/** * Copyright (c) 2014 - 2019, Nordic Semiconductor ASA * * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other * materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include "sdk_errors.h" #include "sdk_config.h" #include "iot_common.h" #include "iot_pbuffer.h" #include "coap_transport.h" #include "coap.h" #include "udp_api.h" /**@brief UDP port information. */ typedef struct { uint32_t socket_id; /**< Socket information provided by UDP. */ uint16_t port_number; /**< Associated port number. */ } udp_port_t; static udp_port_t m_port_table[COAP_PORT_COUNT]; /**< Table maintaining association between CoAP ports and corresponding UDP socket identifiers. */ /**@brief Callback handler to receive data on the UDP port. * * @details Callback handler to receive data on the UDP port. * * @param[in] p_socket Socket identifier. * @param[in] p_ip_header IPv6 header containing source and destination addresses. * @param[in] p_udp_header UDP header identifying local and remote endpoints. * @param[in] process_result Result of data reception, there could be possible errors like * invalid checksum etc. * @param[in] iot_pbuffer_t Packet buffer containing the received data packet. * * @retval NRF_SUCCESS Indicates received data was handled successfully, else an an * error code indicating reason for failure.. */ static uint32_t port_data_callback(const udp6_socket_t * p_socket, const ipv6_header_t * p_ip_header, const udp6_header_t * p_udp_header, uint32_t process_result, iot_pbuffer_t * p_rx_packet) { uint32_t index; uint32_t retval = NRF_ERROR_NOT_FOUND; //Search for the port. for (index = 0; index < COAP_PORT_COUNT; index++) { //Matching port found. if (m_port_table[index].socket_id == p_socket->socket_id) { coap_remote_t remote_endpoint; coap_remote_t local_endpoint; const coap_port_t port = {p_udp_header->destport}; memcpy (remote_endpoint.addr, p_ip_header->srcaddr.u8, IPV6_ADDR_SIZE); remote_endpoint.port_number = p_udp_header->srcport; memcpy (local_endpoint.addr, p_ip_header->destaddr.u8, IPV6_ADDR_SIZE); local_endpoint.port_number = p_udp_header->destport; COAP_MUTEX_LOCK(); //Notify the module of received data. retval = coap_transport_read(&port, &remote_endpoint, &local_endpoint, process_result, p_rx_packet->p_payload, p_rx_packet->length); COAP_MUTEX_UNLOCK(); } } return retval; } /**@brief Creates port as requested in p_port. * * @details Creates port as requested in p_port. * * @param[in] index Index to the m_port_table where entry of the port created is to be made. * @param[in] p_port Port information to be created. * * @retval NRF_SUCCESS Indicates if port was created successfully, else an an error code * indicating reason for failure. */ static uint32_t port_create(uint32_t index, coap_port_t * p_port) { uint32_t err_code; udp6_socket_t socket; //Request new socket creation. err_code = udp6_socket_allocate(&socket); if (err_code == NRF_SUCCESS) { // Bind the socket to the local port. err_code = udp6_socket_bind(&socket, IPV6_ADDR_ANY, p_port->port_number); if (err_code == NRF_SUCCESS) { //Register data receive callback. err_code = udp6_socket_recv(&socket, port_data_callback); if (err_code == NRF_SUCCESS) { //All procedure with respect to port creation succeeded, make entry in the table. m_port_table[index].socket_id = socket.socket_id; m_port_table[index].port_number = p_port->port_number; socket.p_app_data = &m_port_table[index]; UNUSED_VARIABLE(udp6_socket_app_data_set(&socket)); } } if (err_code != NRF_SUCCESS) { //Not all procedures succeeded with allocated socket, hence free it. UNUSED_VARIABLE(udp6_socket_free(&socket)); } } return err_code; } uint32_t coap_transport_init(const coap_transport_init_t * p_param) { uint32_t err_code = NRF_ERROR_NO_MEM; uint32_t index; NULL_PARAM_CHECK(p_param); NULL_PARAM_CHECK(p_param->p_port_table); for (index = 0; index < COAP_PORT_COUNT; index++) { // Create end point for each of the CoAP ports. err_code = port_create(index, &p_param->p_port_table[index]); if (err_code != NRF_SUCCESS) { break; } } return err_code; } uint32_t coap_transport_write(const coap_port_t * p_port, const coap_remote_t * p_remote, const uint8_t * p_data, uint16_t datalen) { uint32_t err_code = NRF_ERROR_NOT_FOUND; uint32_t index; udp6_socket_t socket; ipv6_addr_t remote_addr; iot_pbuffer_t * p_buffer; iot_pbuffer_alloc_param_t buffer_param; NULL_PARAM_CHECK(p_port); NULL_PARAM_CHECK(p_remote); NULL_PARAM_CHECK(p_data); memcpy(remote_addr.u8, p_remote->addr, 16); buffer_param.type = UDP6_PACKET_TYPE; buffer_param.flags = PBUFFER_FLAG_DEFAULT; buffer_param.length = datalen; //Search for the corresponding port. for (index = 0; index < COAP_PORT_COUNT; index ++) { if (m_port_table[index].port_number == p_port->port_number) { //Allocate buffer to send the data on port. err_code = iot_pbuffer_allocate(&buffer_param, &p_buffer); if (err_code == NRF_SUCCESS) { socket.socket_id = m_port_table[index].socket_id; //Make a copy of the data onto the buffer. memcpy (p_buffer->p_payload, p_data, datalen); COAP_MUTEX_UNLOCK(); //Send on UDP port. err_code = udp6_socket_sendto(&socket, &remote_addr, p_remote->port_number, p_buffer); COAP_MUTEX_LOCK(); if (err_code != NRF_SUCCESS) { //Free the allocated buffer as send procedure has failed. UNUSED_VARIABLE(iot_pbuffer_free(p_buffer, true)); } } break; } } return err_code; } void coap_transport_process(void) { return; } uint32_t coap_security_setup(uint16_t local_port, nrf_tls_role_t role, coap_remote_t * const p_remote, nrf_tls_key_settings_t * const p_settings) { return NRF_ERROR_API_NOT_IMPLEMENTED; } uint32_t coap_security_destroy(uint16_t local_port, coap_remote_t * const p_remote) { return NRF_ERROR_API_NOT_IMPLEMENTED; }