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// SPDX-License-Identifier: GPL-2.0
// Verify that setsockopt calls that force a route refresh do not
// cause problems matching SACKs with packets in the write queue.
// This variant tests IP_TOS.
`./defaults.sh`
// Establish a connection.
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_IP, IP_MTU_DISCOVER, [IP_PMTUDISC_DONT], 1) = 0
+0...0.010 connect(3, ..., ...) = 0
+0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8>
+.01 < S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 2,nop,nop,sackOK>
+0 > . 1:1(0) ack 1
+.01 write(3, ..., 5840) = 5840
+0 > P. 1:5841(5840) ack 1
+.01 < . 1:1(0) ack 5841 win 65535
+.01 write(3, ..., 5840) = 5840
+0 > P. 5841:11681(5840) ack 1
+.01 < . 1:1(0) ack 11681 win 65535
+.01 write(3, ..., 14600) = 14600
+0 > P. 11681:26281(14600) ack 1
// Try the socket option that we know can force a route refresh.
+0 setsockopt(3, SOL_IP, IP_TOS, [4], 1) = 0
// Then revert to avoid routing/mangling/etc implications of that setting.
+0 setsockopt(3, SOL_IP, IP_TOS, [0], 1) = 0
// Verify that we do not retransmit the SACKed segments.
+.01 < . 1:1(0) ack 13141 win 65535 <sack 16061:17521 20441:26281,nop,nop>
+0 > . 13141:16061(2920) ack 1
+0 > P. 17521:20441(2920) ack 1
+.01 < . 1:1(0) ack 26281 win 65535
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