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情况是这样子的:由于某原因我写了个 netfilter_queue 程序拦截 DNS 请求,并
且会在特定情况下替代 DNS 服务器返回 DNS 回应。我开了个 raw UDP socket,
发现偶尔 sendto 会返回 EPERM。已经确定目标地址正常,不是广播地址。报文内
容也没什么特殊的。UDP 校验和我填的全零。