2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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3 * All rights reserved.
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5 * Redistribution and use in source and binary forms, with or without modification,
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6 * are permitted provided that the following conditions are met:
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8 * 1. Redistributions of source code must retain the above copyright notice,
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9 * this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 * this list of conditions and the following disclaimer in the documentation
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12 * and/or other materials provided with the distribution.
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13 * 3. The name of the author may not be used to endorse or promote products
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14 * derived from this software without specific prior written permission.
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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27 * This file is part of the lwIP TCP/IP stack.
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29 * Author: Adam Dunkels <adam@sics.se>
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32 #ifndef __LWIP_TCP_H__
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33 #define __LWIP_TCP_H__
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35 #include "lwip/opt.h"
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37 #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
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39 #include "lwip/sys.h"
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40 #include "lwip/mem.h"
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41 #include "lwip/pbuf.h"
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42 #include "lwip/ip.h"
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43 #include "lwip/icmp.h"
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44 #include "lwip/err.h"
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52 /* Functions for interfacing with TCP: */
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54 /* Lower layer interface to TCP: */
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55 #define tcp_init() /* Compatibility define, not init needed. */
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56 void tcp_tmr (void); /* Must be called every
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58 ms. (Typically 250 ms). */
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59 /* Application program's interface: */
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60 struct tcp_pcb * tcp_new (void);
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61 struct tcp_pcb * tcp_alloc (u8_t prio);
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63 void tcp_arg (struct tcp_pcb *pcb, void *arg);
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64 void tcp_accept (struct tcp_pcb *pcb,
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65 err_t (* accept)(void *arg, struct tcp_pcb *newpcb,
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67 void tcp_recv (struct tcp_pcb *pcb,
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68 err_t (* recv)(void *arg, struct tcp_pcb *tpcb,
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69 struct pbuf *p, err_t err));
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70 void tcp_sent (struct tcp_pcb *pcb,
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71 err_t (* sent)(void *arg, struct tcp_pcb *tpcb,
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73 void tcp_poll (struct tcp_pcb *pcb,
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74 err_t (* poll)(void *arg, struct tcp_pcb *tpcb),
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76 void tcp_err (struct tcp_pcb *pcb,
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77 void (* err)(void *arg, err_t err));
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79 #define tcp_mss(pcb) ((pcb)->mss)
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80 #define tcp_sndbuf(pcb) ((pcb)->snd_buf)
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82 #if TCP_LISTEN_BACKLOG
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83 #define tcp_accepted(pcb) (((struct tcp_pcb_listen *)(pcb))->accepts_pending--)
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84 #else /* TCP_LISTEN_BACKLOG */
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85 #define tcp_accepted(pcb)
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86 #endif /* TCP_LISTEN_BACKLOG */
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88 void tcp_recved (struct tcp_pcb *pcb, u16_t len);
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89 err_t tcp_bind (struct tcp_pcb *pcb, struct ip_addr *ipaddr,
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91 err_t tcp_connect (struct tcp_pcb *pcb, struct ip_addr *ipaddr,
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92 u16_t port, err_t (* connected)(void *arg,
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93 struct tcp_pcb *tpcb,
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96 struct tcp_pcb * tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog);
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97 #define tcp_listen(pcb) tcp_listen_with_backlog(pcb, TCP_DEFAULT_LISTEN_BACKLOG)
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99 void tcp_abort (struct tcp_pcb *pcb);
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100 err_t tcp_close (struct tcp_pcb *pcb);
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102 /* Flags for "apiflags" parameter in tcp_write and tcp_enqueue */
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103 #define TCP_WRITE_FLAG_COPY 0x01
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104 #define TCP_WRITE_FLAG_MORE 0x02
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106 err_t tcp_write (struct tcp_pcb *pcb, const void *dataptr, u16_t len,
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109 void tcp_setprio (struct tcp_pcb *pcb, u8_t prio);
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111 #define TCP_PRIO_MIN 1
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112 #define TCP_PRIO_NORMAL 64
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113 #define TCP_PRIO_MAX 127
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115 /* It is also possible to call these two functions at the right
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116 intervals (instead of calling tcp_tmr()). */
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117 void tcp_slowtmr (void);
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118 void tcp_fasttmr (void);
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121 /* Only used by IP to pass a TCP segment to TCP: */
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122 void tcp_input (struct pbuf *p, struct netif *inp);
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123 /* Used within the TCP code only: */
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124 err_t tcp_output (struct tcp_pcb *pcb);
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125 void tcp_rexmit (struct tcp_pcb *pcb);
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126 void tcp_rexmit_rto (struct tcp_pcb *pcb);
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129 * This is the Nagle algorithm: inhibit the sending of new TCP
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130 * segments when new outgoing data arrives from the user if any
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131 * previously transmitted data on the connection remains
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134 #define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \
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135 ((tpcb)->flags & TF_NODELAY) || \
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136 (((tpcb)->unsent != NULL) && ((tpcb)->unsent->next != NULL))) ? \
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138 #define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)
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141 /** This returns a TCP header option for MSS in an u32_t */
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142 #define TCP_BUILD_MSS_OPTION() htonl(((u32_t)2 << 24) | \
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143 ((u32_t)4 << 16) | \
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144 (((u32_t)TCP_MSS / 256) << 8) | \
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147 #define TCP_SEQ_LT(a,b) ((s32_t)((a)-(b)) < 0)
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148 #define TCP_SEQ_LEQ(a,b) ((s32_t)((a)-(b)) <= 0)
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149 #define TCP_SEQ_GT(a,b) ((s32_t)((a)-(b)) > 0)
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150 #define TCP_SEQ_GEQ(a,b) ((s32_t)((a)-(b)) >= 0)
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152 #if 0 /* see bug #10548 */
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153 #define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
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155 #define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
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156 #define TCP_FIN 0x01U
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157 #define TCP_SYN 0x02U
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158 #define TCP_RST 0x04U
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159 #define TCP_PSH 0x08U
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160 #define TCP_ACK 0x10U
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161 #define TCP_URG 0x20U
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162 #define TCP_ECE 0x40U
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163 #define TCP_CWR 0x80U
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165 #define TCP_FLAGS 0x3fU
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167 /* Length of the TCP header, excluding options. */
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168 #define TCP_HLEN 20
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170 #ifndef TCP_TMR_INTERVAL
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171 #define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */
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172 #endif /* TCP_TMR_INTERVAL */
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174 #ifndef TCP_FAST_INTERVAL
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175 #define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */
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176 #endif /* TCP_FAST_INTERVAL */
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178 #ifndef TCP_SLOW_INTERVAL
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179 #define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */
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180 #endif /* TCP_SLOW_INTERVAL */
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182 #define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
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183 #define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */
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185 #define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
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188 #define TCP_MSL 60000U /* The maximum segment lifetime in milliseconds */
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191 /* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */
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192 #ifndef TCP_KEEPIDLE_DEFAULT
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193 #define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */
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196 #ifndef TCP_KEEPINTVL_DEFAULT
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197 #define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */
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200 #ifndef TCP_KEEPCNT_DEFAULT
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201 #define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */
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204 #define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */
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206 /* Fields are (of course) in network byte order.
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207 * Some fields are converted to host byte order in tcp_input().
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209 #ifdef PACK_STRUCT_USE_INCLUDES
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210 # include "arch/bpstruct.h"
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214 PACK_STRUCT_FIELD(u16_t src);
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215 PACK_STRUCT_FIELD(u16_t dest);
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216 PACK_STRUCT_FIELD(u32_t seqno);
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217 PACK_STRUCT_FIELD(u32_t ackno);
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218 PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags);
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219 PACK_STRUCT_FIELD(u16_t wnd);
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220 PACK_STRUCT_FIELD(u16_t chksum);
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221 PACK_STRUCT_FIELD(u16_t urgp);
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222 } PACK_STRUCT_STRUCT;
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224 #ifdef PACK_STRUCT_USE_INCLUDES
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225 # include "arch/epstruct.h"
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228 #define TCPH_OFFSET(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 8)
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229 #define TCPH_HDRLEN(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 12)
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230 #define TCPH_FLAGS(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS)
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232 #define TCPH_OFFSET_SET(phdr, offset) (phdr)->_hdrlen_rsvd_flags = htons(((offset) << 8) | TCPH_FLAGS(phdr))
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233 #define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | TCPH_FLAGS(phdr))
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234 #define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = htons((ntohs((phdr)->_hdrlen_rsvd_flags) & ~TCP_FLAGS) | (flags))
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235 #define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) | (flags))
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236 #define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) | (TCPH_FLAGS(phdr) & ~(flags)) )
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238 #define TCP_TCPLEN(seg) ((seg)->len + ((TCPH_FLAGS((seg)->tcphdr) & TCP_FIN || \
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239 TCPH_FLAGS((seg)->tcphdr) & TCP_SYN)? 1: 0))
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255 /** Flags used on input processing, not on pcb->flags
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257 #define TF_RESET (u8_t)0x08U /* Connection was reset. */
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258 #define TF_CLOSED (u8_t)0x10U /* Connection was sucessfully closed. */
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259 #define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */
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262 * members common to struct tcp_pcb and struct tcp_listen_pcb
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264 #define TCP_PCB_COMMON(type) \
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265 type *next; /* for the linked list */ \
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266 enum tcp_state state; /* TCP state */ \
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268 void *callback_arg; \
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269 /* ports are in host byte order */ \
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272 /* the TCP protocol control block */
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274 /** common PCB members */
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276 /** protocol specific PCB members */
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277 TCP_PCB_COMMON(struct tcp_pcb);
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279 /* ports are in host byte order */
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283 #define TF_ACK_DELAY (u8_t)0x01U /* Delayed ACK. */
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284 #define TF_ACK_NOW (u8_t)0x02U /* Immediate ACK. */
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285 #define TF_INFR (u8_t)0x04U /* In fast recovery. */
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286 #define TF_FIN (u8_t)0x20U /* Connection was closed locally (FIN segment enqueued). */
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287 #define TF_NODELAY (u8_t)0x40U /* Disable Nagle algorithm */
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288 #define TF_NAGLEMEMERR (u8_t)0x80U /* nagle enabled, memerr, try to output to prevent delayed ACK to happen */
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290 /* the rest of the fields are in host byte order
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291 as we have to do some math with them */
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292 /* receiver variables */
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293 u32_t rcv_nxt; /* next seqno expected */
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294 u16_t rcv_wnd; /* receiver window */
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295 u16_t rcv_ann_wnd; /* announced receive window */
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299 u8_t polltmr, pollinterval;
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301 /* Retransmission timer. */
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304 u16_t mss; /* maximum segment size */
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306 /* RTT (round trip time) estimation variables */
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307 u32_t rttest; /* RTT estimate in 500ms ticks */
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308 u32_t rtseq; /* sequence number being timed */
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309 s16_t sa, sv; /* @todo document this */
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311 s16_t rto; /* retransmission time-out */
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312 u8_t nrtx; /* number of retransmissions */
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314 /* fast retransmit/recovery */
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315 u32_t lastack; /* Highest acknowledged seqno. */
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318 /* congestion avoidance/control variables */
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322 /* sender variables */
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323 u32_t snd_nxt, /* next seqno to be sent */
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324 snd_max; /* Highest seqno sent. */
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325 u16_t snd_wnd; /* sender window */
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326 u32_t snd_wl1, snd_wl2, /* Sequence and acknowledgement numbers of last
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328 snd_lbb; /* Sequence number of next byte to be buffered. */
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332 u16_t snd_buf; /* Available buffer space for sending (in bytes). */
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333 #define TCP_SNDQUEUELEN_OVERFLOW (0xffff-3)
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334 u16_t snd_queuelen; /* Available buffer space for sending (in tcp_segs). */
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337 /* These are ordered by sequence number: */
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338 struct tcp_seg *unsent; /* Unsent (queued) segments. */
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339 struct tcp_seg *unacked; /* Sent but unacknowledged segments. */
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340 #if TCP_QUEUE_OOSEQ
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341 struct tcp_seg *ooseq; /* Received out of sequence segments. */
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342 #endif /* TCP_QUEUE_OOSEQ */
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344 struct pbuf *refused_data; /* Data previously received but not yet taken by upper layer */
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346 #if LWIP_CALLBACK_API
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347 /* Function to be called when more send buffer space is available.
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348 * @param arg user-supplied argument (tcp_pcb.callback_arg)
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349 * @param pcb the tcp_pcb which has send buffer space available
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350 * @param space the amount of bytes available
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351 * @return ERR_OK: try to send some data by calling tcp_output
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353 err_t (* sent)(void *arg, struct tcp_pcb *pcb, u16_t space);
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355 /* Function to be called when (in-sequence) data has arrived.
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356 * @param arg user-supplied argument (tcp_pcb.callback_arg)
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357 * @param pcb the tcp_pcb for which data has arrived
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358 * @param p the packet buffer which arrived
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359 * @param err an error argument (TODO: that is current always ERR_OK?)
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360 * @return ERR_OK: try to send some data by calling tcp_output
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362 err_t (* recv)(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
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364 /* Function to be called when a connection has been set up.
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365 * @param arg user-supplied argument (tcp_pcb.callback_arg)
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366 * @param pcb the tcp_pcb that now is connected
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367 * @param err an error argument (TODO: that is current always ERR_OK?)
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368 * @return value is currently ignored
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370 err_t (* connected)(void *arg, struct tcp_pcb *pcb, err_t err);
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372 /* Function to call when a listener has been connected.
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373 * @param arg user-supplied argument (tcp_pcb.callback_arg)
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374 * @param pcb a new tcp_pcb that now is connected
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375 * @param err an error argument (TODO: that is current always ERR_OK?)
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376 * @return ERR_OK: accept the new connection,
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377 * any other err_t abortsthe new connection
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379 err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err);
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381 /* Function which is called periodically.
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382 * The period can be adjusted in multiples of the TCP slow timer interval
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383 * by changing tcp_pcb.polltmr.
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384 * @param arg user-supplied argument (tcp_pcb.callback_arg)
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385 * @param pcb the tcp_pcb to poll for
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386 * @return ERR_OK: try to send some data by calling tcp_output
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388 err_t (* poll)(void *arg, struct tcp_pcb *pcb);
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390 /* Function to be called whenever a fatal error occurs.
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391 * There is no pcb parameter since most of the times, the pcb is
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392 * already deallocated (or there is no pcb) when this function is called.
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393 * @param arg user-supplied argument (tcp_pcb.callback_arg)
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394 * @param err an indication why the error callback is called:
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395 * ERR_ABRT: aborted through tcp_abort or by a TCP timer
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396 * ERR_RST: the connection was reset by the remote host
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398 void (* errf)(void *arg, err_t err);
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399 #endif /* LWIP_CALLBACK_API */
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401 /* idle time before KEEPALIVE is sent */
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403 #if LWIP_TCP_KEEPALIVE
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406 #endif /* LWIP_TCP_KEEPALIVE */
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408 /* Persist timer counter */
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410 /* Persist timer back-off */
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411 u8_t persist_backoff;
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413 /* KEEPALIVE counter */
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414 u8_t keep_cnt_sent;
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417 struct tcp_pcb_listen {
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418 /* Common members of all PCB types */
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420 /* Protocol specific PCB members */
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421 TCP_PCB_COMMON(struct tcp_pcb_listen);
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423 #if LWIP_CALLBACK_API
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424 /* Function to call when a listener has been connected.
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425 * @param arg user-supplied argument (tcp_pcb.callback_arg)
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426 * @param pcb a new tcp_pcb that now is connected
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427 * @param err an error argument (TODO: that is current always ERR_OK?)
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428 * @return ERR_OK: accept the new connection,
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429 * any other err_t abortsthe new connection
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431 err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err);
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432 #endif /* LWIP_CALLBACK_API */
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433 #if TCP_LISTEN_BACKLOG
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435 u8_t accepts_pending;
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436 #endif /* TCP_LISTEN_BACKLOG */
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445 LWIP_EVENT_CONNECTED,
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450 err_t lwip_tcp_event(void *arg, struct tcp_pcb *pcb,
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456 #define TCP_EVENT_ACCEPT(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
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457 LWIP_EVENT_ACCEPT, NULL, 0, err)
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458 #define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
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459 LWIP_EVENT_SENT, NULL, space, ERR_OK)
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460 #define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
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461 LWIP_EVENT_RECV, (p), 0, (err))
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462 #define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
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463 LWIP_EVENT_CONNECTED, NULL, 0, (err))
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464 #define TCP_EVENT_POLL(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
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465 LWIP_EVENT_POLL, NULL, 0, ERR_OK)
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466 #define TCP_EVENT_ERR(errf,arg,err) lwip_tcp_event((arg), NULL, \
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467 LWIP_EVENT_ERR, NULL, 0, (err))
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468 #else /* LWIP_EVENT_API */
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469 #define TCP_EVENT_ACCEPT(pcb,err,ret) \
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470 if((pcb)->accept != NULL) \
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471 (ret = (pcb)->accept((pcb)->callback_arg,(pcb),(err)))
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472 #define TCP_EVENT_SENT(pcb,space,ret) \
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473 if((pcb)->sent != NULL) \
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474 (ret = (pcb)->sent((pcb)->callback_arg,(pcb),(space)))
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475 #define TCP_EVENT_RECV(pcb,p,err,ret) \
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476 if((pcb)->recv != NULL) \
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477 { ret = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err)); } else { \
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479 if (p) pbuf_free(p); }
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480 #define TCP_EVENT_CONNECTED(pcb,err,ret) \
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481 if((pcb)->connected != NULL) \
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482 (ret = (pcb)->connected((pcb)->callback_arg,(pcb),(err)))
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483 #define TCP_EVENT_POLL(pcb,ret) \
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484 if((pcb)->poll != NULL) \
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485 (ret = (pcb)->poll((pcb)->callback_arg,(pcb)))
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486 #define TCP_EVENT_ERR(errf,arg,err) \
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487 if((errf) != NULL) \
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488 (errf)((arg),(err))
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489 #endif /* LWIP_EVENT_API */
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491 /* This structure represents a TCP segment on the unsent and unacked queues */
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493 struct tcp_seg *next; /* used when putting segements on a queue */
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494 struct pbuf *p; /* buffer containing data + TCP header */
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495 void *dataptr; /* pointer to the TCP data in the pbuf */
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496 u16_t len; /* the TCP length of this segment */
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497 struct tcp_hdr *tcphdr; /* the TCP header */
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500 /* Internal functions and global variables: */
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501 struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb);
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502 void tcp_pcb_purge(struct tcp_pcb *pcb);
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503 void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb);
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505 u8_t tcp_segs_free(struct tcp_seg *seg);
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506 u8_t tcp_seg_free(struct tcp_seg *seg);
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507 struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg);
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509 #define tcp_ack(pcb) if((pcb)->flags & TF_ACK_DELAY) { \
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510 (pcb)->flags &= ~TF_ACK_DELAY; \
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511 (pcb)->flags |= TF_ACK_NOW; \
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514 (pcb)->flags |= TF_ACK_DELAY; \
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517 #define tcp_ack_now(pcb) (pcb)->flags |= TF_ACK_NOW; \
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520 err_t tcp_send_ctrl(struct tcp_pcb *pcb, u8_t flags);
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521 err_t tcp_enqueue(struct tcp_pcb *pcb, void *dataptr, u16_t len,
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522 u8_t flags, u8_t apiflags,
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523 u8_t *optdata, u8_t optlen);
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525 void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg);
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527 void tcp_rst(u32_t seqno, u32_t ackno,
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528 struct ip_addr *local_ip, struct ip_addr *remote_ip,
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529 u16_t local_port, u16_t remote_port);
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531 u32_t tcp_next_iss(void);
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533 void tcp_keepalive(struct tcp_pcb *pcb);
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534 void tcp_zero_window_probe(struct tcp_pcb *pcb);
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536 #if TCP_CALCULATE_EFF_SEND_MSS
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537 u16_t tcp_eff_send_mss(u16_t sendmss, struct ip_addr *addr);
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538 #endif /* TCP_CALCULATE_EFF_SEND_MSS */
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540 extern struct tcp_pcb *tcp_input_pcb;
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541 extern u32_t tcp_ticks;
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543 #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
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544 void tcp_debug_print(struct tcp_hdr *tcphdr);
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545 void tcp_debug_print_flags(u8_t flags);
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546 void tcp_debug_print_state(enum tcp_state s);
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547 void tcp_debug_print_pcbs(void);
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548 s16_t tcp_pcbs_sane(void);
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550 # define tcp_debug_print(tcphdr)
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551 # define tcp_debug_print_flags(flags)
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552 # define tcp_debug_print_state(s)
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553 # define tcp_debug_print_pcbs()
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554 # define tcp_pcbs_sane() 1
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555 #endif /* TCP_DEBUG */
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558 #define tcp_timer_needed()
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560 void tcp_timer_needed(void);
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563 /* The TCP PCB lists. */
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564 union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */
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565 struct tcp_pcb_listen *listen_pcbs;
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566 struct tcp_pcb *pcbs;
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568 extern union tcp_listen_pcbs_t tcp_listen_pcbs;
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569 extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a
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570 state in which they accept or send
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572 extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */
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574 extern struct tcp_pcb *tcp_tmp_pcb; /* Only used for temporary storage. */
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576 /* Axioms about the above lists:
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577 1) Every TCP PCB that is not CLOSED is in one of the lists.
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578 2) A PCB is only in one of the lists.
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579 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
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580 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
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583 /* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
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584 with a PCB list or removes a PCB from a list, respectively. */
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586 #define TCP_REG(pcbs, npcb) do {\
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587 LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", npcb, npcb->local_port)); \
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588 for(tcp_tmp_pcb = *pcbs; \
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589 tcp_tmp_pcb != NULL; \
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590 tcp_tmp_pcb = tcp_tmp_pcb->next) { \
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591 LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != npcb); \
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593 LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", npcb->state != CLOSED); \
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594 npcb->next = *pcbs; \
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595 LWIP_ASSERT("TCP_REG: npcb->next != npcb", npcb->next != npcb); \
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597 LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
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598 tcp_timer_needed(); \
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600 #define TCP_RMV(pcbs, npcb) do { \
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601 LWIP_ASSERT("TCP_RMV: pcbs != NULL", *pcbs != NULL); \
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602 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", npcb, *pcbs)); \
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603 if(*pcbs == npcb) { \
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604 *pcbs = (*pcbs)->next; \
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605 } else for(tcp_tmp_pcb = *pcbs; tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
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606 if(tcp_tmp_pcb->next != NULL && tcp_tmp_pcb->next == npcb) { \
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607 tcp_tmp_pcb->next = npcb->next; \
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611 npcb->next = NULL; \
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612 LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
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613 LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", npcb, *pcbs)); \
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616 #else /* LWIP_DEBUG */
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617 #define TCP_REG(pcbs, npcb) do { \
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618 npcb->next = *pcbs; \
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620 tcp_timer_needed(); \
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622 #define TCP_RMV(pcbs, npcb) do { \
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623 if(*(pcbs) == npcb) { \
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624 (*(pcbs)) = (*pcbs)->next; \
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625 } else for(tcp_tmp_pcb = *pcbs; tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
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626 if(tcp_tmp_pcb->next != NULL && tcp_tmp_pcb->next == npcb) { \
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627 tcp_tmp_pcb->next = npcb->next; \
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631 npcb->next = NULL; \
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633 #endif /* LWIP_DEBUG */
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639 #endif /* LWIP_TCP */
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641 #endif /* __LWIP_TCP_H__ */
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