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Bluetooth: Add logic for UUID filter handling

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The previous patch provided the framework for integrating the UUID
filtering into the service discovery. This patch now provides the
actual filter logic.

Signed-off-by: Jakub Pawlowski <jpawlowski@google.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Jakub Pawlowski 2014-12-05 10:55:58 +01:00 committed by Johan Hedberg
parent b487b9ce93
commit 799ce93df0
1 changed files with 70 additions and 0 deletions
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70
net/bluetooth/mgmt.c
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@ -6802,8 +6802,78 @@ void mgmt_read_local_oob_data_complete(struct hci_dev *hdev, u8 *hash192,
mgmt_pending_remove(cmd);
}
/* this is reversed hex representation of bluetooth base uuid. We need it for
* service uuid parsing in eir.
*/
static const u8 reverse_base_uuid[] = {
0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80,
0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static inline bool has_uuid(u8 *uuid, u16 uuid_count, u8 (*uuids)[16])
{
int i;
for (i = 0; i < uuid_count; i++) {
if (!memcmp(uuid, uuids[i], 16))
return true;
}
return false;
}
static bool eir_has_uuids(u8 *eir, u16 eir_len, u16 uuid_count, u8 (*uuids)[16])
{
u16 parsed = 0;
while (parsed < eir_len) {
u8 field_len = eir[0];
u8 uuid[16];
int i;
if (field_len == 0)
break;
if (eir_len - parsed < field_len + 1)
break;
switch (eir[1]) {
case EIR_UUID16_ALL:
case EIR_UUID16_SOME:
for (i = 0; i + 3 <= field_len; i += 2) {
memcpy(uuid, reverse_base_uuid, 16);
uuid[13] = eir[i + 3];
uuid[12] = eir[i + 2];
if (has_uuid(uuid, uuid_count, uuids))
return true;
}
break;
case EIR_UUID32_ALL:
case EIR_UUID32_SOME:
for (i = 0; i + 5 <= field_len; i += 4) {
memcpy(uuid, reverse_base_uuid, 16);
uuid[15] = eir[i + 5];
uuid[14] = eir[i + 4];
uuid[13] = eir[i + 3];
uuid[12] = eir[i + 2];
if (has_uuid(uuid, uuid_count, uuids))
return true;
}
break;
case EIR_UUID128_ALL:
case EIR_UUID128_SOME:
for (i = 0; i + 17 <= field_len; i += 16) {
memcpy(uuid, eir + i + 2, 16);
if (has_uuid(uuid, uuid_count, uuids))
return true;
}
break;
}
parsed += field_len + 1;
eir += field_len + 1;
}
return false;
}