On 25.08.22 14:49, Yang Hanlin wrote: > Hi all, > > I am learning about the Linux kernel, especially the eBPF subsystem, for > various observability and networking applications. As a practice, I am > developing a simple utility that detects additions and removals of USB devices > and performs actions accordingly. For the sake of practicing eBPF, I plan to > implement this utility by instrumenting kernel functions with kprobes rather > than writing udev rules etc. > > However, I found it not that easy to find the correct hook points. From the > kernel documentation for writing USB device drivers > (https://www.kernel.org/doc/html/latest/driver-api/usb/writing_usb_driver.html), > I learned that there is a `probe` function and a `disconnect` function > provided by a driver (in a `usb_driver` struct, > https://github.com/torvalds/linux/blob/e146caf303493c4f2458173d7f1598b76a9b1396/include/linux/usb.h#L1186-L1189) > for the kernel to call on additions and removals of USB devices respectively. > So I thought finding callers to `probe` and `disconnect` might help; but I did > not find such callers, either by searching `.probe(` in the repository or > using static analysis provided by an IDE. Search for ->probe( instead if you want to find callers. > Is there anything wrong with the methods I am using? How can I find > appropriate hook points for USB device additions & removals in the kernel? Or > is there an alternative solution using eBPF (such as instrumenting udev with a > uprobe)? > > Thanks in advance. > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
