aya-ebpf 0.2.1

A library for writing eBPF programs
Documentation 
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mod cpu_map;
mod dev_map;
mod dev_map_hash;
mod xsk_map;

use aya_ebpf_bindings::{bindings::xdp_action::XDP_REDIRECT, helpers::bpf_redirect_map};
use aya_ebpf_cty::c_void;
pub use cpu_map::CpuMap;
pub use dev_map::{DevMap, DevMapValue};
pub use dev_map_hash::DevMapHash;
pub use xsk_map::XskMap;

/// Wrapper around the `bpf_redirect_map` function.
///
/// # Return value
///
/// - `Ok(XDP_REDIRECT)` on success.
/// - `Err(_)` of the lowest two bits of `flags` on failure.
#[inline(always)]
fn try_redirect_map(def: *mut c_void, key: u32, flags: u64) -> Result<u32, u32> {
    // Return XDP_REDIRECT on success, or the value of the two lower bits of the flags argument on
    // error. Thus I have no idea why it returns a long (i64) instead of something saner, hence the
    // unsigned_abs.
    let ret = unsafe { bpf_redirect_map(def.cast(), key.into(), flags) };
    match ret.unsigned_abs() as u32 {
        XDP_REDIRECT => Ok(XDP_REDIRECT),
        ret => Err(ret),
    }
}