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@ -64,7 +64,6 @@ pub mod uprobe;
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mod utils;
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pub mod xdp;
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use crate::util::KernelVersion;
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use libc::ENOSPC;
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use std::{
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ffi::CString,
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@ -112,8 +111,9 @@ use crate::{
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sys::{
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bpf_btf_get_fd_by_id, bpf_get_object, bpf_load_program, bpf_pin_object,
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bpf_prog_get_fd_by_id, bpf_prog_get_info_by_fd, bpf_prog_get_next_id, bpf_prog_query,
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retry_with_verifier_logs, BpfLoadProgramAttrs,
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retry_with_verifier_logs, BpfLoadProgramAttrs, SyscallError,
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},
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util::KernelVersion,
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VerifierLogLevel,
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};
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@ -147,14 +147,8 @@ pub enum ProgramError {
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},
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/// A syscall failed.
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#[error("`{call}` failed")]
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SyscallError {
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/// The name of the syscall which failed.
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call: &'static str,
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/// The [`io::Error`] returned by the syscall.
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#[source]
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io_error: io::Error,
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},
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#[error(transparent)]
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SyscallError(#[from] SyscallError),
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/// The network interface does not exist.
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#[error("unknown network interface {name}")]
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@ -456,12 +450,11 @@ impl<T: Link> ProgramData<T> {
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None
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};
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let attach_btf_obj_fd = if info.attach_btf_obj_id > 0 {
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let fd = bpf_btf_get_fd_by_id(info.attach_btf_obj_id).map_err(|io_error| {
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ProgramError::SyscallError {
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let fd =
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bpf_btf_get_fd_by_id(info.attach_btf_obj_id).map_err(|io_error| SyscallError {
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call: "bpf_btf_get_fd_by_id",
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io_error,
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}
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})?;
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})?;
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Some(fd as u32)
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} else {
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None
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@ -489,13 +482,12 @@ impl<T: Link> ProgramData<T> {
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) -> Result<ProgramData<T>, ProgramError> {
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let path_string =
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CString::new(path.as_ref().as_os_str().to_string_lossy().as_bytes()).unwrap();
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let fd =
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bpf_get_object(&path_string).map_err(|(_, io_error)| ProgramError::SyscallError {
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call: "bpf_obj_get",
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io_error,
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})? as RawFd;
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let fd = bpf_get_object(&path_string).map_err(|(_, io_error)| SyscallError {
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call: "bpf_obj_get",
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io_error,
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})? as RawFd;
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let info = bpf_prog_get_info_by_fd(fd).map_err(|io_error| ProgramError::SyscallError {
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let info = bpf_prog_get_info_by_fd(fd).map_err(|io_error| SyscallError {
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call: "bpf_prog_get_info_by_fd",
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io_error,
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})?;
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@ -537,8 +529,8 @@ fn pin_program<T: Link, P: AsRef<Path>>(data: &ProgramData<T>, path: P) -> Resul
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error: e.to_string(),
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}
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})?;
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bpf_pin_object(fd, &path_string).map_err(|(_, io_error)| PinError::SyscallError {
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name: "BPF_OBJ_PIN",
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bpf_pin_object(fd, &path_string).map_err(|(_, io_error)| SyscallError {
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call: "BPF_OBJ_PIN",
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io_error,
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})?;
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Ok(())
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@ -665,15 +657,17 @@ pub(crate) fn query<T: AsRawFd>(
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prog_ids.resize(prog_cnt as usize, 0);
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return Ok(prog_ids);
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}
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Err((_, io_error)) if retries == 0 && io_error.raw_os_error() == Some(ENOSPC) => {
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prog_ids.resize(prog_cnt as usize, 0);
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retries += 1;
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}
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Err((_, io_error)) => {
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return Err(ProgramError::SyscallError {
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call: "bpf_prog_query",
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io_error,
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});
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if retries == 0 && io_error.raw_os_error() == Some(ENOSPC) {
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prog_ids.resize(prog_cnt as usize, 0);
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retries += 1;
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} else {
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return Err(SyscallError {
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call: "bpf_prog_query",
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io_error,
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}
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.into());
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}
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}
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}
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}
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@ -951,24 +945,22 @@ impl ProgramInfo {
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///
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/// The returned fd must be closed when no longer needed.
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pub fn fd(&self) -> Result<RawFd, ProgramError> {
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let fd =
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bpf_prog_get_fd_by_id(self.0.id).map_err(|io_error| ProgramError::SyscallError {
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call: "bpf_prog_get_fd_by_id",
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io_error,
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})?;
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let fd = bpf_prog_get_fd_by_id(self.0.id).map_err(|io_error| SyscallError {
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call: "bpf_prog_get_fd_by_id",
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io_error,
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})?;
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Ok(fd.into_raw_fd())
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}
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/// Loads a program from a pinned path in bpffs.
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pub fn from_pin<P: AsRef<Path>>(path: P) -> Result<ProgramInfo, ProgramError> {
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let path_string = CString::new(path.as_ref().to_str().unwrap()).unwrap();
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let fd =
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bpf_get_object(&path_string).map_err(|(_, io_error)| ProgramError::SyscallError {
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call: "BPF_OBJ_GET",
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io_error,
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})? as RawFd;
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let fd = bpf_get_object(&path_string).map_err(|(_, io_error)| SyscallError {
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call: "BPF_OBJ_GET",
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io_error,
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})? as RawFd;
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let info = bpf_prog_get_info_by_fd(fd).map_err(|io_error| ProgramError::SyscallError {
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let info = bpf_prog_get_info_by_fd(fd).map_err(|io_error| SyscallError {
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call: "bpf_prog_get_info_by_fd",
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io_error,
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})?;
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@ -999,18 +991,19 @@ impl Iterator for ProgramsIter {
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self.current = next;
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Some(
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bpf_prog_get_fd_by_id(next)
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.map_err(|io_error| ProgramError::SyscallError {
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.map_err(|io_error| SyscallError {
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call: "bpf_prog_get_fd_by_id",
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io_error,
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})
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.and_then(|fd| {
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bpf_prog_get_info_by_fd(fd.as_raw_fd())
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.map_err(|io_error| ProgramError::SyscallError {
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.map_err(|io_error| SyscallError {
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call: "bpf_prog_get_info_by_fd",
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io_error,
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})
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.map(ProgramInfo)
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}),
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})
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.map_err(Into::into),
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)
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}
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Ok(None) => None,
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@ -1018,10 +1011,11 @@ impl Iterator for ProgramsIter {
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// If getting the next program failed, we have to yield None in our next
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// iteration to avoid an infinite loop.
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self.error = true;
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Some(Err(ProgramError::SyscallError {
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Some(Err(SyscallError {
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call: "bpf_prog_get_fd_by_id",
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io_error,
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}))
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}
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.into()))
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}
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}
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}
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Tamir Duberstein
2 years ago