/**************************************************************************** * net/udp/udp.h * * SPDX-License-Identifier: Apache-2.0 * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you 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 __NET_UDP_UDP_H #define __NET_UDP_UDP_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #ifdef CONFIG_NET_UDP_NOTIFIER # include #endif #if defined(CONFIG_NET_UDP) && !defined(CONFIG_NET_UDP_NO_STACK) /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define NET_UDP_HAVE_STACK 1 #ifdef CONFIG_NET_UDP_WRITE_BUFFERS /* UDP write buffer dump macros */ # ifdef CONFIG_DEBUG_FEATURES # define UDP_WBDUMP(msg,wrb,len,offset) \ udp_wrbuffer_dump(msg,wrb,len,offset) # else # define UDP_WBDUMP(msg,wrb,len,offset) # endif #endif /* Allocate a new UDP data callback */ #define udp_callback_alloc(dev,conn) \ devif_callback_alloc((dev), &(conn)->sconn.list, &(conn)->sconn.list_tail) #define udp_callback_free(dev,conn,cb) \ devif_conn_callback_free((dev), (cb), &(conn)->sconn.list, &(conn)->sconn.list_tail) /* Definitions for the UDP connection struct flag field */ #define _UDP_FLAG_CONNECTMODE (1 << 0) /* Bit 0: UDP connection-mode */ #define _UDP_ISCONNECTMODE(f) (((f) & _UDP_FLAG_CONNECTMODE) != 0) /* This is a helper pointer for accessing the contents of the udp header */ #define UDPIPv4BUF ((FAR struct udp_hdr_s *)IPBUF(IPv4_HDRLEN)) #define UDPIPv6BUF ((FAR struct udp_hdr_s *)IPBUF(IPv6_HDRLEN)) /**************************************************************************** * Public Type Definitions ****************************************************************************/ struct sockaddr; /* Forward reference */ struct socket; /* Forward reference */ struct net_driver_s; /* Forward reference */ struct pollfd; /* Forward reference */ /* Representation of a UDP connection */ struct devif_callback_s; /* Forward reference */ struct udp_hdr_s; /* Forward reference */ /* This is a container that holds the poll-related information */ struct udp_poll_s { FAR struct udp_conn_s *conn; /* Needed to handle loss of connection */ FAR struct net_driver_s *dev; /* Needed to free the callback structure */ FAR struct pollfd *fds; /* Needed to handle poll events */ FAR struct devif_callback_s *cb; /* Needed to teardown the poll */ }; struct udp_conn_s { /* Common prologue of all connection structures. */ struct socket_conn_s sconn; /* UDP-specific content follows */ 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 flags; /* See _UDP_FLAG_* definitions */ uint8_t domain; /* IP domain: PF_INET or PF_INET6 */ uint8_t crefs; /* Reference counts on this instance */ #if CONFIG_NET_RECV_BUFSIZE > 0 int32_t rcvbufs; /* Maximum amount of bytes queued in recv */ #endif #if CONFIG_NET_SEND_BUFSIZE > 0 int32_t sndbufs; /* Maximum amount of bytes queued in send */ sem_t sndsem; /* Semaphore signals send completion */ #endif #ifdef CONFIG_NETDEV_RSS int rcvcpu; /* Last recvfrom cpuid */ #endif /* Read-ahead buffering. * * readahead - An IOB chain where the UDP/IP read-ahead data is retained. */ FAR struct iob_s *readahead; /* Read-ahead buffering */ #ifdef CONFIG_NET_UDP_WRITE_BUFFERS /* Write buffering * * write_q - The queue of unsent I/O buffers. The head of this * list may be partially sent. FIFO ordering. */ sq_queue_t write_q; /* Write buffering for UDP packets */ FAR struct net_driver_s *dev; /* Last device */ /* Callback instance for UDP sendto() */ FAR struct devif_callback_s *sndcb; #endif #if defined(CONFIG_NET_IGMP) || defined(CONFIG_NET_MLD) struct ip_mreqn mreq; #endif /* The following is a list of poll structures of threads waiting for * socket events. */ struct udp_poll_s pollinfo[CONFIG_NET_UDP_NPOLLWAITERS]; #ifdef CONFIG_NET_TIMESTAMP int timestamp; /* Nonzero when SO_TIMESTAMP is enabled */ #endif }; /* This structure supports UDP write buffering. It is simply a container * for a IOB list and associated destination address. */ #ifdef CONFIG_NET_UDP_WRITE_BUFFERS struct udp_wrbuffer_s { sq_entry_t wb_node; /* Supports a singly linked list */ struct sockaddr_storage wb_dest; /* Destination address */ FAR struct iob_s *wb_iob; /* Head of the I/O buffer chain */ }; #endif /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus # define EXTERN extern "C" extern "C" { #else # define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * 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_conn_s *conn, 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_select_port * * Description: * Select an unused port number. * * NOTE that in principle this function could fail if there is no available * port number. There is no check for that case and it would actually * in an infinite loop if that were the case. In this simple, small UDP * implementation, it is reasonable to assume that that error cannot happen * and that a port number will always be available. * * Returned Value: * Next available port number in host byte order, 0 for failure. * ****************************************************************************/ uint16_t udp_select_port(uint8_t domain, FAR union ip_binding_u *u); /**************************************************************************** * 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 simply assigns a remote address to UDP "connection" * structure. This function is called as part of the implementation of: * * - connect(). If connect() is called for a SOCK_DGRAM socket, then * this logic performs the moral equivalent of connect() operation * for the UDP socket. * - recvfrom() and sendto(). This function is called to set the * remote address of the peer. * * The function will automatically allocate an unused local port for the * new connection if the socket is not yet bound to a local address. * However, another port can be chosen by using the udp_bind() call, * after the udp_connect() function has been called. * * Input Parameters: * conn - A reference to UDP connection structure. A value of NULL will * disconnect from any previously connected address. * addr - The address of the remote host. * * Assumptions: * This function is called (indirectly) from user code. Interrupts may * be enabled. * ****************************************************************************/ int udp_connect(FAR struct udp_conn_s *conn, FAR const struct sockaddr *addr); #if defined(CONFIG_NET_IGMP) /**************************************************************************** * Name: udp_leavegroup * * Description: * This function leaves the multicast group to which the conn belongs. * * Input Parameters: * conn - A reference to UDP connection structure. A value of NULL will * disconnect from any previously connected address. * * Assumptions: * This function is called (indirectly) from user code. Interrupts may * be enabled. * ****************************************************************************/ void udp_leavegroup(FAR struct udp_conn_s *conn); #else #define udp_leavegroup(c) #endif /**************************************************************************** * Name: udp_close * * Description: * Break any current UDP connection * * Input Parameters: * psock - An instance of the internal socket structure. * * Assumptions: * Called from normal user-level logic * ****************************************************************************/ int udp_close(FAR struct socket *psock); /**************************************************************************** * Name: 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 /**************************************************************************** * Name: 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 * * Input Parameters: * dev - The device driver structure to use in the send operation * conn - The UDP "connection" to poll for TX data * * Returned Value: * 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: psock_udp_cansend * * Description: * psock_udp_cansend() returns a value indicating if a write to the socket * would block. It is still possible that the write may block if another * write occurs first. * * Input Parameters: * conn A reference to UDP connection structure. * * Returned Value: * -ENOSYS (Function not implemented, always have to wait to send). * * Assumptions: * None * ****************************************************************************/ int psock_udp_cansend(FAR struct udp_conn_s *conn); /**************************************************************************** * Name: udp_send * * Description: * Set-up to send a UDP packet * * Input Parameters: * dev - The device driver structure to use in the send operation * conn - The UDP "connection" structure holding port information * * Returned Value: * 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_setsockopt * * Description: * udp_setsockopt() sets the UDP-protocol option specified by the * 'option' argument to the value pointed to by the 'value' argument for * the socket specified by the 'psock' argument. * * See for the a complete list of values of UDP protocol * options. * * Input Parameters: * psock Socket structure of socket to operate on * option identifies the option to set * value Points to the argument value * value_len The length of the argument value * * Returned Value: * Returns zero (OK) on success. On failure, it returns a negated errno * value to indicate the nature of the error. See psock_setcockopt() for * the list of possible error values. * ****************************************************************************/ #ifdef CONFIG_NET_UDPPROTO_OPTIONS int udp_setsockopt(FAR struct socket *psock, int option, FAR const void *value, socklen_t value_len); #endif /**************************************************************************** * Name: udp_wrbuffer_initialize * * Description: * Initialize the list of free write buffers * * Assumptions: * Called once early initialization. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_WRITE_BUFFERS void udp_wrbuffer_initialize(void); #endif /* CONFIG_NET_UDP_WRITE_BUFFERS */ /**************************************************************************** * Name: udp_wrbuffer_alloc * * Description: * Allocate a UDP write buffer by taking a pre-allocated buffer from * the free list. This function is called from UDP logic when a buffer * of UDP data is about to sent * * Input Parameters: * None * * Assumptions: * Called from user logic with the network locked. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_WRITE_BUFFERS struct udp_wrbuffer_s; FAR struct udp_wrbuffer_s *udp_wrbuffer_alloc(void); #endif /* CONFIG_NET_UDP_WRITE_BUFFERS */ /**************************************************************************** * Name: udp_wrbuffer_timedalloc * * Description: * Allocate a UDP write buffer by taking a pre-allocated buffer from * the free list. This function is called from udp logic when a buffer * of udp data is about to sent * This function is wrapped version of udp_wrbuffer_alloc(), * this wait will be terminated when the specified timeout expires. * * Input Parameters: * timeout - The relative time to wait until a timeout is declared. * * Assumptions: * Called from user logic with the network locked. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_WRITE_BUFFERS FAR struct udp_wrbuffer_s *udp_wrbuffer_timedalloc(unsigned int timeout); #endif /* CONFIG_NET_UDP_WRITE_BUFFERS */ /**************************************************************************** * Name: udp_wrbuffer_tryalloc * * Description: * Try to allocate a UDP write buffer by taking a pre-allocated buffer from * the free list. This function is called from UDP logic when a buffer * of UDP data is about to be sent if the socket is non-blocking. Returns * immediately if allocation fails. * * Input parameters: * None * * Assumptions: * Called from user logic with the network locked. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_WRITE_BUFFERS #ifdef CONFIG_NET_JUMBO_FRAME FAR struct udp_wrbuffer_s *udp_wrbuffer_tryalloc(int len); #else FAR struct udp_wrbuffer_s *udp_wrbuffer_tryalloc(void); #endif #endif /* CONFIG_NET_UDP_WRITE_BUFFERS */ /**************************************************************************** * Name: udp_wrbuffer_release * * Description: * Release a UDP write buffer by returning the buffer to the free list. * This function is called from user logic after it is consumed the * buffered data. * * Assumptions: * Called from network stack logic with the network stack locked * ****************************************************************************/ #ifdef CONFIG_NET_UDP_WRITE_BUFFERS void udp_wrbuffer_release(FAR struct udp_wrbuffer_s *wrb); #endif /* CONFIG_NET_UDP_WRITE_BUFFERS */ /**************************************************************************** * Name: udp_wrbuffer_inqueue_size * * Description: * Get the in-queued write buffer size from connection * * Input Parameters: * conn - The UDP connection of interest * * Assumptions: * Called from user logic with the network locked. * ****************************************************************************/ #if CONFIG_NET_SEND_BUFSIZE > 0 uint32_t udp_wrbuffer_inqueue_size(FAR struct udp_conn_s *conn); #endif /* CONFIG_NET_SEND_BUFSIZE */ /**************************************************************************** * Name: udp_wrbuffer_test * * Description: * Check if there is room in the write buffer. Does not reserve any space. * * Assumptions: * None. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_WRITE_BUFFERS int udp_wrbuffer_test(void); #endif /* CONFIG_NET_UDP_WRITE_BUFFERS */ /**************************************************************************** * Name: udp_wrbuffer_dump * * Description: * Dump the contents of a write buffer. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_WRITE_BUFFERS #ifdef CONFIG_DEBUG_FEATURES void udp_wrbuffer_dump(FAR const char *msg, FAR struct udp_wrbuffer_s *wrb, unsigned int len, unsigned int offset); #else # define udp_wrbuffer_dump(msg,wrb) #endif #endif /* CONFIG_NET_UDP_WRITE_BUFFERS */ /**************************************************************************** * Name: udp_ipv4_input * * Description: * Handle incoming UDP input in an IPv4 packet * * Input Parameters: * dev - The device driver structure containing the received UDP packet * * Returned Value: * 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 * * Input Parameters: * dev - The device driver structure containing the received UDP packet * iplen - The size of the IPv6 header. This may be larger than * IPv6_HDRLEN the IPv6 header if IPv6 extension headers are * present. * * Returned Value: * 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, unsigned int iplen); #endif /**************************************************************************** * Name: udp_find_laddr_device * * Description: * Select the network driver to use with the UDP transaction using the * locally bound IP address. * * Input Parameters: * conn - UDP connection structure (not currently used). * * Returned Value: * A pointer to the network driver to use. NULL is returned if driver is * not bound to any local device. * ****************************************************************************/ FAR struct net_driver_s *udp_find_laddr_device(FAR struct udp_conn_s *conn); /**************************************************************************** * Name: udp_find_raddr_device * * Description: * Select the network driver to use with the UDP transaction using the * remote IP address. * * Input Parameters: * conn - UDP connection structure (not currently used). * * Returned Value: * A pointer to the network driver to use. * ****************************************************************************/ FAR struct net_driver_s * udp_find_raddr_device(FAR struct udp_conn_s *conn, FAR struct sockaddr_storage *remote); /**************************************************************************** * Name: 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); /**************************************************************************** * Name: psock_udp_recvfrom * * Description: * Perform the recvfrom operation for a UDP SOCK_DGRAM * * Input Parameters: * psock Pointer to the socket structure for the SOCK_DRAM socket * msg Receive info and buffer for receive data * flags Receive flags * * Returned Value: * On success, returns the number of characters received. On error, * -errno is returned (see recvfrom for list of errnos). * * Assumptions: * ****************************************************************************/ ssize_t psock_udp_recvfrom(FAR struct socket *psock, FAR struct msghdr *msg, int flags); /**************************************************************************** * Name: 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); /**************************************************************************** * Name: 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 * ****************************************************************************/ int udp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds); /**************************************************************************** * Name: udp_pollteardown * * Description: * Teardown monitoring of events on an 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 * ****************************************************************************/ int udp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds); /**************************************************************************** * Name: udp_readahead_notifier_setup * * Description: * Set up to perform a callback to the worker function when an UDP data * is added to the read-ahead buffer. The worker function will execute * on the low priority worker thread. * * Input Parameters: * worker - The worker function to execute on the low priority work * queue when data is available in the UDP read-ahead buffer. * conn - The UDP connection where read-ahead data is needed. * arg - A user-defined argument that will be available to the worker * function when it runs. * * Returned Value: * > 0 - The notification is in place. The returned value is a key that * may be used later in a call to udp_notifier_teardown(). * == 0 - There is already buffered read-ahead data. No notification * will be provided. * < 0 - An unexpected error occurred and no notification will occur. * The returned value is a negated errno value that indicates the * nature of the failure. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_NOTIFIER int udp_readahead_notifier_setup(worker_t worker, FAR struct udp_conn_s *conn, FAR void *arg); #endif /**************************************************************************** * Name: udp_writebuffer_notifier_setup * * Description: * Set up to perform a callback to the worker function when an UDP write * buffer is emptied. The worker function will execute on the high * priority worker thread. * * Input Parameters: * worker - The worker function to execute on the low priority work * queue when data is available in the UDP read-ahead buffer. * conn - The UDP connection where read-ahead data is needed. * arg - A user-defined argument that will be available to the worker * function when it runs. * * Returned Value: * > 0 - The notification is in place. The returned value is a key that * may be used later in a call to udp_notifier_teardown(). * == 0 - There is already buffered read-ahead data. No notification * will be provided. * < 0 - An unexpected error occurred and no notification will occur. * The returned value is a negated errno value that indicates the * nature of the failure. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_NOTIFIER int udp_writebuffer_notifier_setup(worker_t worker, FAR struct udp_conn_s *conn, FAR void *arg); #endif /**************************************************************************** * Name: udp_notifier_teardown * * Description: * Eliminate a UDP read-ahead notification previously setup by * udp_readahead_notifier_setup(). This function should only be called if * the notification should be aborted prior to the notification. The * notification will automatically be torn down after the notification. * * Input Parameters: * key - The key value returned from a previous call to * udp_readahead_notifier_setup(). * * Returned Value: * None. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_NOTIFIER void udp_notifier_teardown(int key); #endif /**************************************************************************** * Name: udp_readahead_signal * * Description: * Read-ahead data has been buffered. Notify all threads waiting for * read-ahead data to become available. * * When read-ahead data becomes available, *all* of the workers waiting * for read-ahead data will be executed. If there are multiple workers * waiting for read-ahead data then only the first to execute will get the * data. Others will need to call udp_readahead_notifier_setup once again. * * Input Parameters: * conn - The UDP connection where read-ahead data was just buffered. * * Returned Value: * None. * ****************************************************************************/ #ifdef CONFIG_NET_UDP_NOTIFIER void udp_readahead_signal(FAR struct udp_conn_s *conn); #endif /**************************************************************************** * Name: udp_writebuffer_signal * * Description: * All buffer Tx data has been sent. Signal all threads waiting for the * write buffers to become empty. * * When write buffer becomes empty, *all* of the workers waiting * for that event data will be executed. If there are multiple workers * waiting for read-ahead data then only the first to execute will get the * data. Others will need to call udp_writebuffer_notifier_setup() once * again. * * Input Parameters: * conn - The UDP connection where read-ahead data was just buffered. * * Returned Value: * None. * ****************************************************************************/ #if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_NET_UDP_NOTIFIER) void udp_writebuffer_signal(FAR struct udp_conn_s *conn); #endif /**************************************************************************** * Name: udp_txdrain * * Description: * Wait for all write buffers to be sent (or for a timeout to occur). * * Input Parameters: * psock - An instance of the internal socket structure. * timeout - The relative time when the timeout will occur * * Returned Value: * Zero (OK) is returned on success; a negated errno value is returned * on any failure. * ****************************************************************************/ #if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_NET_UDP_NOTIFIER) int udp_txdrain(FAR struct socket *psock, unsigned int timeout); #else # define udp_txdrain(conn, timeout) (0) #endif /**************************************************************************** * Name: udp_ioctl * * Description: * This function performs udp specific ioctl() operations. * * Parameters: * conn The TCP connection of interest * cmd The ioctl command * arg The argument of the ioctl cmd * ****************************************************************************/ int udp_ioctl(FAR struct udp_conn_s *conn, int cmd, unsigned long arg); /**************************************************************************** * Name: udp_sendbuffer_notify * * Description: * Notify the send buffer semaphore * * Input Parameters: * conn - The UDP connection of interest * * Assumptions: * Called from user logic with the network locked. * ****************************************************************************/ #if CONFIG_NET_SEND_BUFSIZE > 0 void udp_sendbuffer_notify(FAR struct udp_conn_s *conn); #endif /* CONFIG_NET_SEND_BUFSIZE */ /**************************************************************************** * Name: udpip_hdrsize * * Description: * Get the total size of L3 and L4 UDP header * * Input Parameters: * conn The connection structure associated with the socket * * Returned Value: * the total size of L3 and L4 TCP header * ****************************************************************************/ uint16_t udpip_hdrsize(FAR struct udp_conn_s *conn); #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_NET_UDP && !CONFIG_NET_UDP_NO_STACK */ #endif /* __NET_UDP_UDP_H */