Commit 75d262c2 authored by Vinicius Costa Gomes's avatar Vinicius Costa Gomes Committed by Gustavo F. Padovan
Browse files

Bluetooth: Add functions to manipulate the link key list for SMP 



As the LTK (the new type of key being handled now) has more data
associated with it, we need to store this extra data and retrieve
the keys based on that data.

Methods for searching for a key and for adding a new LTK are
introduced here.

Signed-off-by: default avatarVinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: default avatarGustavo F. Padovan <padovan@profusion.mobi>
parent 34918cd7

include/net/bluetooth/hci_core.h

+5 −0
Original line number Diff line number Diff line
@@ -553,6 +553,11 @@ int hci_link_keys_clear(struct hci_dev *hdev); 
struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr);

int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key,

			bdaddr_t *bdaddr, u8 *val, u8 type, u8 pin_len);

struct link_key *hci_find_ltk(struct hci_dev *hdev, __le16 ediv, u8 rand[8]);

struct link_key *hci_find_link_key_type(struct hci_dev *hdev,

					bdaddr_t *bdaddr, u8 type);

int hci_add_ltk(struct hci_dev *hdev, int new_key, bdaddr_t *bdaddr,

					__le16 ediv, u8 rand[8], u8 ltk[16]);

int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr);



int hci_remote_oob_data_clear(struct hci_dev *hdev);

net/bluetooth/hci_core.c

+73 −0
Original line number Diff line number Diff line
@@ -1057,6 +1057,42 @@ static int hci_persistent_key(struct hci_dev *hdev, struct hci_conn *conn, 
	return 0;

}



struct link_key *hci_find_ltk(struct hci_dev *hdev, __le16 ediv, u8 rand[8])

{

	struct link_key *k;



	list_for_each_entry(k, &hdev->link_keys, list) {

		struct key_master_id *id;



		if (k->type != HCI_LK_SMP_LTK)

			continue;



		if (k->dlen != sizeof(*id))

			continue;



		id = (void *) &k->data;

		if (id->ediv == ediv &&

				(memcmp(rand, id->rand, sizeof(id->rand)) == 0))

			return k;

	}



	return NULL;

}

EXPORT_SYMBOL(hci_find_ltk);



struct link_key *hci_find_link_key_type(struct hci_dev *hdev,

					bdaddr_t *bdaddr, u8 type)

{

	struct link_key *k;



	list_for_each_entry(k, &hdev->link_keys, list)

		if (k->type == type && bacmp(bdaddr, &k->bdaddr) == 0)

			return k;



	return NULL;

}

EXPORT_SYMBOL(hci_find_link_key_type);



int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key,

				bdaddr_t *bdaddr, u8 *val, u8 type, u8 pin_len)

{
@@ -1112,6 +1148,43 @@ int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key, 
	return 0;

}



int hci_add_ltk(struct hci_dev *hdev, int new_key, bdaddr_t *bdaddr,

					__le16 ediv, u8 rand[8], u8 ltk[16])

{

	struct link_key *key, *old_key;

	struct key_master_id *id;

	u8 old_key_type;



	BT_DBG("%s addr %s", hdev->name, batostr(bdaddr));



	old_key = hci_find_link_key_type(hdev, bdaddr, HCI_LK_SMP_LTK);

	if (old_key) {

		key = old_key;

		old_key_type = old_key->type;

	} else {

		key = kzalloc(sizeof(*key) + sizeof(*id), GFP_ATOMIC);

		if (!key)

			return -ENOMEM;

		list_add(&key->list, &hdev->link_keys);

		old_key_type = 0xff;

	}



	key->dlen = sizeof(*id);



	bacpy(&key->bdaddr, bdaddr);

	memcpy(key->val, ltk, sizeof(key->val));

	key->type = HCI_LK_SMP_LTK;



	id = (void *) &key->data;

	id->ediv = ediv;

	memcpy(id->rand, rand, sizeof(id->rand));



	if (new_key)

		mgmt_new_key(hdev->id, key, old_key_type);



	return 0;

}



int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)

{

	struct link_key *key;

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