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Bluetooth: Refactor connection request handling
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The conditions for accepting an incoming connections are already
non-trivial and will become more so once a white list is added. This
patch breaks up the checks for when to reject the request by creating a
helper function for it.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Johan Hedberg authored and Marcel Holtmann committed Jul 9, 2014
1 parent dee58c1 commit 70c4642
Showing 1 changed file with 60 additions and 52 deletions.
112 changes: 60 additions & 52 deletions net/bluetooth/hci_event.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2121,10 +2121,21 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
hci_conn_check_pending(hdev);
}

static void hci_reject_conn(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
struct hci_cp_reject_conn_req cp;

bacpy(&cp.bdaddr, bdaddr);
cp.reason = HCI_ERROR_REJ_BAD_ADDR;
hci_send_cmd(hdev, HCI_OP_REJECT_CONN_REQ, sizeof(cp), &cp);
}

static void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_ev_conn_request *ev = (void *) skb->data;
int mask = hdev->link_mode;
struct inquiry_entry *ie;
struct hci_conn *conn;
__u8 flags = 0;

BT_DBG("%s bdaddr %pMR type 0x%x", hdev->name, &ev->bdaddr,
Expand All @@ -2133,74 +2144,71 @@ static void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
mask |= hci_proto_connect_ind(hdev, &ev->bdaddr, ev->link_type,
&flags);

if ((mask & HCI_LM_ACCEPT) &&
!hci_bdaddr_list_lookup(&hdev->blacklist, &ev->bdaddr,
if (!(mask & HCI_LM_ACCEPT)) {
hci_reject_conn(hdev, &ev->bdaddr);
return;
}

if (!hci_bdaddr_list_lookup(&hdev->blacklist, &ev->bdaddr,
BDADDR_BREDR)) {
/* Connection accepted */
struct inquiry_entry *ie;
struct hci_conn *conn;
hci_reject_conn(hdev, &ev->bdaddr);
return;
}

hci_dev_lock(hdev);
/* Connection accepted */

ie = hci_inquiry_cache_lookup(hdev, &ev->bdaddr);
if (ie)
memcpy(ie->data.dev_class, ev->dev_class, 3);
hci_dev_lock(hdev);

conn = hci_conn_hash_lookup_ba(hdev, ev->link_type,
&ev->bdaddr);
ie = hci_inquiry_cache_lookup(hdev, &ev->bdaddr);
if (ie)
memcpy(ie->data.dev_class, ev->dev_class, 3);

conn = hci_conn_hash_lookup_ba(hdev, ev->link_type,
&ev->bdaddr);
if (!conn) {
conn = hci_conn_add(hdev, ev->link_type, &ev->bdaddr);
if (!conn) {
conn = hci_conn_add(hdev, ev->link_type, &ev->bdaddr);
if (!conn) {
BT_ERR("No memory for new connection");
hci_dev_unlock(hdev);
return;
}
BT_ERR("No memory for new connection");
hci_dev_unlock(hdev);
return;
}
}

memcpy(conn->dev_class, ev->dev_class, 3);
memcpy(conn->dev_class, ev->dev_class, 3);

hci_dev_unlock(hdev);
hci_dev_unlock(hdev);

if (ev->link_type == ACL_LINK ||
(!(flags & HCI_PROTO_DEFER) && !lmp_esco_capable(hdev))) {
struct hci_cp_accept_conn_req cp;
conn->state = BT_CONNECT;
if (ev->link_type == ACL_LINK ||
(!(flags & HCI_PROTO_DEFER) && !lmp_esco_capable(hdev))) {
struct hci_cp_accept_conn_req cp;
conn->state = BT_CONNECT;

bacpy(&cp.bdaddr, &ev->bdaddr);
bacpy(&cp.bdaddr, &ev->bdaddr);

if (lmp_rswitch_capable(hdev) && (mask & HCI_LM_MASTER))
cp.role = 0x00; /* Become master */
else
cp.role = 0x01; /* Remain slave */
if (lmp_rswitch_capable(hdev) && (mask & HCI_LM_MASTER))
cp.role = 0x00; /* Become master */
else
cp.role = 0x01; /* Remain slave */

hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp),
&cp);
} else if (!(flags & HCI_PROTO_DEFER)) {
struct hci_cp_accept_sync_conn_req cp;
conn->state = BT_CONNECT;
hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
} else if (!(flags & HCI_PROTO_DEFER)) {
struct hci_cp_accept_sync_conn_req cp;
conn->state = BT_CONNECT;

bacpy(&cp.bdaddr, &ev->bdaddr);
cp.pkt_type = cpu_to_le16(conn->pkt_type);
bacpy(&cp.bdaddr, &ev->bdaddr);
cp.pkt_type = cpu_to_le16(conn->pkt_type);

cp.tx_bandwidth = cpu_to_le32(0x00001f40);
cp.rx_bandwidth = cpu_to_le32(0x00001f40);
cp.max_latency = cpu_to_le16(0xffff);
cp.content_format = cpu_to_le16(hdev->voice_setting);
cp.retrans_effort = 0xff;
cp.tx_bandwidth = cpu_to_le32(0x00001f40);
cp.rx_bandwidth = cpu_to_le32(0x00001f40);
cp.max_latency = cpu_to_le16(0xffff);
cp.content_format = cpu_to_le16(hdev->voice_setting);
cp.retrans_effort = 0xff;

hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
sizeof(cp), &cp);
} else {
conn->state = BT_CONNECT2;
hci_proto_connect_cfm(conn, 0);
}
hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ, sizeof(cp),
&cp);
} else {
/* Connection rejected */
struct hci_cp_reject_conn_req cp;

bacpy(&cp.bdaddr, &ev->bdaddr);
cp.reason = HCI_ERROR_REJ_BAD_ADDR;
hci_send_cmd(hdev, HCI_OP_REJECT_CONN_REQ, sizeof(cp), &cp);
conn->state = BT_CONNECT2;
hci_proto_connect_cfm(conn, 0);
}
}

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