Merge "Add Android information service to send API level" into main

8 files changed, 224 insertions, 2 deletions

diff --git a/system/btif/src/stack_manager.cc b/system/btif/src/stack_manager.cc
index 3af74062d6..61099d65d8 100644
--- a/system/btif/src/stack_manager.cc
+++ b/system/btif/src/stack_manager.cc
@@ -63,6 +63,7 @@
 #include "internal_include/stack_config.h"
 #include "rust/src/core/ffi/module.h"
 #include "stack/btm/btm_ble_int.h"
+#include "stack/include/ais_api.h"
 #include "stack/include/smp_api.h"
 
 #ifndef BT_STACK_CLEANUP_WAIT_MS
@@ -301,6 +302,7 @@ static void event_start_up_stack(bluetooth::core::CoreInterface* interface,
 
   RFCOMM_Init();
   GAP_Init();
+  AIS_Init();
 
   startProfiles();
 
diff --git a/system/stack/Android.bp b/system/stack/Android.bp
index 1d6376c90d..d6c88e0dfa 100644
--- a/system/stack/Android.bp
+++ b/system/stack/Android.bp
@@ -38,6 +38,7 @@ cc_library_static {
     name: "libbt-stack",
     defaults: ["fluoride_defaults"],
     local_include_dirs: [
+        "ais",
         "avct",
         "avdt",
         "avrc",
@@ -180,6 +181,7 @@ cc_library_static {
     name: "libbt-stack-core",
     defaults: ["fluoride_defaults"],
     local_include_dirs: [
+        "ais",
         "avct",
         "avdt",
         "avrc",
@@ -213,6 +215,7 @@ cc_library_static {
         "acl/ble_acl.cc",
         "acl/btm_acl.cc",
         "acl/btm_pm.cc",
+        "ais/ais_ble.cc",
         "arbiter/acl_arbiter.cc",
         "btm/ble_scanner_hci_interface.cc",
         "btm/btm_ble.cc",
@@ -517,6 +520,7 @@ cc_fuzz {
         ":TestMockStackL2cap",
         ":TestMockStackMetrics",
         ":TestMockStackSdp",
+        "ais/*.cc",
         "eatt/*.cc",
         "fuzzers/gatt_fuzzer.cc",
         "gatt/*.cc",
@@ -1973,6 +1977,7 @@ cc_test {
         ":TestMockStackL2cap",
         ":TestMockStackSdp",
         ":TestMockStackSmp",
+        "ais/ais_ble.cc",
         "arbiter/acl_arbiter.cc",
         "eatt/eatt.cc",
         "gatt/att_protocol.cc",
diff --git a/system/stack/BUILD.gn b/system/stack/BUILD.gn
index 2581035379..68d5136db0 100644
--- a/system/stack/BUILD.gn
+++ b/system/stack/BUILD.gn
@@ -53,6 +53,7 @@ source_set("nonstandard_codecs") {
 
 source_set("stack") {
   sources = [
+    "ais/ais_ble.cc",
     "a2dp/a2dp_api.cc",
     "a2dp/a2dp_codec_config.cc",
     "a2dp/a2dp_ext.cc",
@@ -187,6 +188,7 @@ source_set("stack") {
   include_dirs = [
     ".",
     "include",
+    "ais",
     "avct",
     "btm",
     "avrc",
diff --git a/system/stack/ais/ais_ble.cc b/system/stack/ais/ais_ble.cc
new file mode 100644
index 0000000000..f545fc7981
--- /dev/null
+++ b/system/stack/ais/ais_ble.cc
@@ -0,0 +1,144 @@
+/******************************************************************************
+ *
+ *  Copyright 2024 The Android Open Source Project
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at:
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ******************************************************************************/
+
+#include <bluetooth/log.h>
+#include <com_android_bluetooth_flags.h>
+#include <string.h>
+
+#include <array>
+
+#include "os/system_properties.h"
+#include "stack/include/ais_api.h"
+#include "stack/include/bt_types.h"
+#include "stack/include/gatt_api.h"
+#include "types/bluetooth/uuid.h"
+
+using bluetooth::Uuid;
+using bluetooth::log::error;
+using bluetooth::log::warn;
+
+static const char kPropertyAndroidAPILevel[] = "ro.build.version.sdk";
+static const uint32_t kPropertyAndroidAPILevelDefault = 0;
+
+const Uuid ANDROID_INFORMATION_SERVICE_UUID =
+        Uuid::FromString(ANDROID_INFORMATION_SERVICE_UUID_STRING);
+const Uuid GATT_UUID_AIS_API_LEVEL = Uuid::FromString(GATT_UUID_AIS_API_LEVEL_STRING);
+
+/* LE AIS attribute handle */
+static uint16_t attr_api_level_handle;
+
+static uint32_t api_level;
+
+void ais_request_cback(uint16_t, uint32_t, tGATTS_REQ_TYPE, tGATTS_DATA*);
+
+static tGATT_CBACK ais_cback = {
+        .p_conn_cb = nullptr,
+        .p_cmpl_cb = nullptr,
+        .p_disc_res_cb = nullptr,
+        .p_disc_cmpl_cb = nullptr,
+        .p_req_cb = ais_request_cback,
+        .p_enc_cmpl_cb = nullptr,
+        .p_congestion_cb = nullptr,
+        .p_phy_update_cb = nullptr,
+        .p_conn_update_cb = nullptr,
+        .p_subrate_chg_cb = nullptr,
+};
+
+/** AIS ATT server attribute access request callback */
+void ais_request_cback(uint16_t conn_id, uint32_t trans_id, tGATTS_REQ_TYPE type,
+                       tGATTS_DATA* p_data) {
+  tGATT_STATUS status = GATT_INVALID_PDU;
+  tGATTS_RSP rsp_msg = {};
+  uint16_t handle = p_data->read_req.handle;
+  tGATT_VALUE* p_value = &rsp_msg.attr_value;
+  uint8_t* p = p_value->value;
+
+  if (type == GATTS_REQ_TYPE_READ_CHARACTERISTIC) {
+    p_value->handle = handle;
+
+    if (handle == attr_api_level_handle) {
+      if (p_data->read_req.is_long) {
+        p_value->offset = p_data->read_req.offset;
+        status = GATT_NOT_LONG;
+      } else {
+        UINT32_TO_STREAM(p, api_level);
+        p_value->len = 4;
+        status = GATT_SUCCESS;
+      }
+    } else {
+      status = GATT_NOT_FOUND;
+    }
+  } else {
+    warn("Unknown/unexpected LE AIS ATT request: 0x{:02x}", type);
+  }
+
+  if (GATTS_SendRsp(conn_id, trans_id, status, &rsp_msg) != GATT_SUCCESS) {
+    warn("Unable to send GATT server response conn_id:{}", conn_id);
+  }
+}
+
+/*******************************************************************************
+ *
+ * Function         ais_attr_db_init
+ *
+ * Description      AIS ATT database initialization.
+ *
+ * Returns          void.
+ *
+ ******************************************************************************/
+void ais_attr_db_init(void) {
+  if (!com::android::bluetooth::flags::android_os_identifier()) {
+    return;
+  }
+  api_level = bluetooth::os::GetSystemPropertyUint32(kPropertyAndroidAPILevel,
+                                                     kPropertyAndroidAPILevelDefault);
+  // Add Android OS identifier if API level is defined.
+  if (api_level != kPropertyAndroidAPILevelDefault) {
+    std::array<uint8_t, Uuid::kNumBytes128> tmp;
+    tmp.fill(0xc5);  // any number is fine here
+    Uuid app_uuid = Uuid::From128BitBE(tmp);
+
+    tGATT_IF gatt_if = GATT_Register(app_uuid, "Ais", &ais_cback, false);
+
+    GATT_StartIf(gatt_if);
+
+    btgatt_db_element_t android_information_service[] = {
+            {
+                    .uuid = ANDROID_INFORMATION_SERVICE_UUID,
+                    .type = BTGATT_DB_PRIMARY_SERVICE,
+            },
+            {
+                    .uuid = GATT_UUID_AIS_API_LEVEL,
+                    .type = BTGATT_DB_CHARACTERISTIC,
+                    .properties = GATT_CHAR_PROP_BIT_READ,
+                    .permissions = GATT_PERM_READ_IF_ENCRYPTED_OR_DISCOVERABLE,
+            }};
+    if (GATTS_AddService(gatt_if, android_information_service,
+                         sizeof(android_information_service) / sizeof(btgatt_db_element_t)) !=
+        GATT_SERVICE_STARTED) {
+      error("Unable to add Android Information Server gatt_if:{}", gatt_if);
+    }
+
+    attr_api_level_handle = android_information_service[1].attribute_handle;
+  }
+}
+
+/*
+ * This routine should not be called except once per stack invocation.
+ */
+void AIS_Init(void) { ais_attr_db_init(); }
diff --git a/system/stack/fuzzers/gatt_fuzzer.cc b/system/stack/fuzzers/gatt_fuzzer.cc
index a98f674e72..409e62c1da 100644
--- a/system/stack/fuzzers/gatt_fuzzer.cc
+++ b/system/stack/fuzzers/gatt_fuzzer.cc
@@ -49,6 +49,9 @@ namespace os {
 bool GetSystemPropertyBool(const std::string& property, bool default_value) {
   return default_value;
 }
+uint32_t GetSystemPropertyUint32(const std::string& property, uint32_t default_value) {
+  return default_value;
+}
 }  // namespace os
 }  // namespace bluetooth
 
diff --git a/system/stack/gatt/gatt_api.cc b/system/stack/gatt/gatt_api.cc
index c6ea0cf5b0..dff5e42974 100644
--- a/system/stack/gatt/gatt_api.cc
+++ b/system/stack/gatt/gatt_api.cc
@@ -41,6 +41,7 @@
 #include "stack/btm/btm_dev.h"
 #include "stack/gatt/connection_manager.h"
 #include "stack/gatt/gatt_int.h"
+#include "stack/include/ais_api.h"
 #include "stack/include/bt_hdr.h"
 #include "stack/include/bt_uuid16.h"
 #include "stack/include/l2cap_acl_interface.h"
@@ -323,8 +324,10 @@ tGATT_STATUS GATTS_AddService(tGATT_IF gatt_if, btgatt_db_element_t* service, in
     Uuid* p_uuid = gatts_get_service_uuid(elem.p_db);
     if (*p_uuid != Uuid::From16Bit(UUID_SERVCLASS_GMCS_SERVER) &&
         *p_uuid != Uuid::From16Bit(UUID_SERVCLASS_GTBS_SERVER)) {
-      if (com::android::bluetooth::flags::channel_sounding_in_stack() &&
-          *p_uuid == Uuid::From16Bit(UUID_SERVCLASS_RAS)) {
+      if ((com::android::bluetooth::flags::channel_sounding_in_stack() &&
+           *p_uuid == Uuid::From16Bit(UUID_SERVCLASS_RAS)) ||
+          (com::android::bluetooth::flags::android_os_identifier() &&
+           *p_uuid == ANDROID_INFORMATION_SERVICE_UUID)) {
         elem.sdp_handle = 0;
       } else {
         elem.sdp_handle = gatt_add_sdp_record(*p_uuid, elem.s_hdl, elem.e_hdl);
diff --git a/system/stack/include/ais_api.h b/system/stack/include/ais_api.h
new file mode 100644
index 0000000000..41dad8242b
--- /dev/null
+++ b/system/stack/include/ais_api.h
@@ -0,0 +1,43 @@
+/******************************************************************************
+ *
+ *  Copyright 2024 The Android Open Source Project
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at:
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ******************************************************************************/
+#ifndef SYSTEM_STACK_INCLUDE_AIS_API_H_
+#define SYSTEM_STACK_INCLUDE_AIS_API_H_
+
+#include "types/bluetooth/uuid.h"
+
+#define ANDROID_INFORMATION_SERVICE_UUID_STRING "e73e0001-ef1b-4e74-8291-2e4f3164f3b5"
+/* Android Information Service characteristic */
+#define GATT_UUID_AIS_API_LEVEL_STRING "e73e0002-ef1b-4e74-8291-2e4f3164f3b5"
+
+extern const bluetooth::Uuid ANDROID_INFORMATION_SERVICE_UUID;
+extern const bluetooth::Uuid GATT_UUID_AIS_API_LEVEL;
+
+/*******************************************************************************
+ *
+ * Function         AIS_Init
+ *
+ * Description      Initializes the control blocks used by AIS.
+ *                  This routine should not be called except once per
+ *                      stack invocation.
+ *
+ * Returns          Nothing
+ *
+ ******************************************************************************/
+void AIS_Init(void);
+
+#endif  // SYSTEM_STACK_INCLUDE_AIS_API_H_
diff --git a/system/test/mock/mock_stack_ais_ble.cc b/system/test/mock/mock_stack_ais_ble.cc
new file mode 100644
index 0000000000..29630207b4
--- /dev/null
+++ b/system/test/mock/mock_stack_ais_ble.cc
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "stack/include/ais_api.h"
+#include "test/common/mock_functions.h"
+
+void AIS_Init(void) { inc_func_call_count(__func__); }