2 Copyright (c) 2011,2012 Intel Corp.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License version 2 and
6 only version 2 as published by the Free Software Foundation.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
14 #include <net/bluetooth/bluetooth.h>
15 #include <net/bluetooth/hci.h>
16 #include <net/bluetooth/hci_core.h>
17 #include <crypto/hash.h>
19 #include "hci_request.h"
23 /* Remote AMP Controllers interface */
24 void amp_ctrl_get(struct amp_ctrl *ctrl)
26 BT_DBG("ctrl %p orig refcnt %d", ctrl,
27 kref_read(&ctrl->kref));
29 kref_get(&ctrl->kref);
32 static void amp_ctrl_destroy(struct kref *kref)
34 struct amp_ctrl *ctrl = container_of(kref, struct amp_ctrl, kref);
36 BT_DBG("ctrl %p", ctrl);
42 int amp_ctrl_put(struct amp_ctrl *ctrl)
44 BT_DBG("ctrl %p orig refcnt %d", ctrl,
45 kref_read(&ctrl->kref));
47 return kref_put(&ctrl->kref, &_ctrl_destroy);
50 struct amp_ctrl *amp_ctrl_add(struct amp_mgr *mgr, u8 id)
52 struct amp_ctrl *ctrl;
54 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
58 kref_init(&ctrl->kref);
61 mutex_lock(&mgr->amp_ctrls_lock);
62 list_add(&ctrl->list, &mgr->amp_ctrls);
63 mutex_unlock(&mgr->amp_ctrls_lock);
65 BT_DBG("mgr %p ctrl %p", mgr, ctrl);
70 void amp_ctrl_list_flush(struct amp_mgr *mgr)
72 struct amp_ctrl *ctrl, *n;
74 BT_DBG("mgr %p", mgr);
76 mutex_lock(&mgr->amp_ctrls_lock);
77 list_for_each_entry_safe(ctrl, n, &mgr->amp_ctrls, list) {
78 list_del(&ctrl->list);
81 mutex_unlock(&mgr->amp_ctrls_lock);
84 struct amp_ctrl *amp_ctrl_lookup(struct amp_mgr *mgr, u8 id)
86 struct amp_ctrl *ctrl;
88 BT_DBG("mgr %p id %d", mgr, id);
90 mutex_lock(&mgr->amp_ctrls_lock);
91 list_for_each_entry(ctrl, &mgr->amp_ctrls, list) {
94 mutex_unlock(&mgr->amp_ctrls_lock);
98 mutex_unlock(&mgr->amp_ctrls_lock);
103 /* Physical Link interface */
104 static u8 __next_handle(struct amp_mgr *mgr)
106 if (++mgr->handle == 0)
112 struct hci_conn *phylink_add(struct hci_dev *hdev, struct amp_mgr *mgr,
113 u8 remote_id, bool out)
115 bdaddr_t *dst = &mgr->l2cap_conn->hcon->dst;
116 struct hci_conn *hcon;
117 u8 role = out ? HCI_ROLE_MASTER : HCI_ROLE_SLAVE;
119 hcon = hci_conn_add(hdev, AMP_LINK, dst, role);
123 BT_DBG("hcon %p dst %pMR", hcon, dst);
125 hcon->state = BT_CONNECT;
127 hcon->handle = __next_handle(mgr);
128 hcon->remote_id = remote_id;
129 hcon->amp_mgr = amp_mgr_get(mgr);
134 /* AMP crypto key generation interface */
135 static int hmac_sha256(u8 *key, u8 ksize, char *plaintext, u8 psize, u8 *output)
137 struct crypto_shash *tfm;
138 struct shash_desc *shash;
144 tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
146 BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
150 ret = crypto_shash_setkey(tfm, key, ksize);
152 BT_DBG("crypto_ahash_setkey failed: err %d", ret);
156 shash = kzalloc(sizeof(*shash) + crypto_shash_descsize(tfm),
165 ret = crypto_shash_digest(shash, plaintext, psize, output);
170 crypto_free_shash(tfm);
174 int phylink_gen_key(struct hci_conn *conn, u8 *data, u8 *len, u8 *type)
176 struct hci_dev *hdev = conn->hdev;
177 struct link_key *key;
178 u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
179 u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
182 if (!hci_conn_check_link_mode(conn))
185 BT_DBG("conn %p key_type %d", conn, conn->key_type);
188 if (conn->key_type < 3) {
189 bt_dev_err(hdev, "legacy key type %d", conn->key_type);
193 *type = conn->key_type;
194 *len = HCI_AMP_LINK_KEY_SIZE;
196 key = hci_find_link_key(hdev, &conn->dst);
198 BT_DBG("No Link key for conn %p dst %pMR", conn, &conn->dst);
202 /* BR/EDR Link Key concatenated together with itself */
203 memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
204 memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);
206 /* Derive Generic AMP Link Key (gamp) */
207 err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
209 bt_dev_err(hdev, "could not derive Generic AMP Key: err %d", err);
213 if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
214 BT_DBG("Use Generic AMP Key (gamp)");
215 memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
219 /* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
220 return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
223 static void read_local_amp_assoc_complete(struct hci_dev *hdev, u8 status,
224 u16 opcode, struct sk_buff *skb)
226 struct hci_rp_read_local_amp_assoc *rp = (void *)skb->data;
227 struct amp_assoc *assoc = &hdev->loc_assoc;
228 size_t rem_len, frag_len;
230 BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
235 frag_len = skb->len - sizeof(*rp);
236 rem_len = __le16_to_cpu(rp->rem_len);
238 if (rem_len > frag_len) {
239 BT_DBG("frag_len %zu rem_len %zu", frag_len, rem_len);
241 memcpy(assoc->data + assoc->offset, rp->frag, frag_len);
242 assoc->offset += frag_len;
244 /* Read other fragments */
245 amp_read_loc_assoc_frag(hdev, rp->phy_handle);
250 memcpy(assoc->data + assoc->offset, rp->frag, rem_len);
251 assoc->len = assoc->offset + rem_len;
255 /* Send A2MP Rsp when all fragments are received */
256 a2mp_send_getampassoc_rsp(hdev, rp->status);
257 a2mp_send_create_phy_link_req(hdev, rp->status);
260 void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
262 struct hci_cp_read_local_amp_assoc cp;
263 struct amp_assoc *loc_assoc = &hdev->loc_assoc;
264 struct hci_request req;
267 BT_DBG("%s handle %d", hdev->name, phy_handle);
269 cp.phy_handle = phy_handle;
270 cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
271 cp.len_so_far = cpu_to_le16(loc_assoc->offset);
273 hci_req_init(&req, hdev);
274 hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
275 err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
277 a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
280 void amp_read_loc_assoc(struct hci_dev *hdev, struct amp_mgr *mgr)
282 struct hci_cp_read_local_amp_assoc cp;
283 struct hci_request req;
286 memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
287 memset(&cp, 0, sizeof(cp));
289 cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
291 set_bit(READ_LOC_AMP_ASSOC, &mgr->state);
292 hci_req_init(&req, hdev);
293 hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
294 err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
296 a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
299 void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
300 struct hci_conn *hcon)
302 struct hci_cp_read_local_amp_assoc cp;
303 struct amp_mgr *mgr = hcon->amp_mgr;
304 struct hci_request req;
307 cp.phy_handle = hcon->handle;
308 cp.len_so_far = cpu_to_le16(0);
309 cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
311 set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state);
313 /* Read Local AMP Assoc final link information data */
314 hci_req_init(&req, hdev);
315 hci_req_add(&req, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
316 err = hci_req_run_skb(&req, read_local_amp_assoc_complete);
318 a2mp_send_getampassoc_rsp(hdev, A2MP_STATUS_INVALID_CTRL_ID);
321 static void write_remote_amp_assoc_complete(struct hci_dev *hdev, u8 status,
322 u16 opcode, struct sk_buff *skb)
324 struct hci_rp_write_remote_amp_assoc *rp = (void *)skb->data;
326 BT_DBG("%s status 0x%2.2x phy_handle 0x%2.2x",
327 hdev->name, rp->status, rp->phy_handle);
332 amp_write_rem_assoc_continue(hdev, rp->phy_handle);
335 /* Write AMP Assoc data fragments, returns true with last fragment written*/
336 static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
337 struct hci_conn *hcon)
339 struct hci_cp_write_remote_amp_assoc *cp;
340 struct amp_mgr *mgr = hcon->amp_mgr;
341 struct amp_ctrl *ctrl;
342 struct hci_request req;
345 ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
349 if (!ctrl->assoc_rem_len) {
350 BT_DBG("all fragments are written");
351 ctrl->assoc_rem_len = ctrl->assoc_len;
352 ctrl->assoc_len_so_far = 0;
358 frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
359 len = frag_len + sizeof(*cp);
361 cp = kzalloc(len, GFP_KERNEL);
367 BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
368 hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
370 cp->phy_handle = hcon->handle;
371 cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
372 cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
373 memcpy(cp->frag, ctrl->assoc, frag_len);
375 ctrl->assoc_len_so_far += frag_len;
376 ctrl->assoc_rem_len -= frag_len;
380 hci_req_init(&req, hdev);
381 hci_req_add(&req, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
382 hci_req_run_skb(&req, write_remote_amp_assoc_complete);
389 void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
391 struct hci_conn *hcon;
393 BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
395 hcon = hci_conn_hash_lookup_handle(hdev, handle);
399 /* Send A2MP create phylink rsp when all fragments are written */
400 if (amp_write_rem_assoc_frag(hdev, hcon))
401 a2mp_send_create_phy_link_rsp(hdev, 0);
404 void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
406 struct hci_conn *hcon;
408 BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
410 hcon = hci_conn_hash_lookup_handle(hdev, handle);
414 BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
416 amp_write_rem_assoc_frag(hdev, hcon);
419 static void create_phylink_complete(struct hci_dev *hdev, u8 status,
422 struct hci_cp_create_phy_link *cp;
424 BT_DBG("%s status 0x%2.2x", hdev->name, status);
426 cp = hci_sent_cmd_data(hdev, HCI_OP_CREATE_PHY_LINK);
433 struct hci_conn *hcon;
435 hcon = hci_conn_hash_lookup_handle(hdev, cp->phy_handle);
439 amp_write_remote_assoc(hdev, cp->phy_handle);
442 hci_dev_unlock(hdev);
445 void amp_create_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
446 struct hci_conn *hcon)
448 struct hci_cp_create_phy_link cp;
449 struct hci_request req;
451 cp.phy_handle = hcon->handle;
453 BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
456 if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
458 BT_DBG("Cannot create link key");
462 hci_req_init(&req, hdev);
463 hci_req_add(&req, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
464 hci_req_run(&req, create_phylink_complete);
467 static void accept_phylink_complete(struct hci_dev *hdev, u8 status,
470 struct hci_cp_accept_phy_link *cp;
472 BT_DBG("%s status 0x%2.2x", hdev->name, status);
477 cp = hci_sent_cmd_data(hdev, HCI_OP_ACCEPT_PHY_LINK);
481 amp_write_remote_assoc(hdev, cp->phy_handle);
484 void amp_accept_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
485 struct hci_conn *hcon)
487 struct hci_cp_accept_phy_link cp;
488 struct hci_request req;
490 cp.phy_handle = hcon->handle;
492 BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
495 if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
497 BT_DBG("Cannot create link key");
501 hci_req_init(&req, hdev);
502 hci_req_add(&req, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
503 hci_req_run(&req, accept_phylink_complete);
506 void amp_physical_cfm(struct hci_conn *bredr_hcon, struct hci_conn *hs_hcon)
508 struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev);
509 struct amp_mgr *mgr = hs_hcon->amp_mgr;
510 struct l2cap_chan *bredr_chan;
512 BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr);
514 if (!bredr_hdev || !mgr || !mgr->bredr_chan)
517 bredr_chan = mgr->bredr_chan;
519 l2cap_chan_lock(bredr_chan);
521 set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags);
522 bredr_chan->remote_amp_id = hs_hcon->remote_id;
523 bredr_chan->local_amp_id = hs_hcon->hdev->id;
524 bredr_chan->hs_hcon = hs_hcon;
525 bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu;
527 __l2cap_physical_cfm(bredr_chan, 0);
529 l2cap_chan_unlock(bredr_chan);
531 hci_dev_put(bredr_hdev);
534 void amp_create_logical_link(struct l2cap_chan *chan)
536 struct hci_conn *hs_hcon = chan->hs_hcon;
537 struct hci_cp_create_accept_logical_link cp;
538 struct hci_dev *hdev;
540 BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon,
541 &chan->conn->hcon->dst);
546 hdev = hci_dev_hold(chan->hs_hcon->hdev);
550 cp.phy_handle = hs_hcon->handle;
552 cp.tx_flow_spec.id = chan->local_id;
553 cp.tx_flow_spec.stype = chan->local_stype;
554 cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu);
555 cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
556 cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat);
557 cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to);
559 cp.rx_flow_spec.id = chan->remote_id;
560 cp.rx_flow_spec.stype = chan->remote_stype;
561 cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu);
562 cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime);
563 cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat);
564 cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to);
567 hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp),
570 hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp),
576 void amp_disconnect_logical_link(struct hci_chan *hchan)
578 struct hci_conn *hcon = hchan->conn;
579 struct hci_cp_disconn_logical_link cp;
581 if (hcon->state != BT_CONNECTED) {
582 BT_DBG("hchan %p not connected", hchan);
586 cp.log_handle = cpu_to_le16(hchan->handle);
587 hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp);
590 void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason)
592 BT_DBG("hchan %p", hchan);