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TOMOYO Linux Cross Reference
Linux/net/bluetooth/amp.c

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  1 /*
  2    Copyright (c) 2011,2012 Intel Corp.
  3 
  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.
  7 
  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.
 12 */
 13 
 14 #include <net/bluetooth/bluetooth.h>
 15 #include <net/bluetooth/hci.h>
 16 #include <net/bluetooth/hci_core.h>
 17 #include <net/bluetooth/a2mp.h>
 18 #include <net/bluetooth/amp.h>
 19 #include <crypto/hash.h>
 20 
 21 /* Remote AMP Controllers interface */
 22 void amp_ctrl_get(struct amp_ctrl *ctrl)
 23 {
 24         BT_DBG("ctrl %p orig refcnt %d", ctrl,
 25                atomic_read(&ctrl->kref.refcount));
 26 
 27         kref_get(&ctrl->kref);
 28 }
 29 
 30 static void amp_ctrl_destroy(struct kref *kref)
 31 {
 32         struct amp_ctrl *ctrl = container_of(kref, struct amp_ctrl, kref);
 33 
 34         BT_DBG("ctrl %p", ctrl);
 35 
 36         kfree(ctrl->assoc);
 37         kfree(ctrl);
 38 }
 39 
 40 int amp_ctrl_put(struct amp_ctrl *ctrl)
 41 {
 42         BT_DBG("ctrl %p orig refcnt %d", ctrl,
 43                atomic_read(&ctrl->kref.refcount));
 44 
 45         return kref_put(&ctrl->kref, &amp_ctrl_destroy);
 46 }
 47 
 48 struct amp_ctrl *amp_ctrl_add(struct amp_mgr *mgr, u8 id)
 49 {
 50         struct amp_ctrl *ctrl;
 51 
 52         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 53         if (!ctrl)
 54                 return NULL;
 55 
 56         kref_init(&ctrl->kref);
 57         ctrl->id = id;
 58 
 59         mutex_lock(&mgr->amp_ctrls_lock);
 60         list_add(&ctrl->list, &mgr->amp_ctrls);
 61         mutex_unlock(&mgr->amp_ctrls_lock);
 62 
 63         BT_DBG("mgr %p ctrl %p", mgr, ctrl);
 64 
 65         return ctrl;
 66 }
 67 
 68 void amp_ctrl_list_flush(struct amp_mgr *mgr)
 69 {
 70         struct amp_ctrl *ctrl, *n;
 71 
 72         BT_DBG("mgr %p", mgr);
 73 
 74         mutex_lock(&mgr->amp_ctrls_lock);
 75         list_for_each_entry_safe(ctrl, n, &mgr->amp_ctrls, list) {
 76                 list_del(&ctrl->list);
 77                 amp_ctrl_put(ctrl);
 78         }
 79         mutex_unlock(&mgr->amp_ctrls_lock);
 80 }
 81 
 82 struct amp_ctrl *amp_ctrl_lookup(struct amp_mgr *mgr, u8 id)
 83 {
 84         struct amp_ctrl *ctrl;
 85 
 86         BT_DBG("mgr %p id %d", mgr, id);
 87 
 88         mutex_lock(&mgr->amp_ctrls_lock);
 89         list_for_each_entry(ctrl, &mgr->amp_ctrls, list) {
 90                 if (ctrl->id == id) {
 91                         amp_ctrl_get(ctrl);
 92                         mutex_unlock(&mgr->amp_ctrls_lock);
 93                         return ctrl;
 94                 }
 95         }
 96         mutex_unlock(&mgr->amp_ctrls_lock);
 97 
 98         return NULL;
 99 }
100 
101 /* Physical Link interface */
102 static u8 __next_handle(struct amp_mgr *mgr)
103 {
104         if (++mgr->handle == 0)
105                 mgr->handle = 1;
106 
107         return mgr->handle;
108 }
109 
110 struct hci_conn *phylink_add(struct hci_dev *hdev, struct amp_mgr *mgr,
111                              u8 remote_id, bool out)
112 {
113         bdaddr_t *dst = mgr->l2cap_conn->dst;
114         struct hci_conn *hcon;
115 
116         hcon = hci_conn_add(hdev, AMP_LINK, dst);
117         if (!hcon)
118                 return NULL;
119 
120         BT_DBG("hcon %p dst %pMR", hcon, dst);
121 
122         hcon->state = BT_CONNECT;
123         hcon->attempt++;
124         hcon->handle = __next_handle(mgr);
125         hcon->remote_id = remote_id;
126         hcon->amp_mgr = amp_mgr_get(mgr);
127         hcon->out = out;
128 
129         return hcon;
130 }
131 
132 /* AMP crypto key generation interface */
133 static int hmac_sha256(u8 *key, u8 ksize, char *plaintext, u8 psize, u8 *output)
134 {
135         int ret = 0;
136         struct crypto_shash *tfm;
137 
138         if (!ksize)
139                 return -EINVAL;
140 
141         tfm = crypto_alloc_shash("hmac(sha256)", 0, 0);
142         if (IS_ERR(tfm)) {
143                 BT_DBG("crypto_alloc_ahash failed: err %ld", PTR_ERR(tfm));
144                 return PTR_ERR(tfm);
145         }
146 
147         ret = crypto_shash_setkey(tfm, key, ksize);
148         if (ret) {
149                 BT_DBG("crypto_ahash_setkey failed: err %d", ret);
150         } else {
151                 struct {
152                         struct shash_desc shash;
153                         char ctx[crypto_shash_descsize(tfm)];
154                 } desc;
155 
156                 desc.shash.tfm = tfm;
157                 desc.shash.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
158 
159                 ret = crypto_shash_digest(&desc.shash, plaintext, psize,
160                                           output);
161         }
162 
163         crypto_free_shash(tfm);
164         return ret;
165 }
166 
167 int 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         /* Legacy key */
181         if (conn->key_type < 3) {
182                 BT_ERR("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         /* BR/EDR Link Key concatenated together with itself */
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         /* Derive Generic AMP Link Key (gamp) */
200         err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
201         if (err) {
202                 BT_ERR("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         /* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
213         return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
214 }
215 
216 void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
217 {
218         struct hci_cp_read_local_amp_assoc cp;
219         struct amp_assoc *loc_assoc = &hdev->loc_assoc;
220 
221         BT_DBG("%s handle %d", hdev->name, phy_handle);
222 
223         cp.phy_handle = phy_handle;
224         cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
225         cp.len_so_far = cpu_to_le16(loc_assoc->offset);
226 
227         hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
228 }
229 
230 void amp_read_loc_assoc(struct hci_dev *hdev, struct amp_mgr *mgr)
231 {
232         struct hci_cp_read_local_amp_assoc cp;
233 
234         memset(&hdev->loc_assoc, 0, sizeof(struct amp_assoc));
235         memset(&cp, 0, sizeof(cp));
236 
237         cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
238 
239         set_bit(READ_LOC_AMP_ASSOC, &mgr->state);
240         hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
241 }
242 
243 void amp_read_loc_assoc_final_data(struct hci_dev *hdev,
244                                    struct hci_conn *hcon)
245 {
246         struct hci_cp_read_local_amp_assoc cp;
247         struct amp_mgr *mgr = hcon->amp_mgr;
248 
249         cp.phy_handle = hcon->handle;
250         cp.len_so_far = cpu_to_le16(0);
251         cp.max_len = cpu_to_le16(hdev->amp_assoc_size);
252 
253         set_bit(READ_LOC_AMP_ASSOC_FINAL, &mgr->state);
254 
255         /* Read Local AMP Assoc final link information data */
256         hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_ASSOC, sizeof(cp), &cp);
257 }
258 
259 /* Write AMP Assoc data fragments, returns true with last fragment written*/
260 static bool amp_write_rem_assoc_frag(struct hci_dev *hdev,
261                                      struct hci_conn *hcon)
262 {
263         struct hci_cp_write_remote_amp_assoc *cp;
264         struct amp_mgr *mgr = hcon->amp_mgr;
265         struct amp_ctrl *ctrl;
266         u16 frag_len, len;
267 
268         ctrl = amp_ctrl_lookup(mgr, hcon->remote_id);
269         if (!ctrl)
270                 return false;
271 
272         if (!ctrl->assoc_rem_len) {
273                 BT_DBG("all fragments are written");
274                 ctrl->assoc_rem_len = ctrl->assoc_len;
275                 ctrl->assoc_len_so_far = 0;
276 
277                 amp_ctrl_put(ctrl);
278                 return true;
279         }
280 
281         frag_len = min_t(u16, 248, ctrl->assoc_rem_len);
282         len = frag_len + sizeof(*cp);
283 
284         cp = kzalloc(len, GFP_KERNEL);
285         if (!cp) {
286                 amp_ctrl_put(ctrl);
287                 return false;
288         }
289 
290         BT_DBG("hcon %p ctrl %p frag_len %u assoc_len %u rem_len %u",
291                hcon, ctrl, frag_len, ctrl->assoc_len, ctrl->assoc_rem_len);
292 
293         cp->phy_handle = hcon->handle;
294         cp->len_so_far = cpu_to_le16(ctrl->assoc_len_so_far);
295         cp->rem_len = cpu_to_le16(ctrl->assoc_rem_len);
296         memcpy(cp->frag, ctrl->assoc, frag_len);
297 
298         ctrl->assoc_len_so_far += frag_len;
299         ctrl->assoc_rem_len -= frag_len;
300 
301         amp_ctrl_put(ctrl);
302 
303         hci_send_cmd(hdev, HCI_OP_WRITE_REMOTE_AMP_ASSOC, len, cp);
304 
305         kfree(cp);
306 
307         return false;
308 }
309 
310 void amp_write_rem_assoc_continue(struct hci_dev *hdev, u8 handle)
311 {
312         struct hci_conn *hcon;
313 
314         BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
315 
316         hcon = hci_conn_hash_lookup_handle(hdev, handle);
317         if (!hcon)
318                 return;
319 
320         /* Send A2MP create phylink rsp when all fragments are written */
321         if (amp_write_rem_assoc_frag(hdev, hcon))
322                 a2mp_send_create_phy_link_rsp(hdev, 0);
323 }
324 
325 void amp_write_remote_assoc(struct hci_dev *hdev, u8 handle)
326 {
327         struct hci_conn *hcon;
328 
329         BT_DBG("%s phy handle 0x%2.2x", hdev->name, handle);
330 
331         hcon = hci_conn_hash_lookup_handle(hdev, handle);
332         if (!hcon)
333                 return;
334 
335         BT_DBG("%s phy handle 0x%2.2x hcon %p", hdev->name, handle, hcon);
336 
337         amp_write_rem_assoc_frag(hdev, hcon);
338 }
339 
340 void amp_create_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
341                         struct hci_conn *hcon)
342 {
343         struct hci_cp_create_phy_link cp;
344 
345         cp.phy_handle = hcon->handle;
346 
347         BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
348                hcon->handle);
349 
350         if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
351                             &cp.key_type)) {
352                 BT_DBG("Cannot create link key");
353                 return;
354         }
355 
356         hci_send_cmd(hdev, HCI_OP_CREATE_PHY_LINK, sizeof(cp), &cp);
357 }
358 
359 void amp_accept_phylink(struct hci_dev *hdev, struct amp_mgr *mgr,
360                         struct hci_conn *hcon)
361 {
362         struct hci_cp_accept_phy_link cp;
363 
364         cp.phy_handle = hcon->handle;
365 
366         BT_DBG("%s hcon %p phy handle 0x%2.2x", hdev->name, hcon,
367                hcon->handle);
368 
369         if (phylink_gen_key(mgr->l2cap_conn->hcon, cp.key, &cp.key_len,
370                             &cp.key_type)) {
371                 BT_DBG("Cannot create link key");
372                 return;
373         }
374 
375         hci_send_cmd(hdev, HCI_OP_ACCEPT_PHY_LINK, sizeof(cp), &cp);
376 }
377 
378 void amp_physical_cfm(struct hci_conn *bredr_hcon, struct hci_conn *hs_hcon)
379 {
380         struct hci_dev *bredr_hdev = hci_dev_hold(bredr_hcon->hdev);
381         struct amp_mgr *mgr = hs_hcon->amp_mgr;
382         struct l2cap_chan *bredr_chan;
383 
384         BT_DBG("bredr_hcon %p hs_hcon %p mgr %p", bredr_hcon, hs_hcon, mgr);
385 
386         if (!bredr_hdev || !mgr || !mgr->bredr_chan)
387                 return;
388 
389         bredr_chan = mgr->bredr_chan;
390 
391         l2cap_chan_lock(bredr_chan);
392 
393         set_bit(FLAG_EFS_ENABLE, &bredr_chan->flags);
394         bredr_chan->remote_amp_id = hs_hcon->remote_id;
395         bredr_chan->local_amp_id = hs_hcon->hdev->id;
396         bredr_chan->hs_hcon = hs_hcon;
397         bredr_chan->conn->mtu = hs_hcon->hdev->block_mtu;
398 
399         __l2cap_physical_cfm(bredr_chan, 0);
400 
401         l2cap_chan_unlock(bredr_chan);
402 
403         hci_dev_put(bredr_hdev);
404 }
405 
406 void amp_create_logical_link(struct l2cap_chan *chan)
407 {
408         struct hci_conn *hs_hcon = chan->hs_hcon;
409         struct hci_cp_create_accept_logical_link cp;
410         struct hci_dev *hdev;
411 
412         BT_DBG("chan %p hs_hcon %p dst %pMR", chan, hs_hcon, chan->conn->dst);
413 
414         if (!hs_hcon)
415                 return;
416 
417         hdev = hci_dev_hold(chan->hs_hcon->hdev);
418         if (!hdev)
419                 return;
420 
421         cp.phy_handle = hs_hcon->handle;
422 
423         cp.tx_flow_spec.id = chan->local_id;
424         cp.tx_flow_spec.stype = chan->local_stype;
425         cp.tx_flow_spec.msdu = cpu_to_le16(chan->local_msdu);
426         cp.tx_flow_spec.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
427         cp.tx_flow_spec.acc_lat = cpu_to_le32(chan->local_acc_lat);
428         cp.tx_flow_spec.flush_to = cpu_to_le32(chan->local_flush_to);
429 
430         cp.rx_flow_spec.id = chan->remote_id;
431         cp.rx_flow_spec.stype = chan->remote_stype;
432         cp.rx_flow_spec.msdu = cpu_to_le16(chan->remote_msdu);
433         cp.rx_flow_spec.sdu_itime = cpu_to_le32(chan->remote_sdu_itime);
434         cp.rx_flow_spec.acc_lat = cpu_to_le32(chan->remote_acc_lat);
435         cp.rx_flow_spec.flush_to = cpu_to_le32(chan->remote_flush_to);
436 
437         if (hs_hcon->out)
438                 hci_send_cmd(hdev, HCI_OP_CREATE_LOGICAL_LINK, sizeof(cp),
439                              &cp);
440         else
441                 hci_send_cmd(hdev, HCI_OP_ACCEPT_LOGICAL_LINK, sizeof(cp),
442                              &cp);
443 
444         hci_dev_put(hdev);
445 }
446 
447 void amp_disconnect_logical_link(struct hci_chan *hchan)
448 {
449         struct hci_conn *hcon = hchan->conn;
450         struct hci_cp_disconn_logical_link cp;
451 
452         if (hcon->state != BT_CONNECTED) {
453                 BT_DBG("hchan %p not connected", hchan);
454                 return;
455         }
456 
457         cp.log_handle = cpu_to_le16(hchan->handle);
458         hci_send_cmd(hcon->hdev, HCI_OP_DISCONN_LOGICAL_LINK, sizeof(cp), &cp);
459 }
460 
461 void amp_destroy_logical_link(struct hci_chan *hchan, u8 reason)
462 {
463         BT_DBG("hchan %p", hchan);
464 
465         hci_chan_del(hchan);
466 }
467 

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