+++ /dev/null
-/*
- * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
- * All rights reserved.
- *
- * 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. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
- *
- * This file is part of the lwIP TCP/IP stack.
- *
- * Author: Adam Dunkels <adam@sics.se>
- *
- */
-#ifndef __LWIP_TCP_H__
-#define __LWIP_TCP_H__
-
-#include "lwip/opt.h"
-
-#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
-
-#include "lwip/mem.h"
-#include "lwip/pbuf.h"
-#include "lwip/ip.h"
-#include "lwip/icmp.h"
-#include "lwip/err.h"
-#include "lwip/ip6.h"
-#include "lwip/ip6_addr.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct tcp_pcb;
-
-/** Function prototype for tcp accept callback functions. Called when a new
- * connection can be accepted on a listening pcb.
- *
- * @param arg Additional argument to pass to the callback function (@see tcp_arg())
- * @param newpcb The new connection pcb
- * @param err An error code if there has been an error accepting.
- * Only return ERR_ABRT if you have called tcp_abort from within the
- * callback function!
- */
-typedef err_t (*tcp_accept_fn)(void *arg, struct tcp_pcb *newpcb, err_t err);
-
-/** Function prototype for tcp receive callback functions. Called when data has
- * been received.
- *
- * @param arg Additional argument to pass to the callback function (@see tcp_arg())
- * @param tpcb The connection pcb which received data
- * @param p The received data (or NULL when the connection has been closed!)
- * @param err An error code if there has been an error receiving
- * Only return ERR_ABRT if you have called tcp_abort from within the
- * callback function!
- */
-typedef err_t (*tcp_recv_fn)(void *arg, struct tcp_pcb *tpcb,
- struct pbuf *p, err_t err);
-
-/** Function prototype for tcp sent callback functions. Called when sent data has
- * been acknowledged by the remote side. Use it to free corresponding resources.
- * This also means that the pcb has now space available to send new data.
- *
- * @param arg Additional argument to pass to the callback function (@see tcp_arg())
- * @param tpcb The connection pcb for which data has been acknowledged
- * @param len The amount of bytes acknowledged
- * @return ERR_OK: try to send some data by calling tcp_output
- * Only return ERR_ABRT if you have called tcp_abort from within the
- * callback function!
- */
-typedef err_t (*tcp_sent_fn)(void *arg, struct tcp_pcb *tpcb,
- u16_t len);
-
-/** Function prototype for tcp poll callback functions. Called periodically as
- * specified by @see tcp_poll.
- *
- * @param arg Additional argument to pass to the callback function (@see tcp_arg())
- * @param tpcb tcp pcb
- * @return ERR_OK: try to send some data by calling tcp_output
- * Only return ERR_ABRT if you have called tcp_abort from within the
- * callback function!
- */
-typedef err_t (*tcp_poll_fn)(void *arg, struct tcp_pcb *tpcb);
-
-/** Function prototype for tcp error callback functions. Called when the pcb
- * receives a RST or is unexpectedly closed for any other reason.
- *
- * @note The corresponding pcb is already freed when this callback is called!
- *
- * @param arg Additional argument to pass to the callback function (@see tcp_arg())
- * @param err Error code to indicate why the pcb has been closed
- * ERR_ABRT: aborted through tcp_abort or by a TCP timer
- * ERR_RST: the connection was reset by the remote host
- */
-typedef void (*tcp_err_fn)(void *arg, err_t err);
-
-/** Function prototype for tcp connected callback functions. Called when a pcb
- * is connected to the remote side after initiating a connection attempt by
- * calling tcp_connect().
- *
- * @param arg Additional argument to pass to the callback function (@see tcp_arg())
- * @param tpcb The connection pcb which is connected
- * @param err An unused error code, always ERR_OK currently ;-) TODO!
- * Only return ERR_ABRT if you have called tcp_abort from within the
- * callback function!
- *
- * @note When a connection attempt fails, the error callback is currently called!
- */
-typedef err_t (*tcp_connected_fn)(void *arg, struct tcp_pcb *tpcb, err_t err);
-
-enum tcp_state {
- CLOSED = 0,
- LISTEN = 1,
- SYN_SENT = 2,
- SYN_RCVD = 3,
- ESTABLISHED = 4,
- FIN_WAIT_1 = 5,
- FIN_WAIT_2 = 6,
- CLOSE_WAIT = 7,
- CLOSING = 8,
- LAST_ACK = 9,
- TIME_WAIT = 10
-};
-
-#if LWIP_CALLBACK_API
- /* Function to call when a listener has been connected.
- * @param arg user-supplied argument (tcp_pcb.callback_arg)
- * @param pcb a new tcp_pcb that now is connected
- * @param err an error argument (TODO: that is current always ERR_OK?)
- * @return ERR_OK: accept the new connection,
- * any other err_t abortsthe new connection
- */
-#define DEF_ACCEPT_CALLBACK tcp_accept_fn accept;
-#else /* LWIP_CALLBACK_API */
-#define DEF_ACCEPT_CALLBACK
-#endif /* LWIP_CALLBACK_API */
-
-/**
- * members common to struct tcp_pcb and struct tcp_listen_pcb
- */
-#define TCP_PCB_COMMON(type) \
- type *next; /* for the linked list */ \
- void *callback_arg; \
- /* the accept callback for listen- and normal pcbs, if LWIP_CALLBACK_API */ \
- DEF_ACCEPT_CALLBACK \
- enum tcp_state state; /* TCP state */ \
- u8_t prio; \
- /* ports are in host byte order */ \
- u16_t local_port
-
-
-/* the TCP protocol control block */
-struct tcp_pcb {
-/** common PCB members */
- IP_PCB;
-/** protocol specific PCB members */
- TCP_PCB_COMMON(struct tcp_pcb);
-
- /* ports are in host byte order */
- u16_t remote_port;
-
- u8_t flags;
-#define TF_ACK_DELAY ((u8_t)0x01U) /* Delayed ACK. */
-#define TF_ACK_NOW ((u8_t)0x02U) /* Immediate ACK. */
-#define TF_INFR ((u8_t)0x04U) /* In fast recovery. */
-#define TF_TIMESTAMP ((u8_t)0x08U) /* Timestamp option enabled */
-#define TF_RXCLOSED ((u8_t)0x10U) /* rx closed by tcp_shutdown */
-#define TF_FIN ((u8_t)0x20U) /* Connection was closed locally (FIN segment enqueued). */
-#define TF_NODELAY ((u8_t)0x40U) /* Disable Nagle algorithm */
-#define TF_NAGLEMEMERR ((u8_t)0x80U) /* nagle enabled, memerr, try to output to prevent delayed ACK to happen */
-
- /* the rest of the fields are in host byte order
- as we have to do some math with them */
-
- /* Timers */
- u8_t polltmr, pollinterval;
- u32_t tmr;
-
- /* receiver variables */
- u32_t rcv_nxt; /* next seqno expected */
- u16_t rcv_wnd; /* receiver window available */
- u16_t rcv_ann_wnd; /* receiver window to announce */
- u32_t rcv_ann_right_edge; /* announced right edge of window */
-
- /* Retransmission timer. */
- s16_t rtime;
-
- u16_t mss; /* maximum segment size */
-
- /* RTT (round trip time) estimation variables */
- u32_t rttest; /* RTT estimate in 500ms ticks */
- u32_t rtseq; /* sequence number being timed */
- s16_t sa, sv; /* @todo document this */
-
- s16_t rto; /* retransmission time-out */
- u8_t nrtx; /* number of retransmissions */
-
- /* fast retransmit/recovery */
- u8_t dupacks;
- u32_t lastack; /* Highest acknowledged seqno. */
-
- /* congestion avoidance/control variables */
- u16_t cwnd;
- u16_t ssthresh;
-
- /* sender variables */
- u32_t snd_nxt; /* next new seqno to be sent */
- u32_t snd_wl1, snd_wl2; /* Sequence and acknowledgement numbers of last
- window update. */
- u32_t snd_lbb; /* Sequence number of next byte to be buffered. */
- u16_t snd_wnd; /* sender window */
-
- u16_t acked;
-
- u16_t snd_buf; /* Available buffer space for sending (in bytes). */
-#define TCP_SNDQUEUELEN_OVERFLOW (0xffffU-3)
- u16_t snd_queuelen; /* Available buffer space for sending (in tcp_segs). */
-
-#if TCP_OVERSIZE
- /* Extra bytes available at the end of the last pbuf in unsent. */
- u16_t unsent_oversize;
-#endif /* TCP_OVERSIZE */
-
- /* These are ordered by sequence number: */
- struct tcp_seg *unsent; /* Unsent (queued) segments. */
- struct tcp_seg *unacked; /* Sent but unacknowledged segments. */
-#if TCP_QUEUE_OOSEQ
- struct tcp_seg *ooseq; /* Received out of sequence segments. */
-#endif /* TCP_QUEUE_OOSEQ */
-
- struct pbuf *refused_data; /* Data previously received but not yet taken by upper layer */
-
-#if LWIP_CALLBACK_API
- /* Function to be called when more send buffer space is available. */
- tcp_sent_fn sent;
- /* Function to be called when (in-sequence) data has arrived. */
- tcp_recv_fn recv;
- /* Function to be called when a connection has been set up. */
- tcp_connected_fn connected;
- /* Function which is called periodically. */
- tcp_poll_fn poll;
- /* Function to be called whenever a fatal error occurs. */
- tcp_err_fn errf;
-#endif /* LWIP_CALLBACK_API */
-
-#if LWIP_TCP_TIMESTAMPS
- u32_t ts_lastacksent;
- u32_t ts_recent;
-#endif /* LWIP_TCP_TIMESTAMPS */
-
- /* idle time before KEEPALIVE is sent */
- u32_t keep_idle;
-#if LWIP_TCP_KEEPALIVE
- u32_t keep_intvl;
- u32_t keep_cnt;
-#endif /* LWIP_TCP_KEEPALIVE */
-
- /* Persist timer counter */
- u32_t persist_cnt;
- /* Persist timer back-off */
- u8_t persist_backoff;
-
- /* KEEPALIVE counter */
- u8_t keep_cnt_sent;
-};
-
-struct tcp_pcb_listen {
-/* Common members of all PCB types */
- IP_PCB;
-/* Protocol specific PCB members */
- TCP_PCB_COMMON(struct tcp_pcb_listen);
-
-#if TCP_LISTEN_BACKLOG
- u8_t backlog;
- u8_t accepts_pending;
-#endif /* TCP_LISTEN_BACKLOG */
-#if LWIP_IPV6
- u8_t accept_any_ip_version;
-#endif /* LWIP_IPV6 */
-};
-
-#if LWIP_EVENT_API
-
-enum lwip_event {
- LWIP_EVENT_ACCEPT,
- LWIP_EVENT_SENT,
- LWIP_EVENT_RECV,
- LWIP_EVENT_CONNECTED,
- LWIP_EVENT_POLL,
- LWIP_EVENT_ERR
-};
-
-err_t lwip_tcp_event(void *arg, struct tcp_pcb *pcb,
- enum lwip_event,
- struct pbuf *p,
- u16_t size,
- err_t err);
-
-#endif /* LWIP_EVENT_API */
-
-/* Application program's interface: */
-struct tcp_pcb * tcp_new (void);
-
-void tcp_arg (struct tcp_pcb *pcb, void *arg);
-void tcp_accept (struct tcp_pcb *pcb, tcp_accept_fn accept);
-void tcp_recv (struct tcp_pcb *pcb, tcp_recv_fn recv);
-void tcp_sent (struct tcp_pcb *pcb, tcp_sent_fn sent);
-void tcp_poll (struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval);
-void tcp_err (struct tcp_pcb *pcb, tcp_err_fn err);
-
-#define tcp_mss(pcb) (((pcb)->flags & TF_TIMESTAMP) ? ((pcb)->mss - 12) : (pcb)->mss)
-#define tcp_sndbuf(pcb) ((pcb)->snd_buf)
-#define tcp_sndqueuelen(pcb) ((pcb)->snd_queuelen)
-#define tcp_nagle_disable(pcb) ((pcb)->flags |= TF_NODELAY)
-#define tcp_nagle_enable(pcb) ((pcb)->flags &= ~TF_NODELAY)
-#define tcp_nagle_disabled(pcb) (((pcb)->flags & TF_NODELAY) != 0)
-
-#if TCP_LISTEN_BACKLOG
-#define tcp_accepted(pcb) do { \
- LWIP_ASSERT("pcb->state == LISTEN (called for wrong pcb?)", pcb->state == LISTEN); \
- (((struct tcp_pcb_listen *)(pcb))->accepts_pending--); } while(0)
-#else /* TCP_LISTEN_BACKLOG */
-#define tcp_accepted(pcb) LWIP_ASSERT("pcb->state == LISTEN (called for wrong pcb?)", \
- pcb->state == LISTEN)
-#endif /* TCP_LISTEN_BACKLOG */
-
-void tcp_recved (struct tcp_pcb *pcb, u16_t len);
-err_t tcp_bind (struct tcp_pcb *pcb, ip_addr_t *ipaddr,
- u16_t port);
-err_t tcp_connect (struct tcp_pcb *pcb, ip_addr_t *ipaddr,
- u16_t port, tcp_connected_fn connected);
-
-struct tcp_pcb * tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog);
-#define tcp_listen(pcb) tcp_listen_with_backlog(pcb, TCP_DEFAULT_LISTEN_BACKLOG)
-
-void tcp_abort (struct tcp_pcb *pcb);
-err_t tcp_close (struct tcp_pcb *pcb);
-err_t tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx);
-
-/* Flags for "apiflags" parameter in tcp_write */
-#define TCP_WRITE_FLAG_COPY 0x01
-#define TCP_WRITE_FLAG_MORE 0x02
-
-err_t tcp_write (struct tcp_pcb *pcb, const void *dataptr, u16_t len,
- u8_t apiflags);
-
-void tcp_setprio (struct tcp_pcb *pcb, u8_t prio);
-
-#define TCP_PRIO_MIN 1
-#define TCP_PRIO_NORMAL 64
-#define TCP_PRIO_MAX 127
-
-err_t tcp_output (struct tcp_pcb *pcb);
-
-
-const char* tcp_debug_state_str(enum tcp_state s);
-
-#if LWIP_IPV6
-struct tcp_pcb * tcp_new_ip6 (void);
-#define tcp_bind_ip6(pcb, ip6addr, port) \
- tcp_bind(pcb, ip6_2_ip(ip6addr), port)
-#define tcp_connect_ip6(pcb, ip6addr, port, connected) \
- tcp_connect(pcb, ip6_2_ip(ip6addr), port, connected)
-struct tcp_pcb * tcp_listen_dual_with_backlog(struct tcp_pcb *pcb, u8_t backlog);
-#define tcp_listen_dual(pcb) tcp_listen_dual_with_backlog(pcb, TCP_DEFAULT_LISTEN_BACKLOG)
-#else /* LWIP_IPV6 */
-#define tcp_listen_dual_with_backlog(pcb, backlog) tcp_listen_with_backlog(pcb, backlog)
-#define tcp_listen_dual(pcb) tcp_listen(pcb)
-#endif /* LWIP_IPV6 */
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* LWIP_TCP */
-
-#endif /* __LWIP_TCP_H__ */