BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file |
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3 | * TCP internal implementations (do not use in application code) |
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4 | */ |
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5 | |||
6 | /* |
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7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
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8 | * All rights reserved. |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without modification, |
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11 | * are permitted provided that the following conditions are met: |
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12 | * |
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13 | * 1. Redistributions of source code must retain the above copyright notice, |
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14 | * this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
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16 | * this list of conditions and the following disclaimer in the documentation |
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17 | * and/or other materials provided with the distribution. |
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18 | * 3. The name of the author may not be used to endorse or promote products |
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19 | * derived from this software without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
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30 | * OF SUCH DAMAGE. |
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31 | * |
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32 | * This file is part of the lwIP TCP/IP stack. |
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33 | * |
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34 | * Author: Adam Dunkels <adam@sics.se> |
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35 | * |
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36 | */ |
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37 | #ifndef LWIP_HDR_TCP_PRIV_H |
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38 | #define LWIP_HDR_TCP_PRIV_H |
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39 | |||
40 | #include "lwip/opt.h" |
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41 | |||
42 | #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */ |
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43 | |||
44 | #include "lwip/tcp.h" |
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45 | #include "lwip/mem.h" |
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46 | #include "lwip/pbuf.h" |
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47 | #include "lwip/ip.h" |
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48 | #include "lwip/icmp.h" |
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49 | #include "lwip/err.h" |
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50 | #include "lwip/ip6.h" |
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51 | #include "lwip/ip6_addr.h" |
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52 | #include "lwip/prot/tcp.h" |
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53 | |||
54 | #ifdef __cplusplus |
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55 | extern "C" { |
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56 | #endif |
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57 | |||
58 | /* Functions for interfacing with TCP: */ |
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59 | |||
60 | /* Lower layer interface to TCP: */ |
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61 | void tcp_init (void); /* Initialize this module. */ |
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62 | void tcp_tmr (void); /* Must be called every |
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63 | TCP_TMR_INTERVAL |
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64 | ms. (Typically 250 ms). */ |
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65 | /* It is also possible to call these two functions at the right |
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66 | intervals (instead of calling tcp_tmr()). */ |
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67 | void tcp_slowtmr (void); |
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68 | void tcp_fasttmr (void); |
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69 | |||
70 | /* Call this from a netif driver (watch out for threading issues!) that has |
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71 | returned a memory error on transmit and now has free buffers to send more. |
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72 | This iterates all active pcbs that had an error and tries to call |
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73 | tcp_output, so use this with care as it might slow down the system. */ |
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74 | void tcp_txnow (void); |
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75 | |||
76 | /* Only used by IP to pass a TCP segment to TCP: */ |
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77 | void tcp_input (struct pbuf *p, struct netif *inp); |
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78 | /* Used within the TCP code only: */ |
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79 | struct tcp_pcb * tcp_alloc (u8_t prio); |
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80 | void tcp_abandon (struct tcp_pcb *pcb, int reset); |
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81 | err_t tcp_send_empty_ack(struct tcp_pcb *pcb); |
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82 | err_t tcp_rexmit (struct tcp_pcb *pcb); |
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83 | err_t tcp_rexmit_rto_prepare(struct tcp_pcb *pcb); |
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84 | void tcp_rexmit_rto_commit(struct tcp_pcb *pcb); |
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85 | void tcp_rexmit_rto (struct tcp_pcb *pcb); |
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86 | void tcp_rexmit_fast (struct tcp_pcb *pcb); |
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87 | u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb); |
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88 | err_t tcp_process_refused_data(struct tcp_pcb *pcb); |
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89 | |||
90 | /** |
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91 | * This is the Nagle algorithm: try to combine user data to send as few TCP |
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92 | * segments as possible. Only send if |
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93 | * - no previously transmitted data on the connection remains unacknowledged or |
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94 | * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or |
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95 | * - the only unsent segment is at least pcb->mss bytes long (or there is more |
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96 | * than one unsent segment - with lwIP, this can happen although unsent->len < mss) |
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97 | * - or if we are in fast-retransmit (TF_INFR) |
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98 | */ |
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99 | #define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \ |
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100 | ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \ |
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101 | (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \ |
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102 | ((tpcb)->unsent->len >= (tpcb)->mss))) || \ |
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103 | ((tcp_sndbuf(tpcb) == 0) || (tcp_sndqueuelen(tpcb) >= TCP_SND_QUEUELEN)) \ |
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104 | ) ? 1 : 0) |
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105 | #define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK) |
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106 | |||
107 | |||
108 | #define TCP_SEQ_LT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) < 0) |
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109 | #define TCP_SEQ_LEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) <= 0) |
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110 | #define TCP_SEQ_GT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) > 0) |
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111 | #define TCP_SEQ_GEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) >= 0) |
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112 | /* is b<=a<=c? */ |
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113 | #if 0 /* see bug #10548 */ |
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114 | #define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b)) |
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115 | #endif |
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116 | #define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c)) |
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117 | |||
118 | #ifndef TCP_TMR_INTERVAL |
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119 | #define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */ |
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120 | #endif /* TCP_TMR_INTERVAL */ |
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121 | |||
122 | #ifndef TCP_FAST_INTERVAL |
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123 | #define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */ |
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124 | #endif /* TCP_FAST_INTERVAL */ |
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125 | |||
126 | #ifndef TCP_SLOW_INTERVAL |
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127 | #define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */ |
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128 | #endif /* TCP_SLOW_INTERVAL */ |
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129 | |||
130 | #define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */ |
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131 | #define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */ |
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132 | |||
133 | #define TCP_OOSEQ_TIMEOUT 6U /* x RTO */ |
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134 | |||
135 | #ifndef TCP_MSL |
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136 | #define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */ |
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137 | #endif |
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138 | |||
139 | /* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */ |
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140 | #ifndef TCP_KEEPIDLE_DEFAULT |
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141 | #define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */ |
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142 | #endif |
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143 | |||
144 | #ifndef TCP_KEEPINTVL_DEFAULT |
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145 | #define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */ |
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146 | #endif |
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147 | |||
148 | #ifndef TCP_KEEPCNT_DEFAULT |
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149 | #define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */ |
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150 | #endif |
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151 | |||
152 | #define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */ |
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153 | |||
154 | #define TCP_TCPLEN(seg) ((seg)->len + (((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0) ? 1U : 0U)) |
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155 | |||
156 | /** Flags used on input processing, not on pcb->flags |
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157 | */ |
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158 | #define TF_RESET (u8_t)0x08U /* Connection was reset. */ |
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159 | #define TF_CLOSED (u8_t)0x10U /* Connection was successfully closed. */ |
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160 | #define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */ |
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161 | |||
162 | |||
163 | #if LWIP_EVENT_API |
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164 | |||
165 | #define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) ret = lwip_tcp_event(arg, (pcb),\ |
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166 | LWIP_EVENT_ACCEPT, NULL, 0, err) |
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167 | #define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ |
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168 | LWIP_EVENT_SENT, NULL, space, ERR_OK) |
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169 | #define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ |
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170 | LWIP_EVENT_RECV, (p), 0, (err)) |
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171 | #define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ |
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172 | LWIP_EVENT_RECV, NULL, 0, ERR_OK) |
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173 | #define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\ |
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174 | LWIP_EVENT_CONNECTED, NULL, 0, (err)) |
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175 | #define TCP_EVENT_POLL(pcb,ret) do { if ((pcb)->state != SYN_RCVD) { \ |
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176 | ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_POLL, NULL, 0, ERR_OK); \ |
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177 | } else { \ |
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178 | ret = ERR_ARG; } } while(0) |
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179 | #define TCP_EVENT_ERR(last_state,errf,arg,err) do { if (last_state != SYN_RCVD) { \ |
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180 | lwip_tcp_event((arg), NULL, LWIP_EVENT_ERR, NULL, 0, (err)); } } while(0) |
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181 | |||
182 | #else /* LWIP_EVENT_API */ |
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183 | |||
184 | #define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) \ |
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185 | do { \ |
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186 | if((lpcb)->accept != NULL) \ |
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187 | (ret) = (lpcb)->accept((arg),(pcb),(err)); \ |
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188 | else (ret) = ERR_ARG; \ |
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189 | } while (0) |
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190 | |||
191 | #define TCP_EVENT_SENT(pcb,space,ret) \ |
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192 | do { \ |
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193 | if((pcb)->sent != NULL) \ |
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194 | (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \ |
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195 | else (ret) = ERR_OK; \ |
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196 | } while (0) |
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197 | |||
198 | #define TCP_EVENT_RECV(pcb,p,err,ret) \ |
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199 | do { \ |
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200 | if((pcb)->recv != NULL) { \ |
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201 | (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\ |
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202 | } else { \ |
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203 | (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \ |
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204 | } \ |
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205 | } while (0) |
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206 | |||
207 | #define TCP_EVENT_CLOSED(pcb,ret) \ |
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208 | do { \ |
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209 | if(((pcb)->recv != NULL)) { \ |
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210 | (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\ |
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211 | } else { \ |
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212 | (ret) = ERR_OK; \ |
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213 | } \ |
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214 | } while (0) |
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215 | |||
216 | #define TCP_EVENT_CONNECTED(pcb,err,ret) \ |
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217 | do { \ |
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218 | if((pcb)->connected != NULL) \ |
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219 | (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \ |
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220 | else (ret) = ERR_OK; \ |
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221 | } while (0) |
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222 | |||
223 | #define TCP_EVENT_POLL(pcb,ret) \ |
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224 | do { \ |
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225 | if((pcb)->poll != NULL) \ |
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226 | (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \ |
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227 | else (ret) = ERR_OK; \ |
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228 | } while (0) |
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229 | |||
230 | #define TCP_EVENT_ERR(last_state,errf,arg,err) \ |
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231 | do { \ |
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232 | LWIP_UNUSED_ARG(last_state); \ |
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233 | if((errf) != NULL) \ |
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234 | (errf)((arg),(err)); \ |
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235 | } while (0) |
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236 | |||
237 | #endif /* LWIP_EVENT_API */ |
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238 | |||
239 | /** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */ |
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240 | #if TCP_OVERSIZE && defined(LWIP_DEBUG) |
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241 | #define TCP_OVERSIZE_DBGCHECK 1 |
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242 | #else |
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243 | #define TCP_OVERSIZE_DBGCHECK 0 |
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244 | #endif |
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245 | |||
246 | /** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */ |
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247 | #define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP) |
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248 | |||
249 | /* This structure represents a TCP segment on the unsent, unacked and ooseq queues */ |
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250 | struct tcp_seg { |
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251 | struct tcp_seg *next; /* used when putting segments on a queue */ |
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252 | struct pbuf *p; /* buffer containing data + TCP header */ |
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253 | u16_t len; /* the TCP length of this segment */ |
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254 | #if TCP_OVERSIZE_DBGCHECK |
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255 | u16_t oversize_left; /* Extra bytes available at the end of the last |
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256 | pbuf in unsent (used for asserting vs. |
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257 | tcp_pcb.unsent_oversize only) */ |
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258 | #endif /* TCP_OVERSIZE_DBGCHECK */ |
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259 | #if TCP_CHECKSUM_ON_COPY |
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260 | u16_t chksum; |
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261 | u8_t chksum_swapped; |
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262 | #endif /* TCP_CHECKSUM_ON_COPY */ |
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263 | u8_t flags; |
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264 | #define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option. */ |
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265 | #define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */ |
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266 | #define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is |
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267 | checksummed into 'chksum' */ |
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268 | #define TF_SEG_OPTS_WND_SCALE (u8_t)0x08U /* Include WND SCALE option */ |
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269 | #define TF_SEG_OPTS_SACK_PERM (u8_t)0x10U /* Include SACK Permitted option */ |
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270 | struct tcp_hdr *tcphdr; /* the TCP header */ |
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271 | }; |
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272 | |||
273 | #define LWIP_TCP_OPT_EOL 0 |
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274 | #define LWIP_TCP_OPT_NOP 1 |
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275 | #define LWIP_TCP_OPT_MSS 2 |
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276 | #define LWIP_TCP_OPT_WS 3 |
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277 | #define LWIP_TCP_OPT_SACK_PERM 4 |
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278 | #define LWIP_TCP_OPT_TS 8 |
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279 | |||
280 | #define LWIP_TCP_OPT_LEN_MSS 4 |
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281 | #if LWIP_TCP_TIMESTAMPS |
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282 | #define LWIP_TCP_OPT_LEN_TS 10 |
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283 | #define LWIP_TCP_OPT_LEN_TS_OUT 12 /* aligned for output (includes NOP padding) */ |
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284 | #else |
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285 | #define LWIP_TCP_OPT_LEN_TS_OUT 0 |
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286 | #endif |
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287 | #if LWIP_WND_SCALE |
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288 | #define LWIP_TCP_OPT_LEN_WS 3 |
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289 | #define LWIP_TCP_OPT_LEN_WS_OUT 4 /* aligned for output (includes NOP padding) */ |
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290 | #else |
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291 | #define LWIP_TCP_OPT_LEN_WS_OUT 0 |
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292 | #endif |
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293 | |||
294 | #if LWIP_TCP_SACK_OUT |
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295 | #define LWIP_TCP_OPT_LEN_SACK_PERM 2 |
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296 | #define LWIP_TCP_OPT_LEN_SACK_PERM_OUT 4 /* aligned for output (includes NOP padding) */ |
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297 | #else |
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298 | #define LWIP_TCP_OPT_LEN_SACK_PERM_OUT 0 |
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299 | #endif |
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300 | |||
301 | #define LWIP_TCP_OPT_LENGTH(flags) \ |
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302 | (flags & TF_SEG_OPTS_MSS ? LWIP_TCP_OPT_LEN_MSS : 0) + \ |
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303 | (flags & TF_SEG_OPTS_TS ? LWIP_TCP_OPT_LEN_TS_OUT : 0) + \ |
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304 | (flags & TF_SEG_OPTS_WND_SCALE ? LWIP_TCP_OPT_LEN_WS_OUT : 0) + \ |
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305 | (flags & TF_SEG_OPTS_SACK_PERM ? LWIP_TCP_OPT_LEN_SACK_PERM_OUT : 0) |
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306 | |||
307 | /** This returns a TCP header option for MSS in an u32_t */ |
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308 | #define TCP_BUILD_MSS_OPTION(mss) lwip_htonl(0x02040000 | ((mss) & 0xFFFF)) |
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309 | |||
310 | #if LWIP_WND_SCALE |
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311 | #define TCPWNDSIZE_F U32_F |
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312 | #define TCPWND_MAX 0xFFFFFFFFU |
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313 | #define TCPWND_CHECK16(x) LWIP_ASSERT("window size > 0xFFFF", (x) <= 0xFFFF) |
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314 | #define TCPWND_MIN16(x) ((u16_t)LWIP_MIN((x), 0xFFFF)) |
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315 | #else /* LWIP_WND_SCALE */ |
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316 | #define TCPWNDSIZE_F U16_F |
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317 | #define TCPWND_MAX 0xFFFFU |
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318 | #define TCPWND_CHECK16(x) |
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319 | #define TCPWND_MIN16(x) x |
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320 | #endif /* LWIP_WND_SCALE */ |
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321 | |||
322 | /* Global variables: */ |
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323 | extern struct tcp_pcb *tcp_input_pcb; |
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324 | extern u32_t tcp_ticks; |
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325 | extern u8_t tcp_active_pcbs_changed; |
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326 | |||
327 | /* The TCP PCB lists. */ |
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328 | union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */ |
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329 | struct tcp_pcb_listen *listen_pcbs; |
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330 | struct tcp_pcb *pcbs; |
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331 | }; |
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332 | extern struct tcp_pcb *tcp_bound_pcbs; |
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333 | extern union tcp_listen_pcbs_t tcp_listen_pcbs; |
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334 | extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a |
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335 | state in which they accept or send |
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336 | data. */ |
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337 | extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */ |
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338 | |||
339 | #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3 |
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340 | #define NUM_TCP_PCB_LISTS 4 |
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341 | extern struct tcp_pcb ** const tcp_pcb_lists[NUM_TCP_PCB_LISTS]; |
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342 | |||
343 | /* Axioms about the above lists: |
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344 | 1) Every TCP PCB that is not CLOSED is in one of the lists. |
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345 | 2) A PCB is only in one of the lists. |
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346 | 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state. |
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347 | 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state. |
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348 | */ |
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349 | /* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB |
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350 | with a PCB list or removes a PCB from a list, respectively. */ |
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351 | #ifndef TCP_DEBUG_PCB_LISTS |
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352 | #define TCP_DEBUG_PCB_LISTS 0 |
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353 | #endif |
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354 | #if TCP_DEBUG_PCB_LISTS |
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355 | #define TCP_REG(pcbs, npcb) do {\ |
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356 | struct tcp_pcb *tcp_tmp_pcb; \ |
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357 | LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", (npcb), (npcb)->local_port)); \ |
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358 | for (tcp_tmp_pcb = *(pcbs); \ |
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359 | tcp_tmp_pcb != NULL; \ |
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360 | tcp_tmp_pcb = tcp_tmp_pcb->next) { \ |
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361 | LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \ |
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362 | } \ |
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363 | LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \ |
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364 | (npcb)->next = *(pcbs); \ |
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365 | LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \ |
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366 | *(pcbs) = (npcb); \ |
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367 | LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \ |
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368 | tcp_timer_needed(); \ |
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369 | } while(0) |
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370 | #define TCP_RMV(pcbs, npcb) do { \ |
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371 | struct tcp_pcb *tcp_tmp_pcb; \ |
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372 | LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \ |
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373 | LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (npcb), *(pcbs))); \ |
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374 | if(*(pcbs) == (npcb)) { \ |
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375 | *(pcbs) = (*pcbs)->next; \ |
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376 | } else for (tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \ |
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377 | if(tcp_tmp_pcb->next == (npcb)) { \ |
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378 | tcp_tmp_pcb->next = (npcb)->next; \ |
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379 | break; \ |
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380 | } \ |
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381 | } \ |
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382 | (npcb)->next = NULL; \ |
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383 | LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \ |
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384 | LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (npcb), *(pcbs))); \ |
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385 | } while(0) |
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386 | |||
387 | #else /* LWIP_DEBUG */ |
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388 | |||
389 | #define TCP_REG(pcbs, npcb) \ |
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390 | do { \ |
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391 | (npcb)->next = *pcbs; \ |
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392 | *(pcbs) = (npcb); \ |
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393 | tcp_timer_needed(); \ |
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394 | } while (0) |
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395 | |||
396 | #define TCP_RMV(pcbs, npcb) \ |
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397 | do { \ |
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398 | if(*(pcbs) == (npcb)) { \ |
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399 | (*(pcbs)) = (*pcbs)->next; \ |
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400 | } \ |
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401 | else { \ |
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402 | struct tcp_pcb *tcp_tmp_pcb; \ |
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403 | for (tcp_tmp_pcb = *pcbs; \ |
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404 | tcp_tmp_pcb != NULL; \ |
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405 | tcp_tmp_pcb = tcp_tmp_pcb->next) { \ |
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406 | if(tcp_tmp_pcb->next == (npcb)) { \ |
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407 | tcp_tmp_pcb->next = (npcb)->next; \ |
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408 | break; \ |
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409 | } \ |
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410 | } \ |
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411 | } \ |
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412 | (npcb)->next = NULL; \ |
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413 | } while(0) |
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414 | |||
415 | #endif /* LWIP_DEBUG */ |
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416 | |||
417 | #define TCP_REG_ACTIVE(npcb) \ |
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418 | do { \ |
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419 | TCP_REG(&tcp_active_pcbs, npcb); \ |
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420 | tcp_active_pcbs_changed = 1; \ |
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421 | } while (0) |
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422 | |||
423 | #define TCP_RMV_ACTIVE(npcb) \ |
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424 | do { \ |
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425 | TCP_RMV(&tcp_active_pcbs, npcb); \ |
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426 | tcp_active_pcbs_changed = 1; \ |
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427 | } while (0) |
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428 | |||
429 | #define TCP_PCB_REMOVE_ACTIVE(pcb) \ |
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430 | do { \ |
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431 | tcp_pcb_remove(&tcp_active_pcbs, pcb); \ |
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432 | tcp_active_pcbs_changed = 1; \ |
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433 | } while (0) |
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434 | |||
435 | |||
436 | /* Internal functions: */ |
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437 | struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb); |
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438 | void tcp_pcb_purge(struct tcp_pcb *pcb); |
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439 | void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb); |
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440 | |||
441 | void tcp_segs_free(struct tcp_seg *seg); |
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442 | void tcp_seg_free(struct tcp_seg *seg); |
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443 | struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg); |
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444 | |||
445 | #define tcp_ack(pcb) \ |
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446 | do { \ |
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447 | if((pcb)->flags & TF_ACK_DELAY) { \ |
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448 | tcp_clear_flags(pcb, TF_ACK_DELAY); \ |
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449 | tcp_ack_now(pcb); \ |
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450 | } \ |
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451 | else { \ |
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452 | tcp_set_flags(pcb, TF_ACK_DELAY); \ |
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453 | } \ |
||
454 | } while (0) |
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455 | |||
456 | #define tcp_ack_now(pcb) \ |
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457 | tcp_set_flags(pcb, TF_ACK_NOW) |
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458 | |||
459 | err_t tcp_send_fin(struct tcp_pcb *pcb); |
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460 | err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags); |
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461 | |||
462 | void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg); |
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463 | |||
464 | void tcp_rst(const struct tcp_pcb* pcb, u32_t seqno, u32_t ackno, |
||
465 | const ip_addr_t *local_ip, const ip_addr_t *remote_ip, |
||
466 | u16_t local_port, u16_t remote_port); |
||
467 | |||
468 | u32_t tcp_next_iss(struct tcp_pcb *pcb); |
||
469 | |||
470 | err_t tcp_keepalive(struct tcp_pcb *pcb); |
||
471 | err_t tcp_split_unsent_seg(struct tcp_pcb *pcb, u16_t split); |
||
472 | err_t tcp_zero_window_probe(struct tcp_pcb *pcb); |
||
473 | void tcp_trigger_input_pcb_close(void); |
||
474 | |||
475 | #if TCP_CALCULATE_EFF_SEND_MSS |
||
476 | u16_t tcp_eff_send_mss_netif(u16_t sendmss, struct netif *outif, |
||
477 | const ip_addr_t *dest); |
||
478 | #define tcp_eff_send_mss(sendmss, src, dest) \ |
||
479 | tcp_eff_send_mss_netif(sendmss, ip_route(src, dest), dest) |
||
480 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */ |
||
481 | |||
482 | #if LWIP_CALLBACK_API |
||
483 | err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err); |
||
484 | #endif /* LWIP_CALLBACK_API */ |
||
485 | |||
486 | #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG |
||
487 | void tcp_debug_print(struct tcp_hdr *tcphdr); |
||
488 | void tcp_debug_print_flags(u8_t flags); |
||
489 | void tcp_debug_print_state(enum tcp_state s); |
||
490 | void tcp_debug_print_pcbs(void); |
||
491 | s16_t tcp_pcbs_sane(void); |
||
492 | #else |
||
493 | # define tcp_debug_print(tcphdr) |
||
494 | # define tcp_debug_print_flags(flags) |
||
495 | # define tcp_debug_print_state(s) |
||
496 | # define tcp_debug_print_pcbs() |
||
497 | # define tcp_pcbs_sane() 1 |
||
498 | #endif /* TCP_DEBUG */ |
||
499 | |||
500 | /** External function (implemented in timers.c), called when TCP detects |
||
501 | * that a timer is needed (i.e. active- or time-wait-pcb found). */ |
||
502 | void tcp_timer_needed(void); |
||
503 | |||
504 | void tcp_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_addr); |
||
505 | |||
506 | #if TCP_QUEUE_OOSEQ |
||
507 | void tcp_free_ooseq(struct tcp_pcb *pcb); |
||
508 | #endif |
||
509 | |||
510 | #ifdef __cplusplus |
||
511 | } |
||
512 | #endif |
||
513 | |||
514 | #endif /* LWIP_TCP */ |
||
515 | |||
516 | #endif /* LWIP_HDR_TCP_PRIV_H */ |