A version of LWIP, provided for backwards compatibility.
Dependents: AA_DemoBoard DemoBoard HelloServerDemo DemoBoard_RangeIndicator ... more
trunk/Core/lwIP/core/tcp.c@0:5e1631496985, 2012-05-08 (annotated)
- Committer:
- root@mbed.org
- Date:
- Tue May 08 15:32:10 2012 +0100
- Revision:
- 0:5e1631496985
initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
root@mbed.org | 0:5e1631496985 | 1 | /** |
root@mbed.org | 0:5e1631496985 | 2 | * @file |
root@mbed.org | 0:5e1631496985 | 3 | * Transmission Control Protocol for IP |
root@mbed.org | 0:5e1631496985 | 4 | * |
root@mbed.org | 0:5e1631496985 | 5 | * This file contains common functions for the TCP implementation, such as functinos |
root@mbed.org | 0:5e1631496985 | 6 | * for manipulating the data structures and the TCP timer functions. TCP functions |
root@mbed.org | 0:5e1631496985 | 7 | * related to input and output is found in tcp_in.c and tcp_out.c respectively. |
root@mbed.org | 0:5e1631496985 | 8 | * |
root@mbed.org | 0:5e1631496985 | 9 | */ |
root@mbed.org | 0:5e1631496985 | 10 | |
root@mbed.org | 0:5e1631496985 | 11 | /* |
root@mbed.org | 0:5e1631496985 | 12 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
root@mbed.org | 0:5e1631496985 | 13 | * All rights reserved. |
root@mbed.org | 0:5e1631496985 | 14 | * |
root@mbed.org | 0:5e1631496985 | 15 | * Redistribution and use in source and binary forms, with or without modification, |
root@mbed.org | 0:5e1631496985 | 16 | * are permitted provided that the following conditions are met: |
root@mbed.org | 0:5e1631496985 | 17 | * |
root@mbed.org | 0:5e1631496985 | 18 | * 1. Redistributions of source code must retain the above copyright notice, |
root@mbed.org | 0:5e1631496985 | 19 | * this list of conditions and the following disclaimer. |
root@mbed.org | 0:5e1631496985 | 20 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
root@mbed.org | 0:5e1631496985 | 21 | * this list of conditions and the following disclaimer in the documentation |
root@mbed.org | 0:5e1631496985 | 22 | * and/or other materials provided with the distribution. |
root@mbed.org | 0:5e1631496985 | 23 | * 3. The name of the author may not be used to endorse or promote products |
root@mbed.org | 0:5e1631496985 | 24 | * derived from this software without specific prior written permission. |
root@mbed.org | 0:5e1631496985 | 25 | * |
root@mbed.org | 0:5e1631496985 | 26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
root@mbed.org | 0:5e1631496985 | 27 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
root@mbed.org | 0:5e1631496985 | 28 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
root@mbed.org | 0:5e1631496985 | 29 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
root@mbed.org | 0:5e1631496985 | 30 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
root@mbed.org | 0:5e1631496985 | 31 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
root@mbed.org | 0:5e1631496985 | 32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
root@mbed.org | 0:5e1631496985 | 33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
root@mbed.org | 0:5e1631496985 | 34 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
root@mbed.org | 0:5e1631496985 | 35 | * OF SUCH DAMAGE. |
root@mbed.org | 0:5e1631496985 | 36 | * |
root@mbed.org | 0:5e1631496985 | 37 | * This file is part of the lwIP TCP/IP stack. |
root@mbed.org | 0:5e1631496985 | 38 | * |
root@mbed.org | 0:5e1631496985 | 39 | * Author: Adam Dunkels <adam@sics.se> |
root@mbed.org | 0:5e1631496985 | 40 | * |
root@mbed.org | 0:5e1631496985 | 41 | */ |
root@mbed.org | 0:5e1631496985 | 42 | |
root@mbed.org | 0:5e1631496985 | 43 | #include "lwip/opt.h" |
root@mbed.org | 0:5e1631496985 | 44 | |
root@mbed.org | 0:5e1631496985 | 45 | #if LWIP_TCP /* don't build if not configured for use in lwipopts.h */ |
root@mbed.org | 0:5e1631496985 | 46 | |
root@mbed.org | 0:5e1631496985 | 47 | #include "lwip/def.h" |
root@mbed.org | 0:5e1631496985 | 48 | #include "lwip/mem.h" |
root@mbed.org | 0:5e1631496985 | 49 | #include "lwip/memp.h" |
root@mbed.org | 0:5e1631496985 | 50 | #include "lwip/snmp.h" |
root@mbed.org | 0:5e1631496985 | 51 | #include "lwip/tcp.h" |
root@mbed.org | 0:5e1631496985 | 52 | #include "lwip/debug.h" |
root@mbed.org | 0:5e1631496985 | 53 | |
root@mbed.org | 0:5e1631496985 | 54 | #include <string.h> |
root@mbed.org | 0:5e1631496985 | 55 | |
root@mbed.org | 0:5e1631496985 | 56 | const char *tcp_state_str[] = { |
root@mbed.org | 0:5e1631496985 | 57 | "CLOSED", |
root@mbed.org | 0:5e1631496985 | 58 | "LISTEN", |
root@mbed.org | 0:5e1631496985 | 59 | "SYN_SENT", |
root@mbed.org | 0:5e1631496985 | 60 | "SYN_RCVD", |
root@mbed.org | 0:5e1631496985 | 61 | "ESTABLISHED", |
root@mbed.org | 0:5e1631496985 | 62 | "FIN_WAIT_1", |
root@mbed.org | 0:5e1631496985 | 63 | "FIN_WAIT_2", |
root@mbed.org | 0:5e1631496985 | 64 | "CLOSE_WAIT", |
root@mbed.org | 0:5e1631496985 | 65 | "CLOSING", |
root@mbed.org | 0:5e1631496985 | 66 | "LAST_ACK", |
root@mbed.org | 0:5e1631496985 | 67 | "TIME_WAIT" |
root@mbed.org | 0:5e1631496985 | 68 | }; |
root@mbed.org | 0:5e1631496985 | 69 | |
root@mbed.org | 0:5e1631496985 | 70 | /* Incremented every coarse grained timer shot (typically every 500 ms). */ |
root@mbed.org | 0:5e1631496985 | 71 | u32_t tcp_ticks; |
root@mbed.org | 0:5e1631496985 | 72 | const u8_t tcp_backoff[13] = |
root@mbed.org | 0:5e1631496985 | 73 | { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7}; |
root@mbed.org | 0:5e1631496985 | 74 | /* Times per slowtmr hits */ |
root@mbed.org | 0:5e1631496985 | 75 | const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 }; |
root@mbed.org | 0:5e1631496985 | 76 | |
root@mbed.org | 0:5e1631496985 | 77 | /* The TCP PCB lists. */ |
root@mbed.org | 0:5e1631496985 | 78 | |
root@mbed.org | 0:5e1631496985 | 79 | /** List of all TCP PCBs bound but not yet (connected || listening) */ |
root@mbed.org | 0:5e1631496985 | 80 | struct tcp_pcb *tcp_bound_pcbs; |
root@mbed.org | 0:5e1631496985 | 81 | /** List of all TCP PCBs in LISTEN state */ |
root@mbed.org | 0:5e1631496985 | 82 | union tcp_listen_pcbs_t tcp_listen_pcbs; |
root@mbed.org | 0:5e1631496985 | 83 | /** List of all TCP PCBs that are in a state in which |
root@mbed.org | 0:5e1631496985 | 84 | * they accept or send data. */ |
root@mbed.org | 0:5e1631496985 | 85 | struct tcp_pcb *tcp_active_pcbs; |
root@mbed.org | 0:5e1631496985 | 86 | /** List of all TCP PCBs in TIME-WAIT state */ |
root@mbed.org | 0:5e1631496985 | 87 | struct tcp_pcb *tcp_tw_pcbs; |
root@mbed.org | 0:5e1631496985 | 88 | |
root@mbed.org | 0:5e1631496985 | 89 | struct tcp_pcb *tcp_tmp_pcb; |
root@mbed.org | 0:5e1631496985 | 90 | |
root@mbed.org | 0:5e1631496985 | 91 | static u8_t tcp_timer; |
root@mbed.org | 0:5e1631496985 | 92 | static u16_t tcp_new_port(void); |
root@mbed.org | 0:5e1631496985 | 93 | |
root@mbed.org | 0:5e1631496985 | 94 | /** |
root@mbed.org | 0:5e1631496985 | 95 | * Called periodically to dispatch TCP timers. |
root@mbed.org | 0:5e1631496985 | 96 | * |
root@mbed.org | 0:5e1631496985 | 97 | */ |
root@mbed.org | 0:5e1631496985 | 98 | void |
root@mbed.org | 0:5e1631496985 | 99 | tcp_tmr(void) |
root@mbed.org | 0:5e1631496985 | 100 | { |
root@mbed.org | 0:5e1631496985 | 101 | /* Call tcp_fasttmr() every 250 ms */ |
root@mbed.org | 0:5e1631496985 | 102 | tcp_fasttmr(); |
root@mbed.org | 0:5e1631496985 | 103 | |
root@mbed.org | 0:5e1631496985 | 104 | if (++tcp_timer & 1) { |
root@mbed.org | 0:5e1631496985 | 105 | /* Call tcp_tmr() every 500 ms, i.e., every other timer |
root@mbed.org | 0:5e1631496985 | 106 | tcp_tmr() is called. */ |
root@mbed.org | 0:5e1631496985 | 107 | tcp_slowtmr(); |
root@mbed.org | 0:5e1631496985 | 108 | } |
root@mbed.org | 0:5e1631496985 | 109 | } |
root@mbed.org | 0:5e1631496985 | 110 | |
root@mbed.org | 0:5e1631496985 | 111 | /** |
root@mbed.org | 0:5e1631496985 | 112 | * Closes the connection held by the PCB. |
root@mbed.org | 0:5e1631496985 | 113 | * |
root@mbed.org | 0:5e1631496985 | 114 | * Listening pcbs are freed and may not be referenced any more. |
root@mbed.org | 0:5e1631496985 | 115 | * Connection pcbs are freed if not yet connected and may not be referenced |
root@mbed.org | 0:5e1631496985 | 116 | * any more. If a connection is established (at least SYN received or in |
root@mbed.org | 0:5e1631496985 | 117 | * a closing state), the connection is closed, and put in a closing state. |
root@mbed.org | 0:5e1631496985 | 118 | * The pcb is then automatically freed in tcp_slowtmr(). It is therefore |
root@mbed.org | 0:5e1631496985 | 119 | * unsafe to reference it. |
root@mbed.org | 0:5e1631496985 | 120 | * |
root@mbed.org | 0:5e1631496985 | 121 | * @param pcb the tcp_pcb to close |
root@mbed.org | 0:5e1631496985 | 122 | * @return ERR_OK if connection has been closed |
root@mbed.org | 0:5e1631496985 | 123 | * another err_t if closing failed and pcb is not freed |
root@mbed.org | 0:5e1631496985 | 124 | */ |
root@mbed.org | 0:5e1631496985 | 125 | err_t |
root@mbed.org | 0:5e1631496985 | 126 | tcp_close(struct tcp_pcb *pcb) |
root@mbed.org | 0:5e1631496985 | 127 | { |
root@mbed.org | 0:5e1631496985 | 128 | err_t err; |
root@mbed.org | 0:5e1631496985 | 129 | |
root@mbed.org | 0:5e1631496985 | 130 | #if TCP_DEBUG |
root@mbed.org | 0:5e1631496985 | 131 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in ")); |
root@mbed.org | 0:5e1631496985 | 132 | tcp_debug_print_state(pcb->state); |
root@mbed.org | 0:5e1631496985 | 133 | #endif /* TCP_DEBUG */ |
root@mbed.org | 0:5e1631496985 | 134 | |
root@mbed.org | 0:5e1631496985 | 135 | switch (pcb->state) { |
root@mbed.org | 0:5e1631496985 | 136 | case CLOSED: |
root@mbed.org | 0:5e1631496985 | 137 | /* Closing a pcb in the CLOSED state might seem erroneous, |
root@mbed.org | 0:5e1631496985 | 138 | * however, it is in this state once allocated and as yet unused |
root@mbed.org | 0:5e1631496985 | 139 | * and the user needs some way to free it should the need arise. |
root@mbed.org | 0:5e1631496985 | 140 | * Calling tcp_close() with a pcb that has already been closed, (i.e. twice) |
root@mbed.org | 0:5e1631496985 | 141 | * or for a pcb that has been used and then entered the CLOSED state |
root@mbed.org | 0:5e1631496985 | 142 | * is erroneous, but this should never happen as the pcb has in those cases |
root@mbed.org | 0:5e1631496985 | 143 | * been freed, and so any remaining handles are bogus. */ |
root@mbed.org | 0:5e1631496985 | 144 | err = ERR_OK; |
root@mbed.org | 0:5e1631496985 | 145 | TCP_RMV(&tcp_bound_pcbs, pcb); |
root@mbed.org | 0:5e1631496985 | 146 | memp_free(MEMP_TCP_PCB, pcb); |
root@mbed.org | 0:5e1631496985 | 147 | pcb = NULL; |
root@mbed.org | 0:5e1631496985 | 148 | break; |
root@mbed.org | 0:5e1631496985 | 149 | case LISTEN: |
root@mbed.org | 0:5e1631496985 | 150 | err = ERR_OK; |
root@mbed.org | 0:5e1631496985 | 151 | tcp_pcb_remove((struct tcp_pcb **)&tcp_listen_pcbs.pcbs, pcb); |
root@mbed.org | 0:5e1631496985 | 152 | memp_free(MEMP_TCP_PCB_LISTEN, pcb); |
root@mbed.org | 0:5e1631496985 | 153 | pcb = NULL; |
root@mbed.org | 0:5e1631496985 | 154 | break; |
root@mbed.org | 0:5e1631496985 | 155 | case SYN_SENT: |
root@mbed.org | 0:5e1631496985 | 156 | err = ERR_OK; |
root@mbed.org | 0:5e1631496985 | 157 | tcp_pcb_remove(&tcp_active_pcbs, pcb); |
root@mbed.org | 0:5e1631496985 | 158 | memp_free(MEMP_TCP_PCB, pcb); |
root@mbed.org | 0:5e1631496985 | 159 | pcb = NULL; |
root@mbed.org | 0:5e1631496985 | 160 | snmp_inc_tcpattemptfails(); |
root@mbed.org | 0:5e1631496985 | 161 | break; |
root@mbed.org | 0:5e1631496985 | 162 | case SYN_RCVD: |
root@mbed.org | 0:5e1631496985 | 163 | err = tcp_send_ctrl(pcb, TCP_FIN); |
root@mbed.org | 0:5e1631496985 | 164 | if (err == ERR_OK) { |
root@mbed.org | 0:5e1631496985 | 165 | snmp_inc_tcpattemptfails(); |
root@mbed.org | 0:5e1631496985 | 166 | pcb->state = FIN_WAIT_1; |
root@mbed.org | 0:5e1631496985 | 167 | } |
root@mbed.org | 0:5e1631496985 | 168 | break; |
root@mbed.org | 0:5e1631496985 | 169 | case ESTABLISHED: |
root@mbed.org | 0:5e1631496985 | 170 | err = tcp_send_ctrl(pcb, TCP_FIN); |
root@mbed.org | 0:5e1631496985 | 171 | if (err == ERR_OK) { |
root@mbed.org | 0:5e1631496985 | 172 | snmp_inc_tcpestabresets(); |
root@mbed.org | 0:5e1631496985 | 173 | pcb->state = FIN_WAIT_1; |
root@mbed.org | 0:5e1631496985 | 174 | } |
root@mbed.org | 0:5e1631496985 | 175 | break; |
root@mbed.org | 0:5e1631496985 | 176 | case CLOSE_WAIT: |
root@mbed.org | 0:5e1631496985 | 177 | err = tcp_send_ctrl(pcb, TCP_FIN); |
root@mbed.org | 0:5e1631496985 | 178 | if (err == ERR_OK) { |
root@mbed.org | 0:5e1631496985 | 179 | snmp_inc_tcpestabresets(); |
root@mbed.org | 0:5e1631496985 | 180 | pcb->state = LAST_ACK; |
root@mbed.org | 0:5e1631496985 | 181 | } |
root@mbed.org | 0:5e1631496985 | 182 | break; |
root@mbed.org | 0:5e1631496985 | 183 | default: |
root@mbed.org | 0:5e1631496985 | 184 | /* Has already been closed, do nothing. */ |
root@mbed.org | 0:5e1631496985 | 185 | err = ERR_OK; |
root@mbed.org | 0:5e1631496985 | 186 | pcb = NULL; |
root@mbed.org | 0:5e1631496985 | 187 | break; |
root@mbed.org | 0:5e1631496985 | 188 | } |
root@mbed.org | 0:5e1631496985 | 189 | |
root@mbed.org | 0:5e1631496985 | 190 | if (pcb != NULL && err == ERR_OK) { |
root@mbed.org | 0:5e1631496985 | 191 | /* To ensure all data has been sent when tcp_close returns, we have |
root@mbed.org | 0:5e1631496985 | 192 | to make sure tcp_output doesn't fail. |
root@mbed.org | 0:5e1631496985 | 193 | Since we don't really have to ensure all data has been sent when tcp_close |
root@mbed.org | 0:5e1631496985 | 194 | returns (unsent data is sent from tcp timer functions, also), we don't care |
root@mbed.org | 0:5e1631496985 | 195 | for the return value of tcp_output for now. */ |
root@mbed.org | 0:5e1631496985 | 196 | /* @todo: When implementing SO_LINGER, this must be changed somehow: |
root@mbed.org | 0:5e1631496985 | 197 | If SOF_LINGER is set, the data should be sent when tcp_close returns. */ |
root@mbed.org | 0:5e1631496985 | 198 | tcp_output(pcb); |
root@mbed.org | 0:5e1631496985 | 199 | } |
root@mbed.org | 0:5e1631496985 | 200 | return err; |
root@mbed.org | 0:5e1631496985 | 201 | } |
root@mbed.org | 0:5e1631496985 | 202 | |
root@mbed.org | 0:5e1631496985 | 203 | /** |
root@mbed.org | 0:5e1631496985 | 204 | * Abandons a connection and optionally sends a RST to the remote |
root@mbed.org | 0:5e1631496985 | 205 | * host. Deletes the local protocol control block. This is done when |
root@mbed.org | 0:5e1631496985 | 206 | * a connection is killed because of shortage of memory. |
root@mbed.org | 0:5e1631496985 | 207 | * |
root@mbed.org | 0:5e1631496985 | 208 | * @param pcb the tcp_pcb to abort |
root@mbed.org | 0:5e1631496985 | 209 | * @param reset boolean to indicate whether a reset should be sent |
root@mbed.org | 0:5e1631496985 | 210 | */ |
root@mbed.org | 0:5e1631496985 | 211 | void |
root@mbed.org | 0:5e1631496985 | 212 | tcp_abandon(struct tcp_pcb *pcb, int reset) |
root@mbed.org | 0:5e1631496985 | 213 | { |
root@mbed.org | 0:5e1631496985 | 214 | u32_t seqno, ackno; |
root@mbed.org | 0:5e1631496985 | 215 | u16_t remote_port, local_port; |
root@mbed.org | 0:5e1631496985 | 216 | struct ip_addr remote_ip, local_ip; |
root@mbed.org | 0:5e1631496985 | 217 | #if LWIP_CALLBACK_API |
root@mbed.org | 0:5e1631496985 | 218 | void (* errf)(void *arg, err_t err); |
root@mbed.org | 0:5e1631496985 | 219 | #endif /* LWIP_CALLBACK_API */ |
root@mbed.org | 0:5e1631496985 | 220 | void *errf_arg; |
root@mbed.org | 0:5e1631496985 | 221 | |
root@mbed.org | 0:5e1631496985 | 222 | |
root@mbed.org | 0:5e1631496985 | 223 | /* Figure out on which TCP PCB list we are, and remove us. If we |
root@mbed.org | 0:5e1631496985 | 224 | are in an active state, call the receive function associated with |
root@mbed.org | 0:5e1631496985 | 225 | the PCB with a NULL argument, and send an RST to the remote end. */ |
root@mbed.org | 0:5e1631496985 | 226 | if (pcb->state == TIME_WAIT) { |
root@mbed.org | 0:5e1631496985 | 227 | tcp_pcb_remove(&tcp_tw_pcbs, pcb); |
root@mbed.org | 0:5e1631496985 | 228 | memp_free(MEMP_TCP_PCB, pcb); |
root@mbed.org | 0:5e1631496985 | 229 | } else { |
root@mbed.org | 0:5e1631496985 | 230 | seqno = pcb->snd_nxt; |
root@mbed.org | 0:5e1631496985 | 231 | ackno = pcb->rcv_nxt; |
root@mbed.org | 0:5e1631496985 | 232 | ip_addr_set(&local_ip, &(pcb->local_ip)); |
root@mbed.org | 0:5e1631496985 | 233 | ip_addr_set(&remote_ip, &(pcb->remote_ip)); |
root@mbed.org | 0:5e1631496985 | 234 | local_port = pcb->local_port; |
root@mbed.org | 0:5e1631496985 | 235 | remote_port = pcb->remote_port; |
root@mbed.org | 0:5e1631496985 | 236 | #if LWIP_CALLBACK_API |
root@mbed.org | 0:5e1631496985 | 237 | errf = pcb->errf; |
root@mbed.org | 0:5e1631496985 | 238 | #endif /* LWIP_CALLBACK_API */ |
root@mbed.org | 0:5e1631496985 | 239 | errf_arg = pcb->callback_arg; |
root@mbed.org | 0:5e1631496985 | 240 | tcp_pcb_remove(&tcp_active_pcbs, pcb); |
root@mbed.org | 0:5e1631496985 | 241 | if (pcb->unacked != NULL) { |
root@mbed.org | 0:5e1631496985 | 242 | tcp_segs_free(pcb->unacked); |
root@mbed.org | 0:5e1631496985 | 243 | } |
root@mbed.org | 0:5e1631496985 | 244 | if (pcb->unsent != NULL) { |
root@mbed.org | 0:5e1631496985 | 245 | tcp_segs_free(pcb->unsent); |
root@mbed.org | 0:5e1631496985 | 246 | } |
root@mbed.org | 0:5e1631496985 | 247 | #if TCP_QUEUE_OOSEQ |
root@mbed.org | 0:5e1631496985 | 248 | if (pcb->ooseq != NULL) { |
root@mbed.org | 0:5e1631496985 | 249 | tcp_segs_free(pcb->ooseq); |
root@mbed.org | 0:5e1631496985 | 250 | } |
root@mbed.org | 0:5e1631496985 | 251 | #endif /* TCP_QUEUE_OOSEQ */ |
root@mbed.org | 0:5e1631496985 | 252 | memp_free(MEMP_TCP_PCB, pcb); |
root@mbed.org | 0:5e1631496985 | 253 | TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT); |
root@mbed.org | 0:5e1631496985 | 254 | if (reset) { |
root@mbed.org | 0:5e1631496985 | 255 | LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n")); |
root@mbed.org | 0:5e1631496985 | 256 | tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port); |
root@mbed.org | 0:5e1631496985 | 257 | } |
root@mbed.org | 0:5e1631496985 | 258 | } |
root@mbed.org | 0:5e1631496985 | 259 | } |
root@mbed.org | 0:5e1631496985 | 260 | |
root@mbed.org | 0:5e1631496985 | 261 | /** |
root@mbed.org | 0:5e1631496985 | 262 | * Binds the connection to a local portnumber and IP address. If the |
root@mbed.org | 0:5e1631496985 | 263 | * IP address is not given (i.e., ipaddr == NULL), the IP address of |
root@mbed.org | 0:5e1631496985 | 264 | * the outgoing network interface is used instead. |
root@mbed.org | 0:5e1631496985 | 265 | * |
root@mbed.org | 0:5e1631496985 | 266 | * @param pcb the tcp_pcb to bind (no check is done whether this pcb is |
root@mbed.org | 0:5e1631496985 | 267 | * already bound!) |
root@mbed.org | 0:5e1631496985 | 268 | * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind |
root@mbed.org | 0:5e1631496985 | 269 | * to any local address |
root@mbed.org | 0:5e1631496985 | 270 | * @param port the local port to bind to |
root@mbed.org | 0:5e1631496985 | 271 | * @return ERR_USE if the port is already in use |
root@mbed.org | 0:5e1631496985 | 272 | * ERR_OK if bound |
root@mbed.org | 0:5e1631496985 | 273 | */ |
root@mbed.org | 0:5e1631496985 | 274 | err_t |
root@mbed.org | 0:5e1631496985 | 275 | tcp_bind(struct tcp_pcb *pcb, struct ip_addr *ipaddr, u16_t port) |
root@mbed.org | 0:5e1631496985 | 276 | { |
root@mbed.org | 0:5e1631496985 | 277 | struct tcp_pcb *cpcb; |
root@mbed.org | 0:5e1631496985 | 278 | |
root@mbed.org | 0:5e1631496985 | 279 | LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_ISCONN); |
root@mbed.org | 0:5e1631496985 | 280 | |
root@mbed.org | 0:5e1631496985 | 281 | if (port == 0) { |
root@mbed.org | 0:5e1631496985 | 282 | port = tcp_new_port(); |
root@mbed.org | 0:5e1631496985 | 283 | } |
root@mbed.org | 0:5e1631496985 | 284 | /* Check if the address already is in use. */ |
root@mbed.org | 0:5e1631496985 | 285 | /* Check the listen pcbs. */ |
root@mbed.org | 0:5e1631496985 | 286 | for(cpcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; |
root@mbed.org | 0:5e1631496985 | 287 | cpcb != NULL; cpcb = cpcb->next) { |
root@mbed.org | 0:5e1631496985 | 288 | if (cpcb->local_port == port) { |
root@mbed.org | 0:5e1631496985 | 289 | if (ip_addr_isany(&(cpcb->local_ip)) || |
root@mbed.org | 0:5e1631496985 | 290 | ip_addr_isany(ipaddr) || |
root@mbed.org | 0:5e1631496985 | 291 | ip_addr_cmp(&(cpcb->local_ip), ipaddr)) { |
root@mbed.org | 0:5e1631496985 | 292 | return ERR_USE; |
root@mbed.org | 0:5e1631496985 | 293 | } |
root@mbed.org | 0:5e1631496985 | 294 | } |
root@mbed.org | 0:5e1631496985 | 295 | } |
root@mbed.org | 0:5e1631496985 | 296 | /* Check the connected pcbs. */ |
root@mbed.org | 0:5e1631496985 | 297 | for(cpcb = tcp_active_pcbs; |
root@mbed.org | 0:5e1631496985 | 298 | cpcb != NULL; cpcb = cpcb->next) { |
root@mbed.org | 0:5e1631496985 | 299 | if (cpcb->local_port == port) { |
root@mbed.org | 0:5e1631496985 | 300 | if (ip_addr_isany(&(cpcb->local_ip)) || |
root@mbed.org | 0:5e1631496985 | 301 | ip_addr_isany(ipaddr) || |
root@mbed.org | 0:5e1631496985 | 302 | ip_addr_cmp(&(cpcb->local_ip), ipaddr)) { |
root@mbed.org | 0:5e1631496985 | 303 | return ERR_USE; |
root@mbed.org | 0:5e1631496985 | 304 | } |
root@mbed.org | 0:5e1631496985 | 305 | } |
root@mbed.org | 0:5e1631496985 | 306 | } |
root@mbed.org | 0:5e1631496985 | 307 | /* Check the bound, not yet connected pcbs. */ |
root@mbed.org | 0:5e1631496985 | 308 | for(cpcb = tcp_bound_pcbs; cpcb != NULL; cpcb = cpcb->next) { |
root@mbed.org | 0:5e1631496985 | 309 | if (cpcb->local_port == port) { |
root@mbed.org | 0:5e1631496985 | 310 | if (ip_addr_isany(&(cpcb->local_ip)) || |
root@mbed.org | 0:5e1631496985 | 311 | ip_addr_isany(ipaddr) || |
root@mbed.org | 0:5e1631496985 | 312 | ip_addr_cmp(&(cpcb->local_ip), ipaddr)) { |
root@mbed.org | 0:5e1631496985 | 313 | return ERR_USE; |
root@mbed.org | 0:5e1631496985 | 314 | } |
root@mbed.org | 0:5e1631496985 | 315 | } |
root@mbed.org | 0:5e1631496985 | 316 | } |
root@mbed.org | 0:5e1631496985 | 317 | /* @todo: until SO_REUSEADDR is implemented (see task #6995 on savannah), |
root@mbed.org | 0:5e1631496985 | 318 | * we have to check the pcbs in TIME-WAIT state, also: */ |
root@mbed.org | 0:5e1631496985 | 319 | for(cpcb = tcp_tw_pcbs; cpcb != NULL; cpcb = cpcb->next) { |
root@mbed.org | 0:5e1631496985 | 320 | if (cpcb->local_port == port) { |
root@mbed.org | 0:5e1631496985 | 321 | if (ip_addr_cmp(&(cpcb->local_ip), ipaddr)) { |
root@mbed.org | 0:5e1631496985 | 322 | return ERR_USE; |
root@mbed.org | 0:5e1631496985 | 323 | } |
root@mbed.org | 0:5e1631496985 | 324 | } |
root@mbed.org | 0:5e1631496985 | 325 | } |
root@mbed.org | 0:5e1631496985 | 326 | |
root@mbed.org | 0:5e1631496985 | 327 | if (!ip_addr_isany(ipaddr)) { |
root@mbed.org | 0:5e1631496985 | 328 | pcb->local_ip = *ipaddr; |
root@mbed.org | 0:5e1631496985 | 329 | } |
root@mbed.org | 0:5e1631496985 | 330 | pcb->local_port = port; |
root@mbed.org | 0:5e1631496985 | 331 | TCP_REG(&tcp_bound_pcbs, pcb); |
root@mbed.org | 0:5e1631496985 | 332 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port)); |
root@mbed.org | 0:5e1631496985 | 333 | return ERR_OK; |
root@mbed.org | 0:5e1631496985 | 334 | } |
root@mbed.org | 0:5e1631496985 | 335 | #if LWIP_CALLBACK_API |
root@mbed.org | 0:5e1631496985 | 336 | /** |
root@mbed.org | 0:5e1631496985 | 337 | * Default accept callback if no accept callback is specified by the user. |
root@mbed.org | 0:5e1631496985 | 338 | */ |
root@mbed.org | 0:5e1631496985 | 339 | static err_t |
root@mbed.org | 0:5e1631496985 | 340 | tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err) |
root@mbed.org | 0:5e1631496985 | 341 | { |
root@mbed.org | 0:5e1631496985 | 342 | LWIP_UNUSED_ARG(arg); |
root@mbed.org | 0:5e1631496985 | 343 | LWIP_UNUSED_ARG(pcb); |
root@mbed.org | 0:5e1631496985 | 344 | LWIP_UNUSED_ARG(err); |
root@mbed.org | 0:5e1631496985 | 345 | |
root@mbed.org | 0:5e1631496985 | 346 | return ERR_ABRT; |
root@mbed.org | 0:5e1631496985 | 347 | } |
root@mbed.org | 0:5e1631496985 | 348 | #endif /* LWIP_CALLBACK_API */ |
root@mbed.org | 0:5e1631496985 | 349 | |
root@mbed.org | 0:5e1631496985 | 350 | /** |
root@mbed.org | 0:5e1631496985 | 351 | * Set the state of the connection to be LISTEN, which means that it |
root@mbed.org | 0:5e1631496985 | 352 | * is able to accept incoming connections. The protocol control block |
root@mbed.org | 0:5e1631496985 | 353 | * is reallocated in order to consume less memory. Setting the |
root@mbed.org | 0:5e1631496985 | 354 | * connection to LISTEN is an irreversible process. |
root@mbed.org | 0:5e1631496985 | 355 | * |
root@mbed.org | 0:5e1631496985 | 356 | * @param pcb the original tcp_pcb |
root@mbed.org | 0:5e1631496985 | 357 | * @param backlog the incoming connections queue limit |
root@mbed.org | 0:5e1631496985 | 358 | * @return tcp_pcb used for listening, consumes less memory. |
root@mbed.org | 0:5e1631496985 | 359 | * |
root@mbed.org | 0:5e1631496985 | 360 | * @note The original tcp_pcb is freed. This function therefore has to be |
root@mbed.org | 0:5e1631496985 | 361 | * called like this: |
root@mbed.org | 0:5e1631496985 | 362 | * tpcb = tcp_listen(tpcb); |
root@mbed.org | 0:5e1631496985 | 363 | */ |
root@mbed.org | 0:5e1631496985 | 364 | struct tcp_pcb * |
root@mbed.org | 0:5e1631496985 | 365 | tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog) |
root@mbed.org | 0:5e1631496985 | 366 | { |
root@mbed.org | 0:5e1631496985 | 367 | struct tcp_pcb_listen *lpcb; |
root@mbed.org | 0:5e1631496985 | 368 | |
root@mbed.org | 0:5e1631496985 | 369 | LWIP_UNUSED_ARG(backlog); |
root@mbed.org | 0:5e1631496985 | 370 | LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL); |
root@mbed.org | 0:5e1631496985 | 371 | |
root@mbed.org | 0:5e1631496985 | 372 | /* already listening? */ |
root@mbed.org | 0:5e1631496985 | 373 | if (pcb->state == LISTEN) { |
root@mbed.org | 0:5e1631496985 | 374 | return pcb; |
root@mbed.org | 0:5e1631496985 | 375 | } |
root@mbed.org | 0:5e1631496985 | 376 | lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN); |
root@mbed.org | 0:5e1631496985 | 377 | if (lpcb == NULL) { |
root@mbed.org | 0:5e1631496985 | 378 | return NULL; |
root@mbed.org | 0:5e1631496985 | 379 | } |
root@mbed.org | 0:5e1631496985 | 380 | lpcb->callback_arg = pcb->callback_arg; |
root@mbed.org | 0:5e1631496985 | 381 | lpcb->local_port = pcb->local_port; |
root@mbed.org | 0:5e1631496985 | 382 | lpcb->state = LISTEN; |
root@mbed.org | 0:5e1631496985 | 383 | lpcb->so_options = pcb->so_options; |
root@mbed.org | 0:5e1631496985 | 384 | lpcb->so_options |= SOF_ACCEPTCONN; |
root@mbed.org | 0:5e1631496985 | 385 | lpcb->ttl = pcb->ttl; |
root@mbed.org | 0:5e1631496985 | 386 | lpcb->tos = pcb->tos; |
root@mbed.org | 0:5e1631496985 | 387 | ip_addr_set(&lpcb->local_ip, &pcb->local_ip); |
root@mbed.org | 0:5e1631496985 | 388 | TCP_RMV(&tcp_bound_pcbs, pcb); |
root@mbed.org | 0:5e1631496985 | 389 | memp_free(MEMP_TCP_PCB, pcb); |
root@mbed.org | 0:5e1631496985 | 390 | #if LWIP_CALLBACK_API |
root@mbed.org | 0:5e1631496985 | 391 | lpcb->accept = tcp_accept_null; |
root@mbed.org | 0:5e1631496985 | 392 | #endif /* LWIP_CALLBACK_API */ |
root@mbed.org | 0:5e1631496985 | 393 | #if TCP_LISTEN_BACKLOG |
root@mbed.org | 0:5e1631496985 | 394 | lpcb->accepts_pending = 0; |
root@mbed.org | 0:5e1631496985 | 395 | lpcb->backlog = (backlog ? backlog : 1); |
root@mbed.org | 0:5e1631496985 | 396 | #endif /* TCP_LISTEN_BACKLOG */ |
root@mbed.org | 0:5e1631496985 | 397 | TCP_REG(&tcp_listen_pcbs.listen_pcbs, lpcb); |
root@mbed.org | 0:5e1631496985 | 398 | return (struct tcp_pcb *)lpcb; |
root@mbed.org | 0:5e1631496985 | 399 | } |
root@mbed.org | 0:5e1631496985 | 400 | |
root@mbed.org | 0:5e1631496985 | 401 | /** |
root@mbed.org | 0:5e1631496985 | 402 | * Update the state that tracks the available window space to advertise. |
root@mbed.org | 0:5e1631496985 | 403 | * |
root@mbed.org | 0:5e1631496985 | 404 | * Returns how much extra window would be advertised if we sent an |
root@mbed.org | 0:5e1631496985 | 405 | * update now. |
root@mbed.org | 0:5e1631496985 | 406 | */ |
root@mbed.org | 0:5e1631496985 | 407 | u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb) |
root@mbed.org | 0:5e1631496985 | 408 | { |
root@mbed.org | 0:5e1631496985 | 409 | u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd; |
root@mbed.org | 0:5e1631496985 | 410 | |
root@mbed.org | 0:5e1631496985 | 411 | if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) { |
root@mbed.org | 0:5e1631496985 | 412 | /* we can advertise more window */ |
root@mbed.org | 0:5e1631496985 | 413 | pcb->rcv_ann_wnd = pcb->rcv_wnd; |
root@mbed.org | 0:5e1631496985 | 414 | return new_right_edge - pcb->rcv_ann_right_edge; |
root@mbed.org | 0:5e1631496985 | 415 | } else { |
root@mbed.org | 0:5e1631496985 | 416 | if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) { |
root@mbed.org | 0:5e1631496985 | 417 | /* Can happen due to other end sending out of advertised window, |
root@mbed.org | 0:5e1631496985 | 418 | * but within actual available (but not yet advertised) window */ |
root@mbed.org | 0:5e1631496985 | 419 | pcb->rcv_ann_wnd = 0; |
root@mbed.org | 0:5e1631496985 | 420 | } else { |
root@mbed.org | 0:5e1631496985 | 421 | /* keep the right edge of window constant */ |
root@mbed.org | 0:5e1631496985 | 422 | pcb->rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt; |
root@mbed.org | 0:5e1631496985 | 423 | } |
root@mbed.org | 0:5e1631496985 | 424 | return 0; |
root@mbed.org | 0:5e1631496985 | 425 | } |
root@mbed.org | 0:5e1631496985 | 426 | } |
root@mbed.org | 0:5e1631496985 | 427 | |
root@mbed.org | 0:5e1631496985 | 428 | /** |
root@mbed.org | 0:5e1631496985 | 429 | * This function should be called by the application when it has |
root@mbed.org | 0:5e1631496985 | 430 | * processed the data. The purpose is to advertise a larger window |
root@mbed.org | 0:5e1631496985 | 431 | * when the data has been processed. |
root@mbed.org | 0:5e1631496985 | 432 | * |
root@mbed.org | 0:5e1631496985 | 433 | * @param pcb the tcp_pcb for which data is read |
root@mbed.org | 0:5e1631496985 | 434 | * @param len the amount of bytes that have been read by the application |
root@mbed.org | 0:5e1631496985 | 435 | */ |
root@mbed.org | 0:5e1631496985 | 436 | void |
root@mbed.org | 0:5e1631496985 | 437 | tcp_recved(struct tcp_pcb *pcb, u16_t len) |
root@mbed.org | 0:5e1631496985 | 438 | { |
root@mbed.org | 0:5e1631496985 | 439 | int wnd_inflation; |
root@mbed.org | 0:5e1631496985 | 440 | |
root@mbed.org | 0:5e1631496985 | 441 | LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n", |
root@mbed.org | 0:5e1631496985 | 442 | len <= 0xffff - pcb->rcv_wnd ); |
root@mbed.org | 0:5e1631496985 | 443 | |
root@mbed.org | 0:5e1631496985 | 444 | pcb->rcv_wnd += len; |
root@mbed.org | 0:5e1631496985 | 445 | if (pcb->rcv_wnd > TCP_WND) |
root@mbed.org | 0:5e1631496985 | 446 | pcb->rcv_wnd = TCP_WND; |
root@mbed.org | 0:5e1631496985 | 447 | |
root@mbed.org | 0:5e1631496985 | 448 | wnd_inflation = tcp_update_rcv_ann_wnd(pcb); |
root@mbed.org | 0:5e1631496985 | 449 | |
root@mbed.org | 0:5e1631496985 | 450 | /* If the change in the right edge of window is significant (default |
root@mbed.org | 0:5e1631496985 | 451 | * watermark is TCP_WND/2), then send an explicit update now. |
root@mbed.org | 0:5e1631496985 | 452 | * Otherwise wait for a packet to be sent in the normal course of |
root@mbed.org | 0:5e1631496985 | 453 | * events (or more window to be available later) */ |
root@mbed.org | 0:5e1631496985 | 454 | if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) |
root@mbed.org | 0:5e1631496985 | 455 | tcp_ack_now(pcb); |
root@mbed.org | 0:5e1631496985 | 456 | |
root@mbed.org | 0:5e1631496985 | 457 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n", |
root@mbed.org | 0:5e1631496985 | 458 | len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd)); |
root@mbed.org | 0:5e1631496985 | 459 | } |
root@mbed.org | 0:5e1631496985 | 460 | |
root@mbed.org | 0:5e1631496985 | 461 | /** |
root@mbed.org | 0:5e1631496985 | 462 | * A nastly hack featuring 'goto' statements that allocates a |
root@mbed.org | 0:5e1631496985 | 463 | * new TCP local port. |
root@mbed.org | 0:5e1631496985 | 464 | * |
root@mbed.org | 0:5e1631496985 | 465 | * @return a new (free) local TCP port number |
root@mbed.org | 0:5e1631496985 | 466 | */ |
root@mbed.org | 0:5e1631496985 | 467 | static u16_t |
root@mbed.org | 0:5e1631496985 | 468 | tcp_new_port(void) |
root@mbed.org | 0:5e1631496985 | 469 | { |
root@mbed.org | 0:5e1631496985 | 470 | struct tcp_pcb *pcb; |
root@mbed.org | 0:5e1631496985 | 471 | #ifndef TCP_LOCAL_PORT_RANGE_START |
root@mbed.org | 0:5e1631496985 | 472 | #define TCP_LOCAL_PORT_RANGE_START 4096 |
root@mbed.org | 0:5e1631496985 | 473 | #define TCP_LOCAL_PORT_RANGE_END 0x7fff |
root@mbed.org | 0:5e1631496985 | 474 | #endif |
root@mbed.org | 0:5e1631496985 | 475 | static u16_t port = TCP_LOCAL_PORT_RANGE_START; |
root@mbed.org | 0:5e1631496985 | 476 | |
root@mbed.org | 0:5e1631496985 | 477 | again: |
root@mbed.org | 0:5e1631496985 | 478 | if (++port > TCP_LOCAL_PORT_RANGE_END) { |
root@mbed.org | 0:5e1631496985 | 479 | port = TCP_LOCAL_PORT_RANGE_START; |
root@mbed.org | 0:5e1631496985 | 480 | } |
root@mbed.org | 0:5e1631496985 | 481 | |
root@mbed.org | 0:5e1631496985 | 482 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 483 | if (pcb->local_port == port) { |
root@mbed.org | 0:5e1631496985 | 484 | goto again; |
root@mbed.org | 0:5e1631496985 | 485 | } |
root@mbed.org | 0:5e1631496985 | 486 | } |
root@mbed.org | 0:5e1631496985 | 487 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 488 | if (pcb->local_port == port) { |
root@mbed.org | 0:5e1631496985 | 489 | goto again; |
root@mbed.org | 0:5e1631496985 | 490 | } |
root@mbed.org | 0:5e1631496985 | 491 | } |
root@mbed.org | 0:5e1631496985 | 492 | for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 493 | if (pcb->local_port == port) { |
root@mbed.org | 0:5e1631496985 | 494 | goto again; |
root@mbed.org | 0:5e1631496985 | 495 | } |
root@mbed.org | 0:5e1631496985 | 496 | } |
root@mbed.org | 0:5e1631496985 | 497 | return port; |
root@mbed.org | 0:5e1631496985 | 498 | } |
root@mbed.org | 0:5e1631496985 | 499 | |
root@mbed.org | 0:5e1631496985 | 500 | /** |
root@mbed.org | 0:5e1631496985 | 501 | * Connects to another host. The function given as the "connected" |
root@mbed.org | 0:5e1631496985 | 502 | * argument will be called when the connection has been established. |
root@mbed.org | 0:5e1631496985 | 503 | * |
root@mbed.org | 0:5e1631496985 | 504 | * @param pcb the tcp_pcb used to establish the connection |
root@mbed.org | 0:5e1631496985 | 505 | * @param ipaddr the remote ip address to connect to |
root@mbed.org | 0:5e1631496985 | 506 | * @param port the remote tcp port to connect to |
root@mbed.org | 0:5e1631496985 | 507 | * @param connected callback function to call when connected (or on error) |
root@mbed.org | 0:5e1631496985 | 508 | * @return ERR_VAL if invalid arguments are given |
root@mbed.org | 0:5e1631496985 | 509 | * ERR_OK if connect request has been sent |
root@mbed.org | 0:5e1631496985 | 510 | * other err_t values if connect request couldn't be sent |
root@mbed.org | 0:5e1631496985 | 511 | */ |
root@mbed.org | 0:5e1631496985 | 512 | err_t |
root@mbed.org | 0:5e1631496985 | 513 | tcp_connect(struct tcp_pcb *pcb, struct ip_addr *ipaddr, u16_t port, |
root@mbed.org | 0:5e1631496985 | 514 | err_t (* connected)(void *arg, struct tcp_pcb *tpcb, err_t err)) |
root@mbed.org | 0:5e1631496985 | 515 | { |
root@mbed.org | 0:5e1631496985 | 516 | err_t ret; |
root@mbed.org | 0:5e1631496985 | 517 | u32_t iss; |
root@mbed.org | 0:5e1631496985 | 518 | |
root@mbed.org | 0:5e1631496985 | 519 | LWIP_ERROR("tcp_connect: can only connected from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN); |
root@mbed.org | 0:5e1631496985 | 520 | |
root@mbed.org | 0:5e1631496985 | 521 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port)); |
root@mbed.org | 0:5e1631496985 | 522 | if (ipaddr != NULL) { |
root@mbed.org | 0:5e1631496985 | 523 | pcb->remote_ip = *ipaddr; |
root@mbed.org | 0:5e1631496985 | 524 | } else { |
root@mbed.org | 0:5e1631496985 | 525 | return ERR_VAL; |
root@mbed.org | 0:5e1631496985 | 526 | } |
root@mbed.org | 0:5e1631496985 | 527 | pcb->remote_port = port; |
root@mbed.org | 0:5e1631496985 | 528 | if (pcb->local_port == 0) { |
root@mbed.org | 0:5e1631496985 | 529 | pcb->local_port = tcp_new_port(); |
root@mbed.org | 0:5e1631496985 | 530 | } |
root@mbed.org | 0:5e1631496985 | 531 | iss = tcp_next_iss(); |
root@mbed.org | 0:5e1631496985 | 532 | pcb->rcv_nxt = 0; |
root@mbed.org | 0:5e1631496985 | 533 | pcb->snd_nxt = iss; |
root@mbed.org | 0:5e1631496985 | 534 | pcb->lastack = iss - 1; |
root@mbed.org | 0:5e1631496985 | 535 | pcb->snd_lbb = iss - 1; |
root@mbed.org | 0:5e1631496985 | 536 | pcb->rcv_wnd = TCP_WND; |
root@mbed.org | 0:5e1631496985 | 537 | pcb->rcv_ann_wnd = TCP_WND; |
root@mbed.org | 0:5e1631496985 | 538 | pcb->rcv_ann_right_edge = pcb->rcv_nxt; |
root@mbed.org | 0:5e1631496985 | 539 | pcb->snd_wnd = TCP_WND; |
root@mbed.org | 0:5e1631496985 | 540 | /* As initial send MSS, we use TCP_MSS but limit it to 536. |
root@mbed.org | 0:5e1631496985 | 541 | The send MSS is updated when an MSS option is received. */ |
root@mbed.org | 0:5e1631496985 | 542 | pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS; |
root@mbed.org | 0:5e1631496985 | 543 | #if TCP_CALCULATE_EFF_SEND_MSS |
root@mbed.org | 0:5e1631496985 | 544 | pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr); |
root@mbed.org | 0:5e1631496985 | 545 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */ |
root@mbed.org | 0:5e1631496985 | 546 | pcb->cwnd = 1; |
root@mbed.org | 0:5e1631496985 | 547 | pcb->ssthresh = pcb->mss * 10; |
root@mbed.org | 0:5e1631496985 | 548 | pcb->state = SYN_SENT; |
root@mbed.org | 0:5e1631496985 | 549 | #if LWIP_CALLBACK_API |
root@mbed.org | 0:5e1631496985 | 550 | pcb->connected = connected; |
root@mbed.org | 0:5e1631496985 | 551 | #endif /* LWIP_CALLBACK_API */ |
root@mbed.org | 0:5e1631496985 | 552 | TCP_RMV(&tcp_bound_pcbs, pcb); |
root@mbed.org | 0:5e1631496985 | 553 | TCP_REG(&tcp_active_pcbs, pcb); |
root@mbed.org | 0:5e1631496985 | 554 | |
root@mbed.org | 0:5e1631496985 | 555 | snmp_inc_tcpactiveopens(); |
root@mbed.org | 0:5e1631496985 | 556 | |
root@mbed.org | 0:5e1631496985 | 557 | ret = tcp_enqueue(pcb, NULL, 0, TCP_SYN, 0, TF_SEG_OPTS_MSS |
root@mbed.org | 0:5e1631496985 | 558 | #if LWIP_TCP_TIMESTAMPS |
root@mbed.org | 0:5e1631496985 | 559 | | TF_SEG_OPTS_TS |
root@mbed.org | 0:5e1631496985 | 560 | #endif |
root@mbed.org | 0:5e1631496985 | 561 | ); |
root@mbed.org | 0:5e1631496985 | 562 | if (ret == ERR_OK) { |
root@mbed.org | 0:5e1631496985 | 563 | tcp_output(pcb); |
root@mbed.org | 0:5e1631496985 | 564 | } |
root@mbed.org | 0:5e1631496985 | 565 | return ret; |
root@mbed.org | 0:5e1631496985 | 566 | } |
root@mbed.org | 0:5e1631496985 | 567 | |
root@mbed.org | 0:5e1631496985 | 568 | /** |
root@mbed.org | 0:5e1631496985 | 569 | * Called every 500 ms and implements the retransmission timer and the timer that |
root@mbed.org | 0:5e1631496985 | 570 | * removes PCBs that have been in TIME-WAIT for enough time. It also increments |
root@mbed.org | 0:5e1631496985 | 571 | * various timers such as the inactivity timer in each PCB. |
root@mbed.org | 0:5e1631496985 | 572 | * |
root@mbed.org | 0:5e1631496985 | 573 | * Automatically called from tcp_tmr(). |
root@mbed.org | 0:5e1631496985 | 574 | */ |
root@mbed.org | 0:5e1631496985 | 575 | void |
root@mbed.org | 0:5e1631496985 | 576 | tcp_slowtmr(void) |
root@mbed.org | 0:5e1631496985 | 577 | { |
root@mbed.org | 0:5e1631496985 | 578 | struct tcp_pcb *pcb, *pcb2, *prev; |
root@mbed.org | 0:5e1631496985 | 579 | u16_t eff_wnd; |
root@mbed.org | 0:5e1631496985 | 580 | u8_t pcb_remove; /* flag if a PCB should be removed */ |
root@mbed.org | 0:5e1631496985 | 581 | err_t err; |
root@mbed.org | 0:5e1631496985 | 582 | |
root@mbed.org | 0:5e1631496985 | 583 | err = ERR_OK; |
root@mbed.org | 0:5e1631496985 | 584 | |
root@mbed.org | 0:5e1631496985 | 585 | ++tcp_ticks; |
root@mbed.org | 0:5e1631496985 | 586 | |
root@mbed.org | 0:5e1631496985 | 587 | /* Steps through all of the active PCBs. */ |
root@mbed.org | 0:5e1631496985 | 588 | prev = NULL; |
root@mbed.org | 0:5e1631496985 | 589 | pcb = tcp_active_pcbs; |
root@mbed.org | 0:5e1631496985 | 590 | if (pcb == NULL) { |
root@mbed.org | 0:5e1631496985 | 591 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n")); |
root@mbed.org | 0:5e1631496985 | 592 | } |
root@mbed.org | 0:5e1631496985 | 593 | while (pcb != NULL) { |
root@mbed.org | 0:5e1631496985 | 594 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n")); |
root@mbed.org | 0:5e1631496985 | 595 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED); |
root@mbed.org | 0:5e1631496985 | 596 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN); |
root@mbed.org | 0:5e1631496985 | 597 | LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT); |
root@mbed.org | 0:5e1631496985 | 598 | |
root@mbed.org | 0:5e1631496985 | 599 | pcb_remove = 0; |
root@mbed.org | 0:5e1631496985 | 600 | |
root@mbed.org | 0:5e1631496985 | 601 | if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) { |
root@mbed.org | 0:5e1631496985 | 602 | ++pcb_remove; |
root@mbed.org | 0:5e1631496985 | 603 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n")); |
root@mbed.org | 0:5e1631496985 | 604 | } |
root@mbed.org | 0:5e1631496985 | 605 | else if (pcb->nrtx == TCP_MAXRTX) { |
root@mbed.org | 0:5e1631496985 | 606 | ++pcb_remove; |
root@mbed.org | 0:5e1631496985 | 607 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n")); |
root@mbed.org | 0:5e1631496985 | 608 | } else { |
root@mbed.org | 0:5e1631496985 | 609 | if (pcb->persist_backoff > 0) { |
root@mbed.org | 0:5e1631496985 | 610 | /* If snd_wnd is zero, use persist timer to send 1 byte probes |
root@mbed.org | 0:5e1631496985 | 611 | * instead of using the standard retransmission mechanism. */ |
root@mbed.org | 0:5e1631496985 | 612 | pcb->persist_cnt++; |
root@mbed.org | 0:5e1631496985 | 613 | if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) { |
root@mbed.org | 0:5e1631496985 | 614 | pcb->persist_cnt = 0; |
root@mbed.org | 0:5e1631496985 | 615 | if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) { |
root@mbed.org | 0:5e1631496985 | 616 | pcb->persist_backoff++; |
root@mbed.org | 0:5e1631496985 | 617 | } |
root@mbed.org | 0:5e1631496985 | 618 | tcp_zero_window_probe(pcb); |
root@mbed.org | 0:5e1631496985 | 619 | } |
root@mbed.org | 0:5e1631496985 | 620 | } else { |
root@mbed.org | 0:5e1631496985 | 621 | /* Increase the retransmission timer if it is running */ |
root@mbed.org | 0:5e1631496985 | 622 | if(pcb->rtime >= 0) |
root@mbed.org | 0:5e1631496985 | 623 | ++pcb->rtime; |
root@mbed.org | 0:5e1631496985 | 624 | |
root@mbed.org | 0:5e1631496985 | 625 | if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) { |
root@mbed.org | 0:5e1631496985 | 626 | /* Time for a retransmission. */ |
root@mbed.org | 0:5e1631496985 | 627 | LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F |
root@mbed.org | 0:5e1631496985 | 628 | " pcb->rto %"S16_F"\n", |
root@mbed.org | 0:5e1631496985 | 629 | pcb->rtime, pcb->rto)); |
root@mbed.org | 0:5e1631496985 | 630 | |
root@mbed.org | 0:5e1631496985 | 631 | /* Double retransmission time-out unless we are trying to |
root@mbed.org | 0:5e1631496985 | 632 | * connect to somebody (i.e., we are in SYN_SENT). */ |
root@mbed.org | 0:5e1631496985 | 633 | if (pcb->state != SYN_SENT) { |
root@mbed.org | 0:5e1631496985 | 634 | pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx]; |
root@mbed.org | 0:5e1631496985 | 635 | } |
root@mbed.org | 0:5e1631496985 | 636 | |
root@mbed.org | 0:5e1631496985 | 637 | /* Reset the retransmission timer. */ |
root@mbed.org | 0:5e1631496985 | 638 | pcb->rtime = 0; |
root@mbed.org | 0:5e1631496985 | 639 | |
root@mbed.org | 0:5e1631496985 | 640 | /* Reduce congestion window and ssthresh. */ |
root@mbed.org | 0:5e1631496985 | 641 | eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd); |
root@mbed.org | 0:5e1631496985 | 642 | pcb->ssthresh = eff_wnd >> 1; |
root@mbed.org | 0:5e1631496985 | 643 | if (pcb->ssthresh < pcb->mss) { |
root@mbed.org | 0:5e1631496985 | 644 | pcb->ssthresh = pcb->mss * 2; |
root@mbed.org | 0:5e1631496985 | 645 | } |
root@mbed.org | 0:5e1631496985 | 646 | pcb->cwnd = pcb->mss; |
root@mbed.org | 0:5e1631496985 | 647 | LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F |
root@mbed.org | 0:5e1631496985 | 648 | " ssthresh %"U16_F"\n", |
root@mbed.org | 0:5e1631496985 | 649 | pcb->cwnd, pcb->ssthresh)); |
root@mbed.org | 0:5e1631496985 | 650 | |
root@mbed.org | 0:5e1631496985 | 651 | /* The following needs to be called AFTER cwnd is set to one |
root@mbed.org | 0:5e1631496985 | 652 | mss - STJ */ |
root@mbed.org | 0:5e1631496985 | 653 | tcp_rexmit_rto(pcb); |
root@mbed.org | 0:5e1631496985 | 654 | } |
root@mbed.org | 0:5e1631496985 | 655 | } |
root@mbed.org | 0:5e1631496985 | 656 | } |
root@mbed.org | 0:5e1631496985 | 657 | /* Check if this PCB has stayed too long in FIN-WAIT-2 */ |
root@mbed.org | 0:5e1631496985 | 658 | if (pcb->state == FIN_WAIT_2) { |
root@mbed.org | 0:5e1631496985 | 659 | if ((u32_t)(tcp_ticks - pcb->tmr) > |
root@mbed.org | 0:5e1631496985 | 660 | TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) { |
root@mbed.org | 0:5e1631496985 | 661 | ++pcb_remove; |
root@mbed.org | 0:5e1631496985 | 662 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n")); |
root@mbed.org | 0:5e1631496985 | 663 | } |
root@mbed.org | 0:5e1631496985 | 664 | } |
root@mbed.org | 0:5e1631496985 | 665 | |
root@mbed.org | 0:5e1631496985 | 666 | /* Check if KEEPALIVE should be sent */ |
root@mbed.org | 0:5e1631496985 | 667 | if((pcb->so_options & SOF_KEEPALIVE) && |
root@mbed.org | 0:5e1631496985 | 668 | ((pcb->state == ESTABLISHED) || |
root@mbed.org | 0:5e1631496985 | 669 | (pcb->state == CLOSE_WAIT))) { |
root@mbed.org | 0:5e1631496985 | 670 | #if LWIP_TCP_KEEPALIVE |
root@mbed.org | 0:5e1631496985 | 671 | if((u32_t)(tcp_ticks - pcb->tmr) > |
root@mbed.org | 0:5e1631496985 | 672 | (pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl)) |
root@mbed.org | 0:5e1631496985 | 673 | / TCP_SLOW_INTERVAL) |
root@mbed.org | 0:5e1631496985 | 674 | #else |
root@mbed.org | 0:5e1631496985 | 675 | if((u32_t)(tcp_ticks - pcb->tmr) > |
root@mbed.org | 0:5e1631496985 | 676 | (pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL) |
root@mbed.org | 0:5e1631496985 | 677 | #endif /* LWIP_TCP_KEEPALIVE */ |
root@mbed.org | 0:5e1631496985 | 678 | { |
root@mbed.org | 0:5e1631496985 | 679 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n", |
root@mbed.org | 0:5e1631496985 | 680 | ip4_addr1(&pcb->remote_ip), ip4_addr2(&pcb->remote_ip), |
root@mbed.org | 0:5e1631496985 | 681 | ip4_addr3(&pcb->remote_ip), ip4_addr4(&pcb->remote_ip))); |
root@mbed.org | 0:5e1631496985 | 682 | |
root@mbed.org | 0:5e1631496985 | 683 | tcp_abort(pcb); |
root@mbed.org | 0:5e1631496985 | 684 | } |
root@mbed.org | 0:5e1631496985 | 685 | #if LWIP_TCP_KEEPALIVE |
root@mbed.org | 0:5e1631496985 | 686 | else if((u32_t)(tcp_ticks - pcb->tmr) > |
root@mbed.org | 0:5e1631496985 | 687 | (pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl) |
root@mbed.org | 0:5e1631496985 | 688 | / TCP_SLOW_INTERVAL) |
root@mbed.org | 0:5e1631496985 | 689 | #else |
root@mbed.org | 0:5e1631496985 | 690 | else if((u32_t)(tcp_ticks - pcb->tmr) > |
root@mbed.org | 0:5e1631496985 | 691 | (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT) |
root@mbed.org | 0:5e1631496985 | 692 | / TCP_SLOW_INTERVAL) |
root@mbed.org | 0:5e1631496985 | 693 | #endif /* LWIP_TCP_KEEPALIVE */ |
root@mbed.org | 0:5e1631496985 | 694 | { |
root@mbed.org | 0:5e1631496985 | 695 | tcp_keepalive(pcb); |
root@mbed.org | 0:5e1631496985 | 696 | pcb->keep_cnt_sent++; |
root@mbed.org | 0:5e1631496985 | 697 | } |
root@mbed.org | 0:5e1631496985 | 698 | } |
root@mbed.org | 0:5e1631496985 | 699 | |
root@mbed.org | 0:5e1631496985 | 700 | /* If this PCB has queued out of sequence data, but has been |
root@mbed.org | 0:5e1631496985 | 701 | inactive for too long, will drop the data (it will eventually |
root@mbed.org | 0:5e1631496985 | 702 | be retransmitted). */ |
root@mbed.org | 0:5e1631496985 | 703 | #if TCP_QUEUE_OOSEQ |
root@mbed.org | 0:5e1631496985 | 704 | if (pcb->ooseq != NULL && |
root@mbed.org | 0:5e1631496985 | 705 | (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) { |
root@mbed.org | 0:5e1631496985 | 706 | tcp_segs_free(pcb->ooseq); |
root@mbed.org | 0:5e1631496985 | 707 | pcb->ooseq = NULL; |
root@mbed.org | 0:5e1631496985 | 708 | LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n")); |
root@mbed.org | 0:5e1631496985 | 709 | } |
root@mbed.org | 0:5e1631496985 | 710 | #endif /* TCP_QUEUE_OOSEQ */ |
root@mbed.org | 0:5e1631496985 | 711 | |
root@mbed.org | 0:5e1631496985 | 712 | /* Check if this PCB has stayed too long in SYN-RCVD */ |
root@mbed.org | 0:5e1631496985 | 713 | if (pcb->state == SYN_RCVD) { |
root@mbed.org | 0:5e1631496985 | 714 | if ((u32_t)(tcp_ticks - pcb->tmr) > |
root@mbed.org | 0:5e1631496985 | 715 | TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) { |
root@mbed.org | 0:5e1631496985 | 716 | ++pcb_remove; |
root@mbed.org | 0:5e1631496985 | 717 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n")); |
root@mbed.org | 0:5e1631496985 | 718 | } |
root@mbed.org | 0:5e1631496985 | 719 | } |
root@mbed.org | 0:5e1631496985 | 720 | |
root@mbed.org | 0:5e1631496985 | 721 | /* Check if this PCB has stayed too long in LAST-ACK */ |
root@mbed.org | 0:5e1631496985 | 722 | if (pcb->state == LAST_ACK) { |
root@mbed.org | 0:5e1631496985 | 723 | if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) { |
root@mbed.org | 0:5e1631496985 | 724 | ++pcb_remove; |
root@mbed.org | 0:5e1631496985 | 725 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n")); |
root@mbed.org | 0:5e1631496985 | 726 | } |
root@mbed.org | 0:5e1631496985 | 727 | } |
root@mbed.org | 0:5e1631496985 | 728 | |
root@mbed.org | 0:5e1631496985 | 729 | /* If the PCB should be removed, do it. */ |
root@mbed.org | 0:5e1631496985 | 730 | if (pcb_remove) { |
root@mbed.org | 0:5e1631496985 | 731 | tcp_pcb_purge(pcb); |
root@mbed.org | 0:5e1631496985 | 732 | /* Remove PCB from tcp_active_pcbs list. */ |
root@mbed.org | 0:5e1631496985 | 733 | if (prev != NULL) { |
root@mbed.org | 0:5e1631496985 | 734 | LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs); |
root@mbed.org | 0:5e1631496985 | 735 | prev->next = pcb->next; |
root@mbed.org | 0:5e1631496985 | 736 | } else { |
root@mbed.org | 0:5e1631496985 | 737 | /* This PCB was the first. */ |
root@mbed.org | 0:5e1631496985 | 738 | LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb); |
root@mbed.org | 0:5e1631496985 | 739 | tcp_active_pcbs = pcb->next; |
root@mbed.org | 0:5e1631496985 | 740 | } |
root@mbed.org | 0:5e1631496985 | 741 | |
root@mbed.org | 0:5e1631496985 | 742 | TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT); |
root@mbed.org | 0:5e1631496985 | 743 | |
root@mbed.org | 0:5e1631496985 | 744 | pcb2 = pcb->next; |
root@mbed.org | 0:5e1631496985 | 745 | memp_free(MEMP_TCP_PCB, pcb); |
root@mbed.org | 0:5e1631496985 | 746 | pcb = pcb2; |
root@mbed.org | 0:5e1631496985 | 747 | } else { |
root@mbed.org | 0:5e1631496985 | 748 | |
root@mbed.org | 0:5e1631496985 | 749 | /* We check if we should poll the connection. */ |
root@mbed.org | 0:5e1631496985 | 750 | ++pcb->polltmr; |
root@mbed.org | 0:5e1631496985 | 751 | if (pcb->polltmr >= pcb->pollinterval) { |
root@mbed.org | 0:5e1631496985 | 752 | pcb->polltmr = 0; |
root@mbed.org | 0:5e1631496985 | 753 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n")); |
root@mbed.org | 0:5e1631496985 | 754 | TCP_EVENT_POLL(pcb, err); |
root@mbed.org | 0:5e1631496985 | 755 | if (err == ERR_OK) { |
root@mbed.org | 0:5e1631496985 | 756 | tcp_output(pcb); |
root@mbed.org | 0:5e1631496985 | 757 | } |
root@mbed.org | 0:5e1631496985 | 758 | } |
root@mbed.org | 0:5e1631496985 | 759 | |
root@mbed.org | 0:5e1631496985 | 760 | prev = pcb; |
root@mbed.org | 0:5e1631496985 | 761 | pcb = pcb->next; |
root@mbed.org | 0:5e1631496985 | 762 | } |
root@mbed.org | 0:5e1631496985 | 763 | } |
root@mbed.org | 0:5e1631496985 | 764 | |
root@mbed.org | 0:5e1631496985 | 765 | |
root@mbed.org | 0:5e1631496985 | 766 | /* Steps through all of the TIME-WAIT PCBs. */ |
root@mbed.org | 0:5e1631496985 | 767 | prev = NULL; |
root@mbed.org | 0:5e1631496985 | 768 | pcb = tcp_tw_pcbs; |
root@mbed.org | 0:5e1631496985 | 769 | while (pcb != NULL) { |
root@mbed.org | 0:5e1631496985 | 770 | LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT); |
root@mbed.org | 0:5e1631496985 | 771 | pcb_remove = 0; |
root@mbed.org | 0:5e1631496985 | 772 | |
root@mbed.org | 0:5e1631496985 | 773 | /* Check if this PCB has stayed long enough in TIME-WAIT */ |
root@mbed.org | 0:5e1631496985 | 774 | if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) { |
root@mbed.org | 0:5e1631496985 | 775 | ++pcb_remove; |
root@mbed.org | 0:5e1631496985 | 776 | } |
root@mbed.org | 0:5e1631496985 | 777 | |
root@mbed.org | 0:5e1631496985 | 778 | |
root@mbed.org | 0:5e1631496985 | 779 | |
root@mbed.org | 0:5e1631496985 | 780 | /* If the PCB should be removed, do it. */ |
root@mbed.org | 0:5e1631496985 | 781 | if (pcb_remove) { |
root@mbed.org | 0:5e1631496985 | 782 | tcp_pcb_purge(pcb); |
root@mbed.org | 0:5e1631496985 | 783 | /* Remove PCB from tcp_tw_pcbs list. */ |
root@mbed.org | 0:5e1631496985 | 784 | if (prev != NULL) { |
root@mbed.org | 0:5e1631496985 | 785 | LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs); |
root@mbed.org | 0:5e1631496985 | 786 | prev->next = pcb->next; |
root@mbed.org | 0:5e1631496985 | 787 | } else { |
root@mbed.org | 0:5e1631496985 | 788 | /* This PCB was the first. */ |
root@mbed.org | 0:5e1631496985 | 789 | LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb); |
root@mbed.org | 0:5e1631496985 | 790 | tcp_tw_pcbs = pcb->next; |
root@mbed.org | 0:5e1631496985 | 791 | } |
root@mbed.org | 0:5e1631496985 | 792 | pcb2 = pcb->next; |
root@mbed.org | 0:5e1631496985 | 793 | memp_free(MEMP_TCP_PCB, pcb); |
root@mbed.org | 0:5e1631496985 | 794 | pcb = pcb2; |
root@mbed.org | 0:5e1631496985 | 795 | } else { |
root@mbed.org | 0:5e1631496985 | 796 | prev = pcb; |
root@mbed.org | 0:5e1631496985 | 797 | pcb = pcb->next; |
root@mbed.org | 0:5e1631496985 | 798 | } |
root@mbed.org | 0:5e1631496985 | 799 | } |
root@mbed.org | 0:5e1631496985 | 800 | } |
root@mbed.org | 0:5e1631496985 | 801 | |
root@mbed.org | 0:5e1631496985 | 802 | /** |
root@mbed.org | 0:5e1631496985 | 803 | * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously |
root@mbed.org | 0:5e1631496985 | 804 | * "refused" by upper layer (application) and sends delayed ACKs. |
root@mbed.org | 0:5e1631496985 | 805 | * |
root@mbed.org | 0:5e1631496985 | 806 | * Automatically called from tcp_tmr(). |
root@mbed.org | 0:5e1631496985 | 807 | */ |
root@mbed.org | 0:5e1631496985 | 808 | void |
root@mbed.org | 0:5e1631496985 | 809 | tcp_fasttmr(void) |
root@mbed.org | 0:5e1631496985 | 810 | { |
root@mbed.org | 0:5e1631496985 | 811 | struct tcp_pcb *pcb; |
root@mbed.org | 0:5e1631496985 | 812 | |
root@mbed.org | 0:5e1631496985 | 813 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 814 | /* If there is data which was previously "refused" by upper layer */ |
root@mbed.org | 0:5e1631496985 | 815 | if (pcb->refused_data != NULL) { |
root@mbed.org | 0:5e1631496985 | 816 | /* Notify again application with data previously received. */ |
root@mbed.org | 0:5e1631496985 | 817 | err_t err; |
root@mbed.org | 0:5e1631496985 | 818 | LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n")); |
root@mbed.org | 0:5e1631496985 | 819 | TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err); |
root@mbed.org | 0:5e1631496985 | 820 | if (err == ERR_OK) { |
root@mbed.org | 0:5e1631496985 | 821 | pcb->refused_data = NULL; |
root@mbed.org | 0:5e1631496985 | 822 | } |
root@mbed.org | 0:5e1631496985 | 823 | } |
root@mbed.org | 0:5e1631496985 | 824 | |
root@mbed.org | 0:5e1631496985 | 825 | /* send delayed ACKs */ |
root@mbed.org | 0:5e1631496985 | 826 | if (pcb->flags & TF_ACK_DELAY) { |
root@mbed.org | 0:5e1631496985 | 827 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n")); |
root@mbed.org | 0:5e1631496985 | 828 | tcp_ack_now(pcb); |
root@mbed.org | 0:5e1631496985 | 829 | pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW); |
root@mbed.org | 0:5e1631496985 | 830 | } |
root@mbed.org | 0:5e1631496985 | 831 | } |
root@mbed.org | 0:5e1631496985 | 832 | } |
root@mbed.org | 0:5e1631496985 | 833 | |
root@mbed.org | 0:5e1631496985 | 834 | /** |
root@mbed.org | 0:5e1631496985 | 835 | * Deallocates a list of TCP segments (tcp_seg structures). |
root@mbed.org | 0:5e1631496985 | 836 | * |
root@mbed.org | 0:5e1631496985 | 837 | * @param seg tcp_seg list of TCP segments to free |
root@mbed.org | 0:5e1631496985 | 838 | * @return the number of pbufs that were deallocated |
root@mbed.org | 0:5e1631496985 | 839 | */ |
root@mbed.org | 0:5e1631496985 | 840 | u8_t |
root@mbed.org | 0:5e1631496985 | 841 | tcp_segs_free(struct tcp_seg *seg) |
root@mbed.org | 0:5e1631496985 | 842 | { |
root@mbed.org | 0:5e1631496985 | 843 | u8_t count = 0; |
root@mbed.org | 0:5e1631496985 | 844 | struct tcp_seg *next; |
root@mbed.org | 0:5e1631496985 | 845 | while (seg != NULL) { |
root@mbed.org | 0:5e1631496985 | 846 | next = seg->next; |
root@mbed.org | 0:5e1631496985 | 847 | count += tcp_seg_free(seg); |
root@mbed.org | 0:5e1631496985 | 848 | seg = next; |
root@mbed.org | 0:5e1631496985 | 849 | } |
root@mbed.org | 0:5e1631496985 | 850 | return count; |
root@mbed.org | 0:5e1631496985 | 851 | } |
root@mbed.org | 0:5e1631496985 | 852 | |
root@mbed.org | 0:5e1631496985 | 853 | /** |
root@mbed.org | 0:5e1631496985 | 854 | * Frees a TCP segment (tcp_seg structure). |
root@mbed.org | 0:5e1631496985 | 855 | * |
root@mbed.org | 0:5e1631496985 | 856 | * @param seg single tcp_seg to free |
root@mbed.org | 0:5e1631496985 | 857 | * @return the number of pbufs that were deallocated |
root@mbed.org | 0:5e1631496985 | 858 | */ |
root@mbed.org | 0:5e1631496985 | 859 | u8_t |
root@mbed.org | 0:5e1631496985 | 860 | tcp_seg_free(struct tcp_seg *seg) |
root@mbed.org | 0:5e1631496985 | 861 | { |
root@mbed.org | 0:5e1631496985 | 862 | u8_t count = 0; |
root@mbed.org | 0:5e1631496985 | 863 | |
root@mbed.org | 0:5e1631496985 | 864 | if (seg != NULL) { |
root@mbed.org | 0:5e1631496985 | 865 | if (seg->p != NULL) { |
root@mbed.org | 0:5e1631496985 | 866 | count = pbuf_free(seg->p); |
root@mbed.org | 0:5e1631496985 | 867 | #if TCP_DEBUG |
root@mbed.org | 0:5e1631496985 | 868 | seg->p = NULL; |
root@mbed.org | 0:5e1631496985 | 869 | #endif /* TCP_DEBUG */ |
root@mbed.org | 0:5e1631496985 | 870 | } |
root@mbed.org | 0:5e1631496985 | 871 | memp_free(MEMP_TCP_SEG, seg); |
root@mbed.org | 0:5e1631496985 | 872 | } |
root@mbed.org | 0:5e1631496985 | 873 | return count; |
root@mbed.org | 0:5e1631496985 | 874 | } |
root@mbed.org | 0:5e1631496985 | 875 | |
root@mbed.org | 0:5e1631496985 | 876 | /** |
root@mbed.org | 0:5e1631496985 | 877 | * Sets the priority of a connection. |
root@mbed.org | 0:5e1631496985 | 878 | * |
root@mbed.org | 0:5e1631496985 | 879 | * @param pcb the tcp_pcb to manipulate |
root@mbed.org | 0:5e1631496985 | 880 | * @param prio new priority |
root@mbed.org | 0:5e1631496985 | 881 | */ |
root@mbed.org | 0:5e1631496985 | 882 | void |
root@mbed.org | 0:5e1631496985 | 883 | tcp_setprio(struct tcp_pcb *pcb, u8_t prio) |
root@mbed.org | 0:5e1631496985 | 884 | { |
root@mbed.org | 0:5e1631496985 | 885 | pcb->prio = prio; |
root@mbed.org | 0:5e1631496985 | 886 | } |
root@mbed.org | 0:5e1631496985 | 887 | #if TCP_QUEUE_OOSEQ |
root@mbed.org | 0:5e1631496985 | 888 | |
root@mbed.org | 0:5e1631496985 | 889 | /** |
root@mbed.org | 0:5e1631496985 | 890 | * Returns a copy of the given TCP segment. |
root@mbed.org | 0:5e1631496985 | 891 | * The pbuf and data are not copied, only the pointers |
root@mbed.org | 0:5e1631496985 | 892 | * |
root@mbed.org | 0:5e1631496985 | 893 | * @param seg the old tcp_seg |
root@mbed.org | 0:5e1631496985 | 894 | * @return a copy of seg |
root@mbed.org | 0:5e1631496985 | 895 | */ |
root@mbed.org | 0:5e1631496985 | 896 | struct tcp_seg * |
root@mbed.org | 0:5e1631496985 | 897 | tcp_seg_copy(struct tcp_seg *seg) |
root@mbed.org | 0:5e1631496985 | 898 | { |
root@mbed.org | 0:5e1631496985 | 899 | struct tcp_seg *cseg; |
root@mbed.org | 0:5e1631496985 | 900 | |
root@mbed.org | 0:5e1631496985 | 901 | cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG); |
root@mbed.org | 0:5e1631496985 | 902 | if (cseg == NULL) { |
root@mbed.org | 0:5e1631496985 | 903 | return NULL; |
root@mbed.org | 0:5e1631496985 | 904 | } |
root@mbed.org | 0:5e1631496985 | 905 | SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg)); |
root@mbed.org | 0:5e1631496985 | 906 | pbuf_ref(cseg->p); |
root@mbed.org | 0:5e1631496985 | 907 | return cseg; |
root@mbed.org | 0:5e1631496985 | 908 | } |
root@mbed.org | 0:5e1631496985 | 909 | #endif |
root@mbed.org | 0:5e1631496985 | 910 | |
root@mbed.org | 0:5e1631496985 | 911 | #if LWIP_CALLBACK_API |
root@mbed.org | 0:5e1631496985 | 912 | /** |
root@mbed.org | 0:5e1631496985 | 913 | * Default receive callback that is called if the user didn't register |
root@mbed.org | 0:5e1631496985 | 914 | * a recv callback for the pcb. |
root@mbed.org | 0:5e1631496985 | 915 | */ |
root@mbed.org | 0:5e1631496985 | 916 | static err_t |
root@mbed.org | 0:5e1631496985 | 917 | tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err) |
root@mbed.org | 0:5e1631496985 | 918 | { |
root@mbed.org | 0:5e1631496985 | 919 | arg = arg; |
root@mbed.org | 0:5e1631496985 | 920 | if (p != NULL) { |
root@mbed.org | 0:5e1631496985 | 921 | pbuf_free(p); |
root@mbed.org | 0:5e1631496985 | 922 | } else if (err == ERR_OK) { |
root@mbed.org | 0:5e1631496985 | 923 | return tcp_close(pcb); |
root@mbed.org | 0:5e1631496985 | 924 | } |
root@mbed.org | 0:5e1631496985 | 925 | return ERR_OK; |
root@mbed.org | 0:5e1631496985 | 926 | } |
root@mbed.org | 0:5e1631496985 | 927 | #endif /* LWIP_CALLBACK_API */ |
root@mbed.org | 0:5e1631496985 | 928 | |
root@mbed.org | 0:5e1631496985 | 929 | /** |
root@mbed.org | 0:5e1631496985 | 930 | * Kills the oldest active connection that has lower priority than prio. |
root@mbed.org | 0:5e1631496985 | 931 | * |
root@mbed.org | 0:5e1631496985 | 932 | * @param prio minimum priority |
root@mbed.org | 0:5e1631496985 | 933 | */ |
root@mbed.org | 0:5e1631496985 | 934 | static void |
root@mbed.org | 0:5e1631496985 | 935 | tcp_kill_prio(u8_t prio) |
root@mbed.org | 0:5e1631496985 | 936 | { |
root@mbed.org | 0:5e1631496985 | 937 | struct tcp_pcb *pcb, *inactive; |
root@mbed.org | 0:5e1631496985 | 938 | u32_t inactivity; |
root@mbed.org | 0:5e1631496985 | 939 | u8_t mprio; |
root@mbed.org | 0:5e1631496985 | 940 | |
root@mbed.org | 0:5e1631496985 | 941 | |
root@mbed.org | 0:5e1631496985 | 942 | mprio = TCP_PRIO_MAX; |
root@mbed.org | 0:5e1631496985 | 943 | |
root@mbed.org | 0:5e1631496985 | 944 | /* We kill the oldest active connection that has lower priority than prio. */ |
root@mbed.org | 0:5e1631496985 | 945 | inactivity = 0; |
root@mbed.org | 0:5e1631496985 | 946 | inactive = NULL; |
root@mbed.org | 0:5e1631496985 | 947 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 948 | if (pcb->prio <= prio && |
root@mbed.org | 0:5e1631496985 | 949 | pcb->prio <= mprio && |
root@mbed.org | 0:5e1631496985 | 950 | (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) { |
root@mbed.org | 0:5e1631496985 | 951 | inactivity = tcp_ticks - pcb->tmr; |
root@mbed.org | 0:5e1631496985 | 952 | inactive = pcb; |
root@mbed.org | 0:5e1631496985 | 953 | mprio = pcb->prio; |
root@mbed.org | 0:5e1631496985 | 954 | } |
root@mbed.org | 0:5e1631496985 | 955 | } |
root@mbed.org | 0:5e1631496985 | 956 | if (inactive != NULL) { |
root@mbed.org | 0:5e1631496985 | 957 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n", |
root@mbed.org | 0:5e1631496985 | 958 | (void *)inactive, inactivity)); |
root@mbed.org | 0:5e1631496985 | 959 | tcp_abort(inactive); |
root@mbed.org | 0:5e1631496985 | 960 | } |
root@mbed.org | 0:5e1631496985 | 961 | } |
root@mbed.org | 0:5e1631496985 | 962 | |
root@mbed.org | 0:5e1631496985 | 963 | /** |
root@mbed.org | 0:5e1631496985 | 964 | * Kills the oldest connection that is in TIME_WAIT state. |
root@mbed.org | 0:5e1631496985 | 965 | * Called from tcp_alloc() if no more connections are available. |
root@mbed.org | 0:5e1631496985 | 966 | */ |
root@mbed.org | 0:5e1631496985 | 967 | static void |
root@mbed.org | 0:5e1631496985 | 968 | tcp_kill_timewait(void) |
root@mbed.org | 0:5e1631496985 | 969 | { |
root@mbed.org | 0:5e1631496985 | 970 | struct tcp_pcb *pcb, *inactive; |
root@mbed.org | 0:5e1631496985 | 971 | u32_t inactivity; |
root@mbed.org | 0:5e1631496985 | 972 | |
root@mbed.org | 0:5e1631496985 | 973 | inactivity = 0; |
root@mbed.org | 0:5e1631496985 | 974 | inactive = NULL; |
root@mbed.org | 0:5e1631496985 | 975 | /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */ |
root@mbed.org | 0:5e1631496985 | 976 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 977 | if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) { |
root@mbed.org | 0:5e1631496985 | 978 | inactivity = tcp_ticks - pcb->tmr; |
root@mbed.org | 0:5e1631496985 | 979 | inactive = pcb; |
root@mbed.org | 0:5e1631496985 | 980 | } |
root@mbed.org | 0:5e1631496985 | 981 | } |
root@mbed.org | 0:5e1631496985 | 982 | if (inactive != NULL) { |
root@mbed.org | 0:5e1631496985 | 983 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n", |
root@mbed.org | 0:5e1631496985 | 984 | (void *)inactive, inactivity)); |
root@mbed.org | 0:5e1631496985 | 985 | tcp_abort(inactive); |
root@mbed.org | 0:5e1631496985 | 986 | } |
root@mbed.org | 0:5e1631496985 | 987 | } |
root@mbed.org | 0:5e1631496985 | 988 | |
root@mbed.org | 0:5e1631496985 | 989 | /** |
root@mbed.org | 0:5e1631496985 | 990 | * Allocate a new tcp_pcb structure. |
root@mbed.org | 0:5e1631496985 | 991 | * |
root@mbed.org | 0:5e1631496985 | 992 | * @param prio priority for the new pcb |
root@mbed.org | 0:5e1631496985 | 993 | * @return a new tcp_pcb that initially is in state CLOSED |
root@mbed.org | 0:5e1631496985 | 994 | */ |
root@mbed.org | 0:5e1631496985 | 995 | struct tcp_pcb * |
root@mbed.org | 0:5e1631496985 | 996 | tcp_alloc(u8_t prio) |
root@mbed.org | 0:5e1631496985 | 997 | { |
root@mbed.org | 0:5e1631496985 | 998 | struct tcp_pcb *pcb; |
root@mbed.org | 0:5e1631496985 | 999 | u32_t iss; |
root@mbed.org | 0:5e1631496985 | 1000 | |
root@mbed.org | 0:5e1631496985 | 1001 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB); |
root@mbed.org | 0:5e1631496985 | 1002 | if (pcb == NULL) { |
root@mbed.org | 0:5e1631496985 | 1003 | /* Try killing oldest connection in TIME-WAIT. */ |
root@mbed.org | 0:5e1631496985 | 1004 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n")); |
root@mbed.org | 0:5e1631496985 | 1005 | tcp_kill_timewait(); |
root@mbed.org | 0:5e1631496985 | 1006 | /* Try to allocate a tcp_pcb again. */ |
root@mbed.org | 0:5e1631496985 | 1007 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB); |
root@mbed.org | 0:5e1631496985 | 1008 | if (pcb == NULL) { |
root@mbed.org | 0:5e1631496985 | 1009 | /* Try killing active connections with lower priority than the new one. */ |
root@mbed.org | 0:5e1631496985 | 1010 | tcp_kill_prio(prio); |
root@mbed.org | 0:5e1631496985 | 1011 | /* Try to allocate a tcp_pcb again. */ |
root@mbed.org | 0:5e1631496985 | 1012 | pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB); |
root@mbed.org | 0:5e1631496985 | 1013 | } |
root@mbed.org | 0:5e1631496985 | 1014 | } |
root@mbed.org | 0:5e1631496985 | 1015 | if (pcb != NULL) { |
root@mbed.org | 0:5e1631496985 | 1016 | memset(pcb, 0, sizeof(struct tcp_pcb)); |
root@mbed.org | 0:5e1631496985 | 1017 | pcb->prio = TCP_PRIO_NORMAL; |
root@mbed.org | 0:5e1631496985 | 1018 | pcb->snd_buf = TCP_SND_BUF; |
root@mbed.org | 0:5e1631496985 | 1019 | pcb->snd_queuelen = 0; |
root@mbed.org | 0:5e1631496985 | 1020 | pcb->rcv_wnd = TCP_WND; |
root@mbed.org | 0:5e1631496985 | 1021 | pcb->rcv_ann_wnd = TCP_WND; |
root@mbed.org | 0:5e1631496985 | 1022 | pcb->tos = 0; |
root@mbed.org | 0:5e1631496985 | 1023 | pcb->ttl = TCP_TTL; |
root@mbed.org | 0:5e1631496985 | 1024 | /* As initial send MSS, we use TCP_MSS but limit it to 536. |
root@mbed.org | 0:5e1631496985 | 1025 | The send MSS is updated when an MSS option is received. */ |
root@mbed.org | 0:5e1631496985 | 1026 | pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS; |
root@mbed.org | 0:5e1631496985 | 1027 | pcb->rto = 3000 / TCP_SLOW_INTERVAL; |
root@mbed.org | 0:5e1631496985 | 1028 | pcb->sa = 0; |
root@mbed.org | 0:5e1631496985 | 1029 | pcb->sv = 3000 / TCP_SLOW_INTERVAL; |
root@mbed.org | 0:5e1631496985 | 1030 | pcb->rtime = -1; |
root@mbed.org | 0:5e1631496985 | 1031 | pcb->cwnd = 1; |
root@mbed.org | 0:5e1631496985 | 1032 | iss = tcp_next_iss(); |
root@mbed.org | 0:5e1631496985 | 1033 | pcb->snd_wl2 = iss; |
root@mbed.org | 0:5e1631496985 | 1034 | pcb->snd_nxt = iss; |
root@mbed.org | 0:5e1631496985 | 1035 | pcb->lastack = iss; |
root@mbed.org | 0:5e1631496985 | 1036 | pcb->snd_lbb = iss; |
root@mbed.org | 0:5e1631496985 | 1037 | pcb->tmr = tcp_ticks; |
root@mbed.org | 0:5e1631496985 | 1038 | |
root@mbed.org | 0:5e1631496985 | 1039 | pcb->polltmr = 0; |
root@mbed.org | 0:5e1631496985 | 1040 | |
root@mbed.org | 0:5e1631496985 | 1041 | #if LWIP_CALLBACK_API |
root@mbed.org | 0:5e1631496985 | 1042 | pcb->recv = tcp_recv_null; |
root@mbed.org | 0:5e1631496985 | 1043 | #endif /* LWIP_CALLBACK_API */ |
root@mbed.org | 0:5e1631496985 | 1044 | |
root@mbed.org | 0:5e1631496985 | 1045 | /* Init KEEPALIVE timer */ |
root@mbed.org | 0:5e1631496985 | 1046 | pcb->keep_idle = TCP_KEEPIDLE_DEFAULT; |
root@mbed.org | 0:5e1631496985 | 1047 | |
root@mbed.org | 0:5e1631496985 | 1048 | #if LWIP_TCP_KEEPALIVE |
root@mbed.org | 0:5e1631496985 | 1049 | pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT; |
root@mbed.org | 0:5e1631496985 | 1050 | pcb->keep_cnt = TCP_KEEPCNT_DEFAULT; |
root@mbed.org | 0:5e1631496985 | 1051 | #endif /* LWIP_TCP_KEEPALIVE */ |
root@mbed.org | 0:5e1631496985 | 1052 | |
root@mbed.org | 0:5e1631496985 | 1053 | pcb->keep_cnt_sent = 0; |
root@mbed.org | 0:5e1631496985 | 1054 | } |
root@mbed.org | 0:5e1631496985 | 1055 | return pcb; |
root@mbed.org | 0:5e1631496985 | 1056 | } |
root@mbed.org | 0:5e1631496985 | 1057 | |
root@mbed.org | 0:5e1631496985 | 1058 | /** |
root@mbed.org | 0:5e1631496985 | 1059 | * Creates a new TCP protocol control block but doesn't place it on |
root@mbed.org | 0:5e1631496985 | 1060 | * any of the TCP PCB lists. |
root@mbed.org | 0:5e1631496985 | 1061 | * The pcb is not put on any list until binding using tcp_bind(). |
root@mbed.org | 0:5e1631496985 | 1062 | * |
root@mbed.org | 0:5e1631496985 | 1063 | * @internal: Maybe there should be a idle TCP PCB list where these |
root@mbed.org | 0:5e1631496985 | 1064 | * PCBs are put on. Port reservation using tcp_bind() is implemented but |
root@mbed.org | 0:5e1631496985 | 1065 | * allocated pcbs that are not bound can't be killed automatically if wanting |
root@mbed.org | 0:5e1631496985 | 1066 | * to allocate a pcb with higher prio (@see tcp_kill_prio()) |
root@mbed.org | 0:5e1631496985 | 1067 | * |
root@mbed.org | 0:5e1631496985 | 1068 | * @return a new tcp_pcb that initially is in state CLOSED |
root@mbed.org | 0:5e1631496985 | 1069 | */ |
root@mbed.org | 0:5e1631496985 | 1070 | struct tcp_pcb * |
root@mbed.org | 0:5e1631496985 | 1071 | tcp_new(void) |
root@mbed.org | 0:5e1631496985 | 1072 | { |
root@mbed.org | 0:5e1631496985 | 1073 | return tcp_alloc(TCP_PRIO_NORMAL); |
root@mbed.org | 0:5e1631496985 | 1074 | } |
root@mbed.org | 0:5e1631496985 | 1075 | |
root@mbed.org | 0:5e1631496985 | 1076 | /** |
root@mbed.org | 0:5e1631496985 | 1077 | * Used to specify the argument that should be passed callback |
root@mbed.org | 0:5e1631496985 | 1078 | * functions. |
root@mbed.org | 0:5e1631496985 | 1079 | * |
root@mbed.org | 0:5e1631496985 | 1080 | * @param pcb tcp_pcb to set the callback argument |
root@mbed.org | 0:5e1631496985 | 1081 | * @param arg void pointer argument to pass to callback functions |
root@mbed.org | 0:5e1631496985 | 1082 | */ |
root@mbed.org | 0:5e1631496985 | 1083 | void |
root@mbed.org | 0:5e1631496985 | 1084 | tcp_arg(struct tcp_pcb *pcb, void *arg) |
root@mbed.org | 0:5e1631496985 | 1085 | { |
root@mbed.org | 0:5e1631496985 | 1086 | pcb->callback_arg = arg; |
root@mbed.org | 0:5e1631496985 | 1087 | } |
root@mbed.org | 0:5e1631496985 | 1088 | #if LWIP_CALLBACK_API |
root@mbed.org | 0:5e1631496985 | 1089 | |
root@mbed.org | 0:5e1631496985 | 1090 | /** |
root@mbed.org | 0:5e1631496985 | 1091 | * Used to specify the function that should be called when a TCP |
root@mbed.org | 0:5e1631496985 | 1092 | * connection receives data. |
root@mbed.org | 0:5e1631496985 | 1093 | * |
root@mbed.org | 0:5e1631496985 | 1094 | * @param pcb tcp_pcb to set the recv callback |
root@mbed.org | 0:5e1631496985 | 1095 | * @param recv callback function to call for this pcb when data is received |
root@mbed.org | 0:5e1631496985 | 1096 | */ |
root@mbed.org | 0:5e1631496985 | 1097 | void |
root@mbed.org | 0:5e1631496985 | 1098 | tcp_recv(struct tcp_pcb *pcb, |
root@mbed.org | 0:5e1631496985 | 1099 | err_t (* recv)(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err)) |
root@mbed.org | 0:5e1631496985 | 1100 | { |
root@mbed.org | 0:5e1631496985 | 1101 | pcb->recv = recv; |
root@mbed.org | 0:5e1631496985 | 1102 | } |
root@mbed.org | 0:5e1631496985 | 1103 | |
root@mbed.org | 0:5e1631496985 | 1104 | /** |
root@mbed.org | 0:5e1631496985 | 1105 | * Used to specify the function that should be called when TCP data |
root@mbed.org | 0:5e1631496985 | 1106 | * has been successfully delivered to the remote host. |
root@mbed.org | 0:5e1631496985 | 1107 | * |
root@mbed.org | 0:5e1631496985 | 1108 | * @param pcb tcp_pcb to set the sent callback |
root@mbed.org | 0:5e1631496985 | 1109 | * @param sent callback function to call for this pcb when data is successfully sent |
root@mbed.org | 0:5e1631496985 | 1110 | */ |
root@mbed.org | 0:5e1631496985 | 1111 | void |
root@mbed.org | 0:5e1631496985 | 1112 | tcp_sent(struct tcp_pcb *pcb, |
root@mbed.org | 0:5e1631496985 | 1113 | err_t (* sent)(void *arg, struct tcp_pcb *tpcb, u16_t len)) |
root@mbed.org | 0:5e1631496985 | 1114 | { |
root@mbed.org | 0:5e1631496985 | 1115 | pcb->sent = sent; |
root@mbed.org | 0:5e1631496985 | 1116 | } |
root@mbed.org | 0:5e1631496985 | 1117 | |
root@mbed.org | 0:5e1631496985 | 1118 | /** |
root@mbed.org | 0:5e1631496985 | 1119 | * Used to specify the function that should be called when a fatal error |
root@mbed.org | 0:5e1631496985 | 1120 | * has occured on the connection. |
root@mbed.org | 0:5e1631496985 | 1121 | * |
root@mbed.org | 0:5e1631496985 | 1122 | * @param pcb tcp_pcb to set the err callback |
root@mbed.org | 0:5e1631496985 | 1123 | * @param errf callback function to call for this pcb when a fatal error |
root@mbed.org | 0:5e1631496985 | 1124 | * has occured on the connection |
root@mbed.org | 0:5e1631496985 | 1125 | */ |
root@mbed.org | 0:5e1631496985 | 1126 | void |
root@mbed.org | 0:5e1631496985 | 1127 | tcp_err(struct tcp_pcb *pcb, |
root@mbed.org | 0:5e1631496985 | 1128 | void (* errf)(void *arg, err_t err)) |
root@mbed.org | 0:5e1631496985 | 1129 | { |
root@mbed.org | 0:5e1631496985 | 1130 | pcb->errf = errf; |
root@mbed.org | 0:5e1631496985 | 1131 | } |
root@mbed.org | 0:5e1631496985 | 1132 | |
root@mbed.org | 0:5e1631496985 | 1133 | /** |
root@mbed.org | 0:5e1631496985 | 1134 | * Used for specifying the function that should be called when a |
root@mbed.org | 0:5e1631496985 | 1135 | * LISTENing connection has been connected to another host. |
root@mbed.org | 0:5e1631496985 | 1136 | * |
root@mbed.org | 0:5e1631496985 | 1137 | * @param pcb tcp_pcb to set the accept callback |
root@mbed.org | 0:5e1631496985 | 1138 | * @param accept callback function to call for this pcb when LISTENing |
root@mbed.org | 0:5e1631496985 | 1139 | * connection has been connected to another host |
root@mbed.org | 0:5e1631496985 | 1140 | */ |
root@mbed.org | 0:5e1631496985 | 1141 | void |
root@mbed.org | 0:5e1631496985 | 1142 | tcp_accept(struct tcp_pcb *pcb, |
root@mbed.org | 0:5e1631496985 | 1143 | err_t (* accept)(void *arg, struct tcp_pcb *newpcb, err_t err)) |
root@mbed.org | 0:5e1631496985 | 1144 | { |
root@mbed.org | 0:5e1631496985 | 1145 | pcb->accept = accept; |
root@mbed.org | 0:5e1631496985 | 1146 | } |
root@mbed.org | 0:5e1631496985 | 1147 | #endif /* LWIP_CALLBACK_API */ |
root@mbed.org | 0:5e1631496985 | 1148 | |
root@mbed.org | 0:5e1631496985 | 1149 | |
root@mbed.org | 0:5e1631496985 | 1150 | /** |
root@mbed.org | 0:5e1631496985 | 1151 | * Used to specify the function that should be called periodically |
root@mbed.org | 0:5e1631496985 | 1152 | * from TCP. The interval is specified in terms of the TCP coarse |
root@mbed.org | 0:5e1631496985 | 1153 | * timer interval, which is called twice a second. |
root@mbed.org | 0:5e1631496985 | 1154 | * |
root@mbed.org | 0:5e1631496985 | 1155 | */ |
root@mbed.org | 0:5e1631496985 | 1156 | void |
root@mbed.org | 0:5e1631496985 | 1157 | tcp_poll(struct tcp_pcb *pcb, |
root@mbed.org | 0:5e1631496985 | 1158 | err_t (* poll)(void *arg, struct tcp_pcb *tpcb), u8_t interval) |
root@mbed.org | 0:5e1631496985 | 1159 | { |
root@mbed.org | 0:5e1631496985 | 1160 | #if LWIP_CALLBACK_API |
root@mbed.org | 0:5e1631496985 | 1161 | pcb->poll = poll; |
root@mbed.org | 0:5e1631496985 | 1162 | #endif /* LWIP_CALLBACK_API */ |
root@mbed.org | 0:5e1631496985 | 1163 | pcb->pollinterval = interval; |
root@mbed.org | 0:5e1631496985 | 1164 | } |
root@mbed.org | 0:5e1631496985 | 1165 | |
root@mbed.org | 0:5e1631496985 | 1166 | /** |
root@mbed.org | 0:5e1631496985 | 1167 | * Purges a TCP PCB. Removes any buffered data and frees the buffer memory |
root@mbed.org | 0:5e1631496985 | 1168 | * (pcb->ooseq, pcb->unsent and pcb->unacked are freed). |
root@mbed.org | 0:5e1631496985 | 1169 | * |
root@mbed.org | 0:5e1631496985 | 1170 | * @param pcb tcp_pcb to purge. The pcb itself is not deallocated! |
root@mbed.org | 0:5e1631496985 | 1171 | */ |
root@mbed.org | 0:5e1631496985 | 1172 | void |
root@mbed.org | 0:5e1631496985 | 1173 | tcp_pcb_purge(struct tcp_pcb *pcb) |
root@mbed.org | 0:5e1631496985 | 1174 | { |
root@mbed.org | 0:5e1631496985 | 1175 | if (pcb->state != CLOSED && |
root@mbed.org | 0:5e1631496985 | 1176 | pcb->state != TIME_WAIT && |
root@mbed.org | 0:5e1631496985 | 1177 | pcb->state != LISTEN) { |
root@mbed.org | 0:5e1631496985 | 1178 | |
root@mbed.org | 0:5e1631496985 | 1179 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n")); |
root@mbed.org | 0:5e1631496985 | 1180 | |
root@mbed.org | 0:5e1631496985 | 1181 | #if TCP_LISTEN_BACKLOG |
root@mbed.org | 0:5e1631496985 | 1182 | if (pcb->state == SYN_RCVD) { |
root@mbed.org | 0:5e1631496985 | 1183 | /* Need to find the corresponding listen_pcb and decrease its accepts_pending */ |
root@mbed.org | 0:5e1631496985 | 1184 | struct tcp_pcb_listen *lpcb; |
root@mbed.org | 0:5e1631496985 | 1185 | LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL", |
root@mbed.org | 0:5e1631496985 | 1186 | tcp_listen_pcbs.listen_pcbs != NULL); |
root@mbed.org | 0:5e1631496985 | 1187 | for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) { |
root@mbed.org | 0:5e1631496985 | 1188 | if ((lpcb->local_port == pcb->local_port) && |
root@mbed.org | 0:5e1631496985 | 1189 | (ip_addr_isany(&lpcb->local_ip) || |
root@mbed.org | 0:5e1631496985 | 1190 | ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) { |
root@mbed.org | 0:5e1631496985 | 1191 | /* port and address of the listen pcb match the timed-out pcb */ |
root@mbed.org | 0:5e1631496985 | 1192 | LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending", |
root@mbed.org | 0:5e1631496985 | 1193 | lpcb->accepts_pending > 0); |
root@mbed.org | 0:5e1631496985 | 1194 | lpcb->accepts_pending--; |
root@mbed.org | 0:5e1631496985 | 1195 | break; |
root@mbed.org | 0:5e1631496985 | 1196 | } |
root@mbed.org | 0:5e1631496985 | 1197 | } |
root@mbed.org | 0:5e1631496985 | 1198 | } |
root@mbed.org | 0:5e1631496985 | 1199 | #endif /* TCP_LISTEN_BACKLOG */ |
root@mbed.org | 0:5e1631496985 | 1200 | |
root@mbed.org | 0:5e1631496985 | 1201 | |
root@mbed.org | 0:5e1631496985 | 1202 | if (pcb->refused_data != NULL) { |
root@mbed.org | 0:5e1631496985 | 1203 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n")); |
root@mbed.org | 0:5e1631496985 | 1204 | pbuf_free(pcb->refused_data); |
root@mbed.org | 0:5e1631496985 | 1205 | pcb->refused_data = NULL; |
root@mbed.org | 0:5e1631496985 | 1206 | } |
root@mbed.org | 0:5e1631496985 | 1207 | if (pcb->unsent != NULL) { |
root@mbed.org | 0:5e1631496985 | 1208 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n")); |
root@mbed.org | 0:5e1631496985 | 1209 | } |
root@mbed.org | 0:5e1631496985 | 1210 | if (pcb->unacked != NULL) { |
root@mbed.org | 0:5e1631496985 | 1211 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n")); |
root@mbed.org | 0:5e1631496985 | 1212 | } |
root@mbed.org | 0:5e1631496985 | 1213 | #if TCP_QUEUE_OOSEQ /* LW */ |
root@mbed.org | 0:5e1631496985 | 1214 | if (pcb->ooseq != NULL) { |
root@mbed.org | 0:5e1631496985 | 1215 | LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n")); |
root@mbed.org | 0:5e1631496985 | 1216 | } |
root@mbed.org | 0:5e1631496985 | 1217 | |
root@mbed.org | 0:5e1631496985 | 1218 | /* Stop the retransmission timer as it will expect data on unacked |
root@mbed.org | 0:5e1631496985 | 1219 | queue if it fires */ |
root@mbed.org | 0:5e1631496985 | 1220 | pcb->rtime = -1; |
root@mbed.org | 0:5e1631496985 | 1221 | |
root@mbed.org | 0:5e1631496985 | 1222 | tcp_segs_free(pcb->ooseq); |
root@mbed.org | 0:5e1631496985 | 1223 | pcb->ooseq = NULL; |
root@mbed.org | 0:5e1631496985 | 1224 | #endif /* TCP_QUEUE_OOSEQ */ |
root@mbed.org | 0:5e1631496985 | 1225 | tcp_segs_free(pcb->unsent); |
root@mbed.org | 0:5e1631496985 | 1226 | tcp_segs_free(pcb->unacked); |
root@mbed.org | 0:5e1631496985 | 1227 | pcb->unacked = pcb->unsent = NULL; |
root@mbed.org | 0:5e1631496985 | 1228 | } |
root@mbed.org | 0:5e1631496985 | 1229 | } |
root@mbed.org | 0:5e1631496985 | 1230 | |
root@mbed.org | 0:5e1631496985 | 1231 | /** |
root@mbed.org | 0:5e1631496985 | 1232 | * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first. |
root@mbed.org | 0:5e1631496985 | 1233 | * |
root@mbed.org | 0:5e1631496985 | 1234 | * @param pcblist PCB list to purge. |
root@mbed.org | 0:5e1631496985 | 1235 | * @param pcb tcp_pcb to purge. The pcb itself is also deallocated! |
root@mbed.org | 0:5e1631496985 | 1236 | */ |
root@mbed.org | 0:5e1631496985 | 1237 | void |
root@mbed.org | 0:5e1631496985 | 1238 | tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb) |
root@mbed.org | 0:5e1631496985 | 1239 | { |
root@mbed.org | 0:5e1631496985 | 1240 | TCP_RMV(pcblist, pcb); |
root@mbed.org | 0:5e1631496985 | 1241 | |
root@mbed.org | 0:5e1631496985 | 1242 | tcp_pcb_purge(pcb); |
root@mbed.org | 0:5e1631496985 | 1243 | |
root@mbed.org | 0:5e1631496985 | 1244 | /* if there is an outstanding delayed ACKs, send it */ |
root@mbed.org | 0:5e1631496985 | 1245 | if (pcb->state != TIME_WAIT && |
root@mbed.org | 0:5e1631496985 | 1246 | pcb->state != LISTEN && |
root@mbed.org | 0:5e1631496985 | 1247 | pcb->flags & TF_ACK_DELAY) { |
root@mbed.org | 0:5e1631496985 | 1248 | pcb->flags |= TF_ACK_NOW; |
root@mbed.org | 0:5e1631496985 | 1249 | tcp_output(pcb); |
root@mbed.org | 0:5e1631496985 | 1250 | } |
root@mbed.org | 0:5e1631496985 | 1251 | |
root@mbed.org | 0:5e1631496985 | 1252 | if (pcb->state != LISTEN) { |
root@mbed.org | 0:5e1631496985 | 1253 | LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL); |
root@mbed.org | 0:5e1631496985 | 1254 | LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL); |
root@mbed.org | 0:5e1631496985 | 1255 | #if TCP_QUEUE_OOSEQ |
root@mbed.org | 0:5e1631496985 | 1256 | LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL); |
root@mbed.org | 0:5e1631496985 | 1257 | #endif /* TCP_QUEUE_OOSEQ */ |
root@mbed.org | 0:5e1631496985 | 1258 | } |
root@mbed.org | 0:5e1631496985 | 1259 | |
root@mbed.org | 0:5e1631496985 | 1260 | pcb->state = CLOSED; |
root@mbed.org | 0:5e1631496985 | 1261 | |
root@mbed.org | 0:5e1631496985 | 1262 | LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane()); |
root@mbed.org | 0:5e1631496985 | 1263 | } |
root@mbed.org | 0:5e1631496985 | 1264 | |
root@mbed.org | 0:5e1631496985 | 1265 | /** |
root@mbed.org | 0:5e1631496985 | 1266 | * Calculates a new initial sequence number for new connections. |
root@mbed.org | 0:5e1631496985 | 1267 | * |
root@mbed.org | 0:5e1631496985 | 1268 | * @return u32_t pseudo random sequence number |
root@mbed.org | 0:5e1631496985 | 1269 | */ |
root@mbed.org | 0:5e1631496985 | 1270 | u32_t |
root@mbed.org | 0:5e1631496985 | 1271 | tcp_next_iss(void) |
root@mbed.org | 0:5e1631496985 | 1272 | { |
root@mbed.org | 0:5e1631496985 | 1273 | static u32_t iss = 6510; |
root@mbed.org | 0:5e1631496985 | 1274 | |
root@mbed.org | 0:5e1631496985 | 1275 | iss += tcp_ticks; /* XXX */ |
root@mbed.org | 0:5e1631496985 | 1276 | return iss; |
root@mbed.org | 0:5e1631496985 | 1277 | } |
root@mbed.org | 0:5e1631496985 | 1278 | |
root@mbed.org | 0:5e1631496985 | 1279 | #if TCP_CALCULATE_EFF_SEND_MSS |
root@mbed.org | 0:5e1631496985 | 1280 | /** |
root@mbed.org | 0:5e1631496985 | 1281 | * Calcluates the effective send mss that can be used for a specific IP address |
root@mbed.org | 0:5e1631496985 | 1282 | * by using ip_route to determin the netif used to send to the address and |
root@mbed.org | 0:5e1631496985 | 1283 | * calculating the minimum of TCP_MSS and that netif's mtu (if set). |
root@mbed.org | 0:5e1631496985 | 1284 | */ |
root@mbed.org | 0:5e1631496985 | 1285 | u16_t |
root@mbed.org | 0:5e1631496985 | 1286 | tcp_eff_send_mss(u16_t sendmss, struct ip_addr *addr) |
root@mbed.org | 0:5e1631496985 | 1287 | { |
root@mbed.org | 0:5e1631496985 | 1288 | u16_t mss_s; |
root@mbed.org | 0:5e1631496985 | 1289 | struct netif *outif; |
root@mbed.org | 0:5e1631496985 | 1290 | |
root@mbed.org | 0:5e1631496985 | 1291 | outif = ip_route(addr); |
root@mbed.org | 0:5e1631496985 | 1292 | if ((outif != NULL) && (outif->mtu != 0)) { |
root@mbed.org | 0:5e1631496985 | 1293 | mss_s = outif->mtu - IP_HLEN - TCP_HLEN; |
root@mbed.org | 0:5e1631496985 | 1294 | /* RFC 1122, chap 4.2.2.6: |
root@mbed.org | 0:5e1631496985 | 1295 | * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize |
root@mbed.org | 0:5e1631496985 | 1296 | * We correct for TCP options in tcp_enqueue(), and don't support |
root@mbed.org | 0:5e1631496985 | 1297 | * IP options |
root@mbed.org | 0:5e1631496985 | 1298 | */ |
root@mbed.org | 0:5e1631496985 | 1299 | sendmss = LWIP_MIN(sendmss, mss_s); |
root@mbed.org | 0:5e1631496985 | 1300 | } |
root@mbed.org | 0:5e1631496985 | 1301 | return sendmss; |
root@mbed.org | 0:5e1631496985 | 1302 | } |
root@mbed.org | 0:5e1631496985 | 1303 | #endif /* TCP_CALCULATE_EFF_SEND_MSS */ |
root@mbed.org | 0:5e1631496985 | 1304 | |
root@mbed.org | 0:5e1631496985 | 1305 | const char* |
root@mbed.org | 0:5e1631496985 | 1306 | tcp_debug_state_str(enum tcp_state s) |
root@mbed.org | 0:5e1631496985 | 1307 | { |
root@mbed.org | 0:5e1631496985 | 1308 | return tcp_state_str[s]; |
root@mbed.org | 0:5e1631496985 | 1309 | } |
root@mbed.org | 0:5e1631496985 | 1310 | |
root@mbed.org | 0:5e1631496985 | 1311 | #if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG |
root@mbed.org | 0:5e1631496985 | 1312 | /** |
root@mbed.org | 0:5e1631496985 | 1313 | * Print a tcp header for debugging purposes. |
root@mbed.org | 0:5e1631496985 | 1314 | * |
root@mbed.org | 0:5e1631496985 | 1315 | * @param tcphdr pointer to a struct tcp_hdr |
root@mbed.org | 0:5e1631496985 | 1316 | */ |
root@mbed.org | 0:5e1631496985 | 1317 | void |
root@mbed.org | 0:5e1631496985 | 1318 | tcp_debug_print(struct tcp_hdr *tcphdr) |
root@mbed.org | 0:5e1631496985 | 1319 | { |
root@mbed.org | 0:5e1631496985 | 1320 | LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n")); |
root@mbed.org | 0:5e1631496985 | 1321 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n")); |
root@mbed.org | 0:5e1631496985 | 1322 | LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n", |
root@mbed.org | 0:5e1631496985 | 1323 | ntohs(tcphdr->src), ntohs(tcphdr->dest))); |
root@mbed.org | 0:5e1631496985 | 1324 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n")); |
root@mbed.org | 0:5e1631496985 | 1325 | LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n", |
root@mbed.org | 0:5e1631496985 | 1326 | ntohl(tcphdr->seqno))); |
root@mbed.org | 0:5e1631496985 | 1327 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n")); |
root@mbed.org | 0:5e1631496985 | 1328 | LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n", |
root@mbed.org | 0:5e1631496985 | 1329 | ntohl(tcphdr->ackno))); |
root@mbed.org | 0:5e1631496985 | 1330 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n")); |
root@mbed.org | 0:5e1631496985 | 1331 | LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (", |
root@mbed.org | 0:5e1631496985 | 1332 | TCPH_HDRLEN(tcphdr), |
root@mbed.org | 0:5e1631496985 | 1333 | TCPH_FLAGS(tcphdr) >> 5 & 1, |
root@mbed.org | 0:5e1631496985 | 1334 | TCPH_FLAGS(tcphdr) >> 4 & 1, |
root@mbed.org | 0:5e1631496985 | 1335 | TCPH_FLAGS(tcphdr) >> 3 & 1, |
root@mbed.org | 0:5e1631496985 | 1336 | TCPH_FLAGS(tcphdr) >> 2 & 1, |
root@mbed.org | 0:5e1631496985 | 1337 | TCPH_FLAGS(tcphdr) >> 1 & 1, |
root@mbed.org | 0:5e1631496985 | 1338 | TCPH_FLAGS(tcphdr) & 1, |
root@mbed.org | 0:5e1631496985 | 1339 | ntohs(tcphdr->wnd))); |
root@mbed.org | 0:5e1631496985 | 1340 | tcp_debug_print_flags(TCPH_FLAGS(tcphdr)); |
root@mbed.org | 0:5e1631496985 | 1341 | LWIP_DEBUGF(TCP_DEBUG, ("), win)\n")); |
root@mbed.org | 0:5e1631496985 | 1342 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n")); |
root@mbed.org | 0:5e1631496985 | 1343 | LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n", |
root@mbed.org | 0:5e1631496985 | 1344 | ntohs(tcphdr->chksum), ntohs(tcphdr->urgp))); |
root@mbed.org | 0:5e1631496985 | 1345 | LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n")); |
root@mbed.org | 0:5e1631496985 | 1346 | } |
root@mbed.org | 0:5e1631496985 | 1347 | |
root@mbed.org | 0:5e1631496985 | 1348 | /** |
root@mbed.org | 0:5e1631496985 | 1349 | * Print a tcp state for debugging purposes. |
root@mbed.org | 0:5e1631496985 | 1350 | * |
root@mbed.org | 0:5e1631496985 | 1351 | * @param s enum tcp_state to print |
root@mbed.org | 0:5e1631496985 | 1352 | */ |
root@mbed.org | 0:5e1631496985 | 1353 | void |
root@mbed.org | 0:5e1631496985 | 1354 | tcp_debug_print_state(enum tcp_state s) |
root@mbed.org | 0:5e1631496985 | 1355 | { |
root@mbed.org | 0:5e1631496985 | 1356 | LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s])); |
root@mbed.org | 0:5e1631496985 | 1357 | } |
root@mbed.org | 0:5e1631496985 | 1358 | |
root@mbed.org | 0:5e1631496985 | 1359 | /** |
root@mbed.org | 0:5e1631496985 | 1360 | * Print tcp flags for debugging purposes. |
root@mbed.org | 0:5e1631496985 | 1361 | * |
root@mbed.org | 0:5e1631496985 | 1362 | * @param flags tcp flags, all active flags are printed |
root@mbed.org | 0:5e1631496985 | 1363 | */ |
root@mbed.org | 0:5e1631496985 | 1364 | void |
root@mbed.org | 0:5e1631496985 | 1365 | tcp_debug_print_flags(u8_t flags) |
root@mbed.org | 0:5e1631496985 | 1366 | { |
root@mbed.org | 0:5e1631496985 | 1367 | if (flags & TCP_FIN) { |
root@mbed.org | 0:5e1631496985 | 1368 | LWIP_DEBUGF(TCP_DEBUG, ("FIN ")); |
root@mbed.org | 0:5e1631496985 | 1369 | } |
root@mbed.org | 0:5e1631496985 | 1370 | if (flags & TCP_SYN) { |
root@mbed.org | 0:5e1631496985 | 1371 | LWIP_DEBUGF(TCP_DEBUG, ("SYN ")); |
root@mbed.org | 0:5e1631496985 | 1372 | } |
root@mbed.org | 0:5e1631496985 | 1373 | if (flags & TCP_RST) { |
root@mbed.org | 0:5e1631496985 | 1374 | LWIP_DEBUGF(TCP_DEBUG, ("RST ")); |
root@mbed.org | 0:5e1631496985 | 1375 | } |
root@mbed.org | 0:5e1631496985 | 1376 | if (flags & TCP_PSH) { |
root@mbed.org | 0:5e1631496985 | 1377 | LWIP_DEBUGF(TCP_DEBUG, ("PSH ")); |
root@mbed.org | 0:5e1631496985 | 1378 | } |
root@mbed.org | 0:5e1631496985 | 1379 | if (flags & TCP_ACK) { |
root@mbed.org | 0:5e1631496985 | 1380 | LWIP_DEBUGF(TCP_DEBUG, ("ACK ")); |
root@mbed.org | 0:5e1631496985 | 1381 | } |
root@mbed.org | 0:5e1631496985 | 1382 | if (flags & TCP_URG) { |
root@mbed.org | 0:5e1631496985 | 1383 | LWIP_DEBUGF(TCP_DEBUG, ("URG ")); |
root@mbed.org | 0:5e1631496985 | 1384 | } |
root@mbed.org | 0:5e1631496985 | 1385 | if (flags & TCP_ECE) { |
root@mbed.org | 0:5e1631496985 | 1386 | LWIP_DEBUGF(TCP_DEBUG, ("ECE ")); |
root@mbed.org | 0:5e1631496985 | 1387 | } |
root@mbed.org | 0:5e1631496985 | 1388 | if (flags & TCP_CWR) { |
root@mbed.org | 0:5e1631496985 | 1389 | LWIP_DEBUGF(TCP_DEBUG, ("CWR ")); |
root@mbed.org | 0:5e1631496985 | 1390 | } |
root@mbed.org | 0:5e1631496985 | 1391 | LWIP_DEBUGF(TCP_DEBUG, ("\n")); |
root@mbed.org | 0:5e1631496985 | 1392 | } |
root@mbed.org | 0:5e1631496985 | 1393 | |
root@mbed.org | 0:5e1631496985 | 1394 | /** |
root@mbed.org | 0:5e1631496985 | 1395 | * Print all tcp_pcbs in every list for debugging purposes. |
root@mbed.org | 0:5e1631496985 | 1396 | */ |
root@mbed.org | 0:5e1631496985 | 1397 | void |
root@mbed.org | 0:5e1631496985 | 1398 | tcp_debug_print_pcbs(void) |
root@mbed.org | 0:5e1631496985 | 1399 | { |
root@mbed.org | 0:5e1631496985 | 1400 | struct tcp_pcb *pcb; |
root@mbed.org | 0:5e1631496985 | 1401 | LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n")); |
root@mbed.org | 0:5e1631496985 | 1402 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 1403 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ", |
root@mbed.org | 0:5e1631496985 | 1404 | pcb->local_port, pcb->remote_port, |
root@mbed.org | 0:5e1631496985 | 1405 | pcb->snd_nxt, pcb->rcv_nxt)); |
root@mbed.org | 0:5e1631496985 | 1406 | tcp_debug_print_state(pcb->state); |
root@mbed.org | 0:5e1631496985 | 1407 | } |
root@mbed.org | 0:5e1631496985 | 1408 | LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n")); |
root@mbed.org | 0:5e1631496985 | 1409 | for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 1410 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ", |
root@mbed.org | 0:5e1631496985 | 1411 | pcb->local_port, pcb->remote_port, |
root@mbed.org | 0:5e1631496985 | 1412 | pcb->snd_nxt, pcb->rcv_nxt)); |
root@mbed.org | 0:5e1631496985 | 1413 | tcp_debug_print_state(pcb->state); |
root@mbed.org | 0:5e1631496985 | 1414 | } |
root@mbed.org | 0:5e1631496985 | 1415 | LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n")); |
root@mbed.org | 0:5e1631496985 | 1416 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 1417 | LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ", |
root@mbed.org | 0:5e1631496985 | 1418 | pcb->local_port, pcb->remote_port, |
root@mbed.org | 0:5e1631496985 | 1419 | pcb->snd_nxt, pcb->rcv_nxt)); |
root@mbed.org | 0:5e1631496985 | 1420 | tcp_debug_print_state(pcb->state); |
root@mbed.org | 0:5e1631496985 | 1421 | } |
root@mbed.org | 0:5e1631496985 | 1422 | } |
root@mbed.org | 0:5e1631496985 | 1423 | |
root@mbed.org | 0:5e1631496985 | 1424 | /** |
root@mbed.org | 0:5e1631496985 | 1425 | * Check state consistency of the tcp_pcb lists. |
root@mbed.org | 0:5e1631496985 | 1426 | */ |
root@mbed.org | 0:5e1631496985 | 1427 | s16_t |
root@mbed.org | 0:5e1631496985 | 1428 | tcp_pcbs_sane(void) |
root@mbed.org | 0:5e1631496985 | 1429 | { |
root@mbed.org | 0:5e1631496985 | 1430 | struct tcp_pcb *pcb; |
root@mbed.org | 0:5e1631496985 | 1431 | for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 1432 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED); |
root@mbed.org | 0:5e1631496985 | 1433 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN); |
root@mbed.org | 0:5e1631496985 | 1434 | LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT); |
root@mbed.org | 0:5e1631496985 | 1435 | } |
root@mbed.org | 0:5e1631496985 | 1436 | for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) { |
root@mbed.org | 0:5e1631496985 | 1437 | LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT); |
root@mbed.org | 0:5e1631496985 | 1438 | } |
root@mbed.org | 0:5e1631496985 | 1439 | return 1; |
root@mbed.org | 0:5e1631496985 | 1440 | } |
root@mbed.org | 0:5e1631496985 | 1441 | #endif /* TCP_DEBUG */ |
root@mbed.org | 0:5e1631496985 | 1442 | |
root@mbed.org | 0:5e1631496985 | 1443 | #endif /* LWIP_TCP */ |