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History

Michal Rostecki a75fc2f769 aya-log: Allow logging `core::net::Ipv4Addr` and `core::net::Ipv6Addr` IP address types are available in `core`, so they can be used also in eBPF programs. This change adds support of these types in aya-log. * Add implementation of `WriteTuBuf` to these types. * Support these types in `Ipv4Formatter` and `Ipv6Formatter`. * Support them with `DisplayHint::Ip`. * Add support for formatting `[u8; 4]`, to be able to handle `Ipv4Addr::octets`.		2 months ago
..
src	aya-log: Allow logging `core::net::Ipv4Addr` and `core::net::Ipv6Addr`	2 months ago
CHANGELOG.md	chore(aya-ebpf): Rename bpf -> ebpf	7 months ago
Cargo.toml	Release aya-log-common v0.1.14, aya-log v0.2.0	7 months ago
README.md	feat(aya-log): Rename BpfLogger to EbpfLogger	7 months ago
release.toml	Re-organize into a single workspace	2 years ago

README.md

aya-log - a logging library for eBPF programs

Overview

aya-log is a logging library for eBPF programs written using aya. Think of it as the log crate for eBPF.

Installation

User space

Add aya-log to Cargo.toml:

[dependencies]
aya-log = { git = "https://github.com/aya-rs/aya", branch = "main" }

eBPF side

Add aya-log-ebpf to Cargo.toml:

[dependencies]
aya-log-ebpf = { git = "https://github.com/aya-rs/aya", branch = "main" }

Example

Here's an example that uses aya-log in conjunction with the env_logger crate to log eBPF messages to the terminal.

User space code

use aya_log::EbpfLogger;

env_logger::init();

// Will log using the default logger, which is TermLogger in this case
EbpfLogger::init(&mut bpf).unwrap();

eBPF code

use aya_log_ebpf::info;

fn try_xdp_firewall(ctx: XdpContext) -> Result<u32, ()> {
    if let Some(port) = tcp_dest_port(&ctx)? {
        if block_port(port) {
            info!(&ctx, "❌ blocked incoming connection on port: {}", port);
            return Ok(XDP_DROP);
        }
    }

    Ok(XDP_PASS)
}