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 "mesh/pb_gatt.h" 41 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "ble/att_server.h" 46 #include "ble/gatt-service/mesh_provisioning_service_server.h" 47 48 #include "btstack_debug.h" 49 #include "btstack_event.h" 50 #include "btstack_util.h" 51 52 #include "mesh/provisioning.h" 53 54 /************** PB GATT Mesh Provisioning ********************/ 55 56 // share buffer for reassembly and segmentation - protocol is half-duplex 57 static union { 58 uint8_t reassembly_buffer[MESH_PROV_MAX_PROXY_PDU]; 59 uint8_t segmentation_buffer[MESH_PROV_MAX_PROXY_PDU]; 60 } sar_buffer; 61 62 static const uint8_t * proxy_pdu; 63 static uint16_t proxy_pdu_size; 64 65 static uint16_t reassembly_offset; 66 static uint16_t segmentation_offset; 67 static mesh_msg_sar_field_t segmentation_state; 68 static uint16_t pb_gatt_mtu; 69 70 static btstack_packet_handler_t pb_gatt_packet_handler; 71 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 72 73 static void pb_gatt_emit_pdu_sent(uint8_t status){ 74 uint8_t event[] = {HCI_EVENT_MESH_META, 2, MESH_SUBEVENT_PB_TRANSPORT_PDU_SENT, status}; 75 pb_gatt_packet_handler(HCI_EVENT_PACKET, 0, event, sizeof(event)); 76 } 77 78 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 79 UNUSED(channel); 80 UNUSED(size); 81 mesh_msg_sar_field_t msg_sar_field; 82 mesh_msg_type_t msg_type; 83 uint16_t pdu_segment_len; 84 uint16_t pos; 85 hci_con_handle_t con_handle; 86 87 switch (packet_type) { 88 case PROVISIONING_DATA_PACKET: 89 pos = 0; 90 // on provisioning PDU call packet handler with PROVISIONG_DATA type 91 msg_sar_field = packet[pos] >> 6; 92 msg_type = packet[pos] & 0x3F; 93 pos++; 94 if (msg_type != MESH_MSG_TYPE_PROVISIONING_PDU) return; 95 if (!pb_gatt_packet_handler) return; 96 97 pdu_segment_len = size - pos; 98 99 if (sizeof(sar_buffer.reassembly_buffer) - reassembly_offset < pdu_segment_len) { 100 log_error("sar buffer too small left %d, new to store %d", MESH_PROV_MAX_PROXY_PDU - reassembly_offset, pdu_segment_len); 101 break; 102 } 103 104 // update mtu if incoming packet is larger than default 105 if (size > (ATT_DEFAULT_MTU - 1)){ 106 log_info("Remote uses larger MTU, enable long PDUs"); 107 pb_gatt_mtu = att_server_get_mtu(channel); 108 } 109 110 switch (msg_sar_field){ 111 case MESH_MSG_SAR_FIELD_FIRST_SEGMENT: 112 memset(sar_buffer.reassembly_buffer, 0, sizeof(sar_buffer.reassembly_buffer)); 113 memcpy(sar_buffer.reassembly_buffer, packet+pos, pdu_segment_len); 114 reassembly_offset = pdu_segment_len; 115 return; 116 case MESH_MSG_SAR_FIELD_CONTINUE: 117 memcpy(sar_buffer.reassembly_buffer + reassembly_offset, packet+pos, pdu_segment_len); 118 reassembly_offset += pdu_segment_len; 119 return; 120 case MESH_MSG_SAR_FIELD_LAST_SEGMENT: 121 memcpy(sar_buffer.reassembly_buffer + reassembly_offset, packet+pos, pdu_segment_len); 122 reassembly_offset += pdu_segment_len; 123 // send to provisioning device 124 pb_gatt_packet_handler(PROVISIONING_DATA_PACKET, 0, sar_buffer.reassembly_buffer, reassembly_offset); 125 reassembly_offset = 0; 126 break; 127 case MESH_MSG_SAR_FIELD_COMPLETE_MSG: 128 // send to provisioning device 129 pb_gatt_packet_handler(PROVISIONING_DATA_PACKET, 0, packet+pos, pdu_segment_len); 130 break; 131 } 132 break; 133 134 case HCI_EVENT_PACKET: 135 switch (hci_event_packet_get_type(packet)) { 136 case HCI_EVENT_MESH_META: 137 switch (hci_event_mesh_meta_get_subevent_code(packet)){ 138 case MESH_SUBEVENT_PB_TRANSPORT_LINK_OPEN: 139 case MESH_SUBEVENT_PB_TRANSPORT_LINK_CLOSED: 140 // Forward link open/close 141 pb_gatt_mtu = ATT_DEFAULT_MTU; 142 pb_gatt_packet_handler(HCI_EVENT_PACKET, 0, packet, size); 143 break; 144 case MESH_SUBEVENT_CAN_SEND_NOW: 145 con_handle = little_endian_read_16(packet, 3); 146 if (con_handle == HCI_CON_HANDLE_INVALID) return; 147 148 sar_buffer.segmentation_buffer[0] = (segmentation_state << 6) | MESH_MSG_TYPE_PROVISIONING_PDU; 149 pdu_segment_len = btstack_min(proxy_pdu_size - segmentation_offset, pb_gatt_mtu - 1); 150 memcpy(&sar_buffer.segmentation_buffer[1], &proxy_pdu[segmentation_offset], pdu_segment_len); 151 segmentation_offset += pdu_segment_len; 152 153 mesh_provisioning_service_server_send_proxy_pdu(con_handle, sar_buffer.segmentation_buffer, pdu_segment_len + 1); 154 155 switch (segmentation_state){ 156 case MESH_MSG_SAR_FIELD_COMPLETE_MSG: 157 case MESH_MSG_SAR_FIELD_LAST_SEGMENT: 158 pb_gatt_emit_pdu_sent(0); 159 break; 160 case MESH_MSG_SAR_FIELD_CONTINUE: 161 case MESH_MSG_SAR_FIELD_FIRST_SEGMENT: 162 if ((proxy_pdu_size - segmentation_offset) > (pb_gatt_mtu - 1)){ 163 segmentation_state = MESH_MSG_SAR_FIELD_CONTINUE; 164 } else { 165 segmentation_state = MESH_MSG_SAR_FIELD_LAST_SEGMENT; 166 } 167 mesh_provisioning_service_server_request_can_send_now(con_handle); 168 break; 169 } 170 break; 171 default: 172 break; 173 } 174 } 175 break; 176 default: 177 break; 178 } 179 } 180 181 /** 182 * Setup mesh provisioning service 183 * @param device_uuid 184 */ 185 void pb_gatt_init(void){ 186 // setup mesh provisioning service 187 mesh_provisioning_service_server_init(); 188 mesh_provisioning_service_server_register_packet_handler(packet_handler); 189 } 190 191 /** 192 * Register listener for Provisioning PDUs 193 */ 194 void pb_gatt_register_packet_handler(btstack_packet_handler_t _packet_handler){ 195 pb_gatt_packet_handler = _packet_handler; 196 } 197 198 /** 199 * Send pdu 200 * @param con_handle 201 * @param pdu 202 * @param pdu_size 203 */ 204 void pb_gatt_send_pdu(uint16_t con_handle, const uint8_t * pdu, uint16_t size){ 205 if (!pdu || size <= 0) return; 206 if (con_handle == HCI_CON_HANDLE_INVALID) return; 207 // store pdu, request to send 208 proxy_pdu = pdu; 209 proxy_pdu_size = size; 210 segmentation_offset = 0; 211 212 // check if segmentation is necessary 213 if (proxy_pdu_size > (pb_gatt_mtu - 1)){ 214 segmentation_state = MESH_MSG_SAR_FIELD_FIRST_SEGMENT; 215 } else { 216 segmentation_state = MESH_MSG_SAR_FIELD_COMPLETE_MSG; 217 } 218 mesh_provisioning_service_server_request_can_send_now(con_handle); 219 } 220 /** 221 * Close Link 222 * @param con_handle 223 * @param reason 0 = success, 1 = timeout, 2 = fail 224 */ 225 void pb_gatt_close_link(hci_con_handle_t con_handle, uint8_t reason){ 226 UNUSED(con_handle); 227 UNUSED(reason); 228 } 229 230 /** 231 * Setup Link with unprovisioned device 232 * @param device_uuid 233 * @returns con_handle or HCI_CON_HANDLE_INVALID 234 */ 235 uint16_t pb_gatt_create_link(const uint8_t * device_uuid){ 236 UNUSED(device_uuid); 237 return HCI_CON_HANDLE_INVALID; 238 } 239