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aya/aya-ebpf-macros/src/cgroup_sock.rs

160 lines
4.5 KiB
Rust

use std::borrow::Cow;
use proc_macro2::TokenStream;
use proc_macro2_diagnostics::{Diagnostic, SpanDiagnosticExt as _};
use quote::quote;
use syn::{spanned::Spanned as _, Ident, ItemFn};
pub(crate) struct CgroupSock {
item: ItemFn,
attach_type: Ident,
}
impl CgroupSock {
pub(crate) fn parse(attrs: TokenStream, item: TokenStream) -> Result<Self, Diagnostic> {
if attrs.is_empty() {
return Err(attrs.span().error("missing attach type"));
}
let item: ItemFn = syn::parse2(item)?;
let attach_type: Ident = syn::parse2(attrs)?;
if attach_type != "post_bind4"
&& attach_type != "post_bind6"
&& attach_type != "sock_create"
&& attach_type != "sock_release"
{
return Err(attach_type.span().error("invalid attach type"));
}
Ok(Self { item, attach_type })
}
pub(crate) fn expand(&self) -> TokenStream {
let Self { item, attach_type } = self;
let ItemFn {
attrs: _,
vis,
sig,
block: _,
} = item;
let section_name: Cow<'_, _> = format!("cgroup/{attach_type}").into();
let fn_name = &sig.ident;
quote! {
#[no_mangle]
#[link_section = #section_name]
#vis fn #fn_name(ctx: *mut ::aya_ebpf::bindings::bpf_sock) -> i32 {
return #fn_name(::aya_ebpf::programs::SockContext::new(ctx));
#item
}
}
}
}
#[cfg(test)]
mod tests {
use syn::parse_quote;
use super::*;
#[test]
fn cgroup_sock_post_bind4() {
let prog = CgroupSock::parse(
parse_quote!(post_bind4),
parse_quote!(
fn foo(ctx: SockContext) -> i32 {
0
}
),
)
.unwrap();
let expanded = prog.expand();
let expected = quote! {
#[no_mangle]
#[link_section = "cgroup/post_bind4"]
fn foo(ctx: *mut ::aya_ebpf::bindings::bpf_sock) -> i32 {
return foo(::aya_ebpf::programs::SockContext::new(ctx));
fn foo(ctx: SockContext) -> i32 {
0
}
}
};
assert_eq!(expected.to_string(), expanded.to_string());
}
#[test]
fn cgroup_sock_post_bind6() {
let prog = CgroupSock::parse(
parse_quote!(post_bind6),
parse_quote!(
fn foo(ctx: SockContext) -> i32 {
0
}
),
)
.unwrap();
let expanded = prog.expand();
let expected = quote! {
#[no_mangle]
#[link_section = "cgroup/post_bind6"]
fn foo(ctx: *mut ::aya_ebpf::bindings::bpf_sock) -> i32 {
return foo(::aya_ebpf::programs::SockContext::new(ctx));
fn foo(ctx: SockContext) -> i32 {
0
}
}
};
assert_eq!(expected.to_string(), expanded.to_string());
}
#[test]
fn cgroup_sock_sock_create() {
let prog = CgroupSock::parse(
parse_quote!(sock_create),
parse_quote!(
fn foo(ctx: SockContext) -> i32 {
0
}
),
)
.unwrap();
let expanded = prog.expand();
let expected = quote! {
#[no_mangle]
#[link_section = "cgroup/sock_create"]
fn foo(ctx: *mut ::aya_ebpf::bindings::bpf_sock) -> i32 {
return foo(::aya_ebpf::programs::SockContext::new(ctx));
fn foo(ctx: SockContext) -> i32 {
0
}
}
};
assert_eq!(expected.to_string(), expanded.to_string());
}
#[test]
fn cgroup_sock_sock_release() {
let prog = CgroupSock::parse(
parse_quote!(sock_release),
parse_quote!(
fn foo(ctx: SockContext) -> i32 {
0
}
),
)
.unwrap();
let expanded = prog.expand();
let expected = quote! {
#[no_mangle]
#[link_section = "cgroup/sock_release"]
fn foo(ctx: *mut ::aya_ebpf::bindings::bpf_sock) -> i32 {
return foo(::aya_ebpf::programs::SockContext::new(ctx));
fn foo(ctx: SockContext) -> i32 {
0
}
}
};
assert_eq!(expected.to_string(), expanded.to_string());
}
}