1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 #include <linux/cfm_bridge.h>
4 #include <uapi/linux/cfm_bridge.h>
5 #include "br_private_cfm.h"
6
7 static struct br_cfm_mep *br_mep_find(struct net_bridge *br, u32 instance)
8 {
9 struct br_cfm_mep *mep;
10
11 hlist_for_each_entry(mep, &br->mep_list, head)
12 if (mep->instance == instance)
13 return mep;
14
15 return NULL;
16 }
17
18 static struct br_cfm_mep *br_mep_find_ifindex(struct net_bridge *br,
19 u32 ifindex)
20 {
21 struct br_cfm_mep *mep;
22
23 hlist_for_each_entry_rcu(mep, &br->mep_list, head,
24 lockdep_rtnl_is_held())
25 if (mep->create.ifindex == ifindex)
26 return mep;
27
28 return NULL;
29 }
30
31 static struct br_cfm_peer_mep *br_peer_mep_find(struct br_cfm_mep *mep,
32 u32 mepid)
33 {
34 struct br_cfm_peer_mep *peer_mep;
35
36 hlist_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head,
37 lockdep_rtnl_is_held())
38 if (peer_mep->mepid == mepid)
39 return peer_mep;
40
41 return NULL;
42 }
43
44 static struct net_bridge_port *br_mep_get_port(struct net_bridge *br,
45 u32 ifindex)
46 {
47 struct net_bridge_port *port;
48
49 list_for_each_entry(port, &br->port_list, list)
50 if (port->dev->ifindex == ifindex)
51 return port;
52
53 return NULL;
54 }
55
56 /* Calculate the CCM interval in us. */
57 static u32 interval_to_us(enum br_cfm_ccm_interval interval)
58 {
59 switch (interval) {
60 case BR_CFM_CCM_INTERVAL_NONE:
61 return 0;
62 case BR_CFM_CCM_INTERVAL_3_3_MS:
63 return 3300;
64 case BR_CFM_CCM_INTERVAL_10_MS:
65 return 10 * 1000;
66 case BR_CFM_CCM_INTERVAL_100_MS:
67 return 100 * 1000;
68 case BR_CFM_CCM_INTERVAL_1_SEC:
69 return 1000 * 1000;
70 case BR_CFM_CCM_INTERVAL_10_SEC:
71 return 10 * 1000 * 1000;
72 case BR_CFM_CCM_INTERVAL_1_MIN:
73 return 60 * 1000 * 1000;
74 case BR_CFM_CCM_INTERVAL_10_MIN:
75 return 10 * 60 * 1000 * 1000;
76 }
77 return 0;
78 }
79
80 /* Convert the interface interval to CCM PDU value. */
81 static u32 interval_to_pdu(enum br_cfm_ccm_interval interval)
82 {
83 switch (interval) {
84 case BR_CFM_CCM_INTERVAL_NONE:
85 return 0;
86 case BR_CFM_CCM_INTERVAL_3_3_MS:
87 return 1;
88 case BR_CFM_CCM_INTERVAL_10_MS:
89 return 2;
90 case BR_CFM_CCM_INTERVAL_100_MS:
91 return 3;
92 case BR_CFM_CCM_INTERVAL_1_SEC:
93 return 4;
94 case BR_CFM_CCM_INTERVAL_10_SEC:
95 return 5;
96 case BR_CFM_CCM_INTERVAL_1_MIN:
97 return 6;
98 case BR_CFM_CCM_INTERVAL_10_MIN:
99 return 7;
100 }
101 return 0;
102 }
103
104 /* Convert the CCM PDU value to interval on interface. */
105 static u32 pdu_to_interval(u32 value)
106 {
107 switch (value) {
108 case 0:
109 return BR_CFM_CCM_INTERVAL_NONE;
110 case 1:
111 return BR_CFM_CCM_INTERVAL_3_3_MS;
112 case 2:
113 return BR_CFM_CCM_INTERVAL_10_MS;
114 case 3:
115 return BR_CFM_CCM_INTERVAL_100_MS;
116 case 4:
117 return BR_CFM_CCM_INTERVAL_1_SEC;
118 case 5:
119 return BR_CFM_CCM_INTERVAL_10_SEC;
120 case 6:
121 return BR_CFM_CCM_INTERVAL_1_MIN;
122 case 7:
123 return BR_CFM_CCM_INTERVAL_10_MIN;
124 }
125 return BR_CFM_CCM_INTERVAL_NONE;
126 }
127
128 static void ccm_rx_timer_start(struct br_cfm_peer_mep *peer_mep)
129 {
130 u32 interval_us;
131
132 interval_us = interval_to_us(peer_mep->mep->cc_config.exp_interval);
133 /* Function ccm_rx_dwork must be called with 1/4
134 * of the configured CC 'expected_interval'
135 * in order to detect CCM defect after 3.25 interval.
136 */
137 queue_delayed_work(system_wq, &peer_mep->ccm_rx_dwork,
138 usecs_to_jiffies(interval_us / 4));
139 }
140
141 static void br_cfm_notify(int event, const struct net_bridge_port *port)
142 {
143 u32 filter = RTEXT_FILTER_CFM_STATUS;
144
145 br_info_notify(event, port->br, NULL, filter);
146 }
147
148 static void cc_peer_enable(struct br_cfm_peer_mep *peer_mep)
149 {
150 memset(&peer_mep->cc_status, 0, sizeof(peer_mep->cc_status));
151 peer_mep->ccm_rx_count_miss = 0;
152
153 ccm_rx_timer_start(peer_mep);
154 }
155
156 static void cc_peer_disable(struct br_cfm_peer_mep *peer_mep)
157 {
158 cancel_delayed_work_sync(&peer_mep->ccm_rx_dwork);
159 }
160
161 static struct sk_buff *ccm_frame_build(struct br_cfm_mep *mep,
162 const struct br_cfm_cc_ccm_tx_info *const tx_info)
163
164 {
165 struct br_cfm_common_hdr *common_hdr;
166 struct net_bridge_port *b_port;
167 struct br_cfm_maid *maid;
168 u8 *itu_reserved, *e_tlv;
169 struct ethhdr *eth_hdr;
170 struct sk_buff *skb;
171 __be32 *status_tlv;
172 __be32 *snumber;
173 __be16 *mepid;
174
175 skb = dev_alloc_skb(CFM_CCM_MAX_FRAME_LENGTH);
176 if (!skb)
177 return NULL;
178
179 rcu_read_lock();
180 b_port = rcu_dereference(mep->b_port);
181 if (!b_port) {
182 kfree_skb(skb);
183 rcu_read_unlock();
184 return NULL;
185 }
186 skb->dev = b_port->dev;
187 rcu_read_unlock();
188 /* The device cannot be deleted until the work_queue functions has
189 * completed. This function is called from ccm_tx_work_expired()
190 * that is a work_queue functions.
191 */
192
193 skb->protocol = htons(ETH_P_CFM);
194 skb->priority = CFM_FRAME_PRIO;
195
196 /* Ethernet header */
197 eth_hdr = skb_put(skb, sizeof(*eth_hdr));
198 ether_addr_copy(eth_hdr->h_dest, tx_info->dmac.addr);
199 ether_addr_copy(eth_hdr->h_source, mep->config.unicast_mac.addr);
200 eth_hdr->h_proto = htons(ETH_P_CFM);
201
202 /* Common CFM Header */
203 common_hdr = skb_put(skb, sizeof(*common_hdr));
204 common_hdr->mdlevel_version = mep->config.mdlevel << 5;
205 common_hdr->opcode = BR_CFM_OPCODE_CCM;
206 common_hdr->flags = (mep->rdi << 7) |
207 interval_to_pdu(mep->cc_config.exp_interval);
208 common_hdr->tlv_offset = CFM_CCM_TLV_OFFSET;
209
210 /* Sequence number */
211 snumber = skb_put(skb, sizeof(*snumber));
212 if (tx_info->seq_no_update) {
213 *snumber = cpu_to_be32(mep->ccm_tx_snumber);
214 mep->ccm_tx_snumber += 1;
215 } else {
216 *snumber = 0;
217 }
218
219 mepid = skb_put(skb, sizeof(*mepid));
220 *mepid = cpu_to_be16((u16)mep->config.mepid);
221
222 maid = skb_put(skb, sizeof(*maid));
223 memcpy(maid->data, mep->cc_config.exp_maid.data, sizeof(maid->data));
224
225 /* ITU reserved (CFM_CCM_ITU_RESERVED_SIZE octets) */
226 itu_reserved = skb_put(skb, CFM_CCM_ITU_RESERVED_SIZE);
227 memset(itu_reserved, 0, CFM_CCM_ITU_RESERVED_SIZE);
228
229 /* Generel CFM TLV format:
230 * TLV type: one byte
231 * TLV value length: two bytes
232 * TLV value: 'TLV value length' bytes
233 */
234
235 /* Port status TLV. The value length is 1. Total of 4 bytes. */
236 if (tx_info->port_tlv) {
237 status_tlv = skb_put(skb, sizeof(*status_tlv));
238 *status_tlv = cpu_to_be32((CFM_PORT_STATUS_TLV_TYPE << 24) |
239 (1 << 8) | /* Value length */
240 (tx_info->port_tlv_value & 0xFF));
241 }
242
243 /* Interface status TLV. The value length is 1. Total of 4 bytes. */
244 if (tx_info->if_tlv) {
245 status_tlv = skb_put(skb, sizeof(*status_tlv));
246 *status_tlv = cpu_to_be32((CFM_IF_STATUS_TLV_TYPE << 24) |
247 (1 << 8) | /* Value length */
248 (tx_info->if_tlv_value & 0xFF));
249 }
250
251 /* End TLV */
252 e_tlv = skb_put(skb, sizeof(*e_tlv));
253 *e_tlv = CFM_ENDE_TLV_TYPE;
254
255 return skb;
256 }
257
258 static void ccm_frame_tx(struct sk_buff *skb)
259 {
260 skb_reset_network_header(skb);
261 dev_queue_xmit(skb);
262 }
263
264 /* This function is called with the configured CC 'expected_interval'
265 * in order to drive CCM transmission when enabled.
266 */
267 static void ccm_tx_work_expired(struct work_struct *work)
268 {
269 struct delayed_work *del_work;
270 struct br_cfm_mep *mep;
271 struct sk_buff *skb;
272 u32 interval_us;
273
274 del_work = to_delayed_work(work);
275 mep = container_of(del_work, struct br_cfm_mep, ccm_tx_dwork);
276
277 if (time_before_eq(mep->ccm_tx_end, jiffies)) {
278 /* Transmission period has ended */
279 mep->cc_ccm_tx_info.period = 0;
280 return;
281 }
282
283 skb = ccm_frame_build(mep, &mep->cc_ccm_tx_info);
284 if (skb)
285 ccm_frame_tx(skb);
286
287 interval_us = interval_to_us(mep->cc_config.exp_interval);
288 queue_delayed_work(system_wq, &mep->ccm_tx_dwork,
289 usecs_to_jiffies(interval_us));
290 }
291
292 /* This function is called with 1/4 of the configured CC 'expected_interval'
293 * in order to detect CCM defect after 3.25 interval.
294 */
295 static void ccm_rx_work_expired(struct work_struct *work)
296 {
297 struct br_cfm_peer_mep *peer_mep;
298 struct net_bridge_port *b_port;
299 struct delayed_work *del_work;
300
301 del_work = to_delayed_work(work);
302 peer_mep = container_of(del_work, struct br_cfm_peer_mep, ccm_rx_dwork);
303
304 /* After 13 counts (4 * 3,25) then 3.25 intervals are expired */
305 if (peer_mep->ccm_rx_count_miss < 13) {
306 /* 3.25 intervals are NOT expired without CCM reception */
307 peer_mep->ccm_rx_count_miss++;
308
309 /* Start timer again */
310 ccm_rx_timer_start(peer_mep);
311 } else {
312 /* 3.25 intervals are expired without CCM reception.
313 * CCM defect detected
314 */
315 peer_mep->cc_status.ccm_defect = true;
316
317 /* Change in CCM defect status - notify */
318 rcu_read_lock();
319 b_port = rcu_dereference(peer_mep->mep->b_port);
320 if (b_port)
321 br_cfm_notify(RTM_NEWLINK, b_port);
322 rcu_read_unlock();
323 }
324 }
325
326 static u32 ccm_tlv_extract(struct sk_buff *skb, u32 index,
327 struct br_cfm_peer_mep *peer_mep)
328 {
329 __be32 *s_tlv;
330 __be32 _s_tlv;
331 u32 h_s_tlv;
332 u8 *e_tlv;
333 u8 _e_tlv;
334
335 e_tlv = skb_header_pointer(skb, index, sizeof(_e_tlv), &_e_tlv);
336 if (!e_tlv)
337 return 0;
338
339 /* TLV is present - get the status TLV */
340 s_tlv = skb_header_pointer(skb,
341 index,
342 sizeof(_s_tlv), &_s_tlv);
343 if (!s_tlv)
344 return 0;
345
346 h_s_tlv = ntohl(*s_tlv);
347 if ((h_s_tlv >> 24) == CFM_IF_STATUS_TLV_TYPE) {
348 /* Interface status TLV */
349 peer_mep->cc_status.tlv_seen = true;
350 peer_mep->cc_status.if_tlv_value = (h_s_tlv & 0xFF);
351 }
352
353 if ((h_s_tlv >> 24) == CFM_PORT_STATUS_TLV_TYPE) {
354 /* Port status TLV */
355 peer_mep->cc_status.tlv_seen = true;
356 peer_mep->cc_status.port_tlv_value = (h_s_tlv & 0xFF);
357 }
358
359 /* The Sender ID TLV is not handled */
360 /* The Organization-Specific TLV is not handled */
361
362 /* Return the length of this tlv.
363 * This is the length of the value field plus 3 bytes for size of type
364 * field and length field
365 */
366 return ((h_s_tlv >> 8) & 0xFFFF) + 3;
367 }
368
369 /* note: already called with rcu_read_lock */
370 static int br_cfm_frame_rx(struct net_bridge_port *port, struct sk_buff *skb)
371 {
372 u32 mdlevel, interval, size, index, max;
373 const struct br_cfm_common_hdr *hdr;
374 struct br_cfm_peer_mep *peer_mep;
375 const struct br_cfm_maid *maid;
376 struct br_cfm_common_hdr _hdr;
377 struct br_cfm_maid _maid;
378 struct br_cfm_mep *mep;
379 struct net_bridge *br;
380 __be32 *snumber;
381 __be32 _snumber;
382 __be16 *mepid;
383 __be16 _mepid;
384
385 if (port->state == BR_STATE_DISABLED)
386 return 0;
387
388 hdr = skb_header_pointer(skb, 0, sizeof(_hdr), &_hdr);
389 if (!hdr)
390 return 1;
391
392 br = port->br;
393 mep = br_mep_find_ifindex(br, port->dev->ifindex);
394 if (unlikely(!mep))
395 /* No MEP on this port - must be forwarded */
396 return 0;
397
398 mdlevel = hdr->mdlevel_version >> 5;
399 if (mdlevel > mep->config.mdlevel)
400 /* The level is above this MEP level - must be forwarded */
401 return 0;
402
403 if ((hdr->mdlevel_version & 0x1F) != 0) {
404 /* Invalid version */
405 mep->status.version_unexp_seen = true;
406 return 1;
407 }
408
409 if (mdlevel < mep->config.mdlevel) {
410 /* The level is below this MEP level */
411 mep->status.rx_level_low_seen = true;
412 return 1;
413 }
414
415 if (hdr->opcode == BR_CFM_OPCODE_CCM) {
416 /* CCM PDU received. */
417 /* MA ID is after common header + sequence number + MEP ID */
418 maid = skb_header_pointer(skb,
419 CFM_CCM_PDU_MAID_OFFSET,
420 sizeof(_maid), &_maid);
421 if (!maid)
422 return 1;
423 if (memcmp(maid->data, mep->cc_config.exp_maid.data,
424 sizeof(maid->data)))
425 /* MA ID not as expected */
426 return 1;
427
428 /* MEP ID is after common header + sequence number */
429 mepid = skb_header_pointer(skb,
430 CFM_CCM_PDU_MEPID_OFFSET,
431 sizeof(_mepid), &_mepid);
432 if (!mepid)
433 return 1;
434 peer_mep = br_peer_mep_find(mep, (u32)ntohs(*mepid));
435 if (!peer_mep)
436 return 1;
437
438 /* Interval is in common header flags */
439 interval = hdr->flags & 0x07;
440 if (mep->cc_config.exp_interval != pdu_to_interval(interval))
441 /* Interval not as expected */
442 return 1;
443
444 /* A valid CCM frame is received */
445 if (peer_mep->cc_status.ccm_defect) {
446 peer_mep->cc_status.ccm_defect = false;
447
448 /* Change in CCM defect status - notify */
449 br_cfm_notify(RTM_NEWLINK, port);
450
451 /* Start CCM RX timer */
452 ccm_rx_timer_start(peer_mep);
453 }
454
455 peer_mep->cc_status.seen = true;
456 peer_mep->ccm_rx_count_miss = 0;
457
458 /* RDI is in common header flags */
459 peer_mep->cc_status.rdi = (hdr->flags & 0x80) ? true : false;
460
461 /* Sequence number is after common header */
462 snumber = skb_header_pointer(skb,
463 CFM_CCM_PDU_SEQNR_OFFSET,
464 sizeof(_snumber), &_snumber);
465 if (!snumber)
466 return 1;
467 if (ntohl(*snumber) != (mep->ccm_rx_snumber + 1))
468 /* Unexpected sequence number */
469 peer_mep->cc_status.seq_unexp_seen = true;
470
471 mep->ccm_rx_snumber = ntohl(*snumber);
472
473 /* TLV end is after common header + sequence number + MEP ID +
474 * MA ID + ITU reserved
475 */
476 index = CFM_CCM_PDU_TLV_OFFSET;
477 max = 0;
478 do { /* Handle all TLVs */
479 size = ccm_tlv_extract(skb, index, peer_mep);
480 index += size;
481 max += 1;
482 } while (size != 0 && max < 4); /* Max four TLVs possible */
483
484 return 1;
485 }
486
487 mep->status.opcode_unexp_seen = true;
488
489 return 1;
490 }
491
492 static struct br_frame_type cfm_frame_type __read_mostly = {
493 .type = cpu_to_be16(ETH_P_CFM),
494 .frame_handler = br_cfm_frame_rx,
495 };
496
497 int br_cfm_mep_create(struct net_bridge *br,
498 const u32 instance,
499 struct br_cfm_mep_create *const create,
500 struct netlink_ext_ack *extack)
501 {
502 struct net_bridge_port *p;
503 struct br_cfm_mep *mep;
504
505 ASSERT_RTNL();
506
507 if (create->domain == BR_CFM_VLAN) {
508 NL_SET_ERR_MSG_MOD(extack,
509 "VLAN domain not supported");
510 return -EINVAL;
511 }
512 if (create->domain != BR_CFM_PORT) {
513 NL_SET_ERR_MSG_MOD(extack,
514 "Invalid domain value");
515 return -EINVAL;
516 }
517 if (create->direction == BR_CFM_MEP_DIRECTION_UP) {
518 NL_SET_ERR_MSG_MOD(extack,
519 "Up-MEP not supported");
520 return -EINVAL;
521 }
522 if (create->direction != BR_CFM_MEP_DIRECTION_DOWN) {
523 NL_SET_ERR_MSG_MOD(extack,
524 "Invalid direction value");
525 return -EINVAL;
526 }
527 p = br_mep_get_port(br, create->ifindex);
528 if (!p) {
529 NL_SET_ERR_MSG_MOD(extack,
530 "Port is not related to bridge");
531 return -EINVAL;
532 }
533 mep = br_mep_find(br, instance);
534 if (mep) {
535 NL_SET_ERR_MSG_MOD(extack,
536 "MEP instance already exists");
537 return -EEXIST;
538 }
539
540 /* In PORT domain only one instance can be created per port */
541 if (create->domain == BR_CFM_PORT) {
542 mep = br_mep_find_ifindex(br, create->ifindex);
543 if (mep) {
544 NL_SET_ERR_MSG_MOD(extack,
545 "Only one Port MEP on a port allowed");
546 return -EINVAL;
547 }
548 }
549
550 mep = kzalloc(sizeof(*mep), GFP_KERNEL);
551 if (!mep)
552 return -ENOMEM;
553
554 mep->create = *create;
555 mep->instance = instance;
556 rcu_assign_pointer(mep->b_port, p);
557
558 INIT_HLIST_HEAD(&mep->peer_mep_list);
559 INIT_DELAYED_WORK(&mep->ccm_tx_dwork, ccm_tx_work_expired);
560
561 if (hlist_empty(&br->mep_list))
562 br_add_frame(br, &cfm_frame_type);
563
564 hlist_add_tail_rcu(&mep->head, &br->mep_list);
565
566 return 0;
567 }
568
569 static void mep_delete_implementation(struct net_bridge *br,
570 struct br_cfm_mep *mep)
571 {
572 struct br_cfm_peer_mep *peer_mep;
573 struct hlist_node *n_store;
574
575 ASSERT_RTNL();
576
577 /* Empty and free peer MEP list */
578 hlist_for_each_entry_safe(peer_mep, n_store, &mep->peer_mep_list, head) {
579 cancel_delayed_work_sync(&peer_mep->ccm_rx_dwork);
580 hlist_del_rcu(&peer_mep->head);
581 kfree_rcu(peer_mep, rcu);
582 }
583
584 cancel_delayed_work_sync(&mep->ccm_tx_dwork);
585
586 RCU_INIT_POINTER(mep->b_port, NULL);
587 hlist_del_rcu(&mep->head);
588 kfree_rcu(mep, rcu);
589
590 if (hlist_empty(&br->mep_list))
591 br_del_frame(br, &cfm_frame_type);
592 }
593
594 int br_cfm_mep_delete(struct net_bridge *br,
595 const u32 instance,
596 struct netlink_ext_ack *extack)
597 {
598 struct br_cfm_mep *mep;
599
600 ASSERT_RTNL();
601
602 mep = br_mep_find(br, instance);
603 if (!mep) {
604 NL_SET_ERR_MSG_MOD(extack,
605 "MEP instance does not exists");
606 return -ENOENT;
607 }
608
609 mep_delete_implementation(br, mep);
610
611 return 0;
612 }
613
614 int br_cfm_mep_config_set(struct net_bridge *br,
615 const u32 instance,
616 const struct br_cfm_mep_config *const config,
617 struct netlink_ext_ack *extack)
618 {
619 struct br_cfm_mep *mep;
620
621 ASSERT_RTNL();
622
623 mep = br_mep_find(br, instance);
624 if (!mep) {
625 NL_SET_ERR_MSG_MOD(extack,
626 "MEP instance does not exists");
627 return -ENOENT;
628 }
629
630 mep->config = *config;
631
632 return 0;
633 }
634
635 int br_cfm_cc_config_set(struct net_bridge *br,
636 const u32 instance,
637 const struct br_cfm_cc_config *const config,
638 struct netlink_ext_ack *extack)
639 {
640 struct br_cfm_peer_mep *peer_mep;
641 struct br_cfm_mep *mep;
642
643 ASSERT_RTNL();
644
645 mep = br_mep_find(br, instance);
646 if (!mep) {
647 NL_SET_ERR_MSG_MOD(extack,
648 "MEP instance does not exists");
649 return -ENOENT;
650 }
651
652 /* Check for no change in configuration */
653 if (memcmp(config, &mep->cc_config, sizeof(*config)) == 0)
654 return 0;
655
656 if (config->enable && !mep->cc_config.enable)
657 /* CC is enabled */
658 hlist_for_each_entry(peer_mep, &mep->peer_mep_list, head)
659 cc_peer_enable(peer_mep);
660
661 if (!config->enable && mep->cc_config.enable)
662 /* CC is disabled */
663 hlist_for_each_entry(peer_mep, &mep->peer_mep_list, head)
664 cc_peer_disable(peer_mep);
665
666 mep->cc_config = *config;
667 mep->ccm_rx_snumber = 0;
668 mep->ccm_tx_snumber = 1;
669
670 return 0;
671 }
672
673 int br_cfm_cc_peer_mep_add(struct net_bridge *br, const u32 instance,
674 u32 mepid,
675 struct netlink_ext_ack *extack)
676 {
677 struct br_cfm_peer_mep *peer_mep;
678 struct br_cfm_mep *mep;
679
680 ASSERT_RTNL();
681
682 mep = br_mep_find(br, instance);
683 if (!mep) {
684 NL_SET_ERR_MSG_MOD(extack,
685 "MEP instance does not exists");
686 return -ENOENT;
687 }
688
689 peer_mep = br_peer_mep_find(mep, mepid);
690 if (peer_mep) {
691 NL_SET_ERR_MSG_MOD(extack,
692 "Peer MEP-ID already exists");
693 return -EEXIST;
694 }
695
696 peer_mep = kzalloc(sizeof(*peer_mep), GFP_KERNEL);
697 if (!peer_mep)
698 return -ENOMEM;
699
700 peer_mep->mepid = mepid;
701 peer_mep->mep = mep;
702 INIT_DELAYED_WORK(&peer_mep->ccm_rx_dwork, ccm_rx_work_expired);
703
704 if (mep->cc_config.enable)
705 cc_peer_enable(peer_mep);
706
707 hlist_add_tail_rcu(&peer_mep->head, &mep->peer_mep_list);
708
709 return 0;
710 }
711
712 int br_cfm_cc_peer_mep_remove(struct net_bridge *br, const u32 instance,
713 u32 mepid,
714 struct netlink_ext_ack *extack)
715 {
716 struct br_cfm_peer_mep *peer_mep;
717 struct br_cfm_mep *mep;
718
719 ASSERT_RTNL();
720
721 mep = br_mep_find(br, instance);
722 if (!mep) {
723 NL_SET_ERR_MSG_MOD(extack,
724 "MEP instance does not exists");
725 return -ENOENT;
726 }
727
728 peer_mep = br_peer_mep_find(mep, mepid);
729 if (!peer_mep) {
730 NL_SET_ERR_MSG_MOD(extack,
731 "Peer MEP-ID does not exists");
732 return -ENOENT;
733 }
734
735 cc_peer_disable(peer_mep);
736
737 hlist_del_rcu(&peer_mep->head);
738 kfree_rcu(peer_mep, rcu);
739
740 return 0;
741 }
742
743 int br_cfm_cc_rdi_set(struct net_bridge *br, const u32 instance,
744 const bool rdi, struct netlink_ext_ack *extack)
745 {
746 struct br_cfm_mep *mep;
747
748 ASSERT_RTNL();
749
750 mep = br_mep_find(br, instance);
751 if (!mep) {
752 NL_SET_ERR_MSG_MOD(extack,
753 "MEP instance does not exists");
754 return -ENOENT;
755 }
756
757 mep->rdi = rdi;
758
759 return 0;
760 }
761
762 int br_cfm_cc_ccm_tx(struct net_bridge *br, const u32 instance,
763 const struct br_cfm_cc_ccm_tx_info *const tx_info,
764 struct netlink_ext_ack *extack)
765 {
766 struct br_cfm_mep *mep;
767
768 ASSERT_RTNL();
769
770 mep = br_mep_find(br, instance);
771 if (!mep) {
772 NL_SET_ERR_MSG_MOD(extack,
773 "MEP instance does not exists");
774 return -ENOENT;
775 }
776
777 if (memcmp(tx_info, &mep->cc_ccm_tx_info, sizeof(*tx_info)) == 0) {
778 /* No change in tx_info. */
779 if (mep->cc_ccm_tx_info.period == 0)
780 /* Transmission is not enabled - just return */
781 return 0;
782
783 /* Transmission is ongoing, the end time is recalculated */
784 mep->ccm_tx_end = jiffies +
785 usecs_to_jiffies(tx_info->period * 1000000);
786 return 0;
787 }
788
789 if (tx_info->period == 0 && mep->cc_ccm_tx_info.period == 0)
790 /* Some change in info and transmission is not ongoing */
791 goto save;
792
793 if (tx_info->period != 0 && mep->cc_ccm_tx_info.period != 0) {
794 /* Some change in info and transmission is ongoing
795 * The end time is recalculated
796 */
797 mep->ccm_tx_end = jiffies +
798 usecs_to_jiffies(tx_info->period * 1000000);
799
800 goto save;
801 }
802
803 if (tx_info->period == 0 && mep->cc_ccm_tx_info.period != 0) {
804 cancel_delayed_work_sync(&mep->ccm_tx_dwork);
805 goto save;
806 }
807
808 /* Start delayed work to transmit CCM frames. It is done with zero delay
809 * to send first frame immediately
810 */
811 mep->ccm_tx_end = jiffies + usecs_to_jiffies(tx_info->period * 1000000);
812 queue_delayed_work(system_wq, &mep->ccm_tx_dwork, 0);
813
814 save:
815 mep->cc_ccm_tx_info = *tx_info;
816
817 return 0;
818 }
819
820 int br_cfm_mep_count(struct net_bridge *br, u32 *count)
821 {
822 struct br_cfm_mep *mep;
823
824 *count = 0;
825
826 rcu_read_lock();
827 hlist_for_each_entry_rcu(mep, &br->mep_list, head)
828 *count += 1;
829 rcu_read_unlock();
830
831 return 0;
832 }
833
834 int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count)
835 {
836 struct br_cfm_peer_mep *peer_mep;
837 struct br_cfm_mep *mep;
838
839 *count = 0;
840
841 rcu_read_lock();
842 hlist_for_each_entry_rcu(mep, &br->mep_list, head)
843 hlist_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head)
844 *count += 1;
845 rcu_read_unlock();
846
847 return 0;
848 }
849
850 bool br_cfm_created(struct net_bridge *br)
851 {
852 return !hlist_empty(&br->mep_list);
853 }
854
855 /* Deletes the CFM instances on a specific bridge port
856 */
857 void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *port)
858 {
859 struct hlist_node *n_store;
860 struct br_cfm_mep *mep;
861
862 ASSERT_RTNL();
863
864 hlist_for_each_entry_safe(mep, n_store, &br->mep_list, head)
865 if (mep->create.ifindex == port->dev->ifindex)
866 mep_delete_implementation(br, mep);
867 }
868
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