Bluetooth: Add local Extended Inquiry Response (EIR) support

This patch adds automated creation of the local EIR data based on what
16-bit UUIDs are registered and what the device name is. This should
cover the majority use cases, however things like 32/128-bit UUIDs, TX
power and Device ID will need to be added later to be on par with what
bluetoothd is capable of doing (without the Management interface).

Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 163 insertions, 0 deletions

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index a42dc8ca0a6f..62055c9a8084 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -544,6 +544,150 @@ failed:
         return err;
 }
 
+#define EIR_FLAGS               0x01 /* flags */
+#define EIR_UUID16_SOME         0x02 /* 16-bit UUID, more available */
+#define EIR_UUID16_ALL          0x03 /* 16-bit UUID, all listed */
+#define EIR_UUID32_SOME         0x04 /* 32-bit UUID, more available */
+#define EIR_UUID32_ALL          0x05 /* 32-bit UUID, all listed */
+#define EIR_UUID128_SOME        0x06 /* 128-bit UUID, more available */
+#define EIR_UUID128_ALL         0x07 /* 128-bit UUID, all listed */
+#define EIR_NAME_SHORT          0x08 /* shortened local name */
+#define EIR_NAME_COMPLETE       0x09 /* complete local name */
+#define EIR_TX_POWER            0x0A /* transmit power level */
+#define EIR_DEVICE_ID           0x10 /* device ID */
+
+#define PNP_INFO_SVCLASS_ID             0x1200
+
+static u8 bluetooth_base_uuid[] = {
+                        0xFB, 0x34, 0x9B, 0x5F, 0x80, 0x00, 0x00, 0x80,
+                        0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static u16 get_uuid16(u8 *uuid128)
+{
+        u32 val;
+        int i;
+
+        for (i = 0; i < 12; i++) {
+                if (bluetooth_base_uuid[i] != uuid128[i])
+                        return 0;
+        }
+
+        memcpy(&val, &uuid128[12], 4);
+
+        val = le32_to_cpu(val);
+        if (val > 0xffff)
+                return 0;
+
+        return (u16) val;
+}
+
+static void create_eir(struct hci_dev *hdev, u8 *data)
+{
+        u8 *ptr = data;
+        u16 eir_len = 0;
+        u16 uuid16_list[HCI_MAX_EIR_LENGTH / sizeof(u16)];
+        int i, truncated = 0;
+        struct list_head *p;
+        size_t name_len;
+
+        name_len = strlen(hdev->dev_name);
+
+        if (name_len > 0) {
+                /* EIR Data type */
+                if (name_len > 48) {
+                        name_len = 48;
+                        ptr[1] = EIR_NAME_SHORT;
+                } else
+                        ptr[1] = EIR_NAME_COMPLETE;
+
+                /* EIR Data length */
+                ptr[0] = name_len + 1;
+
+                memcpy(ptr + 2, hdev->dev_name, name_len);
+
+                eir_len += (name_len + 2);
+                ptr += (name_len + 2);
+        }
+
+        memset(uuid16_list, 0, sizeof(uuid16_list));
+
+        /* Group all UUID16 types */
+        list_for_each(p, &hdev->uuids) {
+                struct bt_uuid *uuid = list_entry(p, struct bt_uuid, list);
+                u16 uuid16;
+
+                uuid16 = get_uuid16(uuid->uuid);
+                if (uuid16 == 0)
+                        return;
+
+                if (uuid16 < 0x1100)
+                        continue;
+
+                if (uuid16 == PNP_INFO_SVCLASS_ID)
+                        continue;
+
+                /* Stop if not enough space to put next UUID */
+                if (eir_len + 2 + sizeof(u16) > HCI_MAX_EIR_LENGTH) {
+                        truncated = 1;
+                        break;
+                }
+
+                /* Check for duplicates */
+                for (i = 0; uuid16_list[i] != 0; i++)
+                        if (uuid16_list[i] == uuid16)
+                                break;
+
+                if (uuid16_list[i] == 0) {
+                        uuid16_list[i] = uuid16;
+                        eir_len += sizeof(u16);
+                }
+        }
+
+        if (uuid16_list[0] != 0) {
+                u8 *length = ptr;
+
+                /* EIR Data type */
+                ptr[1] = truncated ? EIR_UUID16_SOME : EIR_UUID16_ALL;
+
+                ptr += 2;
+                eir_len += 2;
+
+                for (i = 0; uuid16_list[i] != 0; i++) {
+                        *ptr++ = (uuid16_list[i] & 0x00ff);
+                        *ptr++ = (uuid16_list[i] & 0xff00) >> 8;
+                }
+
+                /* EIR Data length */
+                *length = (i * sizeof(u16)) + 1;
+        }
+}
+
+static int update_eir(struct hci_dev *hdev)
+{
+        struct hci_cp_write_eir cp;
+
+        if (!(hdev->features[6] & LMP_EXT_INQ))
+                return 0;
+
+        if (hdev->ssp_mode == 0)
+                return 0;
+
+        if (test_bit(HCI_SERVICE_CACHE, &hdev->flags))
+                return 0;
+
+        memset(&cp, 0, sizeof(cp));
+
+        create_eir(hdev, cp.data);
+
+        if (memcmp(cp.data, hdev->eir, sizeof(cp.data)) == 0)
+                return 0;
+
+        memcpy(hdev->eir, cp.data, sizeof(cp.data));
+
+        return hci_send_cmd(hdev, HCI_OP_WRITE_EIR, sizeof(cp), &cp);
+}
+
 static u8 get_service_classes(struct hci_dev *hdev)
 {
         struct list_head *p;
@@ -612,6 +756,10 @@ static int add_uuid(struct sock *sk, u16 index, unsigned char *data, u16 len)
         if (err < 0)
                 goto failed;
 
+        err = update_eir(hdev);
+        if (err < 0)
+                goto failed;
+
         err = cmd_complete(sk, index, MGMT_OP_ADD_UUID, NULL, 0);
 
 failed:
@@ -668,6 +816,10 @@ static int remove_uuid(struct sock *sk, u16 index, unsigned char *data, u16 len)
         if (err < 0)
                 goto unlock;
 
+        err = update_eir(hdev);
+        if (err < 0)
+                goto unlock;
+
         err = cmd_complete(sk, index, MGMT_OP_REMOVE_UUID, NULL, 0);
 
 unlock:
@@ -737,6 +889,8 @@ static int set_service_cache(struct sock *sk, u16 index,  unsigned char *data,
         } else {
                 clear_bit(HCI_SERVICE_CACHE, &hdev->flags);
                 err = update_class(hdev);
+                if (err == 0)
+                        err = update_eir(hdev);
         }
 
         if (err == 0)
@@ -1822,6 +1976,7 @@ int mgmt_auth_failed(u16 index, bdaddr_t *bdaddr, u8 status)
 int mgmt_set_local_name_complete(u16 index, u8 *name, u8 status)
 {
         struct pending_cmd *cmd;
+        struct hci_dev *hdev;
         struct mgmt_cp_set_local_name ev;
         int err;
 
@@ -1837,6 +1992,14 @@ int mgmt_set_local_name_complete(u16 index, u8 *name, u8 status)
                 goto failed;
         }
 
+        hdev = hci_dev_get(index);
+        if (hdev) {
+                hci_dev_lock_bh(hdev);
+                update_eir(hdev);
+                hci_dev_unlock_bh(hdev);
+                hci_dev_put(hdev);
+        }
+
         err = cmd_complete(cmd->sk, index, MGMT_OP_SET_LOCAL_NAME, &ev,
                                                                 sizeof(ev));
         if (err < 0)