Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / net / bluetooth / smp.c
blob759b63572641012b4c89fa5f48fcf6c68eee6918
1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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;
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.
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.
23 #include <net/bluetooth/bluetooth.h>
24 #include <net/bluetooth/hci_core.h>
25 #include <net/bluetooth/l2cap.h>
26 #include <net/bluetooth/smp.h>
27 #include <linux/crypto.h>
28 #include <linux/scatterlist.h>
29 #include <crypto/b128ops.h>
31 #define SMP_TIMEOUT 30000 /* 30 seconds */
33 static inline void swap128(u8 src[16], u8 dst[16])
35 int i;
36 for (i = 0; i < 16; i++)
37 dst[15 - i] = src[i];
40 static inline void swap56(u8 src[7], u8 dst[7])
42 int i;
43 for (i = 0; i < 7; i++)
44 dst[6 - i] = src[i];
47 static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
49 struct blkcipher_desc desc;
50 struct scatterlist sg;
51 int err, iv_len;
52 unsigned char iv[128];
54 if (tfm == NULL) {
55 BT_ERR("tfm %p", tfm);
56 return -EINVAL;
59 desc.tfm = tfm;
60 desc.flags = 0;
62 err = crypto_blkcipher_setkey(tfm, k, 16);
63 if (err) {
64 BT_ERR("cipher setkey failed: %d", err);
65 return err;
68 sg_init_one(&sg, r, 16);
70 iv_len = crypto_blkcipher_ivsize(tfm);
71 if (iv_len) {
72 memset(&iv, 0xff, iv_len);
73 crypto_blkcipher_set_iv(tfm, iv, iv_len);
76 err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16);
77 if (err)
78 BT_ERR("Encrypt data error %d", err);
80 return err;
83 static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16],
84 u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia,
85 u8 _rat, bdaddr_t *ra, u8 res[16])
87 u8 p1[16], p2[16];
88 int err;
90 memset(p1, 0, 16);
92 /* p1 = pres || preq || _rat || _iat */
93 swap56(pres, p1);
94 swap56(preq, p1 + 7);
95 p1[14] = _rat;
96 p1[15] = _iat;
98 memset(p2, 0, 16);
100 /* p2 = padding || ia || ra */
101 baswap((bdaddr_t *) (p2 + 4), ia);
102 baswap((bdaddr_t *) (p2 + 10), ra);
104 /* res = r XOR p1 */
105 u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
107 /* res = e(k, res) */
108 err = smp_e(tfm, k, res);
109 if (err) {
110 BT_ERR("Encrypt data error");
111 return err;
114 /* res = res XOR p2 */
115 u128_xor((u128 *) res, (u128 *) res, (u128 *) p2);
117 /* res = e(k, res) */
118 err = smp_e(tfm, k, res);
119 if (err)
120 BT_ERR("Encrypt data error");
122 return err;
125 static int smp_s1(struct crypto_blkcipher *tfm, u8 k[16],
126 u8 r1[16], u8 r2[16], u8 _r[16])
128 int err;
130 /* Just least significant octets from r1 and r2 are considered */
131 memcpy(_r, r1 + 8, 8);
132 memcpy(_r + 8, r2 + 8, 8);
134 err = smp_e(tfm, k, _r);
135 if (err)
136 BT_ERR("Encrypt data error");
138 return err;
141 static int smp_rand(u8 *buf)
143 get_random_bytes(buf, 16);
145 return 0;
148 static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code,
149 u16 dlen, void *data)
151 struct sk_buff *skb;
152 struct l2cap_hdr *lh;
153 int len;
155 len = L2CAP_HDR_SIZE + sizeof(code) + dlen;
157 if (len > conn->mtu)
158 return NULL;
160 skb = bt_skb_alloc(len, GFP_ATOMIC);
161 if (!skb)
162 return NULL;
164 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
165 lh->len = cpu_to_le16(sizeof(code) + dlen);
166 lh->cid = cpu_to_le16(L2CAP_CID_SMP);
168 memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code));
170 memcpy(skb_put(skb, dlen), data, dlen);
172 return skb;
175 static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
177 struct sk_buff *skb = smp_build_cmd(conn, code, len, data);
179 BT_DBG("code 0x%2.2x", code);
181 if (!skb)
182 return;
184 hci_send_acl(conn->hcon, skb, 0);
186 mod_timer(&conn->security_timer, jiffies +
187 msecs_to_jiffies(SMP_TIMEOUT));
190 static void build_pairing_cmd(struct l2cap_conn *conn,
191 struct smp_cmd_pairing *req,
192 struct smp_cmd_pairing *rsp,
193 __u8 authreq)
195 u8 dist_keys;
197 dist_keys = 0;
198 if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->flags)) {
199 dist_keys = SMP_DIST_ENC_KEY;
200 authreq |= SMP_AUTH_BONDING;
203 if (rsp == NULL) {
204 req->io_capability = conn->hcon->io_capability;
205 req->oob_flag = SMP_OOB_NOT_PRESENT;
206 req->max_key_size = SMP_MAX_ENC_KEY_SIZE;
207 req->init_key_dist = dist_keys;
208 req->resp_key_dist = dist_keys;
209 req->auth_req = authreq;
210 return;
213 rsp->io_capability = conn->hcon->io_capability;
214 rsp->oob_flag = SMP_OOB_NOT_PRESENT;
215 rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE;
216 rsp->init_key_dist = req->init_key_dist & dist_keys;
217 rsp->resp_key_dist = req->resp_key_dist & dist_keys;
218 rsp->auth_req = authreq;
221 static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
223 struct smp_chan *smp = conn->smp_chan;
225 if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) ||
226 (max_key_size < SMP_MIN_ENC_KEY_SIZE))
227 return SMP_ENC_KEY_SIZE;
229 smp->smp_key_size = max_key_size;
231 return 0;
234 static void confirm_work(struct work_struct *work)
236 struct smp_chan *smp = container_of(work, struct smp_chan, confirm);
237 struct l2cap_conn *conn = smp->conn;
238 struct crypto_blkcipher *tfm;
239 struct smp_cmd_pairing_confirm cp;
240 int ret;
241 u8 res[16], reason;
243 BT_DBG("conn %p", conn);
245 tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC);
246 if (IS_ERR(tfm)) {
247 reason = SMP_UNSPECIFIED;
248 goto error;
251 smp->tfm = tfm;
253 if (conn->hcon->out)
254 ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, 0,
255 conn->src, conn->hcon->dst_type, conn->dst,
256 res);
257 else
258 ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp,
259 conn->hcon->dst_type, conn->dst, 0, conn->src,
260 res);
261 if (ret) {
262 reason = SMP_UNSPECIFIED;
263 goto error;
266 swap128(res, cp.confirm_val);
267 smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
269 return;
271 error:
272 smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), &reason);
273 smp_chan_destroy(conn);
276 static void random_work(struct work_struct *work)
278 struct smp_chan *smp = container_of(work, struct smp_chan, random);
279 struct l2cap_conn *conn = smp->conn;
280 struct hci_conn *hcon = conn->hcon;
281 struct crypto_blkcipher *tfm = smp->tfm;
282 u8 reason, confirm[16], res[16], key[16];
283 int ret;
285 if (IS_ERR_OR_NULL(tfm)) {
286 reason = SMP_UNSPECIFIED;
287 goto error;
290 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
292 if (hcon->out)
293 ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, 0,
294 conn->src, hcon->dst_type, conn->dst,
295 res);
296 else
297 ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp,
298 hcon->dst_type, conn->dst, 0, conn->src,
299 res);
300 if (ret) {
301 reason = SMP_UNSPECIFIED;
302 goto error;
305 swap128(res, confirm);
307 if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) {
308 BT_ERR("Pairing failed (confirmation values mismatch)");
309 reason = SMP_CONFIRM_FAILED;
310 goto error;
313 if (hcon->out) {
314 u8 stk[16], rand[8];
315 __le16 ediv;
317 memset(rand, 0, sizeof(rand));
318 ediv = 0;
320 smp_s1(tfm, smp->tk, smp->rrnd, smp->prnd, key);
321 swap128(key, stk);
323 memset(stk + smp->smp_key_size, 0,
324 SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size);
326 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend)) {
327 reason = SMP_UNSPECIFIED;
328 goto error;
331 hci_le_start_enc(hcon, ediv, rand, stk);
332 hcon->enc_key_size = smp->smp_key_size;
333 } else {
334 u8 stk[16], r[16], rand[8];
335 __le16 ediv;
337 memset(rand, 0, sizeof(rand));
338 ediv = 0;
340 swap128(smp->prnd, r);
341 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r);
343 smp_s1(tfm, smp->tk, smp->prnd, smp->rrnd, key);
344 swap128(key, stk);
346 memset(stk + smp->smp_key_size, 0,
347 SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size);
349 hci_add_ltk(hcon->hdev, 0, conn->dst, smp->smp_key_size,
350 ediv, rand, stk);
353 return;
355 error:
356 smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), &reason);
357 smp_chan_destroy(conn);
360 static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
362 struct smp_chan *smp;
364 smp = kzalloc(sizeof(struct smp_chan), GFP_ATOMIC);
365 if (!smp)
366 return NULL;
368 INIT_WORK(&smp->confirm, confirm_work);
369 INIT_WORK(&smp->random, random_work);
371 smp->conn = conn;
372 conn->smp_chan = smp;
374 hci_conn_hold(conn->hcon);
376 return smp;
379 void smp_chan_destroy(struct l2cap_conn *conn)
381 kfree(conn->smp_chan);
382 hci_conn_put(conn->hcon);
385 static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
387 struct smp_cmd_pairing rsp, *req = (void *) skb->data;
388 struct smp_chan *smp;
389 u8 key_size;
390 int ret;
392 BT_DBG("conn %p", conn);
394 if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend))
395 smp = smp_chan_create(conn);
397 smp = conn->smp_chan;
399 smp->preq[0] = SMP_CMD_PAIRING_REQ;
400 memcpy(&smp->preq[1], req, sizeof(*req));
401 skb_pull(skb, sizeof(*req));
403 if (req->oob_flag)
404 return SMP_OOB_NOT_AVAIL;
406 /* We didn't start the pairing, so no requirements */
407 build_pairing_cmd(conn, req, &rsp, SMP_AUTH_NONE);
409 key_size = min(req->max_key_size, rsp.max_key_size);
410 if (check_enc_key_size(conn, key_size))
411 return SMP_ENC_KEY_SIZE;
413 /* Just works */
414 memset(smp->tk, 0, sizeof(smp->tk));
416 ret = smp_rand(smp->prnd);
417 if (ret)
418 return SMP_UNSPECIFIED;
420 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
421 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
423 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
425 return 0;
428 static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
430 struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
431 struct smp_chan *smp = conn->smp_chan;
432 struct hci_dev *hdev = conn->hcon->hdev;
433 u8 key_size;
434 int ret;
436 BT_DBG("conn %p", conn);
438 skb_pull(skb, sizeof(*rsp));
440 req = (void *) &smp->preq[1];
442 key_size = min(req->max_key_size, rsp->max_key_size);
443 if (check_enc_key_size(conn, key_size))
444 return SMP_ENC_KEY_SIZE;
446 if (rsp->oob_flag)
447 return SMP_OOB_NOT_AVAIL;
449 /* Just works */
450 memset(smp->tk, 0, sizeof(smp->tk));
452 ret = smp_rand(smp->prnd);
453 if (ret)
454 return SMP_UNSPECIFIED;
456 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
457 memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
459 queue_work(hdev->workqueue, &smp->confirm);
461 return 0;
464 static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
466 struct smp_chan *smp = conn->smp_chan;
467 struct hci_dev *hdev = conn->hcon->hdev;
469 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
471 memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
472 skb_pull(skb, sizeof(smp->pcnf));
474 if (conn->hcon->out) {
475 u8 random[16];
477 swap128(smp->prnd, random);
478 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random),
479 random);
480 } else {
481 queue_work(hdev->workqueue, &smp->confirm);
484 return 0;
487 static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
489 struct smp_chan *smp = conn->smp_chan;
490 struct hci_dev *hdev = conn->hcon->hdev;
492 BT_DBG("conn %p", conn);
494 swap128(skb->data, smp->rrnd);
495 skb_pull(skb, sizeof(smp->rrnd));
497 queue_work(hdev->workqueue, &smp->random);
499 return 0;
502 static u8 smp_ltk_encrypt(struct l2cap_conn *conn)
504 struct link_key *key;
505 struct key_master_id *master;
506 struct hci_conn *hcon = conn->hcon;
508 key = hci_find_link_key_type(hcon->hdev, conn->dst,
509 HCI_LK_SMP_LTK);
510 if (!key)
511 return 0;
513 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND,
514 &hcon->pend))
515 return 1;
517 master = (void *) key->data;
518 hci_le_start_enc(hcon, master->ediv, master->rand,
519 key->val);
520 hcon->enc_key_size = key->pin_len;
522 return 1;
525 static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
527 struct smp_cmd_security_req *rp = (void *) skb->data;
528 struct smp_cmd_pairing cp;
529 struct hci_conn *hcon = conn->hcon;
530 struct smp_chan *smp;
532 BT_DBG("conn %p", conn);
534 hcon->pending_sec_level = BT_SECURITY_MEDIUM;
536 if (smp_ltk_encrypt(conn))
537 return 0;
539 if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
540 return 0;
542 smp = smp_chan_create(conn);
544 skb_pull(skb, sizeof(*rp));
546 memset(&cp, 0, sizeof(cp));
547 build_pairing_cmd(conn, &cp, NULL, rp->auth_req);
549 smp->preq[0] = SMP_CMD_PAIRING_REQ;
550 memcpy(&smp->preq[1], &cp, sizeof(cp));
552 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
554 return 0;
557 int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
559 struct hci_conn *hcon = conn->hcon;
560 struct smp_chan *smp = conn->smp_chan;
562 BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
564 if (!lmp_host_le_capable(hcon->hdev))
565 return 1;
567 if (sec_level == BT_SECURITY_LOW)
568 return 1;
570 if (hcon->sec_level >= sec_level)
571 return 1;
573 if (hcon->link_mode & HCI_LM_MASTER)
574 if (smp_ltk_encrypt(conn))
575 goto done;
577 if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
578 return 0;
580 smp = smp_chan_create(conn);
582 if (hcon->link_mode & HCI_LM_MASTER) {
583 struct smp_cmd_pairing cp;
585 build_pairing_cmd(conn, &cp, NULL, SMP_AUTH_NONE);
586 smp->preq[0] = SMP_CMD_PAIRING_REQ;
587 memcpy(&smp->preq[1], &cp, sizeof(cp));
589 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
590 } else {
591 struct smp_cmd_security_req cp;
592 cp.auth_req = SMP_AUTH_NONE;
593 smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
596 done:
597 hcon->pending_sec_level = sec_level;
599 return 0;
602 static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
604 struct smp_cmd_encrypt_info *rp = (void *) skb->data;
605 struct smp_chan *smp = conn->smp_chan;
607 skb_pull(skb, sizeof(*rp));
609 memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
611 return 0;
614 static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
616 struct smp_cmd_master_ident *rp = (void *) skb->data;
617 struct smp_chan *smp = conn->smp_chan;
619 skb_pull(skb, sizeof(*rp));
621 hci_add_ltk(conn->hcon->hdev, 1, conn->src, smp->smp_key_size,
622 rp->ediv, rp->rand, smp->tk);
624 smp_distribute_keys(conn, 1);
626 return 0;
629 int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
631 __u8 code = skb->data[0];
632 __u8 reason;
633 int err = 0;
635 if (!lmp_host_le_capable(conn->hcon->hdev)) {
636 err = -ENOTSUPP;
637 reason = SMP_PAIRING_NOTSUPP;
638 goto done;
641 skb_pull(skb, sizeof(code));
643 switch (code) {
644 case SMP_CMD_PAIRING_REQ:
645 reason = smp_cmd_pairing_req(conn, skb);
646 break;
648 case SMP_CMD_PAIRING_FAIL:
649 reason = 0;
650 err = -EPERM;
651 break;
653 case SMP_CMD_PAIRING_RSP:
654 reason = smp_cmd_pairing_rsp(conn, skb);
655 break;
657 case SMP_CMD_SECURITY_REQ:
658 reason = smp_cmd_security_req(conn, skb);
659 break;
661 case SMP_CMD_PAIRING_CONFIRM:
662 reason = smp_cmd_pairing_confirm(conn, skb);
663 break;
665 case SMP_CMD_PAIRING_RANDOM:
666 reason = smp_cmd_pairing_random(conn, skb);
667 break;
669 case SMP_CMD_ENCRYPT_INFO:
670 reason = smp_cmd_encrypt_info(conn, skb);
671 break;
673 case SMP_CMD_MASTER_IDENT:
674 reason = smp_cmd_master_ident(conn, skb);
675 break;
677 case SMP_CMD_IDENT_INFO:
678 case SMP_CMD_IDENT_ADDR_INFO:
679 case SMP_CMD_SIGN_INFO:
680 /* Just ignored */
681 reason = 0;
682 break;
684 default:
685 BT_DBG("Unknown command code 0x%2.2x", code);
687 reason = SMP_CMD_NOTSUPP;
688 err = -EOPNOTSUPP;
689 goto done;
692 done:
693 if (reason)
694 smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
695 &reason);
697 kfree_skb(skb);
698 return err;
701 int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
703 struct smp_cmd_pairing *req, *rsp;
704 struct smp_chan *smp = conn->smp_chan;
705 __u8 *keydist;
707 BT_DBG("conn %p force %d", conn, force);
709 if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend))
710 return 0;
712 rsp = (void *) &smp->prsp[1];
714 /* The responder sends its keys first */
715 if (!force && conn->hcon->out && (rsp->resp_key_dist & 0x07))
716 return 0;
718 req = (void *) &smp->preq[1];
720 if (conn->hcon->out) {
721 keydist = &rsp->init_key_dist;
722 *keydist &= req->init_key_dist;
723 } else {
724 keydist = &rsp->resp_key_dist;
725 *keydist &= req->resp_key_dist;
729 BT_DBG("keydist 0x%x", *keydist);
731 if (*keydist & SMP_DIST_ENC_KEY) {
732 struct smp_cmd_encrypt_info enc;
733 struct smp_cmd_master_ident ident;
734 __le16 ediv;
736 get_random_bytes(enc.ltk, sizeof(enc.ltk));
737 get_random_bytes(&ediv, sizeof(ediv));
738 get_random_bytes(ident.rand, sizeof(ident.rand));
740 smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
742 hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->smp_key_size,
743 ediv, ident.rand, enc.ltk);
745 ident.ediv = cpu_to_le16(ediv);
747 smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident);
749 *keydist &= ~SMP_DIST_ENC_KEY;
752 if (*keydist & SMP_DIST_ID_KEY) {
753 struct smp_cmd_ident_addr_info addrinfo;
754 struct smp_cmd_ident_info idinfo;
756 /* Send a dummy key */
757 get_random_bytes(idinfo.irk, sizeof(idinfo.irk));
759 smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo);
761 /* Just public address */
762 memset(&addrinfo, 0, sizeof(addrinfo));
763 bacpy(&addrinfo.bdaddr, conn->src);
765 smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo),
766 &addrinfo);
768 *keydist &= ~SMP_DIST_ID_KEY;
771 if (*keydist & SMP_DIST_SIGN) {
772 struct smp_cmd_sign_info sign;
774 /* Send a dummy key */
775 get_random_bytes(sign.csrk, sizeof(sign.csrk));
777 smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign);
779 *keydist &= ~SMP_DIST_SIGN;
782 if (conn->hcon->out || force) {
783 clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend);
784 del_timer(&conn->security_timer);
785 smp_chan_destroy(conn);
788 return 0;