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[lwip-users] Upgrading to 2.0.3 from 1.4.1 can't establish tcp connectio
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From: |
Andrew Foss |
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Subject: |
[lwip-users] Upgrading to 2.0.3 from 1.4.1 can't establish tcp connection using raw |
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Date: |
Sun, 8 Jul 2018 13:18:36 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 |
lwip folks,
I've been using version 1.4.1 happily for a while, decided to try 2.0.3
in hopes of doing more ipv6.
I use it pretty simply raw api, event driven with libevent.
Here's what I am scratching my head on, any suggestions would be greatly
appreciated.
SYN packet arrives and lwip send SYN/ACK
ACK packet arrives and lwip resets the connection, because the ack
number which looks correct to me fails TCP_SEQ_BETWEEN because the ackno
is pcb->snd_nxt + 1
tcp_in.c:709
case SYN_RCVD:
if (flags & TCP_ACK) {
/* expected ACK number? */
if (TCP_SEQ_BETWEEN(ackno, pcb->lastack+1, pcb->snd_nxt)) {
This area of the code, just hasn't changed much since 1.4.1