Hi Spoorthi,
> As per Core specification 5.0, Vol 2, Part E, Section 7.8.38,
> following code changes implements LE add device to Resolving List.
> < HCI Command: LE Set Scan Pa.. (0x08|0x000b) plen 7 #3 [hci0] 06:08:22.083786
> Type: Active (0x01)
> Interval: 22.500 msec (0x0024)
> Window: 11.250 msec (0x0012)
> Own address type: Random (0x01)
> Filter policy: Accept all advertisement (0x00)
>> HCI Event: Command Complete (0x0e) plen 4 #4 [hci0] 06:08:22.084498
> LE Set Scan Parameters (0x08|0x000b) ncmd 1
> Status: Success (0x00)
> < HCI Command: LE Add Devic.. (0x08|0x0027) plen 39 #26 [hci0] 06:08:30.646867
> Address type: Random (0x01)
> Address: E8:E9:93:AD:7E:A2 (Static)
> Peer identity resolving key: 704baf18bc90ffffb83c2d40d2b0ffff
> Local identity resolving key: 8e4902a3ffffffff0040af18bc90ffff
>> HCI Event: Command Complete (0x0e) plen 4 #27 [hci0] 06:08:30.647408
> LE Add Device To Resolving List (0x08|0x0027) ncmd 1
> Status: Success (0x00)
> < HCI Command: LE Set Scan P.. (0x08|0x000b) plen 7 #28 [hci0] 06:08:30.647456
> Type: Passive (0x00)
> Interval: 60.000 msec (0x0060)
> Window: 30.000 msec (0x0030)
> Own address type: Public (0x00)
> Filter policy: Accept all advertisement, inc. directed unresolved RPA (0x02)
>> HCI Event: Command Complete (0x0e) plen 4 #29 [hci0] 06:08:30.648901
> LE Set Scan Parameters (0x08|0x000b) ncmd 1
> Status: Success (0x00)
> < HCI Command: LE Create Co.. (0x08|0x000d) plen 25 #43 [hci0] 06:08:31.142393
> Scan interval: 60.000 msec (0x0060)
> Scan window: 60.000 msec (0x0060)
> Filter policy: White list is not used (0x00)
>> HCI Event: Command Status (0x0f) plen 4 #44 [hci0] 06:08:31.144909
> LE Create Connection (0x08|0x000d) ncmd 2
> Status: Success (0x00)
> @ MGMT Command: Add Device (0x0033) plen 8 {0x0001} [hci0] 06:08:40.939043
> LE Address: E8:E9:93:AD:7E:A2 (Static)
> Action: Auto-connect remote device (0x02)
>
> Signed-off-by: Spoorthi Ravishankar Koppad <spoorthix.k@xxxxxxxxx>
> ---
> include/net/bluetooth/hci.h | 1 +
> net/bluetooth/hci_request.c | 119 +++++++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 119 insertions(+), 1 deletion(-)
>
> diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
> index c36dc1e..99a38cf36 100644
> --- a/include/net/bluetooth/hci.h
> +++ b/include/net/bluetooth/hci.h
> @@ -420,6 +420,7 @@ enum {
> #define HCI_LE_SLAVE_FEATURES 0x08
> #define HCI_LE_PING 0x10
> #define HCI_LE_DATA_LEN_EXT 0x20
> +#define HCI_LE_LL_PRIVACY 0x40
> #define HCI_LE_PHY_2M 0x01
> #define HCI_LE_PHY_CODED 0x08
> #define HCI_LE_EXT_ADV 0x10
> diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
> index ca73d36..d4ecf71 100644
> --- a/net/bluetooth/hci_request.c
> +++ b/net/bluetooth/hci_request.c
> @@ -773,6 +773,119 @@ static u8 update_white_list(struct hci_request *req)
> return 0x01;
> }
>
> +static void add_to_resolve_list(struct hci_request *req,
> + struct hci_conn_params *params)
> +{
> + struct hci_cp_le_add_to_resolv_list cp;
> + struct bdaddr_list_with_irk *entry;
> +
> + entry = kzalloc(sizeof(*entry), GFP_KERNEL);
> + if (!entry)
> + return;
> +
> + cp.bdaddr_type = params->addr_type;
> + bacpy(&cp.bdaddr, ¶ms->addr);
> + memcpy(entry->peer_irk, cp.peer_irk, 16);
> + memcpy(entry->local_irk, cp.local_irk, 16);
> + hci_req_add(req, HCI_OP_LE_ADD_TO_RESOLV_LIST, sizeof(cp), &cp);
> +}
> +
> +static u8 update_resolve_list(struct hci_request *req)
> +{
> + struct hci_dev *hdev = req->hdev;
> + struct hci_conn_params *params;
> + struct bdaddr_list *b;
> + uint8_t resolve_list_entries = 0;
> +
> + /* Go through the current white list programmed into the
> + * controller one by one and check if that address is still
> + * in the list of pending connections or list of devices to
> + * report. If not present in either list, then queue the
> + * command to remove it from the controller.
> + */
> + list_for_each_entry(b, &hdev->le_resolv_list, list) {
> + /* If the device is neither in pend_le_conns nor
> + * pend_le_reports then remove it from the whitelist.
> + */
> + if (!hci_pend_le_action_lookup(&hdev->pend_le_conns,
> + &b->bdaddr, b->bdaddr_type) &&
> + !hci_pend_le_action_lookup(&hdev->pend_le_reports,
> + &b->bdaddr, b->bdaddr_type)) {
> + struct hci_cp_le_del_from_resolv_list cp;
> +
> + cp.bdaddr_type = b->bdaddr_type;
> + bacpy(&cp.bdaddr, &b->bdaddr);
> +
> + hci_req_add(req, HCI_OP_LE_DEL_FROM_RESOLV_LIST,
> + sizeof(cp), &cp);
> + continue;
> + }
> +
> + if (hci_find_irk_by_addr(hdev, &b->bdaddr, b->bdaddr_type)) {
> + /* White list can not be used with RPAs */
> + return 0x00;
> + }
> +
> + resolve_list_entries++;
> + }
> +
> + /* Since all no longer valid white list entries have been
> + * removed, walk through the list of pending connections
> + * and ensure that any new device gets programmed into
> + * the controller.
> + *
> + * If the list of the devices is larger than the list of
> + * available white list entries in the controller, then
> + * just abort and return filer policy value to not use the
> + * white list.
> + */
> + list_for_each_entry(params, &hdev->pend_le_conns, action) {
> + if (hci_bdaddr_list_lookup(&hdev->le_resolv_list,
> + ¶ms->addr, params->addr_type))
> + continue;
> +
> + if (resolve_list_entries >= hdev->le_resolv_list_size) {
> + /* Select filter policy to accept all advertising */
> + return 0x00;
> + }
> +
> + if (hci_find_irk_by_addr(hdev, ¶ms->addr,
> + params->addr_type)) {
> + /* White list can not be used with RPAs */
> + return 0x02;
> + }
> +
> + resolve_list_entries++;
> + add_to_resolve_list(req, params);
> + }
> +
> + /* After adding all new pending connections, walk through
> + * the list of pending reports and also add these to the
> + * white list if there is still space.
> + */
> + list_for_each_entry(params, &hdev->pend_le_reports, action) {
> + if (hci_bdaddr_list_lookup(&hdev->le_resolv_list,
> + ¶ms->addr, params->addr_type))
> + continue;
> +
> + if (resolve_list_entries >= hdev->le_resolv_list_size) {
> + /* Select filter policy to accept all advertising */
> + return 0x00;
> + }
> +
> + if (hci_find_irk_by_addr(hdev, ¶ms->addr,
> + params->addr_type)) {
> + /* White list can not be used with RPAs */
> + return 0x02;
> + }
> +
> + resolve_list_entries++;
> + add_to_resolve_list(req, params);
> + }
> + /* Select filter policy to use white list */
> + return 0x02;
> +}
> +
> static bool scan_use_rpa(struct hci_dev *hdev)
> {
> return hci_dev_test_flag(hdev, HCI_PRIVACY);
> @@ -876,7 +989,11 @@ void hci_req_add_le_passive_scan(struct hci_request *req)
> * happen before enabling scanning. The controller does
> * not allow white list modification while scanning.
> */
> - filter_policy = update_white_list(req);
> +
> + if (!(hdev->le_features[0] & HCI_LE_LL_PRIVACY))
> + filter_policy = update_white_list(req);
> + else
> + filter_policy = update_resolve_list(req);
this white list and resolving list are not one or the other. You can use both and disabling the white list is a pretty bad idea here.
Regards
Marcel
