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/**
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* @file
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* Transmission Control Protocol, outgoing traffic
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*
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* The output functions of TCP.
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*
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/tcp_impl.h"
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/memp.h"
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#include "lwip/sys.h"
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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#include "lwip/inet_chksum.h"
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#include "lwip/stats.h"
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#include "lwip/snmp.h"
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#include <string.h>
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/* Define some copy-macros for checksum-on-copy so that the code looks
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nicer by preventing too many ifdef's. */
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#if TCP_CHECKSUM_ON_COPY
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#define TCP_DATA_COPY(dst, src, len, seg) do { \
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tcp_seg_add_chksum(LWIP_CHKSUM_COPY(dst, src, len), \
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len, &seg->chksum, &seg->chksum_swapped); \
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seg->flags |= TF_SEG_DATA_CHECKSUMMED; } while(0)
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#define TCP_DATA_COPY2(dst, src, len, chksum, chksum_swapped) \
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tcp_seg_add_chksum(LWIP_CHKSUM_COPY(dst, src, len), len, chksum, chksum_swapped);
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#else /* TCP_CHECKSUM_ON_COPY*/
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#define TCP_DATA_COPY(dst, src, len, seg) MEMCPY(dst, src, len)
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#define TCP_DATA_COPY2(dst, src, len, chksum, chksum_swapped) MEMCPY(dst, src, len)
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#endif /* TCP_CHECKSUM_ON_COPY*/
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/** Define this to 1 for an extra check that the output checksum is valid
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* (usefule when the checksum is generated by the application, not the stack) */
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#ifndef TCP_CHECKSUM_ON_COPY_SANITY_CHECK
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#define TCP_CHECKSUM_ON_COPY_SANITY_CHECK 0
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#endif
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/* Forward declarations.*/
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static void tcp_output_segment(struct tcp_seg *seg, struct tcp_pcb *pcb);
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/** Allocate a pbuf and create a tcphdr at p->payload, used for output
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* functions other than the default tcp_output -> tcp_output_segment
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* (e.g. tcp_send_empty_ack, etc.)
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*
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* @param pcb tcp pcb for which to send a packet (used to initialize tcp_hdr)
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* @param optlen length of header-options
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* @param datalen length of tcp data to reserve in pbuf
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* @param seqno_be seqno in network byte order (big-endian)
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* @return pbuf with p->payload being the tcp_hdr
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*/
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static struct pbuf *
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tcp_output_alloc_header(struct tcp_pcb *pcb, u16_t optlen, u16_t datalen,
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u32_t seqno_be /* already in network byte order */)
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{
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struct tcp_hdr *tcphdr;
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struct pbuf *p = pbuf_alloc(PBUF_IP, TCP_HLEN + optlen + datalen, PBUF_RAM);
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if (p != NULL) {
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LWIP_ASSERT("check that first pbuf can hold struct tcp_hdr",
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(p->len >= TCP_HLEN + optlen));
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tcphdr = (struct tcp_hdr *)p->payload;
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tcphdr->src = htons(pcb->local_port);
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tcphdr->dest = htons(pcb->remote_port);
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tcphdr->seqno = seqno_be;
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tcphdr->ackno = htonl(pcb->rcv_nxt);
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TCPH_HDRLEN_FLAGS_SET(tcphdr, (5 + optlen / 4), TCP_ACK);
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tcphdr->wnd = htons(pcb->rcv_ann_wnd);
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tcphdr->chksum = 0;
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tcphdr->urgp = 0;
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/* If we're sending a packet, update the announced right window edge */
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pcb->rcv_ann_right_edge = pcb->rcv_nxt + pcb->rcv_ann_wnd;
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}
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return p;
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}
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/**
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* Called by tcp_close() to send a segment including FIN flag but not data.
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*
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* @param pcb the tcp_pcb over which to send a segment
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* @return ERR_OK if sent, another err_t otherwise
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*/
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err_t
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tcp_send_fin(struct tcp_pcb *pcb)
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{
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/* first, try to add the fin to the last unsent segment */
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if (pcb->unsent != NULL) {
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struct tcp_seg *last_unsent;
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for (last_unsent = pcb->unsent; last_unsent->next != NULL;
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last_unsent = last_unsent->next);
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if ((TCPH_FLAGS(last_unsent->tcphdr) & (TCP_SYN | TCP_FIN | TCP_RST)) == 0) {
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/* no SYN/FIN/RST flag in the header, we can add the FIN flag */
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TCPH_SET_FLAG(last_unsent->tcphdr, TCP_FIN);
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return ERR_OK;
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}
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}
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/* no data, no length, flags, copy=1, no optdata */
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return tcp_enqueue_flags(pcb, TCP_FIN);
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}
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/**
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* Create a TCP segment with prefilled header.
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*
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* Called by tcp_write and tcp_enqueue_flags.
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*
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* @param pcb Protocol control block for the TCP connection.
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* @param p pbuf that is used to hold the TCP header.
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* @param flags TCP flags for header.
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* @param seqno TCP sequence number of this packet
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* @param optflags options to include in TCP header
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* @return a new tcp_seg pointing to p, or NULL.
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* The TCP header is filled in except ackno and wnd.
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* p is freed on failure.
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*/
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static struct tcp_seg *
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tcp_create_segment(struct tcp_pcb *pcb, struct pbuf *p, u8_t flags, u32_t seqno, u8_t optflags)
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{
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struct tcp_seg *seg;
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u8_t optlen = LWIP_TCP_OPT_LENGTH(optflags);
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if ((seg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG)) == NULL) {
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LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_create_segment: no memory.\n"));
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pbuf_free(p);
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return NULL;
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}
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seg->flags = optflags;
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seg->next = NULL;
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seg->p = p;
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seg->dataptr = p->payload;
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seg->len = p->tot_len - optlen;
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#if TCP_OVERSIZE_DBGCHECK
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seg->oversize_left = 0;
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#endif /* TCP_OVERSIZE_DBGCHECK */
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#if TCP_CHECKSUM_ON_COPY
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seg->chksum = 0;
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seg->chksum_swapped = 0;
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/* check optflags */
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LWIP_ASSERT("invalid optflags passed: TF_SEG_DATA_CHECKSUMMED",
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(optflags & TF_SEG_DATA_CHECKSUMMED) == 0);
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#endif /* TCP_CHECKSUM_ON_COPY */
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/* build TCP header */
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if (pbuf_header(p, TCP_HLEN)) {
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LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_create_segment: no room for TCP header in pbuf.\n"));
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TCP_STATS_INC(tcp.err);
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tcp_seg_free(seg);
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return NULL;
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}
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seg->tcphdr = (struct tcp_hdr *)seg->p->payload;
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seg->tcphdr->src = htons(pcb->local_port);
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seg->tcphdr->dest = htons(pcb->remote_port);
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seg->tcphdr->seqno = htonl(seqno);
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/* ackno is set in tcp_output */
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TCPH_HDRLEN_FLAGS_SET(seg->tcphdr, (5 + optlen / 4), flags);
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/* wnd and chksum are set in tcp_output */
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seg->tcphdr->urgp = 0;
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return seg;
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}
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199
|
|
mbed714 |
0:d616ece2d859
|
200
|
/**
|
mbed714 |
0:d616ece2d859
|
201
|
* Allocate a PBUF_RAM pbuf, perhaps with extra space at the end.
|
mbed714 |
0:d616ece2d859
|
202
|
*
|
mbed714 |
0:d616ece2d859
|
203
|
* This function is like pbuf_alloc(layer, length, PBUF_RAM) except
|
mbed714 |
0:d616ece2d859
|
204
|
* there may be extra bytes available at the end.
|
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0:d616ece2d859
|
205
|
*
|
mbed714 |
0:d616ece2d859
|
206
|
* @param layer flag to define header size.
|
mbed714 |
0:d616ece2d859
|
207
|
* @param length size of the pbuf's payload.
|
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0:d616ece2d859
|
208
|
* @param max_length maximum usable size of payload+oversize.
|
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0:d616ece2d859
|
209
|
* @param oversize pointer to a u16_t that will receive the number of usable tail bytes.
|
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0:d616ece2d859
|
210
|
* @param pcb The TCP connection that willo enqueue the pbuf.
|
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0:d616ece2d859
|
211
|
* @param apiflags API flags given to tcp_write.
|
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0:d616ece2d859
|
212
|
* @param first_seg true when this pbuf will be used in the first enqueued segment.
|
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0:d616ece2d859
|
213
|
* @param
|
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0:d616ece2d859
|
214
|
*/
|
mbed714 |
0:d616ece2d859
|
215
|
#if TCP_OVERSIZE
|
mbed714 |
0:d616ece2d859
|
216
|
static struct pbuf *
|
mbed714 |
0:d616ece2d859
|
217
|
tcp_pbuf_prealloc(pbuf_layer layer, u16_t length, u16_t max_length,
|
mbed714 |
0:d616ece2d859
|
218
|
u16_t *oversize, struct tcp_pcb *pcb, u8_t apiflags,
|
mbed714 |
0:d616ece2d859
|
219
|
u8_t first_seg)
|
mbed714 |
0:d616ece2d859
|
220
|
{
|
mbed714 |
0:d616ece2d859
|
221
|
struct pbuf *p;
|
mbed714 |
0:d616ece2d859
|
222
|
u16_t alloc = length;
|
mbed714 |
0:d616ece2d859
|
223
|
|
mbed714 |
0:d616ece2d859
|
224
|
#if LWIP_NETIF_TX_SINGLE_PBUF
|
mbed714 |
0:d616ece2d859
|
225
|
LWIP_UNUSED_ARG(max_length);
|
mbed714 |
0:d616ece2d859
|
226
|
LWIP_UNUSED_ARG(pcb);
|
mbed714 |
0:d616ece2d859
|
227
|
LWIP_UNUSED_ARG(apiflags);
|
mbed714 |
0:d616ece2d859
|
228
|
LWIP_UNUSED_ARG(first_seg);
|
mbed714 |
0:d616ece2d859
|
229
|
/* always create MSS-sized pbufs */
|
mbed714 |
0:d616ece2d859
|
230
|
alloc = TCP_MSS;
|
mbed714 |
0:d616ece2d859
|
231
|
#else /* LWIP_NETIF_TX_SINGLE_PBUF */
|
mbed714 |
0:d616ece2d859
|
232
|
if (length < max_length) {
|
mbed714 |
0:d616ece2d859
|
233
|
/* Should we allocate an oversized pbuf, or just the minimum
|
mbed714 |
0:d616ece2d859
|
234
|
* length required? If tcp_write is going to be called again
|
mbed714 |
0:d616ece2d859
|
235
|
* before this segment is transmitted, we want the oversized
|
mbed714 |
0:d616ece2d859
|
236
|
* buffer. If the segment will be transmitted immediately, we can
|
mbed714 |
0:d616ece2d859
|
237
|
* save memory by allocating only length. We use a simple
|
mbed714 |
0:d616ece2d859
|
238
|
* heuristic based on the following information:
|
mbed714 |
0:d616ece2d859
|
239
|
*
|
mbed714 |
0:d616ece2d859
|
240
|
* Did the user set TCP_WRITE_FLAG_MORE?
|
mbed714 |
0:d616ece2d859
|
241
|
*
|
mbed714 |
0:d616ece2d859
|
242
|
* Will the Nagle algorithm defer transmission of this segment?
|
mbed714 |
0:d616ece2d859
|
243
|
*/
|
mbed714 |
0:d616ece2d859
|
244
|
if ((apiflags & TCP_WRITE_FLAG_MORE) ||
|
mbed714 |
0:d616ece2d859
|
245
|
(!(pcb->flags & TF_NODELAY) &&
|
mbed714 |
0:d616ece2d859
|
246
|
(!first_seg ||
|
mbed714 |
0:d616ece2d859
|
247
|
pcb->unsent != NULL ||
|
mbed714 |
0:d616ece2d859
|
248
|
pcb->unacked != NULL))) {
|
mbed714 |
0:d616ece2d859
|
249
|
alloc = LWIP_MIN(max_length, LWIP_MEM_ALIGN_SIZE(length + TCP_OVERSIZE));
|
mbed714 |
0:d616ece2d859
|
250
|
}
|
mbed714 |
0:d616ece2d859
|
251
|
}
|
mbed714 |
0:d616ece2d859
|
252
|
#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
|
mbed714 |
0:d616ece2d859
|
253
|
p = pbuf_alloc(layer, alloc, PBUF_RAM);
|
mbed714 |
0:d616ece2d859
|
254
|
if (p == NULL) {
|
mbed714 |
0:d616ece2d859
|
255
|
return NULL;
|
mbed714 |
0:d616ece2d859
|
256
|
}
|
mbed714 |
0:d616ece2d859
|
257
|
LWIP_ASSERT("need unchained pbuf", p->next == NULL);
|
mbed714 |
0:d616ece2d859
|
258
|
*oversize = p->len - length;
|
mbed714 |
0:d616ece2d859
|
259
|
/* trim p->len to the currently used size */
|
mbed714 |
0:d616ece2d859
|
260
|
p->len = p->tot_len = length;
|
mbed714 |
0:d616ece2d859
|
261
|
return p;
|
mbed714 |
0:d616ece2d859
|
262
|
}
|
mbed714 |
0:d616ece2d859
|
263
|
#else /* TCP_OVERSIZE */
|
mbed714 |
0:d616ece2d859
|
264
|
#define tcp_pbuf_prealloc(layer, length, mx, os, pcb, api, fst) pbuf_alloc((layer), (length), PBUF_RAM)
|
mbed714 |
0:d616ece2d859
|
265
|
#endif /* TCP_OVERSIZE */
|
mbed714 |
0:d616ece2d859
|
266
|
|
mbed714 |
0:d616ece2d859
|
267
|
#if TCP_CHECKSUM_ON_COPY
|
mbed714 |
0:d616ece2d859
|
268
|
/** Add a checksum of newly added data to the segment */
|
mbed714 |
0:d616ece2d859
|
269
|
static void
|
mbed714 |
0:d616ece2d859
|
270
|
tcp_seg_add_chksum(u16_t chksum, u16_t len, u16_t *seg_chksum,
|
mbed714 |
0:d616ece2d859
|
271
|
u8_t *seg_chksum_swapped)
|
mbed714 |
0:d616ece2d859
|
272
|
{
|
mbed714 |
0:d616ece2d859
|
273
|
u32_t helper;
|
mbed714 |
0:d616ece2d859
|
274
|
/* add chksum to old chksum and fold to u16_t */
|
mbed714 |
0:d616ece2d859
|
275
|
helper = chksum + *seg_chksum;
|
mbed714 |
0:d616ece2d859
|
276
|
chksum = FOLD_U32T(helper);
|
mbed714 |
0:d616ece2d859
|
277
|
if ((len & 1) != 0) {
|
mbed714 |
0:d616ece2d859
|
278
|
*seg_chksum_swapped = 1 - *seg_chksum_swapped;
|
mbed714 |
0:d616ece2d859
|
279
|
chksum = SWAP_BYTES_IN_WORD(chksum);
|
mbed714 |
0:d616ece2d859
|
280
|
}
|
mbed714 |
0:d616ece2d859
|
281
|
*seg_chksum = chksum;
|
mbed714 |
0:d616ece2d859
|
282
|
}
|
mbed714 |
0:d616ece2d859
|
283
|
#endif /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
284
|
|
mbed714 |
0:d616ece2d859
|
285
|
/** Checks if tcp_write is allowed or not (checks state, snd_buf and snd_queuelen).
|
mbed714 |
0:d616ece2d859
|
286
|
*
|
mbed714 |
0:d616ece2d859
|
287
|
* @param pcb the tcp pcb to check for
|
mbed714 |
0:d616ece2d859
|
288
|
* @param len length of data to send (checked agains snd_buf)
|
mbed714 |
0:d616ece2d859
|
289
|
* @return ERR_OK if tcp_write is allowed to proceed, another err_t otherwise
|
mbed714 |
0:d616ece2d859
|
290
|
*/
|
mbed714 |
0:d616ece2d859
|
291
|
static err_t
|
mbed714 |
0:d616ece2d859
|
292
|
tcp_write_checks(struct tcp_pcb *pcb, u16_t len)
|
mbed714 |
0:d616ece2d859
|
293
|
{
|
mbed714 |
0:d616ece2d859
|
294
|
/* connection is in invalid state for data transmission? */
|
mbed714 |
0:d616ece2d859
|
295
|
if ((pcb->state != ESTABLISHED) &&
|
mbed714 |
0:d616ece2d859
|
296
|
(pcb->state != CLOSE_WAIT) &&
|
mbed714 |
0:d616ece2d859
|
297
|
(pcb->state != SYN_SENT) &&
|
mbed714 |
0:d616ece2d859
|
298
|
(pcb->state != SYN_RCVD)) {
|
mbed714 |
0:d616ece2d859
|
299
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | LWIP_DBG_STATE | LWIP_DBG_LEVEL_SEVERE, ("tcp_write() called in invalid state\n"));
|
mbed714 |
0:d616ece2d859
|
300
|
return ERR_CONN;
|
mbed714 |
0:d616ece2d859
|
301
|
} else if (len == 0) {
|
mbed714 |
0:d616ece2d859
|
302
|
return ERR_OK;
|
mbed714 |
0:d616ece2d859
|
303
|
}
|
mbed714 |
0:d616ece2d859
|
304
|
|
mbed714 |
0:d616ece2d859
|
305
|
/* fail on too much data */
|
mbed714 |
0:d616ece2d859
|
306
|
if (len > pcb->snd_buf) {
|
mbed714 |
0:d616ece2d859
|
307
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 3, ("tcp_write: too much data (len=%"U16_F" > snd_buf=%"U16_F")\n",
|
mbed714 |
0:d616ece2d859
|
308
|
len, pcb->snd_buf));
|
mbed714 |
0:d616ece2d859
|
309
|
pcb->flags |= TF_NAGLEMEMERR;
|
mbed714 |
0:d616ece2d859
|
310
|
return ERR_MEM;
|
mbed714 |
0:d616ece2d859
|
311
|
}
|
mbed714 |
0:d616ece2d859
|
312
|
|
mbed714 |
0:d616ece2d859
|
313
|
LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_write: queuelen: %"U16_F"\n", (u16_t)pcb->snd_queuelen));
|
mbed714 |
0:d616ece2d859
|
314
|
|
mbed714 |
0:d616ece2d859
|
315
|
/* If total number of pbufs on the unsent/unacked queues exceeds the
|
mbed714 |
0:d616ece2d859
|
316
|
* configured maximum, return an error */
|
mbed714 |
0:d616ece2d859
|
317
|
/* check for configured max queuelen and possible overflow */
|
mbed714 |
0:d616ece2d859
|
318
|
if ((pcb->snd_queuelen >= TCP_SND_QUEUELEN) || (pcb->snd_queuelen > TCP_SNDQUEUELEN_OVERFLOW)) {
|
mbed714 |
0:d616ece2d859
|
319
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 3, ("tcp_write: too long queue %"U16_F" (max %"U16_F")\n",
|
mbed714 |
0:d616ece2d859
|
320
|
pcb->snd_queuelen, TCP_SND_QUEUELEN));
|
mbed714 |
0:d616ece2d859
|
321
|
TCP_STATS_INC(tcp.memerr);
|
mbed714 |
0:d616ece2d859
|
322
|
pcb->flags |= TF_NAGLEMEMERR;
|
mbed714 |
0:d616ece2d859
|
323
|
return ERR_MEM;
|
mbed714 |
0:d616ece2d859
|
324
|
}
|
mbed714 |
0:d616ece2d859
|
325
|
if (pcb->snd_queuelen != 0) {
|
mbed714 |
0:d616ece2d859
|
326
|
LWIP_ASSERT("tcp_write: pbufs on queue => at least one queue non-empty",
|
mbed714 |
0:d616ece2d859
|
327
|
pcb->unacked != NULL || pcb->unsent != NULL);
|
mbed714 |
0:d616ece2d859
|
328
|
} else {
|
mbed714 |
0:d616ece2d859
|
329
|
LWIP_ASSERT("tcp_write: no pbufs on queue => both queues empty",
|
mbed714 |
0:d616ece2d859
|
330
|
pcb->unacked == NULL && pcb->unsent == NULL);
|
mbed714 |
0:d616ece2d859
|
331
|
}
|
mbed714 |
0:d616ece2d859
|
332
|
return ERR_OK;
|
mbed714 |
0:d616ece2d859
|
333
|
}
|
mbed714 |
0:d616ece2d859
|
334
|
|
mbed714 |
0:d616ece2d859
|
335
|
/**
|
mbed714 |
0:d616ece2d859
|
336
|
* Write data for sending (but does not send it immediately).
|
mbed714 |
0:d616ece2d859
|
337
|
*
|
mbed714 |
0:d616ece2d859
|
338
|
* It waits in the expectation of more data being sent soon (as
|
mbed714 |
0:d616ece2d859
|
339
|
* it can send them more efficiently by combining them together).
|
mbed714 |
0:d616ece2d859
|
340
|
* To prompt the system to send data now, call tcp_output() after
|
mbed714 |
0:d616ece2d859
|
341
|
* calling tcp_write().
|
mbed714 |
0:d616ece2d859
|
342
|
*
|
mbed714 |
0:d616ece2d859
|
343
|
* @param pcb Protocol control block for the TCP connection to enqueue data for.
|
mbed714 |
0:d616ece2d859
|
344
|
* @param arg Pointer to the data to be enqueued for sending.
|
mbed714 |
0:d616ece2d859
|
345
|
* @param len Data length in bytes
|
mbed714 |
0:d616ece2d859
|
346
|
* @param apiflags combination of following flags :
|
mbed714 |
0:d616ece2d859
|
347
|
* - TCP_WRITE_FLAG_COPY (0x01) data will be copied into memory belonging to the stack
|
mbed714 |
0:d616ece2d859
|
348
|
* - TCP_WRITE_FLAG_MORE (0x02) for TCP connection, PSH flag will be set on last segment sent,
|
mbed714 |
0:d616ece2d859
|
349
|
* @return ERR_OK if enqueued, another err_t on error
|
mbed714 |
0:d616ece2d859
|
350
|
*/
|
mbed714 |
0:d616ece2d859
|
351
|
err_t
|
mbed714 |
0:d616ece2d859
|
352
|
tcp_write(struct tcp_pcb *pcb, const void *arg, u16_t len, u8_t apiflags)
|
mbed714 |
0:d616ece2d859
|
353
|
{
|
mbed714 |
0:d616ece2d859
|
354
|
struct pbuf *concat_p = NULL;
|
mbed714 |
0:d616ece2d859
|
355
|
struct tcp_seg *last_unsent = NULL, *seg = NULL, *prev_seg = NULL, *queue = NULL;
|
mbed714 |
0:d616ece2d859
|
356
|
u16_t pos = 0; /* position in 'arg' data */
|
mbed714 |
0:d616ece2d859
|
357
|
u16_t queuelen;
|
mbed714 |
0:d616ece2d859
|
358
|
u8_t optlen = 0;
|
mbed714 |
0:d616ece2d859
|
359
|
u8_t optflags = 0;
|
mbed714 |
0:d616ece2d859
|
360
|
#if TCP_OVERSIZE
|
mbed714 |
0:d616ece2d859
|
361
|
u16_t oversize = 0;
|
mbed714 |
0:d616ece2d859
|
362
|
u16_t oversize_used = 0;
|
mbed714 |
0:d616ece2d859
|
363
|
#endif /* TCP_OVERSIZE */
|
mbed714 |
0:d616ece2d859
|
364
|
#if TCP_CHECKSUM_ON_COPY
|
mbed714 |
0:d616ece2d859
|
365
|
u16_t concat_chksum = 0;
|
mbed714 |
0:d616ece2d859
|
366
|
u8_t concat_chksum_swapped = 0;
|
mbed714 |
0:d616ece2d859
|
367
|
u16_t concat_chksummed = 0;
|
mbed714 |
0:d616ece2d859
|
368
|
#endif /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
369
|
err_t err;
|
mbed714 |
0:d616ece2d859
|
370
|
|
mbed714 |
0:d616ece2d859
|
371
|
#if LWIP_NETIF_TX_SINGLE_PBUF
|
mbed714 |
0:d616ece2d859
|
372
|
/* Always copy to try to create single pbufs for TX */
|
mbed714 |
0:d616ece2d859
|
373
|
apiflags |= TCP_WRITE_FLAG_COPY;
|
mbed714 |
0:d616ece2d859
|
374
|
#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
|
mbed714 |
0:d616ece2d859
|
375
|
|
mbed714 |
0:d616ece2d859
|
376
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_write(pcb=%p, data=%p, len=%"U16_F", apiflags=%"U16_F")\n",
|
mbed714 |
0:d616ece2d859
|
377
|
(void *)pcb, arg, len, (u16_t)apiflags));
|
mbed714 |
0:d616ece2d859
|
378
|
LWIP_ERROR("tcp_write: arg == NULL (programmer violates API)",
|
mbed714 |
0:d616ece2d859
|
379
|
arg != NULL, return ERR_ARG;);
|
mbed714 |
0:d616ece2d859
|
380
|
|
mbed714 |
0:d616ece2d859
|
381
|
err = tcp_write_checks(pcb, len);
|
mbed714 |
0:d616ece2d859
|
382
|
if (err != ERR_OK) {
|
mbed714 |
0:d616ece2d859
|
383
|
return err;
|
mbed714 |
0:d616ece2d859
|
384
|
}
|
mbed714 |
0:d616ece2d859
|
385
|
queuelen = pcb->snd_queuelen;
|
mbed714 |
0:d616ece2d859
|
386
|
|
mbed714 |
0:d616ece2d859
|
387
|
#if LWIP_TCP_TIMESTAMPS
|
mbed714 |
0:d616ece2d859
|
388
|
if ((pcb->flags & TF_TIMESTAMP)) {
|
mbed714 |
0:d616ece2d859
|
389
|
optflags = TF_SEG_OPTS_TS;
|
mbed714 |
0:d616ece2d859
|
390
|
optlen = LWIP_TCP_OPT_LENGTH(TF_SEG_OPTS_TS);
|
mbed714 |
0:d616ece2d859
|
391
|
}
|
mbed714 |
0:d616ece2d859
|
392
|
#endif /* LWIP_TCP_TIMESTAMPS */
|
mbed714 |
0:d616ece2d859
|
393
|
|
mbed714 |
0:d616ece2d859
|
394
|
|
mbed714 |
0:d616ece2d859
|
395
|
/*
|
mbed714 |
0:d616ece2d859
|
396
|
* TCP segmentation is done in three phases with increasing complexity:
|
mbed714 |
0:d616ece2d859
|
397
|
*
|
mbed714 |
0:d616ece2d859
|
398
|
* 1. Copy data directly into an oversized pbuf.
|
mbed714 |
0:d616ece2d859
|
399
|
* 2. Chain a new pbuf to the end of pcb->unsent.
|
mbed714 |
0:d616ece2d859
|
400
|
* 3. Create new segments.
|
mbed714 |
0:d616ece2d859
|
401
|
*
|
mbed714 |
0:d616ece2d859
|
402
|
* We may run out of memory at any point. In that case we must
|
mbed714 |
0:d616ece2d859
|
403
|
* return ERR_MEM and not change anything in pcb. Therefore, all
|
mbed714 |
0:d616ece2d859
|
404
|
* changes are recorded in local variables and committed at the end
|
mbed714 |
0:d616ece2d859
|
405
|
* of the function. Some pcb fields are maintained in local copies:
|
mbed714 |
0:d616ece2d859
|
406
|
*
|
mbed714 |
0:d616ece2d859
|
407
|
* queuelen = pcb->snd_queuelen
|
mbed714 |
0:d616ece2d859
|
408
|
* oversize = pcb->unsent_oversize
|
mbed714 |
0:d616ece2d859
|
409
|
*
|
mbed714 |
0:d616ece2d859
|
410
|
* These variables are set consistently by the phases:
|
mbed714 |
0:d616ece2d859
|
411
|
*
|
mbed714 |
0:d616ece2d859
|
412
|
* seg points to the last segment tampered with.
|
mbed714 |
0:d616ece2d859
|
413
|
*
|
mbed714 |
0:d616ece2d859
|
414
|
* pos records progress as data is segmented.
|
mbed714 |
0:d616ece2d859
|
415
|
*/
|
mbed714 |
0:d616ece2d859
|
416
|
|
mbed714 |
0:d616ece2d859
|
417
|
/* Find the tail of the unsent queue. */
|
mbed714 |
0:d616ece2d859
|
418
|
if (pcb->unsent != NULL) {
|
mbed714 |
0:d616ece2d859
|
419
|
u16_t space;
|
mbed714 |
0:d616ece2d859
|
420
|
u16_t unsent_optlen;
|
mbed714 |
0:d616ece2d859
|
421
|
|
mbed714 |
0:d616ece2d859
|
422
|
/* @todo: this could be sped up by keeping last_unsent in the pcb */
|
mbed714 |
0:d616ece2d859
|
423
|
for (last_unsent = pcb->unsent; last_unsent->next != NULL;
|
mbed714 |
0:d616ece2d859
|
424
|
last_unsent = last_unsent->next);
|
mbed714 |
0:d616ece2d859
|
425
|
|
mbed714 |
0:d616ece2d859
|
426
|
/* Usable space at the end of the last unsent segment */
|
mbed714 |
0:d616ece2d859
|
427
|
unsent_optlen = LWIP_TCP_OPT_LENGTH(last_unsent->flags);
|
mbed714 |
0:d616ece2d859
|
428
|
space = pcb->mss - (last_unsent->len + unsent_optlen);
|
mbed714 |
0:d616ece2d859
|
429
|
|
mbed714 |
0:d616ece2d859
|
430
|
/*
|
mbed714 |
0:d616ece2d859
|
431
|
* Phase 1: Copy data directly into an oversized pbuf.
|
mbed714 |
0:d616ece2d859
|
432
|
*
|
mbed714 |
0:d616ece2d859
|
433
|
* The number of bytes copied is recorded in the oversize_used
|
mbed714 |
0:d616ece2d859
|
434
|
* variable. The actual copying is done at the bottom of the
|
mbed714 |
0:d616ece2d859
|
435
|
* function.
|
mbed714 |
0:d616ece2d859
|
436
|
*/
|
mbed714 |
0:d616ece2d859
|
437
|
#if TCP_OVERSIZE
|
mbed714 |
0:d616ece2d859
|
438
|
#if TCP_OVERSIZE_DBGCHECK
|
mbed714 |
0:d616ece2d859
|
439
|
/* check that pcb->unsent_oversize matches last_unsent->unsent_oversize */
|
mbed714 |
0:d616ece2d859
|
440
|
LWIP_ASSERT("unsent_oversize mismatch (pcb vs. last_unsent)",
|
mbed714 |
0:d616ece2d859
|
441
|
pcb->unsent_oversize == last_unsent->oversize_left);
|
mbed714 |
0:d616ece2d859
|
442
|
#endif /* TCP_OVERSIZE_DBGCHECK */
|
mbed714 |
0:d616ece2d859
|
443
|
oversize = pcb->unsent_oversize;
|
mbed714 |
0:d616ece2d859
|
444
|
if (oversize > 0) {
|
mbed714 |
0:d616ece2d859
|
445
|
LWIP_ASSERT("inconsistent oversize vs. space", oversize_used <= space);
|
mbed714 |
0:d616ece2d859
|
446
|
seg = last_unsent;
|
mbed714 |
0:d616ece2d859
|
447
|
oversize_used = oversize < len ? oversize : len;
|
mbed714 |
0:d616ece2d859
|
448
|
pos += oversize_used;
|
mbed714 |
0:d616ece2d859
|
449
|
oversize -= oversize_used;
|
mbed714 |
0:d616ece2d859
|
450
|
space -= oversize_used;
|
mbed714 |
0:d616ece2d859
|
451
|
}
|
mbed714 |
0:d616ece2d859
|
452
|
/* now we are either finished or oversize is zero */
|
mbed714 |
0:d616ece2d859
|
453
|
LWIP_ASSERT("inconsistend oversize vs. len", (oversize == 0) || (pos == len));
|
mbed714 |
0:d616ece2d859
|
454
|
#endif /* TCP_OVERSIZE */
|
mbed714 |
0:d616ece2d859
|
455
|
|
mbed714 |
0:d616ece2d859
|
456
|
/*
|
mbed714 |
0:d616ece2d859
|
457
|
* Phase 2: Chain a new pbuf to the end of pcb->unsent.
|
mbed714 |
0:d616ece2d859
|
458
|
*
|
mbed714 |
0:d616ece2d859
|
459
|
* We don't extend segments containing SYN/FIN flags or options
|
mbed714 |
0:d616ece2d859
|
460
|
* (len==0). The new pbuf is kept in concat_p and pbuf_cat'ed at
|
mbed714 |
0:d616ece2d859
|
461
|
* the end.
|
mbed714 |
0:d616ece2d859
|
462
|
*/
|
mbed714 |
0:d616ece2d859
|
463
|
if ((pos < len) && (space > 0) && (last_unsent->len > 0)) {
|
mbed714 |
0:d616ece2d859
|
464
|
u16_t seglen = space < len - pos ? space : len - pos;
|
mbed714 |
0:d616ece2d859
|
465
|
seg = last_unsent;
|
mbed714 |
0:d616ece2d859
|
466
|
|
mbed714 |
0:d616ece2d859
|
467
|
/* Create a pbuf with a copy or reference to seglen bytes. We
|
mbed714 |
0:d616ece2d859
|
468
|
* can use PBUF_RAW here since the data appears in the middle of
|
mbed714 |
0:d616ece2d859
|
469
|
* a segment. A header will never be prepended. */
|
mbed714 |
0:d616ece2d859
|
470
|
if (apiflags & TCP_WRITE_FLAG_COPY) {
|
mbed714 |
0:d616ece2d859
|
471
|
/* Data is copied */
|
mbed714 |
0:d616ece2d859
|
472
|
if ((concat_p = tcp_pbuf_prealloc(PBUF_RAW, seglen, space, &oversize, pcb, apiflags, 1)) == NULL) {
|
mbed714 |
0:d616ece2d859
|
473
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2,
|
mbed714 |
0:d616ece2d859
|
474
|
("tcp_write : could not allocate memory for pbuf copy size %"U16_F"\n",
|
mbed714 |
0:d616ece2d859
|
475
|
seglen));
|
mbed714 |
0:d616ece2d859
|
476
|
goto memerr;
|
mbed714 |
0:d616ece2d859
|
477
|
}
|
mbed714 |
0:d616ece2d859
|
478
|
#if TCP_OVERSIZE_DBGCHECK
|
mbed714 |
0:d616ece2d859
|
479
|
last_unsent->oversize_left = oversize;
|
mbed714 |
0:d616ece2d859
|
480
|
#endif /* TCP_OVERSIZE_DBGCHECK */
|
mbed714 |
0:d616ece2d859
|
481
|
TCP_DATA_COPY2(concat_p->payload, (u8_t*)arg + pos, seglen, &concat_chksum, &concat_chksum_swapped);
|
mbed714 |
0:d616ece2d859
|
482
|
#if TCP_CHECKSUM_ON_COPY
|
mbed714 |
0:d616ece2d859
|
483
|
concat_chksummed += seglen;
|
mbed714 |
0:d616ece2d859
|
484
|
#endif /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
485
|
} else {
|
mbed714 |
0:d616ece2d859
|
486
|
/* Data is not copied */
|
mbed714 |
0:d616ece2d859
|
487
|
if ((concat_p = pbuf_alloc(PBUF_RAW, seglen, PBUF_ROM)) == NULL) {
|
mbed714 |
0:d616ece2d859
|
488
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2,
|
mbed714 |
0:d616ece2d859
|
489
|
("tcp_write: could not allocate memory for zero-copy pbuf\n"));
|
mbed714 |
0:d616ece2d859
|
490
|
goto memerr;
|
mbed714 |
0:d616ece2d859
|
491
|
}
|
mbed714 |
0:d616ece2d859
|
492
|
#if TCP_CHECKSUM_ON_COPY
|
mbed714 |
0:d616ece2d859
|
493
|
/* calculate the checksum of nocopy-data */
|
mbed714 |
0:d616ece2d859
|
494
|
tcp_seg_add_chksum(~inet_chksum((u8_t*)arg + pos, seglen), seglen,
|
mbed714 |
0:d616ece2d859
|
495
|
&concat_chksum, &concat_chksum_swapped);
|
mbed714 |
0:d616ece2d859
|
496
|
concat_chksummed += seglen;
|
mbed714 |
0:d616ece2d859
|
497
|
#endif /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
498
|
/* reference the non-volatile payload data */
|
mbed714 |
0:d616ece2d859
|
499
|
concat_p->payload = (u8_t*)arg + pos;
|
mbed714 |
0:d616ece2d859
|
500
|
}
|
mbed714 |
0:d616ece2d859
|
501
|
|
mbed714 |
0:d616ece2d859
|
502
|
pos += seglen;
|
mbed714 |
0:d616ece2d859
|
503
|
queuelen += pbuf_clen(concat_p);
|
mbed714 |
0:d616ece2d859
|
504
|
}
|
mbed714 |
0:d616ece2d859
|
505
|
} else {
|
mbed714 |
0:d616ece2d859
|
506
|
#if TCP_OVERSIZE
|
mbed714 |
0:d616ece2d859
|
507
|
LWIP_ASSERT("unsent_oversize mismatch (pcb->unsent is NULL)",
|
mbed714 |
0:d616ece2d859
|
508
|
pcb->unsent_oversize == 0);
|
mbed714 |
0:d616ece2d859
|
509
|
#endif /* TCP_OVERSIZE */
|
mbed714 |
0:d616ece2d859
|
510
|
}
|
mbed714 |
0:d616ece2d859
|
511
|
|
mbed714 |
0:d616ece2d859
|
512
|
/*
|
mbed714 |
0:d616ece2d859
|
513
|
* Phase 3: Create new segments.
|
mbed714 |
0:d616ece2d859
|
514
|
*
|
mbed714 |
0:d616ece2d859
|
515
|
* The new segments are chained together in the local 'queue'
|
mbed714 |
0:d616ece2d859
|
516
|
* variable, ready to be appended to pcb->unsent.
|
mbed714 |
0:d616ece2d859
|
517
|
*/
|
mbed714 |
0:d616ece2d859
|
518
|
while (pos < len) {
|
mbed714 |
0:d616ece2d859
|
519
|
struct pbuf *p;
|
mbed714 |
0:d616ece2d859
|
520
|
u16_t left = len - pos;
|
mbed714 |
0:d616ece2d859
|
521
|
u16_t max_len = pcb->mss - optlen;
|
mbed714 |
0:d616ece2d859
|
522
|
u16_t seglen = left > max_len ? max_len : left;
|
mbed714 |
0:d616ece2d859
|
523
|
#if TCP_CHECKSUM_ON_COPY
|
mbed714 |
0:d616ece2d859
|
524
|
u16_t chksum = 0;
|
mbed714 |
0:d616ece2d859
|
525
|
u8_t chksum_swapped = 0;
|
mbed714 |
0:d616ece2d859
|
526
|
#endif /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
527
|
|
mbed714 |
0:d616ece2d859
|
528
|
if (apiflags & TCP_WRITE_FLAG_COPY) {
|
mbed714 |
0:d616ece2d859
|
529
|
/* If copy is set, memory should be allocated and data copied
|
mbed714 |
0:d616ece2d859
|
530
|
* into pbuf */
|
mbed714 |
0:d616ece2d859
|
531
|
if ((p = tcp_pbuf_prealloc(PBUF_TRANSPORT, seglen + optlen, pcb->mss, &oversize, pcb, apiflags, queue == NULL)) == NULL) {
|
mbed714 |
0:d616ece2d859
|
532
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_write : could not allocate memory for pbuf copy size %"U16_F"\n", seglen));
|
mbed714 |
0:d616ece2d859
|
533
|
goto memerr;
|
mbed714 |
0:d616ece2d859
|
534
|
}
|
mbed714 |
0:d616ece2d859
|
535
|
LWIP_ASSERT("tcp_write: check that first pbuf can hold the complete seglen",
|
mbed714 |
0:d616ece2d859
|
536
|
(p->len >= seglen));
|
mbed714 |
0:d616ece2d859
|
537
|
TCP_DATA_COPY2((char *)p->payload + optlen, (u8_t*)arg + pos, seglen, &chksum, &chksum_swapped);
|
mbed714 |
0:d616ece2d859
|
538
|
} else {
|
mbed714 |
0:d616ece2d859
|
539
|
/* Copy is not set: First allocate a pbuf for holding the data.
|
mbed714 |
0:d616ece2d859
|
540
|
* Since the referenced data is available at least until it is
|
mbed714 |
0:d616ece2d859
|
541
|
* sent out on the link (as it has to be ACKed by the remote
|
mbed714 |
0:d616ece2d859
|
542
|
* party) we can safely use PBUF_ROM instead of PBUF_REF here.
|
mbed714 |
0:d616ece2d859
|
543
|
*/
|
mbed714 |
0:d616ece2d859
|
544
|
struct pbuf *p2;
|
mbed714 |
0:d616ece2d859
|
545
|
#if TCP_OVERSIZE
|
mbed714 |
0:d616ece2d859
|
546
|
LWIP_ASSERT("oversize == 0", oversize == 0);
|
mbed714 |
0:d616ece2d859
|
547
|
#endif /* TCP_OVERSIZE */
|
mbed714 |
0:d616ece2d859
|
548
|
if ((p2 = pbuf_alloc(PBUF_TRANSPORT, seglen, PBUF_ROM)) == NULL) {
|
mbed714 |
0:d616ece2d859
|
549
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_write: could not allocate memory for zero-copy pbuf\n"));
|
mbed714 |
0:d616ece2d859
|
550
|
goto memerr;
|
mbed714 |
0:d616ece2d859
|
551
|
}
|
mbed714 |
0:d616ece2d859
|
552
|
#if TCP_CHECKSUM_ON_COPY
|
mbed714 |
0:d616ece2d859
|
553
|
/* calculate the checksum of nocopy-data */
|
mbed714 |
0:d616ece2d859
|
554
|
chksum = ~inet_chksum((u8_t*)arg + pos, seglen);
|
mbed714 |
0:d616ece2d859
|
555
|
#endif /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
556
|
/* reference the non-volatile payload data */
|
mbed714 |
0:d616ece2d859
|
557
|
p2->payload = (u8_t*)arg + pos;
|
mbed714 |
0:d616ece2d859
|
558
|
|
mbed714 |
0:d616ece2d859
|
559
|
/* Second, allocate a pbuf for the headers. */
|
mbed714 |
0:d616ece2d859
|
560
|
if ((p = pbuf_alloc(PBUF_TRANSPORT, optlen, PBUF_RAM)) == NULL) {
|
mbed714 |
0:d616ece2d859
|
561
|
/* If allocation fails, we have to deallocate the data pbuf as
|
mbed714 |
0:d616ece2d859
|
562
|
* well. */
|
mbed714 |
0:d616ece2d859
|
563
|
pbuf_free(p2);
|
mbed714 |
0:d616ece2d859
|
564
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_write: could not allocate memory for header pbuf\n"));
|
mbed714 |
0:d616ece2d859
|
565
|
goto memerr;
|
mbed714 |
0:d616ece2d859
|
566
|
}
|
mbed714 |
0:d616ece2d859
|
567
|
/* Concatenate the headers and data pbufs together. */
|
mbed714 |
0:d616ece2d859
|
568
|
pbuf_cat(p/*header*/, p2/*data*/);
|
mbed714 |
0:d616ece2d859
|
569
|
}
|
mbed714 |
0:d616ece2d859
|
570
|
|
mbed714 |
0:d616ece2d859
|
571
|
queuelen += pbuf_clen(p);
|
mbed714 |
0:d616ece2d859
|
572
|
|
mbed714 |
0:d616ece2d859
|
573
|
/* Now that there are more segments queued, we check again if the
|
mbed714 |
0:d616ece2d859
|
574
|
* length of the queue exceeds the configured maximum or
|
mbed714 |
0:d616ece2d859
|
575
|
* overflows. */
|
mbed714 |
0:d616ece2d859
|
576
|
if ((queuelen > TCP_SND_QUEUELEN) || (queuelen > TCP_SNDQUEUELEN_OVERFLOW)) {
|
mbed714 |
0:d616ece2d859
|
577
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_write: queue too long %"U16_F" (%"U16_F")\n", queuelen, TCP_SND_QUEUELEN));
|
mbed714 |
0:d616ece2d859
|
578
|
pbuf_free(p);
|
mbed714 |
0:d616ece2d859
|
579
|
goto memerr;
|
mbed714 |
0:d616ece2d859
|
580
|
}
|
mbed714 |
0:d616ece2d859
|
581
|
|
mbed714 |
0:d616ece2d859
|
582
|
if ((seg = tcp_create_segment(pcb, p, 0, pcb->snd_lbb + pos, optflags)) == NULL) {
|
mbed714 |
0:d616ece2d859
|
583
|
goto memerr;
|
mbed714 |
0:d616ece2d859
|
584
|
}
|
mbed714 |
0:d616ece2d859
|
585
|
#if TCP_OVERSIZE_DBGCHECK
|
mbed714 |
0:d616ece2d859
|
586
|
seg->oversize_left = oversize;
|
mbed714 |
0:d616ece2d859
|
587
|
#endif /* TCP_OVERSIZE_DBGCHECK */
|
mbed714 |
0:d616ece2d859
|
588
|
#if TCP_CHECKSUM_ON_COPY
|
mbed714 |
0:d616ece2d859
|
589
|
seg->chksum = chksum;
|
mbed714 |
0:d616ece2d859
|
590
|
seg->chksum_swapped = chksum_swapped;
|
mbed714 |
0:d616ece2d859
|
591
|
seg->flags |= TF_SEG_DATA_CHECKSUMMED;
|
mbed714 |
0:d616ece2d859
|
592
|
#endif /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
593
|
/* Fix dataptr for the nocopy case */
|
mbed714 |
0:d616ece2d859
|
594
|
if ((apiflags & TCP_WRITE_FLAG_COPY) == 0) {
|
mbed714 |
0:d616ece2d859
|
595
|
seg->dataptr = (u8_t*)arg + pos;
|
mbed714 |
0:d616ece2d859
|
596
|
}
|
mbed714 |
0:d616ece2d859
|
597
|
|
mbed714 |
0:d616ece2d859
|
598
|
/* first segment of to-be-queued data? */
|
mbed714 |
0:d616ece2d859
|
599
|
if (queue == NULL) {
|
mbed714 |
0:d616ece2d859
|
600
|
queue = seg;
|
mbed714 |
0:d616ece2d859
|
601
|
} else {
|
mbed714 |
0:d616ece2d859
|
602
|
/* Attach the segment to the end of the queued segments */
|
mbed714 |
0:d616ece2d859
|
603
|
LWIP_ASSERT("prev_seg != NULL", prev_seg != NULL);
|
mbed714 |
0:d616ece2d859
|
604
|
prev_seg->next = seg;
|
mbed714 |
0:d616ece2d859
|
605
|
}
|
mbed714 |
0:d616ece2d859
|
606
|
/* remember last segment of to-be-queued data for next iteration */
|
mbed714 |
0:d616ece2d859
|
607
|
prev_seg = seg;
|
mbed714 |
0:d616ece2d859
|
608
|
|
mbed714 |
0:d616ece2d859
|
609
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | LWIP_DBG_TRACE, ("tcp_write: queueing %"U32_F":%"U32_F"\n",
|
mbed714 |
0:d616ece2d859
|
610
|
ntohl(seg->tcphdr->seqno),
|
mbed714 |
0:d616ece2d859
|
611
|
ntohl(seg->tcphdr->seqno) + TCP_TCPLEN(seg)));
|
mbed714 |
0:d616ece2d859
|
612
|
|
mbed714 |
0:d616ece2d859
|
613
|
pos += seglen;
|
mbed714 |
0:d616ece2d859
|
614
|
}
|
mbed714 |
0:d616ece2d859
|
615
|
|
mbed714 |
0:d616ece2d859
|
616
|
/*
|
mbed714 |
0:d616ece2d859
|
617
|
* All three segmentation phases were successful. We can commit the
|
mbed714 |
0:d616ece2d859
|
618
|
* transaction.
|
mbed714 |
0:d616ece2d859
|
619
|
*/
|
mbed714 |
0:d616ece2d859
|
620
|
|
mbed714 |
0:d616ece2d859
|
621
|
/*
|
mbed714 |
0:d616ece2d859
|
622
|
* Phase 1: If data has been added to the preallocated tail of
|
mbed714 |
0:d616ece2d859
|
623
|
* last_unsent, we update the length fields of the pbuf chain.
|
mbed714 |
0:d616ece2d859
|
624
|
*/
|
mbed714 |
0:d616ece2d859
|
625
|
#if TCP_OVERSIZE
|
mbed714 |
0:d616ece2d859
|
626
|
if (oversize_used > 0) {
|
mbed714 |
0:d616ece2d859
|
627
|
struct pbuf *p;
|
mbed714 |
0:d616ece2d859
|
628
|
/* Bump tot_len of whole chain, len of tail */
|
mbed714 |
0:d616ece2d859
|
629
|
for (p = last_unsent->p; p; p = p->next) {
|
mbed714 |
0:d616ece2d859
|
630
|
p->tot_len += oversize_used;
|
mbed714 |
0:d616ece2d859
|
631
|
if (p->next == NULL) {
|
mbed714 |
0:d616ece2d859
|
632
|
TCP_DATA_COPY((char *)p->payload + p->len, arg, oversize_used, last_unsent);
|
mbed714 |
0:d616ece2d859
|
633
|
p->len += oversize_used;
|
mbed714 |
0:d616ece2d859
|
634
|
}
|
mbed714 |
0:d616ece2d859
|
635
|
}
|
mbed714 |
0:d616ece2d859
|
636
|
last_unsent->len += oversize_used;
|
mbed714 |
0:d616ece2d859
|
637
|
#if TCP_OVERSIZE_DBGCHECK
|
mbed714 |
0:d616ece2d859
|
638
|
last_unsent->oversize_left -= oversize_used;
|
mbed714 |
0:d616ece2d859
|
639
|
#endif /* TCP_OVERSIZE_DBGCHECK */
|
mbed714 |
0:d616ece2d859
|
640
|
}
|
mbed714 |
0:d616ece2d859
|
641
|
pcb->unsent_oversize = oversize;
|
mbed714 |
0:d616ece2d859
|
642
|
#endif /* TCP_OVERSIZE */
|
mbed714 |
0:d616ece2d859
|
643
|
|
mbed714 |
0:d616ece2d859
|
644
|
/*
|
mbed714 |
0:d616ece2d859
|
645
|
* Phase 2: concat_p can be concatenated onto last_unsent->p
|
mbed714 |
0:d616ece2d859
|
646
|
*/
|
mbed714 |
0:d616ece2d859
|
647
|
if (concat_p != NULL) {
|
mbed714 |
0:d616ece2d859
|
648
|
LWIP_ASSERT("tcp_write: cannot concatenate when pcb->unsent is empty",
|
mbed714 |
0:d616ece2d859
|
649
|
(last_unsent != NULL));
|
mbed714 |
0:d616ece2d859
|
650
|
pbuf_cat(last_unsent->p, concat_p);
|
mbed714 |
0:d616ece2d859
|
651
|
last_unsent->len += concat_p->tot_len;
|
mbed714 |
0:d616ece2d859
|
652
|
#if TCP_CHECKSUM_ON_COPY
|
mbed714 |
0:d616ece2d859
|
653
|
if (concat_chksummed) {
|
mbed714 |
0:d616ece2d859
|
654
|
tcp_seg_add_chksum(concat_chksum, concat_chksummed, &last_unsent->chksum,
|
mbed714 |
0:d616ece2d859
|
655
|
&last_unsent->chksum_swapped);
|
mbed714 |
0:d616ece2d859
|
656
|
last_unsent->flags |= TF_SEG_DATA_CHECKSUMMED;
|
mbed714 |
0:d616ece2d859
|
657
|
}
|
mbed714 |
0:d616ece2d859
|
658
|
#endif /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
659
|
}
|
mbed714 |
0:d616ece2d859
|
660
|
|
mbed714 |
0:d616ece2d859
|
661
|
/*
|
mbed714 |
0:d616ece2d859
|
662
|
* Phase 3: Append queue to pcb->unsent. Queue may be NULL, but that
|
mbed714 |
0:d616ece2d859
|
663
|
* is harmless
|
mbed714 |
0:d616ece2d859
|
664
|
*/
|
mbed714 |
0:d616ece2d859
|
665
|
if (last_unsent == NULL) {
|
mbed714 |
0:d616ece2d859
|
666
|
pcb->unsent = queue;
|
mbed714 |
0:d616ece2d859
|
667
|
} else {
|
mbed714 |
0:d616ece2d859
|
668
|
last_unsent->next = queue;
|
mbed714 |
0:d616ece2d859
|
669
|
}
|
mbed714 |
0:d616ece2d859
|
670
|
|
mbed714 |
0:d616ece2d859
|
671
|
/*
|
mbed714 |
0:d616ece2d859
|
672
|
* Finally update the pcb state.
|
mbed714 |
0:d616ece2d859
|
673
|
*/
|
mbed714 |
0:d616ece2d859
|
674
|
pcb->snd_lbb += len;
|
mbed714 |
0:d616ece2d859
|
675
|
pcb->snd_buf -= len;
|
mbed714 |
0:d616ece2d859
|
676
|
pcb->snd_queuelen = queuelen;
|
mbed714 |
0:d616ece2d859
|
677
|
|
mbed714 |
0:d616ece2d859
|
678
|
LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_write: %"S16_F" (after enqueued)\n",
|
mbed714 |
0:d616ece2d859
|
679
|
pcb->snd_queuelen));
|
mbed714 |
0:d616ece2d859
|
680
|
if (pcb->snd_queuelen != 0) {
|
mbed714 |
0:d616ece2d859
|
681
|
LWIP_ASSERT("tcp_write: valid queue length",
|
mbed714 |
0:d616ece2d859
|
682
|
pcb->unacked != NULL || pcb->unsent != NULL);
|
mbed714 |
0:d616ece2d859
|
683
|
}
|
mbed714 |
0:d616ece2d859
|
684
|
|
mbed714 |
0:d616ece2d859
|
685
|
/* Set the PSH flag in the last segment that we enqueued. */
|
mbed714 |
0:d616ece2d859
|
686
|
if (seg != NULL && seg->tcphdr != NULL && ((apiflags & TCP_WRITE_FLAG_MORE)==0)) {
|
mbed714 |
0:d616ece2d859
|
687
|
TCPH_SET_FLAG(seg->tcphdr, TCP_PSH);
|
mbed714 |
0:d616ece2d859
|
688
|
}
|
mbed714 |
0:d616ece2d859
|
689
|
|
mbed714 |
0:d616ece2d859
|
690
|
return ERR_OK;
|
mbed714 |
0:d616ece2d859
|
691
|
memerr:
|
mbed714 |
0:d616ece2d859
|
692
|
pcb->flags |= TF_NAGLEMEMERR;
|
mbed714 |
0:d616ece2d859
|
693
|
TCP_STATS_INC(tcp.memerr);
|
mbed714 |
0:d616ece2d859
|
694
|
|
mbed714 |
0:d616ece2d859
|
695
|
if (concat_p != NULL) {
|
mbed714 |
0:d616ece2d859
|
696
|
pbuf_free(concat_p);
|
mbed714 |
0:d616ece2d859
|
697
|
}
|
mbed714 |
0:d616ece2d859
|
698
|
if (queue != NULL) {
|
mbed714 |
0:d616ece2d859
|
699
|
tcp_segs_free(queue);
|
mbed714 |
0:d616ece2d859
|
700
|
}
|
mbed714 |
0:d616ece2d859
|
701
|
if (pcb->snd_queuelen != 0) {
|
mbed714 |
0:d616ece2d859
|
702
|
LWIP_ASSERT("tcp_write: valid queue length", pcb->unacked != NULL ||
|
mbed714 |
0:d616ece2d859
|
703
|
pcb->unsent != NULL);
|
mbed714 |
0:d616ece2d859
|
704
|
}
|
mbed714 |
0:d616ece2d859
|
705
|
LWIP_DEBUGF(TCP_QLEN_DEBUG | LWIP_DBG_STATE, ("tcp_write: %"S16_F" (with mem err)\n", pcb->snd_queuelen));
|
mbed714 |
0:d616ece2d859
|
706
|
return ERR_MEM;
|
mbed714 |
0:d616ece2d859
|
707
|
}
|
mbed714 |
0:d616ece2d859
|
708
|
|
mbed714 |
0:d616ece2d859
|
709
|
/**
|
mbed714 |
0:d616ece2d859
|
710
|
* Enqueue TCP options for transmission.
|
mbed714 |
0:d616ece2d859
|
711
|
*
|
mbed714 |
0:d616ece2d859
|
712
|
* Called by tcp_connect(), tcp_listen_input(), and tcp_send_ctrl().
|
mbed714 |
0:d616ece2d859
|
713
|
*
|
mbed714 |
0:d616ece2d859
|
714
|
* @param pcb Protocol control block for the TCP connection.
|
mbed714 |
0:d616ece2d859
|
715
|
* @param flags TCP header flags to set in the outgoing segment.
|
mbed714 |
0:d616ece2d859
|
716
|
* @param optdata pointer to TCP options, or NULL.
|
mbed714 |
0:d616ece2d859
|
717
|
* @param optlen length of TCP options in bytes.
|
mbed714 |
0:d616ece2d859
|
718
|
*/
|
mbed714 |
0:d616ece2d859
|
719
|
err_t
|
mbed714 |
0:d616ece2d859
|
720
|
tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags)
|
mbed714 |
0:d616ece2d859
|
721
|
{
|
mbed714 |
0:d616ece2d859
|
722
|
struct pbuf *p;
|
mbed714 |
0:d616ece2d859
|
723
|
struct tcp_seg *seg;
|
mbed714 |
0:d616ece2d859
|
724
|
u8_t optflags = 0;
|
mbed714 |
0:d616ece2d859
|
725
|
u8_t optlen = 0;
|
mbed714 |
0:d616ece2d859
|
726
|
|
mbed714 |
0:d616ece2d859
|
727
|
LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_enqueue_flags: queuelen: %"U16_F"\n", (u16_t)pcb->snd_queuelen));
|
mbed714 |
0:d616ece2d859
|
728
|
|
mbed714 |
0:d616ece2d859
|
729
|
LWIP_ASSERT("tcp_enqueue_flags: need either TCP_SYN or TCP_FIN in flags (programmer violates API)",
|
mbed714 |
0:d616ece2d859
|
730
|
(flags & (TCP_SYN | TCP_FIN)) != 0);
|
mbed714 |
0:d616ece2d859
|
731
|
|
mbed714 |
0:d616ece2d859
|
732
|
/* check for configured max queuelen and possible overflow */
|
mbed714 |
0:d616ece2d859
|
733
|
if ((pcb->snd_queuelen >= TCP_SND_QUEUELEN) || (pcb->snd_queuelen > TCP_SNDQUEUELEN_OVERFLOW)) {
|
mbed714 |
0:d616ece2d859
|
734
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 3, ("tcp_enqueue_flags: too long queue %"U16_F" (max %"U16_F")\n",
|
mbed714 |
0:d616ece2d859
|
735
|
pcb->snd_queuelen, TCP_SND_QUEUELEN));
|
mbed714 |
0:d616ece2d859
|
736
|
TCP_STATS_INC(tcp.memerr);
|
mbed714 |
0:d616ece2d859
|
737
|
pcb->flags |= TF_NAGLEMEMERR;
|
mbed714 |
0:d616ece2d859
|
738
|
return ERR_MEM;
|
mbed714 |
0:d616ece2d859
|
739
|
}
|
mbed714 |
0:d616ece2d859
|
740
|
|
mbed714 |
0:d616ece2d859
|
741
|
if (flags & TCP_SYN) {
|
mbed714 |
0:d616ece2d859
|
742
|
optflags = TF_SEG_OPTS_MSS;
|
mbed714 |
0:d616ece2d859
|
743
|
}
|
mbed714 |
0:d616ece2d859
|
744
|
#if LWIP_TCP_TIMESTAMPS
|
mbed714 |
0:d616ece2d859
|
745
|
if ((pcb->flags & TF_TIMESTAMP)) {
|
mbed714 |
0:d616ece2d859
|
746
|
optflags |= TF_SEG_OPTS_TS;
|
mbed714 |
0:d616ece2d859
|
747
|
}
|
mbed714 |
0:d616ece2d859
|
748
|
#endif /* LWIP_TCP_TIMESTAMPS */
|
mbed714 |
0:d616ece2d859
|
749
|
optlen = LWIP_TCP_OPT_LENGTH(optflags);
|
mbed714 |
0:d616ece2d859
|
750
|
|
mbed714 |
0:d616ece2d859
|
751
|
/* tcp_enqueue_flags is always called with either SYN or FIN in flags.
|
mbed714 |
0:d616ece2d859
|
752
|
* We need one available snd_buf byte to do that.
|
mbed714 |
0:d616ece2d859
|
753
|
* This means we can't send FIN while snd_buf==0. A better fix would be to
|
mbed714 |
0:d616ece2d859
|
754
|
* not include SYN and FIN sequence numbers in the snd_buf count. */
|
mbed714 |
0:d616ece2d859
|
755
|
if (pcb->snd_buf == 0) {
|
mbed714 |
0:d616ece2d859
|
756
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 3, ("tcp_enqueue_flags: no send buffer available\n"));
|
mbed714 |
0:d616ece2d859
|
757
|
TCP_STATS_INC(tcp.memerr);
|
mbed714 |
0:d616ece2d859
|
758
|
return ERR_MEM;
|
mbed714 |
0:d616ece2d859
|
759
|
}
|
mbed714 |
0:d616ece2d859
|
760
|
|
mbed714 |
0:d616ece2d859
|
761
|
/* Allocate pbuf with room for TCP header + options */
|
mbed714 |
0:d616ece2d859
|
762
|
if ((p = pbuf_alloc(PBUF_TRANSPORT, optlen, PBUF_RAM)) == NULL) {
|
mbed714 |
0:d616ece2d859
|
763
|
pcb->flags |= TF_NAGLEMEMERR;
|
mbed714 |
0:d616ece2d859
|
764
|
TCP_STATS_INC(tcp.memerr);
|
mbed714 |
0:d616ece2d859
|
765
|
return ERR_MEM;
|
mbed714 |
0:d616ece2d859
|
766
|
}
|
mbed714 |
0:d616ece2d859
|
767
|
LWIP_ASSERT("tcp_enqueue_flags: check that first pbuf can hold optlen",
|
mbed714 |
0:d616ece2d859
|
768
|
(p->len >= optlen));
|
mbed714 |
0:d616ece2d859
|
769
|
|
mbed714 |
0:d616ece2d859
|
770
|
/* Allocate memory for tcp_seg, and fill in fields. */
|
mbed714 |
0:d616ece2d859
|
771
|
if ((seg = tcp_create_segment(pcb, p, flags, pcb->snd_lbb, optflags)) == NULL) {
|
mbed714 |
0:d616ece2d859
|
772
|
pcb->flags |= TF_NAGLEMEMERR;
|
mbed714 |
0:d616ece2d859
|
773
|
TCP_STATS_INC(tcp.memerr);
|
mbed714 |
0:d616ece2d859
|
774
|
return ERR_MEM;
|
mbed714 |
0:d616ece2d859
|
775
|
}
|
mbed714 |
0:d616ece2d859
|
776
|
LWIP_ASSERT("tcp_enqueue_flags: invalid segment length", seg->len == 0);
|
mbed714 |
0:d616ece2d859
|
777
|
|
mbed714 |
0:d616ece2d859
|
778
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG | LWIP_DBG_TRACE,
|
mbed714 |
0:d616ece2d859
|
779
|
("tcp_enqueue_flags: queueing %"U32_F":%"U32_F" (0x%"X16_F")\n",
|
mbed714 |
0:d616ece2d859
|
780
|
ntohl(seg->tcphdr->seqno),
|
mbed714 |
0:d616ece2d859
|
781
|
ntohl(seg->tcphdr->seqno) + TCP_TCPLEN(seg),
|
mbed714 |
0:d616ece2d859
|
782
|
(u16_t)flags));
|
mbed714 |
0:d616ece2d859
|
783
|
|
mbed714 |
0:d616ece2d859
|
784
|
/* Now append seg to pcb->unsent queue */
|
mbed714 |
0:d616ece2d859
|
785
|
if (pcb->unsent == NULL) {
|
mbed714 |
0:d616ece2d859
|
786
|
pcb->unsent = seg;
|
mbed714 |
0:d616ece2d859
|
787
|
} else {
|
mbed714 |
0:d616ece2d859
|
788
|
struct tcp_seg *useg;
|
mbed714 |
0:d616ece2d859
|
789
|
for (useg = pcb->unsent; useg->next != NULL; useg = useg->next);
|
mbed714 |
0:d616ece2d859
|
790
|
useg->next = seg;
|
mbed714 |
0:d616ece2d859
|
791
|
}
|
mbed714 |
0:d616ece2d859
|
792
|
#if TCP_OVERSIZE
|
mbed714 |
0:d616ece2d859
|
793
|
/* The new unsent tail has no space */
|
mbed714 |
0:d616ece2d859
|
794
|
pcb->unsent_oversize = 0;
|
mbed714 |
0:d616ece2d859
|
795
|
#endif /* TCP_OVERSIZE */
|
mbed714 |
0:d616ece2d859
|
796
|
|
mbed714 |
0:d616ece2d859
|
797
|
/* SYN and FIN bump the sequence number */
|
mbed714 |
0:d616ece2d859
|
798
|
if ((flags & TCP_SYN) || (flags & TCP_FIN)) {
|
mbed714 |
0:d616ece2d859
|
799
|
pcb->snd_lbb++;
|
mbed714 |
0:d616ece2d859
|
800
|
/* optlen does not influence snd_buf */
|
mbed714 |
0:d616ece2d859
|
801
|
pcb->snd_buf--;
|
mbed714 |
0:d616ece2d859
|
802
|
}
|
mbed714 |
0:d616ece2d859
|
803
|
if (flags & TCP_FIN) {
|
mbed714 |
0:d616ece2d859
|
804
|
pcb->flags |= TF_FIN;
|
mbed714 |
0:d616ece2d859
|
805
|
}
|
mbed714 |
0:d616ece2d859
|
806
|
|
mbed714 |
0:d616ece2d859
|
807
|
/* update number of segments on the queues */
|
mbed714 |
0:d616ece2d859
|
808
|
pcb->snd_queuelen += pbuf_clen(seg->p);
|
mbed714 |
0:d616ece2d859
|
809
|
LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_enqueue_flags: %"S16_F" (after enqueued)\n", pcb->snd_queuelen));
|
mbed714 |
0:d616ece2d859
|
810
|
if (pcb->snd_queuelen != 0) {
|
mbed714 |
0:d616ece2d859
|
811
|
LWIP_ASSERT("tcp_enqueue_flags: invalid queue length",
|
mbed714 |
0:d616ece2d859
|
812
|
pcb->unacked != NULL || pcb->unsent != NULL);
|
mbed714 |
0:d616ece2d859
|
813
|
}
|
mbed714 |
0:d616ece2d859
|
814
|
|
mbed714 |
0:d616ece2d859
|
815
|
return ERR_OK;
|
mbed714 |
0:d616ece2d859
|
816
|
}
|
mbed714 |
0:d616ece2d859
|
817
|
|
mbed714 |
0:d616ece2d859
|
818
|
|
mbed714 |
0:d616ece2d859
|
819
|
#if LWIP_TCP_TIMESTAMPS
|
mbed714 |
0:d616ece2d859
|
820
|
/* Build a timestamp option (12 bytes long) at the specified options pointer)
|
mbed714 |
0:d616ece2d859
|
821
|
*
|
mbed714 |
0:d616ece2d859
|
822
|
* @param pcb tcp_pcb
|
mbed714 |
0:d616ece2d859
|
823
|
* @param opts option pointer where to store the timestamp option
|
mbed714 |
0:d616ece2d859
|
824
|
*/
|
mbed714 |
0:d616ece2d859
|
825
|
static void
|
mbed714 |
0:d616ece2d859
|
826
|
tcp_build_timestamp_option(struct tcp_pcb *pcb, u32_t *opts)
|
mbed714 |
0:d616ece2d859
|
827
|
{
|
mbed714 |
0:d616ece2d859
|
828
|
/* Pad with two NOP options to make everything nicely aligned */
|
mbed714 |
0:d616ece2d859
|
829
|
opts[0] = PP_HTONL(0x0101080A);
|
mbed714 |
0:d616ece2d859
|
830
|
opts[1] = htonl(sys_now());
|
mbed714 |
0:d616ece2d859
|
831
|
opts[2] = htonl(pcb->ts_recent);
|
mbed714 |
0:d616ece2d859
|
832
|
}
|
mbed714 |
0:d616ece2d859
|
833
|
#endif
|
mbed714 |
0:d616ece2d859
|
834
|
|
mbed714 |
0:d616ece2d859
|
835
|
/** Send an ACK without data.
|
mbed714 |
0:d616ece2d859
|
836
|
*
|
mbed714 |
0:d616ece2d859
|
837
|
* @param pcb Protocol control block for the TCP connection to send the ACK
|
mbed714 |
0:d616ece2d859
|
838
|
*/
|
mbed714 |
0:d616ece2d859
|
839
|
err_t
|
mbed714 |
0:d616ece2d859
|
840
|
tcp_send_empty_ack(struct tcp_pcb *pcb)
|
mbed714 |
0:d616ece2d859
|
841
|
{
|
mbed714 |
0:d616ece2d859
|
842
|
struct pbuf *p;
|
mbed714 |
0:d616ece2d859
|
843
|
struct tcp_hdr *tcphdr;
|
mbed714 |
0:d616ece2d859
|
844
|
u8_t optlen = 0;
|
mbed714 |
0:d616ece2d859
|
845
|
|
mbed714 |
0:d616ece2d859
|
846
|
#if LWIP_TCP_TIMESTAMPS
|
mbed714 |
0:d616ece2d859
|
847
|
if (pcb->flags & TF_TIMESTAMP) {
|
mbed714 |
0:d616ece2d859
|
848
|
optlen = LWIP_TCP_OPT_LENGTH(TF_SEG_OPTS_TS);
|
mbed714 |
0:d616ece2d859
|
849
|
}
|
mbed714 |
0:d616ece2d859
|
850
|
#endif
|
mbed714 |
0:d616ece2d859
|
851
|
|
mbed714 |
0:d616ece2d859
|
852
|
p = tcp_output_alloc_header(pcb, optlen, 0, htonl(pcb->snd_nxt));
|
mbed714 |
0:d616ece2d859
|
853
|
if (p == NULL) {
|
mbed714 |
0:d616ece2d859
|
854
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output: (ACK) could not allocate pbuf\n"));
|
mbed714 |
0:d616ece2d859
|
855
|
return ERR_BUF;
|
mbed714 |
0:d616ece2d859
|
856
|
}
|
mbed714 |
0:d616ece2d859
|
857
|
tcphdr = (struct tcp_hdr *)p->payload;
|
mbed714 |
0:d616ece2d859
|
858
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG,
|
mbed714 |
0:d616ece2d859
|
859
|
("tcp_output: sending ACK for %"U32_F"\n", pcb->rcv_nxt));
|
mbed714 |
0:d616ece2d859
|
860
|
/* remove ACK flags from the PCB, as we send an empty ACK now */
|
mbed714 |
0:d616ece2d859
|
861
|
pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
|
mbed714 |
0:d616ece2d859
|
862
|
|
mbed714 |
0:d616ece2d859
|
863
|
/* NB. MSS option is only sent on SYNs, so ignore it here */
|
mbed714 |
0:d616ece2d859
|
864
|
#if LWIP_TCP_TIMESTAMPS
|
mbed714 |
0:d616ece2d859
|
865
|
pcb->ts_lastacksent = pcb->rcv_nxt;
|
mbed714 |
0:d616ece2d859
|
866
|
|
mbed714 |
0:d616ece2d859
|
867
|
if (pcb->flags & TF_TIMESTAMP) {
|
mbed714 |
0:d616ece2d859
|
868
|
tcp_build_timestamp_option(pcb, (u32_t *)(tcphdr + 1));
|
mbed714 |
0:d616ece2d859
|
869
|
}
|
mbed714 |
0:d616ece2d859
|
870
|
#endif
|
mbed714 |
0:d616ece2d859
|
871
|
|
mbed714 |
0:d616ece2d859
|
872
|
#if CHECKSUM_GEN_TCP
|
mbed714 |
0:d616ece2d859
|
873
|
tcphdr->chksum = inet_chksum_pseudo(p, &(pcb->local_ip), &(pcb->remote_ip),
|
mbed714 |
0:d616ece2d859
|
874
|
IP_PROTO_TCP, p->tot_len);
|
mbed714 |
0:d616ece2d859
|
875
|
#endif
|
mbed714 |
0:d616ece2d859
|
876
|
#if LWIP_NETIF_HWADDRHINT
|
mbed714 |
0:d616ece2d859
|
877
|
ip_output_hinted(p, &(pcb->local_ip), &(pcb->remote_ip), pcb->ttl, pcb->tos,
|
mbed714 |
0:d616ece2d859
|
878
|
IP_PROTO_TCP, &(pcb->addr_hint));
|
mbed714 |
0:d616ece2d859
|
879
|
#else /* LWIP_NETIF_HWADDRHINT*/
|
mbed714 |
0:d616ece2d859
|
880
|
ip_output(p, &(pcb->local_ip), &(pcb->remote_ip), pcb->ttl, pcb->tos,
|
mbed714 |
0:d616ece2d859
|
881
|
IP_PROTO_TCP);
|
mbed714 |
0:d616ece2d859
|
882
|
#endif /* LWIP_NETIF_HWADDRHINT*/
|
mbed714 |
0:d616ece2d859
|
883
|
pbuf_free(p);
|
mbed714 |
0:d616ece2d859
|
884
|
|
mbed714 |
0:d616ece2d859
|
885
|
return ERR_OK;
|
mbed714 |
0:d616ece2d859
|
886
|
}
|
mbed714 |
0:d616ece2d859
|
887
|
|
mbed714 |
0:d616ece2d859
|
888
|
/**
|
mbed714 |
0:d616ece2d859
|
889
|
* Find out what we can send and send it
|
mbed714 |
0:d616ece2d859
|
890
|
*
|
mbed714 |
0:d616ece2d859
|
891
|
* @param pcb Protocol control block for the TCP connection to send data
|
mbed714 |
0:d616ece2d859
|
892
|
* @return ERR_OK if data has been sent or nothing to send
|
mbed714 |
0:d616ece2d859
|
893
|
* another err_t on error
|
mbed714 |
0:d616ece2d859
|
894
|
*/
|
mbed714 |
0:d616ece2d859
|
895
|
err_t
|
mbed714 |
0:d616ece2d859
|
896
|
tcp_output(struct tcp_pcb *pcb)
|
mbed714 |
0:d616ece2d859
|
897
|
{
|
mbed714 |
0:d616ece2d859
|
898
|
struct tcp_seg *seg, *useg;
|
mbed714 |
0:d616ece2d859
|
899
|
u32_t wnd, snd_nxt;
|
mbed714 |
0:d616ece2d859
|
900
|
#if TCP_CWND_DEBUG
|
mbed714 |
0:d616ece2d859
|
901
|
s16_t i = 0;
|
mbed714 |
0:d616ece2d859
|
902
|
#endif /* TCP_CWND_DEBUG */
|
mbed714 |
0:d616ece2d859
|
903
|
|
mbed714 |
0:d616ece2d859
|
904
|
/* First, check if we are invoked by the TCP input processing
|
mbed714 |
0:d616ece2d859
|
905
|
code. If so, we do not output anything. Instead, we rely on the
|
mbed714 |
0:d616ece2d859
|
906
|
input processing code to call us when input processing is done
|
mbed714 |
0:d616ece2d859
|
907
|
with. */
|
mbed714 |
0:d616ece2d859
|
908
|
if (tcp_input_pcb == pcb) {
|
mbed714 |
0:d616ece2d859
|
909
|
return ERR_OK;
|
mbed714 |
0:d616ece2d859
|
910
|
}
|
mbed714 |
0:d616ece2d859
|
911
|
|
mbed714 |
0:d616ece2d859
|
912
|
wnd = LWIP_MIN(pcb->snd_wnd, pcb->cwnd);
|
mbed714 |
0:d616ece2d859
|
913
|
|
mbed714 |
0:d616ece2d859
|
914
|
seg = pcb->unsent;
|
mbed714 |
0:d616ece2d859
|
915
|
|
mbed714 |
0:d616ece2d859
|
916
|
/* If the TF_ACK_NOW flag is set and no data will be sent (either
|
mbed714 |
0:d616ece2d859
|
917
|
* because the ->unsent queue is empty or because the window does
|
mbed714 |
0:d616ece2d859
|
918
|
* not allow it), construct an empty ACK segment and send it.
|
mbed714 |
0:d616ece2d859
|
919
|
*
|
mbed714 |
0:d616ece2d859
|
920
|
* If data is to be sent, we will just piggyback the ACK (see below).
|
mbed714 |
0:d616ece2d859
|
921
|
*/
|
mbed714 |
0:d616ece2d859
|
922
|
if (pcb->flags & TF_ACK_NOW &&
|
mbed714 |
0:d616ece2d859
|
923
|
(seg == NULL ||
|
mbed714 |
0:d616ece2d859
|
924
|
ntohl(seg->tcphdr->seqno) - pcb->lastack + seg->len > wnd)) {
|
mbed714 |
0:d616ece2d859
|
925
|
return tcp_send_empty_ack(pcb);
|
mbed714 |
0:d616ece2d859
|
926
|
}
|
mbed714 |
0:d616ece2d859
|
927
|
|
mbed714 |
0:d616ece2d859
|
928
|
/* useg should point to last segment on unacked queue */
|
mbed714 |
0:d616ece2d859
|
929
|
useg = pcb->unacked;
|
mbed714 |
0:d616ece2d859
|
930
|
if (useg != NULL) {
|
mbed714 |
0:d616ece2d859
|
931
|
for (; useg->next != NULL; useg = useg->next);
|
mbed714 |
0:d616ece2d859
|
932
|
}
|
mbed714 |
0:d616ece2d859
|
933
|
|
mbed714 |
0:d616ece2d859
|
934
|
#if TCP_OUTPUT_DEBUG
|
mbed714 |
0:d616ece2d859
|
935
|
if (seg == NULL) {
|
mbed714 |
0:d616ece2d859
|
936
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output: nothing to send (%p)\n",
|
mbed714 |
0:d616ece2d859
|
937
|
(void*)pcb->unsent));
|
mbed714 |
0:d616ece2d859
|
938
|
}
|
mbed714 |
0:d616ece2d859
|
939
|
#endif /* TCP_OUTPUT_DEBUG */
|
mbed714 |
0:d616ece2d859
|
940
|
#if TCP_CWND_DEBUG
|
mbed714 |
0:d616ece2d859
|
941
|
if (seg == NULL) {
|
mbed714 |
0:d616ece2d859
|
942
|
LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_output: snd_wnd %"U16_F
|
mbed714 |
0:d616ece2d859
|
943
|
", cwnd %"U16_F", wnd %"U32_F
|
mbed714 |
0:d616ece2d859
|
944
|
", seg == NULL, ack %"U32_F"\n",
|
mbed714 |
0:d616ece2d859
|
945
|
pcb->snd_wnd, pcb->cwnd, wnd, pcb->lastack));
|
mbed714 |
0:d616ece2d859
|
946
|
} else {
|
mbed714 |
0:d616ece2d859
|
947
|
LWIP_DEBUGF(TCP_CWND_DEBUG,
|
mbed714 |
0:d616ece2d859
|
948
|
("tcp_output: snd_wnd %"U16_F", cwnd %"U16_F", wnd %"U32_F
|
mbed714 |
0:d616ece2d859
|
949
|
", effwnd %"U32_F", seq %"U32_F", ack %"U32_F"\n",
|
mbed714 |
0:d616ece2d859
|
950
|
pcb->snd_wnd, pcb->cwnd, wnd,
|
mbed714 |
0:d616ece2d859
|
951
|
ntohl(seg->tcphdr->seqno) - pcb->lastack + seg->len,
|
mbed714 |
0:d616ece2d859
|
952
|
ntohl(seg->tcphdr->seqno), pcb->lastack));
|
mbed714 |
0:d616ece2d859
|
953
|
}
|
mbed714 |
0:d616ece2d859
|
954
|
#endif /* TCP_CWND_DEBUG */
|
mbed714 |
0:d616ece2d859
|
955
|
/* data available and window allows it to be sent? */
|
mbed714 |
0:d616ece2d859
|
956
|
while (seg != NULL &&
|
mbed714 |
0:d616ece2d859
|
957
|
ntohl(seg->tcphdr->seqno) - pcb->lastack + seg->len <= wnd) {
|
mbed714 |
0:d616ece2d859
|
958
|
LWIP_ASSERT("RST not expected here!",
|
mbed714 |
0:d616ece2d859
|
959
|
(TCPH_FLAGS(seg->tcphdr) & TCP_RST) == 0);
|
mbed714 |
0:d616ece2d859
|
960
|
/* Stop sending if the nagle algorithm would prevent it
|
mbed714 |
0:d616ece2d859
|
961
|
* Don't stop:
|
mbed714 |
0:d616ece2d859
|
962
|
* - if tcp_write had a memory error before (prevent delayed ACK timeout) or
|
mbed714 |
0:d616ece2d859
|
963
|
* - if FIN was already enqueued for this PCB (SYN is always alone in a segment -
|
mbed714 |
0:d616ece2d859
|
964
|
* either seg->next != NULL or pcb->unacked == NULL;
|
mbed714 |
0:d616ece2d859
|
965
|
* RST is no sent using tcp_write/tcp_output.
|
mbed714 |
0:d616ece2d859
|
966
|
*/
|
mbed714 |
0:d616ece2d859
|
967
|
if((tcp_do_output_nagle(pcb) == 0) &&
|
mbed714 |
0:d616ece2d859
|
968
|
((pcb->flags & (TF_NAGLEMEMERR | TF_FIN)) == 0)){
|
mbed714 |
0:d616ece2d859
|
969
|
break;
|
mbed714 |
0:d616ece2d859
|
970
|
}
|
mbed714 |
0:d616ece2d859
|
971
|
#if TCP_CWND_DEBUG
|
mbed714 |
0:d616ece2d859
|
972
|
LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_output: snd_wnd %"U16_F", cwnd %"U16_F", wnd %"U32_F", effwnd %"U32_F", seq %"U32_F", ack %"U32_F", i %"S16_F"\n",
|
mbed714 |
0:d616ece2d859
|
973
|
pcb->snd_wnd, pcb->cwnd, wnd,
|
mbed714 |
0:d616ece2d859
|
974
|
ntohl(seg->tcphdr->seqno) + seg->len -
|
mbed714 |
0:d616ece2d859
|
975
|
pcb->lastack,
|
mbed714 |
0:d616ece2d859
|
976
|
ntohl(seg->tcphdr->seqno), pcb->lastack, i));
|
mbed714 |
0:d616ece2d859
|
977
|
++i;
|
mbed714 |
0:d616ece2d859
|
978
|
#endif /* TCP_CWND_DEBUG */
|
mbed714 |
0:d616ece2d859
|
979
|
|
mbed714 |
0:d616ece2d859
|
980
|
pcb->unsent = seg->next;
|
mbed714 |
0:d616ece2d859
|
981
|
|
mbed714 |
0:d616ece2d859
|
982
|
if (pcb->state != SYN_SENT) {
|
mbed714 |
0:d616ece2d859
|
983
|
TCPH_SET_FLAG(seg->tcphdr, TCP_ACK);
|
mbed714 |
0:d616ece2d859
|
984
|
pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
|
mbed714 |
0:d616ece2d859
|
985
|
}
|
mbed714 |
0:d616ece2d859
|
986
|
|
mbed714 |
0:d616ece2d859
|
987
|
tcp_output_segment(seg, pcb);
|
mbed714 |
0:d616ece2d859
|
988
|
|
mbed714 |
0:d616ece2d859
|
989
|
snd_nxt = ntohl(seg->tcphdr->seqno) + TCP_TCPLEN(seg);
|
mbed714 |
0:d616ece2d859
|
990
|
|
mbed714 |
0:d616ece2d859
|
991
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output: pcb->snd_nxt was %"U32_F" seqno=%"U32_F" len=%"U32_F" new snd_nxt=%"U32_F"\n", //DG
|
mbed714 |
0:d616ece2d859
|
992
|
pcb->snd_nxt, ntohl(seg->tcphdr->seqno), TCP_TCPLEN(seg), snd_nxt));
|
mbed714 |
0:d616ece2d859
|
993
|
|
mbed714 |
0:d616ece2d859
|
994
|
if (TCP_SEQ_LT(pcb->snd_nxt, snd_nxt)) {
|
mbed714 |
0:d616ece2d859
|
995
|
pcb->snd_nxt = snd_nxt;
|
mbed714 |
0:d616ece2d859
|
996
|
}
|
mbed714 |
0:d616ece2d859
|
997
|
/* put segment on unacknowledged list if length > 0 */
|
mbed714 |
0:d616ece2d859
|
998
|
if (TCP_TCPLEN(seg) > 0) {
|
mbed714 |
0:d616ece2d859
|
999
|
seg->next = NULL;
|
mbed714 |
0:d616ece2d859
|
1000
|
/* unacked list is empty? */
|
mbed714 |
0:d616ece2d859
|
1001
|
if (pcb->unacked == NULL) {
|
mbed714 |
0:d616ece2d859
|
1002
|
pcb->unacked = seg;
|
mbed714 |
0:d616ece2d859
|
1003
|
useg = seg;
|
mbed714 |
0:d616ece2d859
|
1004
|
/* unacked list is not empty? */
|
mbed714 |
0:d616ece2d859
|
1005
|
} else {
|
mbed714 |
0:d616ece2d859
|
1006
|
/* In the case of fast retransmit, the packet should not go to the tail
|
mbed714 |
0:d616ece2d859
|
1007
|
* of the unacked queue, but rather somewhere before it. We need to check for
|
mbed714 |
0:d616ece2d859
|
1008
|
* this case. -STJ Jul 27, 2004 */
|
mbed714 |
0:d616ece2d859
|
1009
|
if (TCP_SEQ_LT(ntohl(seg->tcphdr->seqno), ntohl(useg->tcphdr->seqno))) {
|
mbed714 |
0:d616ece2d859
|
1010
|
/* add segment to before tail of unacked list, keeping the list sorted */
|
mbed714 |
0:d616ece2d859
|
1011
|
struct tcp_seg **cur_seg = &(pcb->unacked);
|
mbed714 |
0:d616ece2d859
|
1012
|
while (*cur_seg &&
|
mbed714 |
0:d616ece2d859
|
1013
|
TCP_SEQ_LT(ntohl((*cur_seg)->tcphdr->seqno), ntohl(seg->tcphdr->seqno))) {
|
mbed714 |
0:d616ece2d859
|
1014
|
cur_seg = &((*cur_seg)->next );
|
mbed714 |
0:d616ece2d859
|
1015
|
}
|
mbed714 |
0:d616ece2d859
|
1016
|
seg->next = (*cur_seg);
|
mbed714 |
0:d616ece2d859
|
1017
|
(*cur_seg) = seg;
|
mbed714 |
0:d616ece2d859
|
1018
|
} else {
|
mbed714 |
0:d616ece2d859
|
1019
|
/* add segment to tail of unacked list */
|
mbed714 |
0:d616ece2d859
|
1020
|
useg->next = seg;
|
mbed714 |
0:d616ece2d859
|
1021
|
useg = useg->next;
|
mbed714 |
0:d616ece2d859
|
1022
|
}
|
mbed714 |
0:d616ece2d859
|
1023
|
}
|
mbed714 |
0:d616ece2d859
|
1024
|
/* do not queue empty segments on the unacked list */
|
mbed714 |
0:d616ece2d859
|
1025
|
} else {
|
mbed714 |
0:d616ece2d859
|
1026
|
tcp_seg_free(seg);
|
mbed714 |
0:d616ece2d859
|
1027
|
}
|
mbed714 |
0:d616ece2d859
|
1028
|
seg = pcb->unsent;
|
mbed714 |
0:d616ece2d859
|
1029
|
}
|
mbed714 |
0:d616ece2d859
|
1030
|
#if TCP_OVERSIZE
|
mbed714 |
0:d616ece2d859
|
1031
|
if (pcb->unsent == NULL) {
|
mbed714 |
0:d616ece2d859
|
1032
|
/* last unsent has been removed, reset unsent_oversize */
|
mbed714 |
0:d616ece2d859
|
1033
|
pcb->unsent_oversize = 0;
|
mbed714 |
0:d616ece2d859
|
1034
|
}
|
mbed714 |
0:d616ece2d859
|
1035
|
#endif /* TCP_OVERSIZE */
|
mbed714 |
0:d616ece2d859
|
1036
|
|
mbed714 |
0:d616ece2d859
|
1037
|
if (seg != NULL && pcb->persist_backoff == 0 &&
|
mbed714 |
0:d616ece2d859
|
1038
|
ntohl(seg->tcphdr->seqno) - pcb->lastack + seg->len > pcb->snd_wnd) {
|
mbed714 |
0:d616ece2d859
|
1039
|
/* prepare for persist timer */
|
mbed714 |
0:d616ece2d859
|
1040
|
pcb->persist_cnt = 0;
|
mbed714 |
0:d616ece2d859
|
1041
|
pcb->persist_backoff = 1;
|
mbed714 |
0:d616ece2d859
|
1042
|
}
|
mbed714 |
0:d616ece2d859
|
1043
|
|
mbed714 |
0:d616ece2d859
|
1044
|
pcb->flags &= ~TF_NAGLEMEMERR;
|
mbed714 |
0:d616ece2d859
|
1045
|
return ERR_OK;
|
mbed714 |
0:d616ece2d859
|
1046
|
}
|
mbed714 |
0:d616ece2d859
|
1047
|
|
mbed714 |
0:d616ece2d859
|
1048
|
/**
|
mbed714 |
0:d616ece2d859
|
1049
|
* Called by tcp_output() to actually send a TCP segment over IP.
|
mbed714 |
0:d616ece2d859
|
1050
|
*
|
mbed714 |
0:d616ece2d859
|
1051
|
* @param seg the tcp_seg to send
|
mbed714 |
0:d616ece2d859
|
1052
|
* @param pcb the tcp_pcb for the TCP connection used to send the segment
|
mbed714 |
0:d616ece2d859
|
1053
|
*/
|
mbed714 |
0:d616ece2d859
|
1054
|
static void
|
mbed714 |
0:d616ece2d859
|
1055
|
tcp_output_segment(struct tcp_seg *seg, struct tcp_pcb *pcb)
|
mbed714 |
0:d616ece2d859
|
1056
|
{
|
mbed714 |
0:d616ece2d859
|
1057
|
u16_t len;
|
mbed714 |
0:d616ece2d859
|
1058
|
struct netif *netif;
|
mbed714 |
0:d616ece2d859
|
1059
|
u32_t *opts;
|
mbed714 |
0:d616ece2d859
|
1060
|
|
mbed714 |
0:d616ece2d859
|
1061
|
/** @bug Exclude retransmitted segments from this count. */
|
mbed714 |
0:d616ece2d859
|
1062
|
snmp_inc_tcpoutsegs();
|
mbed714 |
0:d616ece2d859
|
1063
|
|
mbed714 |
0:d616ece2d859
|
1064
|
/* The TCP header has already been constructed, but the ackno and
|
mbed714 |
0:d616ece2d859
|
1065
|
wnd fields remain. */
|
mbed714 |
0:d616ece2d859
|
1066
|
seg->tcphdr->ackno = htonl(pcb->rcv_nxt);
|
mbed714 |
0:d616ece2d859
|
1067
|
|
mbed714 |
0:d616ece2d859
|
1068
|
/* advertise our receive window size in this TCP segment */
|
mbed714 |
0:d616ece2d859
|
1069
|
seg->tcphdr->wnd = htons(pcb->rcv_ann_wnd);
|
mbed714 |
0:d616ece2d859
|
1070
|
|
mbed714 |
0:d616ece2d859
|
1071
|
pcb->rcv_ann_right_edge = pcb->rcv_nxt + pcb->rcv_ann_wnd;
|
mbed714 |
0:d616ece2d859
|
1072
|
|
mbed714 |
0:d616ece2d859
|
1073
|
/* Add any requested options. NB MSS option is only set on SYN
|
mbed714 |
0:d616ece2d859
|
1074
|
packets, so ignore it here */
|
mbed714 |
0:d616ece2d859
|
1075
|
LWIP_ASSERT("seg->tcphdr not aligned", ((mem_ptr_t)(seg->tcphdr + 1) % 4) == 0);
|
mbed714 |
0:d616ece2d859
|
1076
|
opts = (u32_t *)(void *)(seg->tcphdr + 1);
|
mbed714 |
0:d616ece2d859
|
1077
|
if (seg->flags & TF_SEG_OPTS_MSS) {
|
mbed714 |
0:d616ece2d859
|
1078
|
TCP_BUILD_MSS_OPTION(*opts);
|
mbed714 |
0:d616ece2d859
|
1079
|
opts += 1;
|
mbed714 |
0:d616ece2d859
|
1080
|
}
|
mbed714 |
0:d616ece2d859
|
1081
|
#if LWIP_TCP_TIMESTAMPS
|
mbed714 |
0:d616ece2d859
|
1082
|
pcb->ts_lastacksent = pcb->rcv_nxt;
|
mbed714 |
0:d616ece2d859
|
1083
|
|
mbed714 |
0:d616ece2d859
|
1084
|
if (seg->flags & TF_SEG_OPTS_TS) {
|
mbed714 |
0:d616ece2d859
|
1085
|
tcp_build_timestamp_option(pcb, opts);
|
mbed714 |
0:d616ece2d859
|
1086
|
opts += 3;
|
mbed714 |
0:d616ece2d859
|
1087
|
}
|
mbed714 |
0:d616ece2d859
|
1088
|
#endif
|
mbed714 |
0:d616ece2d859
|
1089
|
|
mbed714 |
0:d616ece2d859
|
1090
|
/* If we don't have a local IP address, we get one by
|
mbed714 |
0:d616ece2d859
|
1091
|
calling ip_route(). */
|
mbed714 |
0:d616ece2d859
|
1092
|
if (ip_addr_isany(&(pcb->local_ip))) {
|
mbed714 |
0:d616ece2d859
|
1093
|
netif = ip_route(&(pcb->remote_ip));
|
mbed714 |
0:d616ece2d859
|
1094
|
if (netif == NULL) {
|
mbed714 |
0:d616ece2d859
|
1095
|
return;
|
mbed714 |
0:d616ece2d859
|
1096
|
}
|
mbed714 |
0:d616ece2d859
|
1097
|
ip_addr_copy(pcb->local_ip, netif->ip_addr);
|
mbed714 |
0:d616ece2d859
|
1098
|
}
|
mbed714 |
0:d616ece2d859
|
1099
|
|
mbed714 |
0:d616ece2d859
|
1100
|
/* Set retransmission timer running if it is not currently enabled */
|
mbed714 |
0:d616ece2d859
|
1101
|
if(pcb->rtime == -1) {
|
mbed714 |
0:d616ece2d859
|
1102
|
pcb->rtime = 0;
|
mbed714 |
0:d616ece2d859
|
1103
|
}
|
mbed714 |
0:d616ece2d859
|
1104
|
|
mbed714 |
0:d616ece2d859
|
1105
|
if (pcb->rttest == 0) {
|
mbed714 |
0:d616ece2d859
|
1106
|
pcb->rttest = tcp_ticks;
|
mbed714 |
0:d616ece2d859
|
1107
|
pcb->rtseq = ntohl(seg->tcphdr->seqno);
|
mbed714 |
0:d616ece2d859
|
1108
|
|
mbed714 |
0:d616ece2d859
|
1109
|
LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_output_segment: rtseq %"U32_F"\n", pcb->rtseq));
|
mbed714 |
0:d616ece2d859
|
1110
|
}
|
mbed714 |
0:d616ece2d859
|
1111
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output_segment: %"U32_F":%"U32_F"\n",
|
mbed714 |
0:d616ece2d859
|
1112
|
htonl(seg->tcphdr->seqno), htonl(seg->tcphdr->seqno) +
|
mbed714 |
0:d616ece2d859
|
1113
|
seg->len));
|
mbed714 |
0:d616ece2d859
|
1114
|
|
mbed714 |
0:d616ece2d859
|
1115
|
len = (u16_t)((u8_t *)seg->tcphdr - (u8_t *)seg->p->payload);
|
mbed714 |
0:d616ece2d859
|
1116
|
|
mbed714 |
0:d616ece2d859
|
1117
|
seg->p->len -= len;
|
mbed714 |
0:d616ece2d859
|
1118
|
seg->p->tot_len -= len;
|
mbed714 |
0:d616ece2d859
|
1119
|
|
mbed714 |
0:d616ece2d859
|
1120
|
seg->p->payload = seg->tcphdr;
|
mbed714 |
0:d616ece2d859
|
1121
|
|
mbed714 |
0:d616ece2d859
|
1122
|
seg->tcphdr->chksum = 0;
|
mbed714 |
0:d616ece2d859
|
1123
|
#if CHECKSUM_GEN_TCP
|
mbed714 |
0:d616ece2d859
|
1124
|
#if TCP_CHECKSUM_ON_COPY
|
mbed714 |
0:d616ece2d859
|
1125
|
{
|
mbed714 |
0:d616ece2d859
|
1126
|
u32_t acc;
|
mbed714 |
0:d616ece2d859
|
1127
|
#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK
|
mbed714 |
0:d616ece2d859
|
1128
|
u16_t chksum_slow = inet_chksum_pseudo(seg->p, &(pcb->local_ip),
|
mbed714 |
0:d616ece2d859
|
1129
|
&(pcb->remote_ip),
|
mbed714 |
0:d616ece2d859
|
1130
|
IP_PROTO_TCP, seg->p->tot_len);
|
mbed714 |
0:d616ece2d859
|
1131
|
#endif /* TCP_CHECKSUM_ON_COPY_SANITY_CHECK */
|
mbed714 |
0:d616ece2d859
|
1132
|
if ((seg->flags & TF_SEG_DATA_CHECKSUMMED) == 0) {
|
mbed714 |
0:d616ece2d859
|
1133
|
LWIP_ASSERT("data included but not checksummed",
|
mbed714 |
0:d616ece2d859
|
1134
|
seg->p->tot_len == (TCPH_HDRLEN(seg->tcphdr) * 4));
|
mbed714 |
0:d616ece2d859
|
1135
|
}
|
mbed714 |
0:d616ece2d859
|
1136
|
|
mbed714 |
0:d616ece2d859
|
1137
|
/* rebuild TCP header checksum (TCP header changes for retransmissions!) */
|
mbed714 |
0:d616ece2d859
|
1138
|
acc = inet_chksum_pseudo_partial(seg->p, &(pcb->local_ip),
|
mbed714 |
0:d616ece2d859
|
1139
|
&(pcb->remote_ip),
|
mbed714 |
0:d616ece2d859
|
1140
|
IP_PROTO_TCP, seg->p->tot_len, TCPH_HDRLEN(seg->tcphdr) * 4);
|
mbed714 |
0:d616ece2d859
|
1141
|
/* add payload checksum */
|
mbed714 |
0:d616ece2d859
|
1142
|
if (seg->chksum_swapped) {
|
mbed714 |
0:d616ece2d859
|
1143
|
seg->chksum = SWAP_BYTES_IN_WORD(seg->chksum);
|
mbed714 |
0:d616ece2d859
|
1144
|
seg->chksum_swapped = 0;
|
mbed714 |
0:d616ece2d859
|
1145
|
}
|
mbed714 |
0:d616ece2d859
|
1146
|
acc += (u16_t)~(seg->chksum);
|
mbed714 |
0:d616ece2d859
|
1147
|
seg->tcphdr->chksum = FOLD_U32T(acc);
|
mbed714 |
0:d616ece2d859
|
1148
|
#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK
|
mbed714 |
0:d616ece2d859
|
1149
|
if (chksum_slow != seg->tcphdr->chksum) {
|
mbed714 |
0:d616ece2d859
|
1150
|
LWIP_DEBUGF(TCP_DEBUG | LWIP_DBG_LEVEL_WARNING,
|
mbed714 |
0:d616ece2d859
|
1151
|
("tcp_output_segment: calculated checksum is %"X16_F" instead of %"X16_F"\n",
|
mbed714 |
0:d616ece2d859
|
1152
|
seg->tcphdr->chksum, chksum_slow));
|
mbed714 |
0:d616ece2d859
|
1153
|
seg->tcphdr->chksum = chksum_slow;
|
mbed714 |
0:d616ece2d859
|
1154
|
}
|
mbed714 |
0:d616ece2d859
|
1155
|
#endif /* TCP_CHECKSUM_ON_COPY_SANITY_CHECK */
|
mbed714 |
0:d616ece2d859
|
1156
|
}
|
mbed714 |
0:d616ece2d859
|
1157
|
#else /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
1158
|
seg->tcphdr->chksum = inet_chksum_pseudo(seg->p, &(pcb->local_ip),
|
mbed714 |
0:d616ece2d859
|
1159
|
&(pcb->remote_ip),
|
mbed714 |
0:d616ece2d859
|
1160
|
IP_PROTO_TCP, seg->p->tot_len);
|
mbed714 |
0:d616ece2d859
|
1161
|
#endif /* TCP_CHECKSUM_ON_COPY */
|
mbed714 |
0:d616ece2d859
|
1162
|
#endif /* CHECKSUM_GEN_TCP */
|
mbed714 |
0:d616ece2d859
|
1163
|
TCP_STATS_INC(tcp.xmit);
|
mbed714 |
0:d616ece2d859
|
1164
|
|
mbed714 |
0:d616ece2d859
|
1165
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output_segment: Before ip_out seqno = %"U32_F"\n",
|
mbed714 |
0:d616ece2d859
|
1166
|
htonl(seg->tcphdr->seqno))); //DG
|
mbed714 |
0:d616ece2d859
|
1167
|
|
mbed714 |
0:d616ece2d859
|
1168
|
#if LWIP_NETIF_HWADDRHINT
|
mbed714 |
0:d616ece2d859
|
1169
|
ip_output_hinted(seg->p, &(pcb->local_ip), &(pcb->remote_ip), pcb->ttl, pcb->tos,
|
mbed714 |
0:d616ece2d859
|
1170
|
IP_PROTO_TCP, &(pcb->addr_hint));
|
mbed714 |
0:d616ece2d859
|
1171
|
#else /* LWIP_NETIF_HWADDRHINT*/
|
mbed714 |
0:d616ece2d859
|
1172
|
ip_output(seg->p, &(pcb->local_ip), &(pcb->remote_ip), pcb->ttl, pcb->tos,
|
mbed714 |
0:d616ece2d859
|
1173
|
IP_PROTO_TCP);
|
mbed714 |
0:d616ece2d859
|
1174
|
#endif /* LWIP_NETIF_HWADDRHINT*/
|
mbed714 |
0:d616ece2d859
|
1175
|
|
mbed714 |
0:d616ece2d859
|
1176
|
LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output_segment: After ip_out seqno = %"U32_F"\n",
|
mbed714 |
0:d616ece2d859
|
1177
|
htonl(seg->tcphdr->seqno))); //DG
|
mbed714 |
0:d616ece2d859
|
1178
|
|
mbed714 |
0:d616ece2d859
|
1179
|
|
mbed714 |
0:d616ece2d859
|
1180
|
}
|
mbed714 |
0:d616ece2d859
|
1181
|
|
mbed714 |
0:d616ece2d859
|
1182
|
/**
|
mbed714 |
0:d616ece2d859
|
1183
|
* Send a TCP RESET packet (empty segment with RST flag set) either to
|
mbed714 |
0:d616ece2d859
|
1184
|
* abort a connection or to show that there is no matching local connection
|
mbed714 |
0:d616ece2d859
|
1185
|
* for a received segment.
|
mbed714 |
0:d616ece2d859
|
1186
|
*
|
mbed714 |
0:d616ece2d859
|
1187
|
* Called by tcp_abort() (to abort a local connection), tcp_input() (if no
|
mbed714 |
0:d616ece2d859
|
1188
|
* matching local pcb was found), tcp_listen_input() (if incoming segment
|
mbed714 |
0:d616ece2d859
|
1189
|
* has ACK flag set) and tcp_process() (received segment in the wrong state)
|
mbed714 |
0:d616ece2d859
|
1190
|
*
|
mbed714 |
0:d616ece2d859
|
1191
|
* Since a RST segment is in most cases not sent for an active connection,
|
mbed714 |
0:d616ece2d859
|
1192
|
* tcp_rst() has a number of arguments that are taken from a tcp_pcb for
|
mbed714 |
0:d616ece2d859
|
1193
|
* most other segment output functions.
|
mbed714 |
0:d616ece2d859
|
1194
|
*
|
mbed714 |
0:d616ece2d859
|
1195
|
* @param seqno the sequence number to use for the outgoing segment
|
mbed714 |
0:d616ece2d859
|
1196
|
* @param ackno the acknowledge number to use for the outgoing segment
|
mbed714 |
0:d616ece2d859
|
1197
|
* @param local_ip the local IP address to send the segment from
|
mbed714 |
0:d616ece2d859
|
1198
|
* @param remote_ip the remote IP address to send the segment to
|
mbed714 |
0:d616ece2d859
|
1199
|
* @param local_port the local TCP port to send the segment from
|
mbed714 |
0:d616ece2d859
|
1200
|
* @param remote_port the remote TCP port to send the segment to
|
mbed714 |
0:d616ece2d859
|
1201
|
*/
|
mbed714 |
0:d616ece2d859
|
1202
|
void
|
mbed714 |
0:d616ece2d859
|
1203
|
tcp_rst(u32_t seqno, u32_t ackno,
|
mbed714 |
0:d616ece2d859
|
1204
|
ip_addr_t *local_ip, ip_addr_t *remote_ip,
|
mbed714 |
0:d616ece2d859
|
1205
|
u16_t local_port, u16_t remote_port)
|
mbed714 |
0:d616ece2d859
|
1206
|
{
|
mbed714 |
0:d616ece2d859
|
1207
|
struct pbuf *p;
|
mbed714 |
0:d616ece2d859
|
1208
|
struct tcp_hdr *tcphdr;
|
mbed714 |
0:d616ece2d859
|
1209
|
p = pbuf_alloc(PBUF_IP, TCP_HLEN, PBUF_RAM);
|
mbed714 |
0:d616ece2d859
|
1210
|
if (p == NULL) {
|
mbed714 |
0:d616ece2d859
|
1211
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_rst: could not allocate memory for pbuf\n"));
|
mbed714 |
0:d616ece2d859
|
1212
|
return;
|
mbed714 |
0:d616ece2d859
|
1213
|
}
|
mbed714 |
0:d616ece2d859
|
1214
|
LWIP_ASSERT("check that first pbuf can hold struct tcp_hdr",
|
mbed714 |
0:d616ece2d859
|
1215
|
(p->len >= sizeof(struct tcp_hdr)));
|
mbed714 |
0:d616ece2d859
|
1216
|
|
mbed714 |
0:d616ece2d859
|
1217
|
tcphdr = (struct tcp_hdr *)p->payload;
|
mbed714 |
0:d616ece2d859
|
1218
|
tcphdr->src = htons(local_port);
|
mbed714 |
0:d616ece2d859
|
1219
|
tcphdr->dest = htons(remote_port);
|
mbed714 |
0:d616ece2d859
|
1220
|
tcphdr->seqno = htonl(seqno);
|
mbed714 |
0:d616ece2d859
|
1221
|
tcphdr->ackno = htonl(ackno);
|
mbed714 |
0:d616ece2d859
|
1222
|
TCPH_HDRLEN_FLAGS_SET(tcphdr, TCP_HLEN/4, TCP_RST | TCP_ACK);
|
mbed714 |
0:d616ece2d859
|
1223
|
tcphdr->wnd = PP_HTONS(TCP_WND);
|
mbed714 |
0:d616ece2d859
|
1224
|
tcphdr->chksum = 0;
|
mbed714 |
0:d616ece2d859
|
1225
|
tcphdr->urgp = 0;
|
mbed714 |
0:d616ece2d859
|
1226
|
|
mbed714 |
0:d616ece2d859
|
1227
|
#if CHECKSUM_GEN_TCP
|
mbed714 |
0:d616ece2d859
|
1228
|
tcphdr->chksum = inet_chksum_pseudo(p, local_ip, remote_ip,
|
mbed714 |
0:d616ece2d859
|
1229
|
IP_PROTO_TCP, p->tot_len);
|
mbed714 |
0:d616ece2d859
|
1230
|
#endif
|
mbed714 |
0:d616ece2d859
|
1231
|
TCP_STATS_INC(tcp.xmit);
|
mbed714 |
0:d616ece2d859
|
1232
|
snmp_inc_tcpoutrsts();
|
mbed714 |
0:d616ece2d859
|
1233
|
/* Send output with hardcoded TTL since we have no access to the pcb */
|
mbed714 |
0:d616ece2d859
|
1234
|
ip_output(p, local_ip, remote_ip, TCP_TTL, 0, IP_PROTO_TCP);
|
mbed714 |
0:d616ece2d859
|
1235
|
pbuf_free(p);
|
mbed714 |
0:d616ece2d859
|
1236
|
LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_rst: seqno %"U32_F" ackno %"U32_F".\n", seqno, ackno));
|
mbed714 |
0:d616ece2d859
|
1237
|
}
|
mbed714 |
0:d616ece2d859
|
1238
|
|
mbed714 |
0:d616ece2d859
|
1239
|
/**
|
mbed714 |
0:d616ece2d859
|
1240
|
* Requeue all unacked segments for retransmission
|
mbed714 |
0:d616ece2d859
|
1241
|
*
|
mbed714 |
0:d616ece2d859
|
1242
|
* Called by tcp_slowtmr() for slow retransmission.
|
mbed714 |
0:d616ece2d859
|
1243
|
*
|
mbed714 |
0:d616ece2d859
|
1244
|
* @param pcb the tcp_pcb for which to re-enqueue all unacked segments
|
mbed714 |
0:d616ece2d859
|
1245
|
*/
|
mbed714 |
0:d616ece2d859
|
1246
|
void
|
mbed714 |
0:d616ece2d859
|
1247
|
tcp_rexmit_rto(struct tcp_pcb *pcb)
|
mbed714 |
0:d616ece2d859
|
1248
|
{
|
mbed714 |
0:d616ece2d859
|
1249
|
struct tcp_seg *seg;
|
mbed714 |
0:d616ece2d859
|
1250
|
|
mbed714 |
0:d616ece2d859
|
1251
|
if (pcb->unacked == NULL) {
|
mbed714 |
0:d616ece2d859
|
1252
|
return;
|
mbed714 |
0:d616ece2d859
|
1253
|
}
|
mbed714 |
0:d616ece2d859
|
1254
|
|
mbed714 |
0:d616ece2d859
|
1255
|
/* Move all unacked segments to the head of the unsent queue */
|
mbed714 |
0:d616ece2d859
|
1256
|
for (seg = pcb->unacked; seg->next != NULL; seg = seg->next);
|
mbed714 |
0:d616ece2d859
|
1257
|
/* concatenate unsent queue after unacked queue */
|
mbed714 |
0:d616ece2d859
|
1258
|
seg->next = pcb->unsent;
|
mbed714 |
0:d616ece2d859
|
1259
|
/* unsent queue is the concatenated queue (of unacked, unsent) */
|
mbed714 |
0:d616ece2d859
|
1260
|
pcb->unsent = pcb->unacked;
|
mbed714 |
0:d616ece2d859
|
1261
|
/* unacked queue is now empty */
|
mbed714 |
0:d616ece2d859
|
1262
|
pcb->unacked = NULL;
|
mbed714 |
0:d616ece2d859
|
1263
|
|
mbed714 |
0:d616ece2d859
|
1264
|
/* increment number of retransmissions */
|
mbed714 |
0:d616ece2d859
|
1265
|
++pcb->nrtx;
|
mbed714 |
0:d616ece2d859
|
1266
|
|
mbed714 |
0:d616ece2d859
|
1267
|
/* Don't take any RTT measurements after retransmitting. */
|
mbed714 |
0:d616ece2d859
|
1268
|
pcb->rttest = 0;
|
mbed714 |
0:d616ece2d859
|
1269
|
|
mbed714 |
0:d616ece2d859
|
1270
|
/* Do the actual retransmission */
|
mbed714 |
0:d616ece2d859
|
1271
|
tcp_output(pcb);
|
mbed714 |
0:d616ece2d859
|
1272
|
}
|
mbed714 |
0:d616ece2d859
|
1273
|
|
mbed714 |
0:d616ece2d859
|
1274
|
/**
|
mbed714 |
0:d616ece2d859
|
1275
|
* Requeue the first unacked segment for retransmission
|
mbed714 |
0:d616ece2d859
|
1276
|
*
|
mbed714 |
0:d616ece2d859
|
1277
|
* Called by tcp_receive() for fast retramsmit.
|
mbed714 |
0:d616ece2d859
|
1278
|
*
|
mbed714 |
0:d616ece2d859
|
1279
|
* @param pcb the tcp_pcb for which to retransmit the first unacked segment
|
mbed714 |
0:d616ece2d859
|
1280
|
*/
|
mbed714 |
0:d616ece2d859
|
1281
|
void
|
mbed714 |
0:d616ece2d859
|
1282
|
tcp_rexmit(struct tcp_pcb *pcb)
|
mbed714 |
0:d616ece2d859
|
1283
|
{
|
mbed714 |
0:d616ece2d859
|
1284
|
struct tcp_seg *seg;
|
mbed714 |
0:d616ece2d859
|
1285
|
struct tcp_seg **cur_seg;
|
mbed714 |
0:d616ece2d859
|
1286
|
|
mbed714 |
0:d616ece2d859
|
1287
|
if (pcb->unacked == NULL) {
|
mbed714 |
0:d616ece2d859
|
1288
|
return;
|
mbed714 |
0:d616ece2d859
|
1289
|
}
|
mbed714 |
0:d616ece2d859
|
1290
|
|
mbed714 |
0:d616ece2d859
|
1291
|
/* Move the first unacked segment to the unsent queue */
|
mbed714 |
0:d616ece2d859
|
1292
|
/* Keep the unsent queue sorted. */
|
mbed714 |
0:d616ece2d859
|
1293
|
seg = pcb->unacked;
|
mbed714 |
0:d616ece2d859
|
1294
|
pcb->unacked = seg->next;
|
mbed714 |
0:d616ece2d859
|
1295
|
|
mbed714 |
0:d616ece2d859
|
1296
|
cur_seg = &(pcb->unsent);
|
mbed714 |
0:d616ece2d859
|
1297
|
while (*cur_seg &&
|
mbed714 |
0:d616ece2d859
|
1298
|
TCP_SEQ_LT(ntohl((*cur_seg)->tcphdr->seqno), ntohl(seg->tcphdr->seqno))) {
|
mbed714 |
0:d616ece2d859
|
1299
|
cur_seg = &((*cur_seg)->next );
|
mbed714 |
0:d616ece2d859
|
1300
|
}
|
mbed714 |
0:d616ece2d859
|
1301
|
seg->next = *cur_seg;
|
mbed714 |
0:d616ece2d859
|
1302
|
*cur_seg = seg;
|
mbed714 |
0:d616ece2d859
|
1303
|
|
mbed714 |
0:d616ece2d859
|
1304
|
++pcb->nrtx;
|
mbed714 |
0:d616ece2d859
|
1305
|
|
mbed714 |
0:d616ece2d859
|
1306
|
/* Don't take any rtt measurements after retransmitting. */
|
mbed714 |
0:d616ece2d859
|
1307
|
pcb->rttest = 0;
|
mbed714 |
0:d616ece2d859
|
1308
|
|
mbed714 |
0:d616ece2d859
|
1309
|
/* Do the actual retransmission. */
|
mbed714 |
0:d616ece2d859
|
1310
|
snmp_inc_tcpretranssegs();
|
mbed714 |
0:d616ece2d859
|
1311
|
/* No need to call tcp_output: we are always called from tcp_input()
|
mbed714 |
0:d616ece2d859
|
1312
|
and thus tcp_output directly returns. */
|
mbed714 |
0:d616ece2d859
|
1313
|
}
|
mbed714 |
0:d616ece2d859
|
1314
|
|
mbed714 |
0:d616ece2d859
|
1315
|
|
mbed714 |
0:d616ece2d859
|
1316
|
/**
|
mbed714 |
0:d616ece2d859
|
1317
|
* Handle retransmission after three dupacks received
|
mbed714 |
0:d616ece2d859
|
1318
|
*
|
mbed714 |
0:d616ece2d859
|
1319
|
* @param pcb the tcp_pcb for which to retransmit the first unacked segment
|
mbed714 |
0:d616ece2d859
|
1320
|
*/
|
mbed714 |
0:d616ece2d859
|
1321
|
void
|
mbed714 |
0:d616ece2d859
|
1322
|
tcp_rexmit_fast(struct tcp_pcb *pcb)
|
mbed714 |
0:d616ece2d859
|
1323
|
{
|
mbed714 |
0:d616ece2d859
|
1324
|
if (pcb->unacked != NULL && !(pcb->flags & TF_INFR)) {
|
mbed714 |
0:d616ece2d859
|
1325
|
/* This is fast retransmit. Retransmit the first unacked segment. */
|
mbed714 |
0:d616ece2d859
|
1326
|
LWIP_DEBUGF(TCP_FR_DEBUG,
|
mbed714 |
0:d616ece2d859
|
1327
|
("tcp_receive: dupacks %"U16_F" (%"U32_F
|
mbed714 |
0:d616ece2d859
|
1328
|
"), fast retransmit %"U32_F"\n",
|
mbed714 |
0:d616ece2d859
|
1329
|
(u16_t)pcb->dupacks, pcb->lastack,
|
mbed714 |
0:d616ece2d859
|
1330
|
ntohl(pcb->unacked->tcphdr->seqno)));
|
mbed714 |
0:d616ece2d859
|
1331
|
tcp_rexmit(pcb);
|
mbed714 |
0:d616ece2d859
|
1332
|
|
mbed714 |
0:d616ece2d859
|
1333
|
/* Set ssthresh to half of the minimum of the current
|
mbed714 |
0:d616ece2d859
|
1334
|
* cwnd and the advertised window */
|
mbed714 |
0:d616ece2d859
|
1335
|
if (pcb->cwnd > pcb->snd_wnd) {
|
mbed714 |
0:d616ece2d859
|
1336
|
pcb->ssthresh = pcb->snd_wnd / 2;
|
mbed714 |
0:d616ece2d859
|
1337
|
} else {
|
mbed714 |
0:d616ece2d859
|
1338
|
pcb->ssthresh = pcb->cwnd / 2;
|
mbed714 |
0:d616ece2d859
|
1339
|
}
|
mbed714 |
0:d616ece2d859
|
1340
|
|
mbed714 |
0:d616ece2d859
|
1341
|
/* The minimum value for ssthresh should be 2 MSS */
|
mbed714 |
0:d616ece2d859
|
1342
|
if (pcb->ssthresh < 2*pcb->mss) {
|
mbed714 |
0:d616ece2d859
|
1343
|
LWIP_DEBUGF(TCP_FR_DEBUG,
|
mbed714 |
0:d616ece2d859
|
1344
|
("tcp_receive: The minimum value for ssthresh %"U16_F
|
mbed714 |
0:d616ece2d859
|
1345
|
" should be min 2 mss %"U16_F"...\n",
|
mbed714 |
0:d616ece2d859
|
1346
|
pcb->ssthresh, 2*pcb->mss));
|
mbed714 |
0:d616ece2d859
|
1347
|
pcb->ssthresh = 2*pcb->mss;
|
mbed714 |
0:d616ece2d859
|
1348
|
}
|
mbed714 |
0:d616ece2d859
|
1349
|
|
mbed714 |
0:d616ece2d859
|
1350
|
pcb->cwnd = pcb->ssthresh + 3 * pcb->mss;
|
mbed714 |
0:d616ece2d859
|
1351
|
pcb->flags |= TF_INFR;
|
mbed714 |
0:d616ece2d859
|
1352
|
}
|
mbed714 |
0:d616ece2d859
|
1353
|
}
|
mbed714 |
0:d616ece2d859
|
1354
|
|
mbed714 |
0:d616ece2d859
|
1355
|
|
mbed714 |
0:d616ece2d859
|
1356
|
/**
|
mbed714 |
0:d616ece2d859
|
1357
|
* Send keepalive packets to keep a connection active although
|
mbed714 |
0:d616ece2d859
|
1358
|
* no data is sent over it.
|
mbed714 |
0:d616ece2d859
|
1359
|
*
|
mbed714 |
0:d616ece2d859
|
1360
|
* Called by tcp_slowtmr()
|
mbed714 |
0:d616ece2d859
|
1361
|
*
|
mbed714 |
0:d616ece2d859
|
1362
|
* @param pcb the tcp_pcb for which to send a keepalive packet
|
mbed714 |
0:d616ece2d859
|
1363
|
*/
|
mbed714 |
0:d616ece2d859
|
1364
|
void
|
mbed714 |
0:d616ece2d859
|
1365
|
tcp_keepalive(struct tcp_pcb *pcb)
|
mbed714 |
0:d616ece2d859
|
1366
|
{
|
mbed714 |
0:d616ece2d859
|
1367
|
struct pbuf *p;
|
mbed714 |
0:d616ece2d859
|
1368
|
struct tcp_hdr *tcphdr;
|
mbed714 |
0:d616ece2d859
|
1369
|
|
mbed714 |
0:d616ece2d859
|
1370
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_keepalive: sending KEEPALIVE probe to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
mbed714 |
0:d616ece2d859
|
1371
|
ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
|
mbed714 |
0:d616ece2d859
|
1372
|
ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
|
mbed714 |
0:d616ece2d859
|
1373
|
|
mbed714 |
0:d616ece2d859
|
1374
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_keepalive: tcp_ticks %"U32_F" pcb->tmr %"U32_F" pcb->keep_cnt_sent %"U16_F"\n",
|
mbed714 |
0:d616ece2d859
|
1375
|
tcp_ticks, pcb->tmr, pcb->keep_cnt_sent));
|
mbed714 |
0:d616ece2d859
|
1376
|
|
mbed714 |
0:d616ece2d859
|
1377
|
p = tcp_output_alloc_header(pcb, 0, 0, htonl(pcb->snd_nxt - 1));
|
mbed714 |
0:d616ece2d859
|
1378
|
if(p == NULL) {
|
mbed714 |
0:d616ece2d859
|
1379
|
LWIP_DEBUGF(TCP_DEBUG,
|
mbed714 |
0:d616ece2d859
|
1380
|
("tcp_keepalive: could not allocate memory for pbuf\n"));
|
mbed714 |
0:d616ece2d859
|
1381
|
return;
|
mbed714 |
0:d616ece2d859
|
1382
|
}
|
mbed714 |
0:d616ece2d859
|
1383
|
tcphdr = (struct tcp_hdr *)p->payload;
|
mbed714 |
0:d616ece2d859
|
1384
|
|
mbed714 |
0:d616ece2d859
|
1385
|
#if CHECKSUM_GEN_TCP
|
mbed714 |
0:d616ece2d859
|
1386
|
tcphdr->chksum = inet_chksum_pseudo(p, &pcb->local_ip, &pcb->remote_ip,
|
mbed714 |
0:d616ece2d859
|
1387
|
IP_PROTO_TCP, p->tot_len);
|
mbed714 |
0:d616ece2d859
|
1388
|
#endif
|
mbed714 |
0:d616ece2d859
|
1389
|
TCP_STATS_INC(tcp.xmit);
|
mbed714 |
0:d616ece2d859
|
1390
|
|
mbed714 |
0:d616ece2d859
|
1391
|
/* Send output to IP */
|
mbed714 |
0:d616ece2d859
|
1392
|
#if LWIP_NETIF_HWADDRHINT
|
mbed714 |
0:d616ece2d859
|
1393
|
ip_output_hinted(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl, 0, IP_PROTO_TCP,
|
mbed714 |
0:d616ece2d859
|
1394
|
&(pcb->addr_hint));
|
mbed714 |
0:d616ece2d859
|
1395
|
#else /* LWIP_NETIF_HWADDRHINT*/
|
mbed714 |
0:d616ece2d859
|
1396
|
ip_output(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl, 0, IP_PROTO_TCP);
|
mbed714 |
0:d616ece2d859
|
1397
|
#endif /* LWIP_NETIF_HWADDRHINT*/
|
mbed714 |
0:d616ece2d859
|
1398
|
|
mbed714 |
0:d616ece2d859
|
1399
|
pbuf_free(p);
|
mbed714 |
0:d616ece2d859
|
1400
|
|
mbed714 |
0:d616ece2d859
|
1401
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_keepalive: seqno %"U32_F" ackno %"U32_F".\n",
|
mbed714 |
0:d616ece2d859
|
1402
|
pcb->snd_nxt - 1, pcb->rcv_nxt));
|
mbed714 |
0:d616ece2d859
|
1403
|
}
|
mbed714 |
0:d616ece2d859
|
1404
|
|
mbed714 |
0:d616ece2d859
|
1405
|
|
mbed714 |
0:d616ece2d859
|
1406
|
/**
|
mbed714 |
0:d616ece2d859
|
1407
|
* Send persist timer zero-window probes to keep a connection active
|
mbed714 |
0:d616ece2d859
|
1408
|
* when a window update is lost.
|
mbed714 |
0:d616ece2d859
|
1409
|
*
|
mbed714 |
0:d616ece2d859
|
1410
|
* Called by tcp_slowtmr()
|
mbed714 |
0:d616ece2d859
|
1411
|
*
|
mbed714 |
0:d616ece2d859
|
1412
|
* @param pcb the tcp_pcb for which to send a zero-window probe packet
|
mbed714 |
0:d616ece2d859
|
1413
|
*/
|
mbed714 |
0:d616ece2d859
|
1414
|
void
|
mbed714 |
0:d616ece2d859
|
1415
|
tcp_zero_window_probe(struct tcp_pcb *pcb)
|
mbed714 |
0:d616ece2d859
|
1416
|
{
|
mbed714 |
0:d616ece2d859
|
1417
|
struct pbuf *p;
|
mbed714 |
0:d616ece2d859
|
1418
|
struct tcp_hdr *tcphdr;
|
mbed714 |
0:d616ece2d859
|
1419
|
struct tcp_seg *seg;
|
mbed714 |
0:d616ece2d859
|
1420
|
u16_t len;
|
mbed714 |
0:d616ece2d859
|
1421
|
u8_t is_fin;
|
mbed714 |
0:d616ece2d859
|
1422
|
|
mbed714 |
0:d616ece2d859
|
1423
|
LWIP_DEBUGF(TCP_DEBUG,
|
mbed714 |
0:d616ece2d859
|
1424
|
("tcp_zero_window_probe: sending ZERO WINDOW probe to %"
|
mbed714 |
0:d616ece2d859
|
1425
|
U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
|
mbed714 |
0:d616ece2d859
|
1426
|
ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
|
mbed714 |
0:d616ece2d859
|
1427
|
ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
|
mbed714 |
0:d616ece2d859
|
1428
|
|
mbed714 |
0:d616ece2d859
|
1429
|
LWIP_DEBUGF(TCP_DEBUG,
|
mbed714 |
0:d616ece2d859
|
1430
|
("tcp_zero_window_probe: tcp_ticks %"U32_F
|
mbed714 |
0:d616ece2d859
|
1431
|
" pcb->tmr %"U32_F" pcb->keep_cnt_sent %"U16_F"\n",
|
mbed714 |
0:d616ece2d859
|
1432
|
tcp_ticks, pcb->tmr, pcb->keep_cnt_sent));
|
mbed714 |
0:d616ece2d859
|
1433
|
|
mbed714 |
0:d616ece2d859
|
1434
|
seg = pcb->unacked;
|
mbed714 |
0:d616ece2d859
|
1435
|
|
mbed714 |
0:d616ece2d859
|
1436
|
if(seg == NULL) {
|
mbed714 |
0:d616ece2d859
|
1437
|
seg = pcb->unsent;
|
mbed714 |
0:d616ece2d859
|
1438
|
}
|
mbed714 |
0:d616ece2d859
|
1439
|
if(seg == NULL) {
|
mbed714 |
0:d616ece2d859
|
1440
|
return;
|
mbed714 |
0:d616ece2d859
|
1441
|
}
|
mbed714 |
0:d616ece2d859
|
1442
|
|
mbed714 |
0:d616ece2d859
|
1443
|
is_fin = ((TCPH_FLAGS(seg->tcphdr) & TCP_FIN) != 0) && (seg->len == 0);
|
mbed714 |
0:d616ece2d859
|
1444
|
/* we want to send one seqno: either FIN or data (no options) */
|
mbed714 |
0:d616ece2d859
|
1445
|
len = is_fin ? 0 : 1;
|
mbed714 |
0:d616ece2d859
|
1446
|
|
mbed714 |
0:d616ece2d859
|
1447
|
p = tcp_output_alloc_header(pcb, 0, len, seg->tcphdr->seqno);
|
mbed714 |
0:d616ece2d859
|
1448
|
if(p == NULL) {
|
mbed714 |
0:d616ece2d859
|
1449
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_zero_window_probe: no memory for pbuf\n"));
|
mbed714 |
0:d616ece2d859
|
1450
|
return;
|
mbed714 |
0:d616ece2d859
|
1451
|
}
|
mbed714 |
0:d616ece2d859
|
1452
|
tcphdr = (struct tcp_hdr *)p->payload;
|
mbed714 |
0:d616ece2d859
|
1453
|
|
mbed714 |
0:d616ece2d859
|
1454
|
if (is_fin) {
|
mbed714 |
0:d616ece2d859
|
1455
|
/* FIN segment, no data */
|
mbed714 |
0:d616ece2d859
|
1456
|
TCPH_FLAGS_SET(tcphdr, TCP_ACK | TCP_FIN);
|
mbed714 |
0:d616ece2d859
|
1457
|
} else {
|
mbed714 |
0:d616ece2d859
|
1458
|
/* Data segment, copy in one byte from the head of the unacked queue */
|
mbed714 |
0:d616ece2d859
|
1459
|
*((char *)p->payload + TCP_HLEN) = *(char *)seg->dataptr;
|
mbed714 |
0:d616ece2d859
|
1460
|
}
|
mbed714 |
0:d616ece2d859
|
1461
|
|
mbed714 |
0:d616ece2d859
|
1462
|
#if CHECKSUM_GEN_TCP
|
mbed714 |
0:d616ece2d859
|
1463
|
tcphdr->chksum = inet_chksum_pseudo(p, &pcb->local_ip, &pcb->remote_ip,
|
mbed714 |
0:d616ece2d859
|
1464
|
IP_PROTO_TCP, p->tot_len);
|
mbed714 |
0:d616ece2d859
|
1465
|
#endif
|
mbed714 |
0:d616ece2d859
|
1466
|
TCP_STATS_INC(tcp.xmit);
|
mbed714 |
0:d616ece2d859
|
1467
|
|
mbed714 |
0:d616ece2d859
|
1468
|
/* Send output to IP */
|
mbed714 |
0:d616ece2d859
|
1469
|
#if LWIP_NETIF_HWADDRHINT
|
mbed714 |
0:d616ece2d859
|
1470
|
ip_output_hinted(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl, 0, IP_PROTO_TCP,
|
mbed714 |
0:d616ece2d859
|
1471
|
&(pcb->addr_hint));
|
mbed714 |
0:d616ece2d859
|
1472
|
#else /* LWIP_NETIF_HWADDRHINT*/
|
mbed714 |
0:d616ece2d859
|
1473
|
ip_output(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl, 0, IP_PROTO_TCP);
|
mbed714 |
0:d616ece2d859
|
1474
|
#endif /* LWIP_NETIF_HWADDRHINT*/
|
mbed714 |
0:d616ece2d859
|
1475
|
|
mbed714 |
0:d616ece2d859
|
1476
|
pbuf_free(p);
|
mbed714 |
0:d616ece2d859
|
1477
|
|
mbed714 |
0:d616ece2d859
|
1478
|
LWIP_DEBUGF(TCP_DEBUG, ("tcp_zero_window_probe: seqno %"U32_F
|
mbed714 |
0:d616ece2d859
|
1479
|
" ackno %"U32_F".\n",
|
mbed714 |
0:d616ece2d859
|
1480
|
pcb->snd_nxt - 1, pcb->rcv_nxt));
|
mbed714 |
0:d616ece2d859
|
1481
|
}
|
mbed714 |
0:d616ece2d859
|
1482
|
#endif /* LWIP_TCP */
|