1026 lines
34 KiB
C
1026 lines
34 KiB
C
/****************************************************************************
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* net/udp/udp.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <nuttx/queue.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/udp.h>
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#include <nuttx/mm/iob.h>
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#ifdef CONFIG_NET_UDP_NOTIFIER
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# include <nuttx/wqueue.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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#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)->sconn.list, &(conn)->sconn.list_tail)
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#define udp_callback_free(dev,conn,cb) \
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devif_conn_callback_free((dev), (cb), &(conn)->sconn.list, &(conn)->sconn.list_tail)
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/* Definitions for the UDP connection struct flag field */
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#define _UDP_FLAG_CONNECTMODE (1 << 0) /* Bit 0: UDP connection-mode */
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#define _UDP_ISCONNECTMODE(f) (((f) & _UDP_FLAG_CONNECTMODE) != 0)
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/* This is a helper pointer for accessing the contents of the udp header */
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#define UDPIPv4BUF ((FAR struct udp_hdr_s *)IPBUF(IPv4_HDRLEN))
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#define UDPIPv6BUF ((FAR struct udp_hdr_s *)IPBUF(IPv6_HDRLEN))
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/****************************************************************************
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* Public Type Definitions
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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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/* 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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/* This is a container that holds the poll-related information */
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struct udp_poll_s
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{
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FAR struct udp_conn_s *conn; /* Needed to handle loss of connection */
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FAR struct net_driver_s *dev; /* Needed to free the callback structure */
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FAR struct pollfd *fds; /* Needed to handle poll events */
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FAR struct devif_callback_s *cb; /* Needed to teardown the poll */
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};
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struct udp_conn_s
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{
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/* Common prologue of all connection structures. */
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struct socket_conn_s sconn;
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/* UDP-specific content follows */
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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 flags; /* See _UDP_FLAG_* definitions */
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uint8_t domain; /* IP domain: PF_INET or PF_INET6 */
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uint8_t crefs; /* Reference counts on this instance */
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#if CONFIG_NET_RECV_BUFSIZE > 0
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int32_t rcvbufs; /* Maximum amount of bytes queued in recv */
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#endif
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#if CONFIG_NET_SEND_BUFSIZE > 0
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int32_t sndbufs; /* Maximum amount of bytes queued in send */
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sem_t sndsem; /* Semaphore signals send completion */
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#endif
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/* Read-ahead buffering.
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*
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* readahead - An IOB chain where the UDP/IP read-ahead data is retained.
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*/
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FAR struct iob_s *readahead; /* Read-ahead buffering */
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#ifdef CONFIG_NET_UDP_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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/* Callback instance for UDP sendto() */
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FAR struct devif_callback_s *sndcb;
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#endif
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#if defined(CONFIG_NET_IGMP) || defined(CONFIG_NET_MLD)
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struct ip_mreqn mreq;
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#endif
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/* The following is a list of poll structures of threads waiting for
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* socket events.
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*/
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struct udp_poll_s pollinfo[CONFIG_NET_UDP_NPOLLWAITERS];
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#ifdef CONFIG_NET_TIMESTAMP
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int timestamp; /* Nonzero when SO_TIMESTAMP is enabled */
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#endif
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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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FAR 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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/****************************************************************************
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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_conn_s *conn,
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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_select_port
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*
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* Description:
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* Select an unused port number.
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*
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* NOTE that in principle this function could fail if there is no available
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* port number. There is no check for that case and it would actually
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* in an infinite loop if that were the case. In this simple, small UDP
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* implementation, it is reasonable to assume that that error cannot happen
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* and that a port number will always be available.
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*
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* Returned Value:
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* Next available port number in host byte order, 0 for failure.
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*
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****************************************************************************/
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uint16_t udp_select_port(uint8_t domain, FAR union ip_binding_u *u);
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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 simply assigns a remote address to UDP "connection"
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* structure. This function is called as part of the implementation of:
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*
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* - connect(). If connect() is called for a SOCK_DGRAM socket, then
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* this logic performs the moral equivalent of connect() operation
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* for the UDP socket.
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* - recvfrom() and sendto(). This function is called to set the
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* remote address of the peer.
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*
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* The function will automatically allocate an unused local port for the
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* new connection if the socket is not yet bound to a local address.
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* However, another port can be chosen by using the udp_bind() call,
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* after the udp_connect() function has been called.
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*
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* Input Parameters:
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* conn - A reference to UDP connection structure. A value of NULL will
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* disconnect from any previously connected address.
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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 (indirectly) from user code. Interrupts may
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* be enabled.
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*
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****************************************************************************/
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int udp_connect(FAR struct udp_conn_s *conn,
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FAR const struct sockaddr *addr);
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#if defined(CONFIG_NET_IGMP)
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/****************************************************************************
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* Name: udp_leavegroup
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*
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* Description:
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* This function leaves the multicast group to which the conn belongs.
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*
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* Input Parameters:
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* conn - A reference to UDP connection structure. A value of NULL will
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* disconnect from any previously connected address.
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*
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* Assumptions:
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* This function is called (indirectly) from user code. Interrupts may
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* be enabled.
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*
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****************************************************************************/
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void udp_leavegroup(FAR struct udp_conn_s *conn);
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#else
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#define udp_leavegroup(c)
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#endif
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/****************************************************************************
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* Name: udp_close
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*
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* Description:
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* Break any current UDP connection
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*
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* Input Parameters:
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* psock - An instance of the internal socket structure.
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*
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* Assumptions:
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* Called from normal user-level logic
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*
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****************************************************************************/
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int udp_close(FAR struct socket *psock);
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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: psock_udp_cansend
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*
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* Description:
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* psock_udp_cansend() returns a value indicating if a write to the socket
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* would block. It is still possible that the write may block if another
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* write occurs first.
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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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*
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* Returned Value:
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* -ENOSYS (Function not implemented, always have to wait to send).
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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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int psock_udp_cansend(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_setsockopt
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*
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* Description:
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* udp_setsockopt() sets the UDP-protocol option specified by the
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* 'option' argument to the value pointed to by the 'value' argument for
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* the socket specified by the 'psock' argument.
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*
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* See <netinet/udp.h> for the a complete list of values of UDP protocol
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* options.
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*
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* Input Parameters:
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* psock Socket structure of socket to operate on
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* option identifies the option to set
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* value Points to the argument value
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* value_len The length of the argument value
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*
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* Returned Value:
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* Returns zero (OK) on success. On failure, it returns a negated errno
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* value to indicate the nature of the error. See psock_setcockopt() for
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* the list of possible error values.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDPPROTO_OPTIONS
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int udp_setsockopt(FAR struct socket *psock, int option,
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FAR const void *value, socklen_t value_len);
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#endif
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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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/****************************************************************************
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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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/****************************************************************************
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* Name: udp_wrbuffer_timedalloc
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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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* This function is wrapped version of udp_wrbuffer_alloc(),
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* this wait will be terminated when the specified timeout expires.
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*
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* Input Parameters:
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* timeout - The relative time to wait until a timeout is declared.
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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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FAR struct udp_wrbuffer_s *udp_wrbuffer_timedalloc(unsigned int timeout);
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
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|
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/****************************************************************************
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* Name: udp_wrbuffer_tryalloc
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*
|
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* Description:
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* Try to 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 be sent if the socket is non-blocking. Returns
|
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* immediately if allocation fails.
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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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#ifdef CONFIG_NET_JUMBO_FRAME
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FAR struct udp_wrbuffer_s *udp_wrbuffer_tryalloc(int len);
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#else
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FAR struct udp_wrbuffer_s *udp_wrbuffer_tryalloc(void);
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#endif
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS */
|
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|
|
/****************************************************************************
|
|
* Name: udp_wrbuffer_release
|
|
*
|
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* Description:
|
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* 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 */
|