From 05e59e5fb0064c97a1c10921ecd549f2d4a58565 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 09 Oct 2024 06:14:40 +0000
Subject: [PATCH] add REDIRECT
---
kernel/samples/bpf/test_current_task_under_cgroup_user.c | 60 ++++++++++++++++++++++++++++++++++++++++++++----------------
1 files changed, 44 insertions(+), 16 deletions(-)
diff --git a/kernel/samples/bpf/test_current_task_under_cgroup_user.c b/kernel/samples/bpf/test_current_task_under_cgroup_user.c
index 4be4874..ac251a4 100644
--- a/kernel/samples/bpf/test_current_task_under_cgroup_user.c
+++ b/kernel/samples/bpf/test_current_task_under_cgroup_user.c
@@ -1,17 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2016 Sargun Dhillon <sargun@sargun.me>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
*/
#define _GNU_SOURCE
#include <stdio.h>
-#include <linux/bpf.h>
#include <unistd.h>
#include <bpf/bpf.h>
-#include "bpf_load.h"
-#include <linux/bpf.h>
+#include <bpf/libbpf.h>
#include "cgroup_helpers.h"
#define CGROUP_PATH "/my-cgroup"
@@ -19,13 +14,44 @@
int main(int argc, char **argv)
{
pid_t remote_pid, local_pid = getpid();
- int cg2, idx = 0, rc = 0;
+ struct bpf_link *link = NULL;
+ struct bpf_program *prog;
+ int cg2, idx = 0, rc = 1;
+ struct bpf_object *obj;
char filename[256];
+ int map_fd[2];
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
- if (load_bpf_file(filename)) {
- printf("%s", bpf_log_buf);
- return 1;
+ obj = bpf_object__open_file(filename, NULL);
+ if (libbpf_get_error(obj)) {
+ fprintf(stderr, "ERROR: opening BPF object file failed\n");
+ return 0;
+ }
+
+ prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
+ if (!prog) {
+ printf("finding a prog in obj file failed\n");
+ goto cleanup;
+ }
+
+ /* load BPF program */
+ if (bpf_object__load(obj)) {
+ fprintf(stderr, "ERROR: loading BPF object file failed\n");
+ goto cleanup;
+ }
+
+ map_fd[0] = bpf_object__find_map_fd_by_name(obj, "cgroup_map");
+ map_fd[1] = bpf_object__find_map_fd_by_name(obj, "perf_map");
+ if (map_fd[0] < 0 || map_fd[1] < 0) {
+ fprintf(stderr, "ERROR: finding a map in obj file failed\n");
+ goto cleanup;
+ }
+
+ link = bpf_program__attach(prog);
+ if (libbpf_get_error(link)) {
+ fprintf(stderr, "ERROR: bpf_program__attach failed\n");
+ link = NULL;
+ goto cleanup;
}
if (setup_cgroup_environment())
@@ -33,7 +59,7 @@
cg2 = create_and_get_cgroup(CGROUP_PATH);
- if (!cg2)
+ if (cg2 < 0)
goto err;
if (bpf_map_update_elem(map_fd[0], &idx, &cg2, BPF_ANY)) {
@@ -74,12 +100,14 @@
goto err;
}
- goto out;
-err:
- rc = 1;
+ rc = 0;
-out:
+err:
close(cg2);
cleanup_cgroup_environment();
+
+cleanup:
+ bpf_link__destroy(link);
+ bpf_object__close(obj);
return rc;
}
--
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