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/tracex5_user.c | 67 +++++++++++++++++++++++++++++----
1 files changed, 59 insertions(+), 8 deletions(-)
diff --git a/kernel/samples/bpf/tracex5_user.c b/kernel/samples/bpf/tracex5_user.c
index c4ab91c..c17d3fb 100644
--- a/kernel/samples/bpf/tracex5_user.c
+++ b/kernel/samples/bpf/tracex5_user.c
@@ -1,13 +1,20 @@
// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
-#include <linux/bpf.h>
+#include <stdlib.h>
#include <unistd.h>
#include <linux/filter.h>
#include <linux/seccomp.h>
#include <sys/prctl.h>
#include <bpf/bpf.h>
-#include "bpf_load.h"
+#include <bpf/libbpf.h>
#include <sys/resource.h>
+#include "trace_helpers.h"
+
+#ifdef __mips__
+#define MAX_ENTRIES 6000 /* MIPS n64 syscalls start at 5000 */
+#else
+#define MAX_ENTRIES 1024
+#endif
/* install fake seccomp program to enable seccomp code path inside the kernel,
* so that our kprobe attached to seccomp_phase1() can be triggered
@@ -27,16 +34,57 @@
int main(int ac, char **argv)
{
- FILE *f;
- char filename[256];
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+ struct bpf_link *link = NULL;
+ struct bpf_program *prog;
+ struct bpf_object *obj;
+ int key, fd, progs_fd;
+ const char *section;
+ char filename[256];
+ FILE *f;
- snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
setrlimit(RLIMIT_MEMLOCK, &r);
- if (load_bpf_file(filename)) {
- printf("%s", bpf_log_buf);
- 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;
+ }
+
+ 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;
+ }
+
+ link = bpf_program__attach(prog);
+ if (libbpf_get_error(link)) {
+ fprintf(stderr, "ERROR: bpf_program__attach failed\n");
+ link = NULL;
+ goto cleanup;
+ }
+
+ progs_fd = bpf_object__find_map_fd_by_name(obj, "progs");
+ if (progs_fd < 0) {
+ fprintf(stderr, "ERROR: finding a map in obj file failed\n");
+ goto cleanup;
+ }
+
+ bpf_object__for_each_program(prog, obj) {
+ section = bpf_program__section_name(prog);
+ /* register only syscalls to PROG_ARRAY */
+ if (sscanf(section, "kprobe/%d", &key) != 1)
+ continue;
+
+ fd = bpf_program__fd(prog);
+ bpf_map_update_elem(progs_fd, &key, &fd, BPF_ANY);
}
install_accept_all_seccomp();
@@ -46,5 +94,8 @@
read_trace_pipe();
+cleanup:
+ bpf_link__destroy(link);
+ bpf_object__close(obj);
return 0;
}
--
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