| // 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"; |