path: root/net/wireless/core.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Wireless configuration interface internals.
 *
 * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
 * Copyright (C) 2018-2020 Intel Corporation
 */
#ifndef __NET_WIRELESS_CORE_H
#define __NET_WIRELESS_CORE_H
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/rbtree.h>
#include <linux/debugfs.h>
#include <linux/rfkill.h>
#include <linux/workqueue.h>
#include <linux/rtnetlink.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include "reg.h"


#define WIPHY_IDX_INVALID	-1

struct cfg80211_registered_device {
	const struct cfg80211_ops *ops;
	struct list_head list;

	/* rfkill support */
	struct rfkill_ops rfkill_ops;
	struct rfkill *rfkill;
	struct work_struct rfkill_block;

	/* ISO / IEC 3166 alpha2 for which this device is receiving
	 * country IEs on, this can help disregard country IEs from APs
	 * on the same alpha2 quickly. The alpha2 may differ from
	 * cfg80211_regdomain's alpha2 when an intersection has occurred.
	 * If the AP is reconfigured this can also be used to tell us if
	 * the country on the country IE changed. */
	char country_ie_alpha2[2];

	/*
	 * the driver requests the regulatory core to set this regulatory
	 * domain as the wiphy's. Only used for %REGULATORY_WIPHY_SELF_MANAGED
	 * devices using the regulatory_set_wiphy_regd() API
	 */
	const struct ieee80211_regdomain *requested_regd;

	/* If a Country IE has been received this tells us the environment
	 * which its telling us its in. This defaults to ENVIRON_ANY */
	enum environment_cap env;

	/* wiphy index, internal only */
	int wiphy_idx;

	/* protected by RTNL */
	int devlist_generation, wdev_id;
	int opencount;
	wait_queue_head_t dev_wait;

	struct list_head beacon_registrations;
	spinlock_t beacon_registrations_lock;

	/* protected by RTNL only */
	int num_running_ifaces;
	int num_running_monitor_ifaces;
	u64 cookie_counter;

	/* BSSes/scanning */
	spinlock_t bss_lock;
	struct list_head bss_list;
	struct rb_root bss_tree;
	u32 bss_generation;
	u32 bss_entries;
	struct cfg80211_scan_request *scan_req; /* protected by RTNL */
	struct cfg80211_scan_request *int_scan_req;
	struct sk_buff *scan_msg;
	struct list_head sched_scan_req_list;
	time64_t suspend_at;
	struct work_struct scan_done_wk;

	struct genl_info *cur_cmd_info;

	struct work_struct conn_work;
	struct work_struct event_work;

	struct delayed_work dfs_update_channels_wk;

	/* netlink port which started critical protocol (0 means not started) */
	u32 crit_proto_nlportid;

	struct cfg80211_coalesce *coalesce;

	struct work_struct destroy_work;
	struct work_struct sched_scan_stop_wk;
	struct work_struct sched_scan_res_wk;

	struct cfg80211_chan_def radar_chandef;
	struct work_struct propagate_radar_detect_wk;

	struct cfg80211_chan_def cac_done_chandef;
	struct work_struct propagate_cac_done_wk;

	struct work_struct mgmt_registrations_update_wk;

	/* must be last because of the way we do wiphy_priv(),
	 * and it should at least be aligned to NETDEV_ALIGN */
	struct wiphy wiphy __aligned(NETDEV_ALIGN);
};

static inline
struct cfg80211_registered_device *wiphy_to_rdev(struct wiphy *wiphy)
{
	BUG_ON(!wiphy);
	return container_of(wiphy, struct cfg80211_registered_device, wiphy);
}

static inline void
cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
{
#ifdef CONFIG_PM
	int i;

	if (!rdev->wiphy.wowlan_config)
		return;
	for (i = 0; i < rdev->wiphy.wowlan_config->n_patterns; i++)
		kfree(rdev->wiphy.wowlan_config->patterns[i].mask);
	kfree(rdev->wiphy.wowlan_config->patterns);
	if (rdev->wiphy.wowlan_config->tcp &&
	    rdev->wiphy.wowlan_config->tcp->sock)
		sock_release(rdev->wiphy.wowlan_config->tcp->sock);
	kfree(rdev->wiphy.wowlan_config->tcp);
	kfree(rdev->wiphy.wowlan_config->nd_config);
	kfree(rdev->wiphy.wowlan_config);
#endif
}

static inline u64 cfg80211_assign_cookie(struct cfg80211_registered_device *rdev)
{
	u64 r = ++rdev->cookie_counter;

	if (WARN_ON(r == 0))
		r = ++rdev->cookie_counter;

	return r;
}

extern struct workqueue_struct *cfg80211_wq;
extern struct list_head cfg80211_rdev_list;
extern int cfg80211_rdev_list_generation;

struct cfg80211_internal_bss {
	struct list_head list;
	struct list_head hidden_list;
	struct rb_node rbn;
	u64 ts_boottime;
	unsigned long ts;
	unsigned long refcount;
	atomic_t hold;

	/* time at the start of the reception of the first octet of the
	 * timestamp field of the last beacon/probe received for this BSS.
	 * The time is the TSF of the BSS specified by %parent_bssid.
	 */
	u64 parent_tsf;

	/* the BSS according to which %parent_tsf is set. This is set to
	 * the BSS that the interface that requested the scan was connected to
	 * when the beacon/probe was received.
	 */
	u8 parent_bssid[ETH_ALEN] __aligned(2);

	/* must be last because of priv member */
	struct cfg80211_bss pub;
};

static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
{
	return container_of(pub, struct cfg80211_internal_bss, pub);
}

static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
{
	atomic_inc(&bss->hold);
	if (bss->pub.transmitted_bss) {
		bss = container_of(bss->pub.transmitted_bss,
				   struct cfg80211_internal_bss, pub);
		atomic_inc(&bss->hold);
	}
}

static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
{
	int r = atomic_dec_return(&bss->hold);
	WARN_ON(r < 0);
	if (bss->pub.transmitted_bss) {
		bss = container_of(bss->pub.transmitted_bss,
				   struct cfg80211_internal_bss, pub);
		r = atomic_dec_return(&bss->hold);
		WARN_ON(r < 0);
	}
}


struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
int get_wiphy_idx(struct wiphy *wiphy);

struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);

int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
			  struct net *net);

void cfg80211_init_wdev(struct wireless_dev *wdev);
void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
			    struct wireless_dev *wdev);

static inline void wdev_lock(struct wireless_dev *wdev)
	__acquires(wdev)
{
	mutex_lock(&wdev->mtx);
	__acquire(wdev->mtx);
}

static inline void wdev_unlock(struct wireless_dev *wdev)
	__releases(wdev)
{
	__release(wdev->mtx);
	mutex_unlock(&wdev->mtx);
}

#define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)

static inline bool cfg80211_has_monitors_only(struct cfg80211_registered_device *rdev)
{
	ASSERT_RTNL();

	return rdev->num_running_ifaces == rdev->num_running_monitor_ifaces &&
	       rdev->num_running_ifaces > 0;
}

enum cfg80211_event_type {
	EVENT_CONNECT_RESULT,
	EVENT_ROAMED,
	EVENT_DISCONNECTED,
	EVENT_IBSS_JOINED,
	EVENT_STOPPED,
	EVENT_PORT_AUTHORIZED,
};

struct cfg80211_event {
	struct list_head list;
	enum cfg80211_event_type type;

	union {
		struct cfg80211_connect_resp_params cr;
		struct cfg80211_roam_info rm;
		struct {
			const u8 *ie;
			size_t ie_len;
			u16 reason;
			bool locally_generated;
		} dc;
		struct {
			u8 bssid[ETH_ALEN];
			struct ieee80211_channel *channel;
		} ij;
		struct {
			u8 bssid[ETH_ALEN];
		} pa;
	};
};

struct cfg80211_cached_keys {
	struct key_params params[CFG80211_MAX_WEP_KEYS];
	u8 data[CFG80211_MAX_WEP_KEYS][WLAN_KEY_LEN_WEP104];
	int def;
};

enum cfg80211_chan_mode {
	CHAN_MODE_UNDEFINED,
	CHAN_MODE_SHARED,
	CHAN_MODE_EXCLUSIVE,
}