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Bluetooth: Make AES crypto context private to SMP

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Now that we have per-adapter SMP data thanks to the root SMP L2CAP
channel we can take advantage of it and attach the AES crypto context
(only used for SMP) to it. This means that the smp_irk_matches() and
smp_generate_rpa() function can be converted to internally handle the
AES context.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-08-08 09:37:17 +03:00 committed by Marcel Holtmann
parent 70db83c4bc
commit defce9e836
4 changed files with 32 additions and 28 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
include/net/bluetooth/hci_core.h
View file

@ -302,7 +302,6 @@ struct hci_dev {
__u32 req_status;
__u32 req_result;
struct crypto_blkcipher *tfm_aes;
void *smp_data;
struct discovery_state discovery;

13
net/bluetooth/hci_core.c
View file

@ -3234,11 +3234,8 @@ struct smp_irk *hci_find_irk_by_rpa(struct hci_dev *hdev, bdaddr_t *rpa)
return irk;
}
if (!hdev->tfm_aes)
return NULL;
list_for_each_entry(irk, &hdev->identity_resolving_keys, list) {
if (smp_irk_matches(hdev->tfm_aes, irk->val, rpa)) {
if (smp_irk_matches(hdev, irk->val, rpa)) {
bacpy(&irk->rpa, rpa);
return irk;
}
@ -3887,13 +3884,7 @@ int hci_update_random_address(struct hci_request *req, bool require_privacy,
!bacmp(&hdev->random_addr, &hdev->rpa))
return 0;
if (!hdev->tfm_aes) {
BT_ERR("%s crypto not available to generate RPA",
hdev->name);
return -EOPNOTSUPP;
}
err = smp_generate_rpa(hdev->tfm_aes, hdev->irk, &hdev->rpa);
err = smp_generate_rpa(hdev, hdev->irk, &hdev->rpa);
if (err < 0) {
BT_ERR("%s failed to generate new RPA", hdev->name);
return err;

41
net/bluetooth/smp.c
View file

@ -139,12 +139,18 @@ static int smp_ah(struct crypto_blkcipher *tfm, u8 irk[16], u8 r[3], u8 res[3])
return 0;
}
bool smp_irk_matches(struct crypto_blkcipher *tfm, u8 irk[16],
bdaddr_t *bdaddr)
bool smp_irk_matches(struct hci_dev *hdev, u8 irk[16], bdaddr_t *bdaddr)
{
struct l2cap_chan *chan = hdev->smp_data;
struct crypto_blkcipher *tfm;
u8 hash[3];
int err;
if (!chan || !chan->data)
return false;
tfm = chan->data;
BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk);
err = smp_ah(tfm, irk, &bdaddr->b[3], hash);
@ -154,10 +160,17 @@ bool smp_irk_matches(struct crypto_blkcipher *tfm, u8 irk[16],
return !memcmp(bdaddr->b, hash, 3);
}
int smp_generate_rpa(struct crypto_blkcipher *tfm, u8 irk[16], bdaddr_t *rpa)
int smp_generate_rpa(struct hci_dev *hdev, u8 irk[16], bdaddr_t *rpa)
{
struct l2cap_chan *chan = hdev->smp_data;
struct crypto_blkcipher *tfm;
int err;
if (!chan || !chan->data)
return -EOPNOTSUPP;
tfm = chan->data;
get_random_bytes(&rpa->b[3], 3);
rpa->b[5] &= 0x3f; /* Clear two most significant bits */
@ -1555,25 +1568,25 @@ static const struct l2cap_ops smp_root_chan_ops = {
int smp_register(struct hci_dev *hdev)
{
struct l2cap_chan *chan;
struct crypto_blkcipher *tfm_aes;
BT_DBG("%s", hdev->name);
hdev->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(hdev->tfm_aes)) {
int err = PTR_ERR(hdev->tfm_aes);
tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm_aes)) {
int err = PTR_ERR(tfm_aes);
BT_ERR("Unable to create crypto context");
hdev->tfm_aes = NULL;
return err;
}
chan = l2cap_chan_create();
if (!chan) {
crypto_free_blkcipher(hdev->tfm_aes);
hdev->tfm_aes = NULL;
crypto_free_blkcipher(tfm_aes);
return -ENOMEM;
}
chan->data = tfm_aes;
/* FIXME: Using reserved 0x1f value for now - to be changed to
* L2CAP_CID_SMP once all functionality is in place.
*/
@ -1596,15 +1609,17 @@ int smp_register(struct hci_dev *hdev)
void smp_unregister(struct hci_dev *hdev)
{
struct l2cap_chan *chan = hdev->smp_data;
struct crypto_blkcipher *tfm_aes;
if (!chan)
return;
BT_DBG("%s chan %p", hdev->name, chan);
if (hdev->tfm_aes) {
crypto_free_blkcipher(hdev->tfm_aes);
hdev->tfm_aes = NULL;
tfm_aes = chan->data;
if (tfm_aes) {
chan->data = NULL;
crypto_free_blkcipher(tfm_aes);
}
hdev->smp_data = NULL;

5
net/bluetooth/smp.h
View file

@ -132,9 +132,8 @@ int smp_user_confirm_reply(struct hci_conn *conn, u16 mgmt_op, __le32 passkey);
void smp_chan_destroy(struct l2cap_conn *conn);
bool smp_irk_matches(struct crypto_blkcipher *tfm, u8 irk[16],
bdaddr_t *bdaddr);
int smp_generate_rpa(struct crypto_blkcipher *tfm, u8 irk[16], bdaddr_t *rpa);
bool smp_irk_matches(struct hci_dev *hdev, u8 irk[16], bdaddr_t *bdaddr);
int smp_generate_rpa(struct hci_dev *hdev, u8 irk[16], bdaddr_t *rpa);
int smp_register(struct hci_dev *hdev);
void smp_unregister(struct hci_dev *hdev);