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/*
* wprobe.h: API for the wireless probe interface
* Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __WPROBE_H
#define __WPROBE_H
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/if_ether.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <net/genetlink.h>
#endif
/**
* enum wprobe_attr: netlink attribute list
*
* @WPROBE_ATTR_UNSPEC: unused
*
* @WPROBE_ATTR_INTERFACE: interface name to process query on (NLA_STRING)
* @WPROBE_ATTR_MAC: mac address (used for wireless links) (NLA_STRING)
* @WPROBE_ATTR_FLAGS: interface/link/attribute flags (see enum wprobe_flags) (NLA_U32)a
* @WPROBE_ATTR_DURATION: sampling duration (in milliseconds) (NLA_MSECS)
*
* @WPROBE_ATTR_ID: attribute id (NLA_U32)
* @WPROBE_ATTR_NAME: attribute name (NLA_STRING)
* @WPROBE_ATTR_TYPE: attribute type (NLA_U8)
*
* attribute values:
*
* @WPROBE_VAL_STRING: string value (NLA_STRING)
* @WPROBE_VAL_S8: signed 8-bit integer (NLA_U8)
* @WPROBE_VAL_S16: signed 16-bit integer (NLA_U16)
* @WPROBE_VAL_S32: signed 32-bit integer (NLA_U32)
* @WPROBE_VAL_S64: signed 64-bit integer (NLA_U64)
* @WPROBE_VAL_U8: unsigned 8-bit integer (NLA_U8)
* @WPROBE_VAL_U16: unsigned 16-bit integer (NLA_U16)
* @WPROBE_VAL_U32: unsigned 32-bit integer (NLA_U32)
* @WPROBE_VAL_U64: unsigned 64-bit integer (NLA_U64)
*
* statistics:
* @WPROBE_VAL_SUM: sum of all samples
* @WPROBE_VAL_SUM_SQ: sum of all samples^2
* @WPROBE_VAL_SAMPLES: number of samples
* @WPROBE_VAL_SCALE_TIME: last time the samples were scaled down
*
* configuration:
* @WPROBE_ATTR_INTERVAL: (measurement interval in milliseconds) (NLA_MSECS)
* @WPROBE_ATTR_SAMPLES_MIN: minimum samples to keep during inactivity (NLA_U32)
* @WPROBE_ATTR_SAMPLES_MAX: maximum samples to keep before scaling down (NLA_U32)
* @WPROBE_ATTR_SAMPLES_SCALE_M: multiplier for scaling down samples (NLA_U32)
* @WPROBE_ATTR_SAMPLES_SCALE_D: divisor for scaling down samples (NLA_U32)
*
* @WPROBE_ATTR_LAST: unused
*/
enum wprobe_attr {
/* query attributes */
WPROBE_ATTR_UNSPEC,
WPROBE_ATTR_INTERFACE,
WPROBE_ATTR_MAC,
WPROBE_ATTR_FLAGS,
/* response data */
WPROBE_ATTR_ID,
WPROBE_ATTR_NAME,
WPROBE_ATTR_TYPE,
WPROBE_ATTR_DURATION,
/* value type attributes */
WPROBE_VAL_STRING,
WPROBE_VAL_S8,
WPROBE_VAL_S16,
WPROBE_VAL_S32,
WPROBE_VAL_S64,
WPROBE_VAL_U8,
WPROBE_VAL_U16,
WPROBE_VAL_U32,
WPROBE_VAL_U64,
/* aggregates for statistics */
WPROBE_VAL_SUM,
WPROBE_VAL_SUM_SQ,
WPROBE_VAL_SAMPLES,
WPROBE_VAL_SCALE_TIME,
/* config attributes */
WPROBE_ATTR_INTERVAL,
WPROBE_ATTR_SAMPLES_MIN,
WPROBE_ATTR_SAMPLES_MAX,
WPROBE_ATTR_SAMPLES_SCALE_M,
WPROBE_ATTR_SAMPLES_SCALE_D,
WPROBE_ATTR_LAST
};
/**
* enum wprobe_cmd: netlink commands for interacting with wprobe
*
* @WPROBE_CMD_UNSPEC: unused
*
* @WPROBE_CMD_GET_LIST: get global/link property list
* @WPROBE_CMD_GET_INFO: get global/link properties
* @WPROBE_CMD_SET_FLAGS: set global/link flags
* @WPROBE_CMD_MEASURE: take a snapshot of the current data
* @WPROBE_CMD_GET_LINKS: get a list of links
*
* @WPROBE_CMD_LAST: unused
*
* options for GET_INFO and SET_FLAGS:
* - mac address set: per-link
* - mac address unset: globalsa
*/
enum wprobe_cmd {
WPROBE_CMD_UNSPEC,
WPROBE_CMD_GET_LIST,
WPROBE_CMD_GET_INFO,
WPROBE_CMD_SET_FLAGS,
WPROBE_CMD_MEASURE,
WPROBE_CMD_GET_LINKS,
WPROBE_CMD_CONFIG,
WPROBE_CMD_LAST
};
/**
* enum wprobe_flags: flags for wprobe links and items
* @WPROBE_F_KEEPSTAT: keep statistics for this link/device
* @WPROBE_F_RESET: reset statistics now (used only in WPROBE_CMD_SET_LINK)
* @WPROBE_F_NEWDATA: used to indicate that a value has been updated
*/
enum wprobe_flags {
WPROBE_F_KEEPSTAT = (1 << 0),
WPROBE_F_RESET = (1 << 1),
WPROBE_F_NEWDATA = (1 << 2),
};
#ifdef __KERNEL__
struct wprobe_link;
struct wprobe_item;
struct wprobe_source;
/**
* struct wprobe_link - data structure describing a wireless link
* @iface: pointer to the wprobe_iface that this link belongs to
* @addr: BSSID of the remote link partner
* @flags: link flags (see wprobe_flags)
* @priv: user pointer
*
* @list: for internal use
* @val: for internal use
*/
struct wprobe_link {
struct list_head list;
struct wprobe_iface *iface;
char addr[ETH_ALEN];
u32 flags;
void *priv;
void *val;
};
/**
* struct wprobe_item - data structure describing the format of wprobe_link::data or wprobe_iface::data
* @name: name of the field
* @type: data type of this field
* @flags: measurement item flags (see wprobe_flags)
*/
struct wprobe_item {
const char *name;
enum wprobe_attr type;
u32 flags;
};
struct wprobe_value {
bool pending;
union {
/*
* the following are kept uppercase to allow
* for automated checking against WPROBE_VAL_*
* via BUG_ON()
*/
const char *STRING;
u8 U8;
u16 U16;
u32 U32;
u64 U64;
s8 S8;
s16 S16;
s32 S32;
s64 S64;
};
s64 s, ss;
unsigned int n;
/* timestamps */
u64 first, last;
u64 scale_timestamp;
};
/**
* struct wprobe_source - data structure describing a wireless interface
*
* @name: name of the interface
* @addr: local mac address of the interface
* @links: list of wireless links to poll
* @link_items: description of the per-link data structure
* @n_link_items: number of link description items
* @global_items: description of the per-interface data structure
* @n_global_items: number of per-interface description items
* @sync_data: callback allowing the driver to prepare data for the wprobe poll
*
* @list: head for the list of interfaces
* @priv: user pointer
* @lock: spinlock protecting value data access
* @val: internal use
* @query_val: internal use
*
* if sync_data is NULL, wprobe assumes that it can access the data structure
* at any time (in atomic context). if sync_data returns a negative error code,
* the poll request will not be handled for the given link
*/
struct wprobe_iface {
/* to be filled in by wprobe source drivers */
const char *name;
const char *addr;
const struct wprobe_item *link_items;
int n_link_items;
const struct wprobe_item *global_items;
int n_global_items;
int (*sync_data)(struct wprobe_iface *dev, struct wprobe_link *l,
struct wprobe_value *val, bool measure);
void *priv;
/* handled by the wprobe core */
struct list_head list;
struct list_head links;
spinlock_t lock;
void *val;
void *query_val;
u32 measure_interval;
struct timer_list measure_timer;
u32 scale_min;
u32 scale_max;
u32 scale_m;
u32 scale_d;
};
#define WPROBE_FILL_BEGIN(_ptr, _list) do { \
struct wprobe_value *__val = (_ptr); \
const struct wprobe_item *__item = _list; \
u64 __msecs = jiffies_to_msecs(jiffies)
#define WPROBE_SET(_idx, _type, _value) \
if (__item[_idx].type != WPROBE_VAL_##_type) { \
printk("ERROR: invalid data type at %s:%d\n", __FILE__, __LINE__); \
break; \
} \
__val[_idx].pending = true; \
__val[_idx]._type = _value; \
if (!__val[_idx].first) \
__val[_idx].first = __msecs; \
__val[_idx].first = __msecs
#define WPROBE_FILL_END() \
} while(0)
/**
* wprobe_add_iface: register an interface with the wireless probe subsystem
* @dev: wprobe_iface structure describing the interface
*/
extern int __weak wprobe_add_iface(struct wprobe_iface *dev);
/**
* wprobe_remove_iface: deregister an interface from the wireless probe subsystem
* @dev: wprobe_iface structure describing the interface
*/
extern void __weak wprobe_remove_iface(struct wprobe_iface *dev);
/**
* wprobe_add_link: register a new wireless link
* @dev: wprobe_iface structure describing the interface
* @l: storage space for the wprobe_link structure
* @addr: mac address of the new link
*
* the entire wprobe_link structure is overwritten by this function call
*/
extern int __weak wprobe_add_link(struct wprobe_iface *dev, struct wprobe_link *l, const char *addr);
/**
* wprobe_remove_link: deregister a previously registered wireless link
* @dev: wprobe_iface structure describing the interface
* @l: wprobe_link data structure
*/
extern void __weak wprobe_remove_link(struct wprobe_iface *dev, struct wprobe_link *l);
/**
* wprobe_update_stats: update statistics after sampling values
* @dev: wprobe_iface structure describing the interface
* @l: wprobe_link data structure
*
* if l == NULL, then the stats for globals are updated
*/
extern void __weak wprobe_update_stats(struct wprobe_iface *dev, struct wprobe_link *l);
#endif /* __KERNEL__ */
#endif
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