Commit e422d5f1 authored by Yonghong Song's avatar Yonghong Song Committed by Andrii Nakryiko
Browse files

selftests/bpf: Add two selftests for mprog API based cgroup progs 

Two tests are added:
  - cgroup_mprog_opts, which mimics tc_opts.c ([1]). Both prog and link
    attach are tested. Some negative tests are also included.
  - cgroup_mprog_ordering, which actually runs the program with some mprog
    API flags.

  [1] https://github.com/torvalds/linux/blob/master/tools/testing/selftests/bpf/prog_tests/tc_opts.c



Signed-off-by: default avatarYonghong Song <yonghong.song@linux.dev>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250606163156.2429955-1-yonghong.song@linux.dev
parent c1bb6865

tools/testing/selftests/bpf/prog_tests/cgroup_mprog_opts.c

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+617 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */

#include <test_progs.h>

#include "cgroup_helpers.h"

#include "cgroup_mprog.skel.h"



static void assert_mprog_count(int cg, int atype, int expected)

{

	__u32 count = 0, attach_flags = 0;

	int err;



	err = bpf_prog_query(cg, atype, 0, &attach_flags,

			     NULL, &count);

	ASSERT_EQ(count, expected, "count");

	ASSERT_EQ(err, 0, "prog_query");

}



static void test_prog_attach_detach(int atype)

{

	LIBBPF_OPTS(bpf_prog_attach_opts, opta);

	LIBBPF_OPTS(bpf_prog_detach_opts, optd);

	LIBBPF_OPTS(bpf_prog_query_opts, optq);

	__u32 fd1, fd2, fd3, fd4, id1, id2, id3, id4;

	struct cgroup_mprog *skel;

	__u32 prog_ids[10];

	int cg, err;



	cg = test__join_cgroup("/prog_attach_detach");

	if (!ASSERT_GE(cg, 0, "join_cgroup /prog_attach_detach"))

		return;



	skel = cgroup_mprog__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel_load"))

		goto cleanup;



	fd1 = bpf_program__fd(skel->progs.getsockopt_1);

	fd2 = bpf_program__fd(skel->progs.getsockopt_2);

	fd3 = bpf_program__fd(skel->progs.getsockopt_3);

	fd4 = bpf_program__fd(skel->progs.getsockopt_4);



	id1 = id_from_prog_fd(fd1);

	id2 = id_from_prog_fd(fd2);

	id3 = id_from_prog_fd(fd3);

	id4 = id_from_prog_fd(fd4);



	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_BEFORE | BPF_F_AFTER,

		.expected_revision = 1,

	);



	/* ordering: [fd1] */

	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	if (!ASSERT_EQ(err, 0, "prog_attach"))

		goto cleanup;



	assert_mprog_count(cg, atype, 1);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_BEFORE,

		.expected_revision = 2,

	);



	/* ordering: [fd2, fd1] */

	err = bpf_prog_attach_opts(fd2, cg, atype, &opta);

	if (!ASSERT_EQ(err, 0, "prog_attach"))

		goto cleanup1;



	assert_mprog_count(cg, atype, 2);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_AFTER,

		.relative_fd = fd2,

		.expected_revision = 3,

	);



	/* ordering: [fd2, fd3, fd1] */

	err = bpf_prog_attach_opts(fd3, cg, atype, &opta);

	if (!ASSERT_EQ(err, 0, "prog_attach"))

		goto cleanup2;



	assert_mprog_count(cg, atype, 3);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI,

		.expected_revision = 4,

	);



	/* ordering: [fd2, fd3, fd1, fd4] */

	err = bpf_prog_attach_opts(fd4, cg, atype, &opta);

	if (!ASSERT_EQ(err, 0, "prog_attach"))

		goto cleanup3;



	assert_mprog_count(cg, atype, 4);



	/* retrieve optq.prog_cnt */

	err = bpf_prog_query_opts(cg, atype, &optq);

	if (!ASSERT_OK(err, "prog_query"))

		goto cleanup4;



	/* optq.prog_cnt will be used in below query */

	memset(prog_ids, 0, sizeof(prog_ids));

	optq.prog_ids = prog_ids;

	err = bpf_prog_query_opts(cg, atype, &optq);

	if (!ASSERT_OK(err, "prog_query"))

		goto cleanup4;



	ASSERT_EQ(optq.count, 4, "count");

	ASSERT_EQ(optq.revision, 5, "revision");

	ASSERT_EQ(optq.prog_ids[0], id2, "prog_ids[0]");

	ASSERT_EQ(optq.prog_ids[1], id3, "prog_ids[1]");

	ASSERT_EQ(optq.prog_ids[2], id1, "prog_ids[2]");

	ASSERT_EQ(optq.prog_ids[3], id4, "prog_ids[3]");

	ASSERT_EQ(optq.prog_ids[4], 0, "prog_ids[4]");

	ASSERT_EQ(optq.link_ids, NULL, "link_ids");



cleanup4:

	optd.expected_revision = 5;

	err = bpf_prog_detach_opts(fd4, cg, atype, &optd);

	ASSERT_OK(err, "prog_detach");

	assert_mprog_count(cg, atype, 3);



cleanup3:

	LIBBPF_OPTS_RESET(optd);

	err = bpf_prog_detach_opts(fd3, cg, atype, &optd);

	ASSERT_OK(err, "prog_detach");

	assert_mprog_count(cg, atype, 2);



	/* Check revision after two detach operations */

	err = bpf_prog_query_opts(cg, atype, &optq);

	ASSERT_OK(err, "prog_query");

	ASSERT_EQ(optq.revision, 7, "revision");



cleanup2:

	err = bpf_prog_detach_opts(fd2, cg, atype, &optd);

	ASSERT_OK(err, "prog_detach");

	assert_mprog_count(cg, atype, 1);



cleanup1:

	err = bpf_prog_detach_opts(fd1, cg, atype, &optd);

	ASSERT_OK(err, "prog_detach");

	assert_mprog_count(cg, atype, 0);



cleanup:

	cgroup_mprog__destroy(skel);

	close(cg);

}



static void test_link_attach_detach(int atype)

{

	LIBBPF_OPTS(bpf_cgroup_opts, opta);

	LIBBPF_OPTS(bpf_cgroup_opts, optd);

	LIBBPF_OPTS(bpf_prog_query_opts, optq);

	struct bpf_link *link1, *link2, *link3, *link4;

	__u32 fd1, fd2, fd3, fd4, id1, id2, id3, id4;

	struct cgroup_mprog *skel;

	__u32 prog_ids[10];

	int cg, err;



	cg = test__join_cgroup("/link_attach_detach");

	if (!ASSERT_GE(cg, 0, "join_cgroup /link_attach_detach"))

		return;



	skel = cgroup_mprog__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel_load"))

		goto cleanup;



	fd1 = bpf_program__fd(skel->progs.getsockopt_1);

	fd2 = bpf_program__fd(skel->progs.getsockopt_2);

	fd3 = bpf_program__fd(skel->progs.getsockopt_3);

	fd4 = bpf_program__fd(skel->progs.getsockopt_4);



	id1 = id_from_prog_fd(fd1);

	id2 = id_from_prog_fd(fd2);

	id3 = id_from_prog_fd(fd3);

	id4 = id_from_prog_fd(fd4);



	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.expected_revision = 1,

	);



	/* ordering: [fd1] */

	link1 = bpf_program__attach_cgroup_opts(skel->progs.getsockopt_1, cg, &opta);

	if (!ASSERT_OK_PTR(link1, "link_attach"))

		goto cleanup;



	assert_mprog_count(cg, atype, 1);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_BEFORE | BPF_F_LINK,

		.relative_id = id_from_link_fd(bpf_link__fd(link1)),

		.expected_revision = 2,

	);



	/* ordering: [fd2, fd1] */

	link2 = bpf_program__attach_cgroup_opts(skel->progs.getsockopt_2, cg, &opta);

	if (!ASSERT_OK_PTR(link2, "link_attach"))

		goto cleanup1;



	assert_mprog_count(cg, atype, 2);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_AFTER | BPF_F_LINK,

		.relative_fd = bpf_link__fd(link2),

		.expected_revision = 3,

	);



	/* ordering: [fd2, fd3, fd1] */

	link3 = bpf_program__attach_cgroup_opts(skel->progs.getsockopt_3, cg, &opta);

	if (!ASSERT_OK_PTR(link3, "link_attach"))

		goto cleanup2;



	assert_mprog_count(cg, atype, 3);



	LIBBPF_OPTS_RESET(opta,

		.expected_revision = 4,

	);



	/* ordering: [fd2, fd3, fd1, fd4] */

	link4 = bpf_program__attach_cgroup_opts(skel->progs.getsockopt_4, cg, &opta);

	if (!ASSERT_OK_PTR(link4, "link_attach"))

		goto cleanup3;



	assert_mprog_count(cg, atype, 4);



	/* retrieve optq.prog_cnt */

	err = bpf_prog_query_opts(cg, atype, &optq);

	if (!ASSERT_OK(err, "prog_query"))

		goto cleanup4;



	/* optq.prog_cnt will be used in below query */

	memset(prog_ids, 0, sizeof(prog_ids));

	optq.prog_ids = prog_ids;

	err = bpf_prog_query_opts(cg, atype, &optq);

	if (!ASSERT_OK(err, "prog_query"))

		goto cleanup4;



	ASSERT_EQ(optq.count, 4, "count");

	ASSERT_EQ(optq.revision, 5, "revision");

	ASSERT_EQ(optq.prog_ids[0], id2, "prog_ids[0]");

	ASSERT_EQ(optq.prog_ids[1], id3, "prog_ids[1]");

	ASSERT_EQ(optq.prog_ids[2], id1, "prog_ids[2]");

	ASSERT_EQ(optq.prog_ids[3], id4, "prog_ids[3]");

	ASSERT_EQ(optq.prog_ids[4], 0, "prog_ids[4]");

	ASSERT_EQ(optq.link_ids, NULL, "link_ids");



cleanup4:

	bpf_link__destroy(link4);

	assert_mprog_count(cg, atype, 3);



cleanup3:

	bpf_link__destroy(link3);

	assert_mprog_count(cg, atype, 2);



	/* Check revision after two detach operations */

	err = bpf_prog_query_opts(cg, atype, &optq);

	ASSERT_OK(err, "prog_query");

	ASSERT_EQ(optq.revision, 7, "revision");



cleanup2:

	bpf_link__destroy(link2);

	assert_mprog_count(cg, atype, 1);



cleanup1:

	bpf_link__destroy(link1);

	assert_mprog_count(cg, atype, 0);



cleanup:

	cgroup_mprog__destroy(skel);

	close(cg);

}



static void test_preorder_prog_attach_detach(int atype)

{

	LIBBPF_OPTS(bpf_prog_attach_opts, opta);

	LIBBPF_OPTS(bpf_prog_detach_opts, optd);

	__u32 fd1, fd2, fd3, fd4;

	struct cgroup_mprog *skel;

	int cg, err;



	cg = test__join_cgroup("/preorder_prog_attach_detach");

	if (!ASSERT_GE(cg, 0, "join_cgroup /preorder_prog_attach_detach"))

		return;



	skel = cgroup_mprog__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel_load"))

		goto cleanup;



	fd1 = bpf_program__fd(skel->progs.getsockopt_1);

	fd2 = bpf_program__fd(skel->progs.getsockopt_2);

	fd3 = bpf_program__fd(skel->progs.getsockopt_3);

	fd4 = bpf_program__fd(skel->progs.getsockopt_4);



	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI,

		.expected_revision = 1,

	);



	/* ordering: [fd1] */

	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	if (!ASSERT_EQ(err, 0, "prog_attach"))

		goto cleanup;



	assert_mprog_count(cg, atype, 1);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_PREORDER,

		.expected_revision = 2,

	);



	/* ordering: [fd1, fd2] */

	err = bpf_prog_attach_opts(fd2, cg, atype, &opta);

	if (!ASSERT_EQ(err, 0, "prog_attach"))

		goto cleanup1;



	assert_mprog_count(cg, atype, 2);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_AFTER,

		.relative_fd = fd2,

		.expected_revision = 3,

	);



	err = bpf_prog_attach_opts(fd3, cg, atype, &opta);

	if (!ASSERT_EQ(err, -EINVAL, "prog_attach"))

		goto cleanup2;



	assert_mprog_count(cg, atype, 2);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_AFTER | BPF_F_PREORDER,

		.relative_fd = fd2,

		.expected_revision = 3,

	);



	/* ordering: [fd1, fd2, fd3] */

	err = bpf_prog_attach_opts(fd3, cg, atype, &opta);

	if (!ASSERT_EQ(err, 0, "prog_attach"))

		goto cleanup2;



	assert_mprog_count(cg, atype, 3);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI,

		.expected_revision = 4,

	);



	/* ordering: [fd2, fd3, fd1, fd4] */

	err = bpf_prog_attach_opts(fd4, cg, atype, &opta);

	if (!ASSERT_EQ(err, 0, "prog_attach"))

		goto cleanup3;



	assert_mprog_count(cg, atype, 4);



	err = bpf_prog_detach_opts(fd4, cg, atype, &optd);

	ASSERT_OK(err, "prog_detach");

	assert_mprog_count(cg, atype, 3);



cleanup3:

	err = bpf_prog_detach_opts(fd3, cg, atype, &optd);

	ASSERT_OK(err, "prog_detach");

	assert_mprog_count(cg, atype, 2);



cleanup2:

	err = bpf_prog_detach_opts(fd2, cg, atype, &optd);

	ASSERT_OK(err, "prog_detach");

	assert_mprog_count(cg, atype, 1);



cleanup1:

	err = bpf_prog_detach_opts(fd1, cg, atype, &optd);

	ASSERT_OK(err, "prog_detach");

	assert_mprog_count(cg, atype, 0);



cleanup:

	cgroup_mprog__destroy(skel);

	close(cg);

}



static void test_preorder_link_attach_detach(int atype)

{

	LIBBPF_OPTS(bpf_cgroup_opts, opta);

	struct bpf_link *link1, *link2, *link3, *link4;

	struct cgroup_mprog *skel;

	__u32 fd2;

	int cg;



	cg = test__join_cgroup("/preorder_link_attach_detach");

	if (!ASSERT_GE(cg, 0, "join_cgroup /preorder_link_attach_detach"))

		return;



	skel = cgroup_mprog__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel_load"))

		goto cleanup;



	fd2 = bpf_program__fd(skel->progs.getsockopt_2);



	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.expected_revision = 1,

	);



	/* ordering: [fd1] */

	link1 = bpf_program__attach_cgroup_opts(skel->progs.getsockopt_1, cg, &opta);

	if (!ASSERT_OK_PTR(link1, "link_attach"))

		goto cleanup;



	assert_mprog_count(cg, atype, 1);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_PREORDER,

		.expected_revision = 2,

	);



	/* ordering: [fd1, fd2] */

	link2 = bpf_program__attach_cgroup_opts(skel->progs.getsockopt_2, cg, &opta);

	if (!ASSERT_OK_PTR(link2, "link_attach"))

		goto cleanup1;



	assert_mprog_count(cg, atype, 2);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_AFTER,

		.relative_fd = fd2,

		.expected_revision = 3,

	);



	link3 = bpf_program__attach_cgroup_opts(skel->progs.getsockopt_3, cg, &opta);

	if (!ASSERT_ERR_PTR(link3, "link_attach"))

		goto cleanup2;



	assert_mprog_count(cg, atype, 2);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_AFTER | BPF_F_PREORDER | BPF_F_LINK,

		.relative_fd = bpf_link__fd(link2),

		.expected_revision = 3,

	);



	/* ordering: [fd1, fd2, fd3] */

	link3 = bpf_program__attach_cgroup_opts(skel->progs.getsockopt_3, cg, &opta);

	if (!ASSERT_OK_PTR(link3, "link_attach"))

		goto cleanup2;



	assert_mprog_count(cg, atype, 3);



	LIBBPF_OPTS_RESET(opta,

		.expected_revision = 4,

	);



	/* ordering: [fd2, fd3, fd1, fd4] */

	link4 = bpf_program__attach_cgroup_opts(skel->progs.getsockopt_4, cg, &opta);

	if (!ASSERT_OK_PTR(link4, "prog_attach"))

		goto cleanup3;



	assert_mprog_count(cg, atype, 4);



	bpf_link__destroy(link4);

	assert_mprog_count(cg, atype, 3);



cleanup3:

	bpf_link__destroy(link3);

	assert_mprog_count(cg, atype, 2);



cleanup2:

	bpf_link__destroy(link2);

	assert_mprog_count(cg, atype, 1);



cleanup1:

	bpf_link__destroy(link1);

	assert_mprog_count(cg, atype, 0);



cleanup:

	cgroup_mprog__destroy(skel);

	close(cg);

}



static void test_invalid_attach_detach(int atype)

{

	LIBBPF_OPTS(bpf_prog_attach_opts, opta);

	__u32 fd1, fd2, id2;

	struct cgroup_mprog *skel;

	int cg, err;



	cg = test__join_cgroup("/invalid_attach_detach");

	if (!ASSERT_GE(cg, 0, "join_cgroup /invalid_attach_detach"))

		return;



	skel = cgroup_mprog__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel_load"))

		goto cleanup;



	fd1 = bpf_program__fd(skel->progs.getsockopt_1);

	fd2 = bpf_program__fd(skel->progs.getsockopt_2);



	id2 = id_from_prog_fd(fd2);



	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_BEFORE | BPF_F_AFTER,

		.relative_id = id2,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -EINVAL, "prog_attach");

	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_BEFORE | BPF_F_ID,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -ENOENT, "prog_attach");

	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_AFTER | BPF_F_ID,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -ENOENT, "prog_attach");

	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_BEFORE | BPF_F_AFTER,

		.relative_id = id2,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -EINVAL, "prog_attach");

	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_LINK,

		.relative_id = id2,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -EINVAL, "prog_attach");

	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI,

		.relative_id = id2,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -EINVAL, "prog_attach");

	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_BEFORE,

		.relative_fd = fd1,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -ENOENT, "prog_attach");

	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_AFTER,

		.relative_fd = fd1,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -ENOENT, "prog_attach");

	assert_mprog_count(cg, atype, 0);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	if (!ASSERT_EQ(err, 0, "prog_attach"))

		goto cleanup;

	assert_mprog_count(cg, atype, 1);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_AFTER,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -EINVAL, "prog_attach");

	assert_mprog_count(cg, atype, 1);



	LIBBPF_OPTS_RESET(opta,

		.flags = BPF_F_ALLOW_MULTI | BPF_F_REPLACE | BPF_F_AFTER,

		.replace_prog_fd = fd1,

	);



	err = bpf_prog_attach_opts(fd1, cg, atype, &opta);

	ASSERT_EQ(err, -EINVAL, "prog_attach");

	assert_mprog_count(cg, atype, 1);

cleanup:

	cgroup_mprog__destroy(skel);

	close(cg);

}



void test_cgroup_mprog_opts(void)

{

	if (test__start_subtest("prog_attach_detach"))

		test_prog_attach_detach(BPF_CGROUP_GETSOCKOPT);

	if (test__start_subtest("link_attach_detach"))

		test_link_attach_detach(BPF_CGROUP_GETSOCKOPT);

	if (test__start_subtest("preorder_prog_attach_detach"))

		test_preorder_prog_attach_detach(BPF_CGROUP_GETSOCKOPT);

	if (test__start_subtest("preorder_link_attach_detach"))

		test_preorder_link_attach_detach(BPF_CGROUP_GETSOCKOPT);

	if (test__start_subtest("invalid_attach_detach"))

		test_invalid_attach_detach(BPF_CGROUP_GETSOCKOPT);

}

tools/testing/selftests/bpf/prog_tests/cgroup_mprog_ordering.c

0 → 100644
+77 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */

#include <test_progs.h>

#include "cgroup_helpers.h"

#include "cgroup_preorder.skel.h"



static int run_getsockopt_test(int cg_parent, int sock_fd, bool has_relative_fd)

{

	LIBBPF_OPTS(bpf_prog_attach_opts, opts);

	enum bpf_attach_type prog_p_atype, prog_p2_atype;

	int prog_p_fd, prog_p2_fd;

	struct cgroup_preorder *skel = NULL;

	struct bpf_program *prog;

	__u8 *result, buf;

	socklen_t optlen;

	int err = 0;



	skel = cgroup_preorder__open_and_load();

	if (!ASSERT_OK_PTR(skel, "cgroup_preorder__open_and_load"))

		return 0;



	LIBBPF_OPTS_RESET(opts);

	opts.flags = BPF_F_ALLOW_MULTI;

	prog = skel->progs.parent;

	prog_p_fd = bpf_program__fd(prog);

	prog_p_atype = bpf_program__expected_attach_type(prog);

	err = bpf_prog_attach_opts(prog_p_fd, cg_parent, prog_p_atype, &opts);

	if (!ASSERT_OK(err, "bpf_prog_attach_opts-parent"))

		goto close_skel;



	opts.flags = BPF_F_ALLOW_MULTI | BPF_F_BEFORE;

	if (has_relative_fd)

		opts.relative_fd = prog_p_fd;

	prog = skel->progs.parent_2;

	prog_p2_fd = bpf_program__fd(prog);

	prog_p2_atype = bpf_program__expected_attach_type(prog);

	err = bpf_prog_attach_opts(prog_p2_fd, cg_parent, prog_p2_atype, &opts);

	if (!ASSERT_OK(err, "bpf_prog_attach_opts-parent_2"))

		goto detach_parent;



	err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);

	if (!ASSERT_OK(err, "getsockopt"))

		goto detach_parent_2;



	result = skel->bss->result;

	ASSERT_TRUE(result[0] == 4 && result[1] == 3, "result values");



detach_parent_2:

	ASSERT_OK(bpf_prog_detach2(prog_p2_fd, cg_parent, prog_p2_atype),

		  "bpf_prog_detach2-parent_2");

detach_parent:

	ASSERT_OK(bpf_prog_detach2(prog_p_fd, cg_parent, prog_p_atype),

		  "bpf_prog_detach2-parent");

close_skel:

	cgroup_preorder__destroy(skel);

	return err;

}



void test_cgroup_mprog_ordering(void)

{

	int cg_parent = -1, sock_fd = -1;



	cg_parent = test__join_cgroup("/parent");

	if (!ASSERT_GE(cg_parent, 0, "join_cgroup /parent"))

		goto out;



	sock_fd = socket(AF_INET, SOCK_STREAM, 0);

	if (!ASSERT_GE(sock_fd, 0, "socket"))

		goto out;



	ASSERT_OK(run_getsockopt_test(cg_parent, sock_fd, false), "getsockopt_test_1");

	ASSERT_OK(run_getsockopt_test(cg_parent, sock_fd, true), "getsockopt_test_2");



out:

	close(sock_fd);

	close(cg_parent);

}

tools/testing/selftests/bpf/progs/cgroup_mprog.c

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Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */

#include <vmlinux.h>

#include <bpf/bpf_helpers.h>



char _license[] SEC("license") = "GPL";



SEC("cgroup/getsockopt")

int getsockopt_1(struct bpf_sockopt *ctx)

{

	return 1;

}



SEC("cgroup/getsockopt")

int getsockopt_2(struct bpf_sockopt *ctx)

{

	return 1;

}



SEC("cgroup/getsockopt")

int getsockopt_3(struct bpf_sockopt *ctx)

{

	return 1;

}



SEC("cgroup/getsockopt")

int getsockopt_4(struct bpf_sockopt *ctx)

{

	return 1;

}