From 7996ae7ccf284718fc98f5ba34c94b044b858ec2 Mon Sep 17 00:00:00 2001
From: Brian Geffon <bgeffon@google.com>
Date: Wed, 23 May 2018 15:00:59 -0700
Subject: Adding test case for RST acceptable ack panic

PiperOrigin-RevId: 197795613
Change-Id: I759dd04995d900cba6b984649fa48bbc880946d6
---
 pkg/tcpip/transport/tcp/tcp_test.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'pkg/tcpip')

diff --git a/pkg/tcpip/transport/tcp/tcp_test.go b/pkg/tcpip/transport/tcp/tcp_test.go
index 3c21a1ec3..8c54310f2 100644
--- a/pkg/tcpip/transport/tcp/tcp_test.go
+++ b/pkg/tcpip/transport/tcp/tcp_test.go
@@ -400,7 +400,20 @@ func TestRstOnCloseWithUnreadData(t *testing.T) {
 		checker.TCP(
 			checker.DstPort(context.TestPort),
 			checker.TCPFlags(header.TCPFlagAck|header.TCPFlagRst),
+			// We shouldn't consume a sequence number on RST.
+			checker.SeqNum(uint32(c.IRS)+1),
 		))
+
+	// This final should be ignored because an ACK on a reset doesn't
+	// mean anything.
+	c.SendPacket(nil, &context.Headers{
+		SrcPort: context.TestPort,
+		DstPort: c.Port,
+		Flags:   header.TCPFlagAck,
+		SeqNum:  seqnum.Value(790 + len(data)),
+		AckNum:  c.IRS.Add(seqnum.Size(2)),
+		RcvWnd:  30000,
+	})
 }
 
 func TestFullWindowReceive(t *testing.T) {
-- 
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