[164] | 1 | /**
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| 2 | * @file
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| 3 | * Transmission Control Protocol for IP
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| 4 | *
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| 5 | * This file contains common functions for the TCP implementation, such as functinos
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| 6 | * for manipulating the data structures and the TCP timer functions. TCP functions
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| 7 | * related to input and output is found in tcp_in.c and tcp_out.c respectively.
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| 8 | *
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| 9 | */
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| 10 |
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| 11 | /*
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| 12 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 13 | * All rights reserved.
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| 14 | *
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| 15 | * Redistribution and use in source and binary forms, with or without modification,
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| 16 | * are permitted provided that the following conditions are met:
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| 17 | *
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| 18 | * 1. Redistributions of source code must retain the above copyright notice,
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| 19 | * this list of conditions and the following disclaimer.
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| 20 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 21 | * this list of conditions and the following disclaimer in the documentation
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| 22 | * and/or other materials provided with the distribution.
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| 23 | * 3. The name of the author may not be used to endorse or promote products
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| 24 | * derived from this software without specific prior written permission.
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| 25 | *
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| 26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 27 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 28 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 29 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 30 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 31 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 34 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 35 | * OF SUCH DAMAGE.
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| 36 | *
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| 37 | * This file is part of the lwIP TCP/IP stack.
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| 38 | *
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| 39 | * Author: Adam Dunkels <adam@sics.se>
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| 40 | *
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| 41 | */
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| 42 |
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| 43 | #include "lwip/opt.h"
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| 44 |
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| 45 | #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
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| 46 |
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| 47 | #include "lwip/def.h"
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| 48 | #include "lwip/mem.h"
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| 49 | #include "lwip/memp.h"
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| 50 | #include "lwip/snmp.h"
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| 51 | #include "lwip/tcp.h"
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| 52 | #include "lwip/tcp_impl.h"
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| 53 | #include "lwip/debug.h"
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| 54 | #include "lwip/stats.h"
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| 55 |
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| 56 | #include <string.h>
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| 57 |
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| 58 | #ifndef TCP_LOCAL_PORT_RANGE_START
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| 59 | /* From http://www.iana.org/assignments/port-numbers:
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| 60 | "The Dynamic and/or Private Ports are those from 49152 through 65535" */
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| 61 | #define TCP_LOCAL_PORT_RANGE_START 0xc000
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| 62 | #define TCP_LOCAL_PORT_RANGE_END 0xffff
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| 63 | #define TCP_ENSURE_LOCAL_PORT_RANGE(port) (((port) & ~TCP_LOCAL_PORT_RANGE_START) + TCP_LOCAL_PORT_RANGE_START)
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| 64 | #endif
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| 65 |
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| 66 | #if LWIP_TCP_KEEPALIVE
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| 67 | #define TCP_KEEP_DUR(pcb) ((pcb)->keep_cnt * (pcb)->keep_intvl)
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| 68 | #define TCP_KEEP_INTVL(pcb) ((pcb)->keep_intvl)
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| 69 | #else /* LWIP_TCP_KEEPALIVE */
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| 70 | #define TCP_KEEP_DUR(pcb) TCP_MAXIDLE
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| 71 | #define TCP_KEEP_INTVL(pcb) TCP_KEEPINTVL_DEFAULT
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| 72 | #endif /* LWIP_TCP_KEEPALIVE */
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| 73 |
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| 74 | const char * const tcp_state_str[] = {
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| 75 | "CLOSED",
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| 76 | "LISTEN",
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| 77 | "SYN_SENT",
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| 78 | "SYN_RCVD",
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| 79 | "ESTABLISHED",
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| 80 | "FIN_WAIT_1",
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| 81 | "FIN_WAIT_2",
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| 82 | "CLOSE_WAIT",
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| 83 | "CLOSING",
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| 84 | "LAST_ACK",
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| 85 | "TIME_WAIT"
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| 86 | };
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| 87 |
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| 88 | /* last local TCP port */
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| 89 | static u16_t tcp_port = TCP_LOCAL_PORT_RANGE_START;
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| 90 |
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| 91 | /* Incremented every coarse grained timer shot (typically every 500 ms). */
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| 92 | u32_t tcp_ticks;
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| 93 | const u8_t tcp_backoff[13] =
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| 94 | { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
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| 95 | /* Times per slowtmr hits */
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| 96 | const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
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| 97 |
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| 98 | /* The TCP PCB lists. */
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| 99 |
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| 100 | /** List of all TCP PCBs bound but not yet (connected || listening) */
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| 101 | struct tcp_pcb *tcp_bound_pcbs;
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| 102 | /** List of all TCP PCBs in LISTEN state */
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| 103 | union tcp_listen_pcbs_t tcp_listen_pcbs;
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| 104 | /** List of all TCP PCBs that are in a state in which
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| 105 | * they accept or send data. */
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| 106 | struct tcp_pcb *tcp_active_pcbs;
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| 107 | /** List of all TCP PCBs in TIME-WAIT state */
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| 108 | struct tcp_pcb *tcp_tw_pcbs;
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| 109 |
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| 110 | #define NUM_TCP_PCB_LISTS 4
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| 111 | #define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
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| 112 | /** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
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| 113 | struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
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| 114 | &tcp_active_pcbs, &tcp_tw_pcbs};
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| 115 |
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| 116 | /** Only used for temporary storage. */
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| 117 | struct tcp_pcb *tcp_tmp_pcb;
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| 118 |
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| 119 | u8_t tcp_active_pcbs_changed;
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| 120 |
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| 121 | /** Timer counter to handle calling slow-timer from tcp_tmr() */
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| 122 | static u8_t tcp_timer;
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| 123 | static u8_t tcp_timer_ctr;
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| 124 | static u16_t tcp_new_port(void);
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| 125 |
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| 126 | /**
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| 127 | * Initialize this module.
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| 128 | */
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| 129 | void
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| 130 | tcp_init(void)
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| 131 | {
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| 132 | #if LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND)
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| 133 | tcp_port = TCP_ENSURE_LOCAL_PORT_RANGE(LWIP_RAND());
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| 134 | #endif /* LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND) */
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| 135 | }
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| 136 |
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| 137 | /**
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| 138 | * Called periodically to dispatch TCP timers.
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| 139 | */
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| 140 | void
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| 141 | tcp_tmr(void)
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| 142 | {
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| 143 | /* Call tcp_fasttmr() every 250 ms */
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| 144 | tcp_fasttmr();
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| 145 |
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| 146 | if (++tcp_timer & 1) {
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| 147 | /* Call tcp_tmr() every 500 ms, i.e., every other timer
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| 148 | tcp_tmr() is called. */
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| 149 | tcp_slowtmr();
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| 150 | }
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| 151 | }
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| 152 |
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| 153 | /**
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| 154 | * Closes the TX side of a connection held by the PCB.
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| 155 | * For tcp_close(), a RST is sent if the application didn't receive all data
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| 156 | * (tcp_recved() not called for all data passed to recv callback).
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| 157 | *
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| 158 | * Listening pcbs are freed and may not be referenced any more.
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| 159 | * Connection pcbs are freed if not yet connected and may not be referenced
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| 160 | * any more. If a connection is established (at least SYN received or in
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| 161 | * a closing state), the connection is closed, and put in a closing state.
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| 162 | * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
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| 163 | * unsafe to reference it.
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| 164 | *
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| 165 | * @param pcb the tcp_pcb to close
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| 166 | * @return ERR_OK if connection has been closed
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| 167 | * another err_t if closing failed and pcb is not freed
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| 168 | */
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| 169 | static err_t
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| 170 | tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
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| 171 | {
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| 172 | err_t err;
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| 173 |
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| 174 | if (rst_on_unacked_data && ((pcb->state == ESTABLISHED) || (pcb->state == CLOSE_WAIT))) {
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| 175 | if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
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| 176 | /* Not all data received by application, send RST to tell the remote
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| 177 | side about this. */
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| 178 | LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
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| 179 |
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| 180 | /* don't call tcp_abort here: we must not deallocate the pcb since
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| 181 | that might not be expected when calling tcp_close */
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| 182 | tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
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| 183 | pcb->local_port, pcb->remote_port);
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| 184 |
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| 185 | tcp_pcb_purge(pcb);
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| 186 | TCP_RMV_ACTIVE(pcb);
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| 187 | if (pcb->state == ESTABLISHED) {
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| 188 | /* move to TIME_WAIT since we close actively */
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| 189 | pcb->state = TIME_WAIT;
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| 190 | TCP_REG(&tcp_tw_pcbs, pcb);
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| 191 | } else {
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| 192 | /* CLOSE_WAIT: deallocate the pcb since we already sent a RST for it */
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| 193 | memp_free(MEMP_TCP_PCB, pcb);
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| 194 | }
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| 195 | return ERR_OK;
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| 196 | }
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| 197 | }
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| 198 |
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| 199 | switch (pcb->state) {
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| 200 | case CLOSED:
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| 201 | /* Closing a pcb in the CLOSED state might seem erroneous,
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| 202 | * however, it is in this state once allocated and as yet unused
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| 203 | * and the user needs some way to free it should the need arise.
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| 204 | * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
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| 205 | * or for a pcb that has been used and then entered the CLOSED state
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| 206 | * is erroneous, but this should never happen as the pcb has in those cases
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| 207 | * been freed, and so any remaining handles are bogus. */
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| 208 | err = ERR_OK;
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| 209 | if (pcb->local_port != 0) {
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| 210 | TCP_RMV(&tcp_bound_pcbs, pcb);
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| 211 | }
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| 212 | memp_free(MEMP_TCP_PCB, pcb);
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| 213 | pcb = NULL;
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| 214 | break;
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| 215 | case LISTEN:
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| 216 | err = ERR_OK;
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| 217 | tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
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| 218 | memp_free(MEMP_TCP_PCB_LISTEN, pcb);
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| 219 | pcb = NULL;
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| 220 | break;
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| 221 | case SYN_SENT:
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| 222 | err = ERR_OK;
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| 223 | TCP_PCB_REMOVE_ACTIVE(pcb);
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| 224 | memp_free(MEMP_TCP_PCB, pcb);
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| 225 | pcb = NULL;
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| 226 | snmp_inc_tcpattemptfails();
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| 227 | break;
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| 228 | case SYN_RCVD:
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| 229 | err = tcp_send_fin(pcb);
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| 230 | if (err == ERR_OK) {
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| 231 | snmp_inc_tcpattemptfails();
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| 232 | pcb->state = FIN_WAIT_1;
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| 233 | }
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| 234 | break;
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| 235 | case ESTABLISHED:
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| 236 | err = tcp_send_fin(pcb);
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| 237 | if (err == ERR_OK) {
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| 238 | snmp_inc_tcpestabresets();
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| 239 | pcb->state = FIN_WAIT_1;
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| 240 | }
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| 241 | break;
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| 242 | case CLOSE_WAIT:
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| 243 | err = tcp_send_fin(pcb);
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| 244 | if (err == ERR_OK) {
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| 245 | snmp_inc_tcpestabresets();
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| 246 | pcb->state = LAST_ACK;
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| 247 | }
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| 248 | break;
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| 249 | default:
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| 250 | /* Has already been closed, do nothing. */
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| 251 | err = ERR_OK;
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| 252 | pcb = NULL;
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| 253 | break;
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| 254 | }
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| 255 |
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| 256 | if (pcb != NULL && err == ERR_OK) {
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| 257 | /* To ensure all data has been sent when tcp_close returns, we have
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| 258 | to make sure tcp_output doesn't fail.
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| 259 | Since we don't really have to ensure all data has been sent when tcp_close
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| 260 | returns (unsent data is sent from tcp timer functions, also), we don't care
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| 261 | for the return value of tcp_output for now. */
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| 262 | /* @todo: When implementing SO_LINGER, this must be changed somehow:
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| 263 | If SOF_LINGER is set, the data should be sent and acked before close returns.
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| 264 | This can only be valid for sequential APIs, not for the raw API. */
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| 265 | tcp_output(pcb);
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| 266 | }
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| 267 | return err;
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| 268 | }
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| 269 |
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| 270 | /**
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| 271 | * Closes the connection held by the PCB.
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| 272 | *
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| 273 | * Listening pcbs are freed and may not be referenced any more.
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| 274 | * Connection pcbs are freed if not yet connected and may not be referenced
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| 275 | * any more. If a connection is established (at least SYN received or in
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| 276 | * a closing state), the connection is closed, and put in a closing state.
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| 277 | * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
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| 278 | * unsafe to reference it (unless an error is returned).
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| 279 | *
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| 280 | * @param pcb the tcp_pcb to close
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| 281 | * @return ERR_OK if connection has been closed
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| 282 | * another err_t if closing failed and pcb is not freed
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| 283 | */
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| 284 | err_t
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| 285 | tcp_close(struct tcp_pcb *pcb)
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| 286 | {
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| 287 | #if TCP_DEBUG
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| 288 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
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| 289 | tcp_debug_print_state(pcb->state);
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| 290 | #endif /* TCP_DEBUG */
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| 291 |
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| 292 | if (pcb->state != LISTEN) {
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| 293 | /* Set a flag not to receive any more data... */
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| 294 | pcb->flags |= TF_RXCLOSED;
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| 295 | }
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| 296 | /* ... and close */
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| 297 | return tcp_close_shutdown(pcb, 1);
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| 298 | }
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| 299 |
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| 300 | /**
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| 301 | * Causes all or part of a full-duplex connection of this PCB to be shut down.
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| 302 | * This doesn't deallocate the PCB unless shutting down both sides!
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| 303 | * Shutting down both sides is the same as calling tcp_close, so if it succeds,
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| 304 | * the PCB should not be referenced any more.
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| 305 | *
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| 306 | * @param pcb PCB to shutdown
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| 307 | * @param shut_rx shut down receive side if this is != 0
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| 308 | * @param shut_tx shut down send side if this is != 0
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| 309 | * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
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| 310 | * another err_t on error.
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| 311 | */
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| 312 | err_t
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| 313 | tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
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| 314 | {
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| 315 | if (pcb->state == LISTEN) {
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| 316 | return ERR_CONN;
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| 317 | }
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| 318 | if (shut_rx) {
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| 319 | /* shut down the receive side: set a flag not to receive any more data... */
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| 320 | pcb->flags |= TF_RXCLOSED;
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| 321 | if (shut_tx) {
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| 322 | /* shutting down the tx AND rx side is the same as closing for the raw API */
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| 323 | return tcp_close_shutdown(pcb, 1);
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| 324 | }
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| 325 | /* ... and free buffered data */
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| 326 | if (pcb->refused_data != NULL) {
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| 327 | pbuf_free(pcb->refused_data);
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| 328 | pcb->refused_data = NULL;
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| 329 | }
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| 330 | }
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| 331 | if (shut_tx) {
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| 332 | /* This can't happen twice since if it succeeds, the pcb's state is changed.
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| 333 | Only close in these states as the others directly deallocate the PCB */
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| 334 | switch (pcb->state) {
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| 335 | case SYN_RCVD:
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| 336 | case ESTABLISHED:
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| 337 | case CLOSE_WAIT:
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| 338 | return tcp_close_shutdown(pcb, shut_rx);
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| 339 | default:
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| 340 | /* Not (yet?) connected, cannot shutdown the TX side as that would bring us
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| 341 | into CLOSED state, where the PCB is deallocated. */
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| 342 | return ERR_CONN;
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| 343 | }
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| 344 | }
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| 345 | return ERR_OK;
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| 346 | }
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| 347 |
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| 348 | /**
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| 349 | * Abandons a connection and optionally sends a RST to the remote
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| 350 | * host. Deletes the local protocol control block. This is done when
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| 351 | * a connection is killed because of shortage of memory.
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| 352 | *
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| 353 | * @param pcb the tcp_pcb to abort
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| 354 | * @param reset boolean to indicate whether a reset should be sent
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| 355 | */
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| 356 | void
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| 357 | tcp_abandon(struct tcp_pcb *pcb, int reset)
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| 358 | {
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| 359 | u32_t seqno, ackno;
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| 360 | #if LWIP_CALLBACK_API
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| 361 | tcp_err_fn errf;
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| 362 | #endif /* LWIP_CALLBACK_API */
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| 363 | void *errf_arg;
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| 364 |
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| 365 | /* pcb->state LISTEN not allowed here */
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| 366 | LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
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| 367 | pcb->state != LISTEN);
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| 368 | /* Figure out on which TCP PCB list we are, and remove us. If we
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| 369 | are in an active state, call the receive function associated with
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| 370 | the PCB with a NULL argument, and send an RST to the remote end. */
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| 371 | if (pcb->state == TIME_WAIT) {
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| 372 | tcp_pcb_remove(&tcp_tw_pcbs, pcb);
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| 373 | memp_free(MEMP_TCP_PCB, pcb);
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| 374 | } else {
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| 375 | seqno = pcb->snd_nxt;
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| 376 | ackno = pcb->rcv_nxt;
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| 377 | #if LWIP_CALLBACK_API
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| 378 | errf = pcb->errf;
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| 379 | #endif /* LWIP_CALLBACK_API */
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| 380 | errf_arg = pcb->callback_arg;
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| 381 | TCP_PCB_REMOVE_ACTIVE(pcb);
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| 382 | if (pcb->unacked != NULL) {
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| 383 | tcp_segs_free(pcb->unacked);
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| 384 | }
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| 385 | if (pcb->unsent != NULL) {
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| 386 | tcp_segs_free(pcb->unsent);
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| 387 | }
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| 388 | #if TCP_QUEUE_OOSEQ
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| 389 | if (pcb->ooseq != NULL) {
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| 390 | tcp_segs_free(pcb->ooseq);
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| 391 | }
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| 392 | #endif /* TCP_QUEUE_OOSEQ */
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| 393 | if (reset) {
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| 394 | LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
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| 395 | tcp_rst(seqno, ackno, &pcb->local_ip, &pcb->remote_ip, pcb->local_port, pcb->remote_port);
|
---|
| 396 | }
|
---|
| 397 | memp_free(MEMP_TCP_PCB, pcb);
|
---|
| 398 | TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
|
---|
| 399 | }
|
---|
| 400 | }
|
---|
| 401 |
|
---|
| 402 | /**
|
---|
| 403 | * Aborts the connection by sending a RST (reset) segment to the remote
|
---|
| 404 | * host. The pcb is deallocated. This function never fails.
|
---|
| 405 | *
|
---|
| 406 | * ATTENTION: When calling this from one of the TCP callbacks, make
|
---|
| 407 | * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
|
---|
| 408 | * or you will risk accessing deallocated memory or memory leaks!
|
---|
| 409 | *
|
---|
| 410 | * @param pcb the tcp pcb to abort
|
---|
| 411 | */
|
---|
| 412 | void
|
---|
| 413 | tcp_abort(struct tcp_pcb *pcb)
|
---|
| 414 | {
|
---|
| 415 | tcp_abandon(pcb, 1);
|
---|
| 416 | }
|
---|
| 417 |
|
---|
| 418 | /**
|
---|
| 419 | * Binds the connection to a local portnumber and IP address. If the
|
---|
| 420 | * IP address is not given (i.e., ipaddr == NULL), the IP address of
|
---|
| 421 | * the outgoing network interface is used instead.
|
---|
| 422 | *
|
---|
| 423 | * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
|
---|
| 424 | * already bound!)
|
---|
| 425 | * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
|
---|
| 426 | * to any local address
|
---|
| 427 | * @param port the local port to bind to
|
---|
| 428 | * @return ERR_USE if the port is already in use
|
---|
| 429 | * ERR_VAL if bind failed because the PCB is not in a valid state
|
---|
| 430 | * ERR_OK if bound
|
---|
| 431 | */
|
---|
| 432 | err_t
|
---|
| 433 | tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
|
---|
| 434 | {
|
---|
| 435 | int i;
|
---|
| 436 | int max_pcb_list = NUM_TCP_PCB_LISTS;
|
---|
| 437 | struct tcp_pcb *cpcb;
|
---|
| 438 |
|
---|
| 439 | LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
|
---|
| 440 |
|
---|
| 441 | #if SO_REUSE
|
---|
| 442 | /* Unless the REUSEADDR flag is set,
|
---|
| 443 | we have to check the pcbs in TIME-WAIT state, also.
|
---|
| 444 | We do not dump TIME_WAIT pcb's; they can still be matched by incoming
|
---|
| 445 | packets using both local and remote IP addresses and ports to distinguish.
|
---|
| 446 | */
|
---|
| 447 | if (ip_get_option(pcb, SOF_REUSEADDR)) {
|
---|
| 448 | max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
|
---|
| 449 | }
|
---|
| 450 | #endif /* SO_REUSE */
|
---|
| 451 |
|
---|
| 452 | if (port == 0) {
|
---|
| 453 | port = tcp_new_port();
|
---|
| 454 | if (port == 0) {
|
---|
| 455 | return ERR_BUF;
|
---|
| 456 | }
|
---|
| 457 | }
|
---|
| 458 |
|
---|
| 459 | /* Check if the address already is in use (on all lists) */
|
---|
| 460 | for (i = 0; i < max_pcb_list; i++) {
|
---|
| 461 | for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
|
---|
| 462 | if (cpcb->local_port == port) {
|
---|
| 463 | #if SO_REUSE
|
---|
| 464 | /* Omit checking for the same port if both pcbs have REUSEADDR set.
|
---|
| 465 | For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
|
---|
| 466 | tcp_connect. */
|
---|
| 467 | if (!ip_get_option(pcb, SOF_REUSEADDR) ||
|
---|
| 468 | !ip_get_option(cpcb, SOF_REUSEADDR))
|
---|
| 469 | #endif /* SO_REUSE */
|
---|
| 470 | {
|
---|
| 471 | if (ip_addr_isany(&(cpcb->local_ip)) ||
|
---|
| 472 | ip_addr_isany(ipaddr) ||
|
---|
| 473 | ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
|
---|
| 474 | return ERR_USE;
|
---|
| 475 | }
|
---|
| 476 | }
|
---|
| 477 | }
|
---|
| 478 | }
|
---|
| 479 | }
|
---|
| 480 |
|
---|
| 481 | if (!ip_addr_isany(ipaddr)) {
|
---|
| 482 | pcb->local_ip = *ipaddr;
|
---|
| 483 | }
|
---|
| 484 | pcb->local_port = port;
|
---|
| 485 | TCP_REG(&tcp_bound_pcbs, pcb);
|
---|
| 486 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
|
---|
| 487 | return ERR_OK;
|
---|
| 488 | }
|
---|
| 489 | #if LWIP_CALLBACK_API
|
---|
| 490 | /**
|
---|
| 491 | * Default accept callback if no accept callback is specified by the user.
|
---|
| 492 | */
|
---|
| 493 | static err_t
|
---|
| 494 | tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
|
---|
| 495 | {
|
---|
| 496 | LWIP_UNUSED_ARG(arg);
|
---|
| 497 | LWIP_UNUSED_ARG(pcb);
|
---|
| 498 | LWIP_UNUSED_ARG(err);
|
---|
| 499 |
|
---|
| 500 | return ERR_ABRT;
|
---|
| 501 | }
|
---|
| 502 | #endif /* LWIP_CALLBACK_API */
|
---|
| 503 |
|
---|
| 504 | /**
|
---|
| 505 | * Set the state of the connection to be LISTEN, which means that it
|
---|
| 506 | * is able to accept incoming connections. The protocol control block
|
---|
| 507 | * is reallocated in order to consume less memory. Setting the
|
---|
| 508 | * connection to LISTEN is an irreversible process.
|
---|
| 509 | *
|
---|
| 510 | * @param pcb the original tcp_pcb
|
---|
| 511 | * @param backlog the incoming connections queue limit
|
---|
| 512 | * @return tcp_pcb used for listening, consumes less memory.
|
---|
| 513 | *
|
---|
| 514 | * @note The original tcp_pcb is freed. This function therefore has to be
|
---|
| 515 | * called like this:
|
---|
| 516 | * tpcb = tcp_listen(tpcb);
|
---|
| 517 | */
|
---|
| 518 | struct tcp_pcb *
|
---|
| 519 | tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
|
---|
| 520 | {
|
---|
| 521 | struct tcp_pcb_listen *lpcb;
|
---|
| 522 |
|
---|
| 523 | LWIP_UNUSED_ARG(backlog);
|
---|
| 524 | LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
|
---|
| 525 |
|
---|
| 526 | /* already listening? */
|
---|
| 527 | if (pcb->state == LISTEN) {
|
---|
| 528 | return pcb;
|
---|
| 529 | }
|
---|
| 530 | #if SO_REUSE
|
---|
| 531 | if (ip_get_option(pcb, SOF_REUSEADDR)) {
|
---|
| 532 | /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
|
---|
| 533 | is declared (listen-/connection-pcb), we have to make sure now that
|
---|
| 534 | this port is only used once for every local IP. */
|
---|
| 535 | for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
|
---|
| 536 | if (lpcb->local_port == pcb->local_port) {
|
---|
| 537 | if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
|
---|
| 538 | /* this address/port is already used */
|
---|
| 539 | return NULL;
|
---|
| 540 | }
|
---|
| 541 | }
|
---|
| 542 | }
|
---|
| 543 | }
|
---|
| 544 | #endif /* SO_REUSE */
|
---|
| 545 | lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
|
---|
| 546 | if (lpcb == NULL) {
|
---|
| 547 | return NULL;
|
---|
| 548 | }
|
---|
| 549 | lpcb->callback_arg = pcb->callback_arg;
|
---|
| 550 | lpcb->local_port = pcb->local_port;
|
---|
| 551 | lpcb->state = LISTEN;
|
---|
| 552 | lpcb->prio = pcb->prio;
|
---|
| 553 | lpcb->so_options = pcb->so_options;
|
---|
| 554 | ip_set_option(lpcb, SOF_ACCEPTCONN);
|
---|
| 555 | lpcb->ttl = pcb->ttl;
|
---|
| 556 | lpcb->tos = pcb->tos;
|
---|
| 557 | ip_addr_copy(lpcb->local_ip, pcb->local_ip);
|
---|
| 558 | if (pcb->local_port != 0) {
|
---|
| 559 | TCP_RMV(&tcp_bound_pcbs, pcb);
|
---|
| 560 | }
|
---|
| 561 | memp_free(MEMP_TCP_PCB, pcb);
|
---|
| 562 | #if LWIP_CALLBACK_API
|
---|
| 563 | lpcb->accept = tcp_accept_null;
|
---|
| 564 | #endif /* LWIP_CALLBACK_API */
|
---|
| 565 | #if TCP_LISTEN_BACKLOG
|
---|
| 566 | lpcb->accepts_pending = 0;
|
---|
| 567 | lpcb->backlog = (backlog ? backlog : 1);
|
---|
| 568 | #endif /* TCP_LISTEN_BACKLOG */
|
---|
| 569 | TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
|
---|
| 570 | return (struct tcp_pcb *)lpcb;
|
---|
| 571 | }
|
---|
| 572 |
|
---|
| 573 | /**
|
---|
| 574 | * Update the state that tracks the available window space to advertise.
|
---|
| 575 | *
|
---|
| 576 | * Returns how much extra window would be advertised if we sent an
|
---|
| 577 | * update now.
|
---|
| 578 | */
|
---|
| 579 | u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
|
---|
| 580 | {
|
---|
| 581 | u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
|
---|
| 582 |
|
---|
| 583 | if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
|
---|
| 584 | /* we can advertise more window */
|
---|
| 585 | pcb->rcv_ann_wnd = pcb->rcv_wnd;
|
---|
| 586 | return new_right_edge - pcb->rcv_ann_right_edge;
|
---|
| 587 | } else {
|
---|
| 588 | if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
|
---|
| 589 | /* Can happen due to other end sending out of advertised window,
|
---|
| 590 | * but within actual available (but not yet advertised) window */
|
---|
| 591 | pcb->rcv_ann_wnd = 0;
|
---|
| 592 | } else {
|
---|
| 593 | /* keep the right edge of window constant */
|
---|
| 594 | u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
|
---|
| 595 | LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
|
---|
| 596 | pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
|
---|
| 597 | }
|
---|
| 598 | return 0;
|
---|
| 599 | }
|
---|
| 600 | }
|
---|
| 601 |
|
---|
| 602 | /**
|
---|
| 603 | * This function should be called by the application when it has
|
---|
| 604 | * processed the data. The purpose is to advertise a larger window
|
---|
| 605 | * when the data has been processed.
|
---|
| 606 | *
|
---|
| 607 | * @param pcb the tcp_pcb for which data is read
|
---|
| 608 | * @param len the amount of bytes that have been read by the application
|
---|
| 609 | */
|
---|
| 610 | void
|
---|
| 611 | tcp_recved(struct tcp_pcb *pcb, u16_t len)
|
---|
| 612 | {
|
---|
| 613 | int wnd_inflation;
|
---|
| 614 |
|
---|
| 615 | /* pcb->state LISTEN not allowed here */
|
---|
| 616 | LWIP_ASSERT("don't call tcp_recved for listen-pcbs",
|
---|
| 617 | pcb->state != LISTEN);
|
---|
| 618 | LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
|
---|
| 619 | len <= 0xffff - pcb->rcv_wnd );
|
---|
| 620 |
|
---|
| 621 | pcb->rcv_wnd += len;
|
---|
| 622 | if (pcb->rcv_wnd > TCP_WND) {
|
---|
| 623 | pcb->rcv_wnd = TCP_WND;
|
---|
| 624 | }
|
---|
| 625 |
|
---|
| 626 | wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
|
---|
| 627 |
|
---|
| 628 | /* If the change in the right edge of window is significant (default
|
---|
| 629 | * watermark is TCP_WND/4), then send an explicit update now.
|
---|
| 630 | * Otherwise wait for a packet to be sent in the normal course of
|
---|
| 631 | * events (or more window to be available later) */
|
---|
| 632 | if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
|
---|
| 633 | tcp_ack_now(pcb);
|
---|
| 634 | tcp_output(pcb);
|
---|
| 635 | }
|
---|
| 636 |
|
---|
| 637 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
|
---|
| 638 | len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
|
---|
| 639 | }
|
---|
| 640 |
|
---|
| 641 | /**
|
---|
| 642 | * Allocate a new local TCP port.
|
---|
| 643 | *
|
---|
| 644 | * @return a new (free) local TCP port number
|
---|
| 645 | */
|
---|
| 646 | static u16_t
|
---|
| 647 | tcp_new_port(void)
|
---|
| 648 | {
|
---|
| 649 | u8_t i;
|
---|
| 650 | u16_t n = 0;
|
---|
| 651 | struct tcp_pcb *pcb;
|
---|
| 652 |
|
---|
| 653 | again:
|
---|
| 654 | if (tcp_port++ == TCP_LOCAL_PORT_RANGE_END) {
|
---|
| 655 | tcp_port = TCP_LOCAL_PORT_RANGE_START;
|
---|
| 656 | }
|
---|
| 657 | /* Check all PCB lists. */
|
---|
| 658 | for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
|
---|
| 659 | for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
|
---|
| 660 | if (pcb->local_port == tcp_port) {
|
---|
| 661 | if (++n > (TCP_LOCAL_PORT_RANGE_END - TCP_LOCAL_PORT_RANGE_START)) {
|
---|
| 662 | return 0;
|
---|
| 663 | }
|
---|
| 664 | goto again;
|
---|
| 665 | }
|
---|
| 666 | }
|
---|
| 667 | }
|
---|
| 668 | return tcp_port;
|
---|
| 669 | }
|
---|
| 670 |
|
---|
| 671 | /**
|
---|
| 672 | * Connects to another host. The function given as the "connected"
|
---|
| 673 | * argument will be called when the connection has been established.
|
---|
| 674 | *
|
---|
| 675 | * @param pcb the tcp_pcb used to establish the connection
|
---|
| 676 | * @param ipaddr the remote ip address to connect to
|
---|
| 677 | * @param port the remote tcp port to connect to
|
---|
| 678 | * @param connected callback function to call when connected (or on error)
|
---|
| 679 | * @return ERR_VAL if invalid arguments are given
|
---|
| 680 | * ERR_OK if connect request has been sent
|
---|
| 681 | * other err_t values if connect request couldn't be sent
|
---|
| 682 | */
|
---|
| 683 | err_t
|
---|
| 684 | tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
|
---|
| 685 | tcp_connected_fn connected)
|
---|
| 686 | {
|
---|
| 687 | err_t ret;
|
---|
| 688 | u32_t iss;
|
---|
| 689 | u16_t old_local_port;
|
---|
| 690 |
|
---|
| 691 | LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
|
---|
| 692 |
|
---|
| 693 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
|
---|
| 694 | if (ipaddr != NULL) {
|
---|
| 695 | pcb->remote_ip = *ipaddr;
|
---|
| 696 | } else {
|
---|
| 697 | return ERR_VAL;
|
---|
| 698 | }
|
---|
| 699 | pcb->remote_port = port;
|
---|
| 700 |
|
---|
| 701 | /* check if we have a route to the remote host */
|
---|
| 702 | if (ip_addr_isany(&(pcb->local_ip))) {
|
---|
| 703 | /* no local IP address set, yet. */
|
---|
| 704 | struct netif *netif = ip_route(&(pcb->remote_ip));
|
---|
| 705 | if (netif == NULL) {
|
---|
| 706 | /* Don't even try to send a SYN packet if we have no route
|
---|
| 707 | since that will fail. */
|
---|
| 708 | return ERR_RTE;
|
---|
| 709 | }
|
---|
| 710 | /* Use the netif's IP address as local address. */
|
---|
| 711 | ip_addr_copy(pcb->local_ip, netif->ip_addr);
|
---|
| 712 | }
|
---|
| 713 |
|
---|
| 714 | old_local_port = pcb->local_port;
|
---|
| 715 | if (pcb->local_port == 0) {
|
---|
| 716 | pcb->local_port = tcp_new_port();
|
---|
| 717 | if (pcb->local_port == 0) {
|
---|
| 718 | return ERR_BUF;
|
---|
| 719 | }
|
---|
| 720 | }
|
---|
| 721 | #if SO_REUSE
|
---|
| 722 | if (ip_get_option(pcb, SOF_REUSEADDR)) {
|
---|
| 723 | /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
|
---|
| 724 | now that the 5-tuple is unique. */
|
---|
| 725 | struct tcp_pcb *cpcb;
|
---|
| 726 | int i;
|
---|
| 727 | /* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
|
---|
| 728 | for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
|
---|
| 729 | for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
|
---|
| 730 | if ((cpcb->local_port == pcb->local_port) &&
|
---|
| 731 | (cpcb->remote_port == port) &&
|
---|
| 732 | ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
|
---|
| 733 | ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
|
---|
| 734 | /* linux returns EISCONN here, but ERR_USE should be OK for us */
|
---|
| 735 | return ERR_USE;
|
---|
| 736 | }
|
---|
| 737 | }
|
---|
| 738 | }
|
---|
| 739 | }
|
---|
| 740 | #endif /* SO_REUSE */
|
---|
| 741 | iss = tcp_next_iss();
|
---|
| 742 | pcb->rcv_nxt = 0;
|
---|
| 743 | pcb->snd_nxt = iss;
|
---|
| 744 | pcb->lastack = iss - 1;
|
---|
| 745 | pcb->snd_lbb = iss - 1;
|
---|
| 746 | pcb->rcv_wnd = TCP_WND;
|
---|
| 747 | pcb->rcv_ann_wnd = TCP_WND;
|
---|
| 748 | pcb->rcv_ann_right_edge = pcb->rcv_nxt;
|
---|
| 749 | pcb->snd_wnd = TCP_WND;
|
---|
| 750 | /* As initial send MSS, we use TCP_MSS but limit it to 536.
|
---|
| 751 | The send MSS is updated when an MSS option is received. */
|
---|
| 752 | pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
|
---|
| 753 | #if TCP_CALCULATE_EFF_SEND_MSS
|
---|
| 754 | pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
|
---|
| 755 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */
|
---|
| 756 | pcb->cwnd = 1;
|
---|
| 757 | pcb->ssthresh = pcb->mss * 10;
|
---|
| 758 | #if LWIP_CALLBACK_API
|
---|
| 759 | pcb->connected = connected;
|
---|
| 760 | #else /* LWIP_CALLBACK_API */
|
---|
| 761 | LWIP_UNUSED_ARG(connected);
|
---|
| 762 | #endif /* LWIP_CALLBACK_API */
|
---|
| 763 |
|
---|
| 764 | /* Send a SYN together with the MSS option. */
|
---|
| 765 | ret = tcp_enqueue_flags(pcb, TCP_SYN);
|
---|
| 766 | if (ret == ERR_OK) {
|
---|
| 767 | /* SYN segment was enqueued, changed the pcbs state now */
|
---|
| 768 | pcb->state = SYN_SENT;
|
---|
| 769 | if (old_local_port != 0) {
|
---|
| 770 | TCP_RMV(&tcp_bound_pcbs, pcb);
|
---|
| 771 | }
|
---|
| 772 | TCP_REG_ACTIVE(pcb);
|
---|
| 773 | snmp_inc_tcpactiveopens();
|
---|
| 774 |
|
---|
| 775 | tcp_output(pcb);
|
---|
| 776 | }
|
---|
| 777 | return ret;
|
---|
| 778 | }
|
---|
| 779 |
|
---|
| 780 | /**
|
---|
| 781 | * Called every 500 ms and implements the retransmission timer and the timer that
|
---|
| 782 | * removes PCBs that have been in TIME-WAIT for enough time. It also increments
|
---|
| 783 | * various timers such as the inactivity timer in each PCB.
|
---|
| 784 | *
|
---|
| 785 | * Automatically called from tcp_tmr().
|
---|
| 786 | */
|
---|
| 787 | void
|
---|
| 788 | tcp_slowtmr(void)
|
---|
| 789 | {
|
---|
| 790 | struct tcp_pcb *pcb, *prev;
|
---|
| 791 | u16_t eff_wnd;
|
---|
| 792 | u8_t pcb_remove; /* flag if a PCB should be removed */
|
---|
| 793 | u8_t pcb_reset; /* flag if a RST should be sent when removing */
|
---|
| 794 | err_t err;
|
---|
| 795 |
|
---|
| 796 | err = ERR_OK;
|
---|
| 797 |
|
---|
| 798 | ++tcp_ticks;
|
---|
| 799 | ++tcp_timer_ctr;
|
---|
| 800 |
|
---|
| 801 | tcp_slowtmr_start:
|
---|
| 802 | /* Steps through all of the active PCBs. */
|
---|
| 803 | prev = NULL;
|
---|
| 804 | pcb = tcp_active_pcbs;
|
---|
| 805 | if (pcb == NULL) {
|
---|
| 806 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
|
---|
| 807 | }
|
---|
| 808 | while (pcb != NULL) {
|
---|
| 809 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
|
---|
| 810 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
|
---|
| 811 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
|
---|
| 812 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
|
---|
| 813 | if (pcb->last_timer == tcp_timer_ctr) {
|
---|
| 814 | /* skip this pcb, we have already processed it */
|
---|
| 815 | pcb = pcb->next;
|
---|
| 816 | continue;
|
---|
| 817 | }
|
---|
| 818 | pcb->last_timer = tcp_timer_ctr;
|
---|
| 819 |
|
---|
| 820 | pcb_remove = 0;
|
---|
| 821 | pcb_reset = 0;
|
---|
| 822 |
|
---|
| 823 | if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
|
---|
| 824 | ++pcb_remove;
|
---|
| 825 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
|
---|
| 826 | }
|
---|
| 827 | else if (pcb->nrtx == TCP_MAXRTX) {
|
---|
| 828 | ++pcb_remove;
|
---|
| 829 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
|
---|
| 830 | } else {
|
---|
| 831 | if (pcb->persist_backoff > 0) {
|
---|
| 832 | /* If snd_wnd is zero, use persist timer to send 1 byte probes
|
---|
| 833 | * instead of using the standard retransmission mechanism. */
|
---|
| 834 | pcb->persist_cnt++;
|
---|
| 835 | if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
|
---|
| 836 | pcb->persist_cnt = 0;
|
---|
| 837 | if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
|
---|
| 838 | pcb->persist_backoff++;
|
---|
| 839 | }
|
---|
| 840 | tcp_zero_window_probe(pcb);
|
---|
| 841 | }
|
---|
| 842 | } else {
|
---|
| 843 | /* Increase the retransmission timer if it is running */
|
---|
| 844 | if(pcb->rtime >= 0) {
|
---|
| 845 | ++pcb->rtime;
|
---|
| 846 | }
|
---|
| 847 |
|
---|
| 848 | if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
|
---|
| 849 | /* Time for a retransmission. */
|
---|
| 850 | LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
|
---|
| 851 | " pcb->rto %"S16_F"\n",
|
---|
| 852 | pcb->rtime, pcb->rto));
|
---|
| 853 |
|
---|
| 854 | /* Double retransmission time-out unless we are trying to
|
---|
| 855 | * connect to somebody (i.e., we are in SYN_SENT). */
|
---|
| 856 | if (pcb->state != SYN_SENT) {
|
---|
| 857 | pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
|
---|
| 858 | }
|
---|
| 859 |
|
---|
| 860 | /* Reset the retransmission timer. */
|
---|
| 861 | pcb->rtime = 0;
|
---|
| 862 |
|
---|
| 863 | /* Reduce congestion window and ssthresh. */
|
---|
| 864 | eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
|
---|
| 865 | pcb->ssthresh = eff_wnd >> 1;
|
---|
| 866 | if (pcb->ssthresh < (pcb->mss << 1)) {
|
---|
| 867 | pcb->ssthresh = (pcb->mss << 1);
|
---|
| 868 | }
|
---|
| 869 | pcb->cwnd = pcb->mss;
|
---|
| 870 | LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
|
---|
| 871 | " ssthresh %"U16_F"\n",
|
---|
| 872 | pcb->cwnd, pcb->ssthresh));
|
---|
| 873 |
|
---|
| 874 | /* The following needs to be called AFTER cwnd is set to one
|
---|
| 875 | mss - STJ */
|
---|
| 876 | tcp_rexmit_rto(pcb);
|
---|
| 877 | }
|
---|
| 878 | }
|
---|
| 879 | }
|
---|
| 880 | /* Check if this PCB has stayed too long in FIN-WAIT-2 */
|
---|
| 881 | if (pcb->state == FIN_WAIT_2) {
|
---|
| 882 | /* If this PCB is in FIN_WAIT_2 because of SHUT_WR don't let it time out. */
|
---|
| 883 | if (pcb->flags & TF_RXCLOSED) {
|
---|
| 884 | /* PCB was fully closed (either through close() or SHUT_RDWR):
|
---|
| 885 | normal FIN-WAIT timeout handling. */
|
---|
| 886 | if ((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
| 887 | TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
|
---|
| 888 | ++pcb_remove;
|
---|
| 889 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
|
---|
| 890 | }
|
---|
| 891 | }
|
---|
| 892 | }
|
---|
| 893 |
|
---|
| 894 | /* Check if KEEPALIVE should be sent */
|
---|
| 895 | if(ip_get_option(pcb, SOF_KEEPALIVE) &&
|
---|
| 896 | ((pcb->state == ESTABLISHED) ||
|
---|
| 897 | (pcb->state == CLOSE_WAIT))) {
|
---|
| 898 | if((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
| 899 | (pcb->keep_idle + TCP_KEEP_DUR(pcb)) / TCP_SLOW_INTERVAL)
|
---|
| 900 | {
|
---|
| 901 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
|
---|
| 902 | ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
|
---|
| 903 | ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
|
---|
| 904 |
|
---|
| 905 | ++pcb_remove;
|
---|
| 906 | ++pcb_reset;
|
---|
| 907 | }
|
---|
| 908 | else if((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
| 909 | (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEP_INTVL(pcb))
|
---|
| 910 | / TCP_SLOW_INTERVAL)
|
---|
| 911 | {
|
---|
| 912 | tcp_keepalive(pcb);
|
---|
| 913 | pcb->keep_cnt_sent++;
|
---|
| 914 | }
|
---|
| 915 | }
|
---|
| 916 |
|
---|
| 917 | /* If this PCB has queued out of sequence data, but has been
|
---|
| 918 | inactive for too long, will drop the data (it will eventually
|
---|
| 919 | be retransmitted). */
|
---|
| 920 | #if TCP_QUEUE_OOSEQ
|
---|
| 921 | if (pcb->ooseq != NULL &&
|
---|
| 922 | (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
|
---|
| 923 | tcp_segs_free(pcb->ooseq);
|
---|
| 924 | pcb->ooseq = NULL;
|
---|
| 925 | LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
|
---|
| 926 | }
|
---|
| 927 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
| 928 |
|
---|
| 929 | /* Check if this PCB has stayed too long in SYN-RCVD */
|
---|
| 930 | if (pcb->state == SYN_RCVD) {
|
---|
| 931 | if ((u32_t)(tcp_ticks - pcb->tmr) >
|
---|
| 932 | TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
|
---|
| 933 | ++pcb_remove;
|
---|
| 934 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
|
---|
| 935 | }
|
---|
| 936 | }
|
---|
| 937 |
|
---|
| 938 | /* Check if this PCB has stayed too long in LAST-ACK */
|
---|
| 939 | if (pcb->state == LAST_ACK) {
|
---|
| 940 | if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
|
---|
| 941 | ++pcb_remove;
|
---|
| 942 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
|
---|
| 943 | }
|
---|
| 944 | }
|
---|
| 945 |
|
---|
| 946 | /* If the PCB should be removed, do it. */
|
---|
| 947 | if (pcb_remove) {
|
---|
| 948 | struct tcp_pcb *pcb2;
|
---|
| 949 | tcp_err_fn err_fn;
|
---|
| 950 | void *err_arg;
|
---|
| 951 | tcp_pcb_purge(pcb);
|
---|
| 952 | /* Remove PCB from tcp_active_pcbs list. */
|
---|
| 953 | if (prev != NULL) {
|
---|
| 954 | LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
|
---|
| 955 | prev->next = pcb->next;
|
---|
| 956 | } else {
|
---|
| 957 | /* This PCB was the first. */
|
---|
| 958 | LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
|
---|
| 959 | tcp_active_pcbs = pcb->next;
|
---|
| 960 | }
|
---|
| 961 |
|
---|
| 962 | if (pcb_reset) {
|
---|
| 963 | tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
|
---|
| 964 | pcb->local_port, pcb->remote_port);
|
---|
| 965 | }
|
---|
| 966 |
|
---|
| 967 | err_fn = pcb->errf;
|
---|
| 968 | err_arg = pcb->callback_arg;
|
---|
| 969 | pcb2 = pcb;
|
---|
| 970 | pcb = pcb->next;
|
---|
| 971 | memp_free(MEMP_TCP_PCB, pcb2);
|
---|
| 972 |
|
---|
| 973 | tcp_active_pcbs_changed = 0;
|
---|
| 974 | TCP_EVENT_ERR(err_fn, err_arg, ERR_ABRT);
|
---|
| 975 | if (tcp_active_pcbs_changed) {
|
---|
| 976 | goto tcp_slowtmr_start;
|
---|
| 977 | }
|
---|
| 978 | } else {
|
---|
| 979 | /* get the 'next' element now and work with 'prev' below (in case of abort) */
|
---|
| 980 | prev = pcb;
|
---|
| 981 | pcb = pcb->next;
|
---|
| 982 |
|
---|
| 983 | /* We check if we should poll the connection. */
|
---|
| 984 | ++prev->polltmr;
|
---|
| 985 | if (prev->polltmr >= prev->pollinterval) {
|
---|
| 986 | prev->polltmr = 0;
|
---|
| 987 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
|
---|
| 988 | tcp_active_pcbs_changed = 0;
|
---|
| 989 | TCP_EVENT_POLL(prev, err);
|
---|
| 990 | if (tcp_active_pcbs_changed) {
|
---|
| 991 | goto tcp_slowtmr_start;
|
---|
| 992 | }
|
---|
| 993 | /* if err == ERR_ABRT, 'prev' is already deallocated */
|
---|
| 994 | if (err == ERR_OK) {
|
---|
| 995 | tcp_output(prev);
|
---|
| 996 | }
|
---|
| 997 | }
|
---|
| 998 | }
|
---|
| 999 | }
|
---|
| 1000 |
|
---|
| 1001 |
|
---|
| 1002 | /* Steps through all of the TIME-WAIT PCBs. */
|
---|
| 1003 | prev = NULL;
|
---|
| 1004 | pcb = tcp_tw_pcbs;
|
---|
| 1005 | while (pcb != NULL) {
|
---|
| 1006 | LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
|
---|
| 1007 | pcb_remove = 0;
|
---|
| 1008 |
|
---|
| 1009 | /* Check if this PCB has stayed long enough in TIME-WAIT */
|
---|
| 1010 | if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
|
---|
| 1011 | ++pcb_remove;
|
---|
| 1012 | }
|
---|
| 1013 |
|
---|
| 1014 |
|
---|
| 1015 |
|
---|
| 1016 | /* If the PCB should be removed, do it. */
|
---|
| 1017 | if (pcb_remove) {
|
---|
| 1018 | struct tcp_pcb *pcb2;
|
---|
| 1019 | tcp_pcb_purge(pcb);
|
---|
| 1020 | /* Remove PCB from tcp_tw_pcbs list. */
|
---|
| 1021 | if (prev != NULL) {
|
---|
| 1022 | LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
|
---|
| 1023 | prev->next = pcb->next;
|
---|
| 1024 | } else {
|
---|
| 1025 | /* This PCB was the first. */
|
---|
| 1026 | LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
|
---|
| 1027 | tcp_tw_pcbs = pcb->next;
|
---|
| 1028 | }
|
---|
| 1029 | pcb2 = pcb;
|
---|
| 1030 | pcb = pcb->next;
|
---|
| 1031 | memp_free(MEMP_TCP_PCB, pcb2);
|
---|
| 1032 | } else {
|
---|
| 1033 | prev = pcb;
|
---|
| 1034 | pcb = pcb->next;
|
---|
| 1035 | }
|
---|
| 1036 | }
|
---|
| 1037 | }
|
---|
| 1038 |
|
---|
| 1039 | /**
|
---|
| 1040 | * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
|
---|
| 1041 | * "refused" by upper layer (application) and sends delayed ACKs.
|
---|
| 1042 | *
|
---|
| 1043 | * Automatically called from tcp_tmr().
|
---|
| 1044 | */
|
---|
| 1045 | void
|
---|
| 1046 | tcp_fasttmr(void)
|
---|
| 1047 | {
|
---|
| 1048 | struct tcp_pcb *pcb;
|
---|
| 1049 |
|
---|
| 1050 | ++tcp_timer_ctr;
|
---|
| 1051 |
|
---|
| 1052 | tcp_fasttmr_start:
|
---|
| 1053 | pcb = tcp_active_pcbs;
|
---|
| 1054 |
|
---|
| 1055 | while(pcb != NULL) {
|
---|
| 1056 | if (pcb->last_timer != tcp_timer_ctr) {
|
---|
| 1057 | struct tcp_pcb *next;
|
---|
| 1058 | pcb->last_timer = tcp_timer_ctr;
|
---|
| 1059 | /* send delayed ACKs */
|
---|
| 1060 | if (pcb->flags & TF_ACK_DELAY) {
|
---|
| 1061 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
|
---|
| 1062 | tcp_ack_now(pcb);
|
---|
| 1063 | tcp_output(pcb);
|
---|
| 1064 | pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
|
---|
| 1065 | }
|
---|
| 1066 |
|
---|
| 1067 | next = pcb->next;
|
---|
| 1068 |
|
---|
| 1069 | /* If there is data which was previously "refused" by upper layer */
|
---|
| 1070 | if (pcb->refused_data != NULL) {
|
---|
| 1071 | tcp_active_pcbs_changed = 0;
|
---|
| 1072 | tcp_process_refused_data(pcb);
|
---|
| 1073 | if (tcp_active_pcbs_changed) {
|
---|
| 1074 | /* application callback has changed the pcb list: restart the loop */
|
---|
| 1075 | goto tcp_fasttmr_start;
|
---|
| 1076 | }
|
---|
| 1077 | }
|
---|
| 1078 | pcb = next;
|
---|
| 1079 | }
|
---|
| 1080 | }
|
---|
| 1081 | }
|
---|
| 1082 |
|
---|
| 1083 | /** Pass pcb->refused_data to the recv callback */
|
---|
| 1084 | err_t
|
---|
| 1085 | tcp_process_refused_data(struct tcp_pcb *pcb)
|
---|
| 1086 | {
|
---|
| 1087 | err_t err;
|
---|
| 1088 | u8_t refused_flags = pcb->refused_data->flags;
|
---|
| 1089 | /* set pcb->refused_data to NULL in case the callback frees it and then
|
---|
| 1090 | closes the pcb */
|
---|
| 1091 | struct pbuf *refused_data = pcb->refused_data;
|
---|
| 1092 | pcb->refused_data = NULL;
|
---|
| 1093 | /* Notify again application with data previously received. */
|
---|
| 1094 | LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: notify kept packet\n"));
|
---|
| 1095 | TCP_EVENT_RECV(pcb, refused_data, ERR_OK, err);
|
---|
| 1096 | if (err == ERR_OK) {
|
---|
| 1097 | /* did refused_data include a FIN? */
|
---|
| 1098 | if (refused_flags & PBUF_FLAG_TCP_FIN) {
|
---|
| 1099 | /* correct rcv_wnd as the application won't call tcp_recved()
|
---|
| 1100 | for the FIN's seqno */
|
---|
| 1101 | if (pcb->rcv_wnd != TCP_WND) {
|
---|
| 1102 | pcb->rcv_wnd++;
|
---|
| 1103 | }
|
---|
| 1104 | TCP_EVENT_CLOSED(pcb, err);
|
---|
| 1105 | if (err == ERR_ABRT) {
|
---|
| 1106 | return ERR_ABRT;
|
---|
| 1107 | }
|
---|
| 1108 | }
|
---|
| 1109 | } else if (err == ERR_ABRT) {
|
---|
| 1110 | /* if err == ERR_ABRT, 'pcb' is already deallocated */
|
---|
| 1111 | /* Drop incoming packets because pcb is "full" (only if the incoming
|
---|
| 1112 | segment contains data). */
|
---|
| 1113 | LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: drop incoming packets, because pcb is \"full\"\n"));
|
---|
| 1114 | return ERR_ABRT;
|
---|
| 1115 | } else {
|
---|
| 1116 | /* data is still refused, pbuf is still valid (go on for ACK-only packets) */
|
---|
| 1117 | pcb->refused_data = refused_data;
|
---|
| 1118 | }
|
---|
| 1119 | return ERR_OK;
|
---|
| 1120 | }
|
---|
| 1121 |
|
---|
| 1122 | /**
|
---|
| 1123 | * Deallocates a list of TCP segments (tcp_seg structures).
|
---|
| 1124 | *
|
---|
| 1125 | * @param seg tcp_seg list of TCP segments to free
|
---|
| 1126 | */
|
---|
| 1127 | void
|
---|
| 1128 | tcp_segs_free(struct tcp_seg *seg)
|
---|
| 1129 | {
|
---|
| 1130 | while (seg != NULL) {
|
---|
| 1131 | struct tcp_seg *next = seg->next;
|
---|
| 1132 | tcp_seg_free(seg);
|
---|
| 1133 | seg = next;
|
---|
| 1134 | }
|
---|
| 1135 | }
|
---|
| 1136 |
|
---|
| 1137 | /**
|
---|
| 1138 | * Frees a TCP segment (tcp_seg structure).
|
---|
| 1139 | *
|
---|
| 1140 | * @param seg single tcp_seg to free
|
---|
| 1141 | */
|
---|
| 1142 | void
|
---|
| 1143 | tcp_seg_free(struct tcp_seg *seg)
|
---|
| 1144 | {
|
---|
| 1145 | if (seg != NULL) {
|
---|
| 1146 | if (seg->p != NULL) {
|
---|
| 1147 | pbuf_free(seg->p);
|
---|
| 1148 | #if TCP_DEBUG
|
---|
| 1149 | seg->p = NULL;
|
---|
| 1150 | #endif /* TCP_DEBUG */
|
---|
| 1151 | }
|
---|
| 1152 | memp_free(MEMP_TCP_SEG, seg);
|
---|
| 1153 | }
|
---|
| 1154 | }
|
---|
| 1155 |
|
---|
| 1156 | /**
|
---|
| 1157 | * Sets the priority of a connection.
|
---|
| 1158 | *
|
---|
| 1159 | * @param pcb the tcp_pcb to manipulate
|
---|
| 1160 | * @param prio new priority
|
---|
| 1161 | */
|
---|
| 1162 | void
|
---|
| 1163 | tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
|
---|
| 1164 | {
|
---|
| 1165 | pcb->prio = prio;
|
---|
| 1166 | }
|
---|
| 1167 |
|
---|
| 1168 | #if TCP_QUEUE_OOSEQ
|
---|
| 1169 | /**
|
---|
| 1170 | * Returns a copy of the given TCP segment.
|
---|
| 1171 | * The pbuf and data are not copied, only the pointers
|
---|
| 1172 | *
|
---|
| 1173 | * @param seg the old tcp_seg
|
---|
| 1174 | * @return a copy of seg
|
---|
| 1175 | */
|
---|
| 1176 | struct tcp_seg *
|
---|
| 1177 | tcp_seg_copy(struct tcp_seg *seg)
|
---|
| 1178 | {
|
---|
| 1179 | struct tcp_seg *cseg;
|
---|
| 1180 |
|
---|
| 1181 | cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
|
---|
| 1182 | if (cseg == NULL) {
|
---|
| 1183 | return NULL;
|
---|
| 1184 | }
|
---|
| 1185 | SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
|
---|
| 1186 | pbuf_ref(cseg->p);
|
---|
| 1187 | return cseg;
|
---|
| 1188 | }
|
---|
| 1189 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
| 1190 |
|
---|
| 1191 | #if LWIP_CALLBACK_API
|
---|
| 1192 | /**
|
---|
| 1193 | * Default receive callback that is called if the user didn't register
|
---|
| 1194 | * a recv callback for the pcb.
|
---|
| 1195 | */
|
---|
| 1196 | err_t
|
---|
| 1197 | tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
|
---|
| 1198 | {
|
---|
| 1199 | LWIP_UNUSED_ARG(arg);
|
---|
| 1200 | if (p != NULL) {
|
---|
| 1201 | tcp_recved(pcb, p->tot_len);
|
---|
| 1202 | pbuf_free(p);
|
---|
| 1203 | } else if (err == ERR_OK) {
|
---|
| 1204 | return tcp_close(pcb);
|
---|
| 1205 | }
|
---|
| 1206 | return ERR_OK;
|
---|
| 1207 | }
|
---|
| 1208 | #endif /* LWIP_CALLBACK_API */
|
---|
| 1209 |
|
---|
| 1210 | /**
|
---|
| 1211 | * Kills the oldest active connection that has the same or lower priority than
|
---|
| 1212 | * 'prio'.
|
---|
| 1213 | *
|
---|
| 1214 | * @param prio minimum priority
|
---|
| 1215 | */
|
---|
| 1216 | static void
|
---|
| 1217 | tcp_kill_prio(u8_t prio)
|
---|
| 1218 | {
|
---|
| 1219 | struct tcp_pcb *pcb, *inactive;
|
---|
| 1220 | u32_t inactivity;
|
---|
| 1221 | u8_t mprio;
|
---|
| 1222 |
|
---|
| 1223 |
|
---|
| 1224 | mprio = TCP_PRIO_MAX;
|
---|
| 1225 |
|
---|
| 1226 | /* We kill the oldest active connection that has lower priority than prio. */
|
---|
| 1227 | inactivity = 0;
|
---|
| 1228 | inactive = NULL;
|
---|
| 1229 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
| 1230 | if (pcb->prio <= prio &&
|
---|
| 1231 | pcb->prio <= mprio &&
|
---|
| 1232 | (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
|
---|
| 1233 | inactivity = tcp_ticks - pcb->tmr;
|
---|
| 1234 | inactive = pcb;
|
---|
| 1235 | mprio = pcb->prio;
|
---|
| 1236 | }
|
---|
| 1237 | }
|
---|
| 1238 | if (inactive != NULL) {
|
---|
| 1239 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
|
---|
| 1240 | (void *)inactive, inactivity));
|
---|
| 1241 | tcp_abort(inactive);
|
---|
| 1242 | }
|
---|
| 1243 | }
|
---|
| 1244 |
|
---|
| 1245 | /**
|
---|
| 1246 | * Kills the oldest connection that is in TIME_WAIT state.
|
---|
| 1247 | * Called from tcp_alloc() if no more connections are available.
|
---|
| 1248 | */
|
---|
| 1249 | static void
|
---|
| 1250 | tcp_kill_timewait(void)
|
---|
| 1251 | {
|
---|
| 1252 | struct tcp_pcb *pcb, *inactive;
|
---|
| 1253 | u32_t inactivity;
|
---|
| 1254 |
|
---|
| 1255 | inactivity = 0;
|
---|
| 1256 | inactive = NULL;
|
---|
| 1257 | /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
|
---|
| 1258 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
| 1259 | if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
|
---|
| 1260 | inactivity = tcp_ticks - pcb->tmr;
|
---|
| 1261 | inactive = pcb;
|
---|
| 1262 | }
|
---|
| 1263 | }
|
---|
| 1264 | if (inactive != NULL) {
|
---|
| 1265 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
|
---|
| 1266 | (void *)inactive, inactivity));
|
---|
| 1267 | tcp_abort(inactive);
|
---|
| 1268 | }
|
---|
| 1269 | }
|
---|
| 1270 |
|
---|
| 1271 | /**
|
---|
| 1272 | * Allocate a new tcp_pcb structure.
|
---|
| 1273 | *
|
---|
| 1274 | * @param prio priority for the new pcb
|
---|
| 1275 | * @return a new tcp_pcb that initially is in state CLOSED
|
---|
| 1276 | */
|
---|
| 1277 | struct tcp_pcb *
|
---|
| 1278 | tcp_alloc(u8_t prio)
|
---|
| 1279 | {
|
---|
| 1280 | struct tcp_pcb *pcb;
|
---|
| 1281 | u32_t iss;
|
---|
| 1282 |
|
---|
| 1283 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
| 1284 | if (pcb == NULL) {
|
---|
| 1285 | /* Try killing oldest connection in TIME-WAIT. */
|
---|
| 1286 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
|
---|
| 1287 | tcp_kill_timewait();
|
---|
| 1288 | /* Try to allocate a tcp_pcb again. */
|
---|
| 1289 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
| 1290 | if (pcb == NULL) {
|
---|
| 1291 | /* Try killing active connections with lower priority than the new one. */
|
---|
| 1292 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
|
---|
| 1293 | tcp_kill_prio(prio);
|
---|
| 1294 | /* Try to allocate a tcp_pcb again. */
|
---|
| 1295 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
|
---|
| 1296 | if (pcb != NULL) {
|
---|
| 1297 | /* adjust err stats: memp_malloc failed twice before */
|
---|
| 1298 | MEMP_STATS_DEC(err, MEMP_TCP_PCB);
|
---|
| 1299 | }
|
---|
| 1300 | }
|
---|
| 1301 | if (pcb != NULL) {
|
---|
| 1302 | /* adjust err stats: timewait PCB was freed above */
|
---|
| 1303 | MEMP_STATS_DEC(err, MEMP_TCP_PCB);
|
---|
| 1304 | }
|
---|
| 1305 | }
|
---|
| 1306 | if (pcb != NULL) {
|
---|
| 1307 | memset(pcb, 0, sizeof(struct tcp_pcb));
|
---|
| 1308 | pcb->prio = prio;
|
---|
| 1309 | pcb->snd_buf = TCP_SND_BUF;
|
---|
| 1310 | pcb->snd_queuelen = 0;
|
---|
| 1311 | pcb->rcv_wnd = TCP_WND;
|
---|
| 1312 | pcb->rcv_ann_wnd = TCP_WND;
|
---|
| 1313 | pcb->tos = 0;
|
---|
| 1314 | pcb->ttl = TCP_TTL;
|
---|
| 1315 | /* As initial send MSS, we use TCP_MSS but limit it to 536.
|
---|
| 1316 | The send MSS is updated when an MSS option is received. */
|
---|
| 1317 | pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
|
---|
| 1318 | pcb->rto = 3000 / TCP_SLOW_INTERVAL;
|
---|
| 1319 | pcb->sa = 0;
|
---|
| 1320 | pcb->sv = 3000 / TCP_SLOW_INTERVAL;
|
---|
| 1321 | pcb->rtime = -1;
|
---|
| 1322 | pcb->cwnd = 1;
|
---|
| 1323 | iss = tcp_next_iss();
|
---|
| 1324 | pcb->snd_wl2 = iss;
|
---|
| 1325 | pcb->snd_nxt = iss;
|
---|
| 1326 | pcb->lastack = iss;
|
---|
| 1327 | pcb->snd_lbb = iss;
|
---|
| 1328 | pcb->tmr = tcp_ticks;
|
---|
| 1329 | pcb->last_timer = tcp_timer_ctr;
|
---|
| 1330 |
|
---|
| 1331 | pcb->polltmr = 0;
|
---|
| 1332 |
|
---|
| 1333 | #if LWIP_CALLBACK_API
|
---|
| 1334 | pcb->recv = tcp_recv_null;
|
---|
| 1335 | #endif /* LWIP_CALLBACK_API */
|
---|
| 1336 |
|
---|
| 1337 | /* Init KEEPALIVE timer */
|
---|
| 1338 | pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
|
---|
| 1339 |
|
---|
| 1340 | #if LWIP_TCP_KEEPALIVE
|
---|
| 1341 | pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
|
---|
| 1342 | pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
|
---|
| 1343 | #endif /* LWIP_TCP_KEEPALIVE */
|
---|
| 1344 |
|
---|
| 1345 | pcb->keep_cnt_sent = 0;
|
---|
| 1346 | }
|
---|
| 1347 | return pcb;
|
---|
| 1348 | }
|
---|
| 1349 |
|
---|
| 1350 | /**
|
---|
| 1351 | * Creates a new TCP protocol control block but doesn't place it on
|
---|
| 1352 | * any of the TCP PCB lists.
|
---|
| 1353 | * The pcb is not put on any list until binding using tcp_bind().
|
---|
| 1354 | *
|
---|
| 1355 | * @internal: Maybe there should be a idle TCP PCB list where these
|
---|
| 1356 | * PCBs are put on. Port reservation using tcp_bind() is implemented but
|
---|
| 1357 | * allocated pcbs that are not bound can't be killed automatically if wanting
|
---|
| 1358 | * to allocate a pcb with higher prio (@see tcp_kill_prio())
|
---|
| 1359 | *
|
---|
| 1360 | * @return a new tcp_pcb that initially is in state CLOSED
|
---|
| 1361 | */
|
---|
| 1362 | struct tcp_pcb *
|
---|
| 1363 | tcp_new(void)
|
---|
| 1364 | {
|
---|
| 1365 | return tcp_alloc(TCP_PRIO_NORMAL);
|
---|
| 1366 | }
|
---|
| 1367 |
|
---|
| 1368 | /**
|
---|
| 1369 | * Used to specify the argument that should be passed callback
|
---|
| 1370 | * functions.
|
---|
| 1371 | *
|
---|
| 1372 | * @param pcb tcp_pcb to set the callback argument
|
---|
| 1373 | * @param arg void pointer argument to pass to callback functions
|
---|
| 1374 | */
|
---|
| 1375 | void
|
---|
| 1376 | tcp_arg(struct tcp_pcb *pcb, void *arg)
|
---|
| 1377 | {
|
---|
| 1378 | /* This function is allowed to be called for both listen pcbs and
|
---|
| 1379 | connection pcbs. */
|
---|
| 1380 | pcb->callback_arg = arg;
|
---|
| 1381 | }
|
---|
| 1382 | #if LWIP_CALLBACK_API
|
---|
| 1383 |
|
---|
| 1384 | /**
|
---|
| 1385 | * Used to specify the function that should be called when a TCP
|
---|
| 1386 | * connection receives data.
|
---|
| 1387 | *
|
---|
| 1388 | * @param pcb tcp_pcb to set the recv callback
|
---|
| 1389 | * @param recv callback function to call for this pcb when data is received
|
---|
| 1390 | */
|
---|
| 1391 | void
|
---|
| 1392 | tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
|
---|
| 1393 | {
|
---|
| 1394 | LWIP_ASSERT("invalid socket state for recv callback", pcb->state != LISTEN);
|
---|
| 1395 | pcb->recv = recv;
|
---|
| 1396 | }
|
---|
| 1397 |
|
---|
| 1398 | /**
|
---|
| 1399 | * Used to specify the function that should be called when TCP data
|
---|
| 1400 | * has been successfully delivered to the remote host.
|
---|
| 1401 | *
|
---|
| 1402 | * @param pcb tcp_pcb to set the sent callback
|
---|
| 1403 | * @param sent callback function to call for this pcb when data is successfully sent
|
---|
| 1404 | */
|
---|
| 1405 | void
|
---|
| 1406 | tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
|
---|
| 1407 | {
|
---|
| 1408 | LWIP_ASSERT("invalid socket state for sent callback", pcb->state != LISTEN);
|
---|
| 1409 | pcb->sent = sent;
|
---|
| 1410 | }
|
---|
| 1411 |
|
---|
| 1412 | /**
|
---|
| 1413 | * Used to specify the function that should be called when a fatal error
|
---|
| 1414 | * has occured on the connection.
|
---|
| 1415 | *
|
---|
| 1416 | * @param pcb tcp_pcb to set the err callback
|
---|
| 1417 | * @param err callback function to call for this pcb when a fatal error
|
---|
| 1418 | * has occured on the connection
|
---|
| 1419 | */
|
---|
| 1420 | void
|
---|
| 1421 | tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
|
---|
| 1422 | {
|
---|
| 1423 | LWIP_ASSERT("invalid socket state for err callback", pcb->state != LISTEN);
|
---|
| 1424 | pcb->errf = err;
|
---|
| 1425 | }
|
---|
| 1426 |
|
---|
| 1427 | /**
|
---|
| 1428 | * Used for specifying the function that should be called when a
|
---|
| 1429 | * LISTENing connection has been connected to another host.
|
---|
| 1430 | *
|
---|
| 1431 | * @param pcb tcp_pcb to set the accept callback
|
---|
| 1432 | * @param accept callback function to call for this pcb when LISTENing
|
---|
| 1433 | * connection has been connected to another host
|
---|
| 1434 | */
|
---|
| 1435 | void
|
---|
| 1436 | tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
|
---|
| 1437 | {
|
---|
| 1438 | /* This function is allowed to be called for both listen pcbs and
|
---|
| 1439 | connection pcbs. */
|
---|
| 1440 | pcb->accept = accept;
|
---|
| 1441 | }
|
---|
| 1442 | #endif /* LWIP_CALLBACK_API */
|
---|
| 1443 |
|
---|
| 1444 |
|
---|
| 1445 | /**
|
---|
| 1446 | * Used to specify the function that should be called periodically
|
---|
| 1447 | * from TCP. The interval is specified in terms of the TCP coarse
|
---|
| 1448 | * timer interval, which is called twice a second.
|
---|
| 1449 | *
|
---|
| 1450 | */
|
---|
| 1451 | void
|
---|
| 1452 | tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
|
---|
| 1453 | {
|
---|
| 1454 | LWIP_ASSERT("invalid socket state for poll", pcb->state != LISTEN);
|
---|
| 1455 | #if LWIP_CALLBACK_API
|
---|
| 1456 | pcb->poll = poll;
|
---|
| 1457 | #else /* LWIP_CALLBACK_API */
|
---|
| 1458 | LWIP_UNUSED_ARG(poll);
|
---|
| 1459 | #endif /* LWIP_CALLBACK_API */
|
---|
| 1460 | pcb->pollinterval = interval;
|
---|
| 1461 | }
|
---|
| 1462 |
|
---|
| 1463 | /**
|
---|
| 1464 | * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
|
---|
| 1465 | * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
|
---|
| 1466 | *
|
---|
| 1467 | * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
|
---|
| 1468 | */
|
---|
| 1469 | void
|
---|
| 1470 | tcp_pcb_purge(struct tcp_pcb *pcb)
|
---|
| 1471 | {
|
---|
| 1472 | if (pcb->state != CLOSED &&
|
---|
| 1473 | pcb->state != TIME_WAIT &&
|
---|
| 1474 | pcb->state != LISTEN) {
|
---|
| 1475 |
|
---|
| 1476 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
|
---|
| 1477 |
|
---|
| 1478 | #if TCP_LISTEN_BACKLOG
|
---|
| 1479 | if (pcb->state == SYN_RCVD) {
|
---|
| 1480 | /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
|
---|
| 1481 | struct tcp_pcb_listen *lpcb;
|
---|
| 1482 | LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
|
---|
| 1483 | tcp_listen_pcbs.listen_pcbs != NULL);
|
---|
| 1484 | for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
|
---|
| 1485 | if ((lpcb->local_port == pcb->local_port) &&
|
---|
| 1486 | (ip_addr_isany(&lpcb->local_ip) ||
|
---|
| 1487 | ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
|
---|
| 1488 | /* port and address of the listen pcb match the timed-out pcb */
|
---|
| 1489 | LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
|
---|
| 1490 | lpcb->accepts_pending > 0);
|
---|
| 1491 | lpcb->accepts_pending--;
|
---|
| 1492 | break;
|
---|
| 1493 | }
|
---|
| 1494 | }
|
---|
| 1495 | }
|
---|
| 1496 | #endif /* TCP_LISTEN_BACKLOG */
|
---|
| 1497 |
|
---|
| 1498 |
|
---|
| 1499 | if (pcb->refused_data != NULL) {
|
---|
| 1500 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
|
---|
| 1501 | pbuf_free(pcb->refused_data);
|
---|
| 1502 | pcb->refused_data = NULL;
|
---|
| 1503 | }
|
---|
| 1504 | if (pcb->unsent != NULL) {
|
---|
| 1505 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
|
---|
| 1506 | }
|
---|
| 1507 | if (pcb->unacked != NULL) {
|
---|
| 1508 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
|
---|
| 1509 | }
|
---|
| 1510 | #if TCP_QUEUE_OOSEQ
|
---|
| 1511 | if (pcb->ooseq != NULL) {
|
---|
| 1512 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
|
---|
| 1513 | }
|
---|
| 1514 | tcp_segs_free(pcb->ooseq);
|
---|
| 1515 | pcb->ooseq = NULL;
|
---|
| 1516 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
| 1517 |
|
---|
| 1518 | /* Stop the retransmission timer as it will expect data on unacked
|
---|
| 1519 | queue if it fires */
|
---|
| 1520 | pcb->rtime = -1;
|
---|
| 1521 |
|
---|
| 1522 | tcp_segs_free(pcb->unsent);
|
---|
| 1523 | tcp_segs_free(pcb->unacked);
|
---|
| 1524 | pcb->unacked = pcb->unsent = NULL;
|
---|
| 1525 | #if TCP_OVERSIZE
|
---|
| 1526 | pcb->unsent_oversize = 0;
|
---|
| 1527 | #endif /* TCP_OVERSIZE */
|
---|
| 1528 | }
|
---|
| 1529 | }
|
---|
| 1530 |
|
---|
| 1531 | /**
|
---|
| 1532 | * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
|
---|
| 1533 | *
|
---|
| 1534 | * @param pcblist PCB list to purge.
|
---|
| 1535 | * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
|
---|
| 1536 | */
|
---|
| 1537 | void
|
---|
| 1538 | tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
|
---|
| 1539 | {
|
---|
| 1540 | TCP_RMV(pcblist, pcb);
|
---|
| 1541 |
|
---|
| 1542 | tcp_pcb_purge(pcb);
|
---|
| 1543 |
|
---|
| 1544 | /* if there is an outstanding delayed ACKs, send it */
|
---|
| 1545 | if (pcb->state != TIME_WAIT &&
|
---|
| 1546 | pcb->state != LISTEN &&
|
---|
| 1547 | pcb->flags & TF_ACK_DELAY) {
|
---|
| 1548 | pcb->flags |= TF_ACK_NOW;
|
---|
| 1549 | tcp_output(pcb);
|
---|
| 1550 | }
|
---|
| 1551 |
|
---|
| 1552 | if (pcb->state != LISTEN) {
|
---|
| 1553 | LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
|
---|
| 1554 | LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
|
---|
| 1555 | #if TCP_QUEUE_OOSEQ
|
---|
| 1556 | LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
|
---|
| 1557 | #endif /* TCP_QUEUE_OOSEQ */
|
---|
| 1558 | }
|
---|
| 1559 |
|
---|
| 1560 | pcb->state = CLOSED;
|
---|
| 1561 |
|
---|
| 1562 | LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
|
---|
| 1563 | }
|
---|
| 1564 |
|
---|
| 1565 | /**
|
---|
| 1566 | * Calculates a new initial sequence number for new connections.
|
---|
| 1567 | *
|
---|
| 1568 | * @return u32_t pseudo random sequence number
|
---|
| 1569 | */
|
---|
| 1570 | u32_t
|
---|
| 1571 | tcp_next_iss(void)
|
---|
| 1572 | {
|
---|
| 1573 | static u32_t iss = 6510;
|
---|
| 1574 |
|
---|
| 1575 | iss += tcp_ticks; /* XXX */
|
---|
| 1576 | return iss;
|
---|
| 1577 | }
|
---|
| 1578 |
|
---|
| 1579 | #if TCP_CALCULATE_EFF_SEND_MSS
|
---|
| 1580 | /**
|
---|
| 1581 | * Calcluates the effective send mss that can be used for a specific IP address
|
---|
| 1582 | * by using ip_route to determin the netif used to send to the address and
|
---|
| 1583 | * calculating the minimum of TCP_MSS and that netif's mtu (if set).
|
---|
| 1584 | */
|
---|
| 1585 | u16_t
|
---|
| 1586 | tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
|
---|
| 1587 | {
|
---|
| 1588 | u16_t mss_s;
|
---|
| 1589 | struct netif *outif;
|
---|
| 1590 |
|
---|
| 1591 | outif = ip_route(addr);
|
---|
| 1592 | if ((outif != NULL) && (outif->mtu != 0)) {
|
---|
| 1593 | mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
|
---|
| 1594 | /* RFC 1122, chap 4.2.2.6:
|
---|
| 1595 | * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
|
---|
| 1596 | * We correct for TCP options in tcp_write(), and don't support IP options.
|
---|
| 1597 | */
|
---|
| 1598 | sendmss = LWIP_MIN(sendmss, mss_s);
|
---|
| 1599 | }
|
---|
| 1600 | return sendmss;
|
---|
| 1601 | }
|
---|
| 1602 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */
|
---|
| 1603 |
|
---|
| 1604 | const char*
|
---|
| 1605 | tcp_debug_state_str(enum tcp_state s)
|
---|
| 1606 | {
|
---|
| 1607 | return tcp_state_str[s];
|
---|
| 1608 | }
|
---|
| 1609 |
|
---|
| 1610 | #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
|
---|
| 1611 | /**
|
---|
| 1612 | * Print a tcp header for debugging purposes.
|
---|
| 1613 | *
|
---|
| 1614 | * @param tcphdr pointer to a struct tcp_hdr
|
---|
| 1615 | */
|
---|
| 1616 | void
|
---|
| 1617 | tcp_debug_print(struct tcp_hdr *tcphdr)
|
---|
| 1618 | {
|
---|
| 1619 | LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
|
---|
| 1620 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1621 | LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
|
---|
| 1622 | ntohs(tcphdr->src), ntohs(tcphdr->dest)));
|
---|
| 1623 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1624 | LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
|
---|
| 1625 | ntohl(tcphdr->seqno)));
|
---|
| 1626 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1627 | LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
|
---|
| 1628 | ntohl(tcphdr->ackno)));
|
---|
| 1629 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1630 | LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
|
---|
| 1631 | TCPH_HDRLEN(tcphdr),
|
---|
| 1632 | TCPH_FLAGS(tcphdr) >> 5 & 1,
|
---|
| 1633 | TCPH_FLAGS(tcphdr) >> 4 & 1,
|
---|
| 1634 | TCPH_FLAGS(tcphdr) >> 3 & 1,
|
---|
| 1635 | TCPH_FLAGS(tcphdr) >> 2 & 1,
|
---|
| 1636 | TCPH_FLAGS(tcphdr) >> 1 & 1,
|
---|
| 1637 | TCPH_FLAGS(tcphdr) & 1,
|
---|
| 1638 | ntohs(tcphdr->wnd)));
|
---|
| 1639 | tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
|
---|
| 1640 | LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
|
---|
| 1641 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1642 | LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
|
---|
| 1643 | ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
|
---|
| 1644 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
|
---|
| 1645 | }
|
---|
| 1646 |
|
---|
| 1647 | /**
|
---|
| 1648 | * Print a tcp state for debugging purposes.
|
---|
| 1649 | *
|
---|
| 1650 | * @param s enum tcp_state to print
|
---|
| 1651 | */
|
---|
| 1652 | void
|
---|
| 1653 | tcp_debug_print_state(enum tcp_state s)
|
---|
| 1654 | {
|
---|
| 1655 | LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
|
---|
| 1656 | }
|
---|
| 1657 |
|
---|
| 1658 | /**
|
---|
| 1659 | * Print tcp flags for debugging purposes.
|
---|
| 1660 | *
|
---|
| 1661 | * @param flags tcp flags, all active flags are printed
|
---|
| 1662 | */
|
---|
| 1663 | void
|
---|
| 1664 | tcp_debug_print_flags(u8_t flags)
|
---|
| 1665 | {
|
---|
| 1666 | if (flags & TCP_FIN) {
|
---|
| 1667 | LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
|
---|
| 1668 | }
|
---|
| 1669 | if (flags & TCP_SYN) {
|
---|
| 1670 | LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
|
---|
| 1671 | }
|
---|
| 1672 | if (flags & TCP_RST) {
|
---|
| 1673 | LWIP_DEBUGF(TCP_DEBUG, ("RST "));
|
---|
| 1674 | }
|
---|
| 1675 | if (flags & TCP_PSH) {
|
---|
| 1676 | LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
|
---|
| 1677 | }
|
---|
| 1678 | if (flags & TCP_ACK) {
|
---|
| 1679 | LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
|
---|
| 1680 | }
|
---|
| 1681 | if (flags & TCP_URG) {
|
---|
| 1682 | LWIP_DEBUGF(TCP_DEBUG, ("URG "));
|
---|
| 1683 | }
|
---|
| 1684 | if (flags & TCP_ECE) {
|
---|
| 1685 | LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
|
---|
| 1686 | }
|
---|
| 1687 | if (flags & TCP_CWR) {
|
---|
| 1688 | LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
|
---|
| 1689 | }
|
---|
| 1690 | LWIP_DEBUGF(TCP_DEBUG, ("\n"));
|
---|
| 1691 | }
|
---|
| 1692 |
|
---|
| 1693 | /**
|
---|
| 1694 | * Print all tcp_pcbs in every list for debugging purposes.
|
---|
| 1695 | */
|
---|
| 1696 | void
|
---|
| 1697 | tcp_debug_print_pcbs(void)
|
---|
| 1698 | {
|
---|
| 1699 | struct tcp_pcb *pcb;
|
---|
| 1700 | LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
|
---|
| 1701 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
| 1702 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
|
---|
| 1703 | pcb->local_port, pcb->remote_port,
|
---|
| 1704 | pcb->snd_nxt, pcb->rcv_nxt));
|
---|
| 1705 | tcp_debug_print_state(pcb->state);
|
---|
| 1706 | }
|
---|
| 1707 | LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
|
---|
| 1708 | for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
| 1709 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
|
---|
| 1710 | pcb->local_port, pcb->remote_port,
|
---|
| 1711 | pcb->snd_nxt, pcb->rcv_nxt));
|
---|
| 1712 | tcp_debug_print_state(pcb->state);
|
---|
| 1713 | }
|
---|
| 1714 | LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
|
---|
| 1715 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
| 1716 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
|
---|
| 1717 | pcb->local_port, pcb->remote_port,
|
---|
| 1718 | pcb->snd_nxt, pcb->rcv_nxt));
|
---|
| 1719 | tcp_debug_print_state(pcb->state);
|
---|
| 1720 | }
|
---|
| 1721 | }
|
---|
| 1722 |
|
---|
| 1723 | /**
|
---|
| 1724 | * Check state consistency of the tcp_pcb lists.
|
---|
| 1725 | */
|
---|
| 1726 | s16_t
|
---|
| 1727 | tcp_pcbs_sane(void)
|
---|
| 1728 | {
|
---|
| 1729 | struct tcp_pcb *pcb;
|
---|
| 1730 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
| 1731 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
|
---|
| 1732 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
|
---|
| 1733 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
|
---|
| 1734 | }
|
---|
| 1735 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
|
---|
| 1736 | LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
|
---|
| 1737 | }
|
---|
| 1738 | return 1;
|
---|
| 1739 | }
|
---|
| 1740 | #endif /* TCP_DEBUG */
|
---|
| 1741 |
|
---|
| 1742 | #endif /* LWIP_TCP */
|
---|