Diff: lwip/include/lwip/tcp_impl.h

Revision:

1:9d93f4dc2f46

Parent:

0:8b387bed54c2

--- a/lwip/include/lwip/tcp_impl.h	Mon Jan 10 21:03:11 2011 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,472 +0,0 @@
-/*
- * 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_IMPL_H__
-#define __LWIP_TCP_IMPL_H__
-
-#include "lwip/opt.h"
-
-#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
-
-#include "lwip/tcp.h"
-#include "lwip/sys.h"
-#include "lwip/mem.h"
-#include "lwip/pbuf.h"
-#include "lwip/ip.h"
-#include "lwip/icmp.h"
-#include "lwip/err.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Functions for interfacing with TCP: */
-
-/* Lower layer interface to TCP: */
-#define tcp_init() /* Compatibility define, no init needed. */
-void             tcp_tmr     (void);  /* Must be called every
-                                         TCP_TMR_INTERVAL
-                                         ms. (Typically 250 ms). */
-/* It is also possible to call these two functions at the right
-   intervals (instead of calling tcp_tmr()). */
-void             tcp_slowtmr (void);
-void             tcp_fasttmr (void);
-
-
-/* Only used by IP to pass a TCP segment to TCP: */
-void             tcp_input   (struct pbuf *p, struct netif *inp);
-/* Used within the TCP code only: */
-struct tcp_pcb * tcp_alloc   (u8_t prio);
-void             tcp_abandon (struct tcp_pcb *pcb, int reset);
-err_t            tcp_send_empty_ack(struct tcp_pcb *pcb);
-void             tcp_rexmit  (struct tcp_pcb *pcb);
-void             tcp_rexmit_rto  (struct tcp_pcb *pcb);
-void             tcp_rexmit_fast (struct tcp_pcb *pcb);
-u32_t            tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb);
-
-/**
- * This is the Nagle algorithm: try to combine user data to send as few TCP
- * segments as possible. Only send if
- * - no previously transmitted data on the connection remains unacknowledged or
- * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or
- * - the only unsent segment is at least pcb->mss bytes long (or there is more
- *   than one unsent segment - with lwIP, this can happen although unsent->len < mss)
- * - or if we are in fast-retransmit (TF_INFR)
- */
-#define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \
-                            ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \
-                            (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \
-                              ((tpcb)->unsent->len >= (tpcb)->mss))) \
-                            ) ? 1 : 0)
-#define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)
-
-
-#define TCP_SEQ_LT(a,b)     ((s32_t)((a)-(b)) < 0)
-#define TCP_SEQ_LEQ(a,b)    ((s32_t)((a)-(b)) <= 0)
-#define TCP_SEQ_GT(a,b)     ((s32_t)((a)-(b)) > 0)
-#define TCP_SEQ_GEQ(a,b)    ((s32_t)((a)-(b)) >= 0)
-/* is b<=a<=c? */
-#if 0 /* see bug #10548 */
-#define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
-#endif
-#define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
-#define TCP_FIN 0x01U
-#define TCP_SYN 0x02U
-#define TCP_RST 0x04U
-#define TCP_PSH 0x08U
-#define TCP_ACK 0x10U
-#define TCP_URG 0x20U
-#define TCP_ECE 0x40U
-#define TCP_CWR 0x80U
-
-#define TCP_FLAGS 0x3fU
-
-/* Length of the TCP header, excluding options. */
-#define TCP_HLEN 20
-
-#ifndef TCP_TMR_INTERVAL
-#define TCP_TMR_INTERVAL       250  /* The TCP timer interval in milliseconds. */
-#endif /* TCP_TMR_INTERVAL */
-
-#ifndef TCP_FAST_INTERVAL
-#define TCP_FAST_INTERVAL      TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */
-#endif /* TCP_FAST_INTERVAL */
-
-#ifndef TCP_SLOW_INTERVAL
-#define TCP_SLOW_INTERVAL      (2*TCP_TMR_INTERVAL)  /* the coarse grained timeout in milliseconds */
-#endif /* TCP_SLOW_INTERVAL */
-
-#define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
-#define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */
-
-#define TCP_OOSEQ_TIMEOUT        6U /* x RTO */
-
-#ifndef TCP_MSL
-#define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */
-#endif
-
-/* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */
-#ifndef  TCP_KEEPIDLE_DEFAULT
-#define  TCP_KEEPIDLE_DEFAULT     7200000UL /* Default KEEPALIVE timer in milliseconds */
-#endif
-
-#ifndef  TCP_KEEPINTVL_DEFAULT
-#define  TCP_KEEPINTVL_DEFAULT    75000UL   /* Default Time between KEEPALIVE probes in milliseconds */
-#endif
-
-#ifndef  TCP_KEEPCNT_DEFAULT
-#define  TCP_KEEPCNT_DEFAULT      9U        /* Default Counter for KEEPALIVE probes */
-#endif
-
-#define  TCP_MAXIDLE              TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT  /* Maximum KEEPALIVE probe time */
-
-/* Fields are (of course) in network byte order.
- * Some fields are converted to host byte order in tcp_input().
- */
-#ifdef PACK_STRUCT_USE_INCLUDES
-#  include "arch/bpstruct.h"
-#endif
-PACK_STRUCT_BEGIN
-struct tcp_hdr {
-  PACK_STRUCT_FIELD(u16_t src);
-  PACK_STRUCT_FIELD(u16_t dest);
-  PACK_STRUCT_FIELD(u32_t seqno);
-  PACK_STRUCT_FIELD(u32_t ackno);
-  PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags);
-  PACK_STRUCT_FIELD(u16_t wnd);
-  PACK_STRUCT_FIELD(u16_t chksum);
-  PACK_STRUCT_FIELD(u16_t urgp);
-} PACK_STRUCT_STRUCT;
-PACK_STRUCT_END
-#ifdef PACK_STRUCT_USE_INCLUDES
-#  include "arch/epstruct.h"
-#endif
-
-#define TCPH_OFFSET(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 8)
-#define TCPH_HDRLEN(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 12)
-#define TCPH_FLAGS(phdr)  (ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS)
-
-#define TCPH_OFFSET_SET(phdr, offset) (phdr)->_hdrlen_rsvd_flags = htons(((offset) << 8) | TCPH_FLAGS(phdr))
-#define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | TCPH_FLAGS(phdr))
-#define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = (((phdr)->_hdrlen_rsvd_flags & PP_HTONS((u16_t)(~(u16_t)(TCP_FLAGS)))) | htons(flags))
-#define TCPH_HDRLEN_FLAGS_SET(phdr, len, flags) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | (flags))
-
-#define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags | htons(flags))
-#define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) | (TCPH_FLAGS(phdr) & ~(flags)) )
-
-#define TCP_TCPLEN(seg) ((seg)->len + ((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0))
-
-/** Flags used on input processing, not on pcb->flags
-*/
-#define TF_RESET     (u8_t)0x08U   /* Connection was reset. */
-#define TF_CLOSED    (u8_t)0x10U   /* Connection was sucessfully closed. */
-#define TF_GOT_FIN   (u8_t)0x20U   /* Connection was closed by the remote end. */
-
-
-#if LWIP_EVENT_API
-
-#define TCP_EVENT_ACCEPT(pcb,err,ret)    ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
-                LWIP_EVENT_ACCEPT, NULL, 0, err)
-#define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
-                   LWIP_EVENT_SENT, NULL, space, ERR_OK)
-#define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
-                LWIP_EVENT_RECV, (p), 0, (err))
-#define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
-                LWIP_EVENT_RECV, NULL, 0, ERR_OK)
-#define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
-                LWIP_EVENT_CONNECTED, NULL, 0, (err))
-#define TCP_EVENT_POLL(pcb,ret)       ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
-                LWIP_EVENT_POLL, NULL, 0, ERR_OK)
-#define TCP_EVENT_ERR(errf,arg,err)  lwip_tcp_event((arg), NULL, \
-                LWIP_EVENT_ERR, NULL, 0, (err))
-
-#else /* LWIP_EVENT_API */
-
-#define TCP_EVENT_ACCEPT(pcb,err,ret)                          \
-  do {                                                         \
-    if((pcb)->accept != NULL)                                  \
-      (ret) = (pcb)->accept((pcb)->callback_arg,(pcb),(err));  \
-    else (ret) = ERR_ARG;                                      \
-  } while (0)
-
-#define TCP_EVENT_SENT(pcb,space,ret)                          \
-  do {                                                         \
-    if((pcb)->sent != NULL)                                    \
-      (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space));  \
-    else (ret) = ERR_OK;                                       \
-  } while (0)
-
-#define TCP_EVENT_RECV(pcb,p,err,ret)                          \
-  do {                                                         \
-    if((pcb)->recv != NULL) {                                  \
-      (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\
-    } else {                                                   \
-      (ret) = tcp_recv_null(NULL, (pcb), (p), (err));          \
-    }                                                          \
-  } while (0)
-
-#define TCP_EVENT_CLOSED(pcb,ret)                                \
-  do {                                                           \
-    if(((pcb)->recv != NULL)) {                                  \
-      (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\
-    } else {                                                     \
-      (ret) = ERR_OK;                                            \
-    }                                                            \
-  } while (0)
-
-#define TCP_EVENT_CONNECTED(pcb,err,ret)                         \
-  do {                                                           \
-    if((pcb)->connected != NULL)                                 \
-      (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \
-    else (ret) = ERR_OK;                                         \
-  } while (0)
-
-#define TCP_EVENT_POLL(pcb,ret)                                \
-  do {                                                         \
-    if((pcb)->poll != NULL)                                    \
-      (ret) = (pcb)->poll((pcb)->callback_arg,(pcb));          \
-    else (ret) = ERR_OK;                                       \
-  } while (0)
-
-#define TCP_EVENT_ERR(errf,arg,err)                            \
-  do {                                                         \
-    if((errf) != NULL)                                         \
-      (errf)((arg),(err));                                     \
-  } while (0)
-
-#endif /* LWIP_EVENT_API */
-
-/** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */
-#if TCP_OVERSIZE && defined(LWIP_DEBUG)
-#define TCP_OVERSIZE_DBGCHECK 1
-#else
-#define TCP_OVERSIZE_DBGCHECK 0
-#endif
-
-/** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */
-#define TCP_CHECKSUM_ON_COPY  (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP)
-
-/* This structure represents a TCP segment on the unsent, unacked and ooseq queues */
-struct tcp_seg {
-  struct tcp_seg *next;    /* used when putting segements on a queue */
-  struct pbuf *p;          /* buffer containing data + TCP header */
-  void *dataptr;           /* pointer to the TCP data in the pbuf */
-  u16_t len;               /* the TCP length of this segment */
-#if TCP_OVERSIZE_DBGCHECK
-  u16_t oversize_left;     /* Extra bytes available at the end of the last
-                              pbuf in unsent (used for asserting vs.
-                              tcp_pcb.unsent_oversized only) */
-#endif /* TCP_OVERSIZE_DBGCHECK */ 
-#if TCP_CHECKSUM_ON_COPY
-  u16_t chksum;
-  u8_t  chksum_swapped;
-#endif /* TCP_CHECKSUM_ON_COPY */
-  u8_t  flags;
-#define TF_SEG_OPTS_MSS         (u8_t)0x01U /* Include MSS option. */
-#define TF_SEG_OPTS_TS          (u8_t)0x02U /* Include timestamp option. */
-#define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is
-                                               checksummed into 'chksum' */
-  struct tcp_hdr *tcphdr;  /* the TCP header */
-};
-
-#define LWIP_TCP_OPT_LENGTH(flags)              \
-  (flags & TF_SEG_OPTS_MSS ? 4  : 0) +          \
-  (flags & TF_SEG_OPTS_TS  ? 12 : 0)
-
-/** This returns a TCP header option for MSS in an u32_t */
-#define TCP_BUILD_MSS_OPTION(x) (x) = PP_HTONL(((u32_t)2 << 24) |          \
-                                               ((u32_t)4 << 16) |          \
-                                               (((u32_t)TCP_MSS / 256) << 8) | \
-                                               (TCP_MSS & 255))
-
-/* Global variables: */
-extern struct tcp_pcb *tcp_input_pcb;
-extern u32_t tcp_ticks;
-
-/* The TCP PCB lists. */
-union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */
-  struct tcp_pcb_listen *listen_pcbs; 
-  struct tcp_pcb *pcbs;
-};
-extern struct tcp_pcb *tcp_bound_pcbs;
-extern union tcp_listen_pcbs_t tcp_listen_pcbs;
-extern struct tcp_pcb *tcp_active_pcbs;  /* List of all TCP PCBs that are in a
-              state in which they accept or send
-              data. */
-extern struct tcp_pcb *tcp_tw_pcbs;      /* List of all TCP PCBs in TIME-WAIT. */
-
-extern struct tcp_pcb *tcp_tmp_pcb;      /* Only used for temporary storage. */
-
-/* Axioms about the above lists:   
-   1) Every TCP PCB that is not CLOSED is in one of the lists.
-   2) A PCB is only in one of the lists.
-   3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
-   4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
-*/
-/* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
-   with a PCB list or removes a PCB from a list, respectively. */
-#ifndef TCP_DEBUG_PCB_LISTS
-#define TCP_DEBUG_PCB_LISTS 0
-#endif
-#if TCP_DEBUG_PCB_LISTS
-#define TCP_REG(pcbs, npcb) do {\
-                            LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", (npcb), (npcb)->local_port)); \
-                            for(tcp_tmp_pcb = *(pcbs); \
-          tcp_tmp_pcb != NULL; \
-        tcp_tmp_pcb = tcp_tmp_pcb->next) { \
-                                LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \
-                            } \
-                            LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \
-                            (npcb)->next = *(pcbs); \
-                            LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \
-                            *(pcbs) = (npcb); \
-                            LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
-              tcp_timer_needed(); \
-                            } while(0)
-#define TCP_RMV(pcbs, npcb) do { \
-                            LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \
-                            LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (npcb), *(pcbs))); \
-                            if(*(pcbs) == (npcb)) { \
-                               *(pcbs) = (*pcbs)->next; \
-                            } else for(tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
-                               if(tcp_tmp_pcb->next == (npcb)) { \
-                                  tcp_tmp_pcb->next = (npcb)->next; \
-                                  break; \
-                               } \
-                            } \
-                            (npcb)->next = NULL; \
-                            LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
-                            LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (npcb), *(pcbs))); \
-                            } while(0)
-
-#else /* LWIP_DEBUG */
-
-#define TCP_REG(pcbs, npcb)                        \
-  do {                                             \
-    (npcb)->next = *pcbs;                          \
-    *(pcbs) = (npcb);                              \
-    tcp_timer_needed();                            \
-  } while (0)
-
-#define TCP_RMV(pcbs, npcb)                        \
-  do {                                             \
-    if(*(pcbs) == (npcb)) {                        \
-      (*(pcbs)) = (*pcbs)->next;                   \
-    }                                              \
-    else {                                         \
-      for(tcp_tmp_pcb = *pcbs;                     \
-          tcp_tmp_pcb != NULL;                     \
-          tcp_tmp_pcb = tcp_tmp_pcb->next) {       \
-        if(tcp_tmp_pcb->next == (npcb)) {          \
-          tcp_tmp_pcb->next = (npcb)->next;        \
-          break;                                   \
-        }                                          \
-      }                                            \
-    }                                              \
-    (npcb)->next = NULL;                           \
-  } while(0)
-
-#endif /* LWIP_DEBUG */
-
-
-/* Internal functions: */
-struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb);
-void tcp_pcb_purge(struct tcp_pcb *pcb);
-void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb);
-
-void tcp_segs_free(struct tcp_seg *seg);
-void tcp_seg_free(struct tcp_seg *seg);
-struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg);
-
-#define tcp_ack(pcb)                               \
-  do {                                             \
-    if((pcb)->flags & TF_ACK_DELAY) {              \
-      (pcb)->flags &= ~TF_ACK_DELAY;               \
-      (pcb)->flags |= TF_ACK_NOW;                  \
-    }                                              \
-    else {                                         \
-      (pcb)->flags |= TF_ACK_DELAY;                \
-    }                                              \
-  } while (0)
-
-#define tcp_ack_now(pcb)                           \
-  do {                                             \
-    (pcb)->flags |= TF_ACK_NOW;                    \
-  } while (0)
-
-err_t tcp_send_fin(struct tcp_pcb *pcb);
-err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags);
-
-void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg);
-
-void tcp_rst(u32_t seqno, u32_t ackno,
-       ip_addr_t *local_ip, ip_addr_t *remote_ip,
-       u16_t local_port, u16_t remote_port);
-
-u32_t tcp_next_iss(void);
-
-void tcp_keepalive(struct tcp_pcb *pcb);
-void tcp_zero_window_probe(struct tcp_pcb *pcb);
-
-#if TCP_CALCULATE_EFF_SEND_MSS
-u16_t tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr);
-#endif /* TCP_CALCULATE_EFF_SEND_MSS */
-
-#if LWIP_CALLBACK_API
-err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
-#endif /* LWIP_CALLBACK_API */
-
-#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
-void tcp_debug_print(struct tcp_hdr *tcphdr);
-void tcp_debug_print_flags(u8_t flags);
-void tcp_debug_print_state(enum tcp_state s);
-void tcp_debug_print_pcbs(void);
-s16_t tcp_pcbs_sane(void);
-#else
-#  define tcp_debug_print(tcphdr)
-#  define tcp_debug_print_flags(flags)
-#  define tcp_debug_print_state(s)
-#  define tcp_debug_print_pcbs()
-#  define tcp_pcbs_sane() 1
-#endif /* TCP_DEBUG */
-
-/** External function (implemented in timers.c), called when TCP detects
- * that a timer is needed (i.e. active- or time-wait-pcb found). */
-void tcp_timer_needed(void);
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* LWIP_TCP */
-
-#endif /* __LWIP_TCP_H__ */