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/tracex2_user.c | 55 ++++++++++++++++++++++++++++++++++++++++++++-----------
1 files changed, 44 insertions(+), 11 deletions(-)
diff --git a/kernel/samples/bpf/tracex2_user.c b/kernel/samples/bpf/tracex2_user.c
index 1a81e6a..3d6eab7 100644
--- a/kernel/samples/bpf/tracex2_user.c
+++ b/kernel/samples/bpf/tracex2_user.c
@@ -3,16 +3,18 @@
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
-#include <linux/bpf.h>
#include <string.h>
#include <sys/resource.h>
#include <bpf/bpf.h>
-#include "bpf_load.h"
+#include <bpf/libbpf.h>
#include "bpf_util.h"
#define MAX_INDEX 64
#define MAX_STARS 38
+
+/* my_map, my_hist_map */
+static int map_fd[2];
static void stars(char *str, long val, long max, int width)
{
@@ -114,33 +116,59 @@
int main(int ac, char **argv)
{
- struct rlimit r = {1024*1024, RLIM_INFINITY};
- char filename[256];
+ struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
long key, next_key, value;
+ struct bpf_link *links[2];
+ struct bpf_program *prog;
+ struct bpf_object *obj;
+ char filename[256];
+ int i, j = 0;
FILE *f;
- int i;
-
- snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
perror("setrlimit(RLIMIT_MEMLOCK)");
return 1;
}
+ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+ obj = bpf_object__open_file(filename, NULL);
+ if (libbpf_get_error(obj)) {
+ fprintf(stderr, "ERROR: opening BPF object file failed\n");
+ return 0;
+ }
+
+ /* 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, "my_map");
+ map_fd[1] = bpf_object__find_map_fd_by_name(obj, "my_hist_map");
+ if (map_fd[0] < 0 || map_fd[1] < 0) {
+ fprintf(stderr, "ERROR: finding a map in obj file failed\n");
+ goto cleanup;
+ }
+
signal(SIGINT, int_exit);
signal(SIGTERM, int_exit);
/* start 'ping' in the background to have some kfree_skb events */
- f = popen("ping -c5 localhost", "r");
+ f = popen("ping -4 -c5 localhost", "r");
(void) f;
/* start 'dd' in the background to have plenty of 'write' syscalls */
f = popen("dd if=/dev/zero of=/dev/null count=5000000", "r");
(void) f;
- if (load_bpf_file(filename)) {
- printf("%s", bpf_log_buf);
- return 1;
+ bpf_object__for_each_program(prog, obj) {
+ links[j] = bpf_program__attach(prog);
+ if (libbpf_get_error(links[j])) {
+ fprintf(stderr, "ERROR: bpf_program__attach failed\n");
+ links[j] = NULL;
+ goto cleanup;
+ }
+ j++;
}
for (i = 0; i < 5; i++) {
@@ -156,5 +184,10 @@
}
print_hist(map_fd[1]);
+cleanup:
+ for (j--; j >= 0; j--)
+ bpf_link__destroy(links[j]);
+
+ bpf_object__close(obj);
return 0;
}
--
Gitblit v1.6.2