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