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

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