// SPDX-License-Identifier: GPL-2.0 // Test shifting of newly-SACKed ranges onto the previous already-SACKed skb. // This variant tests non-FACK SACK with SACKs coming in the order // 2 6 8 3 9, to test what happens when we get a new SACKed range // (for packet 3) that is on the right of an existing SACKed range // (for packet 2). `./defaults.sh` // Establish a connection and send 10 MSS. 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 +0 bind(3, ..., ...) = 0 +0 listen(3, 1) = 0 +0 < S 0:0(0) win 32792 +0 > S. 0:0(0) ack 1 +.1 < . 1:1(0) ack 1 win 1024 +0 accept(3, ..., ...) = 4 +0 write(4, ..., 10000) = 10000 +0 > P. 1:10001(10000) ack 1 +.1 < . 1:1(0) ack 1 win 257 +.001 < . 1:1(0) ack 1 win 257 +.001 < . 1:1(0) ack 1 win 257 // 3 SACKed packets, so we enter Fast Recovery. +0 > . 1:1001(1000) ack 1 +0 %{ assert tcpi_ca_state == TCP_CA_Recovery, tcpi_ca_state }% +0 %{ assert tcpi_lost == 6, tcpi_lost }% // SACK for 3001:4001. // This SACK for an adjacent range causes the sender to // shift the newly-SACKed range onto the previous skb. +.007 < . 1:1(0) ack 1 win 257 +0 > . 1001:2001(1000) ack 1 +0 %{ assert tcpi_lost == 5, tcpi_lost }% +0 %{ assert tcpi_reordering == 6, tcpi_reordering }% // 8001:9001 -> 3001:4001 is 6 // SACK for 9001:10001. +.01 < . 1:1(0) ack 1 win 257 +0 %{ assert tcpi_lost == 5, tcpi_lost }% // ACK for 1:1001 as packets from t=0.303 arrive. +.083 < . 1:1(0) ack 1001 win 257 +0 %{ assert tcpi_lost == 4,tcpi_lost }% // ACK for 1:4001 as packets from t=0.310 arrive. +.017 < . 1:1(0) ack 4001 win 257 +0 %{ assert tcpi_lost == 3,tcpi_lost }% // ACK for 1:7001 as packets from t=0.320 arrive. +.01 < . 1:1(0) ack 7001 win 257 // ACK for all data as packets from t=0.403 arrive. +.1 < . 1:1(0) ack 10001 win 257 +0 %{ assert tcpi_ca_state == TCP_CA_Open, tcpi_ca_state assert tcpi_unacked == 0, tcpi_unacked assert tcpi_sacked == 0, tcpi_sacked assert tcpi_lost == 0, tcpi_lost assert tcpi_retrans == 0, tcpi_retrans }%