device.h

   1 #ifndef __LL_H
   2 #define __LL_H
   3
   4 #include <libubox/avl.h>
   5 #include <netinet/in.h>
   6
   7 struct device;
   8 struct device_hotplug_ops;
   9
  10 typedef int (*device_state_cb)(struct device *, bool up);
  11
  12 enum {
  13         DEV_ATTR_TYPE,
  14         DEV_ATTR_NAME,
  15         DEV_ATTR_IFNAME,
  16         DEV_ATTR_MTU,
  17         DEV_ATTR_MACADDR,
  18         DEV_ATTR_TXQUEUELEN,
  19         __DEV_ATTR_MAX,
  20 };
  21
  22 enum dev_change_type {
  23         DEV_CONFIG_NO_CHANGE,
  24         DEV_CONFIG_APPLIED,
  25         DEV_CONFIG_RECREATE,
  26 };
  27
  28 struct device_type {
  29         struct list_head list;
  30         const char *name;
  31
  32         const struct config_param_list *config_params;
  33
  34         struct device *(*create)(struct blob_attr *attr);
  35         void (*config_init)(struct device *);
  36         enum dev_change_type (*reload)(struct device *, struct blob_attr *);
  37         void (*dump_status)(struct device *, struct blob_buf *buf);
  38         int (*check_state)(struct device *);
  39         void (*free)(struct device *);
  40 };
  41
  42 enum {
  43         DEV_OPT_MTU             = (1 << 0),
  44         DEV_OPT_MACADDR         = (1 << 1),
  45         DEV_OPT_TXQUEUELEN      = (1 << 2)
  46 };
  47
  48 /*
  49  * link layer device. typically represents a linux network device.
  50  * can be used to support VLANs as well
  51  */
  52 struct device {
  53         const struct device_type *type;
  54
  55         struct avl_node avl;
  56         struct list_head users;
  57
  58         char ifname[IFNAMSIZ + 1];
  59         int ifindex;
  60
  61         struct blob_attr *config;
  62         bool config_pending;
  63         bool present;
  64         int active;
  65
  66         bool current_config;
  67         bool default_config;
  68
  69         /* set interface up or down */
  70         device_state_cb set_state;
  71
  72         const struct device_hotplug_ops *hotplug_ops;
  73
  74         /* settings */
  75         unsigned int flags;
  76
  77         unsigned int mtu;
  78         unsigned int txqueuelen;
  79         uint8_t macaddr[6];
  80 };
  81
  82 /* events broadcasted to all users of a device */
  83 enum device_event {
  84         DEV_EVENT_ADD,
  85         DEV_EVENT_REMOVE,
  86
  87         DEV_EVENT_SETUP,
  88         DEV_EVENT_TEARDOWN,
  89         DEV_EVENT_UP,
  90         DEV_EVENT_DOWN,
  91
  92         DEV_EVENT_LINK_UP,
  93         DEV_EVENT_LINK_DOWN,
  94 };
  95
  96 /*
  97  * device dependency with callbacks
  98  */
  99 struct device_user {
 100         struct list_head list;
 101
 102         bool claimed;
 103         struct device *dev;
 104         void (*cb)(struct device_user *, enum device_event);
 105 };
 106
 107 struct device_hotplug_ops {
 108         int (*add)(struct device *main, struct device *member);
 109         int (*del)(struct device *main, struct device *member);
 110 };
 111
 112 extern const struct config_param_list device_attr_list;
 113 extern const struct device_type simple_device_type;
 114 extern const struct device_type bridge_device_type;
 115
 116 struct device *device_create(const char *name, const struct device_type *type,
 117                              struct blob_attr *config);
 118 void device_init_settings(struct device *dev, struct blob_attr **tb);
 119 void device_init_pending(void);
 120
 121 void device_reset_config(void);
 122 void device_reset_old(void);
 123
 124 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name);
 125 int device_init(struct device *iface, const struct device_type *type, const char *ifname);
 126 void device_cleanup(struct device *iface);
 127 struct device *device_get(const char *name, bool create);
 128 void device_add_user(struct device_user *dep, struct device *iface);
 129 void device_remove_user(struct device_user *dep);
 130
 131 void device_set_present(struct device *dev, bool state);
 132 int device_claim(struct device_user *dep);
 133 void device_release(struct device_user *dep);
 134 int device_check_state(struct device *dev);
 135
 136 static inline void
 137 device_free(struct device *dev)
 138 {
 139         dev->type->free(dev);
 140 }
 141
 142 void device_free_unused(struct device *dev);
 143
 144 struct device *get_vlan_device_chain(const char *ifname, bool create);
 145
 146 #endif