ieee80211_i.h

linux 内核源代码

/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef IEEE80211_I_H
#define IEEE80211_I_H

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/if_ether.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/etherdevice.h>
#include <net/wireless.h>
#include "ieee80211_key.h"
#include "sta_info.h"

/* ieee80211.o internal definitions, etc. These are not included into
 * low-level drivers. */

#ifndef ETH_P_PAE
#define ETH_P_PAE 0x888E /* Port Access Entity (IEEE 802.1X) */
#endif /* ETH_P_PAE */

#define WLAN_FC_DATA_PRESENT(fc) (((fc) & 0x4c) == 0x08)

struct ieee80211_local;

#define IEEE80211_ALIGN32_PAD(a) ((4 - ((a) & 3)) & 3)

/* Maximum number of broadcast/multicast frames to buffer when some of the
 * associated stations are using power saving. */
#define AP_MAX_BC_BUFFER 128

/* Maximum number of frames buffered to all STAs, including multicast frames.
 * Note: increasing this limit increases the potential memory requirement. Each
 * frame can be up to about 2 kB long. */
#define TOTAL_MAX_TX_BUFFER 512

/* Required encryption head and tailroom */
#define IEEE80211_ENCRYPT_HEADROOM 8
#define IEEE80211_ENCRYPT_TAILROOM 12

/* IEEE 802.11 (Ch. 9.5 Defragmentation) requires support for concurrent
 * reception of at least three fragmented frames. This limit can be increased
 * by changing this define, at the cost of slower frame reassembly and
 * increased memory use (about 2 kB of RAM per entry). */
#define IEEE80211_FRAGMENT_MAX 4

struct ieee80211_fragment_entry {
	unsigned long first_frag_time;
	unsigned int seq;
	unsigned int rx_queue;
	unsigned int last_frag;
	unsigned int extra_len;
	struct sk_buff_head skb_list;
	int ccmp; /* Whether fragments were encrypted with CCMP */
	u8 last_pn[6]; /* PN of the last fragment if CCMP was used */
};


struct ieee80211_sta_bss {
	struct list_head list;
	struct ieee80211_sta_bss *hnext;
	atomic_t users;

	u8 bssid[ETH_ALEN];
	u8 ssid[IEEE80211_MAX_SSID_LEN];
	size_t ssid_len;
	u16 capability; /* host byte order */
	int hw_mode;
	int channel;
	int freq;
	int rssi, signal, noise;
	u8 *wpa_ie;
	size_t wpa_ie_len;
	u8 *rsn_ie;
	size_t rsn_ie_len;
	u8 *wmm_ie;
	size_t wmm_ie_len;
#define IEEE80211_MAX_SUPP_RATES 32
	u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
	size_t supp_rates_len;
	int beacon_int;
	u64 timestamp;

	int probe_resp;
	unsigned long last_update;

	/* during assocation, we save an ERP value from a probe response so
	 * that we can feed ERP info to the driver when handling the
	 * association completes. these fields probably won't be up-to-date
	 * otherwise, you probably don't want to use them. */
	int has_erp_value;
	u8 erp_value;
};


typedef enum {
	TXRX_CONTINUE, TXRX_DROP, TXRX_QUEUED
} ieee80211_txrx_result;

/* flags used in struct ieee80211_txrx_data.flags */
/* whether the MSDU was fragmented */
#define IEEE80211_TXRXD_FRAGMENTED		BIT(0)
#define IEEE80211_TXRXD_TXUNICAST		BIT(1)
#define IEEE80211_TXRXD_TXPS_BUFFERED		BIT(2)
#define IEEE80211_TXRXD_TXPROBE_LAST_FRAG	BIT(3)
#define IEEE80211_TXRXD_RXIN_SCAN		BIT(4)
/* frame is destined to interface currently processed (incl. multicast frames) */
#define IEEE80211_TXRXD_RXRA_MATCH		BIT(5)
#define IEEE80211_TXRXD_TX_INJECTED		BIT(6)
struct ieee80211_txrx_data {
	struct sk_buff *skb;
	struct net_device *dev;
	struct ieee80211_local *local;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	u16 fc, ethertype;
	struct ieee80211_key *key;
	unsigned int flags;
	union {
		struct {
			struct ieee80211_tx_control *control;
			struct ieee80211_hw_mode *mode;
			struct ieee80211_rate *rate;
			/* use this rate (if set) for last fragment; rate can
			 * be set to lower rate for the first fragments, e.g.,
			 * when using CTS protection with IEEE 802.11g. */
			struct ieee80211_rate *last_frag_rate;
			int last_frag_hwrate;

			/* Extra fragments (in addition to the first fragment
			 * in skb) */
			int num_extra_frag;
			struct sk_buff **extra_frag;
		} tx;
		struct {
			struct ieee80211_rx_status *status;
			int sent_ps_buffered;
			int queue;
			int load;
			u32 tkip_iv32;
			u16 tkip_iv16;
		} rx;
	} u;
};

/* flags used in struct ieee80211_tx_packet_data.flags */
#define IEEE80211_TXPD_REQ_TX_STATUS	BIT(0)
#define IEEE80211_TXPD_DO_NOT_ENCRYPT	BIT(1)
#define IEEE80211_TXPD_REQUEUE		BIT(2)
/* Stored in sk_buff->cb */
struct ieee80211_tx_packet_data {
	int ifindex;
	unsigned long jiffies;
	unsigned int flags;
	u8 queue;
};

struct ieee80211_tx_stored_packet {
	struct ieee80211_tx_control control;
	struct sk_buff *skb;
	int num_extra_frag;
	struct sk_buff **extra_frag;
	int last_frag_rateidx;
	int last_frag_hwrate;
	struct ieee80211_rate *last_frag_rate;
	unsigned int last_frag_rate_ctrl_probe;
};

typedef ieee80211_txrx_result (*ieee80211_tx_handler)
(struct ieee80211_txrx_data *tx);

typedef ieee80211_txrx_result (*ieee80211_rx_handler)
(struct ieee80211_txrx_data *rx);

struct ieee80211_if_ap {
	u8 *beacon_head, *beacon_tail;
	int beacon_head_len, beacon_tail_len;

	struct list_head vlans;

	u8 ssid[IEEE80211_MAX_SSID_LEN];
	size_t ssid_len;

	/* yes, this looks ugly, but guarantees that we can later use
	 * bitmap_empty :)
	 * NB: don't ever use set_bit, use bss_tim_set/bss_tim_clear! */
	u8 tim[sizeof(unsigned long) * BITS_TO_LONGS(IEEE80211_MAX_AID + 1)];
	atomic_t num_sta_ps; /* number of stations in PS mode */
	struct sk_buff_head ps_bc_buf;
	int dtim_period, dtim_count;
	int force_unicast_rateidx; /* forced TX rateidx for unicast frames */
	int max_ratectrl_rateidx; /* max TX rateidx for rate control */
	int num_beacons; /* number of TXed beacon frames for this BSS */
};

struct ieee80211_if_wds {
	u8 remote_addr[ETH_ALEN];
	struct sta_info *sta;
};

struct ieee80211_if_vlan {
	struct ieee80211_sub_if_data *ap;
	struct list_head list;
};

/* flags used in struct ieee80211_if_sta.flags */
#define IEEE80211_STA_SSID_SET		BIT(0)
#define IEEE80211_STA_BSSID_SET		BIT(1)
#define IEEE80211_STA_PREV_BSSID_SET	BIT(2)
#define IEEE80211_STA_AUTHENTICATED	BIT(3)
#define IEEE80211_STA_ASSOCIATED	BIT(4)
#define IEEE80211_STA_PROBEREQ_POLL	BIT(5)
#define IEEE80211_STA_CREATE_IBSS	BIT(6)
#define IEEE80211_STA_MIXED_CELL	BIT(7)
#define IEEE80211_STA_WMM_ENABLED	BIT(8)
#define IEEE80211_STA_AUTO_SSID_SEL	BIT(10)
#define IEEE80211_STA_AUTO_BSSID_SEL	BIT(11)
#define IEEE80211_STA_AUTO_CHANNEL_SEL	BIT(12)
#define IEEE80211_STA_PRIVACY_INVOKED	BIT(13)
struct ieee80211_if_sta {
	enum {
		IEEE80211_DISABLED, IEEE80211_AUTHENTICATE,
		IEEE80211_ASSOCIATE, IEEE80211_ASSOCIATED,
		IEEE80211_IBSS_SEARCH, IEEE80211_IBSS_JOINED
	} state;
	struct timer_list timer;
	struct work_struct work;
	u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
	u8 ssid[IEEE80211_MAX_SSID_LEN];
	size_t ssid_len;
	u8 scan_ssid[IEEE80211_MAX_SSID_LEN];
	size_t scan_ssid_len;
	u16 aid;
	u16 ap_capab, capab;
	u8 *extra_ie; /* to be added to the end of AssocReq */
	size_t extra_ie_len;

	/* The last AssocReq/Resp IEs */
	u8 *assocreq_ies, *assocresp_ies;
	size_t assocreq_ies_len, assocresp_ies_len;

	int auth_tries, assoc_tries;

	unsigned int flags;
#define IEEE80211_STA_REQ_SCAN 0
#define IEEE80211_STA_REQ_AUTH 1
#define IEEE80211_STA_REQ_RUN  2
	unsigned long request;
	struct sk_buff_head skb_queue;

	unsigned long last_probe;

#define IEEE80211_AUTH_ALG_OPEN BIT(0)
#define IEEE80211_AUTH_ALG_SHARED_KEY BIT(1)
#define IEEE80211_AUTH_ALG_LEAP BIT(2)
	unsigned int auth_algs; /* bitfield of allowed auth algs */
	int auth_alg; /* currently used IEEE 802.11 authentication algorithm */
	int auth_transaction;

	unsigned long ibss_join_req;
	struct sk_buff *probe_resp; /* ProbeResp template for IBSS */
	u32 supp_rates_bits;

	int wmm_last_param_set;
};


/* flags used in struct ieee80211_sub_if_data.flags */
#define IEEE80211_SDATA_ALLMULTI	BIT(0)
#define IEEE80211_SDATA_PROMISC		BIT(1)
#define IEEE80211_SDATA_USE_PROTECTION	BIT(2) /* CTS protect ERP frames */
/* use short preamble with IEEE 802.11b: this flag is set when the AP or beacon
 * generator reports that there are no present stations that cannot support short
 * preambles */
#define IEEE80211_SDATA_SHORT_PREAMBLE	BIT(3)
#define IEEE80211_SDATA_USERSPACE_MLME	BIT(4)
struct ieee80211_sub_if_data {
	struct list_head list;
	enum ieee80211_if_types type;

	struct wireless_dev wdev;

	/* keys */
	struct list_head key_list;

	struct net_device *dev;
	struct ieee80211_local *local;

	unsigned int flags;

	int drop_unencrypted;
	int eapol; /* 0 = process EAPOL frames as normal data frames,
		    * 1 = send EAPOL frames through wlan#ap to hostapd
		    *     (default) */
	int ieee802_1x; /* IEEE 802.1X PAE - drop packet to/from unauthorized
			 * port */

	u16 sequence;

	/* Fragment table for host-based reassembly */
	struct ieee80211_fragment_entry	fragments[IEEE80211_FRAGMENT_MAX];
	unsigned int fragment_next;

#define NUM_DEFAULT_KEYS 4
	struct ieee80211_key *keys[NUM_DEFAULT_KEYS];
	struct ieee80211_key *default_key;

	struct ieee80211_if_ap *bss; /* BSS that this device belongs to */

	union {
		struct ieee80211_if_ap ap;
		struct ieee80211_if_wds wds;
		struct ieee80211_if_vlan vlan;
		struct ieee80211_if_sta sta;
	} u;
	int channel_use;
	int channel_use_raw;

#ifdef CONFIG_MAC80211_DEBUGFS
	struct dentry *debugfsdir;
	union {
		struct {
			struct dentry *channel_use;
			struct dentry *drop_unencrypted;
			struct dentry *eapol;
			struct dentry *ieee8021_x;
			struct dentry *state;
			struct dentry *bssid;
			struct dentry *prev_bssid;
			struct dentry *ssid_len;
			struct dentry *aid;
			struct dentry *ap_capab;
			struct dentry *capab;
			struct dentry *extra_ie_len;
			struct dentry *auth_tries;
			struct dentry *assoc_tries;
			struct dentry *auth_algs;
			struct dentry *auth_alg;
			struct dentry *auth_transaction;
			struct dentry *flags;
		} sta;
		struct {
			struct dentry *channel_use;
			struct dentry *drop_unencrypted;
			struct dentry *eapol;
			struct dentry *ieee8021_x;
			struct dentry *num_sta_ps;
			struct dentry *dtim_period;
			struct dentry *dtim_count;
			struct dentry *num_beacons;
			struct dentry *force_unicast_rateidx;
			struct dentry *max_ratectrl_rateidx;
			struct dentry *num_buffered_multicast;
			struct dentry *beacon_head_len;
			struct dentry *beacon_tail_len;
		} ap;
		struct {
			struct dentry *channel_use;
			struct dentry *drop_unencrypted;
			struct dentry *eapol;
			struct dentry *ieee8021_x;
			struct dentry *peer;
		} wds;
		struct {
			struct dentry *channel_use;
			struct dentry *drop_unencrypted;
			struct dentry *eapol;
			struct dentry *ieee8021_x;
		} vlan;
		struct {
			struct dentry *mode;
		} monitor;
		struct dentry *default_key;
	} debugfs;
#endif
};

#define IEEE80211_DEV_TO_SUB_IF(dev) netdev_priv(dev)

enum {
	IEEE80211_RX_MSG	= 1,
	IEEE80211_TX_STATUS_MSG	= 2,
};

struct ieee80211_local {
	/* embed the driver visible part.
	 * don't cast (use the static inlines below), but we keep
	 * it first anyway so they become a no-op */