[457] | 1 | /**
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| 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 |
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| 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 |
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| 40 | #include "lwip/opt.h"
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| 41 |
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| 42 | #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
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| 43 |
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| 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 |
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| 54 | #ifdef __cplusplus
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| 55 | extern "C" {
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| 56 | #endif
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| 57 |
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| 58 | /* Functions for interfacing with TCP: */
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| 59 |
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| 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 |
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| 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 |
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| 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_free (struct tcp_pcb *pcb);
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| 81 | void tcp_abandon (struct tcp_pcb *pcb, int reset);
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| 82 | err_t tcp_send_empty_ack(struct tcp_pcb *pcb);
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| 83 | err_t tcp_rexmit (struct tcp_pcb *pcb);
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| 84 | err_t tcp_rexmit_rto_prepare(struct tcp_pcb *pcb);
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| 85 | void tcp_rexmit_rto_commit(struct tcp_pcb *pcb);
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| 86 | void tcp_rexmit_rto (struct tcp_pcb *pcb);
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| 87 | void tcp_rexmit_fast (struct tcp_pcb *pcb);
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| 88 | u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb);
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| 89 | err_t tcp_process_refused_data(struct tcp_pcb *pcb);
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| 90 |
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| 91 | /**
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| 92 | * This is the Nagle algorithm: try to combine user data to send as few TCP
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| 93 | * segments as possible. Only send if
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| 94 | * - no previously transmitted data on the connection remains unacknowledged or
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| 95 | * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or
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| 96 | * - the only unsent segment is at least pcb->mss bytes long (or there is more
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| 97 | * than one unsent segment - with lwIP, this can happen although unsent->len < mss)
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| 98 | * - or if we are in fast-retransmit (TF_INFR)
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| 99 | */
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| 100 | #define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \
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| 101 | ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \
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| 102 | (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \
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| 103 | ((tpcb)->unsent->len >= (tpcb)->mss))) || \
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| 104 | ((tcp_sndbuf(tpcb) == 0) || (tcp_sndqueuelen(tpcb) >= TCP_SND_QUEUELEN)) \
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| 105 | ) ? 1 : 0)
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| 106 | #define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)
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| 107 |
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| 108 |
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| 109 | #define TCP_SEQ_LT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) < 0)
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| 110 | #define TCP_SEQ_LEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) <= 0)
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| 111 | #define TCP_SEQ_GT(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) > 0)
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| 112 | #define TCP_SEQ_GEQ(a,b) ((s32_t)((u32_t)(a) - (u32_t)(b)) >= 0)
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| 113 | /* is b<=a<=c? */
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| 114 | #if 0 /* see bug #10548 */
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| 115 | #define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
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| 116 | #endif
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| 117 | #define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
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| 118 |
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| 119 | #ifndef TCP_TMR_INTERVAL
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| 120 | #define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */
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| 121 | #endif /* TCP_TMR_INTERVAL */
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| 122 |
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| 123 | #ifndef TCP_FAST_INTERVAL
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| 124 | #define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */
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| 125 | #endif /* TCP_FAST_INTERVAL */
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| 126 |
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| 127 | #ifndef TCP_SLOW_INTERVAL
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| 128 | #define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */
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| 129 | #endif /* TCP_SLOW_INTERVAL */
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| 130 |
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| 131 | #define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
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| 132 | #define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */
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| 133 |
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| 134 | #define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
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| 135 |
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| 136 | #ifndef TCP_MSL
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| 137 | #define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */
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| 138 | #endif
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| 139 |
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| 140 | /* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */
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| 141 | #ifndef TCP_KEEPIDLE_DEFAULT
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| 142 | #define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */
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| 143 | #endif
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| 144 |
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| 145 | #ifndef TCP_KEEPINTVL_DEFAULT
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| 146 | #define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */
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| 147 | #endif
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| 148 |
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| 149 | #ifndef TCP_KEEPCNT_DEFAULT
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| 150 | #define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */
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| 151 | #endif
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| 152 |
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| 153 | #define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */
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| 154 |
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| 155 | #define TCP_TCPLEN(seg) ((seg)->len + (((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0) ? 1U : 0U))
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| 156 |
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| 157 | /** Flags used on input processing, not on pcb->flags
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| 158 | */
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| 159 | #define TF_RESET (u8_t)0x08U /* Connection was reset. */
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| 160 | #define TF_CLOSED (u8_t)0x10U /* Connection was successfully closed. */
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| 161 | #define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */
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| 162 |
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| 163 |
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| 164 | #if LWIP_EVENT_API
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| 165 |
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| 166 | #define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) ret = lwip_tcp_event(arg, (pcb),\
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| 167 | LWIP_EVENT_ACCEPT, NULL, 0, err)
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| 168 | #define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
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| 169 | LWIP_EVENT_SENT, NULL, space, ERR_OK)
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| 170 | #define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
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| 171 | LWIP_EVENT_RECV, (p), 0, (err))
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| 172 | #define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
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| 173 | LWIP_EVENT_RECV, NULL, 0, ERR_OK)
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| 174 | #define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
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| 175 | LWIP_EVENT_CONNECTED, NULL, 0, (err))
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| 176 | #define TCP_EVENT_POLL(pcb,ret) do { if ((pcb)->state != SYN_RCVD) { \
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| 177 | ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_POLL, NULL, 0, ERR_OK); \
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| 178 | } else { \
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| 179 | ret = ERR_ARG; } } while(0)
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| 180 | /* For event API, last state SYN_RCVD must be excluded here: the application
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| 181 | has not seen this pcb, yet! */
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| 182 | #define TCP_EVENT_ERR(last_state,errf,arg,err) do { if (last_state != SYN_RCVD) { \
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| 183 | lwip_tcp_event((arg), NULL, LWIP_EVENT_ERR, NULL, 0, (err)); } } while(0)
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| 184 |
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| 185 | #else /* LWIP_EVENT_API */
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| 186 |
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| 187 | #define TCP_EVENT_ACCEPT(lpcb,pcb,arg,err,ret) \
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| 188 | do { \
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| 189 | if((lpcb)->accept != NULL) \
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| 190 | (ret) = (lpcb)->accept((arg),(pcb),(err)); \
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| 191 | else (ret) = ERR_ARG; \
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| 192 | } while (0)
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| 193 |
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| 194 | #define TCP_EVENT_SENT(pcb,space,ret) \
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| 195 | do { \
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| 196 | if((pcb)->sent != NULL) \
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| 197 | (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \
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| 198 | else (ret) = ERR_OK; \
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| 199 | } while (0)
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| 200 |
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| 201 | #define TCP_EVENT_RECV(pcb,p,err,ret) \
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| 202 | do { \
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| 203 | if((pcb)->recv != NULL) { \
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| 204 | (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\
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| 205 | } else { \
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| 206 | (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \
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| 207 | } \
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| 208 | } while (0)
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| 209 |
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| 210 | #define TCP_EVENT_CLOSED(pcb,ret) \
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| 211 | do { \
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| 212 | if(((pcb)->recv != NULL)) { \
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| 213 | (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\
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| 214 | } else { \
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| 215 | (ret) = ERR_OK; \
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| 216 | } \
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| 217 | } while (0)
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| 218 |
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| 219 | #define TCP_EVENT_CONNECTED(pcb,err,ret) \
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| 220 | do { \
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| 221 | if((pcb)->connected != NULL) \
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| 222 | (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \
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| 223 | else (ret) = ERR_OK; \
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| 224 | } while (0)
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| 225 |
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| 226 | #define TCP_EVENT_POLL(pcb,ret) \
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| 227 | do { \
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| 228 | if((pcb)->poll != NULL) \
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| 229 | (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \
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| 230 | else (ret) = ERR_OK; \
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| 231 | } while (0)
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| 232 |
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| 233 | #define TCP_EVENT_ERR(last_state,errf,arg,err) \
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| 234 | do { \
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| 235 | LWIP_UNUSED_ARG(last_state); \
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| 236 | if((errf) != NULL) \
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| 237 | (errf)((arg),(err)); \
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| 238 | } while (0)
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| 239 |
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| 240 | #endif /* LWIP_EVENT_API */
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| 241 |
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| 242 | /** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */
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| 243 | #if TCP_OVERSIZE && defined(LWIP_DEBUG)
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| 244 | #define TCP_OVERSIZE_DBGCHECK 1
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| 245 | #else
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| 246 | #define TCP_OVERSIZE_DBGCHECK 0
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| 247 | #endif
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| 248 |
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| 249 | /** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */
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| 250 | #define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP)
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| 251 |
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| 252 | /* This structure represents a TCP segment on the unsent, unacked and ooseq queues */
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| 253 | struct tcp_seg {
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| 254 | struct tcp_seg *next; /* used when putting segments on a queue */
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| 255 | struct pbuf *p; /* buffer containing data + TCP header */
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| 256 | u16_t len; /* the TCP length of this segment */
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| 257 | #if TCP_OVERSIZE_DBGCHECK
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| 258 | u16_t oversize_left; /* Extra bytes available at the end of the last
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| 259 | pbuf in unsent (used for asserting vs.
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| 260 | tcp_pcb.unsent_oversize only) */
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| 261 | #endif /* TCP_OVERSIZE_DBGCHECK */
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| 262 | #if TCP_CHECKSUM_ON_COPY
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| 263 | u16_t chksum;
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| 264 | u8_t chksum_swapped;
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| 265 | #endif /* TCP_CHECKSUM_ON_COPY */
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| 266 | u8_t flags;
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| 267 | #define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option (only used in SYN segments) */
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| 268 | #define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */
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| 269 | #define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is
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| 270 | checksummed into 'chksum' */
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| 271 | #define TF_SEG_OPTS_WND_SCALE (u8_t)0x08U /* Include WND SCALE option (only used in SYN segments) */
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| 272 | #define TF_SEG_OPTS_SACK_PERM (u8_t)0x10U /* Include SACK Permitted option (only used in SYN segments) */
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| 273 | struct tcp_hdr *tcphdr; /* the TCP header */
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| 274 | };
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| 275 |
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| 276 | #define LWIP_TCP_OPT_EOL 0
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| 277 | #define LWIP_TCP_OPT_NOP 1
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| 278 | #define LWIP_TCP_OPT_MSS 2
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| 279 | #define LWIP_TCP_OPT_WS 3
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| 280 | #define LWIP_TCP_OPT_SACK_PERM 4
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| 281 | #define LWIP_TCP_OPT_TS 8
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| 282 |
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| 283 | #define LWIP_TCP_OPT_LEN_MSS 4
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| 284 | #if LWIP_TCP_TIMESTAMPS
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| 285 | #define LWIP_TCP_OPT_LEN_TS 10
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| 286 | #define LWIP_TCP_OPT_LEN_TS_OUT 12 /* aligned for output (includes NOP padding) */
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| 287 | #else
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| 288 | #define LWIP_TCP_OPT_LEN_TS_OUT 0
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| 289 | #endif
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| 290 | #if LWIP_WND_SCALE
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| 291 | #define LWIP_TCP_OPT_LEN_WS 3
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| 292 | #define LWIP_TCP_OPT_LEN_WS_OUT 4 /* aligned for output (includes NOP padding) */
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| 293 | #else
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| 294 | #define LWIP_TCP_OPT_LEN_WS_OUT 0
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| 295 | #endif
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| 296 |
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| 297 | #if LWIP_TCP_SACK_OUT
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| 298 | #define LWIP_TCP_OPT_LEN_SACK_PERM 2
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| 299 | #define LWIP_TCP_OPT_LEN_SACK_PERM_OUT 4 /* aligned for output (includes NOP padding) */
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| 300 | #else
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| 301 | #define LWIP_TCP_OPT_LEN_SACK_PERM_OUT 0
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| 302 | #endif
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| 303 |
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| 304 | #define LWIP_TCP_OPT_LENGTH(flags) \
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| 305 | ((flags) & TF_SEG_OPTS_MSS ? LWIP_TCP_OPT_LEN_MSS : 0) + \
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| 306 | ((flags) & TF_SEG_OPTS_TS ? LWIP_TCP_OPT_LEN_TS_OUT : 0) + \
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| 307 | ((flags) & TF_SEG_OPTS_WND_SCALE ? LWIP_TCP_OPT_LEN_WS_OUT : 0) + \
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| 308 | ((flags) & TF_SEG_OPTS_SACK_PERM ? LWIP_TCP_OPT_LEN_SACK_PERM_OUT : 0)
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| 309 |
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| 310 | /** This returns a TCP header option for MSS in an u32_t */
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| 311 | #define TCP_BUILD_MSS_OPTION(mss) lwip_htonl(0x02040000 | ((mss) & 0xFFFF))
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| 312 |
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| 313 | #if LWIP_WND_SCALE
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| 314 | #define TCPWNDSIZE_F U32_F
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| 315 | #define TCPWND_MAX 0xFFFFFFFFU
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| 316 | #define TCPWND_CHECK16(x) LWIP_ASSERT("window size > 0xFFFF", (x) <= 0xFFFF)
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| 317 | #define TCPWND_MIN16(x) ((u16_t)LWIP_MIN((x), 0xFFFF))
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| 318 | #else /* LWIP_WND_SCALE */
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| 319 | #define TCPWNDSIZE_F U16_F
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| 320 | #define TCPWND_MAX 0xFFFFU
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| 321 | #define TCPWND_CHECK16(x)
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| 322 | #define TCPWND_MIN16(x) x
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| 323 | #endif /* LWIP_WND_SCALE */
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| 324 |
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| 325 | /* Global variables: */
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| 326 | extern struct tcp_pcb *tcp_input_pcb;
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| 327 | extern u32_t tcp_ticks;
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| 328 | extern u8_t tcp_active_pcbs_changed;
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| 329 |
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| 330 | /* The TCP PCB lists. */
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| 331 | union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */
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| 332 | struct tcp_pcb_listen *listen_pcbs;
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| 333 | struct tcp_pcb *pcbs;
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| 334 | };
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| 335 | extern struct tcp_pcb *tcp_bound_pcbs;
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| 336 | extern union tcp_listen_pcbs_t tcp_listen_pcbs;
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| 337 | extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a
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| 338 | state in which they accept or send
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| 339 | data. */
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| 340 | extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */
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| 341 |
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| 342 | #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
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| 343 | #define NUM_TCP_PCB_LISTS 4
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| 344 | extern struct tcp_pcb ** const tcp_pcb_lists[NUM_TCP_PCB_LISTS];
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| 345 |
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| 346 | /* Axioms about the above lists:
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| 347 | 1) Every TCP PCB that is not CLOSED is in one of the lists.
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| 348 | 2) A PCB is only in one of the lists.
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| 349 | 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
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| 350 | 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
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| 351 | */
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| 352 | /* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
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| 353 | with a PCB list or removes a PCB from a list, respectively. */
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| 354 | #ifndef TCP_DEBUG_PCB_LISTS
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| 355 | #define TCP_DEBUG_PCB_LISTS 0
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| 356 | #endif
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| 357 | #if TCP_DEBUG_PCB_LISTS
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| 358 | #define TCP_REG(pcbs, npcb) do {\
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| 359 | struct tcp_pcb *tcp_tmp_pcb; \
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| 360 | LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %"U16_F"\n", (void *)(npcb), (npcb)->local_port)); \
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| 361 | for (tcp_tmp_pcb = *(pcbs); \
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| 362 | tcp_tmp_pcb != NULL; \
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| 363 | tcp_tmp_pcb = tcp_tmp_pcb->next) { \
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| 364 | LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \
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| 365 | } \
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| 366 | LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \
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| 367 | (npcb)->next = *(pcbs); \
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| 368 | LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \
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| 369 | *(pcbs) = (npcb); \
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| 370 | LWIP_ASSERT("TCP_REG: tcp_pcbs sane", tcp_pcbs_sane()); \
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| 371 | tcp_timer_needed(); \
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| 372 | } while(0)
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| 373 | #define TCP_RMV(pcbs, npcb) do { \
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| 374 | struct tcp_pcb *tcp_tmp_pcb; \
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| 375 | LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \
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| 376 | LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (void *)(npcb), (void *)(*(pcbs)))); \
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| 377 | if(*(pcbs) == (npcb)) { \
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| 378 | *(pcbs) = (*pcbs)->next; \
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| 379 | } else for (tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
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| 380 | if(tcp_tmp_pcb->next == (npcb)) { \
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| 381 | tcp_tmp_pcb->next = (npcb)->next; \
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| 382 | break; \
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| 383 | } \
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| 384 | } \
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| 385 | (npcb)->next = NULL; \
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| 386 | LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
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| 387 | LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (void *)(npcb), (void *)(*(pcbs)))); \
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| 388 | } while(0)
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| 389 |
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| 390 | #else /* LWIP_DEBUG */
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| 391 |
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| 392 | #define TCP_REG(pcbs, npcb) \
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| 393 | do { \
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| 394 | (npcb)->next = *pcbs; \
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| 395 | *(pcbs) = (npcb); \
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| 396 | tcp_timer_needed(); \
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| 397 | } while (0)
|
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| 398 |
|
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| 399 | #define TCP_RMV(pcbs, npcb) \
|
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| 400 | do { \
|
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| 401 | if(*(pcbs) == (npcb)) { \
|
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| 402 | (*(pcbs)) = (*pcbs)->next; \
|
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| 403 | } \
|
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| 404 | else { \
|
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| 405 | struct tcp_pcb *tcp_tmp_pcb; \
|
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| 406 | for (tcp_tmp_pcb = *pcbs; \
|
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| 407 | tcp_tmp_pcb != NULL; \
|
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| 408 | tcp_tmp_pcb = tcp_tmp_pcb->next) { \
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| 409 | if(tcp_tmp_pcb->next == (npcb)) { \
|
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| 410 | tcp_tmp_pcb->next = (npcb)->next; \
|
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| 411 | break; \
|
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| 412 | } \
|
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| 413 | } \
|
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| 414 | } \
|
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| 415 | (npcb)->next = NULL; \
|
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| 416 | } while(0)
|
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| 417 |
|
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| 418 | #endif /* LWIP_DEBUG */
|
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| 419 |
|
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| 420 | #define TCP_REG_ACTIVE(npcb) \
|
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| 421 | do { \
|
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| 422 | TCP_REG(&tcp_active_pcbs, npcb); \
|
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| 423 | tcp_active_pcbs_changed = 1; \
|
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| 424 | } while (0)
|
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| 425 |
|
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| 426 | #define TCP_RMV_ACTIVE(npcb) \
|
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| 427 | do { \
|
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| 428 | TCP_RMV(&tcp_active_pcbs, npcb); \
|
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| 429 | tcp_active_pcbs_changed = 1; \
|
---|
| 430 | } while (0)
|
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| 431 |
|
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| 432 | #define TCP_PCB_REMOVE_ACTIVE(pcb) \
|
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| 433 | do { \
|
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| 434 | tcp_pcb_remove(&tcp_active_pcbs, pcb); \
|
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| 435 | tcp_active_pcbs_changed = 1; \
|
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| 436 | } while (0)
|
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| 437 |
|
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| 438 |
|
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| 439 | /* Internal functions: */
|
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| 440 | struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb);
|
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| 441 | void tcp_pcb_purge(struct tcp_pcb *pcb);
|
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| 442 | void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb);
|
---|
| 443 |
|
---|
| 444 | void tcp_segs_free(struct tcp_seg *seg);
|
---|
| 445 | void tcp_seg_free(struct tcp_seg *seg);
|
---|
| 446 | struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg);
|
---|
| 447 |
|
---|
| 448 | #define tcp_ack(pcb) \
|
---|
| 449 | do { \
|
---|
| 450 | if((pcb)->flags & TF_ACK_DELAY) { \
|
---|
| 451 | tcp_clear_flags(pcb, TF_ACK_DELAY); \
|
---|
| 452 | tcp_ack_now(pcb); \
|
---|
| 453 | } \
|
---|
| 454 | else { \
|
---|
| 455 | tcp_set_flags(pcb, TF_ACK_DELAY); \
|
---|
| 456 | } \
|
---|
| 457 | } while (0)
|
---|
| 458 |
|
---|
| 459 | #define tcp_ack_now(pcb) \
|
---|
| 460 | tcp_set_flags(pcb, TF_ACK_NOW)
|
---|
| 461 |
|
---|
| 462 | err_t tcp_send_fin(struct tcp_pcb *pcb);
|
---|
| 463 | err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags);
|
---|
| 464 |
|
---|
| 465 | void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg);
|
---|
| 466 |
|
---|
| 467 | void tcp_rst(const struct tcp_pcb* pcb, u32_t seqno, u32_t ackno,
|
---|
| 468 | const ip_addr_t *local_ip, const ip_addr_t *remote_ip,
|
---|
| 469 | u16_t local_port, u16_t remote_port);
|
---|
| 470 |
|
---|
| 471 | u32_t tcp_next_iss(struct tcp_pcb *pcb);
|
---|
| 472 |
|
---|
| 473 | err_t tcp_keepalive(struct tcp_pcb *pcb);
|
---|
| 474 | err_t tcp_split_unsent_seg(struct tcp_pcb *pcb, u16_t split);
|
---|
| 475 | err_t tcp_zero_window_probe(struct tcp_pcb *pcb);
|
---|
| 476 | void tcp_trigger_input_pcb_close(void);
|
---|
| 477 |
|
---|
| 478 | #if TCP_CALCULATE_EFF_SEND_MSS
|
---|
| 479 | u16_t tcp_eff_send_mss_netif(u16_t sendmss, struct netif *outif,
|
---|
| 480 | const ip_addr_t *dest);
|
---|
| 481 | #define tcp_eff_send_mss(sendmss, src, dest) \
|
---|
| 482 | tcp_eff_send_mss_netif(sendmss, ip_route(src, dest), dest)
|
---|
| 483 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */
|
---|
| 484 |
|
---|
| 485 | #if LWIP_CALLBACK_API
|
---|
| 486 | err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
|
---|
| 487 | #endif /* LWIP_CALLBACK_API */
|
---|
| 488 |
|
---|
| 489 | #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
|
---|
| 490 | void tcp_debug_print(struct tcp_hdr *tcphdr);
|
---|
| 491 | void tcp_debug_print_flags(u8_t flags);
|
---|
| 492 | void tcp_debug_print_state(enum tcp_state s);
|
---|
| 493 | void tcp_debug_print_pcbs(void);
|
---|
| 494 | s16_t tcp_pcbs_sane(void);
|
---|
| 495 | #else
|
---|
| 496 | # define tcp_debug_print(tcphdr)
|
---|
| 497 | # define tcp_debug_print_flags(flags)
|
---|
| 498 | # define tcp_debug_print_state(s)
|
---|
| 499 | # define tcp_debug_print_pcbs()
|
---|
| 500 | # define tcp_pcbs_sane() 1
|
---|
| 501 | #endif /* TCP_DEBUG */
|
---|
| 502 |
|
---|
| 503 | /** External function (implemented in timers.c), called when TCP detects
|
---|
| 504 | * that a timer is needed (i.e. active- or time-wait-pcb found). */
|
---|
| 505 | void tcp_timer_needed(void);
|
---|
| 506 |
|
---|
| 507 | void tcp_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_addr);
|
---|
| 508 |
|
---|
| 509 | #if TCP_QUEUE_OOSEQ
|
---|
| 510 | void tcp_free_ooseq(struct tcp_pcb *pcb);
|
---|
| 511 | #endif
|
---|
| 512 |
|
---|
| 513 | #if LWIP_TCP_PCB_NUM_EXT_ARGS
|
---|
| 514 | err_t tcp_ext_arg_invoke_callbacks_passive_open(struct tcp_pcb_listen *lpcb, struct tcp_pcb *cpcb);
|
---|
| 515 | #endif
|
---|
| 516 |
|
---|
| 517 | #ifdef __cplusplus
|
---|
| 518 | }
|
---|
| 519 | #endif
|
---|
| 520 |
|
---|
| 521 | #endif /* LWIP_TCP */
|
---|
| 522 |
|
---|
| 523 | #endif /* LWIP_HDR_TCP_PRIV_H */
|
---|