/**************************************************************************** * net/udp/udp.h * * Copyright (C) 2014-2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 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 NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER 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. * ****************************************************************************/ #ifndef __NET_UDP_UDP_H #define __NET_UDP_UDP_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #ifdef CONFIG_NET_UDP_READAHEAD # include #endif #ifdef CONFIG_NET_UDP /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Conditions for support UDP poll/select operations */ #if !defined(CONFIG_DISABLE_POLL) && CONFIG_NSOCKET_DESCRIPTORS > 0 && \ defined(CONFIG_NET_UDP_READAHEAD) # define HAVE_UDP_POLL #endif /* Allocate a new UDP data callback */ #define udp_callback_alloc(conn) devif_callback_alloc(&conn->list) #define udp_callback_free(conn,cb) devif_callback_free(cb, &conn->list) /**************************************************************************** * Public Type Definitions ****************************************************************************/ /* Representation of a uIP UDP connection */ struct devif_callback_s; /* Forward reference */ struct udp_hdr_s; /* Forward reference */ struct udp_conn_s { dq_entry_t node; /* Supports a doubly linked list */ union ip_binding_u u; /* IP address binding */ uint16_t lport; /* Bound local port number (network byte order) */ uint16_t rport; /* Remote port number (network byte order) */ uint8_t domain; /* IP domain: PF_INET or PF_INET6 */ uint8_t ttl; /* Default time-to-live */ uint8_t crefs; /* Reference counts on this instance */ #ifdef CONFIG_NET_UDP_READAHEAD /* Read-ahead buffering. * * readahead - A singly linked list of type struct iob_qentry_s * where the UDP/IP read-ahead data is retained. */ struct iob_queue_s readahead; /* Read-ahead buffering */ #endif /* Defines the list of UDP callbacks */ FAR struct devif_callback_s *list; }; /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus # define EXTERN extern "C" extern "C" { #else # define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ struct sockaddr; /* Forward reference */ struct socket; /* Forward reference */ struct net_driver_s; /* Forward reference */ struct pollfd; /* Forward reference */ /**************************************************************************** * Name: udp_initialize * * Description: * Initialize the UDP connection structures. Called once and only from * the UIP layer. * ****************************************************************************/ void udp_initialize(void); /**************************************************************************** * Name: udp_alloc * * Description: * Allocate a new, uninitialized UDP connection structure. This is * normally something done by the implementation of the socket() API * ****************************************************************************/ FAR struct udp_conn_s *udp_alloc(uint8_t domain); /**************************************************************************** * Name: udp_free * * Description: * Free a UDP connection structure that is no longer in use. This should be * done by the implementation of close(). * ****************************************************************************/ void udp_free(FAR struct udp_conn_s *conn); /**************************************************************************** * Name: udp_active * * Description: * Find a connection structure that is the appropriate * connection to be used within the provided UDP/IP header * * Assumptions: * Called from network stack logic with the network stack locked * ****************************************************************************/ FAR struct udp_conn_s *udp_active(FAR struct net_driver_s *dev, FAR struct udp_hdr_s *udp); /**************************************************************************** * Name: udp_nextconn * * Description: * Traverse the list of allocated UDP connections * * Assumptions: * Called from network stack logic with the network stack locked * ****************************************************************************/ FAR struct udp_conn_s *udp_nextconn(FAR struct udp_conn_s *conn); /**************************************************************************** * Name: udp_bind * * Description: * This function implements the low-level parts of the standard UDP bind() * operation. * * Assumptions: * This function is called from normal user level code. * ****************************************************************************/ int udp_bind(FAR struct udp_conn_s *conn, FAR const struct sockaddr *addr); /**************************************************************************** * Name: udp_connect * * Description: * This function sets up a new UDP connection. The function will * automatically allocate an unused local port for the new * connection. However, another port can be chosen by using the * udp_bind() call, after the udp_connect() function has been * called. * * This function is called as part of the implementation of sendto * and recvfrom. * * Input Parameters: * conn - A reference to UDP connection structure * addr - The address of the remote host. * * Assumptions: * This function is called user code. Interrupts may be enabled. * ****************************************************************************/ int udp_connect(FAR struct udp_conn_s *conn, FAR const struct sockaddr *addr); /**************************************************************************** * Function: udp_ipv4_select * * Description: * Configure to send or receive an UDP IPv4 packet * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 void udp_ipv4_select(FAR struct net_driver_s *dev); #endif /**************************************************************************** * Function: udp_ipv6_select * * Description: * Configure to send or receive an UDP IPv6 packet * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 void udp_ipv6_select(FAR struct net_driver_s *dev); #endif /**************************************************************************** * Name: udp_poll * * Description: * Poll a UDP "connection" structure for availability of TX data * * Parameters: * dev - The device driver structure to use in the send operation * conn - The UDP "connection" to poll for TX data * * Return: * None * * Assumptions: * Called from network stack logic with the network stack locked * ****************************************************************************/ void udp_poll(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn); /**************************************************************************** * Name: udp_send * * Description: * Set-up to send a UDP packet * * Parameters: * dev - The device driver structure to use in the send operation * conn - The UDP "connection" structure holding port information * * Return: * None * * Assumptions: * Called from network stack logic with the network stack locked * ****************************************************************************/ void udp_send(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn); /**************************************************************************** * Name: udp_ipv4_input * * Description: * Handle incoming UDP input in an IPv4 packet * * Parameters: * dev - The device driver structure containing the received UDP packet * * Return: * OK The packet has been processed and can be deleted * ERROR Hold the packet and try again later. There is a listening socket * but no receive in place to catch the packet yet. * * Assumptions: * Called from network stack logic with the network stack locked * ****************************************************************************/ #ifdef CONFIG_NET_IPv4 int udp_ipv4_input(FAR struct net_driver_s *dev); #endif /**************************************************************************** * Name: udp_ipv6_input * * Description: * Handle incoming UDP input in an IPv6 packet * * Parameters: * dev - The device driver structure containing the received UDP packet * * Return: * OK The packet has been processed and can be deleted * ERROR Hold the packet and try again later. There is a listening socket * but no receive in place to catch the packet yet. * * Assumptions: * Called from network stack logic with the network stack locked * ****************************************************************************/ #ifdef CONFIG_NET_IPv6 int udp_ipv6_input(FAR struct net_driver_s *dev); #endif /**************************************************************************** * Function: udp_callback * * Description: * Inform the application holding the UDP socket of a change in state. * * Returned Value: * OK if packet has been processed, otherwise ERROR. * * Assumptions: * Called from network stack logic with the network stack locked * ****************************************************************************/ uint16_t udp_callback(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn, uint16_t flags); /**************************************************************************** * Function: psock_udp_sendto * * Description: * This function implements the UDP-specific logic of the standard * sendto() socket operation. * * Input Parameters: * psock A pointer to a NuttX-specific, internal socket structure * buf Data to send * len Length of data to send * flags Send flags * to Address of recipient * tolen The length of the address structure * * NOTE: All input parameters were verified by sendto() before this * function was called. * * Returned Value: * On success, returns the number of characters sent. On error, * a negated errno value is returned. See the description in * net/socket/sendto.c for the list of appropriate return value. * ****************************************************************************/ ssize_t psock_udp_sendto(FAR struct socket *psock, FAR const void *buf, size_t len, int flags, FAR const struct sockaddr *to, socklen_t tolen); /**************************************************************************** * Function: udp_pollsetup * * Description: * Setup to monitor events on one UDP/IP socket * * Input Parameters: * psock - The UDP/IP socket of interest * fds - The structure describing the events to be monitored, OR NULL if * this is a request to stop monitoring events. * * Returned Value: * 0: Success; Negated errno on failure * ****************************************************************************/ #ifdef HAVE_UDP_POLL int udp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds); #endif /**************************************************************************** * Function: udp_pollteardown * * Description: * Teardown monitoring of events on an UDP/IP socket * * Input Parameters: * psock - The TCP/IP socket of interest * fds - The structure describing the events to be monitored, OR NULL if * this is a request to stop monitoring events. * * Returned Value: * 0: Success; Negated errno on failure * ****************************************************************************/ #ifdef HAVE_UDP_POLL int udp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds); #endif #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_NET_UDP */ #endif /* __NET_UDP_UDP_H */