1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define __BTSTACK_FILE__ "pb_gatt.c" 39 40 #include <stdlib.h> 41 #include <string.h> 42 #include "btstack_util.h" 43 #include "btstack_debug.h" 44 #include "btstack_event.h" 45 #include "mesh/pb_gatt.h" 46 #include "ble/gatt-service/mesh_provisioning_service_server.h" 47 #include "provisioning.h" 48 #include "ble/att_server.h" 49 50 /************** PB GATT Mesh Provisioning ********************/ 51 52 // share buffer for reassembly and segmentation - protocol is half-duplex 53 static union { 54 uint8_t reassembly_buffer[MESH_PROV_MAX_PROXY_PDU]; 55 uint8_t segmentation_buffer[MESH_PROV_MAX_PROXY_PDU]; 56 } sar_buffer; 57 58 static const uint8_t * proxy_pdu; 59 static uint16_t proxy_pdu_size; 60 61 static uint16_t reassembly_offset; 62 static uint16_t segmentation_offset; 63 static mesh_msg_sar_field_t segmentation_state; 64 static uint16_t pb_gatt_mtu; 65 66 static btstack_packet_handler_t pb_gatt_packet_handler; 67 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 68 69 static void pb_gatt_emit_pdu_sent(uint8_t status){ 70 uint8_t event[] = {HCI_EVENT_MESH_META, 2, MESH_SUBEVENT_PB_TRANSPORT_PDU_SENT, status}; 71 pb_gatt_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 72 } 73 74 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 75 UNUSED(channel); 76 UNUSED(size); 77 mesh_msg_sar_field_t msg_sar_field; 78 mesh_msg_type_t msg_type; 79 int pdu_segment_len; 80 int pos; 81 hci_con_handle_t con_handle; 82 83 switch (packet_type) { 84 case PROVISIONING_DATA_PACKET: 85 pos = 0; 86 // on provisioning PDU call packet handler with PROVISIONG_DATA type 87 msg_sar_field = packet[pos] >> 6; 88 msg_type = packet[pos] & 0x3F; 89 pos++; 90 if (msg_type != MESH_MSG_TYPE_PROVISIONING_PDU) return; 91 if (!pb_gatt_packet_handler) return; 92 93 pdu_segment_len = size - pos; 94 95 if (sizeof(sar_buffer.reassembly_buffer) - reassembly_offset < pdu_segment_len) { 96 log_error("sar buffer too small left %d, new to store %d", MESH_PROV_MAX_PROXY_PDU - reassembly_offset, pdu_segment_len); 97 break; 98 } 99 100 // update mtu if incoming packet is larger than default 101 if (size > (ATT_DEFAULT_MTU - 1)){ 102 log_info("Remote uses larger MTU, enable long PDUs"); 103 pb_gatt_mtu = att_server_get_mtu(channel); 104 } 105 106 switch (msg_sar_field){ 107 case MESH_MSG_SAR_FIELD_FIRST_SEGMENT: 108 memset(sar_buffer.reassembly_buffer, 0, sizeof(sar_buffer.reassembly_buffer)); 109 memcpy(sar_buffer.reassembly_buffer, packet+pos, pdu_segment_len); 110 reassembly_offset = pdu_segment_len; 111 return; 112 case MESH_MSG_SAR_FIELD_CONTINUE: 113 memcpy(sar_buffer.reassembly_buffer + reassembly_offset, packet+pos, pdu_segment_len); 114 reassembly_offset += pdu_segment_len; 115 return; 116 case MESH_MSG_SAR_FIELD_LAST_SEGMENT: 117 memcpy(sar_buffer.reassembly_buffer + reassembly_offset, packet+pos, pdu_segment_len); 118 reassembly_offset += pdu_segment_len; 119 // send to provisioning device 120 pb_gatt_packet_handler(PROVISIONING_DATA_PACKET, 0, sar_buffer.reassembly_buffer, reassembly_offset); 121 reassembly_offset = 0; 122 break; 123 case MESH_MSG_SAR_FIELD_COMPLETE_MSG: 124 // send to provisioning device 125 pb_gatt_packet_handler(PROVISIONING_DATA_PACKET, 0, packet+pos, pdu_segment_len); 126 break; 127 } 128 break; 129 130 case HCI_EVENT_PACKET: 131 switch (hci_event_packet_get_type(packet)) { 132 case HCI_EVENT_MESH_META: 133 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 134 case MESH_SUBEVENT_PB_TRANSPORT_LINK_OPEN: 135 case MESH_SUBEVENT_PB_TRANSPORT_LINK_CLOSED: 136 // Forward link open/close 137 pb_gatt_mtu = ATT_DEFAULT_MTU; 138 pb_gatt_packet_handler(HCI_EVENT_PACKET, 0, packet, size); 139 break; 140 case MESH_SUBEVENT_CAN_SEND_NOW: 141 con_handle = little_endian_read_16(packet, 3); 142 if (con_handle == HCI_CON_HANDLE_INVALID) return; 143 144 sar_buffer.segmentation_buffer[0] = (segmentation_state << 6) | MESH_MSG_TYPE_PROVISIONING_PDU; 145 pdu_segment_len = btstack_min(proxy_pdu_size - segmentation_offset, pb_gatt_mtu - 1); 146 memcpy(&sar_buffer.segmentation_buffer[1], &proxy_pdu[segmentation_offset], pdu_segment_len); 147 segmentation_offset += pdu_segment_len; 148 149 mesh_provisioning_service_server_send_proxy_pdu(con_handle, sar_buffer.segmentation_buffer, pdu_segment_len + 1); 150 151 switch (segmentation_state){ 152 case MESH_MSG_SAR_FIELD_COMPLETE_MSG: 153 case MESH_MSG_SAR_FIELD_LAST_SEGMENT: 154 pb_gatt_emit_pdu_sent(0); 155 break; 156 case MESH_MSG_SAR_FIELD_CONTINUE: 157 case MESH_MSG_SAR_FIELD_FIRST_SEGMENT: 158 if ((proxy_pdu_size - segmentation_offset) > (pb_gatt_mtu - 1)){ 159 segmentation_state = MESH_MSG_SAR_FIELD_CONTINUE; 160 } else { 161 segmentation_state = MESH_MSG_SAR_FIELD_LAST_SEGMENT; 162 } 163 mesh_provisioning_service_server_request_can_send_now(con_handle); 164 break; 165 } 166 break; 167 default: 168 break; 169 } 170 } 171 break; 172 default: 173 break; 174 } 175 } 176 177 /** 178 * Setup mesh provisioning service 179 * @param device_uuid 180 */ 181 void pb_gatt_init(void){ 182 // setup mesh provisioning service 183 mesh_provisioning_service_server_init(); 184 mesh_provisioning_service_server_register_packet_handler(packet_handler); 185 } 186 187 /** 188 * Register listener for Provisioning PDUs 189 */ 190 void pb_gatt_register_packet_handler(btstack_packet_handler_t _packet_handler){ 191 pb_gatt_packet_handler = _packet_handler; 192 } 193 194 /** 195 * Send pdu 196 * @param con_handle 197 * @param pdu 198 * @param pdu_size 199 */ 200 void pb_gatt_send_pdu(uint16_t con_handle, const uint8_t * pdu, uint16_t size){ 201 if (!pdu || size <= 0) return; 202 if (con_handle == HCI_CON_HANDLE_INVALID) return; 203 // store pdu, request to send 204 proxy_pdu = pdu; 205 proxy_pdu_size = size; 206 segmentation_offset = 0; 207 208 // check if segmentation is necessary 209 if (proxy_pdu_size > (pb_gatt_mtu - 1)){ 210 segmentation_state = MESH_MSG_SAR_FIELD_FIRST_SEGMENT; 211 } else { 212 segmentation_state = MESH_MSG_SAR_FIELD_COMPLETE_MSG; 213 } 214 mesh_provisioning_service_server_request_can_send_now(con_handle); 215 } 216 /** 217 * Close Link 218 * @param con_handle 219 * @param reason 0 = success, 1 = timeout, 2 = fail 220 */ 221 void pb_gatt_close_link(hci_con_handle_t con_handle, uint8_t reason){ 222 } 223 224 /** 225 * Setup Link with unprovisioned device 226 * @param device_uuid 227 * @returns con_handle or HCI_CON_HANDLE_INVALID 228 */ 229 uint16_t pb_gatt_create_link(const uint8_t * device_uuid){ 230 return HCI_CON_HANDLE_INVALID; 231 } 232