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"
28 #include "dynamic-string.h"
36 #include "ovs-thread.h"
37 #include "openvswitch/types.h"
39 #include "poll-loop.h"
44 #include "unaligned.h"
49 VLOG_DEFINE_THIS_MODULE(bfd
);
53 * The goal of this module is to replace CFM with something both more flexible
54 * and standards compliant. In service of this goal, the following needs to be
58 * * Implement Demand mode.
59 * * Go through the RFC line by line and verify we comply.
60 * * Test against a hardware implementation. Preferably a popular one.
61 * * Delete BFD packets with nw_ttl != 255 in the datapath to prevent DOS
66 * - Set TOS/PCP on the outer tunnel header when encapped.
68 * - Sending BFD messages should be in its own thread/process.
70 * - Scale testing. How does it operate when there are large number of bfd
71 * sessions? Do we ever have random flaps? What's the CPU utilization?
73 * - Rely on data traffic for liveness by using BFD demand mode.
74 * If we're receiving traffic on a port, we can safely assume it's up (modulo
75 * unidrectional failures). BFD has a demand mode in which it can stay quiet
76 * unless it feels the need to check the status of the port. Using this, we
77 * can implement a strategy in which BFD only sends control messages on dark
80 * - Depending on how one interprets the spec, it appears that a BFD session
81 * can never change bfd.LocalDiag to "No Diagnostic". We should verify that
82 * this is what hardware implementations actually do. Seems like "No
83 * Diagnostic" should be set once a BFD session state goes UP. */
88 FLAG_MULTIPOINT
= 1 << 0,
97 STATE_ADMIN_DOWN
= 0 << 6,
104 DIAG_NONE
= 0, /* No Diagnostic. */
105 DIAG_EXPIRED
= 1, /* Control Detection Time Expired. */
106 DIAG_ECHO_FAILED
= 2, /* Echo Function Failed. */
107 DIAG_RMT_DOWN
= 3, /* Neighbor Signaled Session Down. */
108 DIAG_FWD_RESET
= 4, /* Forwarding Plane Reset. */
109 DIAG_PATH_DOWN
= 5, /* Path Down. */
110 DIAG_CPATH_DOWN
= 6, /* Concatenated Path Down. */
111 DIAG_ADMIN_DOWN
= 7, /* Administratively Down. */
112 DIAG_RCPATH_DOWN
= 8 /* Reverse Concatenated Path Down. */
115 /* RFC 5880 Section 4.1
117 * 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
118 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
119 * |Vers | Diag |Sta|P|F|C|A|D|M| Detect Mult | Length |
120 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
121 * | My Discriminator |
122 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
123 * | Your Discriminator |
124 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
125 * | Desired Min TX Interval |
126 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
127 * | Required Min RX Interval |
128 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
129 * | Required Min Echo RX Interval |
130 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */
132 uint8_t vers_diag
; /* Version and diagnostic. */
133 uint8_t flags
; /* 2bit State field followed by flags. */
134 uint8_t mult
; /* Fault detection multiplier. */
135 uint8_t length
; /* Length of this BFD message. */
136 ovs_be32 my_disc
; /* My discriminator. */
137 ovs_be32 your_disc
; /* Your discriminator. */
138 ovs_be32 min_tx
; /* Desired minimum tx interval. */
139 ovs_be32 min_rx
; /* Required minimum rx interval. */
140 ovs_be32 min_rx_echo
; /* Required minimum echo rx interval. */
142 BUILD_ASSERT_DECL(BFD_PACKET_LEN
== sizeof(struct msg
));
144 #define DIAG_MASK 0x1f
146 #define STATE_MASK 0xC0
147 #define FLAGS_MASK 0x3f
150 struct hmap_node node
; /* In 'all_bfds'. */
151 uint32_t disc
; /* bfd.LocalDiscr. Key in 'all_bfds' hmap. */
153 char *name
; /* Name used for logging. */
155 bool cpath_down
; /* Concatenated Path Down. */
156 uint8_t mult
; /* bfd.DetectMult. */
158 struct netdev
*netdev
;
159 uint64_t rx_packets
; /* Packets received by 'netdev'. */
161 enum state state
; /* bfd.SessionState. */
162 enum state rmt_state
; /* bfd.RemoteSessionState. */
164 enum diag diag
; /* bfd.LocalDiag. */
165 enum diag rmt_diag
; /* Remote diagnostic. */
167 enum flags flags
; /* Flags sent on messages. */
168 enum flags rmt_flags
; /* Flags last received. */
170 uint32_t rmt_disc
; /* bfd.RemoteDiscr. */
172 uint8_t eth_dst
[ETH_ADDR_LEN
];/* Ethernet destination address. */
173 bool eth_dst_set
; /* 'eth_dst' set through database. */
175 ovs_be32 ip_src
; /* IPv4 source address. */
176 ovs_be32 ip_dst
; /* IPv4 destination address. */
178 uint16_t udp_src
; /* UDP source port. */
180 /* All timers in milliseconds. */
181 long long int rmt_min_rx
; /* bfd.RemoteMinRxInterval. */
182 long long int rmt_min_tx
; /* Remote minimum TX interval. */
184 long long int cfg_min_tx
; /* Configured minimum TX rate. */
185 long long int cfg_min_rx
; /* Configured required minimum RX rate. */
186 long long int poll_min_tx
; /* Min TX negotating in a poll sequence. */
187 long long int poll_min_rx
; /* Min RX negotating in a poll sequence. */
188 long long int min_tx
; /* bfd.DesiredMinTxInterval. */
189 long long int min_rx
; /* bfd.RequiredMinRxInterval. */
191 long long int last_tx
; /* Last TX time. */
192 long long int next_tx
; /* Next TX time. */
193 long long int detect_time
; /* RFC 5880 6.8.4 Detection time. */
195 bool last_forwarding
; /* Last calculation of forwarding flag. */
196 int forwarding_override
; /* Manual override of 'forwarding' status. */
198 atomic_bool check_tnl_key
; /* Verify tunnel key of inbound packets? */
199 struct ovs_refcount ref_cnt
;
201 /* When forward_if_rx is true, bfd_forwarding() will return
202 * true as long as there are incoming packets received.
203 * Note, forwarding_override still has higher priority. */
204 bool forwarding_if_rx
;
205 long long int forwarding_if_rx_detect_time
;
207 /* When 'bfd->forwarding_if_rx' is set, at least one bfd control packet
208 * is required to be received every 100 * bfd->cfg_min_rx. If bfd
209 * control packet is not received within this interval, even if data
210 * packets are received, the bfd->forwarding will still be false. */
211 long long int demand_rx_bfd_time
;
213 /* BFD decay related variables. */
214 bool in_decay
; /* True when bfd is in decay. */
215 int decay_min_rx
; /* min_rx is set to decay_min_rx when */
217 int decay_rx_ctl
; /* Count bfd packets received within decay */
218 /* detect interval. */
219 uint64_t decay_rx_packets
; /* Packets received by 'netdev'. */
220 long long int decay_detect_time
; /* Decay detection time. */
222 uint64_t flap_count
; /* Counts bfd forwarding flaps. */
224 /* True when the variables returned by bfd_get_status() are changed
225 * since last check. */
229 static struct ovs_mutex mutex
= OVS_MUTEX_INITIALIZER
;
230 static struct hmap all_bfds__
= HMAP_INITIALIZER(&all_bfds__
);
231 static struct hmap
*const all_bfds
OVS_GUARDED_BY(mutex
) = &all_bfds__
;
233 static bool bfd_lookup_ip(const char *host_name
, struct in_addr
*)
235 static bool bfd_forwarding__(struct bfd
*) OVS_REQUIRES(mutex
);
236 static bool bfd_in_poll(const struct bfd
*) OVS_REQUIRES(mutex
);
237 static void bfd_poll(struct bfd
*bfd
) OVS_REQUIRES(mutex
);
238 static const char *bfd_diag_str(enum diag
) OVS_REQUIRES(mutex
);
239 static const char *bfd_state_str(enum state
) OVS_REQUIRES(mutex
);
240 static long long int bfd_min_tx(const struct bfd
*) OVS_REQUIRES(mutex
);
241 static long long int bfd_tx_interval(const struct bfd
*)
243 static long long int bfd_rx_interval(const struct bfd
*)
245 static void bfd_set_next_tx(struct bfd
*) OVS_REQUIRES(mutex
);
246 static void bfd_set_state(struct bfd
*, enum state
, enum diag
)
248 static uint32_t generate_discriminator(void) OVS_REQUIRES(mutex
);
249 static void bfd_put_details(struct ds
*, const struct bfd
*)
251 static uint64_t bfd_rx_packets(const struct bfd
*) OVS_REQUIRES(mutex
);
252 static void bfd_try_decay(struct bfd
*) OVS_REQUIRES(mutex
);
253 static void bfd_decay_update(struct bfd
*) OVS_REQUIRES(mutex
);
254 static void bfd_status_changed(struct bfd
*) OVS_REQUIRES(mutex
);
256 static void bfd_forwarding_if_rx_update(struct bfd
*) OVS_REQUIRES(mutex
);
257 static void bfd_unixctl_show(struct unixctl_conn
*, int argc
,
258 const char *argv
[], void *aux OVS_UNUSED
);
259 static void bfd_unixctl_set_forwarding_override(struct unixctl_conn
*,
260 int argc
, const char *argv
[],
261 void *aux OVS_UNUSED
);
262 static void log_msg(enum vlog_level
, const struct msg
*, const char *message
,
263 const struct bfd
*) OVS_REQUIRES(mutex
);
265 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(20, 20);
267 /* Returns true if the interface on which 'bfd' is running may be used to
268 * forward traffic according to the BFD session state. */
270 bfd_forwarding(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
274 ovs_mutex_lock(&mutex
);
275 ret
= bfd_forwarding__(bfd
);
276 ovs_mutex_unlock(&mutex
);
280 /* When forwarding_if_rx is enabled, if there are packets received,
281 * updates forwarding_if_rx_detect_time. */
283 bfd_account_rx(struct bfd
*bfd
, const struct dpif_flow_stats
*stats
)
285 if (stats
->n_packets
&& bfd
->forwarding_if_rx
) {
286 ovs_mutex_lock(&mutex
);
287 bfd_forwarding__(bfd
);
288 bfd_forwarding_if_rx_update(bfd
);
289 bfd_forwarding__(bfd
);
290 ovs_mutex_unlock(&mutex
);
294 /* Returns and resets the 'bfd->status_changed'. */
296 bfd_check_status_change(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
300 ovs_mutex_lock(&mutex
);
301 ret
= bfd
->status_changed
;
302 bfd
->status_changed
= false;
303 ovs_mutex_unlock(&mutex
);
308 /* Returns a 'smap' of key value pairs representing the status of 'bfd'
309 * intended for the OVS database. */
311 bfd_get_status(const struct bfd
*bfd
, struct smap
*smap
)
314 ovs_mutex_lock(&mutex
);
315 smap_add(smap
, "forwarding",
316 bfd_forwarding__(CONST_CAST(struct bfd
*, bfd
))
318 smap_add(smap
, "state", bfd_state_str(bfd
->state
));
319 smap_add(smap
, "diagnostic", bfd_diag_str(bfd
->diag
));
320 smap_add_format(smap
, "flap_count", "%"PRIu64
, bfd
->flap_count
);
322 if (bfd
->state
!= STATE_DOWN
) {
323 smap_add(smap
, "remote_state", bfd_state_str(bfd
->rmt_state
));
324 smap_add(smap
, "remote_diagnostic", bfd_diag_str(bfd
->rmt_diag
));
326 ovs_mutex_unlock(&mutex
);
329 /* Initializes, destroys, or reconfigures the BFD session 'bfd' (named 'name'),
330 * according to the database configuration contained in 'cfg'. Takes ownership
331 * of 'bfd', which may be NULL. Returns a BFD object which may be used as a
332 * handle for the session, or NULL if BFD is not enabled according to 'cfg'.
333 * Also returns NULL if cfg is NULL. */
335 bfd_configure(struct bfd
*bfd
, const char *name
, const struct smap
*cfg
,
336 struct netdev
*netdev
) OVS_EXCLUDED(mutex
)
338 static struct ovsthread_once once
= OVSTHREAD_ONCE_INITIALIZER
;
339 static atomic_uint16_t udp_src
= ATOMIC_VAR_INIT(0);
342 long long int min_tx
, min_rx
;
343 bool need_poll
= false;
344 bool cfg_min_rx_changed
= false;
345 bool cpath_down
, forwarding_if_rx
;
346 const char *hwaddr
, *ip_src
, *ip_dst
;
347 struct in_addr in_addr
;
348 uint8_t ea
[ETH_ADDR_LEN
];
350 if (ovsthread_once_start(&once
)) {
351 unixctl_command_register("bfd/show", "[interface]", 0, 1,
352 bfd_unixctl_show
, NULL
);
353 unixctl_command_register("bfd/set-forwarding",
354 "[interface] normal|false|true", 1, 2,
355 bfd_unixctl_set_forwarding_override
, NULL
);
356 ovsthread_once_done(&once
);
359 if (!cfg
|| !smap_get_bool(cfg
, "enable", false)) {
364 ovs_mutex_lock(&mutex
);
366 bfd
= xzalloc(sizeof *bfd
);
367 bfd
->name
= xstrdup(name
);
368 bfd
->forwarding_override
= -1;
369 bfd
->disc
= generate_discriminator();
370 hmap_insert(all_bfds
, &bfd
->node
, bfd
->disc
);
372 bfd
->diag
= DIAG_NONE
;
375 ovs_refcount_init(&bfd
->ref_cnt
);
376 bfd
->netdev
= netdev_ref(netdev
);
377 bfd
->rx_packets
= bfd_rx_packets(bfd
);
378 bfd
->in_decay
= false;
381 /* RFC 5881 section 4
382 * The source port MUST be in the range 49152 through 65535. The same
383 * UDP source port number MUST be used for all BFD Control packets
384 * associated with a particular session. The source port number SHOULD
385 * be unique among all BFD sessions on the system. */
386 atomic_add(&udp_src
, 1, &bfd
->udp_src
);
387 bfd
->udp_src
= (bfd
->udp_src
% 16384) + 49152;
389 bfd_set_state(bfd
, STATE_DOWN
, DIAG_NONE
);
391 memcpy(bfd
->eth_dst
, eth_addr_bfd
, ETH_ADDR_LEN
);
393 bfd_status_changed(bfd
);
396 atomic_store(&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
, 100);
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
, 100);
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_dst_mac");
444 if (hwaddr
&& eth_addr_from_string(hwaddr
, ea
) && !eth_addr_is_zero(ea
)) {
445 memcpy(bfd
->eth_dst
, ea
, ETH_ADDR_LEN
);
446 bfd
->eth_dst_set
= true;
447 } else if (bfd
->eth_dst_set
) {
448 memcpy(bfd
->eth_dst
, eth_addr_bfd
, ETH_ADDR_LEN
);
449 bfd
->eth_dst_set
= false;
452 ip_src
= smap_get(cfg
, "bfd_src_ip");
453 if (ip_src
&& bfd_lookup_ip(ip_src
, &in_addr
)) {
454 memcpy(&bfd
->ip_src
, &in_addr
, sizeof in_addr
);
456 bfd
->ip_src
= htonl(0xA9FE0101); /* 169.254.1.1. */
459 ip_dst
= smap_get(cfg
, "bfd_dst_ip");
460 if (ip_dst
&& bfd_lookup_ip(ip_dst
, &in_addr
)) {
461 memcpy(&bfd
->ip_dst
, &in_addr
, sizeof in_addr
);
463 bfd
->ip_dst
= htonl(0xA9FE0100); /* 169.254.1.0. */
466 forwarding_if_rx
= smap_get_bool(cfg
, "forwarding_if_rx", false);
467 if (bfd
->forwarding_if_rx
!= forwarding_if_rx
) {
468 bfd
->forwarding_if_rx
= forwarding_if_rx
;
469 if (bfd
->state
== STATE_UP
&& bfd
->forwarding_if_rx
) {
470 bfd_forwarding_if_rx_update(bfd
);
472 bfd
->forwarding_if_rx_detect_time
= 0;
479 ovs_mutex_unlock(&mutex
);
484 bfd_ref(const struct bfd
*bfd_
)
486 struct bfd
*bfd
= CONST_CAST(struct bfd
*, bfd_
);
488 ovs_refcount_ref(&bfd
->ref_cnt
);
494 bfd_unref(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
496 if (bfd
&& ovs_refcount_unref_relaxed(&bfd
->ref_cnt
) == 1) {
497 ovs_mutex_lock(&mutex
);
498 bfd_status_changed(bfd
);
499 hmap_remove(all_bfds
, &bfd
->node
);
500 netdev_close(bfd
->netdev
);
503 ovs_mutex_unlock(&mutex
);
508 bfd_wait(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
510 poll_timer_wait_until(bfd_wake_time(bfd
));
513 /* Returns the next wake up time. */
515 bfd_wake_time(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
517 long long int retval
;
523 ovs_mutex_lock(&mutex
);
524 if (bfd
->flags
& FLAG_FINAL
) {
527 retval
= bfd
->next_tx
;
528 if (bfd
->state
> STATE_DOWN
) {
529 retval
= MIN(bfd
->detect_time
, retval
);
532 ovs_mutex_unlock(&mutex
);
537 bfd_run(struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
542 ovs_mutex_lock(&mutex
);
544 old_in_decay
= bfd
->in_decay
;
546 if (bfd
->state
> STATE_DOWN
&& now
>= bfd
->detect_time
) {
547 bfd_set_state(bfd
, STATE_DOWN
, DIAG_EXPIRED
);
549 bfd_forwarding__(bfd
);
551 /* Decay may only happen when state is STATE_UP, bfd->decay_min_rx is
552 * configured, and decay_detect_time is reached. */
553 if (bfd
->state
== STATE_UP
&& bfd
->decay_min_rx
> 0
554 && now
>= bfd
->decay_detect_time
) {
558 if (bfd
->min_tx
!= bfd
->cfg_min_tx
559 || (bfd
->min_rx
!= bfd
->cfg_min_rx
&& bfd
->min_rx
!= bfd
->decay_min_rx
)
560 || bfd
->in_decay
!= old_in_decay
) {
563 ovs_mutex_unlock(&mutex
);
567 bfd_should_send_packet(const struct bfd
*bfd
) OVS_EXCLUDED(mutex
)
570 ovs_mutex_lock(&mutex
);
571 ret
= bfd
->flags
& FLAG_FINAL
|| time_msec() >= bfd
->next_tx
;
572 ovs_mutex_unlock(&mutex
);
577 bfd_put_packet(struct bfd
*bfd
, struct ofpbuf
*p
,
578 uint8_t eth_src
[ETH_ADDR_LEN
]) OVS_EXCLUDED(mutex
)
580 long long int min_tx
, min_rx
;
581 struct udp_header
*udp
;
582 struct eth_header
*eth
;
583 struct ip_header
*ip
;
586 ovs_mutex_lock(&mutex
);
588 long long int delay
= time_msec() - bfd
->next_tx
;
589 long long int interval
= bfd_tx_interval(bfd
);
590 if (delay
> interval
* 3 / 2) {
591 VLOG_INFO("%s: long delay of %lldms (expected %lldms) sending BFD"
592 " control message", bfd
->name
, delay
, interval
);
596 /* RFC 5880 Section 6.5
597 * A BFD Control packet MUST NOT have both the Poll (P) and Final (F) bits
599 ovs_assert(!(bfd
->flags
& FLAG_POLL
) || !(bfd
->flags
& FLAG_FINAL
));
601 ofpbuf_reserve(p
, 2); /* Properly align after the ethernet header. */
602 eth
= ofpbuf_put_uninit(p
, sizeof *eth
);
603 memcpy(eth
->eth_src
, eth_src
, ETH_ADDR_LEN
);
604 memcpy(eth
->eth_dst
, bfd
->eth_dst
, ETH_ADDR_LEN
);
605 eth
->eth_type
= htons(ETH_TYPE_IP
);
607 ip
= ofpbuf_put_zeros(p
, sizeof *ip
);
608 ip
->ip_ihl_ver
= IP_IHL_VER(5, 4);
609 ip
->ip_tot_len
= htons(sizeof *ip
+ sizeof *udp
+ sizeof *msg
);
611 ip
->ip_tos
= IPTOS_LOWDELAY
| IPTOS_THROUGHPUT
;
612 ip
->ip_proto
= IPPROTO_UDP
;
613 put_16aligned_be32(&ip
->ip_src
, bfd
->ip_src
);
614 put_16aligned_be32(&ip
->ip_dst
, bfd
->ip_dst
);
615 ip
->ip_csum
= csum(ip
, sizeof *ip
);
617 udp
= ofpbuf_put_zeros(p
, sizeof *udp
);
618 udp
->udp_src
= htons(bfd
->udp_src
);
619 udp
->udp_dst
= htons(BFD_DEST_PORT
);
620 udp
->udp_len
= htons(sizeof *udp
+ sizeof *msg
);
622 msg
= ofpbuf_put_uninit(p
, sizeof *msg
);
623 msg
->vers_diag
= (BFD_VERSION
<< 5) | bfd
->diag
;
624 msg
->flags
= (bfd
->state
& STATE_MASK
) | bfd
->flags
;
626 msg
->mult
= bfd
->mult
;
627 msg
->length
= BFD_PACKET_LEN
;
628 msg
->my_disc
= htonl(bfd
->disc
);
629 msg
->your_disc
= htonl(bfd
->rmt_disc
);
630 msg
->min_rx_echo
= htonl(0);
632 if (bfd_in_poll(bfd
)) {
633 min_tx
= bfd
->poll_min_tx
;
634 min_rx
= bfd
->poll_min_rx
;
636 min_tx
= bfd_min_tx(bfd
);
637 min_rx
= bfd
->min_rx
;
640 msg
->min_tx
= htonl(min_tx
* 1000);
641 msg
->min_rx
= htonl(min_rx
* 1000);
643 bfd
->flags
&= ~FLAG_FINAL
;
645 log_msg(VLL_DBG
, msg
, "Sending BFD Message", bfd
);
647 bfd
->last_tx
= time_msec();
648 bfd_set_next_tx(bfd
);
649 ovs_mutex_unlock(&mutex
);
653 bfd_should_process_flow(const struct bfd
*bfd_
, const struct flow
*flow
,
654 struct flow_wildcards
*wc
)
656 struct bfd
*bfd
= CONST_CAST(struct bfd
*, bfd_
);
659 memset(&wc
->masks
.dl_dst
, 0xff, sizeof wc
->masks
.dl_dst
);
660 if (bfd
->eth_dst_set
&& memcmp(bfd
->eth_dst
, flow
->dl_dst
, ETH_ADDR_LEN
)) {
664 memset(&wc
->masks
.nw_proto
, 0xff, sizeof wc
->masks
.nw_proto
);
665 memset(&wc
->masks
.tp_dst
, 0xff, sizeof wc
->masks
.tp_dst
);
667 atomic_read(&bfd
->check_tnl_key
, &check_tnl_key
);
669 memset(&wc
->masks
.tunnel
.tun_id
, 0xff, sizeof wc
->masks
.tunnel
.tun_id
);
671 return (flow
->dl_type
== htons(ETH_TYPE_IP
)
672 && flow
->nw_proto
== IPPROTO_UDP
673 && flow
->tp_dst
== htons(BFD_DEST_PORT
)
674 && (!check_tnl_key
|| flow
->tunnel
.tun_id
== htonll(0)));
678 bfd_process_packet(struct bfd
*bfd
, const struct flow
*flow
,
679 const struct ofpbuf
*p
) OVS_EXCLUDED(mutex
)
681 uint32_t rmt_min_rx
, pkt_your_disc
;
682 enum state rmt_state
;
686 const uint8_t *l7
= ofpbuf_get_udp_payload(p
);
689 return; /* No UDP payload. */
692 /* This function is designed to follow section RFC 5880 6.8.6 closely. */
694 ovs_mutex_lock(&mutex
);
695 /* Increments the decay rx counter. */
698 bfd_forwarding__(bfd
);
700 if (flow
->nw_ttl
!= 255) {
701 /* XXX Should drop in the kernel to prevent DOS. */
705 msg
= ofpbuf_at(p
, l7
- (uint8_t *)ofpbuf_data(p
), BFD_PACKET_LEN
);
707 VLOG_INFO_RL(&rl
, "%s: Received too-short BFD control message (only "
708 "%"PRIdPTR
" bytes long, at least %d required).",
709 bfd
->name
, (uint8_t *) ofpbuf_tail(p
) - l7
,
714 /* RFC 5880 Section 6.8.6
715 * If the Length field is greater than the payload of the encapsulating
716 * protocol, the packet MUST be discarded.
718 * Note that we make this check implicity. Above we use ofpbuf_at() to
719 * ensure that there are at least BFD_PACKET_LEN bytes in the payload of
720 * the encapsulating protocol. Below we require msg->length to be exactly
721 * BFD_PACKET_LEN bytes. */
723 flags
= msg
->flags
& FLAGS_MASK
;
724 rmt_state
= msg
->flags
& STATE_MASK
;
725 version
= msg
->vers_diag
>> VERS_SHIFT
;
727 log_msg(VLL_DBG
, msg
, "Received BFD control message", bfd
);
729 if (version
!= BFD_VERSION
) {
730 log_msg(VLL_WARN
, msg
, "Incorrect version", bfd
);
734 /* Technically this should happen after the length check. We don't support
735 * authentication however, so it's simpler to do the check first. */
736 if (flags
& FLAG_AUTH
) {
737 log_msg(VLL_WARN
, msg
, "Authenticated control message with"
738 " authentication disabled", bfd
);
742 if (msg
->length
!= BFD_PACKET_LEN
) {
743 log_msg(VLL_WARN
, msg
, "Unexpected length", bfd
);
744 if (msg
->length
< BFD_PACKET_LEN
) {
750 log_msg(VLL_WARN
, msg
, "Zero multiplier", bfd
);
754 if (flags
& FLAG_MULTIPOINT
) {
755 log_msg(VLL_WARN
, msg
, "Unsupported multipoint flag", bfd
);
760 log_msg(VLL_WARN
, msg
, "NULL my_disc", bfd
);
764 pkt_your_disc
= ntohl(msg
->your_disc
);
766 /* Technically, we should use the your discriminator field to figure
767 * out which 'struct bfd' this packet is destined towards. That way a
768 * bfd session could migrate from one interface to another
769 * transparently. This doesn't fit in with the OVS structure very
770 * well, so in this respect, we are not compliant. */
771 if (pkt_your_disc
!= bfd
->disc
) {
772 log_msg(VLL_WARN
, msg
, "Incorrect your_disc", bfd
);
775 } else if (rmt_state
> STATE_DOWN
) {
776 log_msg(VLL_WARN
, msg
, "Null your_disc", bfd
);
780 if (bfd
->rmt_state
!= rmt_state
) {
781 bfd_status_changed(bfd
);
784 bfd
->rmt_disc
= ntohl(msg
->my_disc
);
785 bfd
->rmt_state
= rmt_state
;
786 bfd
->rmt_flags
= flags
;
787 bfd
->rmt_diag
= msg
->vers_diag
& DIAG_MASK
;
789 if (flags
& FLAG_FINAL
&& bfd_in_poll(bfd
)) {
790 bfd
->min_tx
= bfd
->poll_min_tx
;
791 bfd
->min_rx
= bfd
->poll_min_rx
;
792 bfd
->flags
&= ~FLAG_POLL
;
793 log_msg(VLL_INFO
, msg
, "Poll sequence terminated", bfd
);
796 if (flags
& FLAG_POLL
) {
797 /* RFC 5880 Section 6.5
798 * When the other system receives a Poll, it immediately transmits a
799 * BFD Control packet with the Final (F) bit set, independent of any
800 * periodic BFD Control packets it may be sending
801 * (see section 6.8.7). */
802 bfd
->flags
&= ~FLAG_POLL
;
803 bfd
->flags
|= FLAG_FINAL
;
806 rmt_min_rx
= MAX(ntohl(msg
->min_rx
) / 1000, 1);
807 if (bfd
->rmt_min_rx
!= rmt_min_rx
) {
808 bfd
->rmt_min_rx
= rmt_min_rx
;
810 bfd_set_next_tx(bfd
);
812 log_msg(VLL_INFO
, msg
, "New remote min_rx", bfd
);
815 bfd
->rmt_min_tx
= MAX(ntohl(msg
->min_tx
) / 1000, 1);
816 bfd
->detect_time
= bfd_rx_interval(bfd
) * bfd
->mult
+ time_msec();
818 if (bfd
->state
== STATE_ADMIN_DOWN
) {
819 VLOG_DBG_RL(&rl
, "Administratively down, dropping control message.");
823 if (rmt_state
== STATE_ADMIN_DOWN
) {
824 if (bfd
->state
!= STATE_DOWN
) {
825 bfd_set_state(bfd
, STATE_DOWN
, DIAG_RMT_DOWN
);
828 switch (bfd
->state
) {
830 if (rmt_state
== STATE_DOWN
) {
831 bfd_set_state(bfd
, STATE_INIT
, bfd
->diag
);
832 } else if (rmt_state
== STATE_INIT
) {
833 bfd_set_state(bfd
, STATE_UP
, bfd
->diag
);
837 if (rmt_state
> STATE_DOWN
) {
838 bfd_set_state(bfd
, STATE_UP
, bfd
->diag
);
842 if (rmt_state
<= STATE_DOWN
) {
843 bfd_set_state(bfd
, STATE_DOWN
, DIAG_RMT_DOWN
);
844 log_msg(VLL_INFO
, msg
, "Remote signaled STATE_DOWN", bfd
);
847 case STATE_ADMIN_DOWN
:
852 /* XXX: RFC 5880 Section 6.8.6 Demand mode related calculations here. */
854 if (bfd
->forwarding_if_rx
) {
855 bfd
->demand_rx_bfd_time
= time_msec() + 100 * bfd
->cfg_min_rx
;
859 bfd_forwarding__(bfd
);
860 ovs_mutex_unlock(&mutex
);
863 /* Must be called when the netdev owned by 'bfd' should change. */
865 bfd_set_netdev(struct bfd
*bfd
, const struct netdev
*netdev
)
868 ovs_mutex_lock(&mutex
);
869 if (bfd
->netdev
!= netdev
) {
870 netdev_close(bfd
->netdev
);
871 bfd
->netdev
= netdev_ref(netdev
);
872 if (bfd
->decay_min_rx
&& bfd
->state
== STATE_UP
) {
873 bfd_decay_update(bfd
);
875 if (bfd
->forwarding_if_rx
&& bfd
->state
== STATE_UP
) {
876 bfd_forwarding_if_rx_update(bfd
);
878 bfd
->rx_packets
= bfd_rx_packets(bfd
);
880 ovs_mutex_unlock(&mutex
);
884 /* Updates the forwarding flag. If override is not configured and
885 * the forwarding flag value changes, increments the flap count.
887 * Note this function may be called multiple times in a function
888 * (e.g. bfd_account_rx) before and after the bfd state or status
889 * change. This is to capture any forwarding flag flap. */
891 bfd_forwarding__(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
893 long long int now
= time_msec();
894 bool forwarding_if_rx
;
895 bool last_forwarding
= bfd
->last_forwarding
;
897 if (bfd
->forwarding_override
!= -1) {
898 return bfd
->forwarding_override
== 1;
901 forwarding_if_rx
= bfd
->forwarding_if_rx
902 && bfd
->forwarding_if_rx_detect_time
> now
903 && bfd
->demand_rx_bfd_time
> now
;
905 bfd
->last_forwarding
= (bfd
->state
== STATE_UP
|| forwarding_if_rx
)
906 && bfd
->rmt_diag
!= DIAG_PATH_DOWN
907 && bfd
->rmt_diag
!= DIAG_CPATH_DOWN
908 && bfd
->rmt_diag
!= DIAG_RCPATH_DOWN
;
909 if (bfd
->last_forwarding
!= last_forwarding
) {
911 bfd_status_changed(bfd
);
913 return bfd
->last_forwarding
;
918 bfd_lookup_ip(const char *host_name
, struct in_addr
*addr
)
920 if (!inet_pton(AF_INET
, host_name
, addr
)) {
921 VLOG_ERR_RL(&rl
, "\"%s\" is not a valid IP address", host_name
);
928 bfd_in_poll(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
930 return (bfd
->flags
& FLAG_POLL
) != 0;
934 bfd_poll(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
936 if (bfd
->state
> STATE_DOWN
&& !bfd_in_poll(bfd
)
937 && !(bfd
->flags
& FLAG_FINAL
)) {
938 bfd
->poll_min_tx
= bfd
->cfg_min_tx
;
939 bfd
->poll_min_rx
= bfd
->in_decay
? bfd
->decay_min_rx
: bfd
->cfg_min_rx
;
940 bfd
->flags
|= FLAG_POLL
;
942 VLOG_INFO_RL(&rl
, "%s: Initiating poll sequence", bfd
->name
);
947 bfd_min_tx(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
949 /* RFC 5880 Section 6.8.3
950 * When bfd.SessionState is not Up, the system MUST set
951 * bfd.DesiredMinTxInterval to a value of not less than one second
952 * (1,000,000 microseconds). This is intended to ensure that the
953 * bandwidth consumed by BFD sessions that are not Up is negligible,
954 * particularly in the case where a neighbor may not be running BFD. */
955 return (bfd
->state
== STATE_UP
? bfd
->min_tx
: MAX(bfd
->min_tx
, 1000));
959 bfd_tx_interval(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
961 long long int interval
= bfd_min_tx(bfd
);
962 return MAX(interval
, bfd
->rmt_min_rx
);
966 bfd_rx_interval(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
968 return MAX(bfd
->min_rx
, bfd
->rmt_min_tx
);
972 bfd_set_next_tx(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
974 long long int interval
= bfd_tx_interval(bfd
);
975 interval
-= interval
* random_range(26) / 100;
976 bfd
->next_tx
= bfd
->last_tx
+ interval
;
980 bfd_flag_str(enum flags flags
)
982 struct ds ds
= DS_EMPTY_INITIALIZER
;
983 static char flag_str
[128];
989 if (flags
& FLAG_MULTIPOINT
) {
990 ds_put_cstr(&ds
, "multipoint ");
993 if (flags
& FLAG_DEMAND
) {
994 ds_put_cstr(&ds
, "demand ");
997 if (flags
& FLAG_AUTH
) {
998 ds_put_cstr(&ds
, "auth ");
1001 if (flags
& FLAG_CTL
) {
1002 ds_put_cstr(&ds
, "ctl ");
1005 if (flags
& FLAG_FINAL
) {
1006 ds_put_cstr(&ds
, "final ");
1009 if (flags
& FLAG_POLL
) {
1010 ds_put_cstr(&ds
, "poll ");
1013 /* Do not copy the trailing whitespace. */
1015 ovs_strlcpy(flag_str
, ds_cstr(&ds
), sizeof flag_str
);
1021 bfd_state_str(enum state state
)
1024 case STATE_ADMIN_DOWN
: return "admin_down";
1025 case STATE_DOWN
: return "down";
1026 case STATE_INIT
: return "init";
1027 case STATE_UP
: return "up";
1028 default: return "invalid";
1033 bfd_diag_str(enum diag diag
) {
1035 case DIAG_NONE
: return "No Diagnostic";
1036 case DIAG_EXPIRED
: return "Control Detection Time Expired";
1037 case DIAG_ECHO_FAILED
: return "Echo Function Failed";
1038 case DIAG_RMT_DOWN
: return "Neighbor Signaled Session Down";
1039 case DIAG_FWD_RESET
: return "Forwarding Plane Reset";
1040 case DIAG_PATH_DOWN
: return "Path Down";
1041 case DIAG_CPATH_DOWN
: return "Concatenated Path Down";
1042 case DIAG_ADMIN_DOWN
: return "Administratively Down";
1043 case DIAG_RCPATH_DOWN
: return "Reverse Concatenated Path Down";
1044 default: return "Invalid Diagnostic";
1049 log_msg(enum vlog_level level
, const struct msg
*p
, const char *message
,
1050 const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1052 struct ds ds
= DS_EMPTY_INITIALIZER
;
1054 if (vlog_should_drop(THIS_MODULE
, level
, &rl
)) {
1060 "\n\tvers:%"PRIu8
" diag:\"%s\" state:%s mult:%"PRIu8
1063 "\n\tmy_disc:0x%"PRIx32
" your_disc:0x%"PRIx32
1064 "\n\tmin_tx:%"PRIu32
"us (%"PRIu32
"ms)"
1065 "\n\tmin_rx:%"PRIu32
"us (%"PRIu32
"ms)"
1066 "\n\tmin_rx_echo:%"PRIu32
"us (%"PRIu32
"ms)",
1067 bfd
->name
, message
, p
->vers_diag
>> VERS_SHIFT
,
1068 bfd_diag_str(p
->vers_diag
& DIAG_MASK
),
1069 bfd_state_str(p
->flags
& STATE_MASK
),
1070 p
->mult
, p
->length
, bfd_flag_str(p
->flags
& FLAGS_MASK
),
1071 ntohl(p
->my_disc
), ntohl(p
->your_disc
),
1072 ntohl(p
->min_tx
), ntohl(p
->min_tx
) / 1000,
1073 ntohl(p
->min_rx
), ntohl(p
->min_rx
) / 1000,
1074 ntohl(p
->min_rx_echo
), ntohl(p
->min_rx_echo
) / 1000);
1075 bfd_put_details(&ds
, bfd
);
1076 VLOG(level
, "%s", ds_cstr(&ds
));
1081 bfd_set_state(struct bfd
*bfd
, enum state state
, enum diag diag
)
1084 if (bfd
->cpath_down
) {
1085 diag
= DIAG_CPATH_DOWN
;
1088 if (bfd
->state
!= state
|| bfd
->diag
!= diag
) {
1089 if (!VLOG_DROP_INFO(&rl
)) {
1090 struct ds ds
= DS_EMPTY_INITIALIZER
;
1092 ds_put_format(&ds
, "%s: BFD state change: %s->%s"
1093 " \"%s\"->\"%s\".\n",
1094 bfd
->name
, bfd_state_str(bfd
->state
),
1095 bfd_state_str(state
), bfd_diag_str(bfd
->diag
),
1096 bfd_diag_str(diag
));
1097 bfd_put_details(&ds
, bfd
);
1098 VLOG_INFO("%s", ds_cstr(&ds
));
1105 if (bfd
->state
<= STATE_DOWN
) {
1106 bfd
->rmt_state
= STATE_DOWN
;
1107 bfd
->rmt_diag
= DIAG_NONE
;
1108 bfd
->rmt_min_rx
= 1;
1111 bfd
->rmt_min_tx
= 0;
1112 /* Resets the min_rx if in_decay. */
1113 if (bfd
->in_decay
) {
1114 bfd
->min_rx
= bfd
->cfg_min_rx
;
1115 bfd
->in_decay
= false;
1118 /* Resets the decay when state changes to STATE_UP
1119 * and decay_min_rx is configured. */
1120 if (bfd
->state
== STATE_UP
&& bfd
->decay_min_rx
) {
1121 bfd_decay_update(bfd
);
1124 bfd_status_changed(bfd
);
1129 bfd_rx_packets(const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1131 struct netdev_stats stats
;
1133 if (!netdev_get_stats(bfd
->netdev
, &stats
)) {
1134 return stats
.rx_packets
;
1140 /* Decays the bfd->min_rx to bfd->decay_min_rx when 'diff' is less than
1141 * the 'expect' value. */
1143 bfd_try_decay(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1145 int64_t diff
, expect
;
1147 /* The 'diff' is the difference between current interface rx_packets
1148 * stats and last-time check. The 'expect' is the recorded number of
1149 * bfd control packets received within an approximately decay_min_rx
1150 * (2000 ms if decay_min_rx is less than 2000 ms) interval.
1152 * Since the update of rx_packets stats at interface happens
1153 * asynchronously to the bfd_rx_packets() function, the 'diff' value
1154 * can be jittered. Thusly, we double the decay_rx_ctl to provide
1155 * more wiggle room. */
1156 diff
= bfd_rx_packets(bfd
) - bfd
->decay_rx_packets
;
1157 expect
= 2 * MAX(bfd
->decay_rx_ctl
, 1);
1158 bfd
->in_decay
= diff
<= expect
? true : false;
1159 bfd_decay_update(bfd
);
1162 /* Updates the rx_packets, decay_rx_ctl and decay_detect_time. */
1164 bfd_decay_update(struct bfd
* bfd
) OVS_REQUIRES(mutex
)
1166 bfd
->decay_rx_packets
= bfd_rx_packets(bfd
);
1167 bfd
->decay_rx_ctl
= 0;
1168 bfd
->decay_detect_time
= MAX(bfd
->decay_min_rx
, 2000) + time_msec();
1171 /* Records the status change and changes the global connectivity seq. */
1173 bfd_status_changed(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1175 seq_change(connectivity_seq_get());
1176 bfd
->status_changed
= true;
1180 bfd_forwarding_if_rx_update(struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1182 int64_t incr
= bfd_rx_interval(bfd
) * bfd
->mult
;
1183 bfd
->forwarding_if_rx_detect_time
= MAX(incr
, 2000) + time_msec();
1187 generate_discriminator(void)
1191 /* RFC 5880 Section 6.8.1
1192 * It SHOULD be set to a random (but still unique) value to improve
1193 * security. The value is otherwise outside the scope of this
1199 /* 'disc' is by definition random, so there's no reason to waste time
1201 disc
= random_uint32();
1202 HMAP_FOR_EACH_IN_BUCKET (bfd
, node
, disc
, all_bfds
) {
1203 if (bfd
->disc
== disc
) {
1214 bfd_find_by_name(const char *name
) OVS_REQUIRES(mutex
)
1218 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1219 if (!strcmp(bfd
->name
, name
)) {
1227 bfd_put_details(struct ds
*ds
, const struct bfd
*bfd
) OVS_REQUIRES(mutex
)
1229 ds_put_format(ds
, "\tForwarding: %s\n",
1230 bfd_forwarding__(CONST_CAST(struct bfd
*, bfd
))
1231 ? "true" : "false");
1232 ds_put_format(ds
, "\tDetect Multiplier: %d\n", bfd
->mult
);
1233 ds_put_format(ds
, "\tConcatenated Path Down: %s\n",
1234 bfd
->cpath_down
? "true" : "false");
1235 ds_put_format(ds
, "\tTX Interval: Approx %lldms\n", bfd_tx_interval(bfd
));
1236 ds_put_format(ds
, "\tRX Interval: Approx %lldms\n", bfd_rx_interval(bfd
));
1237 ds_put_format(ds
, "\tDetect Time: now %+lldms\n",
1238 time_msec() - bfd
->detect_time
);
1239 ds_put_format(ds
, "\tNext TX Time: now %+lldms\n",
1240 time_msec() - bfd
->next_tx
);
1241 ds_put_format(ds
, "\tLast TX Time: now %+lldms\n",
1242 time_msec() - bfd
->last_tx
);
1244 ds_put_cstr(ds
, "\n");
1246 ds_put_format(ds
, "\tLocal Flags: %s\n", bfd_flag_str(bfd
->flags
));
1247 ds_put_format(ds
, "\tLocal Session State: %s\n",
1248 bfd_state_str(bfd
->state
));
1249 ds_put_format(ds
, "\tLocal Diagnostic: %s\n", bfd_diag_str(bfd
->diag
));
1250 ds_put_format(ds
, "\tLocal Discriminator: 0x%"PRIx32
"\n", bfd
->disc
);
1251 ds_put_format(ds
, "\tLocal Minimum TX Interval: %lldms\n",
1253 ds_put_format(ds
, "\tLocal Minimum RX Interval: %lldms\n", bfd
->min_rx
);
1255 ds_put_cstr(ds
, "\n");
1257 ds_put_format(ds
, "\tRemote Flags: %s\n", bfd_flag_str(bfd
->rmt_flags
));
1258 ds_put_format(ds
, "\tRemote Session State: %s\n",
1259 bfd_state_str(bfd
->rmt_state
));
1260 ds_put_format(ds
, "\tRemote Diagnostic: %s\n",
1261 bfd_diag_str(bfd
->rmt_diag
));
1262 ds_put_format(ds
, "\tRemote Discriminator: 0x%"PRIx32
"\n", bfd
->rmt_disc
);
1263 ds_put_format(ds
, "\tRemote Minimum TX Interval: %lldms\n",
1265 ds_put_format(ds
, "\tRemote Minimum RX Interval: %lldms\n",
1270 bfd_unixctl_show(struct unixctl_conn
*conn
, int argc
, const char *argv
[],
1271 void *aux OVS_UNUSED
) OVS_EXCLUDED(mutex
)
1273 struct ds ds
= DS_EMPTY_INITIALIZER
;
1276 ovs_mutex_lock(&mutex
);
1278 bfd
= bfd_find_by_name(argv
[1]);
1280 unixctl_command_reply_error(conn
, "no such bfd object");
1283 bfd_put_details(&ds
, bfd
);
1285 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1286 ds_put_format(&ds
, "---- %s ----\n", bfd
->name
);
1287 bfd_put_details(&ds
, bfd
);
1290 unixctl_command_reply(conn
, ds_cstr(&ds
));
1294 ovs_mutex_unlock(&mutex
);
1299 bfd_unixctl_set_forwarding_override(struct unixctl_conn
*conn
, int argc
,
1300 const char *argv
[], void *aux OVS_UNUSED
)
1303 const char *forward_str
= argv
[argc
- 1];
1304 int forwarding_override
;
1307 ovs_mutex_lock(&mutex
);
1308 if (!strcasecmp("true", forward_str
)) {
1309 forwarding_override
= 1;
1310 } else if (!strcasecmp("false", forward_str
)) {
1311 forwarding_override
= 0;
1312 } else if (!strcasecmp("normal", forward_str
)) {
1313 forwarding_override
= -1;
1315 unixctl_command_reply_error(conn
, "unknown fault string");
1320 bfd
= bfd_find_by_name(argv
[1]);
1322 unixctl_command_reply_error(conn
, "no such BFD object");
1325 bfd
->forwarding_override
= forwarding_override
;
1326 bfd_status_changed(bfd
);
1328 HMAP_FOR_EACH (bfd
, node
, all_bfds
) {
1329 bfd
->forwarding_override
= forwarding_override
;
1330 bfd_status_changed(bfd
);
1334 unixctl_command_reply(conn
, "OK");
1337 ovs_mutex_unlock(&mutex
);