v5 has the most comprehensive set of changes yet, and I think should finally address all of the relevant issues brought up on the mailing list. In particular, this feedback has come from: - Andy Lutomirski - Eric Biggers - Ard Biesheuvel - Kevin Easton - Andrew Lunn - Martin Willi Changes v4->v5: --------------- - Use fewer inlines, except when measured as necessary. - Reduce size of scattergather array to fit within stack on small systems. - Account for larger stack frames with KASAN. - The x86_64 implementations are selected according to input length. - Avoid using simd for small blocks on x86_64. - The simd_get/put API is now pass by reference, so that the user can lazily use the context based on whether or not it's needed. See the description again in the first commit for this. - Add cycle counts for different sizes for x86_64 commit messages. - Relax simd during chapoly sg loop. - Replace -include with #if defined(...) - Saner and simpler Kconfig. - Split into separate modules instead of one monolithic zinc. - The combination of these three last items means that there no longer are any conditionals in our Makefile. - Martin showed a performance regression using tcrypt in v4. This has been triaged and fixed, and now the Zinc code runs faster than the previous code. - While I initially wasn't going to do this for the initial patchset, it was just so simple to do: now there's a nosimd module parameter that can be used to disable simd instructions for debugging and testing, or on weird systems. ----------------------------------------------------------- This patchset is available on git.kernel.org in this branch, where it may be pulled directly for inclusion into net-next: * https://git.kernel.org/pub/scm/linux/kernel/git/zx2c4/linux.git/log/?h=jd/wireguard ----------------------------------------------------------- WireGuard is a secure network tunnel written especially for Linux, which has faced around three years of serious development, deployment, and scrutiny. It delivers excellent performance and is extremely easy to use and configure. It has been designed with the primary goal of being both easy to audit by virtue of being small and highly secure from a cryptography and systems security perspective. WireGuard is used by some massive companies pushing enormous amounts of traffic, and likely already today you've consumed bytes that at some point transited through a WireGuard tunnel. Even as an out-of-tree module, WireGuard has been integrated into various userspace tools, Linux distributions, mobile phones, and data centers. There are ports in several languages to several operating systems, and even commercial hardware and services sold integrating WireGuard. It is time, therefore, for WireGuard to be properly integrated into Linux. Ample information, including documentation, installation instructions, and project details, is available at: * https://www.wireguard.com/ * https://www.wireguard.com/papers/wireguard.pdf As it is currently an out-of-tree module, it lives in its own git repo and has its own mailing list, and every commit for the module is tested against every stable kernel since 3.10 on a variety of architectures using an extensive test suite: * https://git.zx2c4.com/WireGuard https://git.kernel.org/pub/scm/linux/kernel/git/zx2c4/WireGuard.git/ * https://lists.zx2c4.com/mailman/listinfo/wireguard * https://www.wireguard.com/build-status/ The project has been broadly discussed at conferences, and was presented to the Netdev developers in Seoul last November, where a paper was released detailing some interesting aspects of the project. Dave asked me after the talk if I would consider sending in a v1 "sooner rather than later", hence this patchset. A decision is still waiting from the Linux Plumbers Conference, but an update on these topics may be presented in Vancouver in a few months. Prior presentations: * https://www.wireguard.com/presentations/ * https://www.wireguard.com/papers/wireguard-netdev22.pdf The cryptography in the protocol itself has been formally verified by several independent academic teams with positive results, and I know of two additional efforts on their way to further corroborate those findings. The version 1 protocol is "complete", and so the purpose of this review is to assess the implementation of the protocol. However, it still may be of interest to know that the thing you're reviewing uses a protocol with various nice security properties: * https://www.wireguard.com/formal-verification/ This patchset is divided into four segments. The first introduces a very simple helper for working with the FPU state for the purposes of amortizing SIMD operations. The second segment is a small collection of cryptographic primitives, split up into several commits by primitive and by hardware. The third shows usage of Zinc within the existing crypto API and as a replacement to the existing crypto API. The last is WireGuard itself, presented as an unintrusive and self-contained virtual network driver. It is intended that this entire patch series enter the kernel through DaveM's net-next tree. Subsequently, WireGuard patches will go through DaveM's net-next tree, while Zinc patches will go through Greg KH's tree. Enjoy, Jason