kernelscript/tests/test_program_ref.ml at main · multikernel/kernelscript · GitHub

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* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

open Kernelscript.Parse

open Kernelscript.Type_checker

open Alcotest

(** Test program reference type checking *)

let test_program_reference_type () =

let program_text = {|

@xdp fn packet_filter(ctx: *xdp_md) -> xdp_action {

return 2

}

fn main() -> i32 {

var prog_handle = load(packet_filter)

var result = attach(prog_handle, "eth0", 0)

return 0

}

|} in

try

let ast = parse_string program_text in

let _ = Kernelscript.Symbol_table.build_symbol_table ast in

let (typed_ast, _) = Kernelscript.Type_checker.type_check_and_annotate_ast ast in

check bool "program reference type checking" true (List.length typed_ast > 0)

with

| e -> fail ("program reference type checking failed: " ^ Printexc.to_string e)

(** Test program reference with different program types *)

let test_different_program_types () =

let program_text = {|

@probe("sys_read") fn kprobe_tracer(fd: u32, buf: *u8, count: size_t) -> i32 {

return 0

}

@tc("ingress") fn tc_filter(ctx: *__sk_buff) -> i32 {

return 0

}

fn main() -> i32 {

var kprobe_handle = load(kprobe_tracer)

var tc_handle = load(tc_filter)

var kprobe_result = attach(kprobe_handle, "sys_read", 0)

var tc_result = attach(tc_handle, "eth0", 1)

return 0

}

|} in

try

let ast = parse_string program_text in

let _ = Kernelscript.Symbol_table.build_symbol_table ast in

let (typed_ast, _) = Kernelscript.Type_checker.type_check_and_annotate_ast ast in

check bool "different program types" true (List.length typed_ast > 0)

with

| e -> fail ("different program types failed: " ^ Printexc.to_string e)

(** Test invalid program reference *)

let test_invalid_program_reference () =

let program_text = {|

fn main() -> i32 {

var prog_handle = load(non_existent_program)

return 0

}

|} in

try

let ast = parse_string program_text in

let _ = Kernelscript.Symbol_table.build_symbol_table ast in

let (_, _) = Kernelscript.Type_checker.type_check_and_annotate_ast ast in

fail "should fail for non-existent program"

with

| Type_error _ -> ()

| Kernelscript.Symbol_table.Symbol_error _ -> ()

| e -> fail ("Expected Type_error or Symbol_error, got: " ^ Printexc.to_string e)

(** Test program reference as variable *)

let test_program_reference_as_variable () =

let program_text = {|

@xdp fn my_xdp(ctx: *xdp_md) -> xdp_action {

return 2

}

fn main() -> i32 {

var prog_ref = my_xdp // Should work - program reference as variable

var prog_handle = load(prog_ref)

return 0

}

|} in

try

let ast = parse_string program_text in

let _ = Kernelscript.Symbol_table.build_symbol_table ast in

let (typed_ast, _) = Kernelscript.Type_checker.type_check_and_annotate_ast ast in

check bool "program reference as variable" true (List.length typed_ast > 0)

with

| e -> fail ("program reference as variable failed: " ^ Printexc.to_string e)

(** Test wrong argument types for program functions *)

let test_wrong_argument_types () =

let program_text = {|

@xdp fn my_xdp(ctx: *xdp_md) -> xdp_action {

return 2

}

fn main() -> i32 {

var prog_handle = load("string_instead_of_program") // Should fail

return 0

}

|} in

try

let ast = parse_string program_text in

let _ = Kernelscript.Symbol_table.build_symbol_table ast in

let (_, _) = Kernelscript.Type_checker.type_check_and_annotate_ast ast in

fail "should fail for wrong argument type"

with

| Type_error _ -> ()

| e -> fail ("Expected Type_error, got: " ^ Printexc.to_string e)

(** Test stdlib integration *)

let test_stdlib_integration () =

(* Test that the built-in functions are properly recognized *)

check bool "load is builtin" true (Kernelscript.Stdlib.is_builtin_function "load");

check bool "attach is builtin" true (Kernelscript.Stdlib.is_builtin_function "attach");

(* Test getting function signatures *)

(match Kernelscript.Stdlib.get_builtin_function_signature "load" with

| Some (params, return_type) ->

check int "load parameter count" 1 (List.length params);

check bool "load return type is ProgramHandle" true (return_type = Kernelscript.Ast.ProgramHandle)

| None -> check bool "load function signature should exist" false true);

(match Kernelscript.Stdlib.get_builtin_function_signature "attach" with

| Some (params, return_type) ->

(* attach uses custom validation (param_types = []), so count is 0 *)

check int "attach parameter count" 0 (List.length params);

check bool "attach return type is U32" true (return_type = Kernelscript.Ast.U32)

| None -> check bool "attach function signature should exist" false true);

(match Kernelscript.Stdlib.get_builtin_function_signature "read" with

| Some (params, return_type) ->

check int "read parameter count" 0 (List.length params);

check bool "read return type is perf_read" true (return_type = Kernelscript.Ast.Struct "perf_read")

| None -> check bool "read function signature should exist" false true);

(* Verify that the custom validation function is wired up on the attach entry *)

(match Kernelscript.Stdlib.get_builtin_function "attach" with

| Some func ->

check bool "attach has custom validation wired up" true

(match func.validate with Some _ -> true | None -> false)

| None -> check bool "attach builtin should exist" false true)

(** Test perf attach returns an attachment value that can be read/detached. *)

let test_perf_attachment_value_flow () =

let program_text = {|

@perf_event fn on_cache_miss(ctx: *bpf_perf_event_data) -> i32 {

return 0

}

fn main() -> i32 {

var prog = load(on_cache_miss)

var att = attach(prog, perf_options {

event: cache_misses,

period: 1000000,

}, 0)

var snapshot = read(att)

var count = snapshot.scaled

detach(att)

print("count=%lld", count)

return 0

}

|} in

try

let ast = parse_string program_text in

let symbol_table =

Kernelscript.Symbol_table.build_symbol_table

~builtin_asts:[Kernelscript.Stdlib.get_builtin_types ()]

ast

let (typed_ast, _) = Kernelscript.Type_checker.type_check_and_annotate_ast ~symbol_table:(Some symbol_table) ast in

check bool "perf attachment value flow should type check" true (List.length typed_ast > 0)

with

| e -> fail ("perf attachment value flow failed: " ^ Printexc.to_string e)

(** Test that calling attach without load fails *)

let test_attach_without_load_fails () =

let program_text = {|

@xdp fn simple_xdp(ctx: *xdp_md) -> xdp_action {

return 2

}

fn main() -> i32 {

var result = attach(simple_xdp, "eth0", 0) // Should fail - program ref instead of handle

return 0

}

|} in

try

let ast = parse_string program_text in

let _ = Kernelscript.Symbol_table.build_symbol_table ast in

let (_, _) = Kernelscript.Type_checker.type_check_and_annotate_ast ast in

check bool "should fail when attach called with program reference" false true

with

| Type_error (msg, _) ->

check bool "should fail with type error" true (String.length msg > 0);

(* Error message is: "attach() requires (handle, target, flags) — ..." *)

check bool "error message starts with attach()" true

(String.length msg >= 8 && String.sub msg 0 8 = "attach()")

| _ ->

check bool "should fail when attach called with program reference" false true

(** Test multiple program handles with proper resource management *)

let test_multiple_program_handles () =

let program_text = {|

@xdp fn xdp_filter(ctx: *xdp_md) -> xdp_action {

return 2

}

@tc("ingress") fn tc_shaper(ctx: *__sk_buff) -> i32 {

return 0

}

fn main() -> i32 {

var xdp_handle = load(xdp_filter)

var tc_handle = load(tc_shaper)

var xdp_result = attach(xdp_handle, "eth0", 0)

var tc_result = attach(tc_handle, "eth0", 1)

return 0

}

|} in

try

let ast = parse_string program_text in

let _ = Kernelscript.Symbol_table.build_symbol_table ast in

let (typed_ast, _) = Kernelscript.Type_checker.type_check_and_annotate_ast ast in

check bool "multiple program handles should work" true (List.length typed_ast > 0)

with

| e -> fail ("multiple program handles failed: " ^ Printexc.to_string e)

(** Test that program handle variables can be named appropriately *)

let test_program_handle_naming () =

let program_text = {|

@xdp fn simple_xdp(ctx: *xdp_md) -> xdp_action {

return 2

}

fn main() -> i32 {

var program_handle = load(simple_xdp) // Clear, non-fd naming

var network_prog = load(simple_xdp) // Alternative naming

var result1 = attach(program_handle, "eth0", 0)

var result2 = attach(network_prog, "lo", 0)

return 0

}

|} in

try

let ast = parse_string program_text in

let _ = Kernelscript.Symbol_table.build_symbol_table ast in

let (typed_ast, _) = Kernelscript.Type_checker.type_check_and_annotate_ast ast in

check bool "program handle naming should work" true (List.length typed_ast > 0)

with

| e -> fail ("program handle naming failed: " ^ Printexc.to_string e)

(** Test suite *)

let program_ref_tests = [

"program_reference_type_checking", `Quick, test_program_reference_type;

"different_program_types", `Quick, test_different_program_types;

"invalid_program_reference", `Quick, test_invalid_program_reference;

"program_reference_as_variable", `Quick, test_program_reference_as_variable;

"wrong_argument_types", `Quick, test_wrong_argument_types;

"stdlib_integration", `Quick, test_stdlib_integration;

"attach_without_load_fails", `Quick, test_attach_without_load_fails;

"multiple_program_handles", `Quick, test_multiple_program_handles;

"program_handle_naming", `Quick, test_program_handle_naming;

"perf_attachment_value_flow", `Quick, test_perf_attachment_value_flow;

]

let () =

run "Program Reference Tests" [

"program_ref", program_ref_tests;

]

kernelscript/tests/test_program_ref.ml at main · multikernel/kernelscript · GitHub

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