1 /* Copyright (c) 2013, 2014, 2015, 2016 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 "openvswitch/dynamic-string.h"
32 #include "openvswitch/hmap.h"
33 #include "openvswitch/list.h"
36 #include "openvswitch/ofpbuf.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 bool oam
; /* Set tunnel OAM flag if applicable. */
173 uint32_t rmt_disc
; /* bfd.RemoteDiscr. */
175 struct eth_addr local_eth_src
; /* Local eth src address. */
176 struct eth_addr local_eth_dst
; /* Local eth dst address. */
178 struct eth_addr rmt_eth_dst
; /* Remote eth dst address. */
180 ovs_be32 ip_src
; /* IPv4 source address. */
181 ovs_be32 ip_dst
; /* IPv4 destination address. */
183 uint16_t udp_src
; /* UDP source port. */
185 /* All timers in milliseconds. */
186 long long int rmt_min_rx
; /* bfd.RemoteMinRxInterval. */
187 long long int rmt_min_tx
; /* Remote minimum TX interval. */
189 long long int cfg_min_tx
; /* Configured minimum TX rate. */
190 long long int cfg_min_rx
; /* Configured required minimum RX rate. */
191 long long int poll_min_tx
; /* Min TX negotating in a poll sequence. */
192 long long int poll_min_rx
; /* Min RX negotating in a poll sequence. */
193 long long int min_tx
; /* bfd.DesiredMinTxInterval. */
194 long long int min_rx
; /* bfd.RequiredMinRxInterval. */
196 long long int last_tx
; /* Last TX time. */
197 long long int next_tx
; /* Next TX time. */
198 long long int detect_time
; /* RFC 5880 6.8.4 Detection time. */
200 bool last_forwarding
; /* Last calculation of forwarding flag. */
201 int forwarding_override
; /* Manual override of 'forwarding' status. */
203 atomic_bool check_tnl_key
; /* Verify tunnel key of inbound packets? */
204 struct ovs_refcount ref_cnt
;
206 /* When forward_if_rx is true, bfd_forwarding() will return
207 * true as long as there are incoming packets received.
208 * Note, forwarding_override still has higher priority. */
209 bool forwarding_if_rx
;
210 long long int forwarding_if_rx_detect_time
;
212 /* When 'bfd->forwarding_if_rx' is set, at least one bfd control packet
213 * is required to be received every 100 * bfd->cfg_min_rx. If bfd
214 * control packet is not received within this interval, even if data
215 * packets are received, the bfd->forwarding will still be false. */
216 long long int demand_rx_bfd_time
;
218 /* BFD decay related variables. */
219 bool in_decay
; /* True when bfd is in decay. */
220 int decay_min_rx
; /* min_rx is set to decay_min_rx when */
222 int decay_rx_ctl
; /* Count bfd packets received within decay */
223 /* detect interval. */
224 uint64_t decay_rx_packets
; /* Packets received by 'netdev'. */
225 long long int decay_detect_time
; /* Decay detection time. */
227 uint64_t flap_count
; /* Counts bfd forwarding flaps. */
229 /* True when the variables returned by bfd_get_status() are changed
230 * since last check. */
234 static struct ovs_mutex mutex
= OVS_MUTEX_INITIALIZER
;
235 static struct hmap all_bfds__
= HMAP_INITIALIZER(&all_bfds__
);
236 static struct hmap
*const all_bfds
OVS_GUARDED_BY(mutex
) = &all_bfds__
;
238 static bool bfd_lookup_ip(const char *host_name
, struct in_addr
*)
240 static bool bfd_forwarding__(struct bfd
*) OVS_REQUIRES(mutex
);
241 static bool bfd_in_poll(const struct bfd
*) OVS_REQUIRES(mutex
);
242 static void bfd_poll(struct bfd
*bfd
) OVS_REQUIRES(mutex
);
243 static const char *bfd_diag_str(enum diag
) OVS_REQUIRES(mutex
);
244 static const char *bfd_state_str(enum state
) OVS_REQUIRES(mutex
);
245 static long long int bfd_min_tx(const struct bfd
*) OVS_REQUIRES(mutex
);
246 static long long int bfd_tx_interval(const struct bfd
*)
248 static long long int bfd_rx_interval(const struct bfd
*)
250 static void bfd_set_next_tx(struct bfd
*) OVS_REQUIRES(mutex
);
251 static void bfd_set_state(struct bfd
*, enum state
, enum diag
)
253 static uint32_t generate_discriminator(void) OVS_REQUIRES(mutex
);
254 static void bfd_put_details(struct ds
*, const struct bfd
*)
256 static uint64_t bfd_rx_packets(const struct bfd
*) OVS_REQUIRES(mutex
);
257 static void bfd_try_decay(struct bfd
*) OVS_REQUIRES(mutex
);
258 static void bfd_decay_update(struct bfd
*) OVS_REQUIRES(mutex
);
259 static void bfd_status_changed(struct bfd
*) OVS_REQUIRES(mutex
);
261 static void bfd_forwarding_if_rx_update(struct bfd
*) OVS_REQUIRES(mutex
);
262 static void bfd_unixctl_show(struct unixctl_conn
*, int argc
,
263 const char *argv
[], void *aux OVS_UNUSED
);
264 static void bfd_unixctl_set_forwarding_override(struct unixctl_conn
*,
265 int argc
, const char *argv
[],
266 void *aux OVS_UNUSED
);
267 static void log_msg(enum vlog_level
, const struct msg
*, const char *message
,
268 const struct bfd
*) OVS_REQUIRES(mutex
);
270 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(20, 20);
272 /* Returns true if the interface on which 'bfd' is running may be used to
273 * forward traffic according to the BFD session state. */
275 bfd_forwarding(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
279 ovs_mutex_lock(&mutex
);
280 ret
= bfd_forwarding__(bfd
);
281 ovs_mutex_unlock(&mutex
);
285 /* When forwarding_if_rx is enabled, if there are packets received,
286 * updates forwarding_if_rx_detect_time. */
288 bfd_account_rx(struct bfd
*bfd
, const struct dpif_flow_stats
*stats
)
290 if (stats
->n_packets
&& bfd
->forwarding_if_rx
) {
291 ovs_mutex_lock(&mutex
);
292 bfd_forwarding__(bfd
);
293 bfd_forwarding_if_rx_update(bfd
);
294 bfd_forwarding__(bfd
);
295 ovs_mutex_unlock(&mutex
);
299 /* Returns and resets the 'bfd->status_changed'. */
301 bfd_check_status_change(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
305 ovs_mutex_lock(&mutex
);
306 ret
= bfd
->status_changed
;
307 bfd
->status_changed
= false;
308 ovs_mutex_unlock(&mutex
);
313 /* Returns a 'smap' of key value pairs representing the status of 'bfd'
314 * intended for the OVS database. */
316 bfd_get_status(const struct bfd
*bfd
, struct smap
*smap
)
319 ovs_mutex_lock(&mutex
);
320 smap_add(smap
, "forwarding",
321 bfd_forwarding__(CONST_CAST(struct bfd
*, bfd
))
323 smap_add(smap
, "state", bfd_state_str(bfd
->state
));
324 smap_add(smap
, "diagnostic", bfd_diag_str(bfd
->diag
));
325 smap_add_format(smap
, "flap_count", "%"PRIu64
, bfd
->flap_count
);
326 smap_add(smap
, "remote_state", bfd_state_str(bfd
->rmt_state
));
327 smap_add(smap
, "remote_diagnostic", bfd_diag_str(bfd
->rmt_diag
));
328 ovs_mutex_unlock(&mutex
);
334 unixctl_command_register("bfd/show", "[interface]", 0, 1,
335 bfd_unixctl_show
, NULL
);
336 unixctl_command_register("bfd/set-forwarding",
337 "[interface] normal|false|true", 1, 2,
338 bfd_unixctl_set_forwarding_override
, NULL
);
341 /* Initializes, destroys, or reconfigures the BFD session 'bfd' (named 'name'),
342 * according to the database configuration contained in 'cfg'. Takes ownership
343 * of 'bfd', which may be NULL. Returns a BFD object which may be used as a
344 * handle for the session, or NULL if BFD is not enabled according to 'cfg'.
345 * Also returns NULL if cfg is NULL. */
347 bfd_configure(struct bfd
*bfd
, const char *name
, const struct smap
*cfg
,
348 struct netdev
*netdev
) OVS_EXCLUDED(mutex
)
350 static atomic_count udp_src
= ATOMIC_COUNT_INIT(0);
353 long long int min_tx
, min_rx
;
354 bool need_poll
= false;
355 bool cfg_min_rx_changed
= false;
356 bool cpath_down
, forwarding_if_rx
;
357 const char *hwaddr
, *ip_src
, *ip_dst
;
358 struct in_addr in_addr
;
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 ovs_refcount_init(&bfd
->ref_cnt
);
378 bfd
->netdev
= netdev_ref(netdev
);
379 bfd
->rx_packets
= bfd_rx_packets(bfd
);
380 bfd
->in_decay
= false;
383 /* RFC 5881 section 4
384 * The source port MUST be in the range 49152 through 65535. The same
385 * UDP source port number MUST be used for all BFD Control packets
386 * associated with a particular session. The source port number SHOULD
387 * be unique among all BFD sessions on the system. */
388 bfd
->udp_src
= (atomic_count_inc(&udp_src
) % 16384) + 49152;
390 bfd_set_state(bfd
, STATE_DOWN
, DIAG_NONE
);
392 bfd_status_changed(bfd
);
395 bfd
->oam
= smap_get_bool(cfg
, "oam", false);
397 atomic_store_relaxed(&bfd
->check_tnl_key
,
398 smap_get_bool(cfg
, "check_tnl_key", false));
399 min_tx
= smap_get_int(cfg
, "min_tx", 100);
400 min_tx
= MAX(min_tx
, 1);
401 if (bfd
->cfg_min_tx
!= min_tx
) {
402 bfd
->cfg_min_tx
= min_tx
;
403 if (bfd
->state
!= STATE_UP
404 || (!bfd_in_poll(bfd
) && bfd
->cfg_min_tx
< bfd
->min_tx
)) {
405 bfd
->min_tx
= bfd
->cfg_min_tx
;
410 min_rx
= smap_get_int(cfg
, "min_rx", 1000);
411 min_rx
= MAX(min_rx
, 1);
412 if (bfd
->cfg_min_rx
!= min_rx
) {
413 bfd
->cfg_min_rx
= min_rx
;
414 if (bfd
->state
!= STATE_UP
415 || (!bfd_in_poll(bfd
) && bfd
->cfg_min_rx
> bfd
->min_rx
)) {
416 bfd
->min_rx
= bfd
->cfg_min_rx
;
418 cfg_min_rx_changed
= true;
422 decay_min_rx
= smap_get_int(cfg
, "decay_min_rx", 0);
423 if (bfd
->decay_min_rx
!= decay_min_rx
|| cfg_min_rx_changed
) {
424 if (decay_min_rx
> 0 && decay_min_rx
< bfd
->cfg_min_rx
) {
425 VLOG_WARN("%s: decay_min_rx cannot be less than %lld ms",
426 bfd
->name
, bfd
->cfg_min_rx
);
427 bfd
->decay_min_rx
= 0;
429 bfd
->decay_min_rx
= decay_min_rx
;
432 bfd
->in_decay
= false;
433 bfd_decay_update(bfd
);
437 cpath_down
= smap_get_bool(cfg
, "cpath_down", false);
438 if (bfd
->cpath_down
!= cpath_down
) {
439 bfd
->cpath_down
= cpath_down
;
440 bfd_set_state(bfd
, bfd
->state
, DIAG_NONE
);
444 hwaddr
= smap_get(cfg
, "bfd_local_src_mac");
445 if (hwaddr
&& eth_addr_from_string(hwaddr
, &ea
)) {
446 bfd
->local_eth_src
= ea
;
448 bfd
->local_eth_src
= eth_addr_zero
;
451 hwaddr
= smap_get(cfg
, "bfd_local_dst_mac");
452 if (hwaddr
&& eth_addr_from_string(hwaddr
, &ea
)) {
453 bfd
->local_eth_dst
= ea
;
455 bfd
->local_eth_dst
= eth_addr_zero
;
458 hwaddr
= smap_get(cfg
, "bfd_remote_dst_mac");
459 if (hwaddr
&& eth_addr_from_string(hwaddr
, &ea
)) {
460 bfd
->rmt_eth_dst
= ea
;
462 bfd
->rmt_eth_dst
= eth_addr_zero
;
465 ip_src
= smap_get(cfg
, "bfd_src_ip");
466 if (ip_src
&& bfd_lookup_ip(ip_src
, &in_addr
)) {
467 memcpy(&bfd
->ip_src
, &in_addr
, sizeof in_addr
);
469 bfd
->ip_src
= htonl(0xA9FE0101); /* 169.254.1.1. */
472 ip_dst
= smap_get(cfg
, "bfd_dst_ip");
473 if (ip_dst
&& bfd_lookup_ip(ip_dst
, &in_addr
)) {
474 memcpy(&bfd
->ip_dst
, &in_addr
, sizeof in_addr
);
476 bfd
->ip_dst
= htonl(0xA9FE0100); /* 169.254.1.0. */
479 forwarding_if_rx
= smap_get_bool(cfg
, "forwarding_if_rx", false);
480 if (bfd
->forwarding_if_rx
!= forwarding_if_rx
) {
481 bfd
->forwarding_if_rx
= forwarding_if_rx
;
482 if (bfd
->state
== STATE_UP
&& bfd
->forwarding_if_rx
) {
483 bfd_forwarding_if_rx_update(bfd
);
485 bfd
->forwarding_if_rx_detect_time
= 0;
492 ovs_mutex_unlock(&mutex
);
497 bfd_ref(const struct bfd
*bfd_
)
499 struct bfd
*bfd
= CONST_CAST(struct bfd
*, bfd_
);
501 ovs_refcount_ref(&bfd
->ref_cnt
);
507 bfd_unref(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
509 if (bfd
&& ovs_refcount_unref_relaxed(&bfd
->ref_cnt
) == 1) {
510 ovs_mutex_lock(&mutex
);
511 bfd_status_changed(bfd
);
512 hmap_remove(all_bfds
, &bfd
->node
);
513 netdev_close(bfd
->netdev
);
516 ovs_mutex_unlock(&mutex
);
521 bfd_wait(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
523 long long int wake_time
= bfd_wake_time(bfd
);
524 poll_timer_wait_until(wake_time
);
528 /* Returns the next wake up time. */
530 bfd_wake_time(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
532 long long int retval
;
538 ovs_mutex_lock(&mutex
);
539 if (bfd
->flags
& FLAG_FINAL
) {
542 retval
= bfd
->next_tx
;
543 if (bfd
->state
> STATE_DOWN
) {
544 retval
= MIN(bfd
->detect_time
, retval
);
547 ovs_mutex_unlock(&mutex
);
552 bfd_run(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
557 ovs_mutex_lock(&mutex
);
559 old_in_decay
= bfd
->in_decay
;
561 if (bfd
->state
> STATE_DOWN
&& now
>= bfd
->detect_time
) {
562 bfd_set_state(bfd
, STATE_DOWN
, DIAG_EXPIRED
);
564 bfd_forwarding__(bfd
);
566 /* Decay may only happen when state is STATE_UP, bfd->decay_min_rx is
567 * configured, and decay_detect_time is reached. */
568 if (bfd
->state
== STATE_UP
&& bfd
->decay_min_rx
> 0
569 && now
>= bfd
->decay_detect_time
) {
573 if (bfd
->min_tx
!= bfd
->cfg_min_tx
574 || (bfd
->min_rx
!= bfd
->cfg_min_rx
&& bfd
->min_rx
!= bfd
->decay_min_rx
)
575 || bfd
->in_decay
!= old_in_decay
) {
578 ovs_mutex_unlock(&mutex
);
582 bfd_should_send_packet(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
585 ovs_mutex_lock(&mutex
);
586 ret
= bfd
->flags
& FLAG_FINAL
|| time_msec() >= bfd
->next_tx
;
587 ovs_mutex_unlock(&mutex
);
592 bfd_put_packet(struct bfd
*bfd
, struct dp_packet
*p
,
593 const struct eth_addr eth_src
, bool *oam
) OVS_EXCLUDED(mutex
)
595 long long int min_tx
, min_rx
;
596 struct udp_header
*udp
;
597 struct eth_header
*eth
;
598 struct ip_header
*ip
;
601 ovs_mutex_lock(&mutex
);
603 long long int delay
= time_msec() - bfd
->next_tx
;
604 long long int interval
= bfd_tx_interval(bfd
);
605 if (delay
> interval
* 3 / 2) {
606 VLOG_INFO("%s: long delay of %lldms (expected %lldms) sending BFD"
607 " control message", bfd
->name
, delay
, interval
);
611 /* RFC 5880 Section 6.5
612 * A BFD Control packet MUST NOT have both the Poll (P) and Final (F) bits
614 ovs_assert(!(bfd
->flags
& FLAG_POLL
) || !(bfd
->flags
& FLAG_FINAL
));
616 dp_packet_reserve(p
, 2); /* Properly align after the ethernet header. */
617 eth
= dp_packet_put_uninit(p
, sizeof *eth
);
618 eth
->eth_src
= eth_addr_is_zero(bfd
->local_eth_src
)
619 ? eth_src
: bfd
->local_eth_src
;
620 eth
->eth_dst
= eth_addr_is_zero(bfd
->local_eth_dst
)
621 ? eth_addr_bfd
: bfd
->local_eth_dst
;
622 eth
->eth_type
= htons(ETH_TYPE_IP
);
624 ip
= dp_packet_put_zeros(p
, sizeof *ip
);
625 ip
->ip_ihl_ver
= IP_IHL_VER(5, 4);
626 ip
->ip_tot_len
= htons(sizeof *ip
+ sizeof *udp
+ sizeof *msg
);
628 ip
->ip_tos
= IPTOS_LOWDELAY
| IPTOS_THROUGHPUT
;
629 ip
->ip_proto
= IPPROTO_UDP
;
630 put_16aligned_be32(&ip
->ip_src
, bfd
->ip_src
);
631 put_16aligned_be32(&ip
->ip_dst
, bfd
->ip_dst
);
632 ip
->ip_csum
= csum(ip
, sizeof *ip
);
634 udp
= dp_packet_put_zeros(p
, sizeof *udp
);
635 udp
->udp_src
= htons(bfd
->udp_src
);
636 udp
->udp_dst
= htons(BFD_DEST_PORT
);
637 udp
->udp_len
= htons(sizeof *udp
+ sizeof *msg
);
639 msg
= dp_packet_put_uninit(p
, sizeof *msg
);
640 msg
->vers_diag
= (BFD_VERSION
<< 5) | bfd
->diag
;
641 msg
->flags
= (bfd
->state
& STATE_MASK
) | bfd
->flags
;
643 msg
->mult
= bfd
->mult
;
644 msg
->length
= BFD_PACKET_LEN
;
645 msg
->my_disc
= htonl(bfd
->disc
);
646 msg
->your_disc
= htonl(bfd
->rmt_disc
);
647 msg
->min_rx_echo
= htonl(0);
649 if (bfd_in_poll(bfd
)) {
650 min_tx
= bfd
->poll_min_tx
;
651 min_rx
= bfd
->poll_min_rx
;
653 min_tx
= bfd_min_tx(bfd
);
654 min_rx
= bfd
->min_rx
;
657 msg
->min_tx
= htonl(min_tx
* 1000);
658 msg
->min_rx
= htonl(min_rx
* 1000);
660 bfd
->flags
&= ~FLAG_FINAL
;
663 log_msg(VLL_DBG
, msg
, "Sending BFD Message", bfd
);
665 bfd
->last_tx
= time_msec();
666 bfd_set_next_tx(bfd
);
667 ovs_mutex_unlock(&mutex
);
671 bfd_should_process_flow(const struct bfd
*bfd_
, const struct flow
*flow
,
672 struct flow_wildcards
*wc
)
674 struct bfd
*bfd
= CONST_CAST(struct bfd
*, bfd_
);
676 if (!eth_addr_is_zero(bfd
->rmt_eth_dst
)) {
677 memset(&wc
->masks
.dl_dst
, 0xff, sizeof wc
->masks
.dl_dst
);
679 if (!eth_addr_equals(bfd
->rmt_eth_dst
, flow
->dl_dst
)) {
684 if (flow
->dl_type
== htons(ETH_TYPE_IP
)) {
685 memset(&wc
->masks
.nw_proto
, 0xff, sizeof wc
->masks
.nw_proto
);
686 if (flow
->nw_proto
== IPPROTO_UDP
) {
687 memset(&wc
->masks
.tp_dst
, 0xff, sizeof wc
->masks
.tp_dst
);
688 if (flow
->tp_dst
== htons(BFD_DEST_PORT
)) {
691 atomic_read_relaxed(&bfd
->check_tnl_key
, &check_tnl_key
);
693 memset(&wc
->masks
.tunnel
.tun_id
, 0xff,
694 sizeof wc
->masks
.tunnel
.tun_id
);
695 return flow
->tunnel
.tun_id
== htonll(0);
705 bfd_process_packet(struct bfd
*bfd
, const struct flow
*flow
,
706 const struct dp_packet
*p
) OVS_EXCLUDED(mutex
)
708 uint32_t rmt_min_rx
, pkt_your_disc
;
709 enum state rmt_state
;
713 const uint8_t *l7
= dp_packet_get_udp_payload(p
);
716 return; /* No UDP payload. */
719 /* This function is designed to follow section RFC 5880 6.8.6 closely. */
721 ovs_mutex_lock(&mutex
);
722 /* Increments the decay rx counter. */
725 bfd_forwarding__(bfd
);
727 if (flow
->nw_ttl
!= 255) {
728 /* XXX Should drop in the kernel to prevent DOS. */
732 msg
= dp_packet_at(p
, l7
- (uint8_t *)dp_packet_data(p
), BFD_PACKET_LEN
);
734 VLOG_INFO_RL(&rl
, "%s: Received too-short BFD control message (only "
735 "%"PRIdPTR
" bytes long, at least %d required).",
736 bfd
->name
, (uint8_t *) dp_packet_tail(p
) - l7
,
741 /* RFC 5880 Section 6.8.6
742 * If the Length field is greater than the payload of the encapsulating
743 * protocol, the packet MUST be discarded.
745 * Note that we make this check implicitly. Above we use dp_packet_at() to
746 * ensure that there are at least BFD_PACKET_LEN bytes in the payload of
747 * the encapsulating protocol. Below we require msg->length to be exactly
748 * BFD_PACKET_LEN bytes. */
750 flags
= msg
->flags
& FLAGS_MASK
;
751 rmt_state
= msg
->flags
& STATE_MASK
;
752 version
= msg
->vers_diag
>> VERS_SHIFT
;
754 log_msg(VLL_DBG
, msg
, "Received BFD control message", bfd
);
756 if (version
!= BFD_VERSION
) {
757 log_msg(VLL_WARN
, msg
, "Incorrect version", bfd
);
761 /* Technically this should happen after the length check. We don't support
762 * authentication however, so it's simpler to do the check first. */
763 if (flags
& FLAG_AUTH
) {
764 log_msg(VLL_WARN
, msg
, "Authenticated control message with"
765 " authentication disabled", bfd
);
769 if (msg
->length
!= BFD_PACKET_LEN
) {
770 log_msg(VLL_WARN
, msg
, "Unexpected length", bfd
);
771 if (msg
->length
< BFD_PACKET_LEN
) {
777 log_msg(VLL_WARN
, msg
, "Zero multiplier", bfd
);
781 if (flags
& FLAG_MULTIPOINT
) {
782 log_msg(VLL_WARN
, msg
, "Unsupported multipoint flag", bfd
);
787 log_msg(VLL_WARN
, msg
, "NULL my_disc", bfd
);
791 pkt_your_disc
= ntohl(msg
->your_disc
);
793 /* Technically, we should use the your discriminator field to figure
794 * out which 'struct bfd' this packet is destined towards. That way a
795 * bfd session could migrate from one interface to another
796 * transparently. This doesn't fit in with the OVS structure very
797 * well, so in this respect, we are not compliant. */
798 if (pkt_your_disc
!= bfd
->disc
) {
799 log_msg(VLL_WARN
, msg
, "Incorrect your_disc", bfd
);
802 } else if (rmt_state
> STATE_DOWN
) {
803 log_msg(VLL_WARN
, msg
, "Null your_disc", bfd
);
807 if (bfd
->rmt_state
!= rmt_state
) {
808 bfd_status_changed(bfd
);
811 bfd
->rmt_disc
= ntohl(msg
->my_disc
);
812 bfd
->rmt_state
= rmt_state
;
813 bfd
->rmt_flags
= flags
;
814 bfd
->rmt_diag
= msg
->vers_diag
& DIAG_MASK
;
816 if (flags
& FLAG_FINAL
&& bfd_in_poll(bfd
)) {
817 bfd
->min_tx
= bfd
->poll_min_tx
;
818 bfd
->min_rx
= bfd
->poll_min_rx
;
819 bfd
->flags
&= ~FLAG_POLL
;
820 log_msg(VLL_INFO
, msg
, "Poll sequence terminated", bfd
);
823 if (flags
& FLAG_POLL
) {
824 /* RFC 5880 Section 6.5
825 * When the other system receives a Poll, it immediately transmits a
826 * BFD Control packet with the Final (F) bit set, independent of any
827 * periodic BFD Control packets it may be sending
828 * (see section 6.8.7). */
829 bfd
->flags
&= ~FLAG_POLL
;
830 bfd
->flags
|= FLAG_FINAL
;
833 rmt_min_rx
= MAX(ntohl(msg
->min_rx
) / 1000, 1);
834 if (bfd
->rmt_min_rx
!= rmt_min_rx
) {
835 bfd
->rmt_min_rx
= rmt_min_rx
;
837 bfd_set_next_tx(bfd
);
839 log_msg(VLL_INFO
, msg
, "New remote min_rx", bfd
);
842 bfd
->rmt_min_tx
= MAX(ntohl(msg
->min_tx
) / 1000, 1);
843 bfd
->detect_time
= bfd_rx_interval(bfd
) * bfd
->mult
+ time_msec();
845 if (bfd
->state
== STATE_ADMIN_DOWN
) {
846 VLOG_DBG_RL(&rl
, "Administratively down, dropping control message.");
850 if (rmt_state
== STATE_ADMIN_DOWN
) {
851 if (bfd
->state
!= STATE_DOWN
) {
852 bfd_set_state(bfd
, STATE_DOWN
, DIAG_RMT_DOWN
);
855 switch (bfd
->state
) {
857 if (rmt_state
== STATE_DOWN
) {
858 bfd_set_state(bfd
, STATE_INIT
, bfd
->diag
);
859 } else if (rmt_state
== STATE_INIT
) {
860 bfd_set_state(bfd
, STATE_UP
, bfd
->diag
);
864 if (rmt_state
> STATE_DOWN
) {
865 bfd_set_state(bfd
, STATE_UP
, bfd
->diag
);
869 if (rmt_state
<= STATE_DOWN
) {
870 bfd_set_state(bfd
, STATE_DOWN
, DIAG_RMT_DOWN
);
871 log_msg(VLL_INFO
, msg
, "Remote signaled STATE_DOWN", bfd
);
874 case STATE_ADMIN_DOWN
:
879 /* XXX: RFC 5880 Section 6.8.6 Demand mode related calculations here. */
881 if (bfd
->forwarding_if_rx
) {
882 bfd
->demand_rx_bfd_time
= time_msec() + 100 * bfd
->cfg_min_rx
;
886 bfd_forwarding__(bfd
);
887 ovs_mutex_unlock(&mutex
);
890 /* Must be called when the netdev owned by 'bfd' should change. */
892 bfd_set_netdev(struct bfd
*bfd
, const struct netdev
*netdev
)
895 ovs_mutex_lock(&mutex
);
896 if (bfd
->netdev
!= netdev
) {
897 netdev_close(bfd
->netdev
);
898 bfd
->netdev
= netdev_ref(netdev
);
899 if (bfd
->decay_min_rx
&& bfd
->state
== STATE_UP
) {
900 bfd_decay_update(bfd
);
902 if (bfd
->forwarding_if_rx
&& bfd
->state
== STATE_UP
) {
903 bfd_forwarding_if_rx_update(bfd
);
905 bfd
->rx_packets
= bfd_rx_packets(bfd
);
907 ovs_mutex_unlock(&mutex
);
911 /* Updates the forwarding flag. If override is not configured and
912 * the forwarding flag value changes, increments the flap count.
914 * Note this function may be called multiple times in a function
915 * (e.g. bfd_account_rx) before and after the bfd state or status
916 * change. This is to capture any forwarding flag flap. */
918 bfd_forwarding__(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
920 long long int now
= time_msec();
921 bool forwarding_if_rx
;
922 bool last_forwarding
= bfd
->last_forwarding
;
924 if (bfd
->forwarding_override
!= -1) {
925 return bfd
->forwarding_override
== 1;
928 forwarding_if_rx
= bfd
->forwarding_if_rx
929 && bfd
->forwarding_if_rx_detect_time
> now
930 && bfd
->demand_rx_bfd_time
> now
;
932 bfd
->last_forwarding
= (bfd
->state
== STATE_UP
|| forwarding_if_rx
)
933 && bfd
->rmt_diag
!= DIAG_PATH_DOWN
934 && bfd
->rmt_diag
!= DIAG_CPATH_DOWN
935 && bfd
->rmt_diag
!= DIAG_RCPATH_DOWN
;
936 if (bfd
->last_forwarding
!= last_forwarding
) {
938 bfd_status_changed(bfd
);
940 return bfd
->last_forwarding
;
945 bfd_lookup_ip(const char *host_name
, struct in_addr
*addr
)
947 if (!ip_parse(host_name
, &addr
->s_addr
)) {
948 VLOG_ERR_RL(&rl
, "\"%s\" is not a valid IP address", host_name
);
955 bfd_in_poll(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
957 return (bfd
->flags
& FLAG_POLL
) != 0;
961 bfd_poll(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
963 if (bfd
->state
> STATE_DOWN
&& !bfd_in_poll(bfd
)
964 && !(bfd
->flags
& FLAG_FINAL
)) {
965 bfd
->poll_min_tx
= bfd
->cfg_min_tx
;
966 bfd
->poll_min_rx
= bfd
->in_decay
? bfd
->decay_min_rx
: bfd
->cfg_min_rx
;
967 bfd
->flags
|= FLAG_POLL
;
969 VLOG_INFO_RL(&rl
, "%s: Initiating poll sequence", bfd
->name
);
974 bfd_min_tx(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
976 /* RFC 5880 Section 6.8.3
977 * When bfd.SessionState is not Up, the system MUST set
978 * bfd.DesiredMinTxInterval to a value of not less than one second
979 * (1,000,000 microseconds). This is intended to ensure that the
980 * bandwidth consumed by BFD sessions that are not Up is negligible,
981 * particularly in the case where a neighbor may not be running BFD. */
982 return (bfd
->state
== STATE_UP
? bfd
->min_tx
: MAX(bfd
->min_tx
, 1000));
986 bfd_tx_interval(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
988 long long int interval
= bfd_min_tx(bfd
);
989 return MAX(interval
, bfd
->rmt_min_rx
);
993 bfd_rx_interval(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
995 return MAX(bfd
->min_rx
, bfd
->rmt_min_tx
);
999 bfd_set_next_tx(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1001 long long int interval
= bfd_tx_interval(bfd
);
1002 interval
-= interval
* random_range(26) / 100;
1003 bfd
->next_tx
= bfd
->last_tx
+ interval
;
1007 bfd_flag_str(enum flags flags
)
1009 struct ds ds
= DS_EMPTY_INITIALIZER
;
1010 static char flag_str
[128];
1016 if (flags
& FLAG_MULTIPOINT
) {
1017 ds_put_cstr(&ds
, "multipoint ");
1020 if (flags
& FLAG_DEMAND
) {
1021 ds_put_cstr(&ds
, "demand ");
1024 if (flags
& FLAG_AUTH
) {
1025 ds_put_cstr(&ds
, "auth ");
1028 if (flags
& FLAG_CTL
) {
1029 ds_put_cstr(&ds
, "ctl ");
1032 if (flags
& FLAG_FINAL
) {
1033 ds_put_cstr(&ds
, "final ");
1036 if (flags
& FLAG_POLL
) {
1037 ds_put_cstr(&ds
, "poll ");
1040 /* Do not copy the trailing whitespace. */
1042 ovs_strlcpy(flag_str
, ds_cstr(&ds
), sizeof flag_str
);
1048 bfd_state_str(enum state state
)
1051 case STATE_ADMIN_DOWN
: return "admin_down";
1052 case STATE_DOWN
: return "down";
1053 case STATE_INIT
: return "init";
1054 case STATE_UP
: return "up";
1055 default: return "invalid";
1060 bfd_diag_str(enum diag diag
) {
1062 case DIAG_NONE
: return "No Diagnostic";
1063 case DIAG_EXPIRED
: return "Control Detection Time Expired";
1064 case DIAG_ECHO_FAILED
: return "Echo Function Failed";
1065 case DIAG_RMT_DOWN
: return "Neighbor Signaled Session Down";
1066 case DIAG_FWD_RESET
: return "Forwarding Plane Reset";
1067 case DIAG_PATH_DOWN
: return "Path Down";
1068 case DIAG_CPATH_DOWN
: return "Concatenated Path Down";
1069 case DIAG_ADMIN_DOWN
: return "Administratively Down";
1070 case DIAG_RCPATH_DOWN
: return "Reverse Concatenated Path Down";
1071 default: return "Invalid Diagnostic";
1076 log_msg(enum vlog_level level
, const struct msg
*p
, const char *message
,
1077 const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1079 struct ds ds
= DS_EMPTY_INITIALIZER
;
1081 if (vlog_should_drop(&this_module
, level
, &rl
)) {
1087 "\n\tvers:%"PRIu8
" diag:\"%s\" state:%s mult:%"PRIu8
1090 "\n\tmy_disc:0x%"PRIx32
" your_disc:0x%"PRIx32
1091 "\n\tmin_tx:%"PRIu32
"us (%"PRIu32
"ms)"
1092 "\n\tmin_rx:%"PRIu32
"us (%"PRIu32
"ms)"
1093 "\n\tmin_rx_echo:%"PRIu32
"us (%"PRIu32
"ms)",
1094 bfd
->name
, message
, p
->vers_diag
>> VERS_SHIFT
,
1095 bfd_diag_str(p
->vers_diag
& DIAG_MASK
),
1096 bfd_state_str(p
->flags
& STATE_MASK
),
1097 p
->mult
, p
->length
, bfd_flag_str(p
->flags
& FLAGS_MASK
),
1098 ntohl(p
->my_disc
), ntohl(p
->your_disc
),
1099 ntohl(p
->min_tx
), ntohl(p
->min_tx
) / 1000,
1100 ntohl(p
->min_rx
), ntohl(p
->min_rx
) / 1000,
1101 ntohl(p
->min_rx_echo
), ntohl(p
->min_rx_echo
) / 1000);
1102 bfd_put_details(&ds
, bfd
);
1103 VLOG(level
, "%s", ds_cstr(&ds
));
1108 bfd_set_state(struct bfd
*bfd
, enum state state
, enum diag diag
)
1111 if (bfd
->cpath_down
) {
1112 diag
= DIAG_CPATH_DOWN
;
1115 if (bfd
->state
!= state
|| bfd
->diag
!= diag
) {
1116 if (!VLOG_DROP_INFO(&rl
)) {
1117 struct ds ds
= DS_EMPTY_INITIALIZER
;
1119 ds_put_format(&ds
, "%s: BFD state change: %s->%s"
1120 " \"%s\"->\"%s\".\n",
1121 bfd
->name
, bfd_state_str(bfd
->state
),
1122 bfd_state_str(state
), bfd_diag_str(bfd
->diag
),
1123 bfd_diag_str(diag
));
1124 bfd_put_details(&ds
, bfd
);
1125 VLOG_INFO("%s", ds_cstr(&ds
));
1132 if (bfd
->state
<= STATE_DOWN
) {
1133 bfd
->rmt_state
= STATE_DOWN
;
1134 bfd
->rmt_diag
= DIAG_NONE
;
1135 bfd
->rmt_min_rx
= 1;
1138 bfd
->rmt_min_tx
= 0;
1139 /* Resets the min_rx if in_decay. */
1140 if (bfd
->in_decay
) {
1141 bfd
->min_rx
= bfd
->cfg_min_rx
;
1142 bfd
->in_decay
= false;
1145 /* Resets the decay when state changes to STATE_UP
1146 * and decay_min_rx is configured. */
1147 if (bfd
->state
== STATE_UP
&& bfd
->decay_min_rx
) {
1148 bfd_decay_update(bfd
);
1151 bfd_status_changed(bfd
);
1156 bfd_rx_packets(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1158 struct netdev_stats stats
;
1160 if (!netdev_get_stats(bfd
->netdev
, &stats
)) {
1161 return stats
.rx_packets
;
1167 /* Decays the bfd->min_rx to bfd->decay_min_rx when 'diff' is less than
1168 * the 'expect' value. */
1170 bfd_try_decay(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1172 int64_t diff
, expect
;
1174 /* The 'diff' is the difference between current interface rx_packets
1175 * stats and last-time check. The 'expect' is the recorded number of
1176 * bfd control packets received within an approximately decay_min_rx
1177 * (2000 ms if decay_min_rx is less than 2000 ms) interval.
1179 * Since the update of rx_packets stats at interface happens
1180 * asynchronously to the bfd_rx_packets() function, the 'diff' value
1181 * can be jittered. Thusly, we double the decay_rx_ctl to provide
1182 * more wiggle room. */
1183 diff
= bfd_rx_packets(bfd
) - bfd
->decay_rx_packets
;
1184 expect
= 2 * MAX(bfd
->decay_rx_ctl
, 1);
1185 bfd
->in_decay
= diff
<= expect
? true : false;
1186 bfd_decay_update(bfd
);
1189 /* Updates the rx_packets, decay_rx_ctl and decay_detect_time. */
1191 bfd_decay_update(struct bfd
* bfd
) OVS_REQUIRES(mutex
)
1193 bfd
->decay_rx_packets
= bfd_rx_packets(bfd
);
1194 bfd
->decay_rx_ctl
= 0;
1195 bfd
->decay_detect_time
= MAX(bfd
->decay_min_rx
, 2000) + time_msec();
1198 /* Records the status change and changes the global connectivity seq. */
1200 bfd_status_changed(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1202 seq_change(connectivity_seq_get());
1203 bfd
->status_changed
= true;
1207 bfd_forwarding_if_rx_update(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1209 int64_t incr
= bfd_rx_interval(bfd
) * bfd
->mult
;
1210 bfd
->forwarding_if_rx_detect_time
= MAX(incr
, 2000) + time_msec();
1214 generate_discriminator(void)
1218 /* RFC 5880 Section 6.8.1
1219 * It SHOULD be set to a random (but still unique) value to improve
1220 * security. The value is otherwise outside the scope of this
1226 /* 'disc' is by definition random, so there's no reason to waste time
1228 disc
= random_uint32();
1229 HMAP_FOR_EACH_IN_BUCKET (bfd
, node
, disc
, all_bfds
) {
1230 if (bfd
->disc
== disc
) {
1241 bfd_find_by_name(const char *name
) OVS_REQUIRES(mutex
)
1245 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1246 if (!strcmp(bfd
->name
, name
)) {
1254 bfd_put_details(struct ds
*ds
, const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1256 ds_put_format(ds
, "\tForwarding: %s\n",
1257 bfd_forwarding__(CONST_CAST(struct bfd
*, bfd
))
1258 ? "true" : "false");
1259 ds_put_format(ds
, "\tDetect Multiplier: %d\n", bfd
->mult
);
1260 ds_put_format(ds
, "\tConcatenated Path Down: %s\n",
1261 bfd
->cpath_down
? "true" : "false");
1262 ds_put_format(ds
, "\tTX Interval: Approx %lldms\n", bfd_tx_interval(bfd
));
1263 ds_put_format(ds
, "\tRX Interval: Approx %lldms\n", bfd_rx_interval(bfd
));
1264 ds_put_format(ds
, "\tDetect Time: now %+lldms\n",
1265 time_msec() - bfd
->detect_time
);
1266 ds_put_format(ds
, "\tNext TX Time: now %+lldms\n",
1267 time_msec() - bfd
->next_tx
);
1268 ds_put_format(ds
, "\tLast TX Time: now %+lldms\n",
1269 time_msec() - bfd
->last_tx
);
1271 ds_put_cstr(ds
, "\n");
1273 ds_put_format(ds
, "\tLocal Flags: %s\n", bfd_flag_str(bfd
->flags
));
1274 ds_put_format(ds
, "\tLocal Session State: %s\n",
1275 bfd_state_str(bfd
->state
));
1276 ds_put_format(ds
, "\tLocal Diagnostic: %s\n", bfd_diag_str(bfd
->diag
));
1277 ds_put_format(ds
, "\tLocal Discriminator: 0x%"PRIx32
"\n", bfd
->disc
);
1278 ds_put_format(ds
, "\tLocal Minimum TX Interval: %lldms\n",
1280 ds_put_format(ds
, "\tLocal Minimum RX Interval: %lldms\n", bfd
->min_rx
);
1282 ds_put_cstr(ds
, "\n");
1284 ds_put_format(ds
, "\tRemote Flags: %s\n", bfd_flag_str(bfd
->rmt_flags
));
1285 ds_put_format(ds
, "\tRemote Session State: %s\n",
1286 bfd_state_str(bfd
->rmt_state
));
1287 ds_put_format(ds
, "\tRemote Diagnostic: %s\n",
1288 bfd_diag_str(bfd
->rmt_diag
));
1289 ds_put_format(ds
, "\tRemote Discriminator: 0x%"PRIx32
"\n", bfd
->rmt_disc
);
1290 ds_put_format(ds
, "\tRemote Minimum TX Interval: %lldms\n",
1292 ds_put_format(ds
, "\tRemote Minimum RX Interval: %lldms\n",
1297 bfd_unixctl_show(struct unixctl_conn
*conn
, int argc
, const char *argv
[],
1298 void *aux OVS_UNUSED
) OVS_EXCLUDED(mutex
)
1300 struct ds ds
= DS_EMPTY_INITIALIZER
;
1303 ovs_mutex_lock(&mutex
);
1305 bfd
= bfd_find_by_name(argv
[1]);
1307 unixctl_command_reply_error(conn
, "no such bfd object");
1310 bfd_put_details(&ds
, bfd
);
1312 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1313 ds_put_format(&ds
, "---- %s ----\n", bfd
->name
);
1314 bfd_put_details(&ds
, bfd
);
1317 unixctl_command_reply(conn
, ds_cstr(&ds
));
1321 ovs_mutex_unlock(&mutex
);
1326 bfd_unixctl_set_forwarding_override(struct unixctl_conn
*conn
, int argc
,
1327 const char *argv
[], void *aux OVS_UNUSED
)
1330 const char *forward_str
= argv
[argc
- 1];
1331 int forwarding_override
;
1334 ovs_mutex_lock(&mutex
);
1335 if (!strcasecmp("true", forward_str
)) {
1336 forwarding_override
= 1;
1337 } else if (!strcasecmp("false", forward_str
)) {
1338 forwarding_override
= 0;
1339 } else if (!strcasecmp("normal", forward_str
)) {
1340 forwarding_override
= -1;
1342 unixctl_command_reply_error(conn
, "unknown fault string");
1347 bfd
= bfd_find_by_name(argv
[1]);
1349 unixctl_command_reply_error(conn
, "no such BFD object");
1352 bfd
->forwarding_override
= forwarding_override
;
1353 bfd_status_changed(bfd
);
1355 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1356 bfd
->forwarding_override
= forwarding_override
;
1357 bfd_status_changed(bfd
);
1361 unixctl_command_reply(conn
, "OK");
1364 ovs_mutex_unlock(&mutex
);