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_user;
   9 struct device_hotplug_ops;
  10
  11 typedef int (*device_state_cb)(struct device *, bool up);
  12
  13 enum {
  14         DEV_ATTR_TYPE,
  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)(const char *name, struct blob_attr *attr);
  35         void (*config_init)(struct device *);
  36         enum dev_change_type (*reload)(struct device *, struct blob_attr *);
  37         void (*dump_info)(struct device *, struct blob_buf *buf);
  38         void (*dump_stats)(struct device *, struct blob_buf *buf);
  39         int (*check_state)(struct device *);
  40         void (*free)(struct device *);
  41 };
  42
  43 enum {
  44         DEV_OPT_MTU             = (1 << 0),
  45         DEV_OPT_MACADDR         = (1 << 1),
  46         DEV_OPT_TXQUEUELEN      = (1 << 2)
  47 };
  48
  49 /* events broadcasted to all users of a device */
  50 enum device_event {
  51         DEV_EVENT_ADD,
  52         DEV_EVENT_REMOVE,
  53
  54         DEV_EVENT_SETUP,
  55         DEV_EVENT_TEARDOWN,
  56         DEV_EVENT_UP,
  57         DEV_EVENT_DOWN,
  58
  59         DEV_EVENT_LINK_UP,
  60         DEV_EVENT_LINK_DOWN,
  61 };
  62
  63 /*
  64  * device dependency with callbacks
  65  */
  66 struct device_user {
  67         struct list_head list;
  68
  69         bool claimed;
  70         bool hotplug;
  71
  72         struct device *dev;
  73         void (*cb)(struct device_user *, enum device_event);
  74 };
  75
  76 /*
  77  * link layer device. typically represents a linux network device.
  78  * can be used to support VLANs as well
  79  */
  80 struct device {
  81         const struct device_type *type;
  82
  83         struct avl_node avl;
  84         struct list_head users;
  85
  86         char ifname[IFNAMSIZ + 1];
  87         int ifindex;
  88
  89         struct blob_attr *config;
  90         bool config_pending;
  91         bool present;
  92         int active;
  93         bool external;
  94
  95         bool current_config;
  96         bool default_config;
  97
  98         /* set interface up or down */
  99         device_state_cb set_state;
 100
 101         const struct device_hotplug_ops *hotplug_ops;
 102
 103         struct device_user parent;
 104
 105         /* settings */
 106         unsigned int flags;
 107
 108         unsigned int mtu;
 109         unsigned int txqueuelen;
 110         uint8_t macaddr[6];
 111 };
 112
 113 struct device_hotplug_ops {
 114         int (*prepare)(struct device *dev);
 115         int (*add)(struct device *main, struct device *member);
 116         int (*del)(struct device *main, struct device *member);
 117 };
 118
 119 extern const struct config_param_list device_attr_list;
 120 extern const struct device_type simple_device_type;
 121 extern const struct device_type bridge_device_type;
 122
 123 void device_lock(void);
 124 void device_unlock(void);
 125
 126 struct device *device_create(const char *name, const struct device_type *type,
 127                              struct blob_attr *config);
 128 void device_init_settings(struct device *dev, struct blob_attr **tb);
 129 void device_init_pending(void);
 130
 131 enum dev_change_type
 132 device_set_config(struct device *dev, const struct device_type *type,
 133                   struct blob_attr *attr);
 134
 135 void device_reset_config(void);
 136 void device_reset_old(void);
 137
 138 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name);
 139 int device_init(struct device *iface, const struct device_type *type, const char *ifname);
 140 void device_cleanup(struct device *iface);
 141 struct device *device_get(const char *name, int create);
 142 void device_add_user(struct device_user *dep, struct device *iface);
 143 void device_remove_user(struct device_user *dep);
 144
 145 void device_set_present(struct device *dev, bool state);
 146 int device_claim(struct device_user *dep);
 147 void device_release(struct device_user *dep);
 148 int device_check_state(struct device *dev);
 149 void device_dump_status(struct blob_buf *b, struct device *dev);
 150
 151 static inline void
 152 device_free(struct device *dev)
 153 {
 154         dev->type->free(dev);
 155 }
 156
 157 void device_free_unused(struct device *dev);
 158
 159 struct device *get_vlan_device_chain(const char *ifname, bool create);
 160 void alias_notify_device(const char *name, struct device *dev);
 161
 162 #endif