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Date:      Sat, 13 Feb 2021 07:28:59 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 253476] ipfw keepalive: tcp_do_segment: Timestamp missing, segment silently dropped
Message-ID:  <bug-253476-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D253476

            Bug ID: 253476
           Summary: ipfw keepalive: tcp_do_segment: Timestamp missing,
                    segment silently dropped
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: shoesoft@gmx.net

After upgrading from 12.2 to 13.0-BETA1 TCP connections can no longer trans=
fer
data after being idle.

git bisect revealed the regression was introduced in
283c76c7c3f2f634f19f303a771a3f81fe890cab

The problem is that the keepalive packets for keep-state rules are dropped.
Dynamic rules are removed and the existing connections no longer work.
As a workaround net.inet.tcp.tolerate_missing_ts=3D1 can be used.

How to reproduce:
The test setup uses epair for network communication to rule out a faulty 3rd
party TCP stack. I can also reproduce the problem with real network hosts.
Tested with 13.0-BETA1 amd64 VM-image in virtualbox.

Terminal 1:
kldload ipfw
sysctl net.inet.tcp.log_debug=3D1
sysctl net.inet.ip.fw.dyn_ack_lifetime=3D60 # optional, speeds up testing
ipfw add allow tcp from me to any setup keep-state
ifconfig epair0 create
ifconfig epair0a 10.0.0.101 up
ifconfig epair0b 10.0.0.102 up
while true; do ipfw -Da list; sleep 1; done # list dynamic rules, sh syntax

Terminal 2:
nc -l 10.0.0.101 12345

Terminal 3:
nc -s 10.0.0.102 10.0.0.101 12345

With TCP debug enabled, I can see the following log entry:
TCP: [10.0.0.102]:13140 to [10.0.0.101]:12345 tcpflags 0x10<ACK>;
tcp_do_segment: Timestamp missing, segment silently dropped

The timer of the dynamic rule expires and is removed.

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