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 struct device_type {
  23         struct list_head list;
  24         const char *name;
  25
  26         const struct config_param_list *config_params;
  27
  28         struct device *(*create)(struct blob_attr *attr);
  29         void (*dump_status)(struct device *, struct blob_buf *buf);
  30         int (*check_state)(struct device *);
  31         void (*free)(struct device *);
  32 };
  33
  34 enum {
  35         DEV_OPT_MTU             = (1 << 0),
  36         DEV_OPT_MACADDR         = (1 << 1),
  37         DEV_OPT_TXQUEUELEN      = (1 << 2)
  38 };
  39
  40 /*
  41  * link layer device. typically represents a linux network device.
  42  * can be used to support VLANs as well
  43  */
  44 struct device {
  45         const struct device_type *type;
  46
  47         struct avl_node avl;
  48         struct list_head users;
  49
  50         char ifname[IFNAMSIZ + 1];
  51         int ifindex;
  52
  53         bool present;
  54         int active;
  55
  56         /* set interface up or down */
  57         device_state_cb set_state;
  58
  59         const struct device_hotplug_ops *hotplug_ops;
  60
  61         /* settings */
  62         unsigned int flags;
  63
  64         unsigned int mtu;
  65         unsigned int txqueuelen;
  66         uint8_t macaddr[6];
  67
  68         uint32_t config_hash;
  69 };
  70
  71 /* events broadcasted to all users of a device */
  72 enum device_event {
  73         DEV_EVENT_ADD,
  74         DEV_EVENT_REMOVE,
  75
  76         DEV_EVENT_SETUP,
  77         DEV_EVENT_TEARDOWN,
  78         DEV_EVENT_UP,
  79         DEV_EVENT_DOWN,
  80
  81         DEV_EVENT_LINK_UP,
  82         DEV_EVENT_LINK_DOWN,
  83 };
  84
  85 /*
  86  * device dependency with callbacks
  87  */
  88 struct device_user {
  89         struct list_head list;
  90
  91         bool claimed;
  92         struct device *dev;
  93         void (*cb)(struct device_user *, enum device_event);
  94 };
  95
  96 struct device_hotplug_ops {
  97         int (*add)(struct device *main, struct device *member);
  98         int (*del)(struct device *main, struct device *member);
  99 };
 100
 101 extern const struct config_param_list device_attr_list;
 102 extern const struct device_type simple_device_type;
 103 extern const struct device_type bridge_device_type;
 104
 105 void device_init_settings(struct device *dev, struct blob_attr **tb);
 106
 107 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name);
 108 int device_init(struct device *iface, const struct device_type *type, const char *ifname);
 109 void device_cleanup(struct device *iface);
 110 struct device *device_get(const char *name, bool create);
 111 void device_add_user(struct device_user *dep, struct device *iface);
 112 void device_remove_user(struct device_user *dep);
 113
 114 void device_set_present(struct device *dev, bool state);
 115 int device_claim(struct device_user *dep);
 116 void device_release(struct device_user *dep);
 117 int check_device_state(struct device *dev);
 118
 119 static inline void
 120 device_free(struct device *dev)
 121 {
 122         dev->type->free(dev);
 123 }
 124
 125 void device_free_unused(struct device *dev);
 126
 127 struct device *get_vlan_device_chain(const char *ifname, bool create);
 128
 129 #endif