| // SPDX-License-Identifier: GPL-2.0 |
| |
| #include <linux/ptrace.h> |
| #include <linux/bpf.h> |
| |
| #include <netinet/in.h> |
| |
| #include <bpf/bpf_helpers.h> |
| #include <bpf/bpf_tracing.h> |
| |
| static struct sockaddr_in old; |
| |
| SEC("kprobe/__sys_connect") |
| int BPF_KPROBE(handle_sys_connect) |
| { |
| 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"; |
