原始套接字与抓包过滤规则setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, ...)
英文资料:https://www.kernel.org/doc/Documentation/networking/filter.txthttps://github.com/torvalds/linux/blob/master/tools/testing/selftests/net/psock_lib.h#L29-L73structsock_filterfilter[]={{0x28,0,0,0x0