1*88395c07SSoham Chakradeo// SPDX-License-Identifier: GPL-2.0 2*88395c07SSoham Chakradeo// Verify behavior for the sequence: remote side sends FIN, then we close(). 3*88395c07SSoham Chakradeo// Since the remote side (client) closes first, we test our LAST_ACK code path. 4*88395c07SSoham Chakradeo 5*88395c07SSoham Chakradeo`./defaults.sh` 6*88395c07SSoham Chakradeo 7*88395c07SSoham Chakradeo// Initialize a server socket. 8*88395c07SSoham Chakradeo 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 9*88395c07SSoham Chakradeo +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 10*88395c07SSoham Chakradeo +0 bind(3, ..., ...) = 0 11*88395c07SSoham Chakradeo +0 listen(3, 1) = 0 12*88395c07SSoham Chakradeo 13*88395c07SSoham Chakradeo +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7> 14*88395c07SSoham Chakradeo +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> 15*88395c07SSoham Chakradeo +0 < . 1:1(0) ack 1 win 257 16*88395c07SSoham Chakradeo 17*88395c07SSoham Chakradeo +0 accept(3, ..., ...) = 4 18*88395c07SSoham Chakradeo 19*88395c07SSoham Chakradeo// Client closes first. 20*88395c07SSoham Chakradeo +.01 < F. 1:1(0) ack 1 win 257 21*88395c07SSoham Chakradeo +0 > . 1:1(0) ack 2 22*88395c07SSoham Chakradeo 23*88395c07SSoham Chakradeo// App notices that client closed. 24*88395c07SSoham Chakradeo +0 read(4, ..., 1000) = 0 25*88395c07SSoham Chakradeo 26*88395c07SSoham Chakradeo// Then we close. 27*88395c07SSoham Chakradeo +.01 close(4) = 0 28*88395c07SSoham Chakradeo +0 > F. 1:1(0) ack 2 29*88395c07SSoham Chakradeo 30*88395c07SSoham Chakradeo// Client ACKs our FIN. 31*88395c07SSoham Chakradeo +.01 < . 2:2(0) ack 2 win 257 32*88395c07SSoham Chakradeo 33*88395c07SSoham Chakradeo// Verify that we send RST in response to any incoming segments 34*88395c07SSoham Chakradeo// (because the kernel no longer has any record of this socket). 35*88395c07SSoham Chakradeo +.01 < . 2:2(0) ack 2 win 257 36*88395c07SSoham Chakradeo +0 > R 2:2(0) 37