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[216] Add Support For Flow Dissector Programs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| use proc_macro2::TokenStream; | ||
| use proc_macro_error::abort; | ||
| use quote::quote; | ||
| use syn::{ItemFn, Result}; | ||
|
|
||
| pub(crate) struct FlowDissector { | ||
| item: ItemFn, | ||
| } | ||
|
|
||
| impl FlowDissector { | ||
| pub(crate) fn parse(attrs: TokenStream, item: TokenStream) -> Result<Self> { | ||
| if !attrs.is_empty() { | ||
| abort!(attrs, "unexpected attribute") | ||
| } | ||
| let item = syn::parse2(item)?; | ||
| Ok(FlowDissector { item }) | ||
| } | ||
|
|
||
| pub(crate) fn expand(&self) -> Result<TokenStream> { | ||
| let fn_name = self.item.sig.ident.clone(); | ||
| let fn_vis = &self.item.vis; | ||
| let item = &self.item; | ||
| Ok(quote! { | ||
| #[no_mangle] | ||
| #[link_section = "flow_dissector"] | ||
| #fn_vis fn #fn_name(ctx: *mut ::aya_bpf::bindings::__sk_buff) -> u32 { | ||
| return #fn_name(::aya_bpf::programs::FlowDissectorContext::new(ctx)); | ||
|
|
||
| #item | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
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| #[cfg(test)] | ||
| mod tests { | ||
| use syn::parse_quote; | ||
|
|
||
| use super::*; | ||
|
|
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| #[test] | ||
| fn test_flow_dissector() { | ||
| let prog = FlowDissector::parse( | ||
| parse_quote! {}, | ||
| parse_quote! { | ||
| fn prog(ctx: &mut ::aya_bpf::programs::FlowDissectorContext) -> u32 { | ||
| 0 | ||
| } | ||
| }, | ||
| ) | ||
| .unwrap(); | ||
| let expanded = prog.expand().unwrap(); | ||
| let expected = quote! { | ||
| #[no_mangle] | ||
| #[link_section = "flow_dissector"] | ||
| fn prog(ctx: *mut ::aya_bpf::bindings::__sk_buff) -> u32 { | ||
| return prog(::aya_bpf::programs::FlowDissectorContext::new(ctx)); | ||
|
|
||
| fn prog(ctx: &mut ::aya_bpf::programs::FlowDissectorContext) -> u32 { | ||
| 0 | ||
| } | ||
| } | ||
| }; | ||
| assert_eq!(expected.to_string(), expanded.to_string()); | ||
| } | ||
| } |
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