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@ -11,13 +11,13 @@ use std::{
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str::{FromStr, Utf8Error},
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};
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use libc::{if_nametoindex, sysconf, uname, utsname, _SC_PAGESIZE};
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use crate::{
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generated::{TC_H_MAJ_MASK, TC_H_MIN_MASK},
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Pod,
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};
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use libc::{if_nametoindex, sysconf, uname, utsname, _SC_PAGESIZE};
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/// Represents a kernel version, in major.minor.release version.
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// Adapted from https://docs.rs/procfs/latest/procfs/sys/kernel/struct.Version.html.
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#[derive(Debug, Copy, Clone, Eq, PartialEq, PartialOrd)]
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@ -49,23 +49,43 @@ impl KernelVersion {
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/// Returns the kernel version of the currently running kernel.
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pub fn current() -> Result<Self, impl Error> {
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let kernel_version = Self::get_kernel_version();
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Self::get_kernel_version()
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}
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// The kernel version is clamped to 4.19.255 on kernels 4.19.222 and above.
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//
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// See https://github.com/torvalds/linux/commit/a256aac.
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const CLAMPED_KERNEL_MAJOR: u8 = 4;
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const CLAMPED_KERNEL_MINOR: u8 = 19;
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if let Ok(Self {
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major: CLAMPED_KERNEL_MAJOR,
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minor: CLAMPED_KERNEL_MINOR,
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patch: 222..,
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}) = kernel_version
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{
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return Ok(Self::new(CLAMPED_KERNEL_MAJOR, CLAMPED_KERNEL_MINOR, 255));
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/// The equivalent of LINUX_VERSION_CODE.
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pub(crate) fn code(self) -> u32 {
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let Self {
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major,
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minor,
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mut patch,
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} = self;
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// Certain LTS kernels went above the "max" 255 patch so
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// backports were done to cap the patch version
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let max_patch = match (major, minor) {
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// On 4.4 + 4.9, any patch 257 or above was hardcoded to 255.
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// See: https://github.com/torvalds/linux/commit/a15813a +
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// https://github.com/torvalds/linux/commit/42efb098
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(4, 4 | 9) => 257,
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// On 4.14, any patch 252 or above was hardcoded to 255.
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// See: https://github.com/torvalds/linux/commit/e131e0e
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(4, 14) => 252,
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// On 4.19, any patch 222 or above was hardcoded to 255.
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// See: https://github.com/torvalds/linux/commit/a256aac
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(4, 19) => 222,
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// For other kernels (i.e., newer LTS kernels as other
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// ones won't reach 255+ patches) clamp it to 255. See:
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// https://github.com/torvalds/linux/commit/9b82f13e
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_ => 255,
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};
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// anything greater or equal to `max_patch` is hardcoded to
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// 255.
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if patch >= max_patch {
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patch = 255;
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}
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kernel_version
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(u32::from(major) << 16) + (u32::from(minor) << 8) + u32::from(patch)
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}
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// This is ported from https://github.com/torvalds/linux/blob/3f01e9f/tools/lib/bpf/libbpf_probes.c#L21-L101.
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@ -339,9 +359,10 @@ pub(crate) fn bytes_of_slice<T: Pod>(val: &[T]) -> &[u8] {
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#[cfg(test)]
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mod tests {
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use super::*;
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use assert_matches::assert_matches;
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use super::*;
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#[test]
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fn test_parse_kernel_version_string() {
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// WSL.
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pdliyan
2 years ago