/**
* @file
* Transmission Control Protocol for IP
*
* This file contains common functions for the TCP implementation, such as functinos
* for manipulating the data structures and the TCP timer functions. TCP functions
* related to input and output is found in tcp_in.c and tcp_out.c respectively.
*
*/
/*
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/
#include "vma/lwip/opt.h"
#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
#include "vma/lwip/cc.h"
#include "vma/lwip/tcp.h"
#include "vma/lwip/tcp_impl.h"
#include "vma/lwip/stats.h"
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#if LWIP_3RD_PARTY_BUFS
tcp_tx_pbuf_alloc_fn external_tcp_tx_pbuf_alloc;
void register_tcp_tx_pbuf_alloc(tcp_tx_pbuf_alloc_fn fn)
{
external_tcp_tx_pbuf_alloc = fn;
}
tcp_tx_pbuf_free_fn external_tcp_tx_pbuf_free;
void register_tcp_tx_pbuf_free(tcp_tx_pbuf_free_fn fn)
{
external_tcp_tx_pbuf_free = fn;
}
tcp_seg_alloc_fn external_tcp_seg_alloc;
void register_tcp_seg_alloc(tcp_seg_alloc_fn fn)
{
external_tcp_seg_alloc = fn;
}
tcp_seg_free_fn external_tcp_seg_free;
void register_tcp_seg_free(tcp_seg_free_fn fn)
{
external_tcp_seg_free = fn;
}
#endif
/* allow user to be notified upon tcp_state changes */
tcp_state_observer_fn external_tcp_state_observer;
void register_tcp_state_observer(tcp_state_observer_fn fn)
{
external_tcp_state_observer = fn;
}
enum cc_algo_mod lwip_cc_algo_module = CC_MOD_LWIP;
u16_t lwip_tcp_mss = CONST_TCP_MSS;
u8_t enable_ts_option = 0;
/* slow timer value */
static u32_t slow_tmr_interval;
/* Incremented every coarse grained timer shot (typically every slow_tmr_interval ms). */
u32_t tcp_ticks = 0;
const u8_t tcp_backoff[13] =
{ 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
/* Times per slowtmr hits */
const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
/** Only used for temporary storage. */
struct tcp_pcb *tcp_tmp_pcb;
/**
*
* @param v value to set
*/
void
set_tmr_resolution(u32_t v)
{
slow_tmr_interval = v * 2;
}
/**
* Called periodically to dispatch TCP timers.
*
*/
void
tcp_tmr(struct tcp_pcb* pcb)
{
/* Call tcp_fasttmr() every (slow_tmr_interval / 2) ms */
tcp_fasttmr(pcb);
if (++(pcb->tcp_timer) & 1) {
/* Call tcp_tmr() every slow_tmr_interval ms, i.e., every other timer
tcp_tmr() is called. */
tcp_slowtmr(pcb);
}
}
/**
* Closes the TX side of a connection held by the PCB.
* For tcp_close(), a RST is sent if the application didn't receive all data
* (tcp_recved() not called for all data passed to recv callback).
*
* Listening pcbs are freed and may not be referenced any more.
* Connection pcbs are freed if not yet connected and may not be referenced
* any more. If a connection is established (at least SYN received or in
* a closing state), the connection is closed, and put in a closing state.
* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
* unsafe to reference it.
*
* @param pcb the tcp_pcb to close
* @return ERR_OK if connection has been closed
* another err_t if closing failed and pcb is not freed
*/
static err_t
tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
{
err_t err;
if (rst_on_unacked_data && ((get_tcp_state(pcb) == ESTABLISHED) || (get_tcp_state(pcb) == CLOSE_WAIT))) {
if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != pcb->rcv_wnd_max)) {
/* Not all data received by application, send RST to tell the remote
side about this. */
LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
/* don't call tcp_abort here: we must not deallocate the pcb since
that might not be expected when calling tcp_close */
tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, pcb->local_port, pcb->remote_port, pcb);
tcp_pcb_purge(pcb);
if (get_tcp_state(pcb) == ESTABLISHED) {
/* move to TIME_WAIT since we close actively */
set_tcp_state(pcb, TIME_WAIT);
} else {
/* CLOSE_WAIT: deallocate the pcb since we already sent a RST for it */
}
return ERR_OK;
}
}
switch (get_tcp_state(pcb)) {
case CLOSED:
/* Closing a pcb in the CLOSED state might seem erroneous,
* however, it is in this state once allocated and as yet unused
* and the user needs some way to free it should the need arise.
* Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
* or for a pcb that has been used and then entered the CLOSED state
* is erroneous, but this should never happen as the pcb has in those cases
* been freed, and so any remaining handles are bogus. */
err = ERR_OK;
pcb = NULL;
break;
case LISTEN:
err = ERR_OK;
tcp_pcb_remove(pcb);
pcb = NULL;
break;
case SYN_SENT:
err = ERR_OK;
tcp_pcb_remove(pcb);
pcb = NULL;
break;
case SYN_RCVD:
err = tcp_send_fin(pcb);
if (err == ERR_OK) {
set_tcp_state(pcb, FIN_WAIT_1);
}
break;
case ESTABLISHED:
err = tcp_send_fin(pcb);
if (err == ERR_OK) {
set_tcp_state(pcb, FIN_WAIT_1);
}
break;
case CLOSE_WAIT:
err = tcp_send_fin(pcb);
if (err == ERR_OK) {
set_tcp_state(pcb, LAST_ACK);
}
break;
default:
/* Has already been closed, do nothing. */
err = ERR_OK;
pcb = NULL;
break;
}
if (pcb != NULL && err == ERR_OK) {
/* To ensure all data has been sent when tcp_close returns, we have
to make sure tcp_output doesn't fail.
Since we don't really have to ensure all data has been sent when tcp_close
returns (unsent data is sent from tcp timer functions, also), we don't care
for the return value of tcp_output for now. */
/* @todo: When implementing SO_LINGER, this must be changed somehow:
If SOF_LINGER is set, the data should be sent and acked before close returns.
This can only be valid for sequential APIs, not for the raw API. */
tcp_output(pcb);
}
return err;
}
/**
* Closes the connection held by the PCB.
*
* Listening pcbs are freed and may not be referenced any more.
* Connection pcbs are freed if not yet connected and may not be referenced
* any more. If a connection is established (at least SYN received or in
* a closing state), the connection is closed, and put in a closing state.
* The pcb is then automatically freed in tcp_slowtmr(). It is therefore
* unsafe to reference it (unless an error is returned).
*
* @param pcb the tcp_pcb to close
* @return ERR_OK if connection has been closed
* another err_t if closing failed and pcb is not freed
*/
err_t
tcp_close(struct tcp_pcb *pcb)
{
#if TCP_DEBUG
LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
tcp_debug_print_state(get_tcp_state(pcb));
#endif /* TCP_DEBUG */
if (get_tcp_state(pcb) != LISTEN) {
/* Set a flag not to receive any more data... */
pcb->flags |= TF_RXCLOSED;
}
/* ... and close */
return tcp_close_shutdown(pcb, 1);
}
/**
* Causes all or part of a full-duplex connection of this PCB to be shut down.
* This doesn't deallocate the PCB!
*
* @param pcb PCB to shutdown
* @param shut_rx shut down receive side if this is != 0
* @param shut_tx shut down send side if this is != 0
* @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
* another err_t on error.
*/
err_t
tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
{
if (get_tcp_state(pcb) == LISTEN) {
return ERR_CONN;
}
if (shut_rx) {
/* shut down the receive side: set a flag not to receive any more data... */
pcb->flags |= TF_RXCLOSED;
if (shut_tx) {
/* shutting down the tx AND rx side is the same as closing for the raw API */
return tcp_close_shutdown(pcb, 1);
}
/* ... and free buffered data */
if (pcb->refused_data != NULL) {
pbuf_free(pcb->refused_data);
pcb->refused_data = NULL;
}
}
if (shut_tx) {
/* This can't happen twice since if it succeeds, the pcb's state is changed.
Only close in these states as the others directly deallocate the PCB */
switch (get_tcp_state(pcb)) {
case SYN_RCVD:
case ESTABLISHED:
case CLOSE_WAIT:
return tcp_close_shutdown(pcb, 0);
default:
/* Not (yet?) connected, cannot shutdown the TX side as that would bring us
into CLOSED state, where the PCB is deallocated. */
return ERR_CONN;
}
}
/* @todo: return another err_t if not in correct state or already shut? */
return ERR_OK;
}
/**
* Abandons a connection and optionally sends a RST to the remote
* host. Deletes the local protocol control block. This is done when
* a connection is killed because of shortage of memory.
*
* @param pcb the tcp_pcb to abort
* @param reset boolean to indicate whether a reset should be sent
*/
void
tcp_abandon(struct tcp_pcb *pcb, int reset)
{
u32_t seqno, ackno;
u16_t remote_port, local_port;
ip_addr_t remote_ip, local_ip;
#if LWIP_CALLBACK_API
tcp_err_fn errf;
#endif /* LWIP_CALLBACK_API */
void *errf_arg;
/* get_tcp_state(pcb) LISTEN not allowed here */
LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
get_tcp_state(pcb) != LISTEN);
/* Figure out on which TCP PCB list we are, and remove us. If we
are in an active state, call the receive function associated with
the PCB with a NULL argument, and send an RST to the remote end. */
if (get_tcp_state(pcb) == TIME_WAIT) {
tcp_pcb_remove(pcb);
} else {
int send_rst = reset && (get_tcp_state(pcb) != CLOSED);
seqno = pcb->snd_nxt;
ackno = pcb->rcv_nxt;
ip_addr_copy(local_ip, pcb->local_ip);
ip_addr_copy(remote_ip, pcb->remote_ip);
local_port = pcb->local_port;
remote_port = pcb->remote_port;
#if LWIP_CALLBACK_API
errf = pcb->errf;
#endif /* LWIP_CALLBACK_API */
errf_arg = pcb->my_container;
tcp_pcb_remove(pcb);
if (pcb->unacked != NULL) {
tcp_tx_segs_free(pcb, pcb->unacked);
pcb->unacked = NULL;
}
if (pcb->unsent != NULL) {
tcp_tx_segs_free(pcb, pcb->unsent);
pcb->unsent = NULL;
}
#if TCP_QUEUE_OOSEQ
if (pcb->ooseq != NULL) {
tcp_segs_free(pcb, pcb->ooseq);
}
#endif /* TCP_QUEUE_OOSEQ */
TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
if (send_rst) {
LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
tcp_rst(seqno, ackno, local_port, remote_port, pcb);
}
}
(void)local_ip; /* Fix warning -Wunused-but-set-variable */
(void)remote_ip; /* Fix warning -Wunused-but-set-variable */
}
/**
* Aborts the connection by sending a RST (reset) segment to the remote
* host. The pcb is deallocated. This function never fails.
*
* ATTENTION: When calling this from one of the TCP callbacks, make
* sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
* or you will risk accessing deallocated memory or memory leaks!
*
* @param pcb the tcp pcb to abort
*/
void
tcp_abort(struct tcp_pcb *pcb)
{
tcp_abandon(pcb, 1);
}
/**
* Binds the connection to a local portnumber and IP address. If the
* IP address is not given (i.e., ipaddr == NULL), the IP address of
* the outgoing network interface is used instead.
*
* @param pcb the tcp_pcb to bind (no check is done whether this pcb is
* already bound!)
* @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
* to any local address
* @param port the local port to bind to
* @return ERR_USE if the port is already in use
* ERR_OK if bound
*/
err_t
tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
{
LWIP_ERROR("tcp_bind: can only bind in state CLOSED", get_tcp_state(pcb) == CLOSED, return ERR_ISCONN);
if (!ip_addr_isany(ipaddr)) {
pcb->local_ip = *ipaddr;
}
pcb->local_port = port;
LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
return ERR_OK;
}
#if LWIP_CALLBACK_API
/**
* Default accept callback if no accept callback is specified by the user.
*/
static err_t
tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
{
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(pcb);
LWIP_UNUSED_ARG(err);
return ERR_ABRT;
}
#endif /* LWIP_CALLBACK_API */
/**
* Set the state of the connection to be LISTEN, which means that it
* is able to accept incoming connections.
*
* @param listen_pcb used for listening
* @param pcb the original tcp_pcb
* @return ERR_ISCONN if the conn_pcb is already in LISTEN state
* and ERR_OK on success
*
*/
err_t
tcp_listen(struct tcp_pcb_listen *listen_pcb, struct tcp_pcb *pcb)
{
/*
* LWIP_ERROR("tcp_listen: conn_pcb already connected", get_tcp_state(pcb) == CLOSED, ERR_ISCONN);
*/
/* already listening? */
if (!listen_pcb || (!pcb || get_tcp_state(pcb) == LISTEN)) {
return ERR_ISCONN;
}
listen_pcb->callback_arg = pcb->callback_arg;
listen_pcb->local_port = pcb->local_port;
set_tcp_state(listen_pcb, LISTEN);
listen_pcb->prio = pcb->prio;
listen_pcb->so_options = pcb->so_options;
listen_pcb->so_options |= SOF_ACCEPTCONN;
listen_pcb->ttl = pcb->ttl;
listen_pcb->tos = pcb->tos;
ip_addr_copy(listen_pcb->local_ip, pcb->local_ip);
#if LWIP_CALLBACK_API
listen_pcb->accept = tcp_accept_null;
#endif /* LWIP_CALLBACK_API */
return ERR_OK;
}
/**
* Update the state that tracks the available window space to advertise.
*
* Returns how much extra window would be advertised if we sent an
* update now.
*/
u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
{
u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((pcb->rcv_wnd_max / 2), pcb->mss))) {
/* we can advertise more window */
pcb->rcv_ann_wnd = pcb->rcv_wnd;
return new_right_edge - pcb->rcv_ann_right_edge;
} else {
if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
/* Can happen due to other end sending out of advertised window,
* but within actual available (but not yet advertised) window */
pcb->rcv_ann_wnd = 0;
} else {
/* keep the right edge of window constant */
u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff00", new_rcv_ann_wnd <= 0xffff00);
pcb->rcv_ann_wnd = new_rcv_ann_wnd;
}
return 0;
}
}
/**
* This function should be called by the application when it has
* processed the data. The purpose is to advertise a larger window
* when the data has been processed.
*
* @param pcb the tcp_pcb for which data is read
* @param len the amount of bytes that have been read by the application
*/
void
tcp_recved(struct tcp_pcb *pcb, u32_t len)
{
u32_t wnd_inflation;
LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
len <= 0xffffffffU - pcb->rcv_wnd );
pcb->rcv_wnd += len;
if (pcb->rcv_wnd > pcb->rcv_wnd_max) {
pcb->rcv_wnd = pcb->rcv_wnd_max;
} else if(pcb->rcv_wnd == 0) {
/* rcv_wnd overflowed */
if ((get_tcp_state(pcb) == CLOSE_WAIT) || (get_tcp_state(pcb) == LAST_ACK)) {
/* In passive close, we allow this, since the FIN bit is added to rcv_wnd
by the stack itself, since it is not mandatory for an application
to call tcp_recved() for the FIN bit, but e.g. the netconn API does so. */
pcb->rcv_wnd = pcb->rcv_wnd_max;
} else {
LWIP_ASSERT("tcp_recved: len wrapped rcv_wnd\n", 0);
}
}
wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
/* If the change in the right edge of window is significant (default
* watermark is TCP_WND/4), then send an explicit update now.
* Otherwise wait for a packet to be sent in the normal course of
* events (or more window to be available later) */
if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
tcp_ack_now(pcb);
tcp_output(pcb);
}
LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
len, pcb->rcv_wnd, TCP_WND_SCALED(pcb) - pcb->rcv_wnd));
}
/**
* Connects to another host. The function given as the "connected"
* argument will be called when the connection has been established.
*
* @param pcb the tcp_pcb used to establish the connection
* @param ipaddr the remote ip address to connect to
* @param port the remote tcp port to connect to
* @param connected callback function to call when connected (or on error)
* @return ERR_VAL if invalid arguments are given
* ERR_OK if connect request has been sent
* other err_t values if connect request couldn't be sent
*/
err_t
tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
tcp_connected_fn connected)
{
err_t ret;
u32_t iss;
LWIP_ERROR("tcp_connect: can only connected from state CLOSED", get_tcp_state(pcb) == CLOSED, return ERR_ISCONN);
LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
if (ipaddr != NULL) {
pcb->remote_ip = *ipaddr;
} else {
return ERR_VAL;
}
pcb->remote_port = port;
/* check if we have a route to the remote host */
if (ip_addr_isany(&(pcb->local_ip))) {
LWIP_ASSERT("tcp_connect: need to find route to host", 0);
}
if (pcb->local_port == 0) {
return ERR_VAL;
}
iss = tcp_next_iss();
pcb->rcv_nxt = 0;
pcb->snd_nxt = iss;
pcb->lastack = iss - 1;
pcb->snd_lbb = iss - 1;
pcb->rcv_ann_right_edge = pcb->rcv_nxt;
pcb->snd_wnd = TCP_WND;
/*
* For effective and advertized MSS without MTU consideration:
* If MSS is configured - do not accept a higher value than 536
* If MSS is not configured assume minimum value of 536
* The send MSS is updated when an MSS option is received
*/
u16_t snd_mss = pcb->advtsd_mss = (LWIP_TCP_MSS) ? ((LWIP_TCP_MSS > 536) ? 536 : LWIP_TCP_MSS) : 536;
UPDATE_PCB_BY_MSS(pcb, snd_mss);
#if TCP_CALCULATE_EFF_SEND_MSS
/*
* For advertized MSS with MTU knowledge - it is highly likely that it can be derived from the MTU towards the remote IP address.
* Otherwise (if unlikely MTU==0)
* If LWIP_TCP_MSS>0 use it as MSS
* If LWIP_TCP_MSS==0 set advertized MSS value to default 536
*/
pcb->advtsd_mss = (LWIP_TCP_MSS > 0) ? tcp_eff_send_mss(LWIP_TCP_MSS, pcb) : tcp_mss_follow_mtu_with_default(536, pcb);
/*
* For effective MSS with MTU knowledge - get the minimum between pcb->mss and the MSS derived from the
* MTU towards the remote IP address
* */
u16_t eff_mss = tcp_eff_send_mss(pcb->mss, pcb);
UPDATE_PCB_BY_MSS(pcb, eff_mss);
#endif /* TCP_CALCULATE_EFF_SEND_MSS */
pcb->cwnd = 1;
pcb->ssthresh = pcb->mss * 10;
pcb->connected = connected;
/* Send a SYN together with the MSS option. */
ret = tcp_enqueue_flags(pcb, TCP_SYN);
if (ret == ERR_OK) {
/* SYN segment was enqueued, changed the pcbs state now */
set_tcp_state(pcb, SYN_SENT);
tcp_output(pcb);
}
return ret;
}
/**
* Called every slow_tmr_interval ms and implements the retransmission timer and the timer that
* closes the psb if it in TIME_WAIT state for enough time. It also increments
* various timers such as the inactivity timer in PCB.
*
* Automatically called from tcp_tmr().
*/
void
tcp_slowtmr(struct tcp_pcb* pcb)
{
#if !TCP_CC_ALGO_MOD
u32_t eff_wnd;
#endif //!TCP_CC_ALGO_MOD
u8_t pcb_remove; /* flag if a PCB should be removed */
u8_t pcb_reset; /* flag if a RST should be sent when removing */
err_t err;
err = ERR_OK;
if (pcb == NULL) {
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
}
if (pcb && PCB_IN_ACTIVE_STATE(pcb)) {
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
LWIP_ASSERT("tcp_slowtmr: active get_tcp_state(pcb) != CLOSED\n", get_tcp_state(pcb) != CLOSED);
LWIP_ASSERT("tcp_slowtmr: active get_tcp_state(pcb) != LISTEN\n", get_tcp_state(pcb) != LISTEN);
LWIP_ASSERT("tcp_slowtmr: active get_tcp_state(pcb) != TIME-WAIT\n", get_tcp_state(pcb) != TIME_WAIT);
pcb_remove = 0;
pcb_reset = 0;
if (get_tcp_state(pcb) == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
++pcb_remove;
err = ERR_TIMEOUT;
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
}
else if (pcb->nrtx == TCP_MAXRTX) {
++pcb_remove;
err = ERR_ABRT;
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
} else {
if (pcb->persist_backoff > 0) {
/* If snd_wnd is zero and pcb->unacked is NULL , use persist timer to send 1 byte probes
* instead of using the standard retransmission mechanism. */
pcb->persist_cnt++;
if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
pcb->persist_cnt = 0;
if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
pcb->persist_backoff++;
}
/* Use tcp_keepalive() instead of tcp_zero_window_probe() to probe for window update
* without sending any data (which will force us to split the segment).
* tcp_zero_window_probe(pcb); */
tcp_keepalive(pcb);
}
} else {
/* Increase the retransmission timer if it is running */
if(pcb->rtime >= 0)
++pcb->rtime;
if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
/* Time for a retransmission. */
LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
" pcb->rto %"S16_F"\n",
pcb->rtime, pcb->rto));
/* Double retransmission time-out unless we are trying to
* connect to somebody (i.e., we are in SYN_SENT). */
if (get_tcp_state(pcb) != SYN_SENT) {
pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
}
/* Reset the retransmission timer. */
pcb->rtime = 0;
#if TCP_CC_ALGO_MOD
cc_cong_signal(pcb, CC_RTO);
#else
/* Reduce congestion window and ssthresh. */
eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
pcb->ssthresh = eff_wnd >> 1;
if (pcb->ssthresh < (u32_t)(pcb->mss << 1)) {
pcb->ssthresh = (pcb->mss << 1);
}
pcb->cwnd = pcb->mss;
#endif
LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
" ssthresh %"U16_F"\n",
pcb->cwnd, pcb->ssthresh));
/* The following needs to be called AFTER cwnd is set to one
mss - STJ */
tcp_rexmit_rto(pcb);
}
}
}
/* Check if this PCB has stayed too long in FIN-WAIT-2 */
if (get_tcp_state(pcb) == FIN_WAIT_2) {
/* If this PCB is in FIN_WAIT_2 because of SHUT_WR don't let it time out. */
if (pcb->flags & TF_RXCLOSED) {
/* PCB was fully closed (either through close() or SHUT_RDWR):
normal FIN-WAIT timeout handling. */
if ((u32_t)(tcp_ticks - pcb->tmr) >
TCP_FIN_WAIT_TIMEOUT / slow_tmr_interval) {
++pcb_remove;
err = ERR_ABRT;
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
}
}
}
/* Check if KEEPALIVE should be sent */
if((pcb->so_options & SOF_KEEPALIVE) &&
((get_tcp_state(pcb) == ESTABLISHED) ||
(get_tcp_state(pcb) == CLOSE_WAIT))) {
#if LWIP_TCP_KEEPALIVE
if((u32_t)(tcp_ticks - pcb->tmr) >
(pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
/ slow_tmr_interval)
#else
if((u32_t)(tcp_ticks - pcb->tmr) >
(pcb->keep_idle + TCP_MAXIDLE) / slow_tmr_interval)
#endif /* LWIP_TCP_KEEPALIVE */
{
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
++pcb_remove;
err = ERR_ABRT;
++pcb_reset;
}
#if LWIP_TCP_KEEPALIVE
else if((u32_t)(tcp_ticks - pcb->tmr) >
(pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
/ slow_tmr_interval)
#else
else if((u32_t)(tcp_ticks - pcb->tmr) >
(pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
/ slow_tmr_interval)
#endif /* LWIP_TCP_KEEPALIVE */
{
tcp_keepalive(pcb);
pcb->keep_cnt_sent++;
}
}
/* If this PCB has queued out of sequence data, but has been
inactive for too long, will drop the data (it will eventually
be retransmitted). */
#if TCP_QUEUE_OOSEQ
if (pcb->ooseq != NULL &&
(u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
tcp_segs_free(pcb, pcb->ooseq);
pcb->ooseq = NULL;
LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
}
#endif /* TCP_QUEUE_OOSEQ */
/* Check if this PCB has stayed too long in SYN-RCVD */
if (get_tcp_state(pcb) == SYN_RCVD) {
if ((u32_t)(tcp_ticks - pcb->tmr) >
TCP_SYN_RCVD_TIMEOUT / slow_tmr_interval) {
++pcb_remove;
err = ERR_ABRT;
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
}
}
/* Check if this PCB has stayed too long in LAST-ACK */
if (get_tcp_state(pcb) == LAST_ACK) {
if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / slow_tmr_interval) {
++pcb_remove;
err = ERR_ABRT;
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
}
}
/* If the PCB should be removed, do it. */
if (pcb_remove) {
tcp_pcb_purge(pcb);
TCP_EVENT_ERR(pcb->errf, pcb->my_container, err);
if (pcb_reset) {
tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, pcb->local_port, pcb->remote_port, pcb);
}
set_tcp_state(pcb, CLOSED);
} else {
/* We check if we should poll the connection. */
++pcb->polltmr;
if (pcb->polltmr >= pcb->pollinterval) {
pcb->polltmr = 0;
LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
TCP_EVENT_POLL(pcb, err);
/* if err == ERR_ABRT, 'prev' is already deallocated */
if (err == ERR_OK) {
tcp_output(pcb);
}
}
}
}
if (pcb && PCB_IN_TIME_WAIT_STATE(pcb)) {
LWIP_ASSERT("tcp_slowtmr: TIME-WAIT get_tcp_state(pcb) == TIME-WAIT", get_tcp_state(pcb) == TIME_WAIT);
pcb_remove = 0;
/* Check if this PCB has stayed long enough in TIME-WAIT */
if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / slow_tmr_interval) {
++pcb_remove;
/* err = ERR_ABRT; */ /* Note: suppress warning 'err' is never read */
}
/* If the PCB should be removed, do it. */
if (pcb_remove) {
tcp_pcb_purge(pcb);
set_tcp_state(pcb, CLOSED);
}
}
}
/**
* Is called every slow_tmr_interval and process data previously
* "refused" by upper layer (application) and sends delayed ACKs.
*
* Automatically called from tcp_tmr().
*/
void
tcp_fasttmr(struct tcp_pcb* pcb)
{
if(pcb != NULL && PCB_IN_ACTIVE_STATE(pcb)) {
/* If there is data which was previously "refused" by upper layer */
while (pcb->refused_data != NULL) { // 'while' instead of 'if' because windows scale uses large pbuf
struct pbuf *rest;
/* Notify again application with data previously received. */
err_t err;
pbuf_split_64k(pcb->refused_data, &rest);
LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
if (err == ERR_OK) {
pcb->refused_data = rest;
} else {
if (rest) {
pbuf_cat(pcb->refused_data, rest); /* undo splitting */
}
if (err == ERR_ABRT) {
/* if err == ERR_ABRT, 'pcb' is already deallocated */
pcb = NULL;
}
break;
}
}
/* send delayed ACKs */
if (pcb && (pcb->flags & TF_ACK_DELAY)) {
LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
tcp_ack_now(pcb);
tcp_output(pcb);
pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
}
}
}
/**
* Deallocates a list of TCP segments (tcp_seg structures).
*
* @param seg tcp_seg list of TCP segments to free
*/
void
tcp_segs_free(struct tcp_pcb *pcb, struct tcp_seg *seg)
{
while (seg != NULL) {
struct tcp_seg *next = seg->next;
seg->next = NULL;
tcp_seg_free(pcb, seg);
seg = next;
}
}
/**
* Frees a TCP segment (tcp_seg structure).
*
* @param seg single tcp_seg to free
*/
void
tcp_seg_free(struct tcp_pcb *pcb, struct tcp_seg *seg)
{
if (seg != NULL) {
if (seg->p != NULL) {
pbuf_free(seg->p);
#if TCP_DEBUG
seg->p = NULL;
#endif /* TCP_DEBUG */
}
external_tcp_seg_free(pcb, seg);
}
}
/**
* Deallocates a list of TCP segments (tcp_seg structures).
*
* @param seg tcp_seg list of TCP segments to free
*/
void
tcp_tx_segs_free(struct tcp_pcb * pcb, struct tcp_seg *seg)
{
while (seg != NULL) {
struct tcp_seg *next = seg->next;
seg->next = NULL;
tcp_tx_seg_free(pcb, seg);
seg = next;
}
}
/**
* Frees a TCP segment (tcp_seg structure).
*
* @param seg single tcp_seg to free
*/
void
tcp_tx_seg_free(struct tcp_pcb * pcb, struct tcp_seg *seg)
{
if (seg != NULL) {
if (seg->p != NULL) {
tcp_tx_pbuf_free(pcb, seg->p);
}
external_tcp_seg_free(pcb, seg);
}
}
#if TCP_QUEUE_OOSEQ
/**
* Returns a copy of the given TCP segment.
* The pbuf and data are not copied, only the pointers
*
* @param seg the old tcp_seg
* @return a copy of seg
*/
struct tcp_seg *
tcp_seg_copy(struct tcp_pcb* pcb, struct tcp_seg *seg)
{
struct tcp_seg *cseg;
cseg = external_tcp_seg_alloc(pcb);
if (cseg == NULL) {
return NULL;
}
SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
pbuf_ref(cseg->p);
return cseg;
}
#endif /* TCP_QUEUE_OOSEQ */
#if LWIP_CALLBACK_API
/**
* Default receive callback that is called if the user didn't register
* a recv callback for the pcb.
*/
err_t
tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
LWIP_UNUSED_ARG(arg);
if (p != NULL) {
tcp_recved(pcb, (u32_t)p->tot_len);
pbuf_free(p);
} else if (err == ERR_OK) {
return tcp_close(pcb);
}
return ERR_OK;
}
#endif /* LWIP_CALLBACK_API */
void tcp_pcb_init (struct tcp_pcb* pcb, u8_t prio)
{
u32_t iss;
memset(pcb, 0, sizeof(*pcb));
pcb->max_snd_buff = TCP_SND_BUF;
pcb->prio = prio;
pcb->snd_buf = pcb->max_snd_buff;
pcb->snd_queuelen = 0;
pcb->snd_scale = 0;
pcb->rcv_scale = 0;
pcb->rcv_wnd = TCP_WND_SCALED(pcb);
pcb->rcv_ann_wnd = TCP_WND_SCALED(pcb);
pcb->rcv_wnd_max = TCP_WND_SCALED(pcb);
pcb->rcv_wnd_max_desired = TCP_WND_SCALED(pcb);
pcb->tos = 0;
pcb->ttl = TCP_TTL;
/* As initial send MSS, we use TCP_MSS but limit it to 536.
The send MSS is updated when an MSS option is received. */
u16_t snd_mss = pcb->advtsd_mss = (LWIP_TCP_MSS) ? ((LWIP_TCP_MSS > 536) ? 536 : LWIP_TCP_MSS) : 536;
UPDATE_PCB_BY_MSS(pcb, snd_mss);
pcb->max_unsent_len = pcb->max_tcp_snd_queuelen;
pcb->rto = 3000 / slow_tmr_interval;
pcb->sa = 0;
pcb->sv = 3000 / slow_tmr_interval;
pcb->rtime = -1;
#if TCP_CC_ALGO_MOD
switch (lwip_cc_algo_module) {
case CC_MOD_CUBIC:
pcb->cc_algo = &cubic_cc_algo;
break;
case CC_MOD_NONE:
pcb->cc_algo = &none_cc_algo;
break;
case CC_MOD_LWIP:
default:
pcb->cc_algo = &lwip_cc_algo;
break;
}
cc_init(pcb);
#endif
pcb->cwnd = 1;
iss = tcp_next_iss();
pcb->snd_wl2 = iss;
pcb->snd_nxt = iss;
pcb->lastack = iss;
pcb->snd_lbb = iss;
pcb->tmr = tcp_ticks;
pcb->snd_sml_snt = 0;
pcb->snd_sml_add = 0;
pcb->polltmr = 0;
pcb->tcp_timer = 0;
#if LWIP_CALLBACK_API
pcb->recv = tcp_recv_null;
#endif /* LWIP_CALLBACK_API */
/* Init KEEPALIVE timer */
pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
#if LWIP_TCP_KEEPALIVE
pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
#endif /* LWIP_TCP_KEEPALIVE */
pcb->keep_cnt_sent = 0;
pcb->quickack = 0;
pcb->enable_ts_opt = enable_ts_option;
pcb->seg_alloc = NULL;
pcb->pbuf_alloc = NULL;
}
struct pbuf *
tcp_tx_pbuf_alloc(struct tcp_pcb * pcb, u16_t length, pbuf_type type)
{
struct pbuf * p;
if (!pcb->pbuf_alloc) {
// pbuf_alloc is not valid, we should allocate a new pbuf.
p = external_tcp_tx_pbuf_alloc(pcb);
if (!p) return NULL;
p->next = NULL;
p->type = type;
/* set reference count */
p->ref = 1;
/* set flags */
p->flags = 0;
} else {
// pbuf_alloc is valid, we dont need to allocate a new pbuf element.
p = pcb->pbuf_alloc;
pcb->pbuf_alloc = NULL;
}
/* Set up internal structure of the pbuf. */
p->len = p->tot_len = length;
return p;
}
// Release preallocated buffers
void tcp_tx_preallocted_buffers_free(struct tcp_pcb * pcb)
{
if (pcb->seg_alloc) {
tcp_tx_seg_free(pcb, pcb->seg_alloc);
pcb->seg_alloc = NULL;
}
if (pcb->pbuf_alloc) {
tcp_tx_pbuf_free(pcb, pcb->pbuf_alloc);
pcb->pbuf_alloc = NULL;
}
}
void
tcp_tx_pbuf_free(struct tcp_pcb * pcb, struct pbuf * p)
{
struct pbuf * p_next = NULL;
while (p) {
p_next = p->next;
p->next = NULL;
if (p->type == PBUF_RAM) {
external_tcp_tx_pbuf_free(pcb, p);
} else {
pbuf_free(p);
}
p = p_next;
}
}
/**
* Used to specify the argument that should be passed callback
* functions.
*
* @param pcb tcp_pcb to set the callback argument
* @param arg void pointer argument to pass to callback functions
*/
void
tcp_arg(struct tcp_pcb *pcb, void *arg)
{
pcb->callback_arg = arg;
}
#if LWIP_CALLBACK_API
/**
* Used to specify the function that should be called when a TCP
* connection receives data.
*
* @param pcb tcp_pcb to set the recv callback
* @param recv callback function to call for this pcb when data is received
*/
void
tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
{
pcb->recv = recv;
}
/**
* Used to specify the function that should be called when TCP data
* has been successfully delivered to the remote host.
*
* @param pcb tcp_pcb to set the sent callback
* @param sent callback function to call for this pcb when data is successfully sent
*/
void
tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
{
pcb->sent = sent;
}
/**
* Used to specify the function that should be called when a fatal error
* has occured on the connection.
*
* @param pcb tcp_pcb to set the err callback
* @param err callback function to call for this pcb when a fatal error
* has occured on the connection
*/
void
tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
{
pcb->errf = err;
}
/**
* Used for specifying the function that should be called when a
* LISTENing connection has been connected to another host.
*
* @param pcb tcp_pcb to set the accept callback
* @param accept callback function to call for this pcb when LISTENing
* connection has been connected to another host
*/
void
tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
{
pcb->accept = accept;
}
/**
* Used for specifying the function that should be called
* for sending packets.
*
* @param pcb tcp_pcb to set the outputcallback
* @param output callback function
*/
void
tcp_ip_output(struct tcp_pcb *pcb, ip_output_fn ip_output)
{
pcb->ip_output = ip_output;
}
/**
* Used for specifying the function that should be called when a
* SYN was received.
*
* @param pcb tcp_pcb to set the accept callback
* @param accept callback function to call for this pcb when SYN
* is received
*/
void
tcp_syn_handled(struct tcp_pcb_listen *pcb, tcp_syn_handled_fn syn_handled)
{
pcb->syn_handled_cb = syn_handled;
}
/**
* Used for specifying the function that should be called to clone pcb
*
* @param listen pcb to clone
* @param clone callback function to call in order to clone the pcb
*/
void
tcp_clone_conn(struct tcp_pcb_listen *pcb, tcp_clone_conn_fn clone_conn)
{
pcb->clone_conn = clone_conn;
}
#endif /* LWIP_CALLBACK_API */
/**
* Used to specify the function that should be called periodically
* from TCP. The interval is specified in terms of the TCP coarse
* timer interval, which is called twice a second.
*
*/
void
tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
{
#if LWIP_CALLBACK_API
pcb->poll = poll;
#else /* LWIP_CALLBACK_API */
LWIP_UNUSED_ARG(poll);
#endif /* LWIP_CALLBACK_API */
pcb->pollinterval = interval;
}
/**
* Purges a TCP PCB. Removes any buffered data and frees the buffer memory
* (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
*
* @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
*/
void
tcp_pcb_purge(struct tcp_pcb *pcb)
{
if (get_tcp_state(pcb) != CLOSED &&
get_tcp_state(pcb) != TIME_WAIT &&
get_tcp_state(pcb) != LISTEN) {
LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
if (pcb->refused_data != NULL) {
LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
pbuf_free(pcb->refused_data);
pcb->refused_data = NULL;
}
if (pcb->unsent != NULL) {
LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
}
if (pcb->unacked != NULL) {
LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
}
#if TCP_QUEUE_OOSEQ
if (pcb->ooseq != NULL) {
LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
}
tcp_segs_free(pcb, pcb->ooseq);
pcb->ooseq = NULL;
#endif /* TCP_QUEUE_OOSEQ */
/* Stop the retransmission timer as it will expect data on unacked
queue if it fires */
pcb->rtime = -1;
tcp_tx_segs_free(pcb, pcb->unsent);
tcp_tx_segs_free(pcb, pcb->unacked);
pcb->unacked = pcb->unsent = NULL;
#if TCP_OVERSIZE
pcb->unsent_oversize = 0;
#endif /* TCP_OVERSIZE */
#if TCP_CC_ALGO_MOD
cc_destroy(pcb);
#endif
}
}
/**
* Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
*
* @param pcblist PCB list to purge.
* @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
*/
void
tcp_pcb_remove(struct tcp_pcb *pcb)
{
tcp_pcb_purge(pcb);
/* if there is an outstanding delayed ACKs, send it */
if (get_tcp_state(pcb) != TIME_WAIT &&
get_tcp_state(pcb) != LISTEN &&
pcb->flags & TF_ACK_DELAY) {
pcb->flags |= TF_ACK_NOW;
tcp_output(pcb);
}
if (get_tcp_state(pcb) != LISTEN) {
LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
#if TCP_QUEUE_OOSEQ
LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
#endif /* TCP_QUEUE_OOSEQ */
}
set_tcp_state(pcb, CLOSED);
LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
}
/**
* Calculates a new initial sequence number for new connections.
*
* @return u32_t pseudo random sequence number
*/
u32_t
tcp_next_iss(void)
{
static u32_t iss = 6510;
iss += tcp_ticks; /* XXX */
return iss;
}
#if TCP_CALCULATE_EFF_SEND_MSS
/**
* Calcluates the effective send mss that can be used for a specific IP address
* by using ip_route to determine the netif used to send to the address and
* calculating the minimum of TCP_MSS and that netif's mtu (if set).
*/
u16_t
tcp_eff_send_mss(u16_t sendmss, struct tcp_pcb *pcb)
{
u16_t mtu;
mtu = external_ip_route_mtu(pcb);
if (mtu != 0) {
sendmss = LWIP_MIN(sendmss, mtu - IP_HLEN - TCP_HLEN);
}
return sendmss;
}
/**
* Calcluates the send mss that can be used for a specific IP address
* by using ip_route to determine the netif used to send to the address.
* In case MTU is unkonw - return the default MSS
*/
u16_t
tcp_mss_follow_mtu_with_default(u16_t defsendmss, struct tcp_pcb *pcb)
{
u16_t mtu;
mtu = external_ip_route_mtu(pcb);
if (mtu != 0) {
defsendmss = mtu - IP_HLEN - TCP_HLEN;
defsendmss = LWIP_MAX(defsendmss, 1); /* MSS must be a positive number */
}
return defsendmss;
}
#endif /* TCP_CALCULATE_EFF_SEND_MSS */
#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
/**
* Print a tcp header for debugging purposes.
*
* @param tcphdr pointer to a struct tcp_hdr
*/
void
tcp_debug_print(struct tcp_hdr *tcphdr)
{
LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
ntohs(tcphdr->src), ntohs(tcphdr->dest)));
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
ntohl(tcphdr->seqno)));
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
ntohl(tcphdr->ackno)));
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
TCPH_HDRLEN(tcphdr),
TCPH_FLAGS(tcphdr) >> 5 & 1,
TCPH_FLAGS(tcphdr) >> 4 & 1,
TCPH_FLAGS(tcphdr) >> 3 & 1,
TCPH_FLAGS(tcphdr) >> 2 & 1,
TCPH_FLAGS(tcphdr) >> 1 & 1,
TCPH_FLAGS(tcphdr) & 1,
ntohs(tcphdr->wnd)));
tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
}
/**
* Print a tcp state for debugging purposes.
*
* @param s enum tcp_state to print
*/
void
tcp_debug_print_state(enum tcp_state s)
{
LWIP_UNUSED_ARG(s);
LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
}
/**
* Print tcp flags for debugging purposes.
*
* @param flags tcp flags, all active flags are printed
*/
void
tcp_debug_print_flags(u8_t flags)
{
if (flags & TCP_FIN) {
LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
}
if (flags & TCP_SYN) {
LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
}
if (flags & TCP_RST) {
LWIP_DEBUGF(TCP_DEBUG, ("RST "));
}
if (flags & TCP_PSH) {
LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
}
if (flags & TCP_ACK) {
LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
}
if (flags & TCP_URG) {
LWIP_DEBUGF(TCP_DEBUG, ("URG "));
}
if (flags & TCP_ECE) {
LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
}
if (flags & TCP_CWR) {
LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
}
LWIP_DEBUGF(TCP_DEBUG, ("\n"));
}
/**
* Print all tcp_pcbs in every list for debugging purposes.
*/
void
tcp_debug_print_pcbs(void)
{
LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states: REMOVED\n"));
}
#endif /* TCP_DEBUG */
#endif /* LWIP_TCP */