Commit | Line | Data |
---|---|---|
eb492e01 AB |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
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 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
20 | SOFTWARE IS DISCLAIMED. | |
21 | */ | |
22 | ||
23 | #include <net/bluetooth/bluetooth.h> | |
24 | #include <net/bluetooth/hci_core.h> | |
25 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 26 | #include <net/bluetooth/mgmt.h> |
eb492e01 | 27 | #include <net/bluetooth/smp.h> |
d22ef0bc | 28 | #include <linux/crypto.h> |
f70490e6 | 29 | #include <linux/scatterlist.h> |
d22ef0bc AB |
30 | #include <crypto/b128ops.h> |
31 | ||
17b02e62 | 32 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 33 | |
d22ef0bc AB |
34 | static inline void swap128(u8 src[16], u8 dst[16]) |
35 | { | |
36 | int i; | |
37 | for (i = 0; i < 16; i++) | |
38 | dst[15 - i] = src[i]; | |
39 | } | |
40 | ||
41 | static inline void swap56(u8 src[7], u8 dst[7]) | |
42 | { | |
43 | int i; | |
44 | for (i = 0; i < 7; i++) | |
45 | dst[6 - i] = src[i]; | |
46 | } | |
47 | ||
48 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
49 | { | |
50 | struct blkcipher_desc desc; | |
51 | struct scatterlist sg; | |
52 | int err, iv_len; | |
53 | unsigned char iv[128]; | |
54 | ||
55 | if (tfm == NULL) { | |
56 | BT_ERR("tfm %p", tfm); | |
57 | return -EINVAL; | |
58 | } | |
59 | ||
60 | desc.tfm = tfm; | |
61 | desc.flags = 0; | |
62 | ||
63 | err = crypto_blkcipher_setkey(tfm, k, 16); | |
64 | if (err) { | |
65 | BT_ERR("cipher setkey failed: %d", err); | |
66 | return err; | |
67 | } | |
68 | ||
69 | sg_init_one(&sg, r, 16); | |
70 | ||
71 | iv_len = crypto_blkcipher_ivsize(tfm); | |
72 | if (iv_len) { | |
73 | memset(&iv, 0xff, iv_len); | |
74 | crypto_blkcipher_set_iv(tfm, iv, iv_len); | |
75 | } | |
76 | ||
77 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); | |
78 | if (err) | |
79 | BT_ERR("Encrypt data error %d", err); | |
80 | ||
81 | return err; | |
82 | } | |
83 | ||
84 | static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16], | |
85 | u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia, | |
86 | u8 _rat, bdaddr_t *ra, u8 res[16]) | |
87 | { | |
88 | u8 p1[16], p2[16]; | |
89 | int err; | |
90 | ||
91 | memset(p1, 0, 16); | |
92 | ||
93 | /* p1 = pres || preq || _rat || _iat */ | |
94 | swap56(pres, p1); | |
95 | swap56(preq, p1 + 7); | |
96 | p1[14] = _rat; | |
97 | p1[15] = _iat; | |
98 | ||
99 | memset(p2, 0, 16); | |
100 | ||
101 | /* p2 = padding || ia || ra */ | |
102 | baswap((bdaddr_t *) (p2 + 4), ia); | |
103 | baswap((bdaddr_t *) (p2 + 10), ra); | |
104 | ||
105 | /* res = r XOR p1 */ | |
106 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
107 | ||
108 | /* res = e(k, res) */ | |
109 | err = smp_e(tfm, k, res); | |
110 | if (err) { | |
111 | BT_ERR("Encrypt data error"); | |
112 | return err; | |
113 | } | |
114 | ||
115 | /* res = res XOR p2 */ | |
116 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
117 | ||
118 | /* res = e(k, res) */ | |
119 | err = smp_e(tfm, k, res); | |
120 | if (err) | |
121 | BT_ERR("Encrypt data error"); | |
122 | ||
123 | return err; | |
124 | } | |
125 | ||
126 | static int smp_s1(struct crypto_blkcipher *tfm, u8 k[16], | |
127 | u8 r1[16], u8 r2[16], u8 _r[16]) | |
128 | { | |
129 | int err; | |
130 | ||
131 | /* Just least significant octets from r1 and r2 are considered */ | |
132 | memcpy(_r, r1 + 8, 8); | |
133 | memcpy(_r + 8, r2 + 8, 8); | |
134 | ||
135 | err = smp_e(tfm, k, _r); | |
136 | if (err) | |
137 | BT_ERR("Encrypt data error"); | |
138 | ||
139 | return err; | |
140 | } | |
141 | ||
142 | static int smp_rand(u8 *buf) | |
143 | { | |
144 | get_random_bytes(buf, 16); | |
145 | ||
146 | return 0; | |
147 | } | |
eb492e01 AB |
148 | |
149 | static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code, | |
150 | u16 dlen, void *data) | |
151 | { | |
152 | struct sk_buff *skb; | |
153 | struct l2cap_hdr *lh; | |
154 | int len; | |
155 | ||
156 | len = L2CAP_HDR_SIZE + sizeof(code) + dlen; | |
157 | ||
158 | if (len > conn->mtu) | |
159 | return NULL; | |
160 | ||
161 | skb = bt_skb_alloc(len, GFP_ATOMIC); | |
162 | if (!skb) | |
163 | return NULL; | |
164 | ||
165 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
166 | lh->len = cpu_to_le16(sizeof(code) + dlen); | |
167 | lh->cid = cpu_to_le16(L2CAP_CID_SMP); | |
168 | ||
169 | memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code)); | |
170 | ||
171 | memcpy(skb_put(skb, dlen), data, dlen); | |
172 | ||
173 | return skb; | |
174 | } | |
175 | ||
176 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) | |
177 | { | |
178 | struct sk_buff *skb = smp_build_cmd(conn, code, len, data); | |
179 | ||
180 | BT_DBG("code 0x%2.2x", code); | |
181 | ||
182 | if (!skb) | |
183 | return; | |
184 | ||
73d80deb LAD |
185 | skb->priority = HCI_PRIO_MAX; |
186 | hci_send_acl(conn->hchan, skb, 0); | |
e2dcd113 | 187 | |
6c9d42a1 | 188 | cancel_delayed_work_sync(&conn->security_timer); |
17b02e62 | 189 | schedule_delayed_work(&conn->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
190 | } |
191 | ||
2b64d153 BG |
192 | static __u8 authreq_to_seclevel(__u8 authreq) |
193 | { | |
194 | if (authreq & SMP_AUTH_MITM) | |
195 | return BT_SECURITY_HIGH; | |
196 | else | |
197 | return BT_SECURITY_MEDIUM; | |
198 | } | |
199 | ||
200 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
201 | { | |
202 | switch (sec_level) { | |
203 | case BT_SECURITY_HIGH: | |
204 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
205 | case BT_SECURITY_MEDIUM: | |
206 | return SMP_AUTH_BONDING; | |
207 | default: | |
208 | return SMP_AUTH_NONE; | |
209 | } | |
210 | } | |
211 | ||
b8e66eac | 212 | static void build_pairing_cmd(struct l2cap_conn *conn, |
54790f73 VCG |
213 | struct smp_cmd_pairing *req, |
214 | struct smp_cmd_pairing *rsp, | |
215 | __u8 authreq) | |
b8e66eac | 216 | { |
2b64d153 | 217 | u8 dist_keys = 0; |
54790f73 | 218 | |
a8b2d5c2 | 219 | if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->dev_flags)) { |
ca10b5ee | 220 | dist_keys = SMP_DIST_ENC_KEY; |
54790f73 | 221 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
222 | } else { |
223 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
224 | } |
225 | ||
226 | if (rsp == NULL) { | |
227 | req->io_capability = conn->hcon->io_capability; | |
228 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
229 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
2b64d153 | 230 | req->init_key_dist = 0; |
54790f73 VCG |
231 | req->resp_key_dist = dist_keys; |
232 | req->auth_req = authreq; | |
233 | return; | |
234 | } | |
235 | ||
236 | rsp->io_capability = conn->hcon->io_capability; | |
237 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
238 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
2b64d153 | 239 | rsp->init_key_dist = 0; |
54790f73 VCG |
240 | rsp->resp_key_dist = req->resp_key_dist & dist_keys; |
241 | rsp->auth_req = authreq; | |
b8e66eac VCG |
242 | } |
243 | ||
3158c50c VCG |
244 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
245 | { | |
1c1def09 VCG |
246 | struct smp_chan *smp = conn->smp_chan; |
247 | ||
3158c50c VCG |
248 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
249 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) | |
250 | return SMP_ENC_KEY_SIZE; | |
251 | ||
f7aa611a | 252 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
253 | |
254 | return 0; | |
255 | } | |
256 | ||
4f957a76 BG |
257 | static void smp_failure(struct l2cap_conn *conn, u8 reason, u8 send) |
258 | { | |
bab73cb6 JH |
259 | struct hci_conn *hcon = conn->hcon; |
260 | ||
4f957a76 BG |
261 | if (send) |
262 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), | |
263 | &reason); | |
264 | ||
51a8efd7 | 265 | clear_bit(HCI_CONN_ENCRYPT_PEND, &conn->hcon->flags); |
bab73cb6 | 266 | mgmt_auth_failed(conn->hcon->hdev, conn->dst, hcon->type, |
04124681 | 267 | hcon->dst_type, reason); |
f1c09c07 VCG |
268 | |
269 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
270 | cancel_delayed_work_sync(&conn->security_timer); | |
271 | smp_chan_destroy(conn); | |
272 | } | |
4f957a76 BG |
273 | } |
274 | ||
2b64d153 BG |
275 | #define JUST_WORKS 0x00 |
276 | #define JUST_CFM 0x01 | |
277 | #define REQ_PASSKEY 0x02 | |
278 | #define CFM_PASSKEY 0x03 | |
279 | #define REQ_OOB 0x04 | |
280 | #define OVERLAP 0xFF | |
281 | ||
282 | static const u8 gen_method[5][5] = { | |
283 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
284 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
285 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
286 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
287 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
288 | }; | |
289 | ||
290 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, | |
291 | u8 local_io, u8 remote_io) | |
292 | { | |
293 | struct hci_conn *hcon = conn->hcon; | |
294 | struct smp_chan *smp = conn->smp_chan; | |
295 | u8 method; | |
296 | u32 passkey = 0; | |
297 | int ret = 0; | |
298 | ||
299 | /* Initialize key for JUST WORKS */ | |
300 | memset(smp->tk, 0, sizeof(smp->tk)); | |
301 | clear_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); | |
302 | ||
303 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
304 | ||
305 | /* If neither side wants MITM, use JUST WORKS */ | |
306 | /* If either side has unknown io_caps, use JUST WORKS */ | |
307 | /* Otherwise, look up method from the table */ | |
308 | if (!(auth & SMP_AUTH_MITM) || | |
309 | local_io > SMP_IO_KEYBOARD_DISPLAY || | |
310 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
311 | method = JUST_WORKS; | |
312 | else | |
b3ff53ff | 313 | method = gen_method[remote_io][local_io]; |
2b64d153 BG |
314 | |
315 | /* If not bonding, don't ask user to confirm a Zero TK */ | |
316 | if (!(auth & SMP_AUTH_BONDING) && method == JUST_CFM) | |
317 | method = JUST_WORKS; | |
318 | ||
319 | /* If Just Works, Continue with Zero TK */ | |
320 | if (method == JUST_WORKS) { | |
321 | set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); | |
322 | return 0; | |
323 | } | |
324 | ||
325 | /* Not Just Works/Confirm results in MITM Authentication */ | |
326 | if (method != JUST_CFM) | |
327 | set_bit(SMP_FLAG_MITM_AUTH, &smp->smp_flags); | |
328 | ||
329 | /* If both devices have Keyoard-Display I/O, the master | |
330 | * Confirms and the slave Enters the passkey. | |
331 | */ | |
332 | if (method == OVERLAP) { | |
333 | if (hcon->link_mode & HCI_LM_MASTER) | |
334 | method = CFM_PASSKEY; | |
335 | else | |
336 | method = REQ_PASSKEY; | |
337 | } | |
338 | ||
339 | /* Generate random passkey. Not valid until confirmed. */ | |
340 | if (method == CFM_PASSKEY) { | |
341 | u8 key[16]; | |
342 | ||
343 | memset(key, 0, sizeof(key)); | |
344 | get_random_bytes(&passkey, sizeof(passkey)); | |
345 | passkey %= 1000000; | |
346 | put_unaligned_le32(passkey, key); | |
347 | swap128(key, smp->tk); | |
348 | BT_DBG("PassKey: %d", passkey); | |
349 | } | |
350 | ||
351 | hci_dev_lock(hcon->hdev); | |
352 | ||
353 | if (method == REQ_PASSKEY) | |
272d90df JH |
354 | ret = mgmt_user_passkey_request(hcon->hdev, conn->dst, |
355 | hcon->type, hcon->dst_type); | |
2b64d153 BG |
356 | else |
357 | ret = mgmt_user_confirm_request(hcon->hdev, conn->dst, | |
272d90df | 358 | hcon->type, hcon->dst_type, |
2b64d153 BG |
359 | cpu_to_le32(passkey), 0); |
360 | ||
361 | hci_dev_unlock(hcon->hdev); | |
362 | ||
363 | return ret; | |
364 | } | |
365 | ||
8aab4757 VCG |
366 | static void confirm_work(struct work_struct *work) |
367 | { | |
368 | struct smp_chan *smp = container_of(work, struct smp_chan, confirm); | |
369 | struct l2cap_conn *conn = smp->conn; | |
370 | struct crypto_blkcipher *tfm; | |
371 | struct smp_cmd_pairing_confirm cp; | |
372 | int ret; | |
373 | u8 res[16], reason; | |
374 | ||
375 | BT_DBG("conn %p", conn); | |
376 | ||
377 | tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); | |
378 | if (IS_ERR(tfm)) { | |
379 | reason = SMP_UNSPECIFIED; | |
380 | goto error; | |
381 | } | |
382 | ||
383 | smp->tfm = tfm; | |
384 | ||
385 | if (conn->hcon->out) | |
386 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, 0, | |
04124681 | 387 | conn->src, conn->hcon->dst_type, conn->dst, res); |
8aab4757 VCG |
388 | else |
389 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, | |
04124681 GP |
390 | conn->hcon->dst_type, conn->dst, 0, conn->src, |
391 | res); | |
8aab4757 VCG |
392 | if (ret) { |
393 | reason = SMP_UNSPECIFIED; | |
394 | goto error; | |
395 | } | |
396 | ||
2b64d153 BG |
397 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); |
398 | ||
8aab4757 VCG |
399 | swap128(res, cp.confirm_val); |
400 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); | |
401 | ||
402 | return; | |
403 | ||
404 | error: | |
4f957a76 | 405 | smp_failure(conn, reason, 1); |
8aab4757 VCG |
406 | } |
407 | ||
408 | static void random_work(struct work_struct *work) | |
409 | { | |
410 | struct smp_chan *smp = container_of(work, struct smp_chan, random); | |
411 | struct l2cap_conn *conn = smp->conn; | |
412 | struct hci_conn *hcon = conn->hcon; | |
413 | struct crypto_blkcipher *tfm = smp->tfm; | |
414 | u8 reason, confirm[16], res[16], key[16]; | |
415 | int ret; | |
416 | ||
417 | if (IS_ERR_OR_NULL(tfm)) { | |
418 | reason = SMP_UNSPECIFIED; | |
419 | goto error; | |
420 | } | |
421 | ||
422 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
423 | ||
424 | if (hcon->out) | |
425 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, 0, | |
04124681 | 426 | conn->src, hcon->dst_type, conn->dst, res); |
8aab4757 VCG |
427 | else |
428 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, | |
04124681 | 429 | hcon->dst_type, conn->dst, 0, conn->src, res); |
8aab4757 VCG |
430 | if (ret) { |
431 | reason = SMP_UNSPECIFIED; | |
432 | goto error; | |
433 | } | |
434 | ||
435 | swap128(res, confirm); | |
436 | ||
437 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { | |
438 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
439 | reason = SMP_CONFIRM_FAILED; | |
440 | goto error; | |
441 | } | |
442 | ||
443 | if (hcon->out) { | |
444 | u8 stk[16], rand[8]; | |
445 | __le16 ediv; | |
446 | ||
447 | memset(rand, 0, sizeof(rand)); | |
448 | ediv = 0; | |
449 | ||
450 | smp_s1(tfm, smp->tk, smp->rrnd, smp->prnd, key); | |
451 | swap128(key, stk); | |
452 | ||
f7aa611a | 453 | memset(stk + smp->enc_key_size, 0, |
04124681 | 454 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 455 | |
51a8efd7 | 456 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) { |
8aab4757 VCG |
457 | reason = SMP_UNSPECIFIED; |
458 | goto error; | |
459 | } | |
460 | ||
461 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 462 | hcon->enc_key_size = smp->enc_key_size; |
8aab4757 VCG |
463 | } else { |
464 | u8 stk[16], r[16], rand[8]; | |
465 | __le16 ediv; | |
466 | ||
467 | memset(rand, 0, sizeof(rand)); | |
468 | ediv = 0; | |
469 | ||
470 | swap128(smp->prnd, r); | |
471 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r); | |
472 | ||
473 | smp_s1(tfm, smp->tk, smp->prnd, smp->rrnd, key); | |
474 | swap128(key, stk); | |
475 | ||
f7aa611a VCG |
476 | memset(stk + smp->enc_key_size, 0, |
477 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); | |
8aab4757 | 478 | |
c9839a11 | 479 | hci_add_ltk(hcon->hdev, conn->dst, hcon->dst_type, |
04124681 GP |
480 | HCI_SMP_STK_SLAVE, 0, 0, stk, smp->enc_key_size, |
481 | ediv, rand); | |
8aab4757 VCG |
482 | } |
483 | ||
484 | return; | |
485 | ||
486 | error: | |
4f957a76 | 487 | smp_failure(conn, reason, 1); |
8aab4757 VCG |
488 | } |
489 | ||
490 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) | |
491 | { | |
492 | struct smp_chan *smp; | |
493 | ||
494 | smp = kzalloc(sizeof(struct smp_chan), GFP_ATOMIC); | |
495 | if (!smp) | |
496 | return NULL; | |
497 | ||
498 | INIT_WORK(&smp->confirm, confirm_work); | |
499 | INIT_WORK(&smp->random, random_work); | |
500 | ||
501 | smp->conn = conn; | |
502 | conn->smp_chan = smp; | |
2b64d153 | 503 | conn->hcon->smp_conn = conn; |
8aab4757 VCG |
504 | |
505 | hci_conn_hold(conn->hcon); | |
506 | ||
507 | return smp; | |
508 | } | |
509 | ||
510 | void smp_chan_destroy(struct l2cap_conn *conn) | |
511 | { | |
c8eb9690 BG |
512 | struct smp_chan *smp = conn->smp_chan; |
513 | ||
f1c09c07 | 514 | BUG_ON(!smp); |
c8eb9690 BG |
515 | |
516 | if (smp->tfm) | |
517 | crypto_free_blkcipher(smp->tfm); | |
518 | ||
519 | kfree(smp); | |
520 | conn->smp_chan = NULL; | |
2b64d153 | 521 | conn->hcon->smp_conn = NULL; |
8aab4757 VCG |
522 | hci_conn_put(conn->hcon); |
523 | } | |
524 | ||
2b64d153 BG |
525 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
526 | { | |
527 | struct l2cap_conn *conn = hcon->smp_conn; | |
528 | struct smp_chan *smp; | |
529 | u32 value; | |
530 | u8 key[16]; | |
531 | ||
532 | BT_DBG(""); | |
533 | ||
534 | if (!conn) | |
535 | return -ENOTCONN; | |
536 | ||
537 | smp = conn->smp_chan; | |
538 | ||
539 | switch (mgmt_op) { | |
540 | case MGMT_OP_USER_PASSKEY_REPLY: | |
541 | value = le32_to_cpu(passkey); | |
542 | memset(key, 0, sizeof(key)); | |
543 | BT_DBG("PassKey: %d", value); | |
544 | put_unaligned_le32(value, key); | |
545 | swap128(key, smp->tk); | |
546 | /* Fall Through */ | |
547 | case MGMT_OP_USER_CONFIRM_REPLY: | |
548 | set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); | |
549 | break; | |
550 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
551 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
552 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1); | |
553 | return 0; | |
554 | default: | |
555 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1); | |
556 | return -EOPNOTSUPP; | |
557 | } | |
558 | ||
559 | /* If it is our turn to send Pairing Confirm, do so now */ | |
560 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags)) | |
561 | queue_work(hcon->hdev->workqueue, &smp->confirm); | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
da85e5e5 | 566 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 567 | { |
3158c50c | 568 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
8aab4757 | 569 | struct smp_chan *smp; |
3158c50c | 570 | u8 key_size; |
2b64d153 | 571 | u8 auth = SMP_AUTH_NONE; |
8aab4757 | 572 | int ret; |
88ba43b6 AB |
573 | |
574 | BT_DBG("conn %p", conn); | |
575 | ||
2b64d153 BG |
576 | if (conn->hcon->link_mode & HCI_LM_MASTER) |
577 | return SMP_CMD_NOTSUPP; | |
578 | ||
51a8efd7 | 579 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) |
8aab4757 VCG |
580 | smp = smp_chan_create(conn); |
581 | ||
582 | smp = conn->smp_chan; | |
d26a2345 | 583 | |
1c1def09 VCG |
584 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
585 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 586 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 587 | |
2b64d153 BG |
588 | /* We didn't start the pairing, so match remote */ |
589 | if (req->auth_req & SMP_AUTH_BONDING) | |
590 | auth = req->auth_req; | |
da85e5e5 | 591 | |
fdde0a26 IY |
592 | conn->hcon->pending_sec_level = authreq_to_seclevel(auth); |
593 | ||
2b64d153 | 594 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
595 | |
596 | key_size = min(req->max_key_size, rsp.max_key_size); | |
597 | if (check_enc_key_size(conn, key_size)) | |
598 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 599 | |
8aab4757 VCG |
600 | ret = smp_rand(smp->prnd); |
601 | if (ret) | |
602 | return SMP_UNSPECIFIED; | |
603 | ||
1c1def09 VCG |
604 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
605 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 606 | |
3158c50c | 607 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 | 608 | |
2b64d153 BG |
609 | /* Request setup of TK */ |
610 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
611 | if (ret) | |
612 | return SMP_UNSPECIFIED; | |
613 | ||
da85e5e5 | 614 | return 0; |
88ba43b6 AB |
615 | } |
616 | ||
da85e5e5 | 617 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 618 | { |
3158c50c | 619 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
1c1def09 | 620 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 621 | struct hci_dev *hdev = conn->hcon->hdev; |
2b64d153 | 622 | u8 key_size, auth = SMP_AUTH_NONE; |
7d24ddcc | 623 | int ret; |
88ba43b6 AB |
624 | |
625 | BT_DBG("conn %p", conn); | |
626 | ||
2b64d153 BG |
627 | if (!(conn->hcon->link_mode & HCI_LM_MASTER)) |
628 | return SMP_CMD_NOTSUPP; | |
629 | ||
3158c50c VCG |
630 | skb_pull(skb, sizeof(*rsp)); |
631 | ||
1c1def09 | 632 | req = (void *) &smp->preq[1]; |
da85e5e5 | 633 | |
3158c50c VCG |
634 | key_size = min(req->max_key_size, rsp->max_key_size); |
635 | if (check_enc_key_size(conn, key_size)) | |
636 | return SMP_ENC_KEY_SIZE; | |
637 | ||
1c1def09 | 638 | ret = smp_rand(smp->prnd); |
7d24ddcc | 639 | if (ret) |
da85e5e5 | 640 | return SMP_UNSPECIFIED; |
7d24ddcc | 641 | |
8aab4757 VCG |
642 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
643 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 644 | |
2b64d153 BG |
645 | if ((req->auth_req & SMP_AUTH_BONDING) && |
646 | (rsp->auth_req & SMP_AUTH_BONDING)) | |
647 | auth = SMP_AUTH_BONDING; | |
648 | ||
649 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; | |
650 | ||
476585ec | 651 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
652 | if (ret) |
653 | return SMP_UNSPECIFIED; | |
654 | ||
655 | set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); | |
656 | ||
657 | /* Can't compose response until we have been confirmed */ | |
658 | if (!test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags)) | |
659 | return 0; | |
660 | ||
8aab4757 | 661 | queue_work(hdev->workqueue, &smp->confirm); |
da85e5e5 VCG |
662 | |
663 | return 0; | |
88ba43b6 AB |
664 | } |
665 | ||
da85e5e5 | 666 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 667 | { |
1c1def09 | 668 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 669 | struct hci_dev *hdev = conn->hcon->hdev; |
7d24ddcc | 670 | |
88ba43b6 AB |
671 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
672 | ||
1c1def09 VCG |
673 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
674 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 675 | |
7d24ddcc AB |
676 | if (conn->hcon->out) { |
677 | u8 random[16]; | |
88ba43b6 | 678 | |
1c1def09 | 679 | swap128(smp->prnd, random); |
88ba43b6 | 680 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random), |
7d24ddcc | 681 | random); |
2b64d153 | 682 | } else if (test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags)) { |
8aab4757 | 683 | queue_work(hdev->workqueue, &smp->confirm); |
2b64d153 BG |
684 | } else { |
685 | set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); | |
88ba43b6 | 686 | } |
da85e5e5 VCG |
687 | |
688 | return 0; | |
88ba43b6 AB |
689 | } |
690 | ||
da85e5e5 | 691 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 692 | { |
1c1def09 | 693 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 694 | struct hci_dev *hdev = conn->hcon->hdev; |
7d24ddcc | 695 | |
8aab4757 | 696 | BT_DBG("conn %p", conn); |
3158c50c | 697 | |
8aab4757 VCG |
698 | swap128(skb->data, smp->rrnd); |
699 | skb_pull(skb, sizeof(smp->rrnd)); | |
e7e62c85 | 700 | |
8aab4757 | 701 | queue_work(hdev->workqueue, &smp->random); |
da85e5e5 VCG |
702 | |
703 | return 0; | |
88ba43b6 AB |
704 | } |
705 | ||
988c5997 VCG |
706 | static u8 smp_ltk_encrypt(struct l2cap_conn *conn) |
707 | { | |
c9839a11 | 708 | struct smp_ltk *key; |
988c5997 VCG |
709 | struct hci_conn *hcon = conn->hcon; |
710 | ||
c9839a11 | 711 | key = hci_find_ltk_by_addr(hcon->hdev, conn->dst, hcon->dst_type); |
988c5997 VCG |
712 | if (!key) |
713 | return 0; | |
714 | ||
51a8efd7 | 715 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
988c5997 VCG |
716 | return 1; |
717 | ||
c9839a11 VCG |
718 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
719 | hcon->enc_key_size = key->enc_size; | |
988c5997 VCG |
720 | |
721 | return 1; | |
722 | ||
723 | } | |
da85e5e5 | 724 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
725 | { |
726 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
727 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 728 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 729 | struct smp_chan *smp; |
88ba43b6 AB |
730 | |
731 | BT_DBG("conn %p", conn); | |
732 | ||
2b64d153 | 733 | hcon->pending_sec_level = authreq_to_seclevel(rp->auth_req); |
feb45eb5 | 734 | |
988c5997 VCG |
735 | if (smp_ltk_encrypt(conn)) |
736 | return 0; | |
737 | ||
51a8efd7 | 738 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
da85e5e5 | 739 | return 0; |
f1cb9af5 | 740 | |
8aab4757 | 741 | smp = smp_chan_create(conn); |
d26a2345 | 742 | |
88ba43b6 | 743 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 744 | |
da85e5e5 | 745 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 746 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 747 | |
1c1def09 VCG |
748 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
749 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 750 | |
88ba43b6 | 751 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 752 | |
da85e5e5 | 753 | return 0; |
88ba43b6 AB |
754 | } |
755 | ||
eb492e01 AB |
756 | int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level) |
757 | { | |
3a0259bb | 758 | struct hci_conn *hcon = conn->hcon; |
1c1def09 | 759 | struct smp_chan *smp = conn->smp_chan; |
2b64d153 | 760 | __u8 authreq; |
eb492e01 | 761 | |
3a0259bb VCG |
762 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
763 | ||
2e65c9d2 AG |
764 | if (!lmp_host_le_capable(hcon->hdev)) |
765 | return 1; | |
766 | ||
f1cb9af5 VCG |
767 | if (sec_level == BT_SECURITY_LOW) |
768 | return 1; | |
eb492e01 | 769 | |
f1cb9af5 | 770 | if (hcon->sec_level >= sec_level) |
eb492e01 | 771 | return 1; |
f1cb9af5 | 772 | |
988c5997 VCG |
773 | if (hcon->link_mode & HCI_LM_MASTER) |
774 | if (smp_ltk_encrypt(conn)) | |
02bc7455 | 775 | goto done; |
d26a2345 | 776 | |
51a8efd7 | 777 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
778 | return 0; |
779 | ||
8aab4757 | 780 | smp = smp_chan_create(conn); |
2b64d153 BG |
781 | if (!smp) |
782 | return 1; | |
783 | ||
784 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 785 | |
d26a2345 VCG |
786 | if (hcon->link_mode & HCI_LM_MASTER) { |
787 | struct smp_cmd_pairing cp; | |
f01ead31 | 788 | |
2b64d153 | 789 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
790 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
791 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 792 | |
eb492e01 AB |
793 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
794 | } else { | |
795 | struct smp_cmd_security_req cp; | |
2b64d153 | 796 | cp.auth_req = authreq; |
eb492e01 AB |
797 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
798 | } | |
799 | ||
02bc7455 | 800 | done: |
f1cb9af5 | 801 | hcon->pending_sec_level = sec_level; |
f1cb9af5 | 802 | |
eb492e01 AB |
803 | return 0; |
804 | } | |
805 | ||
7034b911 VCG |
806 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
807 | { | |
16b90839 | 808 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
1c1def09 | 809 | struct smp_chan *smp = conn->smp_chan; |
16b90839 VCG |
810 | |
811 | skb_pull(skb, sizeof(*rp)); | |
812 | ||
1c1def09 | 813 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 814 | |
7034b911 VCG |
815 | return 0; |
816 | } | |
817 | ||
818 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
819 | { | |
16b90839 | 820 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
1c1def09 | 821 | struct smp_chan *smp = conn->smp_chan; |
c9839a11 VCG |
822 | struct hci_dev *hdev = conn->hcon->hdev; |
823 | struct hci_conn *hcon = conn->hcon; | |
824 | u8 authenticated; | |
16b90839 VCG |
825 | |
826 | skb_pull(skb, sizeof(*rp)); | |
7034b911 | 827 | |
c9839a11 VCG |
828 | hci_dev_lock(hdev); |
829 | authenticated = (conn->hcon->sec_level == BT_SECURITY_HIGH); | |
830 | hci_add_ltk(conn->hcon->hdev, conn->dst, hcon->dst_type, | |
04124681 GP |
831 | HCI_SMP_LTK, 1, authenticated, smp->tk, smp->enc_key_size, |
832 | rp->ediv, rp->rand); | |
7034b911 | 833 | smp_distribute_keys(conn, 1); |
c9839a11 | 834 | hci_dev_unlock(hdev); |
7034b911 VCG |
835 | |
836 | return 0; | |
837 | } | |
838 | ||
eb492e01 AB |
839 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) |
840 | { | |
841 | __u8 code = skb->data[0]; | |
842 | __u8 reason; | |
843 | int err = 0; | |
844 | ||
2e65c9d2 AG |
845 | if (!lmp_host_le_capable(conn->hcon->hdev)) { |
846 | err = -ENOTSUPP; | |
847 | reason = SMP_PAIRING_NOTSUPP; | |
848 | goto done; | |
849 | } | |
850 | ||
eb492e01 AB |
851 | skb_pull(skb, sizeof(code)); |
852 | ||
853 | switch (code) { | |
854 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 855 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
856 | break; |
857 | ||
858 | case SMP_CMD_PAIRING_FAIL: | |
4f957a76 | 859 | smp_failure(conn, skb->data[0], 0); |
da85e5e5 VCG |
860 | reason = 0; |
861 | err = -EPERM; | |
eb492e01 AB |
862 | break; |
863 | ||
864 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 865 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
866 | break; |
867 | ||
868 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 869 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
870 | break; |
871 | ||
eb492e01 | 872 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 873 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
874 | break; |
875 | ||
eb492e01 | 876 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 877 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
878 | break; |
879 | ||
eb492e01 | 880 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
881 | reason = smp_cmd_encrypt_info(conn, skb); |
882 | break; | |
883 | ||
eb492e01 | 884 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
885 | reason = smp_cmd_master_ident(conn, skb); |
886 | break; | |
887 | ||
eb492e01 AB |
888 | case SMP_CMD_IDENT_INFO: |
889 | case SMP_CMD_IDENT_ADDR_INFO: | |
890 | case SMP_CMD_SIGN_INFO: | |
7034b911 VCG |
891 | /* Just ignored */ |
892 | reason = 0; | |
893 | break; | |
894 | ||
eb492e01 AB |
895 | default: |
896 | BT_DBG("Unknown command code 0x%2.2x", code); | |
897 | ||
898 | reason = SMP_CMD_NOTSUPP; | |
eb492e01 | 899 | err = -EOPNOTSUPP; |
3a0259bb | 900 | goto done; |
eb492e01 AB |
901 | } |
902 | ||
3a0259bb VCG |
903 | done: |
904 | if (reason) | |
4f957a76 | 905 | smp_failure(conn, reason, 1); |
3a0259bb | 906 | |
eb492e01 AB |
907 | kfree_skb(skb); |
908 | return err; | |
909 | } | |
7034b911 VCG |
910 | |
911 | int smp_distribute_keys(struct l2cap_conn *conn, __u8 force) | |
912 | { | |
913 | struct smp_cmd_pairing *req, *rsp; | |
1c1def09 | 914 | struct smp_chan *smp = conn->smp_chan; |
7034b911 VCG |
915 | __u8 *keydist; |
916 | ||
917 | BT_DBG("conn %p force %d", conn, force); | |
918 | ||
51a8efd7 | 919 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) |
d26a2345 VCG |
920 | return 0; |
921 | ||
1c1def09 | 922 | rsp = (void *) &smp->prsp[1]; |
7034b911 VCG |
923 | |
924 | /* The responder sends its keys first */ | |
925 | if (!force && conn->hcon->out && (rsp->resp_key_dist & 0x07)) | |
926 | return 0; | |
927 | ||
1c1def09 | 928 | req = (void *) &smp->preq[1]; |
7034b911 VCG |
929 | |
930 | if (conn->hcon->out) { | |
931 | keydist = &rsp->init_key_dist; | |
932 | *keydist &= req->init_key_dist; | |
933 | } else { | |
934 | keydist = &rsp->resp_key_dist; | |
935 | *keydist &= req->resp_key_dist; | |
936 | } | |
937 | ||
938 | ||
939 | BT_DBG("keydist 0x%x", *keydist); | |
940 | ||
941 | if (*keydist & SMP_DIST_ENC_KEY) { | |
942 | struct smp_cmd_encrypt_info enc; | |
943 | struct smp_cmd_master_ident ident; | |
c9839a11 VCG |
944 | struct hci_conn *hcon = conn->hcon; |
945 | u8 authenticated; | |
7034b911 VCG |
946 | __le16 ediv; |
947 | ||
948 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
949 | get_random_bytes(&ediv, sizeof(ediv)); | |
950 | get_random_bytes(ident.rand, sizeof(ident.rand)); | |
951 | ||
952 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
953 | ||
c9839a11 VCG |
954 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; |
955 | hci_add_ltk(conn->hcon->hdev, conn->dst, hcon->dst_type, | |
04124681 GP |
956 | HCI_SMP_LTK_SLAVE, 1, authenticated, |
957 | enc.ltk, smp->enc_key_size, ediv, ident.rand); | |
16b90839 | 958 | |
58115373 | 959 | ident.ediv = ediv; |
7034b911 VCG |
960 | |
961 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
962 | ||
963 | *keydist &= ~SMP_DIST_ENC_KEY; | |
964 | } | |
965 | ||
966 | if (*keydist & SMP_DIST_ID_KEY) { | |
967 | struct smp_cmd_ident_addr_info addrinfo; | |
968 | struct smp_cmd_ident_info idinfo; | |
969 | ||
970 | /* Send a dummy key */ | |
971 | get_random_bytes(idinfo.irk, sizeof(idinfo.irk)); | |
972 | ||
973 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
974 | ||
975 | /* Just public address */ | |
976 | memset(&addrinfo, 0, sizeof(addrinfo)); | |
977 | bacpy(&addrinfo.bdaddr, conn->src); | |
978 | ||
979 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
980 | &addrinfo); | |
981 | ||
982 | *keydist &= ~SMP_DIST_ID_KEY; | |
983 | } | |
984 | ||
985 | if (*keydist & SMP_DIST_SIGN) { | |
986 | struct smp_cmd_sign_info sign; | |
987 | ||
988 | /* Send a dummy key */ | |
989 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
990 | ||
991 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
992 | ||
993 | *keydist &= ~SMP_DIST_SIGN; | |
994 | } | |
995 | ||
d26a2345 | 996 | if (conn->hcon->out || force) { |
51a8efd7 | 997 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags); |
6c9d42a1 | 998 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 999 | smp_chan_destroy(conn); |
d26a2345 VCG |
1000 | } |
1001 | ||
7034b911 VCG |
1002 | return 0; |
1003 | } |