使用 bpf 实现了以下功能：
- 客户端将发送到指定地址的 udp 数据包加上 icmp echo request 的 header ，伪造为 icmp 数据包
- 服务端收到 icmp 数据包后，移除 icmp header ，并将对应 udp 数据包发送到本机对应的 udp 端口
- 服务端向客户端回复数据包时，也需要按照同样的规则加上 icmp header ，但是返回的 icmp 数据包需要是 echo reply
- 为了尽可能伪装成 icmp 数据包，客户端和服务端都记录了对应地址的 icmp 序列号，每次发送时均加一
计划实现的功能：
- 对 icmp body 进行加密，防止被检测到
# archlinux
cd pack
makepkg
# other linux
make# modify args
vim /etc/default/udp2icmp
# start service
systemctl start udp2icmp.service详细参数：
Usage: udp2icmp [options]
Description:
Wrap udp packet with icmp header using bpf.
Options:
-h, --help Print help message.
-t, --target <ip:port> Target address. Set multiple targets with multiple --target options.
NOTE: This option indicates client mode.
-i, --interface <interface> Interface to attach XDP program.(Required)
-l, --log-level <level> Log level.(trace/debug/info/warn/error/none, default: info)
服务端只需要指定 --interface ，客户端还需要用 --target 指定服务端，可以多次传入指定多个服务端
本项目部分思路受 mimic 启发
Wrap udp packet with icmp header using bpf
Copyright (C) 2025 PinkD
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.