[RK3288][Android6.0] 网络服务Netd初始化流程小结

Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92

Netd: Network Daemon.

负责网络配置，操作，管理，查询等功能．
封装底层各种类型网络，如PPP,SOFTAP等,给framework提供统一接口.
说白了就是接收framework命令往下发,接收kernel命令往上发.

路径: system/netd

[kris@:~/rk3288/system/netd]$ ls
Android.mk client include server
[kris@:~/rk3288/system/netd]$ tree
.
├── Android.mk
├── client
│   ├── Android.mk
│   ├── FwmarkClient.cpp
│   ├── FwmarkClient.h
│   └── NetdClient.cpp
├── include
│   ├── FwmarkCommand.h
│   ├── Fwmark.h
│   ├── NetdClient.h
│   └── Permission.h
└── server
    ├── Android.mk
    ├── BandwidthController.cpp
    ├── BandwidthController.h
    ├── ClatdController.cpp
    ├── ClatdController.h
    ├── CleanSpec.mk
    ├── CommandListener.cpp
    ├── CommandListener.h
    ├── ConnmarkFlags.h
    ├── DnsProxyListener.cpp
    ├── DnsProxyListener.h
    ├── DummyNetwork.cpp
    ├── DummyNetwork.h
    ├── FirewallController.cpp
    ├── FirewallController.h
    ├── FwmarkServer.cpp
    ├── FwmarkServer.h
    ├── IdletimerController.cpp
    ├── IdletimerController.h
    ├── InterfaceController.cpp
    ├── InterfaceController.h
    ├── List.h
    ├── LocalNetwork.cpp
    ├── LocalNetwork.h
    ├── main.cpp
    ├── MDnsSdListener.cpp
    ├── MDnsSdListener.h
    ├── NatController.cpp
    ├── NatController.h
    ├── ndc.c
    ├── NetdCommand.cpp
    ├── NetdCommand.h
    ├── NetdConstants.cpp
    ├── NetdConstants.h
    ├── NetlinkHandler.cpp
    ├── NetlinkHandler.h
    ├── NetlinkManager.cpp
    ├── NetlinkManager.h
    ├── NetworkController.cpp
    ├── NetworkController.h
    ├── Network.cpp
    ├── Network.h
    ├── oem_iptables_hook.cpp
    ├── oem_iptables_hook.h
    ├── PhysicalNetwork.cpp
    ├── PhysicalNetwork.h
    ├── PppController.cpp
    ├── PppController.h
    ├── ResolverController.cpp
    ├── ResolverController.h
    ├── ResponseCode.h
    ├── RouteController.cpp
    ├── RouteController.h
    ├── SoftapController.cpp
    ├── SoftapController.h
    ├── StrictController.cpp
    ├── StrictController.h
    ├── TetherController.cpp
    ├── TetherController.h
    ├── UidRanges.cpp
    ├── UidRanges.h
    ├── VirtualNetwork.cpp
    └── VirtualNetwork.h

3 directories, 72 files

服务启动：
system/core/rootdir/init.rc

service netd /system/bin/netdclass mainsocket netd stream 0660 root systemsocket dnsproxyd stream 0660 root inetsocket mdns stream 0660 root systemsocket fwmarkd stream 0660 root inet

创建了４个socket:
netd: 用于framework和kernel命令交互.
dnsproxyd: 用于dns
mdns: 用于网内无dns服务器时的情况
fwmarkd: 对特定的socket设定mark值.

下面代码流程里提到的
CommandListener, DnsproxyListener, MdnsSdListener以及FwmarkServer
这四个类就是对应的上面四个socket, 它们分别用于接收framework的各类信息.

初始化流程：
借用网友的一张框图,画得很好,再看代码就很清晰了.

main -> main.cpp

NetlinkManager::Instance -> NetlinkManager.cpp
       new NetlinkManager   //主要接收来自kernel的uevent事件,由NetlinkHandle来完成接收,然后通过CommandListener通知framework.
   new CommandListener ->   //用于和framework交互
       FrameworkListener("netd", true)   -> //父类构造桉树,socket是"netd", 说明和framework通过netd socket来交互了. BTW, vold也使用此方式和framework通信.
           SocketListener ->
               new SocketClientCollection   //创建socket client
       registerCmd(new NatCmd()); ->   //注册各类cmd供framework调用kernel.
           FrameworkListener::registerCmd ->   FrameworkListener.cpp
               mCommands->push_back   //保存到cmd列表中
           new NetworkController   //以下创建各个cmd对应的类,对应各个cmd的实现定义.
           new NatCmd
           ......
   nm->start ->
       NetlinkManager::start ->
           setupSocket   //创建三种类型socket, 分别是NETLINK_KOBJECT_UEVENT, NETLINK_ROUTE以及NETLINK_NFLOG.
                       NETLINK_KOBJECT_UEVENT: 一般用来通知内核某个模块安装或者卸载。
                       NETLINK_ROUTE：网络变化时会触发此消息。
                       NETLINK_NFLOG：带宽预警消息通知。
           socket   //标准创建socket接口方法.
           bind
           new NetlinkHandler   -> NetlinkHandler.cpp
               NetlinkListener ->
                   SocketListener
           handler->start ->
               NetlinkHandler::start ->
                   this->startListener ->
                       SocketListener::startListener ->
                           pthread_create ->
                               SocketListener::threadStart ->
                                   me->runListener ->
                                       accept
                                       onDataAvailable   -> 调用各个lister接口,这里是NetlinkListener
                                           uevent_kernel_recv
                                           new NetlinkEvent
                                           evt->decode
                                           onEvent ->
                                               NetlinkHandler::onEvent ->
                                                   notifyInterfaceAdded ->
                                                       mNm->getBroadcaster()->sendBroadcast //通知framework

参考:

http://m.blog.csdn.net/article/details?id=46447641

http://blog.csdn.net/ltm157/article/details/24799351

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