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Diffstat (limited to 'package/wprobe/src/kernel/linux')
| -rw-r--r-- | package/wprobe/src/kernel/linux/wprobe.h | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/package/wprobe/src/kernel/linux/wprobe.h b/package/wprobe/src/kernel/linux/wprobe.h new file mode 100644 index 000000000..901daf3d1 --- /dev/null +++ b/package/wprobe/src/kernel/linux/wprobe.h @@ -0,0 +1,397 @@ +/* + * 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 <linux/filter.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_FILTER, + + WPROBE_ATTR_FILTER_GROUP, + WPROBE_ATTR_RXCOUNT, + WPROBE_ATTR_TXCOUNT, + + 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_CONFIG: set config options + * @WPROBE_CMD_GET_FILTER: get counters for active filters + * + * @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_GET_FILTER, + 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 + * @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_value; + +/** + * 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; + struct wprobe_value *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_filter_item_hdr { + char name[32]; + __be32 n_items; +} __attribute__((packed)); + +struct wprobe_filter_item { + struct wprobe_filter_item_hdr hdr; + struct sock_filter filter[]; +} __attribute__((packed)); + +struct wprobe_filter_counter { + u64 tx; + u64 rx; +}; + +struct wprobe_filter_group { + const char *name; + int n_items; + struct wprobe_filter_item **items; + struct wprobe_filter_counter *counters; +}; + +struct wprobe_filter_hdr { + __u8 magic[4]; + __u8 version; + __u8 hdrlen; + __u16 n_groups; +} __attribute__((packed)); + +struct wprobe_filter { + spinlock_t lock; + struct sk_buff *skb; + void *data; + int n_groups; + int hdrlen; + struct wprobe_filter_item **items; + struct wprobe_filter_counter *counters; + struct wprobe_filter_group groups[]; +}; + +enum { + WPROBE_PKT_RX = 0x00, + WPROBE_PKT_TX = 0x10, +}; + +struct wprobe_wlan_hdr { + u16 len; + u8 snr; + u8 type; +} __attribute__((packed)); + + +/** + * 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; + struct wprobe_value *val; + struct wprobe_value *query_val; + struct wprobe_filter *active_filter; + + 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); + +/** + * wprobe_add_frame: add frame for layer 2 analysis + * @dev: wprobe_iface structure describing the interface + * @hdr: metadata for the frame + * @data: 802.11 header pointer + * @len: length of the 802.11 header + */ +extern int __weak wprobe_add_frame(struct wprobe_iface *dev, const struct wprobe_wlan_hdr *hdr, void *data, int len); + +#endif /* __KERNEL__ */ + +#endif |