1*5d4cadefSSoham Chakradeo// SPDX-License-Identifier: GPL-2.0 2*5d4cadefSSoham Chakradeo// Verify that established connections drop a segment without the ACK flag set. 3*5d4cadefSSoham Chakradeo 4*5d4cadefSSoham Chakradeo`./defaults.sh` 5*5d4cadefSSoham Chakradeo 6*5d4cadefSSoham Chakradeo// Create a socket. 7*5d4cadefSSoham Chakradeo 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 8*5d4cadefSSoham Chakradeo +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 9*5d4cadefSSoham Chakradeo +0 bind(3, ..., ...) = 0 10*5d4cadefSSoham Chakradeo +0 listen(3, 1) = 0 11*5d4cadefSSoham Chakradeo 12*5d4cadefSSoham Chakradeo// Establish a connection. 13*5d4cadefSSoham Chakradeo +0 < S 0:0(0) win 20000 <mss 1000,sackOK,nop,nop> 14*5d4cadefSSoham Chakradeo +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> 15*5d4cadefSSoham Chakradeo +.01 < . 1:1(0) ack 1 win 20000 16*5d4cadefSSoham Chakradeo +0 accept(3, ..., ...) = 4 17*5d4cadefSSoham Chakradeo 18*5d4cadefSSoham Chakradeo// Receive a segment with no flags set, verify that it's not enqueued. 19*5d4cadefSSoham Chakradeo +.01 < - 1:1001(1000) win 20000 20*5d4cadefSSoham Chakradeo +0 ioctl(4, SIOCINQ, [0]) = 0 21*5d4cadefSSoham Chakradeo 22*5d4cadefSSoham Chakradeo// Receive a segment with ACK flag set, verify that it is enqueued. 23*5d4cadefSSoham Chakradeo +.01 < . 1:1001(1000) ack 1 win 20000 24*5d4cadefSSoham Chakradeo +0 ioctl(4, SIOCINQ, [1000]) = 0 25