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Linux/net/bluetooth/a2mp.c

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  1 /*
  2    Copyright (c) 2010,2011 Code Aurora Forum.  All rights reserved.
  3    Copyright (c) 2011,2012 Intel Corp.
  4 
  5    This program is free software; you can redistribute it and/or modify
  6    it under the terms of the GNU General Public License version 2 and
  7    only version 2 as published by the Free Software Foundation.
  8 
  9    This program is distributed in the hope that it will be useful,
 10    but WITHOUT ANY WARRANTY; without even the implied warranty of
 11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12    GNU General Public License for more details.
 13 */
 14 
 15 #include <net/bluetooth/bluetooth.h>
 16 #include <net/bluetooth/hci_core.h>
 17 #include <net/bluetooth/l2cap.h>
 18 #include <net/bluetooth/a2mp.h>
 19 #include <net/bluetooth/amp.h>
 20 
 21 /* Global AMP Manager list */
 22 LIST_HEAD(amp_mgr_list);
 23 DEFINE_MUTEX(amp_mgr_list_lock);
 24 
 25 /* A2MP build & send command helper functions */
 26 static struct a2mp_cmd *__a2mp_build(u8 code, u8 ident, u16 len, void *data)
 27 {
 28         struct a2mp_cmd *cmd;
 29         int plen;
 30 
 31         plen = sizeof(*cmd) + len;
 32         cmd = kzalloc(plen, GFP_KERNEL);
 33         if (!cmd)
 34                 return NULL;
 35 
 36         cmd->code = code;
 37         cmd->ident = ident;
 38         cmd->len = cpu_to_le16(len);
 39 
 40         memcpy(cmd->data, data, len);
 41 
 42         return cmd;
 43 }
 44 
 45 void a2mp_send(struct amp_mgr *mgr, u8 code, u8 ident, u16 len, void *data)
 46 {
 47         struct l2cap_chan *chan = mgr->a2mp_chan;
 48         struct a2mp_cmd *cmd;
 49         u16 total_len = len + sizeof(*cmd);
 50         struct kvec iv;
 51         struct msghdr msg;
 52 
 53         cmd = __a2mp_build(code, ident, len, data);
 54         if (!cmd)
 55                 return;
 56 
 57         iv.iov_base = cmd;
 58         iv.iov_len = total_len;
 59 
 60         memset(&msg, 0, sizeof(msg));
 61 
 62         msg.msg_iov = (struct iovec *) &iv;
 63         msg.msg_iovlen = 1;
 64 
 65         l2cap_chan_send(chan, &msg, total_len, 0);
 66 
 67         kfree(cmd);
 68 }
 69 
 70 u8 __next_ident(struct amp_mgr *mgr)
 71 {
 72         if (++mgr->ident == 0)
 73                 mgr->ident = 1;
 74 
 75         return mgr->ident;
 76 }
 77 
 78 static inline void __a2mp_cl_bredr(struct a2mp_cl *cl)
 79 {
 80         cl->id = 0;
 81         cl->type = 0;
 82         cl->status = 1;
 83 }
 84 
 85 /* hci_dev_list shall be locked */
 86 static void __a2mp_add_cl(struct amp_mgr *mgr, struct a2mp_cl *cl, u8 num_ctrl)
 87 {
 88         int i = 0;
 89         struct hci_dev *hdev;
 90 
 91         __a2mp_cl_bredr(cl);
 92 
 93         list_for_each_entry(hdev, &hci_dev_list, list) {
 94                 /* Iterate through AMP controllers */
 95                 if (hdev->id == HCI_BREDR_ID)
 96                         continue;
 97 
 98                 /* Starting from second entry */
 99                 if (++i >= num_ctrl)
100                         return;
101 
102                 cl[i].id = hdev->id;
103                 cl[i].type = hdev->amp_type;
104                 cl[i].status = hdev->amp_status;
105         }
106 }
107 
108 /* Processing A2MP messages */
109 static int a2mp_command_rej(struct amp_mgr *mgr, struct sk_buff *skb,
110                             struct a2mp_cmd *hdr)
111 {
112         struct a2mp_cmd_rej *rej = (void *) skb->data;
113 
114         if (le16_to_cpu(hdr->len) < sizeof(*rej))
115                 return -EINVAL;
116 
117         BT_DBG("ident %d reason %d", hdr->ident, le16_to_cpu(rej->reason));
118 
119         skb_pull(skb, sizeof(*rej));
120 
121         return 0;
122 }
123 
124 static int a2mp_discover_req(struct amp_mgr *mgr, struct sk_buff *skb,
125                              struct a2mp_cmd *hdr)
126 {
127         struct a2mp_discov_req *req = (void *) skb->data;
128         u16 len = le16_to_cpu(hdr->len);
129         struct a2mp_discov_rsp *rsp;
130         u16 ext_feat;
131         u8 num_ctrl;
132 
133         if (len < sizeof(*req))
134                 return -EINVAL;
135 
136         skb_pull(skb, sizeof(*req));
137 
138         ext_feat = le16_to_cpu(req->ext_feat);
139 
140         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(req->mtu), ext_feat);
141 
142         /* check that packet is not broken for now */
143         while (ext_feat & A2MP_FEAT_EXT) {
144                 if (len < sizeof(ext_feat))
145                         return -EINVAL;
146 
147                 ext_feat = get_unaligned_le16(skb->data);
148                 BT_DBG("efm 0x%4.4x", ext_feat);
149                 len -= sizeof(ext_feat);
150                 skb_pull(skb, sizeof(ext_feat));
151         }
152 
153         read_lock(&hci_dev_list_lock);
154 
155         num_ctrl = __hci_num_ctrl();
156         len = num_ctrl * sizeof(struct a2mp_cl) + sizeof(*rsp);
157         rsp = kmalloc(len, GFP_ATOMIC);
158         if (!rsp) {
159                 read_unlock(&hci_dev_list_lock);
160                 return -ENOMEM;
161         }
162 
163         rsp->mtu = __constant_cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
164         rsp->ext_feat = 0;
165 
166         __a2mp_add_cl(mgr, rsp->cl, num_ctrl);
167 
168         read_unlock(&hci_dev_list_lock);
169 
170         a2mp_send(mgr, A2MP_DISCOVER_RSP, hdr->ident, len, rsp);
171 
172         kfree(rsp);
173         return 0;
174 }
175 
176 static int a2mp_discover_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
177                              struct a2mp_cmd *hdr)
178 {
179         struct a2mp_discov_rsp *rsp = (void *) skb->data;
180         u16 len = le16_to_cpu(hdr->len);
181         struct a2mp_cl *cl;
182         u16 ext_feat;
183         bool found = false;
184 
185         if (len < sizeof(*rsp))
186                 return -EINVAL;
187 
188         len -= sizeof(*rsp);
189         skb_pull(skb, sizeof(*rsp));
190 
191         ext_feat = le16_to_cpu(rsp->ext_feat);
192 
193         BT_DBG("mtu %d efm 0x%4.4x", le16_to_cpu(rsp->mtu), ext_feat);
194 
195         /* check that packet is not broken for now */
196         while (ext_feat & A2MP_FEAT_EXT) {
197                 if (len < sizeof(ext_feat))
198                         return -EINVAL;
199 
200                 ext_feat = get_unaligned_le16(skb->data);
201                 BT_DBG("efm 0x%4.4x", ext_feat);
202                 len -= sizeof(ext_feat);
203                 skb_pull(skb, sizeof(ext_feat));
204         }
205 
206         cl = (void *) skb->data;
207         while (len >= sizeof(*cl)) {
208                 BT_DBG("Remote AMP id %d type %d status %d", cl->id, cl->type,
209                        cl->status);
210 
211                 if (cl->id != HCI_BREDR_ID && cl->type == HCI_AMP) {
212                         struct a2mp_info_req req;
213 
214                         found = true;
215                         req.id = cl->id;
216                         a2mp_send(mgr, A2MP_GETINFO_REQ, __next_ident(mgr),
217                                   sizeof(req), &req);
218                 }
219 
220                 len -= sizeof(*cl);
221                 cl = (void *) skb_pull(skb, sizeof(*cl));
222         }
223 
224         /* Fall back to L2CAP init sequence */
225         if (!found) {
226                 struct l2cap_conn *conn = mgr->l2cap_conn;
227                 struct l2cap_chan *chan;
228 
229                 mutex_lock(&conn->chan_lock);
230 
231                 list_for_each_entry(chan, &conn->chan_l, list) {
232 
233                         BT_DBG("chan %p state %s", chan,
234                                state_to_string(chan->state));
235 
236                         if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP)
237                                 continue;
238 
239                         l2cap_chan_lock(chan);
240 
241                         if (chan->state == BT_CONNECT)
242                                 l2cap_send_conn_req(chan);
243 
244                         l2cap_chan_unlock(chan);
245                 }
246 
247                 mutex_unlock(&conn->chan_lock);
248         }
249 
250         return 0;
251 }
252 
253 static int a2mp_change_notify(struct amp_mgr *mgr, struct sk_buff *skb,
254                               struct a2mp_cmd *hdr)
255 {
256         struct a2mp_cl *cl = (void *) skb->data;
257 
258         while (skb->len >= sizeof(*cl)) {
259                 BT_DBG("Controller id %d type %d status %d", cl->id, cl->type,
260                        cl->status);
261                 cl = (struct a2mp_cl *) skb_pull(skb, sizeof(*cl));
262         }
263 
264         /* TODO send A2MP_CHANGE_RSP */
265 
266         return 0;
267 }
268 
269 static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
270                             struct a2mp_cmd *hdr)
271 {
272         struct a2mp_info_req *req  = (void *) skb->data;
273         struct hci_dev *hdev;
274 
275         if (le16_to_cpu(hdr->len) < sizeof(*req))
276                 return -EINVAL;
277 
278         BT_DBG("id %d", req->id);
279 
280         hdev = hci_dev_get(req->id);
281         if (!hdev || hdev->dev_type != HCI_AMP) {
282                 struct a2mp_info_rsp rsp;
283 
284                 rsp.id = req->id;
285                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
286 
287                 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
288                           &rsp);
289 
290                 goto done;
291         }
292 
293         set_bit(READ_LOC_AMP_INFO, &mgr->state);
294         hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
295 
296 done:
297         if (hdev)
298                 hci_dev_put(hdev);
299 
300         skb_pull(skb, sizeof(*req));
301         return 0;
302 }
303 
304 static int a2mp_getinfo_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
305                             struct a2mp_cmd *hdr)
306 {
307         struct a2mp_info_rsp *rsp = (struct a2mp_info_rsp *) skb->data;
308         struct a2mp_amp_assoc_req req;
309         struct amp_ctrl *ctrl;
310 
311         if (le16_to_cpu(hdr->len) < sizeof(*rsp))
312                 return -EINVAL;
313 
314         BT_DBG("id %d status 0x%2.2x", rsp->id, rsp->status);
315 
316         if (rsp->status)
317                 return -EINVAL;
318 
319         ctrl = amp_ctrl_add(mgr, rsp->id);
320         if (!ctrl)
321                 return -ENOMEM;
322 
323         req.id = rsp->id;
324         a2mp_send(mgr, A2MP_GETAMPASSOC_REQ, __next_ident(mgr), sizeof(req),
325                   &req);
326 
327         skb_pull(skb, sizeof(*rsp));
328         return 0;
329 }
330 
331 static int a2mp_getampassoc_req(struct amp_mgr *mgr, struct sk_buff *skb,
332                                 struct a2mp_cmd *hdr)
333 {
334         struct a2mp_amp_assoc_req *req = (void *) skb->data;
335         struct hci_dev *hdev;
336         struct amp_mgr *tmp;
337 
338         if (le16_to_cpu(hdr->len) < sizeof(*req))
339                 return -EINVAL;
340 
341         BT_DBG("id %d", req->id);
342 
343         /* Make sure that other request is not processed */
344         tmp = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
345 
346         hdev = hci_dev_get(req->id);
347         if (!hdev || hdev->amp_type == HCI_BREDR || tmp) {
348                 struct a2mp_amp_assoc_rsp rsp;
349                 rsp.id = req->id;
350 
351                 if (tmp) {
352                         rsp.status = A2MP_STATUS_COLLISION_OCCURED;
353                         amp_mgr_put(tmp);
354                 } else {
355                         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
356                 }
357 
358                 a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, hdr->ident, sizeof(rsp),
359                           &rsp);
360 
361                 goto done;
362         }
363 
364         amp_read_loc_assoc(hdev, mgr);
365 
366 done:
367         if (hdev)
368                 hci_dev_put(hdev);
369 
370         skb_pull(skb, sizeof(*req));
371         return 0;
372 }
373 
374 static int a2mp_getampassoc_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
375                                 struct a2mp_cmd *hdr)
376 {
377         struct a2mp_amp_assoc_rsp *rsp = (void *) skb->data;
378         u16 len = le16_to_cpu(hdr->len);
379         struct hci_dev *hdev;
380         struct amp_ctrl *ctrl;
381         struct hci_conn *hcon;
382         size_t assoc_len;
383 
384         if (len < sizeof(*rsp))
385                 return -EINVAL;
386 
387         assoc_len = len - sizeof(*rsp);
388 
389         BT_DBG("id %d status 0x%2.2x assoc len %zu", rsp->id, rsp->status,
390                assoc_len);
391 
392         if (rsp->status)
393                 return -EINVAL;
394 
395         /* Save remote ASSOC data */
396         ctrl = amp_ctrl_lookup(mgr, rsp->id);
397         if (ctrl) {
398                 u8 *assoc;
399 
400                 assoc = kmemdup(rsp->amp_assoc, assoc_len, GFP_KERNEL);
401                 if (!assoc) {
402                         amp_ctrl_put(ctrl);
403                         return -ENOMEM;
404                 }
405 
406                 ctrl->assoc = assoc;
407                 ctrl->assoc_len = assoc_len;
408                 ctrl->assoc_rem_len = assoc_len;
409                 ctrl->assoc_len_so_far = 0;
410 
411                 amp_ctrl_put(ctrl);
412         }
413 
414         /* Create Phys Link */
415         hdev = hci_dev_get(rsp->id);
416         if (!hdev)
417                 return -EINVAL;
418 
419         hcon = phylink_add(hdev, mgr, rsp->id, true);
420         if (!hcon)
421                 goto done;
422 
423         BT_DBG("Created hcon %p: loc:%d -> rem:%d", hcon, hdev->id, rsp->id);
424 
425         mgr->bredr_chan->remote_amp_id = rsp->id;
426 
427         amp_create_phylink(hdev, mgr, hcon);
428 
429 done:
430         hci_dev_put(hdev);
431         skb_pull(skb, len);
432         return 0;
433 }
434 
435 static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
436                                    struct a2mp_cmd *hdr)
437 {
438         struct a2mp_physlink_req *req = (void *) skb->data;
439 
440         struct a2mp_physlink_rsp rsp;
441         struct hci_dev *hdev;
442         struct hci_conn *hcon;
443         struct amp_ctrl *ctrl;
444 
445         if (le16_to_cpu(hdr->len) < sizeof(*req))
446                 return -EINVAL;
447 
448         BT_DBG("local_id %d, remote_id %d", req->local_id, req->remote_id);
449 
450         rsp.local_id = req->remote_id;
451         rsp.remote_id = req->local_id;
452 
453         hdev = hci_dev_get(req->remote_id);
454         if (!hdev || hdev->amp_type != HCI_AMP) {
455                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
456                 goto send_rsp;
457         }
458 
459         ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
460         if (!ctrl) {
461                 ctrl = amp_ctrl_add(mgr, rsp.remote_id);
462                 if (ctrl) {
463                         amp_ctrl_get(ctrl);
464                 } else {
465                         rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
466                         goto send_rsp;
467                 }
468         }
469 
470         if (ctrl) {
471                 size_t assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
472                 u8 *assoc;
473 
474                 assoc = kmemdup(req->amp_assoc, assoc_len, GFP_KERNEL);
475                 if (!assoc) {
476                         amp_ctrl_put(ctrl);
477                         return -ENOMEM;
478                 }
479 
480                 ctrl->assoc = assoc;
481                 ctrl->assoc_len = assoc_len;
482                 ctrl->assoc_rem_len = assoc_len;
483                 ctrl->assoc_len_so_far = 0;
484 
485                 amp_ctrl_put(ctrl);
486         }
487 
488         hcon = phylink_add(hdev, mgr, req->local_id, false);
489         if (hcon) {
490                 amp_accept_phylink(hdev, mgr, hcon);
491                 rsp.status = A2MP_STATUS_SUCCESS;
492         } else {
493                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
494         }
495 
496 send_rsp:
497         if (hdev)
498                 hci_dev_put(hdev);
499 
500         /* Reply error now and success after HCI Write Remote AMP Assoc
501            command complete with success status
502          */
503         if (rsp.status != A2MP_STATUS_SUCCESS) {
504                 a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, hdr->ident,
505                           sizeof(rsp), &rsp);
506         } else {
507                 set_bit(WRITE_REMOTE_AMP_ASSOC, &mgr->state);
508                 mgr->ident = hdr->ident;
509         }
510 
511         skb_pull(skb, le16_to_cpu(hdr->len));
512         return 0;
513 }
514 
515 static int a2mp_discphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
516                                  struct a2mp_cmd *hdr)
517 {
518         struct a2mp_physlink_req *req = (void *) skb->data;
519         struct a2mp_physlink_rsp rsp;
520         struct hci_dev *hdev;
521         struct hci_conn *hcon;
522 
523         if (le16_to_cpu(hdr->len) < sizeof(*req))
524                 return -EINVAL;
525 
526         BT_DBG("local_id %d remote_id %d", req->local_id, req->remote_id);
527 
528         rsp.local_id = req->remote_id;
529         rsp.remote_id = req->local_id;
530         rsp.status = A2MP_STATUS_SUCCESS;
531 
532         hdev = hci_dev_get(req->remote_id);
533         if (!hdev) {
534                 rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
535                 goto send_rsp;
536         }
537 
538         hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, mgr->l2cap_conn->dst);
539         if (!hcon) {
540                 BT_ERR("No phys link exist");
541                 rsp.status = A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS;
542                 goto clean;
543         }
544 
545         /* TODO Disconnect Phys Link here */
546 
547 clean:
548         hci_dev_put(hdev);
549 
550 send_rsp:
551         a2mp_send(mgr, A2MP_DISCONNPHYSLINK_RSP, hdr->ident, sizeof(rsp), &rsp);
552 
553         skb_pull(skb, sizeof(*req));
554         return 0;
555 }
556 
557 static inline int a2mp_cmd_rsp(struct amp_mgr *mgr, struct sk_buff *skb,
558                                struct a2mp_cmd *hdr)
559 {
560         BT_DBG("ident %d code 0x%2.2x", hdr->ident, hdr->code);
561 
562         skb_pull(skb, le16_to_cpu(hdr->len));
563         return 0;
564 }
565 
566 /* Handle A2MP signalling */
567 static int a2mp_chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
568 {
569         struct a2mp_cmd *hdr;
570         struct amp_mgr *mgr = chan->data;
571         int err = 0;
572 
573         amp_mgr_get(mgr);
574 
575         while (skb->len >= sizeof(*hdr)) {
576                 u16 len;
577 
578                 hdr = (void *) skb->data;
579                 len = le16_to_cpu(hdr->len);
580 
581                 BT_DBG("code 0x%2.2x id %d len %u", hdr->code, hdr->ident, len);
582 
583                 skb_pull(skb, sizeof(*hdr));
584 
585                 if (len > skb->len || !hdr->ident) {
586                         err = -EINVAL;
587                         break;
588                 }
589 
590                 mgr->ident = hdr->ident;
591 
592                 switch (hdr->code) {
593                 case A2MP_COMMAND_REJ:
594                         a2mp_command_rej(mgr, skb, hdr);
595                         break;
596 
597                 case A2MP_DISCOVER_REQ:
598                         err = a2mp_discover_req(mgr, skb, hdr);
599                         break;
600 
601                 case A2MP_CHANGE_NOTIFY:
602                         err = a2mp_change_notify(mgr, skb, hdr);
603                         break;
604 
605                 case A2MP_GETINFO_REQ:
606                         err = a2mp_getinfo_req(mgr, skb, hdr);
607                         break;
608 
609                 case A2MP_GETAMPASSOC_REQ:
610                         err = a2mp_getampassoc_req(mgr, skb, hdr);
611                         break;
612 
613                 case A2MP_CREATEPHYSLINK_REQ:
614                         err = a2mp_createphyslink_req(mgr, skb, hdr);
615                         break;
616 
617                 case A2MP_DISCONNPHYSLINK_REQ:
618                         err = a2mp_discphyslink_req(mgr, skb, hdr);
619                         break;
620 
621                 case A2MP_DISCOVER_RSP:
622                         err = a2mp_discover_rsp(mgr, skb, hdr);
623                         break;
624 
625                 case A2MP_GETINFO_RSP:
626                         err = a2mp_getinfo_rsp(mgr, skb, hdr);
627                         break;
628 
629                 case A2MP_GETAMPASSOC_RSP:
630                         err = a2mp_getampassoc_rsp(mgr, skb, hdr);
631                         break;
632 
633                 case A2MP_CHANGE_RSP:
634                 case A2MP_CREATEPHYSLINK_RSP:
635                 case A2MP_DISCONNPHYSLINK_RSP:
636                         err = a2mp_cmd_rsp(mgr, skb, hdr);
637                         break;
638 
639                 default:
640                         BT_ERR("Unknown A2MP sig cmd 0x%2.2x", hdr->code);
641                         err = -EINVAL;
642                         break;
643                 }
644         }
645 
646         if (err) {
647                 struct a2mp_cmd_rej rej;
648 
649                 rej.reason = __constant_cpu_to_le16(0);
650                 hdr = (void *) skb->data;
651 
652                 BT_DBG("Send A2MP Rej: cmd 0x%2.2x err %d", hdr->code, err);
653 
654                 a2mp_send(mgr, A2MP_COMMAND_REJ, hdr->ident, sizeof(rej),
655                           &rej);
656         }
657 
658         /* Always free skb and return success error code to prevent
659            from sending L2CAP Disconnect over A2MP channel */
660         kfree_skb(skb);
661 
662         amp_mgr_put(mgr);
663 
664         return 0;
665 }
666 
667 static void a2mp_chan_close_cb(struct l2cap_chan *chan)
668 {
669         l2cap_chan_put(chan);
670 }
671 
672 static void a2mp_chan_state_change_cb(struct l2cap_chan *chan, int state)
673 {
674         struct amp_mgr *mgr = chan->data;
675 
676         if (!mgr)
677                 return;
678 
679         BT_DBG("chan %p state %s", chan, state_to_string(state));
680 
681         chan->state = state;
682 
683         switch (state) {
684         case BT_CLOSED:
685                 if (mgr)
686                         amp_mgr_put(mgr);
687                 break;
688         }
689 }
690 
691 static struct sk_buff *a2mp_chan_alloc_skb_cb(struct l2cap_chan *chan,
692                                               unsigned long len, int nb)
693 {
694         return bt_skb_alloc(len, GFP_KERNEL);
695 }
696 
697 static struct l2cap_ops a2mp_chan_ops = {
698         .name = "L2CAP A2MP channel",
699         .recv = a2mp_chan_recv_cb,
700         .close = a2mp_chan_close_cb,
701         .state_change = a2mp_chan_state_change_cb,
702         .alloc_skb = a2mp_chan_alloc_skb_cb,
703 
704         /* Not implemented for A2MP */
705         .new_connection = l2cap_chan_no_new_connection,
706         .teardown = l2cap_chan_no_teardown,
707         .ready = l2cap_chan_no_ready,
708         .defer = l2cap_chan_no_defer,
709 };
710 
711 static struct l2cap_chan *a2mp_chan_open(struct l2cap_conn *conn, bool locked)
712 {
713         struct l2cap_chan *chan;
714         int err;
715 
716         chan = l2cap_chan_create();
717         if (!chan)
718                 return NULL;
719 
720         BT_DBG("chan %p", chan);
721 
722         chan->chan_type = L2CAP_CHAN_CONN_FIX_A2MP;
723         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
724 
725         chan->ops = &a2mp_chan_ops;
726 
727         l2cap_chan_set_defaults(chan);
728         chan->remote_max_tx = chan->max_tx;
729         chan->remote_tx_win = chan->tx_win;
730 
731         chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
732         chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
733 
734         skb_queue_head_init(&chan->tx_q);
735 
736         chan->mode = L2CAP_MODE_ERTM;
737 
738         err = l2cap_ertm_init(chan);
739         if (err < 0) {
740                 l2cap_chan_del(chan, 0);
741                 return NULL;
742         }
743 
744         chan->conf_state = 0;
745 
746         if (locked)
747                 __l2cap_chan_add(conn, chan);
748         else
749                 l2cap_chan_add(conn, chan);
750 
751         chan->remote_mps = chan->omtu;
752         chan->mps = chan->omtu;
753 
754         chan->state = BT_CONNECTED;
755 
756         return chan;
757 }
758 
759 /* AMP Manager functions */
760 struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr)
761 {
762         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
763 
764         kref_get(&mgr->kref);
765 
766         return mgr;
767 }
768 
769 static void amp_mgr_destroy(struct kref *kref)
770 {
771         struct amp_mgr *mgr = container_of(kref, struct amp_mgr, kref);
772 
773         BT_DBG("mgr %p", mgr);
774 
775         mutex_lock(&amp_mgr_list_lock);
776         list_del(&mgr->list);
777         mutex_unlock(&amp_mgr_list_lock);
778 
779         amp_ctrl_list_flush(mgr);
780         kfree(mgr);
781 }
782 
783 int amp_mgr_put(struct amp_mgr *mgr)
784 {
785         BT_DBG("mgr %p orig refcnt %d", mgr, atomic_read(&mgr->kref.refcount));
786 
787         return kref_put(&mgr->kref, &amp_mgr_destroy);
788 }
789 
790 static struct amp_mgr *amp_mgr_create(struct l2cap_conn *conn, bool locked)
791 {
792         struct amp_mgr *mgr;
793         struct l2cap_chan *chan;
794 
795         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
796         if (!mgr)
797                 return NULL;
798 
799         BT_DBG("conn %p mgr %p", conn, mgr);
800 
801         mgr->l2cap_conn = conn;
802 
803         chan = a2mp_chan_open(conn, locked);
804         if (!chan) {
805                 kfree(mgr);
806                 return NULL;
807         }
808 
809         mgr->a2mp_chan = chan;
810         chan->data = mgr;
811 
812         conn->hcon->amp_mgr = mgr;
813 
814         kref_init(&mgr->kref);
815 
816         /* Remote AMP ctrl list initialization */
817         INIT_LIST_HEAD(&mgr->amp_ctrls);
818         mutex_init(&mgr->amp_ctrls_lock);
819 
820         mutex_lock(&amp_mgr_list_lock);
821         list_add(&mgr->list, &amp_mgr_list);
822         mutex_unlock(&amp_mgr_list_lock);
823 
824         return mgr;
825 }
826 
827 struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
828                                        struct sk_buff *skb)
829 {
830         struct amp_mgr *mgr;
831 
832         mgr = amp_mgr_create(conn, false);
833         if (!mgr) {
834                 BT_ERR("Could not create AMP manager");
835                 return NULL;
836         }
837 
838         BT_DBG("mgr: %p chan %p", mgr, mgr->a2mp_chan);
839 
840         return mgr->a2mp_chan;
841 }
842 
843 struct amp_mgr *amp_mgr_lookup_by_state(u8 state)
844 {
845         struct amp_mgr *mgr;
846 
847         mutex_lock(&amp_mgr_list_lock);
848         list_for_each_entry(mgr, &amp_mgr_list, list) {
849                 if (test_and_clear_bit(state, &mgr->state)) {
850                         amp_mgr_get(mgr);
851                         mutex_unlock(&amp_mgr_list_lock);
852                         return mgr;
853                 }
854         }
855         mutex_unlock(&amp_mgr_list_lock);
856 
857         return NULL;
858 }
859 
860 void a2mp_send_getinfo_rsp(struct hci_dev *hdev)
861 {
862         struct amp_mgr *mgr;
863         struct a2mp_info_rsp rsp;
864 
865         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_INFO);
866         if (!mgr)
867                 return;
868 
869         BT_DBG("%s mgr %p", hdev->name, mgr);
870 
871         rsp.id = hdev->id;
872         rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
873 
874         if (hdev->amp_type != HCI_BREDR) {
875                 rsp.status = 0;
876                 rsp.total_bw = cpu_to_le32(hdev->amp_total_bw);
877                 rsp.max_bw = cpu_to_le32(hdev->amp_max_bw);
878                 rsp.min_latency = cpu_to_le32(hdev->amp_min_latency);
879                 rsp.pal_cap = cpu_to_le16(hdev->amp_pal_cap);
880                 rsp.assoc_size = cpu_to_le16(hdev->amp_assoc_size);
881         }
882 
883         a2mp_send(mgr, A2MP_GETINFO_RSP, mgr->ident, sizeof(rsp), &rsp);
884         amp_mgr_put(mgr);
885 }
886 
887 void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status)
888 {
889         struct amp_mgr *mgr;
890         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
891         struct a2mp_amp_assoc_rsp *rsp;
892         size_t len;
893 
894         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC);
895         if (!mgr)
896                 return;
897 
898         BT_DBG("%s mgr %p", hdev->name, mgr);
899 
900         len = sizeof(struct a2mp_amp_assoc_rsp) + loc_assoc->len;
901         rsp = kzalloc(len, GFP_KERNEL);
902         if (!rsp) {
903                 amp_mgr_put(mgr);
904                 return;
905         }
906 
907         rsp->id = hdev->id;
908 
909         if (status) {
910                 rsp->status = A2MP_STATUS_INVALID_CTRL_ID;
911         } else {
912                 rsp->status = A2MP_STATUS_SUCCESS;
913                 memcpy(rsp->amp_assoc, loc_assoc->data, loc_assoc->len);
914         }
915 
916         a2mp_send(mgr, A2MP_GETAMPASSOC_RSP, mgr->ident, len, rsp);
917         amp_mgr_put(mgr);
918         kfree(rsp);
919 }
920 
921 void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status)
922 {
923         struct amp_mgr *mgr;
924         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
925         struct a2mp_physlink_req *req;
926         struct l2cap_chan *bredr_chan;
927         size_t len;
928 
929         mgr = amp_mgr_lookup_by_state(READ_LOC_AMP_ASSOC_FINAL);
930         if (!mgr)
931                 return;
932 
933         len = sizeof(*req) + loc_assoc->len;
934 
935         BT_DBG("%s mgr %p assoc_len %zu", hdev->name, mgr, len);
936 
937         req = kzalloc(len, GFP_KERNEL);
938         if (!req) {
939                 amp_mgr_put(mgr);
940                 return;
941         }
942 
943         bredr_chan = mgr->bredr_chan;
944         if (!bredr_chan)
945                 goto clean;
946 
947         req->local_id = hdev->id;
948         req->remote_id = bredr_chan->remote_amp_id;
949         memcpy(req->amp_assoc, loc_assoc->data, loc_assoc->len);
950 
951         a2mp_send(mgr, A2MP_CREATEPHYSLINK_REQ, __next_ident(mgr), len, req);
952 
953 clean:
954         amp_mgr_put(mgr);
955         kfree(req);
956 }
957 
958 void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status)
959 {
960         struct amp_mgr *mgr;
961         struct a2mp_physlink_rsp rsp;
962         struct hci_conn *hs_hcon;
963 
964         mgr = amp_mgr_lookup_by_state(WRITE_REMOTE_AMP_ASSOC);
965         if (!mgr)
966                 return;
967 
968         hs_hcon = hci_conn_hash_lookup_state(hdev, AMP_LINK, BT_CONNECT);
969         if (!hs_hcon) {
970                 rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
971         } else {
972                 rsp.remote_id = hs_hcon->remote_id;
973                 rsp.status = A2MP_STATUS_SUCCESS;
974         }
975 
976         BT_DBG("%s mgr %p hs_hcon %p status %u", hdev->name, mgr, hs_hcon,
977                status);
978 
979         rsp.local_id = hdev->id;
980         a2mp_send(mgr, A2MP_CREATEPHYSLINK_RSP, mgr->ident, sizeof(rsp), &rsp);
981         amp_mgr_put(mgr);
982 }
983 
984 void a2mp_discover_amp(struct l2cap_chan *chan)
985 {
986         struct l2cap_conn *conn = chan->conn;
987         struct amp_mgr *mgr = conn->hcon->amp_mgr;
988         struct a2mp_discov_req req;
989 
990         BT_DBG("chan %p conn %p mgr %p", chan, conn, mgr);
991 
992         if (!mgr) {
993                 mgr = amp_mgr_create(conn, true);
994                 if (!mgr)
995                         return;
996         }
997 
998         mgr->bredr_chan = chan;
999 
1000         req.mtu = cpu_to_le16(L2CAP_A2MP_DEFAULT_MTU);
1001         req.ext_feat = 0;
1002         a2mp_send(mgr, A2MP_DISCOVER_REQ, 1, sizeof(req), &req);
1003 }
1004 

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