interval: Approx %lldms\n", bfd_rx_interval(bfd
));
1262 ds_put_format(ds
, "\tDetect Time: now %+lldms\n",
1263 time_msec() - bfd
->detect_time
);
1264 ds_put_format(ds
, "\tNext TX Time: now %+lldms\n",
1265 time_msec() - bfd
->next_tx
);
1266 ds_put_format(ds
, "\tLast TX Time: now %+lldms\n",
1267 time_msec() - bfd
->last_tx
);
1269 ds_put_cstr(ds
, "\n");
1271 ds_put_format(ds
, "\tLocal Flags: %s\n", bfd_flag_str(bfd
->flags
));
1272 ds_put_format(ds
, "\tLocal Session State: %s\n",
1273 bfd_state_str(bfd
->state
));
1274 ds_put_format(ds
, "\tLocal Diagnostic: %s\n", bfd_diag_str(bfd
->diag
));
1275 ds_put_format(ds
, "\tLocal Discriminator: 0x%"PRIx32
"\n", bfd
->disc
);
1276 ds_put_format(ds
, "\tLocal Minimum TX Interval: %lldms\n",
1278 ds_put_format(ds
, "\tLocal Minimum RX Interval: %lldms\n", bfd
->min_rx
);
1280 ds_put_cstr(ds
, "\n");
1282 ds_put_format(ds
, "\tRemote Flags: %s\n", bfd_flag_str(bfd
->rmt_flags
));
1283 ds_put_format(ds
, "\tRemote Session State: %s\n",
1284 bfd_state_str(bfd
->rmt_state
));
1285 ds_put_format(ds
, "\tRemote Diagnostic: %s\n",
1286 bfd_diag_str(bfd
->rmt_diag
));
1287 ds_put_format(ds
, "\tRemote Discriminator: 0x%"PRIx32
"\n", bfd
->rmt_disc
);
1288 ds_put_format(ds
, "\tRemote Minimum TX Interval: %lldms\n",
1290 ds_put_format(ds
, "\tRemote Minimum RX Interval: %lldms\n",
1295 bfd_unixctl_show(struct unixctl_conn
*conn
, int argc
, const char *argv
[],
1296 void *aux OVS_UNUSED
) OVS_EXCLUDED(mutex
)
1298 struct ds ds
= DS_EMPTY_INITIALIZER
;
1301 ovs_mutex_lock(&mutex
);
1303 bfd
= bfd_find_by_name(argv
[1]);
1305 unixctl_command_reply_error(conn
, "no such bfd object");
1308 bfd_put_details(&ds
, bfd
);
1310 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1311 ds_put_format(&ds
, "---- %s ----\n", bfd
->name
);
1312 bfd_put_details(&ds
, bfd
);
1315 unixctl_command_reply(conn
, ds_cstr(&ds
));
1319 ovs_mutex_unlock(&mutex
);
1324 bfd_unixctl_set_forwarding_override(struct unixctl_conn
*conn
, int argc
,
1325 const char *argv
[], void *aux OVS_UNUSED
)
1328 const char *forward_str
= argv
[argc
- 1];
1329 int forwarding_override
;
1332 ovs_mutex_lock(&mutex
);
1333 if (!strcasecmp("true", forward_str
)) {
1334 forwarding_override
= 1;
1335 } else if (!strcasecmp("false", forward_str
)) {
1336 forwarding_override
= 0;
1337 } else if (!strcasecmp("normal", forward_str
)) {
1338 forwarding_override
= -1;
1340 unixctl_command_reply_error(conn
, "unknown fault string");
1345 bfd
= bfd_find_by_name(argv
[1]);
1347 unixctl_command_reply_error(conn
, "no such BFD object");
1350 bfd
->forwarding_override
= forwarding_override
;
1351 bfd_status_changed(bfd
);
1353 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1354 bfd
->forwarding_override
= forwarding_override
;
1355 bfd_status_changed(bfd
);
1359 unixctl_command_reply(conn
, "OK");
1362 ovs_mutex_unlock(&mutex
);