r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
setsockopt$inet6_tcp_TCP_FASTOPEN_KEY(r0, 0x6, 0x21, &(0x7f0000000000)="599b8615fca76cfb16ea7ac4d6b11209", 0x10)
getsockopt$inet6_tcp_int(r0, 0x6, 0x21, 0x0, &(0x7f0000000700))