rndis_wlan.c

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/*
 * Driver for RNDIS based wireless USB devices.
 *
 * Copyright (C) 2007 by Bjorge Dijkstra <[email protected]>
 * Copyright (C) 2008-2009 by Jussi Kivilinna <[email protected]>
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Portions of this file are based on NDISwrapper project,
 *  Copyright (C) 2003-2005 Pontus Fuchs, Giridhar Pemmasani
 *  http://ndiswrapper.sourceforge.net/
 */

// #define  DEBUG           // error path messages, extra info
// #define  VERBOSE         // more; success messages

#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/ieee80211.h>
#include <linux/if_arp.h>
#include <linux/ctype.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <net/cfg80211.h>
#include <linux/usb/usbnet.h>
#include <linux/usb/rndis_host.h>


/* NOTE: All these are settings for Broadcom chipset */
static char modparam_country[4] = "EU";
module_param_string(country, modparam_country, 4, 0444);
MODULE_PARM_DESC(country, "Country code (ISO 3166-1 alpha-2), default: EU");

static int modparam_frameburst = 1;
module_param_named(frameburst, modparam_frameburst, int, 0444);
MODULE_PARM_DESC(frameburst, "enable frame bursting (default: on)");

static int modparam_afterburner = 0;
module_param_named(afterburner, modparam_afterburner, int, 0444);
MODULE_PARM_DESC(afterburner,
    "enable afterburner aka '125 High Speed Mode' (default: off)");

static int modparam_power_save = 0;
module_param_named(power_save, modparam_power_save, int, 0444);
MODULE_PARM_DESC(power_save,
    "set power save mode: 0=off, 1=on, 2=fast (default: off)");

static int modparam_power_output = 3;
module_param_named(power_output, modparam_power_output, int, 0444);
MODULE_PARM_DESC(power_output,
    "set power output: 0=25%, 1=50%, 2=75%, 3=100% (default: 100%)");

static int modparam_roamtrigger = -70;
module_param_named(roamtrigger, modparam_roamtrigger, int, 0444);
MODULE_PARM_DESC(roamtrigger,
    "set roaming dBm trigger: -80=optimize for distance, "
                "-60=bandwidth (default: -70)");

static int modparam_roamdelta = 1;
module_param_named(roamdelta, modparam_roamdelta, int, 0444);
MODULE_PARM_DESC(roamdelta,
    "set roaming tendency: 0=aggressive, 1=moderate, "
                "2=conservative (default: moderate)");

static int modparam_workaround_interval;
module_param_named(workaround_interval, modparam_workaround_interval,
                            int, 0444);
MODULE_PARM_DESC(workaround_interval,
    "set stall workaround interval in msecs (0=disabled) (default: 0)");

/* Typical noise/maximum signal level values taken from ndiswrapper iw_ndis.h */
#define WL_NOISE    -96 /* typical noise level in dBm */
#define WL_SIGMAX   -32 /* typical maximum signal level in dBm */


/* Assume that Broadcom 4320 (only chipset at time of writing known to be
 * based on wireless rndis) has default txpower of 13dBm.
 * This value is from Linksys WUSB54GSC User Guide, Appendix F: Specifications.
 *  100% : 20 mW ~ 13dBm
 *   75% : 15 mW ~ 12dBm
 *   50% : 10 mW ~ 10dBm
 *   25% :  5 mW ~  7dBm
 */
#define BCM4320_DEFAULT_TXPOWER_DBM_100 13
#define BCM4320_DEFAULT_TXPOWER_DBM_75  12
#define BCM4320_DEFAULT_TXPOWER_DBM_50  10
#define BCM4320_DEFAULT_TXPOWER_DBM_25  7

/* Known device types */
#define RNDIS_UNKNOWN   0
#define RNDIS_BCM4320A  1
#define RNDIS_BCM4320B  2


/* NDIS data structures. Taken from wpa_supplicant driver_ndis.c
 * slightly modified for datatype endianess, etc
 */
#define NDIS_802_11_LENGTH_SSID 32
#define NDIS_802_11_LENGTH_RATES 8
#define NDIS_802_11_LENGTH_RATES_EX 16

enum ndis_80211_net_type {
    NDIS_80211_TYPE_FREQ_HOP,
    NDIS_80211_TYPE_DIRECT_SEQ,
    NDIS_80211_TYPE_OFDM_A,
    NDIS_80211_TYPE_OFDM_G
};

enum ndis_80211_net_infra {
    NDIS_80211_INFRA_ADHOC,
    NDIS_80211_INFRA_INFRA,
    NDIS_80211_INFRA_AUTO_UNKNOWN
};

enum ndis_80211_auth_mode {
    NDIS_80211_AUTH_OPEN,
    NDIS_80211_AUTH_SHARED,
    NDIS_80211_AUTH_AUTO_SWITCH,
    NDIS_80211_AUTH_WPA,
    NDIS_80211_AUTH_WPA_PSK,
    NDIS_80211_AUTH_WPA_NONE,
    NDIS_80211_AUTH_WPA2,
    NDIS_80211_AUTH_WPA2_PSK
};

enum ndis_80211_encr_status {
    NDIS_80211_ENCR_WEP_ENABLED,
    NDIS_80211_ENCR_DISABLED,
    NDIS_80211_ENCR_WEP_KEY_ABSENT,
    NDIS_80211_ENCR_NOT_SUPPORTED,
    NDIS_80211_ENCR_TKIP_ENABLED,
    NDIS_80211_ENCR_TKIP_KEY_ABSENT,
    NDIS_80211_ENCR_CCMP_ENABLED,
    NDIS_80211_ENCR_CCMP_KEY_ABSENT
};

enum ndis_80211_priv_filter {
    NDIS_80211_PRIV_ACCEPT_ALL,
    NDIS_80211_PRIV_8021X_WEP
};

enum ndis_80211_status_type {
    NDIS_80211_STATUSTYPE_AUTHENTICATION,
    NDIS_80211_STATUSTYPE_MEDIASTREAMMODE,
    NDIS_80211_STATUSTYPE_PMKID_CANDIDATELIST,
    NDIS_80211_STATUSTYPE_RADIOSTATE,
};

enum ndis_80211_media_stream_mode {
    NDIS_80211_MEDIA_STREAM_OFF,
    NDIS_80211_MEDIA_STREAM_ON
};

enum ndis_80211_radio_status {
    NDIS_80211_RADIO_STATUS_ON,
    NDIS_80211_RADIO_STATUS_HARDWARE_OFF,
    NDIS_80211_RADIO_STATUS_SOFTWARE_OFF,
};

enum ndis_80211_addkey_bits {
    NDIS_80211_ADDKEY_8021X_AUTH = cpu_to_le32(1 << 28),
    NDIS_80211_ADDKEY_SET_INIT_RECV_SEQ = cpu_to_le32(1 << 29),
    NDIS_80211_ADDKEY_PAIRWISE_KEY = cpu_to_le32(1 << 30),
    NDIS_80211_ADDKEY_TRANSMIT_KEY = cpu_to_le32(1 << 31)
};

enum ndis_80211_addwep_bits {
    NDIS_80211_ADDWEP_PERCLIENT_KEY = cpu_to_le32(1 << 30),
    NDIS_80211_ADDWEP_TRANSMIT_KEY = cpu_to_le32(1 << 31)
};

enum ndis_80211_power_mode {
    NDIS_80211_POWER_MODE_CAM,
    NDIS_80211_POWER_MODE_MAX_PSP,
    NDIS_80211_POWER_MODE_FAST_PSP,
};

enum ndis_80211_pmkid_cand_list_flag_bits {
    NDIS_80211_PMKID_CAND_PREAUTH = cpu_to_le32(1 << 0)
};

struct ndis_80211_auth_request {
    __le32 length;
    u8 bssid[6];
    u8 padding[2];
    __le32 flags;
} __packed;

struct ndis_80211_pmkid_candidate {
    u8 bssid[6];
    u8 padding[2];
    __le32 flags;
} __packed;

struct ndis_80211_pmkid_cand_list {
    __le32 version;
    __le32 num_candidates;
    struct ndis_80211_pmkid_candidate candidate_list[0];
} __packed;

struct ndis_80211_status_indication {
    __le32 status_type;
    union {
        __le32                  media_stream_mode;
        __le32                  radio_status;
        struct ndis_80211_auth_request      auth_request[0];
        struct ndis_80211_pmkid_cand_list   cand_list;
    } u;
} __packed;

struct ndis_80211_ssid {
    __le32 length;
    u8 essid[NDIS_802_11_LENGTH_SSID];
} __packed;

struct ndis_80211_conf_freq_hop {
    __le32 length;
    __le32 hop_pattern;
    __le32 hop_set;
    __le32 dwell_time;
} __packed;

struct ndis_80211_conf {
    __le32 length;
    __le32 beacon_period;
    __le32 atim_window;
    __le32 ds_config;
    struct ndis_80211_conf_freq_hop fh_config;
} __packed;

struct ndis_80211_bssid_ex {
    __le32 length;
    u8 mac[6];
    u8 padding[2];
    struct ndis_80211_ssid ssid;
    __le32 privacy;
    __le32 rssi;
    __le32 net_type;
    struct ndis_80211_conf config;
    __le32 net_infra;
    u8 rates[NDIS_802_11_LENGTH_RATES_EX];
    __le32 ie_length;
    u8 ies[0];
} __packed;

struct ndis_80211_bssid_list_ex {
    __le32 num_items;
    struct ndis_80211_bssid_ex bssid[0];
} __packed;

struct ndis_80211_fixed_ies {
    u8 timestamp[8];
    __le16 beacon_interval;
    __le16 capabilities;
} __packed;

struct ndis_80211_wep_key {
    __le32 size;
    __le32 index;
    __le32 length;
    u8 material[32];
} __packed;

struct ndis_80211_key {
    __le32 size;
    __le32 index;
    __le32 length;
    u8 bssid[6];
    u8 padding[6];
    u8 rsc[8];
    u8 material[32];
} __packed;

struct ndis_80211_remove_key {
    __le32 size;
    __le32 index;
    u8 bssid[6];
    u8 padding[2];
} __packed;

struct ndis_config_param {
    __le32 name_offs;
    __le32 name_length;
    __le32 type;
    __le32 value_offs;
    __le32 value_length;
} __packed;

struct ndis_80211_assoc_info {
    __le32 length;
    __le16 req_ies;
    struct req_ie {
        __le16 capa;
        __le16 listen_interval;
        u8 cur_ap_address[6];
    } req_ie;
    __le32 req_ie_length;
    __le32 offset_req_ies;
    __le16 resp_ies;
    struct resp_ie {
        __le16 capa;
        __le16 status_code;
        __le16 assoc_id;
    } resp_ie;
    __le32 resp_ie_length;
    __le32 offset_resp_ies;
} __packed;

struct ndis_80211_auth_encr_pair {
    __le32 auth_mode;
    __le32 encr_mode;
} __packed;

struct ndis_80211_capability {
    __le32 length;
    __le32 version;
    __le32 num_pmkids;
    __le32 num_auth_encr_pair;
    struct ndis_80211_auth_encr_pair auth_encr_pair[0];
} __packed;

struct ndis_80211_bssid_info {
    u8 bssid[6];
    u8 pmkid[16];
} __packed;

struct ndis_80211_pmkid {
    __le32 length;
    __le32 bssid_info_count;
    struct ndis_80211_bssid_info bssid_info[0];
} __packed;

/*
 *  private data
 */
#define CAP_MODE_80211A     1
#define CAP_MODE_80211B     2
#define CAP_MODE_80211G     4
#define CAP_MODE_MASK       7

#define WORK_LINK_UP        (1<<0)
#define WORK_LINK_DOWN      (1<<1)
#define WORK_SET_MULTICAST_LIST (1<<2)

#define RNDIS_WLAN_ALG_NONE 0
#define RNDIS_WLAN_ALG_WEP  (1<<0)
#define RNDIS_WLAN_ALG_TKIP (1<<1)
#define RNDIS_WLAN_ALG_CCMP (1<<2)

#define RNDIS_WLAN_NUM_KEYS     4
#define RNDIS_WLAN_KEY_MGMT_NONE    0
#define RNDIS_WLAN_KEY_MGMT_802_1X  (1<<0)
#define RNDIS_WLAN_KEY_MGMT_PSK     (1<<1)

#define COMMAND_BUFFER_SIZE (CONTROL_BUFFER_SIZE + sizeof(struct rndis_set))

static const struct ieee80211_channel rndis_channels[] = {
    { .center_freq = 2412 },
    { .center_freq = 2417 },
    { .center_freq = 2422 },
    { .center_freq = 2427 },
    { .center_freq = 2432 },
    { .center_freq = 2437 },
    { .center_freq = 2442 },
    { .center_freq = 2447 },
    { .center_freq = 2452 },
    { .center_freq = 2457 },
    { .center_freq = 2462 },
    { .center_freq = 2467 },
    { .center_freq = 2472 },
    { .center_freq = 2484 },
};

static const struct ieee80211_rate rndis_rates[] = {
    { .bitrate = 10 },
    { .bitrate = 20, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 55, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 110, .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 60 },
    { .bitrate = 90 },
    { .bitrate = 120 },
    { .bitrate = 180 },
    { .bitrate = 240 },
    { .bitrate = 360 },
    { .bitrate = 480 },
    { .bitrate = 540 }
};

static const u32 rndis_cipher_suites[] = {
    WLAN_CIPHER_SUITE_WEP40,
    WLAN_CIPHER_SUITE_WEP104,
    WLAN_CIPHER_SUITE_TKIP,
    WLAN_CIPHER_SUITE_CCMP,
};

struct rndis_wlan_encr_key {
    int len;
    u32 cipher;
    u8 material[32];
    u8 bssid[ETH_ALEN];
    bool pairwise;
    bool tx_key;
};

/* RNDIS device private data */
struct rndis_wlan_private {
    struct usbnet *usbdev;

    struct wireless_dev wdev;

    struct cfg80211_scan_request *scan_request;

    struct workqueue_struct *workqueue;
    struct delayed_work dev_poller_work;
    struct delayed_work scan_work;
    struct work_struct work;
    struct mutex command_lock;
    unsigned long work_pending;
    int last_qual;
    s32 cqm_rssi_thold;
    u32 cqm_rssi_hyst;
    int last_cqm_event_rssi;

    struct ieee80211_supported_band band;
    struct ieee80211_channel channels[ARRAY_SIZE(rndis_channels)];
    struct ieee80211_rate rates[ARRAY_SIZE(rndis_rates)];
    u32 cipher_suites[ARRAY_SIZE(rndis_cipher_suites)];

    int device_type;
    int caps;
    int multicast_size;

    /* module parameters */
    char param_country[4];
    int  param_frameburst;
    int  param_afterburner;
    int  param_power_save;
    int  param_power_output;
    int  param_roamtrigger;
    int  param_roamdelta;
    u32  param_workaround_interval;

    /* hardware state */
    bool radio_on;
    int power_mode;
    int infra_mode;
    bool connected;
    u8 bssid[ETH_ALEN];
    u32 current_command_oid;

    /* encryption stuff */
    u8 encr_tx_key_index;
    struct rndis_wlan_encr_key encr_keys[RNDIS_WLAN_NUM_KEYS];
    int  wpa_version;

    u8 command_buffer[COMMAND_BUFFER_SIZE];
};

/*
 * cfg80211 ops
 */
static int rndis_change_virtual_intf(struct wiphy *wiphy,
                    struct net_device *dev,
                    enum nl80211_iftype type, u32 *flags,
                    struct vif_params *params);

static int rndis_scan(struct wiphy *wiphy,
            struct cfg80211_scan_request *request);

static int rndis_set_wiphy_params(struct wiphy *wiphy, u32 changed);

static int rndis_set_tx_power(struct wiphy *wiphy,
                  enum nl80211_tx_power_setting type,
                  int mbm);
static int rndis_get_tx_power(struct wiphy *wiphy, int *dbm);

static int rndis_connect(struct wiphy *wiphy, struct net_device *dev,
                struct cfg80211_connect_params *sme);

static int rndis_disconnect(struct wiphy *wiphy, struct net_device *dev,
                u16 reason_code);

static int rndis_join_ibss(struct wiphy *wiphy, struct net_device *dev,
                    struct cfg80211_ibss_params *params);

static int rndis_leave_ibss(struct wiphy *wiphy, struct net_device *dev);

static int rndis_add_key(struct wiphy *wiphy, struct net_device *netdev,
             u8 key_index, bool pairwise, const u8 *mac_addr,
             struct key_params *params);

static int rndis_del_key(struct wiphy *wiphy, struct net_device *netdev,
             u8 key_index, bool pairwise, const u8 *mac_addr);

static int rndis_set_default_key(struct wiphy *wiphy, struct net_device *netdev,
                 u8 key_index, bool unicast, bool multicast);

static int rndis_get_station(struct wiphy *wiphy, struct net_device *dev,
                    u8 *mac, struct station_info *sinfo);

static int rndis_dump_station(struct wiphy *wiphy, struct net_device *dev,
                   int idx, u8 *mac, struct station_info *sinfo);

static int rndis_set_pmksa(struct wiphy *wiphy, struct net_device *netdev,
                struct cfg80211_pmksa *pmksa);

static int rndis_del_pmksa(struct wiphy *wiphy, struct net_device *netdev,
                struct cfg80211_pmksa *pmksa);

static int rndis_flush_pmksa(struct wiphy *wiphy, struct net_device *netdev);

static int rndis_set_power_mgmt(struct wiphy *wiphy, struct net_device *dev,
                bool enabled, int timeout);

static int rndis_set_cqm_rssi_config(struct wiphy *wiphy,
                    struct net_device *dev,
                    s32 rssi_thold, u32 rssi_hyst);

static const struct cfg80211_ops rndis_config_ops = {
    .change_virtual_intf = rndis_change_virtual_intf,
    .scan = rndis_scan,
    .set_wiphy_params = rndis_set_wiphy_params,
    .set_tx_power = rndis_set_tx_power,
    .get_tx_power = rndis_get_tx_power,
    .connect = rndis_connect,
    .disconnect = rndis_disconnect,
    .join_ibss = rndis_join_ibss,
    .leave_ibss = rndis_leave_ibss,
    .add_key = rndis_add_key,
    .del_key = rndis_del_key,
    .set_default_key = rndis_set_default_key,
    .get_station = rndis_get_station,
    .dump_station = rndis_dump_station,
    .set_pmksa = rndis_set_pmksa,
    .del_pmksa = rndis_del_pmksa,
    .flush_pmksa = rndis_flush_pmksa,
    .set_power_mgmt = rndis_set_power_mgmt,
    .set_cqm_rssi_config = rndis_set_cqm_rssi_config,
};

static void *rndis_wiphy_privid = &rndis_wiphy_privid;


static struct rndis_wlan_private *get_rndis_wlan_priv(struct usbnet *dev)
{
    return (struct rndis_wlan_private *)dev->driver_priv;
}

static u32 get_bcm4320_power_dbm(struct rndis_wlan_private *priv)
{
    switch (priv->param_power_output) {
    default:
    case 3:
        return BCM4320_DEFAULT_TXPOWER_DBM_100;
    case 2:
        return BCM4320_DEFAULT_TXPOWER_DBM_75;
    case 1:
        return BCM4320_DEFAULT_TXPOWER_DBM_50;
    case 0:
        return BCM4320_DEFAULT_TXPOWER_DBM_25;
    }
}

static bool is_wpa_key(struct rndis_wlan_private *priv, u8 idx)
{
    int cipher = priv->encr_keys[idx].cipher;

    return (cipher == WLAN_CIPHER_SUITE_CCMP ||
        cipher == WLAN_CIPHER_SUITE_TKIP);
}

static int rndis_cipher_to_alg(u32 cipher)
{
    switch (cipher) {
    default:
        return RNDIS_WLAN_ALG_NONE;
    case WLAN_CIPHER_SUITE_WEP40:
    case WLAN_CIPHER_SUITE_WEP104:
        return RNDIS_WLAN_ALG_WEP;
    case WLAN_CIPHER_SUITE_TKIP:
        return RNDIS_WLAN_ALG_TKIP;
    case WLAN_CIPHER_SUITE_CCMP:
        return RNDIS_WLAN_ALG_CCMP;
    }
}

static int rndis_akm_suite_to_key_mgmt(u32 akm_suite)
{
    switch (akm_suite) {
    default:
        return RNDIS_WLAN_KEY_MGMT_NONE;
    case WLAN_AKM_SUITE_8021X:
        return RNDIS_WLAN_KEY_MGMT_802_1X;
    case WLAN_AKM_SUITE_PSK:
        return RNDIS_WLAN_KEY_MGMT_PSK;
    }
}

#ifdef DEBUG
static const char *oid_to_string(u32 oid)
{
    switch (oid) {
#define OID_STR(oid) case oid: return(#oid)
        /* from rndis_host.h */
        OID_STR(RNDIS_OID_802_3_PERMANENT_ADDRESS);
        OID_STR(RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE);
        OID_STR(RNDIS_OID_GEN_CURRENT_PACKET_FILTER);
        OID_STR(RNDIS_OID_GEN_PHYSICAL_MEDIUM);

        /* from rndis_wlan.c */
        OID_STR(RNDIS_OID_GEN_LINK_SPEED);
        OID_STR(RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER);

        OID_STR(RNDIS_OID_GEN_XMIT_OK);
        OID_STR(RNDIS_OID_GEN_RCV_OK);
        OID_STR(RNDIS_OID_GEN_XMIT_ERROR);
        OID_STR(RNDIS_OID_GEN_RCV_ERROR);
        OID_STR(RNDIS_OID_GEN_RCV_NO_BUFFER);

        OID_STR(RNDIS_OID_802_3_CURRENT_ADDRESS);
        OID_STR(RNDIS_OID_802_3_MULTICAST_LIST);
        OID_STR(RNDIS_OID_802_3_MAXIMUM_LIST_SIZE);

        OID_STR(RNDIS_OID_802_11_BSSID);
        OID_STR(RNDIS_OID_802_11_SSID);
        OID_STR(RNDIS_OID_802_11_INFRASTRUCTURE_MODE);
        OID_STR(RNDIS_OID_802_11_ADD_WEP);
        OID_STR(RNDIS_OID_802_11_REMOVE_WEP);
        OID_STR(RNDIS_OID_802_11_DISASSOCIATE);
        OID_STR(RNDIS_OID_802_11_AUTHENTICATION_MODE);
        OID_STR(RNDIS_OID_802_11_PRIVACY_FILTER);
        OID_STR(RNDIS_OID_802_11_BSSID_LIST_SCAN);
        OID_STR(RNDIS_OID_802_11_ENCRYPTION_STATUS);
        OID_STR(RNDIS_OID_802_11_ADD_KEY);
        OID_STR(RNDIS_OID_802_11_REMOVE_KEY);
        OID_STR(RNDIS_OID_802_11_ASSOCIATION_INFORMATION);
        OID_STR(RNDIS_OID_802_11_CAPABILITY);
        OID_STR(RNDIS_OID_802_11_PMKID);
        OID_STR(RNDIS_OID_802_11_NETWORK_TYPES_SUPPORTED);
        OID_STR(RNDIS_OID_802_11_NETWORK_TYPE_IN_USE);
        OID_STR(RNDIS_OID_802_11_TX_POWER_LEVEL);
        OID_STR(RNDIS_OID_802_11_RSSI);
        OID_STR(RNDIS_OID_802_11_RSSI_TRIGGER);
        OID_STR(RNDIS_OID_802_11_FRAGMENTATION_THRESHOLD);
        OID_STR(RNDIS_OID_802_11_RTS_THRESHOLD);
        OID_STR(RNDIS_OID_802_11_SUPPORTED_RATES);
        OID_STR(RNDIS_OID_802_11_CONFIGURATION);
        OID_STR(RNDIS_OID_802_11_POWER_MODE);
        OID_STR(RNDIS_OID_802_11_BSSID_LIST);
#undef OID_STR
    }

    return "?";
}
#else
static const char *oid_to_string(u32 oid)
{
    return "?";
}
#endif

/* translate error code */
static int rndis_error_status(__le32 rndis_status)
{
    int ret = -EINVAL;
    switch (le32_to_cpu(rndis_status)) {
    case RNDIS_STATUS_SUCCESS:
        ret = 0;
        break;
    case RNDIS_STATUS_FAILURE:
    case RNDIS_STATUS_INVALID_DATA:
        ret = -EINVAL;
        break;
    case RNDIS_STATUS_NOT_SUPPORTED:
        ret = -EOPNOTSUPP;
        break;
    case RNDIS_STATUS_ADAPTER_NOT_READY:
    case RNDIS_STATUS_ADAPTER_NOT_OPEN:
        ret = -EBUSY;
        break;
    }
    return ret;
}

static int rndis_query_oid(struct usbnet *dev, u32 oid, void *data, int *len)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(dev);
    union {
        void            *buf;
        struct rndis_msg_hdr    *header;
        struct rndis_query  *get;
        struct rndis_query_c    *get_c;
    } u;
    int ret, buflen;
    int resplen, respoffs, copylen;

    buflen = *len + sizeof(*u.get);
    if (buflen < CONTROL_BUFFER_SIZE)
        buflen = CONTROL_BUFFER_SIZE;

    if (buflen > COMMAND_BUFFER_SIZE) {
        u.buf = kmalloc(buflen, GFP_KERNEL);
        if (!u.buf)
            return -ENOMEM;
    } else {
        u.buf = priv->command_buffer;
    }

    mutex_lock(&priv->command_lock);

    memset(u.get, 0, sizeof *u.get);
    u.get->msg_type = cpu_to_le32(RNDIS_MSG_QUERY);
    u.get->msg_len = cpu_to_le32(sizeof *u.get);
    u.get->oid = cpu_to_le32(oid);

    priv->current_command_oid = oid;
    ret = rndis_command(dev, u.header, buflen);
    priv->current_command_oid = 0;
    if (ret < 0)
        netdev_dbg(dev->net, "%s(%s): rndis_command() failed, %d (%08x)\n",
               __func__, oid_to_string(oid), ret,
               le32_to_cpu(u.get_c->status));

    if (ret == 0) {
        resplen = le32_to_cpu(u.get_c->len);
        respoffs = le32_to_cpu(u.get_c->offset) + 8;

        if (respoffs > buflen) {
            /* Device returned data offset outside buffer, error. */
            netdev_dbg(dev->net, "%s(%s): received invalid "
                "data offset: %d > %d\n", __func__,
                oid_to_string(oid), respoffs, buflen);

            ret = -EINVAL;
            goto exit_unlock;
        }

        if ((resplen + respoffs) > buflen) {
            /* Device would have returned more data if buffer would
             * have been big enough. Copy just the bits that we got.
             */
            copylen = buflen - respoffs;
        } else {
            copylen = resplen;
        }

        if (copylen > *len)
            copylen = *len;

        memcpy(data, u.buf + respoffs, copylen);

        *len = resplen;

        ret = rndis_error_status(u.get_c->status);
        if (ret < 0)
            netdev_dbg(dev->net, "%s(%s): device returned error,  0x%08x (%d)\n",
                   __func__, oid_to_string(oid),
                   le32_to_cpu(u.get_c->status), ret);
    }

exit_unlock:
    mutex_unlock(&priv->command_lock);

    if (u.buf != priv->command_buffer)
        kfree(u.buf);
    return ret;
}

static int rndis_set_oid(struct usbnet *dev, u32 oid, const void *data,
             int len)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(dev);
    union {
        void            *buf;
        struct rndis_msg_hdr    *header;
        struct rndis_set    *set;
        struct rndis_set_c  *set_c;
    } u;
    int ret, buflen;

    buflen = len + sizeof(*u.set);
    if (buflen < CONTROL_BUFFER_SIZE)
        buflen = CONTROL_BUFFER_SIZE;

    if (buflen > COMMAND_BUFFER_SIZE) {
        u.buf = kmalloc(buflen, GFP_KERNEL);
        if (!u.buf)
            return -ENOMEM;
    } else {
        u.buf = priv->command_buffer;
    }

    mutex_lock(&priv->command_lock);

    memset(u.set, 0, sizeof *u.set);
    u.set->msg_type = cpu_to_le32(RNDIS_MSG_SET);
    u.set->msg_len = cpu_to_le32(sizeof(*u.set) + len);
    u.set->oid = cpu_to_le32(oid);
    u.set->len = cpu_to_le32(len);
    u.set->offset = cpu_to_le32(sizeof(*u.set) - 8);
    u.set->handle = cpu_to_le32(0);
    memcpy(u.buf + sizeof(*u.set), data, len);

    priv->current_command_oid = oid;
    ret = rndis_command(dev, u.header, buflen);
    priv->current_command_oid = 0;
    if (ret < 0)
        netdev_dbg(dev->net, "%s(%s): rndis_command() failed, %d (%08x)\n",
               __func__, oid_to_string(oid), ret,
               le32_to_cpu(u.set_c->status));

    if (ret == 0) {
        ret = rndis_error_status(u.set_c->status);

        if (ret < 0)
            netdev_dbg(dev->net, "%s(%s): device returned error, 0x%08x (%d)\n",
                   __func__, oid_to_string(oid),
                   le32_to_cpu(u.set_c->status), ret);
    }

    mutex_unlock(&priv->command_lock);

    if (u.buf != priv->command_buffer)
        kfree(u.buf);
    return ret;
}

static int rndis_reset(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct rndis_reset *reset;
    int ret;

    mutex_lock(&priv->command_lock);

    reset = (void *)priv->command_buffer;
    memset(reset, 0, sizeof(*reset));
    reset->msg_type = cpu_to_le32(RNDIS_MSG_RESET);
    reset->msg_len = cpu_to_le32(sizeof(*reset));
    priv->current_command_oid = 0;
    ret = rndis_command(usbdev, (void *)reset, CONTROL_BUFFER_SIZE);

    mutex_unlock(&priv->command_lock);

    if (ret < 0)
        return ret;
    return 0;
}

/*
 * Specs say that we can only set config parameters only soon after device
 * initialization.
 *   value_type: 0 = u32, 2 = unicode string
 */
static int rndis_set_config_parameter(struct usbnet *dev, char *param,
                        int value_type, void *value)
{
    struct ndis_config_param *infobuf;
    int value_len, info_len, param_len, ret, i;
    __le16 *unibuf;
    __le32 *dst_value;

    if (value_type == 0)
        value_len = sizeof(__le32);
    else if (value_type == 2)
        value_len = strlen(value) * sizeof(__le16);
    else
        return -EINVAL;

    param_len = strlen(param) * sizeof(__le16);
    info_len = sizeof(*infobuf) + param_len + value_len;

#ifdef DEBUG
    info_len += 12;
#endif
    infobuf = kmalloc(info_len, GFP_KERNEL);
    if (!infobuf)
        return -ENOMEM;

#ifdef DEBUG
    info_len -= 12;
    /* extra 12 bytes are for padding (debug output) */
    memset(infobuf, 0xCC, info_len + 12);
#endif

    if (value_type == 2)
        netdev_dbg(dev->net, "setting config parameter: %s, value: %s\n",
               param, (u8 *)value);
    else
        netdev_dbg(dev->net, "setting config parameter: %s, value: %d\n",
               param, *(u32 *)value);

    infobuf->name_offs = cpu_to_le32(sizeof(*infobuf));
    infobuf->name_length = cpu_to_le32(param_len);
    infobuf->type = cpu_to_le32(value_type);
    infobuf->value_offs = cpu_to_le32(sizeof(*infobuf) + param_len);
    infobuf->value_length = cpu_to_le32(value_len);

    /* simple string to unicode string conversion */
    unibuf = (void *)infobuf + sizeof(*infobuf);
    for (i = 0; i < param_len / sizeof(__le16); i++)
        unibuf[i] = cpu_to_le16(param[i]);

    if (value_type == 2) {
        unibuf = (void *)infobuf + sizeof(*infobuf) + param_len;
        for (i = 0; i < value_len / sizeof(__le16); i++)
            unibuf[i] = cpu_to_le16(((u8 *)value)[i]);
    } else {
        dst_value = (void *)infobuf + sizeof(*infobuf) + param_len;
        *dst_value = cpu_to_le32(*(u32 *)value);
    }

#ifdef DEBUG
    netdev_dbg(dev->net, "info buffer (len: %d)\n", info_len);
    for (i = 0; i < info_len; i += 12) {
        u32 *tmp = (u32 *)((u8 *)infobuf + i);
        netdev_dbg(dev->net, "%08X:%08X:%08X\n",
               cpu_to_be32(tmp[0]),
               cpu_to_be32(tmp[1]),
               cpu_to_be32(tmp[2]));
    }
#endif

    ret = rndis_set_oid(dev, RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER,
                            infobuf, info_len);
    if (ret != 0)
        netdev_dbg(dev->net, "setting rndis config parameter failed, %d\n",
               ret);

    kfree(infobuf);
    return ret;
}

static int rndis_set_config_parameter_str(struct usbnet *dev,
                        char *param, char *value)
{
    return rndis_set_config_parameter(dev, param, 2, value);
}

/*
 * data conversion functions
 */
static int level_to_qual(int level)
{
    int qual = 100 * (level - WL_NOISE) / (WL_SIGMAX - WL_NOISE);
    return qual >= 0 ? (qual <= 100 ? qual : 100) : 0;
}

/*
 * common functions
 */
static int set_infra_mode(struct usbnet *usbdev, int mode);
static void restore_keys(struct usbnet *usbdev);
static int rndis_check_bssid_list(struct usbnet *usbdev, u8 *match_bssid,
                    bool *matched);

static int rndis_start_bssid_list_scan(struct usbnet *usbdev)
{
    __le32 tmp;

    /* Note: RNDIS_OID_802_11_BSSID_LIST_SCAN clears internal BSS list. */
    tmp = cpu_to_le32(1);
    return rndis_set_oid(usbdev, RNDIS_OID_802_11_BSSID_LIST_SCAN, &tmp,
                            sizeof(tmp));
}

static int set_essid(struct usbnet *usbdev, struct ndis_80211_ssid *ssid)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    int ret;

    ret = rndis_set_oid(usbdev, RNDIS_OID_802_11_SSID,
                ssid, sizeof(*ssid));
    if (ret < 0) {
        netdev_warn(usbdev->net, "setting SSID failed (%08X)\n", ret);
        return ret;
    }
    if (ret == 0) {
        priv->radio_on = true;
        netdev_dbg(usbdev->net, "%s(): radio_on = true\n", __func__);
    }

    return ret;
}

static int set_bssid(struct usbnet *usbdev, const u8 *bssid)
{
    int ret;

    ret = rndis_set_oid(usbdev, RNDIS_OID_802_11_BSSID,
                bssid, ETH_ALEN);
    if (ret < 0) {
        netdev_warn(usbdev->net, "setting BSSID[%pM] failed (%08X)\n",
                bssid, ret);
        return ret;
    }

    return ret;
}

static int clear_bssid(struct usbnet *usbdev)
{
    static const u8 broadcast_mac[ETH_ALEN] = {
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff
    };

    return set_bssid(usbdev, broadcast_mac);
}

static int get_bssid(struct usbnet *usbdev, u8 bssid[ETH_ALEN])
{
    int ret, len;

    len = ETH_ALEN;
    ret = rndis_query_oid(usbdev, RNDIS_OID_802_11_BSSID,
                  bssid, &len);

    if (ret != 0)
        memset(bssid, 0, ETH_ALEN);

    return ret;
}

static int get_association_info(struct usbnet *usbdev,
            struct ndis_80211_assoc_info *info, int len)
{
    return rndis_query_oid(usbdev,
            RNDIS_OID_802_11_ASSOCIATION_INFORMATION,
            info, &len);
}

static bool is_associated(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    u8 bssid[ETH_ALEN];
    int ret;

    if (!priv->radio_on)
        return false;

    ret = get_bssid(usbdev, bssid);

    return (ret == 0 && !is_zero_ether_addr(bssid));
}

static int disassociate(struct usbnet *usbdev, bool reset_ssid)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct ndis_80211_ssid ssid;
    int i, ret = 0;

    if (priv->radio_on) {
        ret = rndis_set_oid(usbdev,
                RNDIS_OID_802_11_DISASSOCIATE,
                NULL, 0);
        if (ret == 0) {
            priv->radio_on = false;
            netdev_dbg(usbdev->net, "%s(): radio_on = false\n",
                   __func__);

            if (reset_ssid)
                msleep(100);
        }
    }

    /* disassociate causes radio to be turned off; if reset_ssid
     * is given, set random ssid to enable radio */
    if (reset_ssid) {
        /* Set device to infrastructure mode so we don't get ad-hoc
         * 'media connect' indications with the random ssid.
         */
        set_infra_mode(usbdev, NDIS_80211_INFRA_INFRA);

        ssid.length = cpu_to_le32(sizeof(ssid.essid));
        get_random_bytes(&ssid.essid[2], sizeof(ssid.essid)-2);
        ssid.essid[0] = 0x1;
        ssid.essid[1] = 0xff;
        for (i = 2; i < sizeof(ssid.essid); i++)
            ssid.essid[i] = 0x1 + (ssid.essid[i] * 0xfe / 0xff);
        ret = set_essid(usbdev, &ssid);
    }
    return ret;
}

static int set_auth_mode(struct usbnet *usbdev, u32 wpa_version,
                enum nl80211_auth_type auth_type, int keymgmt)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    __le32 tmp;
    int auth_mode, ret;

    netdev_dbg(usbdev->net, "%s(): wpa_version=0x%x authalg=0x%x keymgmt=0x%x\n",
           __func__, wpa_version, auth_type, keymgmt);

    if (wpa_version & NL80211_WPA_VERSION_2) {
        if (keymgmt & RNDIS_WLAN_KEY_MGMT_802_1X)
            auth_mode = NDIS_80211_AUTH_WPA2;
        else
            auth_mode = NDIS_80211_AUTH_WPA2_PSK;
    } else if (wpa_version & NL80211_WPA_VERSION_1) {
        if (keymgmt & RNDIS_WLAN_KEY_MGMT_802_1X)
            auth_mode = NDIS_80211_AUTH_WPA;
        else if (keymgmt & RNDIS_WLAN_KEY_MGMT_PSK)
            auth_mode = NDIS_80211_AUTH_WPA_PSK;
        else
            auth_mode = NDIS_80211_AUTH_WPA_NONE;
    } else if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
        auth_mode = NDIS_80211_AUTH_SHARED;
    else if (auth_type == NL80211_AUTHTYPE_OPEN_SYSTEM)
        auth_mode = NDIS_80211_AUTH_OPEN;
    else if (auth_type == NL80211_AUTHTYPE_AUTOMATIC)
        auth_mode = NDIS_80211_AUTH_AUTO_SWITCH;
    else
        return -ENOTSUPP;

    tmp = cpu_to_le32(auth_mode);
    ret = rndis_set_oid(usbdev,
                RNDIS_OID_802_11_AUTHENTICATION_MODE,
                &tmp, sizeof(tmp));
    if (ret != 0) {
        netdev_warn(usbdev->net, "setting auth mode failed (%08X)\n",
                ret);
        return ret;
    }

    priv->wpa_version = wpa_version;

    return 0;
}

static int set_priv_filter(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    __le32 tmp;

    netdev_dbg(usbdev->net, "%s(): wpa_version=0x%x\n",
           __func__, priv->wpa_version);

    if (priv->wpa_version & NL80211_WPA_VERSION_2 ||
        priv->wpa_version & NL80211_WPA_VERSION_1)
        tmp = cpu_to_le32(NDIS_80211_PRIV_8021X_WEP);
    else
        tmp = cpu_to_le32(NDIS_80211_PRIV_ACCEPT_ALL);

    return rndis_set_oid(usbdev,
                 RNDIS_OID_802_11_PRIVACY_FILTER, &tmp,
                 sizeof(tmp));
}

static int set_encr_mode(struct usbnet *usbdev, int pairwise, int groupwise)
{
    __le32 tmp;
    int encr_mode, ret;

    netdev_dbg(usbdev->net, "%s(): cipher_pair=0x%x cipher_group=0x%x\n",
           __func__, pairwise, groupwise);

    if (pairwise & RNDIS_WLAN_ALG_CCMP)
        encr_mode = NDIS_80211_ENCR_CCMP_ENABLED;
    else if (pairwise & RNDIS_WLAN_ALG_TKIP)
        encr_mode = NDIS_80211_ENCR_TKIP_ENABLED;
    else if (pairwise & RNDIS_WLAN_ALG_WEP)
        encr_mode = NDIS_80211_ENCR_WEP_ENABLED;
    else if (groupwise & RNDIS_WLAN_ALG_CCMP)
        encr_mode = NDIS_80211_ENCR_CCMP_ENABLED;
    else if (groupwise & RNDIS_WLAN_ALG_TKIP)
        encr_mode = NDIS_80211_ENCR_TKIP_ENABLED;
    else
        encr_mode = NDIS_80211_ENCR_DISABLED;

    tmp = cpu_to_le32(encr_mode);
    ret = rndis_set_oid(usbdev,
            RNDIS_OID_802_11_ENCRYPTION_STATUS, &tmp,
            sizeof(tmp));
    if (ret != 0) {
        netdev_warn(usbdev->net, "setting encr mode failed (%08X)\n",
                ret);
        return ret;
    }

    return 0;
}

static int set_infra_mode(struct usbnet *usbdev, int mode)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    __le32 tmp;
    int ret;

    netdev_dbg(usbdev->net, "%s(): infra_mode=0x%x\n",
           __func__, priv->infra_mode);

    tmp = cpu_to_le32(mode);
    ret = rndis_set_oid(usbdev,
                RNDIS_OID_802_11_INFRASTRUCTURE_MODE,
                &tmp, sizeof(tmp));
    if (ret != 0) {
        netdev_warn(usbdev->net, "setting infra mode failed (%08X)\n",
                ret);
        return ret;
    }

    /* NDIS drivers clear keys when infrastructure mode is
     * changed. But Linux tools assume otherwise. So set the
     * keys */
    restore_keys(usbdev);

    priv->infra_mode = mode;
    return 0;
}

static int set_rts_threshold(struct usbnet *usbdev, u32 rts_threshold)
{
    __le32 tmp;

    netdev_dbg(usbdev->net, "%s(): %i\n", __func__, rts_threshold);

    if (rts_threshold < 0 || rts_threshold > 2347)
        rts_threshold = 2347;

    tmp = cpu_to_le32(rts_threshold);
    return rndis_set_oid(usbdev,
                 RNDIS_OID_802_11_RTS_THRESHOLD,
                 &tmp, sizeof(tmp));
}

static int set_frag_threshold(struct usbnet *usbdev, u32 frag_threshold)
{
    __le32 tmp;

    netdev_dbg(usbdev->net, "%s(): %i\n", __func__, frag_threshold);

    if (frag_threshold < 256 || frag_threshold > 2346)
        frag_threshold = 2346;

    tmp = cpu_to_le32(frag_threshold);
    return rndis_set_oid(usbdev,
            RNDIS_OID_802_11_FRAGMENTATION_THRESHOLD,
            &tmp, sizeof(tmp));
}

static void set_default_iw_params(struct usbnet *usbdev)
{
    set_infra_mode(usbdev, NDIS_80211_INFRA_INFRA);
    set_auth_mode(usbdev, 0, NL80211_AUTHTYPE_OPEN_SYSTEM,
                        RNDIS_WLAN_KEY_MGMT_NONE);
    set_priv_filter(usbdev);
    set_encr_mode(usbdev, RNDIS_WLAN_ALG_NONE, RNDIS_WLAN_ALG_NONE);
}

static int deauthenticate(struct usbnet *usbdev)
{
    int ret;

    ret = disassociate(usbdev, true);
    set_default_iw_params(usbdev);
    return ret;
}

static int set_channel(struct usbnet *usbdev, int channel)
{
    struct ndis_80211_conf config;
    unsigned int dsconfig;
    int len, ret;

    netdev_dbg(usbdev->net, "%s(%d)\n", __func__, channel);

    /* this OID is valid only when not associated */
    if (is_associated(usbdev))
        return 0;

    dsconfig = ieee80211_dsss_chan_to_freq(channel) * 1000;

    len = sizeof(config);
    ret = rndis_query_oid(usbdev,
            RNDIS_OID_802_11_CONFIGURATION,
            &config, &len);
    if (ret < 0) {
        netdev_dbg(usbdev->net, "%s(): querying configuration failed\n",
               __func__);
        return ret;
    }

    config.ds_config = cpu_to_le32(dsconfig);
    ret = rndis_set_oid(usbdev,
            RNDIS_OID_802_11_CONFIGURATION,
            &config, sizeof(config));

    netdev_dbg(usbdev->net, "%s(): %d -> %d\n", __func__, channel, ret);

    return ret;
}

static struct ieee80211_channel *get_current_channel(struct usbnet *usbdev,
                             u32 *beacon_period)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct ieee80211_channel *channel;
    struct ndis_80211_conf config;
    int len, ret;

    /* Get channel and beacon interval */
    len = sizeof(config);
    ret = rndis_query_oid(usbdev,
            RNDIS_OID_802_11_CONFIGURATION,
            &config, &len);
    netdev_dbg(usbdev->net, "%s(): RNDIS_OID_802_11_CONFIGURATION -> %d\n",
                __func__, ret);
    if (ret < 0)
        return NULL;

    channel = ieee80211_get_channel(priv->wdev.wiphy,
                KHZ_TO_MHZ(le32_to_cpu(config.ds_config)));
    if (!channel)
        return NULL;

    if (beacon_period)
        *beacon_period = le32_to_cpu(config.beacon_period);
    return channel;
}

/* index must be 0 - N, as per NDIS  */
static int add_wep_key(struct usbnet *usbdev, const u8 *key, int key_len,
                                u8 index)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct ndis_80211_wep_key ndis_key;
    u32 cipher;
    int ret;

    netdev_dbg(usbdev->net, "%s(idx: %d, len: %d)\n",
           __func__, index, key_len);

    if (index >= RNDIS_WLAN_NUM_KEYS)
        return -EINVAL;

    if (key_len == 5)
        cipher = WLAN_CIPHER_SUITE_WEP40;
    else if (key_len == 13)
        cipher = WLAN_CIPHER_SUITE_WEP104;
    else
        return -EINVAL;

    memset(&ndis_key, 0, sizeof(ndis_key));

    ndis_key.size = cpu_to_le32(sizeof(ndis_key));
    ndis_key.length = cpu_to_le32(key_len);
    ndis_key.index = cpu_to_le32(index);
    memcpy(&ndis_key.material, key, key_len);

    if (index == priv->encr_tx_key_index) {
        ndis_key.index |= NDIS_80211_ADDWEP_TRANSMIT_KEY;
        ret = set_encr_mode(usbdev, RNDIS_WLAN_ALG_WEP,
                            RNDIS_WLAN_ALG_NONE);
        if (ret)
            netdev_warn(usbdev->net, "encryption couldn't be enabled (%08X)\n",
                    ret);
    }

    ret = rndis_set_oid(usbdev,
            RNDIS_OID_802_11_ADD_WEP, &ndis_key,
            sizeof(ndis_key));
    if (ret != 0) {
        netdev_warn(usbdev->net, "adding encryption key %d failed (%08X)\n",
                index + 1, ret);
        return ret;
    }

    priv->encr_keys[index].len = key_len;
    priv->encr_keys[index].cipher = cipher;
    memcpy(&priv->encr_keys[index].material, key, key_len);
    memset(&priv->encr_keys[index].bssid, 0xff, ETH_ALEN);

    return 0;
}

static int add_wpa_key(struct usbnet *usbdev, const u8 *key, int key_len,
            u8 index, const u8 *addr, const u8 *rx_seq,
            int seq_len, u32 cipher, __le32 flags)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct ndis_80211_key ndis_key;
    bool is_addr_ok;
    int ret;

    if (index >= RNDIS_WLAN_NUM_KEYS) {
        netdev_dbg(usbdev->net, "%s(): index out of range (%i)\n",
               __func__, index);
        return -EINVAL;
    }
    if (key_len > sizeof(ndis_key.material) || key_len < 0) {
        netdev_dbg(usbdev->net, "%s(): key length out of range (%i)\n",
               __func__, key_len);
        return -EINVAL;
    }
    if (flags & NDIS_80211_ADDKEY_SET_INIT_RECV_SEQ) {
        if (!rx_seq || seq_len <= 0) {
            netdev_dbg(usbdev->net, "%s(): recv seq flag without buffer\n",
                   __func__);
            return -EINVAL;
        }
        if (rx_seq && seq_len > sizeof(ndis_key.rsc)) {
            netdev_dbg(usbdev->net, "%s(): too big recv seq buffer\n", __func__);
            return -EINVAL;
        }
    }

    is_addr_ok = addr && !is_zero_ether_addr(addr) &&
                    !is_broadcast_ether_addr(addr);
    if ((flags & NDIS_80211_ADDKEY_PAIRWISE_KEY) && !is_addr_ok) {
        netdev_dbg(usbdev->net, "%s(): pairwise but bssid invalid (%pM)\n",
               __func__, addr);
        return -EINVAL;
    }

    netdev_dbg(usbdev->net, "%s(%i): flags:%i%i%i\n",
           __func__, index,
           !!(flags & NDIS_80211_ADDKEY_TRANSMIT_KEY),
           !!(flags & NDIS_80211_ADDKEY_PAIRWISE_KEY),
           !!(flags & NDIS_80211_ADDKEY_SET_INIT_RECV_SEQ));

    memset(&ndis_key, 0, sizeof(ndis_key));

    ndis_key.size = cpu_to_le32(sizeof(ndis_key) -
                sizeof(ndis_key.material) + key_len);
    ndis_key.length = cpu_to_le32(key_len);
    ndis_key.index = cpu_to_le32(index) | flags;

    if (cipher == WLAN_CIPHER_SUITE_TKIP && key_len == 32) {
        /* wpa_supplicant gives us the Michael MIC RX/TX keys in
         * different order than NDIS spec, so swap the order here. */
        memcpy(ndis_key.material, key, 16);
        memcpy(ndis_key.material + 16, key + 24, 8);
        memcpy(ndis_key.material + 24, key + 16, 8);
    } else
        memcpy(ndis_key.material, key, key_len);

    if (flags & NDIS_80211_ADDKEY_SET_INIT_RECV_SEQ)
        memcpy(ndis_key.rsc, rx_seq, seq_len);

    if (flags & NDIS_80211_ADDKEY_PAIRWISE_KEY) {
        /* pairwise key */
        memcpy(ndis_key.bssid, addr, ETH_ALEN);
    } else {
        /* group key */
        if (priv->infra_mode == NDIS_80211_INFRA_ADHOC)
            memset(ndis_key.bssid, 0xff, ETH_ALEN);
        else
            get_bssid(usbdev, ndis_key.bssid);
    }

    ret = rndis_set_oid(usbdev,
            RNDIS_OID_802_11_ADD_KEY, &ndis_key,
            le32_to_cpu(ndis_key.size));
    netdev_dbg(usbdev->net, "%s(): RNDIS_OID_802_11_ADD_KEY -> %08X\n",
           __func__, ret);
    if (ret != 0)
        return ret;

    memset(&priv->encr_keys[index], 0, sizeof(priv->encr_keys[index]));
    priv->encr_keys[index].len = key_len;
    priv->encr_keys[index].cipher = cipher;
    memcpy(&priv->encr_keys[index].material, key, key_len);
    if (flags & NDIS_80211_ADDKEY_PAIRWISE_KEY)
        memcpy(&priv->encr_keys[index].bssid, ndis_key.bssid, ETH_ALEN);
    else
        memset(&priv->encr_keys[index].bssid, 0xff, ETH_ALEN);

    if (flags & NDIS_80211_ADDKEY_TRANSMIT_KEY)
        priv->encr_tx_key_index = index;

    return 0;
}

static int restore_key(struct usbnet *usbdev, u8 key_idx)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct rndis_wlan_encr_key key;

    if (is_wpa_key(priv, key_idx))
        return 0;

    key = priv->encr_keys[key_idx];

    netdev_dbg(usbdev->net, "%s(): %i:%i\n", __func__, key_idx, key.len);

    if (key.len == 0)
        return 0;

    return add_wep_key(usbdev, key.material, key.len, key_idx);
}

static void restore_keys(struct usbnet *usbdev)
{
    int i;

    for (i = 0; i < 4; i++)
        restore_key(usbdev, i);
}

static void clear_key(struct rndis_wlan_private *priv, u8 idx)
{
    memset(&priv->encr_keys[idx], 0, sizeof(priv->encr_keys[idx]));
}

/* remove_key is for both wep and wpa */
static int remove_key(struct usbnet *usbdev, u8 index, const u8 *bssid)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct ndis_80211_remove_key remove_key;
    __le32 keyindex;
    bool is_wpa;
    int ret;

    if (index >= RNDIS_WLAN_NUM_KEYS)
        return -ENOENT;

    if (priv->encr_keys[index].len == 0)
        return 0;

    is_wpa = is_wpa_key(priv, index);

    netdev_dbg(usbdev->net, "%s(): %i:%s:%i\n",
           __func__, index, is_wpa ? "wpa" : "wep",
           priv->encr_keys[index].len);

    clear_key(priv, index);

    if (is_wpa) {
        remove_key.size = cpu_to_le32(sizeof(remove_key));
        remove_key.index = cpu_to_le32(index);
        if (bssid) {
            /* pairwise key */
            if (!is_broadcast_ether_addr(bssid))
                remove_key.index |=
                    NDIS_80211_ADDKEY_PAIRWISE_KEY;
            memcpy(remove_key.bssid, bssid,
                    sizeof(remove_key.bssid));
        } else
            memset(remove_key.bssid, 0xff,
                        sizeof(remove_key.bssid));

        ret = rndis_set_oid(usbdev,
                RNDIS_OID_802_11_REMOVE_KEY,
                &remove_key, sizeof(remove_key));
        if (ret != 0)
            return ret;
    } else {
        keyindex = cpu_to_le32(index);
        ret = rndis_set_oid(usbdev,
                RNDIS_OID_802_11_REMOVE_WEP,
                &keyindex, sizeof(keyindex));
        if (ret != 0) {
            netdev_warn(usbdev->net,
                    "removing encryption key %d failed (%08X)\n",
                    index, ret);
            return ret;
        }
    }

    /* if it is transmit key, disable encryption */
    if (index == priv->encr_tx_key_index)
        set_encr_mode(usbdev, RNDIS_WLAN_ALG_NONE, RNDIS_WLAN_ALG_NONE);

    return 0;
}

static void set_multicast_list(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct netdev_hw_addr *ha;
    __le32 filter, basefilter;
    int ret;
    char *mc_addrs = NULL;
    int mc_count;

    basefilter = filter = cpu_to_le32(RNDIS_PACKET_TYPE_DIRECTED |
                      RNDIS_PACKET_TYPE_BROADCAST);

    if (usbdev->net->flags & IFF_PROMISC) {
        filter |= cpu_to_le32(RNDIS_PACKET_TYPE_PROMISCUOUS |
                      RNDIS_PACKET_TYPE_ALL_LOCAL);
    } else if (usbdev->net->flags & IFF_ALLMULTI) {
        filter |= cpu_to_le32(RNDIS_PACKET_TYPE_ALL_MULTICAST);
    }

    if (filter != basefilter)
        goto set_filter;

    /*
     * mc_list should be accessed holding the lock, so copy addresses to
     * local buffer first.
     */
    netif_addr_lock_bh(usbdev->net);
    mc_count = netdev_mc_count(usbdev->net);
    if (mc_count > priv->multicast_size) {
        filter |= cpu_to_le32(RNDIS_PACKET_TYPE_ALL_MULTICAST);
    } else if (mc_count) {
        int i = 0;

        mc_addrs = kmalloc(mc_count * ETH_ALEN, GFP_ATOMIC);
        if (!mc_addrs) {
            netdev_warn(usbdev->net,
                    "couldn't alloc %d bytes of memory\n",
                    mc_count * ETH_ALEN);
            netif_addr_unlock_bh(usbdev->net);
            return;
        }

        netdev_for_each_mc_addr(ha, usbdev->net)
            memcpy(mc_addrs + i++ * ETH_ALEN,
                   ha->addr, ETH_ALEN);
    }
    netif_addr_unlock_bh(usbdev->net);

    if (filter != basefilter)
        goto set_filter;

    if (mc_count) {
        ret = rndis_set_oid(usbdev,
                RNDIS_OID_802_3_MULTICAST_LIST,
                mc_addrs, mc_count * ETH_ALEN);
        kfree(mc_addrs);
        if (ret == 0)
            filter |= cpu_to_le32(RNDIS_PACKET_TYPE_MULTICAST);
        else
            filter |= cpu_to_le32(RNDIS_PACKET_TYPE_ALL_MULTICAST);

        netdev_dbg(usbdev->net, "RNDIS_OID_802_3_MULTICAST_LIST(%d, max: %d) -> %d\n",
               mc_count, priv->multicast_size, ret);
    }

set_filter:
    ret = rndis_set_oid(usbdev, RNDIS_OID_GEN_CURRENT_PACKET_FILTER, &filter,
                            sizeof(filter));
    if (ret < 0) {
        netdev_warn(usbdev->net, "couldn't set packet filter: %08x\n",
                le32_to_cpu(filter));
    }

    netdev_dbg(usbdev->net, "RNDIS_OID_GEN_CURRENT_PACKET_FILTER(%08x) -> %d\n",
           le32_to_cpu(filter), ret);
}

#ifdef DEBUG
static void debug_print_pmkids(struct usbnet *usbdev,
                struct ndis_80211_pmkid *pmkids,
                const char *func_str)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    int i, len, count, max_pmkids, entry_len;

    max_pmkids = priv->wdev.wiphy->max_num_pmkids;
    len = le32_to_cpu(pmkids->length);
    count = le32_to_cpu(pmkids->bssid_info_count);

    entry_len = (count > 0) ? (len - sizeof(*pmkids)) / count : -1;

    netdev_dbg(usbdev->net, "%s(): %d PMKIDs (data len: %d, entry len: "
                "%d)\n", func_str, count, len, entry_len);

    if (count > max_pmkids)
        count = max_pmkids;

    for (i = 0; i < count; i++) {
        u32 *tmp = (u32 *)pmkids->bssid_info[i].pmkid;

        netdev_dbg(usbdev->net, "%s():  bssid: %pM, "
                "pmkid: %08X:%08X:%08X:%08X\n",
                func_str, pmkids->bssid_info[i].bssid,
                cpu_to_be32(tmp[0]), cpu_to_be32(tmp[1]),
                cpu_to_be32(tmp[2]), cpu_to_be32(tmp[3]));
    }
}
#else
static void debug_print_pmkids(struct usbnet *usbdev,
                struct ndis_80211_pmkid *pmkids,
                const char *func_str)
{
    return;
}
#endif

static struct ndis_80211_pmkid *get_device_pmkids(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct ndis_80211_pmkid *pmkids;
    int len, ret, max_pmkids;

    max_pmkids = priv->wdev.wiphy->max_num_pmkids;
    len = sizeof(*pmkids) + max_pmkids * sizeof(pmkids->bssid_info[0]);

    pmkids = kzalloc(len, GFP_KERNEL);
    if (!pmkids)
        return ERR_PTR(-ENOMEM);

    pmkids->length = cpu_to_le32(len);
    pmkids->bssid_info_count = cpu_to_le32(max_pmkids);

    ret = rndis_query_oid(usbdev, RNDIS_OID_802_11_PMKID,
            pmkids, &len);
    if (ret < 0) {
        netdev_dbg(usbdev->net, "%s(): RNDIS_OID_802_11_PMKID(%d, %d)"
                " -> %d\n", __func__, len, max_pmkids, ret);

        kfree(pmkids);
        return ERR_PTR(ret);
    }

    if (le32_to_cpu(pmkids->bssid_info_count) > max_pmkids)
        pmkids->bssid_info_count = cpu_to_le32(max_pmkids);

    debug_print_pmkids(usbdev, pmkids, __func__);

    return pmkids;
}

static int set_device_pmkids(struct usbnet *usbdev,
                struct ndis_80211_pmkid *pmkids)
{
    int ret, len, num_pmkids;

    num_pmkids = le32_to_cpu(pmkids->bssid_info_count);
    len = sizeof(*pmkids) + num_pmkids * sizeof(pmkids->bssid_info[0]);
    pmkids->length = cpu_to_le32(len);

    debug_print_pmkids(usbdev, pmkids, __func__);

    ret = rndis_set_oid(usbdev, RNDIS_OID_802_11_PMKID, pmkids,
                le32_to_cpu(pmkids->length));
    if (ret < 0) {
        netdev_dbg(usbdev->net, "%s(): RNDIS_OID_802_11_PMKID(%d, %d) -> %d"
                "\n", __func__, len, num_pmkids, ret);
    }

    kfree(pmkids);
    return ret;
}

static struct ndis_80211_pmkid *remove_pmkid(struct usbnet *usbdev,
                        struct ndis_80211_pmkid *pmkids,
                        struct cfg80211_pmksa *pmksa,
                        int max_pmkids)
{
    int i, newlen, err;
    unsigned int count;

    count = le32_to_cpu(pmkids->bssid_info_count);

    if (count > max_pmkids)
        count = max_pmkids;

    for (i = 0; i < count; i++)
        if (ether_addr_equal(pmkids->bssid_info[i].bssid,
                     pmksa->bssid))
            break;

    /* pmkid not found */
    if (i == count) {
        netdev_dbg(usbdev->net, "%s(): bssid not found (%pM)\n",
                    __func__, pmksa->bssid);
        err = -ENOENT;
        goto error;
    }

    for (; i + 1 < count; i++)
        pmkids->bssid_info[i] = pmkids->bssid_info[i + 1];

    count--;
    newlen = sizeof(*pmkids) + count * sizeof(pmkids->bssid_info[0]);

    pmkids->length = cpu_to_le32(newlen);
    pmkids->bssid_info_count = cpu_to_le32(count);

    return pmkids;
error:
    kfree(pmkids);
    return ERR_PTR(err);
}

static struct ndis_80211_pmkid *update_pmkid(struct usbnet *usbdev,
                        struct ndis_80211_pmkid *pmkids,
                        struct cfg80211_pmksa *pmksa,
                        int max_pmkids)
{
    struct ndis_80211_pmkid *new_pmkids;
    int i, err, newlen;
    unsigned int count;

    count = le32_to_cpu(pmkids->bssid_info_count);

    if (count > max_pmkids)
        count = max_pmkids;

    /* update with new pmkid */
    for (i = 0; i < count; i++) {
        if (!ether_addr_equal(pmkids->bssid_info[i].bssid,
                      pmksa->bssid))
            continue;

        memcpy(pmkids->bssid_info[i].pmkid, pmksa->pmkid,
                                WLAN_PMKID_LEN);

        return pmkids;
    }

    /* out of space, return error */
    if (i == max_pmkids) {
        netdev_dbg(usbdev->net, "%s(): out of space\n", __func__);
        err = -ENOSPC;
        goto error;
    }

    /* add new pmkid */
    newlen = sizeof(*pmkids) + (count + 1) * sizeof(pmkids->bssid_info[0]);

    new_pmkids = krealloc(pmkids, newlen, GFP_KERNEL);
    if (!new_pmkids) {
        err = -ENOMEM;
        goto error;
    }
    pmkids = new_pmkids;

    pmkids->length = cpu_to_le32(newlen);
    pmkids->bssid_info_count = cpu_to_le32(count + 1);

    memcpy(pmkids->bssid_info[count].bssid, pmksa->bssid, ETH_ALEN);
    memcpy(pmkids->bssid_info[count].pmkid, pmksa->pmkid, WLAN_PMKID_LEN);

    return pmkids;
error:
    kfree(pmkids);
    return ERR_PTR(err);
}

/*
 * cfg80211 ops
 */
static int rndis_change_virtual_intf(struct wiphy *wiphy,
                    struct net_device *dev,
                    enum nl80211_iftype type, u32 *flags,
                    struct vif_params *params)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    int mode;

    switch (type) {
    case NL80211_IFTYPE_ADHOC:
        mode = NDIS_80211_INFRA_ADHOC;
        break;
    case NL80211_IFTYPE_STATION:
        mode = NDIS_80211_INFRA_INFRA;
        break;
    default:
        return -EINVAL;
    }

    priv->wdev.iftype = type;

    return set_infra_mode(usbdev, mode);
}

static int rndis_set_wiphy_params(struct wiphy *wiphy, u32 changed)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    int err;

    if (changed & WIPHY_PARAM_FRAG_THRESHOLD) {
        err = set_frag_threshold(usbdev, wiphy->frag_threshold);
        if (err < 0)
            return err;
    }

    if (changed & WIPHY_PARAM_RTS_THRESHOLD) {
        err = set_rts_threshold(usbdev, wiphy->rts_threshold);
        if (err < 0)
            return err;
    }

    return 0;
}

static int rndis_set_tx_power(struct wiphy *wiphy,
                  enum nl80211_tx_power_setting type,
                  int mbm)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;

    netdev_dbg(usbdev->net, "%s(): type:0x%x mbm:%i\n",
           __func__, type, mbm);

    if (mbm < 0 || (mbm % 100))
        return -ENOTSUPP;

    /* Device doesn't support changing txpower after initialization, only
     * turn off/on radio. Support 'auto' mode and setting same dBm that is
     * currently used.
     */
    if (type == NL80211_TX_POWER_AUTOMATIC ||
        MBM_TO_DBM(mbm) == get_bcm4320_power_dbm(priv)) {
        if (!priv->radio_on)
            disassociate(usbdev, true); /* turn on radio */

        return 0;
    }

    return -ENOTSUPP;
}

static int rndis_get_tx_power(struct wiphy *wiphy, int *dbm)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;

    *dbm = get_bcm4320_power_dbm(priv);

    netdev_dbg(usbdev->net, "%s(): dbm:%i\n", __func__, *dbm);

    return 0;
}

#define SCAN_DELAY_JIFFIES (6 * HZ)
static int rndis_scan(struct wiphy *wiphy,
            struct cfg80211_scan_request *request)
{
    struct net_device *dev = request->wdev->netdev;
    struct usbnet *usbdev = netdev_priv(dev);
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    int ret;
    int delay = SCAN_DELAY_JIFFIES;

    netdev_dbg(usbdev->net, "cfg80211.scan\n");

    /* Get current bssid list from device before new scan, as new scan
     * clears internal bssid list.
     */
    rndis_check_bssid_list(usbdev, NULL, NULL);

    if (priv->scan_request && priv->scan_request != request)
        return -EBUSY;

    priv->scan_request = request;

    ret = rndis_start_bssid_list_scan(usbdev);
    if (ret == 0) {
        if (priv->device_type == RNDIS_BCM4320A)
            delay = HZ;

        /* Wait before retrieving scan results from device */
        queue_delayed_work(priv->workqueue, &priv->scan_work, delay);
    }

    return ret;
}

static bool rndis_bss_info_update(struct usbnet *usbdev,
                  struct ndis_80211_bssid_ex *bssid)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct ieee80211_channel *channel;
    struct cfg80211_bss *bss;
    s32 signal;
    u64 timestamp;
    u16 capability;
    u16 beacon_interval;
    struct ndis_80211_fixed_ies *fixed;
    int ie_len, bssid_len;
    u8 *ie;

    netdev_dbg(usbdev->net, " found bssid: '%.32s' [%pM], len: %d\n",
           bssid->ssid.essid, bssid->mac, le32_to_cpu(bssid->length));

    /* parse bssid structure */
    bssid_len = le32_to_cpu(bssid->length);

    if (bssid_len < sizeof(struct ndis_80211_bssid_ex) +
            sizeof(struct ndis_80211_fixed_ies))
        return NULL;

    fixed = (struct ndis_80211_fixed_ies *)bssid->ies;

    ie = (void *)(bssid->ies + sizeof(struct ndis_80211_fixed_ies));
    ie_len = min(bssid_len - (int)sizeof(*bssid),
                    (int)le32_to_cpu(bssid->ie_length));
    ie_len -= sizeof(struct ndis_80211_fixed_ies);
    if (ie_len < 0)
        return NULL;

    /* extract data for cfg80211_inform_bss */
    channel = ieee80211_get_channel(priv->wdev.wiphy,
            KHZ_TO_MHZ(le32_to_cpu(bssid->config.ds_config)));
    if (!channel)
        return NULL;

    signal = level_to_qual(le32_to_cpu(bssid->rssi));
    timestamp = le64_to_cpu(*(__le64 *)fixed->timestamp);
    capability = le16_to_cpu(fixed->capabilities);
    beacon_interval = le16_to_cpu(fixed->beacon_interval);

    bss = cfg80211_inform_bss(priv->wdev.wiphy, channel, bssid->mac,
        timestamp, capability, beacon_interval, ie, ie_len, signal,
        GFP_KERNEL);
    cfg80211_put_bss(bss);

    return (bss != NULL);
}

static struct ndis_80211_bssid_ex *next_bssid_list_item(
                    struct ndis_80211_bssid_ex *bssid,
                    int *bssid_len, void *buf, int len)
{
    void *buf_end, *bssid_end;

    buf_end = (char *)buf + len;
    bssid_end = (char *)bssid + *bssid_len;

    if ((int)(buf_end - bssid_end) < sizeof(bssid->length)) {
        *bssid_len = 0;
        return NULL;
    } else {
        bssid = (void *)((char *)bssid + *bssid_len);
        *bssid_len = le32_to_cpu(bssid->length);
        return bssid;
    }
}

static bool check_bssid_list_item(struct ndis_80211_bssid_ex *bssid,
                  int bssid_len, void *buf, int len)
{
    void *buf_end, *bssid_end;

    if (!bssid || bssid_len <= 0 || bssid_len > len)
        return false;

    buf_end = (char *)buf + len;
    bssid_end = (char *)bssid + bssid_len;

    return (int)(buf_end - bssid_end) >= 0 && (int)(bssid_end - buf) >= 0;
}

static int rndis_check_bssid_list(struct usbnet *usbdev, u8 *match_bssid,
                    bool *matched)
{
    void *buf = NULL;
    struct ndis_80211_bssid_list_ex *bssid_list;
    struct ndis_80211_bssid_ex *bssid;
    int ret = -EINVAL, len, count, bssid_len, real_count, new_len;

    netdev_dbg(usbdev->net, "%s()\n", __func__);

    len = CONTROL_BUFFER_SIZE;
resize_buf:
    buf = kzalloc(len, GFP_KERNEL);
    if (!buf) {
        ret = -ENOMEM;
        goto out;
    }

    /* BSSID-list might have got bigger last time we checked, keep
     * resizing until it won't get any bigger.
     */
    new_len = len;
    ret = rndis_query_oid(usbdev, RNDIS_OID_802_11_BSSID_LIST,
                  buf, &new_len);
    if (ret != 0 || new_len < sizeof(struct ndis_80211_bssid_list_ex))
        goto out;

    if (new_len > len) {
        len = new_len;
        kfree(buf);
        goto resize_buf;
    }

    len = new_len;

    bssid_list = buf;
    count = le32_to_cpu(bssid_list->num_items);
    real_count = 0;
    netdev_dbg(usbdev->net, "%s(): buflen: %d\n", __func__, len);

    bssid_len = 0;
    bssid = next_bssid_list_item(bssid_list->bssid, &bssid_len, buf, len);

    /* Device returns incorrect 'num_items'. Workaround by ignoring the
     * received 'num_items' and walking through full bssid buffer instead.
     */
    while (check_bssid_list_item(bssid, bssid_len, buf, len)) {
        if (rndis_bss_info_update(usbdev, bssid) && match_bssid &&
            matched) {
            if (ether_addr_equal(bssid->mac, match_bssid))
                *matched = true;
        }

        real_count++;
        bssid = next_bssid_list_item(bssid, &bssid_len, buf, len);
    }

    netdev_dbg(usbdev->net, "%s(): num_items from device: %d, really found:"
                " %d\n", __func__, count, real_count);

out:
    kfree(buf);
    return ret;
}

static void rndis_get_scan_results(struct work_struct *work)
{
    struct rndis_wlan_private *priv =
        container_of(work, struct rndis_wlan_private, scan_work.work);
    struct usbnet *usbdev = priv->usbdev;
    int ret;

    netdev_dbg(usbdev->net, "get_scan_results\n");

    if (!priv->scan_request)
        return;

    ret = rndis_check_bssid_list(usbdev, NULL, NULL);

    cfg80211_scan_done(priv->scan_request, ret < 0);

    priv->scan_request = NULL;
}

static int rndis_connect(struct wiphy *wiphy, struct net_device *dev,
                    struct cfg80211_connect_params *sme)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    struct ieee80211_channel *channel = sme->channel;
    struct ndis_80211_ssid ssid;
    int pairwise = RNDIS_WLAN_ALG_NONE;
    int groupwise = RNDIS_WLAN_ALG_NONE;
    int keymgmt = RNDIS_WLAN_KEY_MGMT_NONE;
    int length, i, ret, chan = -1;

    if (channel)
        chan = ieee80211_frequency_to_channel(channel->center_freq);

    groupwise = rndis_cipher_to_alg(sme->crypto.cipher_group);
    for (i = 0; i < sme->crypto.n_ciphers_pairwise; i++)
        pairwise |=
            rndis_cipher_to_alg(sme->crypto.ciphers_pairwise[i]);

    if (sme->crypto.n_ciphers_pairwise > 0 &&
            pairwise == RNDIS_WLAN_ALG_NONE) {
        netdev_err(usbdev->net, "Unsupported pairwise cipher\n");
        return -ENOTSUPP;
    }

    for (i = 0; i < sme->crypto.n_akm_suites; i++)
        keymgmt |=
            rndis_akm_suite_to_key_mgmt(sme->crypto.akm_suites[i]);

    if (sme->crypto.n_akm_suites > 0 &&
            keymgmt == RNDIS_WLAN_KEY_MGMT_NONE) {
        netdev_err(usbdev->net, "Invalid keymgmt\n");
        return -ENOTSUPP;
    }

    netdev_dbg(usbdev->net, "cfg80211.connect('%.32s':[%pM]:%d:[%d,0x%x:0x%x]:[0x%x:0x%x]:0x%x)\n",
           sme->ssid, sme->bssid, chan,
           sme->privacy, sme->crypto.wpa_versions, sme->auth_type,
           groupwise, pairwise, keymgmt);

    if (is_associated(usbdev))
        disassociate(usbdev, false);

    ret = set_infra_mode(usbdev, NDIS_80211_INFRA_INFRA);
    if (ret < 0) {
        netdev_dbg(usbdev->net, "connect: set_infra_mode failed, %d\n",
               ret);
        goto err_turn_radio_on;
    }

    ret = set_auth_mode(usbdev, sme->crypto.wpa_versions, sme->auth_type,
                                keymgmt);
    if (ret < 0) {
        netdev_dbg(usbdev->net, "connect: set_auth_mode failed, %d\n",
               ret);
        goto err_turn_radio_on;
    }

    set_priv_filter(usbdev);

    ret = set_encr_mode(usbdev, pairwise, groupwise);
    if (ret < 0) {
        netdev_dbg(usbdev->net, "connect: set_encr_mode failed, %d\n",
               ret);
        goto err_turn_radio_on;
    }

    if (channel) {
        ret = set_channel(usbdev, chan);
        if (ret < 0) {
            netdev_dbg(usbdev->net, "connect: set_channel failed, %d\n",
                   ret);
            goto err_turn_radio_on;
        }
    }

    if (sme->key && ((groupwise | pairwise) & RNDIS_WLAN_ALG_WEP)) {
        priv->encr_tx_key_index = sme->key_idx;
        ret = add_wep_key(usbdev, sme->key, sme->key_len, sme->key_idx);
        if (ret < 0) {
            netdev_dbg(usbdev->net, "connect: add_wep_key failed, %d (%d, %d)\n",
                   ret, sme->key_len, sme->key_idx);
            goto err_turn_radio_on;
        }
    }

    if (sme->bssid && !is_zero_ether_addr(sme->bssid) &&
                !is_broadcast_ether_addr(sme->bssid)) {
        ret = set_bssid(usbdev, sme->bssid);
        if (ret < 0) {
            netdev_dbg(usbdev->net, "connect: set_bssid failed, %d\n",
                   ret);
            goto err_turn_radio_on;
        }
    } else
        clear_bssid(usbdev);

    length = sme->ssid_len;
    if (length > NDIS_802_11_LENGTH_SSID)
        length = NDIS_802_11_LENGTH_SSID;

    memset(&ssid, 0, sizeof(ssid));
    ssid.length = cpu_to_le32(length);
    memcpy(ssid.essid, sme->ssid, length);

    /* Pause and purge rx queue, so we don't pass packets before
     * 'media connect'-indication.
     */
    usbnet_pause_rx(usbdev);
    usbnet_purge_paused_rxq(usbdev);

    ret = set_essid(usbdev, &ssid);
    if (ret < 0)
        netdev_dbg(usbdev->net, "connect: set_essid failed, %d\n", ret);
    return ret;

err_turn_radio_on:
    disassociate(usbdev, true);

    return ret;
}

static int rndis_disconnect(struct wiphy *wiphy, struct net_device *dev,
                                u16 reason_code)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;

    netdev_dbg(usbdev->net, "cfg80211.disconnect(%d)\n", reason_code);

    priv->connected = false;
    memset(priv->bssid, 0, ETH_ALEN);

    return deauthenticate(usbdev);
}

static int rndis_join_ibss(struct wiphy *wiphy, struct net_device *dev,
                    struct cfg80211_ibss_params *params)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    struct ieee80211_channel *channel = params->channel;
    struct ndis_80211_ssid ssid;
    enum nl80211_auth_type auth_type;
    int ret, alg, length, chan = -1;

    if (channel)
        chan = ieee80211_frequency_to_channel(channel->center_freq);

    /* TODO: How to handle ad-hoc encryption?
     * connect() has *key, join_ibss() doesn't. RNDIS requires key to be
     * pre-shared for encryption (open/shared/wpa), is key set before
     * join_ibss? Which auth_type to use (not in params)? What about WPA?
     */
    if (params->privacy) {
        auth_type = NL80211_AUTHTYPE_SHARED_KEY;
        alg = RNDIS_WLAN_ALG_WEP;
    } else {
        auth_type = NL80211_AUTHTYPE_OPEN_SYSTEM;
        alg = RNDIS_WLAN_ALG_NONE;
    }

    netdev_dbg(usbdev->net, "cfg80211.join_ibss('%.32s':[%pM]:%d:%d)\n",
           params->ssid, params->bssid, chan, params->privacy);

    if (is_associated(usbdev))
        disassociate(usbdev, false);

    ret = set_infra_mode(usbdev, NDIS_80211_INFRA_ADHOC);
    if (ret < 0) {
        netdev_dbg(usbdev->net, "join_ibss: set_infra_mode failed, %d\n",
               ret);
        goto err_turn_radio_on;
    }

    ret = set_auth_mode(usbdev, 0, auth_type, RNDIS_WLAN_KEY_MGMT_NONE);
    if (ret < 0) {
        netdev_dbg(usbdev->net, "join_ibss: set_auth_mode failed, %d\n",
               ret);
        goto err_turn_radio_on;
    }

    set_priv_filter(usbdev);

    ret = set_encr_mode(usbdev, alg, RNDIS_WLAN_ALG_NONE);
    if (ret < 0) {
        netdev_dbg(usbdev->net, "join_ibss: set_encr_mode failed, %d\n",
               ret);
        goto err_turn_radio_on;
    }

    if (channel) {
        ret = set_channel(usbdev, chan);
        if (ret < 0) {
            netdev_dbg(usbdev->net, "join_ibss: set_channel failed, %d\n",
                   ret);
            goto err_turn_radio_on;
        }
    }

    if (params->bssid && !is_zero_ether_addr(params->bssid) &&
                !is_broadcast_ether_addr(params->bssid)) {
        ret = set_bssid(usbdev, params->bssid);
        if (ret < 0) {
            netdev_dbg(usbdev->net, "join_ibss: set_bssid failed, %d\n",
                   ret);
            goto err_turn_radio_on;
        }
    } else
        clear_bssid(usbdev);

    length = params->ssid_len;
    if (length > NDIS_802_11_LENGTH_SSID)
        length = NDIS_802_11_LENGTH_SSID;

    memset(&ssid, 0, sizeof(ssid));
    ssid.length = cpu_to_le32(length);
    memcpy(ssid.essid, params->ssid, length);

    /* Don't need to pause rx queue for ad-hoc. */
    usbnet_purge_paused_rxq(usbdev);
    usbnet_resume_rx(usbdev);

    ret = set_essid(usbdev, &ssid);
    if (ret < 0)
        netdev_dbg(usbdev->net, "join_ibss: set_essid failed, %d\n",
               ret);
    return ret;

err_turn_radio_on:
    disassociate(usbdev, true);

    return ret;
}

static int rndis_leave_ibss(struct wiphy *wiphy, struct net_device *dev)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;

    netdev_dbg(usbdev->net, "cfg80211.leave_ibss()\n");

    priv->connected = false;
    memset(priv->bssid, 0, ETH_ALEN);

    return deauthenticate(usbdev);
}

static int rndis_add_key(struct wiphy *wiphy, struct net_device *netdev,
             u8 key_index, bool pairwise, const u8 *mac_addr,
             struct key_params *params)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    __le32 flags;

    netdev_dbg(usbdev->net, "%s(%i, %pM, %08x)\n",
           __func__, key_index, mac_addr, params->cipher);

    switch (params->cipher) {
    case WLAN_CIPHER_SUITE_WEP40:
    case WLAN_CIPHER_SUITE_WEP104:
        return add_wep_key(usbdev, params->key, params->key_len,
                                key_index);
    case WLAN_CIPHER_SUITE_TKIP:
    case WLAN_CIPHER_SUITE_CCMP:
        flags = 0;

        if (params->seq && params->seq_len > 0)
            flags |= NDIS_80211_ADDKEY_SET_INIT_RECV_SEQ;
        if (mac_addr)
            flags |= NDIS_80211_ADDKEY_PAIRWISE_KEY |
                    NDIS_80211_ADDKEY_TRANSMIT_KEY;

        return add_wpa_key(usbdev, params->key, params->key_len,
                key_index, mac_addr, params->seq,
                params->seq_len, params->cipher, flags);
    default:
        netdev_dbg(usbdev->net, "%s(): unsupported cipher %08x\n",
               __func__, params->cipher);
        return -ENOTSUPP;
    }
}

static int rndis_del_key(struct wiphy *wiphy, struct net_device *netdev,
             u8 key_index, bool pairwise, const u8 *mac_addr)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;

    netdev_dbg(usbdev->net, "%s(%i, %pM)\n", __func__, key_index, mac_addr);

    return remove_key(usbdev, key_index, mac_addr);
}

static int rndis_set_default_key(struct wiphy *wiphy, struct net_device *netdev,
                 u8 key_index, bool unicast, bool multicast)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    struct rndis_wlan_encr_key key;

    netdev_dbg(usbdev->net, "%s(%i)\n", __func__, key_index);

    if (key_index >= RNDIS_WLAN_NUM_KEYS)
        return -ENOENT;

    priv->encr_tx_key_index = key_index;

    if (is_wpa_key(priv, key_index))
        return 0;

    key = priv->encr_keys[key_index];

    return add_wep_key(usbdev, key.material, key.len, key_index);
}

static void rndis_fill_station_info(struct usbnet *usbdev,
                        struct station_info *sinfo)
{
    __le32 linkspeed, rssi;
    int ret, len;

    memset(sinfo, 0, sizeof(*sinfo));

    len = sizeof(linkspeed);
    ret = rndis_query_oid(usbdev, RNDIS_OID_GEN_LINK_SPEED, &linkspeed, &len);
    if (ret == 0) {
        sinfo->txrate.legacy = le32_to_cpu(linkspeed) / 1000;
        sinfo->filled |= STATION_INFO_TX_BITRATE;
    }

    len = sizeof(rssi);
    ret = rndis_query_oid(usbdev, RNDIS_OID_802_11_RSSI,
                  &rssi, &len);
    if (ret == 0) {
        sinfo->signal = level_to_qual(le32_to_cpu(rssi));
        sinfo->filled |= STATION_INFO_SIGNAL;
    }
}

static int rndis_get_station(struct wiphy *wiphy, struct net_device *dev,
                    u8 *mac, struct station_info *sinfo)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;

    if (!ether_addr_equal(priv->bssid, mac))
        return -ENOENT;

    rndis_fill_station_info(usbdev, sinfo);

    return 0;
}

static int rndis_dump_station(struct wiphy *wiphy, struct net_device *dev,
                   int idx, u8 *mac, struct station_info *sinfo)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;

    if (idx != 0)
        return -ENOENT;

    memcpy(mac, priv->bssid, ETH_ALEN);

    rndis_fill_station_info(usbdev, sinfo);

    return 0;
}

static int rndis_set_pmksa(struct wiphy *wiphy, struct net_device *netdev,
                struct cfg80211_pmksa *pmksa)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    struct ndis_80211_pmkid *pmkids;
    u32 *tmp = (u32 *)pmksa->pmkid;

    netdev_dbg(usbdev->net, "%s(%pM, %08X:%08X:%08X:%08X)\n", __func__,
            pmksa->bssid,
            cpu_to_be32(tmp[0]), cpu_to_be32(tmp[1]),
            cpu_to_be32(tmp[2]), cpu_to_be32(tmp[3]));

    pmkids = get_device_pmkids(usbdev);
    if (IS_ERR(pmkids)) {
        /* couldn't read PMKID cache from device */
        return PTR_ERR(pmkids);
    }

    pmkids = update_pmkid(usbdev, pmkids, pmksa, wiphy->max_num_pmkids);
    if (IS_ERR(pmkids)) {
        /* not found, list full, etc */
        return PTR_ERR(pmkids);
    }

    return set_device_pmkids(usbdev, pmkids);
}

static int rndis_del_pmksa(struct wiphy *wiphy, struct net_device *netdev,
                struct cfg80211_pmksa *pmksa)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    struct ndis_80211_pmkid *pmkids;
    u32 *tmp = (u32 *)pmksa->pmkid;

    netdev_dbg(usbdev->net, "%s(%pM, %08X:%08X:%08X:%08X)\n", __func__,
            pmksa->bssid,
            cpu_to_be32(tmp[0]), cpu_to_be32(tmp[1]),
            cpu_to_be32(tmp[2]), cpu_to_be32(tmp[3]));

    pmkids = get_device_pmkids(usbdev);
    if (IS_ERR(pmkids)) {
        /* Couldn't read PMKID cache from device */
        return PTR_ERR(pmkids);
    }

    pmkids = remove_pmkid(usbdev, pmkids, pmksa, wiphy->max_num_pmkids);
    if (IS_ERR(pmkids)) {
        /* not found, etc */
        return PTR_ERR(pmkids);
    }

    return set_device_pmkids(usbdev, pmkids);
}

static int rndis_flush_pmksa(struct wiphy *wiphy, struct net_device *netdev)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    struct ndis_80211_pmkid pmkid;

    netdev_dbg(usbdev->net, "%s()\n", __func__);

    memset(&pmkid, 0, sizeof(pmkid));

    pmkid.length = cpu_to_le32(sizeof(pmkid));
    pmkid.bssid_info_count = cpu_to_le32(0);

    return rndis_set_oid(usbdev, RNDIS_OID_802_11_PMKID,
                 &pmkid, sizeof(pmkid));
}

static int rndis_set_power_mgmt(struct wiphy *wiphy, struct net_device *dev,
                bool enabled, int timeout)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);
    struct usbnet *usbdev = priv->usbdev;
    int power_mode;
    __le32 mode;
    int ret;

    if (priv->device_type != RNDIS_BCM4320B)
        return -ENOTSUPP;

    netdev_dbg(usbdev->net, "%s(): %s, %d\n", __func__,
                enabled ? "enabled" : "disabled",
                timeout);

    if (enabled)
        power_mode = NDIS_80211_POWER_MODE_FAST_PSP;
    else
        power_mode = NDIS_80211_POWER_MODE_CAM;

    if (power_mode == priv->power_mode)
        return 0;

    priv->power_mode = power_mode;

    mode = cpu_to_le32(power_mode);
    ret = rndis_set_oid(usbdev, RNDIS_OID_802_11_POWER_MODE,
                &mode, sizeof(mode));

    netdev_dbg(usbdev->net, "%s(): RNDIS_OID_802_11_POWER_MODE -> %d\n",
                __func__, ret);

    return ret;
}

static int rndis_set_cqm_rssi_config(struct wiphy *wiphy,
                    struct net_device *dev,
                    s32 rssi_thold, u32 rssi_hyst)
{
    struct rndis_wlan_private *priv = wiphy_priv(wiphy);

    priv->cqm_rssi_thold = rssi_thold;
    priv->cqm_rssi_hyst = rssi_hyst;
    priv->last_cqm_event_rssi = 0;

    return 0;
}

static void rndis_wlan_craft_connected_bss(struct usbnet *usbdev, u8 *bssid,
                       struct ndis_80211_assoc_info *info)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct ieee80211_channel *channel;
    struct ndis_80211_ssid ssid;
    struct cfg80211_bss *bss;
    s32 signal;
    u64 timestamp;
    u16 capability;
    u32 beacon_period = 0;
    __le32 rssi;
    u8 ie_buf[34];
    int len, ret, ie_len;

    /* Get signal quality, in case of error use rssi=0 and ignore error. */
    len = sizeof(rssi);
    rssi = 0;
    ret = rndis_query_oid(usbdev, RNDIS_OID_802_11_RSSI,
                  &rssi, &len);
    signal = level_to_qual(le32_to_cpu(rssi));

    netdev_dbg(usbdev->net, "%s(): RNDIS_OID_802_11_RSSI -> %d, "
           "rssi:%d, qual: %d\n", __func__, ret, le32_to_cpu(rssi),
           level_to_qual(le32_to_cpu(rssi)));

    /* Get AP capabilities */
    if (info) {
        capability = le16_to_cpu(info->resp_ie.capa);
    } else {
        /* Set atleast ESS/IBSS capability */
        capability = (priv->infra_mode == NDIS_80211_INFRA_INFRA) ?
                WLAN_CAPABILITY_ESS : WLAN_CAPABILITY_IBSS;
    }

    /* Get channel and beacon interval */
    channel = get_current_channel(usbdev, &beacon_period);
    if (!channel) {
        netdev_warn(usbdev->net, "%s(): could not get channel.\n",
                    __func__);
        return;
    }

    /* Get SSID, in case of error, use zero length SSID and ignore error. */
    len = sizeof(ssid);
    memset(&ssid, 0, sizeof(ssid));
    ret = rndis_query_oid(usbdev, RNDIS_OID_802_11_SSID,
                  &ssid, &len);
    netdev_dbg(usbdev->net, "%s(): RNDIS_OID_802_11_SSID -> %d, len: %d, ssid: "
                "'%.32s'\n", __func__, ret,
                le32_to_cpu(ssid.length), ssid.essid);

    if (le32_to_cpu(ssid.length) > 32)
        ssid.length = cpu_to_le32(32);

    ie_buf[0] = WLAN_EID_SSID;
    ie_buf[1] = le32_to_cpu(ssid.length);
    memcpy(&ie_buf[2], ssid.essid, le32_to_cpu(ssid.length));

    ie_len = le32_to_cpu(ssid.length) + 2;

    /* no tsf */
    timestamp = 0;

    netdev_dbg(usbdev->net, "%s(): channel:%d(freq), bssid:[%pM], tsf:%d, "
        "capa:%x, beacon int:%d, resp_ie(len:%d, essid:'%.32s'), "
        "signal:%d\n", __func__, (channel ? channel->center_freq : -1),
        bssid, (u32)timestamp, capability, beacon_period, ie_len,
        ssid.essid, signal);

    bss = cfg80211_inform_bss(priv->wdev.wiphy, channel, bssid,
        timestamp, capability, beacon_period, ie_buf, ie_len,
        signal, GFP_KERNEL);
    cfg80211_put_bss(bss);
}

/*
 * workers, indication handlers, device poller
 */
static void rndis_wlan_do_link_up_work(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct ndis_80211_assoc_info *info = NULL;
    u8 bssid[ETH_ALEN];
    unsigned int resp_ie_len, req_ie_len;
    unsigned int offset;
    u8 *req_ie, *resp_ie;
    int ret;
    bool roamed = false;
    bool match_bss;

    if (priv->infra_mode == NDIS_80211_INFRA_INFRA && priv->connected) {
        /* received media connect indication while connected, either
         * device reassociated with same AP or roamed to new. */
        roamed = true;
    }

    req_ie_len = 0;
    resp_ie_len = 0;
    req_ie = NULL;
    resp_ie = NULL;

    if (priv->infra_mode == NDIS_80211_INFRA_INFRA) {
        info = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
        if (!info) {
            /* No memory? Try resume work later */
            set_bit(WORK_LINK_UP, &priv->work_pending);
            queue_work(priv->workqueue, &priv->work);
            return;
        }

        /* Get association info IEs from device. */
        ret = get_association_info(usbdev, info, CONTROL_BUFFER_SIZE);
        if (!ret) {
            req_ie_len = le32_to_cpu(info->req_ie_length);
            if (req_ie_len > CONTROL_BUFFER_SIZE)
                req_ie_len = CONTROL_BUFFER_SIZE;
            if (req_ie_len != 0) {
                offset = le32_to_cpu(info->offset_req_ies);

                if (offset > CONTROL_BUFFER_SIZE)
                    offset = CONTROL_BUFFER_SIZE;

                req_ie = (u8 *)info + offset;

                if (offset + req_ie_len > CONTROL_BUFFER_SIZE)
                    req_ie_len =
                        CONTROL_BUFFER_SIZE - offset;
            }

            resp_ie_len = le32_to_cpu(info->resp_ie_length);
            if (resp_ie_len > CONTROL_BUFFER_SIZE)
                resp_ie_len = CONTROL_BUFFER_SIZE;
            if (resp_ie_len != 0) {
                offset = le32_to_cpu(info->offset_resp_ies);

                if (offset > CONTROL_BUFFER_SIZE)
                    offset = CONTROL_BUFFER_SIZE;

                resp_ie = (u8 *)info + offset;

                if (offset + resp_ie_len > CONTROL_BUFFER_SIZE)
                    resp_ie_len =
                        CONTROL_BUFFER_SIZE - offset;
            }
        } else {
            /* Since rndis_wlan_craft_connected_bss() might use info
             * later and expects info to contain valid data if
             * non-null, free info and set NULL here.
             */
            kfree(info);
            info = NULL;
        }
    } else if (WARN_ON(priv->infra_mode != NDIS_80211_INFRA_ADHOC))
        return;

    ret = get_bssid(usbdev, bssid);
    if (ret < 0)
        memset(bssid, 0, sizeof(bssid));

    netdev_dbg(usbdev->net, "link up work: [%pM]%s\n",
           bssid, roamed ? " roamed" : "");

    /* Internal bss list in device should contain at least the currently
     * connected bss and we can get it to cfg80211 with
     * rndis_check_bssid_list().
     *
     * NDIS spec says: "If the device is associated, but the associated
     *  BSSID is not in its BSSID scan list, then the driver must add an
     *  entry for the BSSID at the end of the data that it returns in
     *  response to query of RNDIS_OID_802_11_BSSID_LIST."
     *
     * NOTE: Seems to be true for BCM4320b variant, but not BCM4320a.
     */
    match_bss = false;
    rndis_check_bssid_list(usbdev, bssid, &match_bss);

    if (!is_zero_ether_addr(bssid) && !match_bss) {
        /* Couldn't get bss from device, we need to manually craft bss
         * for cfg80211.
         */
        rndis_wlan_craft_connected_bss(usbdev, bssid, info);
    }

    if (priv->infra_mode == NDIS_80211_INFRA_INFRA) {
        if (!roamed)
            cfg80211_connect_result(usbdev->net, bssid, req_ie,
                        req_ie_len, resp_ie,
                        resp_ie_len, 0, GFP_KERNEL);
        else
            cfg80211_roamed(usbdev->net,
                    get_current_channel(usbdev, NULL),
                    bssid, req_ie, req_ie_len,
                    resp_ie, resp_ie_len, GFP_KERNEL);
    } else if (priv->infra_mode == NDIS_80211_INFRA_ADHOC)
        cfg80211_ibss_joined(usbdev->net, bssid, GFP_KERNEL);

    if (info != NULL)
        kfree(info);

    priv->connected = true;
    memcpy(priv->bssid, bssid, ETH_ALEN);

    usbnet_resume_rx(usbdev);
    netif_carrier_on(usbdev->net);
}

static void rndis_wlan_do_link_down_work(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);

    if (priv->connected) {
        priv->connected = false;
        memset(priv->bssid, 0, ETH_ALEN);

        deauthenticate(usbdev);

        cfg80211_disconnected(usbdev->net, 0, NULL, 0, GFP_KERNEL);
    }

    netif_carrier_off(usbdev->net);
}

static void rndis_wlan_worker(struct work_struct *work)
{
    struct rndis_wlan_private *priv =
        container_of(work, struct rndis_wlan_private, work);
    struct usbnet *usbdev = priv->usbdev;

    if (test_and_clear_bit(WORK_LINK_UP, &priv->work_pending))
        rndis_wlan_do_link_up_work(usbdev);

    if (test_and_clear_bit(WORK_LINK_DOWN, &priv->work_pending))
        rndis_wlan_do_link_down_work(usbdev);

    if (test_and_clear_bit(WORK_SET_MULTICAST_LIST, &priv->work_pending))
        set_multicast_list(usbdev);
}

static void rndis_wlan_set_multicast_list(struct net_device *dev)
{
    struct usbnet *usbdev = netdev_priv(dev);
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);

    if (test_bit(WORK_SET_MULTICAST_LIST, &priv->work_pending))
        return;

    set_bit(WORK_SET_MULTICAST_LIST, &priv->work_pending);
    queue_work(priv->workqueue, &priv->work);
}

static void rndis_wlan_auth_indication(struct usbnet *usbdev,
                struct ndis_80211_status_indication *indication,
                int len)
{
    u8 *buf;
    const char *type;
    int flags, buflen, key_id;
    bool pairwise_error, group_error;
    struct ndis_80211_auth_request *auth_req;
    enum nl80211_key_type key_type;

    /* must have at least one array entry */
    if (len < offsetof(struct ndis_80211_status_indication, u) +
                sizeof(struct ndis_80211_auth_request)) {
        netdev_info(usbdev->net, "authentication indication: too short message (%i)\n",
                len);
        return;
    }

    buf = (void *)&indication->u.auth_request[0];
    buflen = len - offsetof(struct ndis_80211_status_indication, u);

    while (buflen >= sizeof(*auth_req)) {
        auth_req = (void *)buf;
        type = "unknown";
        flags = le32_to_cpu(auth_req->flags);
        pairwise_error = false;
        group_error = false;

        if (flags & 0x1)
            type = "reauth request";
        if (flags & 0x2)
            type = "key update request";
        if (flags & 0x6) {
            pairwise_error = true;
            type = "pairwise_error";
        }
        if (flags & 0xe) {
            group_error = true;
            type = "group_error";
        }

        netdev_info(usbdev->net, "authentication indication: %s (0x%08x)\n",
                type, le32_to_cpu(auth_req->flags));

        if (pairwise_error) {
            key_type = NL80211_KEYTYPE_PAIRWISE;
            key_id = -1;

            cfg80211_michael_mic_failure(usbdev->net,
                            auth_req->bssid,
                            key_type, key_id, NULL,
                            GFP_KERNEL);
        }

        if (group_error) {
            key_type = NL80211_KEYTYPE_GROUP;
            key_id = -1;

            cfg80211_michael_mic_failure(usbdev->net,
                            auth_req->bssid,
                            key_type, key_id, NULL,
                            GFP_KERNEL);
        }

        buflen -= le32_to_cpu(auth_req->length);
        buf += le32_to_cpu(auth_req->length);
    }
}

static void rndis_wlan_pmkid_cand_list_indication(struct usbnet *usbdev,
                struct ndis_80211_status_indication *indication,
                int len)
{
    struct ndis_80211_pmkid_cand_list *cand_list;
    int list_len, expected_len, i;

    if (len < offsetof(struct ndis_80211_status_indication, u) +
                sizeof(struct ndis_80211_pmkid_cand_list)) {
        netdev_info(usbdev->net, "pmkid candidate list indication: too short message (%i)\n",
                len);
        return;
    }

    list_len = le32_to_cpu(indication->u.cand_list.num_candidates) *
            sizeof(struct ndis_80211_pmkid_candidate);
    expected_len = sizeof(struct ndis_80211_pmkid_cand_list) + list_len +
            offsetof(struct ndis_80211_status_indication, u);

    if (len < expected_len) {
        netdev_info(usbdev->net, "pmkid candidate list indication: list larger than buffer (%i < %i)\n",
                len, expected_len);
        return;
    }

    cand_list = &indication->u.cand_list;

    netdev_info(usbdev->net, "pmkid candidate list indication: version %i, candidates %i\n",
            le32_to_cpu(cand_list->version),
            le32_to_cpu(cand_list->num_candidates));

    if (le32_to_cpu(cand_list->version) != 1)
        return;

    for (i = 0; i < le32_to_cpu(cand_list->num_candidates); i++) {
        struct ndis_80211_pmkid_candidate *cand =
                        &cand_list->candidate_list[i];
        bool preauth = !!(cand->flags & NDIS_80211_PMKID_CAND_PREAUTH);

        netdev_dbg(usbdev->net, "cand[%i]: flags: 0x%08x, preauth: %d, bssid: %pM\n",
               i, le32_to_cpu(cand->flags), preauth, cand->bssid);

        cfg80211_pmksa_candidate_notify(usbdev->net, i, cand->bssid,
                        preauth, GFP_ATOMIC);
    }
}

static void rndis_wlan_media_specific_indication(struct usbnet *usbdev,
            struct rndis_indicate *msg, int buflen)
{
    struct ndis_80211_status_indication *indication;
    unsigned int len, offset;

    offset = offsetof(struct rndis_indicate, status) +
            le32_to_cpu(msg->offset);
    len = le32_to_cpu(msg->length);

    if (len < 8) {
        netdev_info(usbdev->net, "media specific indication, ignore too short message (%i < 8)\n",
                len);
        return;
    }

    if (len > buflen || offset > buflen || offset + len > buflen) {
        netdev_info(usbdev->net, "media specific indication, too large to fit to buffer (%i > %i)\n",
                offset + len, buflen);
        return;
    }

    indication = (void *)((u8 *)msg + offset);

    switch (le32_to_cpu(indication->status_type)) {
    case NDIS_80211_STATUSTYPE_RADIOSTATE:
        netdev_info(usbdev->net, "radio state indication: %i\n",
                le32_to_cpu(indication->u.radio_status));
        return;

    case NDIS_80211_STATUSTYPE_MEDIASTREAMMODE:
        netdev_info(usbdev->net, "media stream mode indication: %i\n",
                le32_to_cpu(indication->u.media_stream_mode));
        return;

    case NDIS_80211_STATUSTYPE_AUTHENTICATION:
        rndis_wlan_auth_indication(usbdev, indication, len);
        return;

    case NDIS_80211_STATUSTYPE_PMKID_CANDIDATELIST:
        rndis_wlan_pmkid_cand_list_indication(usbdev, indication, len);
        return;

    default:
        netdev_info(usbdev->net, "media specific indication: unknown status type 0x%08x\n",
                le32_to_cpu(indication->status_type));
    }
}

static void rndis_wlan_indication(struct usbnet *usbdev, void *ind, int buflen)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    struct rndis_indicate *msg = ind;

    switch (le32_to_cpu(msg->status)) {
    case RNDIS_STATUS_MEDIA_CONNECT:
        if (priv->current_command_oid == RNDIS_OID_802_11_ADD_KEY) {
            /* RNDIS_OID_802_11_ADD_KEY causes sometimes extra
             * "media connect" indications which confuses driver
             * and userspace to think that device is
             * roaming/reassociating when it isn't.
             */
            netdev_dbg(usbdev->net, "ignored RNDIS_OID_802_11_ADD_KEY triggered 'media connect'\n");
            return;
        }

        usbnet_pause_rx(usbdev);

        netdev_info(usbdev->net, "media connect\n");

        /* queue work to avoid recursive calls into rndis_command */
        set_bit(WORK_LINK_UP, &priv->work_pending);
        queue_work(priv->workqueue, &priv->work);
        break;

    case RNDIS_STATUS_MEDIA_DISCONNECT:
        netdev_info(usbdev->net, "media disconnect\n");

        /* queue work to avoid recursive calls into rndis_command */
        set_bit(WORK_LINK_DOWN, &priv->work_pending);
        queue_work(priv->workqueue, &priv->work);
        break;

    case RNDIS_STATUS_MEDIA_SPECIFIC_INDICATION:
        rndis_wlan_media_specific_indication(usbdev, msg, buflen);
        break;

    default:
        netdev_info(usbdev->net, "indication: 0x%08x\n",
                le32_to_cpu(msg->status));
        break;
    }
}

static int rndis_wlan_get_caps(struct usbnet *usbdev, struct wiphy *wiphy)
{
    struct {
        __le32  num_items;
        __le32  items[8];
    } networks_supported;
    struct ndis_80211_capability *caps;
    u8 caps_buf[sizeof(*caps) + sizeof(caps->auth_encr_pair) * 16];
    int len, retval, i, n;
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);

    /* determine supported modes */
    len = sizeof(networks_supported);
    retval = rndis_query_oid(usbdev,
                 RNDIS_OID_802_11_NETWORK_TYPES_SUPPORTED,
                 &networks_supported, &len);
    if (retval >= 0) {
        n = le32_to_cpu(networks_supported.num_items);
        if (n > 8)
            n = 8;
        for (i = 0; i < n; i++) {
            switch (le32_to_cpu(networks_supported.items[i])) {
            case NDIS_80211_TYPE_FREQ_HOP:
            case NDIS_80211_TYPE_DIRECT_SEQ:
                priv->caps |= CAP_MODE_80211B;
                break;
            case NDIS_80211_TYPE_OFDM_A:
                priv->caps |= CAP_MODE_80211A;
                break;
            case NDIS_80211_TYPE_OFDM_G:
                priv->caps |= CAP_MODE_80211G;
                break;
            }
        }
    }

    /* get device 802.11 capabilities, number of PMKIDs */
    caps = (struct ndis_80211_capability *)caps_buf;
    len = sizeof(caps_buf);
    retval = rndis_query_oid(usbdev,
                 RNDIS_OID_802_11_CAPABILITY,
                 caps, &len);
    if (retval >= 0) {
        netdev_dbg(usbdev->net, "RNDIS_OID_802_11_CAPABILITY -> len %d, "
                "ver %d, pmkids %d, auth-encr-pairs %d\n",
                le32_to_cpu(caps->length),
                le32_to_cpu(caps->version),
                le32_to_cpu(caps->num_pmkids),
                le32_to_cpu(caps->num_auth_encr_pair));
        wiphy->max_num_pmkids = le32_to_cpu(caps->num_pmkids);
    } else
        wiphy->max_num_pmkids = 0;

    return retval;
}

static void rndis_do_cqm(struct usbnet *usbdev, s32 rssi)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    enum nl80211_cqm_rssi_threshold_event event;
    int thold, hyst, last_event;

    if (priv->cqm_rssi_thold >= 0 || rssi >= 0)
        return;
    if (priv->infra_mode != NDIS_80211_INFRA_INFRA)
        return;

    last_event = priv->last_cqm_event_rssi;
    thold = priv->cqm_rssi_thold;
    hyst = priv->cqm_rssi_hyst;

    if (rssi < thold && (last_event == 0 || rssi < last_event - hyst))
        event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
    else if (rssi > thold && (last_event == 0 || rssi > last_event + hyst))
        event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
    else
        return;

    priv->last_cqm_event_rssi = rssi;
    cfg80211_cqm_rssi_notify(usbdev->net, event, GFP_KERNEL);
}

#define DEVICE_POLLER_JIFFIES (HZ)
static void rndis_device_poller(struct work_struct *work)
{
    struct rndis_wlan_private *priv =
        container_of(work, struct rndis_wlan_private,
                            dev_poller_work.work);
    struct usbnet *usbdev = priv->usbdev;
    __le32 rssi, tmp;
    int len, ret, j;
    int update_jiffies = DEVICE_POLLER_JIFFIES;
    void *buf;

    /* Only check/do workaround when connected. Calling is_associated()
     * also polls device with rndis_command() and catches for media link
     * indications.
     */
    if (!is_associated(usbdev)) {
        /* Workaround bad scanning in BCM4320a devices with active
         * background scanning when not associated.
         */
        if (priv->device_type == RNDIS_BCM4320A && priv->radio_on &&
            !priv->scan_request) {
            /* Get previous scan results */
            rndis_check_bssid_list(usbdev, NULL, NULL);

            /* Initiate new scan */
            rndis_start_bssid_list_scan(usbdev);
        }

        goto end;
    }

    len = sizeof(rssi);
    ret = rndis_query_oid(usbdev, RNDIS_OID_802_11_RSSI,
                  &rssi, &len);
    if (ret == 0) {
        priv->last_qual = level_to_qual(le32_to_cpu(rssi));
        rndis_do_cqm(usbdev, le32_to_cpu(rssi));
    }

    netdev_dbg(usbdev->net, "dev-poller: RNDIS_OID_802_11_RSSI -> %d, rssi:%d, qual: %d\n",
           ret, le32_to_cpu(rssi), level_to_qual(le32_to_cpu(rssi)));

    /* Workaround transfer stalls on poor quality links.
     * TODO: find right way to fix these stalls (as stalls do not happen
     * with ndiswrapper/windows driver). */
    if (priv->param_workaround_interval > 0 && priv->last_qual <= 25) {
        /* Decrease stats worker interval to catch stalls.
         * faster. Faster than 400-500ms causes packet loss,
         * Slower doesn't catch stalls fast enough.
         */
        j = msecs_to_jiffies(priv->param_workaround_interval);
        if (j > DEVICE_POLLER_JIFFIES)
            j = DEVICE_POLLER_JIFFIES;
        else if (j <= 0)
            j = 1;
        update_jiffies = j;

        /* Send scan OID. Use of both OIDs is required to get device
         * working.
         */
        tmp = cpu_to_le32(1);
        rndis_set_oid(usbdev,
                  RNDIS_OID_802_11_BSSID_LIST_SCAN,
                  &tmp, sizeof(tmp));

        len = CONTROL_BUFFER_SIZE;
        buf = kmalloc(len, GFP_KERNEL);
        if (!buf)
            goto end;

        rndis_query_oid(usbdev,
                RNDIS_OID_802_11_BSSID_LIST,
                buf, &len);
        kfree(buf);
    }

end:
    if (update_jiffies >= HZ)
        update_jiffies = round_jiffies_relative(update_jiffies);
    else {
        j = round_jiffies_relative(update_jiffies);
        if (abs(j - update_jiffies) <= 10)
            update_jiffies = j;
    }

    queue_delayed_work(priv->workqueue, &priv->dev_poller_work,
                                update_jiffies);
}

/*
 * driver/device initialization
 */
static void rndis_copy_module_params(struct usbnet *usbdev, int device_type)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);

    priv->device_type = device_type;

    priv->param_country[0] = modparam_country[0];
    priv->param_country[1] = modparam_country[1];
    priv->param_country[2] = 0;
    priv->param_frameburst   = modparam_frameburst;
    priv->param_afterburner  = modparam_afterburner;
    priv->param_power_save   = modparam_power_save;
    priv->param_power_output = modparam_power_output;
    priv->param_roamtrigger  = modparam_roamtrigger;
    priv->param_roamdelta    = modparam_roamdelta;

    priv->param_country[0] = toupper(priv->param_country[0]);
    priv->param_country[1] = toupper(priv->param_country[1]);
    /* doesn't support EU as country code, use FI instead */
    if (!strcmp(priv->param_country, "EU"))
        strcpy(priv->param_country, "FI");

    if (priv->param_power_save < 0)
        priv->param_power_save = 0;
    else if (priv->param_power_save > 2)
        priv->param_power_save = 2;

    if (priv->param_power_output < 0)
        priv->param_power_output = 0;
    else if (priv->param_power_output > 3)
        priv->param_power_output = 3;

    if (priv->param_roamtrigger < -80)
        priv->param_roamtrigger = -80;
    else if (priv->param_roamtrigger > -60)
        priv->param_roamtrigger = -60;

    if (priv->param_roamdelta < 0)
        priv->param_roamdelta = 0;
    else if (priv->param_roamdelta > 2)
        priv->param_roamdelta = 2;

    if (modparam_workaround_interval < 0)
        priv->param_workaround_interval = 500;
    else
        priv->param_workaround_interval = modparam_workaround_interval;
}

static int unknown_early_init(struct usbnet *usbdev)
{
    /* copy module parameters for unknown so that iwconfig reports txpower
     * and workaround parameter is copied to private structure correctly.
     */
    rndis_copy_module_params(usbdev, RNDIS_UNKNOWN);

    /* This is unknown device, so do not try set configuration parameters.
     */

    return 0;
}

static int bcm4320a_early_init(struct usbnet *usbdev)
{
    /* copy module parameters for bcm4320a so that iwconfig reports txpower
     * and workaround parameter is copied to private structure correctly.
     */
    rndis_copy_module_params(usbdev, RNDIS_BCM4320A);

    /* bcm4320a doesn't handle configuration parameters well. Try
     * set any and you get partially zeroed mac and broken device.
     */

    return 0;
}

static int bcm4320b_early_init(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    char buf[8];

    rndis_copy_module_params(usbdev, RNDIS_BCM4320B);

    /* Early initialization settings, setting these won't have effect
     * if called after generic_rndis_bind().
     */

    rndis_set_config_parameter_str(usbdev, "Country", priv->param_country);
    rndis_set_config_parameter_str(usbdev, "FrameBursting",
                    priv->param_frameburst ? "1" : "0");
    rndis_set_config_parameter_str(usbdev, "Afterburner",
                    priv->param_afterburner ? "1" : "0");
    sprintf(buf, "%d", priv->param_power_save);
    rndis_set_config_parameter_str(usbdev, "PowerSaveMode", buf);
    sprintf(buf, "%d", priv->param_power_output);
    rndis_set_config_parameter_str(usbdev, "PwrOut", buf);
    sprintf(buf, "%d", priv->param_roamtrigger);
    rndis_set_config_parameter_str(usbdev, "RoamTrigger", buf);
    sprintf(buf, "%d", priv->param_roamdelta);
    rndis_set_config_parameter_str(usbdev, "RoamDelta", buf);

    return 0;
}

/* same as rndis_netdev_ops but with local multicast handler */
static const struct net_device_ops rndis_wlan_netdev_ops = {
    .ndo_open       = usbnet_open,
    .ndo_stop       = usbnet_stop,
    .ndo_start_xmit     = usbnet_start_xmit,
    .ndo_tx_timeout     = usbnet_tx_timeout,
    .ndo_set_mac_address    = eth_mac_addr,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_set_rx_mode    = rndis_wlan_set_multicast_list,
};

static int rndis_wlan_bind(struct usbnet *usbdev, struct usb_interface *intf)
{
    struct wiphy *wiphy;
    struct rndis_wlan_private *priv;
    int retval, len;
    __le32 tmp;

    /* allocate wiphy and rndis private data
     * NOTE: We only support a single virtual interface, so wiphy
     * and wireless_dev are somewhat synonymous for this device.
     */
    wiphy = wiphy_new(&rndis_config_ops, sizeof(struct rndis_wlan_private));
    if (!wiphy)
        return -ENOMEM;

    priv = wiphy_priv(wiphy);
    usbdev->net->ieee80211_ptr = &priv->wdev;
    priv->wdev.wiphy = wiphy;
    priv->wdev.iftype = NL80211_IFTYPE_STATION;

    /* These have to be initialized before calling generic_rndis_bind().
     * Otherwise we'll be in big trouble in rndis_wlan_early_init().
     */
    usbdev->driver_priv = priv;
    priv->usbdev = usbdev;

    mutex_init(&priv->command_lock);

    /* because rndis_command() sleeps we need to use workqueue */
    priv->workqueue = create_singlethread_workqueue("rndis_wlan");
    INIT_WORK(&priv->work, rndis_wlan_worker);
    INIT_DELAYED_WORK(&priv->dev_poller_work, rndis_device_poller);
    INIT_DELAYED_WORK(&priv->scan_work, rndis_get_scan_results);

    /* try bind rndis_host */
    retval = generic_rndis_bind(usbdev, intf, FLAG_RNDIS_PHYM_WIRELESS);
    if (retval < 0)
        goto fail;

    /* generic_rndis_bind set packet filter to multicast_all+
     * promisc mode which doesn't work well for our devices (device
     * picks up rssi to closest station instead of to access point).
     *
     * rndis_host wants to avoid all OID as much as possible
     * so do promisc/multicast handling in rndis_wlan.
     */
    usbdev->net->netdev_ops = &rndis_wlan_netdev_ops;

    tmp = cpu_to_le32(RNDIS_PACKET_TYPE_DIRECTED | RNDIS_PACKET_TYPE_BROADCAST);
    retval = rndis_set_oid(usbdev,
                   RNDIS_OID_GEN_CURRENT_PACKET_FILTER,
                   &tmp, sizeof(tmp));

    len = sizeof(tmp);
    retval = rndis_query_oid(usbdev,
                 RNDIS_OID_802_3_MAXIMUM_LIST_SIZE,
                 &tmp, &len);
    priv->multicast_size = le32_to_cpu(tmp);
    if (retval < 0 || priv->multicast_size < 0)
        priv->multicast_size = 0;
    if (priv->multicast_size > 0)
        usbdev->net->flags |= IFF_MULTICAST;
    else
        usbdev->net->flags &= ~IFF_MULTICAST;

    /* fill-out wiphy structure and register w/ cfg80211 */
    memcpy(wiphy->perm_addr, usbdev->net->dev_addr, ETH_ALEN);
    wiphy->privid = rndis_wiphy_privid;
    wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION)
                    | BIT(NL80211_IFTYPE_ADHOC);
    wiphy->max_scan_ssids = 1;

    /* TODO: fill-out band/encr information based on priv->caps */
    rndis_wlan_get_caps(usbdev, wiphy);

    memcpy(priv->channels, rndis_channels, sizeof(rndis_channels));
    memcpy(priv->rates, rndis_rates, sizeof(rndis_rates));
    priv->band.channels = priv->channels;
    priv->band.n_channels = ARRAY_SIZE(rndis_channels);
    priv->band.bitrates = priv->rates;
    priv->band.n_bitrates = ARRAY_SIZE(rndis_rates);
    wiphy->bands[IEEE80211_BAND_2GHZ] = &priv->band;
    wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;

    memcpy(priv->cipher_suites, rndis_cipher_suites,
                        sizeof(rndis_cipher_suites));
    wiphy->cipher_suites = priv->cipher_suites;
    wiphy->n_cipher_suites = ARRAY_SIZE(rndis_cipher_suites);

    set_wiphy_dev(wiphy, &usbdev->udev->dev);

    if (wiphy_register(wiphy)) {
        retval = -ENODEV;
        goto fail;
    }

    set_default_iw_params(usbdev);

    priv->power_mode = -1;

    /* set default rts/frag */
    rndis_set_wiphy_params(wiphy,
            WIPHY_PARAM_FRAG_THRESHOLD | WIPHY_PARAM_RTS_THRESHOLD);

    /* turn radio off on init */
    priv->radio_on = false;
    disassociate(usbdev, false);
    netif_carrier_off(usbdev->net);

    return 0;

fail:
    cancel_delayed_work_sync(&priv->dev_poller_work);
    cancel_delayed_work_sync(&priv->scan_work);
    cancel_work_sync(&priv->work);
    flush_workqueue(priv->workqueue);
    destroy_workqueue(priv->workqueue);

    wiphy_free(wiphy);
    return retval;
}

static void rndis_wlan_unbind(struct usbnet *usbdev, struct usb_interface *intf)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);

    /* turn radio off */
    disassociate(usbdev, false);

    cancel_delayed_work_sync(&priv->dev_poller_work);
    cancel_delayed_work_sync(&priv->scan_work);
    cancel_work_sync(&priv->work);
    flush_workqueue(priv->workqueue);
    destroy_workqueue(priv->workqueue);

    rndis_unbind(usbdev, intf);

    wiphy_unregister(priv->wdev.wiphy);
    wiphy_free(priv->wdev.wiphy);
}

static int rndis_wlan_reset(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    int retval;

    netdev_dbg(usbdev->net, "%s()\n", __func__);

    retval = rndis_reset(usbdev);
    if (retval)
        netdev_warn(usbdev->net, "rndis_reset failed: %d\n", retval);

    /* rndis_reset cleared multicast list, so restore here.
       (set_multicast_list() also turns on current packet filter) */
    set_multicast_list(usbdev);

    queue_delayed_work(priv->workqueue, &priv->dev_poller_work,
        round_jiffies_relative(DEVICE_POLLER_JIFFIES));

    return deauthenticate(usbdev);
}

static int rndis_wlan_stop(struct usbnet *usbdev)
{
    struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
    int retval;
    __le32 filter;

    netdev_dbg(usbdev->net, "%s()\n", __func__);

    retval = disassociate(usbdev, false);

    priv->work_pending = 0;
    cancel_delayed_work_sync(&priv->dev_poller_work);
    cancel_delayed_work_sync(&priv->scan_work);
    cancel_work_sync(&priv->work);
    flush_workqueue(priv->workqueue);

    if (priv->scan_request) {
        cfg80211_scan_done(priv->scan_request, true);
        priv->scan_request = NULL;
    }

    /* Set current packet filter zero to block receiving data packets from
       device. */
    filter = 0;
    rndis_set_oid(usbdev, RNDIS_OID_GEN_CURRENT_PACKET_FILTER, &filter,
                                sizeof(filter));

    return retval;
}

static const struct driver_info bcm4320b_info = {
    .description =  "Wireless RNDIS device, BCM4320b based",
    .flags =    FLAG_WLAN | FLAG_FRAMING_RN | FLAG_NO_SETINT |
                FLAG_AVOID_UNLINK_URBS,
    .bind =     rndis_wlan_bind,
    .unbind =   rndis_wlan_unbind,
    .status =   rndis_status,
    .rx_fixup = rndis_rx_fixup,
    .tx_fixup = rndis_tx_fixup,
    .reset =    rndis_wlan_reset,
    .stop =     rndis_wlan_stop,
    .early_init =   bcm4320b_early_init,
    .indication =   rndis_wlan_indication,
};

static const struct driver_info bcm4320a_info = {
    .description =  "Wireless RNDIS device, BCM4320a based",
    .flags =    FLAG_WLAN | FLAG_FRAMING_RN | FLAG_NO_SETINT |
                FLAG_AVOID_UNLINK_URBS,
    .bind =     rndis_wlan_bind,
    .unbind =   rndis_wlan_unbind,
    .status =   rndis_status,
    .rx_fixup = rndis_rx_fixup,
    .tx_fixup = rndis_tx_fixup,
    .reset =    rndis_wlan_reset,
    .stop =     rndis_wlan_stop,
    .early_init =   bcm4320a_early_init,
    .indication =   rndis_wlan_indication,
};

static const struct driver_info rndis_wlan_info = {
    .description =  "Wireless RNDIS device",
    .flags =    FLAG_WLAN | FLAG_FRAMING_RN | FLAG_NO_SETINT |
                FLAG_AVOID_UNLINK_URBS,
    .bind =     rndis_wlan_bind,
    .unbind =   rndis_wlan_unbind,
    .status =   rndis_status,
    .rx_fixup = rndis_rx_fixup,
    .tx_fixup = rndis_tx_fixup,
    .reset =    rndis_wlan_reset,
    .stop =     rndis_wlan_stop,
    .early_init =   unknown_early_init,
    .indication =   rndis_wlan_indication,
};

/*-------------------------------------------------------------------------*/

static const struct usb_device_id products [] = {
#define RNDIS_MASTER_INTERFACE \
    .bInterfaceClass    = USB_CLASS_COMM, \
    .bInterfaceSubClass = 2 /* ACM */, \
    .bInterfaceProtocol = 0x0ff

/* INF driver for these devices have DriverVer >= 4.xx.xx.xx and many custom
 * parameters available. Chipset marked as 'BCM4320SKFBG' in NDISwrapper-wiki.
 */
{
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x0411,
    .idProduct      = 0x00bc,   /* Buffalo WLI-U2-KG125S */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320b_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x0baf,
    .idProduct      = 0x011b,   /* U.S. Robotics USR5421 */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320b_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x050d,
    .idProduct      = 0x011b,   /* Belkin F5D7051 */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320b_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x1799,   /* Belkin has two vendor ids */
    .idProduct      = 0x011b,   /* Belkin F5D7051 */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320b_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x13b1,
    .idProduct      = 0x0014,   /* Linksys WUSB54GSv2 */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320b_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x13b1,
    .idProduct      = 0x0026,   /* Linksys WUSB54GSC */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320b_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x0b05,
    .idProduct      = 0x1717,   /* Asus WL169gE */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320b_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x0a5c,
    .idProduct      = 0xd11b,   /* Eminent EM4045 */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320b_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x1690,
    .idProduct      = 0x0715,   /* BT Voyager 1055 */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320b_info,
},
/* These devices have DriverVer < 4.xx.xx.xx and do not have any custom
 * parameters available, hardware probably contain older firmware version with
 * no way of updating. Chipset marked as 'BCM4320????' in NDISwrapper-wiki.
 */
{
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x13b1,
    .idProduct      = 0x000e,   /* Linksys WUSB54GSv1 */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320a_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x0baf,
    .idProduct      = 0x0111,   /* U.S. Robotics USR5420 */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320a_info,
}, {
    .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
              | USB_DEVICE_ID_MATCH_DEVICE,
    .idVendor       = 0x0411,
    .idProduct      = 0x004b,   /* BUFFALO WLI-USB-G54 */
    RNDIS_MASTER_INTERFACE,
    .driver_info        = (unsigned long) &bcm4320a_info,
},
/* Generic Wireless RNDIS devices that we don't have exact
 * idVendor/idProduct/chip yet.
 */
{
    /* RNDIS is MSFT's un-official variant of CDC ACM */
    USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
    .driver_info = (unsigned long) &rndis_wlan_info,
}, {
    /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */
    USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
    .driver_info = (unsigned long) &rndis_wlan_info,
},
    { },        // END
};
MODULE_DEVICE_TABLE(usb, products);

static struct usb_driver rndis_wlan_driver = {
    .name =     "rndis_wlan",
    .id_table = products,
    .probe =    usbnet_probe,
    .disconnect =   usbnet_disconnect,
    .suspend =  usbnet_suspend,
    .resume =   usbnet_resume,
    .disable_hub_initiated_lpm = 1,
};

module_usb_driver(rndis_wlan_driver);

MODULE_AUTHOR("Bjorge Dijkstra");
MODULE_AUTHOR("Jussi Kivilinna");
MODULE_DESCRIPTION("Driver for RNDIS based USB Wireless adapters");
MODULE_LICENSE("GPL");