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7#include <net/bluetooth/bluetooth.h>
8#include <net/bluetooth/hci.h>
9#include <net/bluetooth/hci_core.h>
10#include <crypto/hash.h>
11
12#include "hci_request.h"
13#include "a2mp.h"
14#include "amp.h"
15
16
17void amp_ctrl_get(struct amp_ctrl *ctrl)
18{
19 BT_DBG("ctrl %p orig refcnt %d", ctrl,
20 kref_read(&ctrl->kref));
21
22 kref_get(&ctrl->kref);
23}
24
25static void amp_ctrl_destroy(struct kref *kref)
26{
27 struct amp_ctrl *ctrl = container_of(kref, struct amp_ctrl, kref);
28
29 BT_DBG("ctrl %p", ctrl);
30
31 kfree(ctrl->assoc);
32 kfree(ctrl);
33}
34
35int amp_ctrl_put(struct amp_ctrl *ctrl)
36{
37 BT_DBG("ctrl %p orig refcnt %d", ctrl,
38 kref_read(&ctrl->kref));
39
40 return kref_put(&ctrl->kref, &_ctrl_destroy);
41}
42
43struct amp_ctrl *amp_ctrl_add(struct amp_mgr *mgr, u8 id)
44{
45 struct amp_ctrl *ctrl;
46
47 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
48 if (!ctrl)
49 return NULL;
50
51 kref_init(&ctrl->kref);
52 ctrl->id = id;
53
54 mutex_lock(&mgr->amp_ctrls_lock);
55 list_add(&ctrl->list, &mgr->amp_ctrls);
56 mutex_unlock(&mgr->amp_ctrls_lock);
57
58 BT_DBG("mgr %p ctrl %p", mgr, ctrl);
59
60 return ctrl;
61}
62
63void amp_ctrl_list_flush(struct amp_mgr *mgr)
64{
65 struct amp_ctrl *ctrl, *n;
66
67 BT_DBG("mgr %p", mgr);
68
69 mutex_lock(&mgr->amp_ctrls_lock);
70 list_for_each_entry_safe(ctrl, n, &mgr->amp_ctrls, list) {
71 list_del(&ctrl->list);
72 amp_ctrl_put(ctrl);
73 }
74 mutex_unlock(&mgr->amp_ctrls_lock);
75}
76
77struct amp_ctrl *amp_ctrl_lookup(struct amp_mgr *mgr, u8 id)
78{
79 struct amp_ctrl *ctrl;
80
81 BT_DBG("mgr %p id %d", mgr, id);
82
83 mutex_lock(&mgr->amp_ctrls_lock);
84 list_for_each_entry(ctrl, &mgr->amp_ctrls, list) {
85 if (ctrl->id == id) {
86 amp_ctrl_get(ctrl);
87 mutex_unlock(&mgr->amp_ctrls_lock);
88 return ctrl;
89 }
90 }
91 mutex_unlock(&mgr->amp_ctrls_lock);
92
93 return NULL;
94}
95
96
97static u8 __next_handle(struct amp_mgr *mgr)
98{
99 if (++mgr->handle == 0)
100 mgr->handle = 1;
101
102 return mgr->handle;
103}
104
105struct hci_conn *phylink_add(struct hci_dev *hdev, struct amp_mgr *mgr,
106 u8 remote_id, bool out)
107{
108 bdaddr_t *dst = &mgr->l2cap_conn->hcon->dst;
109 struct hci_conn *hcon;
110 u8 role = out ? HCI_ROLE_MASTER : HCI_ROLE_SLAVE;
111
112 hcon = hci_conn_add(hdev, AMP_LINK, dst, role);
113 if (!hcon)
114 return NULL;
115
116 BT_DBG("hcon %p dst %pMR", hcon, dst);
117
118 hcon->state = BT_CONNECT;
119 hcon->attempt++;
120 hcon->handle = __next_handle(mgr);
121 hcon->remote_id = remote_id;
122 hcon->amp_mgr = amp_mgr_get(mgr);
123
124 return hcon;
125}
126
127
128static int hmac_sha256(u8 *key, u8 ksize, char *plaintext, u8 psize, u8 *output)
129{
130 struct crypto_shash *tfm;
131 struct shash_desc *shash;
132 int ret;
133
134 if (!ksize)
135 return -EINVAL;
136
137 tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
138 if (IS_ERR(tfm)) {
139 BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
140 return PTR_ERR(tfm);
141 }
142
143 ret = crypto_shash_setkey(tfm, key, ksize);
144 if (ret) {
145 BT_DBG("crypto_ahash_setkey failed: err %d", ret);
146 goto failed;
147 }
148
149 shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm),
150 GFP_KERNEL);
151 if (!shash) {
152 ret = -ENOMEM;
153 goto failed;
154 }
155
156 shash->tfm = tfm;
157
158 ret = crypto_shash_digest(shash, plaintext, psize, output);
159
160 kfree(shash);
161
162failed:
163 crypto_free_shash(tfm);
164 return ret;
165}
166
167int phylink_gen_key(struct hci_conn *conn, u8 *data, u8 *len, u8 *type)
168{
169 struct hci_dev *hdev = conn->hdev;
170 struct link_key *key;
171 u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
172 u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
173 int err;
174
175 if (!hci_conn_check_link_mode(conn))
176 return -EACCES;
177
178 BT_DBG("conn %p key_type %d", conn, conn->key_type);
179
180
181 if (conn->key_type < 3) {
182 bt_dev_err(hdev, "legacy key type %d", conn->key_type);
183 return -EACCES;
184 }
185
186 *type = conn->key_type;
187 *len = HCI_AMP_LINK_KEY_SIZE;
188
189 key = hci_find_link_key(hdev, &conn->dst);
190 if (!key) {
191 BT_DBG("No Link key for conn %p dst %pMR", conn, &conn->dst);
192 return -EACCES;
193 }
194
195
196 memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
197 memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);
198
199
200 err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
201 if (err) {
202 bt_dev_err(hdev, "could not derive Generic AMP Key: err %d", err);
203 return err;
204 }
205
206 if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
207 BT_DBG("Use Generic AMP Key (gamp)");
208 memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
209 return err;
210 }
211
212
213 return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
214}
215
216static void read_local_amp_assoc_complete(struct hci_dev *hdev, u8 status,
217 u16 opcode, struct sk_buff *skb)
218{
219 struct hci_rp_read_local_amp_assoc *rp = (void *)skb->data;
220 struct amp_assoc *assoc = &hdev->loc_assoc;
221 size_t rem_len, frag_len;
222
223 BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
224
225 if (rp->status)
226 goto send_rsp;
227
228 frag_len = skb->len - sizeof(*rp);
229 rem_len = __le16_to_cpu(rp->rem_len);
230
231 if (rem_len > frag_len) {
232 BT_DBG("frag_len %zu rem_len %zu", frag_len, rem_len);
233
234 memcpy(assoc->data + assoc->offset, rp->frag, frag_len);
235 assoc->offset += frag_len;
236
237
238 amp_read_loc_assoc_frag(hdev, rp->phy_handle);
239
240 return;
241 }
242
243 memcpy(assoc->data + assoc->offset, rp->frag, rem_len);
244 assoc->len = assoc->offset + rem_len;
245 assoc->offset = 0;
246
247send_rsp:
248
249 a2mp_send_getampassoc_rsp(hdev, rp->status);
250 a2mp_send_create_phy_link_req(hdev, rp->status);
251}
252
253void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
254{
255 struct hci_cp_read_local_amp_assoc cp;
256 struct amp_assoc *loc_assoc = &hdev->loc_assoc;
257 struct hci_request req;
258 int err;
259
260 BT_DBG("%s handle %d", hdev->name, phy_handle);
261
262 cp.phy_handle = phy_handle;
263 cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
264 cp.len_so_far = cpu_to_le16(loc_assoc->offset);
265
266 hci_req_init(&req, hdev);
267 hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
268 err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
269 if (err < 0)
270 a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
271}
272
273void amp_read_loc_assoc(struct hci_dev *hdev, struct amp_mgr *mgr)
274{
275 struct hci_cp_read_local_amp_assoc cp;
276 struct hci_request req;
277 int err;
278
279 memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
280 memset(&cp, 0, sizeof(cp));
281
282 cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
283
284 set_bit(READ_LOC_AMP_ASSOC, &mgr->state);
285 hci_req_init(&req, hdev);
286 hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
287 err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
288 if (err < 0)
289 a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
290}
291
292void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
293 struct hci_conn *hcon)
294{
295 struct hci_cp_read_local_amp_assoc cp;
296 struct amp_mgr *mgr = hcon->amp_mgr;
297 struct hci_request req;
298 int err;
299
300 cp.phy_handle = hcon->handle;
301 cp.len_so_far = cpu_to_le16(0);
302 cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
303
304 set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state);
305
306
307 hci_req_init(&req, hdev);
308 hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
309 err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
310 if (err < 0)
311 a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
312}
313
314static void write_remote_amp_assoc_complete(struct hci_dev *hdev, u8 status,
315 u16 opcode, struct sk_buff *skb)
316{
317 struct hci_rp_write_remote_amp_assoc *rp = (void *)skb->data;
318
319 BT_DBG("%s status 0x%2.2x phy_handle 0x%2.2x",
320 hdev->name, rp->status, rp->phy_handle);
321
322 if (rp->status)
323 return;
324
325 amp_write_rem_assoc_continue(hdev, rp->phy_handle);
326}
327
328
329static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
330 struct hci_conn *hcon)
331{
332 struct hci_cp_write_remote_amp_assoc *cp;
333 struct amp_mgr *mgr = hcon->amp_mgr;
334 struct amp_ctrl *ctrl;
335 struct hci_request req;
336 u16 frag_len, len;
337
338 ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
339 if (!ctrl)
340 return false;
341
342 if (!ctrl->assoc_rem_len) {
343 BT_DBG("all fragments are written");
344 ctrl->assoc_rem_len = ctrl->assoc_len;
345 ctrl->assoc_len_so_far = 0;
346
347 amp_ctrl_put(ctrl);
348 return true;
349 }
350
351 frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
352 len = frag_len + sizeof(*cp);
353
354 cp = kzalloc(len, GFP_KERNEL);
355 if (!cp) {
356 amp_ctrl_put(ctrl);
357 return false;
358 }
359
360 BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
361 hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
362
363 cp->phy_handle = hcon->handle;
364 cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
365 cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
366 memcpy(cp->frag, ctrl->assoc, frag_len);
367
368 ctrl->assoc_len_so_far += frag_len;
369 ctrl->assoc_rem_len -= frag_len;
370
371 amp_ctrl_put(ctrl);
372
373 hci_req_init(&req, hdev);
374 hci_req_add(&req, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
375 hci_req_run_skb(&req, write_remote_amp_assoc_complete);
376
377 kfree(cp);
378
379 return false;
380}
381
382void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
383{
384 struct hci_conn *hcon;
385
386 BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
387
388 hcon = hci_conn_hash_lookup_handle(hdev, handle);
389 if (!hcon)
390 return;
391
392
393 if (amp_write_rem_assoc_frag(hdev, hcon))
394 a2mp_send_create_phy_link_rsp(hdev, 0);
395}
396
397void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
398{
399 struct hci_conn *hcon;
400
401 BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
402
403 hcon = hci_conn_hash_lookup_handle(hdev, handle);
404 if (!hcon)
405 return;
406
407 BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
408
409 amp_write_rem_assoc_frag(hdev, hcon);
410}
411
412static void create_phylink_complete(struct hci_dev *hdev, u8 status,
413 u16 opcode)
414{
415 struct hci_cp_create_phy_link *cp;
416
417 BT_DBG("%s status 0x%2.2x", hdev->name, status);
418
419 cp = hci_sent_cmd_data(hdev, HCI_OP_CREATE_PHY_LINK);
420 if (!cp)
421 return;
422
423 hci_dev_lock(hdev);
424
425 if (status) {
426 struct hci_conn *hcon;
427
428 hcon = hci_conn_hash_lookup_handle(hdev, cp->phy_handle);
429 if (hcon)
430 hci_conn_del(hcon);
431 } else {
432 amp_write_remote_assoc(hdev, cp->phy_handle);
433 }
434
435 hci_dev_unlock(hdev);
436}
437
438void amp_create_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
439 struct hci_conn *hcon)
440{
441 struct hci_cp_create_phy_link cp;
442 struct hci_request req;
443
444 cp.phy_handle = hcon->handle;
445
446 BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
447 hcon->handle);
448
449 if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
450 &cp.key_type)) {
451 BT_DBG("Cannot create link key");
452 return;
453 }
454
455 hci_req_init(&req, hdev);
456 hci_req_add(&req, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
457 hci_req_run(&req, create_phylink_complete);
458}
459
460static void accept_phylink_complete(struct hci_dev *hdev, u8 status,
461 u16 opcode)
462{
463 struct hci_cp_accept_phy_link *cp;
464
465 BT_DBG("%s status 0x%2.2x", hdev->name, status);
466
467 if (status)
468 return;
469
470 cp = hci_sent_cmd_data(hdev, HCI_OP_ACCEPT_PHY_LINK);
471 if (!cp)
472 return;
473
474 amp_write_remote_assoc(hdev, cp->phy_handle);
475}
476
477void amp_accept_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
478 struct hci_conn *hcon)
479{
480 struct hci_cp_accept_phy_link cp;
481 struct hci_request req;
482
483 cp.phy_handle = hcon->handle;
484
485 BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
486 hcon->handle);
487
488 if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
489 &cp.key_type)) {
490 BT_DBG("Cannot create link key");
491 return;
492 }
493
494 hci_req_init(&req, hdev);
495 hci_req_add(&req, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
496 hci_req_run(&req, accept_phylink_complete);
497}
498
499void amp_physical_cfm(struct hci_conn *bredr_hcon, struct hci_conn *hs_hcon)
500{
501 struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev);
502 struct amp_mgr *mgr = hs_hcon->amp_mgr;
503 struct l2cap_chan *bredr_chan;
504
505 BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr);
506
507 if (!bredr_hdev || !mgr || !mgr->bredr_chan)
508 return;
509
510 bredr_chan = mgr->bredr_chan;
511
512 l2cap_chan_lock(bredr_chan);
513
514 set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags);
515 bredr_chan->remote_amp_id = hs_hcon->remote_id;
516 bredr_chan->local_amp_id = hs_hcon->hdev->id;
517 bredr_chan->hs_hcon = hs_hcon;
518 bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu;
519
520 __l2cap_physical_cfm(bredr_chan, 0);
521
522 l2cap_chan_unlock(bredr_chan);
523
524 hci_dev_put(bredr_hdev);
525}
526
527void amp_create_logical_link(struct l2cap_chan *chan)
528{
529 struct hci_conn *hs_hcon = chan->hs_hcon;
530 struct hci_cp_create_accept_logical_link cp;
531 struct hci_dev *hdev;
532
533 BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon,
534 &chan->conn->hcon->dst);
535
536 if (!hs_hcon)
537 return;
538
539 hdev = hci_dev_hold(chan->hs_hcon->hdev);
540 if (!hdev)
541 return;
542
543 cp.phy_handle = hs_hcon->handle;
544
545 cp.tx_flow_spec.id = chan->local_id;
546 cp.tx_flow_spec.stype = chan->local_stype;
547 cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu);
548 cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
549 cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat);
550 cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to);
551
552 cp.rx_flow_spec.id = chan->remote_id;
553 cp.rx_flow_spec.stype = chan->remote_stype;
554 cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu);
555 cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime);
556 cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat);
557 cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to);
558
559 if (hs_hcon->out)
560 hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp),
561 &cp);
562 else
563 hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp),
564 &cp);
565
566 hci_dev_put(hdev);
567}
568
569void amp_disconnect_logical_link(struct hci_chan *hchan)
570{
571 struct hci_conn *hcon = hchan->conn;
572 struct hci_cp_disconn_logical_link cp;
573
574 if (hcon->state != BT_CONNECTED) {
575 BT_DBG("hchan %p not connected", hchan);
576 return;
577 }
578
579 cp.log_handle = cpu_to_le16(hchan->handle);
580 hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp);
581}
582
583void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason)
584{
585 BT_DBG("hchan %p", hchan);
586
587 hci_chan_del(hchan);
588}
589
