1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved.
4 Copyright (c) 2011,2012 Intel Corp.
5
6 */
7
8 #include <net/bluetooth/bluetooth.h>
9 #include <net/bluetooth/hci_core.h>
10 #include <net/bluetooth/l2cap.h>
11
12 #include "hci_request.h"
13 #include "a2mp.h"
14 #include "amp.h"
15
16 #define A2MP_FEAT_EXT 0x8000
17
18 /* Global AMP Manager list */
19 static LIST_HEAD(amp_mgr_list);
20 static DEFINE_MUTEX(amp_mgr_list_lock);
21
22 /* A2MP build & send command helper functions */
__a2mp_build(u8 code,u8 ident,u16 len,void * data)23 static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
24 {
25 struct a2mp_cmd *cmd;
26 int plen;
27
28 plen = sizeof(*cmd) + len;
29 cmd = kzalloc(plen, GFP_KERNEL);
30 if (!cmd)
31 return NULL;
32
33 cmd->code = code;
34 cmd->ident = ident;
35 cmd->len = cpu_to_le16(len);
36
37 memcpy(cmd->data, data, len);
38
39 return cmd;
40 }
41
a2mp_send(struct amp_mgr * mgr,u8 code,u8 ident,u16 len,void * data)42 static void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data)
43 {
44 struct l2cap_chan *chan = mgr->a2mp_chan;
45 struct a2mp_cmd *cmd;
46 u16 total_len = len + sizeof(*cmd);
47 struct kvec iv;
48 struct msghdr msg;
49
50 cmd = __a2mp_build(code, ident, len, data);
51 if (!cmd)
52 return;
53
54 iv.iov_base = cmd;
55 iv.iov_len = total_len;
56
57 memset(&msg, 0, sizeof(msg));
58
59 iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, total_len);
60
61 l2cap_chan_send(chan, &msg, total_len);
62
63 kfree(cmd);
64 }
65
__next_ident(struct amp_mgr * mgr)66 static u8 __next_ident(struct amp_mgr *mgr)
67 {
68 if (++mgr->ident == 0)
69 mgr->ident = 1;
70
71 return mgr->ident;
72 }
73
amp_mgr_lookup_by_state(u8 state)74 static struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
75 {
76 struct amp_mgr *mgr;
77
78 mutex_lock(&_mgr_list_lock);
79 list_for_each_entry(mgr, &_mgr_list, list) {
80 if (test_and_clear_bit(state, &mgr->state)) {
81 amp_mgr_get(mgr);
82 mutex_unlock(&_mgr_list_lock);
83 return mgr;
84 }
85 }
86 mutex_unlock(&_mgr_list_lock);
87
88 return NULL;
89 }
90
91 /* hci_dev_list shall be locked */
__a2mp_add_cl(struct amp_mgr * mgr,struct a2mp_cl * cl)92 static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl)
93 {
94 struct hci_dev *hdev;
95 int i = 1;
96
97 cl[0].id = AMP_ID_BREDR;
98 cl[0].type = AMP_TYPE_BREDR;
99 cl[0].status = AMP_STATUS_BLUETOOTH_ONLY;
100
101 list_for_each_entry(hdev, &hci_dev_list, list) {
102 if (hdev->dev_type == HCI_AMP) {
103 cl[i].id = hdev->id;
104 cl[i].type = hdev->amp_type;
105 if (test_bit(HCI_UP, &hdev->flags))
106 cl[i].status = hdev->amp_status;
107 else
108 cl[i].status = AMP_STATUS_POWERED_DOWN;
109 i++;
110 }
111 }
112 }
113
114 /* Processing A2MP messages */
a2mp_command_rej(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)115 static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
116 struct a2mp_cmd *hdr)
117 {
118 struct a2mp_cmd_rej *rej = (void *) skb->data;
119
120 if (le16_to_cpu(hdr->len) < sizeof(*rej))
121 return -EINVAL;
122
123 BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
124
125 skb_pull(skb, sizeof(*rej));
126
127 return 0;
128 }
129
a2mp_discover_req(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)130 static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
131 struct a2mp_cmd *hdr)
132 {
133 struct a2mp_discov_req *req = (void *) skb->data;
134 u16 len = le16_to_cpu(hdr->len);
135 struct a2mp_discov_rsp *rsp;
136 u16 ext_feat;
137 u8 num_ctrl;
138 struct hci_dev *hdev;
139
140 if (len < sizeof(*req))
141 return -EINVAL;
142
143 skb_pull(skb, sizeof(*req));
144
145 ext_feat = le16_to_cpu(req->ext_feat);
146
147 BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
148
149 /* check that packet is not broken for now */
150 while (ext_feat & A2MP_FEAT_EXT) {
151 if (len < sizeof(ext_feat))
152 return -EINVAL;
153
154 ext_feat = get_unaligned_le16(skb->data);
155 BT_DBG("efm 0x%4.4x", ext_feat);
156 len -= sizeof(ext_feat);
157 skb_pull(skb, sizeof(ext_feat));
158 }
159
160 read_lock(&hci_dev_list_lock);
161
162 /* at minimum the BR/EDR needs to be listed */
163 num_ctrl = 1;
164
165 list_for_each_entry(hdev, &hci_dev_list, list) {
166 if (hdev->dev_type == HCI_AMP)
167 num_ctrl++;
168 }
169
170 len = struct_size(rsp, cl, num_ctrl);
171 rsp = kmalloc(len, GFP_ATOMIC);
172 if (!rsp) {
173 read_unlock(&hci_dev_list_lock);
174 return -ENOMEM;
175 }
176
177 rsp->mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
178 rsp->ext_feat = 0;
179
180 __a2mp_add_cl(mgr, rsp->cl);
181
182 read_unlock(&hci_dev_list_lock);
183
184 a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
185
186 kfree(rsp);
187 return 0;
188 }
189
a2mp_discover_rsp(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)190 static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
191 struct a2mp_cmd *hdr)
192 {
193 struct a2mp_discov_rsp *rsp = (void *) skb->data;
194 u16 len = le16_to_cpu(hdr->len);
195 struct a2mp_cl *cl;
196 u16 ext_feat;
197 bool found = false;
198
199 if (len < sizeof(*rsp))
200 return -EINVAL;
201
202 len -= sizeof(*rsp);
203 skb_pull(skb, sizeof(*rsp));
204
205 ext_feat = le16_to_cpu(rsp->ext_feat);
206
207 BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat);
208
209 /* check that packet is not broken for now */
210 while (ext_feat & A2MP_FEAT_EXT) {
211 if (len < sizeof(ext_feat))
212 return -EINVAL;
213
214 ext_feat = get_unaligned_le16(skb->data);
215 BT_DBG("efm 0x%4.4x", ext_feat);
216 len -= sizeof(ext_feat);
217 skb_pull(skb, sizeof(ext_feat));
218 }
219
220 cl = (void *) skb->data;
221 while (len >= sizeof(*cl)) {
222 BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
223 cl->status);
224
225 if (cl->id != AMP_ID_BREDR && cl->type != AMP_TYPE_BREDR) {
226 struct a2mp_info_req req;
227
228 found = true;
229
230 memset(&req, 0, sizeof(req));
231
232 req.id = cl->id;
233 a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
234 sizeof(req), &req);
235 }
236
237 len -= sizeof(*cl);
238 cl = skb_pull(skb, sizeof(*cl));
239 }
240
241 /* Fall back to L2CAP init sequence */
242 if (!found) {
243 struct l2cap_conn *conn = mgr->l2cap_conn;
244 struct l2cap_chan *chan;
245
246 mutex_lock(&conn->chan_lock);
247
248 list_for_each_entry(chan, &conn->chan_l, list) {
249
250 BT_DBG("chan %p state %s", chan,
251 state_to_string(chan->state));
252
253 if (chan->scid == L2CAP_CID_A2MP)
254 continue;
255
256 l2cap_chan_lock(chan);
257
258 if (chan->state == BT_CONNECT)
259 l2cap_send_conn_req(chan);
260
261 l2cap_chan_unlock(chan);
262 }
263
264 mutex_unlock(&conn->chan_lock);
265 }
266
267 return 0;
268 }
269
a2mp_change_notify(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)270 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
271 struct a2mp_cmd *hdr)
272 {
273 struct a2mp_cl *cl = (void *) skb->data;
274
275 while (skb->len >= sizeof(*cl)) {
276 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
277 cl->status);
278 cl = skb_pull(skb, sizeof(*cl));
279 }
280
281 /* TODO send A2MP_CHANGE_RSP */
282
283 return 0;
284 }
285
read_local_amp_info_complete(struct hci_dev * hdev,u8 status,u16 opcode)286 static void read_local_amp_info_complete(struct hci_dev *hdev, u8 status,
287 u16 opcode)
288 {
289 BT_DBG("%s status 0x%2.2x", hdev->name, status);
290
291 a2mp_send_getinfo_rsp(hdev);
292 }
293
a2mp_getinfo_req(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)294 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
295 struct a2mp_cmd *hdr)
296 {
297 struct a2mp_info_req *req = (void *) skb->data;
298 struct hci_dev *hdev;
299 struct hci_request hreq;
300 int err = 0;
301
302 if (le16_to_cpu(hdr->len) < sizeof(*req))
303 return -EINVAL;
304
305 BT_DBG("id %d", req->id);
306
307 hdev = hci_dev_get(req->id);
308 if (!hdev || hdev->dev_type != HCI_AMP) {
309 struct a2mp_info_rsp rsp;
310
311 memset(&rsp, 0, sizeof(rsp));
312
313 rsp.id = req->id;
314 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
315
316 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
317 &rsp);
318
319 goto done;
320 }
321
322 set_bit(READ_LOC_AMP_INFO, &mgr->state);
323 hci_req_init(&hreq, hdev);
324 hci_req_add(&hreq, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
325 err = hci_req_run(&hreq, read_local_amp_info_complete);
326 if (err < 0)
327 a2mp_send_getinfo_rsp(hdev);
328
329 done:
330 if (hdev)
331 hci_dev_put(hdev);
332
333 skb_pull(skb, sizeof(*req));
334 return 0;
335 }
336
a2mp_getinfo_rsp(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)337 static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
338 struct a2mp_cmd *hdr)
339 {
340 struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
341 struct a2mp_amp_assoc_req req;
342 struct amp_ctrl *ctrl;
343
344 if (le16_to_cpu(hdr->len) < sizeof(*rsp))
345 return -EINVAL;
346
347 BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
348
349 if (rsp->status)
350 return -EINVAL;
351
352 ctrl = amp_ctrl_add(mgr, rsp->id);
353 if (!ctrl)
354 return -ENOMEM;
355
356 memset(&req, 0, sizeof(req));
357
358 req.id = rsp->id;
359 a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
360 &req);
361
362 skb_pull(skb, sizeof(*rsp));
363 return 0;
364 }
365
a2mp_getampassoc_req(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)366 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
367 struct a2mp_cmd *hdr)
368 {
369 struct a2mp_amp_assoc_req *req = (void *) skb->data;
370 struct hci_dev *hdev;
371 struct amp_mgr *tmp;
372
373 if (le16_to_cpu(hdr->len) < sizeof(*req))
374 return -EINVAL;
375
376 BT_DBG("id %d", req->id);
377
378 /* Make sure that other request is not processed */
379 tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
380
381 hdev = hci_dev_get(req->id);
382 if (!hdev || hdev->amp_type == AMP_TYPE_BREDR || tmp) {
383 struct a2mp_amp_assoc_rsp rsp;
384 rsp.id = req->id;
385
386 memset(&rsp, 0, sizeof(rsp));
387
388 if (tmp) {
389 rsp.status = A2MP_STATUS_COLLISION_OCCURED;
390 amp_mgr_put(tmp);
391 } else {
392 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
393 }
394
395 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
396 &rsp);
397
398 goto done;
399 }
400
401 amp_read_loc_assoc(hdev, mgr);
402
403 done:
404 if (hdev)
405 hci_dev_put(hdev);
406
407 skb_pull(skb, sizeof(*req));
408 return 0;
409 }
410
a2mp_getampassoc_rsp(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)411 static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
412 struct a2mp_cmd *hdr)
413 {
414 struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
415 u16 len = le16_to_cpu(hdr->len);
416 struct hci_dev *hdev;
417 struct amp_ctrl *ctrl;
418 struct hci_conn *hcon;
419 size_t assoc_len;
420
421 if (len < sizeof(*rsp))
422 return -EINVAL;
423
424 assoc_len = len - sizeof(*rsp);
425
426 BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status,
427 assoc_len);
428
429 if (rsp->status)
430 return -EINVAL;
431
432 /* Save remote ASSOC data */
433 ctrl = amp_ctrl_lookup(mgr, rsp->id);
434 if (ctrl) {
435 u8 *assoc;
436
437 assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL);
438 if (!assoc) {
439 amp_ctrl_put(ctrl);
440 return -ENOMEM;
441 }
442
443 ctrl->assoc = assoc;
444 ctrl->assoc_len = assoc_len;
445 ctrl->assoc_rem_len = assoc_len;
446 ctrl->assoc_len_so_far = 0;
447
448 amp_ctrl_put(ctrl);
449 }
450
451 /* Create Phys Link */
452 hdev = hci_dev_get(rsp->id);
453 if (!hdev)
454 return -EINVAL;
455
456 hcon = phylink_add(hdev, mgr, rsp->id, true);
457 if (!hcon)
458 goto done;
459
460 BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
461
462 mgr->bredr_chan->remote_amp_id = rsp->id;
463
464 amp_create_phylink(hdev, mgr, hcon);
465
466 done:
467 hci_dev_put(hdev);
468 skb_pull(skb, len);
469 return 0;
470 }
471
a2mp_createphyslink_req(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)472 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
473 struct a2mp_cmd *hdr)
474 {
475 struct a2mp_physlink_req *req = (void *) skb->data;
476 struct a2mp_physlink_rsp rsp;
477 struct hci_dev *hdev;
478 struct hci_conn *hcon;
479 struct amp_ctrl *ctrl;
480
481 if (le16_to_cpu(hdr->len) < sizeof(*req))
482 return -EINVAL;
483
484 BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
485
486 memset(&rsp, 0, sizeof(rsp));
487
488 rsp.local_id = req->remote_id;
489 rsp.remote_id = req->local_id;
490
491 hdev = hci_dev_get(req->remote_id);
492 if (!hdev || hdev->amp_type == AMP_TYPE_BREDR) {
493 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
494 goto send_rsp;
495 }
496
497 ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
498 if (!ctrl) {
499 ctrl = amp_ctrl_add(mgr, rsp.remote_id);
500 if (ctrl) {
501 amp_ctrl_get(ctrl);
502 } else {
503 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
504 goto send_rsp;
505 }
506 }
507
508 if (ctrl) {
509 size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
510 u8 *assoc;
511
512 assoc = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL);
513 if (!assoc) {
514 amp_ctrl_put(ctrl);
515 return -ENOMEM;
516 }
517
518 ctrl->assoc = assoc;
519 ctrl->assoc_len = assoc_len;
520 ctrl->assoc_rem_len = assoc_len;
521 ctrl->assoc_len_so_far = 0;
522
523 amp_ctrl_put(ctrl);
524 }
525
526 hcon = phylink_add(hdev, mgr, req->local_id, false);
527 if (hcon) {
528 amp_accept_phylink(hdev, mgr, hcon);
529 rsp.status = A2MP_STATUS_SUCCESS;
530 } else {
531 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
532 }
533
534 send_rsp:
535 if (hdev)
536 hci_dev_put(hdev);
537
538 /* Reply error now and success after HCI Write Remote AMP Assoc
539 command complete with success status
540 */
541 if (rsp.status != A2MP_STATUS_SUCCESS) {
542 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident,
543 sizeof(rsp), &rsp);
544 } else {
545 set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state);
546 mgr->ident = hdr->ident;
547 }
548
549 skb_pull(skb, le16_to_cpu(hdr->len));
550 return 0;
551 }
552
a2mp_discphyslink_req(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)553 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
554 struct a2mp_cmd *hdr)
555 {
556 struct a2mp_physlink_req *req = (void *) skb->data;
557 struct a2mp_physlink_rsp rsp;
558 struct hci_dev *hdev;
559 struct hci_conn *hcon;
560
561 if (le16_to_cpu(hdr->len) < sizeof(*req))
562 return -EINVAL;
563
564 BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
565
566 memset(&rsp, 0, sizeof(rsp));
567
568 rsp.local_id = req->remote_id;
569 rsp.remote_id = req->local_id;
570 rsp.status = A2MP_STATUS_SUCCESS;
571
572 hdev = hci_dev_get(req->remote_id);
573 if (!hdev) {
574 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
575 goto send_rsp;
576 }
577
578 hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
579 &mgr->l2cap_conn->hcon->dst);
580 if (!hcon) {
581 bt_dev_err(hdev, "no phys link exist");
582 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
583 goto clean;
584 }
585
586 /* TODO Disconnect Phys Link here */
587
588 clean:
589 hci_dev_put(hdev);
590
591 send_rsp:
592 a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
593
594 skb_pull(skb, sizeof(*req));
595 return 0;
596 }
597
a2mp_cmd_rsp(struct amp_mgr * mgr,struct sk_buff * skb,struct a2mp_cmd * hdr)598 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
599 struct a2mp_cmd *hdr)
600 {
601 BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
602
603 skb_pull(skb, le16_to_cpu(hdr->len));
604 return 0;
605 }
606
607 /* Handle A2MP signalling */
a2mp_chan_recv_cb(struct l2cap_chan * chan,struct sk_buff * skb)608 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
609 {
610 struct a2mp_cmd *hdr;
611 struct amp_mgr *mgr = chan->data;
612 int err = 0;
613
614 amp_mgr_get(mgr);
615
616 while (skb->len >= sizeof(*hdr)) {
617 u16 len;
618
619 hdr = (void *) skb->data;
620 len = le16_to_cpu(hdr->len);
621
622 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
623
624 skb_pull(skb, sizeof(*hdr));
625
626 if (len > skb->len || !hdr->ident) {
627 err = -EINVAL;
628 break;
629 }
630
631 mgr->ident = hdr->ident;
632
633 switch (hdr->code) {
634 case A2MP_COMMAND_REJ:
635 a2mp_command_rej(mgr, skb, hdr);
636 break;
637
638 case A2MP_DISCOVER_REQ:
639 err = a2mp_discover_req(mgr, skb, hdr);
640 break;
641
642 case A2MP_CHANGE_NOTIFY:
643 err = a2mp_change_notify(mgr, skb, hdr);
644 break;
645
646 case A2MP_GETINFO_REQ:
647 err = a2mp_getinfo_req(mgr, skb, hdr);
648 break;
649
650 case A2MP_GETAMPASSOC_REQ:
651 err = a2mp_getampassoc_req(mgr, skb, hdr);
652 break;
653
654 case A2MP_CREATEPHYSLINK_REQ:
655 err = a2mp_createphyslink_req(mgr, skb, hdr);
656 break;
657
658 case A2MP_DISCONNPHYSLINK_REQ:
659 err = a2mp_discphyslink_req(mgr, skb, hdr);
660 break;
661
662 case A2MP_DISCOVER_RSP:
663 err = a2mp_discover_rsp(mgr, skb, hdr);
664 break;
665
666 case A2MP_GETINFO_RSP:
667 err = a2mp_getinfo_rsp(mgr, skb, hdr);
668 break;
669
670 case A2MP_GETAMPASSOC_RSP:
671 err = a2mp_getampassoc_rsp(mgr, skb, hdr);
672 break;
673
674 case A2MP_CHANGE_RSP:
675 case A2MP_CREATEPHYSLINK_RSP:
676 case A2MP_DISCONNPHYSLINK_RSP:
677 err = a2mp_cmd_rsp(mgr, skb, hdr);
678 break;
679
680 default:
681 BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
682 err = -EINVAL;
683 break;
684 }
685 }
686
687 if (err) {
688 struct a2mp_cmd_rej rej;
689
690 memset(&rej, 0, sizeof(rej));
691
692 rej.reason = cpu_to_le16(0);
693 hdr = (void *) skb->data;
694
695 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
696
697 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
698 &rej);
699 }
700
701 /* Always free skb and return success error code to prevent
702 from sending L2CAP Disconnect over A2MP channel */
703 kfree_skb(skb);
704
705 amp_mgr_put(mgr);
706
707 return 0;
708 }
709
a2mp_chan_close_cb(struct l2cap_chan * chan)710 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
711 {
712 l2cap_chan_put(chan);
713 }
714
a2mp_chan_state_change_cb(struct l2cap_chan * chan,int state,int err)715 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state,
716 int err)
717 {
718 struct amp_mgr *mgr = chan->data;
719
720 if (!mgr)
721 return;
722
723 BT_DBG("chan %p state %s", chan, state_to_string(state));
724
725 chan->state = state;
726
727 switch (state) {
728 case BT_CLOSED:
729 if (mgr)
730 amp_mgr_put(mgr);
731 break;
732 }
733 }
734
a2mp_chan_alloc_skb_cb(struct l2cap_chan * chan,unsigned long hdr_len,unsigned long len,int nb)735 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
736 unsigned long hdr_len,
737 unsigned long len, int nb)
738 {
739 struct sk_buff *skb;
740
741 skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
742 if (!skb)
743 return ERR_PTR(-ENOMEM);
744
745 return skb;
746 }
747
748 static const struct l2cap_ops a2mp_chan_ops = {
749 .name = "L2CAP A2MP channel",
750 .recv = a2mp_chan_recv_cb,
751 .close = a2mp_chan_close_cb,
752 .state_change = a2mp_chan_state_change_cb,
753 .alloc_skb = a2mp_chan_alloc_skb_cb,
754
755 /* Not implemented for A2MP */
756 .new_connection = l2cap_chan_no_new_connection,
757 .teardown = l2cap_chan_no_teardown,
758 .ready = l2cap_chan_no_ready,
759 .defer = l2cap_chan_no_defer,
760 .resume = l2cap_chan_no_resume,
761 .set_shutdown = l2cap_chan_no_set_shutdown,
762 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
763 };
764
a2mp_chan_open(struct l2cap_conn * conn,bool locked)765 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
766 {
767 struct l2cap_chan *chan;
768 int err;
769
770 chan = l2cap_chan_create();
771 if (!chan)
772 return NULL;
773
774 BT_DBG("chan %p", chan);
775
776 chan->chan_type = L2CAP_CHAN_FIXED;
777 chan->scid = L2CAP_CID_A2MP;
778 chan->dcid = L2CAP_CID_A2MP;
779 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
780 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
781 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
782
783 chan->ops = &a2mp_chan_ops;
784
785 l2cap_chan_set_defaults(chan);
786 chan->remote_max_tx = chan->max_tx;
787 chan->remote_tx_win = chan->tx_win;
788
789 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
790 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
791
792 skb_queue_head_init(&chan->tx_q);
793
794 chan->mode = L2CAP_MODE_ERTM;
795
796 err = l2cap_ertm_init(chan);
797 if (err < 0) {
798 l2cap_chan_del(chan, 0);
799 return NULL;
800 }
801
802 chan->conf_state = 0;
803
804 if (locked)
805 __l2cap_chan_add(conn, chan);
806 else
807 l2cap_chan_add(conn, chan);
808
809 chan->remote_mps = chan->omtu;
810 chan->mps = chan->omtu;
811
812 chan->state = BT_CONNECTED;
813
814 return chan;
815 }
816
817 /* AMP Manager functions */
amp_mgr_get(struct amp_mgr * mgr)818 struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
819 {
820 BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
821
822 kref_get(&mgr->kref);
823
824 return mgr;
825 }
826
amp_mgr_destroy(struct kref * kref)827 static void amp_mgr_destroy(struct kref *kref)
828 {
829 struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
830
831 BT_DBG("mgr %p", mgr);
832
833 mutex_lock(&_mgr_list_lock);
834 list_del(&mgr->list);
835 mutex_unlock(&_mgr_list_lock);
836
837 amp_ctrl_list_flush(mgr);
838 kfree(mgr);
839 }
840
amp_mgr_put(struct amp_mgr * mgr)841 int amp_mgr_put(struct amp_mgr *mgr)
842 {
843 BT_DBG("mgr %p orig refcnt %d", mgr, kref_read(&mgr->kref));
844
845 return kref_put(&mgr->kref, &_mgr_destroy);
846 }
847
amp_mgr_create(struct l2cap_conn * conn,bool locked)848 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
849 {
850 struct amp_mgr *mgr;
851 struct l2cap_chan *chan;
852
853 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
854 if (!mgr)
855 return NULL;
856
857 BT_DBG("conn %p mgr %p", conn, mgr);
858
859 mgr->l2cap_conn = conn;
860
861 chan = a2mp_chan_open(conn, locked);
862 if (!chan) {
863 kfree(mgr);
864 return NULL;
865 }
866
867 mgr->a2mp_chan = chan;
868 chan->data = mgr;
869
870 conn->hcon->amp_mgr = mgr;
871
872 kref_init(&mgr->kref);
873
874 /* Remote AMP ctrl list initialization */
875 INIT_LIST_HEAD(&mgr->amp_ctrls);
876 mutex_init(&mgr->amp_ctrls_lock);
877
878 mutex_lock(&_mgr_list_lock);
879 list_add(&mgr->list, &_mgr_list);
880 mutex_unlock(&_mgr_list_lock);
881
882 return mgr;
883 }
884
a2mp_channel_create(struct l2cap_conn * conn,struct sk_buff * skb)885 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
886 struct sk_buff *skb)
887 {
888 struct amp_mgr *mgr;
889
890 if (conn->hcon->type != ACL_LINK)
891 return NULL;
892
893 mgr = amp_mgr_create(conn, false);
894 if (!mgr) {
895 BT_ERR("Could not create AMP manager");
896 return NULL;
897 }
898
899 BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
900
901 return mgr->a2mp_chan;
902 }
903
a2mp_send_getinfo_rsp(struct hci_dev * hdev)904 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
905 {
906 struct amp_mgr *mgr;
907 struct a2mp_info_rsp rsp;
908
909 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
910 if (!mgr)
911 return;
912
913 BT_DBG("%s mgr %p", hdev->name, mgr);
914
915 memset(&rsp, 0, sizeof(rsp));
916
917 rsp.id = hdev->id;
918 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
919
920 if (hdev->amp_type != AMP_TYPE_BREDR) {
921 rsp.status = 0;
922 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
923 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
924 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
925 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
926 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
927 }
928
929 a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
930 amp_mgr_put(mgr);
931 }
932
a2mp_send_getampassoc_rsp(struct hci_dev * hdev,u8 status)933 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
934 {
935 struct amp_mgr *mgr;
936 struct amp_assoc *loc_assoc = &hdev->loc_assoc;
937 struct a2mp_amp_assoc_rsp *rsp;
938 size_t len;
939
940 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
941 if (!mgr)
942 return;
943
944 BT_DBG("%s mgr %p", hdev->name, mgr);
945
946 len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
947 rsp = kzalloc(len, GFP_KERNEL);
948 if (!rsp) {
949 amp_mgr_put(mgr);
950 return;
951 }
952
953 rsp->id = hdev->id;
954
955 if (status) {
956 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
957 } else {
958 rsp->status = A2MP_STATUS_SUCCESS;
959 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
960 }
961
962 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
963 amp_mgr_put(mgr);
964 kfree(rsp);
965 }
966
a2mp_send_create_phy_link_req(struct hci_dev * hdev,u8 status)967 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
968 {
969 struct amp_mgr *mgr;
970 struct amp_assoc *loc_assoc = &hdev->loc_assoc;
971 struct a2mp_physlink_req *req;
972 struct l2cap_chan *bredr_chan;
973 size_t len;
974
975 mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
976 if (!mgr)
977 return;
978
979 len = sizeof(*req) + loc_assoc->len;
980
981 BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
982
983 req = kzalloc(len, GFP_KERNEL);
984 if (!req) {
985 amp_mgr_put(mgr);
986 return;
987 }
988
989 bredr_chan = mgr->bredr_chan;
990 if (!bredr_chan)
991 goto clean;
992
993 req->local_id = hdev->id;
994 req->remote_id = bredr_chan->remote_amp_id;
995 memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
996
997 a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
998
999 clean:
1000 amp_mgr_put(mgr);
1001 kfree(req);
1002 }
1003
a2mp_send_create_phy_link_rsp(struct hci_dev * hdev,u8 status)1004 void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
1005 {
1006 struct amp_mgr *mgr;
1007 struct a2mp_physlink_rsp rsp;
1008 struct hci_conn *hs_hcon;
1009
1010 mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC);
1011 if (!mgr)
1012 return;
1013
1014 memset(&rsp, 0, sizeof(rsp));
1015
1016 hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
1017 if (!hs_hcon) {
1018 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
1019 } else {
1020 rsp.remote_id = hs_hcon->remote_id;
1021 rsp.status = A2MP_STATUS_SUCCESS;
1022 }
1023
1024 BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon,
1025 status);
1026
1027 rsp.local_id = hdev->id;
1028 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp);
1029 amp_mgr_put(mgr);
1030 }
1031
a2mp_discover_amp(struct l2cap_chan * chan)1032 void a2mp_discover_amp(struct l2cap_chan *chan)
1033 {
1034 struct l2cap_conn *conn = chan->conn;
1035 struct amp_mgr *mgr = conn->hcon->amp_mgr;
1036 struct a2mp_discov_req req;
1037
1038 BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
1039
1040 if (!mgr) {
1041 mgr = amp_mgr_create(conn, true);
1042 if (!mgr)
1043 return;
1044 }
1045
1046 mgr->bredr_chan = chan;
1047
1048 memset(&req, 0, sizeof(req));
1049
1050 req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
1051 req.ext_feat = 0;
1052 a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
1053 }
1054