644 lines
20 KiB
C
644 lines
20 KiB
C
/****************************************************************************
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* net/udp/udp.h
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*
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* Copyright (C) 2014-2015, 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __NET_UDP_UDP_H
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#define __NET_UDP_UDP_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <queue.h>
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#include <nuttx/clock.h>
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#include <nuttx/net/ip.h>
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#ifdef CONFIG_NET_UDP_READAHEAD
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# include <nuttx/mm/iob.h>
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#endif
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#if defined(CONFIG_NET_UDP) && !defined(CONFIG_NET_UDP_NO_STACK)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define NET_UDP_HAVE_STACK 1
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/* Conditions for support UDP poll/select operations */
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#if !defined(CONFIG_DISABLE_POLL) && CONFIG_NSOCKET_DESCRIPTORS > 0 && \
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defined(CONFIG_NET_UDP_READAHEAD)
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# define HAVE_UDP_POLL
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#endif
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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/* UDP write buffer dump macros */
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# ifdef CONFIG_DEBUG_FEATURES
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# define UDP_WBDUMP(msg,wrb,len,offset) \
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udp_wrbuffer_dump(msg,wrb,len,offset)
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# else
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# define UDP_WBDUMP(msg,wrb,len,offset)
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# endif
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#endif
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/* Allocate a new UDP data callback */
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#define udp_callback_alloc(dev,conn) \
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devif_callback_alloc((dev), &(conn)->list)
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#define udp_callback_free(dev,conn,cb) \
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devif_conn_callback_free((dev), (cb), &(conn)->list)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* Representation of a UDP connection */
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struct devif_callback_s; /* Forward reference */
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struct udp_hdr_s; /* Forward reference */
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struct udp_conn_s
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{
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dq_entry_t node; /* Supports a doubly linked list */
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union ip_binding_u u; /* IP address binding */
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uint16_t lport; /* Bound local port number (network byte order) */
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uint16_t rport; /* Remote port number (network byte order) */
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uint8_t domain; /* IP domain: PF_INET or PF_INET6 */
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uint8_t ttl; /* Default time-to-live */
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uint8_t crefs; /* Reference counts on this instance */
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#ifdef CONFIG_NET_UDP_READAHEAD
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/* Read-ahead buffering.
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*
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* readahead - A singly linked list of type struct iob_qentry_s
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* where the UDP/IP read-ahead data is retained.
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*/
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struct iob_queue_s readahead; /* Read-ahead buffering */
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#endif
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#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
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/* Write buffering
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*
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* write_q - The queue of unsent I/O buffers. The head of this
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* list may be partially sent. FIFO ordering.
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*/
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sq_queue_t write_q; /* Write buffering for UDP packets */
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FAR struct net_driver_s *dev; /* Last device */
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#endif
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/* Defines the list of UDP callbacks */
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FAR struct devif_callback_s *list;
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};
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/* This structure supports UDP write buffering. It is simply a container
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* for a IOB list and associated destination address.
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*/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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struct udp_wrbuffer_s
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{
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sq_entry_t wb_node; /* Supports a singly linked list */
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struct sockaddr_storage wb_dest; /* Destination address */
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#ifdef CONFIG_NET_SOCKOPTS
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systime_t wb_start; /* Start time for timeout calculation */
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#endif
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struct iob_s *wb_iob; /* Head of the I/O buffer chain */
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};
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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# define EXTERN extern "C"
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extern "C"
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{
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#else
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# define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct sockaddr; /* Forward reference */
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struct socket; /* Forward reference */
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struct net_driver_s; /* Forward reference */
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struct pollfd; /* Forward reference */
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/****************************************************************************
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* Name: udp_initialize
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*
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* Description:
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* Initialize the UDP connection structures. Called once and only from
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* the UIP layer.
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*
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****************************************************************************/
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void udp_initialize(void);
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/****************************************************************************
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* Name: udp_alloc
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*
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* Description:
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* Allocate a new, uninitialized UDP connection structure. This is
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* normally something done by the implementation of the socket() API
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*
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****************************************************************************/
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FAR struct udp_conn_s *udp_alloc(uint8_t domain);
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/****************************************************************************
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* Name: udp_free
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*
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* Description:
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* Free a UDP connection structure that is no longer in use. This should be
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* done by the implementation of close().
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*
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****************************************************************************/
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void udp_free(FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: udp_active
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*
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* Description:
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* Find a connection structure that is the appropriate
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* connection to be used within the provided UDP/IP header
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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FAR struct udp_conn_s *udp_active(FAR struct net_driver_s *dev,
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FAR struct udp_hdr_s *udp);
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/****************************************************************************
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* Name: udp_nextconn
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*
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* Description:
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* Traverse the list of allocated UDP connections
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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FAR struct udp_conn_s *udp_nextconn(FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: udp_bind
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*
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* Description:
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* This function implements the low-level parts of the standard UDP bind()
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* operation.
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*
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* Assumptions:
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* This function is called from normal user level code.
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*
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****************************************************************************/
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int udp_bind(FAR struct udp_conn_s *conn, FAR const struct sockaddr *addr);
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/****************************************************************************
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* Name: udp_connect
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*
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* Description:
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* This function sets up a new UDP connection. The function will
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* automatically allocate an unused local port for the new
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* connection. However, another port can be chosen by using the
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* udp_bind() call, after the udp_connect() function has been
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* called.
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*
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* This function is called as part of the implementation of sendto
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* and recvfrom.
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*
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* Input Parameters:
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* conn - A reference to UDP connection structure
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* addr - The address of the remote host.
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*
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* Assumptions:
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* This function is called user code. Interrupts may be enabled.
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*
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****************************************************************************/
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int udp_connect(FAR struct udp_conn_s *conn, FAR const struct sockaddr *addr);
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/****************************************************************************
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* Name: udp_ipv4_select
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*
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* Description:
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* Configure to send or receive an UDP IPv4 packet
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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void udp_ipv4_select(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: udp_ipv6_select
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*
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* Description:
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* Configure to send or receive an UDP IPv6 packet
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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void udp_ipv6_select(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: udp_poll
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*
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* Description:
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* Poll a UDP "connection" structure for availability of TX data
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The UDP "connection" to poll for TX data
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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void udp_poll(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: udp_send
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*
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* Description:
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* Set-up to send a UDP packet
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The UDP "connection" structure holding port information
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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void udp_send(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: udp_wrbuffer_initialize
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*
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* Description:
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* Initialize the list of free write buffers
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*
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* Assumptions:
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* Called once early initialization.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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void udp_wrbuffer_initialize(void);
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_wrbuffer_alloc
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*
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* Description:
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* Allocate a UDP write buffer by taking a pre-allocated buffer from
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* the free list. This function is called from UDP logic when a buffer
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* of UDP data is about to sent
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*
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* Input Parameters:
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* None
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*
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* Assumptions:
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* Called from user logic with the network locked.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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struct udp_wrbuffer_s;
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FAR struct udp_wrbuffer_s *udp_wrbuffer_alloc(void);
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_wrbuffer_release
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*
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* Description:
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* Release a UDP write buffer by returning the buffer to the free list.
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* This function is called from user logic after it is consumed the
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* buffered data.
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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void udp_wrbuffer_release(FAR struct udp_wrbuffer_s *wrb);
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_wrbuffer_test
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*
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* Description:
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* Check if there is room in the write buffer. Does not reserve any space.
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*
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* Assumptions:
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* None.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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int udp_wrbuffer_test(void);
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_wrbuffer_dump
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*
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* Description:
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* Dump the contents of a write buffer.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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#ifdef CONFIG_DEBUG_FEATURES
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void udp_wrbuffer_dump(FAR const char *msg, FAR struct udp_wrbuffer_s *wrb,
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unsigned int len, unsigned int offset);
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#else
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# define udp_wrbuffer_dump(msg,wrb)
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#endif
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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/****************************************************************************
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* Name: udp_ipv4_input
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*
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* Description:
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* Handle incoming UDP input in an IPv4 packet
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*
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* Input Parameters:
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* dev - The device driver structure containing the received UDP packet
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*
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* Returned Value:
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* OK The packet has been processed and can be deleted
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* ERROR Hold the packet and try again later. There is a listening socket
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* but no receive in place to catch the packet yet.
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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int udp_ipv4_input(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: udp_ipv6_input
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*
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* Description:
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* Handle incoming UDP input in an IPv6 packet
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*
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* Input Parameters:
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* dev - The device driver structure containing the received UDP packet
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*
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* Returned Value:
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* OK The packet has been processed and can be deleted
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* ERROR Hold the packet and try again later. There is a listening socket
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* but no receive in place to catch the packet yet.
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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int udp_ipv6_input(FAR struct net_driver_s *dev);
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#endif
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/****************************************************************************
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* Name: udp_find_ipv4_device
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*
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* Description:
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* Select the network driver to use with the IPv4 UDP transaction.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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* ipv4addr - The IPv4 address to use in the device selection.
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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FAR struct net_driver_s *udp_find_ipv4_device(FAR struct udp_conn_s *conn,
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in_addr_t ipv4addr);
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#endif
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/****************************************************************************
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* Name: udp_find_ipv6_device
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*
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* Description:
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* Select the network driver to use with the IPv6 UDP transaction.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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* ipv6addr - The IPv6 address to use in the device selection.
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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FAR struct net_driver_s *udp_find_ipv6_device(FAR struct udp_conn_s *conn,
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net_ipv6addr_t ipv6addr);
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#endif
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/****************************************************************************
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* Name: udp_find_laddr_device
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*
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* Description:
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* Select the network driver to use with the UDP transaction using the
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* locally bound IP address.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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FAR struct net_driver_s *udp_find_laddr_device(FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: udp_find_raddr_device
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*
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* Description:
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* Select the network driver to use with the UDP transaction using the
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* remote IP address.
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*
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* Input Parameters:
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* conn - UDP connection structure (not currently used).
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*
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* Returned Value:
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* A pointer to the network driver to use.
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*
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****************************************************************************/
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FAR struct net_driver_s *udp_find_raddr_device(FAR struct udp_conn_s *conn);
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/****************************************************************************
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* Name: udp_callback
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*
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* Description:
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* Inform the application holding the UDP socket of a change in state.
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*
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* Returned Value:
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* OK if packet has been processed, otherwise ERROR.
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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uint16_t udp_callback(FAR struct net_driver_s *dev,
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FAR struct udp_conn_s *conn, uint16_t flags);
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/****************************************************************************
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* Name: psock_udp_send
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*
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* Description:
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* Implements send() for connected UDP sockets
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*
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****************************************************************************/
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ssize_t psock_udp_send(FAR struct socket *psock, FAR const void *buf,
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size_t len);
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|
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/****************************************************************************
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* Name: psock_udp_sendto
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*
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* Description:
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* This function implements the UDP-specific logic of the standard
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* sendto() socket operation.
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*
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* Input Parameters:
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* 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef HAVE_UDP_POLL
|
|
int udp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
#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 && !CONFIG_NET_UDP_NO_STACK */
|
|
#endif /* __NET_UDP_UDP_H */
|