1226 lines
40 KiB
C
1226 lines
40 KiB
C
/****************************************************************************
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* net/tcp/tcp.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_TCP_TCP_H
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#define _NET_TCP_TCP_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/iob.h>
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#include <nuttx/net/ip.h>
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#ifdef CONFIG_NET_TCP
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Conditions for support TCP poll/select operations */
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#if !defined(CONFIG_DISABLE_POLL) && CONFIG_NSOCKET_DESCRIPTORS > 0 && \
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defined(CONFIG_NET_TCP_READAHEAD)
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# define HAVE_TCP_POLL
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#endif
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/* Allocate a new TCP data callback */
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#ifdef CONFIG_NETDEV_MULTINIC
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/* These macros allocate and free callback structures used for receiving
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* notifications of TCP data-related events.
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*/
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# define tcp_callback_alloc(conn) \
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devif_callback_alloc(conn->dev, &conn->list)
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# define tcp_callback_free(conn,cb) \
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devif_conn_callback_free(conn->dev, cb, &conn->list)
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/* These macros allocate and free callback structures used for receiving
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* notifications of device-related events.
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*/
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# define tcp_monitor_callback_alloc(conn) \
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devif_callback_alloc(conn->dev, NULL)
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# define tcp_monitor_callback_free(conn,cb) \
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devif_conn_callback_free(conn->dev, cb, NULL)
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#else
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/* These macros allocate and free callback structures used for receiving
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* notifications of TCP data-related events.
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*/
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# define tcp_callback_alloc(conn) \
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devif_callback_alloc(g_netdevices, &conn->list)
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# define tcp_callback_free(conn,cb) \
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devif_conn_callback_free(g_netdevices, cb, &conn->list)
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/* These macros allocate and free callback structures used for receiving
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* notifications of device-related events.
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*/
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# define tcp_monitor_callback_alloc(conn) \
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devif_callback_alloc(g_netdevices, NULL)
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# define tcp_monitor_callback_free(conn,cb) \
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devif_conn_callback_free(g_netdevices, cb, NULL)
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#endif
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/* Get the current maximum segment size that can be sent on the current
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* TCP connection.
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*/
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#define tcp_mss(conn) ((conn)->mss)
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#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
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/* TCP write buffer access macros */
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# define WRB_SEQNO(wrb) ((wrb)->wb_seqno)
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# define WRB_PKTLEN(wrb) ((wrb)->wb_iob->io_pktlen)
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# define WRB_SENT(wrb) ((wrb)->wb_sent)
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# define WRB_NRTX(wrb) ((wrb)->wb_nrtx)
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# define WRB_IOB(wrb) ((wrb)->wb_iob)
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# define WRB_COPYOUT(wrb,dest,n) (iob_copyout(dest,(wrb)->wb_iob,(n),0))
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# define WRB_COPYIN(wrb,src,n) (iob_copyin((wrb)->wb_iob,src,(n),0,false))
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# define WRB_TRIM(wrb,n) \
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do { (wrb)->wb_iob = iob_trimhead((wrb)->wb_iob,(n)); } while (0)
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#ifdef CONFIG_DEBUG
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# define WRB_DUMP(msg,wrb,len,offset) \
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tcp_wrbuffer_dump(msg,wrb,len,offset)
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#else
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# define WRB_DUMP(msg,wrb,len,offset)
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#endif
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#endif
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* Representation of a TCP connection.
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*
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* The tcp_conn_s structure is used for identifying a connection. All
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* but one field in the structure are to be considered read-only by an
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* application. The only exception is the 'private' fields whose purpose
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* is to let the application store application-specific state (e.g.,
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* file pointers) for the connection.
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*/
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struct net_driver_s; /* Forward reference */
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struct devif_callback_s; /* Forward reference */
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struct tcp_backlog_s; /* Forward reference */
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struct tcp_hdr_s; /* Forward reference */
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struct tcp_conn_s
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{
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dq_entry_t node; /* Implements a doubly linked list */
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union ip_binding_u u; /* IP address binding */
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uint8_t rcvseq[4]; /* The sequence number that we expect to
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* receive next */
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uint8_t sndseq[4]; /* The sequence number that was last sent by us */
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uint8_t crefs; /* Reference counts on this instance */
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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uint8_t domain; /* IP domain: PF_INET or PF_INET6 */
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#endif
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uint8_t sa; /* Retransmission time-out calculation state
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* variable */
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uint8_t sv; /* Retransmission time-out calculation state
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* variable */
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uint8_t rto; /* Retransmission time-out */
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uint8_t tcpstateflags; /* TCP state and flags */
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uint8_t timer; /* The retransmission timer (units: half-seconds) */
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uint8_t nrtx; /* The number of retransmissions for the last
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* segment sent */
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uint16_t lport; /* The local TCP port, in network byte order */
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uint16_t rport; /* The remoteTCP port, in network byte order */
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uint16_t mss; /* Current maximum segment size for the
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* connection */
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uint16_t winsize; /* Current window size of the connection */
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#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
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uint32_t unacked; /* Number bytes sent but not yet ACKed */
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#else
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uint16_t unacked; /* Number bytes sent but not yet ACKed */
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#endif
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#ifdef CONFIG_NETDEV_MULTINIC
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/* If the TCP socket is bound to a local address, then this is
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* a reference to the device that routes traffic on the corresponding
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* network.
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*/
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FAR struct net_driver_s *dev;
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#endif
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#ifdef CONFIG_NET_TCP_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 TCP/IP read-ahead data is retained.
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*/
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struct iob_queue_s readahead; /* Read-ahead buffering */
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#endif
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#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
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/* Write buffering
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*
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* write_q - The queue of unsent I/O buffers. The head of this
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* list may be partially sent. FIFO ordering.
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* unacked_q - A queue of completely sent, but unacked I/O buffer
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* chains. Sequence number ordering.
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*/
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sq_queue_t write_q; /* Write buffering for segments */
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sq_queue_t unacked_q; /* Write buffering for un-ACKed segments */
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uint16_t expired; /* Number segments retransmitted but not yet ACKed,
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* it can only be updated at TCP_ESTABLISHED state */
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uint32_t sent; /* The number of bytes sent (ACKed and un-ACKed) */
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uint32_t isn; /* Initial sequence number */
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#endif
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#ifdef CONFIG_NET_TCPBACKLOG
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/* Listen backlog support
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*
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* blparent - The backlog parent. If this connection is backlogged,
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* this field will be non-null and will refer to the TCP connection
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* structure in which this connection is backlogged.
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* backlog - The pending connection backlog. If this connection is
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* configured as a listener with backlog, then this refers to the
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* struct tcp_backlog_s tear-off structure that manages that backlog.
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*/
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FAR struct tcp_conn_s *blparent;
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FAR struct tcp_backlog_s *backlog;
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#endif
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/* Application callbacks:
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*
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* Data transfer events are retained in 'list'. Event handlers in 'list'
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* are called for events specified in the flags set within struct
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* devif_callback_s
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*
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* When an callback is executed from 'list', the input flags are normally
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* returned, however, the implementation may set one of the following:
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*
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* TCP_CLOSE - Gracefully close the current connection
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* TCP_ABORT - Abort (reset) the current connection on an error that
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* prevents TCP_CLOSE from working.
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*
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* And/Or set/clear the following:
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*
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* TCP_NEWDATA - May be cleared to indicate that the data was consumed
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* and that no further process of the new data should be
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* attempted.
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* TCP_SNDACK - If TCP_NEWDATA is cleared, then TCP_SNDACK may be set
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* to indicate that an ACK should be included in the response.
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* (In TCP_NEWDATA is cleared bu TCP_SNDACK is not set, then
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* dev->d_len should also be cleared).
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*/
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FAR struct devif_callback_s *list;
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/* accept() is called when the TCP logic has created a connection
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*
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* accept_private: This is private data that will be available to the
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* accept() handler when it is invoked with a point to this structure
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* as an argument.
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* accept: This is the the pointer to the accept handler.
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*/
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FAR void *accept_private;
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int (*accept)(FAR struct tcp_conn_s *listener, FAR struct tcp_conn_s *conn);
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/* connection_event() is called on any of the subset of connection-related
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* events.
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*
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* connection_private: This is private data that will be available to
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* the connection_event() handler when it is invoked with a point to
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* this structure as an argument.
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* connection_devcb: this is the allocated callback structure that is
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* used to
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* connection_event: This is the the pointer to the connection event
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* handler.
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*/
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FAR void *connection_private;
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FAR struct devif_callback_s *connection_devcb;
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uint16_t (*connection_event)(FAR struct net_driver_s *dev,
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FAR void *pvconn, FAR void *pvpriv,
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uint16_t flags);
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};
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/* This structure supports TCP write buffering */
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#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
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struct tcp_wrbuffer_s
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{
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sq_entry_t wb_node; /* Supports a singly linked list */
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uint32_t wb_seqno; /* Sequence number of the write segment */
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uint16_t wb_sent; /* Number of bytes sent from the I/O buffer chain */
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uint8_t wb_nrtx; /* The number of retransmissions for the last
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* segment sent */
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struct iob_s *wb_iob; /* Head of the I/O buffer chain */
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};
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#endif
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/* Support for listen backlog:
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*
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* struct tcp_blcontainer_s describes one backlogged connection
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* struct tcp_backlog_s is a "tear-off" describing all backlog for a
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* listener connection
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*/
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#ifdef CONFIG_NET_TCPBACKLOG
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struct tcp_blcontainer_s
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{
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sq_entry_t bc_node; /* Implements a singly linked list */
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FAR struct tcp_conn_s *bc_conn; /* Holds reference to the new connection structure */
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};
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struct tcp_backlog_s
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{
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sq_queue_t bl_free; /* Implements a singly-linked list of free containers */
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sq_queue_t bl_pending; /* Implements a singly-linked list of pending connections */
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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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#if CONFIG_NSOCKET_DESCRIPTORS > 0
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/* List of registered Ethernet device drivers. You must have the network
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* locked in order to access this list.
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*
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* NOTE that this duplicates a declaration in net/netdev/netdev.h
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*/
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EXTERN struct net_driver_s *g_netdevices;
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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 pollfd; /* Forward reference */
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/****************************************************************************
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* Name: tcp_initialize
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*
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* Description:
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* Initialize the TCP/IP connection structures. Called only once and only
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* from the UIP layer at start-up in normal user mode.
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*
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****************************************************************************/
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void tcp_initialize(void);
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/****************************************************************************
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* Name: tcp_alloc
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*
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* Description:
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* Find a free TCP/IP connection structure and allocate it
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* for use. This is normally something done by the implementation of the
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* socket() API but is also called from the driver level when a TCP
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* packet is received while "listening"
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*
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****************************************************************************/
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FAR struct tcp_conn_s *tcp_alloc(uint8_t domain);
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/****************************************************************************
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* Name: tcp_free
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*
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* Description:
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* Free a 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 tcp_free(FAR struct tcp_conn_s *conn);
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/****************************************************************************
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* Name: tcp_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 with the provided TCP/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 tcp_conn_s *tcp_active(FAR struct net_driver_s *dev,
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FAR struct tcp_hdr_s *tcp);
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/****************************************************************************
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* Name: tcp_nextconn
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*
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* Description:
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* Traverse the list of active TCP 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 tcp_conn_s *tcp_nextconn(FAR struct tcp_conn_s *conn);
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/****************************************************************************
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* Function: tcp_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 TCP transaction.
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*
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* Input Parameters:
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* conn - TCP connection structure. The locally bound address, laddr,
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* should be set to a non-zero value in this structure.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned
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* on failure. -ENODEV is the only expected error value.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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int tcp_find_ipv4_device(FAR struct tcp_conn_s *conn);
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#endif
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/****************************************************************************
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* Function: tcp_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 TCP transaction.
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*
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* Input Parameters:
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* conn - TCP connection structure. The locally bound address, laddr,
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* should be set to a non-zero value in this structure.
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*
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* Returned Value:
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* Zero (OK) is returned on success. A negated errno value is returned
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* on failure. -EHOSTUNREACH is the only expected error value.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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int tcp_find_ipv6_device(FAR struct tcp_conn_s *conn);
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#endif
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/****************************************************************************
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* Name: tcp_alloc_accept
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*
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* Description:
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* Called when driver processing matches the incoming packet with a
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* connection in LISTEN. In that case, this function will create a new
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* connection and initialize it to send a SYNACK in return.
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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 tcp_conn_s *tcp_alloc_accept(FAR struct net_driver_s *dev,
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FAR struct tcp_hdr_s *tcp);
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|
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/****************************************************************************
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* Name: tcp_bind
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*
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* Description:
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* This function implements the lower level parts of the standard TCP
|
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* bind() operation.
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*
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* Return:
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* 0 on success or -EADDRINUSE on failure
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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 tcp_bind(FAR struct tcp_conn_s *conn, FAR const struct sockaddr *addr);
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|
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/****************************************************************************
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* Name: tcp_connect
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*
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|
* Description:
|
|
* This function implements the lower level parts of the standard
|
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* TCP connect() operation: It connects to a remote host using TCP.
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|
*
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|
* This function is used to start a new connection to the specified
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|
* port on the specified host. It uses the connection structure that was
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* allocated by a preceding socket() call. It sets the connection to
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* the SYN_SENT state and sets the retransmission timer to 0. This will
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* cause a TCP SYN segment to be sent out the next time this connection
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* is periodically processed, which usually is done within 0.5 seconds
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* after the call to tcp_connect().
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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 tcp_connect(FAR struct tcp_conn_s *conn, FAR const struct sockaddr *addr);
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|
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/****************************************************************************
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|
* Function: tcp_ipv4_select
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|
*
|
|
* Description:
|
|
* Configure to send or receive an TCP IPv4 packet
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*
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|
****************************************************************************/
|
|
|
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#ifdef CONFIG_NET_IPv4
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void tcp_ipv4_select(FAR struct net_driver_s *dev);
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#endif
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|
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/****************************************************************************
|
|
* Function: tcp_ipv6_select
|
|
*
|
|
* Description:
|
|
* Configure to send or receive an TCP IPv6 packet
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
void tcp_ipv6_select(FAR struct net_driver_s *dev);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_setsequence
|
|
*
|
|
* Description:
|
|
* Set the TCP/IP sequence number
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_setsequence(FAR uint8_t *seqno, uint32_t value);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_getsequence
|
|
*
|
|
* Description:
|
|
* Get the TCP/IP sequence number
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint32_t tcp_getsequence(FAR uint8_t *seqno);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_addsequence
|
|
*
|
|
* Description:
|
|
* Add the length to get the next TCP sequence number.
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint32_t tcp_addsequence(FAR uint8_t *seqno, uint16_t len);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_initsequence
|
|
*
|
|
* Description:
|
|
* Set the (initial) the TCP/IP sequence number when a TCP connection is
|
|
* established.
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_initsequence(FAR uint8_t *seqno);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_nextsequence
|
|
*
|
|
* Description:
|
|
* Increment the TCP/IP sequence number
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_nextsequence(void);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_poll
|
|
*
|
|
* Description:
|
|
* Poll a TCP connection structure for availability of TX data
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The TCP "connection" to poll for TX data
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_poll(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_timer
|
|
*
|
|
* Description:
|
|
* Handle a TCP timer expiration for the provided TCP connection
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The TCP "connection" to poll for TX data
|
|
* hsed - The polling interval in halves of a second
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_timer(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
|
|
int hsec);
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_listen_initialize
|
|
*
|
|
* Description:
|
|
* Setup the listening data structures
|
|
*
|
|
* Assumptions:
|
|
* Called early in the initialization phase while the system is still
|
|
* single-threaded.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_listen_initialize(void);
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_unlisten
|
|
*
|
|
* Description:
|
|
* Stop listening to the port bound to the specified TCP connection
|
|
*
|
|
* Assumptions:
|
|
* Called from normal user code.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_unlisten(FAR struct tcp_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_listen
|
|
*
|
|
* Description:
|
|
* Start listening to the port bound to the specified TCP connection
|
|
*
|
|
* Assumptions:
|
|
* Called from normal user code.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_listen(FAR struct tcp_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_islistener
|
|
*
|
|
* Description:
|
|
* Return true is there is a listener for the specified port
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
bool tcp_islistener(uint16_t portno);
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_accept_connection
|
|
*
|
|
* Description:
|
|
* Accept the new connection for the specified listening port.
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_accept_connection(FAR struct net_driver_s *dev,
|
|
FAR struct tcp_conn_s *conn, uint16_t portno);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_send
|
|
*
|
|
* Description:
|
|
* Setup to send a TCP packet
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The TCP connection structure holding connection information
|
|
* flags - flags to apply to the TCP header
|
|
* len - length of the message
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_send(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
|
|
uint16_t flags, uint16_t len);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_reset
|
|
*
|
|
* Description:
|
|
* Send a TCP reset (no-data) message
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_reset(FAR struct net_driver_s *dev);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_ack
|
|
*
|
|
* Description:
|
|
* Send the SYN or SYNACK response.
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The TCP connection structure holding connection information
|
|
* ack - The ACK response to send
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_ack(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
|
|
uint8_t ack);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_appsend
|
|
*
|
|
* Description:
|
|
* Handle application or TCP protocol response. If this function is called
|
|
* with dev->d_sndlen > 0, then this is an application attempting to send
|
|
* packet.
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The TCP connection structure holding connection information
|
|
* result - App result event sent
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_appsend(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
|
|
uint16_t result);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_rexmit
|
|
*
|
|
* Description:
|
|
* Handle application retransmission
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The TCP connection structure holding connection information
|
|
* result - App result event sent
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_rexmit(FAR struct net_driver_s *dev, FAR struct tcp_conn_s *conn,
|
|
uint16_t result);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_ipv4_input
|
|
*
|
|
* Description:
|
|
* Handle incoming TCP input with IPv4 header
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure containing the received TCP packet.
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from the Ethernet driver with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
void tcp_ipv4_input(FAR struct net_driver_s *dev);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_ipv6_input
|
|
*
|
|
* Description:
|
|
* Handle incoming TCP input with IPv4 header
|
|
*
|
|
* Parameters:
|
|
* dev - The device driver structure containing the received TCP packet.
|
|
*
|
|
* Return:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from the Ethernet driver with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
void tcp_ipv6_input(FAR struct net_driver_s *dev);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_callback
|
|
*
|
|
* Description:
|
|
* Inform the application holding the TCP socket of a change in state.
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint16_t tcp_callback(FAR struct net_driver_s *dev,
|
|
FAR struct tcp_conn_s *conn, uint16_t flags);
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_datahandler
|
|
*
|
|
* Description:
|
|
* Handle data that is not accepted by the application. This may be called
|
|
* either (1) from the data receive logic if it cannot buffer the data, or
|
|
* (2) from the TCP event logic is there is no listener in place ready to
|
|
* receive the data.
|
|
*
|
|
* Input Parameters:
|
|
* conn - A pointer to the TCP connection structure
|
|
* buffer - A pointer to the buffer to be copied to the read-ahead
|
|
* buffers
|
|
* buflen - The number of bytes to copy to the read-ahead buffer.
|
|
*
|
|
* Returned value:
|
|
* The number of bytes actually buffered is returned. This will be either
|
|
* zero or equal to buflen; partial packets are not buffered.
|
|
*
|
|
* Assumptions:
|
|
* - The caller has checked that TCP_NEWDATA is set in flags and that is no
|
|
* other handler available to process the incoming data.
|
|
* - Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_READAHEAD
|
|
uint16_t tcp_datahandler(FAR struct tcp_conn_s *conn, FAR uint8_t *buffer,
|
|
uint16_t nbytes);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_backlogcreate
|
|
*
|
|
* Description:
|
|
* Called from the listen() logic to setup the backlog as specified in the
|
|
* the listen arguments.
|
|
*
|
|
* Assumptions:
|
|
* Called from normal user code. Interrupts may be disabled.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
int tcp_backlogcreate(FAR struct tcp_conn_s *conn, int nblg);
|
|
#else
|
|
# define tcp_backlogcreate(c,n) (-ENOSYS)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_backlogdestroy
|
|
*
|
|
* Description:
|
|
* (1) Called from tcp_free() whenever a connection is freed.
|
|
* (2) Called from tcp_backlogcreate() to destroy any old backlog
|
|
*
|
|
* NOTE: This function may re-enter tcp_free when a connection that
|
|
* is freed that has pending connections.
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
int tcp_backlogdestroy(FAR struct tcp_conn_s *conn);
|
|
#else
|
|
# define tcp_backlogdestroy(conn) (-ENOSYS)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_backlogadd
|
|
*
|
|
* Description:
|
|
* Called tcp_listen when a new connection is made with a listener socket
|
|
* but when there is no accept() in place to receive the connection. This
|
|
* function adds the new connection to the backlog.
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
int tcp_backlogadd(FAR struct tcp_conn_s *conn,
|
|
FAR struct tcp_conn_s *blconn);
|
|
#else
|
|
# define tcp_backlogadd(conn,blconn) (-ENOSYS)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_backlogavailable
|
|
*
|
|
* Description:
|
|
* Called from poll(). Before waiting for a new connection, poll will
|
|
* call this API to see if there are pending connections in the backlog.
|
|
*
|
|
* Assumptions:
|
|
* Called from normal user code, but with interrupts disabled,
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_NET_TCPBACKLOG) && !defined(CONFIG_DISABLE_POLL)
|
|
bool tcp_backlogavailable(FAR struct tcp_conn_s *conn);
|
|
#else
|
|
# define tcp_backlogavailable(c) (false);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_backlogremove
|
|
*
|
|
* Description:
|
|
* Called from accept(). Before waiting for a new connection, accept will
|
|
* call this API to see if there are pending connections in the backlog.
|
|
*
|
|
* Assumptions:
|
|
* Called from normal user code, but with interrupts disabled,
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
FAR struct tcp_conn_s *tcp_backlogremove(FAR struct tcp_conn_s *conn);
|
|
#else
|
|
# define tcp_backlogremove(c) (NULL)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_backlogdelete
|
|
*
|
|
* Description:
|
|
* Called from tcp_free() when a connection is freed that this also
|
|
* retained in the pending connection list of a listener. We simply need
|
|
* to remove the defunct connection from the list.
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
int tcp_backlogdelete(FAR struct tcp_conn_s *conn,
|
|
FAR struct tcp_conn_s *blconn);
|
|
#else
|
|
# define tcp_backlogdelete(c,b) (-ENOSYS)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_accept
|
|
*
|
|
* Description:
|
|
* This function implements accept() for TCP/IP sockets. See the
|
|
* description of accept() for further information.
|
|
*
|
|
* Parameters:
|
|
* psock The listening TCP socket structure
|
|
* addr Receives the address of the connecting client
|
|
* addrlen Input: allocated size of 'addr', Return: returned size of 'addr'
|
|
* newconn The new, accepted TCP connection structure
|
|
*
|
|
* Returned Value:
|
|
* Returns zero (OK) on success or a negated errno value on failure.
|
|
* See the description of accept of the possible errno values in the
|
|
* description of accept().
|
|
*
|
|
* Assumptions:
|
|
* Network is locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int psock_tcp_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
|
|
FAR socklen_t *addrlen, FAR void **newconn);
|
|
|
|
/****************************************************************************
|
|
* Function: psock_tcp_send
|
|
*
|
|
* Description:
|
|
* The psock_tcp_send() call may be used only when the TCP socket is in a
|
|
* connected state (so that the intended recipient is known).
|
|
*
|
|
* Parameters:
|
|
* psock An instance of the internal socket structure.
|
|
* buf Data to send
|
|
* len Length of data to send
|
|
*
|
|
* Returned Value:
|
|
* On success, returns the number of characters sent. On error,
|
|
* -1 is returned, and errno is set appropriately:
|
|
*
|
|
* EAGAIN or EWOULDBLOCK
|
|
* The socket is marked non-blocking and the requested operation
|
|
* would block.
|
|
* EBADF
|
|
* An invalid descriptor was specified.
|
|
* ECONNRESET
|
|
* Connection reset by peer.
|
|
* EDESTADDRREQ
|
|
* The socket is not connection-mode, and no peer address is set.
|
|
* EFAULT
|
|
* An invalid user space address was specified for a parameter.
|
|
* EINTR
|
|
* A signal occurred before any data was transmitted.
|
|
* EINVAL
|
|
* Invalid argument passed.
|
|
* EISCONN
|
|
* The connection-mode socket was connected already but a recipient
|
|
* was specified. (Now either this error is returned, or the recipient
|
|
* specification is ignored.)
|
|
* EMSGSIZE
|
|
* The socket type requires that message be sent atomically, and the
|
|
* size of the message to be sent made this impossible.
|
|
* ENOBUFS
|
|
* The output queue for a network interface was full. This generally
|
|
* indicates that the interface has stopped sending, but may be
|
|
* caused by transient congestion.
|
|
* ENOMEM
|
|
* No memory available.
|
|
* ENOTCONN
|
|
* The socket is not connected, and no target has been given.
|
|
* ENOTSOCK
|
|
* The argument s is not a socket.
|
|
* EPIPE
|
|
* The local end has been shut down on a connection oriented socket.
|
|
* In this case the process will also receive a SIGPIPE unless
|
|
* MSG_NOSIGNAL is set.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
struct socket;
|
|
ssize_t psock_tcp_send(FAR struct socket *psock, FAR const void *buf,
|
|
size_t len);
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_wrbuffer_initialize
|
|
*
|
|
* Description:
|
|
* Initialize the list of free write buffers
|
|
*
|
|
* Assumptions:
|
|
* Called once early initialization.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
void tcp_wrbuffer_initialize(void);
|
|
#endif /* CONFIG_NET_TCP_WRITE_BUFFERS */
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_wrbuffer_alloc
|
|
*
|
|
* Description:
|
|
* Allocate a TCP write buffer by taking a pre-allocated buffer from
|
|
* the free list. This function is called from TCP logic when a buffer
|
|
* of TCP data is about to sent
|
|
*
|
|
* Input parameters:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from user logic with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
struct tcp_wrbuffer_s;
|
|
|
|
FAR struct tcp_wrbuffer_s *tcp_wrbuffer_alloc(void);
|
|
#endif /* CONFIG_NET_TCP_WRITE_BUFFERS */
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_wrbuffer_release
|
|
*
|
|
* Description:
|
|
* Release a TCP 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_TCP_WRITE_BUFFERS
|
|
void tcp_wrbuffer_release(FAR struct tcp_wrbuffer_s *wrb);
|
|
#endif /* CONFIG_NET_TCP_WRITE_BUFFERS */
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_wrbuffer_dump
|
|
*
|
|
* Description:
|
|
* Dump the contents of a write buffer.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
#ifdef CONFIG_DEBUG
|
|
void tcp_wrbuffer_dump(FAR const char *msg, FAR struct tcp_wrbuffer_s *wrb,
|
|
unsigned int len, unsigned int offset);
|
|
#else
|
|
# define tcp_wrbuffer_dump(msg,wrb)
|
|
#endif
|
|
#endif /* CONFIG_NET_TCP_WRITE_BUFFERS */
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_pollsetup
|
|
*
|
|
* Description:
|
|
* Setup to monitor events on one TCP/IP socket
|
|
*
|
|
* Input Parameters:
|
|
* psock - The TCP/IP socket of interest
|
|
* fds - The structure describing the events to be monitored, OR NULL if
|
|
* this is a request to stop monitoring events.
|
|
*
|
|
* Returned Value:
|
|
* 0: Success; Negated errno on failure
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef HAVE_TCP_POLL
|
|
int tcp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: tcp_pollteardown
|
|
*
|
|
* Description:
|
|
* Teardown monitoring of events on an TCP/IP socket
|
|
*
|
|
* Input Parameters:
|
|
* psock - The TCP/IP socket of interest
|
|
* fds - The structure describing the events to be monitored, OR NULL if
|
|
* this is a request to stop monitoring events.
|
|
*
|
|
* Returned Value:
|
|
* 0: Success; Negated errno on failure
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef HAVE_TCP_POLL
|
|
int tcp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
#endif
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_NET_TCP */
|
|
#endif /* _NET_TCP_TCP_H */
|