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Bluetooth: Add a flag to indicate that SMP is going on

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Add HCI_CONN_LE_SMP_PEND flag to indicate that SMP is pending
for that connection. This allows to have information that an SMP
procedure is going on for that connection.

We use the HCI_CONN_ENCRYPT_PEND to indicate that encryption
(HCI_LE_Start_Encryption) is pending for that connection.

While a SMP procedure is going on we hold an reference to the
connection, to avoid disconnections.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Vinicius Costa Gomes 2011-08-19 21:06:51 -03:00 committed by Gustavo F. Padovan
parent e2dcd113d1
commit d26a234548
3 changed files with 38 additions and 11 deletions
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1
include/net/bluetooth/hci_core.h
View file

@ -348,6 +348,7 @@ enum {
HCI_CONN_RSWITCH_PEND,
HCI_CONN_MODE_CHANGE_PEND,
HCI_CONN_SCO_SETUP_PEND,
HCI_CONN_LE_SMP_PEND,
};
static inline void hci_conn_hash_init(struct hci_dev *hdev)

4
net/bluetooth/l2cap_core.c
View file

@ -986,8 +986,10 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err)
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
del_timer_sync(&conn->info_timer);
if (test_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend))
if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) {
del_timer(&conn->security_timer);
hci_conn_put(hcon);
}
hcon->l2cap_data = NULL;
kfree(conn);

44
net/bluetooth/smp.c
View file

@ -248,6 +248,9 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
BT_DBG("conn %p", conn);
if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend))
hci_conn_hold(conn->hcon);
conn->preq[0] = SMP_CMD_PAIRING_REQ;
memcpy(&conn->preq[1], req, sizeof(*req));
skb_pull(skb, sizeof(*req));
@ -397,6 +400,9 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
memset(stk + conn->smp_key_size, 0,
SMP_MAX_ENC_KEY_SIZE - conn->smp_key_size);
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend))
return SMP_UNSPECIFIED;
hci_le_start_enc(hcon, ediv, rand, stk);
hcon->enc_key_size = conn->smp_key_size;
} else {
@ -430,9 +436,11 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
BT_DBG("conn %p", conn);
if (test_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend))
if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
return 0;
hci_conn_hold(hcon);
skb_pull(skb, sizeof(*rp));
memset(&cp, 0, sizeof(cp));
@ -443,8 +451,6 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend);
return 0;
}
@ -461,19 +467,13 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
if (IS_ERR(hcon->hdev->tfm))
return 1;
if (test_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend))
return 0;
if (sec_level == BT_SECURITY_LOW)
return 1;
if (hcon->sec_level >= sec_level)
return 1;
authreq = seclevel_to_authreq(sec_level);
if (hcon->link_mode & HCI_LM_MASTER) {
struct smp_cmd_pairing cp;
struct link_key *key;
key = hci_find_link_key_type(hcon->hdev, conn->dst,
@ -481,12 +481,28 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
if (key) {
struct key_master_id *master = (void *) key->data;
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND,
&hcon->pend))
goto done;
hci_le_start_enc(hcon, master->ediv, master->rand,
key->val);
hcon->enc_key_size = key->pin_len;
goto done;
}
}
if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
return 0;
/* While SMP is going on */
hci_conn_hold(hcon);
authreq = seclevel_to_authreq(sec_level);
if (hcon->link_mode & HCI_LM_MASTER) {
struct smp_cmd_pairing cp;
build_pairing_cmd(conn, &cp, NULL, authreq);
conn->preq[0] = SMP_CMD_PAIRING_REQ;
@ -501,7 +517,6 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
done:
hcon->pending_sec_level = sec_level;
set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend);
return 0;
}
@ -619,6 +634,9 @@ int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
if (IS_ERR(conn->hcon->hdev->tfm))
return PTR_ERR(conn->hcon->hdev->tfm);
if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend))
return 0;
rsp = (void *) &conn->prsp[1];
/* The responder sends its keys first */
@ -689,5 +707,11 @@ int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
*keydist &= ~SMP_DIST_SIGN;
}
if (conn->hcon->out || force) {
clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend);
del_timer(&conn->security_timer);
hci_conn_put(conn->hcon);
}
return 0;
}