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Bluetooth: LE advertising cache

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This patch implements the LE advertising cache. It stores sensitive
information (bdaddr and bdaddr_type so far) gathered from LE
advertising report events.

Only advertising entries from connectables devices are added to the
cache.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Andre Guedes 2011-05-26 16:23:50 -03:00 committed by Gustavo F. Padovan
parent 57a56fd41b
commit 76c8686f88
2 changed files with 77 additions and 0 deletions
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13
include/net/bluetooth/hci_core.h
View File

@ -89,6 +89,12 @@ struct oob_data {
u8 randomizer[16];
};
struct adv_entry {
struct list_head list;
bdaddr_t bdaddr;
u8 bdaddr_type;
};
#define NUM_REASSEMBLY 4
struct hci_dev {
struct list_head list;
@ -181,6 +187,8 @@ struct hci_dev {
struct list_head remote_oob_data;
struct list_head adv_entries;
struct hci_dev_stats stat;
struct sk_buff_head driver_init;
@ -527,6 +535,11 @@ int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 *hash,
u8 *randomizer);
int hci_remove_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr);
int hci_adv_entries_clear(struct hci_dev *hdev);
struct adv_entry *hci_find_adv_entry(struct hci_dev *hdev, bdaddr_t *bdaddr);
int hci_add_adv_entry(struct hci_dev *hdev,
struct hci_ev_le_advertising_info *ev);
void hci_del_off_timer(struct hci_dev *hdev);
void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb);

64
net/bluetooth/hci_core.c
View File

@ -1202,6 +1202,67 @@ int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 *hash,
return 0;
}
int hci_adv_entries_clear(struct hci_dev *hdev)
{
struct adv_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &hdev->adv_entries, list) {
list_del(&entry->list);
kfree(entry);
}
BT_DBG("%s adv cache cleared", hdev->name);
return 0;
}
struct adv_entry *hci_find_adv_entry(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
struct adv_entry *entry;
list_for_each_entry(entry, &hdev->adv_entries, list)
if (bacmp(bdaddr, &entry->bdaddr) == 0)
return entry;
return NULL;
}
static inline int is_connectable_adv(u8 evt_type)
{
if (evt_type == ADV_IND || evt_type == ADV_DIRECT_IND)
return 1;
return 0;
}
int hci_add_adv_entry(struct hci_dev *hdev,
struct hci_ev_le_advertising_info *ev)
{
struct adv_entry *entry;
if (!is_connectable_adv(ev->evt_type))
return -EINVAL;
/* Only new entries should be added to adv_entries. So, if
* bdaddr was found, don't add it. */
if (hci_find_adv_entry(hdev, &ev->bdaddr))
return 0;
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (!entry)
return -ENOMEM;
bacpy(&entry->bdaddr, &ev->bdaddr);
entry->bdaddr_type = ev->bdaddr_type;
list_add(&entry->list, &hdev->adv_entries);
BT_DBG("%s adv entry added: address %s type %u", hdev->name,
batostr(&entry->bdaddr), entry->bdaddr_type);
return 0;
}
/* Register HCI device */
int hci_register_dev(struct hci_dev *hdev)
{
@ -1268,6 +1329,8 @@ int hci_register_dev(struct hci_dev *hdev)
INIT_LIST_HEAD(&hdev->remote_oob_data);
INIT_LIST_HEAD(&hdev->adv_entries);
INIT_WORK(&hdev->power_on, hci_power_on);
INIT_WORK(&hdev->power_off, hci_power_off);
setup_timer(&hdev->off_timer, hci_auto_off, (unsigned long) hdev);
@ -1348,6 +1411,7 @@ int hci_unregister_dev(struct hci_dev *hdev)
hci_uuids_clear(hdev);
hci_link_keys_clear(hdev);
hci_remote_oob_data_clear(hdev);
hci_adv_entries_clear(hdev);
hci_dev_unlock_bh(hdev);
__hci_dev_put(hdev);