2 * Copyright (c) 2010, 2011, 2012 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
25 #include "byte-order.h"
26 #include "dynamic-string.h"
32 #include "poll-loop.h"
39 VLOG_DEFINE_THIS_MODULE(cfm);
41 #define CFM_MAX_RMPS 256
43 /* Ethernet destination address of CCM packets. */
44 static const uint8_t eth_addr_ccm[6] = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x30 };
45 static const uint8_t eth_addr_ccm_x[6] = {
46 0x01, 0x23, 0x20, 0x00, 0x00, 0x30
49 #define ETH_TYPE_CFM 0x8902
51 /* A 'ccm' represents a Continuity Check Message from the 802.1ag
52 * specification. Continuity Check Messages are broadcast periodically so that
53 * hosts can determine whom they have connectivity to.
55 * The minimum length of a CCM as specified by IEEE 802.1ag is 75 bytes.
56 * Previous versions of Open vSwitch generated 74-byte CCM messages, so we
57 * accept such messages too. */
59 #define CCM_ACCEPT_LEN 74
60 #define CCM_MAID_LEN 48
61 #define CCM_OPCODE 1 /* CFM message opcode meaning CCM. */
62 #define CCM_RDI_MASK 0x80
63 #define CFM_HEALTH_INTERVAL 6
65 uint8_t mdlevel_version; /* MD Level and Version */
71 uint8_t maid[CCM_MAID_LEN];
73 /* Defined by ITU-T Y.1731 should be zero */
74 ovs_be16 interval_ms_x; /* Transmission interval in ms. */
75 ovs_be64 mpid64; /* MPID in extended mode. */
76 uint8_t opdown; /* Operationally down. */
81 } __attribute__((packed));
82 BUILD_ASSERT_DECL(CCM_LEN == sizeof(struct ccm));
85 char *name; /* Name of this CFM object. */
86 struct hmap_node hmap_node; /* Node in all_cfms list. */
89 bool extended; /* Extended mode. */
90 enum cfm_fault_reason fault; /* Connectivity fault status. */
91 enum cfm_fault_reason recv_fault; /* Bit mask of faults occuring on
93 bool opup; /* Operational State. */
94 bool remote_opup; /* Remote Operational State. */
96 int fault_override; /* Manual override of 'fault' status.
97 Ignored if negative. */
99 uint32_t seq; /* The sequence number of our last CCM. */
100 uint8_t ccm_interval; /* The CCM transmission interval. */
101 int ccm_interval_ms; /* 'ccm_interval' in milliseconds. */
102 uint16_t ccm_vlan; /* Vlan tag of CCM PDUs. CFM_RANDOM_VLAN if
104 uint8_t ccm_pcp; /* Priority of CCM PDUs. */
105 uint8_t maid[CCM_MAID_LEN]; /* The MAID of this CFM. */
107 struct timer tx_timer; /* Send CCM when expired. */
108 struct timer fault_timer; /* Check for faults when expired. */
110 struct hmap remote_mps; /* Remote MPs. */
112 /* Result of cfm_get_remote_mpids(). Updated only during fault check to
114 uint64_t *rmps_array; /* Cache of remote_mps. */
115 size_t rmps_array_len; /* Number of rmps in 'rmps_array'. */
117 int health; /* Percentage of the number of CCM frames
119 int health_interval; /* Number of fault_intervals since health was
124 /* Remote MPs represent foreign network entities that are configured to have
125 * the same MAID as this CFM instance. */
127 uint64_t mpid; /* The Maintenance Point ID of this 'remote_mp'. */
128 struct hmap_node node; /* Node in 'remote_mps' map. */
130 bool recv; /* CCM was received since last fault check. */
131 bool opup; /* Operational State. */
132 uint32_t seq; /* Most recently received sequence number. */
133 uint8_t num_health_ccm; /* Number of received ccm frames every
134 CFM_HEALTH_INTERVAL * 'fault_interval'. */
138 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(20, 30);
139 static struct hmap all_cfms = HMAP_INITIALIZER(&all_cfms);
141 static unixctl_cb_func cfm_unixctl_show;
142 static unixctl_cb_func cfm_unixctl_set_fault;
144 static const uint8_t *
145 cfm_ccm_addr(const struct cfm *cfm)
147 return cfm->extended ? eth_addr_ccm_x : eth_addr_ccm;
150 /* Returns the string representation of the given cfm_fault_reason 'reason'. */
152 cfm_fault_reason_to_str(int reason) {
154 #define CFM_FAULT_REASON(NAME, STR) case CFM_FAULT_##NAME: return #STR;
156 #undef CFM_FAULT_REASON
157 default: return "<unknown>";
162 ds_put_cfm_fault(struct ds *ds, int old_fault, int new_fault)
166 for (i = 0; i < CFM_FAULT_N_REASONS; i++) {
169 if ((old_fault | new_fault) & reason) {
170 ds_put_format(ds, " %s%s",
171 (!(old_fault & reason) ? "+"
172 : !(new_fault & reason) ? "-"
174 cfm_fault_reason_to_str(reason));
180 cfm_generate_maid(struct cfm *cfm)
182 const char *ovs_md_name = "ovs";
183 const char *ovs_ma_name = "ovs";
185 size_t md_len, ma_len;
187 memset(cfm->maid, 0, CCM_MAID_LEN);
189 md_len = strlen(ovs_md_name);
190 ma_len = strlen(ovs_ma_name);
192 assert(md_len && ma_len && md_len + ma_len + 4 <= CCM_MAID_LEN);
194 cfm->maid[0] = 4; /* MD name string format. */
195 cfm->maid[1] = md_len; /* MD name size. */
196 memcpy(&cfm->maid[2], ovs_md_name, md_len); /* MD name. */
198 ma_p = cfm->maid + 2 + md_len;
199 ma_p[0] = 2; /* MA name string format. */
200 ma_p[1] = ma_len; /* MA name size. */
201 memcpy(&ma_p[2], ovs_ma_name, ma_len); /* MA name. */
205 ccm_interval_to_ms(uint8_t interval)
208 case 0: NOT_REACHED(); /* Explicitly not supported by 802.1ag. */
209 case 1: return 3; /* Not recommended due to timer resolution. */
210 case 2: return 10; /* Not recommended due to timer resolution. */
213 case 5: return 10000;
214 case 6: return 60000;
215 case 7: return 600000;
216 default: NOT_REACHED(); /* Explicitly not supported by 802.1ag. */
223 cfm_fault_interval(struct cfm *cfm)
225 /* According to the 802.1ag specification we should assume every other MP
226 * with the same MAID has the same transmission interval that we have. If
227 * an MP has a different interval, cfm_process_heartbeat will register it
228 * as a fault (likely due to a configuration error). Thus we can check all
229 * MPs at once making this quite a bit simpler.
231 * According to the specification we should check when (ccm_interval_ms *
232 * 3.5)ms have passed. */
233 return (cfm->ccm_interval_ms * 7) / 2;
237 ms_to_ccm_interval(int interval_ms)
241 for (i = 7; i > 0; i--) {
242 if (ccm_interval_to_ms(i) <= interval_ms) {
251 hash_mpid(uint64_t mpid)
253 return hash_bytes(&mpid, sizeof mpid, 0);
257 cfm_is_valid_mpid(bool extended, uint64_t mpid)
259 /* 802.1ag specification requires MPIDs to be within the range [1, 8191].
260 * In extended mode we relax this requirement. */
261 return mpid >= 1 && (extended || mpid <= 8191);
264 static struct remote_mp *
265 lookup_remote_mp(const struct cfm *cfm, uint64_t mpid)
267 struct remote_mp *rmp;
269 HMAP_FOR_EACH_IN_BUCKET (rmp, node, hash_mpid(mpid), &cfm->remote_mps) {
270 if (rmp->mpid == mpid) {
281 unixctl_command_register("cfm/show", "[interface]", 0, 1, cfm_unixctl_show,
283 unixctl_command_register("cfm/set-fault", "[interface] normal|false|true",
284 1, 2, cfm_unixctl_set_fault, NULL);
287 /* Allocates a 'cfm' object called 'name'. 'cfm' should be initialized by
288 * cfm_configure() before use. */
290 cfm_create(const char *name)
294 cfm = xzalloc(sizeof *cfm);
295 cfm->name = xstrdup(name);
296 hmap_init(&cfm->remote_mps);
297 cfm_generate_maid(cfm);
298 hmap_insert(&all_cfms, &cfm->hmap_node, hash_string(cfm->name, 0));
299 cfm->remote_opup = true;
300 cfm->fault_override = -1;
306 cfm_destroy(struct cfm *cfm)
308 struct remote_mp *rmp, *rmp_next;
314 HMAP_FOR_EACH_SAFE (rmp, rmp_next, node, &cfm->remote_mps) {
315 hmap_remove(&cfm->remote_mps, &rmp->node);
319 hmap_destroy(&cfm->remote_mps);
320 hmap_remove(&all_cfms, &cfm->hmap_node);
321 free(cfm->rmps_array);
326 /* Should be run periodically to update fault statistics messages. */
328 cfm_run(struct cfm *cfm)
330 if (timer_expired(&cfm->fault_timer)) {
331 long long int interval = cfm_fault_interval(cfm);
332 struct remote_mp *rmp, *rmp_next;
333 bool old_cfm_fault = cfm->fault;
335 cfm->fault = cfm->recv_fault;
338 cfm->rmps_array_len = 0;
339 free(cfm->rmps_array);
340 cfm->rmps_array = xmalloc(hmap_count(&cfm->remote_mps) *
341 sizeof *cfm->rmps_array);
343 cfm->remote_opup = true;
344 if (cfm->health_interval == CFM_HEALTH_INTERVAL) {
345 /* Calculate the cfm health of the interface. If the number of
346 * remote_mpids of a cfm interface is > 1, the cfm health is
347 * undefined. If the number of remote_mpids is 1, the cfm health is
348 * the percentage of the ccm frames received in the
349 * (CFM_HEALTH_INTERVAL * 3.5)ms, else it is 0. */
350 if (hmap_count(&cfm->remote_mps) > 1) {
352 } else if (hmap_is_empty(&cfm->remote_mps)) {
357 rmp = CONTAINER_OF(hmap_first(&cfm->remote_mps),
358 struct remote_mp, node);
359 exp_ccm_recvd = (CFM_HEALTH_INTERVAL * 7) / 2;
360 /* Calculate the percentage of healthy ccm frames received.
361 * Since the 'fault_interval' is (3.5 * cfm_interval), and
362 * 1 CCM packet must be received every cfm_interval,
363 * the 'remote_mpid' health reports the percentage of
364 * healthy CCM frames received every
365 * 'CFM_HEALTH_INTERVAL'th 'fault_interval'. */
366 cfm->health = (rmp->num_health_ccm * 100) / exp_ccm_recvd;
367 cfm->health = MIN(cfm->health, 100);
368 rmp->num_health_ccm = 0;
369 assert(cfm->health >= 0 && cfm->health <= 100);
371 cfm->health_interval = 0;
373 cfm->health_interval++;
375 HMAP_FOR_EACH_SAFE (rmp, rmp_next, node, &cfm->remote_mps) {
378 VLOG_DBG("%s: no CCM from RMP %"PRIu64" in the last %lldms",
379 cfm->name, rmp->mpid, interval);
380 hmap_remove(&cfm->remote_mps, &rmp->node);
386 cfm->remote_opup = rmp->opup;
389 cfm->rmps_array[cfm->rmps_array_len++] = rmp->mpid;
393 if (hmap_is_empty(&cfm->remote_mps)) {
394 cfm->fault |= CFM_FAULT_RECV;
397 if (old_cfm_fault != cfm->fault && !VLOG_DROP_INFO(&rl)) {
398 struct ds ds = DS_EMPTY_INITIALIZER;
400 ds_put_cfm_fault(&ds, old_cfm_fault, cfm->fault);
401 VLOG_INFO("%s: CFM fault status changed:%s", cfm->name,
406 timer_set_duration(&cfm->fault_timer, interval);
407 VLOG_DBG("%s: new fault interval", cfm->name);
411 /* Should be run periodically to check if the CFM module has a CCM message it
414 cfm_should_send_ccm(struct cfm *cfm)
416 return timer_expired(&cfm->tx_timer);
419 /* Composes a CCM message into 'packet'. Messages generated with this function
420 * should be sent whenever cfm_should_send_ccm() indicates. */
422 cfm_compose_ccm(struct cfm *cfm, struct ofpbuf *packet,
423 uint8_t eth_src[ETH_ADDR_LEN])
428 timer_set_duration(&cfm->tx_timer, cfm->ccm_interval_ms);
429 eth_compose(packet, cfm_ccm_addr(cfm), eth_src, ETH_TYPE_CFM, sizeof *ccm);
431 ccm_vlan = (cfm->ccm_vlan != CFM_RANDOM_VLAN
434 ccm_vlan = ccm_vlan & VLAN_VID_MASK;
436 if (ccm_vlan || cfm->ccm_pcp) {
437 uint16_t tci = ccm_vlan | (cfm->ccm_pcp << VLAN_PCP_SHIFT);
438 eth_push_vlan(packet, htons(tci));
442 ccm->mdlevel_version = 0;
443 ccm->opcode = CCM_OPCODE;
444 ccm->tlv_offset = 70;
445 ccm->seq = htonl(++cfm->seq);
446 ccm->flags = cfm->ccm_interval;
447 memcpy(ccm->maid, cfm->maid, sizeof ccm->maid);
448 memset(ccm->zero, 0, sizeof ccm->zero);
452 ccm->mpid = htons(hash_mpid(cfm->mpid));
453 ccm->mpid64 = htonll(cfm->mpid);
454 ccm->opdown = !cfm->opup;
456 ccm->mpid = htons(cfm->mpid);
457 ccm->mpid64 = htonll(0);
461 if (cfm->ccm_interval == 0) {
462 assert(cfm->extended);
463 ccm->interval_ms_x = htons(cfm->ccm_interval_ms);
466 if (hmap_is_empty(&cfm->remote_mps)) {
467 ccm->flags |= CCM_RDI_MASK;
472 cfm_wait(struct cfm *cfm)
474 timer_wait(&cfm->tx_timer);
475 timer_wait(&cfm->fault_timer);
478 /* Configures 'cfm' with settings from 's'. */
480 cfm_configure(struct cfm *cfm, const struct cfm_settings *s)
485 if (!cfm_is_valid_mpid(s->extended, s->mpid) || s->interval <= 0) {
490 cfm->extended = s->extended;
492 interval = ms_to_ccm_interval(s->interval);
493 interval_ms = ccm_interval_to_ms(interval);
495 cfm->ccm_vlan = s->ccm_vlan;
496 cfm->ccm_pcp = s->ccm_pcp & (VLAN_PCP_MASK >> VLAN_PCP_SHIFT);
497 if (cfm->extended && interval_ms != s->interval) {
499 interval_ms = MIN(s->interval, UINT16_MAX);
502 if (interval != cfm->ccm_interval || interval_ms != cfm->ccm_interval_ms) {
503 cfm->ccm_interval = interval;
504 cfm->ccm_interval_ms = interval_ms;
506 timer_set_expired(&cfm->tx_timer);
507 timer_set_duration(&cfm->fault_timer, cfm_fault_interval(cfm));
513 /* Returns true if 'cfm' should process packets from 'flow'. */
515 cfm_should_process_flow(const struct cfm *cfm, const struct flow *flow)
517 return (ntohs(flow->dl_type) == ETH_TYPE_CFM
518 && eth_addr_equals(flow->dl_dst, cfm_ccm_addr(cfm)));
521 /* Updates internal statistics relevant to packet 'p'. Should be called on
522 * every packet whose flow returned true when passed to
523 * cfm_should_process_flow. */
525 cfm_process_heartbeat(struct cfm *cfm, const struct ofpbuf *p)
528 struct eth_header *eth;
531 ccm = ofpbuf_at(p, (uint8_t *)p->l3 - (uint8_t *)p->data, CCM_ACCEPT_LEN);
534 VLOG_INFO_RL(&rl, "%s: Received an unparseable 802.1ag CCM heartbeat.",
539 if (ccm->opcode != CCM_OPCODE) {
540 VLOG_INFO_RL(&rl, "%s: Received an unsupported 802.1ag message. "
541 "(opcode %u)", cfm->name, ccm->opcode);
545 /* According to the 802.1ag specification, reception of a CCM with an
546 * incorrect ccm_interval, unexpected MAID, or unexpected MPID should
547 * trigger a fault. We ignore this requirement for several reasons.
549 * Faults can cause a controller or Open vSwitch to make potentially
550 * expensive changes to the network topology. It seems prudent to trigger
551 * them judiciously, especially when CFM is used to check slave status of
552 * bonds. Furthermore, faults can be maliciously triggered by crafting
553 * unexpected CCMs. */
554 if (memcmp(ccm->maid, cfm->maid, sizeof ccm->maid)) {
555 cfm->recv_fault |= CFM_FAULT_MAID;
556 VLOG_WARN_RL(&rl, "%s: Received unexpected remote MAID from MAC "
557 ETH_ADDR_FMT, cfm->name, ETH_ADDR_ARGS(eth->eth_src));
559 uint8_t ccm_interval = ccm->flags & 0x7;
560 bool ccm_rdi = ccm->flags & CCM_RDI_MASK;
561 uint16_t ccm_interval_ms_x = ntohs(ccm->interval_ms_x);
563 struct remote_mp *rmp;
567 enum cfm_fault_reason cfm_fault = 0;
570 ccm_mpid = ntohll(ccm->mpid64);
571 ccm_opdown = ccm->opdown;
573 ccm_mpid = ntohs(ccm->mpid);
576 ccm_seq = ntohl(ccm->seq);
578 if (ccm_interval != cfm->ccm_interval) {
579 cfm_fault |= CFM_FAULT_INTERVAL;
580 VLOG_WARN_RL(&rl, "%s: received a CCM with an unexpected interval"
581 " (%"PRIu8") from RMP %"PRIu64, cfm->name,
582 ccm_interval, ccm_mpid);
585 if (cfm->extended && ccm_interval == 0
586 && ccm_interval_ms_x != cfm->ccm_interval_ms) {
587 cfm_fault |= CFM_FAULT_INTERVAL;
588 VLOG_WARN_RL(&rl, "%s: received a CCM with an unexpected extended"
589 " interval (%"PRIu16"ms) from RMP %"PRIu64, cfm->name,
590 ccm_interval_ms_x, ccm_mpid);
593 rmp = lookup_remote_mp(cfm, ccm_mpid);
595 if (hmap_count(&cfm->remote_mps) < CFM_MAX_RMPS) {
596 rmp = xzalloc(sizeof *rmp);
597 hmap_insert(&cfm->remote_mps, &rmp->node, hash_mpid(ccm_mpid));
599 cfm_fault |= CFM_FAULT_OVERFLOW;
601 "%s: dropped CCM with MPID %"PRIu64" from MAC "
602 ETH_ADDR_FMT, cfm->name, ccm_mpid,
603 ETH_ADDR_ARGS(eth->eth_src));
608 cfm_fault |= CFM_FAULT_RDI;
609 VLOG_DBG("%s: RDI bit flagged from RMP %"PRIu64, cfm->name,
613 VLOG_DBG("%s: received CCM (seq %"PRIu32") (mpid %"PRIu64")"
614 " (interval %"PRIu8") (RDI %s)", cfm->name, ccm_seq,
615 ccm_mpid, ccm_interval, ccm_rdi ? "true" : "false");
618 if (rmp->mpid == cfm->mpid) {
619 cfm_fault |= CFM_FAULT_LOOPBACK;
620 VLOG_WARN_RL(&rl,"%s: received CCM with local MPID"
621 " %"PRIu64, cfm->name, rmp->mpid);
624 if (rmp->seq && ccm_seq != (rmp->seq + 1)) {
625 cfm_fault |= CFM_FAULT_SEQUENCE;
626 VLOG_WARN_RL(&rl, "%s: (mpid %"PRIu64") detected sequence"
627 " numbers which indicate possible connectivity"
628 " problems (previous %"PRIu32") (current %"PRIu32
629 ")", cfm->name, ccm_mpid, rmp->seq, ccm_seq);
632 rmp->mpid = ccm_mpid;
634 rmp->num_health_ccm++;
637 cfm->recv_fault |= cfm_fault;
639 rmp->opup = !ccm_opdown;
644 /* Gets the fault status of 'cfm'. Returns a bit mask of 'cfm_fault_reason's
645 * indicating the cause of the connectivity fault, or zero if there is no
648 cfm_get_fault(const struct cfm *cfm)
650 if (cfm->fault_override >= 0) {
651 return cfm->fault_override ? CFM_FAULT_OVERRIDE : 0;
656 /* Gets the health of 'cfm'. Returns an integer between 0 and 100 indicating
657 * the health of the link as a percentage of ccm frames received in
658 * CFM_HEALTH_INTERVAL * 'fault_interval' if there is only 1 remote_mpid,
659 * returns 0 if there are no remote_mpids, and returns -1 if there are more
660 * than 1 remote_mpids. */
662 cfm_get_health(const struct cfm *cfm)
667 /* Gets the operational state of 'cfm'. 'cfm' is considered operationally down
668 * if it has received a CCM with the operationally down bit set from any of its
669 * remote maintenance points. Returns true if 'cfm' is operationally up. False
672 cfm_get_opup(const struct cfm *cfm)
674 return cfm->remote_opup;
677 /* Populates 'rmps' with an array of remote maintenance points reachable by
678 * 'cfm'. The number of remote maintenance points is written to 'n_rmps'.
679 * 'cfm' retains ownership of the array written to 'rmps' */
681 cfm_get_remote_mpids(const struct cfm *cfm, const uint64_t **rmps,
684 *rmps = cfm->rmps_array;
685 *n_rmps = cfm->rmps_array_len;
689 cfm_find(const char *name)
693 HMAP_FOR_EACH_WITH_HASH (cfm, hmap_node, hash_string(name, 0), &all_cfms) {
694 if (!strcmp(cfm->name, name)) {
702 cfm_print_details(struct ds *ds, const struct cfm *cfm)
704 struct remote_mp *rmp;
707 ds_put_format(ds, "---- %s ----\n", cfm->name);
708 ds_put_format(ds, "MPID %"PRIu64":%s%s\n", cfm->mpid,
709 cfm->extended ? " extended" : "",
710 cfm->fault_override >= 0 ? " fault_override" : "");
712 fault = cfm_get_fault(cfm);
714 ds_put_cstr(ds, "\tfault:");
715 ds_put_cfm_fault(ds, fault, fault);
716 ds_put_cstr(ds, "\n");
719 if (cfm->health == -1) {
720 ds_put_format(ds, "\taverage health: undefined\n");
722 ds_put_format(ds, "\taverage health: %d\n", cfm->health);
724 ds_put_format(ds, "\topstate: %s\n", cfm->opup ? "up" : "down");
725 ds_put_format(ds, "\tremote_opstate: %s\n",
726 cfm->remote_opup ? "up" : "down");
727 ds_put_format(ds, "\tinterval: %dms\n", cfm->ccm_interval_ms);
728 ds_put_format(ds, "\tnext CCM tx: %lldms\n",
729 timer_msecs_until_expired(&cfm->tx_timer));
730 ds_put_format(ds, "\tnext fault check: %lldms\n",
731 timer_msecs_until_expired(&cfm->fault_timer));
733 HMAP_FOR_EACH (rmp, node, &cfm->remote_mps) {
734 ds_put_format(ds, "Remote MPID %"PRIu64"\n", rmp->mpid);
735 ds_put_format(ds, "\trecv since check: %s\n",
736 rmp->recv ? "true" : "false");
737 ds_put_format(ds, "\topstate: %s\n", rmp->opup? "up" : "down");
742 cfm_unixctl_show(struct unixctl_conn *conn, int argc, const char *argv[],
743 void *aux OVS_UNUSED)
745 struct ds ds = DS_EMPTY_INITIALIZER;
746 const struct cfm *cfm;
749 cfm = cfm_find(argv[1]);
751 unixctl_command_reply_error(conn, "no such CFM object");
754 cfm_print_details(&ds, cfm);
756 HMAP_FOR_EACH (cfm, hmap_node, &all_cfms) {
757 cfm_print_details(&ds, cfm);
761 unixctl_command_reply(conn, ds_cstr(&ds));
766 cfm_unixctl_set_fault(struct unixctl_conn *conn, int argc, const char *argv[],
767 void *aux OVS_UNUSED)
769 const char *fault_str = argv[argc - 1];
773 if (!strcasecmp("true", fault_str)) {
775 } else if (!strcasecmp("false", fault_str)) {
777 } else if (!strcasecmp("normal", fault_str)) {
780 unixctl_command_reply_error(conn, "unknown fault string");
785 cfm = cfm_find(argv[1]);
787 unixctl_command_reply_error(conn, "no such CFM object");
790 cfm->fault_override = fault_override;
792 HMAP_FOR_EACH (cfm, hmap_node, &all_cfms) {
793 cfm->fault_override = fault_override;
797 unixctl_command_reply(conn, "OK");