r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
r1 = socket$inet_tcp(0x2, 0x1, 0x0)
setsockopt$inet_tcp_TCP_FASTOPEN_KEY(r1, 0x6, 0x21, &(0x7f0000000240)="2a9c5450ca00", 0x10)
dup3(r0, r1, 0x0)