Date: Sat, 20 Feb 2021 21:26:11 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 250360] [tcp] connections should be closed if a same packet without FIN is received after FIN received Message-ID: <bug-250360-7501-BGz0EMkEOD@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-250360-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-250360-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250360 Michael Tuexen <tuexen@freebsd.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|New |Closed Resolution|--- |Works As Intended --- Comment #1 from Michael Tuexen <tuexen@freebsd.org> --- According to RFC 793, page 75, the segment text is ignored in the CLOSE-WAIT state. No state change should happen, the missing FIN bit is ignored. The following packetdrill script shows the behaviour, which is in tune with= RFC 793: 0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) =3D 3 +0.000 fcntl(3, F_GETFL) =3D 0x2 (flags O_RDWR) +0.000 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) =3D 0 +0.000 connect(3, ..., ...) =3D -1 EINPROGRESS (Operation now in progress) +0.000 > S 0:0(0) win 65535 <mss 1460,nop,wscale 6,sackOK,= TS val 100 ecr 0> +0.050 < S. 0:0(0) ack 1 win 65535 <mss 1460,sackOK,eol,eol> +0.000 > . 1:1(0) ack 1 win 65535 +0.050 < F. 1:513(512) ack 1 win 65535 +0.000 > . 1:1(0) ack 514 win 65188 +0.000 recv(3, ..., 256, 0) =3D 256 +0.050 < . 1:1025(1024) ack 1 win 65535 +0.000 > . 1:1(0) ack 514 win 65444 <nop,nop,sack 1:514> +0.000 recv(3, ..., 1024, 0) =3D 256 +0.000 send(3, ..., 512, 0) =3D 512 +0.000 > P. 1:513(512) ack 514 win 65535 +0.000 < . 514:514(0) ack 513 win 65535 +0.000 close(3) =3D 0 +0.000 > F. 513:513(0) ack 514 win 65535 +0.000 < . 514:514(0) ack 514 win 65535 --=20 You are receiving this mail because: You are on the CC list for the bug.=
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