ublox_C200Test - Integrating the ublox LISA C200 modem

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Integrating the ublox LISA C200 modem

Fork of SprintUSBModemHTTPClientTest by Donatien Garnier

SprintUSBModem/lwip/core/tcp_in.c@5:3f93dd1d4cb3, 2013-09-26 (annotated)

Committer:: sam_grove
Date:: Thu Sep 26 00:44:20 2013 -0500
Revision:: 5:3f93dd1d4cb3

Exported program and replaced contents of the repo with the source

to build and debug using keil mdk. Libs NOT upto date are lwip, lwip-sys

and socket. these have newer versions under mbed_official but were starting

from a know working point

Who changed what in which revision?

User	Revision	Line number	New contents of line
sam_grove	5:3f93dd1d4cb3	1	/**
sam_grove	5:3f93dd1d4cb3	2	* @file
sam_grove	5:3f93dd1d4cb3	3	* Transmission Control Protocol, incoming traffic
sam_grove	5:3f93dd1d4cb3	4	*
sam_grove	5:3f93dd1d4cb3	5	* The input processing functions of the TCP layer.
sam_grove	5:3f93dd1d4cb3	6	*
sam_grove	5:3f93dd1d4cb3	7	* These functions are generally called in the order (ip_input() ->)
sam_grove	5:3f93dd1d4cb3	8	* tcp_input() -> * tcp_process() -> tcp_receive() (-> application).
sam_grove	5:3f93dd1d4cb3	9	*
sam_grove	5:3f93dd1d4cb3	10	*/
sam_grove	5:3f93dd1d4cb3	11
sam_grove	5:3f93dd1d4cb3	12	/*
sam_grove	5:3f93dd1d4cb3	13	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
sam_grove	5:3f93dd1d4cb3	14	* All rights reserved.
sam_grove	5:3f93dd1d4cb3	15	*
sam_grove	5:3f93dd1d4cb3	16	* Redistribution and use in source and binary forms, with or without modification,
sam_grove	5:3f93dd1d4cb3	17	* are permitted provided that the following conditions are met:
sam_grove	5:3f93dd1d4cb3	18	*
sam_grove	5:3f93dd1d4cb3	19	* 1. Redistributions of source code must retain the above copyright notice,
sam_grove	5:3f93dd1d4cb3	20	* this list of conditions and the following disclaimer.
sam_grove	5:3f93dd1d4cb3	21	* 2. Redistributions in binary form must reproduce the above copyright notice,
sam_grove	5:3f93dd1d4cb3	22	* this list of conditions and the following disclaimer in the documentation
sam_grove	5:3f93dd1d4cb3	23	* and/or other materials provided with the distribution.
sam_grove	5:3f93dd1d4cb3	24	* 3. The name of the author may not be used to endorse or promote products
sam_grove	5:3f93dd1d4cb3	25	* derived from this software without specific prior written permission.
sam_grove	5:3f93dd1d4cb3	26	*
sam_grove	5:3f93dd1d4cb3	27	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
sam_grove	5:3f93dd1d4cb3	28	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
sam_grove	5:3f93dd1d4cb3	29	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
sam_grove	5:3f93dd1d4cb3	30	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
sam_grove	5:3f93dd1d4cb3	31	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
sam_grove	5:3f93dd1d4cb3	32	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
sam_grove	5:3f93dd1d4cb3	33	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
sam_grove	5:3f93dd1d4cb3	34	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
sam_grove	5:3f93dd1d4cb3	35	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
sam_grove	5:3f93dd1d4cb3	36	* OF SUCH DAMAGE.
sam_grove	5:3f93dd1d4cb3	37	*
sam_grove	5:3f93dd1d4cb3	38	* This file is part of the lwIP TCP/IP stack.
sam_grove	5:3f93dd1d4cb3	39	*
sam_grove	5:3f93dd1d4cb3	40	* Author: Adam Dunkels <adam@sics.se>
sam_grove	5:3f93dd1d4cb3	41	*
sam_grove	5:3f93dd1d4cb3	42	*/
sam_grove	5:3f93dd1d4cb3	43
sam_grove	5:3f93dd1d4cb3	44	#include "lwip/opt.h"
sam_grove	5:3f93dd1d4cb3	45
sam_grove	5:3f93dd1d4cb3	46	#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
sam_grove	5:3f93dd1d4cb3	47
sam_grove	5:3f93dd1d4cb3	48	#include "lwip/tcp_impl.h"
sam_grove	5:3f93dd1d4cb3	49	#include "lwip/def.h"
sam_grove	5:3f93dd1d4cb3	50	#include "lwip/ip_addr.h"
sam_grove	5:3f93dd1d4cb3	51	#include "lwip/netif.h"
sam_grove	5:3f93dd1d4cb3	52	#include "lwip/mem.h"
sam_grove	5:3f93dd1d4cb3	53	#include "lwip/memp.h"
sam_grove	5:3f93dd1d4cb3	54	#include "lwip/inet_chksum.h"
sam_grove	5:3f93dd1d4cb3	55	#include "lwip/stats.h"
sam_grove	5:3f93dd1d4cb3	56	#include "lwip/snmp.h"
sam_grove	5:3f93dd1d4cb3	57	#include "arch/perf.h"
sam_grove	5:3f93dd1d4cb3	58
sam_grove	5:3f93dd1d4cb3	59	/* These variables are global to all functions involved in the input
sam_grove	5:3f93dd1d4cb3	60	processing of TCP segments. They are set by the tcp_input()
sam_grove	5:3f93dd1d4cb3	61	function. */
sam_grove	5:3f93dd1d4cb3	62	static struct tcp_seg inseg;
sam_grove	5:3f93dd1d4cb3	63	static struct tcp_hdr *tcphdr;
sam_grove	5:3f93dd1d4cb3	64	static struct ip_hdr *iphdr;
sam_grove	5:3f93dd1d4cb3	65	static u32_t seqno, ackno;
sam_grove	5:3f93dd1d4cb3	66	static u8_t flags;
sam_grove	5:3f93dd1d4cb3	67	static u16_t tcplen;
sam_grove	5:3f93dd1d4cb3	68
sam_grove	5:3f93dd1d4cb3	69	static u8_t recv_flags;
sam_grove	5:3f93dd1d4cb3	70	static struct pbuf *recv_data;
sam_grove	5:3f93dd1d4cb3	71
sam_grove	5:3f93dd1d4cb3	72	struct tcp_pcb *tcp_input_pcb;
sam_grove	5:3f93dd1d4cb3	73
sam_grove	5:3f93dd1d4cb3	74	/* Forward declarations. */
sam_grove	5:3f93dd1d4cb3	75	static err_t tcp_process(struct tcp_pcb *pcb);
sam_grove	5:3f93dd1d4cb3	76	static void tcp_receive(struct tcp_pcb *pcb);
sam_grove	5:3f93dd1d4cb3	77	static void tcp_parseopt(struct tcp_pcb *pcb);
sam_grove	5:3f93dd1d4cb3	78
sam_grove	5:3f93dd1d4cb3	79	static err_t tcp_listen_input(struct tcp_pcb_listen *pcb);
sam_grove	5:3f93dd1d4cb3	80	static err_t tcp_timewait_input(struct tcp_pcb *pcb);
sam_grove	5:3f93dd1d4cb3	81
sam_grove	5:3f93dd1d4cb3	82	/**
sam_grove	5:3f93dd1d4cb3	83	* The initial input processing of TCP. It verifies the TCP header, demultiplexes
sam_grove	5:3f93dd1d4cb3	84	* the segment between the PCBs and passes it on to tcp_process(), which implements
sam_grove	5:3f93dd1d4cb3	85	* the TCP finite state machine. This function is called by the IP layer (in
sam_grove	5:3f93dd1d4cb3	86	* ip_input()).
sam_grove	5:3f93dd1d4cb3	87	*
sam_grove	5:3f93dd1d4cb3	88	* @param p received TCP segment to process (p->payload pointing to the IP header)
sam_grove	5:3f93dd1d4cb3	89	* @param inp network interface on which this segment was received
sam_grove	5:3f93dd1d4cb3	90	*/
sam_grove	5:3f93dd1d4cb3	91	void
sam_grove	5:3f93dd1d4cb3	92	tcp_input(struct pbuf p, struct netif inp)
sam_grove	5:3f93dd1d4cb3	93	{
sam_grove	5:3f93dd1d4cb3	94	struct tcp_pcb pcb, prev;
sam_grove	5:3f93dd1d4cb3	95	struct tcp_pcb_listen *lpcb;
sam_grove	5:3f93dd1d4cb3	96	#if SO_REUSE
sam_grove	5:3f93dd1d4cb3	97	struct tcp_pcb *lpcb_prev = NULL;
sam_grove	5:3f93dd1d4cb3	98	struct tcp_pcb_listen *lpcb_any = NULL;
sam_grove	5:3f93dd1d4cb3	99	#endif /* SO_REUSE */
sam_grove	5:3f93dd1d4cb3	100	u8_t hdrlen;
sam_grove	5:3f93dd1d4cb3	101	err_t err;
sam_grove	5:3f93dd1d4cb3	102
sam_grove	5:3f93dd1d4cb3	103	PERF_START;
sam_grove	5:3f93dd1d4cb3	104
sam_grove	5:3f93dd1d4cb3	105	TCP_STATS_INC(tcp.recv);
sam_grove	5:3f93dd1d4cb3	106	snmp_inc_tcpinsegs();
sam_grove	5:3f93dd1d4cb3	107
sam_grove	5:3f93dd1d4cb3	108	iphdr = (struct ip_hdr *)p->payload;
sam_grove	5:3f93dd1d4cb3	109	tcphdr = (struct tcp_hdr )((u8_t )p->payload + IPH_HL(iphdr) * 4);
sam_grove	5:3f93dd1d4cb3	110
sam_grove	5:3f93dd1d4cb3	111	#if TCP_INPUT_DEBUG
sam_grove	5:3f93dd1d4cb3	112	tcp_debug_print(tcphdr);
sam_grove	5:3f93dd1d4cb3	113	#endif
sam_grove	5:3f93dd1d4cb3	114
sam_grove	5:3f93dd1d4cb3	115	/* remove header from payload */
sam_grove	5:3f93dd1d4cb3	116	if (pbuf_header(p, -((s16_t)(IPH_HL(iphdr) * 4))) \|\| (p->tot_len < sizeof(struct tcp_hdr))) {
sam_grove	5:3f93dd1d4cb3	117	/* drop short packets */
sam_grove	5:3f93dd1d4cb3	118	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: short packet (%"U16_F" bytes) discarded\n", p->tot_len));
sam_grove	5:3f93dd1d4cb3	119	TCP_STATS_INC(tcp.lenerr);
sam_grove	5:3f93dd1d4cb3	120	TCP_STATS_INC(tcp.drop);
sam_grove	5:3f93dd1d4cb3	121	snmp_inc_tcpinerrs();
sam_grove	5:3f93dd1d4cb3	122	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	123	return;
sam_grove	5:3f93dd1d4cb3	124	}
sam_grove	5:3f93dd1d4cb3	125
sam_grove	5:3f93dd1d4cb3	126	/* Don't even process incoming broadcasts/multicasts. */
sam_grove	5:3f93dd1d4cb3	127	if (ip_addr_isbroadcast(&current_iphdr_dest, inp) \|\|
sam_grove	5:3f93dd1d4cb3	128	ip_addr_ismulticast(&current_iphdr_dest)) {
sam_grove	5:3f93dd1d4cb3	129	TCP_STATS_INC(tcp.proterr);
sam_grove	5:3f93dd1d4cb3	130	TCP_STATS_INC(tcp.drop);
sam_grove	5:3f93dd1d4cb3	131	snmp_inc_tcpinerrs();
sam_grove	5:3f93dd1d4cb3	132	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	133	return;
sam_grove	5:3f93dd1d4cb3	134	}
sam_grove	5:3f93dd1d4cb3	135
sam_grove	5:3f93dd1d4cb3	136	#if CHECKSUM_CHECK_TCP
sam_grove	5:3f93dd1d4cb3	137	/* Verify TCP checksum. */
sam_grove	5:3f93dd1d4cb3	138	if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
sam_grove	5:3f93dd1d4cb3	139	IP_PROTO_TCP, p->tot_len) != 0) {
sam_grove	5:3f93dd1d4cb3	140	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: packet discarded due to failing checksum 0x%04"X16_F"\n",
sam_grove	5:3f93dd1d4cb3	141	inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
sam_grove	5:3f93dd1d4cb3	142	IP_PROTO_TCP, p->tot_len)));
sam_grove	5:3f93dd1d4cb3	143	#if TCP_DEBUG
sam_grove	5:3f93dd1d4cb3	144	tcp_debug_print(tcphdr);
sam_grove	5:3f93dd1d4cb3	145	#endif /* TCP_DEBUG */
sam_grove	5:3f93dd1d4cb3	146	TCP_STATS_INC(tcp.chkerr);
sam_grove	5:3f93dd1d4cb3	147	TCP_STATS_INC(tcp.drop);
sam_grove	5:3f93dd1d4cb3	148	snmp_inc_tcpinerrs();
sam_grove	5:3f93dd1d4cb3	149	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	150	return;
sam_grove	5:3f93dd1d4cb3	151	}
sam_grove	5:3f93dd1d4cb3	152	#endif
sam_grove	5:3f93dd1d4cb3	153
sam_grove	5:3f93dd1d4cb3	154	/* Move the payload pointer in the pbuf so that it points to the
sam_grove	5:3f93dd1d4cb3	155	TCP data instead of the TCP header. */
sam_grove	5:3f93dd1d4cb3	156	hdrlen = TCPH_HDRLEN(tcphdr);
sam_grove	5:3f93dd1d4cb3	157	if(pbuf_header(p, -(hdrlen * 4))){
sam_grove	5:3f93dd1d4cb3	158	/* drop short packets */
sam_grove	5:3f93dd1d4cb3	159	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: short packet\n"));
sam_grove	5:3f93dd1d4cb3	160	TCP_STATS_INC(tcp.lenerr);
sam_grove	5:3f93dd1d4cb3	161	TCP_STATS_INC(tcp.drop);
sam_grove	5:3f93dd1d4cb3	162	snmp_inc_tcpinerrs();
sam_grove	5:3f93dd1d4cb3	163	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	164	return;
sam_grove	5:3f93dd1d4cb3	165	}
sam_grove	5:3f93dd1d4cb3	166
sam_grove	5:3f93dd1d4cb3	167	/* Convert fields in TCP header to host byte order. */
sam_grove	5:3f93dd1d4cb3	168	tcphdr->src = ntohs(tcphdr->src);
sam_grove	5:3f93dd1d4cb3	169	tcphdr->dest = ntohs(tcphdr->dest);
sam_grove	5:3f93dd1d4cb3	170	seqno = tcphdr->seqno = ntohl(tcphdr->seqno);
sam_grove	5:3f93dd1d4cb3	171	ackno = tcphdr->ackno = ntohl(tcphdr->ackno);
sam_grove	5:3f93dd1d4cb3	172	tcphdr->wnd = ntohs(tcphdr->wnd);
sam_grove	5:3f93dd1d4cb3	173
sam_grove	5:3f93dd1d4cb3	174	flags = TCPH_FLAGS(tcphdr);
sam_grove	5:3f93dd1d4cb3	175	tcplen = p->tot_len + ((flags & (TCP_FIN \| TCP_SYN)) ? 1 : 0);
sam_grove	5:3f93dd1d4cb3	176
sam_grove	5:3f93dd1d4cb3	177	/* Demultiplex an incoming segment. First, we check if it is destined
sam_grove	5:3f93dd1d4cb3	178	for an active connection. */
sam_grove	5:3f93dd1d4cb3	179	prev = NULL;
sam_grove	5:3f93dd1d4cb3	180
sam_grove	5:3f93dd1d4cb3	181
sam_grove	5:3f93dd1d4cb3	182	for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	183	LWIP_ASSERT("tcp_input: active pcb->state != CLOSED", pcb->state != CLOSED);
sam_grove	5:3f93dd1d4cb3	184	LWIP_ASSERT("tcp_input: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
sam_grove	5:3f93dd1d4cb3	185	LWIP_ASSERT("tcp_input: active pcb->state != LISTEN", pcb->state != LISTEN);
sam_grove	5:3f93dd1d4cb3	186	if (pcb->remote_port == tcphdr->src &&
sam_grove	5:3f93dd1d4cb3	187	pcb->local_port == tcphdr->dest &&
sam_grove	5:3f93dd1d4cb3	188	ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src) &&
sam_grove	5:3f93dd1d4cb3	189	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest)) {
sam_grove	5:3f93dd1d4cb3	190
sam_grove	5:3f93dd1d4cb3	191	/* Move this PCB to the front of the list so that subsequent
sam_grove	5:3f93dd1d4cb3	192	lookups will be faster (we exploit locality in TCP segment
sam_grove	5:3f93dd1d4cb3	193	arrivals). */
sam_grove	5:3f93dd1d4cb3	194	LWIP_ASSERT("tcp_input: pcb->next != pcb (before cache)", pcb->next != pcb);
sam_grove	5:3f93dd1d4cb3	195	if (prev != NULL) {
sam_grove	5:3f93dd1d4cb3	196	prev->next = pcb->next;
sam_grove	5:3f93dd1d4cb3	197	pcb->next = tcp_active_pcbs;
sam_grove	5:3f93dd1d4cb3	198	tcp_active_pcbs = pcb;
sam_grove	5:3f93dd1d4cb3	199	}
sam_grove	5:3f93dd1d4cb3	200	LWIP_ASSERT("tcp_input: pcb->next != pcb (after cache)", pcb->next != pcb);
sam_grove	5:3f93dd1d4cb3	201	break;
sam_grove	5:3f93dd1d4cb3	202	}
sam_grove	5:3f93dd1d4cb3	203	prev = pcb;
sam_grove	5:3f93dd1d4cb3	204	}
sam_grove	5:3f93dd1d4cb3	205
sam_grove	5:3f93dd1d4cb3	206	if (pcb == NULL) {
sam_grove	5:3f93dd1d4cb3	207	/* If it did not go to an active connection, we check the connections
sam_grove	5:3f93dd1d4cb3	208	in the TIME-WAIT state. */
sam_grove	5:3f93dd1d4cb3	209	for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
sam_grove	5:3f93dd1d4cb3	210	LWIP_ASSERT("tcp_input: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
sam_grove	5:3f93dd1d4cb3	211	if (pcb->remote_port == tcphdr->src &&
sam_grove	5:3f93dd1d4cb3	212	pcb->local_port == tcphdr->dest &&
sam_grove	5:3f93dd1d4cb3	213	ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src) &&
sam_grove	5:3f93dd1d4cb3	214	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest)) {
sam_grove	5:3f93dd1d4cb3	215	/* We don't really care enough to move this PCB to the front
sam_grove	5:3f93dd1d4cb3	216	of the list since we are not very likely to receive that
sam_grove	5:3f93dd1d4cb3	217	many segments for connections in TIME-WAIT. */
sam_grove	5:3f93dd1d4cb3	218	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: packed for TIME_WAITing connection.\n"));
sam_grove	5:3f93dd1d4cb3	219	tcp_timewait_input(pcb);
sam_grove	5:3f93dd1d4cb3	220	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	221	return;
sam_grove	5:3f93dd1d4cb3	222	}
sam_grove	5:3f93dd1d4cb3	223	}
sam_grove	5:3f93dd1d4cb3	224
sam_grove	5:3f93dd1d4cb3	225	/* Finally, if we still did not get a match, we check all PCBs that
sam_grove	5:3f93dd1d4cb3	226	are LISTENing for incoming connections. */
sam_grove	5:3f93dd1d4cb3	227	prev = NULL;
sam_grove	5:3f93dd1d4cb3	228	for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
sam_grove	5:3f93dd1d4cb3	229	if (lpcb->local_port == tcphdr->dest) {
sam_grove	5:3f93dd1d4cb3	230	#if SO_REUSE
sam_grove	5:3f93dd1d4cb3	231	if (ip_addr_cmp(&(lpcb->local_ip), &current_iphdr_dest)) {
sam_grove	5:3f93dd1d4cb3	232	/* found an exact match */
sam_grove	5:3f93dd1d4cb3	233	break;
sam_grove	5:3f93dd1d4cb3	234	} else if(ip_addr_isany(&(lpcb->local_ip))) {
sam_grove	5:3f93dd1d4cb3	235	/* found an ANY-match */
sam_grove	5:3f93dd1d4cb3	236	lpcb_any = lpcb;
sam_grove	5:3f93dd1d4cb3	237	lpcb_prev = prev;
sam_grove	5:3f93dd1d4cb3	238	}
sam_grove	5:3f93dd1d4cb3	239	#else /* SO_REUSE */
sam_grove	5:3f93dd1d4cb3	240	if (ip_addr_cmp(&(lpcb->local_ip), &current_iphdr_dest) \|\|
sam_grove	5:3f93dd1d4cb3	241	ip_addr_isany(&(lpcb->local_ip))) {
sam_grove	5:3f93dd1d4cb3	242	/* found a match */
sam_grove	5:3f93dd1d4cb3	243	break;
sam_grove	5:3f93dd1d4cb3	244	}
sam_grove	5:3f93dd1d4cb3	245	#endif /* SO_REUSE */
sam_grove	5:3f93dd1d4cb3	246	}
sam_grove	5:3f93dd1d4cb3	247	prev = (struct tcp_pcb *)lpcb;
sam_grove	5:3f93dd1d4cb3	248	}
sam_grove	5:3f93dd1d4cb3	249	#if SO_REUSE
sam_grove	5:3f93dd1d4cb3	250	/* first try specific local IP */
sam_grove	5:3f93dd1d4cb3	251	if (lpcb == NULL) {
sam_grove	5:3f93dd1d4cb3	252	/* only pass to ANY if no specific local IP has been found */
sam_grove	5:3f93dd1d4cb3	253	lpcb = lpcb_any;
sam_grove	5:3f93dd1d4cb3	254	prev = lpcb_prev;
sam_grove	5:3f93dd1d4cb3	255	}
sam_grove	5:3f93dd1d4cb3	256	#endif /* SO_REUSE */
sam_grove	5:3f93dd1d4cb3	257	if (lpcb != NULL) {
sam_grove	5:3f93dd1d4cb3	258	/* Move this PCB to the front of the list so that subsequent
sam_grove	5:3f93dd1d4cb3	259	lookups will be faster (we exploit locality in TCP segment
sam_grove	5:3f93dd1d4cb3	260	arrivals). */
sam_grove	5:3f93dd1d4cb3	261	if (prev != NULL) {
sam_grove	5:3f93dd1d4cb3	262	((struct tcp_pcb_listen *)prev)->next = lpcb->next;
sam_grove	5:3f93dd1d4cb3	263	/* our successor is the remainder of the listening list */
sam_grove	5:3f93dd1d4cb3	264	lpcb->next = tcp_listen_pcbs.listen_pcbs;
sam_grove	5:3f93dd1d4cb3	265	/* put this listening pcb at the head of the listening list */
sam_grove	5:3f93dd1d4cb3	266	tcp_listen_pcbs.listen_pcbs = lpcb;
sam_grove	5:3f93dd1d4cb3	267	}
sam_grove	5:3f93dd1d4cb3	268
sam_grove	5:3f93dd1d4cb3	269	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: packed for LISTENing connection.\n"));
sam_grove	5:3f93dd1d4cb3	270	tcp_listen_input(lpcb);
sam_grove	5:3f93dd1d4cb3	271	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	272	return;
sam_grove	5:3f93dd1d4cb3	273	}
sam_grove	5:3f93dd1d4cb3	274	}
sam_grove	5:3f93dd1d4cb3	275
sam_grove	5:3f93dd1d4cb3	276	#if TCP_INPUT_DEBUG
sam_grove	5:3f93dd1d4cb3	277	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags "));
sam_grove	5:3f93dd1d4cb3	278	tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
sam_grove	5:3f93dd1d4cb3	279	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n"));
sam_grove	5:3f93dd1d4cb3	280	#endif /* TCP_INPUT_DEBUG */
sam_grove	5:3f93dd1d4cb3	281
sam_grove	5:3f93dd1d4cb3	282
sam_grove	5:3f93dd1d4cb3	283	if (pcb != NULL) {
sam_grove	5:3f93dd1d4cb3	284	/* The incoming segment belongs to a connection. */
sam_grove	5:3f93dd1d4cb3	285	#if TCP_INPUT_DEBUG
sam_grove	5:3f93dd1d4cb3	286	#if TCP_DEBUG
sam_grove	5:3f93dd1d4cb3	287	tcp_debug_print_state(pcb->state);
sam_grove	5:3f93dd1d4cb3	288	#endif /* TCP_DEBUG */
sam_grove	5:3f93dd1d4cb3	289	#endif /* TCP_INPUT_DEBUG */
sam_grove	5:3f93dd1d4cb3	290
sam_grove	5:3f93dd1d4cb3	291	/* Set up a tcp_seg structure. */
sam_grove	5:3f93dd1d4cb3	292	inseg.next = NULL;
sam_grove	5:3f93dd1d4cb3	293	inseg.len = p->tot_len;
sam_grove	5:3f93dd1d4cb3	294	inseg.p = p;
sam_grove	5:3f93dd1d4cb3	295	inseg.tcphdr = tcphdr;
sam_grove	5:3f93dd1d4cb3	296
sam_grove	5:3f93dd1d4cb3	297	recv_data = NULL;
sam_grove	5:3f93dd1d4cb3	298	recv_flags = 0;
sam_grove	5:3f93dd1d4cb3	299
sam_grove	5:3f93dd1d4cb3	300	/* If there is data which was previously "refused" by upper layer */
sam_grove	5:3f93dd1d4cb3	301	if (pcb->refused_data != NULL) {
sam_grove	5:3f93dd1d4cb3	302	/* Notify again application with data previously received. */
sam_grove	5:3f93dd1d4cb3	303	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: notify kept packet\n"));
sam_grove	5:3f93dd1d4cb3	304	TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
sam_grove	5:3f93dd1d4cb3	305	if (err == ERR_OK) {
sam_grove	5:3f93dd1d4cb3	306	pcb->refused_data = NULL;
sam_grove	5:3f93dd1d4cb3	307	} else if ((err == ERR_ABRT) \|\| (tcplen > 0)) {
sam_grove	5:3f93dd1d4cb3	308	/* if err == ERR_ABRT, 'pcb' is already deallocated */
sam_grove	5:3f93dd1d4cb3	309	/* Drop incoming packets because pcb is "full" (only if the incoming
sam_grove	5:3f93dd1d4cb3	310	segment contains data). */
sam_grove	5:3f93dd1d4cb3	311	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: drop incoming packets, because pcb is \"full\"\n"));
sam_grove	5:3f93dd1d4cb3	312	TCP_STATS_INC(tcp.drop);
sam_grove	5:3f93dd1d4cb3	313	snmp_inc_tcpinerrs();
sam_grove	5:3f93dd1d4cb3	314	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	315	return;
sam_grove	5:3f93dd1d4cb3	316	}
sam_grove	5:3f93dd1d4cb3	317	}
sam_grove	5:3f93dd1d4cb3	318	tcp_input_pcb = pcb;
sam_grove	5:3f93dd1d4cb3	319	err = tcp_process(pcb);
sam_grove	5:3f93dd1d4cb3	320	/* A return value of ERR_ABRT means that tcp_abort() was called
sam_grove	5:3f93dd1d4cb3	321	and that the pcb has been freed. If so, we don't do anything. */
sam_grove	5:3f93dd1d4cb3	322	if (err != ERR_ABRT) {
sam_grove	5:3f93dd1d4cb3	323	if (recv_flags & TF_RESET) {
sam_grove	5:3f93dd1d4cb3	324	/* TF_RESET means that the connection was reset by the other
sam_grove	5:3f93dd1d4cb3	325	end. We then call the error callback to inform the
sam_grove	5:3f93dd1d4cb3	326	application that the connection is dead before we
sam_grove	5:3f93dd1d4cb3	327	deallocate the PCB. */
sam_grove	5:3f93dd1d4cb3	328	TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_RST);
sam_grove	5:3f93dd1d4cb3	329	tcp_pcb_remove(&tcp_active_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	330	memp_free(MEMP_TCP_PCB, pcb);
sam_grove	5:3f93dd1d4cb3	331	} else if (recv_flags & TF_CLOSED) {
sam_grove	5:3f93dd1d4cb3	332	/* The connection has been closed and we will deallocate the
sam_grove	5:3f93dd1d4cb3	333	PCB. */
sam_grove	5:3f93dd1d4cb3	334	tcp_pcb_remove(&tcp_active_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	335	memp_free(MEMP_TCP_PCB, pcb);
sam_grove	5:3f93dd1d4cb3	336	} else {
sam_grove	5:3f93dd1d4cb3	337	err = ERR_OK;
sam_grove	5:3f93dd1d4cb3	338	/* If the application has registered a "sent" function to be
sam_grove	5:3f93dd1d4cb3	339	called when new send buffer space is available, we call it
sam_grove	5:3f93dd1d4cb3	340	now. */
sam_grove	5:3f93dd1d4cb3	341	if (pcb->acked > 0) {
sam_grove	5:3f93dd1d4cb3	342	TCP_EVENT_SENT(pcb, pcb->acked, err);
sam_grove	5:3f93dd1d4cb3	343	if (err == ERR_ABRT) {
sam_grove	5:3f93dd1d4cb3	344	goto aborted;
sam_grove	5:3f93dd1d4cb3	345	}
sam_grove	5:3f93dd1d4cb3	346	}
sam_grove	5:3f93dd1d4cb3	347
sam_grove	5:3f93dd1d4cb3	348	if (recv_data != NULL) {
sam_grove	5:3f93dd1d4cb3	349	LWIP_ASSERT("pcb->refused_data == NULL", pcb->refused_data == NULL);
sam_grove	5:3f93dd1d4cb3	350	if (pcb->flags & TF_RXCLOSED) {
sam_grove	5:3f93dd1d4cb3	351	/* received data although already closed -> abort (send RST) to
sam_grove	5:3f93dd1d4cb3	352	notify the remote host that not all data has been processed */
sam_grove	5:3f93dd1d4cb3	353	pbuf_free(recv_data);
sam_grove	5:3f93dd1d4cb3	354	tcp_abort(pcb);
sam_grove	5:3f93dd1d4cb3	355	goto aborted;
sam_grove	5:3f93dd1d4cb3	356	}
sam_grove	5:3f93dd1d4cb3	357	if (flags & TCP_PSH) {
sam_grove	5:3f93dd1d4cb3	358	recv_data->flags \|= PBUF_FLAG_PUSH;
sam_grove	5:3f93dd1d4cb3	359	}
sam_grove	5:3f93dd1d4cb3	360
sam_grove	5:3f93dd1d4cb3	361	/* Notify application that data has been received. */
sam_grove	5:3f93dd1d4cb3	362	TCP_EVENT_RECV(pcb, recv_data, ERR_OK, err);
sam_grove	5:3f93dd1d4cb3	363	if (err == ERR_ABRT) {
sam_grove	5:3f93dd1d4cb3	364	goto aborted;
sam_grove	5:3f93dd1d4cb3	365	}
sam_grove	5:3f93dd1d4cb3	366
sam_grove	5:3f93dd1d4cb3	367	/* If the upper layer can't receive this data, store it */
sam_grove	5:3f93dd1d4cb3	368	if (err != ERR_OK) {
sam_grove	5:3f93dd1d4cb3	369	pcb->refused_data = recv_data;
sam_grove	5:3f93dd1d4cb3	370	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: keep incoming packet, because pcb is \"full\"\n"));
sam_grove	5:3f93dd1d4cb3	371	}
sam_grove	5:3f93dd1d4cb3	372	}
sam_grove	5:3f93dd1d4cb3	373
sam_grove	5:3f93dd1d4cb3	374	/* If a FIN segment was received, we call the callback
sam_grove	5:3f93dd1d4cb3	375	function with a NULL buffer to indicate EOF. */
sam_grove	5:3f93dd1d4cb3	376	if (recv_flags & TF_GOT_FIN) {
sam_grove	5:3f93dd1d4cb3	377	/* correct rcv_wnd as the application won't call tcp_recved()
sam_grove	5:3f93dd1d4cb3	378	for the FIN's seqno */
sam_grove	5:3f93dd1d4cb3	379	if (pcb->rcv_wnd != TCP_WND) {
sam_grove	5:3f93dd1d4cb3	380	pcb->rcv_wnd++;
sam_grove	5:3f93dd1d4cb3	381	}
sam_grove	5:3f93dd1d4cb3	382	TCP_EVENT_CLOSED(pcb, err);
sam_grove	5:3f93dd1d4cb3	383	if (err == ERR_ABRT) {
sam_grove	5:3f93dd1d4cb3	384	goto aborted;
sam_grove	5:3f93dd1d4cb3	385	}
sam_grove	5:3f93dd1d4cb3	386	}
sam_grove	5:3f93dd1d4cb3	387
sam_grove	5:3f93dd1d4cb3	388	tcp_input_pcb = NULL;
sam_grove	5:3f93dd1d4cb3	389	/* Try to send something out. */
sam_grove	5:3f93dd1d4cb3	390	tcp_output(pcb);
sam_grove	5:3f93dd1d4cb3	391	#if TCP_INPUT_DEBUG
sam_grove	5:3f93dd1d4cb3	392	#if TCP_DEBUG
sam_grove	5:3f93dd1d4cb3	393	tcp_debug_print_state(pcb->state);
sam_grove	5:3f93dd1d4cb3	394	#endif /* TCP_DEBUG */
sam_grove	5:3f93dd1d4cb3	395	#endif /* TCP_INPUT_DEBUG */
sam_grove	5:3f93dd1d4cb3	396	}
sam_grove	5:3f93dd1d4cb3	397	}
sam_grove	5:3f93dd1d4cb3	398	/* Jump target if pcb has been aborted in a callback (by calling tcp_abort()).
sam_grove	5:3f93dd1d4cb3	399	Below this line, 'pcb' may not be dereferenced! */
sam_grove	5:3f93dd1d4cb3	400	aborted:
sam_grove	5:3f93dd1d4cb3	401	tcp_input_pcb = NULL;
sam_grove	5:3f93dd1d4cb3	402	recv_data = NULL;
sam_grove	5:3f93dd1d4cb3	403
sam_grove	5:3f93dd1d4cb3	404	/* give up our reference to inseg.p */
sam_grove	5:3f93dd1d4cb3	405	if (inseg.p != NULL)
sam_grove	5:3f93dd1d4cb3	406	{
sam_grove	5:3f93dd1d4cb3	407	pbuf_free(inseg.p);
sam_grove	5:3f93dd1d4cb3	408	inseg.p = NULL;
sam_grove	5:3f93dd1d4cb3	409	}
sam_grove	5:3f93dd1d4cb3	410	} else {
sam_grove	5:3f93dd1d4cb3	411
sam_grove	5:3f93dd1d4cb3	412	/* If no matching PCB was found, send a TCP RST (reset) to the
sam_grove	5:3f93dd1d4cb3	413	sender. */
sam_grove	5:3f93dd1d4cb3	414	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_input: no PCB match found, resetting.\n"));
sam_grove	5:3f93dd1d4cb3	415	if (!(TCPH_FLAGS(tcphdr) & TCP_RST)) {
sam_grove	5:3f93dd1d4cb3	416	TCP_STATS_INC(tcp.proterr);
sam_grove	5:3f93dd1d4cb3	417	TCP_STATS_INC(tcp.drop);
sam_grove	5:3f93dd1d4cb3	418	tcp_rst(ackno, seqno + tcplen,
sam_grove	5:3f93dd1d4cb3	419	ip_current_dest_addr(), ip_current_src_addr(),
sam_grove	5:3f93dd1d4cb3	420	tcphdr->dest, tcphdr->src);
sam_grove	5:3f93dd1d4cb3	421	}
sam_grove	5:3f93dd1d4cb3	422	pbuf_free(p);
sam_grove	5:3f93dd1d4cb3	423	}
sam_grove	5:3f93dd1d4cb3	424
sam_grove	5:3f93dd1d4cb3	425	LWIP_ASSERT("tcp_input: tcp_pcbs_sane()", tcp_pcbs_sane());
sam_grove	5:3f93dd1d4cb3	426	PERF_STOP("tcp_input");
sam_grove	5:3f93dd1d4cb3	427	}
sam_grove	5:3f93dd1d4cb3	428
sam_grove	5:3f93dd1d4cb3	429	/**
sam_grove	5:3f93dd1d4cb3	430	* Called by tcp_input() when a segment arrives for a listening
sam_grove	5:3f93dd1d4cb3	431	* connection (from tcp_input()).
sam_grove	5:3f93dd1d4cb3	432	*
sam_grove	5:3f93dd1d4cb3	433	* @param pcb the tcp_pcb_listen for which a segment arrived
sam_grove	5:3f93dd1d4cb3	434	* @return ERR_OK if the segment was processed
sam_grove	5:3f93dd1d4cb3	435	* another err_t on error
sam_grove	5:3f93dd1d4cb3	436	*
sam_grove	5:3f93dd1d4cb3	437	* @note the return value is not (yet?) used in tcp_input()
sam_grove	5:3f93dd1d4cb3	438	* @note the segment which arrived is saved in global variables, therefore only the pcb
sam_grove	5:3f93dd1d4cb3	439	* involved is passed as a parameter to this function
sam_grove	5:3f93dd1d4cb3	440	*/
sam_grove	5:3f93dd1d4cb3	441	static err_t
sam_grove	5:3f93dd1d4cb3	442	tcp_listen_input(struct tcp_pcb_listen *pcb)
sam_grove	5:3f93dd1d4cb3	443	{
sam_grove	5:3f93dd1d4cb3	444	struct tcp_pcb *npcb;
sam_grove	5:3f93dd1d4cb3	445	err_t rc;
sam_grove	5:3f93dd1d4cb3	446
sam_grove	5:3f93dd1d4cb3	447	/* In the LISTEN state, we check for incoming SYN segments,
sam_grove	5:3f93dd1d4cb3	448	creates a new PCB, and responds with a SYN\|ACK. */
sam_grove	5:3f93dd1d4cb3	449	if (flags & TCP_ACK) {
sam_grove	5:3f93dd1d4cb3	450	/* For incoming segments with the ACK flag set, respond with a
sam_grove	5:3f93dd1d4cb3	451	RST. */
sam_grove	5:3f93dd1d4cb3	452	LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_listen_input: ACK in LISTEN, sending reset\n"));
sam_grove	5:3f93dd1d4cb3	453	tcp_rst(ackno + 1, seqno + tcplen,
sam_grove	5:3f93dd1d4cb3	454	ip_current_dest_addr(), ip_current_src_addr(),
sam_grove	5:3f93dd1d4cb3	455	tcphdr->dest, tcphdr->src);
sam_grove	5:3f93dd1d4cb3	456	} else if (flags & TCP_SYN) {
sam_grove	5:3f93dd1d4cb3	457	LWIP_DEBUGF(TCP_DEBUG, ("TCP connection request %"U16_F" -> %"U16_F".\n", tcphdr->src, tcphdr->dest));
sam_grove	5:3f93dd1d4cb3	458	#if TCP_LISTEN_BACKLOG
sam_grove	5:3f93dd1d4cb3	459	if (pcb->accepts_pending >= pcb->backlog) {
sam_grove	5:3f93dd1d4cb3	460	LWIP_DEBUGF(TCP_DEBUG, ("tcp_listen_input: listen backlog exceeded for port %"U16_F"\n", tcphdr->dest));
sam_grove	5:3f93dd1d4cb3	461	return ERR_ABRT;
sam_grove	5:3f93dd1d4cb3	462	}
sam_grove	5:3f93dd1d4cb3	463	#endif /* TCP_LISTEN_BACKLOG */
sam_grove	5:3f93dd1d4cb3	464	npcb = tcp_alloc(pcb->prio);
sam_grove	5:3f93dd1d4cb3	465	/* If a new PCB could not be created (probably due to lack of memory),
sam_grove	5:3f93dd1d4cb3	466	we don't do anything, but rely on the sender will retransmit the
sam_grove	5:3f93dd1d4cb3	467	SYN at a time when we have more memory available. */
sam_grove	5:3f93dd1d4cb3	468	if (npcb == NULL) {
sam_grove	5:3f93dd1d4cb3	469	LWIP_DEBUGF(TCP_DEBUG, ("tcp_listen_input: could not allocate PCB\n"));
sam_grove	5:3f93dd1d4cb3	470	TCP_STATS_INC(tcp.memerr);
sam_grove	5:3f93dd1d4cb3	471	return ERR_MEM;
sam_grove	5:3f93dd1d4cb3	472	}
sam_grove	5:3f93dd1d4cb3	473	#if TCP_LISTEN_BACKLOG
sam_grove	5:3f93dd1d4cb3	474	pcb->accepts_pending++;
sam_grove	5:3f93dd1d4cb3	475	#endif /* TCP_LISTEN_BACKLOG */
sam_grove	5:3f93dd1d4cb3	476	/* Set up the new PCB. */
sam_grove	5:3f93dd1d4cb3	477	ip_addr_copy(npcb->local_ip, current_iphdr_dest);
sam_grove	5:3f93dd1d4cb3	478	npcb->local_port = pcb->local_port;
sam_grove	5:3f93dd1d4cb3	479	ip_addr_copy(npcb->remote_ip, current_iphdr_src);
sam_grove	5:3f93dd1d4cb3	480	npcb->remote_port = tcphdr->src;
sam_grove	5:3f93dd1d4cb3	481	npcb->state = SYN_RCVD;
sam_grove	5:3f93dd1d4cb3	482	npcb->rcv_nxt = seqno + 1;
sam_grove	5:3f93dd1d4cb3	483	npcb->rcv_ann_right_edge = npcb->rcv_nxt;
sam_grove	5:3f93dd1d4cb3	484	npcb->snd_wnd = tcphdr->wnd;
sam_grove	5:3f93dd1d4cb3	485	npcb->ssthresh = npcb->snd_wnd;
sam_grove	5:3f93dd1d4cb3	486	npcb->snd_wl1 = seqno - 1;/* initialise to seqno-1 to force window update */
sam_grove	5:3f93dd1d4cb3	487	npcb->callback_arg = pcb->callback_arg;
sam_grove	5:3f93dd1d4cb3	488	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	489	npcb->accept = pcb->accept;
sam_grove	5:3f93dd1d4cb3	490	#endif /* LWIP_CALLBACK_API */
sam_grove	5:3f93dd1d4cb3	491	/* inherit socket options */
sam_grove	5:3f93dd1d4cb3	492	npcb->so_options = pcb->so_options & SOF_INHERITED;
sam_grove	5:3f93dd1d4cb3	493	/* Register the new PCB so that we can begin receiving segments
sam_grove	5:3f93dd1d4cb3	494	for it. */
sam_grove	5:3f93dd1d4cb3	495	TCP_REG(&tcp_active_pcbs, npcb);
sam_grove	5:3f93dd1d4cb3	496
sam_grove	5:3f93dd1d4cb3	497	/* Parse any options in the SYN. */
sam_grove	5:3f93dd1d4cb3	498	tcp_parseopt(npcb);
sam_grove	5:3f93dd1d4cb3	499	#if TCP_CALCULATE_EFF_SEND_MSS
sam_grove	5:3f93dd1d4cb3	500	npcb->mss = tcp_eff_send_mss(npcb->mss, &(npcb->remote_ip));
sam_grove	5:3f93dd1d4cb3	501	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
sam_grove	5:3f93dd1d4cb3	502
sam_grove	5:3f93dd1d4cb3	503	snmp_inc_tcppassiveopens();
sam_grove	5:3f93dd1d4cb3	504
sam_grove	5:3f93dd1d4cb3	505	/* Send a SYN\|ACK together with the MSS option. */
sam_grove	5:3f93dd1d4cb3	506	rc = tcp_enqueue_flags(npcb, TCP_SYN \| TCP_ACK);
sam_grove	5:3f93dd1d4cb3	507	if (rc != ERR_OK) {
sam_grove	5:3f93dd1d4cb3	508	tcp_abandon(npcb, 0);
sam_grove	5:3f93dd1d4cb3	509	return rc;
sam_grove	5:3f93dd1d4cb3	510	}
sam_grove	5:3f93dd1d4cb3	511	return tcp_output(npcb);
sam_grove	5:3f93dd1d4cb3	512	}
sam_grove	5:3f93dd1d4cb3	513	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	514	}
sam_grove	5:3f93dd1d4cb3	515
sam_grove	5:3f93dd1d4cb3	516	/**
sam_grove	5:3f93dd1d4cb3	517	* Called by tcp_input() when a segment arrives for a connection in
sam_grove	5:3f93dd1d4cb3	518	* TIME_WAIT.
sam_grove	5:3f93dd1d4cb3	519	*
sam_grove	5:3f93dd1d4cb3	520	* @param pcb the tcp_pcb for which a segment arrived
sam_grove	5:3f93dd1d4cb3	521	*
sam_grove	5:3f93dd1d4cb3	522	* @note the segment which arrived is saved in global variables, therefore only the pcb
sam_grove	5:3f93dd1d4cb3	523	* involved is passed as a parameter to this function
sam_grove	5:3f93dd1d4cb3	524	*/
sam_grove	5:3f93dd1d4cb3	525	static err_t
sam_grove	5:3f93dd1d4cb3	526	tcp_timewait_input(struct tcp_pcb *pcb)
sam_grove	5:3f93dd1d4cb3	527	{
sam_grove	5:3f93dd1d4cb3	528	/* RFC 1337: in TIME_WAIT, ignore RST and ACK FINs + any 'acceptable' segments */
sam_grove	5:3f93dd1d4cb3	529	/* RFC 793 3.9 Event Processing - Segment Arrives:
sam_grove	5:3f93dd1d4cb3	530	* - first check sequence number - we skip that one in TIME_WAIT (always
sam_grove	5:3f93dd1d4cb3	531	* acceptable since we only send ACKs)
sam_grove	5:3f93dd1d4cb3	532	* - second check the RST bit (... return) */
sam_grove	5:3f93dd1d4cb3	533	if (flags & TCP_RST) {
sam_grove	5:3f93dd1d4cb3	534	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	535	}
sam_grove	5:3f93dd1d4cb3	536	/* - fourth, check the SYN bit, */
sam_grove	5:3f93dd1d4cb3	537	if (flags & TCP_SYN) {
sam_grove	5:3f93dd1d4cb3	538	/* If an incoming segment is not acceptable, an acknowledgment
sam_grove	5:3f93dd1d4cb3	539	should be sent in reply */
sam_grove	5:3f93dd1d4cb3	540	if (TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt, pcb->rcv_nxt+pcb->rcv_wnd)) {
sam_grove	5:3f93dd1d4cb3	541	/* If the SYN is in the window it is an error, send a reset */
sam_grove	5:3f93dd1d4cb3	542	tcp_rst(ackno, seqno + tcplen, ip_current_dest_addr(), ip_current_src_addr(),
sam_grove	5:3f93dd1d4cb3	543	tcphdr->dest, tcphdr->src);
sam_grove	5:3f93dd1d4cb3	544	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	545	}
sam_grove	5:3f93dd1d4cb3	546	} else if (flags & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	547	/* - eighth, check the FIN bit: Remain in the TIME-WAIT state.
sam_grove	5:3f93dd1d4cb3	548	Restart the 2 MSL time-wait timeout.*/
sam_grove	5:3f93dd1d4cb3	549	pcb->tmr = tcp_ticks;
sam_grove	5:3f93dd1d4cb3	550	}
sam_grove	5:3f93dd1d4cb3	551
sam_grove	5:3f93dd1d4cb3	552	if ((tcplen > 0)) {
sam_grove	5:3f93dd1d4cb3	553	/* Acknowledge data, FIN or out-of-window SYN */
sam_grove	5:3f93dd1d4cb3	554	pcb->flags \|= TF_ACK_NOW;
sam_grove	5:3f93dd1d4cb3	555	return tcp_output(pcb);
sam_grove	5:3f93dd1d4cb3	556	}
sam_grove	5:3f93dd1d4cb3	557	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	558	}
sam_grove	5:3f93dd1d4cb3	559
sam_grove	5:3f93dd1d4cb3	560	/**
sam_grove	5:3f93dd1d4cb3	561	* Implements the TCP state machine. Called by tcp_input. In some
sam_grove	5:3f93dd1d4cb3	562	* states tcp_receive() is called to receive data. The tcp_seg
sam_grove	5:3f93dd1d4cb3	563	* argument will be freed by the caller (tcp_input()) unless the
sam_grove	5:3f93dd1d4cb3	564	* recv_data pointer in the pcb is set.
sam_grove	5:3f93dd1d4cb3	565	*
sam_grove	5:3f93dd1d4cb3	566	* @param pcb the tcp_pcb for which a segment arrived
sam_grove	5:3f93dd1d4cb3	567	*
sam_grove	5:3f93dd1d4cb3	568	* @note the segment which arrived is saved in global variables, therefore only the pcb
sam_grove	5:3f93dd1d4cb3	569	* involved is passed as a parameter to this function
sam_grove	5:3f93dd1d4cb3	570	*/
sam_grove	5:3f93dd1d4cb3	571	static err_t
sam_grove	5:3f93dd1d4cb3	572	tcp_process(struct tcp_pcb *pcb)
sam_grove	5:3f93dd1d4cb3	573	{
sam_grove	5:3f93dd1d4cb3	574	struct tcp_seg *rseg;
sam_grove	5:3f93dd1d4cb3	575	u8_t acceptable = 0;
sam_grove	5:3f93dd1d4cb3	576	err_t err;
sam_grove	5:3f93dd1d4cb3	577
sam_grove	5:3f93dd1d4cb3	578	err = ERR_OK;
sam_grove	5:3f93dd1d4cb3	579
sam_grove	5:3f93dd1d4cb3	580	/* Process incoming RST segments. */
sam_grove	5:3f93dd1d4cb3	581	if (flags & TCP_RST) {
sam_grove	5:3f93dd1d4cb3	582	/* First, determine if the reset is acceptable. */
sam_grove	5:3f93dd1d4cb3	583	if (pcb->state == SYN_SENT) {
sam_grove	5:3f93dd1d4cb3	584	if (ackno == pcb->snd_nxt) {
sam_grove	5:3f93dd1d4cb3	585	acceptable = 1;
sam_grove	5:3f93dd1d4cb3	586	}
sam_grove	5:3f93dd1d4cb3	587	} else {
sam_grove	5:3f93dd1d4cb3	588	if (TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt,
sam_grove	5:3f93dd1d4cb3	589	pcb->rcv_nxt+pcb->rcv_wnd)) {
sam_grove	5:3f93dd1d4cb3	590	acceptable = 1;
sam_grove	5:3f93dd1d4cb3	591	}
sam_grove	5:3f93dd1d4cb3	592	}
sam_grove	5:3f93dd1d4cb3	593
sam_grove	5:3f93dd1d4cb3	594	if (acceptable) {
sam_grove	5:3f93dd1d4cb3	595	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_process: Connection RESET\n"));
sam_grove	5:3f93dd1d4cb3	596	LWIP_ASSERT("tcp_input: pcb->state != CLOSED", pcb->state != CLOSED);
sam_grove	5:3f93dd1d4cb3	597	recv_flags \|= TF_RESET;
sam_grove	5:3f93dd1d4cb3	598	pcb->flags &= ~TF_ACK_DELAY;
sam_grove	5:3f93dd1d4cb3	599	return ERR_RST;
sam_grove	5:3f93dd1d4cb3	600	} else {
sam_grove	5:3f93dd1d4cb3	601	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_process: unacceptable reset seqno %"U32_F" rcv_nxt %"U32_F"\n",
sam_grove	5:3f93dd1d4cb3	602	seqno, pcb->rcv_nxt));
sam_grove	5:3f93dd1d4cb3	603	LWIP_DEBUGF(TCP_DEBUG, ("tcp_process: unacceptable reset seqno %"U32_F" rcv_nxt %"U32_F"\n",
sam_grove	5:3f93dd1d4cb3	604	seqno, pcb->rcv_nxt));
sam_grove	5:3f93dd1d4cb3	605	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	606	}
sam_grove	5:3f93dd1d4cb3	607	}
sam_grove	5:3f93dd1d4cb3	608
sam_grove	5:3f93dd1d4cb3	609	if ((flags & TCP_SYN) && (pcb->state != SYN_SENT && pcb->state != SYN_RCVD)) {
sam_grove	5:3f93dd1d4cb3	610	/* Cope with new connection attempt after remote end crashed */
sam_grove	5:3f93dd1d4cb3	611	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	612	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	613	}
sam_grove	5:3f93dd1d4cb3	614
sam_grove	5:3f93dd1d4cb3	615	if ((pcb->flags & TF_RXCLOSED) == 0) {
sam_grove	5:3f93dd1d4cb3	616	/* Update the PCB (in)activity timer unless rx is closed (see tcp_shutdown) */
sam_grove	5:3f93dd1d4cb3	617	pcb->tmr = tcp_ticks;
sam_grove	5:3f93dd1d4cb3	618	}
sam_grove	5:3f93dd1d4cb3	619	pcb->keep_cnt_sent = 0;
sam_grove	5:3f93dd1d4cb3	620
sam_grove	5:3f93dd1d4cb3	621	tcp_parseopt(pcb);
sam_grove	5:3f93dd1d4cb3	622
sam_grove	5:3f93dd1d4cb3	623	/* Do different things depending on the TCP state. */
sam_grove	5:3f93dd1d4cb3	624	switch (pcb->state) {
sam_grove	5:3f93dd1d4cb3	625	case SYN_SENT:
sam_grove	5:3f93dd1d4cb3	626	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("SYN-SENT: ackno %"U32_F" pcb->snd_nxt %"U32_F" unacked %"U32_F"\n", ackno,
sam_grove	5:3f93dd1d4cb3	627	pcb->snd_nxt, ntohl(pcb->unacked->tcphdr->seqno)));
sam_grove	5:3f93dd1d4cb3	628	/* received SYN ACK with expected sequence number? */
sam_grove	5:3f93dd1d4cb3	629	if ((flags & TCP_ACK) && (flags & TCP_SYN)
sam_grove	5:3f93dd1d4cb3	630	&& ackno == ntohl(pcb->unacked->tcphdr->seqno) + 1) {
sam_grove	5:3f93dd1d4cb3	631	pcb->snd_buf++;
sam_grove	5:3f93dd1d4cb3	632	pcb->rcv_nxt = seqno + 1;
sam_grove	5:3f93dd1d4cb3	633	pcb->rcv_ann_right_edge = pcb->rcv_nxt;
sam_grove	5:3f93dd1d4cb3	634	pcb->lastack = ackno;
sam_grove	5:3f93dd1d4cb3	635	pcb->snd_wnd = tcphdr->wnd;
sam_grove	5:3f93dd1d4cb3	636	pcb->snd_wl1 = seqno - 1; /* initialise to seqno - 1 to force window update */
sam_grove	5:3f93dd1d4cb3	637	pcb->state = ESTABLISHED;
sam_grove	5:3f93dd1d4cb3	638
sam_grove	5:3f93dd1d4cb3	639	#if TCP_CALCULATE_EFF_SEND_MSS
sam_grove	5:3f93dd1d4cb3	640	pcb->mss = tcp_eff_send_mss(pcb->mss, &(pcb->remote_ip));
sam_grove	5:3f93dd1d4cb3	641	#endif /* TCP_CALCULATE_EFF_SEND_MSS */
sam_grove	5:3f93dd1d4cb3	642
sam_grove	5:3f93dd1d4cb3	643	/* Set ssthresh again after changing pcb->mss (already set in tcp_connect
sam_grove	5:3f93dd1d4cb3	644	* but for the default value of pcb->mss) */
sam_grove	5:3f93dd1d4cb3	645	pcb->ssthresh = pcb->mss * 10;
sam_grove	5:3f93dd1d4cb3	646
sam_grove	5:3f93dd1d4cb3	647	pcb->cwnd = ((pcb->cwnd == 1) ? (pcb->mss * 2) : pcb->mss);
sam_grove	5:3f93dd1d4cb3	648	LWIP_ASSERT("pcb->snd_queuelen > 0", (pcb->snd_queuelen > 0));
sam_grove	5:3f93dd1d4cb3	649	--pcb->snd_queuelen;
sam_grove	5:3f93dd1d4cb3	650	LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_process: SYN-SENT --queuelen %"U16_F"\n", (u16_t)pcb->snd_queuelen));
sam_grove	5:3f93dd1d4cb3	651	rseg = pcb->unacked;
sam_grove	5:3f93dd1d4cb3	652	pcb->unacked = rseg->next;
sam_grove	5:3f93dd1d4cb3	653
sam_grove	5:3f93dd1d4cb3	654	/* If there's nothing left to acknowledge, stop the retransmit
sam_grove	5:3f93dd1d4cb3	655	timer, otherwise reset it to start again */
sam_grove	5:3f93dd1d4cb3	656	if(pcb->unacked == NULL)
sam_grove	5:3f93dd1d4cb3	657	pcb->rtime = -1;
sam_grove	5:3f93dd1d4cb3	658	else {
sam_grove	5:3f93dd1d4cb3	659	pcb->rtime = 0;
sam_grove	5:3f93dd1d4cb3	660	pcb->nrtx = 0;
sam_grove	5:3f93dd1d4cb3	661	}
sam_grove	5:3f93dd1d4cb3	662
sam_grove	5:3f93dd1d4cb3	663	tcp_seg_free(rseg);
sam_grove	5:3f93dd1d4cb3	664
sam_grove	5:3f93dd1d4cb3	665	/* Call the user specified function to call when sucessfully
sam_grove	5:3f93dd1d4cb3	666	* connected. */
sam_grove	5:3f93dd1d4cb3	667	TCP_EVENT_CONNECTED(pcb, ERR_OK, err);
sam_grove	5:3f93dd1d4cb3	668	if (err == ERR_ABRT) {
sam_grove	5:3f93dd1d4cb3	669	return ERR_ABRT;
sam_grove	5:3f93dd1d4cb3	670	}
sam_grove	5:3f93dd1d4cb3	671	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	672	}
sam_grove	5:3f93dd1d4cb3	673	/* received ACK? possibly a half-open connection */
sam_grove	5:3f93dd1d4cb3	674	else if (flags & TCP_ACK) {
sam_grove	5:3f93dd1d4cb3	675	/* send a RST to bring the other side in a non-synchronized state. */
sam_grove	5:3f93dd1d4cb3	676	tcp_rst(ackno, seqno + tcplen, ip_current_dest_addr(), ip_current_src_addr(),
sam_grove	5:3f93dd1d4cb3	677	tcphdr->dest, tcphdr->src);
sam_grove	5:3f93dd1d4cb3	678	}
sam_grove	5:3f93dd1d4cb3	679	break;
sam_grove	5:3f93dd1d4cb3	680	case SYN_RCVD:
sam_grove	5:3f93dd1d4cb3	681	if (flags & TCP_ACK) {
sam_grove	5:3f93dd1d4cb3	682	/* expected ACK number? */
sam_grove	5:3f93dd1d4cb3	683	if (TCP_SEQ_BETWEEN(ackno, pcb->lastack+1, pcb->snd_nxt)) {
sam_grove	5:3f93dd1d4cb3	684	u16_t old_cwnd;
sam_grove	5:3f93dd1d4cb3	685	pcb->state = ESTABLISHED;
sam_grove	5:3f93dd1d4cb3	686	LWIP_DEBUGF(TCP_DEBUG, ("TCP connection established %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
sam_grove	5:3f93dd1d4cb3	687	#if LWIP_CALLBACK_API
sam_grove	5:3f93dd1d4cb3	688	LWIP_ASSERT("pcb->accept != NULL", pcb->accept != NULL);
sam_grove	5:3f93dd1d4cb3	689	#endif
sam_grove	5:3f93dd1d4cb3	690	/* Call the accept function. */
sam_grove	5:3f93dd1d4cb3	691	TCP_EVENT_ACCEPT(pcb, ERR_OK, err);
sam_grove	5:3f93dd1d4cb3	692	if (err != ERR_OK) {
sam_grove	5:3f93dd1d4cb3	693	/* If the accept function returns with an error, we abort
sam_grove	5:3f93dd1d4cb3	694	* the connection. */
sam_grove	5:3f93dd1d4cb3	695	/* Already aborted? */
sam_grove	5:3f93dd1d4cb3	696	if (err != ERR_ABRT) {
sam_grove	5:3f93dd1d4cb3	697	tcp_abort(pcb);
sam_grove	5:3f93dd1d4cb3	698	}
sam_grove	5:3f93dd1d4cb3	699	return ERR_ABRT;
sam_grove	5:3f93dd1d4cb3	700	}
sam_grove	5:3f93dd1d4cb3	701	old_cwnd = pcb->cwnd;
sam_grove	5:3f93dd1d4cb3	702	/* If there was any data contained within this ACK,
sam_grove	5:3f93dd1d4cb3	703	* we'd better pass it on to the application as well. */
sam_grove	5:3f93dd1d4cb3	704	tcp_receive(pcb);
sam_grove	5:3f93dd1d4cb3	705
sam_grove	5:3f93dd1d4cb3	706	/* Prevent ACK for SYN to generate a sent event */
sam_grove	5:3f93dd1d4cb3	707	if (pcb->acked != 0) {
sam_grove	5:3f93dd1d4cb3	708	pcb->acked--;
sam_grove	5:3f93dd1d4cb3	709	}
sam_grove	5:3f93dd1d4cb3	710
sam_grove	5:3f93dd1d4cb3	711	pcb->cwnd = ((old_cwnd == 1) ? (pcb->mss * 2) : pcb->mss);
sam_grove	5:3f93dd1d4cb3	712
sam_grove	5:3f93dd1d4cb3	713	if (recv_flags & TF_GOT_FIN) {
sam_grove	5:3f93dd1d4cb3	714	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	715	pcb->state = CLOSE_WAIT;
sam_grove	5:3f93dd1d4cb3	716	}
sam_grove	5:3f93dd1d4cb3	717	} else {
sam_grove	5:3f93dd1d4cb3	718	/* incorrect ACK number, send RST */
sam_grove	5:3f93dd1d4cb3	719	tcp_rst(ackno, seqno + tcplen, ip_current_dest_addr(), ip_current_src_addr(),
sam_grove	5:3f93dd1d4cb3	720	tcphdr->dest, tcphdr->src);
sam_grove	5:3f93dd1d4cb3	721	}
sam_grove	5:3f93dd1d4cb3	722	} else if ((flags & TCP_SYN) && (seqno == pcb->rcv_nxt - 1)) {
sam_grove	5:3f93dd1d4cb3	723	/* Looks like another copy of the SYN - retransmit our SYN-ACK */
sam_grove	5:3f93dd1d4cb3	724	tcp_rexmit(pcb);
sam_grove	5:3f93dd1d4cb3	725	}
sam_grove	5:3f93dd1d4cb3	726	break;
sam_grove	5:3f93dd1d4cb3	727	case CLOSE_WAIT:
sam_grove	5:3f93dd1d4cb3	728	/* FALLTHROUGH */
sam_grove	5:3f93dd1d4cb3	729	case ESTABLISHED:
sam_grove	5:3f93dd1d4cb3	730	tcp_receive(pcb);
sam_grove	5:3f93dd1d4cb3	731	if (recv_flags & TF_GOT_FIN) { /* passive close */
sam_grove	5:3f93dd1d4cb3	732	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	733	pcb->state = CLOSE_WAIT;
sam_grove	5:3f93dd1d4cb3	734	}
sam_grove	5:3f93dd1d4cb3	735	break;
sam_grove	5:3f93dd1d4cb3	736	case FIN_WAIT_1:
sam_grove	5:3f93dd1d4cb3	737	tcp_receive(pcb);
sam_grove	5:3f93dd1d4cb3	738	if (recv_flags & TF_GOT_FIN) {
sam_grove	5:3f93dd1d4cb3	739	if ((flags & TCP_ACK) && (ackno == pcb->snd_nxt)) {
sam_grove	5:3f93dd1d4cb3	740	LWIP_DEBUGF(TCP_DEBUG,
sam_grove	5:3f93dd1d4cb3	741	("TCP connection closed: FIN_WAIT_1 %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
sam_grove	5:3f93dd1d4cb3	742	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	743	tcp_pcb_purge(pcb);
sam_grove	5:3f93dd1d4cb3	744	TCP_RMV(&tcp_active_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	745	pcb->state = TIME_WAIT;
sam_grove	5:3f93dd1d4cb3	746	TCP_REG(&tcp_tw_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	747	} else {
sam_grove	5:3f93dd1d4cb3	748	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	749	pcb->state = CLOSING;
sam_grove	5:3f93dd1d4cb3	750	}
sam_grove	5:3f93dd1d4cb3	751	} else if ((flags & TCP_ACK) && (ackno == pcb->snd_nxt)) {
sam_grove	5:3f93dd1d4cb3	752	pcb->state = FIN_WAIT_2;
sam_grove	5:3f93dd1d4cb3	753	}
sam_grove	5:3f93dd1d4cb3	754	break;
sam_grove	5:3f93dd1d4cb3	755	case FIN_WAIT_2:
sam_grove	5:3f93dd1d4cb3	756	tcp_receive(pcb);
sam_grove	5:3f93dd1d4cb3	757	if (recv_flags & TF_GOT_FIN) {
sam_grove	5:3f93dd1d4cb3	758	LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed: FIN_WAIT_2 %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
sam_grove	5:3f93dd1d4cb3	759	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	760	tcp_pcb_purge(pcb);
sam_grove	5:3f93dd1d4cb3	761	TCP_RMV(&tcp_active_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	762	pcb->state = TIME_WAIT;
sam_grove	5:3f93dd1d4cb3	763	TCP_REG(&tcp_tw_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	764	}
sam_grove	5:3f93dd1d4cb3	765	break;
sam_grove	5:3f93dd1d4cb3	766	case CLOSING:
sam_grove	5:3f93dd1d4cb3	767	tcp_receive(pcb);
sam_grove	5:3f93dd1d4cb3	768	if (flags & TCP_ACK && ackno == pcb->snd_nxt) {
sam_grove	5:3f93dd1d4cb3	769	LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed: CLOSING %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
sam_grove	5:3f93dd1d4cb3	770	tcp_pcb_purge(pcb);
sam_grove	5:3f93dd1d4cb3	771	TCP_RMV(&tcp_active_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	772	pcb->state = TIME_WAIT;
sam_grove	5:3f93dd1d4cb3	773	TCP_REG(&tcp_tw_pcbs, pcb);
sam_grove	5:3f93dd1d4cb3	774	}
sam_grove	5:3f93dd1d4cb3	775	break;
sam_grove	5:3f93dd1d4cb3	776	case LAST_ACK:
sam_grove	5:3f93dd1d4cb3	777	tcp_receive(pcb);
sam_grove	5:3f93dd1d4cb3	778	if (flags & TCP_ACK && ackno == pcb->snd_nxt) {
sam_grove	5:3f93dd1d4cb3	779	LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed: LAST_ACK %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
sam_grove	5:3f93dd1d4cb3	780	/* bugfix #21699: don't set pcb->state to CLOSED here or we risk leaking segments */
sam_grove	5:3f93dd1d4cb3	781	recv_flags \|= TF_CLOSED;
sam_grove	5:3f93dd1d4cb3	782	}
sam_grove	5:3f93dd1d4cb3	783	break;
sam_grove	5:3f93dd1d4cb3	784	default:
sam_grove	5:3f93dd1d4cb3	785	break;
sam_grove	5:3f93dd1d4cb3	786	}
sam_grove	5:3f93dd1d4cb3	787	return ERR_OK;
sam_grove	5:3f93dd1d4cb3	788	}
sam_grove	5:3f93dd1d4cb3	789
sam_grove	5:3f93dd1d4cb3	790	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	791	/**
sam_grove	5:3f93dd1d4cb3	792	* Insert segment into the list (segments covered with new one will be deleted)
sam_grove	5:3f93dd1d4cb3	793	*
sam_grove	5:3f93dd1d4cb3	794	* Called from tcp_receive()
sam_grove	5:3f93dd1d4cb3	795	*/
sam_grove	5:3f93dd1d4cb3	796	static void
sam_grove	5:3f93dd1d4cb3	797	tcp_oos_insert_segment(struct tcp_seg cseg, struct tcp_seg next)
sam_grove	5:3f93dd1d4cb3	798	{
sam_grove	5:3f93dd1d4cb3	799	struct tcp_seg *old_seg;
sam_grove	5:3f93dd1d4cb3	800
sam_grove	5:3f93dd1d4cb3	801	if (TCPH_FLAGS(cseg->tcphdr) & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	802	/* received segment overlaps all following segments */
sam_grove	5:3f93dd1d4cb3	803	tcp_segs_free(next);
sam_grove	5:3f93dd1d4cb3	804	next = NULL;
sam_grove	5:3f93dd1d4cb3	805	}
sam_grove	5:3f93dd1d4cb3	806	else {
sam_grove	5:3f93dd1d4cb3	807	/* delete some following segments
sam_grove	5:3f93dd1d4cb3	808	oos queue may have segments with FIN flag */
sam_grove	5:3f93dd1d4cb3	809	while (next &&
sam_grove	5:3f93dd1d4cb3	810	TCP_SEQ_GEQ((seqno + cseg->len),
sam_grove	5:3f93dd1d4cb3	811	(next->tcphdr->seqno + next->len))) {
sam_grove	5:3f93dd1d4cb3	812	/* cseg with FIN already processed */
sam_grove	5:3f93dd1d4cb3	813	if (TCPH_FLAGS(next->tcphdr) & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	814	TCPH_SET_FLAG(cseg->tcphdr, TCP_FIN);
sam_grove	5:3f93dd1d4cb3	815	}
sam_grove	5:3f93dd1d4cb3	816	old_seg = next;
sam_grove	5:3f93dd1d4cb3	817	next = next->next;
sam_grove	5:3f93dd1d4cb3	818	tcp_seg_free(old_seg);
sam_grove	5:3f93dd1d4cb3	819	}
sam_grove	5:3f93dd1d4cb3	820	if (next &&
sam_grove	5:3f93dd1d4cb3	821	TCP_SEQ_GT(seqno + cseg->len, next->tcphdr->seqno)) {
sam_grove	5:3f93dd1d4cb3	822	/* We need to trim the incoming segment. */
sam_grove	5:3f93dd1d4cb3	823	cseg->len = (u16_t)(next->tcphdr->seqno - seqno);
sam_grove	5:3f93dd1d4cb3	824	pbuf_realloc(cseg->p, cseg->len);
sam_grove	5:3f93dd1d4cb3	825	}
sam_grove	5:3f93dd1d4cb3	826	}
sam_grove	5:3f93dd1d4cb3	827	cseg->next = next;
sam_grove	5:3f93dd1d4cb3	828	}
sam_grove	5:3f93dd1d4cb3	829	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	830
sam_grove	5:3f93dd1d4cb3	831	/**
sam_grove	5:3f93dd1d4cb3	832	* Called by tcp_process. Checks if the given segment is an ACK for outstanding
sam_grove	5:3f93dd1d4cb3	833	* data, and if so frees the memory of the buffered data. Next, is places the
sam_grove	5:3f93dd1d4cb3	834	* segment on any of the receive queues (pcb->recved or pcb->ooseq). If the segment
sam_grove	5:3f93dd1d4cb3	835	* is buffered, the pbuf is referenced by pbuf_ref so that it will not be freed until
sam_grove	5:3f93dd1d4cb3	836	* i it has been removed from the buffer.
sam_grove	5:3f93dd1d4cb3	837	*
sam_grove	5:3f93dd1d4cb3	838	* If the incoming segment constitutes an ACK for a segment that was used for RTT
sam_grove	5:3f93dd1d4cb3	839	* estimation, the RTT is estimated here as well.
sam_grove	5:3f93dd1d4cb3	840	*
sam_grove	5:3f93dd1d4cb3	841	* Called from tcp_process().
sam_grove	5:3f93dd1d4cb3	842	*/
sam_grove	5:3f93dd1d4cb3	843	static void
sam_grove	5:3f93dd1d4cb3	844	tcp_receive(struct tcp_pcb *pcb)
sam_grove	5:3f93dd1d4cb3	845	{
sam_grove	5:3f93dd1d4cb3	846	struct tcp_seg *next;
sam_grove	5:3f93dd1d4cb3	847	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	848	struct tcp_seg prev, cseg;
sam_grove	5:3f93dd1d4cb3	849	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	850	struct pbuf *p;
sam_grove	5:3f93dd1d4cb3	851	s32_t off;
sam_grove	5:3f93dd1d4cb3	852	s16_t m;
sam_grove	5:3f93dd1d4cb3	853	u32_t right_wnd_edge;
sam_grove	5:3f93dd1d4cb3	854	u16_t new_tot_len;
sam_grove	5:3f93dd1d4cb3	855	int found_dupack = 0;
sam_grove	5:3f93dd1d4cb3	856
sam_grove	5:3f93dd1d4cb3	857	if (flags & TCP_ACK) {
sam_grove	5:3f93dd1d4cb3	858	right_wnd_edge = pcb->snd_wnd + pcb->snd_wl2;
sam_grove	5:3f93dd1d4cb3	859
sam_grove	5:3f93dd1d4cb3	860	/* Update window. */
sam_grove	5:3f93dd1d4cb3	861	if (TCP_SEQ_LT(pcb->snd_wl1, seqno) \|\|
sam_grove	5:3f93dd1d4cb3	862	(pcb->snd_wl1 == seqno && TCP_SEQ_LT(pcb->snd_wl2, ackno)) \|\|
sam_grove	5:3f93dd1d4cb3	863	(pcb->snd_wl2 == ackno && tcphdr->wnd > pcb->snd_wnd)) {
sam_grove	5:3f93dd1d4cb3	864	pcb->snd_wnd = tcphdr->wnd;
sam_grove	5:3f93dd1d4cb3	865	pcb->snd_wl1 = seqno;
sam_grove	5:3f93dd1d4cb3	866	pcb->snd_wl2 = ackno;
sam_grove	5:3f93dd1d4cb3	867	if (pcb->snd_wnd > 0 && pcb->persist_backoff > 0) {
sam_grove	5:3f93dd1d4cb3	868	pcb->persist_backoff = 0;
sam_grove	5:3f93dd1d4cb3	869	}
sam_grove	5:3f93dd1d4cb3	870	LWIP_DEBUGF(TCP_WND_DEBUG, ("tcp_receive: window update %"U16_F"\n", pcb->snd_wnd));
sam_grove	5:3f93dd1d4cb3	871	#if TCP_WND_DEBUG
sam_grove	5:3f93dd1d4cb3	872	} else {
sam_grove	5:3f93dd1d4cb3	873	if (pcb->snd_wnd != tcphdr->wnd) {
sam_grove	5:3f93dd1d4cb3	874	LWIP_DEBUGF(TCP_WND_DEBUG,
sam_grove	5:3f93dd1d4cb3	875	("tcp_receive: no window update lastack %"U32_F" ackno %"
sam_grove	5:3f93dd1d4cb3	876	U32_F" wl1 %"U32_F" seqno %"U32_F" wl2 %"U32_F"\n",
sam_grove	5:3f93dd1d4cb3	877	pcb->lastack, ackno, pcb->snd_wl1, seqno, pcb->snd_wl2));
sam_grove	5:3f93dd1d4cb3	878	}
sam_grove	5:3f93dd1d4cb3	879	#endif /* TCP_WND_DEBUG */
sam_grove	5:3f93dd1d4cb3	880	}
sam_grove	5:3f93dd1d4cb3	881
sam_grove	5:3f93dd1d4cb3	882	/* (From Stevens TCP/IP Illustrated Vol II, p970.) Its only a
sam_grove	5:3f93dd1d4cb3	883	* duplicate ack if:
sam_grove	5:3f93dd1d4cb3	884	* 1) It doesn't ACK new data
sam_grove	5:3f93dd1d4cb3	885	* 2) length of received packet is zero (i.e. no payload)
sam_grove	5:3f93dd1d4cb3	886	* 3) the advertised window hasn't changed
sam_grove	5:3f93dd1d4cb3	887	* 4) There is outstanding unacknowledged data (retransmission timer running)
sam_grove	5:3f93dd1d4cb3	888	* 5) The ACK is == biggest ACK sequence number so far seen (snd_una)
sam_grove	5:3f93dd1d4cb3	889	*
sam_grove	5:3f93dd1d4cb3	890	* If it passes all five, should process as a dupack:
sam_grove	5:3f93dd1d4cb3	891	* a) dupacks < 3: do nothing
sam_grove	5:3f93dd1d4cb3	892	* b) dupacks == 3: fast retransmit
sam_grove	5:3f93dd1d4cb3	893	* c) dupacks > 3: increase cwnd
sam_grove	5:3f93dd1d4cb3	894	*
sam_grove	5:3f93dd1d4cb3	895	* If it only passes 1-3, should reset dupack counter (and add to
sam_grove	5:3f93dd1d4cb3	896	* stats, which we don't do in lwIP)
sam_grove	5:3f93dd1d4cb3	897	*
sam_grove	5:3f93dd1d4cb3	898	* If it only passes 1, should reset dupack counter
sam_grove	5:3f93dd1d4cb3	899	*
sam_grove	5:3f93dd1d4cb3	900	*/
sam_grove	5:3f93dd1d4cb3	901
sam_grove	5:3f93dd1d4cb3	902	/* Clause 1 */
sam_grove	5:3f93dd1d4cb3	903	if (TCP_SEQ_LEQ(ackno, pcb->lastack)) {
sam_grove	5:3f93dd1d4cb3	904	pcb->acked = 0;
sam_grove	5:3f93dd1d4cb3	905	/* Clause 2 */
sam_grove	5:3f93dd1d4cb3	906	if (tcplen == 0) {
sam_grove	5:3f93dd1d4cb3	907	/* Clause 3 */
sam_grove	5:3f93dd1d4cb3	908	if (pcb->snd_wl2 + pcb->snd_wnd == right_wnd_edge){
sam_grove	5:3f93dd1d4cb3	909	/* Clause 4 */
sam_grove	5:3f93dd1d4cb3	910	if (pcb->rtime >= 0) {
sam_grove	5:3f93dd1d4cb3	911	/* Clause 5 */
sam_grove	5:3f93dd1d4cb3	912	if (pcb->lastack == ackno) {
sam_grove	5:3f93dd1d4cb3	913	found_dupack = 1;
sam_grove	5:3f93dd1d4cb3	914	if (pcb->dupacks + 1 > pcb->dupacks)
sam_grove	5:3f93dd1d4cb3	915	++pcb->dupacks;
sam_grove	5:3f93dd1d4cb3	916	if (pcb->dupacks > 3) {
sam_grove	5:3f93dd1d4cb3	917	/* Inflate the congestion window, but not if it means that
sam_grove	5:3f93dd1d4cb3	918	the value overflows. */
sam_grove	5:3f93dd1d4cb3	919	if ((u16_t)(pcb->cwnd + pcb->mss) > pcb->cwnd) {
sam_grove	5:3f93dd1d4cb3	920	pcb->cwnd += pcb->mss;
sam_grove	5:3f93dd1d4cb3	921	}
sam_grove	5:3f93dd1d4cb3	922	} else if (pcb->dupacks == 3) {
sam_grove	5:3f93dd1d4cb3	923	/* Do fast retransmit */
sam_grove	5:3f93dd1d4cb3	924	tcp_rexmit_fast(pcb);
sam_grove	5:3f93dd1d4cb3	925	}
sam_grove	5:3f93dd1d4cb3	926	}
sam_grove	5:3f93dd1d4cb3	927	}
sam_grove	5:3f93dd1d4cb3	928	}
sam_grove	5:3f93dd1d4cb3	929	}
sam_grove	5:3f93dd1d4cb3	930	/* If Clause (1) or more is true, but not a duplicate ack, reset
sam_grove	5:3f93dd1d4cb3	931	* count of consecutive duplicate acks */
sam_grove	5:3f93dd1d4cb3	932	if (!found_dupack) {
sam_grove	5:3f93dd1d4cb3	933	pcb->dupacks = 0;
sam_grove	5:3f93dd1d4cb3	934	}
sam_grove	5:3f93dd1d4cb3	935	} else if (TCP_SEQ_BETWEEN(ackno, pcb->lastack+1, pcb->snd_nxt)){
sam_grove	5:3f93dd1d4cb3	936	/* We come here when the ACK acknowledges new data. */
sam_grove	5:3f93dd1d4cb3	937
sam_grove	5:3f93dd1d4cb3	938	/* Reset the "IN Fast Retransmit" flag, since we are no longer
sam_grove	5:3f93dd1d4cb3	939	in fast retransmit. Also reset the congestion window to the
sam_grove	5:3f93dd1d4cb3	940	slow start threshold. */
sam_grove	5:3f93dd1d4cb3	941	if (pcb->flags & TF_INFR) {
sam_grove	5:3f93dd1d4cb3	942	pcb->flags &= ~TF_INFR;
sam_grove	5:3f93dd1d4cb3	943	pcb->cwnd = pcb->ssthresh;
sam_grove	5:3f93dd1d4cb3	944	}
sam_grove	5:3f93dd1d4cb3	945
sam_grove	5:3f93dd1d4cb3	946	/* Reset the number of retransmissions. */
sam_grove	5:3f93dd1d4cb3	947	pcb->nrtx = 0;
sam_grove	5:3f93dd1d4cb3	948
sam_grove	5:3f93dd1d4cb3	949	/* Reset the retransmission time-out. */
sam_grove	5:3f93dd1d4cb3	950	pcb->rto = (pcb->sa >> 3) + pcb->sv;
sam_grove	5:3f93dd1d4cb3	951
sam_grove	5:3f93dd1d4cb3	952	/* Update the send buffer space. Diff between the two can never exceed 64K? */
sam_grove	5:3f93dd1d4cb3	953	pcb->acked = (u16_t)(ackno - pcb->lastack);
sam_grove	5:3f93dd1d4cb3	954
sam_grove	5:3f93dd1d4cb3	955	pcb->snd_buf += pcb->acked;
sam_grove	5:3f93dd1d4cb3	956
sam_grove	5:3f93dd1d4cb3	957	/* Reset the fast retransmit variables. */
sam_grove	5:3f93dd1d4cb3	958	pcb->dupacks = 0;
sam_grove	5:3f93dd1d4cb3	959	pcb->lastack = ackno;
sam_grove	5:3f93dd1d4cb3	960
sam_grove	5:3f93dd1d4cb3	961	/* Update the congestion control variables (cwnd and
sam_grove	5:3f93dd1d4cb3	962	ssthresh). */
sam_grove	5:3f93dd1d4cb3	963	if (pcb->state >= ESTABLISHED) {
sam_grove	5:3f93dd1d4cb3	964	if (pcb->cwnd < pcb->ssthresh) {
sam_grove	5:3f93dd1d4cb3	965	if ((u16_t)(pcb->cwnd + pcb->mss) > pcb->cwnd) {
sam_grove	5:3f93dd1d4cb3	966	pcb->cwnd += pcb->mss;
sam_grove	5:3f93dd1d4cb3	967	}
sam_grove	5:3f93dd1d4cb3	968	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_receive: slow start cwnd %"U16_F"\n", pcb->cwnd));
sam_grove	5:3f93dd1d4cb3	969	} else {
sam_grove	5:3f93dd1d4cb3	970	u16_t new_cwnd = (pcb->cwnd + pcb->mss * pcb->mss / pcb->cwnd);
sam_grove	5:3f93dd1d4cb3	971	if (new_cwnd > pcb->cwnd) {
sam_grove	5:3f93dd1d4cb3	972	pcb->cwnd = new_cwnd;
sam_grove	5:3f93dd1d4cb3	973	}
sam_grove	5:3f93dd1d4cb3	974	LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_receive: congestion avoidance cwnd %"U16_F"\n", pcb->cwnd));
sam_grove	5:3f93dd1d4cb3	975	}
sam_grove	5:3f93dd1d4cb3	976	}
sam_grove	5:3f93dd1d4cb3	977	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: ACK for %"U32_F", unacked->seqno %"U32_F":%"U32_F"\n",
sam_grove	5:3f93dd1d4cb3	978	ackno,
sam_grove	5:3f93dd1d4cb3	979	pcb->unacked != NULL?
sam_grove	5:3f93dd1d4cb3	980	ntohl(pcb->unacked->tcphdr->seqno): 0,
sam_grove	5:3f93dd1d4cb3	981	pcb->unacked != NULL?
sam_grove	5:3f93dd1d4cb3	982	ntohl(pcb->unacked->tcphdr->seqno) + TCP_TCPLEN(pcb->unacked): 0));
sam_grove	5:3f93dd1d4cb3	983
sam_grove	5:3f93dd1d4cb3	984	/* Remove segment from the unacknowledged list if the incoming
sam_grove	5:3f93dd1d4cb3	985	ACK acknowlegdes them. */
sam_grove	5:3f93dd1d4cb3	986	while (pcb->unacked != NULL &&
sam_grove	5:3f93dd1d4cb3	987	TCP_SEQ_LEQ(ntohl(pcb->unacked->tcphdr->seqno) +
sam_grove	5:3f93dd1d4cb3	988	TCP_TCPLEN(pcb->unacked), ackno)) {
sam_grove	5:3f93dd1d4cb3	989	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: removing %"U32_F":%"U32_F" from pcb->unacked\n",
sam_grove	5:3f93dd1d4cb3	990	ntohl(pcb->unacked->tcphdr->seqno),
sam_grove	5:3f93dd1d4cb3	991	ntohl(pcb->unacked->tcphdr->seqno) +
sam_grove	5:3f93dd1d4cb3	992	TCP_TCPLEN(pcb->unacked)));
sam_grove	5:3f93dd1d4cb3	993
sam_grove	5:3f93dd1d4cb3	994	next = pcb->unacked;
sam_grove	5:3f93dd1d4cb3	995	pcb->unacked = pcb->unacked->next;
sam_grove	5:3f93dd1d4cb3	996
sam_grove	5:3f93dd1d4cb3	997	LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_receive: queuelen %"U16_F" ... ", (u16_t)pcb->snd_queuelen));
sam_grove	5:3f93dd1d4cb3	998	LWIP_ASSERT("pcb->snd_queuelen >= pbuf_clen(next->p)", (pcb->snd_queuelen >= pbuf_clen(next->p)));
sam_grove	5:3f93dd1d4cb3	999	/* Prevent ACK for FIN to generate a sent event */
sam_grove	5:3f93dd1d4cb3	1000	if ((pcb->acked != 0) && ((TCPH_FLAGS(next->tcphdr) & TCP_FIN) != 0)) {
sam_grove	5:3f93dd1d4cb3	1001	pcb->acked--;
sam_grove	5:3f93dd1d4cb3	1002	}
sam_grove	5:3f93dd1d4cb3	1003
sam_grove	5:3f93dd1d4cb3	1004	pcb->snd_queuelen -= pbuf_clen(next->p);
sam_grove	5:3f93dd1d4cb3	1005	tcp_seg_free(next);
sam_grove	5:3f93dd1d4cb3	1006
sam_grove	5:3f93dd1d4cb3	1007	LWIP_DEBUGF(TCP_QLEN_DEBUG, ("%"U16_F" (after freeing unacked)\n", (u16_t)pcb->snd_queuelen));
sam_grove	5:3f93dd1d4cb3	1008	if (pcb->snd_queuelen != 0) {
sam_grove	5:3f93dd1d4cb3	1009	LWIP_ASSERT("tcp_receive: valid queue length", pcb->unacked != NULL \|\|
sam_grove	5:3f93dd1d4cb3	1010	pcb->unsent != NULL);
sam_grove	5:3f93dd1d4cb3	1011	}
sam_grove	5:3f93dd1d4cb3	1012	}
sam_grove	5:3f93dd1d4cb3	1013
sam_grove	5:3f93dd1d4cb3	1014	/* If there's nothing left to acknowledge, stop the retransmit
sam_grove	5:3f93dd1d4cb3	1015	timer, otherwise reset it to start again */
sam_grove	5:3f93dd1d4cb3	1016	if(pcb->unacked == NULL)
sam_grove	5:3f93dd1d4cb3	1017	pcb->rtime = -1;
sam_grove	5:3f93dd1d4cb3	1018	else
sam_grove	5:3f93dd1d4cb3	1019	pcb->rtime = 0;
sam_grove	5:3f93dd1d4cb3	1020
sam_grove	5:3f93dd1d4cb3	1021	pcb->polltmr = 0;
sam_grove	5:3f93dd1d4cb3	1022	} else {
sam_grove	5:3f93dd1d4cb3	1023	/* Fix bug bug #21582: out of sequence ACK, didn't really ack anything */
sam_grove	5:3f93dd1d4cb3	1024	pcb->acked = 0;
sam_grove	5:3f93dd1d4cb3	1025	}
sam_grove	5:3f93dd1d4cb3	1026
sam_grove	5:3f93dd1d4cb3	1027	/* We go through the ->unsent list to see if any of the segments
sam_grove	5:3f93dd1d4cb3	1028	on the list are acknowledged by the ACK. This may seem
sam_grove	5:3f93dd1d4cb3	1029	strange since an "unsent" segment shouldn't be acked. The
sam_grove	5:3f93dd1d4cb3	1030	rationale is that lwIP puts all outstanding segments on the
sam_grove	5:3f93dd1d4cb3	1031	->unsent list after a retransmission, so these segments may
sam_grove	5:3f93dd1d4cb3	1032	in fact have been sent once. */
sam_grove	5:3f93dd1d4cb3	1033	while (pcb->unsent != NULL &&
sam_grove	5:3f93dd1d4cb3	1034	TCP_SEQ_BETWEEN(ackno, ntohl(pcb->unsent->tcphdr->seqno) +
sam_grove	5:3f93dd1d4cb3	1035	TCP_TCPLEN(pcb->unsent), pcb->snd_nxt)) {
sam_grove	5:3f93dd1d4cb3	1036	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: removing %"U32_F":%"U32_F" from pcb->unsent\n",
sam_grove	5:3f93dd1d4cb3	1037	ntohl(pcb->unsent->tcphdr->seqno), ntohl(pcb->unsent->tcphdr->seqno) +
sam_grove	5:3f93dd1d4cb3	1038	TCP_TCPLEN(pcb->unsent)));
sam_grove	5:3f93dd1d4cb3	1039
sam_grove	5:3f93dd1d4cb3	1040	next = pcb->unsent;
sam_grove	5:3f93dd1d4cb3	1041	pcb->unsent = pcb->unsent->next;
sam_grove	5:3f93dd1d4cb3	1042	LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_receive: queuelen %"U16_F" ... ", (u16_t)pcb->snd_queuelen));
sam_grove	5:3f93dd1d4cb3	1043	LWIP_ASSERT("pcb->snd_queuelen >= pbuf_clen(next->p)", (pcb->snd_queuelen >= pbuf_clen(next->p)));
sam_grove	5:3f93dd1d4cb3	1044	/* Prevent ACK for FIN to generate a sent event */
sam_grove	5:3f93dd1d4cb3	1045	if ((pcb->acked != 0) && ((TCPH_FLAGS(next->tcphdr) & TCP_FIN) != 0)) {
sam_grove	5:3f93dd1d4cb3	1046	pcb->acked--;
sam_grove	5:3f93dd1d4cb3	1047	}
sam_grove	5:3f93dd1d4cb3	1048	pcb->snd_queuelen -= pbuf_clen(next->p);
sam_grove	5:3f93dd1d4cb3	1049	tcp_seg_free(next);
sam_grove	5:3f93dd1d4cb3	1050	LWIP_DEBUGF(TCP_QLEN_DEBUG, ("%"U16_F" (after freeing unsent)\n", (u16_t)pcb->snd_queuelen));
sam_grove	5:3f93dd1d4cb3	1051	if (pcb->snd_queuelen != 0) {
sam_grove	5:3f93dd1d4cb3	1052	LWIP_ASSERT("tcp_receive: valid queue length",
sam_grove	5:3f93dd1d4cb3	1053	pcb->unacked != NULL \|\| pcb->unsent != NULL);
sam_grove	5:3f93dd1d4cb3	1054	}
sam_grove	5:3f93dd1d4cb3	1055	}
sam_grove	5:3f93dd1d4cb3	1056	/* End of ACK for new data processing. */
sam_grove	5:3f93dd1d4cb3	1057
sam_grove	5:3f93dd1d4cb3	1058	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_receive: pcb->rttest %"U32_F" rtseq %"U32_F" ackno %"U32_F"\n",
sam_grove	5:3f93dd1d4cb3	1059	pcb->rttest, pcb->rtseq, ackno));
sam_grove	5:3f93dd1d4cb3	1060
sam_grove	5:3f93dd1d4cb3	1061	/* RTT estimation calculations. This is done by checking if the
sam_grove	5:3f93dd1d4cb3	1062	incoming segment acknowledges the segment we use to take a
sam_grove	5:3f93dd1d4cb3	1063	round-trip time measurement. */
sam_grove	5:3f93dd1d4cb3	1064	if (pcb->rttest && TCP_SEQ_LT(pcb->rtseq, ackno)) {
sam_grove	5:3f93dd1d4cb3	1065	/* diff between this shouldn't exceed 32K since this are tcp timer ticks
sam_grove	5:3f93dd1d4cb3	1066	and a round-trip shouldn't be that long... */
sam_grove	5:3f93dd1d4cb3	1067	m = (s16_t)(tcp_ticks - pcb->rttest);
sam_grove	5:3f93dd1d4cb3	1068
sam_grove	5:3f93dd1d4cb3	1069	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_receive: experienced rtt %"U16_F" ticks (%"U16_F" msec).\n",
sam_grove	5:3f93dd1d4cb3	1070	m, m * TCP_SLOW_INTERVAL));
sam_grove	5:3f93dd1d4cb3	1071
sam_grove	5:3f93dd1d4cb3	1072	/* This is taken directly from VJs original code in his paper */
sam_grove	5:3f93dd1d4cb3	1073	m = m - (pcb->sa >> 3);
sam_grove	5:3f93dd1d4cb3	1074	pcb->sa += m;
sam_grove	5:3f93dd1d4cb3	1075	if (m < 0) {
sam_grove	5:3f93dd1d4cb3	1076	m = -m;
sam_grove	5:3f93dd1d4cb3	1077	}
sam_grove	5:3f93dd1d4cb3	1078	m = m - (pcb->sv >> 2);
sam_grove	5:3f93dd1d4cb3	1079	pcb->sv += m;
sam_grove	5:3f93dd1d4cb3	1080	pcb->rto = (pcb->sa >> 3) + pcb->sv;
sam_grove	5:3f93dd1d4cb3	1081
sam_grove	5:3f93dd1d4cb3	1082	LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_receive: RTO %"U16_F" (%"U16_F" milliseconds)\n",
sam_grove	5:3f93dd1d4cb3	1083	pcb->rto, pcb->rto * TCP_SLOW_INTERVAL));
sam_grove	5:3f93dd1d4cb3	1084
sam_grove	5:3f93dd1d4cb3	1085	pcb->rttest = 0;
sam_grove	5:3f93dd1d4cb3	1086	}
sam_grove	5:3f93dd1d4cb3	1087	}
sam_grove	5:3f93dd1d4cb3	1088
sam_grove	5:3f93dd1d4cb3	1089	/* If the incoming segment contains data, we must process it
sam_grove	5:3f93dd1d4cb3	1090	further. */
sam_grove	5:3f93dd1d4cb3	1091	if (tcplen > 0) {
sam_grove	5:3f93dd1d4cb3	1092	/* This code basically does three things:
sam_grove	5:3f93dd1d4cb3	1093
sam_grove	5:3f93dd1d4cb3	1094	+) If the incoming segment contains data that is the next
sam_grove	5:3f93dd1d4cb3	1095	in-sequence data, this data is passed to the application. This
sam_grove	5:3f93dd1d4cb3	1096	might involve trimming the first edge of the data. The rcv_nxt
sam_grove	5:3f93dd1d4cb3	1097	variable and the advertised window are adjusted.
sam_grove	5:3f93dd1d4cb3	1098
sam_grove	5:3f93dd1d4cb3	1099	+) If the incoming segment has data that is above the next
sam_grove	5:3f93dd1d4cb3	1100	sequence number expected (->rcv_nxt), the segment is placed on
sam_grove	5:3f93dd1d4cb3	1101	the ->ooseq queue. This is done by finding the appropriate
sam_grove	5:3f93dd1d4cb3	1102	place in the ->ooseq queue (which is ordered by sequence
sam_grove	5:3f93dd1d4cb3	1103	number) and trim the segment in both ends if needed. An
sam_grove	5:3f93dd1d4cb3	1104	immediate ACK is sent to indicate that we received an
sam_grove	5:3f93dd1d4cb3	1105	out-of-sequence segment.
sam_grove	5:3f93dd1d4cb3	1106
sam_grove	5:3f93dd1d4cb3	1107	+) Finally, we check if the first segment on the ->ooseq queue
sam_grove	5:3f93dd1d4cb3	1108	now is in sequence (i.e., if rcv_nxt >= ooseq->seqno). If
sam_grove	5:3f93dd1d4cb3	1109	rcv_nxt > ooseq->seqno, we must trim the first edge of the
sam_grove	5:3f93dd1d4cb3	1110	segment on ->ooseq before we adjust rcv_nxt. The data in the
sam_grove	5:3f93dd1d4cb3	1111	segments that are now on sequence are chained onto the
sam_grove	5:3f93dd1d4cb3	1112	incoming segment so that we only need to call the application
sam_grove	5:3f93dd1d4cb3	1113	once.
sam_grove	5:3f93dd1d4cb3	1114	*/
sam_grove	5:3f93dd1d4cb3	1115
sam_grove	5:3f93dd1d4cb3	1116	/* First, we check if we must trim the first edge. We have to do
sam_grove	5:3f93dd1d4cb3	1117	this if the sequence number of the incoming segment is less
sam_grove	5:3f93dd1d4cb3	1118	than rcv_nxt, and the sequence number plus the length of the
sam_grove	5:3f93dd1d4cb3	1119	segment is larger than rcv_nxt. */
sam_grove	5:3f93dd1d4cb3	1120	/* if (TCP_SEQ_LT(seqno, pcb->rcv_nxt)){
sam_grove	5:3f93dd1d4cb3	1121	if (TCP_SEQ_LT(pcb->rcv_nxt, seqno + tcplen)) {*/
sam_grove	5:3f93dd1d4cb3	1122	if (TCP_SEQ_BETWEEN(pcb->rcv_nxt, seqno + 1, seqno + tcplen - 1)){
sam_grove	5:3f93dd1d4cb3	1123	/* Trimming the first edge is done by pushing the payload
sam_grove	5:3f93dd1d4cb3	1124	pointer in the pbuf downwards. This is somewhat tricky since
sam_grove	5:3f93dd1d4cb3	1125	we do not want to discard the full contents of the pbuf up to
sam_grove	5:3f93dd1d4cb3	1126	the new starting point of the data since we have to keep the
sam_grove	5:3f93dd1d4cb3	1127	TCP header which is present in the first pbuf in the chain.
sam_grove	5:3f93dd1d4cb3	1128
sam_grove	5:3f93dd1d4cb3	1129	What is done is really quite a nasty hack: the first pbuf in
sam_grove	5:3f93dd1d4cb3	1130	the pbuf chain is pointed to by inseg.p. Since we need to be
sam_grove	5:3f93dd1d4cb3	1131	able to deallocate the whole pbuf, we cannot change this
sam_grove	5:3f93dd1d4cb3	1132	inseg.p pointer to point to any of the later pbufs in the
sam_grove	5:3f93dd1d4cb3	1133	chain. Instead, we point the ->payload pointer in the first
sam_grove	5:3f93dd1d4cb3	1134	pbuf to data in one of the later pbufs. We also set the
sam_grove	5:3f93dd1d4cb3	1135	inseg.data pointer to point to the right place. This way, the
sam_grove	5:3f93dd1d4cb3	1136	->p pointer will still point to the first pbuf, but the
sam_grove	5:3f93dd1d4cb3	1137	->p->payload pointer will point to data in another pbuf.
sam_grove	5:3f93dd1d4cb3	1138
sam_grove	5:3f93dd1d4cb3	1139	After we are done with adjusting the pbuf pointers we must
sam_grove	5:3f93dd1d4cb3	1140	adjust the ->data pointer in the seg and the segment
sam_grove	5:3f93dd1d4cb3	1141	length.*/
sam_grove	5:3f93dd1d4cb3	1142
sam_grove	5:3f93dd1d4cb3	1143	off = pcb->rcv_nxt - seqno;
sam_grove	5:3f93dd1d4cb3	1144	p = inseg.p;
sam_grove	5:3f93dd1d4cb3	1145	LWIP_ASSERT("inseg.p != NULL", inseg.p);
sam_grove	5:3f93dd1d4cb3	1146	LWIP_ASSERT("insane offset!", (off < 0x7fff));
sam_grove	5:3f93dd1d4cb3	1147	if (inseg.p->len < off) {
sam_grove	5:3f93dd1d4cb3	1148	LWIP_ASSERT("pbuf too short!", (((s32_t)inseg.p->tot_len) >= off));
sam_grove	5:3f93dd1d4cb3	1149	new_tot_len = (u16_t)(inseg.p->tot_len - off);
sam_grove	5:3f93dd1d4cb3	1150	while (p->len < off) {
sam_grove	5:3f93dd1d4cb3	1151	off -= p->len;
sam_grove	5:3f93dd1d4cb3	1152	/* KJM following line changed (with addition of new_tot_len var)
sam_grove	5:3f93dd1d4cb3	1153	to fix bug #9076
sam_grove	5:3f93dd1d4cb3	1154	inseg.p->tot_len -= p->len; */
sam_grove	5:3f93dd1d4cb3	1155	p->tot_len = new_tot_len;
sam_grove	5:3f93dd1d4cb3	1156	p->len = 0;
sam_grove	5:3f93dd1d4cb3	1157	p = p->next;
sam_grove	5:3f93dd1d4cb3	1158	}
sam_grove	5:3f93dd1d4cb3	1159	if(pbuf_header(p, (s16_t)-off)) {
sam_grove	5:3f93dd1d4cb3	1160	/* Do we need to cope with this failing? Assert for now */
sam_grove	5:3f93dd1d4cb3	1161	LWIP_ASSERT("pbuf_header failed", 0);
sam_grove	5:3f93dd1d4cb3	1162	}
sam_grove	5:3f93dd1d4cb3	1163	} else {
sam_grove	5:3f93dd1d4cb3	1164	if(pbuf_header(inseg.p, (s16_t)-off)) {
sam_grove	5:3f93dd1d4cb3	1165	/* Do we need to cope with this failing? Assert for now */
sam_grove	5:3f93dd1d4cb3	1166	LWIP_ASSERT("pbuf_header failed", 0);
sam_grove	5:3f93dd1d4cb3	1167	}
sam_grove	5:3f93dd1d4cb3	1168	}
sam_grove	5:3f93dd1d4cb3	1169	inseg.len -= (u16_t)(pcb->rcv_nxt - seqno);
sam_grove	5:3f93dd1d4cb3	1170	inseg.tcphdr->seqno = seqno = pcb->rcv_nxt;
sam_grove	5:3f93dd1d4cb3	1171	}
sam_grove	5:3f93dd1d4cb3	1172	else {
sam_grove	5:3f93dd1d4cb3	1173	if (TCP_SEQ_LT(seqno, pcb->rcv_nxt)){
sam_grove	5:3f93dd1d4cb3	1174	/* the whole segment is < rcv_nxt */
sam_grove	5:3f93dd1d4cb3	1175	/* must be a duplicate of a packet that has already been correctly handled */
sam_grove	5:3f93dd1d4cb3	1176
sam_grove	5:3f93dd1d4cb3	1177	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: duplicate seqno %"U32_F"\n", seqno));
sam_grove	5:3f93dd1d4cb3	1178	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	1179	}
sam_grove	5:3f93dd1d4cb3	1180	}
sam_grove	5:3f93dd1d4cb3	1181
sam_grove	5:3f93dd1d4cb3	1182	/* The sequence number must be within the window (above rcv_nxt
sam_grove	5:3f93dd1d4cb3	1183	and below rcv_nxt + rcv_wnd) in order to be further
sam_grove	5:3f93dd1d4cb3	1184	processed. */
sam_grove	5:3f93dd1d4cb3	1185	if (TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt,
sam_grove	5:3f93dd1d4cb3	1186	pcb->rcv_nxt + pcb->rcv_wnd - 1)){
sam_grove	5:3f93dd1d4cb3	1187	if (pcb->rcv_nxt == seqno) {
sam_grove	5:3f93dd1d4cb3	1188	/* The incoming segment is the next in sequence. We check if
sam_grove	5:3f93dd1d4cb3	1189	we have to trim the end of the segment and update rcv_nxt
sam_grove	5:3f93dd1d4cb3	1190	and pass the data to the application. */
sam_grove	5:3f93dd1d4cb3	1191	tcplen = TCP_TCPLEN(&inseg);
sam_grove	5:3f93dd1d4cb3	1192
sam_grove	5:3f93dd1d4cb3	1193	if (tcplen > pcb->rcv_wnd) {
sam_grove	5:3f93dd1d4cb3	1194	LWIP_DEBUGF(TCP_INPUT_DEBUG,
sam_grove	5:3f93dd1d4cb3	1195	("tcp_receive: other end overran receive window"
sam_grove	5:3f93dd1d4cb3	1196	"seqno %"U32_F" len %"U16_F" right edge %"U32_F"\n",
sam_grove	5:3f93dd1d4cb3	1197	seqno, tcplen, pcb->rcv_nxt + pcb->rcv_wnd));
sam_grove	5:3f93dd1d4cb3	1198	if (TCPH_FLAGS(inseg.tcphdr) & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	1199	/* Must remove the FIN from the header as we're trimming
sam_grove	5:3f93dd1d4cb3	1200	* that byte of sequence-space from the packet */
sam_grove	5:3f93dd1d4cb3	1201	TCPH_FLAGS_SET(inseg.tcphdr, TCPH_FLAGS(inseg.tcphdr) &~ TCP_FIN);
sam_grove	5:3f93dd1d4cb3	1202	}
sam_grove	5:3f93dd1d4cb3	1203	/* Adjust length of segment to fit in the window. */
sam_grove	5:3f93dd1d4cb3	1204	inseg.len = pcb->rcv_wnd;
sam_grove	5:3f93dd1d4cb3	1205	if (TCPH_FLAGS(inseg.tcphdr) & TCP_SYN) {
sam_grove	5:3f93dd1d4cb3	1206	inseg.len -= 1;
sam_grove	5:3f93dd1d4cb3	1207	}
sam_grove	5:3f93dd1d4cb3	1208	pbuf_realloc(inseg.p, inseg.len);
sam_grove	5:3f93dd1d4cb3	1209	tcplen = TCP_TCPLEN(&inseg);
sam_grove	5:3f93dd1d4cb3	1210	LWIP_ASSERT("tcp_receive: segment not trimmed correctly to rcv_wnd\n",
sam_grove	5:3f93dd1d4cb3	1211	(seqno + tcplen) == (pcb->rcv_nxt + pcb->rcv_wnd));
sam_grove	5:3f93dd1d4cb3	1212	}
sam_grove	5:3f93dd1d4cb3	1213	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	1214	/* Received in-sequence data, adjust ooseq data if:
sam_grove	5:3f93dd1d4cb3	1215	- FIN has been received or
sam_grove	5:3f93dd1d4cb3	1216	- inseq overlaps with ooseq */
sam_grove	5:3f93dd1d4cb3	1217	if (pcb->ooseq != NULL) {
sam_grove	5:3f93dd1d4cb3	1218	if (TCPH_FLAGS(inseg.tcphdr) & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	1219	LWIP_DEBUGF(TCP_INPUT_DEBUG,
sam_grove	5:3f93dd1d4cb3	1220	("tcp_receive: received in-order FIN, binning ooseq queue\n"));
sam_grove	5:3f93dd1d4cb3	1221	/* Received in-order FIN means anything that was received
sam_grove	5:3f93dd1d4cb3	1222	* out of order must now have been received in-order, so
sam_grove	5:3f93dd1d4cb3	1223	* bin the ooseq queue */
sam_grove	5:3f93dd1d4cb3	1224	while (pcb->ooseq != NULL) {
sam_grove	5:3f93dd1d4cb3	1225	struct tcp_seg *old_ooseq = pcb->ooseq;
sam_grove	5:3f93dd1d4cb3	1226	pcb->ooseq = pcb->ooseq->next;
sam_grove	5:3f93dd1d4cb3	1227	tcp_seg_free(old_ooseq);
sam_grove	5:3f93dd1d4cb3	1228	}
sam_grove	5:3f93dd1d4cb3	1229	}
sam_grove	5:3f93dd1d4cb3	1230	else {
sam_grove	5:3f93dd1d4cb3	1231	next = pcb->ooseq;
sam_grove	5:3f93dd1d4cb3	1232	/* Remove all segments on ooseq that are covered by inseg already.
sam_grove	5:3f93dd1d4cb3	1233	* FIN is copied from ooseq to inseg if present. */
sam_grove	5:3f93dd1d4cb3	1234	while (next &&
sam_grove	5:3f93dd1d4cb3	1235	TCP_SEQ_GEQ(seqno + tcplen,
sam_grove	5:3f93dd1d4cb3	1236	next->tcphdr->seqno + next->len)) {
sam_grove	5:3f93dd1d4cb3	1237	/* inseg cannot have FIN here (already processed above) */
sam_grove	5:3f93dd1d4cb3	1238	if (TCPH_FLAGS(next->tcphdr) & TCP_FIN &&
sam_grove	5:3f93dd1d4cb3	1239	(TCPH_FLAGS(inseg.tcphdr) & TCP_SYN) == 0) {
sam_grove	5:3f93dd1d4cb3	1240	TCPH_SET_FLAG(inseg.tcphdr, TCP_FIN);
sam_grove	5:3f93dd1d4cb3	1241	tcplen = TCP_TCPLEN(&inseg);
sam_grove	5:3f93dd1d4cb3	1242	}
sam_grove	5:3f93dd1d4cb3	1243	prev = next;
sam_grove	5:3f93dd1d4cb3	1244	next = next->next;
sam_grove	5:3f93dd1d4cb3	1245	tcp_seg_free(prev);
sam_grove	5:3f93dd1d4cb3	1246	}
sam_grove	5:3f93dd1d4cb3	1247	/* Now trim right side of inseg if it overlaps with the first
sam_grove	5:3f93dd1d4cb3	1248	* segment on ooseq */
sam_grove	5:3f93dd1d4cb3	1249	if (next &&
sam_grove	5:3f93dd1d4cb3	1250	TCP_SEQ_GT(seqno + tcplen,
sam_grove	5:3f93dd1d4cb3	1251	next->tcphdr->seqno)) {
sam_grove	5:3f93dd1d4cb3	1252	/* inseg cannot have FIN here (already processed above) */
sam_grove	5:3f93dd1d4cb3	1253	inseg.len = (u16_t)(next->tcphdr->seqno - seqno);
sam_grove	5:3f93dd1d4cb3	1254	if (TCPH_FLAGS(inseg.tcphdr) & TCP_SYN) {
sam_grove	5:3f93dd1d4cb3	1255	inseg.len -= 1;
sam_grove	5:3f93dd1d4cb3	1256	}
sam_grove	5:3f93dd1d4cb3	1257	pbuf_realloc(inseg.p, inseg.len);
sam_grove	5:3f93dd1d4cb3	1258	tcplen = TCP_TCPLEN(&inseg);
sam_grove	5:3f93dd1d4cb3	1259	LWIP_ASSERT("tcp_receive: segment not trimmed correctly to ooseq queue\n",
sam_grove	5:3f93dd1d4cb3	1260	(seqno + tcplen) == next->tcphdr->seqno);
sam_grove	5:3f93dd1d4cb3	1261	}
sam_grove	5:3f93dd1d4cb3	1262	pcb->ooseq = next;
sam_grove	5:3f93dd1d4cb3	1263	}
sam_grove	5:3f93dd1d4cb3	1264	}
sam_grove	5:3f93dd1d4cb3	1265	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	1266
sam_grove	5:3f93dd1d4cb3	1267	pcb->rcv_nxt = seqno + tcplen;
sam_grove	5:3f93dd1d4cb3	1268
sam_grove	5:3f93dd1d4cb3	1269	/* Update the receiver's (our) window. */
sam_grove	5:3f93dd1d4cb3	1270	LWIP_ASSERT("tcp_receive: tcplen > rcv_wnd\n", pcb->rcv_wnd >= tcplen);
sam_grove	5:3f93dd1d4cb3	1271	pcb->rcv_wnd -= tcplen;
sam_grove	5:3f93dd1d4cb3	1272
sam_grove	5:3f93dd1d4cb3	1273	tcp_update_rcv_ann_wnd(pcb);
sam_grove	5:3f93dd1d4cb3	1274
sam_grove	5:3f93dd1d4cb3	1275	/* If there is data in the segment, we make preparations to
sam_grove	5:3f93dd1d4cb3	1276	pass this up to the application. The ->recv_data variable
sam_grove	5:3f93dd1d4cb3	1277	is used for holding the pbuf that goes to the
sam_grove	5:3f93dd1d4cb3	1278	application. The code for reassembling out-of-sequence data
sam_grove	5:3f93dd1d4cb3	1279	chains its data on this pbuf as well.
sam_grove	5:3f93dd1d4cb3	1280
sam_grove	5:3f93dd1d4cb3	1281	If the segment was a FIN, we set the TF_GOT_FIN flag that will
sam_grove	5:3f93dd1d4cb3	1282	be used to indicate to the application that the remote side has
sam_grove	5:3f93dd1d4cb3	1283	closed its end of the connection. */
sam_grove	5:3f93dd1d4cb3	1284	if (inseg.p->tot_len > 0) {
sam_grove	5:3f93dd1d4cb3	1285	recv_data = inseg.p;
sam_grove	5:3f93dd1d4cb3	1286	/* Since this pbuf now is the responsibility of the
sam_grove	5:3f93dd1d4cb3	1287	application, we delete our reference to it so that we won't
sam_grove	5:3f93dd1d4cb3	1288	(mistakingly) deallocate it. */
sam_grove	5:3f93dd1d4cb3	1289	inseg.p = NULL;
sam_grove	5:3f93dd1d4cb3	1290	}
sam_grove	5:3f93dd1d4cb3	1291	if (TCPH_FLAGS(inseg.tcphdr) & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	1292	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: received FIN.\n"));
sam_grove	5:3f93dd1d4cb3	1293	recv_flags \|= TF_GOT_FIN;
sam_grove	5:3f93dd1d4cb3	1294	}
sam_grove	5:3f93dd1d4cb3	1295
sam_grove	5:3f93dd1d4cb3	1296	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	1297	/* We now check if we have segments on the ->ooseq queue that
sam_grove	5:3f93dd1d4cb3	1298	are now in sequence. */
sam_grove	5:3f93dd1d4cb3	1299	while (pcb->ooseq != NULL &&
sam_grove	5:3f93dd1d4cb3	1300	pcb->ooseq->tcphdr->seqno == pcb->rcv_nxt) {
sam_grove	5:3f93dd1d4cb3	1301
sam_grove	5:3f93dd1d4cb3	1302	cseg = pcb->ooseq;
sam_grove	5:3f93dd1d4cb3	1303	seqno = pcb->ooseq->tcphdr->seqno;
sam_grove	5:3f93dd1d4cb3	1304
sam_grove	5:3f93dd1d4cb3	1305	pcb->rcv_nxt += TCP_TCPLEN(cseg);
sam_grove	5:3f93dd1d4cb3	1306	LWIP_ASSERT("tcp_receive: ooseq tcplen > rcv_wnd\n",
sam_grove	5:3f93dd1d4cb3	1307	pcb->rcv_wnd >= TCP_TCPLEN(cseg));
sam_grove	5:3f93dd1d4cb3	1308	pcb->rcv_wnd -= TCP_TCPLEN(cseg);
sam_grove	5:3f93dd1d4cb3	1309
sam_grove	5:3f93dd1d4cb3	1310	tcp_update_rcv_ann_wnd(pcb);
sam_grove	5:3f93dd1d4cb3	1311
sam_grove	5:3f93dd1d4cb3	1312	if (cseg->p->tot_len > 0) {
sam_grove	5:3f93dd1d4cb3	1313	/* Chain this pbuf onto the pbuf that we will pass to
sam_grove	5:3f93dd1d4cb3	1314	the application. */
sam_grove	5:3f93dd1d4cb3	1315	if (recv_data) {
sam_grove	5:3f93dd1d4cb3	1316	pbuf_cat(recv_data, cseg->p);
sam_grove	5:3f93dd1d4cb3	1317	} else {
sam_grove	5:3f93dd1d4cb3	1318	recv_data = cseg->p;
sam_grove	5:3f93dd1d4cb3	1319	}
sam_grove	5:3f93dd1d4cb3	1320	cseg->p = NULL;
sam_grove	5:3f93dd1d4cb3	1321	}
sam_grove	5:3f93dd1d4cb3	1322	if (TCPH_FLAGS(cseg->tcphdr) & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	1323	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: dequeued FIN.\n"));
sam_grove	5:3f93dd1d4cb3	1324	recv_flags \|= TF_GOT_FIN;
sam_grove	5:3f93dd1d4cb3	1325	if (pcb->state == ESTABLISHED) { /* force passive close or we can move to active close */
sam_grove	5:3f93dd1d4cb3	1326	pcb->state = CLOSE_WAIT;
sam_grove	5:3f93dd1d4cb3	1327	}
sam_grove	5:3f93dd1d4cb3	1328	}
sam_grove	5:3f93dd1d4cb3	1329
sam_grove	5:3f93dd1d4cb3	1330	pcb->ooseq = cseg->next;
sam_grove	5:3f93dd1d4cb3	1331	tcp_seg_free(cseg);
sam_grove	5:3f93dd1d4cb3	1332	}
sam_grove	5:3f93dd1d4cb3	1333	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	1334
sam_grove	5:3f93dd1d4cb3	1335
sam_grove	5:3f93dd1d4cb3	1336	/* Acknowledge the segment(s). */
sam_grove	5:3f93dd1d4cb3	1337	tcp_ack(pcb);
sam_grove	5:3f93dd1d4cb3	1338
sam_grove	5:3f93dd1d4cb3	1339	} else {
sam_grove	5:3f93dd1d4cb3	1340	/* We get here if the incoming segment is out-of-sequence. */
sam_grove	5:3f93dd1d4cb3	1341	tcp_send_empty_ack(pcb);
sam_grove	5:3f93dd1d4cb3	1342	#if TCP_QUEUE_OOSEQ
sam_grove	5:3f93dd1d4cb3	1343	/* We queue the segment on the ->ooseq queue. */
sam_grove	5:3f93dd1d4cb3	1344	if (pcb->ooseq == NULL) {
sam_grove	5:3f93dd1d4cb3	1345	pcb->ooseq = tcp_seg_copy(&inseg);
sam_grove	5:3f93dd1d4cb3	1346	} else {
sam_grove	5:3f93dd1d4cb3	1347	/* If the queue is not empty, we walk through the queue and
sam_grove	5:3f93dd1d4cb3	1348	try to find a place where the sequence number of the
sam_grove	5:3f93dd1d4cb3	1349	incoming segment is between the sequence numbers of the
sam_grove	5:3f93dd1d4cb3	1350	previous and the next segment on the ->ooseq queue. That is
sam_grove	5:3f93dd1d4cb3	1351	the place where we put the incoming segment. If needed, we
sam_grove	5:3f93dd1d4cb3	1352	trim the second edges of the previous and the incoming
sam_grove	5:3f93dd1d4cb3	1353	segment so that it will fit into the sequence.
sam_grove	5:3f93dd1d4cb3	1354
sam_grove	5:3f93dd1d4cb3	1355	If the incoming segment has the same sequence number as a
sam_grove	5:3f93dd1d4cb3	1356	segment on the ->ooseq queue, we discard the segment that
sam_grove	5:3f93dd1d4cb3	1357	contains less data. */
sam_grove	5:3f93dd1d4cb3	1358
sam_grove	5:3f93dd1d4cb3	1359	prev = NULL;
sam_grove	5:3f93dd1d4cb3	1360	for(next = pcb->ooseq; next != NULL; next = next->next) {
sam_grove	5:3f93dd1d4cb3	1361	if (seqno == next->tcphdr->seqno) {
sam_grove	5:3f93dd1d4cb3	1362	/* The sequence number of the incoming segment is the
sam_grove	5:3f93dd1d4cb3	1363	same as the sequence number of the segment on
sam_grove	5:3f93dd1d4cb3	1364	->ooseq. We check the lengths to see which one to
sam_grove	5:3f93dd1d4cb3	1365	discard. */
sam_grove	5:3f93dd1d4cb3	1366	if (inseg.len > next->len) {
sam_grove	5:3f93dd1d4cb3	1367	/* The incoming segment is larger than the old
sam_grove	5:3f93dd1d4cb3	1368	segment. We replace some segments with the new
sam_grove	5:3f93dd1d4cb3	1369	one. */
sam_grove	5:3f93dd1d4cb3	1370	cseg = tcp_seg_copy(&inseg);
sam_grove	5:3f93dd1d4cb3	1371	if (cseg != NULL) {
sam_grove	5:3f93dd1d4cb3	1372	if (prev != NULL) {
sam_grove	5:3f93dd1d4cb3	1373	prev->next = cseg;
sam_grove	5:3f93dd1d4cb3	1374	} else {
sam_grove	5:3f93dd1d4cb3	1375	pcb->ooseq = cseg;
sam_grove	5:3f93dd1d4cb3	1376	}
sam_grove	5:3f93dd1d4cb3	1377	tcp_oos_insert_segment(cseg, next);
sam_grove	5:3f93dd1d4cb3	1378	}
sam_grove	5:3f93dd1d4cb3	1379	break;
sam_grove	5:3f93dd1d4cb3	1380	} else {
sam_grove	5:3f93dd1d4cb3	1381	/* Either the lenghts are the same or the incoming
sam_grove	5:3f93dd1d4cb3	1382	segment was smaller than the old one; in either
sam_grove	5:3f93dd1d4cb3	1383	case, we ditch the incoming segment. */
sam_grove	5:3f93dd1d4cb3	1384	break;
sam_grove	5:3f93dd1d4cb3	1385	}
sam_grove	5:3f93dd1d4cb3	1386	} else {
sam_grove	5:3f93dd1d4cb3	1387	if (prev == NULL) {
sam_grove	5:3f93dd1d4cb3	1388	if (TCP_SEQ_LT(seqno, next->tcphdr->seqno)) {
sam_grove	5:3f93dd1d4cb3	1389	/* The sequence number of the incoming segment is lower
sam_grove	5:3f93dd1d4cb3	1390	than the sequence number of the first segment on the
sam_grove	5:3f93dd1d4cb3	1391	queue. We put the incoming segment first on the
sam_grove	5:3f93dd1d4cb3	1392	queue. */
sam_grove	5:3f93dd1d4cb3	1393	cseg = tcp_seg_copy(&inseg);
sam_grove	5:3f93dd1d4cb3	1394	if (cseg != NULL) {
sam_grove	5:3f93dd1d4cb3	1395	pcb->ooseq = cseg;
sam_grove	5:3f93dd1d4cb3	1396	tcp_oos_insert_segment(cseg, next);
sam_grove	5:3f93dd1d4cb3	1397	}
sam_grove	5:3f93dd1d4cb3	1398	break;
sam_grove	5:3f93dd1d4cb3	1399	}
sam_grove	5:3f93dd1d4cb3	1400	} else {
sam_grove	5:3f93dd1d4cb3	1401	/*if (TCP_SEQ_LT(prev->tcphdr->seqno, seqno) &&
sam_grove	5:3f93dd1d4cb3	1402	TCP_SEQ_LT(seqno, next->tcphdr->seqno)) {*/
sam_grove	5:3f93dd1d4cb3	1403	if (TCP_SEQ_BETWEEN(seqno, prev->tcphdr->seqno+1, next->tcphdr->seqno-1)) {
sam_grove	5:3f93dd1d4cb3	1404	/* The sequence number of the incoming segment is in
sam_grove	5:3f93dd1d4cb3	1405	between the sequence numbers of the previous and
sam_grove	5:3f93dd1d4cb3	1406	the next segment on ->ooseq. We trim trim the previous
sam_grove	5:3f93dd1d4cb3	1407	segment, delete next segments that included in received segment
sam_grove	5:3f93dd1d4cb3	1408	and trim received, if needed. */
sam_grove	5:3f93dd1d4cb3	1409	cseg = tcp_seg_copy(&inseg);
sam_grove	5:3f93dd1d4cb3	1410	if (cseg != NULL) {
sam_grove	5:3f93dd1d4cb3	1411	if (TCP_SEQ_GT(prev->tcphdr->seqno + prev->len, seqno)) {
sam_grove	5:3f93dd1d4cb3	1412	/* We need to trim the prev segment. */
sam_grove	5:3f93dd1d4cb3	1413	prev->len = (u16_t)(seqno - prev->tcphdr->seqno);
sam_grove	5:3f93dd1d4cb3	1414	pbuf_realloc(prev->p, prev->len);
sam_grove	5:3f93dd1d4cb3	1415	}
sam_grove	5:3f93dd1d4cb3	1416	prev->next = cseg;
sam_grove	5:3f93dd1d4cb3	1417	tcp_oos_insert_segment(cseg, next);
sam_grove	5:3f93dd1d4cb3	1418	}
sam_grove	5:3f93dd1d4cb3	1419	break;
sam_grove	5:3f93dd1d4cb3	1420	}
sam_grove	5:3f93dd1d4cb3	1421	}
sam_grove	5:3f93dd1d4cb3	1422	/* If the "next" segment is the last segment on the
sam_grove	5:3f93dd1d4cb3	1423	ooseq queue, we add the incoming segment to the end
sam_grove	5:3f93dd1d4cb3	1424	of the list. */
sam_grove	5:3f93dd1d4cb3	1425	if (next->next == NULL &&
sam_grove	5:3f93dd1d4cb3	1426	TCP_SEQ_GT(seqno, next->tcphdr->seqno)) {
sam_grove	5:3f93dd1d4cb3	1427	if (TCPH_FLAGS(next->tcphdr) & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	1428	/* segment "next" already contains all data */
sam_grove	5:3f93dd1d4cb3	1429	break;
sam_grove	5:3f93dd1d4cb3	1430	}
sam_grove	5:3f93dd1d4cb3	1431	next->next = tcp_seg_copy(&inseg);
sam_grove	5:3f93dd1d4cb3	1432	if (next->next != NULL) {
sam_grove	5:3f93dd1d4cb3	1433	if (TCP_SEQ_GT(next->tcphdr->seqno + next->len, seqno)) {
sam_grove	5:3f93dd1d4cb3	1434	/* We need to trim the last segment. */
sam_grove	5:3f93dd1d4cb3	1435	next->len = (u16_t)(seqno - next->tcphdr->seqno);
sam_grove	5:3f93dd1d4cb3	1436	pbuf_realloc(next->p, next->len);
sam_grove	5:3f93dd1d4cb3	1437	}
sam_grove	5:3f93dd1d4cb3	1438	/* check if the remote side overruns our receive window */
sam_grove	5:3f93dd1d4cb3	1439	if ((u32_t)tcplen + seqno > pcb->rcv_nxt + (u32_t)pcb->rcv_wnd) {
sam_grove	5:3f93dd1d4cb3	1440	LWIP_DEBUGF(TCP_INPUT_DEBUG,
sam_grove	5:3f93dd1d4cb3	1441	("tcp_receive: other end overran receive window"
sam_grove	5:3f93dd1d4cb3	1442	"seqno %"U32_F" len %"U16_F" right edge %"U32_F"\n",
sam_grove	5:3f93dd1d4cb3	1443	seqno, tcplen, pcb->rcv_nxt + pcb->rcv_wnd));
sam_grove	5:3f93dd1d4cb3	1444	if (TCPH_FLAGS(next->next->tcphdr) & TCP_FIN) {
sam_grove	5:3f93dd1d4cb3	1445	/* Must remove the FIN from the header as we're trimming
sam_grove	5:3f93dd1d4cb3	1446	* that byte of sequence-space from the packet */
sam_grove	5:3f93dd1d4cb3	1447	TCPH_FLAGS_SET(next->next->tcphdr, TCPH_FLAGS(next->next->tcphdr) &~ TCP_FIN);
sam_grove	5:3f93dd1d4cb3	1448	}
sam_grove	5:3f93dd1d4cb3	1449	/* Adjust length of segment to fit in the window. */
sam_grove	5:3f93dd1d4cb3	1450	next->next->len = pcb->rcv_nxt + pcb->rcv_wnd - seqno;
sam_grove	5:3f93dd1d4cb3	1451	pbuf_realloc(next->next->p, next->next->len);
sam_grove	5:3f93dd1d4cb3	1452	tcplen = TCP_TCPLEN(next->next);
sam_grove	5:3f93dd1d4cb3	1453	LWIP_ASSERT("tcp_receive: segment not trimmed correctly to rcv_wnd\n",
sam_grove	5:3f93dd1d4cb3	1454	(seqno + tcplen) == (pcb->rcv_nxt + pcb->rcv_wnd));
sam_grove	5:3f93dd1d4cb3	1455	}
sam_grove	5:3f93dd1d4cb3	1456	}
sam_grove	5:3f93dd1d4cb3	1457	break;
sam_grove	5:3f93dd1d4cb3	1458	}
sam_grove	5:3f93dd1d4cb3	1459	}
sam_grove	5:3f93dd1d4cb3	1460	prev = next;
sam_grove	5:3f93dd1d4cb3	1461	}
sam_grove	5:3f93dd1d4cb3	1462	}
sam_grove	5:3f93dd1d4cb3	1463	#endif /* TCP_QUEUE_OOSEQ */
sam_grove	5:3f93dd1d4cb3	1464
sam_grove	5:3f93dd1d4cb3	1465	}
sam_grove	5:3f93dd1d4cb3	1466	} else {
sam_grove	5:3f93dd1d4cb3	1467	/* The incoming segment is not withing the window. */
sam_grove	5:3f93dd1d4cb3	1468	tcp_send_empty_ack(pcb);
sam_grove	5:3f93dd1d4cb3	1469	}
sam_grove	5:3f93dd1d4cb3	1470	} else {
sam_grove	5:3f93dd1d4cb3	1471	/* Segments with length 0 is taken care of here. Segments that
sam_grove	5:3f93dd1d4cb3	1472	fall out of the window are ACKed. */
sam_grove	5:3f93dd1d4cb3	1473	/*if (TCP_SEQ_GT(pcb->rcv_nxt, seqno) \|\|
sam_grove	5:3f93dd1d4cb3	1474	TCP_SEQ_GEQ(seqno, pcb->rcv_nxt + pcb->rcv_wnd)) {*/
sam_grove	5:3f93dd1d4cb3	1475	if(!TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt, pcb->rcv_nxt + pcb->rcv_wnd-1)){
sam_grove	5:3f93dd1d4cb3	1476	tcp_ack_now(pcb);
sam_grove	5:3f93dd1d4cb3	1477	}
sam_grove	5:3f93dd1d4cb3	1478	}
sam_grove	5:3f93dd1d4cb3	1479	}
sam_grove	5:3f93dd1d4cb3	1480
sam_grove	5:3f93dd1d4cb3	1481	/**
sam_grove	5:3f93dd1d4cb3	1482	* Parses the options contained in the incoming segment.
sam_grove	5:3f93dd1d4cb3	1483	*
sam_grove	5:3f93dd1d4cb3	1484	* Called from tcp_listen_input() and tcp_process().
sam_grove	5:3f93dd1d4cb3	1485	* Currently, only the MSS option is supported!
sam_grove	5:3f93dd1d4cb3	1486	*
sam_grove	5:3f93dd1d4cb3	1487	* @param pcb the tcp_pcb for which a segment arrived
sam_grove	5:3f93dd1d4cb3	1488	*/
sam_grove	5:3f93dd1d4cb3	1489	static void
sam_grove	5:3f93dd1d4cb3	1490	tcp_parseopt(struct tcp_pcb *pcb)
sam_grove	5:3f93dd1d4cb3	1491	{
sam_grove	5:3f93dd1d4cb3	1492	u16_t c, max_c;
sam_grove	5:3f93dd1d4cb3	1493	u16_t mss;
sam_grove	5:3f93dd1d4cb3	1494	u8_t *opts, opt;
sam_grove	5:3f93dd1d4cb3	1495	#if LWIP_TCP_TIMESTAMPS
sam_grove	5:3f93dd1d4cb3	1496	u32_t tsval;
sam_grove	5:3f93dd1d4cb3	1497	#endif
sam_grove	5:3f93dd1d4cb3	1498
sam_grove	5:3f93dd1d4cb3	1499	opts = (u8_t *)tcphdr + TCP_HLEN;
sam_grove	5:3f93dd1d4cb3	1500
sam_grove	5:3f93dd1d4cb3	1501	/* Parse the TCP MSS option, if present. */
sam_grove	5:3f93dd1d4cb3	1502	if(TCPH_HDRLEN(tcphdr) > 0x5) {
sam_grove	5:3f93dd1d4cb3	1503	max_c = (TCPH_HDRLEN(tcphdr) - 5) << 2;
sam_grove	5:3f93dd1d4cb3	1504	for (c = 0; c < max_c; ) {
sam_grove	5:3f93dd1d4cb3	1505	opt = opts[c];
sam_grove	5:3f93dd1d4cb3	1506	switch (opt) {
sam_grove	5:3f93dd1d4cb3	1507	case 0x00:
sam_grove	5:3f93dd1d4cb3	1508	/* End of options. */
sam_grove	5:3f93dd1d4cb3	1509	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: EOL\n"));
sam_grove	5:3f93dd1d4cb3	1510	return;
sam_grove	5:3f93dd1d4cb3	1511	case 0x01:
sam_grove	5:3f93dd1d4cb3	1512	/* NOP option. */
sam_grove	5:3f93dd1d4cb3	1513	++c;
sam_grove	5:3f93dd1d4cb3	1514	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: NOP\n"));
sam_grove	5:3f93dd1d4cb3	1515	break;
sam_grove	5:3f93dd1d4cb3	1516	case 0x02:
sam_grove	5:3f93dd1d4cb3	1517	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: MSS\n"));
sam_grove	5:3f93dd1d4cb3	1518	if (opts[c + 1] != 0x04 \|\| c + 0x04 > max_c) {
sam_grove	5:3f93dd1d4cb3	1519	/* Bad length */
sam_grove	5:3f93dd1d4cb3	1520	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: bad length\n"));
sam_grove	5:3f93dd1d4cb3	1521	return;
sam_grove	5:3f93dd1d4cb3	1522	}
sam_grove	5:3f93dd1d4cb3	1523	/* An MSS option with the right option length. */
sam_grove	5:3f93dd1d4cb3	1524	mss = (opts[c + 2] << 8) \| opts[c + 3];
sam_grove	5:3f93dd1d4cb3	1525	/* Limit the mss to the configured TCP_MSS and prevent division by zero */
sam_grove	5:3f93dd1d4cb3	1526	pcb->mss = ((mss > TCP_MSS) \|\| (mss == 0)) ? TCP_MSS : mss;
sam_grove	5:3f93dd1d4cb3	1527	/* Advance to next option */
sam_grove	5:3f93dd1d4cb3	1528	c += 0x04;
sam_grove	5:3f93dd1d4cb3	1529	break;
sam_grove	5:3f93dd1d4cb3	1530	#if LWIP_TCP_TIMESTAMPS
sam_grove	5:3f93dd1d4cb3	1531	case 0x08:
sam_grove	5:3f93dd1d4cb3	1532	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: TS\n"));
sam_grove	5:3f93dd1d4cb3	1533	if (opts[c + 1] != 0x0A \|\| c + 0x0A > max_c) {
sam_grove	5:3f93dd1d4cb3	1534	/* Bad length */
sam_grove	5:3f93dd1d4cb3	1535	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: bad length\n"));
sam_grove	5:3f93dd1d4cb3	1536	return;
sam_grove	5:3f93dd1d4cb3	1537	}
sam_grove	5:3f93dd1d4cb3	1538	/* TCP timestamp option with valid length */
sam_grove	5:3f93dd1d4cb3	1539	tsval = (opts[c+2]) \| (opts[c+3] << 8) \|
sam_grove	5:3f93dd1d4cb3	1540	(opts[c+4] << 16) \| (opts[c+5] << 24);
sam_grove	5:3f93dd1d4cb3	1541	if (flags & TCP_SYN) {
sam_grove	5:3f93dd1d4cb3	1542	pcb->ts_recent = ntohl(tsval);
sam_grove	5:3f93dd1d4cb3	1543	pcb->flags \|= TF_TIMESTAMP;
sam_grove	5:3f93dd1d4cb3	1544	} else if (TCP_SEQ_BETWEEN(pcb->ts_lastacksent, seqno, seqno+tcplen)) {
sam_grove	5:3f93dd1d4cb3	1545	pcb->ts_recent = ntohl(tsval);
sam_grove	5:3f93dd1d4cb3	1546	}
sam_grove	5:3f93dd1d4cb3	1547	/* Advance to next option */
sam_grove	5:3f93dd1d4cb3	1548	c += 0x0A;
sam_grove	5:3f93dd1d4cb3	1549	break;
sam_grove	5:3f93dd1d4cb3	1550	#endif
sam_grove	5:3f93dd1d4cb3	1551	default:
sam_grove	5:3f93dd1d4cb3	1552	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: other\n"));
sam_grove	5:3f93dd1d4cb3	1553	if (opts[c + 1] == 0) {
sam_grove	5:3f93dd1d4cb3	1554	LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: bad length\n"));
sam_grove	5:3f93dd1d4cb3	1555	/* If the length field is zero, the options are malformed
sam_grove	5:3f93dd1d4cb3	1556	and we don't process them further. */
sam_grove	5:3f93dd1d4cb3	1557	return;
sam_grove	5:3f93dd1d4cb3	1558	}
sam_grove	5:3f93dd1d4cb3	1559	/* All other options have a length field, so that we easily
sam_grove	5:3f93dd1d4cb3	1560	can skip past them. */
sam_grove	5:3f93dd1d4cb3	1561	c += opts[c + 1];
sam_grove	5:3f93dd1d4cb3	1562	}
sam_grove	5:3f93dd1d4cb3	1563	}
sam_grove	5:3f93dd1d4cb3	1564	}
sam_grove	5:3f93dd1d4cb3	1565	}
sam_grove	5:3f93dd1d4cb3	1566
sam_grove	5:3f93dd1d4cb3	1567	#endif /* LWIP_TCP */