blob: 1871e2ece0c40012cec4ea52b86a1fe8500d3ee5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/ptrace.h>
#include <linux/bpf.h>
#include <netinet/in.h>
#include "bpf_helpers.h"
#include "bpf_tracing.h"
static struct sockaddr_in old;
SEC("kprobe/__sys_connect")
int handle_sys_connect(struct pt_regs *ctx)
{
void *ptr = (void *)PT_REGS_PARM2(ctx);
struct sockaddr_in new;
bpf_probe_read_user(&old, sizeof(old), ptr);
__builtin_memset(&new, 0xab, sizeof(new));
bpf_probe_write_user(ptr, &new, sizeof(new));
return 0;
}
char _license[] SEC("license") = "GPL";
|