Commit 2222aa1c authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov
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selftests/bpf: Add selftests allowing cgroup prog pre-ordering 



Add a few selftests with cgroup prog pre-ordering.

Signed-off-by: default avatarYonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20250224230121.283601-1-yonghong.song@linux.dev


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 4b82b181

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

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// 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 cg_child, int sock_fd, bool all_preorder)

{

	LIBBPF_OPTS(bpf_prog_attach_opts, opts);

	enum bpf_attach_type prog_c_atype, prog_c2_atype, prog_p_atype, prog_p2_atype;

	int prog_c_fd, prog_c2_fd, 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;



	buf = 0x00;

	err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1);

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

		goto close_skel;



	opts.flags = BPF_F_ALLOW_MULTI;

	if (all_preorder)

		opts.flags |= BPF_F_PREORDER;

	prog = skel->progs.child;

	prog_c_fd = bpf_program__fd(prog);

	prog_c_atype = bpf_program__expected_attach_type(prog);

	err = bpf_prog_attach_opts(prog_c_fd, cg_child, prog_c_atype, &opts);

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

		goto close_skel;



	opts.flags = BPF_F_ALLOW_MULTI | BPF_F_PREORDER;

	prog = skel->progs.child_2;

	prog_c2_fd = bpf_program__fd(prog);

	prog_c2_atype = bpf_program__expected_attach_type(prog);

	err = bpf_prog_attach_opts(prog_c2_fd, cg_child, prog_c2_atype, &opts);

	if (!ASSERT_OK(err, "bpf_prog_attach_opts-child_2"))

		goto detach_child;



	optlen = 1;

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

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

		goto detach_child_2;



	result = skel->bss->result;

	if (all_preorder)

		ASSERT_TRUE(result[0] == 1 && result[1] == 2, "child only");

	else

		ASSERT_TRUE(result[0] == 2 && result[1] == 1, "child only");



	skel->bss->idx = 0;

	memset(result, 0, 4);



	opts.flags = BPF_F_ALLOW_MULTI;

	if (all_preorder)

		opts.flags |= BPF_F_PREORDER;

	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 detach_child_2;



	opts.flags = BPF_F_ALLOW_MULTI | BPF_F_PREORDER;

	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;



	if (all_preorder)

		ASSERT_TRUE(result[0] == 3 && result[1] == 4 && result[2] == 1 && result[3] == 2,

			    "parent and child");

	else

		ASSERT_TRUE(result[0] == 4 && result[1] == 2 && result[2] == 1 && result[3] == 3,

			    "parent and child");



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");

detach_child_2:

	ASSERT_OK(bpf_prog_detach2(prog_c2_fd, cg_child, prog_c2_atype),

		  "bpf_prog_detach2-child_2");

detach_child:

	ASSERT_OK(bpf_prog_detach2(prog_c_fd, cg_child, prog_c_atype),

		  "bpf_prog_detach2-child");

close_skel:

	cgroup_preorder__destroy(skel);

	return err;

}



void test_cgroup_preorder(void)

{

	int cg_parent = -1, cg_child = -1, sock_fd = -1;



	cg_parent = test__join_cgroup("/parent");

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

		goto out;



	cg_child = test__join_cgroup("/parent/child");

	if (!ASSERT_GE(cg_child, 0, "join_cgroup /parent/child"))

		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, cg_child, sock_fd, false), "getsockopt_test_1");

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



out:

	close(sock_fd);

	close(cg_child);

	close(cg_parent);

}

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

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// 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";



unsigned int idx;

__u8 result[4];



SEC("cgroup/getsockopt")

int child(struct bpf_sockopt *ctx)

{

	if (idx < 4)

		result[idx++] = 1;

	return 1;

}



SEC("cgroup/getsockopt")

int child_2(struct bpf_sockopt *ctx)

{

	if (idx < 4)

		result[idx++] = 2;

	return 1;

}



SEC("cgroup/getsockopt")

int parent(struct bpf_sockopt *ctx)

{

	if (idx < 4)

		result[idx++] = 3;

	return 1;

}



SEC("cgroup/getsockopt")

int parent_2(struct bpf_sockopt *ctx)

{

	if (idx < 4)

		result[idx++] = 4;

	return 1;

}