83745652c4
Fixes an issue where tcp sockets with activated keepalives stalled and were not properly closed. Poll would not indicate a POLLHUP and therefore locks down the application. * tcp_conn_s.tcp_conn_s & tcp_conn_s.keepintvl changed to uint32_t According RFC1122 keepidle MUST have a default of 2 hours.
1826 lines
62 KiB
C
1826 lines
62 KiB
C
/****************************************************************************
|
|
* net/tcp/tcp.h
|
|
*
|
|
* Copyright (C) 2014-2016, 2018-2019 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef _NET_TCP_TCP_H
|
|
#define _NET_TCP_TCP_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <queue.h>
|
|
|
|
#include <nuttx/clock.h>
|
|
#include <nuttx/mm/iob.h>
|
|
#include <nuttx/net/ip.h>
|
|
|
|
#ifdef CONFIG_NET_TCP_NOTIFIER
|
|
# include <nuttx/wqueue.h>
|
|
#endif
|
|
|
|
#if defined(CONFIG_NET_TCP) && !defined(CONFIG_NET_TCP_NO_STACK)
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#define NET_TCP_HAVE_STACK 1
|
|
|
|
/* Allocate a new TCP data callback */
|
|
|
|
/* These macros allocate and free callback structures used for receiving
|
|
* notifications of TCP data-related events.
|
|
*/
|
|
|
|
#define tcp_callback_alloc(conn) \
|
|
devif_callback_alloc((conn)->dev, &(conn)->list)
|
|
#define tcp_callback_free(conn,cb) \
|
|
devif_conn_callback_free((conn)->dev, (cb), &(conn)->list)
|
|
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
/* TCP write buffer access macros */
|
|
|
|
# define TCP_WBSEQNO(wrb) ((wrb)->wb_seqno)
|
|
# define TCP_WBPKTLEN(wrb) ((wrb)->wb_iob->io_pktlen)
|
|
# define TCP_WBSENT(wrb) ((wrb)->wb_sent)
|
|
# define TCP_WBNRTX(wrb) ((wrb)->wb_nrtx)
|
|
# define TCP_WBIOB(wrb) ((wrb)->wb_iob)
|
|
# define TCP_WBCOPYOUT(wrb,dest,n) (iob_copyout(dest,(wrb)->wb_iob,(n),0))
|
|
# define TCP_WBCOPYIN(wrb,src,n) \
|
|
(iob_copyin((wrb)->wb_iob,src,(n),0,false,\
|
|
IOBUSER_NET_TCP_WRITEBUFFER))
|
|
# define TCP_WBTRYCOPYIN(wrb,src,n) \
|
|
(iob_trycopyin((wrb)->wb_iob,src,(n),0,false,\
|
|
IOBUSER_NET_TCP_WRITEBUFFER))
|
|
|
|
# define TCP_WBTRIM(wrb,n) \
|
|
do { (wrb)->wb_iob = iob_trimhead((wrb)->wb_iob,(n),\
|
|
IOBUSER_NET_TCP_WRITEBUFFER); } while (0)
|
|
|
|
#ifdef CONFIG_DEBUG_FEATURES
|
|
# define TCP_WBDUMP(msg,wrb,len,offset) \
|
|
tcp_wrbuffer_dump(msg,wrb,len,offset)
|
|
# else
|
|
# define TCP_WBDUMP(msg,wrb,len,offset)
|
|
# endif
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Type Definitions
|
|
****************************************************************************/
|
|
|
|
struct file; /* Forward reference */
|
|
struct sockaddr; /* Forward reference */
|
|
struct socket; /* Forward reference */
|
|
struct pollfd; /* Forward reference */
|
|
|
|
/* Representation of a TCP connection.
|
|
*
|
|
* The tcp_conn_s structure is used for identifying a connection. All
|
|
* but one field in the structure are to be considered read-only by an
|
|
* application. The only exception is the 'private' fields whose purpose
|
|
* is to let the application store application-specific state (e.g.,
|
|
* file pointers) for the connection.
|
|
*/
|
|
|
|
struct net_driver_s; /* Forward reference */
|
|
struct devif_callback_s; /* Forward reference */
|
|
struct tcp_backlog_s; /* Forward reference */
|
|
struct tcp_hdr_s; /* Forward reference */
|
|
|
|
/* This is a container that holds the poll-related information */
|
|
|
|
struct tcp_poll_s
|
|
{
|
|
FAR struct socket *psock; /* Needed to handle loss of connection */
|
|
struct pollfd *fds; /* Needed to handle poll events */
|
|
FAR struct devif_callback_s *cb; /* Needed to teardown the poll */
|
|
};
|
|
|
|
struct tcp_conn_s
|
|
{
|
|
/* Common prologue of all connection structures. */
|
|
|
|
dq_entry_t node; /* Implements a doubly linked list */
|
|
|
|
/* TCP callbacks:
|
|
*
|
|
* Data transfer events are retained in 'list'. Event handlers in 'list'
|
|
* are called for events specified in the flags set within struct
|
|
* devif_callback_s
|
|
*
|
|
* When an callback is executed from 'list', the input flags are normally
|
|
* returned, however, the implementation may set one of the following:
|
|
*
|
|
* TCP_CLOSE - Gracefully close the current connection
|
|
* TCP_ABORT - Abort (reset) the current connection on an error that
|
|
* prevents TCP_CLOSE from working.
|
|
*
|
|
* And/Or set/clear the following:
|
|
*
|
|
* TCP_NEWDATA - May be cleared to indicate that the data was consumed
|
|
* and that no further process of the new data should be
|
|
* attempted.
|
|
* TCP_SNDACK - If TCP_NEWDATA is cleared, then TCP_SNDACK may be set to
|
|
* indicate that an ACK should be included in the response.
|
|
* (In TCP_NEWDATA is cleared bu TCP_SNDACK is not set,
|
|
* then dev->d_len should also be cleared).
|
|
*/
|
|
|
|
FAR struct devif_callback_s *list;
|
|
|
|
/* TCP-specific content follows */
|
|
|
|
union ip_binding_u u; /* IP address binding */
|
|
uint8_t rcvseq[4]; /* The sequence number that we expect to
|
|
* receive next */
|
|
uint8_t sndseq[4]; /* The sequence number that was last sent by us */
|
|
uint8_t crefs; /* Reference counts on this instance */
|
|
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
|
|
uint8_t domain; /* IP domain: PF_INET or PF_INET6 */
|
|
#endif
|
|
uint8_t sa; /* Retransmission time-out calculation state
|
|
* variable */
|
|
uint8_t sv; /* Retransmission time-out calculation state
|
|
* variable */
|
|
uint8_t rto; /* Retransmission time-out */
|
|
uint8_t tcpstateflags; /* TCP state and flags */
|
|
uint8_t timer; /* The retransmission timer (units: half-seconds) */
|
|
uint8_t nrtx; /* The number of retransmissions for the last
|
|
* segment sent */
|
|
#ifdef CONFIG_NET_TCP_DELAYED_ACK
|
|
uint8_t rx_unackseg; /* Number of un-ACKed received segments */
|
|
uint8_t rx_acktimer; /* Time since last ACK sent (units: half-seconds) */
|
|
#endif
|
|
uint16_t lport; /* The local TCP port, in network byte order */
|
|
uint16_t rport; /* The remoteTCP port, in network byte order */
|
|
uint16_t mss; /* Current maximum segment size for the
|
|
* connection */
|
|
uint16_t winsize; /* Current window size of the connection */
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
uint32_t tx_unacked; /* Number bytes sent but not yet ACKed */
|
|
#else
|
|
uint16_t tx_unacked; /* Number bytes sent but not yet ACKed */
|
|
#endif
|
|
|
|
/* If the TCP socket is bound to a local address, then this is
|
|
* a reference to the device that routes traffic on the corresponding
|
|
* network.
|
|
*/
|
|
|
|
FAR struct net_driver_s *dev;
|
|
|
|
/* Read-ahead buffering.
|
|
*
|
|
* readahead - A singly linked list of type struct iob_qentry_s
|
|
* where the TCP/IP read-ahead data is retained.
|
|
*/
|
|
|
|
struct iob_queue_s readahead; /* Read-ahead buffering */
|
|
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
/* Write buffering
|
|
*
|
|
* write_q - The queue of unsent I/O buffers. The head of this
|
|
* list may be partially sent. FIFO ordering.
|
|
* unacked_q - A queue of completely sent, but unacked I/O buffer
|
|
* chains. Sequence number ordering.
|
|
*/
|
|
|
|
sq_queue_t write_q; /* Write buffering for segments */
|
|
sq_queue_t unacked_q; /* Write buffering for un-ACKed segments */
|
|
uint16_t expired; /* Number segments retransmitted but not yet ACKed,
|
|
* it can only be updated at TCP_ESTABLISHED state */
|
|
uint32_t sent; /* The number of bytes sent (ACKed and un-ACKed) */
|
|
uint32_t isn; /* Initial sequence number */
|
|
uint32_t sndseq_max; /* The sequence number of next not-retransmitted
|
|
* segment (next greater sndseq) */
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
/* Listen backlog support
|
|
*
|
|
* blparent - The backlog parent. If this connection is backlogged,
|
|
* this field will be non-null and will refer to the TCP connection
|
|
* structure in which this connection is backlogged.
|
|
* backlog - The pending connection backlog. If this connection is
|
|
* configured as a listener with backlog, then this refers to the
|
|
* struct tcp_backlog_s tear-off structure that manages that backlog.
|
|
*/
|
|
|
|
FAR struct tcp_conn_s *blparent;
|
|
FAR struct tcp_backlog_s *backlog;
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_TCP_KEEPALIVE
|
|
/* There fields manage TCP/IP keep-alive. All times are in units of the
|
|
* system clock tick.
|
|
*/
|
|
|
|
clock_t keeptime; /* Last time that the TCP socket was known to be
|
|
* alive (ACK or data received) OR time that the
|
|
* last probe was sent. */
|
|
uint32_t keepidle; /* Elapsed idle time before first probe sent (dsec) */
|
|
uint32_t keepintvl; /* Interval between probes (dsec) */
|
|
bool keepalive; /* True: KeepAlive enabled; false: disabled */
|
|
uint8_t keepcnt; /* Number of retries before the socket is closed */
|
|
uint8_t keepretries; /* Number of retries attempted */
|
|
#endif
|
|
|
|
/* connevents is a list of callbacks for each socket the uses this
|
|
* connection (there can be more that one in the event that the the socket
|
|
* was dup'ed). It is used with the network monitor to handle
|
|
* asynchronous loss-of-connection events.
|
|
*/
|
|
|
|
FAR struct devif_callback_s *connevents;
|
|
|
|
/* accept() is called when the TCP logic has created a connection
|
|
*
|
|
* accept_private: This is private data that will be available to the
|
|
* accept() handler when it is invoked with a point to this structure
|
|
* as an argument.
|
|
* accept: This is the pointer to the accept handler.
|
|
*/
|
|
|
|
FAR void *accept_private;
|
|
int (*accept)(FAR struct tcp_conn_s *listener,
|
|
FAR struct tcp_conn_s *conn);
|
|
|
|
/* The following is a list of poll structures of threads waiting for
|
|
* socket events.
|
|
*/
|
|
|
|
struct tcp_poll_s pollinfo[CONFIG_NET_TCP_NPOLLWAITERS];
|
|
};
|
|
|
|
/* This structure supports TCP write buffering */
|
|
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
struct tcp_wrbuffer_s
|
|
{
|
|
sq_entry_t wb_node; /* Supports a singly linked list */
|
|
uint32_t wb_seqno; /* Sequence number of the write segment */
|
|
uint16_t wb_sent; /* Number of bytes sent from the I/O buffer chain */
|
|
uint8_t wb_nrtx; /* The number of retransmissions for the last
|
|
* segment sent */
|
|
struct iob_s *wb_iob; /* Head of the I/O buffer chain */
|
|
};
|
|
#endif
|
|
|
|
/* Support for listen backlog:
|
|
*
|
|
* struct tcp_blcontainer_s describes one backlogged connection
|
|
* struct tcp_backlog_s is a "tear-off" describing all backlog for a
|
|
* listener connection
|
|
*/
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
struct tcp_blcontainer_s
|
|
{
|
|
sq_entry_t bc_node; /* Implements a singly linked list */
|
|
FAR struct tcp_conn_s *bc_conn; /* Holds reference to the new connection structure */
|
|
};
|
|
|
|
struct tcp_backlog_s
|
|
{
|
|
sq_queue_t bl_free; /* Implements a singly-linked list of free containers */
|
|
sq_queue_t bl_pending; /* Implements a singly-linked list of pending connections */
|
|
};
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
# define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
# define EXTERN extern
|
|
#endif
|
|
|
|
/* List of registered Ethernet device drivers. You must have the network
|
|
* locked in order to access this list.
|
|
*
|
|
* NOTE that this duplicates a declaration in net/netdev/netdev.h
|
|
*/
|
|
|
|
EXTERN struct net_driver_s *g_netdevices;
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_initialize
|
|
*
|
|
* Description:
|
|
* Initialize the TCP/IP connection structures. Called only once and only
|
|
* from the network layer at start-up.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_initialize(void);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_alloc
|
|
*
|
|
* Description:
|
|
* Find a free TCP/IP connection structure and allocate it
|
|
* for use. This is normally something done by the implementation of the
|
|
* socket() API but is also called from the event processing logic when a
|
|
* TCP packet is received while "listening"
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct tcp_conn_s *tcp_alloc(uint8_t domain);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_free
|
|
*
|
|
* Description:
|
|
* Free a connection structure that is no longer in use. This should be
|
|
* done by the implementation of close()
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_free(FAR struct tcp_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_active
|
|
*
|
|
* Description:
|
|
* Find a connection structure that is the appropriate
|
|
* connection to be used with the provided TCP/IP header
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct tcp_conn_s *tcp_active(FAR struct net_driver_s *dev,
|
|
FAR struct tcp_hdr_s *tcp);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_nextconn
|
|
*
|
|
* Description:
|
|
* Traverse the list of active TCP connections
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct tcp_conn_s *tcp_nextconn(FAR struct tcp_conn_s *conn);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_local_ipv4_device
|
|
*
|
|
* Description:
|
|
* Select the network driver to use with the IPv4 TCP transaction based
|
|
* on the locally bound IPv4 address
|
|
*
|
|
* Input Parameters:
|
|
* conn - TCP connection structure. The locally bound address, laddr,
|
|
* should be set to a non-zero value in this structure.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success. A negated errno value is returned
|
|
* on failure. -ENETUNREACH is the only expected error value.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
int tcp_local_ipv4_device(FAR struct tcp_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_remote_ipv4_device
|
|
*
|
|
* Description:
|
|
* Select the network driver to use with the IPv4 TCP transaction based
|
|
* on the remotely connected IPv4 address
|
|
*
|
|
* Input Parameters:
|
|
* conn - TCP connection structure. The remotely connected address, raddr,
|
|
* should be set to a non-zero value in this structure.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success. A negated errno value is returned
|
|
* on failure. -ENETUNREACH is the only expected error value.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
int tcp_remote_ipv4_device(FAR struct tcp_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_local_ipv6_device
|
|
*
|
|
* Description:
|
|
* Select the network driver to use with the IPv6 TCP transaction based
|
|
* on the locally bound IPv6 address
|
|
*
|
|
* Input Parameters:
|
|
* conn - TCP connection structure. The locally bound address, laddr,
|
|
* should be set to a non-zero value in this structure.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success. A negated errno value is returned
|
|
* on failure. -EHOSTUNREACH is the only expected error value.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
int tcp_local_ipv6_device(FAR struct tcp_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_remote_ipv6_device
|
|
*
|
|
* Description:
|
|
* Select the network driver to use with the IPv6 TCP transaction based
|
|
* on the remotely connected IPv6 address
|
|
*
|
|
* Input Parameters:
|
|
* conn - TCP connection structure. The remotely connected address, raddr,
|
|
* should be set to a non-zero value in this structure.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success. A negated errno value is returned
|
|
* on failure. -EHOSTUNREACH is the only expected error value.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
int tcp_remote_ipv6_device(FAR struct tcp_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_alloc_accept
|
|
*
|
|
* Description:
|
|
* Called when driver processing matches the incoming packet with a
|
|
* connection in LISTEN. In that case, this function will create a new
|
|
* connection and initialize it to send a SYNACK in return.
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct tcp_conn_s *tcp_alloc_accept(FAR struct net_driver_s *dev,
|
|
FAR struct tcp_hdr_s *tcp);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_bind
|
|
*
|
|
* Description:
|
|
* This function implements the lower level parts of the standard TCP
|
|
* bind() operation.
|
|
*
|
|
* Returned Value:
|
|
* 0 on success or -EADDRINUSE on failure
|
|
*
|
|
* Assumptions:
|
|
* This function is called from normal user level code.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_bind(FAR struct tcp_conn_s *conn, FAR const struct sockaddr *addr);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_connect
|
|
*
|
|
* Description:
|
|
* This function implements the lower level parts of the standard
|
|
* TCP connect() operation: It connects to a remote host using TCP.
|
|
*
|
|
* This function is used to start a new connection to the specified
|
|
* port on the specified host. It uses the connection structure that was
|
|
* allocated by a preceding socket() call. It sets the connection to
|
|
* the SYN_SENT state and sets the retransmission timer to 0. This will
|
|
* cause a TCP SYN segment to be sent out the next time this connection
|
|
* is periodically processed, which usually is done within 0.5 seconds
|
|
* after the call to tcp_connect().
|
|
*
|
|
* Assumptions:
|
|
* This function is called from normal user level code.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_connect(FAR struct tcp_conn_s *conn,
|
|
FAR const struct sockaddr *addr);
|
|
|
|
/****************************************************************************
|
|
* Name: psock_tcp_connect
|
|
*
|
|
* Description:
|
|
* Perform a TCP connection
|
|
*
|
|
* Input Parameters:
|
|
* psock - A reference to the structure of the socket to be connected
|
|
* addr - The address of the remote server to connect to
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* The network is locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
int psock_tcp_connect(FAR struct socket *psock,
|
|
FAR const struct sockaddr *addr);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_start_monitor
|
|
*
|
|
* Description:
|
|
* Set up to receive TCP connection state changes for a given socket
|
|
*
|
|
* Input Parameters:
|
|
* psock - The socket of interest
|
|
*
|
|
* Returned Value:
|
|
* On success, tcp_start_monitor returns OK; On any failure,
|
|
* tcp_start_monitor will return a negated errno value. The only failure
|
|
* that can occur is if the socket has already been closed and, in this
|
|
* case, -ENOTCONN is returned.
|
|
*
|
|
* Assumptions:
|
|
* The caller holds the network lock (if not, it will be locked momentarily
|
|
* by this function).
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_start_monitor(FAR struct socket *psock);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_stop_monitor
|
|
*
|
|
* Description:
|
|
* Stop monitoring TCP connection changes for a sockets associated with
|
|
* a given TCP connection structure.
|
|
*
|
|
* Input Parameters:
|
|
* conn - The TCP connection of interest
|
|
* flags Set of disconnection events
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* The caller holds the network lock (if not, it will be locked momentarily
|
|
* by this function).
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_stop_monitor(FAR struct tcp_conn_s *conn, uint16_t flags);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_close_monitor
|
|
*
|
|
* Description:
|
|
* One socket in a group of dup'ed sockets has been closed. We need to
|
|
* selectively terminate just those things that are waiting of events
|
|
* from this specific socket. And also recover any resources that are
|
|
* committed to monitoring this socket.
|
|
*
|
|
* Input Parameters:
|
|
* psock - The TCP socket structure that is closed
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* The caller holds the network lock (if not, it will be locked momentarily
|
|
* by this function).
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_close_monitor(FAR struct socket *psock);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_lost_connection
|
|
*
|
|
* Description:
|
|
* Called when a loss-of-connection event has been detected by network
|
|
* event handling logic. Perform operations like tcp_stop_monitor but
|
|
* (1) explicitly mark this socket and (2) disable further callbacks
|
|
* the event handler.
|
|
*
|
|
* Input Parameters:
|
|
* psock - The TCP socket structure associated.
|
|
* cb - devif callback structure
|
|
* flags - Set of connection events events
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* The caller holds the network lock (if not, it will be locked momentarily
|
|
* by this function).
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_lost_connection(FAR struct socket *psock,
|
|
FAR struct devif_callback_s *cb, uint16_t flags);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_close
|
|
*
|
|
* Description:
|
|
* Break any current TCP connection
|
|
*
|
|
* Input Parameters:
|
|
* psock - An instance of the internal socket structure.
|
|
*
|
|
* Assumptions:
|
|
* Called from normal user-level logic
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_close(FAR struct socket *psock);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_ipv4_select
|
|
*
|
|
* Description:
|
|
* Configure to send or receive an TCP IPv4 packet
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_IPv4
|
|
void tcp_ipv4_select(FAR struct net_driver_s *dev);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: 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
|
|
*
|
|
* Input Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The TCP "connection" to poll for TX data
|
|
*
|
|
* Returned Value:
|
|
* 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
|
|
*
|
|
* Input Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
* conn - The TCP "connection" to poll for TX data
|
|
* hsec - The polling interval in halves of a second
|
|
*
|
|
* Returned Value:
|
|
* 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);
|
|
|
|
/****************************************************************************
|
|
* Name: 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);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_findlistener
|
|
*
|
|
* Description:
|
|
* Return the connection listener for connections on this port (if any)
|
|
*
|
|
* Assumptions:
|
|
* The network is locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
|
|
FAR struct tcp_conn_s *tcp_findlistener(uint16_t portno, uint8_t domain);
|
|
#else
|
|
FAR struct tcp_conn_s *tcp_findlistener(uint16_t portno);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: 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);
|
|
|
|
/****************************************************************************
|
|
* Name: 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);
|
|
|
|
/****************************************************************************
|
|
* Name: 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
|
|
bool tcp_islistener(uint16_t portno, uint8_t domain);
|
|
#else
|
|
bool tcp_islistener(uint16_t portno);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: 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
|
|
*
|
|
* Input 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
|
|
*
|
|
* Returned Value:
|
|
* 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_sendfile
|
|
*
|
|
* Description:
|
|
* The tcp_sendfile() call may be used only when the INET socket is in a
|
|
* connected state (so that the intended recipient is known).
|
|
*
|
|
* Input Parameters:
|
|
* psock An instance of the internal socket structure.
|
|
* buf Data to send
|
|
* len Length of data to send
|
|
* flags Send flags
|
|
*
|
|
* Returned Value:
|
|
* On success, returns the number of characters sent. On error,
|
|
* a negated errno value is returned. See sendfile() for a list
|
|
* appropriate error return values.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_SENDFILE
|
|
ssize_t tcp_sendfile(FAR struct socket *psock, FAR struct file *infile,
|
|
FAR off_t *offset, size_t count);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_reset
|
|
*
|
|
* Description:
|
|
* Send a TCP reset (no-data) message
|
|
*
|
|
* Input Parameters:
|
|
* dev - The device driver structure to use in the send operation
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_reset(FAR struct net_driver_s *dev);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_synack
|
|
*
|
|
* Description:
|
|
* Send the SYN or SYNACK response.
|
|
*
|
|
* Input 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
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from network stack logic with the network stack locked
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_synack(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.
|
|
*
|
|
* Input 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
|
|
*
|
|
* Returned Value:
|
|
* 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
|
|
*
|
|
* Input 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
|
|
*
|
|
* Returned Value:
|
|
* 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
|
|
*
|
|
* Input Parameters:
|
|
* dev - The device driver structure containing the received TCP packet.
|
|
*
|
|
* Returned Value:
|
|
* 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
|
|
*
|
|
* Input Parameters:
|
|
* dev - The device driver structure containing the received TCP 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:
|
|
* 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, unsigned int iplen);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: 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);
|
|
|
|
/****************************************************************************
|
|
* Name: 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint16_t tcp_datahandler(FAR struct tcp_conn_s *conn, FAR uint8_t *buffer,
|
|
uint16_t nbytes);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_backlogcreate
|
|
*
|
|
* Description:
|
|
* Called from the listen() logic to setup the backlog as specified in the
|
|
* the listen arguments.
|
|
*
|
|
* Assumptions:
|
|
* Called from network socket logic. The network may or may not be locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
int tcp_backlogcreate(FAR struct tcp_conn_s *conn, int nblg);
|
|
#else
|
|
# define tcp_backlogcreate(c,n) (-ENOSYS)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: 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 socket 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
|
|
|
|
/****************************************************************************
|
|
* Name: 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
|
|
|
|
/****************************************************************************
|
|
* Name: 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:
|
|
* The network is locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
bool tcp_backlogavailable(FAR struct tcp_conn_s *conn);
|
|
#else
|
|
# define tcp_backlogavailable(c) (false)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: 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:
|
|
* The network is locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPBACKLOG
|
|
FAR struct tcp_conn_s *tcp_backlogremove(FAR struct tcp_conn_s *conn);
|
|
#else
|
|
# define tcp_backlogremove(c) (NULL)
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: 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
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_accept
|
|
*
|
|
* Description:
|
|
* This function implements accept() for TCP/IP sockets. See the
|
|
* description of accept() for further information.
|
|
*
|
|
* Input 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);
|
|
|
|
/****************************************************************************
|
|
* Name: psock_tcp_recvfrom
|
|
*
|
|
* Description:
|
|
* Perform the recvfrom operation for a TCP/IP SOCK_STREAM
|
|
*
|
|
* Input Parameters:
|
|
* psock Pointer to the socket structure for the SOCK_DRAM socket
|
|
* buf Buffer to receive data
|
|
* len Length of buffer
|
|
* flags Receive flags
|
|
* from INET address of source (may be NULL)
|
|
* fromlen The length of the address structure
|
|
*
|
|
* 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_tcp_recvfrom(FAR struct socket *psock, FAR void *buf,
|
|
size_t len, int flags, FAR struct sockaddr *from,
|
|
FAR socklen_t *fromlen);
|
|
|
|
/****************************************************************************
|
|
* Name: 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).
|
|
*
|
|
* Input Parameters:
|
|
* psock An instance of the internal socket structure.
|
|
* buf Data to send
|
|
* len Length of data to send
|
|
* flags Send flags
|
|
*
|
|
* 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, int flags);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_setsockopt
|
|
*
|
|
* Description:
|
|
* tcp_setsockopt() sets the TCP-protocol option specified by the
|
|
* 'option' argument to the value pointed to by the 'value' argument for
|
|
* the socket specified by the 'psock' argument.
|
|
*
|
|
* See <netinet/tcp.h> for the a complete list of values of TCP protocol
|
|
* options.
|
|
*
|
|
* Input Parameters:
|
|
* psock Socket structure of socket to operate on
|
|
* option identifies the option to set
|
|
* value Points to the argument value
|
|
* value_len The length of the argument value
|
|
*
|
|
* Returned Value:
|
|
* Returns zero (OK) on success. On failure, it returns a negated errno
|
|
* value to indicate the nature of the error. See psock_setcockopt() for
|
|
* the list of possible error values.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPPROTO_OPTIONS
|
|
int tcp_setsockopt(FAR struct socket *psock, int option,
|
|
FAR const void *value, socklen_t value_len);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_getsockopt
|
|
*
|
|
* Description:
|
|
* tcp_getsockopt() retrieves the value for the option specified by the
|
|
* 'option' argument for the socket specified by the 'psock' argument. If
|
|
* the size of the option value is greater than 'value_len', the value
|
|
* stored in the object pointed to by the 'value' argument will be silently
|
|
* truncated. Otherwise, the length pointed to by the 'value_len' argument
|
|
* will be modified to indicate the actual length of the 'value'.
|
|
*
|
|
* The 'level' argument specifies the protocol level of the option. To
|
|
* retrieve options at the socket level, specify the level argument as
|
|
* SOL_SOCKET; to retrieve options at the TCP-protocol level, the level
|
|
* argument is SOL_CP.
|
|
*
|
|
* See <sys/socket.h> a complete list of values for the socket-level
|
|
* 'option' argument. Protocol-specific options are are protocol specific
|
|
* header files (such as netinet/tcp.h for the case of the TCP protocol).
|
|
*
|
|
* Input Parameters:
|
|
* psock Socket structure of the socket to query
|
|
* level Protocol level to set the option
|
|
* option identifies the option to get
|
|
* value Points to the argument value
|
|
* value_len The length of the argument value
|
|
*
|
|
* Returned Value:
|
|
* Returns zero (OK) on success. On failure, it returns a negated errno
|
|
* value to indicate the nature of the error. See psock_getsockopt() for
|
|
* the complete list of appropriate return error codes.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCPPROTO_OPTIONS
|
|
int tcp_getsockopt(FAR struct socket *psock, int option,
|
|
FAR void *value, FAR socklen_t *value_len);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_get_recvwindow
|
|
*
|
|
* Description:
|
|
* Calculate the TCP receive window for the specified device.
|
|
*
|
|
* Input Parameters:
|
|
* dev - The device whose TCP receive window will be updated.
|
|
*
|
|
* Returned Value:
|
|
* The value of the TCP receive window to use.
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint16_t tcp_get_recvwindow(FAR struct net_driver_s *dev);
|
|
|
|
/****************************************************************************
|
|
* Name: psock_tcp_cansend
|
|
*
|
|
* Description:
|
|
* psock_tcp_cansend() returns a value indicating if a write to the socket
|
|
* would block. No space in the buffer is actually reserved, so it is
|
|
* possible that the write may still block if the buffer is filled by
|
|
* another means.
|
|
*
|
|
* Input Parameters:
|
|
* psock An instance of the internal socket structure.
|
|
*
|
|
* Returned Value:
|
|
* OK
|
|
* At least one byte of data could be successfully written.
|
|
* -EWOULDBLOCK
|
|
* There is no room in the output buffer.
|
|
* -EBADF
|
|
* An invalid descriptor was specified.
|
|
* -ENOTCONN
|
|
* The socket is not connected.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int psock_tcp_cansend(FAR struct socket *psock);
|
|
|
|
/****************************************************************************
|
|
* Name: 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 */
|
|
|
|
/****************************************************************************
|
|
* Name: 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);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_wrbuffer_tryalloc
|
|
*
|
|
* Description:
|
|
* Try to 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 be sent if the socket is non-blocking. Returns
|
|
* immediately if allocation fails.
|
|
*
|
|
* Input parameters:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from user logic with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct tcp_wrbuffer_s *tcp_wrbuffer_tryalloc(void);
|
|
#endif /* CONFIG_NET_TCP_WRITE_BUFFERS */
|
|
|
|
/****************************************************************************
|
|
* Name: 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 */
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_wrbuffer_test
|
|
*
|
|
* Description:
|
|
* Check if there is room in the write buffer. Does not reserve any space.
|
|
*
|
|
* Assumptions:
|
|
* None.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
int tcp_wrbuffer_test(void);
|
|
#endif /* CONFIG_NET_TCP_WRITE_BUFFERS */
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_wrbuffer_dump
|
|
*
|
|
* Description:
|
|
* Dump the contents of a write buffer.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
|
|
#ifdef CONFIG_DEBUG_FEATURES
|
|
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 */
|
|
|
|
/****************************************************************************
|
|
* Name: 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_pollsetup(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
|
|
/****************************************************************************
|
|
* Name: 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
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_pollteardown(FAR struct socket *psock, FAR struct pollfd *fds);
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_readahead_notifier_setup
|
|
*
|
|
* Description:
|
|
* Set up to perform a callback to the worker function when an TCP data
|
|
* is added to the read-ahead buffer. The worker function will execute
|
|
* on the high priority worker thread.
|
|
*
|
|
* Input Parameters:
|
|
* worker - The worker function to execute on the high priority work
|
|
* queue when data is available in the TCP read-ahead buffer.
|
|
* conn - The TCP 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 signal notification is in place. The returned value is a
|
|
* key that may be used later in a call to
|
|
* tcp_notifier_teardown().
|
|
* == 0 - There is already buffered read-ahead data. No signal
|
|
* notification will be provided.
|
|
* < 0 - An unexpected error occurred and no signal will be sent. The
|
|
* returned value is a negated errno value that indicates the
|
|
* nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_NOTIFIER
|
|
int tcp_readahead_notifier_setup(worker_t worker,
|
|
FAR struct tcp_conn_s *conn,
|
|
FAR void *arg);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_writebuffer_notifier_setup
|
|
*
|
|
* Description:
|
|
* Set up to perform a callback to the worker function when an TCP 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 high priority work
|
|
* queue when all buffer TX data has been sent.
|
|
* conn - The TCP connection where buffer write data is pending.
|
|
* arg - A user-defined argument that will be available to the worker
|
|
* function when it runs.
|
|
*
|
|
* Returned Value:
|
|
* > 0 - The signal notification is in place. The returned value is a
|
|
* key that may be used later in a call to
|
|
* tcp_notifier_teardown().
|
|
* == 0 - There is already buffered read-ahead data. No signal
|
|
* notification will be provided.
|
|
* < 0 - An unexpected error occurred and no signal will be sent. The
|
|
* returned value is a negated errno value that indicates the
|
|
* nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_NOTIFIER
|
|
int tcp_writebuffer_notifier_setup(worker_t worker,
|
|
FAR struct tcp_conn_s *conn,
|
|
FAR void *arg);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_disconnect_notifier_setup
|
|
*
|
|
* Description:
|
|
* Set up to perform a callback to the worker function if the TCP
|
|
* connection is lost.
|
|
*
|
|
* Input Parameters:
|
|
* worker - The worker function to execute on the high priority work
|
|
* queue when data is available in the TCP read-ahead buffer.
|
|
* conn - The TCP 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 signal notification is in place. The returned value is a
|
|
* key that may be used later in a call to
|
|
* tcp_notifier_teardown().
|
|
* == 0 - No connection has been established.
|
|
* < 0 - An unexpected error occurred and no signal will be sent. The
|
|
* returned value is a negated errno value that indicates the
|
|
* nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_NOTIFIER
|
|
int tcp_disconnect_notifier_setup(worker_t worker,
|
|
FAR struct tcp_conn_s *conn,
|
|
FAR void *arg);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_notifier_teardown
|
|
*
|
|
* Description:
|
|
* Eliminate a TCP read-ahead notification previously setup by
|
|
* tcp_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 signal is sent.
|
|
*
|
|
* Input Parameters:
|
|
* key - The key value returned from a previous call to
|
|
* tcp_readahead_notifier_setup().
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success; a negated errno value is returned on
|
|
* any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_NOTIFIER
|
|
int tcp_notifier_teardown(int key);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_readahead_signal
|
|
*
|
|
* Description:
|
|
* Read-ahead data has been buffered. Signal 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 tcp_readahead_notifier_setup() once
|
|
* again.
|
|
*
|
|
* Input Parameters:
|
|
* conn - The TCP connection where read-ahead data was just buffered.
|
|
*
|
|
* Returned Value:
|
|
* None.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_NOTIFIER
|
|
void tcp_readahead_signal(FAR struct tcp_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_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 tcp_writebuffer_notifier_setup() once
|
|
* again.
|
|
*
|
|
* Input Parameters:
|
|
* conn - The TCP connection where read-ahead data was just buffered.
|
|
*
|
|
* Returned Value:
|
|
* None.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_NET_TCP_WRITE_BUFFERS) && defined(CONFIG_NET_TCP_NOTIFIER)
|
|
void tcp_writebuffer_signal(FAR struct tcp_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_disconnect_signal
|
|
*
|
|
* Description:
|
|
* The TCP connection has been lost. Signal all threads monitoring TCP
|
|
* state events.
|
|
*
|
|
* Input Parameters:
|
|
* conn - The TCP connection where read-ahead data was just buffered.
|
|
*
|
|
* Returned Value:
|
|
* None.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP_NOTIFIER
|
|
void tcp_disconnect_signal(FAR struct tcp_conn_s *conn);
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_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_TCP_WRITE_BUFFERS) && defined(CONFIG_NET_TCP_NOTIFIER)
|
|
int tcp_txdrain(FAR struct socket *psock, unsigned int timeout);
|
|
#else
|
|
# define tcp_txdrain(conn, timeout) (0)
|
|
#endif
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_NET_TCP && !CONFIG_NET_TCP_NO_STACK */
|
|
#endif /* _NET_TCP_TCP_H */
|