515 lines
17 KiB
C
515 lines
17 KiB
C
/****************************************************************************
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* net/udp/udp.h
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*
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* Copyright (C) 2014-2015 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 <queue.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/net/iob.h>
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#endif
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#ifdef CONFIG_NET_UDP
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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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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/* 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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/* Defines the list of UDP callbacks */
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FAR struct devif_callback_s *list;
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};
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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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* Function: 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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* Function: 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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* 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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* Return:
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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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* 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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* Return:
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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_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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* Parameters:
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* dev - The device driver structure containing the received UDP packet
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*
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* Return:
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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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* Parameters:
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* dev - The device driver structure containing the received UDP packet
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*
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* Return:
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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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* Function: 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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* Function: 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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* Function: 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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* Function: 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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* Function: 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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* Function: 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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* Function: 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
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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* to Address of recipient
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* tolen The length of the address structure
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*
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* NOTE: All input parameters were verified by sendto() before this
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* function was called.
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* a negated errno value is returned. See the description in
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* net/socket/sendto.c for the list of appropriate return value.
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*
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****************************************************************************/
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ssize_t psock_udp_sendto(FAR struct socket *psock, FAR const void *buf,
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size_t len, int flags, FAR const struct sockaddr *to,
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socklen_t tolen);
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/****************************************************************************
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* Function: udp_pollsetup
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*
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* Description:
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* Setup to monitor events on one UDP/IP socket
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*
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* Input Parameters:
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* psock - The UDP/IP socket of interest
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* fds - The structure describing the events to be monitored, OR NULL if
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* this is a request to stop monitoring events.
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*
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* Returned Value:
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* 0: Success; Negated errno on failure
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*
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****************************************************************************/
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#ifdef HAVE_UDP_POLL
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int udp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
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#endif
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/****************************************************************************
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* Function: udp_pollteardown
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*
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* Description:
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* Teardown monitoring of events on an UDP/IP socket
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*
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* Input Parameters:
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* psock - The TCP/IP socket of interest
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* fds - The structure describing the events to be monitored, OR NULL if
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* this is a request to stop monitoring events.
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*
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* Returned Value:
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* 0: Success; Negated errno on failure
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*
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****************************************************************************/
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#ifdef HAVE_UDP_POLL
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int udp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds);
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_NET_UDP */
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#endif /* __NET_UDP_UDP_H */
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