Openwrt netifd 解析-2

原文地址：http://xinliang.me/blog/?p=156

netifd interface RPC

netifd为每个interface object注册了一组相同的methods，如下：

static struct ubus_method iface_object_methods[] = { { .name = "up", .handler = netifd_handle_up }, { .name = "down", .handler = netifd_handle_down }, { .name = "status", .handler = netifd_handle_status }, { .name = "prepare", .handler = netifd_handle_iface_prepare }, UBUS_METHOD("add_device", netifd_iface_handle_device, dev_policy ), UBUS_METHOD("remove_device", netifd_iface_handle_device, dev_policy ), { .name = "notify_proto", .handler = netifd_iface_notify_proto }, { .name = "remove", .handler = netifd_iface_remove }, { .name = "set_data", .handler = netifd_handle_set_data }, };

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static struct ubus_method iface_object_methods[] = { { .name = "up", .handler = netifd_handle_up }, { .name = "down", .handler = netifd_handle_down }, { .name = "status", .handler = netifd_handle_status }, { .name = "prepare", .handler = netifd_handle_iface_prepare }, UBUS_METHOD("add_device", netifd_iface_handle_device, dev_policy ), UBUS_METHOD("remove_device", netifd_iface_handle_device, dev_policy ), { .name = "notify_proto", .handler = netifd_iface_notify_proto }, { .name = "remove", .handler = netifd_iface_remove }, { .name = "set_data", .handler = netifd_handle_set_data }, };

然后可以发现，netifd里面还有一个protocol handler的概念，也就是对不同的interface protocol，可以提供不同的handler，来响应各种可能的事件。最常见的static类型的protocol，内置在netifd中。而dhcp，pppoe等类型的协议，则以shell script的形式提供。

netifd protocol handler插件

netifd的protocol handler插件位于/lib/netifd/proto/目录下，名称统一为*.sh。