关键词：函数调用；网络电话；流量压缩；应用程序；防御
摘 要：Function calls are a basic primitive by which applications invoke services from external entities. In this paper, we propose “network calls” (netcalls), a general primitive to invoke advanced traffic processing services – such as firewalling or caching – from the network. We design and implement the netcalls API and a backend architecture to support netcalls, allowing end host applications to interact with services not only in their own access network, but any network their traffic traverses. Demonstrating the utility of netcalls, we built three applications to invoke netcalls, along with corresponding network services: interdomain firewalling for DDoS defense, ‘opportunistic’ traffic compression, and intrusion detection for mobile phones.