add program_info api

Add a new API macro to each aya `Program` type to allow us to fetch it's
accompanying `ProgramInfo` metadata after it's been loaded.

Signed-off-by: Andrew Stoycos <[email protected]>

aya/src/programs/mod.rs

@@ -914,8 +914,60 @@ impl_try_from_program!(
  CgroupDevice,
 );
 
+/// Returns information about a loaded program with the [`ProgramInfo`] structure.
+///
+/// This information is populated at load time by the kernel and can be used
+/// to correlate a given [`Program`] to it's corresponding [`ProgramInfo`]
+/// metadata.
+macro_rules! impl_program_info {
+ ($($struct_name:ident),+ $(,)?) => {
+ $(
+ impl $struct_name {
+ /// Returns the file descriptor of this Program.
+ pub fn program_info(&self) -> Result<ProgramInfo, ProgramError> {
+ let fd = self.fd().ok_or(ProgramError::NotLoaded)?;
+
+ bpf_prog_get_info_by_fd(fd.as_raw_fd(), None)
+ .map_err(|io_error| ProgramError::SyscallError {
+ call: "bpf_prog_get_info_by_fd".to_owned(),
+ io_error,
+ })
+ .map(ProgramInfo)
+ }
+ }
+ )+
+ }
+}
+
+impl_program_info!(
+ KProbe,
+ UProbe,
+ TracePoint,
+ SocketFilter,
+ Xdp,
+ SkMsg,
+ SkSkb,
+ SchedClassifier,
+ CgroupSkb,
+ CgroupSysctl,
+ CgroupSockopt,
+ LircMode2,
+ PerfEvent,
+ Lsm,
+ RawTracePoint,
+ BtfTracePoint,
+ FEntry,
+ FExit,
+ Extension,
+ CgroupSockAddr,
+ SkLookup,
+ SockOps,
+ CgroupSock,
+ CgroupDevice,
+);
+
 /// Provides information about a loaded program, like name, id and statistics
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct ProgramInfo(bpf_prog_info);
 
 impl ProgramInfo {