1// Test that we retransmit SYN-ACK with ACE and without 2// AccECN options after 3// SYN-ACK was lost and TCP moved to TCPS_SYN_RECEIVED 4 5`./defaults.sh 6sysctl -q net.ipv4.tcp_ecn=3 7sysctl -q net.ipv4.tcp_ecn_option=2 8` 9 10+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 11+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 12+0 bind(3, ..., ...) = 0 13+0 listen(3, 1) = 0 14 15+0 < [noecn] SEWA 0:0(0) win 32792 <mss 1460,nop,nop,sackOK,nop,wscale 8> 16+.002 > [noecn] SW. 0:0(0) ack 1 <mss 1460,ECN e1b 1 ceb 0 e0b 1,nop,nop,nop,sackOK,nop,wscale 8> 17 18// Retransmit SYN-ACK without option 19+1~+1.1 > [noecn] SW. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> 20+0.1 < [noecn] W. 1:1(0) ack 1 win 320 <ECN e0b 1 ceb 0 e1b 1,nop> 21+.002 accept(3, ..., ...) = 4 22 23// We try to write with AccECN option 24+0.01 write(4, ..., 100) = 100 25+.002 > [ect0] P5. 1:101(100) ack 1 <ECN e1b 1 ceb 0 e0b 1,nop> 26