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         enum dev_change_type (*reload)(struct device *, struct blob_attr *);
  36         void (*dump_status)(struct device *, struct blob_buf *buf);
  37         int (*check_state)(struct device *);
  38         void (*free)(struct device *);
  39 };
  40
  41 enum {
  42         DEV_OPT_MTU             = (1 << 0),
  43         DEV_OPT_MACADDR         = (1 << 1),
  44         DEV_OPT_TXQUEUELEN      = (1 << 2)
  45 };
  46
  47 /*
  48  * link layer device. typically represents a linux network device.
  49  * can be used to support VLANs as well
  50  */
  51 struct device {
  52         const struct device_type *type;
  53
  54         struct avl_node avl;
  55         struct list_head users;
  56
  57         char ifname[IFNAMSIZ + 1];
  58         int ifindex;
  59
  60         struct blob_attr *config;
  61         bool present;
  62         int active;
  63
  64         /* set interface up or down */
  65         device_state_cb set_state;
  66
  67         const struct device_hotplug_ops *hotplug_ops;
  68
  69         /* settings */
  70         unsigned int flags;
  71
  72         unsigned int mtu;
  73         unsigned int txqueuelen;
  74         uint8_t macaddr[6];
  75 };
  76
  77 /* events broadcasted to all users of a device */
  78 enum device_event {
  79         DEV_EVENT_ADD,
  80         DEV_EVENT_REMOVE,
  81
  82         DEV_EVENT_SETUP,
  83         DEV_EVENT_TEARDOWN,
  84         DEV_EVENT_UP,
  85         DEV_EVENT_DOWN,
  86
  87         DEV_EVENT_LINK_UP,
  88         DEV_EVENT_LINK_DOWN,
  89 };
  90
  91 /*
  92  * device dependency with callbacks
  93  */
  94 struct device_user {
  95         struct list_head list;
  96
  97         bool claimed;
  98         struct device *dev;
  99         void (*cb)(struct device_user *, enum device_event);
 100 };
 101
 102 struct device_hotplug_ops {
 103         int (*add)(struct device *main, struct device *member);
 104         int (*del)(struct device *main, struct device *member);
 105 };
 106
 107 extern const struct config_param_list device_attr_list;
 108 extern const struct device_type simple_device_type;
 109 extern const struct device_type bridge_device_type;
 110
 111 struct device *device_create(const char *name, const struct device_type *type,
 112                              struct blob_attr *config);
 113 void device_init_settings(struct device *dev, struct blob_attr **tb);
 114
 115 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name);
 116 int device_init(struct device *iface, const struct device_type *type, const char *ifname);
 117 void device_cleanup(struct device *iface);
 118 struct device *device_get(const char *name, bool create);
 119 void device_add_user(struct device_user *dep, struct device *iface);
 120 void device_remove_user(struct device_user *dep);
 121
 122 void device_set_present(struct device *dev, bool state);
 123 int device_claim(struct device_user *dep);
 124 void device_release(struct device_user *dep);
 125 int check_device_state(struct device *dev);
 126
 127 static inline void
 128 device_free(struct device *dev)
 129 {
 130         dev->type->free(dev);
 131 }
 132
 133 void device_free_unused(struct device *dev);
 134
 135 struct device *get_vlan_device_chain(const char *ifname, bool create);
 136
 137 #endif